/*
  FDE learning site, direction A「和主站一体」(Owner 10-31). Loaded after tokens.css and ui.css.
  Covers the app pages (course home, exams, question bank, records, account), the lesson reader
  (lesson body styles live here so the lesson HTML stays byte-identical), login, the free self-test
  and the error pages. Light only, like apiget.store. Only --c-* / --ag-* tokens.
*/

/* ---------- Names the snapshot's own styles still read (free self-test, inline styles) ---------- */
:root {
  --ink: var(--c-text);
  --muted: var(--c-text-3);
  --line: var(--c-line);
  --paper: var(--c-surface);
  --bg: var(--c-page);
  --accent: var(--c-accent);
  --accent-soft: var(--c-accent-soft);
  --deep: var(--c-deep);
  --red: var(--c-bad);
  --green: var(--c-good);
  --orange: var(--c-warn);
}
.chip-warn { background: var(--ag-gold-50); color: var(--c-gold-text); }

/* ---------- Page frame ---------- */
.app { padding-block: 8px 80px; min-height: 60vh; outline: none; }
.app > * + * { margin-top: 0; }
.page-head { display: flex; align-items: end; justify-content: space-between; gap: 16px 24px; flex-wrap: wrap; padding-block: 48px 32px; }
.page-head .t-lead { max-width: 40em; }
.section-head .t-lead { margin-top: 2px; }
.boot-loading { min-height: 52vh; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px; color: var(--c-text-3); font-size: var(--ag-text-small); }
.boot-spinner { width: 28px; height: 28px; border-radius: 50%; border: 3px solid var(--c-line); border-top-color: var(--c-accent); animation: boot-spin 0.8s linear infinite; }
@keyframes boot-spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .boot-spinner { animation-duration: 3s; } }
.boot-error[hidden] { display: none; }
.note { font-size: var(--ag-text-small); line-height: var(--ag-leading-small); color: var(--c-text-3); }
.note.ok { color: var(--c-good); }
.note.err { color: var(--c-bad); }
.empty { padding: 24px; color: var(--c-text-3); text-align: center; }

/* Older markup still uses .primary / .secondary / .quiet on plain buttons and links. */
:where(a, button, label).primary:not(.btn), :where(a, button, label).secondary:not(.btn), :where(a, button, label).quiet:not(.btn) {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 40px; padding: 0 16px;
  border: 0; border-radius: var(--ag-radius-sm); font: 600 var(--ag-text-small)/1 var(--ag-font-sans); white-space: nowrap; cursor: pointer; text-decoration: none;
  transition: background-color var(--ag-dur) var(--ag-ease-out), box-shadow var(--ag-dur) var(--ag-ease-out);
}
:where(a, button, label).primary:not(.btn) { background: var(--c-btn); color: var(--c-btn-text); box-shadow: 0 1px 2px rgb(11 61 46 / 0.24); }
:where(a, button, label).primary:not(.btn):hover { background: var(--c-btn-hover); }
:where(a, button, label).secondary:not(.btn) { background: var(--c-surface); color: var(--c-text); box-shadow: inset 0 0 0 1px var(--c-line-strong); }
:where(a, button, label).secondary:not(.btn):hover { box-shadow: inset 0 0 0 1px var(--c-icon-weak), var(--ag-shadow-1); }
:where(a, button, label).quiet:not(.btn) { background: transparent; color: var(--c-accent); padding: 0 10px; }
:where(a, button, label).quiet:not(.btn):hover { background: var(--c-tint); }
.btn:disabled, :where(a, button).primary:disabled, :where(a, button).secondary:disabled, :where(a, button).quiet:disabled, .rbar-btn:disabled, .icon-btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; box-shadow: none; }
.btn-primary:disabled:hover { background: var(--c-btn); }
.actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.badge { display: inline-flex; align-items: center; height: 24px; padding: 0 8px; border-radius: var(--ag-radius-xs); background: var(--c-muted); color: var(--c-text-2); font-size: var(--ag-text-caption); font-weight: 600; white-space: nowrap; }
.badge.pass { background: var(--c-good-soft); color: var(--c-good); }
.badge.fail { background: var(--c-bad-soft); color: var(--c-bad); }
.panel { background: var(--c-surface); border-radius: var(--ag-radius-md); box-shadow: var(--c-raised); padding: 24px; }
.panel + .panel, .panel + section, section + .panel { margin-top: 16px; }
.panel h2 { font-size: var(--ag-text-title); line-height: var(--ag-leading-title); font-weight: 650; margin-bottom: 12px; }
.page-heading { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-block: 40px 24px; }
.page-heading:has(> .icon-back) { flex-direction: row-reverse; justify-content: flex-end; gap: 8px; }
.page-heading > .icon-back { margin-left: -10px; }
.page-heading h1, .intro h1 { font-family: var(--ag-font-display); font-weight: 600; font-synthesis-weight: none; font-size: var(--ag-text-display-2); line-height: var(--ag-leading-display-2); }
.page-heading .note { margin-top: 6px; }
.intro { padding-block: 40px 20px; }
.section-line { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 28px 0 12px; }
.section-line h2 { font-size: var(--ag-text-title); font-weight: 650; }
.section-head-row .t-heading { font-size: var(--ag-text-heading); }
.sr-only { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
input, select, textarea { font: inherit; color: inherit; }
select, input[type='text'], input[type='search'], input[type='number'], input[type='password'], input:not([type]), textarea {
  min-height: 40px; padding: 0 12px; border: 0; border-radius: var(--ag-radius-sm); background: var(--c-surface);
  box-shadow: inset 0 0 0 1px var(--c-line-strong); font-size: var(--ag-text-small); color: var(--c-text);
}
textarea { padding: 10px 12px; line-height: 1.7; }
select { padding-right: 8px; cursor: pointer; }
:where(input, select, textarea):focus-visible { outline: var(--ag-focus-width) solid var(--ag-focus-color); outline-offset: 1px; }
input[type='checkbox'], input[type='radio'] { accent-color: var(--c-btn); width: 16px; height: 16px; }

/* Toast, sync line, dialogs */
#toast { position: fixed; left: 50%; bottom: 32px; z-index: 60; transform: translate(-50%, 16px); opacity: 0; pointer-events: none; max-width: calc(100% - 32px);
  padding: 12px 18px; border-radius: var(--ag-radius-sm); background: var(--c-text); color: var(--c-page); font-size: var(--ag-text-small); font-weight: 600; box-shadow: var(--c-overlay);
  transition: opacity var(--ag-dur) var(--ag-ease-out), transform var(--ag-dur) var(--ag-ease-out); }
#toast.show { opacity: 1; transform: translate(-50%, 0); }
.sync-status { position: fixed; left: 50%; top: calc(var(--hd-height) + 12px); z-index: 35; transform: translateX(-50%); max-width: calc(100% - 32px);
  padding: 10px 16px; border-radius: var(--ag-radius-sm); background: var(--ag-gold-50); color: var(--c-gold-text); box-shadow: var(--c-floating); font-size: var(--ag-text-small); }
.sync-status[hidden] { display: none; }
dialog { border: 0; padding: 0; color: var(--c-text); background: var(--c-surface); border-radius: var(--ag-radius-lg); box-shadow: var(--c-overlay); }
dialog::backdrop { background: var(--c-scrim); }
#confirm { width: min(440px, calc(100% - 32px)); }
#confirm form { padding: 28px; display: grid; gap: 10px; }
#confirm h2 { font-size: var(--ag-text-title); line-height: var(--ag-leading-title); font-weight: 650; }
#confirm p { color: var(--c-text-2); }
#confirm .actions { justify-content: flex-end; margin-top: 12px; }
.update-notice { width: min(520px, calc(100% - 32px)); max-height: calc(100dvh - 32px); overflow: auto; padding: 28px; }
.notice-header { display: flex; align-items: start; justify-content: space-between; gap: 18px; }
.notice-header h2 { font-size: var(--ag-text-title); line-height: var(--ag-leading-title); font-weight: 650; }
.notice-close { flex: none; width: 40px; height: 40px; display: grid; place-items: center; border: 0; border-radius: var(--ag-radius-sm); background: transparent; color: var(--c-text-3); font-size: 24px; line-height: 1; cursor: pointer; }
.notice-close:hover { background: var(--c-muted); color: var(--c-text); }
.notice-date { display: block; margin-top: 4px; color: var(--c-text-3); font-size: var(--ag-text-caption); }
.notice-list { display: grid; gap: 18px; margin-top: 20px; }
.notice-item h3 { font-size: var(--ag-text-body); font-weight: 650; margin-bottom: 4px; }
.notice-item p { color: var(--c-text-2); font-size: var(--ag-text-small); line-height: var(--ag-leading-small); }
.notice-footer { display: flex; justify-content: flex-end; margin-top: 24px; }

/* Empty and error states */
.empty-state { display: grid; justify-items: center; gap: 8px; padding: 48px 24px; text-align: center; background: var(--c-surface); border-radius: var(--ag-radius-md); box-shadow: var(--c-raised); margin-top: 16px; }
.empty-icon { width: 48px; height: 48px; border-radius: 12px; display: grid; place-items: center; background: var(--c-tint); color: var(--c-accent); }
.empty-icon svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 1.75; stroke-linecap: round; stroke-linejoin: round; }
.empty-state h2 { font-size: var(--ag-text-title); line-height: var(--ag-leading-title); font-weight: 650; margin-top: 4px; }
.empty-state p { color: var(--c-text-3); font-size: var(--ag-text-small); }
.empty-actions { margin-top: 8px; display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; }
.error-main { display: grid; place-items: center; padding-block: 64px 96px; }
.error-card { display: grid; gap: 14px; justify-items: start; width: 100%; max-width: 560px; padding: 36px; background: var(--c-surface); border-radius: var(--ag-radius-md); box-shadow: var(--c-raised); }
.app .error-card { margin: 64px auto; }
.error-card .cta-actions { margin-top: 8px; }

/* Header: 「我的」 and the tab bar follow the app route */
.account[aria-current='page'] { background: var(--c-accent-soft); color: var(--c-accent); box-shadow: inset 0 0 0 1px var(--c-accent-ring); }
.hd .nav[aria-hidden='true'] { flex: 1; }
.tabbar { display: none; position: fixed; left: 0; right: 0; bottom: 0; z-index: 25; background: var(--c-header); -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); border-top: 1px solid var(--c-line); padding: 4px 4px calc(4px + env(safe-area-inset-bottom)); }
.tabbar ul { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); }
.tabbar a { display: grid; justify-items: center; gap: 2px; padding: 6px 0 4px; min-height: 52px; border-radius: var(--ag-radius-sm); font-size: var(--ag-text-caption); line-height: 16px; font-weight: 500; color: var(--c-text-3); }
.tabbar a svg { width: 22px; height: 22px; }
.tabbar a[aria-current='page'] { color: var(--c-accent); font-weight: 650; }
.menu-link { width: 100%; text-align: left; }
html.sheet-open { overflow: hidden; }

/* ---------- Course home ---------- */
.fde-hero { display: grid; grid-template-columns: minmax(0, 1fr) 400px; gap: 48px; align-items: center; padding-block: 56px 40px; }
.fde-hero-main { display: grid; gap: 18px; }
.fde-hero-main .t-lead { max-width: 34em; }
.resume { padding: 24px; display: grid; gap: 14px; }
.resume-label { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.resume h2 { font-size: var(--ag-text-title); line-height: var(--ag-leading-title); font-weight: 650; }
.resume .btn { justify-self: start; }
.resume-meta { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }

/* 我的进度 (from direction C): course, practice, best exam score against the 70 line, wrong answers */
.stats { padding: 24px; margin-bottom: 72px; }
.stats-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 18px; }
.stats-head h2 { font-size: var(--ag-text-title); line-height: var(--ag-leading-title); font-weight: 650; }
.stats-head .text-link { font-size: var(--ag-text-small); }
.stats-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)) minmax(0, 0.9fr); gap: 0; }
.stat { display: grid; gap: 10px; align-content: start; padding: 4px 24px; box-shadow: inset 1px 0 0 var(--c-line); }
.stat:first-child { padding-left: 0; box-shadow: none; }
.stat:last-child { padding-right: 0; }
.stat-label { font-size: var(--ag-text-small); line-height: var(--ag-leading-small); color: var(--c-text-2); font-weight: 600; }
.stat .figure { font-size: 32px; color: var(--c-text); }
.stat .figure small { font-size: var(--ag-text-small); color: var(--c-text-3); font-weight: 500; }
.stat .figure.is-bad { color: var(--c-bad); }
.stat-sub { font-size: var(--ag-text-caption); line-height: var(--ag-leading-caption); color: var(--c-text-3); }
.stat-sub .text-link { font-size: var(--ag-text-caption); text-underline-offset: 3px; }
.stat .progress { position: relative; overflow: visible; }
.stat .progress > i { overflow: hidden; }
.pass-mark { position: absolute; top: -4px; bottom: -4px; left: var(--m); width: 2px; border-radius: 1px; background: var(--c-text); }
.stat-review { background: var(--c-sunken); border-radius: var(--ag-radius-md); padding: 16px 20px; box-shadow: none; margin-left: 24px; }
.stat-review:last-child { padding-right: 20px; }
.stat-review .btn { justify-self: start; }

.chapters { display: grid; gap: 24px; padding-bottom: 72px; }
.ch-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--ag-gutter); }
.ch { display: flex; flex-direction: column; padding: 8px 8px 12px; }
.ch-head { display: grid; grid-template-columns: auto minmax(0, 1fr) 96px; gap: 4px 16px; align-items: center; padding: 16px 16px 14px; }
.ch-no { font: 600 32px/1 var(--ag-font-display); color: var(--c-gold-text); font-variant-numeric: lining-nums tabular-nums; min-width: 40px; }
.ch-head h3 { font-size: var(--ag-text-title); line-height: var(--ag-leading-title); font-weight: 650; }
.ch-head p { font-size: var(--ag-text-caption); line-height: var(--ag-leading-caption); color: var(--c-text-3); }
.ch-prog { display: grid; gap: 6px; justify-items: end; font-size: var(--ag-text-caption); color: var(--c-text-3); }
.ch-prog .progress { width: 100%; }
.sec-list { display: grid; gap: 2px; }
.sec { display: grid; grid-template-columns: 20px minmax(0, 1fr) auto; gap: 12px; align-items: center; min-height: 44px; padding: 8px 12px; border-radius: var(--ag-radius-sm); font-size: var(--ag-text-body); line-height: 24px; color: var(--c-text); }
.sec:hover { background: var(--c-tint); }
.sec .st { width: 18px; height: 18px; border-radius: 50%; box-shadow: inset 0 0 0 1.5px var(--c-line-strong); display: grid; place-items: center; }
.sec.done .st { background: var(--c-accent); box-shadow: none; color: var(--c-btn-text); }
.sec.done .st svg { width: 12px; height: 12px; stroke-width: 2.5; }
.sec.now { background: var(--c-accent-soft); box-shadow: inset 0 0 0 1px var(--c-accent-ring); }
.sec.now .st { box-shadow: inset 0 0 0 1.5px var(--c-accent); }
.sec.now .st::after { content: ''; width: 8px; height: 8px; border-radius: 50%; background: var(--c-accent); }
.sec .tag { font-size: var(--ag-text-caption); color: var(--c-text-3); white-space: nowrap; }
.sec.now .tag { color: var(--c-accent); font-weight: 600; }
.ch-foot { margin-top: auto; padding: 12px 12px 4px; }
.ch-foot .text-link { font-size: var(--ag-text-small); }

.promo { display: grid; grid-template-columns: minmax(0, 1fr) 420px; gap: 48px; align-items: center; padding: 48px; }
.promo-copy { display: grid; gap: 18px; }
.promo-copy .soft { font-size: var(--ag-text-body); line-height: var(--ag-leading-body); max-width: 34em; }
.res-row { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--ag-gutter); padding-block: 72px 16px; }
.res { display: grid; grid-template-columns: 40px minmax(0, 1fr) auto; gap: 4px 14px; align-items: center; padding: 20px 24px; text-align: left; width: 100%; color: var(--c-text); }
.res .ico { width: 40px; height: 40px; border-radius: 10px; display: grid; place-items: center; background: var(--c-muted); color: var(--c-text-2); }
.res h3 { font-size: var(--ag-text-body); line-height: 24px; font-weight: 650; }
.res p { font-size: var(--ag-text-small); line-height: var(--ag-leading-small); color: var(--c-text-3); }
.res > svg { color: var(--c-text-3); }

/* ---------- Exams ---------- */
.exam-top { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: var(--ag-gutter); align-items: stretch; }
.exam-launch { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 16px 24px; align-items: center; padding: 28px; }
.exam-launch-copy { display: grid; gap: 8px; justify-items: start; }
.exam-launch h2 { font: 600 var(--ag-text-page) / var(--ag-leading-page) var(--ag-font-display); font-synthesis-weight: none; }
.exam-launch-go { display: grid; gap: 8px; justify-items: end; text-align: right; }
.exam-launch .exam-clock { grid-column: 1 / -1; }
.exam-overview { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); margin: 0; padding: 8px; }
.exam-overview div { display: grid; gap: 6px; padding: 16px 20px; }
.exam-overview dt { font-size: var(--ag-text-small); color: var(--c-text-3); }
.exam-overview dd { margin: 0; font-size: 28px; }
.exam-overview dd small { font-size: var(--ag-text-small); color: var(--c-text-3); }
.exam-clock { display: inline-flex; align-items: center; gap: 8px; height: 40px; padding: 0 14px; border-radius: var(--ag-radius-sm); background: var(--c-sunken); color: var(--c-text-2); font-size: var(--ag-text-small); white-space: nowrap; }
.exam-clock strong, .timer { font-variant-numeric: tabular-nums; font-weight: 700; color: var(--c-text); font-size: var(--ag-text-body); }
.timer-count.urgent { color: var(--c-bad); }
.exam-list { display: grid; gap: 16px; padding-top: 56px; }
.seg { display: inline-flex; gap: 4px; padding: 4px; border-radius: var(--ag-radius-sm); background: var(--c-muted); }
.seg button { display: inline-flex; align-items: center; gap: 6px; height: 36px; padding: 0 14px; border-radius: 6px; font-size: var(--ag-text-small); font-weight: 600; color: var(--c-text-2); }
.seg button span { font-size: var(--ag-text-caption); color: var(--c-text-3); font-variant-numeric: tabular-nums; }
.seg button.active { background: var(--c-surface); color: var(--c-text); box-shadow: var(--c-raised); }
.exam-paper-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.exam-paper-row { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 16px; align-items: center; padding: 16px 20px; }
.exam-paper-row.is-active { box-shadow: inset 0 0 0 1.5px var(--c-accent), var(--ag-shadow-1); }
.paper-no { font: 600 26px/1 var(--ag-font-display); color: var(--c-gold-text); font-variant-numeric: lining-nums tabular-nums; min-width: 36px; }
.exam-paper-info { display: grid; gap: 6px; justify-items: start; }
.exam-paper-info h3 { font-size: var(--ag-text-body); font-weight: 650; line-height: 24px; }
.exam-paper-actions { display: flex; gap: 4px; align-items: center; }
.exam-rules { margin-top: 32px; }
.exam-rules-content { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; padding-top: 4px; }
.exam-rules h3 { font-size: var(--ag-text-small); font-weight: 650; margin-bottom: 8px; }
.rules { list-style: disc; padding-left: 1.2em; display: grid; gap: 4px; font-size: var(--ag-text-small); color: var(--c-text-2); }
.weight-row { display: grid; grid-template-columns: minmax(0, 1fr) 120px 44px; gap: 12px; align-items: center; padding: 5px 0; font-size: var(--ag-text-small); color: var(--c-text-2); }
.weight-row span:last-child { text-align: right; font-variant-numeric: tabular-nums; }

/* Result, check before submit */
.result-top { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 32px; align-items: center; }
.result-top > div:last-child { display: grid; gap: 10px; justify-items: start; }
.result-top .muted { font-size: var(--ag-text-small); }
.score-ring { --size: 148px; width: var(--size); height: var(--size); border-radius: 50%; display: grid; place-items: center;
  background: conic-gradient(var(--c-accent-bar) calc(var(--score) * 1%), var(--c-track) 0); }
.score-ring > div { width: calc(var(--size) - 20px); height: calc(var(--size) - 20px); border-radius: 50%; background: var(--c-surface); display: grid; place-content: center; text-align: center; gap: 2px; }
.score-ring strong { font-size: 40px; line-height: 1; font-weight: 700; font-variant-numeric: tabular-nums; }
.score-ring span { font-size: var(--ag-text-caption); color: var(--c-text-3); }
.table-wrap td button.quiet { min-height: 32px; padding: 0 8px; }
.app .table-wrap td { vertical-align: middle; }
.app .table-wrap td [data-action='history-delete'] { color: var(--c-bad); }
.result-modules { padding: 24px; margin-top: 16px; display: grid; gap: 16px; }
.result-line { font-size: var(--ag-text-title); line-height: var(--ag-leading-title); font-weight: 650; }
.rate { display: inline-grid; grid-template-columns: 72px auto; gap: 10px; align-items: center; font-variant-numeric: tabular-nums; }
.rate.is-low { color: var(--c-bad); }
.rate.is-low .progress > i { background: var(--c-bad); }
.check-card { padding: 28px; display: grid; gap: 24px; }
.check-stats { grid-template-columns: repeat(3, minmax(0, 140px)); }
.check-group { display: grid; gap: 6px; }
.check-group .ac-grid { grid-template-columns: repeat(auto-fill, minmax(44px, 1fr)); margin-top: 8px; }
.check-group .ac-grid button { height: 40px; }
.check-actions { padding-top: 20px; border-top: 1px solid var(--c-line); }
.page-head .exam-clock { align-self: end; }
.panel.table-wrap { padding: 0; }
.check-links { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0 20px; }
.check-links .secondary { min-height: 36px; }

/* ---------- Answering: practice, exam, review ---------- */
.practice { padding-block: 24px 80px; }
.pr-bar { display: grid; grid-template-columns: auto minmax(0, 1fr) 220px auto; gap: 16px; align-items: center; padding-bottom: 20px; margin-bottom: 24px; border-bottom: 1px solid var(--c-line); }
.pr-title { min-width: 0; }
.pr-title p { font-size: var(--ag-text-caption); line-height: var(--ag-leading-caption); color: var(--c-text-3); }
.pr-title h1 { font-size: var(--ag-text-title); line-height: var(--ag-leading-title); font-weight: 650; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pr-count { display: grid; gap: 6px; font-size: var(--ag-text-small); color: var(--c-text-3); }
.pr-count b { color: var(--c-text); font-weight: 700; }
.toolbar-controls { display: flex; align-items: center; gap: 8px; }
.pr-bar .card-toggle { display: none; }
.icon-back { color: var(--c-text-2); }
.switch { display: inline-flex; align-items: center; gap: 10px; height: 40px; padding: 0 8px; border-radius: var(--ag-radius-sm); font-size: var(--ag-text-small); color: var(--c-text-2); cursor: pointer; white-space: nowrap; }
.switch input { appearance: none; width: 34px; height: 20px; border-radius: 999px; background: var(--c-line-strong); position: relative; margin: 0; cursor: pointer; transition: background-color var(--ag-dur) var(--ag-ease-out); flex: none; }
.switch input::after { content: ''; position: absolute; top: 2px; left: 2px; width: 16px; height: 16px; border-radius: 50%; background: #fff; box-shadow: var(--ag-shadow-1); transition: transform var(--ag-dur) var(--ag-ease-out); }
.switch input:checked { background: var(--c-btn); }
.switch input:checked::after { transform: translateX(14px); }

.pr-grid { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: var(--ag-gutter); align-items: start; }
.pr-grid > section { min-width: 0; }
.q { padding: 28px 32px 24px; }
.q-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.q-meta .topic { font-size: var(--ag-text-caption); color: var(--c-text-3); margin-left: 4px; }
.q-meta .badge { height: 24px; }
.q-tools { margin-left: auto; display: flex; gap: 2px; }
.favorite-btn, .q-flag { display: inline-flex; align-items: center; justify-content: center; gap: 6px; height: 40px; min-width: 40px; padding: 0 10px; border-radius: var(--ag-radius-sm); color: var(--c-text-3); font-size: var(--ag-text-caption); font-weight: 600; }
.favorite-btn:hover, .q-flag:hover { background: rgb(20 35 29 / 0.05); color: var(--c-text); }
.favorite-btn svg, .q-flag svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.75; stroke-linejoin: round; }
.favorite-btn.is-on { color: var(--c-gold-text); }
.favorite-btn.is-on svg { fill: var(--ag-gold-400); stroke: var(--c-gold-text); }
.q-flag.is-flagged { color: var(--c-gold-text); background: var(--ag-gold-50); }
.q-flag.is-flagged svg { fill: var(--ag-gold-400); }
.q-stem { margin-top: 16px; font-size: var(--ag-text-title); line-height: 1.65; font-weight: 650; }
.q-hint { margin-top: 8px; font-size: var(--ag-text-small); color: var(--c-text-3); }
.opts { display: grid; gap: 10px; margin-top: 20px; }
.opt { position: relative; width: 100%; display: grid; grid-template-columns: 32px minmax(0, 1fr) auto; gap: 14px; align-items: center; text-align: left; cursor: pointer;
  min-height: 56px; padding: 10px 16px; border-radius: var(--ag-radius-md); background: var(--c-surface); box-shadow: inset 0 0 0 1px var(--c-line-strong);
  font-size: var(--ag-text-body); line-height: 1.6; transition: background-color var(--ag-dur) var(--ag-ease-out), box-shadow var(--ag-dur) var(--ag-ease-out); }
.opt input { position: absolute; opacity: 0; width: 1px; height: 1px; pointer-events: none; }
.opt:hover { background: var(--c-tint); }
.opt:focus-within { outline: var(--ag-focus-width) solid var(--ag-focus-color); outline-offset: 2px; }
.opt .l { width: 32px; height: 32px; border-radius: 50%; display: grid; place-items: center; background: var(--c-muted); font-size: var(--ag-text-small); font-weight: 700; color: var(--c-text-2); }
.opt.selected { background: var(--c-accent-soft); box-shadow: inset 0 0 0 1.5px var(--c-accent); }
.opt.selected .l { background: var(--c-btn); color: var(--c-btn-text); }
.opt .s { font-size: var(--ag-text-caption); font-weight: 650; white-space: nowrap; display: inline-flex; align-items: center; gap: 4px; }
.opt .s svg { width: 14px; height: 14px; stroke-width: 2.25; }
.opt.is-right { background: var(--c-good-soft); box-shadow: inset 0 0 0 1.5px var(--c-good); }
.opt.is-right .l { background: var(--c-good); color: var(--c-surface); }
.opt.is-right .s { color: var(--c-good); }
.opt.is-wrong { background: var(--c-bad-soft); box-shadow: inset 0 0 0 1.5px var(--c-bad); }
.opt.is-wrong .l { background: var(--c-bad); color: var(--c-surface); }
.opt.is-wrong .s { color: var(--c-bad); }
.opt.is-dim { color: var(--c-text-2); }
.opt:has(input:disabled) { cursor: default; }
.opt:has(input:disabled):hover { background: var(--c-surface); }
.opt.is-right:hover { background: var(--c-good-soft); }
.opt.is-wrong:hover { background: var(--c-bad-soft); }
.verdict { display: flex; align-items: center; flex-wrap: wrap; gap: 6px 10px; margin-top: 18px; padding: 12px 16px; border-radius: var(--ag-radius-sm); font-size: var(--ag-text-body); }
.verdict strong { font-weight: 650; }
.verdict svg { width: 18px; height: 18px; stroke-width: 2.25; }
.verdict.good { background: var(--c-good-soft); color: var(--c-good); }
.verdict.bad { background: var(--c-bad-soft); color: var(--c-bad); }
.verdict span { font-weight: 500; color: var(--c-text-2); }
.explain { margin-top: 24px; padding-top: 22px; border-top: 1px solid var(--c-line); display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; }
.explain h3 { font-size: var(--ag-text-body); font-weight: 650; }
.explain > p { font-size: var(--ag-text-body); line-height: 1.8; color: var(--c-text-2); }
.explain .direct-answer strong { color: var(--c-good); }
.analysis-collapsed .analysis { display: none; }
.disclose { border-radius: var(--ag-radius-md); background: var(--c-sunken); }
.disclose > summary { list-style: none; display: flex; align-items: center; gap: 10px; min-height: 48px; padding: 0 16px; cursor: pointer; font-size: var(--ag-text-small); font-weight: 650; border-radius: var(--ag-radius-md); }
.disclose > summary::-webkit-details-marker { display: none; }
.disclose > summary .sub { font-weight: 500; color: var(--c-text-3); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }
.disclose > summary::after { content: ''; margin-left: auto; flex: none; width: 8px; height: 8px; border-right: 1.5px solid var(--c-text-3); border-bottom: 1.5px solid var(--c-text-3); transform: rotate(45deg); transition: transform var(--ag-dur) var(--ag-ease-out); }
.disclose[open] > summary::after { transform: rotate(-135deg); }
.disclose-body { padding: 0 16px 16px; display: grid; grid-template-columns: minmax(0, 1fr); gap: 10px; }
.disclose-body > p { font-size: var(--ag-text-small); line-height: var(--ag-leading-small); color: var(--c-text-2); }
.evidence { display: grid; gap: 8px; }
.evidence + .evidence { padding-top: 12px; border-top: 1px solid var(--c-line); }
.evidence blockquote { padding: 12px 16px; border-radius: var(--ag-radius-sm); background: var(--c-surface); font-size: var(--ag-text-body); line-height: 1.8; color: var(--c-text); box-shadow: var(--c-ring); white-space: pre-line; }
.evidence .t-caption { color: var(--c-text-3); }
.evidence-links { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 18px; font-size: var(--ag-text-small); }
.quiet-link { color: var(--c-text-3); text-decoration: underline; text-underline-offset: 4px; }
.quiet-link:hover { color: var(--c-text); }
.question-note { margin-top: 16px; }
.question-note textarea { width: 100%; min-height: 96px; resize: vertical; font-size: var(--ag-text-body); }
.q-actions { display: flex; align-items: center; gap: 12px; margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--c-line); }
.q-actions .kbd-hint { margin-right: auto; }
.kbd-hint { font-size: var(--ag-text-caption); color: var(--c-text-3); }
.kbd-hint kbd { font: 600 var(--ag-text-caption)/1 var(--ag-font-sans); padding: 3px 6px; border-radius: var(--ag-radius-xs); background: var(--c-muted); color: var(--c-text-2); }
.round-footer { display: flex; align-items: center; gap: 16px; padding: 16px 4px 0; font-size: var(--ag-text-small); }
.round-footer .text-link { font-size: var(--ag-text-small); }

.pr-side { display: grid; gap: 16px; position: sticky; top: calc(var(--hd-height) + 24px); }
.drawer-head, .drawer-scrim { display: none; }
.ac-box { padding: 20px; display: grid; gap: 14px; }
.answer-card { display: grid; gap: 14px; }
.answer-card > summary { list-style: none; display: flex; align-items: baseline; justify-content: space-between; gap: 12px; cursor: default; }
.answer-card > summary::-webkit-details-marker { display: none; }
.answer-card:not([open]) > summary { cursor: pointer; }
.ac-head h2 { font-size: var(--ag-text-body); font-weight: 650; }
.ac-head span { font-size: var(--ag-text-caption); color: var(--c-text-3); }
.ac-legend { display: flex; flex-wrap: wrap; gap: 6px 14px; font-size: var(--ag-text-caption); color: var(--c-text-3); margin-top: 12px; }
.ac-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 6px; vertical-align: -1px; box-shadow: inset 0 0 0 1.5px var(--c-line-strong); }
.ac-legend .state-right i { background: var(--c-good); box-shadow: none; }
.ac-legend .state-wrong i { background: var(--c-bad); box-shadow: none; }
.ac-legend .state-answered i { background: var(--c-accent); box-shadow: none; }
.ac-legend .state-flagged i { background: var(--c-gold-figure); box-shadow: none; border-radius: 50%; }
.ac-grid { display: grid; grid-template-columns: repeat(8, minmax(0, 1fr)); gap: 6px; margin-top: 14px; }
.ac-grid button { position: relative; display: grid; place-items: center; height: 32px; border-radius: 6px; font-size: var(--ag-text-caption); font-weight: 600; font-variant-numeric: tabular-nums; color: var(--c-text-2); box-shadow: inset 0 0 0 1px var(--c-line); }
.ac-grid button:hover { box-shadow: inset 0 0 0 1px var(--c-icon-weak); }
.ac-grid .state-right { background: var(--c-good-soft); color: var(--c-good); box-shadow: none; }
.ac-grid .state-wrong { background: var(--c-bad-soft); color: var(--c-bad); box-shadow: none; }
.ac-grid .answered { background: var(--c-accent-soft); color: var(--c-accent); box-shadow: none; }
.ac-grid .current { box-shadow: inset 0 0 0 2px var(--c-text); color: var(--c-text); }
.ac-grid .flagged::after { content: ''; position: absolute; top: 3px; right: 3px; width: 6px; height: 6px; border-radius: 50%; background: var(--c-gold-figure); }
.ac-pager { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-top: 14px; font-size: var(--ag-text-caption); color: var(--c-text-3); }
.ac-pager .icon-btn { width: 36px; height: 36px; }
.ac-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; padding-top: 14px; border-top: 1px solid var(--c-line); margin: 0; }
.ac-stats div { display: grid; gap: 4px; }
.ac-stats dt { font-size: var(--ag-text-caption); color: var(--c-text-3); }
.ac-stats dd { margin: 0; font-size: var(--ag-text-title); font-weight: 700; font-variant-numeric: tabular-nums; }
.ac-stats dd small { font-size: var(--ag-text-caption); color: var(--c-text-3); font-weight: 500; }
.side-cta { padding: 18px 20px; display: grid; gap: 8px; background: var(--c-sunken); box-shadow: none; }
.side-cta h3 { font-size: var(--ag-text-small); line-height: 20px; font-weight: 650; }
.side-cta p { font-size: var(--ag-text-caption); line-height: var(--ag-leading-caption); color: var(--c-text-2); }
.side-cta .text-link { font-size: var(--ag-text-small); }
.abar { display: none; }
.abar .rbar-inner { grid-template-columns: 1fr 1.2fr 1fr; }
.abar .rbar-btn { justify-content: center; box-shadow: inset 0 0 0 1px var(--c-line-strong); }
.abar .rbar-next { box-shadow: none; }
.review-current-state { height: 28px; }
.summary-card { padding: 24px; display: grid; gap: 20px; }
.round-stats { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 12px; margin: 0; }
.round-stats div { display: grid; gap: 6px; }
.round-stats dt { font-size: var(--ag-text-small); color: var(--c-text-3); }
.round-stats dd { margin: 0; font-size: 28px; }
.round-stats dd small { font-size: var(--ag-text-small); color: var(--c-text-3); }
.figure.is-bad { color: var(--c-bad); }
.summary-grid { margin-top: 16px; }
.summary-grid .ac-grid { grid-template-columns: repeat(auto-fill, minmax(44px, 1fr)); }

/* ---------- Question bank ---------- */
.resume-strip { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 16px 24px; align-items: center; padding: 20px 24px; margin-bottom: 16px; }
.resume-strip > div { display: grid; gap: 6px; }
.resume-strip strong { font-size: var(--ag-text-title); line-height: var(--ag-leading-title); font-weight: 650; }
.resume-strip .progress { max-width: 360px; }
.practice-links { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.practice-links b { color: var(--c-accent); font-variant-numeric: tabular-nums; }
.bank-sub { margin: 40px 0 16px; }
.module-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.module-card { display: grid; gap: 8px; align-content: start; padding: 20px; text-align: left; color: var(--c-text); width: 100%; }
.module-no { font: 600 20px/1 var(--ag-font-display); color: var(--c-gold-text); }
.module-no svg { width: 20px; height: 20px; color: var(--c-gold-text); }
.module-card strong { font-size: var(--ag-text-body); line-height: 24px; font-weight: 650; min-height: 48px; }
.module-meta { font-size: var(--ag-text-caption); color: var(--c-text-3); }
.module-progress { margin-top: 4px; }
.module-cta { margin-top: 6px; font-size: var(--ag-text-small); }
.module-card.mixed { background: var(--c-sunken); box-shadow: none; }
.mixed-count-label { display: flex; align-items: center; gap: 8px; font-size: var(--ag-text-small); color: var(--c-text-2); }
.mixed-count-label select { min-height: 36px; }
.module-card.mixed .btn { justify-self: start; margin-top: 4px; }
.custom-mix { margin-top: 24px; }
.module-options { display: flex; flex-wrap: wrap; gap: 8px; }
.module-options label { display: inline-flex; align-items: center; gap: 8px; min-height: 40px; padding: 0 12px; border-radius: var(--ag-radius-sm); background: var(--c-surface); box-shadow: inset 0 0 0 1px var(--c-line); font-size: var(--ag-text-small); cursor: pointer; }
.module-options label:has(input:checked) { background: var(--c-accent-soft); box-shadow: inset 0 0 0 1.5px var(--c-accent); color: var(--c-accent); font-weight: 600; }
.round-settings { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-top: 12px; }
.round-settings label { display: inline-flex; align-items: center; gap: 8px; font-size: var(--ag-text-small); color: var(--c-text-2); }
.bank-controls { display: grid; gap: 12px; }
.filters { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.filters #search { flex: 1 1 260px; }
#filter-summary { color: var(--c-accent); }
.bank-controls .round-settings { margin-top: 0; padding-top: 12px; border-top: 1px solid var(--c-line); }
.bank-item { display: grid; gap: 8px; padding: 18px 20px; margin-top: 10px; border-radius: var(--ag-radius-md); background: var(--c-surface); box-shadow: var(--c-raised); color: var(--c-text); transition: box-shadow var(--ag-dur) var(--ag-ease-out); }
.bank-item:hover { box-shadow: var(--c-floating); }
.bank-item p { font-size: var(--ag-text-body); line-height: 1.7; }
.bank-item.last-visited { box-shadow: inset 0 0 0 1.5px var(--c-accent), var(--ag-shadow-1); }
.question-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-size: var(--ag-text-caption); color: var(--c-text-3); }
.status-chip { display: inline-flex; align-items: center; height: 22px; padding: 0 8px; border-radius: var(--ag-radius-xs); background: var(--c-muted); color: var(--c-text-2); font-weight: 600; }
.status-chip.state-right { background: var(--c-good-soft); color: var(--c-good); }
.status-chip.state-wrong { background: var(--c-bad-soft); color: var(--c-bad); }
.question-actions { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; margin-top: 20px; }
.page-jump { display: inline-flex; align-items: center; gap: 8px; font-size: var(--ag-text-small); color: var(--c-text-2); }
.page-jump input { width: 72px; }

/* ---------- Records and account ---------- */
.learning-tabs { display: flex; flex-wrap: wrap; gap: 4px; padding: 4px; border-radius: var(--ag-radius-sm); background: var(--c-muted); width: fit-content; margin-bottom: 16px; }
.learning-tabs a { white-space: nowrap; display: inline-flex; align-items: center; gap: 6px; height: 40px; padding: 0 16px; border-radius: 6px; font-size: var(--ag-text-small); font-weight: 600; color: var(--c-text-2); }
.learning-tabs a span { font-size: var(--ag-text-caption); color: var(--c-text-3); font-variant-numeric: tabular-nums; }
.learning-tabs a.active { background: var(--c-surface); color: var(--c-text); box-shadow: var(--c-raised); }
.table-wrap td a { color: var(--c-accent); font-weight: 600; margin-right: 8px; }
.table-wrap td strong { font-size: var(--ag-text-body); }
.learning-list .section-line { margin-top: 8px; }
.learning-item { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px; align-items: start; margin-top: 10px; padding: 6px; border-radius: var(--ag-radius-md); background: var(--c-surface); box-shadow: var(--c-raised); }
.learning-open { display: grid; gap: 6px; padding: 12px 14px; text-align: left; border-radius: var(--ag-radius-sm); color: var(--c-text); }
.learning-open:hover { background: var(--c-tint); }
.learning-open strong { font-size: var(--ag-text-body); line-height: 1.7; font-weight: 500; }
.learning-note { font-size: var(--ag-text-small); color: var(--c-text-2); padding: 8px 12px; border-radius: var(--ag-radius-sm); background: var(--c-sunken); white-space: pre-line; }
.records-management { margin-top: 24px; padding: 0; }
.records-management > summary { list-style: none; cursor: pointer; padding: 16px 20px; font-size: var(--ag-text-small); font-weight: 650; }
.records-management > summary::-webkit-details-marker { display: none; }
.records-management > summary { display: flex; align-items: center; }
.records-management > summary::after { content: ''; margin-left: auto; width: 8px; height: 8px; border-right: 1.5px solid var(--c-text-3); border-bottom: 1.5px solid var(--c-text-3); transform: rotate(45deg); transition: transform var(--ag-dur) var(--ag-ease-out); }
.records-management[open] > summary::after { transform: rotate(-135deg); }
.records-management > .actions, .records-management > .note { padding: 0 20px; }
.records-management > .note { padding-bottom: 20px; margin-top: 10px; }
.records-management label.secondary { position: relative; }
.account-layout { display: grid; grid-template-columns: 320px minmax(0, 1fr); gap: var(--ag-gutter); align-items: start; }
.account-layout > .panel { margin-top: 0; }
.account-profile { display: grid; gap: 12px; justify-items: start; }
.account-avatar { width: 56px; height: 56px; border-radius: 50%; display: grid; place-items: center; background: var(--c-deep); color: var(--c-on-deep); font: 600 22px/1 var(--ag-font-display); }
.account-profile h2 { margin: 0; overflow-wrap: anywhere; }
.account-meta { display: grid; gap: 8px; width: 100%; margin: 4px 0; padding-top: 12px; border-top: 1px solid var(--c-line); }
.account-meta div { display: flex; justify-content: space-between; gap: 12px; font-size: var(--ag-text-small); }
.account-meta dt { color: var(--c-text-3); }
.account-meta dd { margin: 0; color: var(--c-text); font-variant-numeric: tabular-nums; }
.account-privacy { display: flex; align-items: center; gap: 8px; font-size: var(--ag-text-caption); color: var(--c-text-3); }
.account-privacy svg, .account-tip svg { width: 16px; height: 16px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.75; stroke-linecap: round; stroke-linejoin: round; }
.account-form { display: grid; gap: 16px; }
.account-form-head h2 { margin: 0; }
.account-tip { display: flex; gap: 10px; align-items: flex-start; padding: 12px 14px; border-radius: var(--ag-radius-sm); background: var(--c-tint); color: var(--c-text-2); font-size: var(--ag-text-small); line-height: var(--ag-leading-small); }
.account-tip svg { margin-top: 3px; color: var(--c-accent); }
.account-fields { display: grid; gap: 14px; }
.account-field { display: grid; gap: 6px; font-size: var(--ag-text-small); font-weight: 600; }
.account-field em { font-style: normal; font-weight: 500; color: var(--c-text-3); margin-left: 8px; }
.account-field input { width: 100%; min-height: 44px; }
.account-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.account-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }

/* ---------- Lesson reader ---------- */
.lesson-page .ft { margin-top: 0; }
.lesson-layout { --wrap: 1280px; display: grid; grid-template-columns: 248px minmax(0, var(--rd-measure)) 208px; justify-content: space-between; gap: 48px; padding-block: 32px 80px; }
.lesson-side, .lesson-rail { position: sticky; top: calc(var(--hd-height) + 24px); align-self: start; max-height: calc(100svh - var(--hd-height) - 48px); overflow: auto; scrollbar-width: thin; }
.side-back { display: inline-flex; align-items: center; gap: 6px; font-size: var(--ag-text-small); color: var(--c-text-3); margin-bottom: 12px; padding: 4px 0; }
.side-back:hover { color: var(--c-text); }
.toc { display: grid; gap: 4px; }
.toc details { border-radius: var(--ag-radius-md); }
.toc summary { list-style: none; display: grid; grid-template-columns: minmax(0, 1fr) auto 16px; gap: 8px; align-items: center; cursor: pointer; padding: 10px; border-radius: var(--ag-radius-sm); font-size: var(--ag-text-small); line-height: 20px; font-weight: 650; color: var(--c-text); }
.toc summary::-webkit-details-marker { display: none; }
.toc summary::after { content: ''; width: 8px; height: 8px; border-right: 1.5px solid var(--c-text-3); border-bottom: 1.5px solid var(--c-text-3); transform: rotate(-45deg); justify-self: center; transition: transform var(--ag-dur) var(--ag-ease-out); }
.toc details[open] > summary::after { transform: rotate(45deg); }
.toc summary:hover { background: rgb(20 35 29 / 0.04); }
.toc summary small { font-size: var(--ag-text-caption); font-weight: 500; color: var(--c-text-3); font-variant-numeric: tabular-nums; }
.toc .ch-label { display: block; font-size: var(--ag-text-caption); font-weight: 500; color: var(--c-text-3); line-height: 16px; }
.toc-list { display: grid; gap: 2px; padding-bottom: 6px; }
.toc-sec { display: grid; grid-template-columns: 14px minmax(0, 1fr); gap: 10px; align-items: start; padding: 8px 10px; border-radius: var(--ag-radius-sm); font-size: var(--ag-text-small); line-height: 20px; color: var(--c-text-2); }
.toc-sec:hover { background: rgb(20 35 29 / 0.04); color: var(--c-text); }
.toc-sec .dot { width: 10px; height: 10px; margin-top: 5px; border-radius: 50%; box-shadow: inset 0 0 0 1.5px var(--c-line-strong); }
.toc-sec.done .dot { background: var(--c-accent); box-shadow: none; }
.toc-sec[aria-current='page'] { background: var(--c-accent-soft); color: var(--c-accent); font-weight: 650; box-shadow: inset 0 0 0 1px var(--c-accent-ring); }
.toc-sec[aria-current='page'] .dot { box-shadow: inset 0 0 0 2px var(--c-accent); background: transparent; }
.side-res { display: flex; align-items: center; gap: 8px; margin-top: 16px; padding: 12px 10px 0; border-top: 1px solid var(--c-line); font-size: var(--ag-text-small); color: var(--c-text-2); }
.side-res:hover { color: var(--c-text); }
.lesson { min-width: 0; }
.lesson-head { display: grid; gap: 14px; margin: 0 0 32px; padding-bottom: 28px; border-bottom: 1px solid var(--c-line); }
.lesson-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 16px; font-size: var(--ag-text-small); color: var(--c-text-3); min-height: 22px; }
.lesson-meta span { display: inline-flex; align-items: center; gap: 6px; }
.lesson-rail { display: flex; flex-direction: column; overflow: hidden; }
.lesson-rail .outline { min-height: 0; overflow: auto; scrollbar-width: thin; flex: 0 1 auto; }
.lesson-rail .rail-card { flex: none; }
.lesson-rail.no-outline .rail-title, .lesson-rail.no-outline .outline { display: none; }
.lesson-rail .rail-card { margin-top: 24px; }
.lesson-rail.no-outline .rail-card { margin-top: 0; }
.rail-card[hidden] { display: none; }
.read-progress { position: absolute; left: 0; right: 0; bottom: -1px; height: 2px; }

/* Lesson body: the imported HTML as is; spacing, type and widgets only. */
.htmlLesson { font-size: var(--rd-text); line-height: var(--rd-leading); color: var(--c-text); }
.htmlLesson > * + * { margin-top: 1em; }
.htmlLesson > .kicker-group, .htmlLesson > h2.sec-title, .htmlLesson > .chapter-footer, .htmlLesson > .fab { display: none; }
.lesson-split .htmlLesson > h3.sub-title[data-ref] { display: none; }
.lesson-split .htmlLesson > [hidden] + *, .lesson-split .htmlLesson > :first-child:not([hidden]) { margin-top: 0; }
.htmlLesson .standfirst { font-size: var(--ag-text-lead); line-height: 1.85; color: var(--c-text-2); padding: 16px 20px; border-radius: var(--ag-radius-md); background: var(--c-tint); }
.htmlLesson .lead { font-size: var(--ag-text-lead); line-height: 1.85; color: var(--c-text-2); }
.htmlLesson .lead strong { font-weight: 500; color: var(--c-text); }
.htmlLesson h3.sub-title { margin-top: 2.2em; font-size: var(--ag-text-heading); line-height: var(--ag-leading-heading); font-weight: 650; scroll-margin-top: calc(var(--hd-height) + 24px); }
.htmlLesson h3.sub-title > span:first-child { color: var(--c-gold-text); margin-right: 10px; }
.htmlLesson .sub-sub { margin-top: 2em; font-size: var(--ag-text-title); line-height: var(--ag-leading-title); font-weight: 650; scroll-margin-top: calc(var(--hd-height) + 24px); }
.htmlLesson h4.sub-sub { font-size: var(--ag-text-title); }
.htmlLesson h4:not(.sub-sub) { margin-top: 1.6em; font-size: var(--ag-text-body); line-height: var(--ag-leading-body); font-weight: 650; }
.htmlLesson .sub-sub strong, .htmlLesson h4 strong { font-weight: inherit; }
.htmlLesson h3 + *, .htmlLesson h4 + * { margin-top: 0.6em; }
.htmlLesson strong, .htmlLesson b { font-weight: 650; }
.htmlLesson a:not(.btn) { color: var(--c-accent); text-decoration: underline; text-decoration-color: color-mix(in srgb, var(--c-accent) 35%, transparent); text-underline-offset: 4px; }
.htmlLesson ul, .htmlLesson ol { padding-left: 1.4em; }
.htmlLesson ul { list-style: disc; }
.htmlLesson ol { list-style: decimal; }
.htmlLesson li + li { margin-top: 0.35em; }
.htmlLesson li::marker { color: var(--c-text-3); }
.htmlLesson figure { margin-top: 1.6em; }
.htmlLesson .shot-img img { width: 100%; border-radius: var(--ag-radius-md); box-shadow: var(--c-img-ring); background: var(--c-surface); cursor: zoom-in; }
.htmlLesson figcaption { margin-top: 10px; font-size: var(--ag-text-small); line-height: var(--ag-leading-small); color: var(--c-text-3); text-align: center; }
.htmlLesson .chapter-meta { display: grid; grid-template-columns: 4px minmax(0, 1fr); gap: 0 16px; padding: 18px 20px 18px 0; border-radius: var(--ag-radius-md); background: var(--c-sunken); }
.htmlLesson .chapter-meta::before { content: ''; border-radius: 0 4px 4px 0; background: var(--c-gold-rule); }
.htmlLesson .chapter-meta-label { font-size: var(--ag-text-small); line-height: var(--ag-leading-small); font-weight: 650; color: var(--c-text); }
.htmlLesson .chapter-meta p { margin-top: 4px; font-size: var(--ag-text-body); line-height: 1.8; color: var(--c-text-2); }
.htmlLesson .callout { padding: 18px 20px; border-radius: var(--ag-radius-md); background: var(--c-tint); }
.htmlLesson .callout > * + * { margin-top: 0.6em; }
.htmlLesson .callout p, .htmlLesson .callout li { font-size: var(--ag-text-body); line-height: 1.8; }
.htmlLesson .callout-title { font-size: var(--ag-text-small); line-height: var(--ag-leading-small); font-weight: 650; color: var(--c-accent); }
.htmlLesson .table-wrap { margin-top: 1.4em; }
.htmlLesson .table-wrap table { min-width: 560px; }
.htmlLesson .table-wrap td:first-child { white-space: normal; min-width: 8em; }
.htmlLesson .table-wrap th strong { font-weight: 600; }
.htmlLesson .table-wrap tr:hover td { background: rgb(20 35 29 / 0.02); }
.htmlLesson table.parallel-table td:first-child { font-weight: 400; }
.htmlLesson code { font: 0.86em/1 var(--ag-font-mono); padding: 0.18em 0.4em; border-radius: var(--ag-radius-xs); background: var(--c-muted); }
.htmlLesson .prompt-box { position: relative; padding: 16px 20px; padding-right: 88px; border-radius: var(--ag-radius-md); background: var(--c-code-bg); box-shadow: var(--c-ring); font-size: var(--ag-text-body); line-height: 1.8; }
.htmlLesson .prompt-box > p + p { margin-top: 0.5em; }
.htmlLesson .copy-btn, .htmlLesson .ix-form-copy { position: absolute; top: 10px; right: 10px; display: inline-flex; align-items: center; height: 32px; padding: 0 12px; border-radius: 6px; background: var(--c-surface); box-shadow: inset 0 0 0 1px var(--c-line-strong); font-size: var(--ag-text-caption); font-weight: 600; color: var(--c-text-2); }
.htmlLesson .copy-btn:hover, .htmlLesson .ix-form-copy:hover { color: var(--c-text); box-shadow: inset 0 0 0 1px var(--c-icon-weak); }
.htmlLesson .copy-btn.copied { background: var(--c-good-soft); color: var(--c-good); box-shadow: none; }
.htmlLesson pre { margin-top: 1em; padding: 14px 16px; border-radius: var(--ag-radius-md); background: var(--c-code-bg); box-shadow: var(--c-ring); font: 14px/1.7 var(--ag-font-mono); white-space: pre-wrap; overflow-wrap: anywhere; }

/* Lesson quizzes: three options a row; answered options use colour + letter + words */
.htmlLesson .quiz { padding: 20px; border-radius: var(--ag-radius-md); background: var(--c-surface); box-shadow: var(--c-raised); }
.htmlLesson .quiz-head { display: flex; align-items: center; gap: 8px; font-size: var(--ag-text-caption); color: var(--c-text-3); }
.htmlLesson .quiz-tag { display: none; }
.htmlLesson .quiz-num { display: inline-flex; align-items: center; height: 24px; padding: 0 8px; border-radius: var(--ag-radius-xs); background: var(--c-accent-soft); color: var(--c-accent); font-weight: 600; }
.htmlLesson .quiz-num::before { content: '课内小测 · '; }
.htmlLesson .quiz-q { margin-top: 10px; font-size: var(--ag-text-body); line-height: 1.75; font-weight: 650; }
.htmlLesson .quiz-options { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin-top: 12px; list-style: none; padding-left: 0; }
.htmlLesson .quiz-options li + li { margin-top: 0; }
.htmlLesson .quiz-opt { width: 100%; height: 100%; display: flex; align-items: center; gap: 10px; min-height: 44px; padding: 8px 12px; border-radius: var(--ag-radius-sm); background: var(--c-surface); box-shadow: inset 0 0 0 1px var(--c-line-strong); font-size: var(--ag-text-small); line-height: 1.6; text-align: left; color: var(--c-text); }
.htmlLesson .quiz-opt:hover:not(:disabled) { background: var(--c-tint); }
.htmlLesson .quiz-opt:disabled { cursor: default; }
.htmlLesson .opt-letter { width: 24px; height: 24px; border-radius: 50%; flex: none; display: grid; place-items: center; background: var(--c-muted); font-size: var(--ag-text-caption); font-weight: 700; color: var(--c-text-2); }
.htmlLesson .quiz-opt.selected { background: var(--c-accent-soft); box-shadow: inset 0 0 0 1.5px var(--c-accent); }
.htmlLesson .quiz-opt.selected .opt-letter { background: var(--c-btn); color: var(--c-btn-text); }
.htmlLesson .quiz-opt.correct { background: var(--c-good-soft); box-shadow: inset 0 0 0 1.5px var(--c-good); font-weight: 600; }
.htmlLesson .quiz-opt.correct .opt-letter { background: var(--c-good); color: var(--c-surface); }
.htmlLesson .quiz-opt.correct::after { content: '正确'; margin-left: auto; font-size: var(--ag-text-caption); color: var(--c-good); font-weight: 650; }
.htmlLesson .quiz-opt.wrong { background: var(--c-bad-soft); box-shadow: inset 0 0 0 1.5px var(--c-bad); }
.htmlLesson .quiz-opt.wrong .opt-letter { background: var(--c-bad); color: var(--c-surface); }
.htmlLesson .quiz-opt.wrong::after { content: '你的选择'; margin-left: auto; font-size: var(--ag-text-caption); color: var(--c-bad); font-weight: 650; white-space: nowrap; }
.htmlLesson .quiz-submit { margin-top: 12px; display: inline-flex; align-items: center; height: 40px; padding: 0 16px; border-radius: var(--ag-radius-sm); background: var(--c-btn); color: var(--c-btn-text); font-size: var(--ag-text-small); font-weight: 600; }
.htmlLesson .quiz-submit:disabled { background: var(--c-muted); color: var(--c-text-3); }
.htmlLesson .quiz-feedback { display: none; margin-top: 12px; padding: 12px 14px; border-radius: var(--ag-radius-sm); background: var(--c-sunken); font-size: var(--ag-text-small); line-height: var(--ag-leading-small); color: var(--c-text-2); }
.htmlLesson .quiz-feedback.show { display: block; }
.htmlLesson .quiz-feedback.ok { background: var(--c-good-soft); }
.htmlLesson .quiz-feedback.bad { background: var(--c-bad-soft); }
.htmlLesson .quiz-feedback b { margin-right: 6px; font-weight: 650; }
.htmlLesson .quiz-feedback.ok b { color: var(--c-good); }
.htmlLesson .quiz-feedback.bad b { color: var(--c-bad); }

/* Interactive blocks: the chosen node is a solid button with white text */
.htmlLesson .ix-block { padding: 20px; border-radius: var(--ag-radius-md); background: var(--c-surface); box-shadow: var(--c-raised); }
.htmlLesson .ix-block > div > p:first-child { font-size: var(--ag-text-body); color: var(--c-text-2); }
.htmlLesson .ix-block figcaption { display: flex; justify-content: space-between; gap: 12px; margin-top: 14px; text-align: left; font-size: var(--ag-text-caption); color: var(--c-text-3); }
.htmlLesson .ix-tag { display: inline-flex; align-items: center; height: 22px; padding: 0 8px; border-radius: var(--ag-radius-xs); background: var(--c-muted); color: var(--c-text-2); font-weight: 600; white-space: nowrap; }
.htmlLesson .ix-flow, .htmlLesson .ix-tabs { display: grid; grid-template-columns: repeat(auto-fit, minmax(112px, 1fr)); gap: 8px; margin-top: 14px; }
.htmlLesson .ix-tab { display: grid; gap: 2px; justify-items: start; align-content: start; text-align: left; padding: 10px 12px; border-radius: var(--ag-radius-sm); background: var(--c-page); box-shadow: inset 0 0 0 1px var(--c-line); transition: background-color var(--ag-dur) var(--ag-ease-out); color: var(--c-text); }
.htmlLesson .ix-tab span { font-size: var(--ag-text-caption); font-weight: 700; color: var(--c-text-3); font-variant-numeric: tabular-nums; }
.htmlLesson .ix-tab strong { font-size: var(--ag-text-small); line-height: 20px; font-weight: 650; }
.htmlLesson .ix-tab small { font-size: var(--ag-text-caption); line-height: 16px; color: var(--c-text-3); }
.htmlLesson .ix-tab:hover { box-shadow: inset 0 0 0 1px var(--c-line-strong); }
.htmlLesson .ix-tab.active { background: var(--c-btn); box-shadow: none; }
.htmlLesson .ix-tab.active span, .htmlLesson .ix-tab.active strong, .htmlLesson .ix-tab.active small { color: var(--c-btn-text); }
.htmlLesson .ix-panel { display: none; margin-top: 12px; padding: 16px 18px; border-radius: var(--ag-radius-sm); background: var(--c-tint); }
.htmlLesson .ix-panel.active { display: block; }
.htmlLesson .ix-panel > * + * { margin-top: 0.4em; }
.htmlLesson .ix-panel-title { margin-top: 0; font-size: var(--ag-text-body); line-height: 1.6; font-weight: 650; }
/* The one English eyebrow inside a lesson widget (「REQUIREMENT CHECK」); the caption tag below names it in Chinese. */
.htmlLesson .ix-block > div > .ix-panel-label:first-child:has(+ .ix-app) { display: none; }
.htmlLesson .ix-panel-label { margin-top: 10px; font-size: var(--ag-text-caption); line-height: 18px; font-weight: 650; color: var(--c-text-3); }
.htmlLesson .ix-panel p, .htmlLesson .ix-panel li { font-size: var(--ag-text-body); line-height: 1.7; }
.htmlLesson .ix-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 10px; margin-top: 14px; }
.htmlLesson .ix-card { position: relative; display: grid; min-height: 132px; padding: 0; text-align: left; border-radius: var(--ag-radius-md); background: var(--c-surface); box-shadow: inset 0 0 0 1px var(--c-line-strong); color: var(--c-text); overflow: hidden; }
.htmlLesson .ix-card-front, .htmlLesson .ix-card-back { grid-area: 1 / 1; padding: 14px 16px; transition: opacity var(--ag-dur) var(--ag-ease-out); }
.htmlLesson .ix-card-front { display: grid; align-content: center; gap: 4px; }
.htmlLesson .ix-card-front strong { font-size: var(--ag-text-body); font-weight: 650; }
.htmlLesson .ix-card-front > span { font-size: var(--ag-text-caption); color: var(--c-text-3); }
.htmlLesson .ix-card-front::after { content: '点击翻面'; font-size: var(--ag-text-caption); color: var(--c-accent); margin-top: 6px; }
.htmlLesson .ix-card-back { opacity: 0; visibility: hidden; display: grid; gap: 6px; align-content: start; background: var(--c-tint); font-size: var(--ag-text-small); line-height: var(--ag-leading-small); }
.htmlLesson .ix-card-back p { margin: 0; }
.htmlLesson .ix-card-back strong { font-size: var(--ag-text-small); }
.htmlLesson .ix-card.flipped { box-shadow: inset 0 0 0 1.5px var(--c-accent); }
.htmlLesson .ix-card.flipped .ix-card-front { opacity: 0; visibility: hidden; }
.htmlLesson .ix-card.flipped .ix-card-back { opacity: 1; visibility: visible; }
.htmlLesson .ix-card-reset, .htmlLesson .ix-sort-check, .htmlLesson .ix-sort-reset, .htmlLesson .ix-form-toggle {
  display: inline-flex; align-items: center; height: 40px; padding: 0 16px; margin: 12px 8px 0 0; border-radius: var(--ag-radius-sm);
  font-size: var(--ag-text-small); font-weight: 600; background: var(--c-surface); box-shadow: inset 0 0 0 1px var(--c-line-strong); color: var(--c-text); }
.htmlLesson .ix-sort-check { background: var(--c-btn); color: var(--c-btn-text); box-shadow: none; }
.htmlLesson .ix-card-reset:disabled { opacity: 0.5; cursor: default; }
.htmlLesson .ix-sort { display: grid; gap: 6px; margin-top: 12px; }
.htmlLesson .ix-sort-item { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 48px; padding: 6px 8px 6px 16px; border-radius: var(--ag-radius-sm); background: var(--c-page); box-shadow: inset 0 0 0 1px var(--c-line); font-size: var(--ag-text-body); }
.htmlLesson .ix-sort-moves { display: inline-flex; gap: 4px; }
.htmlLesson .ix-sort-moves button { width: 36px; height: 36px; border-radius: 6px; background: var(--c-surface); box-shadow: inset 0 0 0 1px var(--c-line-strong); font-weight: 700; color: var(--c-text-2); }
.htmlLesson .ix-sort-moves button:disabled { opacity: 0.35; cursor: default; }
.htmlLesson .ix-sort-result { display: none; margin-top: 12px; padding: 12px 14px; border-radius: var(--ag-radius-sm); font-size: var(--ag-text-small); line-height: var(--ag-leading-small); }
.htmlLesson .ix-sort-result.show { display: block; }
.htmlLesson .ix-sort-result.ok { background: var(--c-good-soft); color: var(--c-good); }
.htmlLesson .ix-sort-result.bad { background: var(--c-bad-soft); color: var(--c-bad); }
.htmlLesson .ix-form { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-top: 12px; }
.htmlLesson .ix-field { display: grid; gap: 6px; font-size: var(--ag-text-small); font-weight: 600; color: var(--c-text); }
.htmlLesson .ix-field textarea, .htmlLesson .ix-field input, .htmlLesson .ix-field select { width: 100%; font-weight: 400; font-size: var(--ag-text-small); }
.htmlLesson .ix-field textarea { min-height: 88px; resize: vertical; }
.htmlLesson .ix-form-answer { display: none; margin-top: 12px; padding: 16px 18px; border-radius: var(--ag-radius-sm); background: var(--c-tint); }
.htmlLesson .ix-form-answer.show { display: block; }
.htmlLesson .ix-form-answer > * + * { margin-top: 0.5em; }
.htmlLesson .ix-form-head { position: relative; display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 16px; min-height: 40px; }
.htmlLesson .ix-form-head .ix-form-copy { position: static; }
.htmlLesson .ix-form-output { margin-top: 8px; }
.htmlLesson .case-flow { padding: 18px 20px; border-radius: var(--ag-radius-md); background: var(--c-sunken); }
.htmlLesson .case-flow-label { font-size: var(--ag-text-small); font-weight: 650; color: var(--c-text-2); text-align: center; }
.htmlLesson .case-flow-list { list-style: none; padding: 0; display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 4px; margin-top: 12px; }
.htmlLesson .case-flow-list li { margin: 0; display: inline-flex; align-items: center; gap: 4px; padding: 6px 12px; border-radius: var(--ag-radius-pill); background: var(--c-surface); box-shadow: var(--c-ring); font-size: var(--ag-text-small); line-height: 20px; }
.htmlLesson .case-flow-list li + li { margin-top: 0; }
.htmlLesson .case-flow-list li:not(:last-child)::after { content: '→'; margin-left: 8px; color: var(--c-text-3); }
.htmlLesson .video-frame video { width: 100%; border-radius: var(--ag-radius-md); background: #000; display: block; }
.htmlLesson .video-frame figcaption { display: grid; gap: 4px; text-align: left; }
.htmlLesson .video-frame figcaption span:first-child { font-weight: 650; color: var(--c-text-2); }
.htmlLesson .lightbox { position: fixed; inset: 0; z-index: 70; display: none; place-items: center; padding: 24px; margin: 0; background: rgb(10 20 16 / 0.86); }
.htmlLesson .lightbox.open { display: grid; }
.htmlLesson .lightbox img { max-width: min(1200px, 100%); max-height: calc(100svh - 48px); border-radius: var(--ag-radius-sm); background: #fff; cursor: zoom-out; }
.htmlLesson .lightbox-close { position: absolute; top: 16px; right: 16px; width: 44px; height: 44px; border-radius: 50%; background: rgb(255 255 255 / 0.14); color: #fff; font-size: 28px; line-height: 1; }

/* End of a section: read mark, pager, product card */
.lesson-end { display: grid; grid-template-columns: minmax(0, 1fr); gap: 24px; margin-top: 48px; padding-top: 32px; border-top: 1px solid var(--c-line); }
.done-line { display: flex; align-items: center; gap: 10px; font-size: var(--ag-text-small); color: var(--c-text-3); }
.done-line .st { width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; box-shadow: inset 0 0 0 1.5px var(--c-line-strong); color: transparent; }
.done-line .st svg { width: 13px; height: 13px; stroke-width: 2.5; }
.done-line.is-done { color: var(--c-text-2); }
.done-line.is-done .st { background: var(--c-accent); color: var(--c-btn-text); box-shadow: none; }
.reader-pager:empty { display: none; }
.lesson-end .cta-card { grid-template-columns: 1fr; }
.lesson-end .cta-card p { max-width: 40em; }

/* ---------- Course resources (course/start) ---------- */
.resources-page { padding-block: 48px 80px; }
.resources-page .reader-head { display: grid; gap: 12px; padding-bottom: 28px; margin-bottom: 32px; border-bottom: 1px solid var(--c-line); }
.resources-page .reader-meta { color: var(--c-text-3); font-size: var(--ag-text-small); }
.resource-layout { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 48px; align-items: start; }
.resource-main h2 { font-size: var(--ag-text-heading); line-height: var(--ag-leading-heading); font-weight: 650; margin-bottom: 16px; }
.resource-main h2:not(:first-child) { margin-top: 48px; }
.resource-chapters { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.resource-chapter { display: grid; gap: 4px; padding: 20px; border-radius: var(--ag-radius-md); background: var(--c-surface); box-shadow: var(--c-raised); color: var(--c-text); transition: box-shadow var(--ag-dur) var(--ag-ease-out), transform var(--ag-dur) var(--ag-ease-out); }
.resource-chapter:hover { box-shadow: var(--c-floating); transform: translateY(calc(var(--ag-lift) * 2)); }
.resource-chapter .num { font: 600 28px/1 var(--ag-font-display); color: var(--c-gold-text); margin-bottom: 8px; }
.resource-chapter strong { font-size: var(--ag-text-title); line-height: var(--ag-leading-title); font-weight: 650; }
.resource-chapter span:last-child { font-size: var(--ag-text-small); color: var(--c-text-3); }
.resource-files { display: grid; gap: 10px; }
.resource-file { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 16px; align-items: center; padding: 16px 20px; border-radius: var(--ag-radius-md); background: var(--c-surface); box-shadow: var(--c-raised); color: var(--c-text); }
.resource-file:hover { box-shadow: var(--c-floating); }
.file-badge { display: grid; place-items: center; width: 48px; height: 48px; border-radius: 10px; background: var(--c-tint); color: var(--c-accent); font-size: var(--ag-text-caption); font-weight: 700; }
.file-badge.xls { background: var(--ag-gold-50); color: var(--c-gold-text); }
.resource-file > span:nth-child(2) { display: grid; gap: 2px; }
.resource-file > span:nth-child(2) strong { font-size: var(--ag-text-body); font-weight: 650; }
.resource-file > span:nth-child(2) span { font-size: var(--ag-text-small); color: var(--c-text-3); }
.resource-file .arrow { color: var(--c-accent); font-weight: 700; }
.resource-side { display: grid; gap: 16px; position: sticky; top: calc(var(--hd-height) + 24px); }
.resource-side h2 { font-size: var(--ag-text-title); }
.resource-side p { font-size: var(--ag-text-small); line-height: var(--ag-leading-small); color: var(--c-text-2); }
.resource-side .actions { margin-top: 14px; }

/* ---------- Login ---------- */
.gate { display: grid; place-items: center; padding-block: 64px 96px; min-height: calc(100svh - var(--hd-height) - 240px); }
.gate-card { width: 100%; max-width: 460px; padding: 36px; background: var(--c-surface); border-radius: var(--ag-radius-md); box-shadow: var(--c-raised); display: grid; gap: 0; }
.gate-card .overline { margin-bottom: 12px; }
.gate-card h1 { margin-bottom: 8px; }
.gate-card .lead { color: var(--c-text-2); font-size: var(--ag-text-body); margin-bottom: 8px; }
.gate-alt { margin-bottom: 24px; font-size: var(--ag-text-small); }
.gate-alt .text-link { font-size: var(--ag-text-small); }
.gate-btn { display: inline-flex; align-items: center; justify-content: center; width: 100%; height: 48px; border: 0; border-radius: var(--ag-radius-sm); background: var(--c-btn); color: var(--c-btn-text); font: 600 var(--ag-text-body)/1 var(--ag-font-sans); cursor: pointer; text-decoration: none; box-shadow: 0 1px 2px rgb(11 61 46 / 0.24); }
.gate-btn:hover { background: var(--c-btn-hover); }
.gate-btn:disabled { opacity: 0.6; cursor: wait; }
.gate-card .gate-sso { margin-bottom: 4px; }
.gate-divider { margin: 20px 0 12px; color: var(--c-text-3); font-size: var(--ag-text-small); text-align: center; display: flex; align-items: center; gap: 12px; }
.gate-divider::before, .gate-divider::after { content: ''; flex: 1; height: 1px; background: var(--c-line); }
.tabs { display: flex; gap: 4px; padding: 4px; border-radius: var(--ag-radius-sm); background: var(--c-muted); margin-bottom: 20px; }
.tabs button { flex: 1; height: 40px; border-radius: 6px; font-size: var(--ag-text-small); font-weight: 600; color: var(--c-text-2); }
.tabs button.active { background: var(--c-surface); color: var(--c-text); box-shadow: var(--c-raised); }
.gate-field { display: grid; gap: 6px; margin-bottom: 14px; }
.gate-field > span, .gate-field-head label { font-size: var(--ag-text-small); font-weight: 600; color: var(--c-text); }
.gate-field input { width: 100%; height: 46px; font-size: var(--ag-text-body); }
.gate-field-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.get-code { display: inline-flex; align-items: center; gap: 4px; font-size: var(--ag-text-small); color: var(--c-accent); font-weight: 600; }
.get-code svg { width: 14px; height: 14px; fill: none; stroke: currentColor; stroke-width: 1.75; }
.gate-msg { min-height: 22px; margin-top: 10px; font-size: var(--ag-text-small); color: var(--c-text-3); }
.gate-msg.ok { color: var(--c-good); }
.gate-msg.err { color: var(--c-bad); }
.gate-note { margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--c-line); font-size: var(--ag-text-caption); color: var(--c-text-3); text-align: center; }
.preview-entry { width: 100%; margin-top: 16px; }
.hide { display: none !important; }

/* ---------- Free self-test (its own assessment.css stays; these align it with the site) ---------- */
.assessment-page main { padding-block: 32px 64px; }
.assessment-page #app h1 { font-family: var(--ag-font-display); font-weight: 600; font-synthesis-weight: none; font-size: var(--ag-text-display-2); line-height: var(--ag-leading-display-2); }
.assessment-page #app h2 { font-size: var(--ag-text-title); font-weight: 650; }
.assessment-page #app .panel { box-shadow: var(--c-raised); border: 0; }
.assessment-page #app .option { display: grid; grid-template-columns: 32px minmax(0, 1fr); gap: 14px; align-items: center; position: relative; padding: 10px 16px; border-radius: var(--ag-radius-md); background: var(--c-surface); box-shadow: inset 0 0 0 1px var(--c-line-strong); cursor: pointer; margin-top: 10px; border: 0; }
.assessment-page #app .option input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.assessment-page #app .option:focus-within { outline: var(--ag-focus-width) solid var(--ag-focus-color); outline-offset: 2px; }
.assessment-page #app .option.selected { background: var(--c-accent-soft); box-shadow: inset 0 0 0 1.5px var(--c-accent); }
.assessment-page #app .letter { width: 32px; height: 32px; border-radius: 50%; display: grid; place-items: center; background: var(--c-muted); font-size: var(--ag-text-small); font-weight: 700; color: var(--c-text-2); }
.assessment-page #app .option.selected .letter { background: var(--c-btn); color: var(--c-btn-text); }
.assessment-page .study-toolbar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; padding-bottom: 16px; margin-bottom: 20px; border-bottom: 1px solid var(--c-line); }
.assessment-page .toolbar-info { display: flex; align-items: center; gap: 12px; min-width: 0; }
.assessment-page .question-layout { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: var(--ag-gutter); align-items: start; }
.assessment-page .question { padding: 28px 32px; background: var(--c-surface); border-radius: var(--ag-radius-md); box-shadow: var(--c-raised); }
.assessment-page .question-sidebar { display: grid; gap: 12px; padding: 20px; background: var(--c-surface); border-radius: var(--ag-radius-md); box-shadow: var(--c-raised); position: sticky; top: calc(var(--hd-height) + 24px); }
.assessment-page .answer-grid { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 6px; }
.assessment-page .answer-grid button { height: 34px; border-radius: 6px; box-shadow: inset 0 0 0 1px var(--c-line); font-size: var(--ag-text-caption); font-weight: 600; color: var(--c-text-2); }
.assessment-page .answer-grid button.answered { background: var(--c-accent-soft); color: var(--c-accent); box-shadow: none; }
.assessment-page .answer-grid button.current { box-shadow: inset 0 0 0 2px var(--c-text); }
.assessment-page .drawer-scrim, .assessment-page .drawer-close { display: none; }
.assessment-note { padding-block: 0 32px; font-size: var(--ag-text-caption); color: var(--c-text-3); text-align: center; }

/* ---------- Responsive ---------- */
@media (max-width: 1279px) {
  .lesson-layout { grid-template-columns: 240px minmax(0, var(--rd-measure)); justify-content: start; }
  .lesson-rail { display: none; }
}
@media (max-width: 1100px) {
  .fde-hero { grid-template-columns: minmax(0, 1fr) 360px; gap: 32px; }
  .promo { grid-template-columns: 1fr; }
  .pr-bar { grid-template-columns: auto minmax(0, 1fr) 180px auto; }
  .stats-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px 0; }
  .stat:nth-child(3) { padding-left: 0; box-shadow: none; }
  .stat-review { margin-left: 24px; }
  .module-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .exam-top { grid-template-columns: 1fr; }
  .exam-overview { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
@media (max-width: 1023px) {
  .lesson-layout { grid-template-columns: minmax(0, 1fr); justify-content: center; padding-top: 16px; }
  .lesson-side { display: none; }
  .pr-grid { grid-template-columns: minmax(0, 1fr); }
  .pr-side { position: static; }
  .resource-layout { grid-template-columns: 1fr; }
  .resource-side { position: static; }
  .account-layout { grid-template-columns: 1fr; }
  .assessment-page .question-layout { grid-template-columns: 1fr; }
  .assessment-page .question-sidebar { position: static; }
  .lesson-page .ft { padding-bottom: 96px; }
}
@media (min-width: 1024px) {
  .lesson-page .rbar { display: none; }
}
@media (max-width: 860px) {
  .fde-hero { grid-template-columns: 1fr; padding-block: 32px 24px; gap: 24px; }
  .ch-grid { grid-template-columns: 1fr; }
  .res-row { grid-template-columns: 1fr; padding-block: 48px 8px; gap: 12px; }
  .exam-paper-list { grid-template-columns: 1fr; }
  .exam-rules-content { grid-template-columns: 1fr; }
  .module-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .resource-chapters { grid-template-columns: 1fr; }
  .round-stats { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 720px) {
  body.has-tabbar { padding-bottom: 68px; }
  body.has-tabbar.is-answering { padding-bottom: 76px; }
  .tabbar { display: block; }
  body.is-answering .tabbar { display: none; }
  .hd-tools .account { display: none; }
  .page-head { padding-block: 28px 20px; }
  .page-heading { padding-block: 28px 16px; }
  .intro { padding-block: 28px 12px; }
  .fde-hero-main { gap: 14px; }
  .resume { padding: 20px; }
  .resume .btn { justify-self: stretch; }
  .stats { padding: 20px; margin-bottom: 48px; }
  .stats-grid { grid-template-columns: 1fr; gap: 18px; }
  .stat, .stat:nth-child(3) { padding: 0; box-shadow: none; }
  .stat + .stat:not(.stat-review) { padding-top: 18px; box-shadow: inset 0 1px 0 var(--c-line); }
  .stat-review { margin: 4px 0 0; padding: 16px; display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 4px 12px; }
  .stat-review .stat-label { grid-column: 1; }
  .stat-review .figure { grid-column: 1; }
  .stat-review .stat-sub { grid-column: 1; }
  .stat-review .btn { grid-column: 2; grid-row: 1 / span 3; }
  .ch { padding: 4px 4px 8px; }
  .ch-head { grid-template-columns: auto minmax(0, 1fr); padding: 14px 12px 12px; }
  .ch-prog { grid-column: 1 / -1; grid-template-columns: minmax(0, 1fr) auto; align-items: center; justify-items: stretch; }
  .ch-prog span { order: 2; }
  .sec { padding: 8px 10px; gap: 10px; }
  .promo { padding: 28px 20px; gap: 28px; }
  .exam-launch { grid-template-columns: 1fr; padding: 20px; }
  .exam-launch-go { justify-items: stretch; text-align: left; }
  .exam-launch-go .btn { width: 100%; }
  .exam-overview { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .exam-overview div { padding: 12px 14px; }
  .exam-list { padding-top: 40px; }
  .exam-list .section-head-row { align-items: start; flex-direction: column; }
  .exam-paper-row { grid-template-columns: auto minmax(0, 1fr); padding: 14px 16px; }
  .exam-paper-actions { grid-column: 1 / -1; justify-content: flex-end; }
  .result-top { grid-template-columns: 1fr; justify-items: start; gap: 20px; }
  .score-ring { --size: 120px; }
  .practice { padding-top: 12px; }
  .pr-bar { grid-template-columns: auto minmax(0, 1fr) auto; gap: 8px 12px; padding-bottom: 14px; margin-bottom: 16px; }
  .pr-count { order: 5; grid-column: 1 / -1; grid-template-columns: auto minmax(0, 1fr); align-items: center; gap: 12px; }
  .toolbar-controls { gap: 4px; }
  .toolbar-controls .switch span { display: none; }
  .toolbar-controls .btn { height: 36px; padding: 0 12px; }
  .exam-clock { height: 36px; padding: 0 10px; }
  .q { padding: 20px 16px; border-radius: var(--ag-radius-md); }
  .q-meta .topic { order: 5; flex-basis: 100%; margin: 2px 0 0; }
  .q-tools { margin-right: -8px; }
  .q-stem { font-size: var(--ag-text-lead); line-height: 1.7; margin-top: 12px; }
  .opt { grid-template-columns: 28px minmax(0, 1fr); gap: 12px; padding: 10px 12px; }
  .opt .l { width: 28px; height: 28px; }
  .opt .s { grid-column: 2; margin-top: -4px; }
  .q-actions { display: none; }
  .abar { display: block; }
  .pr-side > .side-cta { margin-top: 0; }
  /* Answer card drawer */
  .question-sidebar { display: none; }
  .answer-drawer-open .question-sidebar { display: grid; position: fixed; left: 0; right: 0; top: auto; bottom: 0; z-index: 41; align-content: start; max-height: 78svh; overflow: auto; gap: 12px;
    padding: 8px 16px calc(16px + env(safe-area-inset-bottom)); background: var(--c-surface); border-radius: var(--ag-radius-lg) var(--ag-radius-lg) 0 0; box-shadow: var(--c-overlay); }
  .answer-drawer-open .drawer-scrim { display: block; position: fixed; inset: 0; z-index: 40; background: var(--c-scrim); border: 0; }
  .answer-drawer-open .drawer-head { display: flex; align-items: center; justify-content: center; position: relative; min-height: 28px; }
  .answer-drawer-open .drawer-head .sheet-grip { margin: 4px auto; }
  .answer-drawer-open .drawer-close { position: absolute; right: -8px; top: -4px; }
  .answer-drawer-open .question-sidebar .ac-box { padding: 0; box-shadow: none; }
  .answer-drawer-open .question-sidebar .side-cta { display: none; }
  .answer-drawer-open { overflow: hidden; }
  .module-grid { grid-template-columns: 1fr; }
  .module-card strong { min-height: 0; }
  .resume-strip { grid-template-columns: 1fr; padding: 18px; }
  .resume-strip .btn { width: 100%; }
  .learning-tabs { width: 100%; }
  .learning-tabs { flex-wrap: nowrap; }
  .learning-tabs a { flex: 1 1 auto; justify-content: center; gap: 4px; padding: 0 6px; white-space: nowrap; }
  .account-grid { grid-template-columns: 1fr; }
  .panel { padding: 20px; }
  .round-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lesson-layout { padding-top: 8px; }
  .lesson-head { margin-bottom: 24px; padding-bottom: 20px; gap: 10px; }
  .htmlLesson .chapter-meta { padding: 16px 16px 16px 0; gap: 0 12px; }
  .htmlLesson .ix-block, .htmlLesson .quiz { padding: 16px; }
  .htmlLesson .ix-flow, .htmlLesson .ix-tabs { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .htmlLesson .quiz-options { grid-template-columns: 1fr; }
  .htmlLesson .ix-form { grid-template-columns: 1fr; }
  .htmlLesson .prompt-box { padding: 48px 16px 16px; }
  .gate { padding-block: 24px 48px; }
  .gate-card { padding: 24px 20px; }
  .resources-page { padding-block: 28px 56px; }
  .resource-file { grid-template-columns: auto minmax(0, 1fr); }
  .resource-file .arrow { display: none; }
  .assessment-page .question { padding: 20px 16px; }
  .assessment-page .answer-grid { grid-template-columns: repeat(7, minmax(0, 1fr)); }
  .error-card { padding: 24px 20px; }
}

/* Free self-test entry: one card, the start button beside the title */
.assessment-page #app .selftest-entry { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 24px 48px; align-items: center; margin: 32px 0 48px; padding: 40px; border: 0; border-radius: var(--ag-radius-md); background: var(--c-surface); box-shadow: var(--c-raised); }
.assessment-page #app .entry-subject { display: flex; align-items: center; gap: 10px; margin: 0 0 12px; font-size: var(--ag-text-caption); font-weight: 600; letter-spacing: 0.04em; color: var(--c-text-3); }
.assessment-page #app .entry-subject::before { content: ''; width: 24px; height: 1px; background: var(--c-gold-rule); }
.assessment-page #app .entry-count { margin: 16px 0 0; padding: 0 10px; height: 26px; border: 0; border-radius: var(--ag-radius-xs); background: var(--c-accent-soft); color: var(--c-accent); font-size: var(--ag-text-caption); font-weight: 600; }
.assessment-page #app .selftest-entry .actions { margin: 0; padding: 0; border: 0; display: grid; gap: 10px; }
.assessment-page #app .selftest-entry .actions button { width: 100%; min-height: 48px; font-size: var(--ag-text-body); }
@media (max-width: 720px) {
  .assessment-page #app .selftest-entry { grid-template-columns: 1fr; padding: 24px 20px; margin: 16px 0 32px; }
}

/* Under 360px (320px phones):
   - free self-test: the question buttons (上一题 · 标记本题 · 下一题 · 答题卡) wrap into a 2-column grid under the title
     instead of running off the screen; each keeps its visible words as its label;
   - 「去用 WorkBuddy 自定义模型」 buttons and the home band title fit inside their cards (they poked out 3-15px). */
@media (max-width: 359px) {
  .assessment-page .toolbar-controls { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; width: 100%; }
  .assessment-page .toolbar-controls > button { width: 100%; min-width: 0; padding-inline: 8px; }
  .cta-actions .btn { padding-inline: 12px; gap: 6px; font-size: 15px; }
  .promo .display { font-size: 26px; }
}