:root {
  color-scheme: light;
  --canvas: #f8f5ef;
  --surface: #fffdfa;
  --ink: #241a38;
  --muted: #665b75;
  --line: #e8e0e9;
  --accent: #5837c7;
  --accent-dark: #3e249b;
  --accent-soft: #f1ebfe;
  --accent-line: #bda9ec;
  --correct: #2c418e;
  --correct-soft: #edf0ff;
  --correct-line: #bec9f1;
  --wrong: #8e392c;
  --wrong-soft: #fff0e8;
  --wrong-line: #efc7b8;
  --peach: #ffcf9f;
  --shadow: 0 3px 6px #2a163705, 0 12px 32px #2a163707;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--canvas);
}

* { box-sizing: border-box; }
body { margin: 0; line-height: 1.6; }
button, input, select, textarea { font: inherit; }
button, select, summary, .import-control { cursor: pointer; }
button:disabled { cursor: default; }
button, input, select, textarea, summary { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
[tabindex="-1"]:focus { outline: none; }
[hidden] { display: none !important; }
h1, h2, p { margin: 0; }

.sr-only, .import-control > input, .option > input {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.site-header { background: var(--surface); border-bottom: 1px solid var(--line); }
.site-header { padding-top: env(safe-area-inset-top, 0px); }
.site-bar, .page {
  --gutter: clamp(12px, 3vw, 24px);
  --centered: calc((100% - 1120px) / 2);
  margin-left: max(var(--gutter), var(--centered), env(safe-area-inset-left, 0px));
  margin-right: max(var(--gutter), var(--centered), env(safe-area-inset-right, 0px));
}
.site-bar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
  min-height: 72px;
}
.brand, .site-nav, .import-control { display: flex; align-items: center; }
.brand { gap: .65rem; font-size: 1.05rem; font-weight: 780; white-space: nowrap; }
.brand-mark {
  display: grid;
  place-items: center;
  flex: 0 0 38px;
  height: 38px;
  color: white;
  background: linear-gradient(145deg, #7656dd, var(--accent-dark));
  border-radius: 11px;
  box-shadow: 0 3px 8px #5837c735;
}
.brand-mark svg { width: 23px; height: 23px; }
.site-nav { gap: .25rem; padding: .25rem; border-radius: 12px; background: var(--canvas); }
.site-nav button {
  min-height: 39px;
  padding: .25rem .95rem;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: var(--muted);
  font-weight: 680;
  white-space: nowrap;
}
.site-nav button:hover { color: var(--accent-dark); }
.site-nav button[aria-pressed="true"] {
  background: var(--surface);
  color: var(--accent-dark);
  box-shadow: 0 1px 4px #3822541a;
}
.import-control { position: relative; justify-self: end; gap: .4rem; white-space: nowrap; }
.import-control svg { width: 18px; height: 18px; }
.import-control:focus-within { outline: 3px solid var(--accent); outline-offset: 3px; }
.page { min-width: 0; padding-block: clamp(1rem, 3vw, 1.9rem) max(1.5rem, env(safe-area-inset-bottom, 0px)); }
#screen, #screen form, #screen fieldset { min-width: 0; }
#screen :is(input, textarea, select, img, svg) { max-width: 100%; }
#screen :is(pre, code) { overflow-wrap: anywhere; }
#screen pre { white-space: pre-wrap; }
#screen table { width: 100%; table-layout: fixed; overflow-wrap: anywhere; }
#notice:not(:empty) {
  padding: .7rem 1rem;
  margin-bottom: 1rem;
  border: 1px solid var(--accent-line);
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--accent-dark);
  overflow-wrap: anywhere;
}
.site-footer { padding-top: 1.25rem; color: var(--muted); font-size: .8rem; }

.study-heading {
  position: relative;
  isolation: isolate;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(180px, 236px);
  gap: clamp(1rem, 4vw, 3.2rem);
  align-items: center;
  overflow: hidden;
  margin-bottom: 1.15rem;
  padding: clamp(1.25rem, 3.4vw, 2.25rem);
  border-radius: 22px;
  color: #fffaf5;
  background: radial-gradient(ellipse at 105% 110%, #6141a9, transparent 65%),
    linear-gradient(115deg, #241841, #39245e);
  box-shadow: 0 10px 28px #36225320;
}
.study-heading::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0;
  opacity: .22;
  background: repeating-radial-gradient(circle at 93% 128%, transparent 0 24px, #e2ceff 25px, transparent 26px 50px);
  mask-image: linear-gradient(to right, transparent 45%, #000);
  pointer-events: none;
}
.study-intro { min-width: 0; overflow-wrap: anywhere; }
.study-kicker {
  display: flex;
  gap: .6rem;
  align-items: center;
  color: var(--peach);
  font-size: .77rem;
  font-weight: 760;
  letter-spacing: .13em;
}
.study-kicker::before { content: ""; width: 20px; height: 2px; border-radius: 2px; background: currentColor; }
.study-heading h1 { margin-top: .25rem; font-size: clamp(1.8rem, 3.8vw, 2.8rem); line-height: 1.16; letter-spacing: -.035em; }
.study-description { margin-top: .6rem; color: #e9def6; font-size: .92rem; }
.study-progress {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: .55rem .65rem;
  align-items: center;
  padding: .9rem 1rem;
  border: 1px solid #fff4;
  border-radius: 15px;
  background: #fff1;
}
.study-progress-label { display: flex; flex-wrap: wrap; gap: .2rem .42rem; align-items: center; color: #f7edff; font-size: .79rem; font-weight: 650; }
.study-progress-count { font-size: 1.35rem; line-height: 1.15; font-variant-numeric: tabular-nums; }
.study-progress-count small { color: #e9def6; font-size: .78rem; font-weight: 550; }
.study-progress progress {
  grid-column: 1 / -1;
  margin: 0;
  height: 7px;
  accent-color: var(--peach);
  --progress-track: #ffffff30;
  --progress-fill: var(--peach);
}
.milestone { padding-inline: .35rem; border-radius: 999px; background: #ffcf9f25; color: var(--peach); font-size: .72rem; font-weight: 680; }

.workspace {
  display: grid;
  grid-template-columns: 248px minmax(0, 1fr);
  grid-template-areas: "sidebar main";
  align-items: start;
  gap: 1.15rem;
}
.side-panel, .main-panel {
  min-width: 0;
  overflow-wrap: anywhere;
  border: 1px solid var(--line);
  border-radius: 19px;
  background: var(--surface);
  box-shadow: var(--shadow);
}
.side-panel { grid-area: sidebar; padding: 1.1rem; }
.main-panel { grid-area: main; padding: clamp(1.1rem, 3.6vw, 2rem); }
.bank-label, .section-title { font-size: .91rem; font-weight: 760; }
.bank-label { display: block; margin-bottom: .4rem; }
select, textarea, .ai-settings input:not([type="checkbox"]) {
  width: 100%;
  min-height: 43px;
  padding: .45rem .6rem;
  border: 1px solid var(--line);
  border-radius: 9px;
  color: var(--ink);
  background: var(--surface);
}
.summary, .meta, .review-note, .review-meta { color: var(--muted); font-size: .9rem; }
.summary { margin-top: .55rem; white-space: pre-line; }
.stats { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .55rem; margin-top: .85rem; }
.stat { padding: .58rem .65rem; border-radius: 10px; background: var(--canvas); }
.stat strong, .stat span { display: block; }
.stat strong { font-size: 1.25rem; line-height: 1.25; font-variant-numeric: tabular-nums; }
.stat small, .stat span { color: var(--muted); font-size: .77rem; }
.stat span { margin-top: .22rem; }
progress {
  display: block;
  width: 100%;
  height: 6px;
  margin-top: .85rem;
  appearance: none;
  border: 0;
  border-radius: 10px;
  accent-color: var(--accent);
  background: var(--progress-track, var(--accent-soft));
}
progress::-webkit-progress-bar { background: var(--progress-track, var(--accent-soft)); border-radius: 10px; }
progress::-webkit-progress-value { background: var(--progress-fill, var(--accent)); border-radius: 10px; }
progress::-moz-progress-bar { background: var(--progress-fill, var(--accent)); border-radius: 10px; }
.section-title { margin-block: 1.15rem .5rem; }
.section-title > span { color: var(--muted); margin-inline-start: .25rem; font-weight: 550; }
.question-map {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(36px, 1fr));
  gap: 5px;
  max-height: 16rem;
  overflow: auto;
  padding: 4px;
  margin: -4px;
}
.number-button {
  min-height: 38px;
  padding: 0 .15rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--muted);
  font-size: .81rem;
  font-variant-numeric: tabular-nums;
}
.number-button:hover { border-color: var(--accent); }
.number-button.is-done { background: var(--correct-soft); color: var(--correct); }
.number-button.is-wrong { background: var(--wrong-soft); color: var(--wrong); }
.number-button.is-current { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); color: var(--accent-dark); font-weight: 760; }

.question-head { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem; margin-bottom: .65rem; }
.eyebrow { color: var(--accent-dark); font-size: .83rem; font-weight: 780; }
.eyebrow span { margin-left: .3rem; font-variant-numeric: tabular-nums; }
.tag, .review-status {
  padding: .12rem .54rem;
  border-radius: 999px;
  color: var(--accent-dark);
  background: var(--accent-soft);
  font-size: .76rem;
  font-weight: 660;
}
.tag + .tag { color: #73421b; background: #faecdb; }
.main-panel #panel-title { font-size: clamp(1.35rem, 3vw, 1.85rem); line-height: 1.43; letter-spacing: -.02em; }
.question-text, .option-text, .explanation { white-space: pre-wrap; overflow-wrap: anywhere; }
.meta { margin-top: .55rem; }
.options { display: grid; gap: .56rem; min-width: 0; margin: 1.1rem 0 0; padding: 0; border: 0; }
.option {
  position: relative;
  display: flex;
  align-items: center;
  gap: .72rem;
  min-height: 54px;
  padding: .58rem .75rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  cursor: pointer;
}
.option-text { min-width: 0; }
.option:has(input:enabled):hover { border-color: var(--accent-line); background: #faf7ff; }
.option:has(input:disabled) { cursor: default; }
.option:has(input:focus-visible) { outline: 3px solid var(--accent); outline-offset: 3px; }
.option:has(input:checked:enabled) { border-color: var(--accent); background: var(--accent-soft); box-shadow: inset 0 0 0 1px var(--accent); }
.option.is-correct { border-color: var(--correct-line); background: var(--correct-soft); }
.option.is-wrong { border-color: var(--wrong-line); background: var(--wrong-soft); }
.option-key {
  display: grid;
  place-items: center;
  flex: 0 0 31px;
  height: 31px;
  border-radius: 8px;
  color: var(--accent-dark);
  background: #f2edf7;
  font-size: .82rem;
  font-weight: 780;
}
.option > input:checked:enabled ~ .option-key { color: white; background: var(--accent); animation: key-pick .22s ease-out; }
.option.is-correct .option-key { color: white; background: var(--correct); }
.option.is-wrong .option-key { color: white; background: var(--wrong); }
.option-picked, .option-result {
  margin-inline-start: auto;
  padding: .14rem .48rem;
  border-radius: 999px;
  color: var(--accent-dark);
  background: #fff9;
  font-size: .74rem;
  font-weight: 700;
  white-space: nowrap;
}
.option-picked { display: none; }
.option > input:checked:enabled ~ .option-picked { display: inline-block; }
.option.is-correct .option-result { color: var(--correct); }
.option.is-wrong .option-result { color: var(--wrong); }
.guess { display: inline-flex; align-items: center; gap: .42rem; margin-top: .7rem; min-height: 40px; color: var(--muted); font-size: .89rem; cursor: pointer; }
.guess:has(input:checked) { color: var(--accent-dark); }
.guess input { width: 17px; height: 17px; accent-color: var(--accent); }

.actions { display: flex; flex-wrap: wrap; gap: .58rem; margin-top: 1rem; }
.button {
  min-height: 44px;
  padding: .45rem .9rem;
  border: 1px solid transparent;
  border-radius: 10px;
  font-size: .89rem;
  font-weight: 730;
}
.button.primary { background: var(--accent); color: white; box-shadow: 0 3px 0 var(--accent-dark); }
.button.primary:hover:enabled { background: #4b2eb3; }
.button.secondary { border-color: var(--line); background: var(--surface); color: var(--accent-dark); }
.button.secondary:hover:not(:disabled) { border-color: var(--accent-line); background: var(--accent-soft); }
.button:disabled { opacity: .53; }
.button.primary:disabled { box-shadow: none; }
.button, .site-nav button, .number-button, .option {
  transition: transform .13s ease, background-color .13s ease, border-color .13s ease, box-shadow .13s ease;
}
.button:active:not(:disabled), .site-nav button:active, .number-button:active, .option:has(input:enabled):active {
  transform: translateY(2px) scale(.985);
}
.button.primary:active:enabled { box-shadow: 0 1px 0 var(--accent-dark); }

.feedback, .empty, .session-complete {
  margin-top: 1rem;
  padding: .85rem 1rem;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: var(--canvas);
}
.feedback.correct { --outcome: var(--correct); background: var(--correct-soft); border-color: var(--correct-line); }
.feedback.incorrect { --outcome: var(--wrong); background: var(--wrong-soft); border-color: var(--wrong-line); }
.feedback-heading, .session-complete { display: flex; gap: .72rem; align-items: center; }
.feedback-heading strong, .feedback > strong { color: var(--outcome, var(--accent-dark)); font-size: 1.06rem; }
.feedback-icon, .session-mark {
  display: grid;
  place-items: center;
  flex: 0 0 36px;
  height: 36px;
  border-radius: 11px;
  color: #fff;
  background: var(--outcome, var(--accent));
  font-size: 1.15rem;
  font-weight: 760;
}
.feedback p, .empty p { margin-top: .32rem; }
.feedback p.feedback-detail { margin: .04rem 0 0; color: var(--muted); font-size: .82rem; }
.feedback.just-submitted, .session-complete.just-submitted { animation: feedback-in .25s ease-out both; }
.feedback.just-submitted.correct .feedback-icon { animation: key-pick .33s ease-out; }
.session-complete, .empty.review-complete { border-color: #edd3ae; background: #fff6e8; }
.session-complete { margin-top: .75rem; color: #714019; }
.session-mark { color: #714019; background: #f7dcba; }
.session-complete p { font-size: .89rem; }
.empty h2, .empty h3 { font-size: 1.06rem; }
.empty p { color: var(--muted); }
.empty .button { margin-top: .85rem; }
.review-list { display: grid; gap: .55rem; margin: 0; padding: 0; list-style: none; }
.review-item { display: flex; gap: .75rem; justify-content: space-between; align-items: center; padding: .7rem .85rem; border: 1px solid var(--line); border-radius: 11px; }
.review-item .button { flex: none; }
.review-meta { margin-bottom: .15rem; }
.review-tools { margin-top: 1.05rem; padding: .7rem .85rem; border: 1px solid var(--line); border-radius: 11px; background: var(--canvas); }
.review-tools summary { color: var(--accent-dark); font-weight: 700; }
.review-tools h3 { margin: 1rem 0 .3rem; font-size: .95rem; }
.review-tools .actions { margin-top: .6rem; }
.ai-settings { display: grid; gap: .65rem; margin-top: .5rem; }
.ai-settings label, .review-paste { font-size: .9rem; font-weight: 650; }
.ai-settings label input { margin-top: .25rem; }
.review-paste { display: block; margin-block: .85rem .25rem; }
.review-tools textarea { display: block; resize: vertical; }
.review-note { margin-top: .7rem; padding: .75rem 1rem; border: 1px solid var(--line); border-radius: 11px; background: var(--canvas); }
.review-note > strong { color: var(--accent-dark); }
.review-note p { margin-top: .25rem; }

@keyframes key-pick {
  from { transform: scale(.88); }
  62% { transform: scale(1.12); }
  to { transform: scale(1); }
}

@keyframes feedback-in {
  from { opacity: .35; transform: translateY(5px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 870px) {
  .site-bar { grid-template-columns: minmax(0, 1fr) auto; row-gap: .55rem; padding-block: .55rem; }
  .site-nav { grid-row: 2; grid-column: 1 / -1; }
  .site-nav button { flex: 1; min-height: 44px; }
}

@media (max-width: 740px) {
  .workspace {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: "main" "sidebar";
    gap: .75rem;
  }
  .side-panel { padding: .85rem; }
  .question-map { max-height: 7.8rem; }
  .study-heading { border-radius: 17px; margin-bottom: .75rem; }
}

@media (max-width: 510px) {
  .site-nav { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .site-nav button { white-space: normal; }
  .brand { gap: .42rem; font-size: .98rem; }
  .brand-mark { flex-basis: 34px; height: 34px; }
  .import-control { padding-inline: .6rem; }
  .study-heading { grid-template-columns: minmax(0, 1fr); gap: .85rem; }
  .study-progress { padding: .65rem .75rem; }
}

@media (max-width: 360px) {
  .site-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (prefers-reduced-motion: reduce) {
  .button, .site-nav button, .number-button, .option { transition: none; }
  .button:active:not(:disabled), .site-nav button:active, .number-button:active, .option:has(input:enabled):active { transform: none; }
  .option > input:checked:enabled ~ .option-key, .feedback.just-submitted, .feedback.just-submitted.correct .feedback-icon,
  .session-complete.just-submitted { animation: none; }
}

/* 中台课程在原练习台组件之上复用表单、判分和反馈样式。 */
.site-nav { flex-wrap: wrap; }
.academy { width: min(100%, 970px); margin-inline: auto; display: grid; gap: 1rem; }
.academy-head { padding: clamp(.75rem,3vw,1.65rem) .2rem .3rem; }
.academy-head h1 { margin: .35rem 0 .5rem; font-size: clamp(1.65rem,4vw,2.55rem); line-height: 1.25; letter-spacing: -.035em; }
.academy-head p { margin-bottom: .2rem; }
.academy-head .study-description { color: var(--muted); }
.academy-card { min-width: 0; overflow-wrap: anywhere; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: clamp(1rem,3vw,1.6rem); }
.academy-card h2 { font-size: 1.12rem; margin: 0 0 .75rem; }
.academy-card > :last-child { margin-bottom: 0; }
.academy-card p, .academy-card li { line-height: 1.68; }
.academy-card li + li { margin-top: .32rem; }
.academy-toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: .55rem; }
.academy-grid { display: grid; gap: 1rem; grid-template-columns: repeat(2,minmax(0,1fr)); }
.course-list,.module-list,.recap-list { list-style: none; padding: 0; margin: 0 0 .75rem; }
.course-list button { width: 100%; display: flex; gap: .5rem; align-items: center; justify-content: space-between; text-align: left; border: 1px solid var(--line); color: inherit; background: var(--surface); padding: .65rem .75rem; border-radius: 8px; }
.course-list button:hover { background: var(--accent-soft); border-color: var(--accent-line); }
.course-list button small, .module-list small { display: block; color: var(--muted); }
.course-list button span:last-child { flex: none; color: var(--accent-dark); font-size: .75rem; }
.module-list > li { display: flex; gap: .55rem; align-items: center; justify-content: space-between; padding: .6rem 0; border-bottom: 1px solid var(--line); }
.module-list .button { flex: none; min-height: 1.8rem; padding: .24rem .6rem; }
.study-copy { white-space: pre-wrap; overflow-wrap: anywhere; line-height: 1.75; }
.academy-form { display: grid; gap: .65rem; align-items: start; justify-items: start; }
.academy-form label:not(.guess) { width: 100%; display: grid; gap: .25rem; }
.academy-form input:not([type=checkbox]), .academy-form select, .viz-control select { width: 100%; max-width: 26rem; border: 1px solid var(--line); background: var(--surface); color: inherit; border-radius: 7px; padding: .5rem .65rem; }
.form-error { color: #9e2c29; margin: 0; }
.form-error:empty { display: none; }
.round-panel { min-width: 0; }
.round-panel .question-text { font-size: clamp(1.12rem,2.5vw,1.54rem); }
.scratch { margin: .2rem 0 .8rem; color: var(--muted); font-size: .88rem; }
.scratch textarea { width: 100%; margin-top: .5rem; border: 1px solid var(--line); border-radius: 8px; padding: .55rem; background: var(--canvas); color: var(--ink); resize: vertical; }
.post-analysis { min-width: 0; overflow-wrap: anywhere; }
.post-analysis details { margin-top: .65rem; padding-top: .5rem; border-top: 1px solid var(--line); }
.post-analysis li { margin: .38rem 0; }
.academy summary { cursor: pointer; font-weight: 650; }
.academy details a, .academy-card a { color: var(--accent-dark); overflow-wrap: anywhere; }
.recap-list > li { border-bottom: 1px solid var(--line); padding: .75rem 0; }
.recap-list .study-copy { margin: .35rem 0; }
.module-progress { display: grid; gap: .65rem; }
.module-progress label { display: block; }
.module-progress label strong { float: right; }
.module-progress progress { display: block; margin-top: .2rem; width: 100%; }
.viz-inputs { display: flex; flex-wrap: wrap; gap: 1.5rem; margin: .75rem 0; }
.viz-control { min-width: min(100%,15rem); }
.viz-control input { display: block; width: 100%; margin: .5rem 0; accent-color: var(--accent); }
.viz-control output { color: var(--accent-dark); font-weight: 650; }
.viz-figure { margin: .5rem 0 1rem; }
.viz-figure figcaption { font-weight: 700; }
.lesson-chart { display: block; width: 100%; max-width: 700px; overflow: visible; }
.lesson-chart text { fill: var(--muted); font-size: 13px; }
.chart-grid { stroke: var(--line); }
.chart-zero { stroke: var(--muted); stroke-width: 1.4; }
.chart-cursor { stroke: var(--muted); stroke-dasharray: 5 4; }
.chart-line { stroke: #234caa; stroke-width: 2.8; }
.chart-line.series-1 { stroke: #ab4614; stroke-dasharray: 8 4; }
.chart-line.series-2 { stroke: #007462; stroke-dasharray: 3 3; }
.chart-legend { margin: 0; padding: 0; list-style: none; display: flex; gap: .85rem; flex-wrap: wrap; }
.chart-legend li + li { margin: 0; }
.chart-legend span { display: inline-block; margin-right: .35rem; border-top: 3px solid #234caa; width: 1.3rem; vertical-align: middle; }
.chart-legend .series-1 { border-top: 3px dashed #ab4614; }
.chart-legend .series-2 { border-top: 3px dotted #007462; }
.cash-flows { display: grid; gap: .45rem; }
.cash-flows > div { display: grid; grid-template-columns: 1fr auto 1fr; gap: .4rem; align-items: center; text-align: center; padding: .55rem; background: var(--canvas); border-radius: 8px; }
.cash-flows small { grid-column: 1/-1; color: var(--muted); }
.workflow-flow { display: flex; align-items: stretch; gap: .5rem; flex-wrap: wrap; list-style: none; padding: 0; }
.workflow-flow li { padding: .45rem .6rem; background: var(--canvas); border-radius: 7px; }
.workflow-flow li + li { margin-top: 0; }
.workflow-flow li[aria-current="step"] { background: var(--accent-soft); color: var(--accent-dark); font-weight: 650; }
@media (max-width: 620px) {
  .academy-grid { grid-template-columns: 1fr; }
  .site-nav { gap: 0; }
  .site-nav button { font-size: .79rem; padding-inline: .42rem; }
  .module-list li { align-items: flex-start; }
  .cash-flows > div { font-size: .82rem; }
}

.lesson-layout {
  display: grid;
  grid-template-columns: 12.5rem minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
}
.lesson-sections { display: grid; min-width: 0; gap: 1rem; }
.lesson-outline { position: sticky; top: 1rem; padding: 1rem; }
.lesson-outline ol { margin: .55rem 0; padding-inline-start: 1.4rem; }
.lesson-outline li { padding-inline-start: .15rem; font-size: .86rem; line-height: 1.5; }
.lesson-outline a, .lesson-next { text-decoration-thickness: 1px; text-underline-offset: .2em; }
.outline-finish { display: inline-block; margin-top: .45rem; font-size: .85rem; font-weight: 650; }
.lesson-section, .lesson-sections > [id] { scroll-margin-top: 1rem; }
.lesson-section:target { border-color: var(--accent-line); }
.lesson-section h2 { margin: .15rem 0 .9rem; font-size: clamp(1.23rem, 2vw, 1.52rem); line-height: 1.4; }
.reading-step { color: var(--accent-dark); font-weight: 700; font-size: .8rem; font-variant-numeric: tabular-nums; }
.academy-card .reading-paragraph, .reading-paragraph { line-height: 1.85; overflow-wrap: anywhere; }
.reading-paragraph + .reading-paragraph { margin-top: .65rem; }
.lesson-section > .reading-paragraph { max-width: 68ch; }
.lesson-next { display: inline-flex; gap: .4rem; margin-top: .8rem; font-size: .85rem; font-weight: 650; }
.lesson-actions { margin-top: 1rem; }

.reading-caution { color: #992531; font-weight: 750; }
.reading-callout {
  margin: .9rem 0;
  padding: .8rem .95rem;
  border: 1px solid #d9dfe9;
  border-inline-start: 3px solid #577597;
  border-radius: .55rem;
  background: #f4f7fb;
}
.reading-pitfall { border-color: #efd7d4; border-inline-start-color: #b84548; background: #fcf1ef; }
.reading-pitfall .reading-callout-title { color: #992531; }
.reading-callout-title { display: flex; flex-wrap: wrap; gap: .2rem .65rem; align-items: baseline; font-weight: 750; margin-bottom: .32rem; }
.reading-label { font-size: .76rem; letter-spacing: .035em; font-weight: 750; }
.reading-case .reading-label { color: #36587d; }
.reading-recall { border-color: var(--accent-line); border-inline-start-color: var(--accent); background: var(--accent-soft); }
.reading-recall summary { display: flex; flex-wrap: wrap; gap: .3rem .65rem; align-items: baseline; list-style: none; }
.reading-recall summary::-webkit-details-marker { display: none; }
.reading-recall summary::after { content: "展开"; color: var(--accent-dark); margin-inline-start: auto; font-size: .76rem; }
.reading-recall[open] summary::after { content: "收起"; }
.reading-recall .reading-label { color: var(--accent-dark); }
.reading-recall-answer { margin-top: .6rem; padding-top: .6rem; border-top: 1px solid var(--accent-line); }

.reading-math-shell { margin: .65rem 0; min-width: 0; }
.reading-math-shell:last-child { margin-bottom: 0; }
.reading-math-shell.has-overflow::after {
  content: "左右滑动查看完整公式";
  display: block;
  margin-top: .2rem;
  color: var(--muted);
  font-size: .76rem;
  text-align: end;
}
.reading-math {
  min-width: 0;
  max-width: 100%;
  overflow-x: auto;
  padding: .65rem .75rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: .5rem;
  color: var(--ink);
}
.lesson-section > .reading-math-shell .reading-math { background: #f7f5fb; }
.reading-math > .katex { display: block; width: max-content; min-width: 100%; }
.reading-math math { font-size: clamp(1.03rem, 2.05vw, 1.28rem); }
.reading-math code { white-space: pre-wrap; }

.reading-feedback { margin-top: .75rem; }
.reading-options { padding: 0; list-style: none; }
.reading-options li {
  display: grid;
  grid-template-columns: 6.8rem minmax(0, 1fr);
  gap: .4rem .8rem;
  align-items: baseline;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: .45rem;
  padding: .5rem .65rem;
}
.reading-option-status { color: #255a4f; }
.reading-option-status.is-incorrect { color: #992531; }
.worked-steps { margin-bottom: 1rem; }
.worked-steps ol { padding-inline-start: 1.45rem; }
.worked-steps li { padding-inline-start: .15rem; }
.reading-memory { margin: .45rem 0 .65rem; padding: .5rem .7rem; background: var(--accent-soft); border-radius: .45rem; }
.reading-memory > strong { color: var(--accent-dark); margin-inline-end: .4rem; }

@media (max-width: 790px) {
  .lesson-layout { grid-template-columns: minmax(0, 1fr); }
  .lesson-outline { position: static; }
}
@media (max-width: 460px) {
  .reading-options li { grid-template-columns: minmax(0, 1fr); }
  .reading-math { padding-inline: .48rem; }
  .option { display: grid; grid-template-columns: auto minmax(0, 1fr); column-gap: .65rem; row-gap: .25rem; }
  .option-key { width: 31px; }
  .option-picked, .option-result { grid-column: 2; justify-self: start; margin-inline-start: 0; }
  .review-item { flex-wrap: wrap; }
}

@media (pointer: coarse) {
  .button, .number-button, .guess, .course-list button, .site-nav button, .module-list .button { min-height: 44px; }
  .question-form .actions > .primary { min-height: 48px; }
  #screen :is(input:not([type="checkbox"], [type="radio"]), select, textarea) { font-size: max(16px, 1em); }
}


.backup-controls, .cloud-account {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem .65rem;
}
.backup-controls { margin-top: .7rem; }
#backup-preview {
  width: min(36rem, calc(100% - 2rem));
  max-height: calc(100% - 2rem);
  padding: clamp(1rem, 4vw, 1.5rem);
  overflow: auto;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
}
#backup-preview::backdrop { background: #241a3873; }
.cloud-account { padding-bottom: .25rem; }
.cloud-account .sync-label {
  position: fixed;
  z-index: 2;
  right: max(.65rem, env(safe-area-inset-right, 0px));
  bottom: max(.65rem, env(safe-area-inset-bottom, 0px));
  padding: .2rem .55rem;
  color: var(--accent-dark);
  background: var(--surface);
  border: 1px solid var(--accent-line);
  border-radius: 999px;
  box-shadow: var(--shadow);
  font-size: .8rem;
  font-weight: 700;
  pointer-events: none;
}
.cloud-account .button { font-size: .82rem; }
#cloud-sync-detail { flex: 1 0 100%; overflow-wrap: anywhere; }
#cloud-sync-detail:empty { display: none; }
.cloud-gate > * + * { margin-top: .65rem; }