:root {
  color-scheme: light;
  --paper: #f7f9f8;
  --paper-deep: #e8efee;
  --ink: #18282e;
  --ink-soft: #52666d;
  --line: #d3dfdd;
  --white: #ffffff;
  --sky: #2b687c;
  --sky-soft: #dceef2;
  --sun: #3f7890;
  --success: #2f745e;
  --danger: #a34f4f;
  --shadow: 0 8px 24px rgba(28, 52, 58, .08);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --paper: #18262b;
  --paper-deep: #22343a;
  --ink: #f5f7f4;
  --ink-soft: #c0ccce;
  --line: #3d5258;
  --white: #24373d;
  --sky: #a4d4dc;
  --sky-soft: #2d4e58;
  --sun: #8fc5d1;
  --success: #91d2b7;
  --danger: #f0aaaa;
  --shadow: 0 8px 24px rgba(0, 0, 0, .18);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: "DM Sans", sans-serif; }
button, input, a { font: inherit; }
button { cursor: pointer; }
a { color: inherit; }

.app-shell { width: min(1180px, calc(100% - 40px)); margin: auto; }
.topbar { height: 88px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.home-view .topbar { position: sticky; top: 0; z-index: 10; background: var(--paper); }
.inner-view .topbar { height: 64px; }
.inner-view .brand small, .inner-view .active-bank, .inner-view .bank-status { display: none; }
.brand { min-height: 44px; display: inline-flex; align-items: center; gap: 11px; text-decoration: none; letter-spacing: -.03em; }
.brand-mark { width: 30px; height: 30px; display: grid; place-items: center; border: 1px solid var(--sky); color: var(--sky); border-radius: 50%; font-size: 14px; }
.brand strong { display: block; font-size: 17px; line-height: 1; font-weight: 700; }
.brand small { display: block; margin-top: 4px; color: var(--ink-soft); font-size: 10px; letter-spacing: .14em; text-transform: uppercase; }
.top-actions { display: flex; align-items: center; gap: 18px; }
.active-bank { color: var(--ink-soft); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; }
.icon-button:focus-visible, button:focus-visible, a:focus-visible { outline: 2px solid var(--sun); outline-offset: 3px; }
.bank-status { color: var(--ink-soft); font-size: 12px; display: flex; align-items: center; gap: 7px; }
.bank-status i { width: 7px; height: 7px; background: var(--success); display: inline-block; border-radius: 50%; }
.icon-button { flex-shrink: 0; min-width: 44px; min-height: 44px; border: 0; background: transparent; color: var(--ink); font-size: 20px; padding: 8px; }

.main-content { min-height: calc(100vh - 150px); padding: clamp(40px, 6vw, 72px) 0 80px; }
.eyebrow { color: var(--sky); font-size: 11px; font-weight: 700; letter-spacing: .17em; text-transform: uppercase; }
h1, h2, h3, p { margin-top: 0; }
h1, h2 { font-family: Newsreader, Georgia, serif; font-weight: 500; letter-spacing: -.035em; text-wrap: balance; }
h1 { max-width: 720px; margin-bottom: 28px; font-size: clamp(48px, 8vw, 94px); line-height: .93; }
h2 { font-size: clamp(38px, 5vw, 64px); line-height: .95; margin-bottom: 16px; }
.lede { max-width: 570px; color: var(--ink-soft); font-size: 17px; line-height: 1.65; text-wrap: pretty; }

.hero { position: relative; padding-bottom: 44px; }
.hero::after { content: ""; position: absolute; right: 7%; top: 10px; width: clamp(110px, 19vw, 240px); aspect-ratio: 1; border: 1px solid var(--line); border-radius: 50%; opacity: .7; }
.hero::before { content: ""; position: absolute; right: 12%; top: 62px; width: clamp(68px, 12vw, 145px); aspect-ratio: 1; border: 1px solid var(--sky); border-radius: 50%; opacity: .5; }
.hero-copy { position: relative; z-index: 1; }
.hero-copy h1 { max-width: 650px; font-size: clamp(46px, 6.5vw, 74px); line-height: .98; }
.hero .eyebrow { margin-bottom: 20px; }
.hero-note { display: flex; align-items: center; gap: 10px; margin-top: 30px; color: var(--ink-soft); font-size: 13px; }
.hero-note span { width: 34px; height: 1px; background: var(--sun); }
.wizard-step { display: flex; align-items: center; gap: 9px; margin: 0 0 18px; color: var(--ink-soft); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; }
.wizard-step strong { color: var(--sun); font-weight: 700; }
.bank-launcher { width: min(100%, 300px); min-height: 160px; display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 20px; margin: 0 0 34px; padding: 20px 22px; border: 1px solid var(--sky); background: var(--sky-soft); color: var(--ink); text-align: left; transition: transform .2s ease, background .2s ease; }
.bank-launcher:hover { transform: translateY(-3px); background: color-mix(in srgb, var(--sky-soft) 75%, var(--white)); }
.bank-launcher small { display: block; margin-bottom: 8px; color: var(--sky); font-size: 10px; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; }
.bank-launcher strong { display: block; font-family: Newsreader, Georgia, serif; font-size: 27px; font-weight: 500; line-height: 1; }
.bank-launcher em { display: block; margin-top: 7px; color: var(--ink-soft); font-size: 11px; font-style: normal; }
.bank-launcher-arrow { color: var(--sky); font-size: 27px; }
.bank-chooser { max-width: 900px; }
.bank-chooser .action-row:not(.has-actions) { display: flex; }
.bank-chooser h1 { margin-bottom: 18px; }
.bank-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 38px; }
.bank-card { aspect-ratio: 1 / 1; min-height: 0; display: flex; flex-direction: column; justify-content: space-between; padding: 20px; border: 1px solid var(--line); background: var(--white); color: var(--ink); text-align: left; transition: transform .2s ease, border-color .2s ease, background .2s ease; }
.bank-card:hover, .bank-card.selected { transform: translateY(-4px); border-color: var(--sky); background: var(--sky-soft); }
.bank-card-code { color: var(--sun); font-size: 12px; font-weight: 700; letter-spacing: .14em; }
.bank-card strong { max-width: 170px; font-family: Newsreader, Georgia, serif; font-size: 26px; font-weight: 500; line-height: .98; }
.bank-card span:last-child { color: var(--ink-soft); font-size: 11px; }
.mode-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.mode-card { position: relative; min-height: 230px; display: flex; flex-direction: column; justify-content: space-between; padding: 23px; border: 1px solid var(--line); background: color-mix(in srgb, var(--white) 52%, transparent); text-align: left; color: var(--ink); transition: transform .25s ease, background .25s ease, border-color .25s ease; }
.mode-card:hover { transform: translateY(-5px); border-color: var(--sky); background: var(--white); }
.infinite-card { background: color-mix(in srgb, var(--sky) 8%, var(--white)); }
.infinite-card .mode-number { color: var(--sky); }
.mode-number { color: var(--sun); font-size: 12px; font-weight: 700; letter-spacing: .15em; }
.mode-card h3 { max-width: 120px; margin: 0 0 9px; font-family: Newsreader, Georgia, serif; font-size: 27px; font-weight: 500; line-height: .95; }
.mode-card p { max-width: 180px; margin: 0; color: var(--ink-soft); font-size: 12px; line-height: 1.45; }
.mode-card p b { display: block; margin-top: 8px; color: var(--sky); font-size: 11px; font-weight: 700; }
.mode-arrow { align-self: flex-end; color: var(--sky); font-size: 25px; }
.review-launcher { width: 100%; min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 24px; margin-top: 14px; padding: 16px 20px; border: 1px solid var(--sky); background: var(--sky-soft); color: var(--ink); text-align: left; }
.review-launcher strong, .review-launcher small { display: block; }
.review-launcher small { margin-top: 3px; color: var(--ink-soft); }
.home-meta { display: flex; justify-content: space-between; gap: 30px; padding-top: 30px; color: var(--ink-soft); font-size: 12px; }
.home-actions { display: flex; align-items: center; gap: 22px; }
.reset-link { color: var(--danger); }
.reset-link:hover { color: var(--sky); }

.inner-view .main-content { padding-top: 32px; }
.study-header > div { min-width: 0; }
.study-header { display: flex; justify-content: space-between; align-items: end; gap: 24px; margin-bottom: 30px; }
.study-header .eyebrow { margin-bottom: 17px; }
.study-header h1 { font-size: clamp(38px, 4.4vw, 56px); margin-bottom: 0; }
.study-header.compact { align-items: center; margin-bottom: 22px; }
.study-header.compact h1, .reading-header h1 { font-size: 36px; line-height: 1.08; letter-spacing: -.025em; }
.context-label { margin: 0 0 7px; color: var(--sky); font-size: 13px; font-weight: 700; }
.study-actions { display: flex; align-items: center; gap: 22px; }
.quiet-link { min-height: 44px; display: inline-flex; align-items: center; color: var(--ink-soft); border: 0; background: none; padding: 10px 0; text-decoration: underline; text-underline-offset: 4px; }
.progress-wrap { margin-bottom: 22px; }
.progress-label { display: flex; justify-content: space-between; margin-bottom: 9px; color: var(--ink-soft); font-size: 12px; }
.progress-track { height: 5px; background: var(--paper-deep); overflow: hidden; }
.progress-fill { height: 100%; background: var(--sky); transition: width .35s ease; }
.infinite-progress .progress-fill { background: repeating-linear-gradient(135deg, var(--sky) 0 8px, color-mix(in srgb, var(--sky) 72%, var(--paper)) 8px 16px); }
.question-layout { display: flex; flex-direction: column; gap: 16px; }
.question-layout .side-panel { order: -1; }
.question-panel { width: min(100%, 980px); margin-inline: auto; background: var(--white); border: 1px solid var(--line); padding: clamp(24px, 3.2vw, 40px); }
.question-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 18px; margin-bottom: 18px; }
.question-preferences { display: flex; align-items: center; justify-content: flex-end; gap: 10px; flex-wrap: wrap; }
.question-prompt { max-width: 72ch; }
.question-prompt.has-image { max-width: none; }
.response-zone { min-width: 0; margin: 28px 0 0; padding: 0; border: 0; }
.question-label { color: var(--sky); font-size: 12px; font-weight: 700; letter-spacing: .13em; text-transform: uppercase; }
.question-text { max-width: 68ch; margin: 0; font-family: Newsreader, Georgia, serif; font-size: 25px; font-weight: 500; line-height: 1.48; letter-spacing: -.012em; text-wrap: pretty; }
.question-image { display: block; width: min(100%, 500px); height: clamp(180px, 24vw, 280px); margin: 0 auto 22px; object-fit: contain; }
.question-prompt.has-image .question-image { width: min(100%, 760px); height: min(380px, 42vw); margin: 24px auto 0; }
.options { display: grid; gap: 9px; min-height: 145px; align-content: start; }
.option { width: 100%; min-height: 56px; display: grid; grid-template-columns: 28px minmax(0, 1fr) auto; align-items: start; gap: 10px; padding: 15px 16px; border: 1px solid var(--line); background: transparent; color: var(--ink); text-align: left; transition: border-color .2s, background .2s, transform .2s; }
.option:hover:not(:disabled) { border-color: var(--sky); transform: translateX(3px); }
.option-letter { color: var(--sun); font-size: 12px; font-weight: 700; padding-top: 2px; }
.option-text { font-size: 16px; line-height: 1.55; }
.option-state { align-self: center; color: var(--ink); font-size: 12px; font-weight: 700; white-space: nowrap; }
.option.correct { border-color: var(--success); background: color-mix(in srgb, var(--success) 12%, transparent); }
.option.wrong { border-color: var(--danger); background: color-mix(in srgb, var(--danger) 11%, transparent); }
.option:disabled { cursor: default; opacity: 1; }
.feedback { min-height: 25px; margin-top: 18px; color: var(--ink-soft); font-size: 15px; line-height: 1.5; }
.feedback.correct { color: var(--success); }
.feedback.wrong { color: var(--danger); }
.keyboard-hint { margin-top: 5px; color: var(--ink-soft); font-size: 11px; }
.auto-advance-control { min-height: 44px; display: inline-flex; align-items: center; gap: 9px; padding: 0 11px; border: 1px solid var(--line); color: var(--ink-soft); font-size: 12px; cursor: pointer; }
.auto-advance-control input { width: 18px; height: 18px; margin: 0; accent-color: var(--sky); }
.mark-review { min-height: 44px; border: 0; background: transparent; color: var(--sky); padding: 8px 10px; font-size: 12px; font-weight: 700; text-decoration: underline; text-underline-offset: 3px; }
.mark-review.is-marked { background: var(--sky-soft); text-decoration: none; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.side-panel { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; padding: 0; }
.side-stat { padding: 10px 0 9px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.side-stat strong { display: block; font-family: Newsreader, Georgia, serif; font-size: 30px; line-height: 1; font-weight: 500; }
.side-stat span { color: var(--ink-soft); font-size: 11px; }
.side-panel.learning-panel { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.question-layout .side-panel.learning-panel { order: -1; }
.learning-hint { margin: 8px 0; color: var(--ink-soft); font-size: 12px; line-height: 1.5; }
@media (max-width: 600px) {
  .side-panel.learning-panel { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
.action-row { display: flex; justify-content: space-between; align-items: center; min-height: 48px; margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--line); gap: 15px; }
.action-row:not(.has-actions) { display: none; }
.countdown { color: var(--sky); font-size: 12px; text-align: center; }
.countdown strong { display: inline-grid; min-width: 24px; height: 24px; margin-left: 4px; place-items: center; border: 1px solid var(--sky); color: var(--sky); font-size: 13px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 10px; border: 1px solid var(--ink); background: var(--ink); color: var(--paper); padding: 14px 20px; font-size: 13px; font-weight: 700; transition: transform .2s, background .2s; }
.button:hover { transform: translateY(-2px); background: var(--sky); border-color: var(--sky); }
.button.secondary { background: transparent; border-color: var(--line); color: var(--ink); }
.button.secondary:hover { border-color: var(--sky); background: var(--sky-soft); }

.result { max-width: 700px; margin: 0 auto; text-align: center; }
.result-mark { width: 70px; height: 70px; margin: 0 auto 22px; display: grid; place-items: center; border: 1px solid var(--success); color: var(--success); border-radius: 50%; font-size: 27px; }
.result.fail .result-mark { border-color: var(--danger); color: var(--danger); }
.result h1 { margin: 0 auto 18px; font-size: clamp(54px, 8vw, 90px); }
.score { margin: 20px 0 9px; font-size: 55px; font-weight: 700; letter-spacing: -.07em; }
.score small { color: var(--ink-soft); font-size: 17px; font-weight: 400; letter-spacing: 0; }
.result-actions { display: flex; justify-content: center; gap: 10px; margin-top: 35px; flex-wrap: wrap; }

.reading-controls { position: sticky; top: 12px; z-index: 4; max-width: 940px; display: grid; grid-template-columns: minmax(240px, 1fr) auto auto; align-items: end; gap: 14px; margin: 0 auto 28px; padding: 14px; background: var(--paper); border: 1px solid var(--line); }
.reading-search span { display: block; margin-bottom: 6px; color: var(--ink-soft); font-size: 12px; font-weight: 700; }
.reading-search input { width: 100%; min-height: 46px; border: 1px solid var(--line); background: var(--white); color: var(--ink); padding: 10px 12px; font-size: 16px; }
.reading-filter { display: flex; gap: 6px; }
.filter-button { min-height: 46px; border: 1px solid var(--line); background: transparent; color: var(--ink); padding: 9px 12px; }
.filter-button.is-active { border-color: var(--sky); background: var(--sky-soft); font-weight: 700; }
.reading-range { min-height: 46px; display: flex; align-items: center; color: var(--ink-soft); font-size: 12px; white-space: nowrap; }
.reading-list { max-width: 900px; margin: 0 auto; }
.reading-item { padding: 34px 0 42px; border-top: 1px solid var(--line); scroll-margin-top: 90px; }
.reading-item:last-child { border-bottom: 1px solid var(--line); }
.reading-item-head { display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.reading-num { color: var(--sun); font-size: 11px; font-weight: 700; letter-spacing: .15em; }
.reading-question { max-width: 70ch; margin: 16px 0 24px; font-family: Newsreader, Georgia, serif; font-size: 24px; font-weight: 500; line-height: 1.48; letter-spacing: -.012em; text-wrap: pretty; }
.reading-options { display: grid; gap: 8px; margin: 0 0 22px; padding: 0; list-style: none; counter-reset: reading-option; }
.reading-option { display: grid; grid-template-columns: 26px minmax(0, 1fr) auto; gap: 10px; padding: 13px 14px; border: 1px solid var(--line); color: var(--ink); font-size: 15px; line-height: 1.55; }
.reading-option::before { counter-increment: reading-option; content: counter(reading-option, upper-alpha); color: var(--ink-soft); font-size: 11px; font-weight: 700; padding-top: 2px; }
.reading-option.is-answer { border-color: var(--sky); background: color-mix(in srgb, var(--sky) 24%, var(--white)); color: var(--ink); font-weight: 700; }
.reading-option.is-answer::before { color: var(--sky); }
.answer-badge { align-self: center; color: var(--sky); font-size: 11px; white-space: nowrap; }
.reading-image { display: block; max-width: min(100%, 760px); max-height: 420px; margin: 20px 0; object-fit: contain; }
.reading-tools { flex-shrink: 0; display: flex; gap: 10px; margin-top: 24px; }
.explanation-link { width: fit-content; min-height: 44px; margin-top: 10px; padding: 10px 0; border: 0; background: transparent; color: var(--sky); font-size: 13px; font-weight: 700; text-decoration: underline; text-underline-offset: 4px; }
.explanation-link:hover { color: var(--ink); }
.explanation-dialog { overflow: auto; overscroll-behavior: contain; width: min(680px, calc(100% - 32px)); max-height: min(760px, calc(100vh - 32px)); padding: 0; border: 1px solid var(--line); background: var(--paper); color: var(--ink); box-shadow: 0 20px 70px rgba(24, 40, 46, .22); }
.explanation-dialog::backdrop { background: rgba(24, 40, 46, .42); backdrop-filter: blur(3px); }
.explanation-dialog-head { position: sticky; top: 0; z-index: 1; background: var(--paper); display: flex; justify-content: space-between; gap: 20px; padding: 26px 30px 20px; border-bottom: 1px solid var(--line); }
.explanation-dialog h2 { margin: 10px 0 0; font-size: 38px; }
.explanation-dialog-body { padding: 26px 30px 32px; overflow: auto; }
.explanation-question { margin-bottom: 22px; color: var(--ink-soft); font-family: Newsreader, Georgia, serif; font-size: 25px; line-height: 1.12; }
.explanation-copy { font-size: 15px; line-height: 1.75; }
.explanation-formulas { display: grid; gap: 10px; margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--ink); font-size: 13px; }
.explanation-formulas > strong { color: var(--sky); font-size: 12px; letter-spacing: .12em; text-transform: uppercase; }
.explanation-formula-list { display: grid; gap: 8px; }
.explanation-formula { display: grid; gap: 7px; }
.explanation-formula h3 { margin: 0; color: var(--ink-soft); font-family: Inter, system-ui, sans-serif; font-size: 13px; font-weight: 700; letter-spacing: .01em; }
.explanation-formula-list .math-source { display: block; overflow-x: auto; padding: 12px 14px; border: 1px solid var(--line); background: color-mix(in srgb, var(--sky) 8%, var(--paper)); font-size: 1.05em; }
.explanation-formula-list .math-fallback { display: block; margin: 0; }
.math-fallback { display: inline-block; margin: 0 .12em; color: var(--ink); font-family: Georgia, serif; font-size: 1.06em; font-style: italic; white-space: nowrap; }
.math-fallback sup, .math-fallback sub { font-size: .72em; line-height: 0; font-style: normal; }
.math-vector { position: relative; display: inline-block; }
.math-vector::before { content: ""; position: absolute; top: -.1em; left: 0; right: 0; border-top: 1px solid currentColor; }
.explanation-sources { display: grid; gap: 6px; margin-top: 24px; color: var(--ink-soft); font-size: 12px; }
.explanation-sources a, .explanation-video { overflow-wrap: anywhere; color: var(--sky); }
.explanation-video { display: inline-block; margin-top: 20px; font-size: 13px; font-weight: 700; }
.explanation-empty { color: var(--ink-soft); font-size: 15px; line-height: 1.6; }
.reading-pagination { max-width: 900px; display: flex; align-items: center; justify-content: space-between; gap: 16px; margin: 28px auto 0; }
.reading-pagination span { color: var(--ink-soft); font-size: 13px; }
.reading-pagination .button:disabled { cursor: not-allowed; opacity: .45; transform: none; }
.reading-empty { padding: 56px 0; text-align: center; }
.reading-empty h2 { font-size: 36px; }
.reading-empty p, .review-summary { color: var(--ink-soft); }

.footer { display: flex; justify-content: space-between; gap: 20px; padding: 22px 0 30px; border-top: 1px solid var(--line); color: var(--ink-soft); font-size: 11px; }
.footer a { min-height: 44px; display: inline-flex; align-items: center; text-decoration: none; }
.footer a:hover { color: var(--sky); }

@media (max-width: 850px) {
  .mode-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .reading-header { flex-wrap: wrap; }
  .reading-tools { margin-top: 0; }
  .side-panel { gap: 12px; }
  .reading-controls { grid-template-columns: 1fr 1fr; }
  .reading-search { grid-column: 1 / -1; }
}
/* Phone layouts prioritize the question and give every control room to wrap. */
@media (max-width: 700px) {
  .app-shell { width: calc(100% - 32px - env(safe-area-inset-left) - env(safe-area-inset-right)); }
  .topbar, .inner-view .topbar { height: auto; min-height: 64px; padding-top: env(safe-area-inset-top); }
  .top-actions { gap: 8px; }
  .active-bank, .bank-status { display: none; }
  .main-content, .inner-view .main-content { min-height: calc(100svh - 150px); padding: 24px 0 40px; }
  .hero { padding-bottom: 24px; }
  .hero::before, .hero::after { content: none; }
  .hero .eyebrow { margin-bottom: 14px; }
  h1, .hero-copy h1 { font-size: 38px; line-height: 1.08; margin-bottom: 16px; }
  .lede { font-size: 16px; line-height: 1.55; }
  .hero .lede { margin-bottom: 0; }
  .bank-launcher { width: 100%; min-height: 112px; margin-bottom: 24px; padding: 16px; gap: 14px; }
  .bank-launcher strong { font-size: 24px; line-height: 1.12; }
  .bank-launcher small { margin-bottom: 6px; }
  .bank-launcher em { font-size: 12px; line-height: 1.5; }
  .mode-grid { grid-template-columns: minmax(0, 1fr); gap: 10px; }
  .mode-card { min-height: 0; display: grid; grid-template-columns: minmax(0, 1fr) 24px; gap: 8px 12px; padding: 18px; }
  .mode-number { grid-column: 1; font-size: 11px; letter-spacing: .08em; }
  .mode-card > span:nth-child(2) { grid-column: 1; }
  .mode-card h3 { max-width: none; margin-bottom: 6px; font-size: 25px; line-height: 1.12; }
  .mode-card p { max-width: none; font-size: 14px; line-height: 1.5; }
  .mode-card b { display: block; margin-top: 8px; color: var(--sky); font-size: 12px; }
  .mode-arrow { grid-column: 2; grid-row: 1 / 3; align-self: center; }
  .wizard-step { flex-wrap: wrap; line-height: 1.5; }
  .bank-grid { grid-template-columns: minmax(0, 1fr); gap: 10px; margin-top: 24px; }
  .bank-card { aspect-ratio: auto; min-height: 114px; display: grid; grid-template-columns: 36px minmax(0, 1fr); align-content: center; gap: 8px 12px; padding: 16px; }
  .bank-card-code { padding-top: 4px; }
  .bank-card strong { max-width: none; font-size: 24px; line-height: 1.12; }
  .bank-card span:last-child { grid-column: 2; font-size: 12px; line-height: 1.5; }
  .home-meta, .footer { align-items: flex-start; flex-direction: column; gap: 12px; }
  .home-meta { padding-top: 24px; line-height: 1.5; }
  .home-actions { align-items: flex-start; flex-direction: column; gap: 0; }
  .home-actions a { display: inline-flex; align-items: center; min-height: 44px; }
  .footer { padding-bottom: max(20px, env(safe-area-inset-bottom)); }
  .study-header, .study-header.compact { align-items: stretch; flex-direction: column; gap: 12px; margin-bottom: 20px; }
  .study-header.compact h1, .reading-header h1 { font-size: 28px; line-height: 1.15; margin-bottom: 0; }
  .study-header .lede { margin: 10px 0 0; }
  .study-actions { align-items: flex-start; gap: 8px; order: -1; }
  .study-actions .quiet-link { padding: 8px 0; }
  .context-label { margin-bottom: 6px; }
  .progress-wrap { margin-bottom: 16px; }
  .progress-label { flex-wrap: wrap; gap: 6px 12px; line-height: 1.5; }
  .question-layout { gap: 16px; }
  .question-layout .side-panel { order: 0; }
  .question-panel { min-width: 0; padding: 18px 14px; }
  .question-toolbar { align-items: stretch; flex-direction: column; gap: 12px; margin-bottom: 18px; }
  .question-preferences { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
  .auto-advance-control { padding: 8px; line-height: 1.4; }
  .auto-advance-control input { flex-shrink: 0; }
  .mark-review { padding: 8px; line-height: 1.4; }
  .question-text { max-width: none; font-size: 22px; line-height: 1.45; letter-spacing: -.006em; overflow-wrap: anywhere; }
  .question-image, .question-prompt.has-image .question-image { height: auto; max-height: 340px; }
  .response-zone { margin-top: 20px; }
  .option { grid-template-columns: 20px minmax(0, 1fr); gap: 6px 8px; padding: 13px 12px; }
  .option-text, .reading-option > span { overflow-wrap: anywhere; }
  .option-state { grid-column: 2; justify-self: start; white-space: normal; }
  .keyboard-hint { display: none; }
  .side-panel { gap: 10px; }
  .side-stat strong { font-size: 24px; }
  .action-row.has-actions { display: flex; flex-wrap: wrap; align-items: center; margin-inline: -14px; margin-bottom: -18px; padding: 10px 14px max(10px, env(safe-area-inset-bottom)); gap: 8px 12px; background: var(--white); }
  .action-row > span:empty { display: none; }
  .action-row [data-action="previous"] { width: auto; min-height: 44px; padding: 8px 0; border: 0; text-decoration: underline; text-underline-offset: 3px; }
  .action-row .countdown { flex: 1 1 120px; text-align: right; line-height: 1.5; }
  .action-row [data-action="next"] { flex-basis: 100%; }
  .button { min-height: 46px; padding: 12px 16px; }
  .result-actions { flex-direction: column; }
  .result h1 { font-size: 42px; line-height: 1.08; overflow-wrap: anywhere; }
  .result-actions .button { width: 100%; }
  .review-launcher { gap: 12px; padding: 16px; flex-wrap: wrap; line-height: 1.5; }
  .reading-tools { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 0; }
  .reading-tools .button { flex: 1 1 140px; }
  .reading-controls { position: static; grid-template-columns: minmax(0, 1fr); gap: 12px; padding: 12px; margin-bottom: 20px; }
  .reading-search { grid-column: auto; min-width: 0; }
  .reading-filter { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .filter-button { padding: 9px 8px; font-size: 14px; }
  .reading-range { min-height: 24px; white-space: normal; }
  .reading-item { padding: 24px 0 28px; }
  .reading-item-head { align-items: center; gap: 8px; flex-wrap: wrap; }
  .reading-question { font-size: 22px; line-height: 1.45; overflow-wrap: anywhere; }
  .reading-option { grid-template-columns: 20px minmax(0, 1fr); gap: 6px 8px; padding: 12px; font-size: 16px; }
  .answer-badge { grid-column: 2; justify-self: start; white-space: normal; }
  .reading-pagination { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; text-align: center; }
  .reading-pagination > span { grid-column: 1 / -1; grid-row: 1; }
  .reading-pagination .button { padding: 12px 8px; }
  .reading-empty { padding: 32px 0; }
  .reading-empty h2 { font-size: 30px; }
  .explanation-dialog { max-height: calc(100dvh - 32px - env(safe-area-inset-top) - env(safe-area-inset-bottom)); }
  .explanation-dialog-head { padding: 18px 16px; gap: 10px; }
  .explanation-dialog-body { padding: 20px 16px; }
  .explanation-dialog h2 { font-size: 28px; line-height: 1.12; }
  .explanation-dialog .eyebrow { font-size: 10px; letter-spacing: .1em; }
  .explanation-question { font-size: 22px; line-height: 1.4; }
  .explanation-copy { font-size: 16px; overflow-wrap: anywhere; }
}

@media (hover: none) {
  .mode-card:hover, .bank-card:hover, .bank-card.selected, .bank-launcher:hover,
  .option:hover:not(:disabled), .button:hover { transform: none; }
}

@media (max-height: 500px) and (orientation: landscape) {
  .home-view .topbar { position: static; }
  .action-row.has-actions { position: static; }
}

@media print {
  body { background: #fff; color: #17252a; }
  .topbar, .footer, .reading-tools, .reading-controls, .reading-pagination, .mark-review, .eyebrow, .study-header button { display: none !important; }
  .app-shell { width: 100%; }
  .main-content { padding: 0; }
  .reading-list { max-width: none; }
  .reading-item { break-inside: avoid; }
  .reading-option.is-answer { border-color: #356b78; background: #e2eeed; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
}

/* Instant answer lookup keeps the input stable while results update. */
.answer-search-controls { max-width: 900px; margin: 0 auto 24px; }
.answer-search-controls > p { margin: 8px 0; color: var(--ink-soft); font-size: 13px; line-height: 1.5; }
#answerSearchStatus { min-height: 20px; }
.answer-search-item { overflow-wrap: anywhere; }
.search-answer { padding: 16px 18px; border-left: 3px solid var(--sky); background: var(--sky-soft); color: var(--ink); }
.search-answer > strong { font-size: 12px; }
.search-answer p { margin: 8px 0 0; font-size: 17px; line-height: 1.6; }
.search-options { margin: 12px 0; }
.search-options summary { cursor: pointer; padding: 12px 0; color: var(--ink-soft); font-size: 14px; }