:root {
  --paper: #f7f4ed;
  --paper-deep: #ece7dc;
  --ink: #18312d;
  --muted: #5f706b;
  --line: #d8ddd5;
  --green: #1f6b52;
  --green-deep: #164d3c;
  --mint: #d8eee2;
  --mint-light: #eef7f1;
  --coral: #ef795f;
  --coral-soft: #fff0eb;
  --yellow: #f6d982;
  --sky: #dcecf5;
  --sky-ink: #28556a;
  --lilac: #eee8fb;
  --lilac-ink: #5a467f;
  --orange-soft: #fff0d8;
  --orange-ink: #79521f;
  --white: #fffdf8;
  --shadow: 0 16px 35px rgba(24, 49, 45, .09);
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --serif: Georgia, 'Times New Roman', serif;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; background: radial-gradient(circle at 100% 0, rgba(246, 217, 130, .18), transparent 28rem), radial-gradient(circle at 0 36%, rgba(220, 236, 245, .22), transparent 24rem), var(--paper); color: var(--ink); font-family: var(--sans); line-height: 1.6; }
button, input, select { font: inherit; }
button { cursor: pointer; }
a { color: inherit; }
:focus-visible { outline: 3px solid var(--coral); outline-offset: 3px; }

.skip-link { position: fixed; left: 1rem; top: -4rem; z-index: 20; padding: .65rem .9rem; color: var(--white); background: var(--green-deep); border-radius: var(--radius-sm); }
.skip-link:focus { top: 1rem; }
.site-header { position: sticky; top: 0; z-index: 10; border-bottom: 1px solid rgba(216, 221, 213, .9); background: rgba(247, 244, 237, .94); backdrop-filter: blur(14px); }
.header-inner { max-width: 1180px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: .85rem 1.25rem; }
.brand { display: inline-flex; align-items: center; gap: .65rem; text-decoration: none; font-size: 1.18rem; letter-spacing: -.03em; }
.brand strong { font-weight: 800; }
.brand em { font-style: normal; color: var(--green); font-weight: 500; }
.brand-mark { display: grid; width: 2.25rem; height: 2.25rem; place-items: center; border-radius: 11px; background: var(--mint); }
.brand-mark svg { width: 1.65rem; height: 1.65rem; fill: none; stroke: var(--green); stroke-linecap: round; stroke-linejoin: round; stroke-width: 2.3; }
.header-actions { display: flex; align-items: center; gap: .8rem; }
.offline-pill { display: inline-flex; align-items: center; gap: .45rem; padding: .3rem .65rem; border: 1px solid #c7dfd1; border-radius: 999px; color: var(--green-deep); background: var(--mint-light); font-size: .77rem; font-weight: 700; }
.status-dot { width: .45rem; height: .45rem; border-radius: 50%; background: var(--green); }
.icon-button { width: 2.2rem; height: 2.2rem; border: 1px solid var(--line); border-radius: 50%; color: var(--green-deep); background: var(--white); font-size: 1.25rem; line-height: 1; }

main { max-width: 1180px; min-height: calc(100vh - 150px); margin: 0 auto; padding: 2.3rem 1.25rem 4rem; }
.view { animation: rise .28s ease both; }
@keyframes rise { from { opacity: .2; transform: translateY(5px); } to { opacity: 1; transform: translateY(0); } }
.hero { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(300px, .92fr); gap: 1.2rem; align-items: stretch; margin-bottom: 1.25rem; }
.hero-copy { padding: clamp(1.4rem, 5vw, 3.6rem) clamp(1rem, 4vw, 3rem); border-radius: var(--radius-lg); color: var(--white); background: var(--green-deep); position: relative; overflow: hidden; }
.hero-copy::after { content: ''; position: absolute; width: 260px; height: 260px; right: -100px; bottom: -130px; border: 1px solid rgba(255,255,255,.18); border-radius: 50%; box-shadow: 0 0 0 25px rgba(255,255,255,.04), 0 0 0 50px rgba(255,255,255,.03); }
.hero h1 { max-width: 650px; margin: .35rem 0 1rem; font-family: var(--serif); font-size: clamp(2.6rem, 6vw, 5rem); line-height: .98; letter-spacing: -.06em; }
.hero p { max-width: 600px; margin: 0; color: #d7e7df; font-size: 1.08rem; }
.hero-note { display: flex; gap: .65rem; align-items: flex-start; margin-top: 1.5rem; max-width: 500px; padding: .75rem .9rem; border: 1px solid rgba(255,255,255,.2); border-radius: var(--radius-sm); background: rgba(255,255,255,.08); font-size: .85rem; }
.hero-note strong { color: var(--yellow); }
.hero-visual { display: flex; flex-direction: column; justify-content: space-between; min-height: 350px; padding: 1.5rem; border: 1px solid #c7dfd1; border-radius: var(--radius-lg); background: var(--mint); }
.visual-top { display: flex; justify-content: space-between; align-items: start; gap: 1rem; }
.eyebrow { margin: 0; color: var(--coral); font-size: .72rem; font-weight: 800; letter-spacing: .13em; text-transform: uppercase; }
.hero-visual .eyebrow { color: var(--green); }
.seed-illustration { align-self: center; width: min(100%, 230px); margin: 1rem 0; }
.seed-illustration svg { display: block; width: 100%; height: auto; }
.seed-illustration .ground { stroke: var(--green-deep); stroke-width: 6; stroke-linecap: round; }
.seed-illustration .stem { fill: none; stroke: var(--green); stroke-width: 5; stroke-linecap: round; }
.seed-illustration .leaf { fill: var(--green); }
.seed-illustration .coin { fill: var(--yellow); stroke: var(--green-deep); stroke-width: 3; }
.visual-caption { max-width: 250px; margin: 0; color: var(--green-deep); font-family: var(--serif); font-size: 1.35rem; line-height: 1.15; }
.hero-image { display: block; width: 100%; max-width: 430px; margin: 1rem auto; border-radius: var(--radius-md); mix-blend-mode: multiply; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: .45rem; min-height: 2.7rem; padding: .65rem 1rem; border: 1px solid transparent; border-radius: 999px; color: var(--white); background: var(--green); font-weight: 800; text-decoration: none; transition: transform .18s ease, background .18s ease; }
.btn:hover { transform: translateY(-1px); background: var(--green-deep); }
.btn.secondary { color: var(--green-deep); border-color: #c7dfd1; background: var(--mint-light); }
.btn.ghost { color: var(--green-deep); border-color: var(--line); background: var(--white); }
.btn.coral { color: #53271f; background: var(--yellow); }
.btn.small { min-height: 2.2rem; padding: .45rem .8rem; font-size: .86rem; }
.button-row { display: flex; flex-wrap: wrap; align-items: center; gap: .7rem; margin-top: 1.35rem; }

.section-heading { display: flex; justify-content: space-between; align-items: end; gap: 1rem; margin: 2.5rem 0 1rem; }
.section-heading h2, .page-heading h1 { margin: .15rem 0 0; font-family: var(--serif); letter-spacing: -.04em; line-height: 1.05; }
.section-heading h2 { font-size: clamp(1.8rem, 4vw, 2.5rem); }
.page-heading { max-width: 750px; margin-bottom: 1.5rem; }
.page-heading h1 { font-size: clamp(2.4rem, 5vw, 4.25rem); }
.page-heading p { margin: .9rem 0 0; color: var(--muted); font-size: 1.07rem; }

.progress-card, .callout, .card, .lesson-rail, .reading-pane, .tool-card, .quiz-card, .safety-card, .checklist { border: 1px solid var(--line); background: var(--white); box-shadow: var(--shadow); }
.progress-card { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 1rem; align-items: center; padding: 1rem 1.2rem; border-radius: var(--radius-md); }
.progress-card h3 { margin: 0; font-size: 1rem; }
.progress-card p { margin: .1rem 0 0; color: var(--muted); font-size: .86rem; }
.progress-track { width: min(340px, 34vw); height: .55rem; overflow: hidden; border-radius: 999px; background: var(--paper-deep); }
.progress-fill { height: 100%; border-radius: inherit; background: var(--green); transition: width .25s ease; }
.progress-meta { display: flex; gap: .55rem; align-items: center; color: var(--green-deep); font-size: .82rem; font-weight: 800; }

.home-grid, .two-col, .tool-grid, .safety-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.essentials-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .7rem; }
.card, .callout, .tool-card, .quiz-card, .safety-card, .checklist { padding: 1.25rem; border-radius: var(--radius-md); }
.mini-card { display: flex; gap: .65rem; min-height: 100%; padding: .85rem; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--white); }
.mini-card:nth-child(2n) { background: #f7fbff; }
.mini-card:nth-child(3n) { background: #fcfaff; }
.mini-card h3 { margin: .05rem 0 .2rem; font-size: .95rem; }
.mini-card p { margin: 0; color: var(--muted); font-size: .82rem; line-height: 1.4; }
.card h3, .tool-card h3, .quiz-card h3, .safety-card h3 { margin: .35rem 0 .35rem; font-size: 1.17rem; }
.card p, .tool-card p, .safety-card p { margin: 0; color: var(--muted); }
.card-accent { position: relative; overflow: hidden; }
.card-accent::before { content: ''; position: absolute; inset: 0 auto 0 0; width: 5px; background: var(--coral); }
.home-grid .card:nth-child(2) { border-color: #cbd9ee; background: #f7fbff; }
.home-grid .card:nth-child(3) { border-color: #ddd1f1; background: #fcfaff; }
.home-grid .card:nth-child(4) { border-color: #f1d9ae; background: #fffaf1; }
.card-number { display: inline-grid; width: 2rem; height: 2rem; place-items: center; border-radius: 9px; color: var(--green-deep); background: var(--mint); font-weight: 900; }
.callout { position: relative; padding-left: 1.45rem; border-left: 5px solid var(--coral); background: var(--coral-soft); box-shadow: none; }
.callout h3 { margin: 0 0 .25rem; font-size: 1rem; }
.callout p { margin: 0; color: #68453d; }

.path-list { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .7rem; margin: 0; padding: 0; list-style: none; }
.path-item { min-height: 125px; padding: .9rem; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--white); }
.path-item button { width: 100%; padding: 0; border: 0; color: inherit; background: transparent; text-align: left; }
.path-item.is-done { border-color: #add5be; background: var(--mint-light); }
.path-kicker { display: flex; justify-content: space-between; color: var(--muted); font-size: .74rem; font-weight: 800; }
.path-item h3 { margin: .6rem 0 .25rem; font-size: .98rem; line-height: 1.25; }
.path-item p { margin: 0; color: var(--muted); font-size: .8rem; line-height: 1.35; }
.check { color: var(--green); font-size: 1.1rem; }

.app-nav { display: flex; gap: .35rem; margin-bottom: 1.8rem; padding: .35rem; overflow-x: auto; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,253,248,.75); }
.app-nav button { flex: 1 0 auto; min-height: 2.3rem; padding: .45rem .85rem; border: 0; border-radius: 999px; color: var(--muted); background: transparent; font-size: .87rem; font-weight: 800; white-space: nowrap; }
.app-nav button:hover, .app-nav button[aria-current='page'] { color: var(--white); background: var(--green); }
.disclaimer-strip { margin: -.95rem 0 1.4rem; padding: .62rem .9rem; border: 1px solid #e9c7bd; border-radius: var(--radius-sm); color: #70483e; background: var(--coral-soft); font-size: .78rem; line-height: 1.45; }
.disclaimer-strip strong { color: #5d3028; }

.learn-layout { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 1rem; align-items: start; }
.lesson-rail { position: sticky; top: 5.4rem; padding: .65rem; border-radius: var(--radius-md); }
.lesson-rail button { display: flex; width: 100%; gap: .65rem; align-items: flex-start; padding: .72rem; border: 0; border-radius: 10px; color: var(--muted); background: transparent; text-align: left; }
.lesson-rail button:hover, .lesson-rail button[aria-current='true'] { color: var(--green-deep); background: var(--mint-light); }
.rail-index { flex: 0 0 auto; display: grid; width: 1.55rem; height: 1.55rem; place-items: center; border-radius: 50%; color: var(--green-deep); background: var(--paper-deep); font-size: .72rem; font-weight: 900; }
.lesson-rail button[aria-current='true'] .rail-index { color: var(--white); background: var(--green); }
.rail-title { font-size: .82rem; font-weight: 800; line-height: 1.25; }
.reading-pane { min-width: 0; padding: clamp(1.25rem, 4vw, 2.5rem); border-radius: var(--radius-lg); }
.lesson-top { display: flex; justify-content: space-between; gap: 1rem; align-items: flex-start; }
.lesson-top h2 { max-width: 680px; margin: .3rem 0 1rem; font-family: var(--serif); font-size: clamp(2rem, 5vw, 3.4rem); letter-spacing: -.05em; line-height: 1.05; }
.lesson-intro { max-width: 720px; margin: 0 0 1.4rem; color: var(--muted); font-size: 1.09rem; }
.lesson-body { max-width: 720px; }
.lesson-body h3 { margin: 1.8rem 0 .45rem; font-size: 1.1rem; }
.lesson-body p { margin: .7rem 0; }
.lesson-body ul { padding-left: 1.2rem; }
.lesson-body li { margin: .45rem 0; }
.lesson-body strong { color: var(--green-deep); }
.lesson-image { display: block; width: min(100%, 620px); height: auto; margin: .3rem 0 1rem; border-radius: var(--radius-md); mix-blend-mode: multiply; }
.lesson-tools { display: flex; justify-content: space-between; gap: .7rem; align-items: center; margin-top: 2rem; padding-top: 1.1rem; border-top: 1px solid var(--line); }
.lesson-tools .muted { color: var(--muted); font-size: .85rem; }
.term-link { padding: .05rem .3rem; border: 0; border-bottom: 2px solid var(--yellow); color: var(--green-deep); background: transparent; font-weight: 800; }

.quiz-list { display: grid; gap: 1rem; }
.quiz-card { box-shadow: none; }
.quiz-card legend { width: 100%; margin-bottom: .85rem; font-weight: 850; }
.option-list { display: grid; gap: .5rem; margin: 0; padding: 0; border: 0; }
.option { display: flex; gap: .65rem; align-items: flex-start; padding: .65rem .75rem; border: 1px solid var(--line); border-radius: var(--radius-sm); color: var(--muted); background: var(--paper); cursor: pointer; }
.option:hover, .option:has(input:focus-visible) { border-color: var(--green); background: var(--mint-light); }
.option input { margin-top: .35rem; accent-color: var(--green); }
.option.is-correct { border-color: #9bcdb1; background: var(--mint-light); }
.option.is-wrong { border-color: #e4aa9b; background: var(--coral-soft); }
.answer-note { margin: .85rem 0 0; padding: .75rem; border-radius: var(--radius-sm); color: var(--green-deep); background: var(--mint-light); font-size: .9rem; }
.answer-note.wrong { color: #71382d; background: var(--coral-soft); }
.scenario { margin-top: 1.2rem; padding: 1.3rem; border-radius: var(--radius-md); color: var(--white); background: var(--green-deep); }
.scenario h3 { margin-top: 0; color: var(--white); }
.scenario p { color: #d7e7df; }
.scenario button { display: block; width: 100%; margin: .55rem 0; padding: .7rem .85rem; border: 1px solid rgba(255,255,255,.24); border-radius: var(--radius-sm); color: var(--white); background: rgba(255,255,255,.08); text-align: left; }
.scenario button:hover, .scenario button.is-selected { border-color: var(--yellow); background: rgba(246,217,130,.16); }

.search-row { display: flex; gap: .65rem; align-items: center; margin-bottom: 1rem; }
.search-row input { flex: 1; min-width: 0; padding: .85rem 1rem; border: 1px solid var(--line); border-radius: 999px; color: var(--ink); background: var(--white); }
.filter-row { display: flex; gap: .45rem; flex-wrap: wrap; margin-bottom: 1.2rem; }
.filter-row button { padding: .35rem .7rem; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); background: var(--white); font-size: .8rem; font-weight: 800; }
.filter-row button[aria-pressed='true'] { color: var(--white); border-color: var(--green); background: var(--green); }
.glossary-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .7rem; }
.term-card { padding: 1rem; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--white); }
.term-card:nth-child(3n + 1) { border-top: 4px solid var(--green); }
.term-card:nth-child(3n + 2) { border-top: 4px solid #8bb7cd; }
.term-card:nth-child(3n) { border-top: 4px solid #b69ad9; }
.term-card dt { display: flex; justify-content: space-between; gap: .5rem; color: var(--green-deep); font-weight: 900; }
.term-card dd { margin: .45rem 0 0; color: var(--muted); font-size: .9rem; line-height: 1.45; }
.term-tag { color: var(--coral); font-size: .68rem; letter-spacing: .08em; text-transform: uppercase; }
.empty-state { grid-column: 1 / -1; padding: 2rem; border: 1px dashed var(--line); border-radius: var(--radius-md); color: var(--muted); text-align: center; }

.tool-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); align-items: start; }
.tool-card { box-shadow: none; }
.tool-card h3 { font-family: var(--serif); font-size: 1.55rem; }
.field { display: grid; gap: .32rem; margin: .85rem 0; }
.field label { color: var(--muted); font-size: .8rem; font-weight: 800; }
.field input, .field select { width: 100%; padding: .62rem .7rem; border: 1px solid var(--line); border-radius: var(--radius-sm); color: var(--ink); background: var(--paper); }
.input-with-unit { display: flex; }
.input-with-unit input { border-radius: var(--radius-sm) 0 0 var(--radius-sm); }
.input-unit { display: grid; min-width: 3rem; place-items: center; border: 1px solid var(--line); border-left: 0; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--muted); background: var(--paper-deep); font-size: .8rem; }
.result { margin-top: 1rem; padding: .9rem; border-radius: var(--radius-sm); color: var(--green-deep); background: var(--mint-light); }
.result-label { display: block; color: var(--muted); font-size: .75rem; font-weight: 800; }
.result-value { display: block; margin-top: .12rem; font-size: 1.55rem; font-weight: 900; letter-spacing: -.04em; }
.assumption { margin: .8rem 0 0; color: var(--muted); font-size: .76rem; line-height: 1.4; }

.safety-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.safety-card { box-shadow: none; }
.safety-card.alert { background: var(--coral-soft); border-color: #f0c1b6; }
.safety-card.safe { background: var(--mint-light); border-color: #c7dfd1; }
.safety-card ul { padding-left: 1.1rem; color: var(--muted); }
.safety-card li { margin: .4rem 0; }
.checklist { box-shadow: none; }
.checklist h3 { margin-top: 0; font-family: var(--serif); font-size: 1.7rem; }
.checklist label { display: flex; gap: .65rem; align-items: flex-start; padding: .62rem 0; border-bottom: 1px solid var(--line); color: var(--muted); }
.checklist label:last-child { border-bottom: 0; }
.checklist input { margin-top: .35rem; accent-color: var(--green); }
.myth-grid, .review-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .8rem; }
.myth-card, .review-card { padding: 1rem 1.1rem; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--white); }
.myth-card { border-top: 4px solid var(--yellow); }
.myth-card h3, .review-card h3 { margin: 0 0 .35rem; font-size: 1rem; }
.myth-card p, .review-card p { margin: 0; color: var(--muted); font-size: .9rem; line-height: 1.5; }
.review-card { position: relative; padding-left: 4rem; box-shadow: none; }
.review-card .card-number { position: absolute; left: 1rem; top: 1rem; }
.source-panel { padding: 1.2rem; border: 1px solid #c7dfd1; border-radius: var(--radius-md); background: var(--mint-light); }
.source-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .45rem .9rem; }
.source-list a { display: flex; justify-content: space-between; gap: .5rem; padding: .5rem .6rem; border-bottom: 1px solid #c7dfd1; color: var(--green-deep); font-size: .86rem; font-weight: 800; text-decoration: none; }
.source-list a:hover { color: var(--coral); }
.source-panel .small-note { margin-bottom: 0; }

.home-grid .card:hover, .path-item:hover, .term-card:hover, .myth-card:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(24, 49, 45, .08); }
.home-grid .card, .path-item, .term-card, .myth-card { transition: transform .18s ease, box-shadow .18s ease; }

.muted { color: var(--muted); }
.small-note { color: var(--muted); font-size: .82rem; }
.footer-rule { height: 1px; margin: 2rem 0; background: var(--line); }
.site-footer { display: flex; max-width: 1180px; justify-content: space-between; gap: 1rem; margin: 0 auto; padding: 1.5rem 1.25rem 2.2rem; border-top: 1px solid var(--line); color: var(--muted); font-size: .8rem; }
.site-footer div { display: flex; gap: .8rem; }
.site-footer strong { color: var(--green-deep); }
.creator-credit { color: var(--green-deep); font-weight: 800; }
.noscript-card { max-width: 680px; margin: 4rem auto; padding: 2rem; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--white); }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; }
  .hero-visual { min-height: auto; }
  .path-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .essentials-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .learn-layout { grid-template-columns: 1fr; }
  .lesson-rail { position: static; display: flex; overflow-x: auto; gap: .25rem; padding: .45rem; }
  .lesson-rail button { min-width: 165px; }
  .tool-grid, .safety-grid { grid-template-columns: 1fr; }
  .glossary-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .source-list { grid-template-columns: 1fr; }
}

/* Portrait-first tuning for common 9:16 phone previews. */
@media (max-width: 760px) {
  .header-inner { gap: .45rem; }
  .brand { font-size: 1.02rem; }
  .brand-mark { width: 2rem; height: 2rem; }
  .brand-mark svg { width: 1.45rem; height: 1.45rem; }
  .header-actions { gap: .45rem; }
  .offline-pill { max-width: 6.8rem; overflow: hidden; padding: .27rem .5rem; font-size: .68rem; white-space: nowrap; }
  .app-nav { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .25rem; border-radius: var(--radius-md); }
  .app-nav button { min-height: 2.55rem; padding: .38rem .2rem; font-size: .76rem; }
  .disclaimer-strip { margin-top: -.5rem; padding: .55rem .7rem; font-size: .72rem; }
  .hero-copy { padding: 1.3rem 1rem 1.45rem; }
  .hero h1 { font-size: clamp(2.4rem, 12.5vw, 3.5rem); }
  .hero-visual { min-height: 245px; padding: 1.05rem; }
  .seed-illustration { max-width: 175px; margin: .35rem auto; }
  .visual-caption { font-size: 1.15rem; }
  .page-heading h1 { font-size: clamp(2.25rem, 11vw, 3.2rem); }
  .reading-pane { padding: 1.05rem .9rem; }
  .lesson-rail { scroll-snap-type: x mandatory; }
  .lesson-rail button { min-width: 145px; scroll-snap-align: start; padding: .6rem; }
  .lesson-top h2 { font-size: clamp(1.9rem, 9.2vw, 2.7rem); }
  .lesson-tools .button-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lesson-tools .button-row .btn { width: 100%; }
  .source-panel { padding: .9rem; }
  .tool-card h3 { font-size: 1.4rem; }
}

@media (max-width: 620px) {
  main { padding: 1.2rem .8rem 3rem; }
  .header-inner { padding: .7rem .8rem; }
  .offline-pill { display: inline-flex; }
  .hero-copy { padding: 1.45rem 1.1rem 1.7rem; }
  .hero h1 { font-size: clamp(2.5rem, 14vw, 4rem); }
  .hero p { font-size: 1rem; }
  .home-grid, .two-col { grid-template-columns: 1fr; }
  .essentials-grid { grid-template-columns: 1fr; }
  .section-heading { display: block; }
  .section-heading .btn { margin-top: .7rem; }
  .progress-card { grid-template-columns: 1fr; }
  .progress-track { width: 100%; }
  .path-list { grid-template-columns: 1fr 1fr; gap: .5rem; }
  .path-item { min-height: 115px; padding: .7rem; }
  .app-nav { border-radius: var(--radius-md); }
  .app-nav button { flex: 0 0 auto; }
  .lesson-top { display: block; }
  .lesson-top .btn { margin-top: .4rem; }
  .lesson-tools { align-items: stretch; flex-direction: column; }
  .lesson-tools .button-row { margin-top: 0; }
  .glossary-list { grid-template-columns: 1fr; }
  .myth-grid, .review-grid { grid-template-columns: 1fr; }
  .search-row { align-items: stretch; flex-direction: column; }
  .search-row .btn { width: 100%; }
  .site-footer { display: block; padding-left: .8rem; padding-right: .8rem; }
  .site-footer div { display: block; }
  .site-footer span { display: block; margin-top: .45rem; }
}

@media print {
  .site-header, .app-nav, .button-row, .site-footer, .lesson-rail, .search-row, .filter-row { display: none !important; }
  body, main { background: white; }
  main { max-width: none; padding: 0; }
  .checklist { border: 0; box-shadow: none; }
}