:root {
  color-scheme: light;
  --bg: #f8f5ef;
  --paper: #fffdf9;
  --section: #f1ede5;
  --ink: #251e38;
  --muted: #61576e;
  --line: #ded6e5;
  --accent: #5534a8;
  --accent-hover: #412684;
  --on-accent: #fff;
  --accent-soft: #eae1fa;
  --hero-accent: #5c39b1;
  --focus: #6945c0;
  --shadow: 0 5px 16px #3522480b;
  --nav-height: 106px;
  --glide: cubic-bezier(.2,.72,.24,1);
  --glass-rim: #ffffffc9;
  --glass-surface: linear-gradient(155deg,#ffffffbb,#ffffff28 67%),color-mix(in srgb,var(--paper) 91%,var(--accent-soft));
  --glass-depth: 0 12px 30px #3d256710, inset 0 1px 0 var(--glass-rim);
  --ambient: radial-gradient(ellipse at 3% 1%,#e9dafa90,transparent 49%),radial-gradient(ellipse at 92% 4%,#ccece17d,transparent 47%);
  font-family: "Instrument Sans", "Noto Sans Tamil", "Nirmala UI", "Segoe UI", system-ui, sans-serif;
  font-synthesis: none;
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #181528;
  --paper: #241e35;
  --section: #201a30;
  --ink: #f7efff;
  --muted: #c9bdd7;
  --line: #463b56;
  --accent: #cdb8ff;
  --accent-hover: #e3d4ff;
  --on-accent: #231442;
  --accent-soft: #3e315b;
  --hero-accent: #d5bfff;
  --focus: #deccff;
  --shadow: 0 5px 16px #08030e38;
  --glass-rim: #f0e3ff26;
  --glass-surface: linear-gradient(155deg,#e3cfff16,#bda6ef03 67%),color-mix(in srgb,var(--paper) 90%,var(--accent-soft));
  --glass-depth: 0 13px 30px #09041342, inset 0 1px 0 var(--glass-rim);
  --ambient: radial-gradient(ellipse at 4% 2%,#49316869,transparent 49%),radial-gradient(ellipse at 92% 2%,#244d565e,transparent 48%);
}
* { box-sizing: border-box; }
html { scroll-padding-top: calc(var(--nav-height) + 14px); }
body { margin: 0; background: var(--ambient) top / 100% 760px no-repeat,var(--bg); color: var(--ink); font-size: 1rem; line-height: 1.6; min-height: 100vh; display: flex; flex-direction: column; }
body > main { flex: 1; }
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 4px; }
h1[tabindex="-1"]:focus, h2[tabindex="-1"]:focus, #main:focus, #feedback:focus { outline: none; }
img { display: block; max-width: 100%; }
p, h1, h2, h3, figure, dl, dd { margin: 0; }
h1, h2, h3 { font-weight: 750; line-height: 1.22; overflow-wrap: anywhere; }
p { color: var(--muted); }
[hidden] { display: none !important; }
.sr-only, .skip-link:not(:focus) {
  position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap;
}
.skip-link:focus { position: fixed; top: 8px; left: 8px; z-index: 20; border-radius: 12px; background: var(--paper); padding: 12px 16px; }
.wrap { width: min(100% - 34px, 1160px); margin-inline: auto; }
.site-header { position: sticky; top: 0; z-index: 10; background: var(--bg); border-bottom: 1px solid var(--line); }
@supports (backdrop-filter: blur(1px)) {
  .site-header { background:color-mix(in srgb,var(--bg) 86%,transparent); backdrop-filter:blur(12px); }
}
.header-inner { min-height: 102px; display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 0 12px; padding-block: 8px 4px; }
.brand { display: inline-flex; align-items: center; gap: 9px; width: max-content; color: var(--ink); font-size: 1.8rem; font-weight: 800; line-height: 1; letter-spacing: -.065em; }
.brand-mark { display: grid; place-items: center; width: 37px; height: 37px; border-radius: 11px; background: var(--accent); color: var(--on-accent); font-size: 1.24rem; font-weight: 800; letter-spacing: 0; }
.brand-dot { color: var(--hero-accent); }
.site-header nav { display: flex; grid-row: 2; grid-column: 1/-1; justify-content: space-between; gap: 3px; }
.site-header nav a { padding: 9px 7px; min-height: 42px; font-size: .9rem; font-weight: 700; color: var(--muted); border-radius: 8px; }
.site-header nav a:hover, .site-header nav a[aria-current] { color: var(--accent); }
.header-actions { display: flex; align-items: center; gap: 7px; justify-content: end; }
.language { display: flex; align-items: center; padding: 2px; border: 1px solid var(--line); background: var(--paper); border-radius: 999px; }
.language button, .theme { background: transparent; border: 0; }
.language button { border-radius: 99px; padding: 4px 8px; font-size: .76rem; font-weight: 700; min-height: 35px; }
.language [aria-pressed="true"] { color: var(--accent); background: var(--accent-soft); }
.theme { display: grid; place-items: center; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 50%; background: var(--paper); font-size: 1.45rem; line-height: 1; }
.theme:hover { color: var(--accent); }
.offline { background: var(--accent-soft); padding: 9px 17px; text-align: center; font-size: .9rem; }
.button { display: inline-flex; min-height: 47px; align-items: center; justify-content: center; gap: 10px; padding: 10px 18px; border-radius: 12px; border: 1px solid transparent; font-weight: 740; line-height: 1.35; text-align: center; transition:transform .24s var(--glide),background-color .24s ease,color .24s ease; }
.button:active { transform:translateY(1px); }
.button.primary { background: var(--accent); color: var(--on-accent); box-shadow: 0 3px 0 color-mix(in srgb, var(--accent) 76%, #302041); }
.button.primary:hover { background: var(--accent-hover); }
.button.secondary { background: var(--paper); border-color: var(--line); color: var(--ink); }
.button.secondary:hover { background: var(--accent-soft); color: var(--accent); }
.button.compact { min-height: 44px; padding: 7px 12px; font-size: .92rem; }
.button.danger { background: var(--paper); color: #a22b43; border-color: #d8a1ac; }
[data-theme="dark"] .button.danger { color: #ffbbc6; border-color: #935768; }
.button[aria-disabled="true"] { cursor: default; color: var(--muted); }
.text-button { border: 0; background: none; padding: 8px 2px; min-height: 44px; }
.text-link, .text-button { color: var(--accent); font-weight: 700; text-decoration: underline; text-underline-offset: 4px; }
.hero { display: grid; gap: 30px; align-items: center; padding-block: 34px 34px; }
.hero-copy { display: grid; justify-items: start; align-content: center; gap: 19px; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; font-weight: 800; font-size: .78rem; letter-spacing: .065em; color: var(--accent); }
.eyebrow-dot { width: 9px; height: 9px; border-radius: 50%; background: #de8d47; flex: 0 0 auto; }
.hero h1 { font-size: clamp(2.58rem, 7vw, 5.15rem); line-height: 1.025; letter-spacing: -.063em; max-width: 11.7ch; }
.hero h1 em { font-style: normal; color: var(--hero-accent); }
.hero-description { font-size: clamp(1rem, 1.8vw, 1.19rem); max-width: 40ch; }
.hero-button { min-height: 51px; padding-inline: 21px; }
.hero-figure { border: 1px solid #bc8e423e; border-radius: 22px; background: #f1d88d; overflow: hidden; box-shadow: 0 7px 0 #a46e231c; }
.hero-figure img { width: 100%; height: auto; aspect-ratio: 1.34; object-fit: cover; }
.class-library { background: var(--section); border-block: 1px solid var(--line); padding-block: 32px 40px; }
.library-heading { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 6px 16px; }
.library-heading h2, .how h2 { font-size: clamp(1.85rem, 3.5vw, 2.7rem); letter-spacing: -.042em; }
.class-group { margin-top: 23px; }
.subject-group + .subject-group { margin-top: 27px; }
.subject-group > h2 { font-size: 1.24rem; margin-bottom: 12px; }
.group-heading { display: flex; align-items: baseline; gap: 5px 11px; flex-wrap: wrap; margin-bottom: 11px; }
.group-heading h3 { font-size: 1.13rem; }
.group-heading > span { color: var(--muted); font-size: .86rem; }
.folder-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 13px; }
.tone-mint { --tint: #d5efe0; --tab: #abdbc0; --tint-ink: #215b47; }
.tone-violet { --tint: #e5dafa; --tab: #cdb7ed; --tint-ink: #52348a; }
.tone-peach { --tint: #f6dfca; --tab: #ebbd98; --tint-ink: #784124; }
.tone-sky { --tint: #d7e8f8; --tab: #add0ea; --tint-ink: #255476; }
.tone-rose { --tint: #f5dce7; --tab: #eab5cf; --tint-ink: #863a62; }
.folder { padding: 13px 11px 11px; display: block; min-width: 0; background: var(--glass-surface); border: 1px solid var(--line); border-radius: 19px; box-shadow: var(--glass-depth); transition:transform .45s var(--glide),border-color .32s ease; }
.folder-art { display: block; position: relative; isolation: isolate; height: 71px; margin-block: 2px 8px; perspective: 240px; }
.folder-back, .folder-paper, .folder-front { display: block; position: absolute; transition: transform .56s var(--glide); }
.folder-back { inset: 9px 0 0; border-radius: 0 12px 10px 10px; background: var(--tab); }
.folder-back::before { content: ""; position: absolute; height: 13px; width: 49%; left: 0; top: -8px; background: var(--tab); border-radius: 10px 11px 0 0; }
.folder-paper { inset: 11px 12% 9px; border-radius: 7px; background: #fffdf7; border: 1px solid color-mix(in srgb,var(--tab) 68%,#fff); transform: rotate(-4deg); }
.folder-paper::before { content: ""; position: absolute; height: 12px; left: 12%; right: 28%; top: 9px; border-block: 1px solid var(--tab); opacity: .7; }
.folder-front { inset: 21px 0 0; display: flex; justify-content: space-between; align-items: center; padding: 0 10px; background:linear-gradient(145deg,#ffffff78,transparent 66%),var(--tint); color: var(--tint-ink); border-radius: 9px 12px 10px 10px; border: 1px solid color-mix(in srgb, var(--tab) 72%, var(--tint)); transform-origin: bottom; box-shadow:inset 0 1px 0 #ffffffba,0 4px 7px #2d1d3612; }
.folder-symbol { font-size: 1.68rem; line-height: 1; font-weight: 760; }
.folder-arrow { font-size: 1.15rem; font-weight: 750; }
.folder:focus-visible .folder-paper { transform: translateY(-12px) rotate(-8deg); }
.folder:focus-visible .folder-front { transform: rotateX(-16deg); }
@media (hover:hover) and (pointer:fine) {
  .folder:hover { transform:translateY(-4px); border-color:color-mix(in srgb,var(--line) 60%,var(--accent)); }
  .folder:hover .folder-paper { transform:translateY(-12px) rotate(-8deg); }
  .folder:hover .folder-front { transform:rotateX(-16deg); }
}
.folder:active .folder-paper { transform: translateY(-7px) rotate(-6deg); }
.folder-caption { display: grid; gap: 1px; line-height: 1.35; overflow-wrap: anywhere; }
.folder-caption strong { font-size: 1rem; }
.folder-caption > span { font-size: .83rem; color: var(--muted); }
.how { padding-block: 37px 45px; }
.steps { list-style: none; display: grid; grid-template-columns: 1fr; gap: 12px; padding: 0; margin: 18px 0 0; }
.steps li { display: flex; align-items: flex-start; gap: 13px; background: var(--paper); padding: 14px; border: 1px solid var(--line); border-radius: 14px; }
.steps li h3 { font-size: 1rem; margin-block: 3px; }
.steps li p { font-size: .88rem; }
.step-icon, .chapter-icon { display: grid; place-items: center; flex: 0 0 auto; width: 40px; height: 40px; border-radius: 10px; background: var(--tint); color: var(--tint-ink); font-size: 1.24rem; font-weight: 800; }
.site-footer { border-top: 1px solid var(--line); background: var(--section); }
.footer-inner { padding-block: 24px; display: flex; gap: 13px 34px; flex-wrap: wrap; justify-content: space-between; align-items: center; }
.footer-inner p { margin-top: 10px; font-size: .89rem; }
.footer-inner nav { display: flex; align-items: center; gap: 19px; flex-wrap: wrap; font-size: .88rem; font-weight: 650; }
.footer-inner nav a:hover { text-decoration: underline; }
.inner-page { padding-block: 26px 48px; }
.crumbs { margin-bottom: 22px; }
.crumbs ol { display: flex; gap: 4px 8px; flex-wrap: wrap; list-style: none; padding: 0; margin: 0; color: var(--muted); font-size: .87rem; }
.crumbs li { display: inline-flex; align-items: baseline; gap: 8px; }
.crumbs li + li::before { content: "›" / ""; }
.crumbs a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.page-heading { margin-bottom: 25px; }
.page-heading h1 { font-size: clamp(2.05rem,5vw,3.75rem); letter-spacing: -.053em; }
.page-heading p { margin-top: 9px; }
.term-nav { display: flex; flex-wrap: wrap; gap: 7px; margin-block: 0 22px; }
.term-nav a { display: inline-flex; align-items: center; min-height: 44px; padding: 6px 14px; border: 1px solid var(--line); border-radius: 999px; background: var(--paper); font-weight: 680; font-size: .9rem; }
.term-nav a[aria-current], .term-nav a:hover { background: var(--accent-soft); color: var(--accent); border-color: var(--accent); }
.page-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; margin-top: 23px; }
.surface { background: var(--paper); border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); }
.chapter-grid, .book-grid, .report-grid { display: grid; gap: 14px; }
.chapter-card { display: flex; gap: 12px; align-items: center; padding: 14px; border-radius: 19px; border: 1px solid var(--line); background: var(--glass-surface); box-shadow: var(--glass-depth); transition:border-color .28s ease,transform .4s var(--glide); }
@media (hover:hover) and (pointer:fine) {
  .chapter-card:hover { transform:translateY(-2px); }
}
.chapter-card:hover { border-color: var(--accent); }
.chapter-card-copy { min-width: 0; display: grid; flex: 1; gap: 3px; overflow-wrap: anywhere; line-height: 1.34; }
.chapter-card-copy strong { font-size: 1.11rem; }
.chapter-card-copy span { font-size: .85rem; color: var(--muted); }
.overline { font-weight: 700; color: var(--accent); font-size: .86rem; }
.ring { flex: 0 0 auto; display: grid; place-items: center; width: 49px; aspect-ratio: 1; border-radius: 50%; background: conic-gradient(var(--accent) var(--score),var(--line) 0); color: var(--ink); font-weight: 800; font-size: .77rem; }
.ring > span { width: 80%; aspect-ratio: 1; display: grid; place-items: center; border-radius: 50%; background: var(--paper); }
.empty-state, .notice { padding: 22px; }
.empty-state p { max-width: 52ch; margin-block: 9px 16px; }
.notice p { margin-bottom: 10px; }
.lesson-layout, .lesson-main, .lesson-side { display: grid; align-content: start; gap: 16px; min-width: 0; }
.lesson-panel { padding: 18px; }
.lesson-panel h2, .report h2, .book-card h2, .book-card h3, .results-card h2 { font-size: 1.26rem; }
.lesson-panel > p { margin-top: 14px; }
.section-bar { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px; }
.examples { display: grid; gap: 10px; margin-bottom: 0; padding-inline-start: 22px; color: var(--muted); }
.definitions { display: grid; gap: 12px; margin-top: 14px; }
.definitions > div { background: var(--bg); border: 1px solid var(--line); padding: 11px 13px; border-radius: 10px; }
.definitions dt { font-weight: 750; }
.definitions dd { color: var(--muted); font-size: .94rem; margin-top: 4px; }
.mind-map { margin-top: 16px; }
.mind-map figcaption { text-align: center; padding: 10px; background: var(--tint); color: var(--tint-ink); border-radius: 12px; font-weight: 750; }
.mind-map ul { list-style: none; margin: 0 0 0 15px; padding: 14px 0 0 15px; border-left: 2px solid var(--tab); display: grid; gap: 8px; }
.mind-map li { position: relative; border: 1px solid var(--line); border-radius: 9px; padding: 6px 9px; font-size: .91rem; line-height: 1.4; }
.mind-map li::before { content: ""; position: absolute; width: 15px; height: 2px; background: var(--tab); top: 50%; right: 100%; }
.practice-panel { display: grid; gap: 11px; }
.practice-panel > .button { width: 100%; }
.lesson-books { margin-top: 4px; padding-top: 12px; border-top: 1px solid var(--line); }
.lesson-books h3 { font-size: 1.03rem; }
.lesson-books .text-link { display: inline-block; font-size: .9rem; margin-top: 10px; }
.book-card { padding: 16px; min-width: 0; border-top: 4px solid var(--tab); }
.book-links { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 11px 0 0; }
.reading-page { max-width: 780px; }
.reading-page .lesson-panel h2:not(:first-child) { margin-top: 24px; }
.about-page { max-width: 900px; }
.author-profile { margin-bottom: 20px; }
.author-intro { display: grid; gap: 14px; align-items: start; }
.author-intro h2 { margin: 0; }
.author-portrait {
  display: block;
  width: min(100%, 230px);
  height: auto;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  margin-inline: auto;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--section);
}
.author-work-heading { margin-top: 16px; }
.author-work {
  display: grid;
  gap: 10px 28px;
  margin: 8px 0 16px;
  padding-inline-start: 22px;
  color: var(--muted);
}
.author-work strong, .author-credit strong { color: var(--ink); }
.author-credit { margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--line); }
@media (min-width: 660px) {
  .author-intro { grid-template-columns: minmax(0, 1fr) minmax(0, 230px); grid-template-rows: auto 1fr; column-gap: 26px; row-gap: 10px; }
  .author-intro h2, .author-intro p { grid-column: 1; }
  .author-portrait { grid-column: 2; grid-row: 1 / span 2; }
  .author-work { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
.quiz-page { max-width: 740px; }
.quiz-card, .results-card { padding: 20px; }
.quiz-meta { display: flex; justify-content: space-between; align-items: baseline; gap: 7px; color: var(--muted); font-size: .86rem; font-weight: 740; }
progress { display: block; appearance: none; width: 100%; height: 8px; border: 0; border-radius: 10px; background: var(--line); overflow: hidden; }
progress::-webkit-progress-bar { background: var(--line); }
progress::-webkit-progress-value { background: var(--accent); border-radius: 10px; }
progress::-moz-progress-bar { background: var(--accent); border-radius: 10px; }
.quiz-card > progress { margin: 10px 0 20px; }
.quiz-kind { font-weight: 680; font-size: .87rem; color: var(--accent); margin-bottom: 5px; }
.quiz-card h1 { font-size: clamp(1.4rem,3vw,2rem); margin-bottom: 18px; }
.quiz-card form { display: grid; gap: 15px; justify-items: start; }
.options { border: 0; padding: 0; margin: 0; display: grid; gap: 9px; width: 100%; min-width: 0; }
.quiz-option { display: flex; align-items: center; gap: 10px; min-height: 48px; border: 1px solid var(--line); border-radius: 11px; padding: 8px 11px; cursor: pointer; }
.quiz-option:has(:checked) { border-color: var(--accent); background: var(--accent-soft); }
.quiz-option input { accent-color: var(--accent); width: 17px; height: 17px; margin: 0; flex: 0 0 auto; }
.quiz-option span { overflow-wrap: anywhere; }
.quiz-option.correct, .feedback.correct, .level.strong { background: #def1e5; color: #21563d; border-color: #a3cbb1; }
.quiz-option.incorrect, .feedback.incorrect, .level.revise { background: #f8e3e8; color: #812b42; border-color: #d8a6b4; }
.feedback { width: 100%; border: 1px solid; border-radius: 12px; padding: 12px 14px; }
.feedback p { color: inherit; margin-top: 4px; }
.answer-label { font-weight: 700; margin-bottom: -9px; }
#typed { width: 100%; border-radius: 11px; background: var(--bg); padding: 11px; border: 1px solid var(--line); }
.result-top { display: flex; align-items: center; gap: 16px; margin-bottom: 23px; }
.result-top h1 { font-size: clamp(1.5rem,4vw,2.5rem); }
.result-top p:last-child { margin-top: 5px; }
.result-ring { width: clamp(76px,16vw,119px); font-size: clamp(1.15rem,4vw,2rem); }
.mastery-list { list-style: none; padding: 0; display: grid; gap: 14px; }
.mastery-list li > div { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 3px 7px; margin-bottom: 5px; }
.level { padding: 4px 8px; border-radius: 99px; font-size: .79rem; line-height: 1.35; font-weight: 750; display: inline-block; }
.level.practice { background: #f6e7c5; color: #694916; }
.level.untested { background: var(--section); color: var(--muted); }
.next-step { background: var(--bg); padding: 14px; border-radius: 12px; margin-top: 22px; }
.next-step p { margin-top: 5px; }
.next-step .button { margin-top: 11px; }
.stats-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 8px; margin-bottom: 15px; }
.stat { padding: 10px; display: grid; gap: 4px; align-content: start; border-top: 4px solid var(--tab); }
.stat strong { color: var(--accent); font-size: clamp(1.4rem,5vw,2.35rem); line-height: 1.2; }
.stat span { font-size: .85rem; line-height: 1.42; overflow-wrap: anywhere; }
.report { padding: 16px; }
.report p { margin-top: 9px; }
.report ul { list-style: none; padding: 0; margin: 8px 0 0; }
.report li { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; padding-block: 9px; border-top: 1px solid var(--line); }
.report li a { font-weight: 700; }
.report li a:hover { color: var(--accent); text-decoration: underline; }
.report li small { display: block; color: var(--muted); font-weight: 500; }
.report li .level { max-width: 42%; text-align: center; }
dialog { max-width: min(440px,calc(100vw - 32px)); border: 1px solid var(--line); border-radius: 17px; background: var(--paper); color: var(--ink); padding: 22px; box-shadow: var(--shadow); }
dialog::backdrop { background: #171123a0; }
dialog p { margin-top: 10px; }
:lang(ta) .hero h1, :lang(ta) .page-heading h1, :lang(ta) .library-heading h2, :lang(ta) .how h2 { letter-spacing: normal; line-height: 1.35; }
:lang(ta) .hero h1 { font-size: clamp(2rem, 5.3vw, 3.9rem); max-width: none; }
:lang(ta) .eyebrow { letter-spacing: 0; }
@media (min-width: 540px) {
  .wrap { width: min(100% - 56px, 1160px); }
  .folder-grid { grid-template-columns: repeat(3,minmax(0,1fr)); }
  .chapter-grid, .book-grid, .report-grid, .definitions, .steps { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .stat, .lesson-panel, .quiz-card, .results-card, .report { padding: 22px; }
}
@media (min-width: 760px) {
  :root { --nav-height: 76px; }
  .header-inner { min-height: 72px; display: flex; justify-content: space-between; padding-block: 0; gap: 18px; }
  .site-header nav { gap: 14px; }
  .site-header nav a { font-size: .95rem; }
  .language button { font-size: .84rem; padding-inline: 10px; }
  .hero { grid-template-columns: 1.02fr 1fr; padding-block: 44px 49px; gap: clamp(24px,5vw,70px); }
  .hero h1 { font-size: clamp(3.4rem,6.2vw,5.15rem); }
  .hero-figure { border-radius: 26px; }
  .folder-grid { grid-template-columns: repeat(4,minmax(0,1fr)); }
  .folder { padding: 15px 14px 13px; }
  .folder-art { height: 83px; }
  .folder-front { padding-inline: 14px; }
  .folder-symbol { font-size: 1.95rem; }
  .inner-page { padding-block: 36px 65px; }
  .lesson-layout { grid-template-columns: minmax(0,1fr) minmax(230px, 30%); }
}
@media (min-width: 1040px) {
  .site-header nav { gap: 24px; }
  .folder-grid { grid-template-columns: repeat(5,minmax(0,1fr)); gap: 16px; }
  .steps { grid-template-columns: repeat(4,minmax(0,1fr)); }
  .book-grid, .report-grid { grid-template-columns: repeat(3,minmax(0,1fr)); }
  .class-library { padding-block: 35px 46px; }
}
@media (max-width: 365px) {
  .wrap { width: min(100% - 24px, 1160px); }
  .hero h1 { font-size: 2.32rem; }
  .language button { padding-inline: 6px; }
  .site-header nav a { font-size: .78rem; }
  .chapter-card { padding: 11px; gap: 8px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0s !important; animation-duration: 0s !important; }
  .folder:hover,.chapter-card:hover,.button:active,.folder:is(:hover,:active,:focus-visible) .folder-front { transform:none; }
  .folder:is(:hover,:active,:focus-visible) .folder-paper { transform:rotate(-4deg); }
}