/* Muppadai Learn: course marketplace for the Muppadai app. Brand navy and gold, Inter. */
@font-face { font-family: "Inter Variable"; font-style: normal; font-weight: 100 900; font-display: swap; src: url(/assets/inter.woff2) format("woff2"); }
:root {
  --night: #0f1036; --night-2: #17184a; --brand: #31328f; --brand-strong: #24256f; --brand-soft: #eef0fb; --brand-line: #d6d9f3;
  --gold: #f8d82f; --gold-strong: #ecc800; --gold-soft: #fff8d4; --on-gold: #1c1d2e;
  --ink: #161a2c; --text: #2c3145; --muted: #5a6077; --line: #e5e7ef; --line-strong: #cfd3df;
  --bg: #f5f6fb; --white: #fff; --green: #12775a; --green-soft: #e6f4ee; --star: #f5a623;
  --r-s: 10px; --r: 14px; --r-l: 20px;
  --shadow-1: 0 1px 2px rgba(16, 18, 54, .06), 0 2px 8px rgba(16, 18, 54, .05);
  --shadow-2: 0 18px 40px rgba(16, 18, 54, .14);
  --fs-xs: 12px; --fs-sm: 13px; --fs-body: 15px; --fs-lead: 17px; --fs-h4: 18px; --fs-h3: 22px; --fs-h2: 30px; --fs-h1: 44px;
  --font: "Inter Variable", Inter, system-ui, -apple-system, "Segoe UI", Roboto, Arial, "Noto Sans Tamil", "Nirmala UI", sans-serif;
}
@media (max-width: 1023px) { :root { --fs-lead: 16px; --fs-h4: 17px; --fs-h3: 20px; --fs-h2: 26px; --fs-h1: 36px; } }
@media (max-width: 639px) { :root { --fs-xs: 11px; --fs-sm: 12px; --fs-body: 14px; --fs-lead: 15px; --fs-h4: 16px; --fs-h3: 18px; --fs-h2: 22px; --fs-h1: 27px; } }

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 130px; scroll-behavior: smooth; }
body { margin: 0; font: 400 var(--fs-body)/1.6 var(--font); color: var(--text); background: var(--white); -webkit-font-smoothing: antialiased; }
img, svg { display: block; max-width: 100%; }
a { color: var(--brand); text-decoration: none; }
h1, h2, h3 { margin: 0; color: var(--ink); line-height: 1.2; letter-spacing: -.02em; }
h1 { font-size: var(--fs-h1); font-weight: 800; letter-spacing: -.035em; text-wrap: balance; }
h2 { font-size: var(--fs-h2); font-weight: 800; letter-spacing: -.03em; }
h3 { font-size: var(--fs-h4); font-weight: 750; }
p { margin: 0 0 12px; }
ul, ol { margin: 0; padding: 0; list-style: none; }
:focus-visible { outline: 3px solid var(--gold); outline-offset: 2px; border-radius: 6px; }
.i { width: 18px; height: 18px; flex-shrink: 0; }
.wrap { width: min(1240px, calc(100% - 64px)); margin: 0 auto; }
.narrow { width: min(860px, calc(100% - 64px)); }
.muted { color: var(--muted); }
.small { font-size: var(--fs-sm); }
.center { margin-top: 28px; text-align: center; }
.row { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-top: 20px; }
.skip { position: absolute; left: 12px; top: -60px; z-index: 300; padding: 10px 14px; background: #fff; }
.skip:focus { top: 10px; }
.preview-bar { padding: 8px 16px; background: var(--gold); color: var(--on-gold); font-size: var(--fs-sm); font-weight: 700; text-align: center; }
.link { display: inline-flex; align-items: center; gap: 6px; font-weight: 700; }
.link .i { width: 16px; height: 16px; }
.link:hover { text-decoration: underline; text-underline-offset: 3px; }

/* Buttons and stores */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 46px; padding: 0 22px; border: 0; border-radius: 12px; font: inherit; font-weight: 750; white-space: nowrap; cursor: pointer; transition: background .2s, transform .2s; }
.btn .i { width: 18px; height: 18px; }
.btn-lg { min-height: 54px; font-size: var(--fs-lead); }
.btn-block { display: flex; width: 100%; }
.btn-gold { background: var(--gold); color: var(--on-gold); }
.btn-gold:hover { background: var(--gold-strong); }
.btn-ghost { border: 1.5px solid var(--brand); color: var(--brand); background: #fff; }
.btn-ghost:hover { background: var(--brand-soft); }
.store { display: inline-flex; align-items: center; gap: 10px; min-height: 52px; padding: 0 18px 0 14px; border-radius: 12px; background: #000; color: #fff; }
.store-i { width: 26px; height: 26px; }
.store span { display: flex; flex-direction: column; line-height: 1.1; }
.store small { font-size: 10px; font-weight: 600; letter-spacing: .02em; }
.store strong { font-size: 18px; font-weight: 600; }
.store-light { background: rgba(255, 255, 255, .1); border: 1px solid rgba(255, 255, 255, .25); }

/* Header */
.hd { position: sticky; top: 0; z-index: 100; background: rgba(255, 255, 255, .97); border-bottom: 1px solid var(--line); backdrop-filter: blur(12px); }
.hd-row { display: flex; align-items: center; gap: 22px; min-height: 72px; }
.logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; color: var(--ink); }
.logo img { width: 40px; height: 40px; border-radius: 11px; box-shadow: var(--shadow-1); }
.logo span { display: flex; flex-direction: column; line-height: 1.15; }
.logo strong { font-size: 19px; white-space: nowrap; font-weight: 850; letter-spacing: -.03em; }
.logo strong b { color: var(--brand); font-weight: 850; }
.logo small { color: var(--muted); font-size: var(--fs-xs); font-weight: 500; }
.search { position: relative; flex: 1; max-width: 440px; display: flex; align-items: center; gap: 10px; height: 46px; padding: 0 16px; border: 1px solid var(--line-strong); border-radius: 999px; background: var(--bg); }
.search:focus-within { border-color: var(--brand); background: #fff; box-shadow: 0 0 0 4px var(--brand-soft); }
.search .i { color: var(--muted); }
.search input { flex: 1; min-width: 0; border: 0; background: none; font: inherit; color: var(--ink); outline: none; }
.search-results { position: absolute; top: calc(100% + 8px); left: 0; right: 0; z-index: 50; padding: 6px; border: 1px solid var(--line); border-radius: var(--r); background: #fff; box-shadow: var(--shadow-2); }
.search-results a { display: flex; flex-direction: column; padding: 9px 12px; border-radius: 8px; color: var(--ink); line-height: 1.3; }
.search-results a:hover, .search-results a[aria-selected="true"] { background: var(--brand-soft); }
.search-results small { color: var(--muted); font-size: var(--fs-xs); }
.search-results p { margin: 0; padding: 10px 12px; color: var(--muted); }
.nav { display: flex; align-items: center; gap: 20px; margin-left: auto; font-weight: 650; }
.nav a { color: var(--ink); white-space: nowrap; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--brand); }
.nav-login { padding: 9px 18px; border: 1px solid var(--line-strong); border-radius: 999px; }
.hd-app { min-height: 42px; padding: 0 16px; }
.nav-app { display: none; }
@media (max-width: 520px) { .nav .nav-app { display: block; margin-top: 10px; padding: 13px; border: 0; border-radius: 12px; background: var(--gold); color: var(--on-gold); text-align: center; } }
.menu { display: none; }
@media (max-width: 1180px) {
  .hd-row { gap: 12px; min-height: 64px; }
  .search { max-width: none; }
  .menu { display: flex; flex-direction: column; justify-content: center; gap: 4px; width: 44px; height: 44px; padding: 0 11px; border: 1px solid var(--line-strong); border-radius: 12px; background: #fff; cursor: pointer; flex-shrink: 0; }
  .menu span { height: 2px; background: var(--ink); border-radius: 2px; }
  .nav { display: none; position: absolute; top: 100%; left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0; margin: 0; padding: 6px 24px 18px; background: #fff; border-bottom: 1px solid var(--line); box-shadow: var(--shadow-2); }
  .nav.open { display: flex; }
  .nav a { padding: 13px 0; border-bottom: 1px solid var(--line); }
  .nav-login { margin-top: 12px; border-radius: 12px; text-align: center; background: var(--brand); color: #fff !important; }
}
@media (max-width: 760px) {
  .hd-row { flex-wrap: wrap; padding: 10px 0; }
  .search { order: 3; flex-basis: 100%; height: 42px; }
  .hd-app { margin-left: auto; }
  .logo small { display: none; }
}
@media (max-width: 520px) { .hd-app { display: none; } .menu { margin-left: auto; } .logo strong { font-size: 17px; } }

/* Home hero */
.hero { position: relative; overflow: hidden; background: var(--night); color: rgba(255, 255, 255, .82); }
.hero::after { content: ""; position: absolute; right: -200px; top: -240px; width: 720px; height: 720px; border-radius: 50%; background: var(--night-2); }
.hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); gap: 40px; align-items: center; padding: 64px 0 56px; }
.hero h1 { color: #fff; font-size: clamp(30px, 4.3vw, 54px); }
.hero-kicker { display: inline-flex; align-items: center; gap: 8px; margin-bottom: 18px; padding: 6px 14px; border-radius: 999px; background: rgba(255, 255, 255, .08); border: 1px solid rgba(255, 255, 255, .14); font-size: var(--fs-sm); font-weight: 600; color: #fff; }
.hero-kicker .i { width: 16px; height: 16px; color: var(--gold); }
.hero-lead { max-width: 600px; margin: 18px 0 26px; font-size: var(--fs-lead); }
.hero-search { position: relative; display: flex; align-items: center; gap: 10px; max-width: 600px; padding: 6px 6px 6px 18px; border-radius: 16px; background: #fff; box-shadow: var(--shadow-2); }
.hero-search .i { color: var(--muted); }
.hero-search input { flex: 1; min-width: 0; height: 46px; border: 0; font: inherit; font-size: var(--fs-lead); color: var(--ink); outline: none; }
.hero-exams { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.hero-exams a { display: inline-flex; align-items: center; gap: 8px; padding: 6px 14px 6px 6px; border-radius: 999px; background: rgba(255, 255, 255, .08); border: 1px solid rgba(255, 255, 255, .16); color: #fff; font-size: var(--fs-sm); font-weight: 650; }
.hero-exams a:hover { background: rgba(255, 255, 255, .16); }
.hero-exams img { width: 28px; height: 28px; border-radius: 50%; background: #fff; object-fit: contain; }
.hero-visual { position: relative; display: flex; justify-content: center; }
.phone { width: 250px; padding: 9px; border-radius: 38px; background: #05061c; box-shadow: 0 30px 60px rgba(0, 0, 0, .45); }
.phone img { width: 100%; height: auto; aspect-ratio: 9 / 15.5; object-fit: cover; object-position: top; border-radius: 30px; }
.phone-sm { width: 240px; }
.float { position: absolute; display: flex; flex-direction: column; padding: 12px 16px; border-radius: 14px; background: #fff; box-shadow: var(--shadow-2); color: var(--muted); font-size: var(--fs-xs); }
.float strong { color: var(--ink); font-size: var(--fs-h3); line-height: 1.1; }
.float-a { left: 0; top: 18%; }
.float-b { right: 0; bottom: 18%; }
@media (max-width: 960px) { .hero-grid { grid-template-columns: minmax(0, 1fr); padding: 40px 0 36px; } .hero-visual { display: none; } }

/* Stats band */
.stats { background: var(--night-2); color: rgba(255, 255, 255, .72); }
.stats-row { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); }
.stats-row div { display: flex; flex-direction: column; padding: 20px 24px; border-left: 1px solid rgba(255, 255, 255, .1); }
.stats-row div:first-child { border-left: 0; padding-left: 0; }
.stats strong { color: var(--gold); font-size: var(--fs-h3); font-weight: 800; }
.stats span { font-size: var(--fs-sm); }
@media (max-width: 760px) { .stats-row { grid-template-columns: repeat(2, minmax(0, 1fr)); } .stats-row div { padding: 14px 12px; } .stats-row div:nth-child(3) { border-left: 0; padding-left: 0; } }

/* Sections */
.sec { padding: 64px 0; }
.sec-tint { background: var(--bg); }
.sec-list { padding-top: 28px; }
.sec-head { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 14px 24px; margin-bottom: 24px; }
.sec-head p { margin: 6px 0 0; color: var(--muted); }
@media (max-width: 639px) { .sec { padding: 40px 0; } }

/* Exam tiles */
.exam-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.exam { display: flex; align-items: center; gap: 14px; padding: 18px; border: 1px solid var(--line); border-radius: var(--r-l); background: #fff; color: var(--ink); box-shadow: var(--shadow-1); transition: border-color .2s, transform .2s; }
.exam:hover { border-color: var(--brand); transform: translateY(-2px); }
.exam img { width: 56px; height: 56px; object-fit: contain; flex-shrink: 0; }
.exam span { display: flex; flex-direction: column; flex: 1; line-height: 1.3; }
.exam strong { font-size: var(--fs-h4); }
.exam small { color: var(--muted); font-size: var(--fs-sm); }
.exam > .i { color: var(--brand); }
@media (max-width: 1000px) { .exam-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 560px) { .exam-grid { grid-template-columns: minmax(0, 1fr); } }

/* Tabs */
.tabs { display: flex; gap: 4px; padding: 4px; border-radius: 999px; background: #fff; border: 1px solid var(--line); }
.tabs button { display: inline-flex; align-items: center; gap: 8px; min-height: 42px; padding: 0 18px; border: 0; border-radius: 999px; background: none; color: var(--text); font: inherit; font-weight: 650; cursor: pointer; white-space: nowrap; }
.tabs button span { padding: 0 8px; border-radius: 999px; background: var(--brand-soft); color: var(--brand); font-size: var(--fs-xs); }
.tabs button[aria-selected="true"] { background: var(--night); color: #fff; }
.tabs button[aria-selected="true"] span { background: rgba(255, 255, 255, .18); color: #fff; }
@media (max-width: 639px) { .tabs { width: 100%; } .tabs button { flex: 1; justify-content: center; padding: 0 8px; } .tabs button span { display: none; } }

/* Cards */
.grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 22px; }
.grid[hidden] { display: none; }
.card { position: relative; display: flex; flex-direction: column; min-width: 0; border: 1px solid var(--line); border-radius: var(--r-l); background: #fff; overflow: hidden; box-shadow: var(--shadow-1); transition: transform .2s, box-shadow .2s; }
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-2); }
.card-media { position: relative; display: block; aspect-ratio: 16 / 9; background: var(--brand-soft) url(/assets/logo-96.png) center / 48px no-repeat; }
.card-media img { width: 100%; height: 100%; object-fit: contain; }
.tag { position: absolute; left: 10px; top: 10px; padding: 3px 9px; border-radius: 7px; background: var(--green); color: #fff; font-size: var(--fs-xs); font-weight: 800; }
.tag-new { background: var(--gold); color: var(--on-gold); }
.tag-free { background: var(--brand); }
.card-body { display: flex; flex-direction: column; gap: 8px; flex: 1; padding: 14px 16px 16px; }
.card-kind { margin: 0; color: var(--brand); font-size: var(--fs-xs); font-weight: 750; text-transform: none; }
.card h3 { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; font-size: var(--fs-h4); }
.card h3 a { color: var(--ink); }
.card h3 a::after { content: ""; position: absolute; inset: 0; }
.card-rating { display: flex; align-items: center; gap: 6px; margin: 0; font-size: var(--fs-sm); }
.card-rating strong { color: var(--ink); }
.card-rating > span:last-child { color: var(--muted); }
.stars { color: var(--star); letter-spacing: 1px; }
.stars span { color: var(--line-strong); }
.meta { display: flex; flex-wrap: wrap; gap: 4px 12px; color: var(--muted); font-size: var(--fs-sm); }
.meta li { display: inline-flex; align-items: center; gap: 5px; }
.meta .i { width: 16px; height: 16px; color: var(--brand); }
.card-foot { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-top: auto; padding-top: 12px; border-top: 1px dashed var(--line-strong); }
.card-cta { position: relative; z-index: 1; display: inline-flex; align-items: center; gap: 4px; padding: 8px 12px; border-radius: 10px; background: var(--brand-soft); color: var(--brand); font-size: var(--fs-sm); font-weight: 750; }
.card:hover .card-cta { background: var(--brand); color: #fff; }
.card-cta .i { width: 15px; height: 15px; }
.price { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px; }
.price strong { color: var(--ink); font-size: var(--fs-h3); font-weight: 850; letter-spacing: -.02em; }
.price s { color: var(--muted); font-size: var(--fs-sm); }
.price em { padding: 2px 7px; border-radius: 6px; background: var(--green-soft); color: var(--green); font-size: var(--fs-xs); font-style: normal; font-weight: 800; }
.price-big strong { font-size: 34px; }
.price-big s { font-size: var(--fs-body); }
@media (max-width: 1150px) { .grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 860px) { .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; } }
@media (max-width: 560px) { .grid { grid-template-columns: minmax(0, 1fr); } }

/* Feature block */
.feature { display: grid; grid-template-columns: 340px minmax(0, 1fr); gap: 56px; align-items: center; }
.feature-visual { display: flex; justify-content: center; padding: 30px 0; border-radius: 28px; background: var(--night); }
.feature-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px 24px; margin-top: 22px; }
.feature-list li { display: flex; gap: 12px; }
.feature-list .i { width: 40px; height: 40px; padding: 9px; border-radius: 12px; background: var(--brand-soft); color: var(--brand); }
.feature-list span { display: flex; flex-direction: column; color: var(--muted); font-size: var(--fs-sm); }
.feature-list strong { color: var(--ink); font-size: var(--fs-body); }
@media (max-width: 900px) { .feature { grid-template-columns: minmax(0, 1fr); gap: 28px; } .feature-visual { display: none; } }
@media (max-width: 560px) { .feature-list { grid-template-columns: minmax(0, 1fr); } }

/* Faculty */
.faculty { display: flex; flex-wrap: wrap; justify-content: center; gap: 24px 20px; }
.faculty li { display: flex; flex-direction: column; align-items: center; gap: 4px; width: 132px; text-align: center; }
.faculty img { width: 116px; height: 116px; margin-bottom: 8px; border-radius: 50%; object-fit: cover; object-position: 50% 10%; background: var(--gold-soft); box-shadow: 0 0 0 4px #fff, 0 0 0 6px var(--gold); }
.faculty strong { color: var(--ink); }
.faculty small { color: var(--muted); font-size: var(--fs-xs); }
.faculty-row { justify-content: flex-start; }
.faculty-lg li { width: 160px; }
.faculty-lg img { width: 136px; height: 136px; }
@media (max-width: 639px) { .faculty li { width: 104px; } .faculty img { width: 88px; height: 88px; } }

/* Steps */
.steps { counter-reset: s; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.steps li { counter-increment: s; position: relative; display: flex; flex-direction: column; gap: 4px; padding: 22px 20px; border: 1px solid var(--line); border-radius: var(--r-l); background: #fff; box-shadow: var(--shadow-1); }
.steps li::before { content: counter(s); display: grid; place-items: center; width: 36px; height: 36px; margin-bottom: 10px; border-radius: 12px; background: var(--night); color: var(--gold); font-weight: 850; }
.steps strong { color: var(--ink); font-size: var(--fs-h4); }
.steps span { color: var(--muted); font-size: var(--fs-sm); }
@media (max-width: 900px) { .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 480px) { .steps { grid-template-columns: minmax(0, 1fr); } }

/* Dark bands (lists, inner pages) */
.band { background: var(--night); color: rgba(255, 255, 255, .78); padding: 22px 0 40px; }
.band h1 { margin: 14px 0 10px; color: #fff; }
.band p { max-width: 720px; font-size: var(--fs-lead); }
.crumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; font-size: var(--fs-sm); }
.crumbs a { color: var(--brand); font-weight: 600; }
.crumbs-dark { color: rgba(255, 255, 255, .6); }
.crumbs-dark a { color: #fff; }
.crumb-i { width: 14px; height: 14px; transform: rotate(-90deg); opacity: .6; }
.list-tools { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 24px; }
.list-tools p { margin: 0; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips button { display: inline-flex; align-items: center; gap: 8px; min-height: 42px; padding: 0 16px 0 8px; border: 1px solid var(--line-strong); border-radius: 999px; background: #fff; color: var(--text); font: inherit; font-weight: 650; cursor: pointer; }
.chips button:first-child { padding-left: 16px; }
.chips button img { width: 26px; height: 26px; border-radius: 50%; object-fit: contain; }
.chips button[aria-pressed="true"] { border-color: var(--night); background: var(--night); color: #fff; }
.group { margin-bottom: 44px; }
.group h2 { display: flex; align-items: center; gap: 10px; margin-bottom: 18px; font-size: var(--fs-h3); }
.group h2 img { width: 32px; height: 32px; object-fit: contain; }
.group[hidden], .card[hidden] { display: none; }
.search-note { padding: 12px 16px; border-radius: var(--r); background: var(--brand-soft); color: var(--brand-strong); font-weight: 600; }

/* Course page */
.course-hero { background: var(--night); color: rgba(255, 255, 255, .8); }
.course-hero-grid { padding: 22px 0 44px; }
.course-hero-copy { max-width: calc(100% - 420px); }
.badges { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 12px; }
.badge { padding: 4px 12px; border-radius: 999px; background: var(--gold); color: var(--on-gold); font-size: var(--fs-xs); font-weight: 800; }
.badge-line { background: none; border: 1px solid rgba(255, 255, 255, .3); color: #fff; }
.badge-gold { background: #fff; }
.course-hero h1 { color: #fff; font-size: clamp(28px, 3.4vw, 44px); }
.course-lead { margin: 14px 0 18px; font-size: var(--fs-lead); }
.course-facts { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 20px; font-size: var(--fs-sm); color: #fff; }
.course-facts > span { display: inline-flex; align-items: center; gap: 6px; }
.course-facts .i { width: 16px; height: 16px; color: var(--gold); }
.cf-rating { display: inline-flex; align-items: center; gap: 6px; color: #fff; }
.cf-rating strong { color: var(--gold); font-size: var(--fs-h4); }
.cf-rating > span:last-child { color: rgba(255, 255, 255, .7); text-decoration: underline; text-underline-offset: 3px; }
.in-app { color: rgba(255, 255, 255, .72) !important; }
.in-app strong { color: #fff; }
.course-grid { display: grid; grid-template-columns: minmax(0, 1fr) 380px; gap: 40px; align-items: start; }
.course-main { min-width: 0; padding: 0 0 56px; }
.ctabs { position: sticky; top: 72px; z-index: 20; display: flex; gap: 4px; margin: 0 0 8px; padding: 10px 0 0; background: #fff; border-bottom: 1px solid var(--line); overflow-x: auto; scrollbar-width: none; }
.ctabs::-webkit-scrollbar { display: none; }
.ctabs a { flex-shrink: 0; padding: 12px 16px; border-bottom: 3px solid transparent; color: var(--muted); font-weight: 700; }
.ctabs a[aria-current="true"], .ctabs a:hover { border-color: var(--brand); color: var(--brand); }
.panel { padding: 28px 0 8px; }
.panel h2 { margin: 6px 0 16px; font-size: var(--fs-h3); }
.panel h2 + * { margin-top: 0; }
.panel > h2:not(:first-child) { margin-top: 30px; }
.tiles { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin-bottom: 26px; }
.tiles li { display: flex; align-items: center; gap: 12px; padding: 14px; border: 1px solid var(--line); border-radius: var(--r); background: #fff; }
.tiles .i { width: 40px; height: 40px; padding: 9px; border-radius: 12px; background: var(--brand-soft); color: var(--brand); }
.tiles span { display: flex; flex-direction: column; line-height: 1.3; }
.tiles small { color: var(--muted); font-size: var(--fs-xs); }
.tiles strong { color: var(--ink); font-size: var(--fs-sm); }
.learn { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px 22px; padding: 22px; border: 1px solid var(--line); border-radius: var(--r-l); background: var(--bg); }
.learn li { display: flex; gap: 10px; }
.learn > li > .i { width: 22px; height: 22px; padding: 3px; border-radius: 50%; background: var(--green); color: #fff; margin-top: 1px; }
.learn li > span { display: flex; flex-direction: column; font-size: var(--fs-sm); color: var(--muted); }
.learn strong { color: var(--ink); font-size: var(--fs-body); }
.about p { margin-bottom: 10px; }
.notice { margin-top: 18px; padding: 12px 16px; border-radius: var(--r); background: var(--gold-soft); }
.content-sum { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-bottom: 14px; color: var(--muted); font-size: var(--fs-sm); font-weight: 600; }
.content-sum span { display: inline-flex; align-items: center; gap: 6px; }
.content-sum .i { width: 16px; height: 16px; color: var(--brand); }
.acc { display: grid; gap: 10px; }
.acc details { border: 1px solid var(--line); border-radius: var(--r); background: #fff; overflow: hidden; }
.acc details[open] { border-color: var(--brand-line); box-shadow: var(--shadow-1); }
.acc summary { display: flex; align-items: center; gap: 14px; min-height: 60px; padding: 12px 16px; cursor: pointer; list-style: none; }
.acc summary::-webkit-details-marker { display: none; }
.num { display: grid; place-items: center; flex-shrink: 0; width: 36px; height: 36px; border-radius: 10px; background: var(--brand-soft); color: var(--brand); font-size: var(--fs-sm); font-weight: 800; }
.sec-title { flex: 1; color: var(--ink); font-weight: 700; }
.sec-meta { color: var(--muted); font-size: var(--fs-sm); white-space: nowrap; }
.acc summary > .i { width: 18px; height: 18px; color: var(--muted); transition: transform .2s; }
.acc details[open] summary > .i { transform: rotate(180deg); }
.acc ol { border-top: 1px solid var(--line); }
.acc ol li { display: flex; align-items: center; gap: 12px; padding: 11px 16px 11px 66px; border-top: 1px solid var(--line); font-size: var(--fs-sm); }
.acc ol li:first-child { border-top: 0; }
.acc ol li > span, .acc ol li > a { flex: 1; color: var(--ink); }
.acc ol li small { color: var(--muted); white-space: nowrap; }
.acc ol .i { width: 16px; height: 16px; color: var(--muted); }
.acc-faq summary { min-height: 56px; }
.acc-faq details > p { padding: 0 16px 16px; color: var(--text); }
.demos { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.demos li { display: flex; flex-direction: column; gap: 6px; }
.demo-thumb { position: relative; display: block; border-radius: var(--r); overflow: hidden; }
.demo-thumb .i { position: absolute; inset: 0; margin: auto; width: 54px; height: 54px; color: #fff; }
.rv-top { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 26px; align-items: center; padding: 20px; border-radius: var(--r-l); background: var(--bg); margin-bottom: 18px; }
.rv-score { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.rv-score strong { color: var(--ink); font-size: 52px; line-height: 1; font-weight: 850; }
.rv-score .stars { font-size: 20px; }
.rv-score small { color: var(--muted); }
.rv-bars { display: grid; gap: 6px; }
.rv-bars li { display: grid; grid-template-columns: 36px 1fr 30px; gap: 10px; align-items: center; font-size: var(--fs-sm); color: var(--muted); }
.rv-bars i { height: 8px; border-radius: 99px; background: var(--line); overflow: hidden; }
.rv-bars b { display: block; height: 100%; background: var(--star); }
.rv-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.rv { margin: 0; padding: 18px; border: 1px solid var(--line); border-radius: var(--r); }
.rv-head { display: flex; align-items: center; gap: 10px; }
.rv-head > span:nth-child(2) { display: flex; flex-direction: column; flex: 1; line-height: 1.3; }
.rv-head small { color: var(--muted); font-size: var(--fs-xs); }
.avatar { display: grid; place-items: center; width: 38px; height: 38px; border-radius: 50%; background: var(--night); color: var(--gold); font-weight: 800; }
.rv blockquote { margin: 12px 0 0; color: var(--ink); }

/* Buy box */
.buybox { position: sticky; top: 92px; margin-top: -250px; z-index: 30; }
.buy { overflow: hidden; border: 1px solid var(--line); border-radius: 22px; background: #fff; box-shadow: var(--shadow-2); }
.buy-media { aspect-ratio: 16 / 9; background: var(--brand-soft); }
.buy-media img { width: 100%; height: 100%; object-fit: contain; }
.buy-body { display: flex; flex-direction: column; gap: 12px; padding: 22px; }
.save { margin: -6px 0 0; color: var(--green); font-weight: 700; font-size: var(--fs-sm); }
.buy-note { margin: -4px 0 4px; color: var(--muted); font-size: var(--fs-xs); text-align: center; }
.buy h3 { font-size: var(--fs-body); }
.includes { display: grid; gap: 9px; font-size: var(--fs-sm); }
.includes li { display: flex; align-items: center; gap: 10px; }
.includes .i { width: 18px; height: 18px; color: var(--brand); }
.buy-qr { display: flex; align-items: center; gap: 12px; padding: 12px; border-radius: 12px; background: var(--bg); }
.buy-qr img { width: 72px; height: 72px; flex-shrink: 0; padding: 4px; border-radius: 8px; background: #fff; }
.buy-qr small { color: var(--muted); font-size: var(--fs-xs); }
.buybar { display: none; }
@media (max-width: 1000px) {
  .course-hero-copy { max-width: none; }
  .course-grid { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .buybox { position: static; order: -1; margin: -20px 0 0; }
  .buy-media { display: none; }
  .ctabs { top: 64px; }
  .tiles { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 760px) {
  .ctabs { top: 112px; }
  html { scroll-padding-top: 170px; }
  .learn, .rv-list, .demos { grid-template-columns: minmax(0, 1fr); }
  .rv-top { grid-template-columns: minmax(0, 1fr); }
  .course-page { padding-bottom: 72px; }
  .buybar { position: fixed; left: 0; right: 0; bottom: 0; z-index: 120; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 16px calc(10px + env(safe-area-inset-bottom)); background: #fff; border-top: 1px solid var(--line); box-shadow: 0 -8px 24px rgba(16, 18, 54, .1); }
  .buybar .btn { min-height: 46px; padding: 0 28px; }
  .buy-qr { display: none; }
}
@media (max-width: 480px) { .tiles li { padding: 10px; gap: 8px; } .tiles .i { width: 34px; height: 34px; padding: 7px; } }

/* Footer */
.ft { padding: 0 0 26px; background: var(--night); color: rgba(255, 255, 255, .72); font-size: var(--fs-sm); }
.ft-app { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 18px; padding: 36px 0; border-bottom: 1px solid rgba(255, 255, 255, .12); }
.ft-app h2 { color: #fff; font-size: var(--fs-h3); }
.ft-app p { margin: 6px 0 0; }
.ft-app-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.ft-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.3fr; gap: 30px; padding: 36px 0; }
.ft-grid h3 { margin-bottom: 12px; color: #fff; font-size: var(--fs-body); }
.ft-grid a { color: rgba(255, 255, 255, .78); }
.ft-grid > div > a:not(.logo) { display: block; padding: 4px 0; }
.ft-grid a:hover { color: #fff; }
.logo-ft { margin-bottom: 14px; color: #fff; }
.logo-ft small { color: rgba(255, 255, 255, .65); }
.logo-ft strong b { color: var(--gold); }
.ft-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; padding-top: 18px; border-top: 1px solid rgba(255, 255, 255, .12); }
.ft-bottom span { display: flex; gap: 18px; }
.ft-bottom a { color: rgba(255, 255, 255, .7); }
@media (max-width: 860px) { .ft-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .ft-grid { grid-template-columns: minmax(0, 1fr); } .wrap, .narrow { width: calc(100% - 32px); } }

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .card, .exam, .btn { transition: none; } .card:hover, .exam:hover { transform: none; } }

/* Leaderboard */
.board { display: grid; gap: 8px; }
.board li { display: flex; align-items: center; gap: 12px; padding: 10px 14px; border: 1px solid var(--line); border-radius: var(--r); background: #fff; }
.board strong { flex: 1; color: var(--ink); }
.rank { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: var(--bg); color: var(--muted); font-weight: 800; font-size: var(--fs-sm); }
.rank-1 { background: var(--gold); color: var(--on-gold); }
.rank-2 { background: #e3e6ee; color: var(--ink); }
.rank-3 { background: #f1d6b8; color: #6b3f12; }
.score { color: var(--brand); font-weight: 800; }
.acc ol li > .free-tag, .free-tag { flex: none; color: #17733a; margin-left: 4px; padding: 2px 8px; border-radius: 999px; background: #e7f6ec; color: #17733a; font-size: var(--fs-xs, 12px); font-weight: 700; }
.score small { color: var(--muted); font-weight: 600; }