/* Layout: landing page — sticky bar, hero with a live teaser sitting under a mock article, then stacked sections at one reading width */
:root {
  --bg: #f6f7fb; --surface: #ffffff; --ink: #14182b; --muted: #596078; --line: #dde0ea;
  --accent: #2f4de0; --accent-ink: #ffffff; --pop: #ffcc33; --pop-ink: #14182b;
  --ok: #1d7a4a; --err: #b3261e;
  --f-display: "Dela Gothic One", "Arial Black", Impact, system-ui, sans-serif;
  --f-body: "Manrope", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --f-deva: "Noto Sans Devanagari", "Nirmala UI", "Mangal", system-ui, sans-serif;
  --f-han: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, sans-serif;
  --radius: 10px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1220; --surface: #181c2e; --ink: #e8eaf3; --muted: #a2a8c0; --line: #2a3048;
    --accent: #8ea0ff; --accent-ink: #0f1220; --pop: #ffd45c; --pop-ink: #14182b;
    --ok: #6fd39c; --err: #ff8a80; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0f1220; --surface: #181c2e; --ink: #e8eaf3; --muted: #a2a8c0; --line: #2a3048;
  --accent: #8ea0ff; --accent-ink: #0f1220; --pop: #ffd45c; --pop-ink: #14182b;
  --ok: #6fd39c; --err: #ff8a80; color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-padding-top: 80px; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.6 var(--f-body); -webkit-text-size-adjust: 100%; }
:lang(hi) { font-family: var(--f-deva); }
:lang(zh) { font-family: var(--f-han); }
:lang(hi) h1, :lang(hi) h2, :lang(zh) h1, :lang(zh) h2 { font-family: inherit; font-weight: 700; }
a { color: var(--accent); text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
h1, h2, h3 { text-wrap: balance; margin: 0; }
p { margin: 0; }
img { max-width: 100%; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }

/* Bar */
.bar { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); padding-top: env(safe-area-inset-top, 0px); }
.bar-in { max-width: 1120px; margin: 0 auto; padding: 12px 20px; display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
.logo { display: inline-flex; align-items: center; gap: 10px; font: 18px/1 var(--f-display); color: var(--ink); text-decoration: none; }
.logo-mark { display: grid; grid-template-columns: repeat(2, 9px); gap: 2px; }
.logo-mark i { width: 9px; height: 9px; background: var(--ink); }
.logo-mark i:first-child { background: var(--accent); }
.logo-mark i:last-child { background: var(--pop); }
.nav { display: flex; gap: 18px; flex-wrap: wrap; margin-left: auto; font-size: 14px; font-weight: 500; }
.nav a { color: var(--muted); text-decoration: none; }
.nav a:hover { color: var(--ink); }
.langs { display: flex; border: 1px solid var(--line); border-radius: 999px; padding: 3px; background: var(--surface); }
.langs button { font: 600 12px/1 var(--f-body); background: none; border: 0; color: var(--muted); padding: 7px 10px; border-radius: 999px; cursor: pointer; }
.langs button[lang="hi"] { font-family: var(--f-deva); }
.langs button[lang="zh"] { font-family: var(--f-han); }
.langs button[aria-pressed="true"] { background: var(--ink); color: var(--bg); }
@media (max-width: 860px) { .nav { display: none; } .langs { margin-left: auto; } }

/* Shared */
main { max-width: 1120px; margin: 0 auto; padding-inline: 20px; }
@media (max-width: 520px) { main, .bar-in { padding-inline: 16px; } }
.block { padding-block: 72px 8px; display: grid; gap: 20px; }
.block h2 { font: 32px/1.15 var(--f-display); letter-spacing: -.005em; }
.section-lede { color: var(--muted); font-size: 18px; max-width: 64ch; }
.sub { font-size: 20px; font-weight: 700; margin-top: 20px; }
.fine { color: var(--muted); font-size: 13px; max-width: 70ch; }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 0 22px; border-radius: 999px; font: 700 15px/1.2 var(--f-body); text-decoration: none; border: 2px solid transparent; cursor: pointer; }
:lang(hi) .btn { font-family: var(--f-deva); } :lang(zh) .btn { font-family: var(--f-han); }
.btn-main { background: var(--accent); color: var(--accent-ink); }
.btn-main:hover { filter: brightness(1.08); }
.btn-main[disabled] { opacity: .6; cursor: progress; }
.btn-ghost { border-color: var(--ink); color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: var(--bg); }

/* Hero */
.hero { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); gap: 56px; align-items: center; padding-block: 64px 24px; }
@media (max-width: 900px) { .hero { grid-template-columns: minmax(0, 1fr); gap: 36px; padding-block: 36px 8px; } }
.hero-copy { display: grid; gap: 20px; }
.eyebrow { font-size: 13px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--accent); }
:lang(zh) .eyebrow, :lang(hi) .eyebrow { letter-spacing: .02em; }
h1 { font: clamp(34px, 5.4vw, 60px)/1.05 var(--f-display); letter-spacing: -.01em; }
:lang(hi) h1 { line-height: 1.3; } :lang(zh) h1 { line-height: 1.25; }
.lede { font-size: 19px; color: var(--muted); max-width: 56ch; }
.ctas { display: flex; flex-wrap: wrap; gap: 12px; }
.note { font-size: 14px; color: var(--muted); }
.hero-demo { display: grid; gap: 16px; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 24px; box-shadow: 0 18px 50px -24px color-mix(in srgb, var(--ink) 35%, transparent); min-width: 0; }
.article-mock { display: grid; gap: 9px; }
.line { display: block; height: 9px; border-radius: 5px; background: var(--line); }
.w100 { width: 100%; } .w95 { width: 95%; } .w90 { width: 90%; } .w70 { width: 70%; } .w60 { width: 60%; }

/* Steps */
.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
@media (max-width: 860px) { .steps { grid-template-columns: minmax(0, 1fr); } }
.steps li { display: grid; gap: 10px; align-content: start; padding-top: 18px; border-top: 3px solid var(--ink); min-width: 0; }
.step-n { font: 28px/1 var(--f-display); color: var(--accent); }
.steps h3 { font-size: 20px; }
.steps p { color: var(--muted); }
.snippet { margin: 4px 0 0; background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 12px; overflow-x: auto; font: 12.5px/1.5 ui-monospace, Consolas, monospace; }

/* Teasers */
.teasers { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 28px 24px; }
@media (max-width: 400px) { .teasers { grid-template-columns: minmax(0, 1fr); } }
.teaser-wrap { display: grid; gap: 8px; align-content: start; min-width: 0; }
.cap { display: flex; flex-wrap: wrap; gap: 6px 10px; align-items: center; font-size: 13px; color: var(--muted); }
.chip { font-size: 11px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; padding: 4px 8px; border-radius: 4px; background: var(--ink); color: var(--bg); }
.chip-lang { background: transparent; color: var(--muted); border: 1px solid var(--line); }
.teaser { display: grid; gap: 10px; background: var(--surface); border: 1px solid var(--line); border-top: 4px solid var(--ink); border-radius: 0 0 var(--radius) var(--radius); padding: 18px 20px 20px; }
.teaser-top { display: flex; align-items: center; gap: 8px; font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); }
.teaser:lang(hi) .teaser-top, .teaser:lang(zh) .teaser-top { letter-spacing: .02em; }
.tile { display: grid; grid-template-columns: repeat(2, 6px); gap: 2px; }
.tile i { width: 6px; height: 6px; background: var(--accent); }
.tile i:nth-child(4) { background: var(--pop); }
.teaser h3 { font-size: 21px; line-height: 1.25; }
.teaser p { color: var(--muted); font-size: 15px; }
.teaser-foot { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; margin-top: 4px; }
.play { min-height: 40px; padding: 0 18px; font-size: 14px; background: var(--pop); color: var(--pop-ink); border: 0; }
.play:hover { filter: brightness(1.05); }
.sponsor { font-size: 12px; color: var(--muted); border: 1px dashed var(--line); padding: 4px 8px; border-radius: 4px; }

/* Offer */
.offer-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 24px; align-items: start; }
@media (max-width: 860px) { .offer-grid { grid-template-columns: minmax(0, 1fr); } }
.pilot { background: var(--ink); color: var(--bg); border-radius: 14px; padding: 28px; display: grid; gap: 16px; }
.pilot h3 { font-size: 22px; }
.ticks { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.ticks li { position: relative; padding-left: 26px; }
.ticks li::before { content: ""; position: absolute; left: 0; top: .5em; width: 12px; height: 12px; background: var(--pop); }
.models { display: grid; gap: 12px; }
.model { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; display: grid; gap: 6px; }
.model h3 { font-size: 18px; }
.model p { color: var(--muted); }
.timeline { list-style: none; counter-reset: s; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
@media (max-width: 860px) { .timeline { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }
@media (max-width: 480px) { .timeline { grid-template-columns: minmax(0, 1fr); } }
.timeline li { counter-increment: s; display: grid; gap: 6px; padding: 14px 0 0; border-top: 2px solid var(--line); font-weight: 500; }
.timeline li::before { content: counter(s); font: 20px/1 var(--f-display); color: var(--accent); }
.promise { border-left: 4px solid var(--pop); padding: 6px 0 6px 16px; max-width: 72ch; }
.regions { margin: 0; display: grid; gap: 0; }
.regions div { display: grid; grid-template-columns: 140px minmax(0, 1fr); gap: 16px; padding: 12px 0; border-bottom: 1px solid var(--line); }
.regions dt { font-weight: 700; }
.regions dd { margin: 0; color: var(--muted); }
@media (max-width: 480px) { .regions div { grid-template-columns: minmax(0, 1fr); gap: 2px; } }

/* Forms */
.form-block { grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: 40px; align-items: start; }
@media (max-width: 860px) { .form-block { grid-template-columns: minmax(0, 1fr); gap: 20px; } }
.form-head { display: grid; gap: 14px; }
.form { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 24px; }
@media (max-width: 560px) { .form { grid-template-columns: minmax(0, 1fr); padding: 18px; } }
.wide { grid-column: 1 / -1; }
.field { display: grid; gap: 6px; font-size: 14px; font-weight: 600; }
.field input, .field select, .field textarea { font: 400 16px/1.4 inherit; font-family: inherit; color: var(--ink); background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 11px 12px; width: 100%; min-width: 0; }
.field textarea { resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { outline: 2px solid var(--accent); outline-offset: 0; border-color: transparent; }
.field [aria-invalid="true"] { border-color: var(--err); }
.check { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; color: var(--muted); }
.check input { margin-top: 3px; width: 18px; height: 18px; accent-color: var(--accent); flex: none; }
.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 18px; }
.status { font-size: 14px; }
.status.ok { color: var(--ok); font-weight: 600; }
.status.err { color: var(--err); }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }

/* Footer */
.foot { max-width: 1120px; margin: 80px auto 0; padding: 24px 20px calc(32px + env(safe-area-inset-bottom, 0px)); border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; color: var(--muted); font-size: 14px; }

/* Quiz dialog */
dialog { border: 0; padding: 0; border-radius: 14px; background: var(--surface); color: var(--ink); width: min(480px, calc(100vw - 32px)); box-shadow: 0 30px 80px -20px rgba(0,0,0,.45); }
dialog::backdrop { background: rgba(10, 12, 24, .55); }
.quiz-in { display: grid; gap: 16px; padding: 24px; }
.quiz-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.quiz-progress { display: flex; gap: 4px; }
.quiz-progress i { width: 22px; height: 6px; border-radius: 3px; background: var(--line); }
.quiz-progress i.done { background: var(--accent); }
.x { background: none; border: 0; font-size: 22px; line-height: 1; color: var(--muted); cursor: pointer; padding: 4px 8px; }
.quiz-q { font-size: 19px; font-weight: 700; line-height: 1.4; }
.quiz-btns { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.quiz-btns .btn { border-color: var(--line); background: var(--bg); color: var(--ink); }
.quiz-btns .btn:hover { border-color: var(--ink); }
.quiz-fb { min-height: 1.6em; font-size: 15px; }
.quiz-fb.ok { color: var(--ok); } .quiz-fb.err { color: var(--err); }
.quiz-score { font: 44px/1 var(--f-display); }
:lang(hi) .quiz-score, :lang(zh) .quiz-score { font-family: inherit; font-weight: 700; }