/* SellerTiger public website + learning center. Tokens follow the app (public/css/app.css); dark mode via [data-theme] (boot.js). */
:root {
  --font: "Plus Jakarta Sans", "Noto Sans Thai", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --bg: #FFFFFF; --bg-2: #F6F7FC; --bg-3: #EEEFF8; --card: #FFFFFF;
  --text: #16163A; --text-2: #4D5072; --text-3: #8387A6;
  --line: #E6E7F2; --line-2: #D4D6EA;
  --primary: #4F46E5; --primary-2: #4338CA; --primary-soft: #EEEDFF; --primary-ink: #312E81;
  --accent: #F97316; --accent-soft: #FFF0E4; --ok: #059669; --ok-soft: #DDF7EC; --warn: #B45309; --warn-soft: #FFF4DB; --info: #0369A1; --info-soft: #E0F2FE;
  --grad: linear-gradient(135deg, #6366F1 0%, #4F46E5 45%, #3B2CC4 100%);
  --hero-bg: radial-gradient(900px 480px at 85% -10%, #E3E2FF 0%, transparent 60%), radial-gradient(700px 420px at -5% 30%, #FFEBDD 0%, transparent 55%);
  --shadow-1: 0 1px 2px rgba(22,22,58,.06); --shadow-2: 0 10px 30px -12px rgba(22,22,58,.18); --shadow-3: 0 30px 70px -24px rgba(30,27,95,.35);
  --r: 14px; --r-lg: 20px; --wrap: 1200px;
  color-scheme: light;
}
:root[data-theme="dark"] {
  --bg: #0C0C18; --bg-2: #12122A; --bg-3: #1B1B36; --card: #15152C;
  --text: #ECECFA; --text-2: #A9ABCB; --text-3: #7A7DA3;
  --line: #24243F; --line-2: #33335A;
  --primary: #8B85FF; --primary-2: #A5A0FF; --primary-soft: #23214F; --primary-ink: #D6D3FF;
  --accent: #FB923C; --accent-soft: #3A220E; --ok: #34D399; --ok-soft: #0F3428; --warn: #FBBF24; --warn-soft: #3A2C0E; --info: #38BDF8; --info-soft: #0C2D3D;
  --hero-bg: radial-gradient(900px 480px at 85% -10%, #221F5C 0%, transparent 60%), radial-gradient(700px 420px at -5% 30%, #2A1A0C 0%, transparent 55%);
  --shadow-2: 0 10px 30px -12px rgba(0,0,0,.6); --shadow-3: 0 30px 70px -24px rgba(0,0,0,.8);
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 84px; }
body { margin: 0; font-family: var(--font); color: var(--text); background: var(--bg); font-size: 16px; line-height: 1.6; -webkit-font-smoothing: antialiased; overflow-x: hidden; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { line-height: 1.2; margin: 0 0 .5em; letter-spacing: -.01em; }
[lang="th"] h1, [lang="th"] h2, [lang="th"] h3 { line-height: 1.35; letter-spacing: 0; }
/* Thai: no tracking anywhere (docs/i18n/style-guide.md §5); buttons get a Thai-safe line-height */
html[lang="th"] body *:not(svg *) { letter-spacing: normal !important; }
html[lang="th"] :is(.btn, .icon-btn, .nav > a, .nav-dd-btn) { line-height: 1.4; }
p { margin: 0 0 1em; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }
.center { text-align: center; }
.grow { flex: 1; }
.ic { width: 20px; height: 20px; flex: none; }
.skip { position: absolute; left: -999px; top: 8px; z-index: 100; background: var(--card); padding: 8px 12px; border-radius: 8px; }
.skip:focus { left: 8px; }
:focus-visible { outline: 3px solid color-mix(in srgb, var(--primary) 45%, transparent); outline-offset: 2px; border-radius: 6px; }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 40px; padding: 0 16px; border-radius: 10px; border: 1px solid transparent; font: 600 14.5px/1 var(--font); cursor: pointer; white-space: nowrap; text-decoration: none !important; transition: background .15s, border-color .15s, transform .15s, box-shadow .15s; }
.btn .ic { width: 16px; height: 16px; }
.btn.primary { background: var(--primary); color: #fff; box-shadow: 0 6px 18px -8px color-mix(in srgb, var(--primary) 80%, transparent); }
:root[data-theme="dark"] .btn.primary { color: #0C0C18; }
.btn.primary:hover { background: var(--primary-2); transform: translateY(-1px); }
.btn.ghost { background: var(--card); color: var(--text); border-color: var(--line-2); }
.btn.ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn.lg { height: 50px; padding: 0 24px; font-size: 16px; border-radius: 12px; }
.btn.block { width: 100%; }
.btn.on-dark { background: transparent; color: #fff; border-color: rgba(255,255,255,.4); }
.btn.on-dark:hover { border-color: #fff; color: #fff; }
.icon-btn { display: inline-flex; align-items: center; gap: 6px; height: 38px; min-width: 38px; justify-content: center; padding: 0 8px; border-radius: 10px; border: 1px solid transparent; background: transparent; color: var(--text-2); cursor: pointer; font: 600 13.5px var(--font); text-decoration: none !important; }
.icon-btn:hover { background: var(--bg-3); color: var(--text); }
.i-moon { display: none; } :root[data-theme="dark"] .i-sun { display: none; } :root[data-theme="dark"] .i-moon { display: block; }
.eyebrow { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 700; color: var(--primary); background: var(--primary-soft); padding: 5px 12px; border-radius: 99px; margin-bottom: 18px; }
.eyebrow .ic { width: 15px; height: 15px; }
.lead { font-size: 18.5px; color: var(--text-2); max-width: 640px; }
.fine { font-size: 13.5px; color: var(--text-3); margin-top: 18px; }
.link-arrow { display: inline-flex; align-items: center; gap: 6px; font-weight: 700; }
.link-arrow .ic { width: 16px; height: 16px; }
.ticks { list-style: none; padding: 0; margin: 0 0 20px; display: grid; gap: 10px; }
.ticks li { display: flex; gap: 10px; align-items: flex-start; color: var(--text-2); }
.ticks .ic { width: 18px; height: 18px; color: var(--ok); margin-top: 3px; }

/* header */
.hdr { position: sticky; top: 0; z-index: 50; background: color-mix(in srgb, var(--bg) 82%, transparent); backdrop-filter: saturate(160%) blur(14px); -webkit-backdrop-filter: saturate(160%) blur(14px); border-bottom: 1px solid transparent; transition: border-color .2s, box-shadow .2s; }
.hdr.scrolled { border-bottom-color: var(--line); box-shadow: var(--shadow-1); }
.hdr-in { display: flex; align-items: center; gap: 20px; height: 68px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; color: var(--text); text-decoration: none !important; letter-spacing: -.02em; }
.nav { display: flex; align-items: center; gap: 4px; flex: 1; }
.nav > a, .nav-dd-btn { color: var(--text-2); font-weight: 600; font-size: 14.5px; padding: 8px 12px; border-radius: 9px; text-decoration: none !important; background: none; border: 0; cursor: pointer; font-family: var(--font); display: inline-flex; align-items: center; gap: 4px; }
.nav > a:hover, .nav-dd-btn:hover, .nav > a.on, .nav-dd-btn.on { color: var(--text); background: var(--bg-3); }
.dd-car { width: 14px; height: 14px; transform: rotate(90deg); transition: transform .2s; }
.nav-dd { position: relative; }
.mega { position: absolute; top: calc(100% + 10px); left: -20px; width: min(760px, 92vw); background: var(--card); border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow-3); padding: 12px; opacity: 0; visibility: hidden; transform: translateY(-6px); transition: .18s; }
.nav-dd.open .mega { opacity: 1; visibility: visible; transform: none; }
.nav-dd.open .dd-car { transform: rotate(-90deg); }
.mega-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 4px; }
.mm-item { display: flex; gap: 12px; padding: 12px; border-radius: 12px; color: var(--text); text-decoration: none !important; }
.mm-item:hover { background: var(--bg-2); }
.mm-item b { display: block; font-size: 14px; } .mm-item small { display: block; color: var(--text-3); font-size: 12.5px; line-height: 1.45; margin-top: 2px; }
.mm-ico, .mod-ico, .point-ico { display: inline-grid; place-items: center; width: 36px; height: 36px; border-radius: 10px; background: var(--primary-soft); color: var(--primary); flex: none; }
.mm-ico .ic { width: 18px; height: 18px; }
.hdr-act { display: flex; align-items: center; gap: 6px; margin-left: auto; }
.hdr-cta { display: inline-flex; gap: 8px; margin-left: 6px; }
.lang-dd { position: relative; }
.lang-menu { position: absolute; right: 0; top: calc(100% + 8px); background: var(--card); border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow-2); padding: 6px; min-width: 140px; display: none; }
.lang-dd.open .lang-menu { display: block; }
.lang-menu a { display: block; padding: 8px 12px; border-radius: 8px; color: var(--text); font-size: 14px; text-decoration: none !important; }
.lang-menu a:hover, .lang-menu a.on { background: var(--primary-soft); color: var(--primary); }
.burger, .nav-mobile-actions { display: none; }

/* hero */
.hero { background: var(--hero-bg); padding: 72px 0 40px; overflow: hidden; }
.hero-in { display: grid; grid-template-columns: 1fr 1.25fr; gap: 56px; align-items: center; }
.hero h1 { font-size: clamp(34px, 4.4vw, 56px); text-wrap: balance; font-weight: 800; letter-spacing: -.03em; margin-bottom: 20px; background: linear-gradient(120deg, var(--text) 30%, var(--primary) 100%); -webkit-background-clip: text; background-clip: text; color: transparent; }
[lang="th"] .hero h1 { letter-spacing: -.01em; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; margin: 28px 0 14px; }
.hero-note { display: flex; align-items: center; gap: 8px; color: var(--text-3); font-size: 14px; }
.hero-note .ic { width: 16px; height: 16px; color: var(--ok); }
.hero-badges { list-style: none; padding: 0; margin: 22px 0 0; display: flex; flex-wrap: wrap; gap: 8px; }
.hero-badges li { font-size: 13px; font-weight: 600; color: var(--text-2); border: 1px solid var(--line-2); background: var(--card); padding: 5px 12px; border-radius: 99px; }
.hero-art { position: relative; }
.hero-shot { transform: perspective(1600px) rotateY(-6deg) rotateX(2deg); transform-origin: left center; }
.float-card { position: absolute; display: flex; align-items: center; gap: 8px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow-2); padding: 10px 14px; font-weight: 700; font-size: 14px; animation: float 6s ease-in-out infinite; }
.float-card .ic { color: var(--primary); }
.fc1 { left: -24px; bottom: 34px; } .fc1 .ic { color: var(--ok); }
.fc2 { right: -10px; top: -14px; animation-delay: -3s; } .fc2 .ic { color: var(--accent); }
@keyframes float { 50% { transform: translateY(-8px); } }
@media (prefers-reduced-motion: reduce) { .float-card { animation: none; } html { scroll-behavior: auto; } }

/* browser frame + screenshot placeholder */
.browser { border-radius: 14px; background: var(--card); border: 1px solid var(--line); box-shadow: var(--shadow-3); overflow: hidden; }
.browser-bar { display: flex; align-items: center; gap: 6px; height: 32px; padding: 0 12px; background: var(--bg-2); border-bottom: 1px solid var(--line); }
.browser-bar i { width: 10px; height: 10px; border-radius: 50%; background: var(--line-2); }
.browser-bar i:nth-child(1) { background: #FF6159; } .browser-bar i:nth-child(2) { background: #FFBD2E; } .browser-bar i:nth-child(3) { background: #28C941; }
.browser-bar span { margin-left: 10px; font-size: 11.5px; color: var(--text-3); background: var(--card); border-radius: 6px; padding: 2px 10px; }
.browser img { width: 100%; }
.shot-ph { aspect-ratio: 16 / 10; display: grid; grid-template-columns: 22% 1fr 1fr 1fr; grid-template-rows: 18% 1fr 1fr; gap: 10px; padding: 14px; background: linear-gradient(180deg, var(--bg-2), var(--card)); }
.shot-ph span { grid-row: 1 / 4; border-radius: 10px; background: var(--bg-3); }
.shot-ph span + span, .shot-ph span + span + span { display: none; }
.shot-ph i { border-radius: 10px; background: var(--bg-3); }
.shot-ph i:first-of-type { grid-column: 2 / 5; background: var(--primary-soft); }

/* trust */
.trust { padding: 26px 0 34px; border-bottom: 1px solid var(--line); }
.trust p { text-align: center; color: var(--text-3); font-size: 14px; font-weight: 600; margin-bottom: 16px; }
.trust-logos { display: flex; flex-wrap: wrap; justify-content: center; gap: 22px 34px; }
.trust-logos img { width: 36px; height: 36px; object-fit: contain; filter: grayscale(1); opacity: .65; transition: .2s; border-radius: 8px; }
.trust-logos img:hover { filter: none; opacity: 1; }

/* sections */
.sec { padding: 88px 0; }
.sec.tight { padding: 40px 0 72px; }
.sec.alt { background: var(--bg-2); }
.sec-head { text-align: center; max-width: 760px; margin: 0 auto 48px; }
.sec-head.left { text-align: left; margin-left: 0; max-width: 860px; margin-bottom: 28px; }
.sec-head h2, .cta-in h2 { font-size: clamp(28px, 3.4vw, 40px); font-weight: 800; letter-spacing: -.02em; }
.sec-head p { color: var(--text-2); font-size: 17px; }
.pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.pillar { position: relative; padding: 30px; border-radius: var(--r-lg); background: var(--card); border: 1px solid var(--line); box-shadow: var(--shadow-1); }
.pillar-n { display: inline-block; font-weight: 800; font-size: 14px; color: var(--accent); background: var(--accent-soft); padding: 3px 10px; border-radius: 99px; margin-bottom: 16px; }
.pillar h3 { font-size: 21px; } .pillar p { color: var(--text-2); margin: 0; }
.mod-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.mod-card { display: flex; flex-direction: column; padding: 24px; border-radius: var(--r-lg); background: var(--card); border: 1px solid var(--line); color: var(--text); text-decoration: none !important; transition: transform .18s, box-shadow .18s, border-color .18s; }
.mod-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-2); border-color: color-mix(in srgb, var(--primary) 40%, var(--line)); }
.mod-ico { width: 44px; height: 44px; border-radius: 12px; margin-bottom: 16px; }
.mod-card h3 { font-size: 18px; } .mod-card p { color: var(--text-2); font-size: 15px; flex: 1; }
.mod-card .more { display: inline-flex; align-items: center; gap: 6px; color: var(--primary); font-weight: 700; font-size: 14px; }
.mod-card .more .ic { width: 15px; height: 15px; transition: transform .18s; } .mod-card:hover .more .ic { transform: translateX(3px); }
.show-tabs { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-bottom: 30px; }
.show-tabs button { display: inline-flex; align-items: center; gap: 8px; border: 1px solid var(--line-2); background: var(--card); color: var(--text-2); font: 600 14px var(--font); padding: 9px 16px; border-radius: 99px; cursor: pointer; }
.show-tabs button .ic { width: 16px; height: 16px; }
.show-tabs button[aria-selected="true"] { background: var(--primary); border-color: var(--primary); color: #fff; }
:root[data-theme="dark"] .show-tabs button[aria-selected="true"] { color: #0C0C18; }
.show-pane { display: none; grid-template-columns: .8fr 1.5fr; gap: 44px; align-items: center; }
.show-pane.on { display: grid; animation: fade .35s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } }
.show-copy h3 { font-size: 26px; } .show-copy p { color: var(--text-2); }
.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: s; }
.steps li { position: relative; padding: 26px; border-radius: var(--r-lg); background: var(--card); border: 1px solid var(--line); }
.step-n { display: inline-grid; place-items: center; width: 36px; height: 36px; border-radius: 50%; background: var(--grad); color: #fff; font-weight: 800; margin-bottom: 14px; }
.steps h3 { font-size: 18px; } .steps p { color: var(--text-2); font-size: 15px; margin: 0; }
.ai-band { display: grid; grid-template-columns: 1fr 1.25fr; gap: 56px; align-items: center; }
.ai-copy h2 { font-size: clamp(28px, 3.4vw, 40px); font-weight: 800; } .ai-copy p { color: var(--text-2); font-size: 17px; }
.int-strip { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; max-width: 980px; margin: 0 auto 28px; }
.int-pill { display: inline-flex; align-items: center; gap: 8px; padding: 8px 14px 8px 10px; border-radius: 99px; background: var(--card); border: 1px solid var(--line); font-weight: 600; font-size: 14px; }
.int-pill img { width: 22px; height: 22px; object-fit: contain; border-radius: 6px; }
.faq-wrap { display: grid; grid-template-columns: .8fr 1.5fr; gap: 48px; align-items: start; }
.faq { display: grid; gap: 10px; }
.faq details { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 4px 20px; transition: border-color .15s; }
.faq details[open] { border-color: color-mix(in srgb, var(--primary) 40%, var(--line)); }
.faq summary { cursor: pointer; font-weight: 700; padding: 14px 0; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-weight: 500; font-size: 22px; line-height: 1; color: var(--primary); transition: transform .2s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq p { color: var(--text-2); }
.cta-band { background: var(--grad); color: #fff; padding: 64px 0; }
.cta-in { display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.cta-in h2 { color: #fff; } .cta-in p { color: rgba(255,255,255,.82); font-size: 17px; margin: 0; }
.cta-btns { display: flex; gap: 12px; flex-wrap: wrap; }
.cta-band .btn.primary { background: #fff; color: var(--primary-ink); box-shadow: none; }
.cta-band .btn.primary:hover { background: #F1F0FF; }

/* inner pages */
.page-hero { background: var(--hero-bg); padding: 64px 0 56px; }
.page-hero.slim { padding: 60px 0 36px; }
.page-hero h1 { font-size: clamp(32px, 4.2vw, 50px); font-weight: 800; letter-spacing: -.025em; }
.page-hero.slim .center .lead { margin: 0 auto; }
.ph-in { display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; align-items: center; }
.crumb { display: block; font-size: 14px; font-weight: 600; color: var(--text-3); margin-bottom: 14px; }
.points { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.point { display: flex; gap: 16px; padding: 26px; border-radius: var(--r-lg); background: var(--card); border: 1px solid var(--line); }
.point-ico { width: 40px; height: 40px; }
.point h3 { font-size: 18px; } .point p { color: var(--text-2); margin: 0; }
.learn-chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip { display: inline-flex; align-items: center; gap: 8px; padding: 9px 16px; border-radius: 99px; background: var(--card); border: 1px solid var(--line-2); color: var(--text); font-weight: 600; font-size: 14.5px; text-decoration: none !important; }
.chip .ic { width: 16px; height: 16px; color: var(--primary); }
.chip:hover { border-color: var(--primary); color: var(--primary); }
.mini-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.mini-card { display: flex; align-items: center; gap: 10px; padding: 14px 16px; border-radius: 12px; border: 1px solid var(--line); background: var(--card); color: var(--text); font-weight: 600; font-size: 14.5px; text-decoration: none !important; }
.mini-card .ic { color: var(--primary); } .mini-card:hover { border-color: var(--primary); }
.int-cat { margin-bottom: 44px; } .int-cat h2 { font-size: 22px; margin-bottom: 16px; }
.int-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.int-card { display: flex; align-items: center; gap: 14px; padding: 16px; border-radius: 14px; background: var(--card); border: 1px solid var(--line); color: var(--text); text-decoration: none !important; transition: .15s; }
a.int-card:hover { border-color: var(--primary); box-shadow: var(--shadow-2); transform: translateY(-2px); }
.int-card img { width: 40px; height: 40px; object-fit: contain; border-radius: 10px; background: #fff; padding: 3px; border: 1px solid var(--line); }
.int-card b { display: block; font-size: 15px; } .int-card span { display: block; font-size: 13px; color: var(--primary); font-weight: 600; }
div.int-card span { color: var(--text-3); }
.cycle { display: inline-flex; gap: 4px; padding: 4px; border-radius: 99px; background: var(--card); border: 1px solid var(--line-2); margin-top: 26px; }
.cycle button { border: 0; background: none; padding: 9px 18px; border-radius: 99px; font: 600 14.5px var(--font); color: var(--text-2); cursor: pointer; }
.cycle button em { font-style: normal; font-size: 12px; color: var(--ok); background: var(--ok-soft); padding: 2px 8px; border-radius: 99px; margin-left: 4px; }
.cycle button.on { background: var(--primary); color: #fff; } .cycle button.on em { background: rgba(255,255,255,.2); color: #fff; }
:root[data-theme="dark"] .cycle button.on { color: #0C0C18; }
.plans { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 16px; align-items: stretch; }
.plan { position: relative; display: flex; flex-direction: column; padding: 26px 22px; border-radius: var(--r-lg); background: var(--card); border: 1px solid var(--line); }
.plan.pop { border: 2px solid var(--primary); box-shadow: var(--shadow-3); }
.plan-badge { position: absolute; top: -12px; left: 22px; background: var(--grad); color: #fff; font-size: 12px; font-weight: 700; padding: 4px 12px; border-radius: 99px; }
.plan h3 { font-size: 20px; margin-bottom: 4px; } .plan-blurb { color: var(--text-3); font-size: 14px; min-height: 44px; }
.price { margin: 6px 0 18px; display: flex; align-items: baseline; gap: 6px; flex-wrap: wrap; min-height: 48px; }
.price[hidden] { display: none; }
.price b { font-size: 34px; font-weight: 800; letter-spacing: -.02em; } .price span { color: var(--text-3); font-size: 13.5px; }
.plan .btn { margin-bottom: 18px; } .plan .ticks { font-size: 14px; gap: 8px; } .plan .ticks .ic { width: 16px; height: 16px; }
.packs { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; }
.pack { display: flex; justify-content: space-between; align-items: center; padding: 18px 20px; border-radius: 14px; background: var(--card); border: 1px solid var(--line); }
.pack b { font-size: 17px; } .pack span { font-weight: 700; color: var(--primary); }
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; border-radius: 14px; border: 1px solid var(--line); background: var(--card); }
table { border-collapse: collapse; width: 100%; font-size: 14.5px; }
th, td { padding: 11px 14px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.cmp th, .cmp td { text-align: center; white-space: nowrap; } .cmp th[scope="row"] { text-align: left; font-weight: 500; color: var(--text-2); white-space: normal; min-width: 200px; }
.cmp thead th { position: sticky; top: 0; background: var(--bg-2); font-size: 15px; }
.cmp tr.grp th { text-align: left; background: var(--bg-2); font-size: 13px; text-transform: uppercase; letter-spacing: .04em; color: var(--text-3); }
.cmp .yes .ic { width: 18px; height: 18px; color: var(--ok); margin: 0 auto; } .cmp .no { color: var(--text-3); }
.doc-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-bottom: 22px; }
.doc-card { display: flex; align-items: center; gap: 12px; padding: 18px; border-radius: 14px; background: var(--card); border: 1px solid var(--line); color: var(--text); text-decoration: none !important; }
.doc-card b { flex: 1; } .doc-card .ic { color: var(--primary); } .doc-card:hover { border-color: var(--primary); }
.ccards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.ccard { padding: 28px; border-radius: var(--r-lg); background: var(--card); border: 1px solid var(--line); display: flex; flex-direction: column; align-items: flex-start; }
.ccard .point-ico { margin-bottom: 14px; } .ccard p { color: var(--text-2); flex: 1; }
.addr { margin-top: 28px; display: flex; flex-wrap: wrap; gap: 8px 24px; color: var(--text-2); font-size: 14.5px; }
.narrow { max-width: 860px; }

/* footer */
.ftr { border-top: 1px solid var(--line); padding: 56px 0 28px; background: var(--bg); }
.ftr-grid { display: grid; grid-template-columns: 1.6fr repeat(4, 1fr); gap: 28px; }
.ftr h4 { font-size: 13px; text-transform: uppercase; letter-spacing: .06em; color: var(--text-3); margin-bottom: 12px; }
.ftr-grid > div > a:not(.logo) { display: block; color: var(--text-2); font-size: 14.5px; padding: 4px 0; }
.ftr-brand p { color: var(--text-3); font-size: 14.5px; margin: 12px 0; max-width: 300px; }
.ftr-lang { display: flex; gap: 6px; } .ftr-lang a { font-size: 13px; padding: 4px 10px; border: 1px solid var(--line); border-radius: 99px; color: var(--text-2); }
.ftr-lang a.on { border-color: var(--primary); color: var(--primary); }
.ftr-bot { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; border-top: 1px solid var(--line); margin-top: 36px; padding-top: 20px; color: var(--text-3); font-size: 13.5px; }

/* ------------------------------------------------ learning center */
body.learn .ftr { padding-top: 36px; }
.lc { display: grid; grid-template-columns: 280px minmax(0, 1fr) 220px; gap: 40px; max-width: 1400px; margin: 0 auto; padding: 28px 24px 64px; align-items: start; }
.lc:not(:has(.lc-otp)) { grid-template-columns: 280px minmax(0, 1fr); }
.lc-side { position: sticky; top: 84px; max-height: calc(100vh - 100px); overflow-y: auto; padding-right: 6px; scrollbar-width: thin; }
.embed .lc-side { top: 52px; max-height: calc(100vh - 60px); }
.lc-search { position: relative; display: flex; align-items: center; gap: 8px; border: 1px solid var(--line-2); border-radius: 12px; padding: 0 12px; background: var(--card); margin-bottom: 16px; }
.lc-search:focus-within { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
.lc-search .ic { width: 17px; height: 17px; color: var(--text-3); }
.lc-search input { border: 0; outline: 0; background: transparent; height: 42px; width: 100%; font: 15px var(--font); color: var(--text); }
.lc-results { position: absolute; left: 0; right: 0; top: calc(100% + 6px); background: var(--card); border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow-3); z-index: 30; max-height: 60vh; overflow-y: auto; padding: 6px; min-width: 300px; }
.lc-r { display: block; padding: 10px 12px; border-radius: 10px; color: var(--text); text-decoration: none !important; }
.lc-r:hover, .lc-r.on { background: var(--primary-soft); }
.lc-r b { display: block; font-size: 14px; } .lc-r span { display: block; font-size: 12.5px; color: var(--primary); } .lc-r small { display: block; font-size: 12.5px; color: var(--text-3); line-height: 1.45; }
.lc-r-all { display: block; text-align: right; padding: 6px 12px; font-weight: 700; }
.lc-r-empty { padding: 12px; color: var(--text-3); font-size: 14px; }
.lc-sec { margin-bottom: 4px; }
.lc-sec summary { display: flex; align-items: center; gap: 8px; cursor: pointer; list-style: none; padding: 8px 8px; border-radius: 8px; font-weight: 700; font-size: 14px; color: var(--text); }
.lc-sec summary::-webkit-details-marker { display: none; }
.lc-sec summary .ic { width: 17px; height: 17px; color: var(--primary); }
.lc-sec summary::after { content: ""; margin-left: auto; width: 7px; height: 7px; border-right: 2px solid var(--text-3); border-bottom: 2px solid var(--text-3); transform: rotate(-45deg); transition: transform .2s; }
.lc-sec[open] summary::after { transform: rotate(45deg); }
.lc-sec summary:hover { background: var(--bg-2); }
.lc-sec ul { list-style: none; margin: 2px 0 10px; padding: 0 0 0 16px; border-left: 1px solid var(--line); margin-left: 16px; }
.lc-sec li a { display: block; padding: 6px 10px; border-radius: 8px; font-size: 14px; color: var(--text-2); text-decoration: none !important; line-height: 1.4; }
.lc-sec li a:hover { color: var(--text); background: var(--bg-2); }
.lc-sec li a.on { color: var(--primary); background: var(--primary-soft); font-weight: 700; }
.lc-hero { padding: 18px 0 26px; } .lc-hero h1 { font-size: clamp(30px, 3.6vw, 42px); font-weight: 800; }
.lc-cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.lc-card { padding: 22px; border-radius: 16px; border: 1px solid var(--line); background: var(--card); }
.lc-card h2 { display: flex; align-items: center; gap: 10px; font-size: 18px; margin-bottom: 2px; } .lc-card h2 .ic { color: var(--primary); }
.lc-n { font-size: 13px; color: var(--text-3); }
.lc-card ul { list-style: none; padding: 0; margin: 12px 0 0; display: grid; gap: 2px; }
.lc-card li a { display: block; padding: 5px 0; font-size: 14.5px; }
.lc-hits { margin-bottom: 28px; display: grid; gap: 10px; } .lc-hits h2 { font-size: 18px; }
.lc-hit { display: block; padding: 14px 16px; border: 1px solid var(--line); border-radius: 12px; background: var(--card); color: var(--text); text-decoration: none !important; }
.lc-hit:hover { border-color: var(--primary); } .lc-hit b { display: block; } .lc-hit span { display: block; color: var(--primary); font-size: 13.5px; } .lc-hit small { color: var(--text-3); }
.lc-art { max-width: 820px; }
.lc-crumb { font-size: 13.5px; color: var(--text-3); margin-bottom: 10px; } .lc-crumb a { color: var(--text-3); }
.lc-art > h1 { font-size: clamp(28px, 3.2vw, 38px); font-weight: 800; letter-spacing: -.02em; }
.lc-meta { display: flex; gap: 10px; color: var(--text-3); font-size: 13.5px; margin-bottom: 26px; }
.lc-tr { background: var(--warn-soft); color: var(--warn); padding: 0 8px; border-radius: 6px; }
.md { font-size: 16px; line-height: 1.75; }
.md h2 { font-size: 23px; margin: 2em 0 .6em; padding-top: .2em; position: relative; }
.md h3 { font-size: 18.5px; margin: 1.6em 0 .5em; }
.md .anchor { opacity: 0; margin-left: 8px; color: var(--text-3); font-weight: 400; text-decoration: none; }
.md h2:hover .anchor, .md h3:hover .anchor { opacity: 1; }
.md p, .md li { color: var(--text-2); } .md strong { color: var(--text); }
.md ul, .md ol { padding-left: 1.4em; margin: 0 0 1.2em; } .md li { margin: .3em 0; }
.md ol { counter-reset: li; list-style: none; padding-left: 0; }
.md ol > li { counter-increment: li; position: relative; padding-left: 38px; margin: .6em 0; }
.md ol > li::before { content: counter(li); position: absolute; left: 0; top: 1px; width: 26px; height: 26px; border-radius: 50%; background: var(--primary-soft); color: var(--primary); font-weight: 800; font-size: 13px; display: grid; place-items: center; }
.md code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .88em; background: var(--bg-3); padding: 2px 6px; border-radius: 6px; color: var(--text); word-break: break-word; }
.md pre { background: var(--bg-2); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; overflow-x: auto; } .md pre code { background: none; padding: 0; }
.md .table-wrap { margin: 1em 0 1.4em; } .md table { font-size: 14.5px; } .md th { background: var(--bg-2); font-weight: 700; }
.md tr:last-child td { border-bottom: 0; }
.callout { margin: 1.2em 0; padding: 14px 18px; border-radius: 12px; border: 1px solid var(--line); border-left: 4px solid var(--info); background: var(--info-soft); }
.callout.tip { border-left-color: var(--ok); background: var(--ok-soft); } .callout.warn { border-left-color: var(--warn); background: var(--warn-soft); }
.callout p:last-child, .callout ul:last-child { margin-bottom: 0; } .callout p { color: var(--text); }
.shot { margin: 1.4em 0 1.8em; }
.shot-frame { position: relative; display: block; border-radius: 12px; overflow: hidden; border: 1px solid var(--line); box-shadow: var(--shadow-2); background: var(--bg-2); }
.shot-frame img { width: 100%; }
.pin { position: absolute; transform: translate(-50%, -50%); width: 28px; height: 28px; border-radius: 50%; background: var(--accent); color: #fff; font: 800 13.5px/28px var(--font); text-align: center; box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 30%, transparent), 0 4px 12px rgba(0,0,0,.25); }
.shot figcaption { font-size: 13.5px; color: var(--text-3); text-align: center; margin-top: 8px; }
.lc-help { display: flex; align-items: center; justify-content: space-between; gap: 18px; margin: 48px 0 24px; padding: 20px 22px; border-radius: 16px; background: var(--bg-2); border: 1px solid var(--line); }
.lc-help p { margin: 2px 0 0; color: var(--text-2); font-size: 14.5px; }
.lc-pn { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.lc-pn a { display: block; padding: 14px 18px; border: 1px solid var(--line); border-radius: 14px; color: var(--text); text-decoration: none !important; }
.lc-pn a:hover { border-color: var(--primary); } .lc-pn .next { text-align: right; }
.lc-pn small { display: block; color: var(--text-3); font-size: 12.5px; } .lc-pn b { font-size: 15px; }
.lc-otp { position: sticky; top: 92px; font-size: 13.5px; border-left: 1px solid var(--line); padding-left: 16px; }
.lc-otp b { display: block; font-size: 12.5px; text-transform: uppercase; letter-spacing: .05em; color: var(--text-3); margin-bottom: 8px; }
.lc-otp ul { list-style: none; padding: 0; margin: 0; } .lc-otp a { display: block; padding: 4px 0; color: var(--text-2); line-height: 1.4; } .lc-otp a.on { color: var(--primary); font-weight: 700; }
.lc-toc-btn { display: none; }
.lc-embed-bar { position: sticky; top: 0; z-index: 40; display: flex; align-items: center; gap: 8px; height: 46px; padding: 0 12px; background: color-mix(in srgb, var(--bg) 90%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.lc-home { display: inline-flex; align-items: center; gap: 6px; font-weight: 700; color: var(--text); font-size: 14.5px; } .lc-home .ic { color: var(--primary); width: 18px; height: 18px; }
.lc-langs { display: inline-flex; gap: 2px; } .lc-langs a { font-size: 12.5px; padding: 3px 8px; border-radius: 6px; color: var(--text-3); } .lc-langs a.on { background: var(--primary-soft); color: var(--primary); }
.lc-burger { display: none; }
.embed .lc { padding: 18px 18px 40px; gap: 28px; grid-template-columns: 240px minmax(0, 1fr); }
.embed .lc-otp { display: none; }
.embed .lc-hero { display: none; } /* the app window header already shows 教学中心 + subtitle */
.lightbox { position: fixed; inset: 0; z-index: 200; background: rgba(8,8,20,.86); display: grid; place-items: center; padding: 24px; cursor: zoom-out; }
.lightbox > * { max-width: min(1400px, 96vw); max-height: 92vh; width: auto; }
.lightbox img { max-height: 90vh; width: auto; margin: 0 auto; border-radius: 10px; }

/* ------------------------------------------------ responsive */
@media (max-width: 1180px) {
  .lc { grid-template-columns: 260px minmax(0, 1fr); } .lc-otp { display: none; }
  .hdr-cta .ghost { display: none; }
}
@media (max-width: 1024px) {
  .hero-in, .ph-in, .ai-band, .show-pane.on, .faq-wrap { grid-template-columns: 1fr; gap: 36px; }
  .hero { padding-top: 48px; } .hero-shot { transform: none; }
  .mod-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .int-grid, .mini-grid, .doc-grid { grid-template-columns: repeat(3, 1fr); }
  .ftr-grid { grid-template-columns: 1fr 1fr 1fr; } .ftr-brand { grid-column: 1 / -1; }
  .nav { display: none; position: fixed; top: 68px; left: 0; right: 0; bottom: 0; background: var(--bg); flex-direction: column; align-items: stretch; padding: 16px 20px 32px; overflow-y: auto; gap: 2px; border-top: 1px solid var(--line); }
  body.nav-open .nav { display: flex; } body.nav-open { overflow: hidden; }
  .nav > a, .nav-dd-btn { font-size: 17px; padding: 12px; width: 100%; justify-content: space-between; }
  .mega { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; border: 0; padding: 0 0 8px; width: auto; display: none; }
  .nav-dd.open .mega { display: block; } .mega-grid { grid-template-columns: 1fr; }
  .burger { display: inline-flex; } .hdr-cta { display: none; }
  .nav-mobile-actions { display: flex; gap: 10px; margin-top: 18px; } .nav-mobile-actions .btn { flex: 1; height: 46px; }
  .lang-cur { display: none; }
  .ccards { grid-template-columns: 1fr; }
}
@media (max-width: 900px) {
  .lc, .embed .lc { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  .lc-side { position: static; max-height: none; overflow: visible; }
  body:not(.embed) .lc-side .lc-toc { display: none; } body:not(.embed) .lc-side.show .lc-toc { display: block; }
  .lc-toc-btn { display: inline-flex; width: 100%; }
  .embed .lc-side { display: none; } .embed.lc-side-open .lc-side { display: block; position: static; }
  .lc-burger { display: inline-flex; }
  .lc-cards { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .wrap { padding: 0 16px; }
  .sec { padding: 60px 0; } .sec-head { margin-bottom: 32px; }
  .lead { font-size: 17px; }
  .pillars, .mod-grid, .steps, .points { grid-template-columns: 1fr; }
  .int-grid, .mini-grid, .doc-grid { grid-template-columns: 1fr 1fr; }
  .float-card { display: none; }
  .hero-cta .btn { flex: 1; }
  .cta-btns { width: 100%; } .cta-btns .btn { flex: 1; }
  .ftr-grid { grid-template-columns: 1fr 1fr; }
  .lc { padding: 16px 16px 48px; }
  .lc-help { flex-direction: column; align-items: flex-start; }
  .lc-pn { grid-template-columns: 1fr; }
  .lc-results { min-width: 0; }
  .show-tabs { justify-content: flex-start; flex-wrap: nowrap; overflow-x: auto; padding-bottom: 6px; scrollbar-width: none; }
  .show-tabs button { flex: none; }
  .md ol > li { padding-left: 34px; }
  .pin { width: 22px; height: 22px; font-size: 11.5px; line-height: 22px; }
}
@media (max-width: 420px) {
  .int-grid, .mini-grid, .doc-grid { grid-template-columns: 1fr; }
  .logo-txt small { font-size: 9.5px; }
}
@media print { .hdr, .ftr, .lc-side, .lc-otp, .lc-help, .lc-pn, .cta-band, .lc-embed-bar { display: none !important; } .lc { display: block; } }

/* ================================================================ v2: editorial rhythm, methodology, focused lenses */
:root { --ink-band: #0B1030; --ink-band-2: #141A45; --ease: cubic-bezier(.2,.8,.2,1); --spring: cubic-bezier(.34,1.36,.64,1);
  --shadow-lens: 0 1px 2px rgba(22,22,58,.06), 0 24px 60px -28px rgba(30,27,95,.45), 0 0 0 1px rgba(79,70,229,.08); }
:root[data-theme="dark"] { --ink-band: #080B22; --ink-band-2: #10153A; --shadow-lens: 0 30px 70px -30px rgba(0,0,0,.85), 0 0 0 1px rgba(139,133,255,.18); }
.logo-txt { display: flex; flex-direction: column; line-height: 1.05; }
.logo-txt b { font-size: 20px; font-weight: 800; letter-spacing: -.02em; }
.logo-txt small { font-size: 10.5px; font-weight: 600; color: var(--text-3); letter-spacing: .04em; margin-top: 2px; }
.kicker { display: inline-block; font-size: 12.5px; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; color: var(--accent); margin-bottom: 14px; }
[lang="th"] .kicker, [lang="zh-CN"] .kicker { letter-spacing: .08em; }
.sec-head.left h2, .page-hero h1 { letter-spacing: -.03em; }
.sec-head.left { max-width: 900px; margin-bottom: 40px; }
.sec-head h2 { font-size: clamp(30px, 3.8vw, 46px); line-height: 1.12; }
.page-hero { padding: 72px 0 56px; }
.page-hero .lead { max-width: 760px; }
.sec.dark { background: radial-gradient(900px 500px at 90% 0%, #2A2470 0%, transparent 60%), var(--ink-band); color: #E8E9FF; }
.sec.dark h2 { color: #fff; } .sec.dark .lead, .sec.dark p { color: #B9BCE6; } .sec.dark .kicker { color: #FFB27A; }
/* reveal on scroll */
.js [data-reveal] { opacity: 0; transform: translateY(18px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.js [data-reveal].in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .js [data-reveal] { opacity: 1; transform: none; transition: none; } }
/* mega menu by group */
.mega { width: min(1040px, 94vw); left: -120px; padding: 18px; }
.mega-grid { grid-template-columns: repeat(3, 1fr); gap: 6px 18px; }
.mm-col h5 { margin: 6px 12px 4px; font-size: 11.5px; letter-spacing: .1em; text-transform: uppercase; color: var(--text-3); }
.mm-item { padding: 9px 12px; }
.mega-all { display: block; margin-top: 10px; padding: 12px; border-top: 1px solid var(--line); font-weight: 700; font-size: 14px; }
/* hero v2 */
.hero h1 { font-size: clamp(36px, 4.6vw, 62px); line-height: 1.06; }
.hero-pills { list-style: none; display: flex; flex-wrap: wrap; gap: 10px; padding: 0; margin: 44px 0 0; }
.hero-pills li { font-size: 13.5px; font-weight: 700; color: var(--primary-ink); background: var(--primary-soft); padding: 7px 14px; border-radius: 99px; }
:root[data-theme="dark"] .hero-pills li { color: var(--primary-ink); }
/* layers */
.layers { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--line); border-radius: var(--r-lg); overflow: hidden; background: var(--card); }
.layer { position: relative; padding: 34px 30px 30px; border-right: 1px solid var(--line); }
.layer:last-child { border-right: 0; background: linear-gradient(180deg, var(--primary-soft), transparent 70%); }
.layer-n, .cell-n { display: block; font-size: 13px; font-weight: 800; color: var(--accent); margin-bottom: 18px; letter-spacing: .06em; }
.layer h3 { font-size: 22px; } .layer p { color: var(--text-2); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; } .chips span { font-size: 12.5px; font-weight: 600; border: 1px solid var(--line-2); border-radius: 99px; padding: 3px 10px; color: var(--text-2); }
.layer::before { content: ""; position: absolute; left: 30px; right: 30px; top: 0; height: 3px; border-radius: 0 0 3px 3px; background: var(--grad); opacity: .0; transition: opacity .3s; }
.layer:hover::before { opacity: 1; }
/* loop */
.loop { list-style: none; padding: 0; margin: 0 0 36px; display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; position: relative; counter-reset: s; }
.loop-step { position: relative; padding: 26px 22px 24px; background: var(--card); border: 1px solid var(--line); margin-left: -1px; transition: transform .25s var(--spring), box-shadow .25s; }
.loop-step:first-child { border-radius: var(--r-lg) 0 0 var(--r-lg); margin-left: 0; } .loop-step:nth-child(5) { border-radius: 0 var(--r-lg) var(--r-lg) 0; }
.loop-step:hover { transform: translateY(-4px); box-shadow: var(--shadow-2); z-index: 2; }
.loop-step:not(:nth-child(5))::after { content: ""; position: absolute; right: -9px; top: 38px; width: 16px; height: 16px; background: var(--card); border-top: 1px solid var(--line); border-right: 1px solid var(--line); transform: rotate(45deg); z-index: 3; }
.loop-ico { display: inline-grid; place-items: center; width: 42px; height: 42px; border-radius: 12px; background: var(--grad); color: #fff; margin-bottom: 14px; box-shadow: 0 8px 18px -8px rgba(79,70,229,.7); }
.loop-n { float: right; font-weight: 800; color: var(--text-3); font-size: 13px; }
.loop-step b { display: block; font-size: 19px; margin-bottom: 6px; } .loop-step p { color: var(--text-2); font-size: 14.5px; margin-bottom: 10px; }
.loop-step small { display: block; font-size: 12.5px; font-weight: 700; color: var(--primary); }
.loop-back { position: absolute; left: 50%; bottom: -30px; transform: translateX(-50%); color: var(--accent); background: var(--bg-2); padding: 4px 10px; border-radius: 99px; }
.loop-back .ic { width: 22px; height: 22px; }
/* data band + hub */
.data-band { display: grid; grid-template-columns: 1fr 1.05fr; gap: 56px; align-items: center; }
.data-pts { list-style: none; padding: 0; margin: 26px 0 30px; display: grid; gap: 14px; }
.data-pts li { display: flex; gap: 12px; } .data-pts .ic { color: #7CF0C2; margin-top: 3px; width: 18px; height: 18px; }
.data-pts b { color: #fff; } .data-pts p { margin: 2px 0 0; font-size: 14.5px; }
.sec.dark .btn.primary { background: #fff; color: #1E1B4B; }
.hub { position: relative; display: grid; grid-template-columns: 70px 1fr 150px; grid-template-rows: auto auto; gap: 0 0; align-items: center; padding: 26px; border-radius: 22px; background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.1); margin-bottom: 22px; }
.sec:not(.dark) .hub { background: var(--card); border-color: var(--line); }
.hub-srcs { display: grid; gap: 8px; }
.hub-src { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 12px; background: #fff; box-shadow: 0 6px 16px -8px rgba(0,0,0,.5); animation: pulse 3.2s ease-in-out infinite; animation-delay: calc(var(--i) * .3s); }
.hub-src:nth-child(n+6) { display: none; }
.hub-src img { width: 26px; height: 26px; object-fit: contain; }
@keyframes pulse { 50% { transform: translateX(4px); } }
.hub-lines { width: 100%; height: 260px; }
.hub-lines path { fill: none; stroke: url(#g); stroke: #8B85FF; stroke-width: .6; stroke-dasharray: 3 3; animation: dash 2.4s linear infinite; vector-effect: non-scaling-stroke; opacity: .8; }
@keyframes dash { to { stroke-dashoffset: -12; } }
.hub-core { display: grid; justify-items: center; gap: 4px; text-align: center; padding: 18px 10px; border-radius: 18px; background: linear-gradient(160deg, #4F46E5, #7C3AED); color: #fff; box-shadow: 0 20px 50px -20px rgba(124,58,237,.9); }
.hub-core b { font-size: 15px; } .hub-core small { font-size: 11.5px; opacity: .85; }
.ladder { grid-column: 1 / -1; margin-top: 20px; }
.ladder h5 { margin: 0 0 10px; font-size: 12px; letter-spacing: .1em; text-transform: uppercase; opacity: .7; }
.ladder ol { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; }
.ladder li { width: var(--w); display: flex; align-items: center; gap: 10px; padding: 8px 12px; border-radius: 10px; background: linear-gradient(90deg, rgba(139,133,255,.35), rgba(139,133,255,.08)); font-size: 13.5px; font-weight: 600; color: inherit; }
.sec:not(.dark) .ladder li { background: linear-gradient(90deg, var(--primary-soft), transparent); }
.ladder li span { display: inline-grid; place-items: center; width: 22px; height: 22px; border-radius: 6px; background: rgba(255,255,255,.18); font-size: 12px; }
/* feature groups */
.grps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.grp { padding: 26px 24px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.grp h3 { font-size: 13px; letter-spacing: .1em; text-transform: uppercase; color: var(--text-3); margin-bottom: 12px; }
.grp ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 2px; }
.grp a { display: flex; gap: 12px; padding: 9px 8px; border-radius: 12px; color: var(--text); text-decoration: none !important; transition: background .15s; }
.grp a:hover { background: var(--bg-2); } .grp b { display: block; font-size: 15px; } .grp small { display: block; color: var(--text-3); font-size: 13px; line-height: 1.45; }
/* numbered hairline cells */
.cells { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.cells.three { grid-template-columns: repeat(3, 1fr); }
.cell { padding: 30px 28px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--card); transition: background .2s; }
.cell:hover { background: var(--bg-2); }
.cell h3 { font-size: 18.5px; } .cell p { color: var(--text-2); margin: 0; font-size: 15px; }
/* lens = focused crop */
.lens { margin: 0; }
.lens-frame { position: relative; border-radius: 18px; padding: 10px; background: linear-gradient(140deg, rgba(99,102,241,.16), rgba(249,115,22,.10)); box-shadow: var(--shadow-lens); }
.lens-frame img { border-radius: 11px; width: 100%; background: var(--card); box-shadow: 0 1px 3px rgba(0,0,0,.08); }
.lens.on-dark .lens-frame { background: linear-gradient(140deg, rgba(139,133,255,.25), rgba(251,146,60,.18)); }
.lens figcaption { display: flex; align-items: center; gap: 8px; margin-top: 12px; font-size: 13.5px; color: var(--text-3); }
.sec.dark .lens figcaption { color: #9EA2D8; }
.lens figcaption .ic { width: 15px; height: 15px; color: var(--accent); }
.hero-lens .lens-frame { transform: perspective(1600px) rotateY(-4deg); transition: transform .6s var(--ease); } .hero-lens:hover .lens-frame { transform: none; }
.pairs { display: grid; gap: 64px; margin-top: 72px; }
.pair { display: grid; grid-template-columns: 1.25fr 1fr; gap: 48px; align-items: center; }
.pair.rev { grid-template-columns: 1fr 1.25fr; } .pair.rev .lens { order: 2; }
.pair h3 { font-size: 24px; } .pair p { color: var(--text-2); }
/* flow, metrics, links */
.flow { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 16px; counter-reset: f; }
.flow li { position: relative; padding: 22px; border-radius: 16px; background: var(--card); border: 1px solid var(--line); }
.flow-n { display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: var(--primary); color: #fff; font-weight: 800; font-size: 14px; margin-bottom: 12px; }
:root[data-theme="dark"] .flow-n { color: #0C0C18; }
.flow b { display: block; margin-bottom: 4px; } .flow p { color: var(--text-2); font-size: 14.5px; margin: 0; }
.metrics { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0; margin: 0; border-top: 1px solid var(--line); }
.metrics > div { display: grid; grid-template-columns: 220px 1fr; gap: 16px; padding: 16px 4px; border-bottom: 1px solid var(--line); }
.metrics > div:nth-child(odd) { padding-right: 28px; } .metrics > div:nth-child(even) { padding-left: 28px; border-left: 1px solid var(--line); }
.metrics dt { font-weight: 700; } .metrics dd { margin: 0; color: var(--text-2); font-size: 14.5px; }
.link-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.link-card { display: flex; align-items: flex-start; gap: 14px; padding: 18px 20px; border-radius: 16px; background: var(--card); border: 1px solid var(--line); color: var(--text); text-decoration: none !important; transition: border-color .15s, transform .2s var(--spring), box-shadow .2s; }
.link-card:hover { border-color: var(--primary); transform: translateY(-2px); box-shadow: var(--shadow-2); }
.link-card b { display: block; } .link-card small { display: block; color: var(--text-2); font-size: 14px; line-height: 1.5; margin-top: 2px; }
.link-card > .ic:last-child { margin-left: auto; color: var(--primary); width: 18px; height: 18px; margin-top: 3px; flex: none; }
.crumbs { display: flex; flex-wrap: wrap; gap: 8px; font-size: 13.5px; color: var(--text-3); margin-bottom: 18px; } .crumbs a { color: var(--text-3); }
.feat-hero .ph-in { grid-template-columns: 1fr 1.15fr; }
/* features index */
.fi-grp { margin-bottom: 56px; } .fi-grp h2 { font-size: 24px; margin-bottom: 18px; }
.fi-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.fi-card { display: flex; flex-direction: column; border-radius: 18px; overflow: hidden; background: var(--card); border: 1px solid var(--line); color: var(--text); text-decoration: none !important; transition: transform .25s var(--spring), box-shadow .25s, border-color .2s; }
.fi-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-3); border-color: color-mix(in srgb, var(--primary) 40%, var(--line)); }
.fi-img { display: block; aspect-ratio: 16 / 9; overflow: hidden; background: linear-gradient(140deg, rgba(99,102,241,.14), rgba(249,115,22,.08)); padding: 12px 12px 0; }
.fi-img img { width: 100%; height: 100%; object-fit: cover; object-position: top left; border-radius: 8px 8px 0 0; box-shadow: 0 1px 3px rgba(0,0,0,.08); transition: transform .5s var(--ease); }
.fi-card:hover .fi-img img { transform: scale(1.03); }
.fi-body { display: grid; gap: 4px; padding: 18px 20px 20px; } .fi-body .mm-ico { margin-bottom: 8px; } .fi-body b { font-size: 16.5px; } .fi-body small { color: var(--text-2); font-size: 14px; line-height: 1.5; }
.fi-kids { margin-top: 6px; font-size: 12.5px; font-weight: 600; color: var(--primary); }
/* methodology */
.stages { display: grid; gap: 16px; margin-top: 56px; }
.stage { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 0 28px; padding: 26px 28px; border-radius: 18px; background: var(--card); border: 1px solid var(--line); }
.stage-h { display: grid; grid-template-columns: auto 1fr; column-gap: 14px; align-items: center; }
.stage-h .loop-ico { grid-row: 1 / 3; margin: 0; } .stage-h .loop-n { display: none; } .stage-h h3 { margin: 0; font-size: 21px; } .stage-h p { margin: 0; color: var(--text-2); font-size: 14.5px; }
.stage-c h5 { margin: 0 0 10px; font-size: 12px; letter-spacing: .1em; text-transform: uppercase; color: var(--text-3); }
.stage-c .ticks { font-size: 14.5px; gap: 6px; margin: 0; }
.watch { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 6px; } .watch li { font-size: 13px; font-weight: 600; padding: 4px 10px; border-radius: 8px; background: var(--accent-soft); color: var(--accent); }
.stage-f { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; padding-top: 16px; border-top: 1px dashed var(--line-2); }
.tag-link { display: inline-flex; align-items: center; gap: 6px; padding: 6px 12px; border-radius: 99px; border: 1px solid var(--line-2); font-size: 13.5px; font-weight: 600; color: var(--text); text-decoration: none !important; }
.tag-link .ic { width: 15px; height: 15px; color: var(--primary); } .tag-link:hover { border-color: var(--primary); color: var(--primary); }
.cadence { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border-left: 2px solid var(--primary-soft); }
.cadence li { position: relative; padding: 4px 24px 4px 26px; }
.cadence li::before { content: ""; position: absolute; left: -7px; top: 8px; width: 12px; height: 12px; border-radius: 50%; background: var(--primary); box-shadow: 0 0 0 4px var(--primary-soft); }
.cadence b { font-size: 18px; } .cadence p { color: var(--text-2); font-size: 14.5px; margin-top: 6px; }
.about-group { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 26px; padding: 16px 18px; border-radius: 14px; background: var(--bg-2); border: 1px solid var(--line); font-size: 14.5px; color: var(--text-2); }
.about-group .ic { color: var(--primary); } .about-group a { font-weight: 700; }
.ftr-by { font-size: 13px !important; } .ext { font-size: 11px; opacity: .7; }
.ftr-grid { grid-template-columns: 1.5fr repeat(5, 1fr); }
@media (max-width: 1180px) { .loop { grid-template-columns: repeat(3, 1fr); gap: 12px; } .loop-step, .loop-step:first-child, .loop-step:nth-child(5) { border-radius: 16px; margin: 0; } .loop-step::after { display: none; } .loop-back { display: none; } .stage { grid-template-columns: 1fr 1fr; } .stage-h { grid-column: 1 / -1; margin-bottom: 16px; } }
@media (max-width: 1024px) {
  .layers, .grps { grid-template-columns: 1fr; } .layer { border-right: 0; border-bottom: 1px solid var(--line); }
  .grps { grid-template-columns: repeat(2, 1fr); }
  .cells, .cells.three, .fi-grid { grid-template-columns: repeat(2, 1fr); }
  .data-band, .pair, .pair.rev, .feat-hero .ph-in { grid-template-columns: 1fr; } .pair.rev .lens { order: 0; }
  .cadence { grid-template-columns: repeat(2, 1fr); row-gap: 24px; }
  .metrics { grid-template-columns: 1fr; } .metrics > div:nth-child(n) { padding: 14px 4px; border-left: 0; }
  .mega { width: auto; left: 0; } .mega-grid { grid-template-columns: 1fr; }
  .ftr-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 720px) {
  .loop, .cells, .cells.three, .fi-grid, .grps, .link-grid, .cadence { grid-template-columns: 1fr; }
  .stage { grid-template-columns: 1fr; gap: 16px; padding: 22px; }
  .metrics > div { grid-template-columns: 1fr; gap: 4px; }
  .hub { grid-template-columns: 54px 1fr 112px; padding: 16px; } .hub-src { width: 38px; height: 38px; } .hub-lines { height: 220px; }
  .cell { padding: 24px 20px; }
  .ftr-grid { grid-template-columns: 1fr 1fr; }
  .hero-pills { margin-top: 28px; }
}

.data-band h2 { font-size: clamp(28px, 3.3vw, 42px); line-height: 1.15; letter-spacing: -.02em; }
.grps { display: block; columns: 3; column-gap: 18px; border: 0; }
.grp { break-inside: avoid; margin: 0 0 18px; border: 1px solid var(--line); border-radius: 18px; background: var(--card); }
.cells.two { grid-template-columns: repeat(2, 1fr); } .cells.four { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 1024px) { .grps { columns: 2; } .cells.four { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 720px) { .grps { columns: 1; } .cells.two, .cells.four { grid-template-columns: 1fr; } }
.lens.nocap figcaption { display: none; }
.ai-found { padding: 0 0 8px; }
.ai-found-in { display: grid; grid-template-columns: 1fr 1.1fr; gap: 36px; align-items: center; padding: 30px 32px; border-radius: 22px; background: radial-gradient(700px 300px at 100% 0%, #2A2470 0%, transparent 65%), var(--ink-band); color: #E8E9FF; box-shadow: var(--shadow-lens); }
.ai-found-in h2 { color: #fff; font-size: clamp(22px, 2.4vw, 30px); } .ai-found-in p { color: #B9BCE6; margin: 0; } .ai-found-in a { color: #FFB27A; font-weight: 700; } .ai-found .kicker { color: #FFB27A; }
.ai-logos { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.ai-logos li { display: flex; align-items: center; gap: 12px; padding: 14px 16px; border-radius: 14px; background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.12); font-weight: 700; color: #fff; }
.ai-logos img { width: 34px; height: 34px; object-fit: contain; border-radius: 9px; background: #fff; padding: 3px; }
@media (max-width: 1024px) { .ai-found-in { grid-template-columns: 1fr; } }
@media (max-width: 420px) { .ai-logos { grid-template-columns: 1fr; } }