/* =========================================================
   New API · Promo Landing — Design System
   Light / Dark dual theme via CSS variables + [data-theme]
   ========================================================= */

/* ---------- Tokens ---------- */
:root {
  --brand-1: #7c5cff;
  --brand-2: #18c8ff;
  --brand-3: #ff6ec7;
  --brand-grad: linear-gradient(120deg, var(--brand-1), var(--brand-2));
  --brand-grad-soft: linear-gradient(120deg, rgba(124, 92, 255, .18), rgba(24, 200, 255, .18));

  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;

  --space-1: 4px;  --space-2: 8px;  --space-3: 12px; --space-4: 16px;
  --space-5: 24px; --space-6: 32px; --space-7: 48px; --space-8: 64px;
  --space-9: 96px;

  --fs-xs: .8125rem; --fs-sm: .9375rem; --fs-base: 1rem;
  --fs-lg: 1.125rem; --fs-xl: 1.375rem; --fs-2xl: 1.75rem;
  --fs-3xl: 2.5rem; --fs-4xl: 3.5rem;

  --maxw: 1200px;
  --maxw-narrow: 800px;
  --header-h: 68px;

  --ease: cubic-bezier(.22, 1, .36, 1);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", ui-monospace, "JetBrains Mono", Menlo, Consolas, monospace;
}

/* ---------- Dark (default) ---------- */
[data-theme="dark"] {
  --bg: #07091a;
  --bg-elev: #0e1230;
  --surface: rgba(255, 255, 255, .04);
  --surface-2: rgba(255, 255, 255, .06);
  --surface-strong: rgba(255, 255, 255, .08);
  --border: rgba(255, 255, 255, .10);
  --border-strong: rgba(255, 255, 255, .18);
  --text: #eef1ff;
  --text-soft: #b8bedb;
  --text-dim: #8b91b5;
  --shadow: 0 24px 60px -24px rgba(0, 0, 0, .7);
  --shadow-sm: 0 8px 28px -14px rgba(0, 0, 0, .6);
  --code-bg: #0a0d24;
  --aurora-op: .55;
  --header-bg: rgba(7, 9, 26, .72);
}

/* ---------- Light ---------- */
[data-theme="light"] {
  --bg: #f6f7fc;
  --bg-elev: #ffffff;
  --surface: rgba(13, 18, 56, .03);
  --surface-2: rgba(13, 18, 56, .045);
  --surface-strong: #ffffff;
  --border: rgba(13, 18, 56, .10);
  --border-strong: rgba(13, 18, 56, .18);
  --text: #0c1130;
  --text-soft: #41496f;
  --text-dim: #6b7299;
  --shadow: 0 30px 60px -30px rgba(40, 50, 120, .35);
  --shadow-sm: 0 12px 30px -18px rgba(40, 50, 120, .30);
  --code-bg: #0c1024;
  --aurora-op: .40;
  --header-bg: rgba(246, 247, 252, .78);
}

/* ---------- Reset / base ---------- */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 12px); }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  font-size: var(--fs-base);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background .4s var(--ease), color .4s var(--ease);
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
h1, h2, h3, h4 { line-height: 1.15; letter-spacing: -.02em; font-weight: 700; }
ul { list-style: none; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: var(--maxw-narrow); }
.gradient-text {
  background: linear-gradient(120deg, var(--brand-1), var(--brand-2) 55%, var(--brand-3));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

/* ---------- Background aurora ---------- */
.bg-aurora { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.blob { position: absolute; border-radius: 50%; filter: blur(90px); opacity: var(--aurora-op); }
.blob-1 { width: 540px; height: 540px; background: var(--brand-1); top: -160px; left: -120px; animation: drift 22s var(--ease) infinite alternate; }
.blob-2 { width: 480px; height: 480px; background: var(--brand-2); top: 10%; right: -140px; animation: drift 26s var(--ease) infinite alternate-reverse; }
.blob-3 { width: 420px; height: 420px; background: var(--brand-3); bottom: -160px; left: 30%; opacity: calc(var(--aurora-op) * .7); animation: drift 30s var(--ease) infinite alternate; }
.grid-overlay {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 75%);
  opacity: .5;
}
@keyframes drift { to { transform: translate3d(60px, 40px, 0) scale(1.12); } }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  background: var(--header-bg);
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease), background .3s var(--ease);
}
.site-header.scrolled { border-bottom-color: var(--border); }
.nav { display: flex; align-items: center; gap: var(--space-5); height: var(--header-h); }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.15rem; }
.brand-mark {
  display: grid; place-items: center; width: 36px; height: 36px;
  border-radius: 11px; color: #fff; background: var(--brand-grad);
  box-shadow: 0 8px 20px -8px var(--brand-1);
}
.brand-mark svg { width: 20px; height: 20px; }
.brand-name { letter-spacing: -.02em; }

.nav-links { display: flex; gap: 6px; margin-left: auto; }
.nav-links a {
  padding: 8px 14px; border-radius: var(--radius-pill);
  color: var(--text-soft); font-size: var(--fs-sm); font-weight: 500;
  transition: color .2s, background .2s;
}
.nav-links a:hover { color: var(--text); background: var(--surface-2); }
.nav-actions { display: flex; align-items: center; gap: 10px; }

.icon-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  height: 40px; min-width: 40px; padding: 0 10px;
  border: 1px solid var(--border); border-radius: var(--radius-pill);
  background: var(--surface); color: var(--text); cursor: pointer;
  font-family: inherit; font-size: var(--fs-sm); font-weight: 500;
  transition: border-color .2s, background .2s, transform .15s;
}
.icon-btn:hover { border-color: var(--border-strong); background: var(--surface-2); }
.icon-btn:active { transform: scale(.96); }
.icon-btn svg { width: 18px; height: 18px; }

/* theme toggle icon swap */
.theme-toggle .ico-sun { display: none; }
.theme-toggle .ico-moon { display: block; }
[data-theme="light"] .theme-toggle .ico-sun { display: block; }
[data-theme="light"] .theme-toggle .ico-moon { display: none; }

/* language switch */
.lang-switch { position: relative; }
.lang-btn .chev { width: 14px; height: 14px; opacity: .7; }
.lang-menu {
  position: absolute; right: 0; top: calc(100% + 8px); z-index: 120;
  min-width: 180px; padding: 6px;
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  max-height: 70vh; overflow: auto;
}
.lang-menu li {
  padding: 9px 12px; border-radius: 10px; cursor: pointer;
  font-size: var(--fs-sm); color: var(--text-soft);
  display: flex; align-items: center; gap: 10px; transition: background .15s, color .15s;
}
.lang-menu li:hover { background: var(--surface-2); color: var(--text); }
.lang-menu li.active { color: var(--text); background: var(--brand-grad-soft); }
.lang-menu li .flag { font-size: 1.1rem; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 20px; border-radius: var(--radius-pill);
  font-weight: 600; font-size: var(--fs-sm); cursor: pointer;
  border: 1px solid transparent; transition: transform .15s var(--ease), box-shadow .25s, background .2s, border-color .2s;
  white-space: nowrap;
}
.btn-lg { padding: 14px 28px; font-size: var(--fs-base); }
.btn-primary { color: #fff; background: var(--brand-grad); box-shadow: 0 12px 30px -12px var(--brand-1); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 18px 40px -12px var(--brand-1); }
.btn-ghost { color: var(--text); background: var(--surface); border-color: var(--border); }
.btn-ghost:hover { background: var(--surface-2); border-color: var(--border-strong); transform: translateY(-2px); }
.nav-cta { padding: 9px 18px; }

/* ---------- Hero ---------- */
.hero { padding: clamp(48px, 8vw, 110px) 0 var(--space-8); }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: var(--space-8); align-items: center; }
.pill {
  display: inline-flex; align-items: center; gap: 8px; padding: 7px 16px;
  border-radius: var(--radius-pill); font-size: var(--fs-xs); font-weight: 600;
  background: var(--brand-grad-soft); border: 1px solid var(--border);
  color: var(--text); margin-bottom: var(--space-5);
}
.hero-title { font-size: clamp(2.2rem, 5.2vw, var(--fs-4xl)); margin-bottom: var(--space-4); }
.hero-title span { display: block; }
.hero-sub { font-size: var(--fs-lg); color: var(--text-soft); max-width: 560px; margin-bottom: var(--space-6); }
.hero-actions { display: flex; gap: var(--space-3); flex-wrap: wrap; }
.hero-actions.center { justify-content: center; }
.hero-meta { display: flex; gap: var(--space-5); flex-wrap: wrap; margin-top: var(--space-5); color: var(--text-dim); font-size: var(--fs-sm); }
.hero-meta .check { font-weight: 500; }

/* code window */
.hero-visual { position: relative; }
.code-window {
  background: var(--code-bg); border: 1px solid var(--border-strong);
  border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow);
}
.cw-bar { display: flex; align-items: center; gap: 8px; padding: 12px 16px; background: rgba(255, 255, 255, .04); border-bottom: 1px solid rgba(255, 255, 255, .08); }
.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot.r { background: #ff5f57; } .dot.y { background: #febc2e; } .dot.g { background: #28c840; }
.cw-title { margin-left: 8px; font-family: var(--font-mono); font-size: var(--fs-xs); color: #8b91b5; }
.cw-body { padding: 18px 20px; overflow-x: auto; }
.cw-body code, .code-tabs code { font-family: var(--font-mono); font-size: .82rem; line-height: 1.75; color: #d6dcff; white-space: pre; }
.c-key { color: #c792ea; } .c-str { color: #7ee787; } .c-com { color: #6b7299; font-style: italic; }
#typedModel { color: #18c8ff; border-right: 2px solid #18c8ff; padding-right: 1px; }

.float-card {
  position: absolute; display: flex; align-items: center; gap: 10px;
  padding: 12px 16px; background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: 14px; box-shadow: var(--shadow-sm); animation: floaty 5s var(--ease) infinite alternate;
}
.float-card strong { display: block; font-size: var(--fs-sm); }
.float-card small { color: var(--text-dim); font-size: var(--fs-xs); }
.float-card .fc-ico { font-size: 1.3rem; }
.fc-1 { left: -28px; bottom: 40px; }
.fc-2 { right: -22px; top: 30px; animation-delay: 1.4s; }
@keyframes floaty { to { transform: translateY(-12px); } }

/* trust strip */
.trust-strip { margin-top: var(--space-8); padding-top: var(--space-6); border-top: 1px solid var(--border); text-align: center; }
.trust-label { display: block; color: var(--text-dim); font-size: var(--fs-xs); letter-spacing: .08em; text-transform: uppercase; margin-bottom: var(--space-4); }
.trust-logos { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: var(--space-6); }
.trust-logos .tlogo { display: inline-flex; align-items: center; gap: 8px; color: var(--text-soft); font-weight: 600; opacity: .8; transition: opacity .2s, color .2s; }
.trust-logos .tlogo:hover { opacity: 1; color: var(--text); }
.trust-logos .tlogo svg { width: 22px; height: 22px; }

/* ---------- Stats ---------- */
.stats { padding: var(--space-7) 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-4); }
.stat {
  text-align: center; padding: var(--space-6) var(--space-4);
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
}
.stat-num { font-size: var(--fs-3xl); font-weight: 800; line-height: 1;
  background: linear-gradient(120deg, var(--brand-1), var(--brand-2));
  -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat-label { margin-top: var(--space-2); color: var(--text-soft); font-size: var(--fs-sm); }

/* ---------- Sections ---------- */
.section { padding: var(--space-9) 0; }
.section-alt { background: var(--surface); border-block: 1px solid var(--border); }
.section-head { text-align: center; max-width: 720px; margin: 0 auto var(--space-7); }
.eyebrow {
  display: inline-block; padding: 5px 14px; border-radius: var(--radius-pill);
  font-size: var(--fs-xs); font-weight: 700; letter-spacing: .06em; text-transform: uppercase;
  color: var(--brand-2); background: var(--brand-grad-soft); border: 1px solid var(--border); margin-bottom: var(--space-4);
}
.section-title { font-size: clamp(1.6rem, 3.6vw, var(--fs-3xl)); margin-bottom: var(--space-4); }
.section-desc { color: var(--text-soft); font-size: var(--fs-lg); }

/* ---------- Models grid ---------- */
.models-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }
.model-card {
  position: relative; padding: var(--space-5); border-radius: var(--radius);
  background: var(--bg-elev); border: 1px solid var(--border);
  transition: transform .25s var(--ease), border-color .25s, box-shadow .25s; overflow: hidden;
}
.model-card::before {
  content: ""; position: absolute; inset: 0; opacity: 0; transition: opacity .3s;
  background: radial-gradient(120% 80% at 0% 0%, color-mix(in srgb, var(--mc, #7c5cff) 22%, transparent), transparent 60%);
}
.model-card:hover { transform: translateY(-4px); border-color: var(--border-strong); box-shadow: var(--shadow-sm); }
.model-card:hover::before { opacity: 1; }
.model-head { display: flex; align-items: center; gap: 12px; margin-bottom: var(--space-3); position: relative; }
.model-logo {
  display: grid; place-items: center; width: 44px; height: 44px; flex: 0 0 auto;
  border-radius: 12px; background: color-mix(in srgb, var(--mc, #7c5cff) 16%, var(--surface));
  color: var(--mc, #7c5cff); border: 1px solid var(--border);
}
.model-logo svg { width: 26px; height: 26px; }
.model-name { font-size: var(--fs-lg); font-weight: 700; }
.model-vendor { color: var(--text-dim); font-size: var(--fs-xs); }
.model-tag {
  position: relative; display: inline-block; margin-bottom: var(--space-3);
  padding: 3px 11px; border-radius: var(--radius-pill); font-size: var(--fs-xs); font-weight: 600;
  color: var(--mc, #7c5cff); background: color-mix(in srgb, var(--mc, #7c5cff) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--mc, #7c5cff) 30%, transparent);
}
.model-desc { position: relative; color: var(--text-soft); font-size: var(--fs-sm); }
.model-id { position: relative; margin-top: var(--space-4); font-family: var(--font-mono); font-size: var(--fs-xs); color: var(--text-dim); display: flex; align-items: center; gap: 8px; }
.model-id code { background: var(--surface-2); padding: 3px 8px; border-radius: 7px; }
.models-note { text-align: center; color: var(--text-dim); font-size: var(--fs-sm); margin-top: var(--space-6); }

/* ---------- Features ---------- */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }
.feature-card {
  padding: var(--space-5); border-radius: var(--radius);
  background: var(--bg-elev); border: 1px solid var(--border);
  transition: transform .25s var(--ease), border-color .25s;
}
.feature-card:hover { transform: translateY(-4px); border-color: var(--border-strong); }
.feature-ico {
  display: grid; place-items: center; width: 50px; height: 50px; margin-bottom: var(--space-4);
  border-radius: 14px; background: var(--brand-grad-soft); color: var(--brand-1); font-size: 1.5rem;
}
[data-theme="dark"] .feature-ico { color: var(--brand-2); }
.feature-card h3 { font-size: var(--fs-lg); margin-bottom: var(--space-2); }
.feature-card p { color: var(--text-soft); font-size: var(--fs-sm); }

/* ---------- Why ---------- */
.why-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-8); align-items: center; }
.why-list { margin: var(--space-5) 0 var(--space-6); display: grid; gap: var(--space-3); }
.why-list li { display: flex; gap: 12px; color: var(--text-soft); font-size: var(--fs-sm); }
.why-list li::before { content: "✓"; color: var(--brand-2); font-weight: 800; }
.why-list li strong { color: var(--text); }
.compare-card { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: var(--space-3);
  padding: var(--space-5); background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); }
.compare-col h4 { font-size: var(--fs-base); margin-bottom: var(--space-3); }
.compare-col ul { display: grid; gap: 10px; }
.compare-col li { font-size: var(--fs-sm); }
.compare-bad { color: var(--text-dim); } .compare-bad h4 { color: var(--text-soft); }
.compare-good li { color: var(--text-soft); } .compare-good h4 { color: var(--brand-2); }
.compare-vs { font-weight: 800; color: var(--text-dim); font-size: var(--fs-sm);
  width: 36px; height: 36px; display: grid; place-items: center; border-radius: 50%; border: 1px solid var(--border); }

/* ---------- Use cases ---------- */
.usecases-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-4); }
.usecase-card { padding: var(--space-5); background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); transition: transform .25s var(--ease), border-color .25s; }
.usecase-card:hover { transform: translateY(-4px); border-color: var(--border-strong); }
.usecase-ico { font-size: 1.8rem; margin-bottom: var(--space-3); }
.usecase-card h3 { font-size: var(--fs-base); margin-bottom: var(--space-2); }
.usecase-card p { color: var(--text-soft); font-size: var(--fs-sm); }

/* ---------- Steps + code tabs ---------- */
.steps-wrap { display: grid; grid-template-columns: 1fr 1.05fr; gap: var(--space-8); align-items: start; }
.steps-list { display: grid; gap: var(--space-4); }
.step { display: flex; gap: var(--space-4); padding: var(--space-4); border-radius: var(--radius); border: 1px solid transparent; transition: background .2s, border-color .2s; }
.step:hover { background: var(--surface); border-color: var(--border); }
.step-num { flex: 0 0 auto; width: 38px; height: 38px; display: grid; place-items: center; border-radius: 12px;
  font-weight: 800; color: #fff; background: var(--brand-grad); }
.step h3 { font-size: var(--fs-base); margin-bottom: 4px; }
.step p { color: var(--text-soft); font-size: var(--fs-sm); }
.code-tabs { background: var(--code-bg); border: 1px solid var(--border-strong); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.tabs-head { display: flex; gap: 4px; padding: 8px; background: rgba(255, 255, 255, .04); border-bottom: 1px solid rgba(255, 255, 255, .08); }
.tab { padding: 8px 16px; border-radius: 9px; border: none; background: transparent; color: #8b91b5; cursor: pointer; font-family: inherit; font-size: var(--fs-sm); font-weight: 600; transition: background .2s, color .2s; }
.tab:hover { color: #d6dcff; }
.tab.active { background: rgba(255, 255, 255, .08); color: #fff; }
.tab-panel { display: none; padding: 20px; overflow-x: auto; }
.tab-panel.active { display: block; }

/* ---------- Pricing ---------- */
.pricing-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-4); margin-bottom: var(--space-7); }
.price-card { padding: var(--space-5); background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); }
.price-ico { font-size: 1.6rem; margin-bottom: var(--space-3); }
.price-card h3 { font-size: var(--fs-base); margin-bottom: var(--space-2); }
.price-card p { color: var(--text-soft); font-size: var(--fs-sm); }
.pricing-cta { display: flex; flex-wrap: wrap; gap: var(--space-5); align-items: center; justify-content: space-between;
  padding: var(--space-6) var(--space-7); border-radius: var(--radius-lg);
  background: var(--brand-grad-soft); border: 1px solid var(--border); }
.pricing-cta h3 { font-size: var(--fs-xl); }
.pricing-cta p { color: var(--text-soft); }

/* ---------- FAQ ---------- */
.faq-list { display: grid; gap: var(--space-3); }
.faq-item { border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-elev); overflow: hidden; }
.faq-q { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: var(--space-4) var(--space-5); background: none; border: none; cursor: pointer; text-align: left;
  font-family: inherit; font-size: var(--fs-base); font-weight: 600; color: var(--text); }
.faq-q .q-icon { flex: 0 0 auto; transition: transform .3s var(--ease); color: var(--brand-2); font-size: 1.4rem; line-height: 1; }
.faq-item.open .q-icon { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .35s var(--ease); }
.faq-a-inner { padding: 0 var(--space-5) var(--space-5); color: var(--text-soft); font-size: var(--fs-sm); }

/* ---------- Final CTA ---------- */
.final-cta { padding: var(--space-9) 0; }
.final-cta-card { text-align: center; padding: clamp(40px, 7vw, 80px) var(--space-5); border-radius: var(--radius-lg);
  background: linear-gradient(135deg, color-mix(in srgb, var(--brand-1) 22%, var(--bg-elev)), color-mix(in srgb, var(--brand-2) 18%, var(--bg-elev)));
  border: 1px solid var(--border-strong); position: relative; overflow: hidden; box-shadow: var(--shadow); }
.final-cta-card h2 { font-size: clamp(1.7rem, 4vw, var(--fs-3xl)); margin-bottom: var(--space-3); }
.final-cta-card p { color: var(--text-soft); font-size: var(--fs-lg); margin-bottom: var(--space-6); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--border); padding: var(--space-8) 0 var(--space-6); margin-top: var(--space-7); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 2fr; gap: var(--space-8); }
.footer-tagline { color: var(--text-soft); font-size: var(--fs-sm); margin-top: var(--space-3); max-width: 320px; }
.footer-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-5); }
.footer-col h5 { font-size: var(--fs-sm); margin-bottom: var(--space-3); color: var(--text); }
.footer-col a { display: block; color: var(--text-soft); font-size: var(--fs-sm); padding: 4px 0; transition: color .2s; }
.footer-col a:hover { color: var(--brand-2); }
.footer-bottom { display: flex; flex-wrap: wrap; gap: var(--space-3); justify-content: space-between; align-items: center;
  margin-top: var(--space-7); padding-top: var(--space-5); border-top: 1px solid var(--border); color: var(--text-dim); font-size: var(--fs-xs); }
.footer-beian { text-align: center; margin-top: var(--space-4); color: var(--text-soft); font-size: var(--fs-xs); line-height: 1.8; }
.footer-beian p { margin: 4px 0; }
.footer-beian .beian-row { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 8px 16px; }
.footer-beian .beian-report { display: inline-flex; align-items: center; gap: 6px; }
.footer-beian img { width: 14px; height: 14px; flex: 0 0 auto; vertical-align: middle; }
.footer-beian a { color: inherit; text-decoration: none; transition: color .2s; }
.footer-beian a:hover { color: var(--brand-2); }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
.menu-toggle { display: none; }
@media (max-width: 980px) {
  .hero-grid, .why-grid, .steps-wrap { grid-template-columns: 1fr; }
  .hero-visual { order: -1; }
  .float-card { display: none; }
  .models-grid, .features-grid { grid-template-columns: repeat(2, 1fr); }
  .usecases-grid, .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .nav-links { position: fixed; inset: var(--header-h) 0 auto 0; flex-direction: column; gap: 2px;
    background: var(--bg-elev); border-bottom: 1px solid var(--border); padding: var(--space-3);
    margin-left: 0; transform: translateY(-120%); transition: transform .3s var(--ease); box-shadow: var(--shadow); }
  .nav-links.open { transform: none; }
  .nav-links a { padding: 12px 14px; }
  .menu-toggle { display: inline-flex; }
  .nav-cta { display: none; }
  .nav-links .nav-cta { display: inline-flex; text-align: center; justify-content: center; margin-top: 6px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .lang-btn span#langCurrent { display: none; }
}
@media (max-width: 540px) {
  .models-grid, .features-grid, .usecases-grid, .pricing-grid { grid-template-columns: 1fr; }
  .compare-card { grid-template-columns: 1fr; }
  .compare-vs { margin: 0 auto; }
  .hero-meta { gap: var(--space-3); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; }
}