:root {
  --bg: #fbfbfc;
  --surface: #ffffff;
  --ink: #0a0a0b;
  --ink-2: #3f3f46;
  --muted: #71717a;
  --line: rgba(10, 10, 11, 0.07);
  --line-strong: rgba(10, 10, 11, 0.12);
  --primary: #2563eb;
  --primary-soft: #eff6ff;
  --violet: #7c3aed;
  --cyan: #0891b2;
  --dark: #0a0a0b;
  --dark-2: #17171a;
  --radius: 14px;
  --radius-lg: 20px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --font: "Geist", "Noto Sans SC", "PingFang SC", sans-serif;
  --mono: "Geist Mono", "JetBrains Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
ul { list-style: none; }
code, pre { font-family: var(--mono); }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

.wrap { width: min(1120px, calc(100% - 40px)); margin-inline: auto; }
.section { padding: 100px 0; }
.center { text-align: center; }
.muted { color: var(--muted); }
.kicker {
  color: var(--primary);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

h1, h2, h3, h4 { letter-spacing: -0.04em; line-height: 1.06; font-weight: 400; }
h1 { font-size: clamp(42px, 6.2vw, 64px); }
h2 { font-size: clamp(30px, 4vw, 48px); }
h3 { font-size: 22px; font-weight: 500; letter-spacing: -0.03em; }
h4 { font-size: 17px; font-weight: 500; }

.em { font-weight: 700; color: var(--ink); }
.em-blue { color: var(--primary); font-weight: 600; }

/* ---------- 毛玻璃 ---------- */
.glass {
  background: rgba(255, 255, 255, 0.45);
  backdrop-filter: blur(28px) saturate(1.8);
  -webkit-backdrop-filter: blur(28px) saturate(1.8);
  border: 1px solid rgba(255, 255, 255, 0.6);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.85),
    0 16px 48px -24px rgba(10, 10, 11, 0.18);
}

.aurora {
  position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none;
}
.blob {
  position: absolute; border-radius: 50%; filter: blur(70px); opacity: 0.75;
}
.b1 {
  width: 640px; height: 640px; top: -180px; left: -120px;
  background: radial-gradient(circle, #60a5fa, transparent 62%);
  animation: drift-a 22s ease-in-out infinite alternate;
}
.b2 {
  width: 560px; height: 560px; top: 6%; right: -160px;
  background: radial-gradient(circle, #a78bfa, transparent 62%);
  animation: drift-b 26s ease-in-out infinite alternate;
}
.b3 {
  width: 600px; height: 600px; top: 42%; left: 26%;
  background: radial-gradient(circle, #67e8f9, transparent 62%);
  animation: drift-c 30s ease-in-out infinite alternate;
}
.b4 {
  width: 480px; height: 480px; top: 68%; right: 12%;
  background: radial-gradient(circle, #f0abfc, transparent 62%);
  animation: drift-a 34s ease-in-out infinite alternate-reverse;
}
@keyframes drift-a { to { transform: translate(90px, 60px) scale(1.12); } }
@keyframes drift-b { to { transform: translate(-80px, 90px) scale(0.94); } }
@keyframes drift-c { to { transform: translate(-60px, -70px) scale(1.08); } }

.btn {
  position: relative;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 40px; padding: 0 18px; border-radius: 999px;
  font-size: 14px; font-weight: 500;
  transition: transform 220ms var(--ease), box-shadow 220ms var(--ease), background 180ms var(--ease), border-color 180ms var(--ease);
  will-change: transform;
}
.btn:hover { transform: scale(1.045); }
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover {
  background: #1d4ed8;
  box-shadow: 0 14px 28px -10px rgba(37, 99, 235, 0.55), 0 4px 10px -4px rgba(37, 99, 235, 0.4);
}
/* 溅射粒子 */
.btn-primary::before {
  content: "";
  position: absolute; left: 50%; top: 50%;
  width: 5px; height: 5px; border-radius: 50%;
  background: transparent;
  opacity: 0;
  pointer-events: none;
}
.btn-primary:hover::before {
  animation: splash 0.7s var(--ease) forwards;
}
@keyframes splash {
  0% {
    opacity: 1;
    box-shadow: 0 0 0 0 rgba(147,197,253,0.9);
    transform: translate(-50%, -50%) scale(1);
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(1);
    box-shadow:
      0 -26px 0 1px rgba(147,197,253,0.9),
      22px -12px 0 0 rgba(191,219,254,0.9),
      24px 12px 0 1px rgba(147,197,253,0.8),
      0 26px 0 0 rgba(191,219,254,0.9),
      -22px 12px 0 1px rgba(147,197,253,0.8),
      -24px -12px 0 0 rgba(191,219,254,0.9),
      14px -24px 0 0 rgba(219,234,254,0.9),
      -14px 24px 0 0 rgba(219,234,254,0.8);
  }
}
.btn-ghost { color: var(--ink); border: 1px solid var(--line-strong); }
.btn-ghost:hover {
  border-color: var(--ink-2);
  box-shadow: 0 12px 24px -12px rgba(10, 10, 11, 0.25);
}
.btn-dark { background: var(--dark); color: #fff; }
.btn-dark:hover { background: var(--dark-2); box-shadow: 0 14px 28px -12px rgba(10, 10, 11, 0.5); }

.preview-bar {
  position: sticky; top: 0; z-index: 60;
  display: flex; justify-content: center; gap: 10px; flex-wrap: wrap;
  padding: 8px 16px;
  background: var(--dark); color: #a1a1aa; font-size: 12.5px;
}
.preview-bar a { color: #93c5fd; text-decoration: underline; text-underline-offset: 2px; }

.nav-wrap {
  position: sticky; top: 0; z-index: 50;
  display: flex; justify-content: center;
  padding: 14px 16px 0;
}
.nav {
  width: min(920px, 100%);
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 8px 8px 8px 14px;
  border-radius: 999px;
}
.brand { display: flex; align-items: center; gap: 9px; font-weight: 600; letter-spacing: -0.03em; }
.brand img { width: 28px; height: 28px; border-radius: 8px; }
.nav-links { display: flex; align-items: center; gap: 2px; color: var(--ink-2); font-size: 14px; font-weight: 500; }
.nav-links a { padding: 8px 14px; border-radius: 999px; }
.nav-links a:hover { color: var(--ink); background: rgba(10,10,11,0.05); }
.nav-cta { display: flex; align-items: center; gap: 10px; }
.login { padding: 0 8px; font-size: 14px; font-weight: 500; color: var(--ink-2); }
.nav-toggle { display: none; width: 40px; height: 40px; border-radius: 999px; border: 1px solid var(--line); }

.hero { position: relative; padding: 64px 0 40px; overflow: hidden; }
.hero .wrap { position: relative; display: grid; justify-items: center; text-align: center; }
.pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px 6px 8px; margin-bottom: 24px;
  color: var(--primary); border-radius: 999px; font-size: 13px; font-weight: 500;
}
.dot { width: 6px; height: 6px; border-radius: 50%; background: var(--primary); }
.hero p.lead { max-width: 600px; margin: 20px 0 28px; color: var(--ink-2); font-size: 17px; }
.hero-cta { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; }

.word {
  display: inline-block;
  animation: word-in 0.8s var(--ease) both;
  animation-delay: calc(var(--d) * 80ms);
}
@keyframes word-in {
  from { opacity: 0; filter: blur(12px); transform: translateY(12px); }
  to { opacity: 1; filter: blur(0); transform: none; }
}

.model-slot {
  margin-top: 24px;
  min-height: 24px;
  font-family: var(--mono);
  font-size: 14px;
  color: var(--primary);
  overflow: hidden;
}
.model-slot b { display: inline-block; animation: model-in 0.5s var(--ease); }
@keyframes model-in {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 主舞台 ---------- */
.stage {
  width: min(1040px, calc(100% - 24px));
  margin: 56px auto 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.stage-bar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
}
.traffic { display: flex; gap: 6px; }
.traffic i { width: 10px; height: 10px; border-radius: 50%; display: block; }
.traffic .r { background: #ff5f57; }
.traffic .y { background: #febc2e; }
.traffic .g { background: #28c840; }
.tabs { display: flex; gap: 4px; flex-wrap: wrap; }
.tab {
  min-height: 32px; padding: 0 14px; border-radius: 999px;
  font-size: 13px; font-weight: 500; color: var(--muted);
}
.tab:hover { color: var(--ink); background: rgba(10,10,11,0.05); }
.tab.on { color: #fff; background: var(--dark); }
.live-dot { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; }
.live-dot i {
  width: 7px; height: 7px; border-radius: 50%; background: #10b981;
  animation: pulse 1.6s ease-in-out infinite;
}
@keyframes pulse { 50% { opacity: 0.35; } }
.stage-body { min-height: 400px; padding: 20px; }
.pane { display: none; }
.pane.on { display: block; animation: pane-in 0.4s var(--ease); }
@keyframes pane-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

/* 概览：真实数据 */
.ov-grid { display: grid; grid-template-columns: 0.72fr 1.28fr; gap: 12px; }
.ov-big {
  padding: 20px; border: 1px solid var(--line); border-radius: var(--radius);
  background: rgba(255,255,255,0.72); text-align: left;
  display: flex; flex-direction: column; justify-content: center; gap: 6px;
}
.ov-big small { color: var(--muted); font-size: 12.5px; }
.ov-big b { font-size: 44px; letter-spacing: -0.05em; font-weight: 700; line-height: 1; }
.ov-chart {
  padding: 16px; border: 1px solid var(--line); border-radius: var(--radius);
  background: rgba(255,255,255,0.72); text-align: left;
}
.ov-chart-head { display: flex; justify-content: space-between; margin-bottom: 12px; }
.ov-chart-head small { color: var(--muted); font-size: 12.5px; }
.bars { display: flex; align-items: flex-end; gap: 8px; height: 150px; }
.bar-col { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 6px; height: 100%; justify-content: flex-end; }
.bar {
  width: 100%; border-radius: 6px 6px 3px 3px;
  background: linear-gradient(180deg, #60a5fa, #2563eb);
  transform-origin: bottom;
  animation: bar-up 0.7s var(--ease) both;
  animation-delay: calc(var(--i) * 60ms);
  position: relative;
}
.bar:hover { filter: brightness(1.1); }
.bar::after {
  content: attr(data-v);
  position: absolute; top: -20px; left: 50%; transform: translateX(-50%);
  font-size: 10px; color: var(--muted); font-family: var(--mono); white-space: nowrap;
  opacity: 0; transition: 160ms;
}
.bar-col:hover .bar::after { opacity: 1; }
@keyframes bar-up { from { transform: scaleY(0); } to { transform: scaleY(1); } }
.bar-col small { font-size: 10.5px; color: var(--muted); font-family: var(--mono); }
.ov-models { margin-top: 12px; text-align: left; }
.ov-models > small { font-size: 12.5px; }
#ov-top { display: grid; gap: 8px; margin-top: 10px; }
.toprow { display: grid; grid-template-columns: 150px 1fr 56px; align-items: center; gap: 10px; font-size: 12.5px; }
.toprow code { color: var(--ink); }
.toprow .tbar { height: 8px; border-radius: 999px; background: rgba(10,10,11,0.06); overflow: hidden; }
.toprow .tbar i {
  display: block; height: 100%; border-radius: 999px;
  background: linear-gradient(90deg, #93c5fd, #2563eb);
  animation: bar-x 0.8s var(--ease) both;
  animation-delay: calc(var(--i) * 50ms);
}
@keyframes bar-x { from { transform: translateX(-100%); } to { transform: none; } }
.toprow b { font-family: var(--mono); font-weight: 500; text-align: right; color: var(--ink-2); }

/* 模型 */
.models { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.model {
  display: flex; justify-content: space-between; align-items: center; gap: 10px;
  padding: 14px 16px; border: 1px solid var(--line); border-radius: var(--radius);
  background: rgba(255,255,255,0.72); text-align: left;
  transition: 180ms var(--ease);
}
.model:hover { transform: translateY(-2px); border-color: #bfdbfe; }
.model code { font-size: 13.5px; color: var(--ink); display: block; }
.model small { color: var(--muted); font-size: 12px; display: block; margin-top: 3px; }
.tag-pill {
  flex-shrink: 0; color: var(--primary); background: var(--primary-soft);
  padding: 3px 10px; border-radius: 999px; font-size: 11px; font-weight: 600;
}
.tag-img { color: #7c3aed; background: #f5f3ff; }

/* 图像 */
.shot { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); background: rgba(255,255,255,0.6); }
.shot img { width: 100%; height: auto; aspect-ratio: 16 / 9; object-fit: contain; background: #0b1220; }
.shot p { padding: 14px 16px; color: var(--muted); font-size: 13.5px; text-align: left; }
.shot p a { color: var(--primary); font-weight: 500; }

/* 工作流：真实演示叠化 */
.deck { position: relative; height: 380px; border-radius: var(--radius); overflow: hidden; }
.deck-card {
  position: absolute; inset: 0;
  margin: 0;
  opacity: 0;
  animation: xfade 20s infinite;
  background: #0f172a;
}
.deck-card:nth-child(2) { animation-delay: 5s; }
.deck-card:nth-child(3) { animation-delay: 10s; }
.deck-card:nth-child(4) { animation-delay: 15s; }
@keyframes xfade {
  0% { opacity: 0; transform: scale(1.015); }
  3.5% { opacity: 1; transform: scale(1); }
  25% { opacity: 1; }
  28.5% { opacity: 0; transform: scale(0.99); }
  100% { opacity: 0; }
}
.deck-card img, .deck-card video {
  width: 100%; height: 100%; object-fit: cover; object-position: top center;
}
.deck-card figcaption {
  position: absolute; left: 14px; bottom: 14px;
  display: flex; align-items: center; gap: 10px;
  padding: 8px 14px; border-radius: 999px;
  background: rgba(10, 10, 11, 0.55);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(255,255,255,0.18);
  color: #fff;
}
.deck-card figcaption b { font-size: 13.5px; font-weight: 600; }
.deck-card figcaption span { font-size: 11.5px; color: rgba(255,255,255,0.65); font-family: var(--mono); }
.deck-note { margin-top: 14px; text-align: center; color: var(--muted); font-size: 13px; }

/* 跑马灯 */
.marquee-wrap { padding: 40px 0 12px; overflow: hidden; }
.marquee-label { text-align: center; color: var(--muted); font-size: 13px; margin-bottom: 18px; }
.marquee { display: flex; gap: 40px; width: max-content; animation: slide 30s linear infinite; }
.marquee b { color: #a1a1aa; letter-spacing: -0.02em; font-size: 14px; font-weight: 500; font-family: var(--mono); }
@keyframes slide { to { transform: translateX(-50%); } }

/* Bento */
.bento { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 44px; }
.b-card {
  padding: 22px; border-radius: var(--radius-lg); text-align: left;
  display: flex; flex-direction: column; gap: 12px; min-height: 190px;
  transition: 200ms var(--ease);
}
.b-card:hover { transform: translateY(-3px); }
.b-card > small { color: var(--muted); font-size: 12.5px; font-weight: 500; letter-spacing: 0.04em; }
.b-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.b-head small { color: var(--muted); font-size: 12.5px; font-weight: 500; letter-spacing: 0.04em; }
.b-link {
  font-size: 12.5px; font-weight: 500; color: var(--primary);
  padding: 4px 12px; border-radius: 999px;
  border: 1px solid #dbeafe; background: var(--primary-soft);
  transition: 180ms var(--ease); white-space: nowrap;
}
.b-link:hover { background: #dbeafe; transform: translateY(-1px); }
.b-wide { grid-column: span 2; }
.b-num { font-size: 44px; letter-spacing: -0.05em; font-weight: 700; line-height: 1; }
.b-num i { font-style: normal; font-size: 16px; color: var(--muted); font-weight: 400; margin-left: 4px; }
.b-note { color: var(--muted); font-size: 12.5px; margin-top: auto; }
.pills { display: flex; flex-wrap: wrap; gap: 6px; }
.pills span {
  font-size: 12px; padding: 4px 10px; border-radius: 999px;
  background: rgba(10,10,11,0.05); color: var(--ink-2); font-weight: 500;
}
.spark-wrap { flex: 1; min-height: 120px; }
#spark { width: 100%; height: 100%; }
#spark .area { fill: url(#sparkg); opacity: 0.5; }
#spark .line { fill: none; stroke: var(--primary); stroke-width: 2.5; stroke-linecap: round; }
.mini-term {
  background: var(--dark); border-radius: 12px; padding: 14px 16px;
  font-family: var(--mono); font-size: 12.5px; color: #e4e4e7; line-height: 1.8;
  overflow-x: auto;
}
.mini-term .cm { color: #52525b; }
.mini-term .str { color: #86efac; }

/* 四大模型族价格 */
.rate-grid { display: grid; gap: 10px; flex: 1; }
.rate-row {
  display: grid; grid-template-columns: 64px 84px 1fr auto; align-items: center; gap: 12px;
  padding: 10px 14px; border: 1px solid var(--line); border-radius: 12px;
  background: rgba(255,255,255,0.72);
}
.rate-row code { font-size: 13.5px; font-weight: 600; color: var(--ink); }
.rate-badge {
  font-size: 11.5px; font-weight: 600; color: var(--primary);
  background: var(--primary-soft); padding: 3px 8px; border-radius: 999px; text-align: center;
}
.rate-bar { height: 6px; border-radius: 999px; background: rgba(10,10,11,0.06); overflow: hidden; }
.rate-bar i {
  display: block; height: 100%; border-radius: 999px;
  background: linear-gradient(90deg, #93c5fd, var(--primary));
  animation: bar-x 1s var(--ease) both;
}
.rate-row b { font-size: 12.5px; font-weight: 600; color: var(--ink-2); white-space: nowrap; }

/* 耐用性量化 */
.dur-head { display: flex; align-items: baseline; gap: 10px; }
.dur-head b {
  font-size: 40px; letter-spacing: -0.05em; font-weight: 700;
  background: linear-gradient(120deg, var(--primary), var(--violet));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.dur-head span { color: var(--ink-2); font-size: 14px; font-weight: 500; }
.dur-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; flex: 1; }
.dur-item {
  display: flex; align-items: center; gap: 10px;
  padding: 12px; border: 1px solid var(--line); border-radius: 12px;
  background: rgba(255,255,255,0.72);
  transition: 200ms var(--ease);
}
.dur-item:hover { transform: translateY(-2px); border-color: #bfdbfe; }
.dur-item i {
  font-style: normal; font-size: 20px;
  width: 40px; height: 40px; border-radius: 10px;
  display: grid; place-items: center;
  background: var(--primary-soft);
  flex-shrink: 0;
}
.dur-item b { display: block; font-size: 15px; letter-spacing: -0.02em; }
.dur-item small { display: block; color: var(--muted); font-size: 11.5px; margin-top: 2px; }

/* 数据带 */
.band { padding: 56px 0; }
.band-grid {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px;
  padding: 28px; border-radius: var(--radius-lg);
  background: var(--dark); color: #fff;
}
.band-item { text-align: center; }
.band-item b { display: block; font-size: clamp(28px, 3.4vw, 40px); letter-spacing: -0.05em; font-weight: 700; }
.band-item small { color: #a1a1aa; font-size: 12.5px; }

/* 场景 */
.quote {
  margin-top: 16px; padding: 36px; border-radius: var(--radius-lg);
  background: var(--dark); color: #fff; text-align: left;
}
.quote h2 { color: #fff; font-size: clamp(24px, 3vw, 34px); max-width: 860px; }
.quote .who { margin-top: 20px; color: #a1a1aa; font-size: 14px; }

/* 定价 */
.faq { display: grid; gap: 10px; margin-top: 40px; }
.faq details { border-radius: var(--radius); padding: 18px 20px; }
.faq summary { cursor: pointer; font-weight: 600; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq details p { margin-top: 12px; color: var(--muted); }

.cta {
  margin: 8px auto 0; padding: 80px 28px; border-radius: 24px;
  text-align: center; background: var(--dark); color: #fff;
}
.cta h2 { color: #fff; }
.cta p { max-width: 560px; margin: 16px auto 28px; color: #a1a1aa; }

.footer { padding: 64px 0 32px; }
.foot-grid { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 32px; }
.foot-brand p { color: var(--muted); margin-top: 12px; max-width: 280px; font-size: 14px; }
.foot-grid h3 { font-size: 13px; color: var(--ink-2); margin-bottom: 14px; font-weight: 600; }
.foot-grid a { display: block; color: var(--muted); font-size: 14px; padding: 6px 0; }
.foot-grid a:hover { color: var(--ink); }
.copy { margin-top: 40px; color: #a1a1aa; font-size: 13px; }

.mobile-panel {
  display: none; position: fixed; inset: 92px 16px auto; z-index: 55;
  padding: 14px; border-radius: var(--radius);
}
.mobile-panel a { display: block; padding: 10px 8px; }

@media (max-width: 960px) {
  .nav-links, .nav-cta .login { display: none; }
  .nav-toggle { display: grid; place-items: center; }
  .ov-grid, .models, .foot-grid, .band-grid { grid-template-columns: 1fr; }
  .bento { grid-template-columns: 1fr; }
  .b-wide { grid-column: span 1; }
  .rate-row { grid-template-columns: 52px 74px 1fr; }
  .rate-row b { grid-column: 1 / -1; }
  .dur-grid { grid-template-columns: repeat(2, 1fr); }
  .section { padding: 72px 0; }
  .deck { height: 300px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .marquee, .word, .model-slot b, .pane, .blob, .deck-card { animation: none; }
  .deck-card:first-child { opacity: 1; }
  * { transition: none !important; }
}