/* ============================================================
   Visound AI — 闻声绘形
   ============================================================ */

:root {
  --bg: #050507;
  --bg-soft: #08080d;
  --panel: rgba(255, 255, 255, 0.032);
  --panel-strong: rgba(255, 255, 255, 0.06);
  --line: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(255, 255, 255, 0.16);
  --text: #f2f3f8;
  --muted: #9a9cae;
  --muted-2: #6a6c7e;
  --violet: #8b5cf6;
  --violet-soft: #a78bfa;
  --cyan: #22d3ee;
  --grad: linear-gradient(100deg, #a78bfa 0%, #8b5cf6 38%, #22d3ee 100%);
  --grad-soft: linear-gradient(135deg, rgba(139, 92, 246, 0.22), rgba(34, 211, 238, 0.14));
  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 24px;
  --font: "Inter", "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: "SFMono-Regular", "JetBrains Mono", "Cascadia Mono", Consolas, "Liberation Mono", monospace;
  --display: "SF Pro Display", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body.no-scroll { overflow: hidden; }

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
em { font-style: normal; }

::selection { background: rgba(139, 92, 246, 0.45); color: #fff; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

.sr-only {
  position: absolute; width: 1px; height: 1px;
  clip-path: inset(50%); overflow: hidden; white-space: nowrap;
}

.skip-link {
  position: fixed; left: 16px; top: -60px; z-index: 300;
  padding: 10px 18px; border-radius: 999px;
  background: var(--text); color: var(--bg);
  font-size: 14px; font-weight: 600;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 16px; }

.container { width: min(1240px, 90%); margin: 0 auto; }

/* 纹理与进度条 */
.grain {
  position: fixed; inset: 0; z-index: 120;
  pointer-events: none; opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
}

.scroll-progress {
  position: fixed; top: 0; left: 0; z-index: 210;
  width: 100%; height: 2px;
  background: var(--grad);
  transform: scaleX(0); transform-origin: left;
  will-change: transform;
}

/* ============================================================
   通用组件
   ============================================================ */

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 12px 24px; border-radius: 999px;
  font-size: 15px; font-weight: 600; letter-spacing: 0.01em;
  border: 1px solid transparent;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease),
              background 0.25s ease, border-color 0.25s ease, color 0.25s ease;
  white-space: nowrap;
}
.btn svg { width: 16px; height: 16px; flex-shrink: 0; }

.btn-primary {
  background: var(--grad); color: #fff;
  box-shadow: 0 6px 24px rgba(139, 92, 246, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.25);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 36px rgba(34, 211, 238, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.3);
}
.btn-outline {
  border-color: var(--line-strong); color: var(--text);
  background: rgba(255, 255, 255, 0.02);
}
.btn-outline:hover { border-color: var(--cyan); color: var(--cyan); transform: translateY(-2px); }
.btn-ghost { color: var(--muted); }
.btn-ghost:hover { color: var(--text); }
.btn-light { background: #f2f3f8; color: #08080d; }
.btn-light:hover { transform: translateY(-2px); box-shadow: 0 10px 28px rgba(242, 243, 248, 0.18); }
.btn-sm { padding: 9px 18px; font-size: 14px; }
.btn-lg { padding: 15px 30px; font-size: 15.5px; }
.btn-block { width: 100%; }

.kicker {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.28em;
  color: var(--cyan); text-transform: uppercase;
}
.kicker span {
  display: inline-grid; place-items: center;
  width: 28px; height: 28px; border-radius: 50%;
  border: 1px solid rgba(34, 211, 238, 0.35);
  background: rgba(34, 211, 238, 0.08);
  font-size: 10.5px; letter-spacing: 0; color: var(--cyan);
}
.kicker::after {
  content: ""; width: 44px; height: 1px;
  background: linear-gradient(90deg, rgba(34, 211, 238, 0.5), transparent);
}
.kicker-center { justify-content: center; }
.kicker-center::before {
  content: ""; width: 44px; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(34, 211, 238, 0.5));
}

/* ============================================================
   导航
   ============================================================ */

.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  transition: background 0.3s ease, border-color 0.3s ease, backdrop-filter 0.3s ease;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(5, 5, 7, 0.72);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  border-bottom-color: var(--line);
}
.nav-inner { display: flex; align-items: center; gap: 32px; height: 76px; }

.brand { display: inline-flex; align-items: center; }
.brand-logo { height: 36px; width: auto; display: block; }

.nav-links { display: flex; gap: 30px; margin-left: auto; }
.nav-links a {
  position: relative; font-size: 14.5px; color: var(--muted);
  transition: color 0.2s ease; padding: 6px 0;
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0;
  height: 1px; background: var(--grad);
  transform: scaleX(0); transform-origin: left;
  transition: transform 0.28s var(--ease);
}
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-links a:hover::after, .nav-links a.active::after { transform: scaleX(1); }

.nav-actions { display: flex; align-items: center; gap: 18px; }
.link-login { font-size: 14.5px; color: var(--muted); transition: color 0.2s ease; }
.link-login:hover { color: var(--text); }

.nav-toggle {
  display: none; flex-direction: column; gap: 6px;
  width: 44px; height: 44px; align-items: center; justify-content: center;
  margin-left: auto;
}
.nav-toggle span {
  display: block; width: 22px; height: 1.5px; background: var(--text);
  transition: transform 0.28s var(--ease), opacity 0.2s ease;
}
.nav-toggle[aria-expanded="true"] span:first-child { transform: translateY(3.75px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:last-child { transform: translateY(-3.75px) rotate(-45deg); }

.nav-mobile {
  display: flex; flex-direction: column; gap: 2px;
  padding: 10px 5% 22px;
  background: rgba(5, 5, 7, 0.97);
  border-bottom: 1px solid var(--line);
}
.nav-mobile[hidden] { display: none; }
.nav-mobile a { padding: 13px 10px; font-size: 16px; color: var(--muted); border-radius: 8px; }
.nav-mobile a:hover { color: var(--text); background: var(--panel); }
.nav-mobile .btn { margin-top: 12px; color: #fff; }

/* ============================================================
   首屏
   ============================================================ */

.hero {
  position: relative; min-height: 100svh;
  display: flex; align-items: center;
  padding: 96px 0 88px;
  overflow: hidden;
}
.hero-media { position: absolute; inset: 0; z-index: 0; }
.hero-media img {
  width: 100%; height: 100%; object-fit: cover;
  object-position: 68% 50%;
  opacity: 0.92;
}
.hero-veil {
  position: absolute; inset: 0; z-index: 1;
  background:
    linear-gradient(90deg, #050507 0%, rgba(5, 5, 7, 0.94) 30%, rgba(5, 5, 7, 0.55) 55%, rgba(5, 5, 7, 0.12) 78%, rgba(5, 5, 7, 0.55) 100%),
    linear-gradient(180deg, rgba(5, 5, 7, 0.55) 0%, transparent 22%, transparent 62%, #050507 97%);
}
.hero-gridlines {
  position: absolute; inset: 0; z-index: 1;
  display: grid; grid-template-columns: repeat(4, 1fr);
  width: min(1240px, 90%); margin: 0 auto;
  pointer-events: none;
}
.hero-gridlines i { border-left: 1px solid rgba(255, 255, 255, 0.045); }
.hero-gridlines i:last-child { border-right: 1px solid rgba(255, 255, 255, 0.045); }

.hero-layout { position: relative; z-index: 2; }

.hero-copy { max-width: 720px; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--mono); font-size: 11.5px;
  letter-spacing: 0.22em; color: var(--cyan);
  text-transform: uppercase; margin-bottom: 18px;
  padding: 7px 14px 7px 10px; border-radius: 999px;
  border: 1px solid rgba(34, 211, 238, 0.22);
  background: rgba(34, 211, 238, 0.05);
}
.pulse {
  position: relative; width: 7px; height: 7px; border-radius: 50%;
  background: var(--cyan); box-shadow: 0 0 10px var(--cyan);
}
.pulse::after {
  content: ""; position: absolute; inset: -4px; border-radius: 50%;
  border: 1px solid rgba(34, 211, 238, 0.5);
  animation: pulse 2.4s ease-out infinite;
}
@keyframes pulse {
  0% { transform: scale(0.6); opacity: 0.9; }
  70%, 100% { transform: scale(1.6); opacity: 0; }
}

.hero-title {
  font-family: var(--display);
  font-size: clamp(40px, 5.6vw, 78px);
  font-weight: 800; line-height: 1.05;
  letter-spacing: -0.045em;
  white-space: nowrap;
}
.hero-title .line { display: inline; }
.line-gradient {
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
  background-size: 180% 100%;
  animation: gradShift 9s ease-in-out infinite alternate;
  filter: drop-shadow(0 0 34px rgba(139, 92, 246, 0.28));
}
.cjk-dot {
  display: inline-block;
  width: 0.12em; height: 0.12em; border-radius: 50%;
  margin-left: 0.1em;
  background: var(--cyan);
  box-shadow: 0 0 26px rgba(34, 211, 238, 0.75);
  transform: translateY(-0.55em);
}
@keyframes gradShift {
  from { background-position: 0% 50%; }
  to { background-position: 100% 50%; }
}

.hero-latin {
  margin-top: 16px;
  font-family: var(--mono); font-size: 10.5px;
  letter-spacing: 0.34em; color: var(--muted-2);
}
.hero-lede {
  margin-top: 14px; max-width: 620px;
  font-size: 15.5px; line-height: 1.75; color: var(--muted);
}

.console {
  margin-top: 20px; max-width: 640px;
  border-radius: var(--r-md);
  border: 1px solid rgba(139, 92, 246, 0.28);
  background: rgba(12, 12, 20, 0.82);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.55), inset 0 1px 0 rgba(255, 255, 255, 0.05);
  overflow: hidden;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.console:hover {
  border-color: rgba(34, 211, 238, 0.4);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(34, 211, 238, 0.08);
}
.console-bar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 16px; border-bottom: 1px solid var(--line);
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.14em;
  color: var(--muted-2); text-transform: uppercase;
}
.console-tag {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--cyan);
}
.console-tag::before {
  content: ""; width: 5px; height: 5px; border-radius: 50%;
  background: var(--cyan); box-shadow: 0 0 8px var(--cyan);
}
.console-body {
  display: flex; align-items: center; gap: 12px;
  padding: 16px 18px; min-height: 62px;
}
.console-wave { width: 20px; height: 20px; color: var(--violet-soft); flex-shrink: 0; }
.console-text { font-size: 15.5px; color: var(--text); line-height: 1.6; }
.caret {
  width: 2px; height: 20px; flex-shrink: 0;
  background: var(--cyan); box-shadow: 0 0 8px rgba(34, 211, 238, 0.8);
  animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }
.console-foot {
  display: flex; justify-content: space-between;
  padding: 9px 16px; border-top: 1px solid var(--line);
  font-family: var(--mono); font-size: 10.5px; color: var(--muted-2);
  letter-spacing: 0.08em;
}

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 20px; }

.hero-side { display: block; }

.hero-stats {
  display: flex; flex-direction: column;
  padding: 22px 26px;
  border: 1px solid var(--line); border-radius: var(--r-md);
  background: rgba(9, 9, 14, 0.58);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
}
.hero-stats li {
  display: flex; align-items: baseline; justify-content: space-between; gap: 18px;
  padding: 13px 0;
}
.hero-stats li:first-child { padding-top: 2px; }
.hero-stats li:last-child { padding-bottom: 2px; }
.hero-stats li + li { border-top: 1px solid rgba(255, 255, 255, 0.07); }
.hero-stats strong {
  font-family: "Bahnschrift", "DIN Alternate", var(--display);
  font-size: 30px; font-weight: 700; line-height: 1.15;
  letter-spacing: -0.02em;
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-stats strong span { font-size: 15px; margin-left: 2px; }
.hero-stats em { font-size: 12.5px; color: var(--muted-2); letter-spacing: 0.02em; text-align: right; }

@media (min-width: 1081px) {
  .hero-layout {
    display: grid; grid-template-columns: minmax(0, 1fr) 320px;
    gap: 56px; align-items: center;
  }
}

.signal {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 3;
  display: flex; align-items: center; gap: 26px;
  height: 78px; padding: 0 max(5%, calc((100% - 1240px) / 2));
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(5, 5, 7, 0.1), rgba(5, 5, 7, 0.62));
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  overflow: hidden;
}
.signal-bars {
  display: flex; align-items: center; gap: 3px;
  height: 34px; width: 170px; flex-shrink: 0;
}
.signal-bars span {
  display: block; width: 2px; border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--violet));
  opacity: 0.55;
  animation: barWave 1.8s ease-in-out infinite;
}
@keyframes barWave {
  0%, 100% { transform: scaleY(0.35); }
  50% { transform: scaleY(1); }
}
.signal-marquee {
  flex: 1; min-width: 0; overflow: hidden;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}
.signal-marquee .marquee-track {
  display: flex; align-items: center; gap: 26px;
  width: max-content; animation: marquee 30s linear infinite;
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.24em;
  color: var(--muted-2); white-space: nowrap;
}
.signal-marquee i { font-style: normal; font-size: 6px; color: rgba(34, 211, 238, 0.55); }
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }

/* ============================================================
   区块
   ============================================================ */

.section { position: relative; padding: 130px 0; }
.section-tint {
  background:
    radial-gradient(900px 420px at 80% 0%, rgba(139, 92, 246, 0.07), transparent 70%),
    var(--bg-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-head { max-width: 760px; margin-bottom: 64px; }
.section-head h2 {
  margin-top: 22px;
  font-family: var(--display);
  font-size: clamp(34px, 4.4vw, 54px);
  font-weight: 800; line-height: 1.2; letter-spacing: -0.035em;
}
.section-lede {
  margin-top: 20px; max-width: 620px;
  font-size: 16px; line-height: 1.85; color: var(--muted);
}
.section-head-split {
  max-width: none; display: grid;
  grid-template-columns: 1.35fr 1fr; gap: 56px;
  align-items: end;
}
.section-head-split .section-lede { margin-top: 0; padding-bottom: 6px; }

.br-sm { display: none; }
.br-lg { display: none; }

/* 滚动出现 */
.reveal {
  opacity: 0; transform: translateY(26px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}
.reveal.in { opacity: 1; transform: none; }

/* ============================================================
   核心引擎
   ============================================================ */

.engine-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }

.engine-card {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--panel);
  overflow: hidden;
  transition: transform 0.4s var(--ease), border-color 0.3s ease, background 0.3s ease;
}
.engine-card::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  border-radius: inherit;
  background: radial-gradient(340px circle at var(--mx, 50%) var(--my, 0%), rgba(139, 92, 246, 0.14), transparent 65%);
  opacity: 0; transition: opacity 0.35s ease;
}
.engine-card:hover { transform: translateY(-6px); border-color: rgba(139, 92, 246, 0.35); background: rgba(255, 255, 255, 0.045); }
.engine-card:hover::after { opacity: 1; }

.engine-visual {
  position: relative; height: 330px; overflow: hidden;
  border-bottom: 1px solid var(--line);
}
.engine-visual::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(180deg, transparent 55%, rgba(8, 8, 13, 0.55));
}
.engine-visual > img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.8s var(--ease);
}
.engine-card:hover .engine-visual > img { transform: scale(1.045); }

.chip {
  position: absolute; z-index: 2;
  font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.14em;
  padding: 5px 9px; border-radius: 5px;
  color: rgba(255, 255, 255, 0.82);
  background: rgba(5, 5, 7, 0.62);
  border: 1px solid rgba(255, 255, 255, 0.14);
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
}
.chip-top { top: 16px; left: 16px; }
.chip-bottom { bottom: 16px; right: 16px; color: var(--cyan); border-color: rgba(34, 211, 238, 0.3); }

/* 文案引擎 mock */
.visual-copy {
  display: grid; place-items: center;
  background:
    radial-gradient(420px 300px at 70% 20%, rgba(139, 92, 246, 0.25), transparent 70%),
    radial-gradient(360px 260px at 10% 90%, rgba(34, 211, 238, 0.12), transparent 70%),
    #0a0a12;
}
.doc {
  width: 76%; min-height: 240px;
  padding: 22px 22px 26px;
  border-radius: 12px;
  background: #f4f2ed;
  color: #17171d;
  transform: rotate(-2.2deg);
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.45);
  transition: transform 0.6s var(--ease);
}
.engine-card:hover .doc { transform: rotate(0deg) translateY(-4px); }
.doc-top { display: flex; gap: 5px; align-items: center; margin-bottom: 18px; }
.doc-top span { width: 6px; height: 6px; border-radius: 50%; background: #d6d2c8; }
.doc-top i { margin-left: auto; font-style: normal; font-family: var(--mono); font-size: 8.5px; letter-spacing: 0.06em; color: #8a867c; }
.doc-title { font-size: 19px; font-weight: 700; line-height: 1.4; letter-spacing: -0.01em; margin-bottom: 14px; }
.doc-line { height: 6px; border-radius: 3px; background: #dfdbd2; margin-bottom: 8px; }
.doc-line.w90 { width: 90%; } .doc-line.w76 { width: 76%; } .doc-line.w84 { width: 84%; }
.doc-hl { margin-top: 14px; font-size: 11px; font-weight: 600; color: #6d4fd8; letter-spacing: 0.02em; }
.doc-hl span { color: #b9aef2; }
.doc-cursor { width: 1.5px; height: 14px; background: #6d4fd8; margin-top: 12px; animation: blink 1s steps(1) infinite; }

/* 声音引擎 mock */
.visual-voice {
  display: flex; flex-direction: column; justify-content: center; gap: 20px;
  padding: 0 26px;
  background:
    radial-gradient(400px 280px at 50% 50%, rgba(139, 92, 246, 0.22), transparent 72%),
    radial-gradient(300px 220px at 90% 100%, rgba(34, 211, 238, 0.12), transparent 70%),
    #0a0a12;
}
.voice-ui {
  display: flex; align-items: center; gap: 16px;
  padding: 14px 16px;
  border: 1px solid rgba(139, 92, 246, 0.24);
  border-radius: 14px;
  background: rgba(12, 12, 20, 0.72);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
}
.voice-play {
  display: grid; place-items: center;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--grad); color: #fff;
  box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4);
  flex-shrink: 0;
  transition: transform 0.2s ease;
}
.voice-play:hover { transform: scale(1.06); }
.voice-play svg { width: 17px; height: 17px; fill: currentColor; }
.voice-play .icon-play { display: none; }
.visual-voice.paused .icon-pause { display: none; }
.visual-voice.paused .icon-play { display: block; }
.voice-bars {
  display: flex; align-items: center; gap: 2.5px;
  height: 38px; flex: 1; min-width: 0;
}
.voice-bars span {
  flex: 1; min-width: 1px; max-width: 3px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--violet));
  transform-origin: center;
  animation: voiceWave 1.1s ease-in-out infinite;
}
.visual-voice.paused .voice-bars span { animation-play-state: paused; }
@keyframes voiceWave {
  0%, 100% { transform: scaleY(0.28); opacity: 0.55; }
  50% { transform: scaleY(1); opacity: 1; }
}
.voice-time { font-family: var(--mono); font-size: 10.5px; color: var(--muted-2); flex-shrink: 0; }
.voice-meta {
  display: flex; justify-content: space-between; gap: 12px;
  font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.1em;
  color: var(--muted-2); text-transform: uppercase;
}

.engine-body { position: relative; padding: 26px 26px 28px; }
.engine-index {
  position: absolute; top: 24px; right: 26px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.12em;
  color: var(--muted-2);
}
.engine-body h3 {
  display: flex; align-items: baseline; gap: 10px;
  font-size: 20px; font-weight: 700; letter-spacing: -0.01em;
}
.engine-body h3 em {
  font-family: var(--mono); font-size: 10px; font-weight: 400;
  letter-spacing: 0.2em; color: var(--muted-2); text-transform: uppercase;
}
.engine-body > p { margin-top: 10px; font-size: 14px; line-height: 1.8; color: var(--muted); }
.tags { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 18px; }
.tags li {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.06em;
  padding: 4px 10px; border-radius: 999px;
  color: var(--muted); border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
}

/* ============================================================
   创作流程
   ============================================================ */

.flow {
  position: relative;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
  padding-top: 12px;
}
.flow::before {
  content: ""; position: absolute; top: 18px; left: 2%; right: 2%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(139, 92, 246, 0.55), rgba(34, 211, 238, 0.45), transparent);
}
.flow-step {
  position: relative;
  padding: 52px 4px 0;
}
.flow-dot {
  position: absolute; top: 12px; left: 4px;
  width: 13px; height: 13px; border-radius: 50%;
  background: var(--grad);
  box-shadow: 0 0 0 5px rgba(139, 92, 246, 0.12), 0 0 18px rgba(139, 92, 246, 0.6);
  z-index: 1;
}
.flow-step:nth-child(2) .flow-dot { box-shadow: 0 0 0 5px rgba(139, 92, 246, 0.12), 0 0 18px rgba(114, 158, 246, 0.55); }
.flow-step:nth-child(3) .flow-dot { box-shadow: 0 0 0 5px rgba(34, 211, 238, 0.1), 0 0 18px rgba(70, 190, 240, 0.55); }
.flow-step:nth-child(4) .flow-dot { box-shadow: 0 0 0 5px rgba(34, 211, 238, 0.1), 0 0 18px rgba(34, 211, 238, 0.55); }
.flow-ghost {
  position: absolute; top: 34px; right: 6px;
  font-family: "Bahnschrift", var(--display);
  font-size: 64px; font-weight: 800; line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 255, 255, 0.11);
  pointer-events: none;
}
.flow-step h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; letter-spacing: -0.01em; }
.flow-step p { font-size: 14px; line-height: 1.8; color: var(--muted); max-width: 260px; }
.flow-step code {
  display: inline-block; margin-top: 18px;
  font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.2em;
  color: var(--cyan); opacity: 0.75;
}
.flow-note {
  display: flex; align-items: center; justify-content: center; gap: 9px;
  margin-top: 64px; font-size: 13.5px; color: var(--muted-2);
}
.flow-note svg { width: 15px; height: 15px; color: var(--cyan); }

/* ============================================================
   应用场景
   ============================================================ */

.scene-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.scene-card {
  position: relative; overflow: hidden;
  padding: 30px 28px 26px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--panel);
  transition: transform 0.35s var(--ease), border-color 0.3s ease, background 0.3s ease;
}
.scene-card::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(300px circle at var(--mx, 50%) var(--my, 0%), rgba(34, 211, 238, 0.1), transparent 70%);
  opacity: 0; transition: opacity 0.35s ease;
}
.scene-card:hover { transform: translateY(-4px); border-color: rgba(34, 211, 238, 0.3); background: rgba(255, 255, 255, 0.045); }
.scene-card:hover::after { opacity: 1; }
.scene-icon {
  display: grid; place-items: center;
  width: 44px; height: 44px; border-radius: 12px;
  border: 1px solid rgba(139, 92, 246, 0.25);
  background: var(--grad-soft);
  margin-bottom: 22px;
}
.scene-icon svg {
  width: 22px; height: 22px;
  stroke: var(--violet-soft); fill: none;
  stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round;
  transition: stroke 0.3s ease;
}
.scene-card:hover .scene-icon svg { stroke: var(--cyan); }
.scene-card h3 { font-size: 17px; font-weight: 700; letter-spacing: -0.01em; }
.scene-card p { margin-top: 8px; font-size: 13.8px; line-height: 1.75; color: var(--muted); }
.scene-meta {
  display: block; margin-top: 18px; padding-top: 14px;
  border-top: 1px solid var(--line);
  font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.14em;
  color: var(--muted-2); text-transform: uppercase;
}

/* ============================================================
   作品画廊
   ============================================================ */

.gallery {
  display: grid; grid-template-columns: repeat(12, 1fr);
  gap: 22px 20px; align-items: start;
}
.shot { position: relative; }
.shot-a { grid-column: span 5; }
.shot-b { grid-column: span 3; }
.shot-c { grid-column: span 4; }
.shot-d { grid-column: span 3; }
.shot-e { grid-column: span 5; }
.shot-f { grid-column: span 4; }

.shot-btn {
  position: relative; display: block; width: 100%;
  border-radius: var(--r-md); overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel);
  cursor: zoom-in;
  transition: border-color 0.3s ease, transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
}
.shot-btn::after {
  content: "VIEW PROMPT ↗";
  position: absolute; right: 14px; top: 14px;
  font-family: var(--mono); font-size: 9px; letter-spacing: 0.16em;
  padding: 6px 10px; border-radius: 5px;
  color: #fff; background: rgba(5, 5, 7, 0.66);
  border: 1px solid rgba(255, 255, 255, 0.18);
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
  opacity: 0; transform: translateY(-5px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}
.shot-btn:hover::after, .shot-btn:focus-visible::after { opacity: 1; transform: none; }
.shot-btn:hover { border-color: rgba(139, 92, 246, 0.45); box-shadow: 0 24px 60px rgba(0, 0, 0, 0.55); }
.shot-btn img {
  width: 100%; height: 470px; object-fit: cover;
  transition: transform 0.9s var(--ease), filter 0.6s ease;
}
.shot-btn:hover img { transform: scale(1.035); filter: saturate(1.08); }

.shot figcaption { padding: 14px 2px 0; }
.shot-tags { display: flex; gap: 6px; margin-bottom: 7px; }
.shot-tags span {
  font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.08em;
  padding: 3px 8px; border-radius: 999px;
  color: var(--cyan); border: 1px solid rgba(34, 211, 238, 0.28);
  background: rgba(34, 211, 238, 0.05);
}
.shot figcaption p { font-size: 13px; line-height: 1.7; color: var(--muted-2); }

/* ============================================================
   企业定制
   ============================================================ */

.custom {
  display: grid; grid-template-columns: 1.25fr 0.75fr;
  gap: 80px; align-items: stretch;
}
.custom-left, .custom-right { min-width: 0; }
.custom-left h2 {
  margin-top: 22px;
  font-family: var(--display);
  font-size: clamp(30px, 3.7vw, 46px);
  font-weight: 800; line-height: 1.3; letter-spacing: -0.035em;
}
.custom-word {
  margin-top: 54px;
  font-family: "Bahnschrift", var(--display);
  font-size: clamp(88px, 13vw, 176px);
  font-weight: 800; line-height: 0.85; letter-spacing: -0.05em;
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 0 40px rgba(139, 92, 246, 0.22));
}
.custom-tag { margin-top: 18px; font-size: 14px; color: var(--muted); letter-spacing: 0.02em; }

.custom-marquee {
  margin-top: 64px; overflow: hidden;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
}
.marquee-slow {
  display: flex; align-items: center; gap: 22px;
  width: max-content; animation: marquee 26s linear infinite;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.16em;
  color: var(--muted-2); text-transform: uppercase; white-space: nowrap;
}
.marquee-slow i { font-style: normal; font-size: 6px; color: rgba(34, 211, 238, 0.5); }

.marquee-brands {
  gap: 48px;
  font-family: var(--font); font-size: 15px; font-weight: 600;
  letter-spacing: 0.01em; text-transform: none;
  color: rgba(255, 255, 255, 0.64);
}
.mq-brand { display: inline-flex; align-items: center; gap: 9px; }
.mq-brand svg {
  width: 18px; height: 18px; flex: none;
  fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round;
  color: rgba(255, 255, 255, 0.48);
}
.mq-brand svg circle { fill: currentColor; stroke: none; }

.custom-right {
  display: flex; flex-direction: column;
  padding: 38px 36px 32px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background:
    radial-gradient(420px 260px at 100% 0%, rgba(139, 92, 246, 0.12), transparent 70%),
    var(--panel);
}
.custom-label {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.24em;
  color: var(--cyan); text-transform: uppercase; margin-bottom: 26px;
}
.custom-list { display: flex; flex-direction: column; gap: 15px; margin-bottom: 34px; }
.custom-list li {
  position: relative; padding-left: 28px;
  font-size: 14px; color: var(--muted); line-height: 1.6;
}
.custom-list li::before {
  content: ""; position: absolute; left: 0; top: 3px;
  width: 16px; height: 16px;
  background: no-repeat center / contain url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Ccircle cx='8' cy='8' r='7.4' fill='%2322d3ee' opacity='.12'/%3E%3Cpath d='M4.6 8.2l2.2 2.2 4.6-4.6' stroke='%2322d3ee' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
}
.custom-right .btn { margin-top: auto; }
.custom-foot { margin-top: 12px; text-align: center; font-size: 11.5px; color: var(--muted-2); }

/* ============================================================
   底部 CTA
   ============================================================ */

.cta {
  position: relative; overflow: hidden;
  padding: 170px 0 160px;
  text-align: center;
  border-top: 1px solid var(--line);
}
.cta-glow {
  position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(720px 380px at 50% 118%, rgba(139, 92, 246, 0.32), transparent 70%),
    radial-gradient(520px 280px at 18% -10%, rgba(34, 211, 238, 0.12), transparent 70%),
    radial-gradient(420px 260px at 88% 10%, rgba(139, 92, 246, 0.1), transparent 70%);
}
.cta-inner { position: relative; }
.cta h2 {
  margin-top: 24px;
  font-family: var(--display);
  font-size: clamp(36px, 5.4vw, 66px);
  font-weight: 800; line-height: 1.16; letter-spacing: -0.04em;
}
.cta-lede { margin: 20px auto 36px; max-width: 480px; font-size: 15.5px; color: var(--muted); }
.cta-form { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.cta-form input {
  width: min(360px, 100%);
  padding: 15px 22px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.045);
  color: var(--text); font-family: var(--font); font-size: 14.5px;
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  transition: border-color 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
}
.cta-form input::placeholder { color: var(--muted-2); }
.cta-form input:focus {
  outline: none; border-color: rgba(34, 211, 238, 0.65);
  background: rgba(255, 255, 255, 0.06);
  box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.12);
}
.cta-msg { min-height: 1.6em; margin-top: 16px; font-size: 13.5px; color: var(--cyan); }
.cta-msg.error { color: #fb7185; }

/* ============================================================
   页脚
   ============================================================ */

.footer { border-top: 1px solid var(--line); background: #040406; padding: 72px 0 26px; }
.footer-top {
  display: grid; grid-template-columns: 1.7fr 1fr 1fr 1fr;
  gap: 48px; margin-bottom: 56px;
}
.footer-brand p { margin-top: 18px; font-size: 13.5px; line-height: 1.9; color: var(--muted-2); }
.footer-col { display: flex; flex-direction: column; gap: 13px; }
.footer-col h4 {
  font-family: var(--mono); font-size: 12.5px; font-weight: 500;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--muted-2); margin-bottom: 5px;
}
.footer-col a { width: fit-content; font-size: 14px; color: var(--muted); transition: color 0.2s ease; }
.footer-col a:hover { color: var(--cyan); }

.footer-wordmark {
  font-family: "Bahnschrift", var(--display);
  font-size: clamp(64px, 15.5vw, 196px);
  font-weight: 800; line-height: 0.78; letter-spacing: 0.015em;
  text-align: center;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 255, 255, 0.13);
  user-select: none;
  margin: 10px 0 44px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.09), transparent 78%);
  -webkit-background-clip: text; background-clip: text;
}

.footer-bottom {
  display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap;
  padding-top: 24px; border-top: 1px solid var(--line);
  font-size: 12.5px; color: var(--muted-2);
}

/* ============================================================
   灯箱
   ============================================================ */

.lightbox { position: fixed; inset: 0; z-index: 250; display: grid; place-items: center; }
.lightbox[hidden] { display: none; }
.lightbox-backdrop {
  position: absolute; inset: 0;
  background: rgba(3, 3, 6, 0.86);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
}
.lightbox-panel {
  position: relative;
  display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(300px, 0.7fr);
  width: min(1080px, 92vw); max-height: 86vh;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-lg);
  background: #0a0a10;
  overflow: hidden;
  box-shadow: 0 40px 120px rgba(0, 0, 0, 0.7);
  animation: lbIn 0.35s var(--ease);
}
@keyframes lbIn {
  from { opacity: 0; transform: translateY(18px) scale(0.985); }
  to { opacity: 1; transform: none; }
}
.lightbox-stage { position: relative; background: #050507; min-height: 0; }
.lightbox-stage img {
  width: 100%; height: 100%; max-height: 86vh;
  object-fit: contain;
}
.lb-nav {
  position: absolute; top: 50%; transform: translateY(-50%);
  display: grid; place-items: center;
  width: 42px; height: 42px; border-radius: 50%;
  background: rgba(5, 5, 7, 0.6);
  border: 1px solid var(--line-strong);
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
  transition: background 0.2s ease, border-color 0.2s ease;
}
.lb-nav:hover { background: rgba(139, 92, 246, 0.28); border-color: rgba(139, 92, 246, 0.5); }
.lb-nav svg { width: 18px; height: 18px; }
.lb-prev { left: 14px; }
.lb-next { right: 14px; }

.lightbox-info {
  display: flex; flex-direction: column;
  padding: 28px 28px 24px;
  border-left: 1px solid var(--line);
}
.lb-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 28px; }
.lb-count { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.18em; color: var(--muted-2); }
.lb-close {
  display: grid; place-items: center;
  width: 34px; height: 34px; border-radius: 50%;
  border: 1px solid var(--line); color: var(--muted);
  transition: color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}
.lb-close:hover { color: var(--text); border-color: var(--line-strong); transform: rotate(90deg); }
.lb-close svg { width: 16px; height: 16px; }
.lb-tags { display: flex; gap: 7px; flex-wrap: wrap; margin-bottom: 18px; }
.lb-tags span {
  font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.08em;
  padding: 4px 9px; border-radius: 999px;
  color: var(--cyan); border: 1px solid rgba(34, 211, 238, 0.3);
  background: rgba(34, 211, 238, 0.06);
}
.lb-prompt { font-size: 16px; line-height: 1.8; color: var(--text); }
.btn-copy { margin-top: auto; }
.lb-note { margin-top: 12px; font-size: 11px; color: var(--muted-2); }

/* ============================================================
   响应式
   ============================================================ */

@media (min-width: 901px) {
  .br-lg { display: block; }
}

@media (max-width: 1080px) {
  .engine-grid { grid-template-columns: repeat(2, 1fr); }
  .engine-card:last-child { grid-column: span 2; }
  .engine-card:last-child .engine-visual { height: 300px; }
  .scene-grid { grid-template-columns: repeat(2, 1fr); }
  .custom { grid-template-columns: 1fr; gap: 56px; }
  .custom-right { padding: 34px; }
  .section-head-split { grid-template-columns: 1fr; gap: 20px; }
  .section-head-split .section-lede { margin-top: 0; }
  .hero-stats {
    flex-direction: row; flex-wrap: wrap; gap: 44px;
    margin-top: 24px; padding: 20px 0 0;
    border: 0; border-top: 1px solid var(--line); border-radius: 0;
    background: none; backdrop-filter: none; -webkit-backdrop-filter: none;
    max-width: 600px;
  }
  .hero-stats li { flex-direction: column; align-items: flex-start; gap: 2px; padding: 0; }
  .hero-stats li + li { border-top: 0; }
  .hero-stats em { text-align: left; }
  .shot-a { grid-column: span 7; }
  .shot-b { grid-column: span 5; margin-top: 0; }
  .shot-c { grid-column: span 6; }
  .shot-d { grid-column: span 6; margin-top: 0; }
  .shot-e { grid-column: span 7; }
  .shot-f { grid-column: span 5; margin-top: 0; }
  .shot-btn img { height: 380px; }
}

@media (max-width: 900px) {
  .nav-links, .nav-actions { display: none; }
  .nav-toggle { display: flex; }
  .hero { padding: 130px 0 140px; min-height: 100svh; }
  .hero-media img { object-position: 72% 50%; opacity: 0.6; }
  .hero-veil {
    background:
      linear-gradient(180deg, rgba(5, 5, 7, 0.72) 0%, rgba(5, 5, 7, 0.55) 45%, #050507 92%),
      linear-gradient(90deg, rgba(5, 5, 7, 0.8), rgba(5, 5, 7, 0.35));
  }
  .hero-gridlines { display: none; }
  .hero-copy { max-width: 100%; }
  .section { padding: 96px 0; }
  .flow { grid-template-columns: repeat(2, 1fr); gap: 36px 20px; }
  .shot-btn img { height: 300px; }
  .flow::before { display: none; }
  .flow-step { padding-top: 0; padding-left: 26px; }
  .flow-dot { top: 8px; left: 0; }
  .flow-ghost { top: -6px; right: 0; font-size: 52px; }
  .custom-word { margin-top: 40px; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 40px; }
  .footer-brand { grid-column: span 2; }
  .lightbox-panel { grid-template-columns: 1fr; max-height: 92vh; overflow-y: auto; }
  .lightbox-stage img { max-height: 58vh; }
  .lightbox-info { border-left: 0; border-top: 1px solid var(--line); padding: 24px; }
  .btn-copy { margin-top: 28px; }
}

@media (max-width: 640px) {
  .container { width: min(1240px, 88%); }
  .hero { padding: 118px 0 132px; }
  .hero-title { font-size: clamp(30px, 9.4vw, 40px); }
  .hero-latin { font-size: 9.5px; letter-spacing: 0.24em; }
  .hero-lede { font-size: 15px; }
  .console-text { font-size: 14px; }
  .hero-actions .btn { flex: 1 1 auto; }
  .hero-stats { gap: 28px; }
  .hero-stats strong { font-size: 25px; }
  .hero-stats li { flex: 1 1 40%; }
  .signal { gap: 14px; padding: 0 6%; height: 64px; }
  .signal-bars { width: 90px; height: 26px; }
  .signal-marquee .marquee-track { font-size: 9px; gap: 18px; }
  .section { padding: 76px 0; }
  .section-head { margin-bottom: 44px; }
  .section-head h2 { font-size: clamp(30px, 8.4vw, 40px); }
  .br-sm { display: block; }
  .engine-grid, .scene-grid { grid-template-columns: 1fr; }
  .engine-card:last-child { grid-column: auto; }
  .engine-visual { height: 300px; }
  .engine-card:last-child .engine-visual { height: 300px; }
  .flow { grid-template-columns: 1fr; gap: 34px; }
  .flow-step { padding-left: 24px; }
  .flow-step p { max-width: none; }
  .gallery { grid-template-columns: 1fr; gap: 34px; }
  .shot-a, .shot-b, .shot-c, .shot-d, .shot-e, .shot-f { grid-column: auto; margin-top: 0; }
  .shot-btn img { height: auto; aspect-ratio: 4 / 5; }
  .custom-word { font-size: clamp(76px, 26vw, 120px); }
  .marquee-brands { gap: 34px; font-size: 13.5px; }
  .mq-brand svg { width: 16px; height: 16px; }
  .custom-right { padding: 28px 24px; }
  .cta { padding: 110px 0; }
  .cta-form input, .cta-form .btn { width: 100%; }
  .footer { padding-top: 56px; }
  .footer-top { gap: 32px; margin-bottom: 40px; }
  .footer-col a { font-size: 13.5px; }
  .footer-bottom { flex-direction: column; gap: 6px; }
  .shot-btn::after { opacity: 1; transform: none; }
  .lightbox-panel { width: 92vw; }
  .lb-nav { width: 36px; height: 36px; }
}

/* 减少动态效果 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .reveal { opacity: 1; transform: none; }
  .marquee-track, .marquee-slow { animation: none; }
}