:root {
  --bg: #030712;
  --bg-elevated: rgba(255, 255, 255, 0.035);
  --bg-card: rgba(15, 23, 42, 0.55);
  --text: #f8fafc;
  --text-bright: #ffffff;
  --text-muted: #94a3b8;
  --text-soft: #cbd5e1;
  --accent-cyan: #22d3ee;
  --accent-blue: #38bdf8;
  --accent-indigo: #818cf8;
  --accent-purple: #a78bfa;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(56, 189, 248, 0.28);
  --glow-cyan: rgba(34, 211, 238, 0.18);
  --glow-blue: rgba(56, 189, 248, 0.14);
  --shadow-lg: 0 32px 80px rgba(0, 0, 0, 0.38);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at 0% 0%, rgba(56, 189, 248, 0.07) 0%, transparent 32%),
    radial-gradient(circle at 100% 0%, rgba(129, 140, 248, 0.05) 0%, transparent 28%),
    radial-gradient(circle at 50% 100%, rgba(34, 211, 238, 0.04) 0%, transparent 38%),
    var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ── 导航 ── */
.top-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 48px; height: 68px;
  background: rgba(6, 13, 24, 0.82) !important;
  backdrop-filter: blur(20px) saturate(1.5);
  border-bottom: 1px solid var(--border) !important;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.22);
  transition: background .3s, border-color .3s;
}
.nav-brand {
  display: flex; align-items: center; gap: 12px;
  font-size: 20px; font-weight: 800; letter-spacing: 2px;
  text-decoration: none;
  color: var(--text-bright) !important;
}
.nav-logo {
  width: 36px; height: 36px; flex-shrink: 0;
  animation: logoPulse 4s ease-in-out infinite;
  transition: transform .35s ease;
  filter: drop-shadow(0 0 6px rgba(56, 189, 248, 0.25));
}
@keyframes logoPulse {
  0%, 100% { filter: drop-shadow(0 0 4px rgba(34, 211, 238, 0.2)); }
  50% { filter: drop-shadow(0 0 10px rgba(56, 189, 248, 0.45)); }
}
.nav-brand:hover .nav-logo {
  filter: drop-shadow(0 0 14px rgba(56, 189, 248, 0.6));
  transform: scale(1.06);
}
.nav-links {
  display: flex; align-items: center; gap: 36px; list-style: none;
}
.nav-links li { position: relative; }
.nav-links a,
.nav-trigger {
  color: var(--text-muted) !important; text-decoration: none; font-size: 14px;
  font-weight: 600; letter-spacing: .5px; transition: color .25s; position: relative;
}
.nav-links a::after {
  content: ""; position: absolute; bottom: -6px; left: 0;
  width: 0; height: 2px; border-radius: 2px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
  transition: width .3s;
}
.nav-links a:hover,
.nav-links a.active,
.nav-trigger:hover {
  color: var(--text-bright) !important;
}
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }
.nav-dropdown { padding: 22px 0; }
.nav-trigger {
  display: inline-flex; align-items: center; gap: 6px;
  border: 0; background: transparent; cursor: pointer;
}
.nav-trigger .nav-caret {
  width: 6px; height: 6px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: translateY(-2px) rotate(45deg);
  opacity: .7;
  transition: transform .22s ease, opacity .22s ease;
}
.nav-dropdown:hover .nav-caret,
.nav-dropdown:focus-within .nav-caret {
  transform: translateY(1px) rotate(225deg);
  opacity: 1;
}
.nav-dropdown-menu {
  position: absolute; top: 100%; left: 50%;
  min-width: 230px;
  padding: 8px;
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  background: rgba(8, 18, 32, 0.96) !important;
  backdrop-filter: blur(20px) saturate(1.3);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 8px);
  transition: opacity .2s ease, transform .2s ease;
}
.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown:focus-within .nav-dropdown-menu {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, 0);
}
.nav-dropdown-menu a {
  display: flex; flex-direction: column; gap: 3px;
  padding: 10px 12px;
  border-radius: 8px;
  white-space: nowrap;
  color: var(--text-soft) !important;
  letter-spacing: 0;
}
.nav-dropdown-menu a::after { display: none; }
.nav-dropdown-menu a:hover,
.nav-dropdown-menu a:focus {
  color: var(--text-bright) !important;
  background: rgba(56, 189, 248, 0.12) !important;
  outline: none;
}
.nav-login {
  padding: 8px 20px; border-radius: 10px;
  border: 1px solid var(--border-strong) !important;
  background: rgba(56, 189, 248, 0.1) !important;
  color: var(--accent-blue) !important; font-size: 13px; font-weight: 700;
  text-decoration: none; letter-spacing: .5px; transition: all .25s;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}
.nav-login:hover {
  background: rgba(56, 189, 248, 0.2) !important;
  border-color: rgba(103, 232, 249, 0.65) !important;
  box-shadow: 0 0 24px rgba(56, 189, 248, 0.18), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}
/* ── 轮播 ── */
.hero-slider {
  position: relative; width: 100%; height: 100vh; min-height: 600px; overflow: hidden;
  background:
    radial-gradient(circle at 72% 48%, rgba(56, 189, 248, 0.10), transparent 32rem),
    radial-gradient(circle at 18% 18%, rgba(129, 140, 248, 0.06), transparent 26rem),
    linear-gradient(135deg, #050914 0%, #0a1527 55%, #0d1f38 100%);
}
.slide {
  position: absolute; inset: 0; opacity: 0;
  transition: opacity 1.2s ease-in-out;
  display: flex; justify-content: center; align-items: center;
}
.slide.active { opacity: 1; }

.slide-bg { position: absolute; inset: 0; z-index: 0; background: transparent !important; }
.slide-orb {
  position: absolute; border-radius: 50%;
  filter: blur(90px); opacity: .28;
  animation: orbDrift 16s ease-in-out infinite;
  pointer-events: none;
}
@keyframes orbDrift {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(24px, -18px); }
}

.slide-content {
  position: relative; z-index: 1;
  display: flex; flex-direction: column;
  align-items: center; text-align: center;
  padding: 0 24px 40px 24px;
}

.slide-lead {
  width: 1px; height: 56px;
  background: linear-gradient(180deg, transparent, var(--accent-blue), var(--accent-cyan));
  margin-bottom: 28px;
  opacity: 0; transform: scaleY(0); transform-origin: top;
  transition: all .8s cubic-bezier(0.23, 1, 0.32, 1) .1s;
}
.slide.active .slide-lead { opacity: 1; transform: scaleY(1); }

.slide-label {
  font-size: 11px; font-weight: 700;
  letter-spacing: 6px;
  color: var(--accent-blue) !important;
  margin-bottom: 36px;
  opacity: 0; transform: translateY(10px);
  transition: all .7s .25s;
}
.slide.active .slide-label { opacity: 1; transform: translateY(0); }

.slide-char-group { position: relative; margin-bottom: 48px; }
.slide-char {
  position: relative;
  font-size: clamp(90px, 18vw, 260px);
  font-weight: 900; line-height: 1;
  letter-spacing: clamp(8px, 2.5vw, 28px);
  background: linear-gradient(180deg, #ffffff 0%, #e2e8f0 45%, #7dd3fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  opacity: 0; transform: translateY(30px);
  transition: all 1s cubic-bezier(0.23, 1, 0.32, 1) .3s;
  filter: drop-shadow(0 24px 70px rgba(56, 189, 248, 0.18));
}
.slide.active .slide-char { opacity: 1; transform: translateY(0); }

.slide-sep {
  width: 48px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-blue), transparent);
  margin-bottom: 40px;
  opacity: 0; transition: all .6s .6s;
}
.slide.active .slide-sep { opacity: .6; }

.slide-claim {
  font-size: clamp(18px, 2.4vw, 24px);
  font-weight: 400;
  letter-spacing: 3px;
  line-height: 1.6;
  color: var(--text) !important;
  margin-bottom: 24px;
  opacity: 0; transform: translateY(12px);
  transition: all .7s .7s;
}
.slide.active .slide-claim { opacity: 1; transform: translateY(0); }
.slide-claim em {
  font-style: normal;
  font-weight: 700;
  color: var(--accent-cyan) !important;
  position: relative;
}

.slide-reveal {
  display: flex; flex-direction: column; gap: 6px;
  align-items: center;
  opacity: 0; transform: translateY(10px);
  transition: all .7s .9s;
}
.slide.active .slide-reveal { opacity: 1; transform: translateY(0); }

.reveal-line {
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 1.5px;
  line-height: 2;
  color: var(--text-muted) !important;
  display: flex; align-items: center; gap: 10px;
}
.reveal-line strong {
  font-weight: 600;
  color: var(--text-soft) !important;
}
.reveal-dot {
  width: 3px; height: 3px;
  border-radius: 50%;
  background: var(--accent-blue);
  opacity: .5;
  flex-shrink: 0;
}

.slider-dots {
  position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%); z-index: 2;
  display: flex; gap: 14px;
}
.slider-dots button {
  width: 40px; height: 3px; border-radius: 2px; border: none; cursor: pointer;
  background: rgba(255, 255, 255, 0.08); transition: all .4s;
}
.slider-dots button.active {
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan)) !important;
  width: 64px;
}
.slider-dots button:hover {
  background: rgba(255, 255, 255, 0.18);
}
/* ── 理念 ── */
.philosophy {
  padding: 130px 24px 100px; text-align: center;
  background: transparent !important;
  position: relative; overflow: hidden;
}
.section-label {
  font-size: 12px; font-weight: 700; letter-spacing: 4px;
  color: var(--accent-blue) !important;
  margin-bottom: 24px; text-transform: uppercase;
}
/* section-label 装饰细线 */
.philosophy .section-label {
  display: flex; align-items: center; justify-content: center; gap: 16px;
}
.philosophy .section-label::before,
.philosophy .section-label::after {
  content: ""; width: 46px; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(56, 189, 248, 0.45));
}
.philosophy .section-label::after {
  background: linear-gradient(90deg, rgba(56, 189, 248, 0.45), transparent);
}
.product-cta-text .section-label {
  display: flex; align-items: center; gap: 10px;
}
.product-cta-text .section-label::before {
  content: ""; width: 28px; height: 1px;
  background: linear-gradient(90deg, var(--accent-blue), transparent);
}
.philosophy h2 {
  font-size: clamp(28px, 4vw, 48px); font-weight: 300; letter-spacing: 4px; margin-bottom: 24px;
  color: var(--text-bright) !important;
}
.philosophy h2 strong {
  font-weight: 800; color: var(--text-bright) !important;
}
.philosophy-desc {
  max-width: 680px; margin: 0 auto; color: var(--text-muted) !important; font-size: 16px; line-height: 2.2;
}
.concept-cards {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px;
  max-width: 1100px; margin: 72px auto 0;
}
.concept-card {
  padding: 56px 36px 48px; border-radius: 24px; text-align: center;
  border: 1px solid var(--border) !important;
  background: var(--bg-card) !important;
  backdrop-filter: blur(24px) saturate(1.3);
  transition: all .5s cubic-bezier(0.23, 1, 0.32, 1);
  position: relative; overflow: hidden;
  display: flex; flex-direction: column; justify-content: flex-start; align-items: center;
  min-height: 360px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.28), inset 0 1px 0 rgba(255, 255, 255, 0.06);
}
/* 顶部渐变光束：常显，hover 增强 */
.concept-card::before {
  content: ""; position: absolute; top: 0; left: 50%; transform: translateX(-50%);
  width: 46%; height: 2px; border-radius: 0 0 4px 4px;
  background: linear-gradient(90deg, transparent, var(--accent-blue), var(--accent-cyan), transparent);
  filter: drop-shadow(0 0 8px rgba(56, 189, 248, 0.45));
  opacity: .38; transition: all .6s ease;
}
.concept-card:hover::before { opacity: .95; width: 76%; }
/* hover 光晕 */
.concept-card::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(60% 42% at 50% 0%, rgba(56, 189, 248, 0.09), transparent 70%);
  opacity: 0; transition: opacity .5s ease;
}
.concept-card:hover::after { opacity: 1; }
.concept-card:hover {
  border-color: var(--border-strong) !important;
  transform: translateY(-8px);
  box-shadow: 0 40px 90px rgba(0, 0, 0, 0.35), 0 0 44px -12px rgba(56, 189, 248, 0.28), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}
.card-icon {
  width: 56px; height: 56px; margin: 4px auto 24px;
  border-radius: 16px; display: grid; place-items: center;
  background: linear-gradient(150deg, rgba(56, 189, 248, 0.18), rgba(34, 211, 238, 0.05));
  border: 1px solid rgba(56, 189, 248, 0.26);
  box-shadow: inset 0 0 18px rgba(56, 189, 248, 0.10), 0 8px 22px -8px rgba(56, 189, 248, 0.30);
  transition: all .5s cubic-bezier(0.23, 1, 0.32, 1);
}
.card-icon svg {
  width: 26px; height: 26px; stroke: var(--accent-blue); fill: none;
  stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round;
  filter: drop-shadow(0 2px 8px rgba(56, 189, 248, 0.35));
  transition: all .5s;
}
.concept-card:hover .card-icon {
  transform: translateY(-4px) scale(1.05);
  border-color: rgba(103, 232, 249, 0.55);
  box-shadow: inset 0 0 22px rgba(56, 189, 248, 0.16), 0 12px 30px -8px rgba(56, 189, 248, 0.45);
}
.concept-card:hover .card-icon svg { stroke: var(--accent-cyan); }
.card-label {
  font-size: 11px; font-weight: 600; letter-spacing: 4px;
  color: var(--accent-blue) !important; text-transform: uppercase;
  margin-bottom: 14px;
}
.concept-card h3 {
  font-size: 22px; font-weight: 300; margin-bottom: 30px; letter-spacing: 4px;
  color: var(--accent-cyan) !important;
  text-shadow: 0 0 20px rgba(34, 211, 238, 0.25);
}
.concept-card h3 strong {
  font-weight: 800;
  color: var(--accent-cyan) !important;
}
.concept-card p {
  color: var(--text-muted) !important; font-size: 14px; line-height: 2.0; font-weight: 400;
  text-align: left; text-indent: 2em;
}

/* ── 产品入口 ── */
.product-cta {
  padding: 110px 24px 140px; position: relative; overflow: hidden;
  background: transparent !important;
}
.product-cta .orb {
  position: absolute; border-radius: 50%;
  filter: blur(60px); opacity: .25;
  animation: orbDrift 14s ease-in-out infinite;
  pointer-events: none;
}
.product-cta-inner {
  position: relative; z-index: 1; max-width: 1100px; margin: 0 auto;
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: stretch;
}
.product-cta-text {
  display: flex; flex-direction: column; justify-content: flex-start;
  padding: 0;
  position: relative;
}
.product-cta-text .section-label {
  position: absolute;
  top: -22px;
  left: 0;
}
.product-cta-text h2 {
  font-size: clamp(26px, 3.6vw, 40px); font-weight: 300; letter-spacing: 4px; margin-bottom: 20px;
  color: var(--text-bright) !important;
}
.product-cta-text h2 strong {
  font-weight: 800; color: var(--text-bright) !important;
}
.product-cta-text h2 strong.text-blue-glow {
  color: var(--accent-blue) !important;
  text-shadow: 0 0 24px rgba(56, 189, 248, 0.35), 0 0 48px rgba(56, 189, 248, 0.12);
}
.product-desc { margin: 30px 0 36px; display: flex; flex-direction: column; }
.desc-line {
  display: flex; align-items: center; gap: 16px;
  padding: 13px 12px; border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: 12px;
  transition: all .35s ease;
}
.desc-line:last-child { border-bottom: none; }
.desc-line:hover {
  border-color: rgba(56, 189, 248, 0.14);
  background: rgba(56, 189, 248, 0.04);
  padding-left: 16px;
}
/* 特性行图标 */
.desc-icon {
  flex: none; width: 36px; height: 36px; border-radius: 11px;
  display: grid; place-items: center;
  background: linear-gradient(150deg, rgba(56, 189, 248, 0.16), rgba(34, 211, 238, 0.06));
  border: 1px solid rgba(56, 189, 248, 0.22);
  box-shadow: inset 0 0 12px rgba(56, 189, 248, 0.08);
  transition: all .35s ease;
}
.desc-icon svg {
  width: 18px; height: 18px; stroke: var(--accent-blue); fill: none;
  stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round;
}
.desc-line:hover .desc-icon {
  border-color: rgba(103, 232, 249, 0.5);
  box-shadow: inset 0 0 14px rgba(56, 189, 248, 0.14), 0 0 16px -2px rgba(56, 189, 248, 0.3);
}
.desc-kw {
  font-size: 14px; font-weight: 600; letter-spacing: 3px;
  color: var(--accent-cyan) !important;
  min-width: 80px; flex-shrink: 0;
}
.desc-text { color: var(--text-muted) !important; font-size: 14px; line-height: 1.8; }
.cta-buttons { display: flex; gap: 20px; flex-wrap: wrap; margin-top: auto; }
.cta-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 30px; border-radius: 999px; font-size: 12.5px; font-weight: 500;
  text-decoration: none; letter-spacing: 2.5px;
  transition: all .45s cubic-bezier(0.23, 1, 0.32, 1);
  position: relative; overflow: hidden; cursor: pointer;
}
.cta-btn.primary {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.9), rgba(34, 211, 238, 0.85)) !important;
  border: 1px solid rgba(125, 211, 252, 0.5) !important;
  color: #020617 !important; backdrop-filter: blur(12px);
  box-shadow: 0 4px 20px rgba(34, 211, 238, 0.25), inset 0 1px 0 rgba(255,255,255,0.35);
}
.cta-btn.primary:hover {
  background: linear-gradient(135deg, rgba(56, 189, 248, 1), rgba(34, 211, 238, 1)) !important;
  border-color: rgba(165, 243, 252, 0.75) !important;
  box-shadow: 0 8px 32px rgba(34, 211, 238, 0.35), inset 0 1px 0 rgba(255,255,255,0.45);
  transform: translateY(-2px);
}
.cta-btn.secondary {
  background: rgba(255, 255, 255, 0.03) !important;
  border: 1px solid rgba(255, 255, 255, 0.1) !important;
  color: var(--text-soft) !important;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.03);
}
.cta-btn.secondary:hover {
  border-color: var(--border-strong) !important;
  color: var(--text-bright) !important;
  background: rgba(56, 189, 248, 0.06) !important;
  transform: translateY(-2px);
}
/* ── 产品截图：浏览器窗口框 + 透视 + 悬浮角标 ── */
.product-visual {
  position: relative; height: 100%;
  display: flex; align-items: center;
  perspective: 1200px;
}
.product-visual::before {
  content: ""; position: absolute; left: 10%; right: 10%; bottom: -26px; height: 64px;
  background: radial-gradient(ellipse at center, rgba(56, 189, 248, 0.32), transparent 70%);
  filter: blur(26px); pointer-events: none;
}
.browser-frame {
  position: relative; width: 100%;
  border-radius: 16px; overflow: hidden;
  border: 1px solid var(--border-strong);
  background: #0b1526;
  box-shadow:
    0 44px 100px rgba(0, 0, 0, 0.5),
    inset 0 1px 0 rgba(255, 255, 255, 0.06),
    0 0 64px -18px rgba(56, 189, 248, 0.35);
  transform: rotateY(-7deg) rotateX(2deg);
  transform-style: preserve-3d;
  transition: transform .7s cubic-bezier(0.23, 1, 0.32, 1), box-shadow .7s ease;
}
.product-visual:hover .browser-frame {
  transform: rotateY(0deg) rotateX(0deg);
  box-shadow:
    0 52px 120px rgba(0, 0, 0, 0.55),
    inset 0 1px 0 rgba(255, 255, 255, 0.08),
    0 0 84px -14px rgba(56, 189, 248, 0.45);
}
.browser-bar {
  display: flex; align-items: center; gap: 7px;
  padding: 10px 14px;
  background: linear-gradient(180deg, rgba(30, 41, 59, 0.92), rgba(15, 23, 42, 0.92));
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.browser-dot { width: 10px; height: 10px; border-radius: 50%; flex: none; }
.browser-dot:nth-child(1) { background: #ff5f57; }
.browser-dot:nth-child(2) { background: #febc2e; }
.browser-dot:nth-child(3) { background: #28c840; }
.browser-title {
  flex: 1; margin: 0 12px; padding: 3px 12px;
  border-radius: 7px; background: rgba(2, 6, 23, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 11px; letter-spacing: 1px; color: var(--text-muted);
  text-align: center; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.browser-body img {
  width: 100%; display: block;
  transition: transform .8s cubic-bezier(0.23, 1, 0.32, 1);
}
.product-visual:hover .browser-body img { transform: scale(1.02); }
.visual-badge {
  position: absolute; top: -18px; right: -8px; z-index: 3;
  display: inline-flex; align-items: center; gap: 7px;
  padding: 9px 15px; border-radius: 999px;
  background: linear-gradient(135deg, rgba(23, 31, 55, 0.94), rgba(12, 17, 33, 0.96));
  border: 1px solid rgba(52, 211, 153, 0.38);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.45), 0 0 26px -6px rgba(16, 185, 129, 0.4);
  color: #6ee7b7; font-size: 12px; font-weight: 700; letter-spacing: 1px;
  animation: badgeFloat 4.5s ease-in-out infinite;
}
.visual-badge svg {
  width: 14px; height: 14px; stroke: currentColor; fill: none;
  stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}
@keyframes badgeFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

/* ── 区块分隔渐变线 ── */
.section-divider {
  width: min(880px, 70%); height: 1px; margin: 0 auto;
  background: linear-gradient(90deg, transparent, rgba(56, 189, 248, 0.35), rgba(34, 211, 238, 0.3), transparent);
  box-shadow: 0 0 14px rgba(56, 189, 248, 0.18);
}

/* ── 返回顶部 ── */
.back-to-top {
  position: fixed; right: 28px; bottom: 28px; z-index: 1500;
  width: 46px; height: 46px; border-radius: 14px; cursor: pointer;
  display: grid; place-items: center;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.16), rgba(34, 211, 238, 0.08));
  border: 1px solid var(--border-strong);
  color: var(--accent-blue);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(12px);
  opacity: 0; pointer-events: none; transform: translateY(12px);
  transition: all .35s ease;
}
.back-to-top.show { opacity: 1; pointer-events: auto; transform: translateY(0); }
.back-to-top:hover {
  transform: translateY(-3px);
  border-color: rgba(103, 232, 249, 0.6);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.4), 0 0 24px rgba(56, 189, 248, 0.25);
}
.back-to-top svg {
  width: 20px; height: 20px; stroke: currentColor; fill: none;
  stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}
/* ── 滚动渐入动画 ── */
.reveal-on-scroll {
  opacity: 0; transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.23, 1, 0.32, 1), 
              transform 0.8s cubic-bezier(0.23, 1, 0.32, 1);
}
.reveal-on-scroll.revealed {
  opacity: 1; transform: translateY(0);
}
.reveal-on-scroll.delay-1 { transition-delay: 0.1s; }
.reveal-on-scroll.delay-2 { transition-delay: 0.2s; }
.reveal-on-scroll.delay-3 { transition-delay: 0.3s; }
.reveal-on-scroll.delay-4 { transition-delay: 0.4s; }

/* ── 按钮涟漪效果 ── */
.cta-btn::after {
  content: ""; position: absolute; top: 50%; left: 50%;
  width: 0; height: 0; border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.6s ease, height 0.6s ease, opacity 0.6s ease;
  opacity: 0;
}
.cta-btn:active::after {
  width: 300px; height: 300px; opacity: 0;
}

/* ── 页脚 ── */
.site-footer {
  padding: 28px 24px;
  border-top: 1px solid var(--border) !important;
  text-align: center;
  background: var(--record-footer-bg, #030712) !important;
}
.site-footer p {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: nowrap;
  color: var(--record-footer-color, #030712) !important;
  font-size: 12px;
  letter-spacing: 0.5px;
  margin: 0;
  max-width: 100%;
  overflow-x: auto;
  white-space: nowrap;
}
.site-footer a { color: inherit !important; text-decoration: none; }
.site-footer a:hover { color: inherit !important; opacity: 0.8; }
.gongan-record {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: inherit;
  text-decoration: none;
  font-size: inherit;
  flex: 0 0 auto;
  white-space: nowrap;
}
.gongan-record img {
  width: 14px;
  height: 14px;
  display: inline-block;
  flex: 0 0 auto;
  object-fit: contain;
  vertical-align: -2px;
  opacity: 1;
}
.gongan-record .gongan-badge {
  width: 14px;
  height: 14px;
  display: inline-block;
  flex: 0 0 auto;
  vertical-align: -2px;
  background-color: var(--badge-color, currentColor);
  -webkit-mask: url("/static/gongan.png") no-repeat center / contain;
  mask: url("/static/gongan.png") no-repeat center / contain;
}

/* ── 响应式 ── */
@media (max-width: 900px) {
  .top-nav { padding: 0 20px; }
  .nav-links { gap: 20px; }
  .nav-links a { font-size: 13px; }
  .concept-cards { grid-template-columns: 1fr; max-width: 480px; }
  .product-cta-inner { grid-template-columns: 1fr; text-align: center; gap: 48px; align-items: center; }
  .product-visual { max-width: 520px; margin: 0 auto; height: auto; perspective: none; }
  .browser-frame { transform: none; }
  .visual-badge { right: 6px; }
  .desc-line { text-align: left; }
  .product-cta-text { padding: 0; }
  .product-cta-text .section-label { position: static; justify-content: center; }
  .product-cta-text .section-label::after {
    content: ""; width: 28px; height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent-blue));
  }
  .cta-buttons { margin-top: 0; justify-content: center; }
}
@media (max-width: 640px) {
  .top-nav { padding: 0 12px; }
  .nav-brand { font-size: 18px; gap: 8px; }
  .nav-logo { width: 30px; height: 30px; }
  .nav-links { gap: 10px; }
  .nav-links a { font-size: 12px; }
  .nav-dropdown { padding: 21px 0; }
  .nav-login { padding: 7px 10px; font-size: 12px; }
  .nav-dropdown-menu {
    left: 50%; right: auto;
    min-width: min(230px, calc(100vw - 24px));
    transform: translate(-50%, 8px);
  }
  .nav-dropdown:hover .nav-dropdown-menu,
  .nav-dropdown:focus-within .nav-dropdown-menu {
    transform: translate(-50%, 0);
  }
  .slide-char { font-size: clamp(60px, 20vw, 140px); letter-spacing: 2px; }
  .slide-lead { height: 36px; margin-bottom: 20px; }
  .slide-label { margin-bottom: 24px; }
  .slide-char-group { margin-bottom: 32px; }
  .slide-claim { font-size: 16px; letter-spacing: 1.5px; margin-bottom: 18px; }
  .reveal-line { font-size: 12px; }
  .slide-content { padding-bottom: 24px; }
  .back-to-top { right: 18px; bottom: 18px; width: 42px; height: 42px; }
  .site-footer p { font-size: 11px; gap: 6px; }
}

body.home-page {
  --bg: #020617;
  background: #020617 !important;
}

body.home-page .hero-slider,
body.home-page .philosophy,
body.home-page .product-cta,
body.home-page .site-footer {
  background: #020617 !important;
}

body.home-page .slide-orb,
body.home-page .product-cta .orb {
  display: none !important;
}

/* ── 矮视口：压缩轮播内容，避免文案与底部指示条重叠 ── */
@media (max-height: 760px) and (min-width: 641px) {
  .slide-lead { height: 36px; margin-bottom: 18px; }
  .slide-label { margin-bottom: 24px; }
  .slide-char-group { margin-bottom: 32px; }
  .slide-char { font-size: clamp(72px, 34vh, 220px); }
  .slide-sep { margin-bottom: 24px; }
  .slide-claim { margin-bottom: 16px; }
  .slide-reveal { gap: 4px; }
  .reveal-line { line-height: 1.8; }
  .slide-content { padding-bottom: 32px; }
  .slider-dots { bottom: 16px; }
}