/* ==========================================================================
   广东铭康技术有限公司 官网样式
   Tech / Minimal / Futuristic
   ========================================================================== */

:root {
  --bg: #05070d;
  --bg-alt: #0a0e1a;
  --bg-card: rgba(255, 255, 255, 0.04);
  --border: rgba(255, 255, 255, 0.09);
  --text: #eaf1ff;
  --text-dim: #8994ad;
  --text-dimmer: #5c6680;
  --primary: #00e5ff;
  --primary-2: #2979ff;
  --secondary: #7c4dff;
  --gradient-brand: linear-gradient(135deg, #00e5ff 0%, #2979ff 50%, #7c4dff 100%);
  --gradient-radial: radial-gradient(circle at 50% 50%, rgba(0, 229, 255, 0.15), transparent 70%);
  --shadow-glow: 0 0 40px rgba(0, 229, 255, 0.25);
  --radius: 18px;
  --radius-sm: 10px;
  --container: 1180px;
  --header-h: 76px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }

a { color: inherit; text-decoration: none; }

ul { list-style: none; }

button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.section { position: relative; padding: 120px 0; }
.section-alt { background: var(--bg-alt); }

.section-head { text-align: center; max-width: 640px; margin: 0 auto 64px; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 16px;
}
.eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--primary);
  display: inline-block;
}

.section-head h2 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.section-head p { color: var(--text-dim); font-size: 16px; }

.gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- 背景纹理 ---------- */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 40%, transparent 100%);
}

#particles {
  position: fixed;
  inset: 0;
  z-index: -1;
  opacity: 0.55;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 30px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  transition: all 0.25s ease;
  white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; }

.btn-primary {
  background: var(--gradient-brand);
  color: #041018;
  box-shadow: 0 8px 24px rgba(0, 229, 255, 0.25);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(0, 229, 255, 0.4); }

.btn-ghost {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  color: var(--text);
  backdrop-filter: blur(6px);
}
.btn-ghost:hover { border-color: rgba(0, 229, 255, 0.5); background: rgba(0, 229, 255, 0.06); }

.btn-block { width: 100%; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  border-bottom: 1px solid transparent;
  transition: all 0.3s ease;
}
.site-header.scrolled {
  background: rgba(5, 7, 13, 0.75);
  backdrop-filter: blur(16px);
  border-bottom-color: var(--border);
}

.nav-wrap {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; letter-spacing: 0.5px; }
.brand .logo-mark {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: var(--gradient-brand);
  display: flex; align-items: center; justify-content: center;
  color: #041018;
  box-shadow: var(--shadow-glow);
}
.brand .logo-mark svg { width: 20px; height: 20px; }
.brand .name-cn { font-size: 16px; }
.brand .name-en { display: block; font-size: 10px; color: var(--text-dim); font-weight: 500; letter-spacing: 2px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}
.nav-links a {
  font-size: 14.5px;
  color: var(--text-dim);
  font-weight: 500;
  position: relative;
  padding: 6px 0;
  transition: color 0.2s;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 2px;
  background: var(--gradient-brand);
  transition: width 0.25s ease;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }

.nav-actions { display: flex; align-items: center; gap: 14px; }
.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  align-items: center; justify-content: center;
  border: 1px solid var(--border);
  border-radius: 10px;
}
.nav-toggle svg { width: 20px; height: 20px; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-h);
  overflow: hidden;
}

.hero .container {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 40px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.03);
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 28px;
}
.hero-badge .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 10px var(--primary);
  animation: pulse-dot 1.8s infinite;
}

.hero h1 {
  font-size: clamp(36px, 5vw, 60px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 24px;
}

.hero p.lead {
  font-size: 17px;
  color: var(--text-dim);
  max-width: 520px;
  margin-bottom: 36px;
}

.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 56px; }

.hero-stats {
  display: flex;
  gap: 44px;
  flex-wrap: wrap;
}
.hero-stats .stat-num {
  font-size: 30px;
  font-weight: 800;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-stats .stat-label { font-size: 13px; color: var(--text-dimmer); margin-top: 4px; }

/* Hero visual: orbiting devices */
.hero-visual {
  position: relative;
  height: 520px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.orbit-core {
  position: relative;
  width: 220px; height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, rgba(0,229,255,0.5), rgba(124,77,255,0.15) 60%, transparent 75%);
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 0 90px rgba(0, 229, 255, 0.25);
}
.orbit-core::before {
  content: "";
  position: absolute; inset: 30px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.15);
}
.orbit-core .core-icon {
  width: 84px; height: 84px;
  border-radius: 24px;
  background: var(--gradient-brand);
  display: flex; align-items: center; justify-content: center;
  color: #041018;
}
.orbit-core .core-icon svg { width: 44px; height: 44px; }

.orbit-ring {
  position: absolute;
  border: 1px dashed rgba(255, 255, 255, 0.14);
  border-radius: 50%;
  top: 50%; left: 50%;
}
.orbit-ring-1 { width: 340px; height: 340px; margin: -170px 0 0 -170px; animation: spin 22s linear infinite; }
.orbit-ring-2 { width: 460px; height: 460px; margin: -230px 0 0 -230px; animation: spin 34s linear infinite reverse; }

.orbit-node {
  position: absolute;
  width: 68px; height: 68px;
  border-radius: 18px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  backdrop-filter: blur(10px);
  display: flex; align-items: center; justify-content: center;
  color: var(--primary);
  box-shadow: 0 8px 30px rgba(0,0,0,0.35);
}
.orbit-node svg { width: 30px; height: 30px; }
.orbit-ring-1 .orbit-node { top: -34px; left: 50%; margin-left: -34px; animation: spin-rev 22s linear infinite; }
.orbit-ring-2 .orbit-node:nth-child(1) { top: 50%; left: -34px; margin-top: -34px; animation: spin-rev2 34s linear infinite; }
.orbit-ring-2 .orbit-node:nth-child(2) { bottom: -34px; left: 50%; margin-left: -34px; animation: spin-rev2 34s linear infinite; }

@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
@keyframes spin-rev { from { transform: rotate(0deg); } to { transform: rotate(-360deg); } }
@keyframes spin-rev2 { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
@keyframes pulse-dot { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }

.hero-glow {
  position: absolute;
  width: 700px; height: 700px;
  background: var(--gradient-radial);
  top: -180px; right: -220px;
  z-index: -1;
  border-radius: 50%;
}

/* ---------- 品牌信任条 ---------- */
.marquee {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 26px 0;
  overflow: hidden;
  background: rgba(255,255,255,0.02);
}
.marquee-track {
  display: flex;
  gap: 64px;
  width: max-content;
  animation: marquee 26s linear infinite;
}
.marquee-track span {
  font-size: 14px;
  letter-spacing: 2px;
  color: var(--text-dimmer);
  text-transform: uppercase;
  white-space: nowrap;
}
@keyframes marquee { from { transform: translateX(0); } to { transform: translateX(-50%); } }

/* ---------- 产品卡片 ---------- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.product-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 30px 30px;
  overflow: hidden;
  transition: transform 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}
.product-card:hover {
  transform: translateY(-8px);
  border-color: rgba(0, 229, 255, 0.35);
  box-shadow: 0 20px 50px rgba(0, 229, 255, 0.12);
}

.product-card .card-glow {
  position: absolute;
  width: 220px; height: 220px;
  border-radius: 50%;
  background: var(--gradient-radial);
  top: -80px; right: -80px;
  pointer-events: none;
}

.product-visual {
  position: relative;
  height: 200px;
  border-radius: var(--radius-sm);
  background: linear-gradient(160deg, rgba(255,255,255,0.06), rgba(255,255,255,0.01));
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 26px;
}
.product-visual .device-icon {
  width: 92px; height: 92px;
  border-radius: 26px;
  background: var(--gradient-brand);
  display: flex; align-items: center; justify-content: center;
  color: #041018;
  box-shadow: 0 12px 40px rgba(0, 229, 255, 0.3);
}
.product-visual .device-icon svg { width: 46px; height: 46px; }
.product-visual .tag {
  position: absolute;
  top: 14px; left: 14px;
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-dimmer);
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(0,0,0,0.3);
}

.product-card h3 { font-size: 21px; font-weight: 700; margin-bottom: 10px; }
.product-card p.desc { color: var(--text-dim); font-size: 14.5px; margin-bottom: 20px; }

.feature-list { display: flex; flex-direction: column; gap: 10px; margin-bottom: 24px; }
.feature-list li { display: flex; align-items: center; gap: 10px; font-size: 13.5px; color: var(--text); }
.feature-list li svg { width: 16px; height: 16px; color: var(--primary); flex-shrink: 0; }

.card-link {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 14px; font-weight: 600; color: var(--primary);
}
.card-link svg { width: 16px; height: 16px; transition: transform 0.2s; }
.card-link:hover svg { transform: translateX(4px); }

/* ---------- App 展示区 ---------- */
.app-section .container {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 60px;
  align-items: center;
}

.phone-mock {
  position: relative;
  width: 280px;
  height: 570px;
  margin: 0 auto;
  border-radius: 42px;
  background: linear-gradient(160deg, #10192c, #060911);
  border: 10px solid #0d1526;
  box-shadow: 0 40px 90px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(255,255,255,0.06);
  padding: 18px 14px;
  overflow: hidden;
}
.phone-mock::before {
  content: "";
  position: absolute;
  top: 0; left: 50%; transform: translateX(-50%);
  width: 120px; height: 22px;
  background: #0d1526;
  border-radius: 0 0 16px 16px;
  z-index: 2;
}
.phone-screen {
  position: relative;
  height: 100%;
  border-radius: 26px;
  background: var(--gradient-radial), #060a14;
  padding: 26px 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.phone-screen .ph-header { display: flex; justify-content: space-between; align-items: center; font-size: 11px; color: var(--text-dimmer); }
.phone-screen .ph-title { font-size: 15px; font-weight: 700; margin-top: 4px; }
.ph-ring {
  margin: 10px auto 4px;
  width: 148px; height: 148px;
  border-radius: 50%;
  background: conic-gradient(var(--primary) 0deg 260deg, rgba(255,255,255,0.08) 260deg 360deg);
  display: flex; align-items: center; justify-content: center;
}
.ph-ring::before {
  content: "";
  width: 118px; height: 118px;
  border-radius: 50%;
  background: #0a0f1c;
}
.ph-ring-label { position: absolute; text-align: center; }
.ph-ring-label b { display: block; font-size: 22px; }
.ph-ring-label span { font-size: 11px; color: var(--text-dimmer); }
.ph-metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.ph-metric {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px;
}
.ph-metric svg { width: 16px; height: 16px; color: var(--primary); margin-bottom: 6px; }
.ph-metric b { display: block; font-size: 16px; }
.ph-metric span { font-size: 10.5px; color: var(--text-dimmer); }

.phone-mock .glow-behind {
  position: absolute;
  width: 380px; height: 380px;
  background: var(--gradient-radial);
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  z-index: -1;
}

.app-copy .eyebrow { margin-bottom: 16px; }
.app-copy h2 { font-size: clamp(28px, 4vw, 38px); font-weight: 800; margin-bottom: 20px; line-height: 1.25; }
.app-copy p.lead { color: var(--text-dim); font-size: 16px; margin-bottom: 34px; max-width: 480px; }

.app-feature-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 36px;
}
.app-feature {
  display: flex; gap: 14px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--bg-card);
}
.app-feature .icon-box {
  width: 42px; height: 42px;
  border-radius: 12px;
  background: rgba(0, 229, 255, 0.1);
  color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.app-feature .icon-box svg { width: 22px; height: 22px; }
.app-feature h4 { font-size: 15px; font-weight: 700; margin-bottom: 4px; }
.app-feature p { font-size: 13px; color: var(--text-dim); }

.store-badges { display: flex; gap: 14px; flex-wrap: wrap; }
.store-badge {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 20px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(255,255,255,0.04);
  transition: border-color 0.2s, background 0.2s;
}
.store-badge:hover { border-color: rgba(0,229,255,0.4); background: rgba(0,229,255,0.06); }
.store-badge svg { width: 22px; height: 22px; }
.store-badge .store-text span { display: block; font-size: 10px; color: var(--text-dimmer); }
.store-badge .store-text b { font-size: 14px; }

/* ---------- 技术优势 / 数据 ---------- */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.tech-card {
  padding: 30px 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  text-align: left;
  transition: transform 0.3s, border-color 0.3s;
}
.tech-card:hover { transform: translateY(-6px); border-color: rgba(124,77,255,0.4); }
.tech-card .icon-box {
  width: 52px; height: 52px;
  border-radius: 14px;
  background: rgba(124, 77, 255, 0.12);
  color: var(--secondary);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px;
}
.tech-card .icon-box svg { width: 26px; height: 26px; }
.tech-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.tech-card p { font-size: 13.5px; color: var(--text-dim); }

/* ---------- 关于我们 ---------- */
.about-section .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.about-visual {
  position: relative;
  height: 420px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background:
    linear-gradient(160deg, rgba(0,229,255,0.08), rgba(124,77,255,0.05)),
    repeating-linear-gradient(45deg, rgba(255,255,255,0.02) 0 2px, transparent 2px 14px);
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.about-visual .badge-float {
  position: absolute;
  padding: 14px 18px;
  background: rgba(10,14,24,0.85);
  border: 1px solid var(--border);
  border-radius: 14px;
  backdrop-filter: blur(8px);
  font-size: 13px;
  display: flex; align-items: center; gap: 10px;
}
.about-visual .badge-float svg { width: 20px; height: 20px; color: var(--primary); }
.about-visual .b1 { top: 34px; left: 30px; }
.about-visual .b2 { bottom: 40px; right: 24px; }
.about-visual .center-mark {
  width: 140px; height: 140px;
  border-radius: 32px;
  background: var(--gradient-brand);
  display: flex; align-items: center; justify-content: center;
  color: #041018;
  box-shadow: 0 20px 60px rgba(0,229,255,0.3);
}
.about-visual .center-mark svg { width: 70px; height: 70px; }

.about-copy .eyebrow { margin-bottom: 16px; }
.about-copy h2 { font-size: clamp(26px, 4vw, 36px); font-weight: 800; margin-bottom: 20px; }
.about-copy p { color: var(--text-dim); margin-bottom: 18px; font-size: 15.5px; }

.about-list { margin-top: 26px; display: flex; flex-direction: column; gap: 16px; }
.about-list li { display: flex; gap: 12px; font-size: 14.5px; }
.about-list li svg { width: 20px; height: 20px; color: var(--primary); flex-shrink: 0; margin-top: 2px; }

/* ---------- 联系我们 ---------- */
.contact-section .container {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 50px;
}
.contact-info { display: flex; flex-direction: column; gap: 22px; }
.contact-info h2 { font-size: clamp(26px, 4vw, 36px); font-weight: 800; margin-bottom: 10px; }
.contact-info > p { color: var(--text-dim); margin-bottom: 10px; max-width: 420px; }
.contact-item {
  display: flex; gap: 16px; align-items: flex-start;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--bg-card);
}
.contact-item .icon-box {
  width: 42px; height: 42px; flex-shrink: 0;
  border-radius: 12px;
  background: rgba(0,229,255,0.1);
  color: var(--primary);
  display: flex; align-items: center; justify-content: center;
}
.contact-item .icon-box svg { width: 20px; height: 20px; }
.contact-item b { display: block; font-size: 14px; margin-bottom: 2px; }
.contact-item span { font-size: 13.5px; color: var(--text-dim); }

.contact-form {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  padding: 34px;
}
.contact-form h3 { font-size: 19px; font-weight: 700; margin-bottom: 22px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.form-group { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.form-group label { font-size: 13px; color: var(--text-dim); }
.form-group input, .form-group textarea, .form-group select {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus { border-color: var(--primary); }
.form-group textarea { resize: vertical; min-height: 100px; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 70px 0 30px;
  background: var(--bg-alt);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 50px;
  border-bottom: 1px solid var(--border);
}
.footer-brand .brand { margin-bottom: 16px; }
.footer-brand p { color: var(--text-dim); font-size: 14px; max-width: 320px; margin-bottom: 20px; }
.footer-social { display: flex; gap: 10px; }
.footer-social a {
  width: 38px; height: 38px;
  border: 1px solid var(--border);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-dim);
  transition: color 0.2s, border-color 0.2s;
}
.footer-social a svg { width: 18px; height: 18px; }
.footer-social a:hover { color: var(--primary); border-color: rgba(0,229,255,0.4); }

.footer-col h4 { font-size: 14px; margin-bottom: 18px; letter-spacing: 1px; text-transform: uppercase; color: var(--text-dimmer); }
.footer-col ul { display: flex; flex-direction: column; gap: 12px; }
.footer-col a { font-size: 14px; color: var(--text-dim); transition: color 0.2s; }
.footer-col a:hover { color: var(--primary); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 26px;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: var(--text-dimmer);
}
.footer-bottom a { color: var(--text-dimmer); }
.footer-bottom a:hover { color: var(--primary); }

/* ---------- 滚动出现动画 ---------- */
[data-reveal] {
  /* opacity: 0;
  transform: translateY(28px); */
  transition: opacity 0.7s ease, transform 0.7s ease;
}
[data-reveal].is-visible { opacity: 1; transform: translateY(0); }

/* ---------- 返回顶部 ---------- */
.back-to-top {
  position: fixed;
  right: 26px; bottom: 26px;
  width: 46px; height: 46px;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: #041018;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 10px 30px rgba(0,229,255,0.3);
  opacity: 0; visibility: hidden;
  transform: translateY(10px);
  transition: all 0.3s ease;
  z-index: 90;
}
.back-to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top svg { width: 20px; height: 20px; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .hero .container { grid-template-columns: 1fr; }
  .hero-visual { height: 380px; order: -1; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .app-section .container { grid-template-columns: 1fr; }
  .phone-mock { order: -1; }
  .about-section .container { grid-template-columns: 1fr; }
  .contact-section .container { grid-template-columns: 1fr; }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-links { position: fixed; top: var(--header-h); left: 0; right: 0; bottom: 0;
    background: rgba(5,7,13,0.98); backdrop-filter: blur(16px);
    flex-direction: column; align-items: flex-start; padding: 32px 24px; gap: 24px;
    transform: translateX(-100%); transition: transform 0.3s ease; }
  .nav-links.open { transform: translateX(0); }
  .nav-toggle { display: flex; }
  .nav-actions .btn-ghost { display: none; }
  .section { padding: 80px 0; }
  .product-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 28px; }
  .app-feature-grid { grid-template-columns: 1fr; }
}