/* ==========================================================================
   LUMI AGENT — 官方网站设计系统
   设计语言: 暗色科技 · 品牌渐变(翡翠绿→深青) · 精密网格 · 克制辉光
   参考: Linear/Cursor/ElevenLabs 的暗色 AI 产品风, 保留品牌原创性
   ========================================================================== */

:root {
  /* ---- 色彩 ---- */
  --bg: #05070a;            /* 页面底色 */
  --bg-soft: #0a0e14;       /* 次级底色 */
  --surface: #0e141c;       /* 卡片表面 */
  --surface-2: #111a24;     /* 卡片悬浮 */
  --border: rgba(148, 178, 196, 0.12);
  --border-strong: rgba(45, 212, 191, 0.25);
  --text: #e8edf2;
  --text-dim: #8a94a6;
  --text-faint: #5b6675;
  --accent: #2dd4bf;        /* Lumi 翡翠绿 */
  --accent-2: #03b8df;      /* 深青 */
  --accent-grad: linear-gradient(120deg, #2dd4bf 0%, #03b8df 100%);
  --accent-soft: rgba(45, 212, 191, 0.10);
  --gold: #f1b000;
  --danger: #ea545d;
  --ok: #2dd4bf;

  /* ---- 字体 ---- */
  --font-cn: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC", sans-serif;
  --font-en: "Space Grotesk", "Inter", "SF Pro Display", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "JetBrains Mono", "Cascadia Code", "SF Mono", Consolas, monospace;

  /* ---- 布局 ---- */
  --radius: 16px;
  --radius-lg: 24px;
  --radius-sm: 10px;
  --container: 1180px;
  --nav-h: 68px;

  /* ---- 阴影/辉光 ---- */
  --shadow-card: 0 1px 0 rgba(255,255,255,0.04) inset, 0 12px 40px rgba(0,0,0,0.45);
  --glow-accent: 0 0 0 1px rgba(45,212,191,0.15), 0 8px 60px rgba(45,212,191,0.12), 0 0 120px rgba(3,184,223,0.08);
}

/* ==========================================================================
   基础重置
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 12px); }

body {
  font-family: var(--font-cn);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
ul { list-style: none; }

::selection { background: rgba(45,212,191,0.28); color: #fff; }

/* 滚动条 */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: #1c2632; border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: #2a3849; }

/* 数字用英文几何字体 */
.num, .price, .stat-val, .version { font-family: var(--font-en); letter-spacing: -0.01em; }

/* ==========================================================================
   背景装饰: 网格 + 光晕 + 噪声
   ========================================================================== */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(rgba(148,178,196,0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148,178,196,0.045) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, black 30%, transparent 75%);
}

.bg-glow {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(ellipse 55% 35% at 50% -5%, rgba(45,212,191,0.10), transparent 65%),
    radial-gradient(ellipse 40% 30% at 88% 30%, rgba(3,184,223,0.06), transparent 60%);
}

/* ==========================================================================
   容器 / 排版
   ========================================================================== */
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

.section { position: relative; padding: 110px 0; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-en);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 18px;
}
.eyebrow::before {
  content: "";
  width: 22px; height: 1px;
  background: var(--accent-grad);
}

.section-title {
  font-size: clamp(30px, 4.2vw, 46px);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin-bottom: 18px;
}
.section-title .grad {
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.section-sub {
  color: var(--text-dim);
  font-size: 17px;
  max-width: 640px;
  line-height: 1.75;
}
.center { text-align: center; }
.center .section-sub { margin: 0 auto 48px; }
.center .eyebrow::before { display: none; }
.center .eyebrow { justify-content: center; }

/* ==========================================================================
   导航
   ========================================================================== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  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, 7, 10, 0.82);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom-color: var(--border);
}
.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 19px; letter-spacing: 0.02em; }
.brand .logo {
  width: 30px; height: 30px;
  border-radius: 9px;
  background: var(--accent-grad);
  display: grid; place-items: center;
  box-shadow: 0 4px 18px rgba(45,212,191,0.35);
}
.brand .logo svg { width: 18px; height: 18px; }
/* v4.5.0 品牌 logo：机器人徽章（去掉渐变底，直接显示徽章图） */
.brand .logo-robot { background: none; box-shadow: none; width: 40px; height: 40px; }
.brand .logo-robot img { width: 40px; height: 40px; border-radius: 10px; object-fit: cover; display: block; }
.brand small { color: var(--text-dim); font-weight: 500; font-size: 12px; margin-left: 2px; }

.nav-links { display: flex; align-items: center; gap: 20px; }
.nav-links a {
  font-size: 13.5px;
  color: var(--text-dim);
  transition: color 0.2s;
  position: relative;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -4px;
  width: 0; height: 1.5px;
  background: var(--accent-grad);
  transition: width 0.25s ease;
}
.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after { width: 100%; }

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: var(--accent-grad);
  color: #03110e !important;
  font-weight: 600;
  font-size: 14px;
  padding: 9px 18px;
  border-radius: 10px;
  transition: transform 0.2s, box-shadow 0.2s, filter 0.2s;
  box-shadow: 0 4px 20px rgba(45,212,191,0.28);
}
.nav-cta:hover { transform: translateY(-1px); filter: brightness(1.08); box-shadow: 0 6px 28px rgba(45,212,191,0.4); }
.nav-cta::after { display: none; }

.nav-burger { display: none; background: none; border: 0; color: var(--text); padding: 8px; }

/* ==========================================================================
   按钮
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  font-size: 15.5px;
  font-weight: 600;
  padding: 14px 28px;
  border-radius: 12px;
  border: 1px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s;
  white-space: nowrap;
}
.btn svg { width: 17px; height: 17px; }
.btn-primary {
  background: var(--accent-grad);
  color: #03110e;
  box-shadow: 0 6px 30px rgba(45,212,191,0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 40px rgba(45,212,191,0.42); }
.btn-ghost {
  background: rgba(255,255,255,0.03);
  color: var(--text);
  border-color: var(--border);
  backdrop-filter: blur(6px);
}
.btn-ghost:hover { border-color: rgba(45,212,191,0.4); background: rgba(45,212,191,0.06); transform: translateY(-2px); }
.btn-lg { padding: 16px 34px; font-size: 16.5px; }

/* ==========================================================================
   HERO
   ========================================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-h) + 48px) 0 60px;
  overflow: hidden;
}

.hero-bg-ring {
  position: absolute;
  width: 640px; height: 640px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(45,212,191,0.14) 0%, rgba(3,184,223,0.05) 40%, transparent 70%);
  top: -120px; right: -80px;
  animation: ringPulse 7s ease-in-out infinite;
  pointer-events: none;
}
@keyframes ringPulse {
  0%, 100% { transform: scale(1); opacity: 0.85; }
  50% { transform: scale(1.12); opacity: 1; }
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 60px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--border-strong);
  padding: 7px 15px;
  border-radius: 999px;
  margin-bottom: 26px;
  font-family: var(--font-en);
  letter-spacing: 0.02em;
}
.hero-badge .dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 rgba(45,212,191,0.5);
  animation: dotPulse 2s infinite;
}
@keyframes dotPulse {
  0% { box-shadow: 0 0 0 0 rgba(45,212,191,0.45); }
  70% { box-shadow: 0 0 0 9px rgba(45,212,191,0); }
  100% { box-shadow: 0 0 0 0 rgba(45,212,191,0); }
}

.hero-title {
  font-size: clamp(42px, 6vw, 72px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}
.hero-title .grad {
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-sub {
  font-size: clamp(16px, 1.6vw, 19px);
  color: var(--text-dim);
  line-height: 1.8;
  max-width: 540px;
  margin-bottom: 38px;
}
.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; }

.hero-trust {
  display: flex;
  align-items: center;
  gap: 22px;
  margin-top: 44px;
  color: var(--text-faint);
  font-size: 13px;
}
.hero-trust .t-item { display: flex; align-items: center; gap: 7px; }
.hero-trust svg { width: 15px; height: 15px; color: var(--accent); }

/* ---- Hero 手机 mockup ---- */
.hero-visual { position: relative; display: flex; justify-content: center; }

.phone {
  position: relative;
  width: 296px;
  height: 612px;
  border-radius: 44px;
  background: linear-gradient(160deg, #1a2430 0%, #0c1119 100%);
  border: 1px solid rgba(148,178,196,0.22);
  box-shadow: 0 40px 90px rgba(0,0,0,0.6), 0 0 0 1px rgba(255,255,255,0.03) inset, 0 0 90px rgba(45,212,191,0.07);
  padding: 11px;
}
.phone-screen {
  width: 100%;
  height: 100%;
  border-radius: 34px;
  overflow: hidden;
  background: #000;
  position: relative;
}
.phone-notch {
  position: absolute;
  top: 10px; left: 50%;
  transform: translateX(-50%);
  width: 96px; height: 26px;
  background: #05070a;
  border-radius: 999px;
  z-index: 5;
}
.phone img.phone-img {
  width: 100%;
  height: 100%;
  object-fit: contain;  /* v3.8.0: 完整显示截图，不裁剪（cover 会切掉顶栏/输入框） */
  opacity: 0;
  transition: opacity 0.55s ease;
  position: absolute;
  top: 0; left: 0;
}
.phone img.phone-img.active { opacity: 1; }

.phone-orbit {
  position: absolute;
  width: 74px; height: 74px;
  border-radius: 20px;
  background: rgba(14, 20, 28, 0.92);
  border: 1px solid var(--border-strong);
  backdrop-filter: blur(10px);
  display: grid;
  place-items: center;
  font-family: var(--font-en);
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  text-align: center;
  line-height: 1.3;
  box-shadow: 0 14px 44px rgba(0,0,0,0.5);
  animation: floatY 5.5s ease-in-out infinite;
}
.phone-orbit svg { width: 20px; height: 20px; margin-bottom: 2px; }
.orbit-1 { top: 90px; left: -64px; }
.orbit-2 { bottom: 150px; right: -70px; animation-delay: -2.5s; }
.orbit-3 { bottom: 40px; left: -40px; animation-delay: -1.2s; }
@keyframes floatY {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

/* 滚动提示 */
.scroll-hint {
  position: absolute;
  bottom: 26px; left: 50%;
  transform: translateX(-50%);
  color: var(--text-faint);
  font-size: 12px;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-family: var(--font-en);
}
.scroll-hint .line {
  width: 1.5px; height: 36px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollLine 2s ease-in-out infinite;
}
@keyframes scrollLine {
  0% { transform: scaleY(0); transform-origin: top; }
  45% { transform: scaleY(1); transform-origin: top; }
  55% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ==========================================================================
   信任条(厂商墙)
   ========================================================================== */
.logo-wall {
  padding: 54px 0 30px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: linear-gradient(to bottom, transparent, rgba(45,212,191,0.02), transparent);
}
.logo-wall-label {
  text-align: center;
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 30px;
}
.logo-wall-row {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px 44px;
}
.logo-item {
  font-family: var(--font-en);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: #5b6a7a;
  display: flex; align-items: center; gap: 8px;
  transition: color 0.25s, transform 0.25s;
  cursor: default;
}
.logo-item:hover { color: var(--text); transform: translateY(-2px); }
.logo-item svg { width: 20px; height: 20px; }

/* ==========================================================================
   特性网格
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-top: 20px;
}
/* v3.8.0: TokenHub 4 卡一行（桌面） */
.hub-grid { grid-template-columns: repeat(4, 1fr); }
.feature-card {
  position: relative;
  background: linear-gradient(170deg, var(--surface) 0%, rgba(14,20,28,0.6) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 26px;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  overflow: hidden;
}
.feature-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(45,212,191,0.5), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}
.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-strong);
  box-shadow: var(--glow-accent);
}
.feature-card:hover::before { opacity: 1; }
.feature-icon {
  width: 48px; height: 48px;
  border-radius: 13px;
  background: var(--accent-soft);
  border: 1px solid var(--border-strong);
  display: grid; place-items: center;
  margin-bottom: 20px;
}
.feature-icon svg { width: 23px; height: 23px; color: var(--accent); }
.feature-card h3 { font-size: 18.5px; font-weight: 700; margin-bottom: 10px; letter-spacing: -0.01em; }
.feature-card p { font-size: 14.5px; color: var(--text-dim); line-height: 1.7; }
.feature-tag {
  display: inline-block;
  margin-top: 14px;
  font-size: 12px;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  padding: 3px 9px;
  font-family: var(--font-en);
}

/* ==========================================================================
   截图展示
   ========================================================================== */
.showcase {
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-soft) 50%, var(--bg) 100%);
}
.showcase-stage {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 48px;
  align-items: center;
  margin-top: 20px;
}
.showcase-phone {
  position: relative;
  width: 340px; height: 700px;
  margin: 0 auto;
  border-radius: 44px;
  background: linear-gradient(160deg, #1a2430, #0c1119);
  border: 1px solid rgba(148,178,196,0.2);
  box-shadow: 0 34px 80px rgba(0,0,0,0.55), 0 0 70px rgba(3,184,223,0.06);
  padding: 11px;
}
.showcase-phone .phone-screen {
  border-radius: 34px;
  overflow: hidden;
  height: 100%;
  position: relative;
  background: #05070a;
}
.showcase-phone img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: contain;  /* v3.8.0: 完整显示截图，不裁剪 */
  opacity: 0;
  transition: opacity 0.5s ease;
}
.showcase-phone img.active { opacity: 1; }

.showcase-list { display: flex; flex-direction: column; gap: 10px; }
.showcase-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  align-items: center;
  gap: 16px;
  padding: 18px 20px;
  border-radius: 14px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-dim);
  text-align: left;
  transition: all 0.25s ease;
}
.showcase-item .sc-num {
  font-family: var(--font-en);
  font-size: 15px;
  font-weight: 700;
  width: 42px; height: 42px;
  border-radius: 11px;
  display: grid; place-items: center;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  color: var(--text-faint);
  transition: all 0.25s;
}
.showcase-item h4 { font-size: 16.5px; font-weight: 650; color: var(--text); margin-bottom: 4px; }
.showcase-item p { font-size: 13.5px; color: var(--text-dim); line-height: 1.6; }
.showcase-item:hover { background: rgba(255,255,255,0.02); border-color: var(--border); }
.showcase-item.active {
  background: var(--accent-soft);
  border-color: var(--border-strong);
}
.showcase-item.active .sc-num {
  background: var(--accent-grad);
  color: #03110e;
  border-color: transparent;
}

/* ==========================================================================
   能力流程(Agent 模式)
   ========================================================================== */
.flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-top: 48px;
  counter-reset: flow;
}
/* v3.8.0: 3 步流程（TokenHub 模型调度/三步接入）宽度拉齐 */
.flow-3 { grid-template-columns: repeat(3, 1fr); }
.flow-step {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 22px;
  transition: transform 0.25s, border-color 0.25s;
}
.flow-step:hover { transform: translateY(-4px); border-color: var(--border-strong); }
.flow-step .step-icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  display: grid; place-items: center;
  margin-bottom: 16px;
  background: var(--accent-soft);
  border: 1px solid var(--border-strong);
}
.flow-step .step-icon svg { width: 21px; height: 21px; color: var(--accent); }
.flow-step h4 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.flow-step p { font-size: 13.5px; color: var(--text-dim); line-height: 1.65; }
.flow-arrow {
  position: absolute;
  top: 50%; right: -20px;
  width: 22px; height: 22px;
  color: var(--text-faint);
  transform: translateY(-50%);
  z-index: 2;
}
.flow-arrow svg { width: 100%; height: 100%; }
.flow-step:last-child .flow-arrow { display: none; }

/* 能力场景双列 */
.scenes { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 56px; }
.scene {
  background: linear-gradient(170deg, var(--surface) 0%, rgba(14,20,28,0.5) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 30px;
  position: relative;
  overflow: hidden;
}
.scene::after {
  content: "";
  position: absolute;
  right: -60px; top: -60px;
  width: 180px; height: 180px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(45,212,191,0.08), transparent 70%);
}
.scene .scene-head { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; }
.scene .scene-icon {
  width: 42px; height: 42px;
  border-radius: 12px;
  background: var(--accent-soft);
  border: 1px solid var(--border-strong);
  display: grid; place-items: center;
  flex-shrink: 0;
}
.scene .scene-icon svg { width: 21px; height: 21px; color: var(--accent); }
.scene h3 { font-size: 18px; font-weight: 700; }
.scene p { color: var(--text-dim); font-size: 14.5px; line-height: 1.75; margin-bottom: 16px; }
.scene-example {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--text-dim);
  background: rgba(0,0,0,0.35);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  line-height: 1.8;
}
.scene-example .hl { color: var(--accent); }

/* ==========================================================================
   统计(真实数据)
   ========================================================================== */
.stats-band {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 20px;
}
.stat {
  text-align: center;
  padding: 30px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(45,212,191,0.03), transparent);
}
.stat-val {
  font-size: clamp(34px, 4vw, 46px);
  font-weight: 800;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.1;
  display: block;
}
.stat-label { margin-top: 8px; color: var(--text-dim); font-size: 14px; }
.stat-desc { margin-top: 4px; color: var(--text-faint); font-size: 12px; }

/* ==========================================================================
   定价 / 下载
   ========================================================================== */
.pricing {
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-soft) 60%, var(--bg) 100%);
  position: relative;
  overflow: hidden;
}
.pricing::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 50% 40% at 50% 100%, rgba(45,212,191,0.06), transparent 70%);
  pointer-events: none;
}
.price-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 28px;
  margin-top: 24px;
  align-items: stretch;
}
.price-card {
  background: linear-gradient(170deg, var(--surface-2) 0%, var(--surface) 100%);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  position: relative;
  box-shadow: var(--glow-accent);
  overflow: hidden;
}
.price-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--accent-grad);
}
.price-card .price-flag {
  position: absolute;
  top: 18px; right: 18px;
  font-size: 11.5px;
  font-family: var(--font-en);
  letter-spacing: 0.1em;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--border-strong);
  padding: 4px 10px;
  border-radius: 999px;
}
.price-card h3 { font-size: 21px; font-weight: 700; margin-bottom: 6px; }
.price-card .price-desc { color: var(--text-dim); font-size: 14.5px; margin-bottom: 22px; }
.price-amount { display: flex; align-items: baseline; gap: 6px; margin-bottom: 26px; }
.price-amount .cur { font-size: 22px; font-weight: 700; color: var(--text); }
.price-amount .val { font-size: 58px; font-weight: 800; letter-spacing: -0.03em; background: var(--accent-grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.price-amount .per { font-size: 15px; color: var(--text-faint); }
.price-feats { margin-bottom: 30px; }
.price-feats li {
  display: flex; align-items: flex-start; gap: 10px;
  font-size: 14.5px; color: var(--text-dim);
  padding: 7px 0;
}
.price-feats svg { width: 17px; height: 17px; color: var(--accent); flex-shrink: 0; margin-top: 3px; }

/* 扫码卡 */
.qr-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 34px 30px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
}
.qr-card:hover { border-color: var(--border-strong); transform: translateY(-3px); box-shadow: var(--glow-accent); }
.qr-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 6px; }
.qr-card .qr-sub { color: var(--text-dim); font-size: 13.5px; margin-bottom: 20px; }
.qr-box {
  position: relative;
  width: 200px; height: 200px;
  border-radius: 16px;
  background: #fff;
  padding: 12px;
  margin-bottom: 18px;
  box-shadow: 0 18px 50px rgba(0,0,0,0.5);
}
.qr-box img { width: 100%; height: 100%; object-fit: contain; border-radius: 8px; }
.qr-box .qr-placeholder {
  width: 100%; height: 100%;
  border-radius: 8px;
  display: grid; place-items: center;
  background: repeating-conic-gradient(#eef2f6 0% 25%, #e2e8ef 0% 50%) 0 0 / 20px 20px;
  color: #64748b;
  font-size: 13px;
  text-align: center;
  line-height: 1.5;
  font-family: var(--font-en);
}
.qr-actions { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; }
.qr-tag {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12.5px;
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 12px;
  background: rgba(255,255,255,0.02);
}
.qr-tag svg { width: 14px; height: 14px; color: var(--accent); }

/* 下载信息条 */
.dl-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px 28px;
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  color: var(--text-faint);
  font-size: 13px;
  font-family: var(--font-en);
}
.dl-meta b { color: var(--text-dim); font-weight: 600; }

/* ==========================================================================
   FAQ
   ========================================================================== */
.faq-list { max-width: 820px; margin: 24px auto 0; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  transition: border-color 0.25s;
}
.faq-item.open { border-color: var(--border-strong); }
.faq-q {
  width: 100%;
  background: none;
  border: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  text-align: left;
  color: var(--text);
  font-size: 15.5px;
  font-weight: 600;
}
.faq-q .faq-icon {
  width: 20px; height: 20px;
  flex-shrink: 0;
  position: relative;
  transition: transform 0.3s;
}
.faq-q .faq-icon::before, .faq-q .faq-icon::after {
  content: "";
  position: absolute;
  background: var(--accent);
  border-radius: 2px;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
}
.faq-q .faq-icon::before { width: 14px; height: 2px; }
.faq-q .faq-icon::after { width: 2px; height: 14px; transition: transform 0.3s; }
.faq-item.open .faq-q .faq-icon { transform: rotate(45deg); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px;
  color: var(--text-dim);
  font-size: 14.5px;
  line-height: 1.8;
}
.faq-item.open .faq-a { max-height: 400px; padding: 0 24px 22px; }

/* ==========================================================================
   CTA 横幅
   ========================================================================== */
.cta-band {
  position: relative;
  padding: 90px 0;
  text-align: center;
  overflow: hidden;
}
.cta-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 55% 60% at 50% 50%, rgba(45,212,191,0.10), transparent 70%);
}
.cta-band h2 { font-size: clamp(30px, 4.5vw, 48px); font-weight: 800; letter-spacing: -0.02em; margin-bottom: 16px; }
.cta-band p { color: var(--text-dim); font-size: 17px; max-width: 560px; margin: 0 auto 34px; }

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  border-top: 1px solid var(--border);
  padding: 56px 0 40px;
  background: var(--bg-soft);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 44px;
}
.footer-brand p { color: var(--text-dim); font-size: 14px; margin-top: 14px; line-height: 1.75; max-width: 320px; }
.footer-col h5 {
  font-size: 13px;
  font-family: var(--font-en);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 18px;
}
.footer-col a {
  display: block;
  color: var(--text-dim);
  font-size: 14.5px;
  padding: 5px 0;
  transition: color 0.2s;
}
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
  color: var(--text-faint);
  font-size: 13px;
}
.footer-bottom .legal { display: flex; gap: 22px; }

/* ==========================================================================
   入场动画 (渐进增强: 仅 JS 启用时隐藏, 无 JS 时内容始终可见)
   ========================================================================== */
.js .reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}
.js .reveal.in { opacity: 1; transform: translateY(0); }
.js .reveal-d1 { transition-delay: 0.08s; }
.js .reveal-d2 { transition-delay: 0.16s; }
.js .reveal-d3 { transition-delay: 0.24s; }
.js .reveal-d4 { transition-delay: 0.32s; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1; transform: none; }
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1080px) {
  .hero-grid { grid-template-columns: 1fr; gap: 56px; text-align: center; }
  .hero-sub { margin-left: auto; margin-right: auto; }
  .hero-cta, .hero-trust { justify-content: center; }
  .hero-visual { order: -1; }
  .phone { width: 264px; height: 546px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .hub-grid { grid-template-columns: repeat(2, 1fr); }
  .flow-3 { grid-template-columns: repeat(2, 1fr); }
  .showcase-stage { grid-template-columns: 1fr; }
  .showcase-phone { display: none; }
  .flow { grid-template-columns: repeat(2, 1fr); gap: 28px; }
  .flow-arrow { display: none; }
  .price-grid { grid-template-columns: 1fr; }
  .scenes { grid-template-columns: 1fr; }
  .stats-band { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  .section { padding: 76px 0; }
  .nav-links { display: none; }
  .nav-burger { display: block; }
  .nav-links.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--nav-h); left: 0; right: 0;
    background: rgba(5,7,10,0.97);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 18px 24px 26px;
    gap: 18px;
    align-items: flex-start;
  }
  .nav-cta { display: none; }
  .nav-cta.mobile-open { display: inline-flex; }
  .features-grid { grid-template-columns: 1fr; }
  .flow { grid-template-columns: 1fr; }
  .stats-band { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .price-card { padding: 30px 24px; }
  .hero { padding-top: calc(var(--nav-h) + 32px); }
  .phone-orbit { display: none; }
  .dl-meta { justify-content: flex-start; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

/* ==========================================================================
   v4.4.5 双端协同 (coop) / 数据安全 (security) / 解锁横幅 (unlock-banner)
   ========================================================================== */

/* ---- 协同示意图 ---- */
.coop-stage {
  display: grid;
  grid-template-columns: 1fr 1.7fr 1fr;
  align-items: center;
  gap: 14px;
  margin: 48px auto 0;
  max-width: 1020px;
}
.coop-device { display: flex; flex-direction: column; align-items: center; gap: 14px; }
.coop-device-body {
  width: 100%;
  max-width: 220px;
  border: 1px solid var(--border-strong);
  border-radius: 18px;
  padding: 32px 18px;
  background: linear-gradient(170deg, var(--surface-2), var(--surface));
  box-shadow: var(--glow-accent);
  display: flex; flex-direction: column; align-items: center; gap: 12px;
  transition: transform 0.3s, border-color 0.3s;
}
.coop-device-body:hover { transform: translateY(-4px); border-color: var(--accent); }
.coop-device-body svg { width: 44px; height: 44px; color: var(--accent); }
.coop-device-body span { font-weight: 700; font-size: 15px; letter-spacing: 0.02em; }
.coop-label { font-size: 12.5px; color: var(--text-faint); text-align: center; line-height: 1.6; }

/* 连接线 + 光点 */
.coop-link { position: relative; height: 118px; }
.coop-lines { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; }
.coop-line {
  stroke: rgba(45, 212, 191, 0.32);
  stroke-width: 1.6;
  stroke-dasharray: 6 8;
  animation: dashFlow 3.4s linear infinite;
}
.coop-line.l2 { animation-delay: 0.8s; }
.coop-line.l3 { animation-delay: 1.6s; }
@keyframes dashFlow { to { stroke-dashoffset: -28; } }

.coop-dot {
  position: absolute;
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent);
  animation: dotFly 3.4s ease-in-out infinite;
}
.coop-dot.d1 { top: 21px; }
.coop-dot.d2 { top: 53px; animation-delay: 0.8s; }
.coop-dot.d3 { top: 85px; animation-delay: 1.6s; }
@keyframes dotFly {
  0%   { left: 0; opacity: 0; }
  12%  { opacity: 1; }
  88%  { opacity: 1; }
  100% { left: calc(100% - 9px); opacity: 0; }
}

.coop-node {
  position: absolute;
  left: 50%; transform: translateX(-50%);
  font-size: 11px; color: var(--text-faint);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px 11px;
  white-space: nowrap;
}
.coop-node.n1 { top: 13px; }
.coop-node.n2 { top: 45px; }
.coop-node.n3 { top: 77px; }

/* 协同场景卡 */
.coop-points { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 46px; }
.coop-point {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-align: center;
  transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
}
.coop-point:hover { border-color: var(--border-strong); transform: translateY(-3px); box-shadow: var(--glow-accent); }
.cp-icon {
  width: 46px; height: 46px;
  margin: 0 auto 14px;
  border-radius: 12px;
  background: var(--accent-soft);
  display: grid; place-items: center;
}
.cp-icon svg { width: 22px; height: 22px; color: var(--accent); }
.coop-point h4 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.coop-point p { font-size: 13px; color: var(--text-dim); line-height: 1.7; }

/* ---- 解锁说明横幅 ---- */
.unlock-banner { width: 100%; margin-top: 28px; }
.unlock-steps { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-top: 2px; }

/* ---- 双端协同响应式 ---- */
@media (max-width: 860px) {
  .coop-stage { grid-template-columns: 1fr; max-width: 340px; gap: 22px; }
  .coop-link { width: 100%; }
  .coop-points { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .coop-stage { max-width: 280px; }
}