/* ==========================================
   楠科官网 · 深色科技风
   深空背景 + 紫蓝渐变 + 毛玻璃卡片
   ========================================== */

/* ===== 变量 ===== */
:root {
  /* 品牌色 */
  --accent-purple: #8b5cf6;
  --accent-blue:   #60a5fa;
  --accent-cyan:   #22d3ee;
  --accent-green:  #34d399;

  --grad-primary: linear-gradient(135deg, #8b5cf6 0%, #60a5fa 100%);
  --grad-subtle:  linear-gradient(135deg, rgba(139,92,246,0.15) 0%, rgba(96,165,250,0.15) 100%);
  --grad-hero:    radial-gradient(ellipse 80% 60% at 60% 40%, rgba(88,28,220,0.35) 0%, transparent 70%),
                  radial-gradient(ellipse 60% 50% at 20% 80%, rgba(30,58,138,0.4) 0%, transparent 70%),
                  #060818;

  /* 背景层 */
  --bg-page:    #060818;
  --bg-surface: rgba(255,255,255,0.04);
  --bg-card:    rgba(255,255,255,0.05);
  --bg-card-hover: rgba(255,255,255,0.08);
  --bg-input:   rgba(255,255,255,0.06);

  /* 边框 */
  --border:     rgba(255,255,255,0.10);
  --border-md:  rgba(255,255,255,0.16);
  --border-accent: rgba(139,92,246,0.5);

  /* 文字 */
  --text-primary:   #f1f5f9;
  --text-secondary: rgba(241,245,249,0.62);
  --text-muted:     rgba(241,245,249,0.38);

  /* 导航 */
  --nav-bg:     rgba(6,8,24,0.75);
  --nav-border: rgba(255,255,255,0.08);

  /* Footer */
  --footer-bg:   #030610;
  --footer-text: rgba(241,245,249,0.35);
  --footer-link: rgba(241,245,249,0.55);

  /* 字体 */
  --font: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* 尺寸 */
  --nav-h:     64px;
  --banner-h:  40px;
  --radius:    12px;
  --radius-lg: 18px;
  --max-w:     1200px;

  /* 动效 */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --dur:  0.2s;
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  color: var(--text-primary);
  background: var(--bg-page);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { font-family: var(--font); cursor: pointer; }

/* ===== 工具 ===== */
.section-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 32px;
}

/* ===== 公告条 ===== */
.top-banner {
  height: var(--banner-h);
  background: linear-gradient(90deg, rgba(139,92,246,0.9) 0%, rgba(96,165,250,0.9) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-size: 0.85rem;
  color: #fff;
  font-weight: 500;
  letter-spacing: 0.01em;
  backdrop-filter: blur(8px);
}
.top-banner a {
  color: #fff;
  opacity: 0.85;
  border-bottom: 1px solid rgba(255,255,255,0.5);
  transition: opacity var(--dur) var(--ease);
}
.top-banner a:hover { opacity: 1; }

/* ===== 导航 ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 900;
  height: var(--nav-h);
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--nav-border);
  transition: box-shadow var(--dur) var(--ease);
}
.navbar.shadow { box-shadow: 0 1px 24px rgba(0,0,0,0.5); }

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 32px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 40px;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-img {
  height: 40px;
  width: auto;
  display: block;
  object-fit: contain;
}
.logo-img--sm { height: 28px; }
.logo-img--footer {
  height: 44px;
  filter: brightness(0) invert(1);
  opacity: 0.9;
}

/* 导航链接 */
.nav-links { flex: 1; }
.nav-group { display: flex; align-items: center; gap: 4px; }
.nav-item {
  padding: 8px 14px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: 8px;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}
.nav-item:hover { background: var(--bg-surface); color: var(--text-primary); }

/* 导航按钮 */
.nav-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}
.btn-nav {
  padding: 8px 20px;
  background: var(--grad-primary);
  color: #fff;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 600;
  border: none;
  transition: opacity var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.btn-nav:hover { opacity: 0.88; box-shadow: 0 4px 20px rgba(139,92,246,0.4); color: #fff; }

/* 汉堡 */
.hamburger {
  display: none;
  flex-direction: column; gap: 5px;
  background: none; border: none; padding: 4px; margin-left: auto;
}
.hamburger span { display: block; width: 22px; height: 2px; background: var(--text-secondary); border-radius: 2px; transition: all var(--dur) var(--ease); }

/* ===== 按钮系统 ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 30px;
  border-radius: 100px;
  font-size: 0.95rem; font-weight: 600;
  border: none; cursor: pointer;
  font-family: var(--font);
  transition: all var(--dur) var(--ease);
  white-space: nowrap;
}
.btn-primary {
  background: var(--grad-primary);
  color: #fff;
  box-shadow: 0 4px 24px rgba(139,92,246,0.35);
}
.btn-primary:hover {
  box-shadow: 0 8px 32px rgba(139,92,246,0.5);
  transform: translateY(-2px);
  color: #fff;
  opacity: 0.92;
}

.btn-ghost {
  background: rgba(255,255,255,0.06);
  color: var(--text-primary);
  border: 1.5px solid var(--border-md);
  backdrop-filter: blur(8px);
}
.btn-ghost:hover {
  background: rgba(255,255,255,0.1);
  border-color: var(--accent-purple);
  color: #fff;
  transform: translateY(-2px);
}

.btn-submit {
  width: 100%; justify-content: center;
  border-radius: var(--radius);
  padding: 14px;
  font-size: 1rem;
}

/* ===== Hero ===== */
.hero {
  min-height: calc(100vh - var(--nav-h) - var(--banner-h));
  background: var(--grad-hero);
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 0;
  max-width: 100%;
  padding: 80px max(32px, calc((100vw - var(--max-w)) / 2 + 32px));
}

/* 背景星点 */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle, rgba(255,255,255,0.55) 1px, transparent 1px),
    radial-gradient(circle, rgba(255,255,255,0.3) 1px, transparent 1px);
  background-size: 60px 60px, 100px 100px;
  background-position: 0 0, 30px 30px;
  pointer-events: none;
  opacity: 0.25;
}

/* 光晕装饰 */
.hero::after {
  content: '';
  position: absolute;
  top: -200px; right: -100px;
  width: 700px; height: 700px;
  background: radial-gradient(circle, rgba(139,92,246,0.18) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  max-width: 560px;
  position: relative;
  z-index: 1;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(139,92,246,0.15);
  border: 1px solid rgba(139,92,246,0.4);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--accent-purple);
  margin-bottom: 28px;
  backdrop-filter: blur(8px);
}
.hero-eyebrow::before { content: '🚀'; font-size: 0.85rem; }

.hero-title {
  font-size: clamp(2.6rem, 5vw, 4.2rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.08;
  color: #fff;
  margin-bottom: 28px;
}

/* 标题渐变高亮 */
.hero-title .highlight {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.78;
  margin-bottom: 44px;
  max-width: 520px;
}

.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }

/* Hero 视觉卡片 */
.hero-visual {
  padding-left: 48px;
  position: relative;
  z-index: 1;
}

.hv-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 14px;
}

.hv-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.hv-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-accent);
  transform: translateY(-2px);
}
.hv-card--lg { grid-row: span 1; }
.hv-card--wide { grid-column: span 2; }

.hvc-label { font-size: 0.8rem; font-weight: 700; color: var(--text-primary); margin-bottom: 4px; }
.hvc-sub { font-size: 0.72rem; color: var(--text-muted); margin-bottom: 12px; }

.hvc-bar {
  height: 5px; background: rgba(255,255,255,0.08); border-radius: 3px; margin-bottom: 6px; overflow: hidden;
}
.hvc-bar span {
  display: block; height: 100%;
  background: linear-gradient(90deg, var(--accent-purple), var(--accent-blue));
  border-radius: 3px;
  animation: bar-grow 1.2s var(--ease) both;
}
.hvc-bar:nth-child(3) span { animation-delay: 0.1s; }
.hvc-bar:nth-child(4) span { animation-delay: 0.2s; }

@keyframes bar-grow { from { width: 0 !important; } }

.hvc-chip {
  display: inline-flex; align-items: center; gap: 5px;
  margin-top: 10px;
  padding: 3px 10px;
  background: rgba(139,92,246,0.18);
  color: var(--accent-purple);
  border-radius: 100px;
  font-size: 0.7rem; font-weight: 600;
  border: 1px solid rgba(139,92,246,0.3);
}
.hvc-chip::before { content: ''; width: 6px; height: 6px; background: var(--accent-purple); border-radius: 50%; animation: pulse-dot 1.5s ease infinite; }
.hvc-chip--green { background: rgba(52,211,153,0.12); color: var(--accent-green); border-color: rgba(52,211,153,0.3); }
.hvc-chip--green::before { background: var(--accent-green); }
.hvc-chip--purple { background: rgba(139,92,246,0.12); color: var(--accent-purple); border-color: rgba(139,92,246,0.3); }
.hvc-chip--purple::before { background: var(--accent-purple); }

@keyframes pulse-dot { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:0.5;transform:scale(0.8)} }

.hvc-nodes { display: flex; align-items: center; gap: 8px; margin: 12px 0 8px; }
.hvc-node {
  flex: 1; text-align: center;
  padding: 8px 4px;
  border-radius: 8px;
  font-size: 0.7rem; font-weight: 700;
}
.hvc-node--brain { background: rgba(96,165,250,0.15); color: var(--accent-blue); border: 1px solid rgba(96,165,250,0.3); }
.hvc-node--rpa   { background: rgba(52,211,153,0.12); color: var(--accent-green); border: 1px solid rgba(52,211,153,0.25); }
.hvc-arrow { color: var(--text-muted); font-size: 1rem; }

.hvc-wave { color: var(--accent-purple); margin: 12px 0 8px; }
.hvc-wave svg { width: 100%; height: 36px; }

.hvc-pills { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.hvc-pills span {
  padding: 4px 10px;
  background: rgba(255,255,255,0.07);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.72rem; font-weight: 500; color: var(--text-secondary);
}

/* ===== 数据带 ===== */
.stats-band {
  background: rgba(255,255,255,0.03);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 48px 32px;
}
.stats-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
}
.stat-item {
  flex: 1;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.stat-num {
  font-size: 2.6rem;
  font-weight: 800;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.03em;
  line-height: 1;
  display: inline;
}
.stat-unit {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent-blue);
}
.stat-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-top: 4px;
}
.stat-sep { width: 1px; height: 52px; background: var(--border); flex-shrink: 0; margin: 0 28px; }

/* ===== section 通用 ===== */
.section-overline {
  font-size: 0.78rem; font-weight: 700; letter-spacing: 0.1em;
  text-transform: uppercase;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 14px;
  display: inline-block;
}
.section-h2 {
  font-size: clamp(1.9rem, 3vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.18;
  color: var(--text-primary);
  margin-bottom: 16px;
}
.section-lead {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.7;
}
.section-head {
  text-align: center;
  margin-bottom: 80px;
}
.section-head .section-lead { margin: 0 auto; }

/* ===== 产品列表 ===== */
.products { padding: 110px 0; }

.products-list { display: flex; flex-direction: column; }

.product-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  padding: 80px 0;
}
.product-row--rev .product-text { order: 2; }
.product-row--rev .product-visual { order: 1; }

.product-divider { height: 1px; background: var(--border); }

.product-tag {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 100px;
  font-size: 0.72rem; font-weight: 700;
  letter-spacing: 0.05em; text-transform: uppercase;
  margin-bottom: 18px;
}
.tag-blue   { background: rgba(96,165,250,0.14);  color: var(--accent-blue);  border: 1px solid rgba(96,165,250,0.3); }
.tag-purple { background: rgba(139,92,246,0.14);  color: var(--accent-purple);border: 1px solid rgba(139,92,246,0.3); }
.tag-green  { background: rgba(52,211,153,0.12);  color: var(--accent-green); border: 1px solid rgba(52,211,153,0.3); }

.product-h3 {
  font-size: clamp(1.7rem, 2.5vw, 2.1rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: #fff;
  margin-bottom: 18px;
}

.product-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.78;
  margin-bottom: 26px;
}

.product-feats {
  display: flex; flex-direction: column; gap: 11px;
  margin-bottom: 30px;
}
.product-feats li {
  display: flex; align-items: center; gap: 10px;
  font-size: 0.9rem; color: var(--text-secondary);
}
.product-feats li::before {
  content: '';
  width: 18px; height: 18px; flex-shrink: 0;
  background: rgba(52,211,153,0.12);
  border-radius: 50%;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 16 16' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M3.5 8l3 3 6-6' stroke='%2334d399' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-size: 14px; background-repeat: no-repeat; background-position: center;
  border: 1px solid rgba(52,211,153,0.25);
}

.link-arrow {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.9rem; font-weight: 600;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  transition: gap var(--dur) var(--ease);
}
.link-arrow:hover { gap: 10px; }
.link-arrow svg { width: 16px; height: 16px; stroke: var(--accent-purple); -webkit-text-fill-color: initial; flex-shrink: 0; }

/* 产品视觉区 */
.product-visual {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  position: relative;
}
.product-visual::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--grad-subtle);
  opacity: 0.5;
  pointer-events: none;
}

/* InkedVision 视觉 */
.pv-screen {
  width: 100%;
  background: rgba(6,8,24,0.8);
  border: 1px solid var(--border-md);
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  z-index: 1;
}
.pv-topbar {
  background: rgba(255,255,255,0.04);
  padding: 10px 16px;
  display: flex; gap: 6px; align-items: center;
  border-bottom: 1px solid var(--border);
}
.pv-topbar span { width: 10px; height: 10px; border-radius: 50%; }
.pv-topbar span:nth-child(1) { background: #ff5f57; }
.pv-topbar span:nth-child(2) { background: #febc2e; }
.pv-topbar span:nth-child(3) { background: #28c840; }
.pv-content { padding: 20px; }

.pv-timeline { display: flex; flex-direction: column; gap: 8px; margin-bottom: 20px; }
.pvt-track {
  height: 24px; background: rgba(255,255,255,0.05); border-radius: 4px; overflow: hidden; position: relative;
}
.pvt-block {
  position: absolute; top: 2px; height: 20px; border-radius: 3px;
  animation: pvt-slide 2s var(--ease) infinite alternate;
}
.pvt-track--1 .pvt-block { left: 0; width: 70%; background: linear-gradient(90deg, #8b5cf6, rgba(139,92,246,0.3)); }
.pvt-track--2 .pvt-block { left: 15%; width: 55%; background: linear-gradient(90deg, #60a5fa, rgba(96,165,250,0.3)); animation-delay: 0.3s; }
.pvt-track--3 .pvt-block { left: 5%; width: 80%; background: linear-gradient(90deg, #22d3ee, rgba(34,211,238,0.3)); animation-delay: 0.6s; }

@keyframes pvt-slide { from{transform:translateX(0)} to{transform:translateX(6px)} }

.pv-label { font-size: 0.78rem; color: var(--text-muted); margin-bottom: 8px; font-weight: 500; }
.pv-progress { height: 6px; background: rgba(255,255,255,0.07); border-radius: 3px; overflow: hidden; }
.pv-progress span { display: block; height: 100%; background: linear-gradient(90deg, var(--accent-purple), var(--accent-blue)); border-radius: 3px; animation: bar-grow 1.5s var(--ease) both; }

/* LingoVista ARX 视觉 */
.pv-vr {
  width: 100%;
  display: flex; flex-direction: column; align-items: center; gap: 20px;
  position: relative; z-index: 1;
}

.pvr-lens--l, .pvr-lens--r {
  width: 88px; height: 54px;
  border-radius: 18px;
  border: 3px solid rgba(139,92,246,0.6);
  background: linear-gradient(135deg, rgba(139,92,246,0.18), rgba(96,165,250,0.15));
  flex-shrink: 0;
  box-shadow: 0 0 20px rgba(139,92,246,0.2) inset;
}
.pvr-bridge {
  width: 28px; height: 3px;
  background: rgba(139,92,246,0.6); border-radius: 2px;
  flex-shrink: 0; margin: 0;
}

.pvr-wave { width: 100%; color: var(--accent-purple); }
.pvr-wave svg { width: 100%; height: 44px; }
.pvr-score {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border-md);
  border-radius: 100px;
  padding: 8px 20px;
  font-size: 0.875rem; color: var(--text-secondary); font-weight: 500;
  backdrop-filter: blur(8px);
}
.pvr-score strong { color: var(--accent-green); font-size: 1.1rem; margin-left: 4px; }

/* VR 眼镜布局 */
.pv-lingo .pv-vr { position: relative; }
.pvr-glasses-wrap { display: flex; align-items: center; gap: 0; margin-bottom: 20px; }

/* Multi-Agent 视觉 */
.pva-flow {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  position: relative; z-index: 1;
}
.pva-node {
  width: 100%;
  background: rgba(255,255,255,0.05);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  text-align: center;
  backdrop-filter: blur(8px);
}
.pva-brain { border-color: rgba(96,165,250,0.4); box-shadow: 0 0 20px rgba(96,165,250,0.1) inset; }
.pva-rpa   { border-color: rgba(52,211,153,0.4); box-shadow: 0 0 20px rgba(52,211,153,0.08) inset; }

.pva-icon { font-size: 1.8rem; margin-bottom: 8px; }
.pva-node span { display: block; font-size: 0.9rem; font-weight: 700; color: var(--text-primary); margin-bottom: 4px; }
.pva-node small { font-size: 0.75rem; color: var(--text-muted); }

.pva-connector {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 10px 0;
}
.pva-line {
  width: 2px; height: 28px;
  background: linear-gradient(to bottom, var(--accent-blue), var(--accent-green));
  position: relative;
}
.pva-line::after {
  content: '';
  position: absolute;
  bottom: -5px; left: 50%;
  transform: translateX(-50%);
  width: 0; height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 6px solid var(--accent-green);
}
.pva-arrow-label {
  font-size: 0.7rem; font-weight: 600;
  color: var(--text-muted); letter-spacing: 0.04em;
}

/* ===== 关于我们 ===== */
.about {
  padding: 110px 0;
  background: rgba(255,255,255,0.02);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-p { font-size: 1rem; color: var(--text-secondary); line-height: 1.78; margin-bottom: 18px; }

.about-values { display: flex; flex-direction: column; gap: 22px; margin-top: 36px; }
.av-item { display: flex; gap: 16px; align-items: flex-start; }
.av-icon {
  width: 38px; height: 38px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  backdrop-filter: blur(8px);
}
.av-icon svg { width: 18px; height: 18px; }
.av-icon--blue   { background: rgba(96,165,250,0.15);  color: var(--accent-blue);  border: 1px solid rgba(96,165,250,0.3); }
.av-icon--green  { background: rgba(52,211,153,0.12);  color: var(--accent-green); border: 1px solid rgba(52,211,153,0.3); }
.av-icon--purple { background: rgba(139,92,246,0.15);  color: var(--accent-purple);border: 1px solid rgba(139,92,246,0.3); }
.av-item strong { display: block; font-size: 0.9rem; font-weight: 700; color: var(--text-primary); margin-bottom: 4px; }
.av-item p { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.6; margin: 0; }

/* 关于卡片堆叠 */
.about-card-stack { position: relative; padding: 20px 20px 20px 0; }

.acs-card {
  border-radius: var(--radius-lg);
  position: absolute;
}
.acs-card--back {
  top: 0; right: -8px;
  width: calc(100% - 16px); height: calc(100% - 16px);
  background: rgba(139,92,246,0.08);
  border: 1px solid rgba(139,92,246,0.2);
  border-radius: var(--radius-lg);
}
.acs-card--mid {
  top: 8px; right: -4px;
  width: calc(100% - 8px); height: calc(100% - 8px);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  box-shadow: 0 4px 24px rgba(0,0,0,0.3);
  border-radius: var(--radius-lg);
}
.acs-card--front {
  position: relative;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border-md);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.4);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.acs-head { display: flex; align-items: center; gap: 10px; margin-bottom: 20px; }
.acs-head span { font-size: 0.9rem; font-weight: 600; color: var(--text-primary); }

.acs-title {
  font-size: 1.1rem; font-weight: 700;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
}
.acs-divider { height: 1px; background: var(--border); margin-bottom: 16px; }

.acs-items { display: flex; flex-direction: column; gap: 12px; margin-bottom: 20px; }
.acs-item { display: flex; align-items: center; gap: 10px; font-size: 0.875rem; color: var(--text-secondary); font-weight: 500; }
.acs-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.acs-dot--blue   { background: var(--accent-blue); }
.acs-dot--purple { background: var(--accent-purple); }
.acs-dot--green  { background: var(--accent-green); }

.acs-footer { font-size: 0.75rem; color: var(--text-muted); border-top: 1px solid var(--border); padding-top: 16px; }

/* ===== 联系我们 ===== */
.contact { padding: 110px 0; }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 80px;
  align-items: start;
}

.contact-lead { font-size: 1rem; color: var(--text-secondary); line-height: 1.75; margin-bottom: 36px; }

.contact-info { display: flex; flex-direction: column; gap: 18px; }
.ci-row { display: flex; align-items: center; gap: 12px; font-size: 0.9rem; color: var(--text-secondary); }
.ci-row svg { width: 20px; height: 20px; color: var(--text-muted); flex-shrink: 0; }

/* 表单 */
.contact-form { display: flex; flex-direction: column; gap: 0; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-field { display: flex; flex-direction: column; gap: 7px; margin-bottom: 16px; }
.form-field label { font-size: 0.82rem; font-weight: 600; color: var(--text-secondary); }
.form-field input,
.form-field select,
.form-field textarea {
  padding: 11px 14px;
  border: 1.5px solid var(--border-md);
  border-radius: var(--radius);
  font-size: 0.9rem;
  color: var(--text-primary);
  font-family: var(--font);
  background: var(--bg-input);
  backdrop-filter: blur(8px);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
  outline: none;
  width: 100%;
}
.form-field select option { background: #0f1229; color: var(--text-primary); }
.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  border-color: var(--accent-purple);
  box-shadow: 0 0 0 3px rgba(139,92,246,0.18);
}
.form-field input::placeholder,
.form-field textarea::placeholder { color: var(--text-muted); }
.form-field textarea { resize: vertical; min-height: 110px; }

.form-success {
  display: none;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 60px 0;
  gap: 12px;
}
.fs-icon {
  width: 56px; height: 56px;
  background: rgba(52,211,153,0.12);
  border: 2px solid var(--accent-green);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem; color: var(--accent-green);
  margin-bottom: 4px;
  box-shadow: 0 0 24px rgba(52,211,153,0.25);
}
.form-success h3 { font-size: 1.2rem; font-weight: 700; color: #fff; }
.form-success p { font-size: 0.9rem; color: var(--text-secondary); }

/* ===== Footer ===== */
.footer {
  background: var(--footer-bg);
  border-top: 1px solid var(--border);
  color: #fff;
  padding: 60px 0 32px;
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 32px;
}
.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 48px;
  gap: 40px;
}

.footer-nav { display: flex; gap: 56px; }
.fn-col { display: flex; flex-direction: column; gap: 10px; }
.fn-col h4 {
  font-size: 0.78rem; font-weight: 700; letter-spacing: 0.07em;
  text-transform: uppercase; color: var(--footer-text); margin-bottom: 4px;
}
.fn-col a { font-size: 0.875rem; color: var(--footer-link); transition: color var(--dur) var(--ease); }
.fn-col a:hover { color: #fff; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.07);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.footer-bottom p { font-size: 0.8rem; color: var(--footer-text); }
.footer-bottom a { color: var(--footer-link); transition: color var(--dur) var(--ease); }
.footer-bottom a:hover { color: #fff; }
.footer-bottom-right { display: flex; flex-direction: column; align-items: flex-end; gap: 4px; }

/* ===== AOS ===== */
[data-aos] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
[data-aos].aos-animate { opacity: 1; transform: none; }
[data-aos][data-aos-delay="100"] { transition-delay: 100ms; }
[data-aos][data-aos-delay="200"] { transition-delay: 200ms; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .hero {
    grid-template-columns: 1fr;
    padding: 60px 32px;
    gap: 48px;
  }
  .hero-inner { max-width: 100%; }
  .hero-visual { padding-left: 0; }
  .product-row { grid-template-columns: 1fr; gap: 40px; }
  .product-row--rev .product-text { order: 0; }
  .product-row--rev .product-visual { order: 0; }
  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .contact-grid { grid-template-columns: 1fr; gap: 48px; }
}

@media (max-width: 768px) {
  .top-banner { font-size: 0.78rem; padding: 0 16px; gap: 8px; }
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column;
    position: fixed; inset: 0; top: calc(var(--nav-h) + var(--banner-h));
    background: rgba(6,8,24,0.97);
    backdrop-filter: blur(24px);
    padding: 32px;
    gap: 8px;
    z-index: 800;
    border-top: 1px solid var(--border);
  }
  .nav-links.open .nav-item { font-size: 1.1rem; padding: 12px 16px; }
  .nav-actions { display: none; }
  .hamburger { display: flex; }
  .section-inner { padding: 0 20px; }
  .stats-inner { flex-wrap: wrap; gap: 24px; }
  .stat-sep { display: none; }
  .stat-item { min-width: calc(50% - 12px); }
  .hv-grid { grid-template-columns: 1fr; }
  .hv-card--wide { grid-column: auto; }
  .footer-top { flex-direction: column; }
  .footer-nav { flex-direction: column; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .form-row { grid-template-columns: 1fr; }
  .hero { padding: 48px 20px; }
  .products { padding: 72px 0; }
  .about { padding: 72px 0; }
  .contact { padding: 72px 0; }
  .product-row { padding: 52px 0; }
  .br-desk { display: none; }
}

@media (max-width: 480px) {
  :root { --banner-h: 36px; }
  .hero-cta { flex-direction: column; }
  .btn { justify-content: center; }
  .about-card-stack { padding: 12px 12px 12px 0; }
}