/* =========================================================
   即先冠英 · 制造业智能体平台 官网样式
   科技感深色 · 霓虹青紫渐变 · 玻璃拟态
   ========================================================= */

/* ---------- 设计变量 ---------- */
:root {
  --bg: #05070f;
  --bg-2: #0a0f1e;
  --bg-3: #0d1428;
  --card: rgba(255, 255, 255, 0.035);
  --card-hover: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);
  --text: #e6ecf8;
  --text-dim: #94a3b8;
  --text-faint: #64748b;
  --cyan: #22d3ee;
  --blue: #38bdf8;
  --violet: #8b5cf6;
  --pink: #e879f9;
  --grad: linear-gradient(120deg, #22d3ee 0%, #38bdf8 45%, #8b5cf6 100%);
  --grad-soft: linear-gradient(120deg, rgba(34, 211, 238, 0.15), rgba(139, 92, 246, 0.15));
  --radius: 18px;
  --radius-sm: 12px;
  --nav-h: 72px;
  --shadow-card: 0 20px 60px rgba(0, 0, 0, 0.45);
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

html { scroll-behavior: smooth; }

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

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

::selection { background: rgba(56, 189, 248, 0.35); color: #fff; }

::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: #1e2a45; border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: #2c3d63; }

/* ---------- 背景装饰 ---------- */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(rgba(148, 163, 184, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.05) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 40%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 40%, transparent 100%);
  pointer-events: none;
}

.bg-glow {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(900px 520px at 85% -10%, rgba(139, 92, 246, 0.16), transparent 60%),
    radial-gradient(800px 480px at 10% -10%, rgba(34, 211, 238, 0.14), transparent 60%),
    radial-gradient(700px 700px at 50% 110%, rgba(56, 189, 248, 0.06), transparent 60%);
  pointer-events: none;
}

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.2px;
  transition: all 0.28s ease;
  cursor: pointer;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn svg { width: 18px; height: 18px; flex-shrink: 0; }

.btn-lg { padding: 15px 34px; font-size: 16px; }

.btn-sm { padding: 9px 18px; font-size: 14px; }

.btn-block { width: 100%; }

.btn-primary {
  background: var(--grad);
  color: #04121c;
  box-shadow: 0 8px 28px rgba(56, 189, 248, 0.35), 0 2px 8px rgba(139, 92, 246, 0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 36px rgba(56, 189, 248, 0.45), 0 4px 14px rgba(139, 92, 246, 0.4);
  filter: brightness(1.06);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--border-strong);
  color: var(--text);
  backdrop-filter: blur(8px);
}
.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(34, 211, 238, 0.5);
  transform: translateY(-2px);
}

.btn-ghost-light {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(255, 255, 255, 0.22);
  color: #fff;
}
.btn-ghost-light:hover {
  background: rgba(255, 255, 255, 0.14);
  transform: translateY(-2px);
}

/* ---------- 导航 ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  transition: background 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background: rgba(5, 7, 15, 0.78);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--border);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  height: 100%;
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.brand-mark {
  width: 38px;
  height: 38px;
  filter: drop-shadow(0 4px 14px rgba(56, 189, 248, 0.4));
}

.brand-text {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 1px;
  color: #fff;
  white-space: nowrap;
}

.brand-sub {
  font-size: 11.5px;
  font-weight: 500;
  color: var(--text-dim);
  margin-left: 4px;
  letter-spacing: 0.5px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  padding: 9px 15px;
  font-size: 14.5px;
  color: var(--text-dim);
  border-radius: 10px;
  transition: color 0.2s ease, background 0.2s ease;
}

.nav-links a:hover { color: #fff; background: rgba(255, 255, 255, 0.06); }

.nav-actions { display: flex; align-items: center; gap: 10px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 42px; height: 42px;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
}
.nav-toggle span {
  width: 18px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-h) + 40px) 28px 90px;
  overflow: hidden;
}

/* Hero 背景视频切片平铺（2×2） */
.hero-video-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: 3px;
  background:
    radial-gradient(120% 100% at 50% 0%, rgba(56, 189, 248, 0.1), transparent 55%),
    linear-gradient(160deg, #0b1224, #070b18);
  pointer-events: none;
}

.hero-video-cell {
  position: relative;
  overflow: hidden;
}

.hero-video-cell video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  background: transparent;
  transform: scale(1.06);
  animation: hero-video-drift 24s ease-in-out infinite alternate;
}

@keyframes hero-video-drift {
  0% { transform: scale(1.06) translate(0, 0); }
  100% { transform: scale(1.12) translate(-0.8%, 0.8%); }
}

/* 深色遮罩：保证前景文案可读 + 与下方板块自然衔接 */
.hero-video-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    linear-gradient(to bottom, rgba(5, 7, 15, 0.82) 0%, rgba(5, 7, 15, 0.66) 45%, rgba(5, 7, 15, 0.8) 82%, #05070f 100%),
    radial-gradient(90% 60% at 50% 40%, transparent 40%, rgba(5, 7, 15, 0.35) 100%);
}

.hero-inner {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 56px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 18px;
  border-radius: 999px;
  font-size: 13px;
  color: var(--cyan);
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.25);
  margin-bottom: 26px;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.badge-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 0 rgba(34, 211, 238, 0.6);
  animation: pulse-dot 2s ease-out infinite;
}

@keyframes pulse-dot {
  0% { box-shadow: 0 0 0 0 rgba(34, 211, 238, 0.55); }
  70% { box-shadow: 0 0 0 12px rgba(34, 211, 238, 0); }
  100% { box-shadow: 0 0 0 0 rgba(34, 211, 238, 0); }
}

.hero-title {
  font-size: clamp(34px, 4.6vw, 56px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: 0.5px;
  margin-bottom: 22px;
  color: #f4f7ff;
}

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.hero-desc {
  font-size: 16.5px;
  color: var(--text-dim);
  max-width: 540px;
  margin-bottom: 34px;
}

.hero-desc .hl {
  color: var(--cyan);
  font-weight: 600;
}

.hero-cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}

.hero-tags {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  color: var(--text-faint);
  font-size: 13.5px;
}
.hero-tags i {
  width: 3px; height: 3px;
  border-radius: 50%;
  background: var(--text-faint);
}

.hero-scroll {
  position: absolute;
  z-index: 2;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: var(--text-faint);
  font-size: 12px;
  letter-spacing: 2px;
  animation: float-y 2.4s ease-in-out infinite;
}

.hero-scroll svg { width: 20px; height: 20px; }

/* ---------- 对话演示 mockup ---------- */
.demo-wrap {
  position: relative;
}

.demo-window {
  position: relative;
  z-index: 2;
  border-radius: 20px;
  background: linear-gradient(160deg, rgba(17, 25, 45, 0.92), rgba(9, 14, 28, 0.95));
  border: 1px solid var(--border-strong);
  box-shadow: 0 40px 100px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(56, 189, 248, 0.06), 0 0 60px rgba(56, 189, 248, 0.08);
  overflow: hidden;
  animation: float-y 6s ease-in-out infinite;
}

@keyframes float-y {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.demo-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 18px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border);
}

.dot { width: 11px; height: 11px; border-radius: 50%; }
.dot-r { background: #ff5f57; }
.dot-y { background: #febc2e; }
.dot-g { background: #28c840; }

.demo-title {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-left: 12px;
  font-size: 13px;
  color: var(--text-dim);
  letter-spacing: 0.5px;
}
.demo-title svg { width: 15px; height: 15px; color: var(--cyan); }

.demo-status {
  margin-left: auto;
  font-size: 11.5px;
  color: #34d399;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(52, 211, 153, 0.1);
  border: 1px solid rgba(52, 211, 153, 0.25);
}

.demo-body {
  padding: 22px 20px;
  min-height: 336px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.msg {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.msg-user { flex-direction: row-reverse; }

.avatar {
  width: 34px; height: 34px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
}

.av-agent {
  background: var(--grad);
  color: #04121c;
  box-shadow: 0 4px 14px rgba(56, 189, 248, 0.35);
}

.av-user {
  background: rgba(255, 255, 255, 0.09);
  border: 1px solid var(--border-strong);
  color: var(--text);
}

.bubble {
  padding: 12px 16px;
  border-radius: 14px;
  font-size: 14px;
  line-height: 1.65;
  max-width: 82%;
}

.msg-user .bubble {
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.28);
  border-top-right-radius: 4px;
}

.msg-agent .bubble {
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid var(--border);
  border-top-left-radius: 4px;
}

.type-text { white-space: pre-wrap; }
.cursor {
  display: inline-block;
  color: var(--cyan);
  animation: blink 0.9s step-end infinite;
  font-weight: 400;
}

@keyframes blink { 50% { opacity: 0; } }

.demo-input {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 16px 16px;
  padding: 11px 12px 11px 16px;
  border-radius: 13px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  color: var(--text-faint);
  font-size: 13.5px;
}

.demo-input > svg { width: 17px; height: 17px; flex-shrink: 0; }

.demo-input button {
  margin-left: auto;
  width: 34px; height: 34px;
  border-radius: 10px;
  border: none;
  background: var(--grad);
  color: #04121c;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.2s ease;
}
.demo-input button:hover { transform: scale(1.08); }
.demo-input button svg { width: 16px; height: 16px; }

.demo-orbit {
  position: absolute;
  border: 1px dashed rgba(56, 189, 248, 0.25);
  border-radius: 50%;
  z-index: 1;
}
.demo-orbit-1 {
  width: 105%; height: 105%;
  top: -2.5%; left: -2.5%;
  animation: spin 30s linear infinite;
}
.demo-orbit-2 {
  width: 115%; height: 115%;
  top: -7.5%; left: -7.5%;
  border-color: rgba(139, 92, 246, 0.2);
  animation: spin 46s linear infinite reverse;
}

@keyframes spin { to { transform: rotate(360deg); } }

.demo-chip {
  position: absolute;
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 9px 15px;
  border-radius: 12px;
  font-size: 12.5px;
  font-weight: 600;
  background: rgba(13, 20, 40, 0.9);
  border: 1px solid var(--border-strong);
  backdrop-filter: blur(10px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
}

.demo-chip svg { width: 15px; height: 15px; }

.chip-1 {
  top: -18px; right: -8px;
  color: var(--cyan);
  animation: float-y 4s ease-in-out infinite;
}
.chip-2 {
  bottom: 12%; left: -30px;
  color: #34d399;
  animation: float-y 5s ease-in-out infinite 1s;
}

/* ---------- 数据统计 ---------- */
.stats {
  position: relative;
  padding: 60px 28px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, transparent, rgba(13, 20, 40, 0.6), transparent);
}

.stats-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

.stat {
  text-align: center;
  padding: 10px 0;
}

.stat-num {
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
  letter-spacing: 0.5px;
}

.stat-label {
  margin-top: 8px;
  font-size: 14px;
  color: var(--text-dim);
  letter-spacing: 1px;
}

/* ---------- 通用区块 ---------- */
.section {
  padding: 110px 28px;
  position: relative;
}

.section-alt { background: rgba(10, 15, 30, 0.5); }

.section-inner { max-width: 1200px; margin: 0 auto; }
.section-narrow { max-width: 860px; }

.section-head {
  text-align: center;
  max-width: min(900px, 100%);
  margin: 0 auto 64px;
}

.section-tag {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--cyan);
  text-transform: uppercase;
  padding: 6px 16px;
  border-radius: 999px;
  background: rgba(34, 211, 238, 0.07);
  border: 1px solid rgba(34, 211, 238, 0.22);
  margin-bottom: 20px;
}

.section-title {
  font-size: clamp(22px, 3.4vw, 40px);
  font-weight: 800;
  line-height: 1.3;
  color: #f4f7ff;
  margin-bottom: 18px;
  white-space: nowrap;
}

.section-title em { font-style: normal; }

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

/* ---------- 卡片 ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: transform 0.3s ease, border-color 0.3s ease, background 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-6px);
  background: var(--card-hover);
  border-color: rgba(56, 189, 248, 0.35);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45), 0 0 40px rgba(56, 189, 248, 0.06);
}

.card-icon {
  width: 56px; height: 56px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--grad-soft);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: var(--cyan);
  margin-bottom: 22px;
}

.card-icon svg { width: 26px; height: 26px; }

/* ---------- 核心功能 ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card { padding: 32px 28px; }

.feature-card h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 12px;
  color: #fff;
}

.feature-card p {
  font-size: 14.5px;
  color: var(--text-dim);
}

/* ---------- 平台优势 ---------- */
.why-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.why-card { padding: 32px 26px; position: relative; overflow: hidden; }

.why-num {
  position: absolute;
  top: 14px; right: 22px;
  font-size: 44px;
  font-weight: 800;
  color: rgba(255, 255, 255, 0.05);
  line-height: 1;
}

.why-card h3 {
  font-size: 17.5px;
  font-weight: 700;
  margin-bottom: 10px;
  color: #fff;
}

.why-card p {
  font-size: 14px;
  color: var(--text-dim);
}

.why-card .card-icon { margin-bottom: 18px; }

/* ---------- 应用场景 ---------- */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.scenario-card {
  display: block;
  padding: 30px 28px;
  border-radius: var(--radius);
  background: var(--card);
  border: 1px solid var(--border);
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.scenario-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(320px 160px at 20% 0%, rgba(56, 189, 248, 0.12), transparent 70%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.scenario-card:hover {
  transform: translateY(-6px);
  border-color: rgba(139, 92, 246, 0.4);
  background: var(--card-hover);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
}
.scenario-card:hover::before { opacity: 1; }

.scenario-icon {
  width: 50px; height: 50px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(139, 92, 246, 0.1);
  border: 1px solid rgba(139, 92, 246, 0.28);
  color: #a78bfa;
  margin-bottom: 18px;
  transition: all 0.3s ease;
}
.scenario-card:hover .scenario-icon {
  background: var(--grad);
  color: #04121c;
  border-color: transparent;
}

.scenario-icon svg { width: 24px; height: 24px; }

.scenario-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

.scenario-card p {
  font-size: 14px;
  color: var(--text-dim);
  margin-bottom: 16px;
}

.scenario-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--cyan);
  transition: gap 0.25s ease;
}
.scenario-more svg { width: 15px; height: 15px; }
.scenario-card:hover .scenario-more { gap: 10px; }

/* ---------- 平台架构 ---------- */
.arch-img-wrap {
  max-width: 1100px;
  margin: 0 auto 32px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--card);
  backdrop-filter: blur(10px);
  overflow: hidden;
  transition: border-color 0.3s ease;
}

.arch-img-wrap:hover { border-color: rgba(56, 189, 248, 0.4); }

.arch-img {
  display: block;
  width: 100%;
  height: auto;
}

.arch-base-bar {
  max-width: 1100px;
  margin: 28px auto 0;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 28px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--card);
  backdrop-filter: blur(10px);
  transition: border-color 0.3s ease;
}

.arch-base-bar:hover { border-color: rgba(56, 189, 248, 0.4); }

.arch-base-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.15), rgba(139, 92, 246, 0.15));
  color: var(--cyan);
  flex-shrink: 0;
}

.arch-base-icon svg { width: 22px; height: 22px; }

.arch-base-text {
  flex: 1;
  font-size: 15px;
  color: var(--text);
  line-height: 1.5;
}

.arch-base-text strong {
  color: #fff;
  font-weight: 700;
  font-size: 16px;
}

.arch-base-tags {
  display: flex;
  gap: 10px;
  flex-shrink: 0;
}

.arch-base-tag {
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1px;
  color: var(--cyan);
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid rgba(34, 211, 238, 0.25);
}

@media (max-width: 768px) {
  .arch-base-bar {
    flex-direction: column;
    text-align: center;
    gap: 12px;
    padding: 20px 24px;
  }
  .arch-base-tags { flex-wrap: wrap; justify-content: center; }
}

/* ---------- 定价 ---------- */
.price-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
  align-items: stretch;
}

.price-card {
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
}

.price-hot {
  border-color: rgba(56, 189, 248, 0.45);
  background: linear-gradient(170deg, rgba(34, 211, 238, 0.07), rgba(139, 92, 246, 0.07));
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5), 0 0 50px rgba(56, 189, 248, 0.1);
  transform: translateY(-14px);
}

.price-hot:hover { transform: translateY(-20px); }

.price-badge {
  position: absolute;
  top: 0; left: 50%;
  transform: translate(-50%, -50%);
  padding: 6px 20px;
  border-radius: 999px;
  background: var(--grad);
  color: #04121c;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 1px;
  box-shadow: 0 8px 24px rgba(56, 189, 248, 0.4);
}

.price-name {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--text-dim);
  margin-bottom: 14px;
}

.price-amount {
  font-size: 44px;
  font-weight: 800;
  color: #fff;
  line-height: 1.15;
  margin-bottom: 6px;
}

.price-cur { font-size: 20px; vertical-align: 16px; margin-right: 2px; }
.price-unit { font-size: 14px; font-weight: 500; color: var(--text-faint); margin-left: 4px; }

.price-desc {
  font-size: 14px;
  color: var(--text-dim);
  margin-bottom: 24px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border);
}

.price-list {
  display: flex;
  flex-direction: column;
  gap: 13px;
  margin-bottom: 30px;
  flex: 1;
}

.price-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14.5px;
  color: var(--text);
}

.price-list li svg {
  width: 17px; height: 17px;
  color: var(--cyan);
  flex-shrink: 0;
  margin-top: 4px;
}

/* ---------- FAQ ---------- */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  backdrop-filter: blur(10px);
  overflow: hidden;
  transition: border-color 0.3s ease;
}

.faq-item:hover { border-color: rgba(56, 189, 248, 0.3); }

.faq-item[open] { border-color: rgba(139, 92, 246, 0.4); }

.faq-item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  user-select: none;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary svg {
  width: 18px; height: 18px;
  color: var(--text-dim);
  flex-shrink: 0;
  transition: transform 0.3s ease;
}

.faq-item[open] summary svg { transform: rotate(180deg); color: var(--cyan); }

.faq-item p {
  padding: 0 24px 22px;
  font-size: 14.5px;
  color: var(--text-dim);
  line-height: 1.85;
}

/* ---------- CTA ---------- */
.cta-section { padding-bottom: 110px; }

.cta-box {
  position: relative;
  text-align: center;
  padding: 80px 40px;
  border-radius: 26px;
  background: linear-gradient(160deg, rgba(34, 211, 238, 0.08), rgba(139, 92, 246, 0.1));
  border: 1px solid rgba(139, 92, 246, 0.3);
  overflow: hidden;
}

.cta-glow {
  position: absolute;
  width: 520px; height: 520px;
  left: 50%; top: -260px;
  transform: translateX(-50%);
  background: radial-gradient(circle, rgba(56, 189, 248, 0.18), transparent 65%);
  pointer-events: none;
}

.cta-title {
  position: relative;
  font-size: clamp(22px, 3.4vw, 40px);
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
  white-space: nowrap;
}

.cta-desc {
  position: relative;
  font-size: 16.5px;
  color: var(--text-dim);
  margin-bottom: 34px;
}

.cta-actions {
  position: relative;
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 26px;
}

.cta-note {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 13.5px;
  color: var(--text-faint);
}
.cta-note svg { width: 15px; height: 15px; color: #34d399; }

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(10, 15, 30, 0.6), rgba(5, 7, 15, 1));
  padding: 70px 28px 30px;
}

.footer-inner { max-width: 1200px; margin: 0 auto; }

.footer-top {
  display: grid;
  grid-template-columns: 1.2fr 2fr;
  gap: 60px;
  padding-bottom: 46px;
}

.footer-desc {
  margin: 20px 0 24px;
  font-size: 14.5px;
  color: var(--text-dim);
  max-width: 320px;
}

.footer-social {
  display: flex;
  gap: 12px;
}

.footer-social a {
  width: 40px; height: 40px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  transition: all 0.25s ease;
}
.footer-social a:hover {
  color: var(--cyan);
  border-color: rgba(56, 189, 248, 0.4);
  transform: translateY(-3px);
}
.footer-social svg { width: 19px; height: 19px; }

.footer-cols {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 18px;
  letter-spacing: 1px;
}

.footer-col a,
.footer-col span {
  display: block;
  font-size: 14px;
  color: var(--text-dim);
  margin-bottom: 12px;
  transition: color 0.2s ease;
}

.footer-col a:hover { color: var(--cyan); }

.footer-addr { color: var(--text-faint) !important; font-size: 13.5px !important; }

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-top: 26px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-faint);
}

.footer-legal { display: flex; gap: 22px; flex-wrap: wrap; }
.footer-legal a { transition: color 0.2s ease; }
.footer-legal a:hover { color: var(--cyan); }

/* ---------- 滚动渐入动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(34px);
  transition: opacity 0.8s cubic-bezier(0.2, 0.6, 0.2, 1), transform 0.8s cubic-bezier(0.2, 0.6, 0.2, 1);
  will-change: opacity, transform;
}

.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1200px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 1024px) {
  .brand-sub { display: none; }
  .hero-inner { grid-template-columns: 1fr; gap: 72px; }
  .hero-copy { text-align: center; }
  .hero-desc { margin-left: auto; margin-right: auto; }
  .hero-cta, .hero-tags { justify-content: center; }
  .demo-wrap { max-width: 560px; margin: 0 auto; width: 100%; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .scenario-grid { grid-template-columns: repeat(2, 1fr); }
  .price-grid { grid-template-columns: 1fr; max-width: 440px; margin: 0 auto; }
  .price-hot { transform: none; }
  .price-hot:hover { transform: translateY(-6px); }
  .footer-top { grid-template-columns: 1fr; gap: 40px; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); gap: 26px; }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    background: rgba(5, 7, 15, 0.97);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 14px 20px 22px;
    transform: translateY(-16px);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
  }
  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-links a { padding: 13px 16px; font-size: 15.5px; }
  .nav-actions .btn-ghost { display: none; }
  .nav-toggle { display: flex; }
  .brand-sub { display: none; }
  .section { padding: 80px 20px; }
  .section-title, .cta-title { font-size: 24px; }
  .hero { padding: calc(var(--nav-h) + 30px) 20px 80px; }
  .arch-grid { grid-template-columns: repeat(2, 1fr); }
  .arch-base-bar { flex-direction: column; text-align: center; gap: 12px; padding: 20px 24px; }
  .arch-base-tag { align-self: center; }
  .hero-scroll { display: none; }
  .cta-box { padding: 56px 24px; }
}

@media (max-width: 520px) {
  .feature-grid, .why-grid, .scenario-grid, .stats-inner { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: repeat(2, 1fr); }
  .hero-cta .btn { width: 100%; }
  .cta-actions .btn { width: 100%; }
  .brand-sub { display: none; }
  .nav-inner { padding: 0 18px; }
  .demo-chip.chip-1 { right: 0; }
  .demo-chip.chip-2 { left: 0; }
  .price-card { padding: 30px 22px; }
  .hero-badge { font-size: 12px; padding: 7px 14px; gap: 8px; letter-spacing: 0; }
  .section-title, .cta-title { font-size: 17px; }
}

/* ---------- 视频中心：平铺视频墙 ---------- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.video-card {
  border-radius: var(--radius);
  background: var(--card);
  border: 1px solid var(--border);
  overflow: hidden;
  cursor: pointer;
  backdrop-filter: blur(10px);
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.video-card:hover {
  transform: translateY(-6px);
  border-color: rgba(34, 211, 238, 0.4);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45), 0 0 40px rgba(34, 211, 238, 0.07);
}

.video-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  background:
    radial-gradient(120% 100% at 50% 0%, rgba(56, 189, 248, 0.14), transparent 60%),
    radial-gradient(90% 80% at 80% 100%, rgba(139, 92, 246, 0.16), transparent 60%),
    linear-gradient(160deg, #0d1428, #0a0f1e);
  overflow: hidden;
}

.video-frame video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  background: transparent;
}

/* 底部信息条 */
.video-meta {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 28px 14px 12px;
  background: linear-gradient(to top, rgba(4, 8, 18, 0.92) 30%, rgba(4, 8, 18, 0.4) 70%, transparent);
}

.video-meta h3 {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 4px;
  line-height: 1.4;
}

.video-meta p {
  font-size: 12px;
  color: rgba(226, 232, 240, 0.75);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-tag {
  display: inline-block;
  margin-bottom: 6px;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1px;
  color: var(--cyan);
  background: rgba(5, 7, 15, 0.7);
  border: 1px solid rgba(34, 211, 238, 0.3);
  backdrop-filter: blur(8px);
}

/* 悬停控制区 */
.video-hover {
  position: absolute;
  inset: 0;
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: rgba(5, 9, 20, 0.55);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.video-card:hover .video-hover {
  opacity: 1;
}

.video-sound {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--grad);
  color: #04121c;
  border: none;
  cursor: pointer;
  box-shadow: 0 8px 26px rgba(56, 189, 248, 0.4);
  transition: transform 0.3s ease;
}

.video-sound:hover {
  transform: scale(1.12);
}

.video-sound svg {
  width: 20px;
  height: 20px;
}

.video-sound .icon-sound .wave {
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
}

.video-sound .icon-muted {
  display: none;
}

.video-sound.is-muted .icon-sound {
  display: none;
}

.video-sound.is-muted .icon-muted {
  display: block;
}

.video-expand {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  color: #fff;
  background: rgba(5, 7, 15, 0.7);
  border: 1px solid rgba(148, 163, 184, 0.35);
  backdrop-filter: blur(8px);
  transition: border-color 0.3s ease, background 0.3s ease;
}

.video-card:hover .video-expand {
  border-color: rgba(34, 211, 238, 0.6);
  background: rgba(5, 7, 15, 0.85);
}

.video-expand svg {
  width: 14px;
  height: 14px;
}

.video-shine {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(115deg, transparent 30%, rgba(255, 255, 255, 0.06) 45%, transparent 60%);
  background-size: 250% 100%;
  animation: shine-move 5s ease-in-out infinite;
  pointer-events: none;
}

@keyframes shine-move {
  0% { background-position: 130% 0; }
  55% { background-position: -30% 0; }
  100% { background-position: -30% 0; }
}

/* 放大播放弹层 */
.video-lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  visibility: hidden;
  opacity: 0;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.video-lightbox.open {
  visibility: visible;
  opacity: 1;
}

.lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(2, 4, 12, 0.88);
  backdrop-filter: blur(12px);
}

.lightbox-body {
  position: relative;
  z-index: 1;
  width: min(960px, 94vw);
  border-radius: var(--radius);
  overflow: hidden;
  background: #060a16;
  border: 1px solid rgba(34, 211, 238, 0.25);
  box-shadow: 0 40px 120px rgba(0, 0, 0, 0.7), 0 0 60px rgba(56, 189, 248, 0.1);
  transform: scale(0.94) translateY(12px);
  transition: transform 0.35s ease;
}

.video-lightbox.open .lightbox-body {
  transform: scale(1) translateY(0);
}

.lightbox-body video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
}

.lightbox-close {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 2;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(5, 7, 15, 0.75);
  border: 1px solid rgba(148, 163, 184, 0.35);
  color: #fff;
  cursor: pointer;
  transition: border-color 0.3s ease, transform 0.3s ease;
}

.lightbox-close:hover {
  border-color: rgba(34, 211, 238, 0.6);
  transform: scale(1.08);
}

.lightbox-close svg {
  width: 18px;
  height: 18px;
}

.lightbox-title {
  padding: 14px 20px 18px;
  font-size: 15px;
  font-weight: 700;
  color: #fff;
}

/* ---------- 对接直播间入口 ---------- */
.live-entry {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-top: 26px;
  padding: 26px 32px;
  border-radius: var(--radius);
  background:
    radial-gradient(120% 140% at 0% 0%, rgba(34, 211, 238, 0.12), transparent 55%),
    radial-gradient(110% 130% at 100% 100%, rgba(139, 92, 246, 0.14), transparent 55%),
    var(--card);
  border: 1px solid rgba(34, 211, 238, 0.28);
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.live-entry:hover {
  border-color: rgba(34, 211, 238, 0.5);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4), 0 0 40px rgba(34, 211, 238, 0.08);
}

.live-badge {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 2px;
  color: #fff;
  background: linear-gradient(135deg, #f43f5e, #e11d48);
  box-shadow: 0 0 24px rgba(244, 63, 94, 0.45);
}

.live-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #fff;
  animation: live-pulse 1.6s ease-in-out infinite;
}

@keyframes live-pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.5); opacity: 0.45; }
}

.live-info {
  flex: 1;
  min-width: 0;
}

.live-info h3 {
  font-size: 18px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 6px;
  white-space: nowrap;
}

.live-info p {
  font-size: 14px;
  color: var(--text-dim);
  line-height: 1.6;
}

.live-btn {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 26px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  background: var(--grad);
  box-shadow: 0 10px 30px rgba(34, 211, 238, 0.25);
  transition: transform 0.3s ease, box-shadow 0.3s ease, filter 0.3s ease;
  white-space: nowrap;
}

.live-btn svg {
  width: 17px;
  height: 17px;
  transition: transform 0.3s ease;
}

.live-btn:hover {
  transform: translateY(-3px);
  filter: brightness(1.1);
  box-shadow: 0 16px 40px rgba(34, 211, 238, 0.35);
}

.live-btn:hover svg {
  transform: translateX(4px);
}

@media (max-width: 1024px) {
  .video-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .video-grid { grid-template-columns: 1fr; }
  .live-entry {
    flex-direction: column;
    align-items: stretch;
    text-align: center;
    gap: 18px;
    padding: 28px 22px;
  }
  .live-badge { align-self: center; }
  .live-btn { justify-content: center; }
}

/* ---------- 减少动效偏好 ---------- */
@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; }
}