/* ============================================================
   蓬莱官网 - 最终融合版设计稿
   方案B框架（温暖明亮风+衬线体+数据计数+创始人故事前置）
   + 方案A动态架构图（八仙过海SVG发光连线动画+粒子效果）
   ============================================================ */

/* --- Design Tokens --- */
:root {
  --bg-primary: #FAFAF7;
  --bg-secondary: #F3F2EE;
  --bg-tertiary: #EDEAE4;
  --surface: #FFFFFF;
  --surface-hover: #FAFAF7;
  --border: #E5E2DB;
  --border-hover: #D0CBC2;

  --text-primary: #1A1A1A;
  --text-secondary: #5A5A55;
  --text-muted: #8A8A82;

  --accent-primary: #C44531;
  --accent-primary-hover: #A8382A;
  --accent-secondary: #1685A9;
  --accent-secondary-hover: #126A87;
  --accent-gold: #B98A2E;
  --accent-gold-light: #F5E6C0;

  --gradient-brand: linear-gradient(135deg, #C44531, #D4654F);
  --gradient-warm: linear-gradient(135deg, #F5E6C0, #FAFAF7);

  --shadow-sm: 0 1px 3px rgba(26,26,26,0.04);
  --shadow-md: 0 4px 12px rgba(26,26,26,0.06), 0 1px 3px rgba(26,26,26,0.04);
  --shadow-lg: 0 12px 40px rgba(26,26,26,0.08), 0 4px 12px rgba(26,26,26,0.04);
  --shadow-accent: 0 8px 24px rgba(196,69,49,0.15);

  --font-serif: 'Source Han Serif SC', 'Noto Serif SC', Georgia, 'Songti SC', serif;
  --font-sans: -apple-system, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', monospace;

  --nav-height: 64px;
  --max-width: 1200px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 999px;
}

/* --- Reset & Base --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.75;
  color: var(--text-primary);
  background: linear-gradient(180deg,
    #FAFAF7 0%,
    #F5F2EC 15%,
    #EEEAE2 40%,
    #E5E0D6 65%,
    #DDD8CC 85%,
    #D5D0C4 100%
  );
  background-attachment: fixed;
  overflow-x: hidden;
  position: relative;
}

a {
  color: var(--accent-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--accent-secondary-hover);
}

img {
  max-width: 100%;
  height: auto;
}

::selection {
  background: rgba(196, 69, 49, 0.15);
  color: var(--text-primary);
}

/* --- Scroll Reveal Animation --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  html { scroll-behavior: auto; }
  .flow-line {
    animation: none !important;
  }
  .arch-node-glow {
    animation: none !important;
  }
  .glow-orb {
    animation: none !important;
  }
  .fog, .mountain-layer {
    animation: none !important;
    opacity: 0.8 !important;
  }
}

/* --- 仙山雾气背景层（每个元素独立 position:fixed，不依赖任何父容器） --- */

/* 山峦 SVG - fixed 底部 */
.mountain-layer {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100vw;
  height: 40vh;
  pointer-events: none;
  z-index: 0;
}

/* 雾气基础样式 - 全部 fixed 定位 */
.fog {
  position: fixed;
  pointer-events: none;
  will-change: transform, opacity;
  z-index: 0;
}

/* ---- 近景浓雾（底部，最可见） ---- */
.fog-1 {
  width: 250vw; height: 35vh;
  background: rgba(190, 200, 210, 0.35);
  filter: blur(90px);
  bottom: 5%; left: -50%;
  animation: fogDrift1 80s linear infinite;
}
.fog-2 {
  width: 220vw; height: 30vh;
  background: rgba(210, 200, 190, 0.30);
  filter: blur(100px);
  bottom: 15%; left: -30%;
  animation: fogDrift2 65s linear infinite;
}
.fog-3 {
  width: 280vw; height: 32vh;
  background: rgba(180, 195, 205, 0.32);
  filter: blur(95px);
  bottom: 0%; left: -60%;
  animation: fogDrift3 90s linear infinite;
}

/* ---- 中景雾气（中部） ---- */
.fog-4 {
  width: 200vw; height: 25vh;
  background: rgba(195, 205, 215, 0.22);
  filter: blur(80px);
  top: 45%; left: -20%;
  animation: fogDrift4 70s linear infinite;
}
.fog-5 {
  width: 180vw; height: 22vh;
  background: rgba(215, 205, 195, 0.20);
  filter: blur(85px);
  top: 55%; left: -40%;
  animation: fogDrift5 85s linear infinite;
}

/* ---- 远景薄雾（顶部，最淡） ---- */
.fog-6 {
  width: 160vw; height: 18vh;
  background: rgba(200, 210, 220, 0.15);
  filter: blur(70px);
  top: 20%; left: -10%;
  animation: fogDrift6 100s linear infinite;
}
.fog-7 {
  width: 170vw; height: 15vh;
  background: rgba(205, 200, 210, 0.12);
  filter: blur(65px);
  top: 10%; left: -30%;
  animation: fogDrift7 110s linear infinite;
}

/* ---- 额外的高光仙气（穿插，有明暗呼吸） ---- */
.fog-8 {
  width: 120vw; height: 40vh;
  background: rgba(200, 195, 185, 0.25);
  filter: blur(80px);
  top: 35%; left: -10%;
  animation: fogBreath 20s ease-in-out infinite;
}
.fog-9 {
  width: 100vw; height: 30vh;
  background: rgba(175, 190, 205, 0.20);
  filter: blur(70px);
  top: 25%; left: 5%;
  animation: fogBreath 25s ease-in-out infinite 5s;
}
.fog-10 {
  width: 110vw; height: 25vh;
  background: rgba(190, 200, 190, 0.18);
  filter: blur(75px);
  bottom: 25%; left: 15%;
  animation: fogBreath 18s ease-in-out infinite 10s;
}

/* ---- 漂移方向各异 ---- */
@keyframes fogDrift1 { 0%, 100% { transform: translateX(0); } 50% { transform: translateX(15%); } }
@keyframes fogDrift2 { 0%, 100% { transform: translateX(0); } 50% { transform: translateX(-12%); } }
@keyframes fogDrift3 { 0%, 100% { transform: translateX(0); } 50% { transform: translateX(10%); } }
@keyframes fogDrift4 { 0%, 100% { transform: translateX(0); } 50% { transform: translateX(-10%); } }
@keyframes fogDrift5 { 0%, 100% { transform: translateX(0); } 50% { transform: translateX(8%); } }
@keyframes fogDrift6 { 0%, 100% { transform: translateX(0); } 50% { transform: translateX(-6%); } }
@keyframes fogDrift7 { 0%, 100% { transform: translateX(0); } 50% { transform: translateX(9%); } }

/* ---- 呼吸明暗 ---- */
@keyframes fogBreath {
  0%, 100% { opacity: 0.5; transform: scale(1) translateX(0); }
  50% { opacity: 1; transform: scale(1.08) translateX(3%); }
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: var(--nav-height);
  transition: box-shadow 0.3s ease;
}

.nav.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
}

.nav-logo-seal {
  width: 36px;
  height: 36px;
  background: var(--accent-primary);
  color: white;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 20px;
  flex-shrink: 0;
}

.nav-logo-text {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 18px;
  letter-spacing: 0.02em;
}

.nav-logo-text span {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 14px;
  color: var(--text-secondary);
  margin-left: 6px;
  letter-spacing: 0.08em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s ease;
  position: relative;
}

.nav-links a:hover {
  color: var(--text-primary);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-primary);
  transition: width 0.3s ease;
  border-radius: 1px;
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-lang {
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: background 0.2s ease;
}

.nav-lang:hover {
  background: var(--bg-secondary);
  color: var(--text-secondary);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-primary);
  color: white;
  font-size: 14px;
  font-weight: 600;
  padding: 8px 20px;
  border-radius: var(--radius-pill);
  transition: all 0.25s ease;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
}

.nav-cta:hover {
  background: var(--accent-primary-hover);
  transform: scale(1.02);
  box-shadow: var(--shadow-accent);
  color: white;
}

/* Mobile menu toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--text-primary);
}

.nav-toggle svg {
  width: 24px;
  height: 24px;
}

/* ============================================================
   Hero Section (方案B框架 + 方案A Canvas粒子)
   ============================================================ */
/* ---- 仙山雾气背景层 ---- */
.hero {
  padding: 140px 32px 80px;
  text-align: center;
  background: transparent;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  /* 简单暖色光晕 */
  background:
    radial-gradient(ellipse 60% 35% at 15% 55%, rgba(196, 69, 49, 0.04) 0%, transparent 70%),
    radial-gradient(ellipse 50% 30% at 85% 45%, rgba(22, 133, 169, 0.05) 0%, transparent 70%),
    radial-gradient(ellipse 80% 25% at 50% 65%, rgba(185, 138, 46, 0.03) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

/* 删除旧的 ::after 雾气层（已移到全页 #mist-bg canvas） */

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-primary);
  margin-bottom: 32px;
  box-shadow: var(--shadow-sm);
}

.hero-badge::before {
  content: '';
  width: 8px;
  height: 8px;
  background: #4CAF50;
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 72px;
  letter-spacing: 0.04em;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.2;
}

.hero-title-en {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 16px;
  letter-spacing: 0.3em;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 32px;
}

.hero-subtitle {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 22px;
  color: var(--text-primary);
  line-height: 1.6;
  margin-bottom: 24px;
}

.hero-values {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 40px;
}

.hero-values li {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.hero-ctas {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--gradient-brand);
  color: white;
  font-size: 16px;
  font-weight: 600;
  padding: 14px 32px;
  border-radius: var(--radius-pill);
  border: none;
  cursor: pointer;
  transition: all 0.25s ease;
  box-shadow: var(--shadow-accent);
  text-decoration: none;
}

.btn-primary:hover {
  transform: scale(1.03);
  box-shadow: 0 12px 32px rgba(196, 69, 49, 0.2);
  color: white;
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--accent-secondary);
  font-size: 16px;
  font-weight: 600;
  padding: 14px 32px;
  border-radius: var(--radius-pill);
  border: 1.5px solid var(--accent-secondary);
  cursor: pointer;
  transition: all 0.25s ease;
  text-decoration: none;
}

.btn-ghost:hover {
  background: rgba(22, 133, 169, 0.06);
  border-color: var(--accent-secondary-hover);
  color: var(--accent-secondary-hover);
  transform: scale(1.02);
}

.btn-text {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: color 0.2s ease;
  text-decoration: none;
}

.btn-text:hover {
  color: var(--text-primary);
}

/* Hero Preview Mockups */
.hero-preview {
  max-width: 1000px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-preview-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.hero-mockup {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hero-mockup:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg), 0 16px 48px rgba(26,26,26,0.1);
}

.mockup-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.mockup-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border);
}

.mockup-dot:nth-child(1) { background: #FF5F57; }
.mockup-dot:nth-child(2) { background: #FEBC2E; }
.mockup-dot:nth-child(3) { background: #28C840; }

.mockup-title {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
  margin-left: 8px;
}

.mockup-body {
  padding: 24px 16px;
  min-height: 180px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.mockup-body .mockup-line {
  height: 10px;
  background: var(--bg-tertiary);
  border-radius: 5px;
}

.mockup-body .mockup-line.short { width: 60%; }
.mockup-body .mockup-line.medium { width: 80%; }
.mockup-body .mockup-line.long { width: 95%; }

.mockup-body .mockup-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--gradient-warm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.mockup-body .mockup-chat {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mockup-bubble {
  padding: 8px 14px;
  border-radius: 12px;
  font-size: 12px;
  line-height: 1.5;
  max-width: 85%;
}

.mockup-bubble.user {
  background: var(--accent-primary);
  color: white;
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}

.mockup-bubble.bot {
  background: var(--bg-secondary);
  color: var(--text-primary);
  align-self: flex-start;
  border-bottom-left-radius: 4px;
}

.mockup-body .mockup-terminal {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.mockup-terminal .prompt {
  color: var(--accent-primary);
}

.mockup-terminal .cmd {
  color: var(--accent-secondary);
}

/* ============================================================
   Story Section
   ============================================================ */
.story {
  padding: 120px 32px;
  background: transparent;
}

.story-inner {
  max-width: 900px;
  margin: 0 auto;
}

.story-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-gold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 40px;
}

.story-label::before {
  content: '';
  width: 24px;
  height: 2px;
  background: var(--accent-gold);
}

.story-quote {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 600;
  line-height: 1.8;
  color: var(--text-primary);
  margin-bottom: 16px;
  position: relative;
  padding-left: 32px;
}

.story-quote::before {
  content: '\201C';
  position: absolute;
  left: -8px;
  top: -8px;
  font-size: 64px;
  color: var(--accent-primary);
  opacity: 0.2;
  font-family: var(--font-serif);
  line-height: 1;
}

.story-quote-2 {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 600;
  line-height: 1.8;
  color: var(--accent-primary);
  padding-left: 32px;
  position: relative;
  margin-bottom: 32px;
}

.story-quote-2::before {
  content: '\201C';
  position: absolute;
  left: -8px;
  top: -8px;
  font-size: 64px;
  color: var(--accent-primary);
  opacity: 0.15;
  font-family: var(--font-serif);
  line-height: 1;
}

.story-author {
  font-size: 16px;
  color: var(--text-secondary);
  font-weight: 500;
  padding-left: 32px;
  margin-bottom: 48px;
}

.story-origin {
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.story-origin p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 8px;
}

.story-origin p:last-child {
  margin-bottom: 0;
}

.story-origin strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* ============================================================
   Core Features Section
   ============================================================ */
.features {
  padding: 120px 32px;
  background: transparent;
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.section-title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 36px;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.3;
}

.section-desc {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* Metrics Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 64px;
}

.metric-card {
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.metric-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.metric-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-brand);
  border-radius: 4px 4px 0 0;
}

.metric-number {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 56px;
  color: var(--accent-primary);
  line-height: 1;
  margin-bottom: 8px;
}

.metric-label {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 18px;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.metric-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Detail Feature Cards */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.feature-card {
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.feature-card-header {
  display: flex;
  align-items: center;
  gap: 16px;
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--gradient-warm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
}

.feature-title {
  font-weight: 700;
  font-size: 18px;
  color: var(--text-primary);
}

.feature-desc {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  flex: 1;
}

.feature-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-secondary);
  transition: gap 0.2s ease;
}

.feature-link:hover {
  gap: 10px;
  color: var(--accent-secondary-hover);
}

/* ============================================================
   Channel Showcase Section
   ============================================================ */
.channels {
  padding: 120px 32px;
  background: transparent;
}

.channels-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}

.channel-card {
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.channel-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.channel-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
}

.channel-name {
  font-weight: 700;
  font-size: 17px;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.channel-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  margin-bottom: 12px;
}

.channel-status.verified {
  background: rgba(76, 175, 80, 0.1);
  color: #2E7D32;
}

.channel-status.pending {
  background: var(--accent-gold-light);
  color: var(--accent-gold);
}

.channel-voice {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.channel-cmd {
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--bg-tertiary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  word-break: break-all;
}

.channels-pending {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.channel-card-mini {
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px 16px;
  text-align: center;
  opacity: 0.7;
  transition: opacity 0.2s ease;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.channel-card-mini:hover {
  opacity: 1;
}

.channel-card-mini .channel-icon {
  width: 40px;
  height: 40px;
  font-size: 20px;
  margin-bottom: 10px;
}

.channel-card-mini .channel-name {
  font-size: 14px;
}

/* ============================================================
   Architecture Section - 「八仙过海」动态SVG（方案A适配亮色）
   ============================================================ */
.architecture {
  padding: 120px 32px;
  background: transparent;
  position: relative;
}

.architecture::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 800px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(22, 133, 169, 0.04) 0%, transparent 70%);
  pointer-events: none;
}

/* Architecture Diagram Container */
.arch-diagram {
  position: relative;
  max-width: 900px;
  margin: 0 auto 48px;
  height: 420px;
}

.arch-diagram svg {
  width: 100%;
  height: 100%;
}

/* ---- 方案A 动画：流动连线 ---- */
@keyframes flow-dash {
  to { stroke-dashoffset: -20; }
}

@keyframes node-pulse {
  0%, 100% { filter: drop-shadow(0 0 6px rgba(22, 133, 169, 0.15)); }
  50% { filter: drop-shadow(0 0 16px rgba(22, 133, 169, 0.35)); }
}

.flow-line {
  stroke-dasharray: 6 4;
  animation: flow-dash 1.5s linear infinite;
}

.arch-node-glow {
  animation: node-pulse 3s ease-in-out infinite;
}

/* Glow orb behind architecture */
.glow-orb {
  position: absolute;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(22, 133, 169, 0.08) 0%, transparent 70%);
  pointer-events: none;
  animation: float-orb 8s ease-in-out infinite;
}

@keyframes float-orb {
  0%, 100% { transform: translate(0, 0); }
  33% { transform: translate(20px, -15px); }
  66% { transform: translate(-15px, 10px); }
}

/* Code snippet panel (适配亮色背景) */
.arch-code {
  max-width: 700px;
  margin: 0 auto;
  background: #1A1A1A;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.arch-code-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  background: rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.arch-code-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.arch-code-dot:nth-child(1) { background: #FF5F57; }
.arch-code-dot:nth-child(2) { background: #FFBD2E; }
.arch-code-dot:nth-child(3) { background: #28CA42; }

.arch-code-bar span {
  font-size: 13px;
  color: #8A8A82;
  margin-left: 8px;
  font-family: var(--font-mono);
}

.arch-code-body {
  padding: 24px;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 2;
  color: #E8EDF2;
}

.arch-code-body .comment,
.arch-code-body .hash-comment {
  color: #556677;
}

.arch-code-body .command {
  color: #E8EDF2;
}

.arch-code-body .flag {
  color: #1CA3D4;
}

/* ============================================================
   Install Section
   ============================================================ */
.install {
  padding: 120px 32px;
  background: transparent;
}

.install-tabs {
  display: flex;
  justify-content: center;
  gap: 0;
  margin-bottom: 48px;
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 4px;
  width: fit-content;
  margin-left: auto;
  margin-right: auto;
  box-shadow: var(--shadow-sm);
}

.install-tab {
  padding: 10px 28px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius-pill);
  transition: all 0.25s ease;
  border: none;
  background: none;
  position: relative;
  z-index: 1;
}

.install-tab:hover {
  color: var(--text-primary);
}

.install-tab.active {
  color: var(--text-primary);
}

.tab-indicator {
  position: absolute;
  top: 4px;
  height: calc(100% - 8px);
  background: var(--bg-primary);
  border-radius: var(--radius-pill);
  transition: left 0.3s cubic-bezier(0.22, 1, 0.36, 1),
              width 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  box-shadow: var(--shadow-sm);
  z-index: 0;
}

.install-panel {
  max-width: 700px;
  margin: 0 auto;
  display: none;
}

.install-panel.active {
  display: block;
}

.install-steps {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.install-step {
  display: flex;
  gap: 20px;
  padding: 24px 28px;
  border-bottom: 1px solid var(--border);
}

.install-step:last-child {
  border-bottom: none;
}

.step-number {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 2px;
}

.step-content {
  flex: 1;
}

.step-text {
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.7;
  margin-bottom: 12px;
}

.code-block {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  overflow-x: auto;
  position: relative;
}

.code-block .copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  font-size: 11px;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font-sans);
}

.code-block .copy-btn:hover {
  background: var(--bg-secondary);
  color: var(--text-secondary);
}

/* ============================================================
   Trust Section
   ============================================================ */
.trust {
  padding: 100px 32px;
  background: transparent;
  text-align: center;
}

.trust-inner {
  max-width: 700px;
  margin: 0 auto;
}

.trust-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 24px;
}

.trust-quote {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.7;
  margin-bottom: 48px;
}

.trust-credits {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

.trust-credit {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: border-color 0.2s ease;
}

.trust-credit:hover {
  border-color: var(--border-hover);
}

/* ============================================================
   Footer
   ============================================================ */
.footer {
  padding: 64px 32px 48px;
  background: rgba(237, 234, 228, 0.85);
  border-top: 1px solid var(--border);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 48px;
}

.footer-left {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-seal {
  width: 48px;
  height: 48px;
  background: var(--accent-primary);
  color: white;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 24px;
}

.footer-brand {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 20px;
  color: var(--text-primary);
}

.footer-tagline {
  font-size: 14px;
  color: var(--text-muted);
  font-style: italic;
}

.footer-links {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}

.footer-links a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-right {
  text-align: right;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-license {
  font-size: 13px;
  color: var(--text-muted);
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 32px auto 0;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}

/* ============================================================
   Animated Counter
   ============================================================ */
.counter {
  display: inline-block;
}

/* --- Smooth scroll offset for fixed nav --- */
[id] {
  scroll-margin-top: calc(var(--nav-height) + 24px);
}

/* ============================================================
   Utility Classes
   ============================================================ */
.text-accent { color: var(--accent-primary); }
.text-secondary { color: var(--accent-secondary); }
.text-gold { color: var(--accent-gold); }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1200px) {
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .channels-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .channels-pending {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 56px;
  }

  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  /* Mobile menu */
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 16px 32px 24px;
    box-shadow: var(--shadow-md);
    gap: 16px;
  }

  .nav-links.open a::after {
    display: none;
  }

  .hero {
    padding: 100px 20px 48px;
  }

  .hero-title {
    font-size: 48px;
  }

  .hero-title-en {
    font-size: 13px;
    letter-spacing: 0.2em;
  }

  .hero-subtitle {
    font-size: 18px;
  }

  .hero-ctas {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-ctas .btn-primary,
  .hero-ctas .btn-ghost {
    justify-content: center;
  }

  .hero-preview-grid {
    grid-template-columns: 1fr;
  }

  .hero-mockup:last-child {
    display: none;
  }

  .story {
    padding: 80px 20px;
  }

  .story-quote {
    font-size: 20px;
    padding-left: 24px;
  }

  .story-quote-2 {
    font-size: 18px;
    padding-left: 24px;
  }

  .section-header {
    margin-bottom: 40px;
  }

  .section-title {
    font-size: 28px;
  }

  .features,
  .channels,
  .architecture,
  .install,
  .trust {
    padding: 80px 20px;
  }

  .metrics-grid {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  .metric-card {
    padding: 24px 20px;
  }

  .metric-number {
    font-size: 40px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .channels-grid {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  .channels-pending {
    grid-template-columns: 1fr 1fr;
  }

  .install-tabs {
    flex-direction: column;
    width: 100%;
    border-radius: var(--radius-md);
    padding: 4px;
  }

  .install-tab {
    text-align: center;
  }

  .tab-indicator {
    display: none;
  }

  .install-step {
    flex-direction: column;
    gap: 12px;
    padding: 20px;
  }

  .arch-diagram {
    height: 300px;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-right {
    text-align: left;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 40px;
  }

  .metrics-grid {
    grid-template-columns: 1fr;
  }

  .channels-grid,
  .channels-pending {
    grid-template-columns: 1fr;
  }

  .trust-credits {
    flex-direction: column;
    align-items: center;
  }
}