/* ========================================
   至初睿优 · 落地页主样式
   科技深色主题 #0A1628
   ======================================== */

/* --- CSS Variables --- */
:root {
  /* 背景色 */
  --bg-primary: #0A1628;
  --bg-secondary: #0F1F3A;
  --bg-card: #132244;
  --bg-card-hover: #1a2d55;
  --bg-glass: rgba(15, 31, 58, 0.85);

  /* 强调色 */
  --accent-blue: #1E90FF;
  --accent-cyan: #00D4FF;
  --accent-gradient: linear-gradient(135deg, #1E90FF, #00D4FF);
  --accent-gradient-h: linear-gradient(135deg, #00D4FF, #1E90FF);

  /* 文字色 */
  --text-primary: #FFFFFF;
  --text-secondary: #8BA3C7;
  --text-accent: #00D4FF;
  --text-muted: #5A7094;

  /* 功能色 */
  --glow-blue: rgba(30, 144, 255, 0.4);
  --glow-cyan: rgba(0, 212, 255, 0.3);
  --border-subtle: rgba(30, 144, 255, 0.15);
  --border-active: rgba(0, 212, 255, 0.4);

  /* 间距 */
  --section-min-height: 100vh;
  --content-max-width: 1200px;
  --container-padding: 2rem;

  /* 字体 */
  --font-family: 'Source Han Sans SC', 'Noto Sans SC', 'PingFang SC',
    'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  --font-hero: clamp(2.5rem, 5vw, 4.5rem);
  --font-section-title: clamp(2rem, 4vw, 3.2rem);
  --font-subtitle: clamp(1.1rem, 2vw, 1.5rem);
  --font-body: clamp(0.9rem, 1.2vw, 1.1rem);
  --font-caption: clamp(0.75rem, 1vw, 0.875rem);

  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* 过渡 */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.4s ease;
  --transition-slow: 0.6s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  overflow-x: hidden;
  scroll-padding-top: 80px;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  min-width: 320px;
}

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

button,
input {
  font: inherit;
}

:where(h1, h2, h3, h4, p, a, span, button, li) {
  overflow-wrap: break-word;
}

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.container {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* --- 粒子背景Canvas --- */
#particle-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* --- 导航栏 --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  transition: all var(--transition-normal);
}

.navbar.scrolled {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.6rem 2rem;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.1rem;
  font-weight: 700;
  min-width: 0;
}

.brand-text {
  white-space: nowrap;
}

.brand-icon {
  font-size: 1.4rem;
  color: var(--accent-cyan);
  text-shadow: 0 0 10px var(--glow-cyan);
}

.brand-icon-img {
  width: 18px;
  height: 18px;
  object-fit: contain;
  flex-shrink: 0;
  filter: drop-shadow(0 0 8px var(--glow-cyan));
}

.brand-text small {
  font-size: 0.65em;
  color: var(--text-secondary);
  font-weight: 400;
  letter-spacing: 0.1em;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  background: rgba(30, 144, 255, 0.08);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.nav-toggle span {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-toggle:hover {
  border-color: var(--accent-blue);
  background: rgba(30, 144, 255, 0.14);
}

.navbar.nav-open .nav-toggle span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.navbar.nav-open .nav-toggle span:nth-child(2) {
  opacity: 0;
}

.navbar.nav-open .nav-toggle span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  position: relative;
  padding: 0.3rem 0;
  transition: color var(--transition-fast);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  transition: width var(--transition-normal);
}

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

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

.nav-indicator {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.section-counter {
  font-variant-numeric: tabular-nums;
}

/* --- 进度条 --- */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: var(--accent-gradient);
  z-index: 1001;
  transition: width 0.1s linear;
  box-shadow: 0 0 10px var(--glow-blue);
}

/* --- 通用Section样式 --- */
.section {
  position: relative;
  min-height: var(--section-min-height);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
  padding: 6rem 0;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-tag {
  display: inline-block;
  font-size: var(--font-caption);
  color: var(--accent-cyan);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-weight: 600;
  margin-bottom: 1rem;
  padding: 0.3rem 1rem;
  border: 1px solid var(--border-subtle);
  border-radius: 100px;
  background: rgba(0, 212, 255, 0.05);
}

.section-title {
  font-size: var(--font-section-title);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #fff 40%, var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: var(--font-subtitle);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

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

/* --- 动画项初始状态 --- */
.anim-item {
  opacity: 0;
}

.anim-item.animated {
  opacity: 1;
}

/* ============================
   §0 Loading Screen
   ============================ */
.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-primary);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
}

.loading-content {
  text-align: center;
}

.loading-logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.loading-logo .logo-icon {
  font-size: 3rem;
  color: var(--accent-cyan);
  text-shadow: 0 0 30px var(--glow-cyan);
  animation: logo-pulse 1.5s ease-in-out infinite;
}

.loading-logo .logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.3em;
  color: var(--text-primary);
}

.loading-bar-track {
  width: 200px;
  height: 3px;
  background: var(--bg-card);
  border-radius: 10px;
  overflow: hidden;
  margin: 0 auto 1.5rem;
}

.loading-bar-fill {
  width: 0%;
  height: 100%;
  background: var(--accent-gradient);
  border-radius: 10px;
  transition: width 0.3s ease;
}

.loading-text {
  font-size: 0.85rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
}

@keyframes logo-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.7; transform: scale(1.05); }
}

/* ============================
   §1 Hero
   ============================ */
.hero-section {
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.15;
  filter: blur(2px);
}

.hero-bg-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(10, 22, 40, 0.5) 0%,
    rgba(10, 22, 40, 0.8) 50%,
    rgba(10, 22, 40, 1) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  padding: 0 var(--container-padding);
}

.hero-tag {
  font-size: var(--font-caption);
  color: var(--accent-cyan);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: var(--font-hero);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 1.5rem;
}

.title-line {
  display: block;
}

.title-highlight {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
}

.hero-slogan {
  font-size: clamp(1rem, 1.8vw, 1.3rem);
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 2rem;
}

.hero-badges {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.badge {
  padding: 0.4rem 1.2rem;
  background: rgba(30, 144, 255, 0.1);
  border: 1px solid var(--border-subtle);
  border-radius: 100px;
  font-size: 0.9rem;
  color: var(--accent-cyan);
  font-weight: 500;
}

.badge-dot {
  color: var(--text-muted);
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  padding: 0.8rem 2rem;
  background: var(--accent-gradient);
  color: white;
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 20px var(--glow-blue);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--glow-blue);
  color: white;
}

.btn-large {
  padding: 1rem 2.5rem;
  font-size: 1.1rem;
}

.btn-video {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.8rem 1.8rem;
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 1rem;
  transition: all var(--transition-fast);
}

.btn-video:hover {
  border-color: var(--accent-blue);
  background: rgba(30, 144, 255, 0.1);
}

.play-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent-gradient);
  font-size: 0.7rem;
  color: white;
}

.scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  z-index: 2;
}

.scroll-arrow {
  margin-top: 0.5rem;
  font-size: 1.2rem;
  animation: scroll-bounce 2s ease-in-out infinite;
}

@keyframes scroll-bounce {
  0%, 100% { transform: translateY(0); opacity: 1; }
  50% { transform: translateY(8px); opacity: 0.5; }
}

/* ============================
   §2 问题与价值
   ============================ */
.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-bottom: 3rem;
}

.problem-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  text-align: center;
  transition: all var(--transition-normal);
}

.problem-card:hover {
  border-color: var(--border-active);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.3);
}

.problem-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.problem-card h3 {
  font-size: 1.2rem;
  margin-bottom: 0.8rem;
  color: var(--text-primary);
}

.problem-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.solution-bridge {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin: 2rem 0;
}

.bridge-line {
  flex: 1;
  height: 1px;
  background: var(--accent-gradient);
  opacity: 0.4;
}

.bridge-text {
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent-cyan);
  letter-spacing: 0.2em;
  padding: 0.5rem 1.5rem;
  border: 1px solid var(--border-active);
  border-radius: 100px;
  background: rgba(0, 212, 255, 0.05);
}

.solution-summary {
  text-align: center;
}

.solution-text {
  font-size: var(--font-subtitle);
  color: var(--text-secondary);
}

.solution-text strong {
  color: var(--accent-cyan);
  font-weight: 700;
}

/* ============================
   §3 产品揭示
   ============================ */
.reveal-section {
  background: linear-gradient(180deg,
    var(--bg-primary) 0%,
    var(--bg-secondary) 50%,
    var(--bg-primary) 100%
  );
}

.reveal-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.reveal-image-wrap {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.reveal-image {
  width: 100%;
  border-radius: var(--radius-xl);
  transition: transform var(--transition-slow);
}

.reveal-image-wrap:hover .reveal-image {
  transform: scale(1.03);
}

.reveal-image-glow {
  position: absolute;
  inset: -2px;
  border-radius: var(--radius-xl);
  background: var(--accent-gradient);
  opacity: 0;
  z-index: -1;
  filter: blur(20px);
  transition: opacity var(--transition-normal);
}

.reveal-image-wrap:hover .reveal-image-glow {
  opacity: 0.3;
}

.reveal-text .section-tag {
  margin-bottom: 1rem;
}

.reveal-title {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.5rem;
}

.reveal-desc {
  font-size: var(--font-body);
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 2rem;
}

.reveal-stats {
  display: flex;
  gap: 2rem;
}

.stat-item {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 900;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-variant-numeric: tabular-nums;
}

.stat-text {
  display: block;
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--accent-cyan);
}

.stat-unit {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ============================
   §4 四大核心特性
   ============================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.feature-card:hover {
  border-color: var(--border-active);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon-wrap {
  position: relative;
  width: 60px;
  height: 60px;
  margin-bottom: 1.5rem;
}

.feature-icon {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  background: rgba(30, 144, 255, 0.1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  position: relative;
  z-index: 1;
}

.feature-icon-pulse {
  position: absolute;
  inset: -4px;
  border-radius: var(--radius-md);
  background: var(--accent-gradient);
  opacity: 0;
  animation: icon-pulse 3s ease-in-out infinite;
}

.feature-card:nth-child(2) .feature-icon-pulse { animation-delay: 0.5s; }
.feature-card:nth-child(3) .feature-icon-pulse { animation-delay: 1s; }
.feature-card:nth-child(4) .feature-icon-pulse { animation-delay: 1.5s; }

@keyframes icon-pulse {
  0%, 100% { opacity: 0; transform: scale(1); }
  50% { opacity: 0.15; transform: scale(1.1); }
}

.feature-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1rem;
}

.feature-tag {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--accent-cyan);
  padding: 0.25rem 0.8rem;
  border: 1px solid var(--border-subtle);
  border-radius: 100px;
  background: rgba(0, 212, 255, 0.05);
}

/* ============================
   §5 AI诊断能力 - 放射轨道
   ============================ */
.ai-orbit {
  position: relative;
  width: 100%;
  max-width: 600px;
  height: 600px;
  margin: 0 auto 4rem;
}

.orbit-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 3;
}

.orbit-core {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--bg-card) 0%, var(--bg-primary) 100%);
  border: 2px solid var(--accent-blue);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
  box-shadow: 0 0 40px var(--glow-blue), inset 0 0 30px rgba(30, 144, 255, 0.1);
}

.core-icon {
  font-size: 2rem;
}

.core-text {
  font-size: 0.75rem;
  font-weight: 600;
  text-align: center;
  line-height: 1.3;
  color: var(--accent-cyan);
}

.orbit-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 1px solid var(--border-subtle);
}

.orbit-ring-1 {
  width: 320px;
  height: 320px;
  animation: orbit-rotate 30s linear infinite;
}

.orbit-ring-2 {
  width: 480px;
  height: 480px;
  border-style: dashed;
  opacity: 0.5;
  animation: orbit-rotate 45s linear infinite reverse;
}

@keyframes orbit-rotate {
  from { transform: translate(-50%, -50%) rotate(0deg); }
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

.orbit-nodes {
  position: absolute;
  inset: 0;
}

.orbit-node {
  position: absolute;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-normal);
  /* 8个节点均匀分布在半径240px的圆上 */
  left: calc(50% + 240px * cos(calc(var(--i) * 45deg)) - 40px);
  top: calc(50% + 240px * sin(calc(var(--i) * 45deg)) - 40px);
}

.orbit-node:hover {
  border-color: var(--accent-cyan);
  background: var(--bg-card-hover);
  transform: scale(1.1);
  box-shadow: 0 0 20px var(--glow-cyan);
}

.node-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
}

.orbit-lines {
  position: absolute;
  inset: 0;
  z-index: 1;
}

.orbit-line {
  stroke: var(--accent-blue);
  stroke-width: 1;
  opacity: 0.2;
  stroke-dasharray: 300;
  stroke-dashoffset: 300;
}

.ai-capabilities {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  max-width: 900px;
  margin: 0 auto;
}

.capability-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
}

.capability-item:hover {
  border-color: var(--border-active);
  transform: translateY(-2px);
}

.cap-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.cap-info h4 {
  font-size: 1rem;
  margin-bottom: 0.3rem;
}

.cap-info p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ============================
   §6 三层可解释体系
   ============================ */
.explainable-section {
  background: linear-gradient(180deg,
    var(--bg-primary) 0%,
    var(--bg-secondary) 50%,
    var(--bg-primary) 100%
  );
}

.layers-flow {
  max-width: 700px;
  margin: 0 auto 3rem;
}

.layer-card {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.layer-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--accent-gradient);
}

.layer-card:hover {
  border-color: var(--border-active);
  transform: translateX(8px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.layer-number {
  font-size: 2.5rem;
  font-weight: 900;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  flex-shrink: 0;
  width: 60px;
  text-align: center;
}

.layer-content {
  flex: 1;
}

.layer-content h3 {
  font-size: 1.2rem;
  margin-bottom: 0.3rem;
}

.layer-content p {
  font-size: 0.9rem;
  color: var(--accent-cyan);
  margin-bottom: 0.5rem;
}

.layer-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.layer-badge {
  font-size: 0.7rem;
  color: var(--text-muted);
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--border-subtle);
  border-radius: 100px;
  white-space: nowrap;
}

.flow-connector {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0.5rem 0;
  margin-left: 2.5rem;
}

.connector-line {
  width: 2px;
  height: 20px;
  background: var(--accent-gradient);
  opacity: 0.4;
}

.connector-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 8px var(--glow-cyan);
}

.explainable-image {
  text-align: center;
  margin-top: 3rem;
}

.system-diagram {
  max-width: 800px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
}

/* ============================
   §7 硬件产品展示
   ============================ */
.hardware-showcase {
  margin-bottom: 3rem;
}

.hardware-tabs {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.hw-tab {
  padding: 0.6rem 1.5rem;
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.hw-tab:hover {
  border-color: var(--accent-blue);
  color: var(--text-primary);
}

.hw-tab.active {
  background: var(--accent-gradient);
  border-color: transparent;
  color: white;
  font-weight: 600;
}

.hardware-display {
  position: relative;
  min-height: 400px;
}

.hw-panel {
  display: none;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  animation: fadeInUp 0.5s ease;
}

.hw-panel.active {
  display: grid;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.hw-image {
  width: 100%;
  max-height: 400px;
  object-fit: contain;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  padding: 1rem;
}

.hw-info h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.hw-info p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.hw-specs {
  list-style: none;
}

.hw-specs li {
  padding: 0.5rem 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-subtle);
  position: relative;
  padding-left: 1.5rem;
}

.hw-specs li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
}

.hardware-all {
  text-align: center;
}

.hw-group-image {
  max-width: 800px;
  margin: 0 auto 1rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
}

.hw-caption {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ============================
   §8 工作流程（水平滚动）
   ============================ */
.workflow-section {
  padding: 0;
  min-height: auto;
  overflow: visible;
}

.workflow-wrapper {
  width: 100%;
}

.workflow-pin {
  padding: 4rem var(--container-padding);
  max-width: var(--content-max-width);
  margin: 0 auto;
}

.workflow-header {
  text-align: center;
  margin-bottom: 4rem;
}

.workflow-timeline {
  position: relative;
  margin-bottom: 4rem;
}

.timeline-track {
  position: absolute;
  top: 40px;
  left: 0;
  right: 0;
  height: 4px;
}

.timeline-line {
  width: 0%;
  height: 100%;
  background: var(--accent-gradient);
  border-radius: 10px;
  box-shadow: 0 0 10px var(--glow-blue);
  transition: width 0.6s ease;
}

.workflow-steps {
  display: flex;
  justify-content: space-between;
  position: relative;
  z-index: 2;
}

.workflow-step {
  text-align: center;
  flex: 1;
  padding: 0 0.5rem;
}

.step-number {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-cyan);
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.step-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 1rem;
  border-radius: 50%;
  background: var(--bg-card);
  border: 2px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  transition: all var(--transition-normal);
}

.workflow-step:hover .step-icon {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 20px var(--glow-cyan);
  transform: scale(1.1);
}

.workflow-step h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.workflow-step p {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.workflow-simple {
  text-align: center;
  padding: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
}

.workflow-simple h3 {
  font-size: 1.3rem;
  margin-bottom: 1.5rem;
  color: var(--accent-cyan);
}

.simple-steps {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.simple-step {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  background: rgba(30, 144, 255, 0.08);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  font-size: 0.95rem;
}

.simple-result {
  border-color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.1);
  font-weight: 600;
  color: var(--accent-cyan);
}

.simple-num {
  font-size: 1.2rem;
}

.simple-arrow {
  font-size: 1.2rem;
  color: var(--text-muted);
}

/* ============================
   §9 远程会诊
   ============================ */
.remote-showcase {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
  margin-bottom: 3rem;
  align-items: center;
}

.remote-panel {
  text-align: center;
}

.remote-mockup {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  margin-bottom: 1.5rem;
  transition: all var(--transition-normal);
}

.remote-panel:hover .remote-mockup {
  border-color: var(--border-active);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.3);
  transform: translateY(-4px);
}

.mockup-screen {
  overflow: hidden;
}

.remote-img {
  width: 100%;
  display: block;
}

.phone-mockup {
  max-width: 280px;
  margin: 0 auto 1.5rem;
  border-radius: var(--radius-xl);
}

.remote-panel h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.remote-panel p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.remote-features {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.rf-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.rf-item:hover {
  border-color: var(--border-active);
  color: var(--text-primary);
}

.rf-icon {
  font-size: 1.2rem;
}

/* ============================
   §10 品牌升华 + CTA
   ============================ */
.final-section {
  overflow: hidden;
}

.final-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.final-bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.12;
  filter: blur(3px);
}

.final-bg-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    var(--bg-primary) 0%,
    rgba(10, 22, 40, 0.85) 50%,
    var(--bg-primary) 100%
  );
}

.final-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  padding: 0 var(--container-padding);
}

.final-slogan {
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: 1.5rem;
}

.final-sub {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 3rem;
  letter-spacing: 0.1em;
}

.final-cta {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  padding: 0.8rem 2rem;
  background: transparent;
  border: 1px solid var(--border-active);
  color: var(--accent-cyan);
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-outline:hover {
  background: rgba(0, 212, 255, 0.1);
  box-shadow: 0 4px 20px var(--glow-cyan);
  color: var(--accent-cyan);
}

.final-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 1rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
}

.final-brand .brand-icon {
  font-size: 1.2rem;
}

/* --- Footer --- */
.footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border-subtle);
  text-align: center;
  position: relative;
  z-index: 1;
}

.footer p {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.8rem;
}

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

.footer-divider {
  color: var(--text-muted);
  margin: 0 0.5rem;
  opacity: 0.3;
}

/* ============================
   视频Modal
   ============================ */
.video-modal {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: none;
  align-items: center;
  justify-content: center;
}

.video-modal.active {
  display: flex;
}

.video-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(10px);
}

.video-modal-content {
  position: relative;
  width: 90%;
  max-width: 960px;
  z-index: 1;
}

.video-modal-content video {
  width: 100%;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
}

.video-modal-close {
  position: absolute;
  top: -40px;
  right: 0;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
  transition: color var(--transition-fast);
}

.video-modal-close:hover {
  color: var(--accent-cyan);
}

/* ============================
   预约试用表单 Modal
   ============================ */
.booking-modal {
  position: fixed;
  inset: 0;
  z-index: 10001;
  display: none;
  align-items: center;
  justify-content: center;
}

.booking-modal.active {
  display: flex;
}

.booking-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(12px);
}

.booking-modal-content {
  position: relative;
  width: 92%;
  max-width: 520px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  z-index: 1;
  animation: modalSlideUp 0.35s ease;
  max-height: 90vh;
  overflow-y: auto;
}

@keyframes modalSlideUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.booking-modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.3rem;
  cursor: pointer;
  padding: 0.3rem 0.5rem;
  transition: color var(--transition-fast);
  line-height: 1;
}

.booking-modal-close:hover {
  color: var(--accent-cyan);
}

.booking-header {
  text-align: center;
  margin-bottom: 2rem;
}

.booking-header h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.booking-header p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.booking-form {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.required {
  color: #ff6b6b;
  margin-left: 2px;
}

.form-group input {
  padding: 0.75rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  transition: all var(--transition-fast);
  outline: none;
}

.form-group input::placeholder {
  color: var(--text-muted);
}

.form-group input:focus {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(30, 144, 255, 0.15);
}

.form-group input.input-error {
  border-color: #ff6b6b;
  box-shadow: 0 0 0 3px rgba(255, 107, 107, 0.15);
}

.form-error {
  font-size: 0.78rem;
  color: #ff6b6b;
  min-height: 1.1em;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.btn-submit {
  padding: 0.85rem;
  background: var(--accent-gradient);
  color: white;
  font-weight: 700;
  font-size: 1rem;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  margin-top: 0.5rem;
}

.btn-submit:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--glow-blue);
}

.btn-submit:active {
  transform: translateY(0);
}

/* 提交成功 */
.booking-success {
  text-align: center;
  padding: 2rem 0;
}

.success-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--accent-gradient);
  color: white;
  font-size: 2rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  box-shadow: 0 0 30px var(--glow-blue);
}

.booking-success h3 {
  font-size: 1.4rem;
  margin-bottom: 0.8rem;
}

.booking-success p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
}

/* ============================
   管理后台
   ============================ */
.admin-page {
  min-height: 100vh;
  background: var(--bg-primary);
  padding: 2rem;
  position: relative;
  z-index: 1;
}

.admin-container {
  max-width: 1100px;
  margin: 0 auto;
}

.admin-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.admin-title {
  font-size: 1.5rem;
  font-weight: 700;
}

.admin-title small {
  font-size: 0.65em;
  color: var(--text-muted);
  font-weight: 400;
  margin-left: 0.5rem;
}

.admin-actions {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.btn-admin {
  padding: 0.5rem 1.2rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  color: var(--text-primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-admin:hover {
  border-color: var(--accent-blue);
  color: var(--accent-cyan);
}

.btn-admin.primary {
  background: var(--accent-gradient);
  border-color: transparent;
  color: white;
}

.btn-admin.primary:hover {
  box-shadow: 0 4px 15px var(--glow-blue);
  color: white;
}

.btn-admin.danger {
  border-color: rgba(255, 107, 107, 0.3);
  color: #ff6b6b;
}

.btn-admin.danger:hover {
  background: rgba(255, 107, 107, 0.1);
  border-color: #ff6b6b;
}

/* 统计卡片 */
.admin-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
}

.stat-card .stat-value {
  font-size: 2rem;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-card .stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.3rem;
}

/* 表格 */
.admin-table-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
}

.admin-table th {
  padding: 1rem 1.2rem;
  text-align: left;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
}

.admin-table td {
  padding: 1rem 1.2rem;
  font-size: 0.9rem;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-subtle);
}

.admin-table tr:last-child td {
  border-bottom: none;
}

.admin-table tr:hover td {
  background: rgba(30, 144, 255, 0.03);
}

.admin-table .col-index {
  width: 50px;
  color: var(--text-muted);
}

.admin-table .col-time {
  width: 160px;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.admin-table .col-actions {
  width: 80px;
  text-align: center;
}

.btn-delete {
  background: none;
  border: 1px solid rgba(255, 107, 107, 0.3);
  color: #ff6b6b;
  padding: 0.3rem 0.6rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.8rem;
  transition: all var(--transition-fast);
}

.btn-delete:hover {
  background: rgba(255, 107, 107, 0.15);
  border-color: #ff6b6b;
}

/* 空状态 */
.admin-empty {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
}

.admin-empty .empty-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.admin-empty p {
  font-size: 1rem;
  margin-bottom: 1.5rem;
}

/* ============================
   黑屏遮罩
   ============================ */
.black-mask {
  position: fixed;
  inset: 0;
  background: black;
  z-index: 9998;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.black-mask.active {
  opacity: 1;
  pointer-events: auto;
}

/* ============================
   快捷键提示
   ============================ */
.shortcuts-toast {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.9);
  z-index: 9999;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s ease;
  min-width: 360px;
}

.shortcuts-toast.active {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, -50%) scale(1);
}

.toast-content h4 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  text-align: center;
  color: var(--accent-cyan);
}

.shortcut-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.shortcut-grid span {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

kbd {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  font-family: monospace;
  font-size: 0.8rem;
  color: var(--accent-cyan);
  margin-right: 0.3rem;
}

/* ============================
   模式指示器
   ============================ */
.mode-indicator {
  position: fixed;
  top: 80px;
  right: 20px;
  z-index: 1002;
  padding: 0.4rem 1rem;
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-active);
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  color: var(--accent-cyan);
  opacity: 0;
  transform: translateX(20px);
  transition: all 0.3s ease;
  pointer-events: none;
}

.mode-indicator.active {
  opacity: 1;
  transform: translateX(0);
}

/* ============================
   响应式适配
   ============================ */
@media (max-width: 1024px) {
  html {
    scroll-padding-top: 72px;
  }

  .navbar,
  .navbar.scrolled {
    padding: 0.75rem 1rem;
    background: var(--bg-glass);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--border-subtle);
    gap: 0.75rem;
  }

  .nav-brand {
    flex: 1;
  }

  .nav-indicator {
    order: 2;
    flex-shrink: 0;
  }

  .nav-toggle {
    display: inline-flex;
    order: 3;
    flex-shrink: 0;
  }

  .nav-links {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 1rem;
    right: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0;
    padding: 0.45rem;
    background: rgba(15, 31, 58, 0.96);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    box-shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  }

  .navbar.nav-open .nav-links {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }

  .nav-links a {
    width: 100%;
    padding: 0.75rem 0.85rem;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
  }

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

  .nav-links a:hover,
  .nav-links a.active {
    background: rgba(30, 144, 255, 0.12);
  }

  .reveal-content {
    grid-template-columns: 1fr;
    gap: 2rem;
    text-align: center;
  }

  .problem-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
  }

  .features-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
  }

  .ai-orbit {
    height: 500px;
    max-width: 500px;
  }

  .orbit-node {
    width: 64px;
    height: 64px;
    left: calc(50% + 190px * cos(calc(var(--i) * 45deg)) - 32px);
    top: calc(50% + 190px * sin(calc(var(--i) * 45deg)) - 32px);
  }

  .ai-capabilities {
    grid-template-columns: 1fr;
    max-width: 400px;
  }

  .remote-showcase {
    grid-template-columns: 1fr;
  }

  .hw-panel {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  :root {
    --container-padding: 1rem;
    --section-min-height: auto;
    --font-hero: clamp(2.35rem, 11vw, 3.3rem);
    --font-section-title: clamp(1.85rem, 8vw, 2.5rem);
    --font-subtitle: clamp(1rem, 4.5vw, 1.2rem);
  }

  .section {
    min-height: auto;
    padding: 4.5rem 0;
    align-items: flex-start;
  }

  .section-header {
    margin-bottom: 2.25rem;
  }

  .section-tag {
    max-width: 100%;
    letter-spacing: 0.12em;
    line-height: 1.5;
    white-space: normal;
  }

  .section-title {
    line-height: 1.18;
  }

  .section-subtitle {
    line-height: 1.7;
  }

  .hero-section,
  .final-section {
    min-height: 100svh;
    align-items: center;
    padding-top: 6.5rem;
    padding-bottom: 4.5rem;
  }

  .hero-bg-img,
  .final-bg-img {
    opacity: 0.2;
    filter: blur(1px);
  }

  .hero-content,
  .final-content {
    width: 100%;
    max-width: 560px;
  }

  .hero-tag {
    letter-spacing: 0.12em;
    line-height: 1.6;
    margin-bottom: 1rem;
  }

  .hero-title {
    margin-bottom: 1.25rem;
  }

  .hero-slogan {
    line-height: 1.7;
    margin-bottom: 1.5rem;
  }

  .hero-badges {
    gap: 0.55rem;
    margin-bottom: 1.75rem;
  }

  .badge {
    padding: 0.35rem 0.8rem;
    font-size: 0.82rem;
  }

  .badge-dot {
    display: none;
  }

  .hero-actions,
  .final-cta {
    width: 100%;
    flex-direction: column;
    gap: 0.85rem;
  }

  .btn-primary,
  .btn-video,
  .btn-outline {
    width: 100%;
    max-width: 320px;
    min-height: 48px;
    justify-content: center;
  }

  .scroll-hint {
    display: none;
  }

  .problem-card,
  .feature-card {
    padding: 1.5rem 1.25rem;
    border-radius: var(--radius-md);
  }

  .solution-bridge {
    gap: 0.75rem;
  }

  .bridge-text {
    padding: 0.45rem 1rem;
    letter-spacing: 0.12em;
    white-space: nowrap;
  }

  .reveal-image-wrap,
  .reveal-image,
  .system-diagram,
  .hw-image,
  .hw-group-image,
  .remote-mockup {
    border-radius: var(--radius-md);
  }

  .reveal-stats {
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
  }

  .stat-item {
    flex: 1 1 92px;
    min-width: 92px;
  }

  .stat-number {
    font-size: 2rem;
  }

  .stat-text {
    font-size: 1.5rem;
  }

  .ai-orbit {
    display: grid;
    gap: 1rem;
    height: auto;
    max-width: 100%;
    margin-bottom: 2rem;
  }

  .orbit-center {
    position: static;
    transform: none;
    display: flex;
    justify-content: center;
  }

  .orbit-core {
    width: 112px;
    height: 112px;
  }

  .orbit-ring,
  .orbit-lines {
    display: none;
  }

  .orbit-nodes {
    position: static;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.75rem;
  }

  .orbit-node {
    position: static;
    width: auto;
    height: auto;
    min-height: 46px;
    padding: 0.65rem 0.5rem;
    border-radius: var(--radius-sm);
  }

  .orbit-node:hover {
    transform: translateY(-2px);
  }

  .node-label {
    font-size: 0.82rem;
    line-height: 1.3;
    text-align: center;
  }

  .ai-capabilities {
    max-width: 100%;
    gap: 0.85rem;
  }

  .capability-item {
    padding: 1.1rem;
  }

  .explainable-section .container,
  .hardware-section .container {
    width: 100%;
  }

  .layers-flow {
    width: 100%;
    margin-bottom: 2rem;
  }

  .layer-card {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    grid-template-areas:
      "number content"
      "badge content";
    column-gap: 0.9rem;
    row-gap: 0.5rem;
    align-items: flex-start;
    padding: 1.3rem 1.2rem;
    border-radius: var(--radius-md);
    overflow: visible;
    min-width: 0;
  }

  .layer-card:hover {
    transform: translateY(-2px);
  }

  .layer-number {
    grid-area: number;
    width: auto;
    font-size: 2rem;
    line-height: 1;
  }

  .layer-content {
    grid-area: content;
    width: 100%;
    min-width: 0;
  }

  .layer-content p,
  .layer-desc {
    line-height: 1.55;
    overflow-wrap: anywhere;
  }

  .layer-badge {
    align-self: flex-start;
  }

  .layer-visual {
    grid-area: badge;
    width: auto;
  }

  .flow-connector {
    margin-left: 0;
    padding: 0.35rem 0;
  }

  .explainable-image {
    margin-top: 2rem;
  }

  .system-diagram {
    width: 100%;
    height: min(54svh, 360px);
    object-fit: contain;
    padding: 0.5rem;
    background: var(--bg-card);
  }

  .hardware-tabs {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.6rem;
  }

  .hw-tab {
    min-height: 44px;
    padding: 0.55rem 0.7rem;
    font-size: 0.9rem;
  }

  .hardware-display {
    min-height: auto;
  }

  .hw-panel {
    text-align: center;
  }

  .hw-image {
    max-height: 260px;
    padding: 0.75rem;
  }

  .hw-info h3 {
    font-size: 1.3rem;
  }

  .hw-specs {
    text-align: left;
  }

  .hw-caption {
    padding: 0 0.5rem;
    line-height: 1.6;
  }

  .hardware-all {
    margin-top: 2rem;
  }

  .hw-group-image {
    width: 100%;
    height: min(64svh, 420px);
    object-fit: contain;
    padding: 0.5rem;
    background: var(--bg-card);
  }

  .workflow-pin {
    padding: 4.5rem var(--container-padding);
  }

  .workflow-header {
    margin-bottom: 2.25rem;
  }

  .workflow-timeline {
    margin-bottom: 2rem;
  }

  .workflow-steps {
    flex-direction: column;
    gap: 0.9rem;
  }

  .timeline-track {
    display: none;
  }

  .workflow-step {
    position: relative;
    min-height: 96px;
    padding: 1rem 1rem 1rem 4.9rem;
    text-align: left;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
  }

  .step-number {
    margin-bottom: 0.2rem;
  }

  .step-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    width: 52px;
    height: 52px;
    margin: 0;
    font-size: 1.45rem;
    transform: translateY(-50%);
  }

  .workflow-step:hover .step-icon {
    transform: translateY(-50%);
  }

  .workflow-simple {
    padding: 1.4rem 1rem;
    border-radius: var(--radius-md);
  }

  .simple-steps {
    flex-direction: column;
    align-items: stretch;
    gap: 0.65rem;
  }

  .simple-step {
    justify-content: center;
    width: 100%;
  }

  .simple-arrow {
    transform: rotate(90deg);
    line-height: 1;
  }

  .remote-showcase {
    gap: 2rem;
    margin-bottom: 2rem;
  }

  .phone-mockup {
    max-width: min(240px, 72vw);
    border-radius: var(--radius-lg);
  }

  .remote-features {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.75rem;
  }

  .rf-item {
    justify-content: center;
    padding: 0.7rem 0.5rem;
    font-size: 0.85rem;
    text-align: center;
  }

  .final-slogan {
    font-size: clamp(2rem, 9vw, 2.8rem);
  }

  .final-sub {
    margin-bottom: 2rem;
    letter-spacing: 0.06em;
  }

  /* 预约表单移动端 */
  .video-modal-content {
    width: calc(100% - 2rem);
  }

  .video-modal-close {
    top: -44px;
    right: -0.25rem;
  }

  .booking-modal-content {
    padding: 1.5rem;
    width: calc(100% - 1.5rem);
    max-height: calc(100svh - 1.5rem);
    border-radius: var(--radius-lg);
  }

  .form-row {
    grid-template-columns: 1fr;
    gap: 1.2rem;
  }

  .booking-header h3 {
    font-size: 1.3rem;
  }

  /* 管理后台移动端 */
  .admin-page {
    padding: 1rem;
  }

  .admin-stats {
    grid-template-columns: 1fr;
  }

  .admin-table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radius-md);
  }

  .admin-table {
    min-width: 600px;
  }

  .admin-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .shortcuts-toast {
    width: calc(100% - 2rem);
    min-width: 0;
    padding: 1.25rem;
  }

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

@media (max-width: 420px) {
  :root {
    --container-padding: 0.875rem;
    --font-hero: clamp(2.05rem, 12vw, 2.65rem);
    --font-section-title: clamp(1.65rem, 9vw, 2.1rem);
  }

  .navbar,
  .navbar.scrolled {
    padding: 0.65rem 0.75rem;
    gap: 0.55rem;
  }

  .brand-text small {
    display: none;
  }

  .nav-links {
    left: 0.75rem;
    right: 0.75rem;
  }

  .nav-toggle {
    width: 40px;
    height: 40px;
  }

  .section-counter {
    font-size: 0.78rem;
  }

  .hero-section,
  .final-section {
    padding-top: 6rem;
  }

  .problem-card,
  .feature-card,
  .layer-card,
  .workflow-step,
  .workflow-simple,
  .capability-item {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .workflow-step {
    padding-left: 4.55rem;
  }

  .step-icon {
    left: 0.85rem;
  }

  .remote-features,
  .orbit-nodes,
  .hardware-tabs {
    grid-template-columns: 1fr;
  }

  .btn-primary,
  .btn-video,
  .btn-outline {
    max-width: none;
  }

  .admin-actions {
    flex-direction: column;
  }

  .btn-admin {
    width: 100%;
  }
}

/* 大屏优化 */
@media (min-width: 1920px) {
  :root {
    --content-max-width: 1400px;
  }
}

/* --- 滚动条美化 --- */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--bg-card);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-blue);
}

/* --- 选择样式 --- */
::selection {
  background: var(--accent-blue);
  color: white;
}