/* ── 核心设计系统 ──────────────────────────────── */
:root[data-theme="dark"] {
  --bg-base: #0f172a;
  --bg-surface: rgba(30, 41, 59, 0.7);
  --bg-elevated: rgba(51, 65, 85, 0.5);
  --bg-alt: #1e293b;
  --border: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(99, 102, 241, 0.4);
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-tertiary: #94a3b8;
  --primary: #6366f1;
  --primary-glow: rgba(99, 102, 241, 0.15);
  --accent: #8b5cf6;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.25);
  --glass-blur: blur(16px);
}

:root[data-theme="light"] {
  --bg-base: #f8fafc;
  --bg-surface: rgba(255, 255, 255, 0.75);
  --bg-elevated: rgba(241, 245, 249, 0.8);
  --bg-alt: #f1f5f9;
  --border: rgba(0, 0, 0, 0.06);
  --border-focus: rgba(99, 102, 241, 0.3);
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-tertiary: #64748b;
  --primary: #4f46e5;
  --primary-glow: rgba(79, 70, 229, 0.1);
  --accent: #7c3aed;
  --success: #059669;
  --warning: #d97706;
  --danger: #dc2626;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 0 40px rgba(79, 70, 229, 0.15);
  --glass-blur: blur(12px);
}

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

html {
  scroll-behavior: smooth;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
  background-color: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color 0.3s, color 0.3s;
}

/* ── 布局与容器 ──────────────────────────────── */
.section {
  padding: 100px 24px;
  position: relative;
}

.section.bg-alt {
  background-color: var(--bg-alt);
}

.section-container {
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
}

.section-title {
  font-family: 'Outfit', sans-serif;
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
  line-height: 1.2;
}

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

/* ── 按钮样式 ────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}

.btn-large {
  padding: 14px 28px;
  font-size: 16px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border);
  backdrop-filter: var(--glass-blur);
}

.btn-secondary:hover {
  background: var(--bg-elevated);
  transform: translateY(-2px);
}

/* ── 渐变文字 ────────────────────────────────── */
.gradient-text {
  background: linear-gradient(135deg, #818cf8, #a78bfa, #f472b6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ── 顶部导航栏 ──────────────────────────────── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 72px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  backdrop-filter: var(--glass-blur);
  z-index: 1000;
  transition: background-color 0.3s, border-color 0.3s;
}

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

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

.brand-logo {
  width: 32px;
  height: 32px;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 18px;
  line-height: 1.1;
}

.brand-subtitle {
  font-size: 10px;
  color: var(--text-tertiary);
  letter-spacing: 0.5px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

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

.nav-links a.nav-cta {
  background: var(--primary-glow);
  color: var(--primary);
  padding: 8px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-focus);
}

.nav-links a.nav-cta:hover {
  background: var(--primary);
  color: white;
}

.theme-toggle {
  background: transparent;
  border: none;
  font-size: 18px;
  cursor: pointer;
  padding: 4px;
  transition: transform 0.2s;
}

.theme-toggle:hover {
  transform: rotate(15deg) scale(1.1);
}

/* ── 英雄区 (Hero) ────────────────────────────── */
.hero {
  padding: 160px 24px 100px;
  position: relative;
  overflow: hidden;
}

.hero-bg-glow {
  position: absolute;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, rgba(139, 92, 246, 0.05) 50%, transparent 100%);
  filter: blur(80px);
  z-index: 1;
  pointer-events: none;
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
  position: relative;
  z-index: 2;
}

.hero-content {
  max-width: 600px;
}

.hero-badge {
  display: inline-flex;
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 600;
  background: var(--primary-glow);
  color: var(--primary);
  border-radius: 20px;
  margin-bottom: 24px;
  border: 1px solid var(--border-focus);
}

.hero-title {
  font-family: 'Outfit', sans-serif;
  font-size: 48px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 20px;
}

.hero-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 36px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
}

/* ── 模拟窗口 (Window Mockup) ─────────────────── */
.window-mockup {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  backdrop-filter: var(--glass-blur);
  overflow: hidden;
  height: 380px;
  display: flex;
  flex-direction: column;
}

.window-header {
  height: 40px;
  background: rgba(0, 0, 0, 0.05);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 8px;
}

.window-header .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.window-header .dot.red { background: #ff5f56; }
.window-header .dot.yellow { background: #ffbd2e; }
.window-header .dot.green { background: #27c93f; }

.window-title {
  font-size: 11px;
  color: var(--text-tertiary);
  margin-left: 8px;
  font-weight: 500;
}

.window-body {
  flex: 1;
  overflow: hidden;
}

.mock-grid {
  display: grid;
  grid-template-columns: 110px 1fr 130px;
  height: 100%;
}

.mock-sidebar {
  border-right: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.02);
  padding: 10px 6px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.mock-nav-item {
  padding: 6px 8px;
  font-size: 10px;
  font-weight: 500;
  border-radius: 4px;
  color: var(--text-secondary);
}

.mock-nav-item.active {
  background: var(--primary-glow);
  color: var(--primary);
  font-weight: 600;
}

.mock-main {
  padding: 12px;
  display: flex;
  flex-direction: column;
}

.mock-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px;
  flex: 1;
}

.mock-badge {
  font-size: 8px;
  background: var(--success);
  color: white;
  padding: 2px 4px;
  border-radius: 2px;
}

.mock-code {
  font-family: monospace;
  font-size: 10px;
  margin-top: 10px;
  color: var(--text-secondary);
}

.mock-ai-bar {
  border-left: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.02);
  display: flex;
  flex-direction: column;
}

.mock-ai-header {
  padding: 8px;
  font-size: 9px;
  font-weight: 700;
  border-bottom: 1px solid var(--border);
  text-align: center;
  color: var(--primary);
}

.mock-ai-chat {
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}

.mock-chat-bubble {
  padding: 6px;
  border-radius: 4px;
  font-size: 9px;
}

.mock-chat-bubble.user {
  background: var(--primary);
  color: white;
  align-self: flex-end;
}

.mock-chat-bubble.assistant {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border);
  align-self: flex-start;
}

/* ── 核心特色 (Core Features) ────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: var(--glass-blur);
  transition: all 0.3s ease;
  box-shadow: var(--shadow-sm);
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 24px;
}

.feature-icon.bg-indigo { background: rgba(99, 102, 241, 0.1); color: var(--primary); }
.feature-icon.bg-purple { background: rgba(139, 92, 246, 0.1); color: var(--accent); }
.feature-icon.bg-cyan { background: rgba(6, 182, 212, 0.1); color: #06b6d4; }
.feature-icon.bg-amber { background: rgba(245, 158, 11, 0.1); color: var(--warning); }
.feature-icon.bg-pink { background: rgba(236, 72, 153, 0.1); color: #ec4899; }
.feature-icon.bg-emerald { background: rgba(16, 185, 129, 0.1); color: var(--success); }

.feature-name {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
}

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

/* ── 全景工具分类与展示 (Tools Showcase) ──────── */
.tools-tab-container {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.tools-tab {
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  border: 1px solid var(--border);
  background: var(--bg-surface);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
}

.tools-tab:hover {
  border-color: var(--text-tertiary);
  color: var(--text-primary);
}

.tools-tab.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.showcase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.showcase-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
  backdrop-filter: var(--glass-blur);
  transition: all 0.2s ease;
}

.showcase-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.showcase-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.showcase-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 800;
}

.showcase-icon.color-indigo { background: rgba(99,102,241,.1); color: var(--primary); }
.showcase-icon.color-violet { background: rgba(139,92,246,.1); color: var(--accent); }
.showcase-icon.color-cyan { background: rgba(6,182,212,.1); color: #06b6d4; }
.showcase-icon.color-sky { background: rgba(14,165,233,.1); color: #0ea5e9; }
.showcase-icon.color-teal { background: rgba(20,184,166,.1); color: #14b8a6; }
.showcase-icon.color-amber { background: rgba(245,158,11,.1); color: var(--warning); }
.showcase-icon.color-pink { background: rgba(236,72,153,.1); color: #ec4899; }
.showcase-icon.color-orange { background: rgba(249,115,22,.1); color: #f97316; }
.showcase-icon.color-emerald { background: rgba(16,185,129,.1); color: var(--success); }
.showcase-icon.color-rose { background: rgba(244,63,94,.1); color: #f43f5e; }

.showcase-name {
  font-size: 15px;
  font-weight: 700;
}

.showcase-desc {
  color: var(--text-secondary);
  font-size: 13px;
  line-height: 1.5;
}

/* ── AI 特写 (AI Feature) ────────────────────── */
.ai-showcase-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 60px;
  backdrop-filter: var(--glass-blur);
  box-shadow: var(--shadow-md);
}

.ai-showcase-content {
  display: flex;
  flex-direction: column;
}

.ai-showcase-title {
  font-family: 'Outfit', sans-serif;
  font-size: 32px;
  font-weight: 800;
  margin-top: 16px;
  margin-bottom: 20px;
}

.ai-showcase-desc {
  color: var(--text-secondary);
  font-size: 15px;
  margin-bottom: 24px;
}

.ai-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 30px;
}

.ai-bullets li {
  position: relative;
  padding-left: 24px;
  font-size: 14px;
  color: var(--text-secondary);
}

.ai-bullets li::before {
  content: '⚡';
  position: absolute;
  left: 0;
  top: 2px;
  font-size: 12px;
}

.ai-bullets li strong {
  color: var(--text-primary);
}

.ai-card-tip {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px;
  font-size: 13px;
  color: var(--text-secondary);
  border-left: 4px solid var(--accent);
}

/* ── 模拟面板 (Panel Mockup) ─────────────────── */
.panel-mockup {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  height: 380px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.panel-mock-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-surface);
  font-size: 12px;
}

.mock-model-select {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 10px;
}

.panel-mock-body {
  flex: 1;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow: hidden;
}

.mock-bubble {
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 11px;
  max-width: 85%;
}

.mock-bubble.user {
  background: var(--primary);
  color: white;
  align-self: flex-end;
  border-radius: 10px 10px 2px 10px;
}

.mock-bubble.assistant {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  color: var(--text-primary);
  align-self: flex-start;
  border-radius: 10px 10px 10px 2px;
}

.panel-mock-footer {
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  background: var(--bg-surface);
}

.mock-input {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  padding: 6px 12px;
  border-radius: var(--radius-md);
  font-size: 11px;
  color: var(--text-tertiary);
}

/* ── 安装步骤 (Installation) ─────────────────── */
.section.bg-gradient {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.08) 0%, rgba(139, 92, 246, 0.08) 100%);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

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

.install-title {
  font-family: 'Outfit', sans-serif;
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 16px;
}

.install-subtitle {
  color: var(--text-secondary);
  font-size: 16px;
  margin-bottom: 60px;
}

.steps-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-bottom: 60px;
  text-align: left;
}

.step-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 30px;
  backdrop-filter: var(--glass-blur);
  position: relative;
}

.step-num {
  font-family: 'Outfit', sans-serif;
  font-size: 48px;
  font-weight: 800;
  color: var(--primary-glow);
  line-height: 1;
  margin-bottom: 20px;
}

.step-text h4 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.step-text p {
  color: var(--text-secondary);
  font-size: 13px;
  line-height: 1.6;
}

.step-code {
  margin-top: 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  padding: 8px 12px;
  border-radius: 4px;
  font-family: monospace;
  font-size: 11px;
  overflow-x: auto;
}

.install-action {
  margin-top: 20px;
}

/* ── 页脚 (Footer) ───────────────────────────── */
.footer {
  padding: 60px 24px;
  border-top: 1px solid var(--border);
  background: var(--bg-base);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 18px;
}

.footer-text {
  font-size: 13px;
  color: var(--text-tertiary);
  max-width: 500px;
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 13px;
  transition: color 0.2s;
}

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

/* ── 自适应响应式 (Responsive) ────────────────── */
@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }
  
  .hero-content {
    max-width: 100%;
    margin: 0 auto;
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .ai-showcase-box {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: 40px;
  }
  
  .steps-container {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none; /* 简化移动端，可补充折叠菜单 */
  }
  
  .section {
    padding: 60px 24px;
  }
  
  .hero {
    padding: 120px 24px 60px;
  }
  
  .hero-title {
    font-size: 32px;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .section-title {
    font-size: 28px;
  }
  
  .ai-showcase-box {
    padding: 24px;
  }
  
  .ai-showcase-title {
    font-size: 24px;
  }
}