/* ===== 变量与重置 ===== */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #1a1a24;
  --bg-card-hover: #22222e;
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.15);
  --text-primary: #f0f0f5;
  --text-secondary: #9898a8;
  --text-muted: #68687a;
  --accent: #7c6aef;
  --accent-light: #9d8ff5;
  --accent-glow: rgba(124, 106, 239, 0.4);
  --gradient-start: #7c6aef;
  --gradient-end: #5b9cf5;
  --success: #34d399;
  --radius: 12px;
  --radius-lg: 20px;
  --header-height: 72px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

ul { list-style: none; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== 导航 ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(10, 10, 15, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.header.scrolled {
  background: rgba(10, 10, 15, 0.95);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.logo-icon {
  width: 28px;
  height: 28px;
  color: var(--accent-light);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--transition);
}

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

.nav-cta {
  background: var(--accent) !important;
  color: white !important;
  padding: 8px 20px;
  border-radius: 8px;
  font-weight: 500;
  transition: background var(--transition), transform var(--transition) !important;
}

.nav-cta:hover {
  background: var(--accent-light) !important;
  transform: translateY(-1px);
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

.mobile-menu {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 24px;
  flex-direction: column;
  gap: 16px;
  z-index: 999;
}

.mobile-menu.open {
  display: flex;
}

.mobile-menu a {
  font-size: 1.1rem;
  color: var(--text-secondary);
  padding: 8px 0;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: white;
  box-shadow: 0 4px 24px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px var(--accent-glow);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--border-hover);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  padding: calc(var(--header-height) + 80px) 0 100px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.5;
}

.hero-glow-1 {
  width: 600px;
  height: 600px;
  background: var(--accent);
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  opacity: 0.15;
}

.hero-glow-2 {
  width: 400px;
  height: 400px;
  background: var(--gradient-end);
  top: 100px;
  right: -100px;
  opacity: 0.1;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 20%, transparent 70%);
}

.hero-content {
  position: relative;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(124, 106, 239, 0.12);
  border: 1px solid rgba(124, 106, 239, 0.25);
  border-radius: 100px;
  font-size: 0.85rem;
  color: var(--accent-light);
  margin-bottom: 28px;
  animation: fadeInUp 0.6s ease;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background: var(--success);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  animation: fadeInUp 0.6s ease 0.1s both;
}

.gradient-text {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 36px;
  line-height: 1.7;
  animation: fadeInUp 0.6s ease 0.2s both;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 16px;
  animation: fadeInUp 0.6s ease 0.3s both;
}

.hero-note {
  font-size: 0.85rem;
  color: var(--text-muted);
  animation: fadeInUp 0.6s ease 0.4s both;
}

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

/* ===== 编辑器预览 ===== */
.editor-preview {
  margin-top: 64px;
  animation: fadeInUp 0.8s ease 0.5s both;
}

.editor-window {
  max-width: 800px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.05),
    0 24px 80px rgba(0,0,0,0.5),
    0 0 120px rgba(124, 106, 239, 0.08);
}

.editor-titlebar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: rgba(0,0,0,0.3);
  border-bottom: 1px solid var(--border);
}

.window-dots {
  display: flex;
  gap: 6px;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.dot.red { background: #ff5f57; }
.dot.yellow { background: #febc2e; }
.dot.green { background: #28c840; }

.editor-filename {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.editor-body {
  display: flex;
  min-height: 280px;
}

.editor-sidebar {
  width: 48px;
  background: rgba(0,0,0,0.2);
  border-right: 1px solid var(--border);
  padding: 12px 8px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sidebar-item {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
}

.sidebar-item.active {
  background: var(--accent);
  width: 80%;
}

.editor-code {
  flex: 1;
  padding: 20px;
  position: relative;
  overflow: hidden;
}

.editor-code pre {
  font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.kw { color: #c792ea; }
.fn { color: #82aaff; }
.str { color: #c3e88d; }
.num { color: #f78c6c; }
.tag { color: #f07178; }
.attr { color: #ffcb6b; }
.cmt { color: #546e7a; font-style: italic; }

.ai-suggestion {
  position: absolute;
  bottom: 16px;
  right: 16px;
  left: 16px;
  background: rgba(124, 106, 239, 0.1);
  border: 1px solid rgba(124, 106, 239, 0.3);
  border-radius: var(--radius);
  padding: 14px 16px;
  animation: slideUp 0.5s ease 1s both;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.ai-suggestion-header {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-light);
  margin-bottom: 6px;
}

.ai-icon {
  font-size: 0.9rem;
}

.ai-suggestion p {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.ai-actions {
  display: flex;
  gap: 8px;
}

.ai-btn {
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 0.75rem;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
}

.ai-btn.accept {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

/* ===== 数据统计 ===== */
.stats {
  padding: 60px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ===== 通用区块 ===== */
.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-light);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.section-header h2 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 500px;
  margin: 0 auto;
}

/* ===== 功能特性 ===== */
.features {
  padding: 100px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition);
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-4px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: rgba(124, 106, 239, 0.12);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-icon svg {
  width: 24px;
  height: 24px;
  color: var(--accent-light);
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 10px;
}

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

/* ===== 工作原理 ===== */
.how-it-works {
  padding: 100px 0;
  background: var(--bg-secondary);
}

.steps {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
}

.step {
  flex: 1;
  max-width: 300px;
  text-align: center;
  padding: 0 24px;
}

.step-number {
  font-size: 3rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  opacity: 0.6;
  margin-bottom: 16px;
}

.step h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 10px;
}

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

.step-connector {
  width: 80px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--gradient-end));
  margin-top: 48px;
  opacity: 0.3;
  flex-shrink: 0;
}

/* ===== 用户评价 ===== */
.testimonials {
  padding: 100px 0;
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition);
}

.testimonial-card:hover {
  border-color: var(--border-hover);
}

.testimonial-card.featured {
  background: linear-gradient(135deg, rgba(124, 106, 239, 0.1), rgba(91, 156, 245, 0.05));
  border-color: rgba(124, 106, 239, 0.25);
}

.stars {
  color: #fbbf24;
  font-size: 0.9rem;
  margin-bottom: 16px;
  letter-spacing: 2px;
}

.testimonial-card > p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.author-avatar {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 600;
  color: white;
}

.testimonial-author strong {
  display: block;
  font-size: 0.9rem;
}

.testimonial-author span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ===== 下载区域 ===== */
.download {
  padding: 100px 0;
}

.download-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 64px 48px;
  text-align: center;
  overflow: hidden;
}

.download-glow {
  position: absolute;
  width: 500px;
  height: 500px;
  background: var(--accent);
  border-radius: 50%;
  filter: blur(150px);
  opacity: 0.08;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.download-content {
  position: relative;
}

.download-content h2 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.download-content > p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 40px;
}

.download-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.download-btn {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 28px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--transition);
  min-width: 200px;
}

.download-btn:hover {
  background: rgba(124, 106, 239, 0.12);
  border-color: rgba(124, 106, 239, 0.4);
  transform: translateY(-2px);
}

.download-btn.highlight {
  background: rgba(124, 106, 239, 0.15);
  border-color: var(--accent);
  box-shadow: 0 0 24px var(--accent-glow);
}

.download-btn svg {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.os-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.os-name {
  display: block;
  font-size: 1rem;
  font-weight: 600;
}

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

.download-note a {
  color: var(--accent-light);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ===== FAQ ===== */
.faq {
  padding: 80px 0 100px;
  background: var(--bg-secondary);
}

.faq-list {
  max-width: 700px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
}

.faq-item summary {
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.faq-item summary::after {
  content: '+';
  font-size: 1.4rem;
  color: var(--text-muted);
  transition: transform var(--transition);
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item p {
  margin-top: 12px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  padding-right: 32px;
}

/* ===== SEO 内容介绍 ===== */
.seo-intro {
  padding: 80px 0;
  border-top: 1px solid var(--border);
}

.seo-intro-content {
  max-width: 800px;
  margin: 0 auto;
}

.seo-intro-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.seo-intro-content p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.9;
  margin-bottom: 16px;
}

.seo-intro-content p:last-child {
  margin-bottom: 0;
}

.seo-intro-content a {
  color: var(--accent-light);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.seo-intro-content a:hover {
  color: var(--text-primary);
}

/* ===== 页脚 ===== */
.footer {
  border-top: 1px solid var(--border);
  padding: 64px 0 32px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 12px;
}

.footer-links {
  display: flex;
  gap: 64px;
}

.footer-links h4 {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.footer-links a {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 10px;
  transition: color var(--transition);
}

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

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid var(--border);
  text-align: center;
}

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

/* ===== 滚动动画 ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .features-grid,
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .mobile-menu-btn { display: flex; }

  .hero { padding-bottom: 60px; }

  .features-grid,
  .testimonials-grid {
    grid-template-columns: 1fr;
  }

  .steps {
    flex-direction: column;
    align-items: center;
    gap: 32px;
  }

  .step-connector {
    width: 2px;
    height: 40px;
    margin: 0;
  }

  .download-card {
    padding: 40px 24px;
  }

  .download-buttons {
    flex-direction: column;
    align-items: center;
  }

  .download-btn {
    width: 100%;
    max-width: 300px;
  }

  .footer-content {
    flex-direction: column;
    gap: 32px;
  }

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

  .editor-sidebar { display: none; }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn-lg {
    width: 100%;
    max-width: 300px;
    justify-content: center;
  }
}