/* ===== CSS 变量与全局重置 ===== */
:root {
  /* 颜色 */
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.6);
  --bg-card-hover: rgba(30, 41, 59, 0.7);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border-color: rgba(148, 163, 184, 0.1);
  --border-hover: rgba(59, 130, 246, 0.3);
  --accent-cyan: #22d3ee;
  --accent-blue: #3b82f6;
  --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #06b6d4 100%);
  --gradient-text: linear-gradient(135deg, #60a5fa 0%, #22d3ee 100%);

  /* 字体 */
  --font-sans: 'Inter', 'Noto Sans SC', 'Noto Sans', 'PingFang SC',
    'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;

  /* 间距 */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 5rem;

  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* 过渡 */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

#app {
  position: relative;
  min-height: 100vh;
}

/* ===== 背景装饰 ===== */
.bg-decoration {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.grid-overlay {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(
      rgba(148, 163, 184, 0.03) 1px,
      transparent 1px
    ),
    linear-gradient(90deg, rgba(148, 163, 184, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(
    ellipse at center,
    black 0%,
    transparent 70%
  );
  -webkit-mask-image: radial-gradient(
    ellipse at center,
    black 0%,
    transparent 70%
  );
}

.glow-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.15;
}

.orb-1 {
  width: 500px;
  height: 500px;
  background: var(--accent-blue);
  top: -200px;
  right: -100px;
}

.orb-2 {
  width: 400px;
  height: 400px;
  background: var(--accent-cyan);
  bottom: 10%;
  left: -150px;
}

/* ===== 导航栏 ===== */
.nav-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(10, 14, 23, 0.7);
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-sm) var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-left {
  display: flex;
  align-items: center;
}

.logo-mark {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

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

.logo-bg {
  fill: rgba(59, 130, 246, 0.1);
  stroke: rgba(59, 130, 246, 0.3);
  stroke-width: 1;
}

.logo-text {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav-links {
  display: flex;
  gap: var(--space-md);
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

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

/* 语言切换 */
.lang-switcher {
  display: flex;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 3px;
  gap: 2px;
}

.lang-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition-fast);
  min-width: 42px;
  text-align: center;
}

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

.lang-btn.active {
  background: var(--gradient-primary);
  color: white;
}

/* ===== 主内容 ===== */
.main-content {
  position: relative;
  z-index: 1;
  padding-top: 70px;
}

/* ===== Hero 区域 ===== */
.hero-section {
  position: relative;
  min-height: calc(100vh - 70px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl) var(--space-lg);
}

.hero-container {
  max-width: 900px;
  text-align: center;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 6px 16px;
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.2);
  border-radius: 999px;
  margin-bottom: var(--space-lg);
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
}

.hero-badge span:last-child {
  font-size: 0.875rem;
  color: var(--accent-cyan);
  font-weight: 500;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-md);
  letter-spacing: -0.02em;
}

.title-line {
  display: block;
  color: var(--text-primary);
}

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

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.125rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-lg);
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-base);
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.25);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 28px rgba(59, 130, 246, 0.35);
}

.btn-primary svg {
  transition: transform var(--transition-fast);
}

.btn-primary:hover svg {
  transform: translateX(2px);
}

.hero-grid-accent {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  width: 200px;
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(59, 130, 246, 0.5),
    transparent
  );
}

/* ===== 通用 Section ===== */
.section {
  padding: var(--space-2xl) var(--space-lg);
  position: relative;
}

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

.section-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.section-label {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent-cyan);
  margin-bottom: var(--space-sm);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.section-title {
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

/* ===== 产品介绍区域 ===== */
.about-section {
  background: linear-gradient(
    180deg,
    transparent 0%,
    rgba(17, 24, 39, 0.3) 50%,
    transparent 100%
  );
}

.about-content {
  max-width: 900px;
  margin: 0 auto;
}

.about-text {
  font-size: 1rem;
  color: var(--text-secondary);
  text-align: center;
  line-height: 2;
  margin-bottom: var(--space-xl);
  max-width: 750px;
  margin-left: auto;
  margin-right: auto;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition-base);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-md);
  color: var(--accent-cyan);
  margin-bottom: var(--space-md);
}

.feature-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

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

/* ===== 系统角色区域 ===== */
.roles-section {
  padding-bottom: var(--space-2xl);
}

.roles-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

.role-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition-base);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  overflow: hidden;
}

.role-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.role-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-3px);
}

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

.role-number {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.role-icon-wrap {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(6, 182, 212, 0.08);
  border: 1px solid rgba(6, 182, 212, 0.15);
  border-radius: var(--radius-md);
  color: var(--accent-cyan);
  margin-bottom: var(--space-md);
  margin-top: var(--space-sm);
}

.role-icon {
  width: 28px;
  height: 28px;
}

.role-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.role-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== 研发状态区域 ===== */
.dev-status-section {
  padding: var(--space-xl) var(--space-lg) var(--space-2xl);
}

.dev-status-card {
  max-width: 600px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background: rgba(34, 211, 238, 0.05);
  border: 1px solid rgba(34, 211, 238, 0.15);
  border-radius: var(--radius-lg);
}

.dev-status-icon {
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
}

.dev-status-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ===== 页脚 ===== */
.footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border-color);
  padding: var(--space-lg);
  background: rgba(10, 14, 23, 0.9);
}

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

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-sm);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.footer-logo .logo-icon {
  width: 24px;
  height: 24px;
}

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

.footer-ai-note {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
  padding-top: var(--space-sm);
  border-top: 1px solid var(--border-color);
}

/* ===== 滚动动画 ===== */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 600ms ease, transform 600ms ease;
}

.reveal.delay-1 {
  transition-delay: 100ms;
}

.reveal.delay-2 {
  transition-delay: 200ms;
}

.reveal.delay-3 {
  transition-delay: 300ms;
}

/* ===== 响应式设计 ===== */
@media (max-width: 968px) {
  .roles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-container {
    padding: var(--space-sm);
  }

  .nav-links {
    display: none;
  }

  .hero-section {
    min-height: auto;
    padding: var(--space-xl) var(--space-sm);
    padding-top: var(--space-2xl);
  }

  .section {
    padding: var(--space-xl) var(--space-sm);
  }

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

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

  .footer-content {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }

  .lang-btn {
    padding: 5px 10px;
    font-size: 0.75rem;
    min-width: 36px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.75rem;
  }

  .section-title {
    font-size: 1.375rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 240px;
    justify-content: center;
  }
}