/* ============================
   黑料网SaaS级舆情监控平台 - 深蓝科技风格
   设计哲学：数据驱动、企业级、科技感
   色彩体系：深海蓝黑 + 亮蓝 + 科技绿
   ============================ */

:root {
  --primary: #0D47A1;
  --secondary: #42A5F5;
  --bg: #0A1929;
  --card: #132F4C;
  --accent: #00E676;
  --text: #E3F2FD;
  --text-muted: #90CAF9;
  --border: rgba(66, 165, 245, 0.2);
  --radius: 8px;
  --shadow: 0 4px 20px rgba(13, 71, 161, 0.3);
  --shadow-lg: 0 8px 40px rgba(13, 71, 161, 0.4);
  --gradient-primary: linear-gradient(135deg, #0D47A1 0%, #1565C0 50%, #42A5F5 100%);
  --gradient-card: linear-gradient(145deg, #132F4C 0%, #1A3A5C 100%);
  --gradient-accent: linear-gradient(135deg, #00E676 0%, #00C853 100%);
  --font-heading: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
  --font-body: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --font-data: 'DIN Alternate', 'Tabular Nums', system-ui, sans-serif;
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --ease-in-out: cubic-bezier(0.77, 0, 0.175, 1);
  --transition-fast: 160ms var(--ease-out);
  --transition-normal: 250ms var(--ease-out);
  --transition-slow: 400ms var(--ease-out);
}

/* 基础重置 */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

/* 容器 */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

@media (min-width: 768px) {
  .container {
    padding: 0 2rem;
  }
}

/* 导航栏 */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 25, 41, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 0;
  transition: background var(--transition-normal);
}

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

.nav-brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-brand svg {
  width: 28px;
  height: 28px;
  fill: var(--secondary);
}

.nav-links {
  display: none;
  list-style: none;
  gap: 1.5rem;
  align-items: center;
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition-normal);
}

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

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

.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text);
  transition: transform var(--transition-fast);
}

/* 移动端菜单 */
.mobile-menu {
  display: none;
  position: fixed;
  top: 60px;
  left: 0;
  right: 0;
  background: rgba(10, 25, 41, 0.98);
  backdrop-filter: blur(12px);
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
  z-index: 999;
}

.mobile-menu.active {
  display: block;
}

.mobile-menu a {
  display: block;
  padding: 0.75rem 0;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  font-size: 1rem;
}

.mobile-menu a:last-child {
  border-bottom: none;
}

/* 英雄区域 */
.hero {
  padding: 8rem 0 5rem;
  position: relative;
  overflow: hidden;
  min-height: 90vh;
  display: flex;
  align-items: center;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at 30% 20%, rgba(13, 71, 161, 0.3) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 80%, rgba(66, 165, 245, 0.15) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--text) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  max-width: 560px;
}

.hero-visual {
  position: absolute;
  right: -5%;
  top: 50%;
  transform: translateY(-50%);
  width: 50%;
  max-width: 600px;
  opacity: 0.85;
}

@media (max-width: 768px) {
  .hero-visual {
    display: none;
  }
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
  text-decoration: none;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 4px 15px rgba(13, 71, 161, 0.4);
}

.btn-primary:hover {
  box-shadow: 0 6px 25px rgba(13, 71, 161, 0.6);
  color: #fff;
}

.btn-accent {
  background: var(--gradient-accent);
  color: #0A1929;
  box-shadow: 0 4px 15px rgba(0, 230, 118, 0.3);
}

.btn-accent:hover {
  box-shadow: 0 6px 25px rgba(0, 230, 118, 0.5);
  color: #0A1929;
}

.btn-outline {
  background: transparent;
  color: var(--secondary);
  border: 1.5px solid var(--secondary);
}

.btn-outline:hover {
  background: rgba(66, 165, 245, 0.1);
  color: var(--secondary);
}

/* 章节 */
.section {
  padding: 5rem 0;
  position: relative;
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 1rem;
  color: var(--text);
}

.section-subtitle {
  text-align: center;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 3rem;
  font-size: 1.05rem;
}

/* 卡片 */
.card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

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

/* 网格布局 */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

@media (min-width: 768px) {
  .grid-4 {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* 功能图标 */
.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(66, 165, 245, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

.feature-icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--secondary);
}

/* 定价卡片 */
.pricing-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  text-align: center;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  position: relative;
}

.pricing-card.featured {
  border-color: var(--accent);
  transform: scale(1.02);
}

.pricing-card.featured::before {
  content: '推荐';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-accent);
  color: #0A1929;
  padding: 0.25rem 1rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 700;
}

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

.pricing-card.featured:hover {
  transform: scale(1.02) translateY(-4px);
}

.pricing-price {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text);
  margin: 1rem 0;
  font-family: var(--font-data);
}

.pricing-price span {
  font-size: 1rem;
  font-weight: 400;
  color: var(--text-muted);
}

.pricing-features {
  list-style: none;
  text-align: left;
  margin: 1.5rem 0;
}

.pricing-features li {
  padding: 0.5rem 0;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
}

.pricing-features li::before {
  content: '✓';
  color: var(--accent);
  font-weight: 700;
}

/* 代码块 */
.code-block {
  background: #0D1B2A;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.8;
  color: var(--text-muted);
}

.code-block .keyword {
  color: #C792EA;
}

.code-block .string {
  color: #C3E88D;
}

.code-block .comment {
  color: #546E7A;
}

.code-block .function {
  color: #82AAFF;
}

.code-block .number {
  color: #F78C6C;
}

/* 统计数字 */
.stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  padding: 2rem 0;
}

@media (min-width: 768px) {
  .stats {
    grid-template-columns: repeat(4, 1fr);
  }
}

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

.stat-number {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  color: var(--accent);
  font-family: var(--font-data);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* 仪表盘模拟 */
.dashboard-preview {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
}

.dashboard-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.dashboard-dot {
  display: flex;
  gap: 6px;
}

.dashboard-dot span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dashboard-dot span:nth-child(1) { background: #FF5F57; }
.dashboard-dot span:nth-child(2) { background: #FFBD2E; }
.dashboard-dot span:nth-child(3) { background: #28CA41; }

/* Logo墙 */
.logo-wall {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  align-items: center;
  justify-items: center;
  opacity: 0.7;
}

@media (min-width: 768px) {
  .logo-wall {
    grid-template-columns: repeat(6, 1fr);
  }
}

.logo-wall img {
  max-height: 40px;
  filter: brightness(0) invert(0.7);
  transition: filter var(--transition-fast);
}

.logo-wall img:hover {
  filter: brightness(0) invert(1);
}

/* 面包屑 */
.breadcrumb {
  padding: 1rem 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.breadcrumb a {
  color: var(--text-muted);
}

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

.breadcrumb span {
  margin: 0 0.5rem;
  color: var(--border);
}

/* 页脚 */
.footer {
  background: #061220;
  border-top: 1px solid var(--border);
  padding: 4rem 0 2rem;
  margin-top: 4rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

.footer-brand {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text);
}

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

.footer-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.85rem;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 2rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* FAQ */
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 1rem;
  overflow: hidden;
}

.faq-question {
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
  color: var(--text);
  background: var(--card);
  transition: background var(--transition-fast);
}

.faq-question:hover {
  background: rgba(19, 47, 76, 0.8);
}

.faq-question::after {
  content: '+';
  font-size: 1.25rem;
  color: var(--secondary);
  transition: transform var(--transition-fast);
}

.faq-item.active .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 1.5rem;
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow), padding var(--transition-slow);
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.8;
}

.faq-item.active .faq-answer {
  padding: 1.25rem 1.5rem;
  max-height: 500px;
}

/* 页面头部 */
.page-header {
  padding: 7rem 0 3rem;
  background: linear-gradient(180deg, rgba(13, 71, 161, 0.15) 0%, transparent 100%);
  text-align: center;
}

.page-header h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  margin-bottom: 1rem;
  color: var(--text);
}

.page-header p {
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
  font-size: 1.05rem;
}

/* 标签 */
.tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: rgba(66, 165, 245, 0.1);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.8rem;
  color: var(--secondary);
}

/* 数据指示器 */
.data-indicator {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

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

/* 计数器动画 */
@keyframes countUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-count {
  animation: countUp 0.6s var(--ease-out) forwards;
}

/* 渐入动画 */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in-up {
  opacity: 0;
  animation: fadeInUp 0.6s var(--ease-out) forwards;
}

.fade-in-up:nth-child(2) { animation-delay: 0.1s; }
.fade-in-up:nth-child(3) { animation-delay: 0.2s; }
.fade-in-up:nth-child(4) { animation-delay: 0.3s; }
.fade-in-up:nth-child(5) { animation-delay: 0.4s; }
.fade-in-up:nth-child(6) { animation-delay: 0.5s; }

/* 数据网格背景 */
.grid-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    linear-gradient(rgba(66, 165, 245, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(66, 165, 245, 0.05) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

/* 搜索框 */
.search-box {
  display: flex;
  max-width: 600px;
  margin: 0 auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--card);
}

.search-box input {
  flex: 1;
  padding: 1rem 1.5rem;
  background: transparent;
  border: none;
  color: var(--text);
  font-size: 1rem;
  outline: none;
}

.search-box input::placeholder {
  color: var(--text-muted);
}

.search-box button {
  padding: 1rem 1.5rem;
  background: var(--primary);
  border: none;
  color: #fff;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.search-box button:hover {
  background: var(--secondary);
}

/* 表格 */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.data-table th,
.data-table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.data-table th {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.data-table td {
  color: var(--text);
}

/* 进度条 */
.progress-bar {
  height: 6px;
  background: rgba(66, 165, 245, 0.2);
  border-radius: 3px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 3px;
  transition: width 1s var(--ease-out);
}

/* 响应式图片容器 */
.img-container {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}

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

/* 滚动条样式 */
::-webkit-scrollbar {
  width: 8px;
}

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

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

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

/* 打印样式 */
@media print {
  .nav, .footer, .btn {
    display: none;
  }
  body {
    background: #fff;
    color: #000;
  }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}