/* ===== 行业观察与灰度信息分析站 - 主样式表 ===== */
/* 暗色高级感 · 卡片化布局 · 移动端优先 · 研究报告风 */

:root {
  --color-primary: #3b82f6;
  --color-primary-dark: #2563eb;
  --color-primary-light: #60a5fa;
  --color-secondary: #8b5cf6;
  --color-accent: #06b6d4;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --color-success: #10b981;
  --color-bg-body: #0a0e1a;
  --color-bg-card: #111827;
  --color-bg-card-hover: #1f2937;
  --color-bg-header: rgba(10, 14, 26, 0.95);
  --color-bg-footer: #050810;
  --color-text-primary: #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
  --color-border: #1e293b;
  --color-border-light: #334155;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 8px 40px rgba(59, 130, 246, 0.15);
  --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.2);
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;
  --max-width: 1280px;
  --header-height: 72px;
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg-body);
  color: var(--color-text-primary);
  line-height: 1.75;
  min-height: 100vh;
  overflow-x: hidden;
}

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

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

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

ul, ol {
  list-style: none;
}

button, input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
}

/* ===== 布局容器 ===== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 80px 0;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-desc {
  color: var(--color-text-secondary);
  font-size: 1.05rem;
  margin-bottom: 40px;
  max-width: 680px;
}

/* ===== 顶部导航 ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--color-bg-header);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: background var(--transition-normal);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-primary);
}

.site-logo img {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-menu a {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  padding: 4px 0;
}

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

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

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

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== 首屏英雄区 ===== */
.hero {
  position: relative;
  min-height: 600px;
  display: flex;
  align-items: center;
  padding-top: calc(var(--header-height) + 60px);
  padding-bottom: 80px;
  overflow: hidden;
}

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

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10,14,26,0.4) 0%, rgba(10,14,26,0.95) 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

.hero-content h1 {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 20px;
  color: var(--color-text-primary);
}

.hero-content .subtitle {
  font-size: 1.2rem;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
  line-height: 1.8;
}

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

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #fff;
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.4);
  color: #fff;
}

.btn-outline {
  border: 1px solid var(--color-border-light);
  color: var(--color-text-primary);
  background: transparent;
}

.btn-outline:hover {
  border-color: var(--color-primary);
  background: rgba(59, 130, 246, 0.1);
  color: var(--color-primary-light);
}

/* ===== 卡片系统 ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
}

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

.card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.card-body {
  padding: 24px;
}

.card-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(59, 130, 246, 0.15);
  color: var(--color-primary-light);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 500;
  margin-bottom: 12px;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--color-text-primary);
}

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

.card-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.82rem;
}

/* ===== 面包屑 ===== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px 0;
  margin-top: var(--header-height);
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

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

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

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

/* ===== FAQ 手风琴 ===== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  font-weight: 600;
  color: var(--color-text-primary);
  transition: background var(--transition-fast);
}

.faq-question:hover {
  background: var(--color-bg-card-hover);
}

.faq-question .icon {
  font-size: 1.2rem;
  transition: transform var(--transition-normal);
  color: var(--color-primary-light);
}

.faq-item.active .faq-question .icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal), padding var(--transition-normal);
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding: 0 24px 20px;
}

.faq-answer p {
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* ===== 订阅区域 ===== */
.newsletter-section {
  position: relative;
  padding: 60px 0;
  overflow: hidden;
}

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

.newsletter-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.2;
}

.newsletter-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 560px;
  margin: 0 auto;
}

.newsletter-form {
  display: flex;
  gap: 12px;
  margin-top: 24px;
}

.newsletter-form input {
  flex: 1;
  padding: 14px 20px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
}

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

.newsletter-form input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* ===== 搜索框 ===== */
.search-box {
  position: relative;
  max-width: 600px;
  margin: 0 auto;
}

.search-input {
  width: 100%;
  padding: 16px 56px 16px 20px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text-primary);
  font-size: 1rem;
}

.search-input:focus {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
}

.search-btn {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  padding: 10px 16px;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.search-btn:hover {
  background: var(--color-primary-dark);
}

.search-suggestions {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-top: 8px;
  display: none;
  z-index: 100;
  box-shadow: var(--shadow-card);
}

.search-suggestions.active {
  display: block;
}

.search-suggestions a {
  display: block;
  padding: 12px 20px;
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border);
}

.search-suggestions a:last-child {
  border-bottom: none;
}

.search-suggestions a:hover {
  background: var(--color-bg-card-hover);
  color: var(--color-text-primary);
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--color-bg-footer);
  border-top: 1px solid var(--color-border);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  color: var(--color-text-secondary);
  margin-top: 12px;
  font-size: 0.9rem;
  line-height: 1.7;
}

.footer-col h4 {
  color: var(--color-text-primary);
  font-size: 1rem;
  margin-bottom: 16px;
}

.footer-col a {
  display: block;
  color: var(--color-text-secondary);
  font-size: 0.88rem;
  padding: 6px 0;
}

.footer-col a:hover {
  color: var(--color-primary-light);
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  color: var(--color-text-muted);
  font-size: 0.82rem;
}

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: 999;
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.3);
  border: none;
  font-size: 1.2rem;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.5);
}

/* ===== PWA 安装提示 ===== */
.pwa-prompt {
  position: fixed;
  bottom: 24px;
  left: 24px;
  right: 24px;
  max-width: 420px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  display: none;
  align-items: center;
  gap: 16px;
  z-index: 998;
  box-shadow: var(--shadow-card);
}

.pwa-prompt.show {
  display: flex;
}

.pwa-prompt-text {
  flex: 1;
}

.pwa-prompt-text h4 {
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.pwa-prompt-text p {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
}

.pwa-prompt .btn-install {
  padding: 8px 16px;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  cursor: pointer;
  white-space: nowrap;
}

.pwa-prompt .btn-dismiss {
  padding: 8px;
  background: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 1.2rem;
}

/* ===== 提示消息 ===== */
.toast {
  position: fixed;
  top: 90px;
  right: 24px;
  padding: 16px 24px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-success);
  border-radius: var(--radius-md);
  color: var(--color-success);
  font-size: 0.9rem;
  z-index: 9999;
  opacity: 0;
  transform: translateX(100%);
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-card);
}

.toast.show {
  opacity: 1;
  transform: translateX(0);
}

/* ===== 内页通用 ===== */
.page-header {
  padding: 40px 0;
  margin-top: var(--header-height);
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.page-header p {
  color: var(--color-text-secondary);
  font-size: 1.05rem;
  max-width: 680px;
}

.page-content {
  padding: 48px 0 80px;
}

.page-content h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 40px 0 16px;
  color: var(--color-text-primary);
}

.page-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 28px 0 12px;
  color: var(--color-text-primary);
}

.page-content p {
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  line-height: 1.85;
}

.page-content ul, .page-content ol {
  padding-left: 24px;
  margin-bottom: 16px;
}

.page-content li {
  color: var(--color-text-secondary);
  margin-bottom: 8px;
  line-height: 1.7;
  list-style: disc;
}

/* ===== 合规提醒条 ===== */
.compliance-notice {
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.3);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin: 32px 0;
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.compliance-notice .icon {
  color: var(--color-warning);
  font-size: 1.2rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.compliance-notice p {
  color: var(--color-text-secondary);
  font-size: 0.88rem;
  margin: 0;
}

/* ===== 数据统计条 ===== */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding: 40px 0;
}

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

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

/* ===== 时间线 ===== */
.timeline {
  position: relative;
  padding-left: 32px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-bottom: 32px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -28px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 2px solid var(--color-bg-body);
}

.timeline-date {
  font-size: 0.82rem;
  color: var(--color-primary-light);
  margin-bottom: 6px;
}

.timeline-title {
  font-weight: 600;
  margin-bottom: 6px;
}

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

/* ===== 表单 ===== */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--color-text-primary);
  font-size: 0.9rem;
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  transition: border-color var(--transition-fast);
}

.form-control:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

textarea.form-control {
  min-height: 120px;
  resize: vertical;
}

/* ===== 响应式断点 ===== */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }
  
  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg-body);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 24px;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
  }
  
  .nav-menu.active {
    opacity: 1;
    visibility: visible;
  }
  
  .nav-menu a {
    font-size: 1.2rem;
  }
  
  .menu-toggle {
    display: flex;
  }
  
  .hero-content h1 {
    font-size: 1.8rem;
  }
  
  .hero-content .subtitle {
    font-size: 1rem;
  }
  
  .section {
    padding: 48px 0;
  }
  
  .section-title {
    font-size: 1.5rem;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  
  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  
  .stat-number {
    font-size: 1.8rem;
  }
  
  .newsletter-form {
    flex-direction: column;
  }
  
  .hero-actions {
    flex-direction: column;
  }
  
  .page-header h1 {
    font-size: 1.6rem;
  }
  
  .pwa-prompt {
    left: 12px;
    right: 12px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  
  .hero-content h1 {
    font-size: 1.5rem;
  }
  
  .card-body {
    padding: 16px;
  }
}

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

.fade-in-up {
  animation: fadeInUp 0.6s ease forwards;
}

/* ===== 榜单切换 ===== */
.tab-nav {
  display: flex;
  gap: 4px;
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  padding: 4px;
  margin-bottom: 24px;
  overflow-x: auto;
}

.tab-btn {
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  background: none;
}

.tab-btn.active,
.tab-btn:hover {
  background: var(--color-primary);
  color: #fff;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* ===== 列表项 ===== */
.list-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  transition: all var(--transition-fast);
}

.list-item:hover {
  border-color: var(--color-primary);
  background: var(--color-bg-card-hover);
}

.list-rank {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(59, 130, 246, 0.15);
  color: var(--color-primary-light);
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.85rem;
  flex-shrink: 0;
}

.list-content {
  flex: 1;
}

.list-title {
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.list-desc {
  color: var(--color-text-secondary);
  font-size: 0.82rem;
}