/* ============================================
   黑料网深度调查新闻智库 - 全局样式表
   设计风格：白灰极简严肃新闻风格
   色彩体系：纯黑+中灰+纯白+极浅灰+新闻红
   ============================================ */

:root {
  --primary: #1A1A1A;
  --secondary: #666666;
  --bg: #FFFFFF;
  --card: #F8F8F8;
  --accent: #C62828;
  --text: #333333;
  --text-light: #888888;
  --border: #E5E5E5;
  --radius: 2px;
  --shadow: 0 1px 4px rgba(0,0,0,0.06);
  --shadow-hover: 0 4px 12px rgba(0,0,0,0.1);
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "SimSun", serif;
  --font-sans: "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  --max-width: 1200px;
  --transition: 0.2s ease;
}

/* 重置与基础 */
*, *::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-serif);
  color: var(--text);
  background-color: var(--bg);
  line-height: 1.8;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

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

ul, ol {
  list-style: none;
}

/* 排版 */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--primary);
  line-height: 1.4;
}

h1 { font-size: 2.25rem; margin-bottom: 1rem; }
h2 { font-size: 1.75rem; margin-bottom: 0.75rem; }
h3 { font-size: 1.375rem; margin-bottom: 0.5rem; }
h4 { font-size: 1.125rem; margin-bottom: 0.5rem; }

p {
  margin-bottom: 1rem;
  text-align: justify;
}

blockquote {
  border-left: 3px solid var(--accent);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  background: var(--card);
  font-style: italic;
  color: var(--secondary);
}

/* 布局容器 */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 3rem 0;
}

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

/* 导航栏 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  white-space: nowrap;
}

.site-logo img {
  height: 32px;
  width: auto;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.main-nav a {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--secondary);
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: all var(--transition);
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--primary);
  border-bottom-color: var(--accent);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--primary);
  margin: 5px 0;
  transition: var(--transition);
}

/* 面包屑 */
.breadcrumb {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  color: var(--text-light);
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}

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

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

/* 首屏头条 */
.hero-headline {
  padding: 3rem 0;
  border-bottom: 1px solid var(--border);
}

.hero-headline h1 {
  font-size: 2.5rem;
  line-height: 1.3;
  margin-bottom: 1rem;
}

.hero-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  color: var(--text-light);
  margin-bottom: 1.5rem;
}

.hero-meta .tag-breaking {
  background: var(--accent);
  color: #fff;
  padding: 0.125rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
}

.hero-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

.hero-summary {
  font-size: 1.125rem;
  line-height: 1.9;
  color: var(--text);
}

.hero-image {
  width: 100%;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* 卡片系统 */
.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: box-shadow var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-hover);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.card-image {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: var(--radius);
  margin-bottom: 1rem;
}

.card-tag {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  padding: 0.125rem 0.5rem;
  background: var(--card);
  color: var(--secondary);
  border: 1px solid var(--border);
  margin-bottom: 0.5rem;
}

.card-title {
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
}

.card-excerpt {
  font-size: 0.9375rem;
  color: var(--secondary);
  line-height: 1.7;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  color: var(--text-light);
}

/* 事实核查标签 */
.fact-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius);
}

.fact-tag--verified {
  background: #E8F5E9;
  color: #2E7D32;
  border: 1px solid #C8E6C9;
}

.fact-tag--pending {
  background: #FFF3E0;
  color: #E65100;
  border: 1px solid #FFE0B2;
}

.fact-tag--disputed {
  background: #FFEBEE;
  color: #C62828;
  border: 1px solid #FFCDD2;
}

/* 时间线 */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0.5rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  padding-bottom: 2rem;
  padding-left: 1.5rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -1.75rem;
  top: 0.5rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 2px var(--accent);
}

.timeline-date {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.timeline-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.timeline-desc {
  font-size: 0.9375rem;
  color: var(--secondary);
}

/* 证据链展示板 */
.evidence-board {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.evidence-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
}

.evidence-number {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.evidence-type {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  background: var(--primary);
  color: #fff;
  padding: 0.1rem 0.4rem;
  margin-bottom: 0.5rem;
}

/* 信源保护说明框 */
.source-protection {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
}

.source-protection-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

/* PDF报告下载 */
.report-download {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.report-cover {
  width: 120px;
  height: 160px;
  object-fit: cover;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  flex-shrink: 0;
}

.report-info h4 {
  margin-bottom: 0.25rem;
}

.report-pages {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  color: var(--text-light);
  margin-bottom: 0.75rem;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.625rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--primary);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

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

.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.btn-primary:hover {
  background: #333;
  color: #fff;
}

.btn-accent {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.btn-accent:hover {
  background: #a52020;
  color: #fff;
}

/* 团队展示 */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1.5rem;
}

.team-member {
  text-align: center;
  padding: 1.5rem;
}

.team-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 1rem;
  border: 2px solid var(--border);
}

.team-name {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.team-role {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  color: var(--secondary);
}

/* 订阅区域 */
.subscribe-box {
  background: var(--primary);
  color: #fff;
  padding: 3rem 2rem;
  text-align: center;
  border-radius: var(--radius);
}

.subscribe-box h3 {
  color: #fff;
  margin-bottom: 0.5rem;
}

.subscribe-box p {
  color: rgba(255,255,255,0.8);
  margin-bottom: 1.5rem;
}

.subscribe-form {
  display: flex;
  max-width: 480px;
  margin: 0 auto;
  gap: 0.5rem;
}

.subscribe-form input {
  flex: 1;
  padding: 0.75rem 1rem;
  border: none;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-family: var(--font-sans);
}

.subscribe-form button {
  padding: 0.75rem 1.5rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
}

.subscribe-form button:hover {
  background: #a52020;
}

/* 页脚 */
.site-footer {
  margin-top: auto;
  background: var(--primary);
  color: rgba(255,255,255,0.7);
  padding: 3rem 0 1.5rem;
}

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

.footer-brand {
  font-size: 1.125rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.75rem;
}

.footer-desc {
  font-size: 0.875rem;
  line-height: 1.7;
}

.footer-title {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 600;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.footer-links a {
  display: block;
  font-size: 0.875rem;
  color: rgba(255,255,255,0.7);
  padding: 0.25rem 0;
}

.footer-links a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-sans);
  font-size: 0.75rem;
}

/* 伦理声明 */
.ethics-banner {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 2rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.ethics-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

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

.search-input-wrap {
  display: flex;
  border: 2px solid var(--primary);
  border-radius: var(--radius);
  overflow: hidden;
}

.search-input-wrap input {
  flex: 1;
  padding: 0.875rem 1.25rem;
  border: none;
  font-size: 1rem;
  font-family: var(--font-serif);
  outline: none;
}

.search-input-wrap button {
  padding: 0.875rem 1.5rem;
  background: var(--primary);
  color: #fff;
  border: none;
  font-size: 0.875rem;
  cursor: pointer;
}

/* FAQ */
.faq-item {
  border-bottom: 1px solid var(--border);
  padding: 1.25rem 0;
}

.faq-question {
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.faq-answer {
  margin-top: 0.75rem;
  color: var(--secondary);
  font-size: 0.9375rem;
  line-height: 1.8;
  display: none;
}

.faq-item.active .faq-answer {
  display: block;
}

/* 内页通用 */
.page-header {
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--border);
}

.page-header h1 {
  font-size: 2rem;
}

.page-header p {
  color: var(--secondary);
  font-size: 1.0625rem;
  margin-top: 0.5rem;
}

.page-content {
  padding: 2.5rem 0;
}

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

.animate-in {
  animation: fadeInUp 0.4s ease forwards;
  opacity: 0;
}

/* 响应式 */
@media (max-width: 768px) {
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.375rem; }

  .hero-headline h1 { font-size: 1.75rem; }

  .hero-layout {
    grid-template-columns: 1fr;
  }

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

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

  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg);
    flex-direction: column;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
  }

  .main-nav.active {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }

  .subscribe-form {
    flex-direction: column;
  }

  .report-download {
    flex-direction: column;
    text-align: center;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
  }

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

  .evidence-board {
    grid-template-columns: 1fr;
  }

  .ethics-banner {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
  }

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

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

  .hero-meta {
    flex-wrap: wrap;
  }
}

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