/* ============================================
   广谱 · 媒体站样式
   碳灰配色
   ============================================ */

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

:root {
  --brand-carbon: #1A1D20;
  --brand-carbon-light: #2C3035;
  --bg-page: #F6F8FA;
  --bg-card: #ffffff;
  --text-primary: #1a1a1a;
  --text-secondary: #555;
  --text-muted: #888;
  --border-light: #e0e3e6;
  --accent-blue: #0044BB;
  --accent-green: #00FF66;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ========== 头部品牌栏 ========== */
.site-header {
  background: var(--brand-carbon);
  text-align: center;
  padding: 18px 20px 0;
}

.header-inner {
  max-width: 500px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.brand-subtitle {
  font-size: 11px;
  color: rgba(255,255,255,0.7);
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 4px;
  position: relative;
  z-index: 3;
  order: 0;
}

.brand-name {
  font-size: 26px;
  font-weight: 300;
  color: #fff;
  letter-spacing: 10px;
  font-family: "YouYuan", "幼圆", "STYuanti", "PingFang SC", "Microsoft YaHei", sans-serif;
  margin-bottom: 6px;
  position: relative;
  z-index: 3;
  order: 1;
}

.brand-logo-svg {
  display: block;
  width: 100%;
  max-width: 500px;
  height: auto;
  margin-top: 8px;
  margin-bottom: -160px;
  opacity: 1;
  order: 2;
  overflow: visible;
}

/* ========== 主内容区 ========== */
.container {
  max-width: 600px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

/* 专题介绍 */
.section-intro {
  background: #fff;
  border-left: 3px solid var(--accent-green);
  padding: 18px 22px;
  margin-bottom: 28px;
  border-radius: 0 6px 6px 0;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.section-intro strong {
  color: var(--text-primary);
  letter-spacing: 1px;
}

.section-intro .tag {
  display: inline;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: 1px;
}

.section-intro .tag .pipe {
  margin: 0 6px;
  opacity: 0.3;
  font-weight: 400;
}

/* 文章列表 */
.article-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.article-card {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--bg-card);
  border-radius: 8px;
  padding: 20px 22px;
  border: 1px solid var(--border-light);
  transition: box-shadow 0.2s, border-color 0.2s;
}

.article-card:hover {
  box-shadow: 0 4px 20px rgba(0,0,0,0.07);
  border-color: var(--brand-carbon);
}

.article-card:active {
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.card-num {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 3px;
  margin-bottom: 4px;
  text-transform: uppercase;
}

.card-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.4;
}

.card-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 12px;
  font-size: 11px;
  color: var(--text-muted);
  border-top: 1px solid var(--border-light);
  padding-top: 12px;
}

.card-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ========== 页脚 ========== */
.site-footer {
  text-align: center;
}

.site-footer .footer-tagline-bar {
  background: #00FF66;
  color: #000;
  font-size: 12px;
  font-weight: 600;
  padding: 9px 14px;
  letter-spacing: 1px;
}

.site-footer .footer-tagline-bar .pipe {
  opacity: 0.25;
  margin: 0 6px;
}

.site-footer .footer-tagline-bar .footer-the {
  font-weight: 700;
  letter-spacing: 1px;
}

.site-footer .footer-links {
  padding: 14px 20px;
  font-size: 13px;
  background: #fff;
  color: var(--text-muted);
  display: flex;
  justify-content: center;
  gap: 24px;
  align-items: center;
}

.site-footer .footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.site-footer .footer-links a:hover {
  color: #000;
}

.site-footer .footer-links svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* ========== 文章页底部导航 ========== */
.article-bottom-nav {
  max-width: 600px;
  margin: 40px auto 0;
  padding: 0 20px;
  text-align: center;
}

.article-bottom-nav .back-btn {
  display: inline-block;
  padding: 12px 32px;
  background: var(--brand-carbon);
  color: #fff;
  text-decoration: none;
  border-radius: 4px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 2px;
  transition: background 0.2s;
  margin-bottom: 20px;
}

.article-bottom-nav .back-btn:hover {
  background: var(--brand-carbon-light);
}

.article-bottom-nav .social-row {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 20px;
}

.article-bottom-nav .social-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 1px solid #d0d4d8;
  border-radius: 4px;
  font-size: 13px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: border-color 0.2s, background 0.2s;
}

.article-bottom-nav .social-link:hover {
  border-color: var(--brand-carbon);
  background: #f0f1f3;
}

.article-bottom-nav .social-link svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.article-bottom-nav .brand-line {
  font-size: 16px;
  font-weight: 700;
  color: var(--brand-carbon);
  letter-spacing: 4px;
  margin-bottom: 6px;
}

.article-bottom-nav .brand-tagline {
  display: none;
}

/* ========== 响应式 ========== */
@media (max-width: 480px) {
  .site-header { padding: 26px 16px 22px; }
  .brand-mark { width: 48px; height: 48px; line-height: 48px; font-size: 24px; }
  .brand-name { font-size: 20px; letter-spacing: 4px; }
  .article-card { padding: 16px 18px; }
  .card-title { font-size: 16px; }
  .container { padding: 18px 12px 36px; }
}

@media (min-width: 800px) {
  .container { padding: 32px 16px 56px; }
}