/* ===== CSS Variables & Reset ===== */
:root {
  --color-primary: #c41e3a;
  --color-primary-dark: #9e1830;
  --color-text: #1a1a1a;
  --color-text-secondary: #666;
  --color-text-muted: #999;
  --color-bg: #f5f5f7;
  --color-surface: #ffffff;
  --color-border: #e8e8e8;
  --color-accent: #2563eb;
  --font-serif: 'Noto Serif SC', 'Source Han Serif SC', Georgia, serif;
  --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --header-height: 60px;
  --max-width: 1200px;
  --article-width: 720px;
  --transition: 0.25s ease;
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

ul {
  list-style: none;
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  height: var(--header-height);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--color-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: -0.5px;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.5px;
}

.logo-text span {
  color: var(--color-primary);
}

/* Desktop Nav */
.nav-desktop {
  display: none;
}

.nav-desktop ul {
  display: flex;
  gap: 8px;
}

.nav-desktop a {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  transition: all var(--transition);
}

.nav-desktop a:hover,
.nav-desktop a.active {
  color: var(--color-primary);
  background: rgba(196, 30, 58, 0.06);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.menu-toggle:hover {
  background: var(--color-bg);
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

.menu-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.menu-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Nav */
.nav-mobile {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-surface);
  padding: 16px 20px;
  overflow-y: auto;
  z-index: 99;
}

.nav-mobile.open {
  display: block;
}

.nav-mobile ul {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-mobile a {
  display: block;
  padding: 14px 16px;
  font-size: 1rem;
  border-radius: var(--radius-md);
  color: var(--color-text);
  transition: background var(--transition);
}

.nav-mobile a:hover,
.nav-mobile a.active {
  background: rgba(196, 30, 58, 0.06);
  color: var(--color-primary);
}

/* ===== Main Content ===== */
.main-content {
  flex: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 20px 48px;
  width: 100%;
}

/* ===== Hero Section ===== */
.hero {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  border-radius: var(--radius-lg);
  padding: 40px 28px;
  margin-bottom: 32px;
  color: #fff;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(ellipse, rgba(196, 30, 58, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-tag {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 16px;
  letter-spacing: 1px;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 12px;
}

.hero-summary {
  font-size: 0.95rem;
  opacity: 0.85;
  line-height: 1.7;
  margin-bottom: 20px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.8rem;
  opacity: 0.7;
}

.hero-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 20px;
  padding: 10px 20px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-sm);
  color: #fff;
  font-size: 0.9rem;
  transition: all var(--transition);
}

.hero-link:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* ===== Category Tabs ===== */
.category-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  margin-bottom: 24px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.category-tabs::-webkit-scrollbar {
  display: none;
}

.category-tab {
  flex-shrink: 0;
  padding: 8px 18px;
  border-radius: 20px;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
  white-space: nowrap;
  text-decoration: none;
  display: inline-block;
}

.category-tab:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.category-tab.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* ===== Section Title ===== */
.section-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 20px;
  padding-left: 12px;
  border-left: 3px solid var(--color-primary);
}

/* ===== News Grid ===== */
.news-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.news-card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

.news-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.news-card-image {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--color-border);
}

.news-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.news-card:hover .news-card-image img {
  transform: scale(1.03);
}

.news-card-category {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  color: #fff;
  font-size: 0.7rem;
  padding: 3px 10px;
  border-radius: 4px;
}

.news-card-body {
  padding: 16px 18px 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.news-card-title {
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color var(--transition);
}

.news-card:hover .news-card-title {
  color: var(--color-primary);
}

.news-card-summary {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.news-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
}

/* ===== Article Page ===== */
.article-container {
  max-width: var(--article-width);
  margin: 0 auto;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
  padding: 6px 0;
  transition: color var(--transition);
}

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

.article-header {
  margin-bottom: 32px;
}

.article-category {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.article-category a {
  color: var(--color-primary);
  text-decoration: none;
}

.article-category a:hover {
  text-decoration: underline;
}


.article-title {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 16px;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
}

.article-cover {
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 32px;
  box-shadow: var(--shadow-md);
}

.article-cover img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.article-body {
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  line-height: 1.9;
  color: #333;
}

.article-body p {
  margin-bottom: 1.5em;
  text-align: justify;
}

.article-body h2 {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 700;
  margin: 2em 0 1em;
  padding-left: 12px;
  border-left: 3px solid var(--color-primary);
}

.article-figure {
  margin: 2em 0;
}

.article-figure img {
  width: 100%;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.article-figure figcaption {
  text-align: center;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 10px;
  line-height: 1.5;
}

.article-footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.article-footer p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.btn-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 24px;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  transition: background var(--transition);
}

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

/* ===== Related Articles ===== */
.related-section {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.related-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.related-card {
  display: flex;
  gap: 14px;
  padding: 12px;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  transition: box-shadow var(--transition);
}

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

.related-card img {
  width: 100px;
  height: 72px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.related-card-body {
  flex: 1;
  min-width: 0;
}

.related-card-title {
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 6px;
}

.related-card-date {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* ===== Footer ===== */
.site-footer {
  background: #1a1a2e;
  color: rgba(255, 255, 255, 0.7);
  padding: 32px 20px;
  margin-top: auto;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}

.footer-logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

.footer-logo span {
  color: var(--color-primary);
}

.footer-desc {
  font-size: 0.85rem;
  margin-bottom: 16px;
}

.footer-copy {
  font-size: 0.75rem;
  opacity: 0.5;
}

/* ===== Pagination ===== */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  flex-wrap: wrap;
}

.pagination-info {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.pagination-btn {
  display: inline-flex;
  align-items: center;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  text-decoration: none;
  transition: all var(--transition);
}

.pagination-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

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

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

/* ===== Error 404 Page ===== */
.error-page {
  text-align: center;
  padding: 80px 20px 100px;
}

.error-code {
  font-size: 5rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 16px;
  opacity: 0.9;
}

.error-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.error-desc {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  margin-bottom: 32px;
}

.error-actions .btn-back {
  display: inline-flex;
}

/* ===== Loading & Empty States ===== */
.loading {
  text-align: center;
  padding: 60px 20px;
  color: var(--color-text-muted);
}

.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--color-text-muted);
}

.empty-state svg {
  width: 64px;
  height: 64px;
  margin-bottom: 16px;
  opacity: 0.3;
}

/* ===== Tablet (>= 640px) ===== */
@media (min-width: 640px) {
  .hero {
    padding: 48px 40px;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .news-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

  .article-title {
    font-size: 2rem;
  }

  .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ===== Desktop (>= 1024px) ===== */
@media (min-width: 1024px) {
  :root {
    --header-height: 64px;
  }

  .menu-toggle {
    display: none;
  }

  .nav-desktop {
    display: block;
  }

  .nav-mobile {
    display: none !important;
  }

  .main-content {
    padding: 32px 24px 64px;
  }

  .hero {
    padding: 56px 48px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-image {
    border-radius: var(--radius-md);
    overflow: hidden;
    aspect-ratio: 16 / 10;
  }

  .hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }

  .news-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
  }

  .news-card-title {
    font-size: 1.1rem;
  }

  .article-body {
    font-size: 1.125rem;
  }

  .related-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ===== Large Desktop (>= 1280px) ===== */
@media (min-width: 1280px) {
  .hero-title {
    font-size: 2.25rem;
  }
}