/* ===================================================
   FanNews Modern Responsive UI CSS
   v2.0 (Mobile First & Modern Design)
   =================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  --bg-primary: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-hover: #f1f5f9;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-sub: #94a3b8;
  --border-color: #e2e8f0;
  --color-primary: #3b82f6;
  --color-primary-hover: #2563eb;
  --color-primary-light: #eff6ff;
  --color-news: #0284c7;
  --color-news-bg: #e0f2fe;
  --color-matome: #ea580c;
  --color-matome-bg: #ffedd5;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.07);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.08);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #0b0f19;
    --bg-surface: #151d2f;
    --bg-surface-hover: #1e293b;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --text-sub: #64748b;
    --border-color: #1e293b;
    --color-primary: #60a5fa;
    --color-primary-hover: #93c5fd;
    --color-primary-light: #1e293b;
    --color-news-bg: #0c4a6e;
    --color-news: #38bdf8;
    --color-matome-bg: #7c2d12;
    --color-matome: #fb923c;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.5);
  }
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

.fn-header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.fn-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.fn-logo-img {
  height: 36px;
  width: auto;
  max-height: 38px;
  display: block;
}

.fn-site-title {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--color-primary);
}

.fn-nav-links {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.fn-nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-md);
  color: var(--text-muted);
  background: var(--bg-surface-hover);
  transition: all 0.2s ease;
}

.fn-nav-btn:hover {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

/* ================== Page Layout ================== */
.fn-container {
  max-width: 1200px;
  margin: 1.5rem auto;
  padding: 0 1rem;
}

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

@media (min-width: 900px) {
  .fn-grid {
    grid-template-columns: 1fr 340px;
  }
}

/* ================== Main Content Area ================== */
.fn-main {
  min-width: 0;
}

/* Title & Meta Header */
.fn-page-header {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  box-shadow: var(--shadow-sm);
}

.fn-group-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border-color);
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}

.fn-group-info h1 {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 0.25rem;
}

.fn-group-info p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Category Filter Tabs */
.fn-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  overflow-x: auto;
  padding-bottom: 0.25rem;
  -webkit-overflow-scrolling: touch;
}

.fn-tab {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 9999px;
  background: var(--bg-surface);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s ease;
}

.fn-tab:hover {
  background: var(--bg-surface-hover);
  color: var(--text-main);
}

.fn-tab.active {
  background: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

/* ================== Article Cards ================== */
.fn-articles {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.fn-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1rem;
  display: flex;
  gap: 1rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.fn-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.fn-card-thumb {
  width: 105px;
  height: 75px;
  flex-shrink: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-surface-hover);
  display: flex;
  align-items: center;
  justify-content: center;
}

@media (min-width: 640px) {
  .fn-card-thumb {
    width: 130px;
    height: 85px;
  }
}

.fn-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.fn-card:hover .fn-card-thumb img {
  transform: scale(1.05);
}

.fn-card-content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.fn-card-title {
  font-size: 0.975rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.45;
  margin-bottom: 0.4rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color 0.15s ease;
}

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

.fn-card-desc {
  font-size: 0.825rem;
  color: var(--text-muted);
  line-height: 1.4;
  margin-bottom: 0.4rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

@media (max-width: 500px) {
  .fn-card-desc {
    display: none;
  }
}

.fn-card-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.775rem;
}

.fn-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.725rem;
}

.fn-badge-news {
  background: var(--color-news-bg);
  color: var(--color-news);
}

.fn-badge-matome {
  background: var(--color-matome-bg);
  color: var(--color-matome);
}

.fn-source {
  color: var(--text-muted);
  font-weight: 500;
}

.fn-time {
  color: var(--text-sub);
  margin-left: auto;
}

/* ================== Sidebar ================== */
.fn-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.fn-widget {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
}

.fn-widget-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  border-bottom: 2px solid var(--color-primary-light);
  padding-bottom: 0.4rem;
}

/* Related Groups in Sidebar */
.fn-quick-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.fn-quick-pill {
  font-size: 0.8rem;
  padding: 0.35rem 0.7rem;
  border-radius: var(--radius-sm);
  background: var(--bg-surface-hover);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  transition: all 0.15s ease;
}

.fn-quick-pill:hover {
  background: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
}

/* Ad Card */
.fn-ad-box {
  margin: 0.5rem 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  text-align: center;
}

.fn-ad-label {
  font-size: 0.65rem;
  color: var(--text-sub);
  text-align: right;
  margin-bottom: 0.2rem;
}

/* Rakuten Ad Card */
.fn-ad-product {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem;
  border-radius: var(--radius-md);
  background: var(--bg-surface-hover);
  border: 1px solid var(--border-color);
  margin-bottom: 0.5rem;
  transition: background 0.15s ease;
}

.fn-ad-product:hover {
  background: var(--border-color);
}

.fn-ad-product img {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  flex-shrink: 0;
}

.fn-ad-product-title {
  font-size: 0.8rem;
  color: var(--text-main);
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ================== Top Page (Group Grid) ================== */
.fn-search-wrap {
  margin-bottom: 1.5rem;
}

.fn-search-box {
  width: 100%;
  padding: 0.85rem 1.25rem;
  font-size: 1rem;
  border-radius: var(--radius-lg);
  border: 2px solid var(--border-color);
  background: var(--bg-surface);
  color: var(--text-main);
  outline: none;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.fn-search-box:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.15);
}

.fn-section-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 1.5rem 0 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.fn-group-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 0.85rem;
}

@media (min-width: 640px) {
  .fn-group-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1rem;
  }
}

.fn-group-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1rem 0.5rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
  box-shadow: var(--shadow-sm);
  position: relative;
}

.fn-group-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.fn-group-card-img {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 0.5rem;
  border: 2px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease;
}

.fn-group-card:hover .fn-group-card-img {
  transform: scale(1.08);
}

.fn-group-card-name {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.3;
}

/* ================== Category Tabs ================== */
.fn-category-nav {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding: 0.25rem 0.25rem 0.75rem;
  margin-bottom: 1.5rem;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.fn-category-nav::-webkit-scrollbar {
  display: none;
}
.fn-category-tab {
  display: inline-flex;
  align-items: center;
  padding: 0.45rem 1rem;
  border-radius: 9999px;
  border: 1px solid var(--border-color);
  background: var(--bg-surface);
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s ease;
  user-select: none;
}
.fn-category-tab:hover {
  background: var(--bg-surface-hover);
  color: var(--text-main);
  border-color: var(--color-primary);
}
.fn-category-tab.active {
  background: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
  box-shadow: 0 2px 4px rgb(59 130 246 / 0.3);
}

/* ================== Favorite (推しグループ) ================== */
.fn-fav-section {
  margin-bottom: 2rem;
  padding: 1.25rem;
  background: linear-gradient(135deg, rgba(239, 246, 255, 0.6) 0%, rgba(254, 243, 199, 0.4) 100%);
  border: 1px dashed #f59e0b;
  border-radius: var(--radius-lg);
}
@media (prefers-color-scheme: dark) {
  .fn-fav-section {
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.6) 0%, rgba(69, 44, 21, 0.4) 100%);
    border-color: #d97706;
  }
}
.fn-fav-title {
  font-size: 1rem;
  font-weight: 700;
  color: #b45309;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}
@media (prefers-color-scheme: dark) {
  .fn-fav-title {
    color: #fbbf24;
  }
}
.fn-fav-card-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.15rem;
  line-height: 1;
  padding: 4px;
  color: var(--text-sub);
  transition: color 0.15s ease, transform 0.15s ease;
  position: absolute;
  top: 6px;
  right: 6px;
  z-index: 2;
}
.fn-fav-card-btn:hover {
  transform: scale(1.2);
}
.fn-fav-card-btn.active {
  color: #f59e0b;
}

/* ================== SNS Share Bar ================== */
.fn-share-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 1rem 0;
  flex-wrap: wrap;
}
.fn-share-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
}
.fn-share-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  color: #ffffff;
  text-decoration: none;
  transition: opacity 0.15s ease, transform 0.15s ease;
}
.fn-share-btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}
.fn-share-x {
  background-color: #000000;
}
.fn-share-line {
  background-color: #06c755;
}
.fn-fav-page-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  cursor: pointer;
  transition: all 0.15s ease;
}
.fn-fav-page-btn.active {
  border-color: #f59e0b;
  color: #b45309;
  background: #fef3c7;
}
@media (prefers-color-scheme: dark) {
  .fn-fav-page-btn.active {
    background: #451a03;
    color: #fbbf24;
  }
}

/* ================== Footer ================== */
.fn-footer {
  margin-top: 3rem;
  padding: 2rem 1rem;
  border-top: 1px solid var(--border-color);
  background: var(--bg-surface);
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}