/* ============================================
   自由人的天空 - UI 增強樣式
   前台 & 後台全面優化
   ============================================ */

/* --- 設計令牌增強 --- */
:root {
  --enhance-radius-sm: 10px;
  --enhance-radius-md: 16px;
  --enhance-shadow-sm: 0 2px 8px rgba(21, 35, 52, 0.06);
  --enhance-shadow-md: 0 6px 20px rgba(21, 35, 52, 0.09);
  --enhance-shadow-hover: 0 12px 32px rgba(21, 35, 52, 0.14);
  --enhance-transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --enhance-gradient-gold: linear-gradient(135deg, #c9954a, #e0b872);
  --enhance-gradient-navy: linear-gradient(135deg, #26415c, #1a2f45);
  --enhance-gradient-brick: linear-gradient(135deg, #b85c42, #d4755a);
}

/* --- 全局排版增強 --- */
body.app-body {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* --- 卡片通用增強 --- */
.card {
  transition: var(--enhance-transition);
  border: 1px solid var(--line);
}
.card:hover {
  box-shadow: var(--enhance-shadow-hover);
  transform: translateY(-2px);
}

/* --- 文章卡片增強 --- */
.article-card {
  border-radius: var(--enhance-radius-md);
  overflow: hidden;
  background: var(--card);
  border: 1px solid var(--line);
  transition: var(--enhance-transition);
  position: relative;
}
.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--enhance-shadow-hover);
}
.article-card .cover {
  position: relative;
  overflow: hidden;
}
.article-card .cover img {
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}
.article-card:hover .cover img {
  transform: scale(1.06);
}
.article-card .cover::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(0,0,0,0.15));
  opacity: 0;
  transition: opacity 0.3s;
}
.article-card:hover .cover::after {
  opacity: 1;
}

/* --- 分類徽章增強 --- */
[class^="badge-"] {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
  backdrop-filter: blur(8px);
  transition: var(--enhance-transition);
}
.badge-ink { background: rgba(38, 65, 92, 0.85); color: #fff; }
.badge-navy { background: rgba(21, 35, 52, 0.85); color: #fff; }
.badge-warm { background: rgba(184, 92, 66, 0.85); color: #fff; }
.badge-emerald { background: rgba(70, 120, 80, 0.85); color: #fff; }
.badge-gold { background: rgba(201, 149, 74, 0.9); color: #fff; }

/* --- 文章正文排版增強 --- */
.prose {
  font-size: 16px;
  line-height: 1.9;
  color: var(--text);
  letter-spacing: 0.01em;
}
.prose p {
  margin-bottom: 1.4em;
  text-align: justify;
}
.prose p:first-of-type::first-letter {
  font-family: var(--serif);
  font-size: 3.2em;
  float: left;
  line-height: 0.9;
  padding-right: 8px;
  padding-top: 4px;
  color: var(--brick);
  font-weight: 700;
}
.prose h2 {
  font-family: var(--serif);
  font-size: 1.5em;
  margin: 2em 0 0.8em;
  padding-bottom: 0.4em;
  border-bottom: 2px solid var(--gold);
  color: var(--navy);
}
.prose h3 {
  font-family: var(--serif);
  font-size: 1.25em;
  margin: 1.6em 0 0.6em;
  color: var(--navy);
}
.prose blockquote {
  margin: 1.5em 0;
  padding: 16px 24px;
  border-left: 4px solid var(--gold);
  background: rgba(201, 149, 74, 0.08);
  border-radius: 0 12px 12px 0;
  font-style: italic;
  color: var(--muted);
}
.prose img {
  border-radius: 12px;
  box-shadow: var(--enhance-shadow-md);
  margin: 1.5em 0;
}
.prose a {
  color: var(--brick);
  text-decoration: none;
  border-bottom: 1px dashed var(--brick);
  transition: var(--enhance-transition);
}
.prose a:hover {
  color: var(--navy);
  border-bottom-color: var(--navy);
}

/* --- 頂部導航增強 --- */
.top-nav a {
  position: relative;
  transition: var(--enhance-transition);
}
.top-nav a::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gold);
  transition: all 0.3s ease;
  transform: translateX(-50%);
}
.top-nav a:hover::before,
.top-nav a.is-on::before {
  width: 60%;
}
.top-nav a.is-on {
  color: var(--navy);
  font-weight: 600;
}

/* --- 側邊欄增強 --- */
.sidebar {
  position: sticky;
  top: 90px;
  align-self: flex-start;
  max-height: calc(100vh - 110px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}
.sidebar::-webkit-scrollbar {
  width: 4px;
}
.sidebar::-webkit-scrollbar-thumb {
  background: var(--line);
  border-radius: 2px;
}
.side-nav .label {
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--gold);
  font-weight: 700;
  padding: 12px 0 6px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 4px;
}
.side-nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: 10px;
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
  transition: var(--enhance-transition);
  position: relative;
}
.side-nav a:hover {
  background: rgba(38, 65, 92, 0.06);
  color: var(--navy);
  padding-left: 16px;
}
.side-nav a.is-on {
  background: linear-gradient(90deg, rgba(38, 65, 92, 0.1), transparent);
  color: var(--navy);
  font-weight: 600;
}
.side-nav a.is-on::before {
  content: '';
  position: absolute;
  left: 0;
  top: 20%;
  height: 60%;
  width: 3px;
  background: var(--gold);
  border-radius: 0 2px 2px 0;
}
.side-nav a i {
  width: 18px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}
.side-nav a:hover i {
  color: var(--gold);
}

/* --- 作者卡片增強 --- */
.profile {
  background: var(--card);
  border-radius: var(--enhance-radius-md);
  padding: 20px 16px;
  border: 1px solid var(--line);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.profile::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--enhance-gradient-gold);
}
.avatar-wrap {
  position: relative;
  width: 72px;
  height: 72px;
  margin: 0 auto 12px;
}
.avatar-wrap img {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--card);
  box-shadow: 0 0 0 2px var(--gold), var(--enhance-shadow-md);
}

/* --- 熱門文章排行增強 --- */
.book-card {
  background: var(--card);
  border-radius: var(--enhance-radius-md);
  padding: 16px;
  border: 1px solid var(--line);
}
.rank-list .rank-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px solid rgba(38, 65, 92, 0.06);
  transition: var(--enhance-transition);
}
.rank-list .rank-row:last-child {
  border-bottom: none;
}
.rank-list .rank-row:hover {
  padding-left: 4px;
}
.rank-num {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  display: grid;
  place-items: center;
  font-size: 11px;
  font-weight: 700;
  background: rgba(38, 65, 92, 0.08);
  color: var(--navy);
  flex-shrink: 0;
}
.rank-list .rank-row:nth-child(1) .rank-num {
  background: var(--enhance-gradient-gold);
  color: #fff;
}
.rank-list .rank-row:nth-child(2) .rank-num {
  background: linear-gradient(135deg, #b0b0b0, #d0d0d0);
  color: #fff;
}
.rank-list .rank-row:nth-child(3) .rank-num {
  background: linear-gradient(135deg, #cd7f32, #e0a060);
  color: #fff;
}

/* --- 按鈕增強 --- */
.btn {
  position: relative;
  overflow: hidden;
}
.btn::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255,255,255,0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.4s, height 0.4s;
}
.btn:active::after {
  width: 200px;
  height: 200px;
}
.btn-navy {
  background: var(--enhance-gradient-navy);
  box-shadow: 0 4px 14px rgba(38, 65, 92, 0.3);
}
.btn-navy:hover {
  box-shadow: 0 6px 20px rgba(38, 65, 92, 0.4);
}
.btn-brick {
  background: var(--enhance-gradient-brick);
  box-shadow: 0 4px 14px rgba(184, 92, 66, 0.3);
}

/* --- 分類頁面增強 --- */
.category-header {
  background: var(--card);
  border-radius: var(--radius);
  padding: 32px;
  margin-bottom: 24px;
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}
.category-header::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(201, 149, 74, 0.1), transparent 70%);
  border-radius: 50%;
}
.category-header h1 {
  font-family: var(--serif);
  font-size: 2em;
  margin: 0 0 8px;
  color: var(--navy);
}
.category-header p {
  color: var(--muted);
  margin: 0;
  font-size: 15px;
}

/* --- 分頁增強 --- */
.pager a, .pager span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 38px;
  height: 38px;
  padding: 0 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: var(--enhance-transition);
}
.pager a:hover {
  border-color: var(--gold);
  color: var(--navy);
  transform: translateY(-1px);
  box-shadow: var(--enhance-shadow-sm);
}
.pager .current {
  background: var(--enhance-gradient-navy);
  color: #fff;
  border-color: transparent;
  font-weight: 600;
}

/* ============================================
   後台管理界面增強
   ============================================ */

.admin-shell {
  display: flex;
  min-height: 100vh;
  background: var(--paper);
}

/* --- 後台側邊欄 --- */
.admin-side {
  width: 240px;
  background: var(--enhance-gradient-navy);
  color: rgba(255,255,255,0.85);
  padding: 0;
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  flex-shrink: 0;
}
.admin-side > a:first-child {
  display: block;
  padding: 20px 18px;
  color: #fff;
  text-decoration: none;
  font-size: 17px;
  font-weight: 600;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  background: rgba(0,0,0,0.15);
  letter-spacing: 0.02em;
}
.admin-side .grp {
  padding: 16px 18px 6px;
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  font-weight: 700;
}
.admin-side a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  color: rgba(255,255,255,0.75);
  text-decoration: none;
  font-size: 14px;
  transition: all 0.2s ease;
  position: relative;
  border-left: 3px solid transparent;
}
.admin-side a:hover {
  background: rgba(255,255,255,0.08);
  color: #fff;
  padding-left: 22px;
}
.admin-side a.is-on {
  background: rgba(255,255,255,0.12);
  color: #fff;
  border-left-color: var(--gold);
  font-weight: 600;
}
.admin-side a i {
  width: 18px;
  text-align: center;
  font-size: 14px;
  opacity: 0.8;
}
.admin-side a .badge-num {
  margin-left: auto;
  background: var(--brick);
  color: #fff;
  font-size: 11px;
  padding: 1px 7px;
  border-radius: 999px;
  font-weight: 600;
}

/* --- 後台主內容區 --- */
.admin-main {
  flex: 1;
  padding: 28px 32px;
  min-width: 0;
}
.admin-main h1, .admin-main h2 {
  font-family: var(--serif);
  color: var(--navy);
}

/* --- 後台統計卡片 --- */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.stat-card {
  background: var(--card);
  border-radius: var(--enhance-radius-md);
  padding: 20px;
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  gap: 16px;
  transition: var(--enhance-transition);
}
.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--enhance-shadow-md);
}
.stat-card .stat-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  font-size: 22px;
  color: #fff;
  flex-shrink: 0;
}
.stat-card .stat-icon.navy { background: var(--enhance-gradient-navy); }
.stat-card .stat-icon.gold { background: var(--enhance-gradient-gold); }
.stat-card .stat-icon.brick { background: var(--enhance-gradient-brick); }
.stat-card .stat-icon.emerald { background: linear-gradient(135deg, #467850, #5a9466); }
.stat-card .stat-num {
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 700;
  color: var(--navy);
  line-height: 1;
}
.stat-card .stat-label {
  font-size: 13px;
  color: var(--muted);
  margin-top: 4px;
}

/* --- 後台表格增強 --- */
.admin-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--card);
  border-radius: var(--enhance-radius-md);
  overflow: hidden;
  border: 1px solid var(--line);
}
.admin-table th {
  background: linear-gradient(180deg, rgba(38, 65, 92, 0.06), rgba(38, 65, 92, 0.03));
  padding: 14px 16px;
  text-align: left;
  font-size: 13px;
  font-weight: 600;
  color: var(--navy);
  border-bottom: 2px solid var(--line);
  letter-spacing: 0.02em;
}
.admin-table td {
  padding: 12px 16px;
  border-bottom: 1px solid rgba(38, 65, 92, 0.06);
  font-size: 14px;
  vertical-align: middle;
}
.admin-table tr:last-child td {
  border-bottom: none;
}
.admin-table tbody tr {
  transition: background 0.15s ease;
}
.admin-table tbody tr:hover {
  background: rgba(38, 65, 92, 0.03);
}

/* --- 後台表單增強 --- */
.admin-main input[type="text"],
.admin-main input[type="email"],
.admin-main input[type="password"],
.admin-main input[type="url"],
.admin-main input[type="number"],
.admin-main textarea,
.admin-main select {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: 14px;
  font-family: var(--sans);
  background: var(--card);
  color: var(--text);
  transition: var(--enhance-transition);
  box-sizing: border-box;
}
.admin-main input:focus,
.admin-main textarea:focus,
.admin-main select:focus {
  outline: none;
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(201, 149, 74, 0.15);
}
.admin-main label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 6px;
}
.admin-main .form-group {
  margin-bottom: 18px;
}
.admin-main .form-hint {
  font-size: 12px;
  color: var(--muted);
  margin-top: 4px;
}

/* --- 後台操作按鈕組 --- */
.admin-actions {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--enhance-radius-md);
  padding: 14px 18px;
  box-shadow: 0 -4px 12px rgba(0,0,0,0.03);
}

/* --- 閃爍消息增強 --- */
.flash {
  padding: 14px 18px;
  border-radius: 12px;
  margin-bottom: 16px;
  font-size: 14px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 10px;
  animation: slideIn 0.3s ease;
}
@keyframes slideIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}
.flash.success {
  background: rgba(70, 120, 80, 0.1);
  color: #3c6b45;
  border: 1px solid rgba(70, 120, 80, 0.2);
}
.flash.error {
  background: rgba(184, 92, 66, 0.1);
  color: var(--brick);
  border: 1px solid rgba(184, 92, 66, 0.2);
}

/* --- 頁尾增強 --- */
.site-footer {
  margin-top: 48px;
  background: linear-gradient(180deg, transparent, rgba(38, 65, 92, 0.04));
  border-top: 1px solid var(--line);
}
.foot-grid h3, .foot-grid h4 {
  font-family: var(--serif);
  color: var(--navy);
}
.foot-grid a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
}
.foot-grid a:hover {
  color: var(--brick);
}

/* --- 響應式優化 --- */
@media (max-width: 900px) {
  .admin-side {
    width: 60px;
    overflow: hidden;
  }
  .admin-side a span,
  .admin-side .grp,
  .admin-side > a:first-child {
    display: none;
  }
  .admin-side a {
    justify-content: center;
    padding: 14px;
  }
  .admin-main {
    padding: 16px;
  }
}

@media (max-width: 768px) {
  .prose {
    font-size: 15px;
  }
  .prose p:first-of-type::first-letter {
    font-size: 2.5em;
  }
  .article-body {
    padding: 20px 16px;
  }
  .lead-card {
    grid-template-columns: 1fr;
  }
  .lead-media {
    min-height: 180px;
  }
}

/* --- 滾動條美化 --- */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: rgba(38, 65, 92, 0.15);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(38, 65, 92, 0.25);
}

/* --- 選取文字顏色 --- */
::selection {
  background: rgba(201, 149, 74, 0.3);
  color: var(--navy);
}