/* ═══════════ 主题变量 ═══════════ */
:root {
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --primary-light: #eff6ff;
  --accent: #8b5cf6;
  --text: #1e293b;
  --text-secondary: #64748b;
  --text-tertiary: #94a3b8;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --card-hover: #f1f5f9;
  --border: #e2e8f0;
  --border-hover: #cbd5e1;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --transition: all 0.2s ease;
}

[data-theme="dark"] {
  --primary: #60a5fa;
  --primary-hover: #93c5fd;
  --primary-light: #1e3a5f;
  --accent: #a78bfa;
  --text: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-tertiary: #64748b;
  --bg: #0f172a;
  --card-bg: #1e293b;
  --card-hover: #334155;
  --border: #334155;
  --border-hover: #475569;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
               "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  transition: background 0.3s, color 0.3s;
}

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

/* ═══════════ 顶部工具栏 ═══════════ */
.top-bar {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  font-size: 12px;
}
.top-bar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 6px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.top-left a { margin-right: 16px; color: var(--text-secondary); }
.top-left a:hover { color: var(--primary); }
.top-right { display: flex; align-items: center; gap: 10px; }
#clockDisplay { color: var(--text-tertiary); font-variant-numeric: tabular-nums; }
.theme-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 2px 8px;
  cursor: pointer;
  font-size: 14px;
  transition: var(--transition);
}
.theme-btn:hover { background: var(--card-hover); }

/* ═══════════ 头部 ═══════════ */
.site-header {
  background: var(--card-bg);
  padding: 20px 0 16px;
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 36px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  border-radius: 10px;
  font-size: 20px;
  font-weight: 900;
}
.logo-text {
  font-size: 24px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.5px;
}

.search-area { flex: 1; min-width: 0; }
.search-box {
  display: flex;
  align-items: center;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  overflow: hidden;
  transition: var(--transition);
}
.search-box:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(59,130,246,0.1);
}
.search-icon { padding: 0 12px; font-size: 14px; color: var(--text-tertiary); }
.search-box input {
  flex: 1;
  padding: 10px 0;
  border: none;
  background: transparent;
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
  outline: none;
}
.search-box input::placeholder { color: var(--text-tertiary); }
.search-box button {
  padding: 10px 24px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  border: none;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  transition: var(--transition);
}
.search-box button:hover { filter: brightness(1.1); }

.hot-words {
  margin-top: 8px;
  font-size: 12px;
  color: var(--text-tertiary);
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.hot-words span { color: var(--accent); font-weight: 600; }
.hot-words a { color: var(--text-secondary); }
.hot-words a:hover { color: var(--primary); }

/* ═══════════ 分类导航栏（可折叠） ═══════════ */
.cat-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--card-bg);
  border-bottom: 2px solid var(--primary);
  box-shadow: var(--shadow-sm);
}

.cat-nav-wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
  overflow: hidden;
  max-height: 92px;                 /* 约两行高度 */
  transition: max-height 0.35s ease;
}

.cat-nav.expanded .cat-nav-wrap {
  max-height: 2000px;
}

/* 折叠时底部渐隐遮罩 */
.cat-nav:not(.expanded) .cat-nav-wrap::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 36px;
  background: linear-gradient(180deg, transparent, var(--card-bg) 85%);
  pointer-events: none;
}

.cat-nav-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  padding-bottom: 4px;
}

.cat-nav-item {
  padding: 11px 20px;
  font-size: 13.5px;
  color: var(--text-secondary);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: var(--transition);
  white-space: nowrap;
  font-weight: 500;
  flex-shrink: 0;
}
.cat-nav-item:hover { color: var(--primary); background: var(--primary-light); }
.cat-nav-item.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  font-weight: 700;
}

/* 展开按钮 */
.cat-nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 100%;
  padding: 7px 0;
  background: var(--card-bg);
  border: none;
  border-top: 1px solid var(--border);
  color: var(--primary);
  font-size: 12.5px;
  font-family: inherit;
  cursor: pointer;
  transition: var(--transition);
}
.cat-nav-toggle:hover { background: var(--primary-light); }
.cat-nav-toggle .toggle-icon {
  display: inline-block;
  font-size: 10px;
  transition: transform 0.3s;
}
.cat-nav.expanded .cat-nav-toggle .toggle-icon {
  transform: rotate(180deg);
}

/* ═══════════ 主内容 ═══════════ */
.main-content {
  max-width: 1200px;
  margin: 20px auto;
  padding: 0 20px;
}

/* ═══════════ 分类区块 ═══════════ */
.site-section {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 16px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.site-section:hover { box-shadow: var(--shadow-md); }
.section-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 14px;
  padding-left: 12px;
  border-left: 4px solid var(--primary);
  line-height: 1.2;
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.section-title .section-sub {
  font-size: 12px;
  color: var(--text-tertiary);
  font-weight: 400;
}

/* ═══════════ 站点卡片网格 ═══════════ */
.site-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 8px;
}
.site-card {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-size: 12.5px;
  color: var(--text-secondary);
  transition: var(--transition);
  overflow: hidden;
}
.site-card:hover {
  background: var(--primary-light);
  border-color: var(--border);
  color: var(--primary);
  transform: translateY(-1px);
}
.site-favicon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  border-radius: 3px;
  object-fit: contain;
}
.site-favicon-fb {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  border-radius: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 9px;
  font-weight: 700;
  color: #fff;
}
.site-name {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

/* ═══════════ 页脚 ═══════════ */
.site-footer {
  background: var(--card-bg);
  border-top: 1px solid var(--border);
  padding: 20px;
  text-align: center;
  font-size: 12px;
  color: var(--text-tertiary);
}
.footer-links { margin-bottom: 8px; }
.footer-links a { color: var(--text-secondary); margin: 0 6px; }
.footer-links a:hover { color: var(--primary); }

/* ═══════════ 响应式 ═══════════ */
@media (max-width: 900px) {
  .header-inner { flex-direction: column; gap: 14px; align-items: stretch; }
  .logo { justify-content: center; }
  .site-grid { grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); }
  .cat-nav-wrap { max-height: 130px; }   /* 窄屏两行大概更高 */
}
@media (max-width: 600px) {
  .main-content { padding: 0 12px; }
  .site-section { padding: 14px 16px; }
  .site-grid { grid-template-columns: repeat(auto-fill, minmax(100px, 1fr)); gap: 4px; }
  .cat-nav-item { padding: 9px 14px; font-size: 12.5px; }
  .logo-text { font-size: 20px; }
  .cat-nav-wrap { max-height: 100px; }
}
/* ═══════════ 回到顶部 ═══════════ */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--card-bg);
  color: var(--primary);
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.25s ease, transform 0.25s ease,
              background 0.2s, color 0.2s, border-color 0.2s, visibility 0.25s;
  z-index: 999;
}
.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  border-color: transparent;
  box-shadow: 0 6px 20px rgba(59,130,246,0.35);
}
.back-to-top:active {
  transform: translateY(1px);
}
.back-to-top svg {
  display: block;
}

/* 深色模式下阴影略淡一点，避免突兀 */
[data-theme="dark"] .back-to-top {
  box-shadow: 0 4px 16px rgba(0,0,0,0.5);
}

/* 窄屏缩小一点 + 贴近边缘 */
@media (max-width: 600px) {
  .back-to-top {
    right: 14px;
    bottom: 14px;
    width: 40px;
    height: 40px;
  }
}

/* ═══════════ 通用弹窗（收藏 / 设首页引导） ═══════════ */
.gorta-modal-mask {
  position: fixed;
  inset: 0;
  background: rgba(15,23,42,0.55);
  backdrop-filter: blur(3px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s, visibility 0.2s;
  padding: 20px;
}
.gorta-modal-mask.show {
  opacity: 1;
  visibility: visible;
}
.gorta-modal {
  background: var(--card-bg);
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: 0 20px 60px rgba(0,0,0,0.25);
  max-width: 460px;
  width: 100%;
  padding: 24px 26px 20px;
  transform: translateY(12px) scale(0.98);
  transition: transform 0.25s;
  position: relative;
}
.gorta-modal-mask.show .gorta-modal {
  transform: translateY(0) scale(1);
}
.gorta-modal-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.gorta-modal-title .gm-icon {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-size: 14px;
}
.gorta-modal-body {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.85;
}
.gorta-modal-body p { margin-bottom: 8px; }
.gorta-modal-body kbd {
  display: inline-block;
  padding: 1px 7px;
  background: var(--card-hover);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 4px;
  font-family: ui-monospace, "SF Mono", Consolas, monospace;
  font-size: 12px;
  color: var(--text);
  font-weight: 600;
}
.gorta-modal-body ol {
  padding-left: 20px;
  margin: 6px 0 8px;
}
.gorta-modal-body li { margin-bottom: 4px; }
.gorta-modal-close {
  margin-top: 16px;
  width: 100%;
  padding: 9px 0;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  transition: filter 0.2s;
}
.gorta-modal-close:hover { filter: brightness(1.1); }
.gorta-modal-x {
  position: absolute;
  top: 12px;
  right: 14px;
  background: none;
  border: none;
  color: var(--text-tertiary);
  font-size: 18px;
  cursor: pointer;
  line-height: 1;
  padding: 4px;
  border-radius: 6px;
  transition: var(--transition);
}
.gorta-modal-x:hover { background: var(--card-hover); color: var(--text); }