/* ============================================================
   导航站前台样式
   设计语言：浅色清爽 / 深色静谧，靛蓝主色，卡片式布局
   ============================================================ */

:root {
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  --primary: #5b7cfa;
  --primary-2: #8b5cf6;
  --accent: #f59e0b;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow-card: 0 1px 2px rgba(20, 30, 70, .05), 0 4px 16px rgba(20, 30, 70, .05);
  --shadow-card-hover: 0 4px 10px rgba(20, 30, 70, .07), 0 14px 34px rgba(20, 30, 70, .1);
  --transition: .22s cubic-bezier(.25, .6, .3, 1);
}

[data-theme="light"] {
  --bg: #f5f6fa;
  --bg-soft: #eceef5;
  --card: #ffffff;
  --card-hover: #ffffff;
  --text: #1d2333;
  --text-2: #5d6575;
  --text-3: #98a0b3;
  --border: #e4e8f1;
  --border-strong: #d5dae8;
  --chip-bg: #ffffff;
  --chip-active: linear-gradient(135deg, #5b7cfa, #7c5cfa);
  --chip-active-text: #fff;
  --hero-bg: radial-gradient(1200px 520px at 50% -10%, rgba(91, 124, 250, .14), transparent 60%), radial-gradient(900px 400px at 85% 10%, rgba(139, 92, 246, .1), transparent 55%);
  --hot-bg: #fff7ed;
  --hot-border: #fde3c2;
  --hot-text: #b45309;
  --empty-bg: #fff;
}

[data-theme="dark"] {
  --bg: #0e1117;
  --bg-soft: #141922;
  --card: #171d29;
  --card-hover: #1b2231;
  --text: #e7ebf4;
  --text-2: #a4aec4;
  --text-3: #67718a;
  --border: #252d3e;
  --border-strong: #313b52;
  --chip-bg: #171d29;
  --chip-active: linear-gradient(135deg, #5b7cfa, #8b5cf6);
  --chip-active-text: #fff;
  --hero-bg: radial-gradient(1200px 520px at 50% -10%, rgba(91, 124, 250, .22), transparent 60%), radial-gradient(900px 400px at 85% 10%, rgba(139, 92, 246, .16), transparent 55%);
  --hot-bg: #1c150a;
  --hot-border: #3a2c10;
  --hot-text: #f0b256;
  --empty-bg: #171d29;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color .3s ease, color .3s ease;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; }

/* ==================== 顶栏 ==================== */

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.topbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; }
.brand-mark {
  width: 22px; height: 22px; border-radius: 7px;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  box-shadow: 0 3px 10px rgba(91, 124, 250, .35);
  position: relative;
}
.brand-mark::after {
  content: ""; position: absolute; inset: 6px; border-radius: 3px;
  background: rgba(255, 255, 255, .85);
  clip-path: polygon(0 100%, 0 0, 100% 0);
}

.topbar-actions { display: flex; align-items: center; gap: 10px; }

.icon-btn {
  width: 36px; height: 36px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--chip-bg);
  color: var(--text-2); cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  transition: var(--transition);
}
.icon-btn:hover { color: var(--primary); border-color: var(--primary); transform: translateY(-1px); }

[data-theme="light"] .icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }

.admin-link {
  font-size: 13px; color: var(--text-2); padding: 7px 14px;
  border: 1px solid var(--border); border-radius: 10px; background: var(--chip-bg);
  transition: var(--transition);
}
.admin-link:hover { color: var(--primary); border-color: var(--primary); }

/* ==================== Hero ==================== */

.hero {
  background: var(--hero-bg);
  border-bottom: 1px solid var(--border);
  padding: 56px 20px 40px;
}

.hero-inner { max-width: 720px; margin: 0 auto; text-align: center; }

.hero-title {
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 800;
  letter-spacing: -.5px;
  background: linear-gradient(120deg, var(--primary), var(--primary-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.hero-slogan { margin-top: 8px; color: var(--text-2); font-size: 15px; }

/* 搜索框 */
.search-box {
  position: relative;
  max-width: 560px;
  margin: 26px auto 0;
}
.search-icon {
  position: absolute; left: 18px; top: 50%; transform: translateY(-50%);
  color: var(--text-3); pointer-events: none;
}
.search-box input {
  width: 100%;
  padding: 14px 18px 14px 48px;
  border-radius: 999px;
  border: 1.5px solid var(--border-strong);
  background: var(--card);
  color: var(--text);
  font-size: 15px;
  outline: none;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
}
.search-box input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--primary) 18%, transparent);
}
.search-box input::placeholder { color: var(--text-3); }

.tag-pill {
  position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
  display: inline-flex; align-items: center; gap: 6px;
  background: color-mix(in srgb, var(--primary) 14%, transparent);
  color: var(--primary);
  font-size: 13px; font-weight: 600;
  padding: 5px 6px 5px 12px; border-radius: 999px;
}
.tag-pill button {
  border: none; background: none; color: inherit; cursor: pointer;
  width: 20px; height: 20px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 15px; line-height: 1;
}
.tag-pill button:hover { background: rgba(0, 0, 0, .1); }

/* 标签云 */
.tag-cloud { margin-top: 18px; display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
.tag-chip {
  border: 1px solid var(--border);
  background: var(--chip-bg);
  color: var(--text-2);
  font-size: 13px;
  padding: 5px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: var(--transition);
}
.tag-chip:hover {
  color: var(--primary); border-color: var(--primary);
  transform: translateY(-1px);
}
.tag-chip.is-active { color: #fff; border-color: transparent; background: var(--chip-active); }

/* ==================== 分类导航 ==================== */

.cat-nav {
  position: sticky;
  top: 58px;
  z-index: 40;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 14px 20px;
  max-width: 1200px;
  margin: 0 auto;
  scrollbar-width: none;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.cat-nav::-webkit-scrollbar { display: none; }

.cat-chip {
  flex: none;
  border: 1px solid var(--border);
  background: var(--chip-bg);
  color: var(--text-2);
  font-size: 14px;
  padding: 8px 18px;
  border-radius: 999px;
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition);
}
.cat-chip:hover { color: var(--primary); border-color: var(--primary); }
.cat-chip.is-active {
  color: var(--chip-active-text);
  border-color: transparent;
  background: var(--chip-active);
  box-shadow: 0 4px 14px rgba(91, 124, 250, .35);
}

/* ==================== 内容区 ==================== */

.container { max-width: 1200px; margin: 0 auto; padding: 10px 20px 60px; }

.result-line { font-size: 13px; color: var(--text-3); padding: 10px 2px 0; min-height: 24px; }

/* 热门推荐 */
.hot-bar {
  display: flex; align-items: flex-start; gap: 14px; flex-wrap: wrap;
  background: var(--hot-bg);
  border: 1px solid var(--hot-border);
  border-radius: var(--radius-md);
  padding: 12px 18px;
  margin: 14px 0 8px;
}
.hot-label { font-size: 13px; font-weight: 700; color: var(--hot-text); padding-top: 4px; flex: none; }
.hot-list { display: flex; flex-wrap: wrap; gap: 6px 12px; }
.hot-item {
  font-size: 14px; color: var(--text-2);
  padding: 4px 10px; border-radius: 8px;
  transition: var(--transition);
}
.hot-item:hover { color: var(--hot-text); background: color-mix(in srgb, var(--hot-text) 8%, transparent); }

/* 分类区块 */
.cat-section { margin-top: 34px; scroll-margin-top: 130px; }
.cat-title {
  display: flex; align-items: center; gap: 10px;
  font-size: 19px; font-weight: 700; letter-spacing: -.2px;
  margin-bottom: 16px;
}
.cat-ico { font-size: 22px; }
.cat-count {
  font-size: 12px; font-weight: 600; color: var(--text-3);
  background: var(--bg-soft); border-radius: 999px; padding: 2px 10px;
}

/* 卡片网格 */
.card-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.card {
  position: relative;
  display: flex; gap: 12px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
  overflow: hidden;
}
.card:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--primary) 45%, var(--border));
  box-shadow: var(--shadow-card-hover);
  background: var(--card-hover);
}
.card::before {
  content: "";
  position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: linear-gradient(180deg, var(--primary), var(--primary-2));
  opacity: 0; transition: var(--transition);
}
.card:hover::before { opacity: 1; }

.card-icon {
  flex: none;
  width: 44px; height: 44px;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 24px;
  background: var(--bg-soft);
  border-radius: 10px;
}

.card-body { min-width: 0; flex: 1; display: flex; flex-direction: column; gap: 4px; }

.card-title {
  font-size: 15px; font-weight: 600;
  display: flex; align-items: center; gap: 6px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.hot-badge {
  flex: none;
  font-style: normal; font-size: 10px; font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, #f97316, #ef4444);
  border-radius: 5px; padding: 1px 5px;
}

.card-desc {
  font-size: 13px; color: var(--text-2);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 1.5em;
}

.card-tags { display: flex; flex-wrap: wrap; gap: 5px; }
.card-tags i {
  font-style: normal; font-size: 11px; color: var(--text-3);
  background: var(--bg-soft); border-radius: 5px; padding: 1px 7px;
}

.card-arrow {
  flex: none; align-self: center;
  width: 26px; height: 26px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  color: var(--text-3); background: var(--bg-soft);
  opacity: 0; transform: translateX(-4px);
  transition: var(--transition);
}
.card:hover .card-arrow { opacity: 1; transform: translateX(0); color: var(--primary); }

/* 空状态 */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  background: var(--empty-bg);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-lg);
  margin-top: 30px;
}
.empty-icon { font-size: 42px; margin-bottom: 10px; }
.empty-state p { color: var(--text-2); font-size: 15px; margin-bottom: 16px; }
.empty-reset {
  border: 1px solid var(--border-strong); background: var(--chip-bg);
  color: var(--primary); font-size: 14px; font-weight: 600;
  padding: 9px 22px; border-radius: 999px; cursor: pointer;
  transition: var(--transition);
}
.empty-reset:hover { border-color: var(--primary); }

/* 页脚 */
.footer {
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 26px 20px;
  color: var(--text-3);
  font-size: 13px;
}

/* 隐藏辅助类 */
.hidden { display: none !important; }

/* 卡片入场动画（JS 添加 .in 类） */
.cat-section { opacity: 1; }

/* ==================== 响应式 ==================== */

@media (max-width: 1024px) {
  .card-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .hero { padding: 40px 16px 32px; }
}
@media (max-width: 480px) {
  .card-grid { grid-template-columns: 1fr; }
  .topbar-inner { height: 54px; }
  .cat-nav { top: 54px; }
}