/* ============ 基础 ============ */
:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --ink: #1e2433;
  --ink-2: #5a6378;
  --ink-3: #8b93a7;
  --line: #e5e8f0;
  --brand: #4338ca;
  --brand-2: #6d5ae6;
  --brand-soft: #eef0fe;
  --high: #15803d; --high-bg: #dcfce7; --high-line: #bbf7d0;
  --innov: #1d4ed8; --innov-bg: #dbeafe; --innov-line: #bfdbfe;
  --expe: #c2410c; --expe-bg: #ffedd5; --expe-line: #fed7aa;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(30,36,51,.05), 0 4px 16px rgba(30,36,51,.06);
  --shadow-lg: 0 8px 40px rgba(30,36,51,.18);
  --font: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
/* 关键：确保 hidden 属性始终生效，不被 display 样式覆盖（如弹窗遮罩） */
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body {
  margin: 0; font-family: var(--font); color: var(--ink); background: var(--bg);
  line-height: 1.6; -webkit-font-smoothing: antialiased;
  overflow-x: hidden;               /* 防止内容撑出横向滚动 */
}
img { max-width: 100%; }
.container { max-width: 1280px; margin: 0 auto; padding: 0 20px; min-width: 0; }
p, h1, h2, h3, a, span, div, pre { overflow-wrap: break-word; word-break: break-word; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
h1,h2,h3 { line-height: 1.3; }
.muted { color: var(--ink-3); font-size: .9em; }
.loading { color: var(--ink-3); padding: 24px 0; display: block; }
button { font-family: inherit; cursor: pointer; }

/* ============ 顶部导航 ============ */
.site-header {
  position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.9);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 62px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand-icon { font-size: 26px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text strong { font-size: 17px; }
.brand-text small { font-size: 11px; color: var(--ink-3); }
.header-nav { display: flex; gap: 18px; }
.nav-link { color: var(--ink-2); font-size: 14px; font-weight: 500; }
.nav-link:hover { color: var(--brand); text-decoration: none; }

/* ============ Hero ============ */
.hero {
  background: radial-gradient(1200px 500px at 20% -10%, #eef0fe 0%, rgba(238,240,254,0) 60%),
              radial-gradient(900px 420px at 90% -20%, #e0f2fe 0%, rgba(224,242,254,0) 55%),
              var(--bg);
  padding: 56px 0 40px; text-align: center;
}
.hero h1 { font-size: clamp(26px, 4.2vw, 44px); margin: 0 0 10px; letter-spacing: .5px; }
.hero h1 em { font-style: normal; color: var(--brand); }
.hero-sub { color: var(--ink-2); margin: 0 auto 26px; max-width: 720px; font-size: 15px; }
.hero-search {
  position: relative; max-width: 640px; margin: 0 auto;
  display: flex; align-items: center;
}
.hero-search input {
  width: 100%; padding: 14px 44px 14px 20px; font-size: 16px; border-radius: 999px;
  border: 1px solid var(--line); box-shadow: var(--shadow); outline: none;
  background: var(--surface); color: var(--ink); transition: border-color .15s, box-shadow .15s;
}
.hero-search input:focus { border-color: var(--brand-2); box-shadow: 0 0 0 4px rgba(109,90,230,.15); }
.hero-search .btn-ghost {
  position: absolute; right: 10px; border: none; background: var(--brand-soft);
  color: var(--ink-2); width: 30px; height: 30px; border-radius: 50%; font-size: 13px;
}
.hero-stats { margin-top: 18px; font-size: 14px; color: var(--ink-2); }
.hero-stats b { color: var(--brand); font-size: 16px; }
.hero-stats .sep { margin: 0 10px; color: var(--line); }
.tier-legend { margin-top: 14px; display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

/* ============ 三档标记 ============ */
.tier-chip {
  display: inline-flex; align-items: center; gap: 4px; padding: 3px 10px; border-radius: 999px;
  font-size: 12px; font-weight: 600; border: 1px solid;
  white-space: nowrap;              /* 标签强制单行，不折行 */
  flex-shrink: 0;
  line-height: 1.5;
}
.tier-high { color: var(--high); background: var(--high-bg); border-color: var(--high-line); }
.tier-innovative { color: var(--innov); background: var(--innov-bg); border-color: var(--innov-line); }
.tier-experimental { color: var(--expe); background: var(--expe-bg); border-color: var(--expe-line); }

/* ============ 分类导航 ============ */
.browse { padding: 26px 0 10px; }
.category-nav {
  display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 18px;
}
.cat-chip {
  border: 1px solid var(--line); background: var(--surface); color: var(--ink-2);
  padding: 7px 14px; border-radius: 999px; font-size: 13.5px; transition: all .15s;
  white-space: nowrap; flex-shrink: 0;
}
.cat-chip:hover { border-color: var(--brand-2); color: var(--brand); }
.cat-chip.active { background: var(--brand); border-color: var(--brand); color: #fff; }
.cat-chip .count { opacity: .7; font-size: 12px; margin-left: 4px; }
.cat-chip .count::before { content: "·"; margin-right: 2px; }

/* ============ 筛选栏 ============ */
.filter-bar { margin-bottom: 16px; }
.filters-row { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 10px; }
.filters-row select {
  padding: 8px 12px; border-radius: 10px; border: 1px solid var(--line); background: var(--surface);
  font-size: 13.5px; color: var(--ink); outline: none; min-width: 130px;
}
.tier-filters { display: flex; gap: 8px; flex-wrap: wrap; }
.tier-btn {
  border: 1px solid var(--line); background: var(--surface); color: var(--ink-2);
  padding: 6px 14px; border-radius: 999px; font-size: 13px; transition: all .15s;
}
.tier-btn.active { box-shadow: inset 0 0 0 1.5px currentColor; font-weight: 600; }
.tier-btn.tier-high.active { color: var(--high); background: var(--high-bg); border-color: var(--high-line); }
.tier-btn.tier-innovative.active { color: var(--innov); background: var(--innov-bg); border-color: var(--innov-line); }
.tier-btn.tier-experimental.active { color: var(--expe); background: var(--expe-bg); border-color: var(--expe-line); }
.result-meta { font-size: 13px; color: var(--ink-2); margin-bottom: 14px; }

/* ============ 卡片网格 ============ */
.card-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 16px;
  padding-bottom: 30px; min-width: 0;
}
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px 16px 14px; display: flex; flex-direction: column; gap: 10px;
  box-shadow: var(--shadow); transition: transform .15s, box-shadow .15s, border-color .15s;
  min-width: 0;
}
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); border-color: #d4d9ea; }
.card-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 8px; flex-wrap: nowrap; }
.card-title { font-size: 16px; font-weight: 650; margin: 0; line-height: 1.35; flex: 1 1 auto; min-width: 0; }
.card-title a {
  color: var(--ink); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.card-title a:hover { color: var(--brand); }
.badges { display: flex; gap: 6px; flex-wrap: wrap; min-width: 0; }
.badge {
  font-size: 11px; padding: 2px 8px; border-radius: 6px; font-weight: 600;
  background: var(--brand-soft); color: var(--brand); white-space: nowrap;
  max-width: 100%; overflow: hidden; text-overflow: ellipsis;
}
.badge.plat-openai-gpts { background:#e8f5e9; color:#2e7d32; }
.badge.plat-claude { background:#fdece8; color:#b3471e; }
.badge.plat-coze { background:#e3f2fd; color:#1565c0; }
.badge.plat-dify { background:#f3e5f5; color:#7b1fa2; }
.badge.plat-huggingface { background:#fff8e1; color:#b58a00; }
.badge.plat-langchain { background:#eceff1; color:#455a64; }
.badge.plat-github { background:#e8eaf6; color:#283593; }
.badge.plat-gitee { background:#fce8e6; color:#c62828; }
.badge.plat-poe { background:#fce4ec; color:#ad1457; }
.badge.plat-gemini { background:#e0f7fa; color:#006064; }
.badge.plat-other { background:#f5f5f5; color:#616161; }
.card-summary { font-size: 13.5px; color: var(--ink-2); margin: 0; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card-tags { display: flex; gap: 6px; flex-wrap: wrap; }
.tag { font-size: 11.5px; color: var(--ink-3); background: var(--bg); border-radius: 6px; padding: 2px 8px; }
.card-foot {
  margin-top: auto; display: flex; align-items: center; justify-content: space-between;
  gap: 8px; border-top: 1px dashed var(--line); padding-top: 10px;
}
.card-foot .who { font-size: 12px; color: var(--ink-3); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.card-actions { display: flex; gap: 6px; flex-shrink: 0; }
.btn {
  border: 1px solid var(--line); background: var(--surface); color: var(--ink-2);
  padding: 5px 12px; border-radius: 8px; font-size: 12.5px; transition: all .15s;
}
.btn:hover { border-color: var(--brand-2); color: var(--brand); }
.btn-primary {
  background: var(--brand); border-color: var(--brand); color: #fff;
  padding: 5px 14px; border-radius: 8px; font-size: 12.5px; transition: opacity .15s;
}
.btn-primary:hover { opacity: .88; color: #fff; text-decoration: none; }
.btn-copy { border-color: var(--innov-line); color: var(--innov); background: var(--innov-bg); }
.btn-copy:hover { border-color: var(--innov); }

/* ============ 空状态 ============ */
.empty-state { text-align: center; padding: 60px 0; color: var(--ink-2); }
.empty-state p { margin: 4px 0; }

/* ============ 捐赠 ============ */
.donate {
  background: linear-gradient(135deg, #fdf6e3 0%, #fff8e8 100%);
  border-top: 1px solid #f0e6c8; padding: 46px 0; text-align: center;
}
.donate h2 { margin-top: 0; }
.donate p { color: var(--ink-2); max-width: 640px; margin: 0 auto 20px; }
.donate-actions { display: flex; gap: 18px; justify-content: center; align-items: center; flex-wrap: wrap; }
.qr-card { width: 112px; text-align: center; cursor: zoom-in; }
.qr-card img {
  width: 112px; height: 112px; object-fit: contain; border-radius: 14px;
  background: #fff; padding: 10px; border: 1px solid #f0e6c8;
  box-shadow: var(--shadow); transition: transform .18s ease, box-shadow .18s ease;
}
.qr-card img:hover { transform: scale(1.06); box-shadow: var(--shadow-lg); }
.qr-card span { display: block; margin-top: 7px; font-size: 12.5px; color: var(--ink-2); letter-spacing: 1px; }
.donate .btn-primary { padding: 10px 26px; font-size: 15px; border-radius: 999px; }
.modal .qr-big { width: 100%; max-width: 340px; border-radius: 14px; display: block; margin: 14px auto; background: #fff; }

/* ============ 关于 ============ */
.about { padding: 46px 0; }
.about h2 { margin-top: 0; }
.about p { color: var(--ink-2); max-width: 800px; }
.about-meta { margin-top: 14px; font-size: 13px; }

/* ============ 页脚 ============ */
.site-footer { background: #171c2c; color: #aab0c4; padding: 30px 0 40px; font-size: 13px; }
.site-footer .muted { color: #6d7490; }
.site-footer a { color: #9aa3ff; }

/* ============ 弹窗 ============ */
.modal-backdrop {
  position: fixed; inset: 0; z-index: 100; background: rgba(15,18,32,.55);
  display: flex; align-items: center; justify-content: center; padding: 20px;
  backdrop-filter: blur(3px);
}
.modal {
  background: var(--surface); border-radius: 18px; max-width: 720px; width: 100%;
  max-height: 86vh; overflow-y: auto; padding: 26px 28px; position: relative;
  box-shadow: var(--shadow-lg);
}
.modal-close {
  position: absolute; top: 14px; right: 14px; width: 32px; height: 32px; border-radius: 50%;
  border: none; background: var(--bg); color: var(--ink-2); font-size: 15px;
}
.modal-close:hover { background: var(--line); }
.modal h2 { margin: 0 0 4px; padding-right: 30px; }
.modal .modal-meta { color: var(--ink-3); font-size: 12.5px; margin-bottom: 14px; }
.modal section { margin: 16px 0; }
.modal section h3 { font-size: 14px; margin: 0 0 6px; color: var(--ink-2); }
.modal .summary { color: var(--ink); font-size: 14.5px; margin: 0; }
.modal ul.features { margin: 4px 0; padding-left: 20px; color: var(--ink-2); font-size: 13.5px; }
.modal .links { display: flex; flex-direction: column; gap: 6px; font-size: 13.5px; word-break: break-all; }
.citation-block {
  background: #0f1220; color: #d8def0; border-radius: 10px; padding: 14px;
  font-family: "JetBrains Mono", Consolas, Menlo, monospace; font-size: 12.5px;
  white-space: pre-wrap; word-break: break-word; max-height: 320px; overflow-y: auto;
}
.citation-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.citation-head .citation-type { font-size: 12px; color: var(--ink-3); }
.modal .meta-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 8px; font-size: 12.5px; color: var(--ink-2); }
.modal .meta-grid b { color: var(--ink-3); font-weight: 500; display: block; font-size: 11.5px; }

/* ============ Toast ============ */
.toast {
  position: fixed; bottom: 26px; left: 50%; transform: translateX(-50%);
  background: #101426; color: #fff; padding: 10px 20px; border-radius: 999px;
  font-size: 13.5px; box-shadow: var(--shadow-lg); z-index: 200;
}

/* ============ 响应式 ============ */
@media (max-width: 720px) {
  .header-inner { height: 56px; }
  .header-nav { gap: 12px; }
  .nav-link { font-size: 13px; }
  .hero { padding: 38px 0 28px; }
  .hero h1 { font-size: 24px; }
  .hero-stats { line-height: 2.1; padding: 0 8px; }
  .hero-stats .sep { margin: 0 6px; }
  .card-grid { grid-template-columns: 1fr; }
  .card { width: 100%; }
  .filters-row select { flex: 1 1 45%; min-width: 0; }
  .category-nav { flex-wrap: nowrap; overflow-x: auto; -webkit-overflow-scrolling: touch; padding-bottom: 6px; scrollbar-width: none; }
  .category-nav::-webkit-scrollbar { display: none; }
  .modal { padding: 20px 18px; }
  .modal h2 { font-size: 18px; }
  .tier-legend { gap: 6px; }
  .tier-legend .tier-chip { font-size: 11px; padding: 2px 8px; }
  .citation-block { font-size: 11.5px; }
  .card-actions .btn { padding: 5px 9px; font-size: 11.5px; }
}