:root {
  --bg: #f4f7fb;
  --panel: #ffffff;
  --line: #d9e2f0;
  --line-strong: #c9d5e8;
  --text: #14213d;
  --muted: #6f7f9a;
  --primary: #0f1d44;
  --primary-soft: #edf3ff;
  --accent: #3c74ff;
  --success: #2fbf71;
  --warning: #f0b429;
  --danger: #e05d5d;
  --shadow: 0 14px 34px rgba(15, 29, 68, 0.05);
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 12px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  color: var(--text);
  background: var(--bg);
}

a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
.hidden { display: none !important; }

.app-shell { min-height: 100vh; }
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: center;
  padding: 20px 28px;
  background: rgba(244, 247, 251, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(201, 213, 232, 0.55);
}

.brand { display: flex; align-items: center; gap: 14px; }
.brand-mark {
  width: 42px; height: 42px; border-radius: 14px;
  display: grid; place-items: center;
  background: linear-gradient(180deg, #4d7dff, #2764ff);
  color: #fff; font-weight: 800; font-size: 24px;
  box-shadow: 0 8px 24px rgba(39, 100, 255, 0.2);
}
.brand-copy { display: flex; flex-direction: column; gap: 2px; }
.brand-copy strong { font-size: 18px; }
.brand-copy small { color: var(--muted); }
.topbar-actions { display: flex; align-items: center; gap: 12px; }
.icon-btn, .mini-btn, .ghost-btn {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--muted);
  border-radius: 16px;
  cursor: pointer;
}
.icon-btn {
  width: 44px; height: 44px; display: grid; place-items: center; font-size: 20px;
}
.mini-btn {
  width: 40px; height: 40px; display: grid; place-items: center;
}
.ghost-btn {
  padding: 10px 14px; font-weight: 600;
}
.searchbar {
  display: flex; align-items: center; gap: 10px;
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 18px; padding: 8px 8px 8px 14px; min-width: 460px;
}
.search-icon { color: var(--muted); }
.searchbar input {
  flex: 1; border: 0; outline: 0; background: transparent; color: var(--text);
}
.primary-btn {
  background: var(--primary); color: #fff; border: 0; cursor: pointer;
  border-radius: 14px; padding: 10px 16px; font-weight: 700;
}
.primary-btn.small { padding: 10px 14px; font-size: 14px; }

.main-layout {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  padding: 22px 26px 36px;
}
.content-area { min-width: 0; display: flex; flex-direction: column; gap: 18px; }
.panel {
  background: var(--panel);
  border: 1px solid rgba(201, 213, 232, 0.8);
  box-shadow: var(--shadow);
  border-radius: var(--radius-lg);
}
.hero {
  display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(280px, .9fr);
  gap: 28px; padding: 30px;
}
.hero-badge {
  display: inline-block; padding: 8px 12px; border-radius: 999px;
  background: var(--primary-soft); color: var(--accent); font-weight: 700; font-size: 14px;
}
.hero h1 {
  font-size: clamp(42px, 4vw, 70px);
  line-height: 1.02; margin: 18px 0 16px;
}
.hero p { color: var(--muted); font-size: 18px; line-height: 1.7; margin: 0; }
.hero-stats { display: flex; gap: 14px; margin-top: 28px; flex-wrap: wrap; }
.stat-card {
  min-width: 164px; padding: 20px; border-radius: 22px; border: 1px solid var(--line);
  background: linear-gradient(180deg, #fff, #fbfdff);
}
.stat-card strong { display: block; font-size: 48px; line-height: 1; margin-bottom: 10px; }
.stat-card span { color: var(--muted); font-weight: 600; }
.hero-right {
  display: grid; grid-template-columns: repeat(2, minmax(140px, 1fr)); gap: 12px; align-content: center;
}
.quick-cat {
  display: flex; align-items: center; gap: 10px; min-height: 58px; padding: 16px 18px;
  border-radius: 18px; border: 1px solid var(--line); background: #fff; font-weight: 700;
}
.quick-cat:hover { border-color: var(--line-strong); box-shadow: 0 10px 22px rgba(15,29,68,.06); }

.section-panel { padding: 24px; }
.section-head {
  display: flex; justify-content: space-between; gap: 16px; align-items: flex-start;
  margin-bottom: 18px;
}
.section-head h2 { margin: 0 0 8px; font-size: 24px; }
.section-head p { margin: 0; color: var(--muted); }
.meta-chip {
  white-space: nowrap; border: 1px solid var(--line); background: #f9fbff; color: var(--muted);
  border-radius: 999px; padding: 9px 14px; font-weight: 700;
}
.tool-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}
.tool-card {
  min-height: 272px;
  display: flex; flex-direction: column; gap: 14px;
  border-radius: 24px; border: 1px solid var(--line);
  padding: 18px; background: #fff;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.tool-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 30px rgba(15,29,68,.06);
  border-color: var(--line-strong);
}
.tool-head { display: flex; gap: 14px; align-items: flex-start; }
.tool-icon-wrap {
  width: 56px; height: 56px; border-radius: 18px; border: 1px solid var(--line);
  display: grid; place-items: center; background: #fff; overflow: hidden; flex: 0 0 auto;
}
.tool-icon { width: 32px; height: 32px; object-fit: contain; }
.tool-fallback { font-size: 28px; }
.tool-head-copy { min-width: 0; }
.tool-title { margin: 2px 0 6px; font-size: 18px; line-height: 1.2; }
.tool-sub {
  margin: 0; color: #8a98b0; font-size: 13px; font-weight: 700;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.tool-desc {
  margin: 0; color: #52627d; line-height: 1.7;
  display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 3; overflow: hidden;
  min-height: 82px;
}
.tool-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: auto; }
.tag {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 5px 9px; border-radius: 999px; font-size: 11px; font-weight: 700;
  border: 1px solid var(--line);
  background: #f6f9ff; color: var(--muted);
}
.tag.featured { background: rgba(47,191,113,.12); color: #17864a; border-color: rgba(47,191,113,.28); }
.tag.free { background: rgba(60,116,255,.1); color: #265ce3; border-color: rgba(60,116,255,.24); }
.tag.domestic { background: rgba(240,180,41,.14); color: #9c6b00; border-color: rgba(240,180,41,.3); }
.tag.recent { background: rgba(220, 94, 75, 0.1); color: #c24b37; border-color: rgba(220, 94, 75, 0.22); }
.tool-foot { display: flex; gap: 10px; justify-content: space-between; align-items: center; }
.domain-chip {
  max-width: 60%; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  border: 1px solid var(--line); background: #f7f9fd; color: #667899;
  border-radius: 999px; padding: 8px 12px; font-weight: 700; font-size: 12px;
}

.stack-list { display: flex; flex-direction: column; gap: 18px; }
.preview-block { border-top: 1px solid var(--line); padding-top: 18px; }
.preview-head { display: flex; justify-content: space-between; gap: 16px; align-items: flex-start; margin-bottom: 14px; }
.preview-head h3 { margin: 0 0 6px; font-size: 28px; display: flex; gap: 10px; align-items: center; }
.preview-head p { margin: 0; color: var(--muted); }
.link-btn {
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 999px; padding: 10px 14px; font-weight: 700;
  border: 1px solid var(--line); background: #fff;
}

.filter-bar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 18px; }
.filter-pill {
  border-radius: 999px; padding: 10px 14px; border: 1px solid var(--line);
  background: #fff; color: var(--muted); font-weight: 700; cursor: pointer;
}
.filter-pill.active { background: var(--primary); border-color: var(--primary); color: #fff; }
.result-summary { color: var(--muted); margin: 6px 0 18px; }
mark { background: #fff0a6; border-radius: 5px; padding: 0 3px; box-shadow: inset 0 -1px 0 rgba(255, 208, 0, 0.2); }
.empty-state {
  border: 1px dashed var(--line-strong); border-radius: 24px; padding: 42px; text-align: center; background: #fbfdff;
}
.empty-emoji { font-size: 36px; }
.empty-state h3 { margin: 12px 0 8px; }
.empty-state p { margin: 0; color: var(--muted); }
.empty-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; margin-top: 18px; }

.toolbar-row{display:flex;justify-content:space-between;gap:14px;align-items:center;flex-wrap:wrap;margin-bottom:18px}
.sort-wrap{display:flex;align-items:center;gap:10px;margin-left:auto}
.sort-wrap label{font-size:13px;font-weight:700;color:var(--muted)}
.sort-select{height:42px;border-radius:14px;border:1px solid var(--line);padding:0 14px;background:#fff;color:var(--text);font-weight:700;min-width:150px}
.result-summary{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.result-summary .summary-main{font-weight:700;color:var(--text)}
.result-summary .summary-sub{color:var(--muted);font-size:14px}
.tool-card .tool-title{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tool-card .tool-desc{-webkit-line-clamp:2;min-height:56px}
.tool-card .tool-tags{min-height:32px;align-items:flex-start}
.tool-foot{margin-top:auto}
.side-item .count-pill{font-size:11px;min-width:28px;padding:4px 8px}
.sidebar.collapsed .count-pill{display:none}
.empty-state .primary-btn,.empty-state .ghost-btn{display:inline-flex;align-items:center;justify-content:center}