:root {
  --bg: #f7f7f8;
  --fg: #1a1a1a;
  --muted: #6b7280;
  --border: #e5e7eb;
  --card: #ffffff;
  --accent: #2563eb;
  --accent-fg: #ffffff;
  --danger: #dc2626;
  --success: #16a34a;
  --radius: 10px;
  --max-w: 760px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111113;
    --fg: #e5e7eb;
    --muted: #9ca3af;
    --border: #27272a;
    --card: #1a1a1d;
    --accent: #3b82f6;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* 顶栏 */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(8px);
}
.topbar-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 20px;
  height: 56px;
  padding: 0 16px;
}
.brand {
  font-weight: 700;
  color: var(--fg);
  white-space: nowrap;
}
.brand:hover { text-decoration: none; }
.nav { display: flex; gap: 4px; flex: 1; }
.nav a {
  color: var(--muted);
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 14px;
}
.nav a:hover { text-decoration: none; background: color-mix(in srgb, var(--muted) 12%, transparent); color: var(--fg); }
.nav a.active { background: color-mix(in srgb, var(--accent) 12%, transparent); color: var(--accent); font-weight: 600; }

/* 容器 */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 24px 16px 48px;
}
.page-title { font-size: 20px; margin: 0 0 4px; }
.muted { color: var(--muted); font-size: 14px; }
.error { color: var(--danger); font-size: 14px; }
.success { color: var(--success); font-size: 14px; }

/* 表单元素 */
input[type="text"], input[type="password"], textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  color: var(--fg);
  font-size: 15px;
  font-family: inherit;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
input:focus, textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent); }
textarea { resize: vertical; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 13px; }

button {
  padding: 10px 16px;
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  background: var(--accent);
  color: var(--accent-fg);
  font-size: 15px;
  font-family: inherit;
  cursor: pointer;
  white-space: nowrap;
  transition: opacity .15s;
}
button:hover { opacity: .88; }
button:disabled { opacity: .5; cursor: not-allowed; }
button.ghost { background: transparent; color: var(--fg); border-color: var(--border); }
button.ghost:hover { opacity: 1; background: color-mix(in srgb, var(--muted) 12%, transparent); }

/* 卡片 */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
}
.card h2 { font-size: 16px; margin: 0 0 8px; }

/* 搜索 */
.search-form { display: flex; gap: 10px; margin-bottom: 20px; }
.search-form input { flex: 1; }
.result-card { display: block; color: var(--fg); }
.result-card:hover { border-color: var(--accent); text-decoration: none; }
.result-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.result-head h3 { font-size: 16px; margin: 0; line-height: 1.4; }
.result-excerpt {
  margin: 8px 0 0;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
}
.result-meta { display: flex; gap: 16px; margin-top: 10px; font-size: 13px; color: var(--muted); }

/* 徽标 */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 12px;
  line-height: 1.5;
  white-space: nowrap;
  border: 1px solid var(--border);
  color: var(--muted);
}
.badge-article { background: color-mix(in srgb, var(--accent) 12%, transparent); color: var(--accent); border-color: transparent; }
.badge-answer { background: color-mix(in srgb, #0891b2 12%, transparent); color: #0891b2; border-color: transparent; }
.badge-method { background: color-mix(in srgb, var(--muted) 14%, transparent); color: var(--fg); font-family: ui-monospace, monospace; }

/* 详情页 */
.back { display: inline-block; margin-bottom: 16px; font-size: 14px; color: var(--muted); }
.back:hover { color: var(--accent); }
.detail-title { font-size: 22px; line-height: 1.4; margin: 0 0 8px; }
.content-text {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 15px;
  line-height: 1.8;
}

/* 接口测试 */
.test-card .test-head { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; flex-wrap: wrap; }
.test-card code { font-size: 12px; color: var(--muted); font-family: ui-monospace, monospace; }
.test-card .test-title { margin-left: auto; font-size: 14px; font-weight: 600; }
.test-row { display: flex; gap: 10px; }
.test-row input { flex: 1; }
.test-output {
  margin: 12px 0 0;
  max-height: 320px;
  overflow: auto;
  background: color-mix(in srgb, var(--muted) 10%, transparent);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  font-size: 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-all;
}

/* 设置 */
.settings-section { margin-bottom: 20px; }
.settings-section h2 { margin: 0 0 8px; }
.settings-section .test-row { margin-bottom: 8px; }
.settings-section textarea { margin-bottom: 10px; }

@media (max-width: 560px) {
  .search-form, .test-row { flex-direction: column; }
  .nav a { padding: 6px 8px; }
  .topbar-inner { gap: 10px; }
}