:root {
  --bg: #f7f7f9;
  --card-bg: #ffffff;
  --text: #1a1a1a;
  --text-secondary: #6b7280;
  --border: #e5e7eb;
  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --danger: #ef4444;
  --radius: 12px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 960px; margin: 0 auto; padding: 0 20px;
  display: flex; align-items: center; justify-content: space-between;
  height: 60px;
}
.nav-brand {
  font-weight: 700; font-size: 18px; color: var(--text); text-decoration: none;
}
.nav-links { display: flex; gap: 8px; }
.nav-links a {
  color: var(--text-secondary); text-decoration: none;
  padding: 8px 12px; border-radius: 8px; font-size: 15px;
  transition: background 0.15s, color 0.15s;
}
.nav-links a:hover, .nav-links a.active {
  background: #eef2ff; color: var(--accent);
}

.container { max-width: 960px; margin: 0 auto; padding: 32px 20px 64px; }

/* Hero */
.hero { text-align: center; padding: 40px 0 48px; }
.hero h1 { font-size: 32px; margin-bottom: 12px; }
.hero p { color: var(--text-secondary); font-size: 17px; max-width: 560px; margin: 0 auto; }

/* 文章列表卡片 */
.article-list { display: flex; flex-direction: column; gap: 16px; }
.article-card {
  display: block;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  text-decoration: none;
  color: inherit;
  transition: transform 0.15s, box-shadow 0.15s;
}
.article-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}
.article-card h2 { font-size: 19px; margin-bottom: 8px; color: var(--text); }
.article-card .excerpt {
  color: var(--text-secondary); font-size: 15px; margin-bottom: 12px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-meta {
  display: flex; gap: 12px; align-items: center;
  font-size: 13px; color: var(--text-secondary); flex-wrap: wrap;
}

.badge {
  display: inline-block; padding: 2px 10px; border-radius: 999px;
  font-size: 12px; background: #eef2ff; color: var(--accent);
}
.badge.pinned { background: #fef3c7; color: #b45309; }
.badge.draft { background: #f3f4f6; color: #6b7280; }

/* 工具栏 & 分类 */
.toolbar { display: flex; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.search-input {
  flex: 1; min-width: 200px;
  padding: 10px 14px;
  border: 1px solid var(--border); border-radius: 10px;
  font-size: 15px; outline: none; transition: border-color 0.15s;
  background: var(--card-bg);
}
.search-input:focus { border-color: var(--accent); }

.category-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 24px; }
.category-tabs button {
  padding: 6px 14px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  border-radius: 999px;
  font-size: 14px; cursor: pointer; color: var(--text-secondary);
  transition: all 0.15s;
}
.category-tabs button:hover { border-color: var(--accent); color: var(--accent); }
.category-tabs button.active {
  background: var(--accent); border-color: var(--accent); color: white;
}

/* 文章详情 */
.article-detail {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}
.article-detail h1 { font-size: 28px; margin-bottom: 16px; }
.article-detail .article-meta {
  margin-bottom: 24px; padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}
.article-body { font-size: 16px; line-height: 1.8; }
.article-body h1 { font-size: 24px; margin: 24px 0 12px; }
.article-body h2 { font-size: 21px; margin: 24px 0 12px; }
.article-body h3 { font-size: 18px; margin: 20px 0 10px; }
.article-body p { margin-bottom: 16px; }
.article-body img { max-width: 100%; border-radius: 8px; margin: 16px 0; }
.article-body blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 16px; color: var(--text-secondary); margin: 16px 0;
}
.article-body ul, .article-body ol { padding-left: 24px; margin-bottom: 16px; }
.article-body a { color: var(--accent); }

.empty { text-align: center; padding: 48px 20px; color: var(--text-secondary); }

/* 表单 */
.form-group { margin-bottom: 16px; }
.form-group label {
  display: block; font-size: 14px; font-weight: 500;
  margin-bottom: 6px; color: var(--text);
}
input[type="email"], input[type="password"], input[type="text"],
textarea, select {
  width: 100%; padding: 10px 14px;
  border: 1px solid var(--border); border-radius: 10px;
  font-size: 15px; font-family: inherit; outline: none;
  transition: border-color 0.15s;
  background: var(--card-bg);
}
input:focus, textarea:focus, select:focus { border-color: var(--accent); }
textarea { resize: vertical; min-height: 100px; }

button {
  font-family: inherit; cursor: pointer; border: none;
  border-radius: 10px; font-size: 15px; transition: all 0.15s;
}
.btn { padding: 10px 20px; background: var(--accent); color: white; }
.btn:hover { background: var(--accent-hover); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-secondary {
  padding: 10px 20px; background: var(--card-bg);
  border: 1px solid var(--border); color: var(--text);
}
.btn-secondary:hover { background: #f3f4f6; }
.btn-danger { padding: 10px 20px; background: var(--danger); color: white; }
.btn-danger:hover { background: #dc2626; }
.btn-small { padding: 6px 12px; font-size: 14px; }

/* Admin */
.admin-header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 24px; flex-wrap: wrap; gap: 12px;
}
.admin-article-item {
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 18px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 10px; gap: 12px; flex-wrap: wrap;
}
.admin-article-item .item-info { flex: 1; min-width: 200px; }
.admin-article-item .item-actions { display: flex; gap: 6px; flex-wrap: wrap; }

.editor-panel {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px; margin-top: 24px;
}
#editor {
  min-height: 300px; margin-bottom: 16px;
  background: white; border-radius: 8px;
}
.ql-toolbar { border-radius: 8px 8px 0 0; }
.ql-container {
  border-radius: 0 0 8px 8px;
  font-size: 15px; font-family: inherit;
}

.error-text { font-size: 14px; margin-top: 8px; }

footer {
  text-align: center; padding: 32px 20px;
  color: var(--text-secondary); font-size: 14px;
}

@media (max-width: 640px) {
  .hero h1 { font-size: 26px; }
  .article-detail { padding: 20px; }
  .article-detail h1 { font-size: 22px; }
  .container { padding: 24px 16px 48px; }
  .nav-links a { padding: 8px 10px; font-size: 14px; }
  .admin-article-item .item-actions button { flex: 1; }
}