/* 全球医疗器械法规公益平台 —— 专业浅色主题 */
:root {
  --primary: #0d6e6e;      /* 医疗青 */
  --primary-dark: #0a5757;
  --primary-light: #e6f4f4;
  --accent: #1e6fd9;       /* 科技蓝 */
  --text: #1f2a37;
  --text-muted: #5b6b7b;
  --border: #e3e8ee;
  --bg: #f6f8fb;
  --bg-card: #ffffff;
  --danger: #d64545;
  --success: #2f9e5b;
  --radius: 12px;
  --shadow: 0 2px 12px rgba(16, 40, 60, 0.06);
  --shadow-hover: 0 8px 28px rgba(16, 40, 60, 0.12);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }

/* 顶部导航 */
.navbar {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
}
.navbar .container { display: flex; align-items: center; justify-content: space-between; height: 66px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand .logo {
  width: 38px; height: 38px; border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: grid; place-items: center; color: #fff; font-size: 20px;
}
.brand small { display:block; font-weight: 400; font-size: 11px; color: var(--text-muted); }
.nav-links { display: flex; align-items: center; gap: 8px; }
.nav-links a { padding: 8px 14px; border-radius: 8px; color: var(--text-muted); font-size: 15px; }
.nav-links a:hover { background: var(--primary-light); color: var(--primary-dark); text-decoration: none; }
.nav-links a.active { color: var(--primary-dark); font-weight: 600; }

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 9px 18px; border-radius: 8px; border: 1px solid transparent;
  font-size: 14px; font-weight: 600; cursor: pointer; transition: .15s; background: none;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); text-decoration: none; }
.btn-outline { border-color: var(--border); color: var(--text); background: #fff; }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-ghost { color: var(--text-muted); }
.btn-ghost:hover { background: var(--bg); }
.btn-danger { background: var(--danger); color:#fff; }
.btn-sm { padding: 5px 12px; font-size: 13px; }
.btn:disabled { opacity: .55; cursor: not-allowed; }

/* Hero */
.hero {
  background: linear-gradient(135deg, #0d6e6e 0%, #1e6fd9 100%);
  color: #fff; padding: 68px 0 60px;
}
.hero h1 { font-size: 38px; line-height: 1.25; margin-bottom: 16px; }
.hero p { font-size: 17px; opacity: .92; max-width: 720px; margin-bottom: 26px; }
.hero .actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero .btn-outline { background: rgba(255,255,255,.12); border-color: rgba(255,255,255,.4); color:#fff; }
.hero .btn-outline:hover { background: rgba(255,255,255,.22); }
.hero .btn-white { background:#fff; color: var(--primary-dark); }

/* 统计条 */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 38px; }
.stat-card { background: rgba(255,255,255,.14); border:1px solid rgba(255,255,255,.22); border-radius: var(--radius); padding: 18px; }
.stat-card .num { font-size: 30px; font-weight: 700; }
.stat-card .label { font-size: 13px; opacity: .9; }

/* 区块 */
.section { padding: 52px 0; }
.section-head { display:flex; align-items:flex-end; justify-content: space-between; margin-bottom: 26px; flex-wrap: wrap; gap: 10px; }
.section-head h2 { font-size: 26px; }
.section-head p { color: var(--text-muted); font-size: 15px; }

/* 特性卡 */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feature { background: var(--bg-card); border:1px solid var(--border); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow); transition:.18s; }
.feature:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); }
.feature .ico { width: 46px; height:46px; border-radius: 12px; background: var(--primary-light); color: var(--primary); display:grid; place-items:center; font-size: 22px; margin-bottom: 14px; }
.feature h3 { font-size: 18px; margin-bottom: 8px; }
.feature p { color: var(--text-muted); font-size: 14px; }

/* 卡片网格（法规/资源） */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 18px; }
.card { background: var(--bg-card); border:1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); transition:.15s; display:flex; flex-direction:column; }
.card:hover { box-shadow: var(--shadow-hover); }
.card .tags { display:flex; gap:8px; flex-wrap: wrap; margin-bottom: 12px; }
.tag { font-size: 12px; padding: 3px 10px; border-radius: 20px; background: var(--primary-light); color: var(--primary-dark); font-weight: 600; }
.tag.gray { background:#eef1f5; color: var(--text-muted); }
.tag.blue { background:#e7f0fc; color: var(--accent); }
.card h3 { font-size: 16px; margin-bottom: 8px; line-height: 1.45; }
.card .desc { color: var(--text-muted); font-size: 13px; flex:1; margin-bottom: 14px; }
.card .meta { display:flex; align-items:center; justify-content: space-between; font-size: 12px; color: var(--text-muted); border-top:1px solid var(--border); padding-top: 12px; }

/* 工具栏/筛选 */
.toolbar { display:flex; gap: 12px; flex-wrap: wrap; margin-bottom: 24px; align-items:center; }
.toolbar input[type=text], .toolbar select {
  padding: 9px 12px; border:1px solid var(--border); border-radius: 8px; font-size: 14px; background:#fff; color: var(--text);
}
.toolbar input[type=text] { flex: 1; min-width: 220px; }

/* 表单 */
.auth-wrap { max-width: 440px; margin: 56px auto; }
.auth-card { background: var(--bg-card); border:1px solid var(--border); border-radius: var(--radius); padding: 34px; box-shadow: var(--shadow); }
.auth-card h2 { font-size: 24px; margin-bottom: 6px; }
.auth-card .sub { color: var(--text-muted); font-size: 14px; margin-bottom: 24px; }
.form-group { margin-bottom: 16px; }
.form-group label { display:block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: var(--text); }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 11px 13px; border:1px solid var(--border); border-radius: 8px; font-size: 14px; background:#fff; color: var(--text); font-family: inherit;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus { outline:none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-light); }
.form-actions { margin-top: 22px; }
.form-actions .btn { width: 100%; }
.auth-switch { text-align:center; margin-top: 18px; font-size: 14px; color: var(--text-muted); }

/* 提示消息 */
.alert { padding: 11px 14px; border-radius: 8px; font-size: 14px; margin-bottom: 16px; display:none; }
.alert.show { display:block; }
.alert-error { background:#fdecec; color: var(--danger); border:1px solid #f6c9c9; }
.alert-success { background:#e9f7ef; color: var(--success); border:1px solid #bfe6cd; }

/* 上传区 */
.upload-box {
  border: 2px dashed var(--border); border-radius: var(--radius); padding: 34px; text-align:center;
  background: var(--bg-card); cursor: pointer; transition:.15s; margin-bottom: 18px;
}
.upload-box:hover, .upload-box.drag { border-color: var(--primary); background: var(--primary-light); }
.upload-box .ico { font-size: 40px; color: var(--primary); margin-bottom: 10px; }
.file-list { list-style:none; margin-top: 14px; }
.file-list li { display:flex; justify-content: space-between; align-items:center; padding: 8px 12px; background: var(--bg); border-radius: 8px; margin-bottom: 6px; font-size: 13px; }

/* 分页 */
.pagination { display:flex; justify-content:center; gap: 8px; margin-top: 30px; }
.pagination button { min-width: 38px; padding: 7px 10px; border:1px solid var(--border); background:#fff; border-radius: 8px; cursor:pointer; color: var(--text); }
.pagination button.active { background: var(--primary); color:#fff; border-color: var(--primary); }
.pagination button:disabled { opacity:.5; cursor:not-allowed; }

/* 页脚 */
.footer { background: #0c1a24; color: #c4d0da; padding: 40px 0 28px; margin-top: 40px; }
.footer .cols { display:grid; grid-template-columns: 2fr 1fr 1fr; gap: 30px; margin-bottom: 26px; }
.footer h4 { color:#fff; font-size: 15px; margin-bottom: 12px; }
.footer a { color:#9fb2c0; display:block; font-size: 14px; margin-bottom: 8px; }
.footer a:hover { color:#fff; }
.footer .copy { border-top:1px solid #1e3240; padding-top: 18px; font-size: 13px; color:#7f95a5; text-align:center; }

/* 页头 banner（子页面） */
.page-header { background: linear-gradient(135deg, #0d6e6e 0%, #1e6fd9 100%); color:#fff; padding: 40px 0; }
.page-header h1 { font-size: 30px; margin-bottom: 8px; }
.page-header p { opacity: .9; }

.empty { text-align:center; padding: 60px 0; color: var(--text-muted); }
.loading { text-align:center; padding: 40px; color: var(--text-muted); }

.user-chip { display:flex; align-items:center; gap:8px; font-size:14px; }
.user-chip .avatar { width:32px; height:32px; border-radius:50%; background: var(--primary); color:#fff; display:grid; place-items:center; font-weight:600; }

/* 响应式 */
@media (max-width: 860px) {
  .features, .stats { grid-template-columns: repeat(2, 1fr); }
  .footer .cols { grid-template-columns: 1fr; }
  .hero h1 { font-size: 28px; }
  .nav-links a { padding: 6px 8px; font-size: 14px; }
  .brand small { display:none; }
}
@media (max-width: 520px) {
  .stats { grid-template-columns: 1fr 1fr; }
  .features { grid-template-columns: 1fr; }
}