:root {
  --primary: #4f6ef7;
  --primary-dark: #3b56d9;
  --primary-soft: #eef1ff;
  --accent: #06b6d4;
  --success: #16a34a;
  --success-soft: #e9f9ef;
  --warning: #d97706;
  --warning-soft: #fef6e7;
  --danger: #e5484d;
  --danger-soft: #fdeeee;
  --info-soft: #eef1ff;
  --text: #1e293b;
  --muted: #64748b;
  --border: #e6e9f0;
  --bg: #f5f7fb;
  --card: #ffffff;
  --radius: 16px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .05);
  --shadow: 0 6px 20px -8px rgba(15, 23, 42, .12);
  --shadow-lg: 0 16px 40px -16px rgba(15, 23, 42, .22);
  --sidebar: #0f172a;
  --sidebar-text: #cbd5e1;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(1200px 500px at 80% -10%, rgba(79, 110, 247, .10), transparent 60%),
    radial-gradient(900px 400px at 0% 0%, rgba(6, 182, 212, .10), transparent 55%),
    var(--bg);
  background-attachment: fixed;
  line-height: 1.6;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: none; }
.container { max-width: 1020px; margin: 0 auto; padding: 0 20px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.req { color: var(--danger); }
code { background: #f1f5f9; padding: 1px 6px; border-radius: 5px; font-size: 12.5px; }

/* ---------- 品牌 ---------- */
.brand { display: flex; align-items: center; gap: 10px; }
.brand.inline { text-decoration: none; color: var(--text); }
.brand-name { font-weight: 700; font-size: 18px; letter-spacing: .2px; }
.logo {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff; font-weight: 700; font-size: 18px; flex: none;
  box-shadow: 0 6px 16px -6px rgba(79, 110, 247, .6);
}

/* ---------- 前台头部/页脚 ---------- */
.site-header {
  background: rgba(255, 255, 255, .85);
  backdrop-filter: saturate(160%) blur(8px);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 50;
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.nav { display: flex; align-items: center; gap: 6px; }
.nav a {
  color: var(--text); font-weight: 500; padding: 8px 13px; border-radius: 9px;
  transition: .15s; font-size: 14.5px;
}
.nav a:hover { background: var(--primary-soft); color: var(--primary); }
.nav a.active { background: var(--primary-soft); color: var(--primary); font-weight: 600; }
.nav a.btn { margin-left: 6px; color: #fff; }
.site-footer { padding: 26px 0; text-align: center; margin-top: 48px; color: var(--muted); font-size: 13px; }

.hero { padding: 44px 0 6px; }
.hero h1 { margin: 0 0 8px; font-size: 32px; letter-spacing: -.5px; }
.hero p { margin: 0; }

/* ---------- 卡片 ---------- */
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow-sm);
  transition: .2s;
}
.card h3 { margin: 0 0 14px; font-size: 17px; }
.card:hover { box-shadow: var(--shadow); }
.info-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 18px; padding: 22px 0 44px; }
.info-grid .card h3 { margin-top: 0; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 10px 18px; border-radius: 10px;
  background: #fff; color: var(--text); border: 1px solid var(--border);
  font-size: 14px; font-weight: 500; cursor: pointer; text-decoration: none; text-align: center;
  transition: .15s;
}
.btn:hover { background: #f8fafc; border-color: #d7dce5; transform: translateY(-1px); }
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-color: transparent; color: #fff;
  box-shadow: 0 8px 18px -8px rgba(79, 110, 247, .7);
}
.btn-primary:hover { filter: brightness(1.05); background: linear-gradient(135deg, var(--primary), var(--primary-dark)); }
.btn-block { display: flex; width: 100%; }
.btn-sm { padding: 7px 13px; font-size: 13px; border-radius: 8px; }
.btn-group { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

/* ---------- 表单 ---------- */
.form-item { margin-bottom: 16px; }
.form-item label { display: block; margin-bottom: 7px; font-weight: 600; font-size: 13.5px; color: #334155; }
.form-item input[type="text"], .form-item input[type="password"],
.form-item input[type="email"], .form-item input[type="number"],
.form-item select, .form-item textarea {
  width: 100%; padding: 11px 13px; border: 1px solid var(--border);
  border-radius: 10px; font-size: 14px; background: #fbfcfe; color: var(--text);
  transition: .15s; font-family: inherit;
}
.form-item textarea { resize: vertical; min-height: 80px; }
.form-item input:focus, .form-item select:focus, .form-item textarea:focus {
  outline: none; border-color: var(--primary); background: #fff;
  box-shadow: 0 0 0 4px rgba(79, 110, 247, .12);
}
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 0 16px; }

.switch-item { display: flex; align-items: center; gap: 14px; padding: 12px 14px; background: #f8fafc; border: 1px solid var(--border); border-radius: 12px; }
.switch-item label:first-child { margin: 0; }
.switch { position: relative; display: inline-block; width: 48px; height: 27px; flex: none; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider {
  position: absolute; cursor: pointer; inset: 0; background: #cbd5e1;
  border-radius: 27px; transition: .2s;
}
.slider::before {
  content: ""; position: absolute; height: 21px; width: 21px; left: 3px; top: 3px;
  background: #fff; border-radius: 50%; transition: .2s;
  box-shadow: 0 1px 3px rgba(0,0,0,.25);
}
.switch input:checked + .slider { background: linear-gradient(135deg, var(--primary), var(--accent)); }
.switch input:checked + .slider::before { transform: translateX(21px); }

/* ---------- 提示 ---------- */
.notice { padding: 12px 16px; border-radius: 10px; margin-bottom: 16px; font-size: 14px; border: 1px solid transparent; }
.notice ul { margin: 6px 0 0; padding-left: 20px; }
.notice.small { font-size: 13px; padding: 11px 14px; line-height: 1.8; }
.notice-success { background: var(--success-soft); border-color: #b9e8cb; color: #15803d; }
.notice-error { background: var(--danger-soft); border-color: #f5c2c4; color: #c0363c; }
.notice-warning { background: var(--warning-soft); border-color: #f5dfa6; color: #b45309; }
.notice-info { background: var(--info-soft); border-color: #d3dcfc; color: var(--primary); }

/* ---------- 徽章 ---------- */
.badge { display: inline-flex; align-items: center; gap: 5px; padding: 3px 11px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.badge::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.badge-ok { background: var(--success-soft); color: var(--success); }
.badge-off { background: #f1f5f9; color: var(--muted); }
.badge-warn { background: var(--warning-soft); color: var(--warning); }

/* ---------- 认证页 ---------- */
.auth-body {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  padding: 30px 16px;
  background: linear-gradient(160deg, #eef2ff, #e0f7fa);
}
.auth-card {
  width: 100%; max-width: 420px; background: var(--card);
  border-radius: 18px; padding: 34px; box-shadow: var(--shadow-lg);
}
.auth-card.wide { max-width: 760px; }
.auth-card .brand { flex-direction: column; text-align: center; margin-bottom: 22px; }
.auth-card .brand h1 { font-size: 24px; margin: 8px 0 2px; }
.auth-foot { display: flex; justify-content: space-between; margin-top: 18px; font-size: 14px; }
fieldset { border: 1px solid var(--border); border-radius: 12px; padding: 16px; margin-bottom: 18px; }
legend { font-weight: 700; padding: 0 8px; color: var(--primary); }

/* ---------- 头像/资料 ---------- */
.avatar { width: 64px; height: 64px; border-radius: 50%; object-fit: cover; border: 3px solid #fff; box-shadow: var(--shadow); }
.avatar.lg { width: 96px; height: 96px; }
.avatar-letter {
  display: inline-flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff; font-size: 34px; font-weight: 700;
}
.profile-bar { display: flex; align-items: center; gap: 16px; margin-top: 18px; flex-wrap: wrap; }
.profile-bar .btn { margin-left: auto; }
.profile-card { text-align: center; padding: 30px; }
.profile-card h2 { margin: 12px 0 2px; }
.profile-meta { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; margin: 20px 0; text-align: center; }
.profile-meta div { background: var(--bg); border-radius: 12px; padding: 12px; }
.profile-meta span, .profile-meta b { display: block; }
.profile-meta span { font-size: 12px; color: var(--muted); }

/* ---------- 后台布局 ---------- */
.admin-body { display: flex; min-height: 100vh; }
.sidebar {
  width: 230px; background: var(--sidebar); color: var(--sidebar-text);
  display: flex; flex-direction: column; flex: none;
}
.side-brand { display: flex; align-items: center; gap: 10px; padding: 20px; color: #fff; }
.side-nav { padding: 6px 12px; display: flex; flex-direction: column; gap: 4px; flex: 1; }
.side-nav a {
  padding: 11px 14px; border-radius: 9px; color: var(--sidebar-text);
  font-weight: 500; transition: .15s;
}
.side-nav a:hover { background: rgba(255, 255, 255, .08); color: #fff; }
.side-nav a.active { background: linear-gradient(135deg, var(--primary), var(--primary-dark)); color: #fff; }
.side-foot { padding: 16px; }
.admin-main { flex: 1; min-width: 0; }
.admin-topbar {
  display: flex; align-items: center; justify-content: space-between;
  background: var(--card); border-bottom: 1px solid var(--border);
  padding: 16px 26px; flex-wrap: wrap; gap: 8px;
}
.admin-topbar h1 { font-size: 20px; margin: 0; }
.admin-content { padding: 24px 26px 40px; display: grid; gap: 20px; }

/* ---------- 统计卡片 / 表格 ---------- */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px; }
.stat-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; text-align: center; box-shadow: var(--shadow-sm);
}
.stat-num { font-size: 30px; font-weight: 800; color: var(--primary); letter-spacing: -.5px; }
.stat-card.ok .stat-num { color: var(--success); }
.stat-card.warn .stat-num { color: var(--warning); }
.stat-label { color: var(--muted); font-size: 13px; margin-top: 4px; }
.table { width: 100%; border-collapse: collapse; }
.table td { padding: 11px 6px; border-bottom: 1px solid var(--border); }

/* ---------- 响应式 ---------- */
@media (max-width: 760px) {
  .admin-body { flex-direction: column; }
  .sidebar { width: 100%; flex-direction: row; align-items: center; }
  .side-nav { flex-direction: row; overflow-x: auto; }
  .side-foot { display: none; }
  .header-inner { flex-wrap: wrap; height: auto; padding: 12px 0; gap: 8px; }
  .hero h1 { font-size: 26px; }
}

/* ---------- 签到中心 ---------- */
.rule-bar {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px; margin: 6px 0 22px;
}
.rule-item {
  display: flex; gap: 12px; align-items: flex-start;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 14px; padding: 16px; box-shadow: var(--shadow-sm);
}
.rule-item b { font-size: 14px; }
.rule-item p { margin: 3px 0 0; font-size: 12.5px; color: var(--muted); line-height: 1.6; }
.rule-dot {
  flex: none; width: 10px; height: 10px; margin-top: 5px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  box-shadow: 0 0 0 4px var(--primary-soft);
}

.sign-task {
  border: 1px solid var(--border); border-radius: 14px; padding: 18px;
  margin-bottom: 14px; background: #fff; box-shadow: var(--shadow-sm); transition: .2s;
}
.sign-task:hover { box-shadow: var(--shadow); }
.sign-task-head { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px; }
.sign-task-head strong { font-size: 16px; }
.sign-task-meta {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 10px 16px; margin-top: 14px;
  padding-top: 14px; border-top: 1px dashed var(--border);
}
.meta-cell { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.meta-cell label { font-size: 11.5px; color: var(--muted); }
.meta-cell b { font-size: 13.5px; font-weight: 600; word-break: break-all; }
.meta-cell code { background: #f1f5f9; padding: 1px 6px; border-radius: 5px; font-size: 12px; }
.sign-result {
  background: #0b1220; color: #d7e3f4; border-radius: 10px; padding: 12px 14px;
  font-size: 12px; line-height: 1.75; overflow-x: auto;
  white-space: pre-wrap; word-break: break-all; margin-top: 12px;
}
.sign-panel h3 { margin-bottom: 8px; }
details summary { cursor: pointer; color: var(--primary); margin-top: 10px; }