/* ============================================================
   前台样式 —— 手机优先（家长主要在微信里打开），零外部依赖
   ============================================================ */

:root {
  --primary:      #2563eb;
  --primary-dark: #1d4ed8;
  --primary-soft: #eff6ff;
  --accent:       #0d9488;
  --bg:           #f5f7fa;
  --card:         #ffffff;
  --text:         #1f2937;
  --muted:        #6b7280;
  --border:       #e5e7eb;
  --danger:       #dc2626;
  --radius:       12px;
  --shadow:       0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.6;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }

.container { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
main.container { padding-top: 24px; padding-bottom: 48px; }

/* ---------- 顶部导航 ---------- */
.site-header {
  background: #fff;
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
}
.header-inner { display: flex; align-items: center; height: 60px; gap: 16px; }
.logo { font-size: 20px; font-weight: 700; color: var(--primary); white-space: nowrap; }
.logo:hover { text-decoration: none; }
.site-nav { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.site-nav a {
  color: var(--text); padding: 8px 12px; border-radius: 8px; font-size: 15px;
  white-space: nowrap;
}
.site-nav a:hover { background: var(--primary-soft); color: var(--primary); text-decoration: none; }
.site-nav .nav-register { color: var(--primary); font-weight: 600; }
.nav-toggle {
  display: none; margin-left: auto; background: none; border: 1px solid var(--border);
  border-radius: 8px; width: 40px; height: 40px; font-size: 18px; cursor: pointer; color: var(--text);
}

/* 手机端: 折叠菜单 */
@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .site-nav {
    display: none; position: absolute; top: 60px; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--border);
    flex-direction: column; align-items: stretch; padding: 8px 16px 16px;
  }
  .site-nav.nav-open { display: flex; }
  .site-nav a { padding: 12px 8px; border-bottom: 1px solid var(--bg); border-radius: 0; }
  .site-nav a:last-child { border-bottom: none; }
}

/* ---------- 公告横幅 ---------- */
.announcement { background: var(--primary-soft); border-bottom: 1px solid #dbeafe; }
.announcement .container { padding: 10px 16px; color: var(--primary-dark); font-size: 14px; }

/* ---------- 首页 ---------- */
.hero {
  background: linear-gradient(135deg, #1e40af, #2563eb 55%, #0d9488);
  color: #fff; border-radius: var(--radius); padding: 40px 24px; margin-bottom: 28px;
}
.hero h1 { font-size: 26px; margin-bottom: 8px; }
.hero p { opacity: .9; font-size: 15px; }
.hero .btn { margin-top: 18px; }

.cat-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.cat-chip {
  background: #fff; border: 1px solid var(--border); border-radius: 999px;
  padding: 6px 18px; font-size: 14px; color: var(--text);
}
.cat-chip:hover, .cat-chip.active { background: var(--primary); border-color: var(--primary); color: #fff; text-decoration: none; }

.section-title { font-size: 20px; font-weight: 700; margin: 28px 0 16px; display: flex; align-items: center; justify-content: space-between; }
.section-title .more { font-size: 14px; font-weight: 400; }

/* ---------- 课程卡片 ---------- */
.course-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 16px; }
.course-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; display: flex; flex-direction: column; transition: box-shadow .15s;
  position: relative;
}
.course-card:hover { box-shadow: var(--shadow); text-decoration: none; }
.course-card-head {
  background: linear-gradient(135deg, #eff6ff, #f0fdfa);
  padding: 18px 18px 12px; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 10px;
}
.course-card-head .subj {
  background: var(--primary); color: #fff; border-radius: 10px;
  width: 46px; height: 46px; display: flex; align-items: center; justify-content: center;
  font-size: 18px; font-weight: 700; flex-shrink: 0;
}
.course-card-head .name { font-weight: 600; font-size: 15px; line-height: 1.4; color: var(--text); }
.course-card-body { padding: 12px 18px; flex: 1; display: flex; flex-direction: column; gap: 8px; }
.course-card-body p { font-size: 14px; color: var(--muted); display: flex; gap: 6px; }
.course-card-foot {
  padding: 12px 18px; border-top: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
}
.price { color: #e11d48; font-weight: 700; font-size: 18px; }
.price small { font-size: 12px; font-weight: 400; }
.seats { font-size: 13px; color: var(--muted); }
.seats.warn { color: var(--danger); font-weight: 600; }
.course-full-overlay {
  position: absolute; inset: 0; background: rgba(255,255,255,.82);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; font-weight: 700; color: var(--danger);
}

/* ---------- 通用卡片 ---------- */
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; margin-bottom: 16px;
}
.card h3 { font-size: 17px; margin-bottom: 12px; }
.card h2 { font-size: 20px; margin-bottom: 12px; }

/* ---------- 徽章（状态标签） ---------- */
.badge {
  display: inline-block; padding: 3px 10px; border-radius: 999px;
  font-size: 13px; font-weight: 600; line-height: 1.5; white-space: nowrap;
}
.badge-orange { background: #fffbeb; color: #b45309; }
.badge-blue   { background: #eff6ff; color: #1d4ed8; }
.badge-green  { background: #f0fdf4; color: #15803d; }
.badge-teal   { background: #f0fdfa; color: #0f766e; }
.badge-gray   { background: #f3f4f6; color: #4b5563; }
.badge-red    { background: #fef2f2; color: #b91c1c; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block; border: 1px solid transparent; border-radius: 10px;
  padding: 10px 20px; font-size: 15px; font-weight: 600; cursor: pointer;
  text-align: center; line-height: 1.4; background: var(--primary); color: #fff;
  transition: opacity .15s;
}
.btn:hover { opacity: .9; text-decoration: none; color: #fff; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-outline { background: #fff; color: var(--primary); border-color: var(--primary); }
.btn-outline:hover { background: var(--primary-soft); color: var(--primary); }
.btn-danger { background: var(--danger); }
.btn-success { background: #16a34a; }
.btn-gray { background: #6b7280; }
.btn-white { background: #fff; color: var(--primary); }
.btn-sm { padding: 6px 12px; font-size: 13px; border-radius: 8px; }
.btn-block { display: block; width: 100%; }
.btn-link { background: none; border: none; color: var(--primary); cursor: pointer; font-size: 14px; padding: 4px; }

/* ---------- 提示框 ---------- */
.alert { padding: 12px 16px; border-radius: 10px; margin-bottom: 16px; font-size: 14px; border: 1px solid; }
.alert-success { background: #f0fdf4; border-color: #bbf7d0; color: #166534; }
.alert-danger  { background: #fef2f2; border-color: #fecaca; color: #991b1b; }
.alert-info    { background: #eff6ff; border-color: #bfdbfe; color: #1e40af; }
.alert-warning { background: #fffbeb; border-color: #fde68a; color: #92400e; }

/* ---------- 表单 ---------- */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-weight: 600; font-size: 14px; margin-bottom: 6px; }
.form-group input[type="text"], .form-group input[type="tel"], .form-group input[type="password"],
.form-group input[type="number"], .form-group input[type="date"], .form-group input[type="email"],
.form-group select, .form-group textarea {
  width: 100%; border: 1px solid var(--border); border-radius: 10px;
  padding: 10px 12px; font-size: 16px; /* ≥16px 防止 iOS 聚焦自动放大 */
  font-family: inherit; background: #fff; color: var(--text);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}
.form-group textarea { resize: vertical; min-height: 90px; }
.form-hint { font-size: 13px; color: var(--muted); margin-top: 4px; }
.form-error { font-size: 13px; color: var(--danger); margin-top: 4px; }
.form-row { display: flex; gap: 12px; }
.form-row > * { flex: 1; }
@media (max-width: 560px) { .form-row { flex-direction: column; gap: 0; } }

/* ---------- 筛选栏 ---------- */
.filter-bar {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 14px 16px; margin-bottom: 16px;
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center;
}
.filter-bar select, .filter-bar input[type="text"] {
  border: 1px solid var(--border); border-radius: 10px; padding: 9px 12px;
  font-size: 15px; font-family: inherit; background: #fff;
}
.filter-bar input[type="text"] { flex: 1; min-width: 140px; }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; }
.table { width: 100%; border-collapse: collapse; background: #fff; font-size: 14px; }
.table th, .table td { padding: 12px 14px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: middle; }
.table th { background: #f9fafb; font-size: 13px; color: var(--muted); white-space: nowrap; }
.table tr:hover td { background: #fafbfc; }
.table td.actions { white-space: nowrap; }

/* ---------- 时间线 ---------- */
.timeline { list-style: none; padding: 0; margin: 12px 0; }
.timeline li {
  position: relative; padding: 0 0 18px 26px; border-left: 2px solid var(--border); margin-left: 8px;
}
.timeline li:last-child { padding-bottom: 0; }
.timeline li::before {
  content: ""; position: absolute; left: -7px; top: 4px; width: 12px; height: 12px;
  border-radius: 50%; background: #fff; border: 3px solid var(--primary);
}
.timeline li.done::before { background: var(--primary); }
.timeline .t-time { font-size: 13px; color: var(--muted); }
.timeline .t-text { font-size: 15px; }

/* ---------- 缴费页 ---------- */
.pay-amount {
  background: var(--primary-soft); border: 1px solid #dbeafe; border-radius: 10px;
  padding: 14px 16px; font-size: 15px; margin-bottom: 16px;
}
.pay-amount strong { color: #e11d48; font-size: 24px; }
.pay-qr { text-align: center; margin: 12px 0; }
.pay-qr img { width: 200px; height: 200px; border: 1px solid var(--border); border-radius: 10px; }
.pay-qr p { font-size: 13px; color: var(--muted); margin-top: 6px; }
.qr-placeholder {
  width: 200px; height: 200px; margin: 0 auto; border: 1px dashed var(--border);
  border-radius: 10px; display: flex; align-items: center; justify-content: center;
  color: var(--muted); font-size: 14px; text-align: center; padding: 12px;
}
.bank-info {
  background: #f9fafb; border: 1px solid var(--border); border-radius: 10px;
  padding: 12px 14px; font-family: inherit; font-size: 14px; white-space: pre-wrap;
  margin: 10px 0; color: var(--text);
}
.pay-note { font-size: 13px; color: var(--muted); }

/* ---------- 分页 ---------- */
.pagination { display: flex; gap: 8px; justify-content: center; margin: 24px 0 8px; flex-wrap: wrap; }
.pagination a, .pagination .page-cur {
  min-width: 38px; height: 38px; display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border); border-radius: 10px; font-size: 14px;
  background: #fff; color: var(--text); padding: 0 10px;
}
.pagination a:hover { border-color: var(--primary); color: var(--primary); text-decoration: none; }
.pagination .page-cur { background: var(--primary); border-color: var(--primary); color: #fff; }

/* ---------- 空状态 ---------- */
.empty { text-align: center; color: var(--muted); padding: 48px 16px; font-size: 15px; }
.empty .empty-icon { font-size: 40px; display: block; margin-bottom: 8px; }

/* ---------- 详情页 ---------- */
.detail-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 820px) { .detail-grid { grid-template-columns: 2fr 1fr; } }
.kv { display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px dashed var(--border); font-size: 14px; }
.kv:last-child { border-bottom: none; }
.kv .k { color: var(--muted); }
.kv .v { font-weight: 600; text-align: right; }
.admin-note-box { background: #fffbeb; border: 1px solid #fde68a; border-radius: 10px; padding: 12px 14px; font-size: 14px; margin: 12px 0; }

/* ---------- 页脚 ---------- */
.site-footer { background: #1f2937; color: #d1d5db; margin-top: 40px; }
.site-footer .container { padding: 32px 16px 20px; }
.footer-cols { display: grid; grid-template-columns: 1fr; gap: 20px; }
@media (min-width: 720px) { .footer-cols { grid-template-columns: 2fr 1fr; } }
.site-footer strong { color: #fff; font-size: 16px; }
.site-footer p { font-size: 13px; margin-top: 6px; }
.footer-icp { border-top: 1px solid #374151; margin-top: 20px; padding-top: 14px; font-size: 12px; text-align: center; }
.footer-icp a { color: #9ca3af; }

/* ---------- 工具类 ---------- */
.text-muted { color: var(--muted); }
.text-danger { color: var(--danger); }
.text-center { text-align: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; gap: 8px; flex-wrap: wrap; }
.mb { margin-bottom: 16px; }
.mt { margin-top: 16px; }
.list-actions { display: flex; gap: 8px; flex-wrap: wrap; }