* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --ok: #16a34a;
  --err: #dc2626;
}
body { font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; }
.container { max-width: 860px; margin: 0 auto; padding: 0 16px; }

.site-header { background: linear-gradient(120deg, #1e3a8a, #2563eb); color: #fff; padding: 28px 0; }
.site-header .logo { font-size: 24px; font-weight: 700; }
.site-header .tagline { opacity: .85; margin-top: 4px; font-size: 14px; }

.steps { display: flex; gap: 8px; list-style: none; margin: 24px 0 16px; }
.steps li { flex: 1; text-align: center; padding: 10px 4px; background: var(--card); border: 1px solid var(--border); border-radius: 10px; color: var(--muted); font-size: 14px; }
.steps li span { display: inline-flex; width: 22px; height: 22px; align-items: center; justify-content: center; border-radius: 50%; background: var(--border); margin-right: 6px; font-size: 12px; }
.steps li.active { border-color: var(--primary); color: var(--primary); font-weight: 600; }
.steps li.active span { background: var(--primary); color: #fff; }
.steps li.done { color: var(--ok); border-color: var(--ok); }
.steps li.done span { background: var(--ok); color: #fff; }

.panel { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 24px; margin-bottom: 20px; }
.hidden { display: none !important; }
.muted { color: var(--muted); }
.small { font-size: 13px; }

.dropzone { border: 2px dashed #c3d0e8; border-radius: 12px; padding: 48px 16px; text-align: center; cursor: pointer; transition: .15s; }
.dropzone:hover, .dropzone.dragover { border-color: var(--primary); background: #eff4ff; }
.dz-icon { font-size: 36px; }
.dz-title { font-size: 17px; font-weight: 600; margin-top: 8px; }
.dz-hint { color: var(--muted); font-size: 13px; margin-top: 4px; }

.status { margin-top: 14px; padding: 10px 14px; border-radius: 8px; font-size: 14px; }
.status.info { background: #eff6ff; color: var(--primary-dark); }
.status.error { background: #fef2f2; color: var(--err); }
.status.loading::before { content: ""; display: inline-block; width: 14px; height: 14px; border: 2px solid var(--primary); border-top-color: transparent; border-radius: 50%; margin-right: 8px; vertical-align: -2px; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.file-info { display: flex; align-items: center; gap: 10px; padding-bottom: 14px; border-bottom: 1px solid var(--border); margin-bottom: 16px; flex-wrap: wrap; }
#fi-name { font-weight: 600; }
.link-btn { background: none; border: none; color: var(--primary); cursor: pointer; font-size: 14px; text-decoration: underline; }

h3 { margin: 18px 0 10px; font-size: 16px; }
.direction-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
.direction-grid button { padding: 12px 8px; border: 1.5px solid var(--border); background: #fff; border-radius: 10px; cursor: pointer; font-size: 14px; transition: .12s; }
.direction-grid button:hover { border-color: var(--primary); }
.direction-grid button.selected { border-color: var(--primary); background: #eff4ff; color: var(--primary-dark); font-weight: 600; }

.pricing-note { background: #fffbeb; border: 1px solid #fde68a; color: #92400e; padding: 8px 12px; border-radius: 8px; font-size: 13px; margin-bottom: 12px; }
#card-inputs input { display: block; width: 100%; max-width: 360px; margin-bottom: 10px; padding: 10px 12px; border: 1.5px solid var(--border); border-radius: 8px; font-size: 15px; font-family: Consolas, monospace; letter-spacing: 1px; text-transform: uppercase; }
#card-inputs input:focus { outline: none; border-color: var(--primary); }

.primary-btn { display: inline-block; background: var(--primary); color: #fff; border: none; padding: 12px 32px; border-radius: 10px; font-size: 16px; cursor: pointer; margin-top: 12px; text-decoration: none; transition: .12s; }
.primary-btn:hover:not(:disabled) { background: var(--primary-dark); }
.primary-btn:disabled { opacity: .45; cursor: not-allowed; }

.done-box { text-align: center; padding: 16px 0; }
.done-icon { font-size: 44px; }
.done-title { font-size: 20px; font-weight: 700; margin: 8px 0 4px; }

.privacy-note { margin-top: 14px; padding: 10px 14px; background: #f0fdf4; border: 1px solid #bbf7d0; color: #166534; border-radius: 8px; font-size: 13px; }
.direction-note { margin-top: 10px; padding: 8px 12px; background: #eff6ff; border: 1px solid #bfdbfe; color: #1e40af; border-radius: 8px; font-size: 13px; }
.file-list { margin: -6px 0 14px; padding: 8px 12px; background: #f8fafc; border: 1px solid var(--border); border-radius: 8px; font-size: 13px; color: var(--muted); max-height: 140px; overflow-y: auto; }

.notes { background: none; border: none; padding: 0 6px; }
.notes h4 { margin-bottom: 6px; }
.notes ul { padding-left: 20px; color: var(--muted); font-size: 14px; }

.site-footer { padding: 24px 0 32px; text-align: center; }

/* ===== 管理后台 ===== */
.admin-nav { display: flex; gap: 16px; align-items: center; padding: 14px 0; }
.admin-nav a { color: var(--primary); text-decoration: none; font-weight: 600; }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 12px; margin-bottom: 20px; }
.stat-card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 14px; }
.stat-card .v { font-size: 24px; font-weight: 700; }
.stat-card .k { color: var(--muted); font-size: 13px; }
table.data { width: 100%; border-collapse: collapse; background: var(--card); border-radius: 10px; overflow: hidden; font-size: 13.5px; }
table.data th, table.data td { padding: 8px 10px; border-bottom: 1px solid var(--border); text-align: left; }
table.data th { background: #f1f5fb; font-weight: 600; }
.tbl-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: 10px; margin-bottom: 20px; }
.tag { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: 12px; }
.tag.success, .tag.unused { background: #dcfce7; color: #166534; }
.tag.failed, .tag.void { background: #fee2e2; color: #991b1b; }
.tag.used, .tag.processing { background: #e0e7ff; color: #3730a3; }
.form-row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 12px; }
.form-row input, .form-row select { padding: 8px 10px; border: 1.5px solid var(--border); border-radius: 8px; font-size: 14px; }
.codes-box { background: #0f172a; color: #a5f3fc; font-family: Consolas, monospace; padding: 14px; border-radius: 10px; max-height: 260px; overflow: auto; white-space: pre; font-size: 14px; }
.log-box { max-height: 65vh; color: #cbd5e1; font-size: 12.5px; line-height: 1.5; }
.bar-chart { display: flex; align-items: flex-end; gap: 3px; height: 120px; padding: 10px 0; }
.bar-chart .bar { flex: 1; background: var(--primary); border-radius: 3px 3px 0 0; min-height: 2px; position: relative; }
.bar-chart .bar:hover::after { content: attr(data-tip); position: absolute; bottom: 105%; left: 50%; transform: translateX(-50%); background: #111; color: #fff; font-size: 11px; padding: 3px 8px; border-radius: 6px; white-space: nowrap; z-index: 5; }
.login-box { max-width: 360px; margin: 80px auto; }
.login-box input { width: 100%; padding: 11px 12px; border: 1.5px solid var(--border); border-radius: 8px; font-size: 15px; margin: 10px 0; }
.pagination { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; }
.pagination a { padding: 4px 10px; border: 1px solid var(--border); border-radius: 6px; text-decoration: none; color: var(--text); }
.pagination a.cur { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ===== 手机端适配 ===== */
@media (max-width: 640px) {
  .container { padding: 0 12px; }
  .site-header { padding: 20px 0; }
  .site-header .logo { font-size: 20px; }
  .site-header .tagline { font-size: 12.5px; }

  .steps { gap: 6px; margin: 16px 0 12px; }
  .steps li { font-size: 12px; padding: 8px 2px; }
  .steps li span { width: 18px; height: 18px; font-size: 11px; margin-right: 4px; }

  .panel { padding: 16px; border-radius: 12px; }
  .dropzone { padding: 32px 12px; }
  .dz-title { font-size: 15px; }
  .dz-hint { font-size: 12px; }

  .direction-grid { grid-template-columns: repeat(2, 1fr); }
  .direction-grid button { padding: 12px 6px; font-size: 13.5px; }

  #card-inputs input { max-width: 100%; font-size: 16px; /* ≥16px 避免 iOS 聚焦自动放大 */ }
  .primary-btn { width: 100%; text-align: center; padding: 13px 0; }

  .file-info { font-size: 14px; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); gap: 8px; }
  .stat-card .v { font-size: 19px; }
  table.data { font-size: 12px; }
  table.data th, table.data td { padding: 6px 8px; white-space: nowrap; }
  .form-row input, .form-row select { width: 100%; }
  .admin-nav { flex-wrap: wrap; gap: 10px; font-size: 14px; }
  .codes-box { font-size: 12px; }
}

@media (max-width: 380px) {
  .direction-grid { grid-template-columns: 1fr; }
  .steps li { font-size: 11px; }
}