/* ===== Reset & Base ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --primary: #4f46e5;
  --primary-light: #818cf8;
  --primary-dark: #3730a3;
  --primary-bg: #eef2ff;
  --success: #16a34a;
  --success-bg: #dcfce7;
  --warning: #d97706;
  --warning-bg: #fef3c7;
  --danger: #dc2626;
  --danger-bg: #fee2e2;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.08), 0 4px 6px rgba(0,0,0,0.03);
}
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--gray-50);
  color: var(--gray-800);
  line-height: 1.6;
  font-size: 14px;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== Layout ===== */
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
.navbar {
  background: #fff;
  border-bottom: 1px solid var(--gray-200);
  padding: 12px 0;
  position: sticky; top: 0; z-index: 100;
  box-shadow: var(--shadow);
}
.navbar-inner { display: flex; justify-content: space-between; align-items: center; }
.navbar-brand { font-size: 20px; font-weight: 700; color: var(--primary); }
.navbar-nav { display: flex; gap: 8px; align-items: center; }
.navbar-nav a, .navbar-nav button {
  padding: 8px 16px; border-radius: var(--radius-sm); border: none;
  background: transparent; color: var(--gray-600); font-size: 14px;
  cursor: pointer; transition: all .2s; text-decoration: none;
  display: inline-flex; align-items: center; gap: 4px;
}
.navbar-nav a:hover, .navbar-nav button:hover { background: var(--gray-100); color: var(--gray-800); text-decoration: none; }
.navbar-nav a.active { background: var(--primary-bg); color: var(--primary); font-weight: 500; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 10px 20px; border-radius: var(--radius-sm); border: none;
  font-size: 14px; font-weight: 500; cursor: pointer; transition: all .2s;
  text-decoration: none; white-space: nowrap;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: var(--gray-100); color: var(--gray-700); }
.btn-secondary:hover { background: var(--gray-200); }
.btn-success { background: var(--success); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #b91c1c; }
.btn-outline { background: transparent; border: 1px solid var(--gray-300); color: var(--gray-700); }
.btn-outline:hover { background: var(--gray-100); }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-lg { padding: 12px 28px; font-size: 16px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-block { width: 100%; }

/* ===== Forms ===== */
.form-group { margin-bottom: 16px; }
.form-label { display: block; margin-bottom: 6px; font-weight: 500; color: var(--gray-700); font-size: 14px; }
.form-input, .form-select, .form-textarea {
  width: 100%; padding: 10px 14px; border: 1px solid var(--gray-300);
  border-radius: var(--radius-sm); font-size: 14px; transition: border-color .2s, box-shadow .2s;
  background: #fff; color: var(--gray-800); font-family: inherit;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79,70,229,.1);
}
.form-textarea { min-height: 120px; resize: vertical; }
.form-hint { font-size: 12px; color: var(--gray-500); margin-top: 4px; }
.form-error { font-size: 13px; color: var(--danger); margin-top: 4px; }

/* ===== Cards ===== */
.card {
  background: #fff; border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 24px; margin-bottom: 20px;
}
.card-title { font-size: 18px; font-weight: 600; margin-bottom: 16px; color: var(--gray-900); }

/* ===== Stats Cards (Admin Dashboard) ===== */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-card {
  background: #fff; border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow);
  border-left: 4px solid var(--primary);
}
.stat-card .stat-label { font-size: 13px; color: var(--gray-500); margin-bottom: 8px; }
.stat-card .stat-value { font-size: 28px; font-weight: 700; color: var(--gray-900); }
.stat-card .stat-sub { font-size: 12px; color: var(--gray-400); margin-top: 4px; }
.stat-card.success { border-left-color: var(--success); }
.stat-card.warning { border-left-color: var(--warning); }
.stat-card.danger { border-left-color: var(--danger); }

/* ===== Tables ===== */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th { text-align: left; padding: 12px 16px; font-size: 13px; font-weight: 600; color: var(--gray-500); border-bottom: 2px solid var(--gray-200); white-space: nowrap; }
td { padding: 12px 16px; font-size: 14px; border-bottom: 1px solid var(--gray-100); }
tr:hover td { background: var(--gray-50); }

/* ===== Badges ===== */
.badge { display: inline-block; padding: 3px 10px; border-radius: 20px; font-size: 12px; font-weight: 500; }
.badge-success { background: var(--success-bg); color: var(--success); }
.badge-warning { background: var(--warning-bg); color: var(--warning); }
.badge-danger { background: var(--danger-bg); color: var(--danger); }
.badge-info { background: var(--primary-bg); color: var(--primary); }
.badge-secondary { background: var(--gray-100); color: var(--gray-600); }

/* ===== Modal ===== */
.modal-overlay {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,.4); display: flex; align-items: center; justify-content: center;
  z-index: 1000; padding: 20px;
}
.modal {
  background: #fff; border-radius: var(--radius); max-width: 800px; width: 100%;
  max-height: 90vh; overflow-y: auto; box-shadow: var(--shadow-lg);
}
.modal-header { padding: 20px 24px; border-bottom: 1px solid var(--gray-200); display: flex; justify-content: space-between; align-items: center; }
.modal-header h3 { font-size: 18px; font-weight: 600; }
.modal-close { background: none; border: none; font-size: 24px; color: var(--gray-400); cursor: pointer; padding: 0; line-height: 1; }
.modal-body { padding: 24px; }
.modal-footer { padding: 16px 24px; border-top: 1px solid var(--gray-200); display: flex; justify-content: flex-end; gap: 8px; }

/* ===== Hero (Landing) ===== */
.hero { text-align: center; padding: 60px 20px 40px; }
.hero h1 { font-size: 36px; font-weight: 800; color: var(--gray-900); margin-bottom: 16px; }
.hero p { font-size: 18px; color: var(--gray-500); max-width: 600px; margin: 0 auto 32px; }
.hero-actions { display: flex; gap: 12px; justify-content: center; }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; margin: 40px 0; }
.feature-card { text-align: center; padding: 28px; background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); }
.feature-card .icon { font-size: 32px; margin-bottom: 12px; }
.feature-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 8px; }
.feature-card p { font-size: 14px; color: var(--gray-500); }

/* ===== Auth Forms ===== */
.auth-container { max-width: 420px; margin: 60px auto; }
.auth-card { background: #fff; border-radius: var(--radius); box-shadow: var(--shadow-lg); padding: 40px; }
.auth-card h2 { text-align: center; margin-bottom: 24px; font-size: 24px; }
.auth-tabs { display: flex; margin-bottom: 24px; border-bottom: 2px solid var(--gray-100); }
.auth-tab { flex: 1; padding: 12px; text-align: center; cursor: pointer; font-weight: 500; color: var(--gray-500); border-bottom: 2px solid transparent; margin-bottom: -2px; transition: all .2s; }
.auth-tab.active { color: var(--primary); border-bottom-color: var(--primary); }

/* ===== Submit Page ===== */
.submit-tabs { display: flex; gap: 8px; margin-bottom: 20px; }
.submit-tab { flex: 1; padding: 12px; text-align: center; border: 1px solid var(--gray-300); border-radius: var(--radius-sm); cursor: pointer; font-weight: 500; color: var(--gray-600); transition: all .2s; background: #fff; }
.submit-tab.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.upload-zone { border: 2px dashed var(--gray-300); border-radius: var(--radius); padding: 40px; text-align: center; cursor: pointer; transition: all .2s; }
.upload-zone:hover { border-color: var(--primary); background: var(--primary-bg); }
.upload-zone .icon { font-size: 40px; margin-bottom: 12px; }
.balance-info { display: flex; justify-content: space-between; align-items: center; background: var(--primary-bg); padding: 16px 20px; border-radius: var(--radius-sm); margin-bottom: 20px; }
.balance-info .label { color: var(--gray-600); font-size: 14px; }
.balance-info .value { font-size: 20px; font-weight: 700; color: var(--primary); }

/* ===== Package Cards ===== */
.package-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 20px; }
.package-card { background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); padding: 28px; text-align: center; border: 2px solid transparent; transition: all .2s; position: relative; }
.package-card:hover { border-color: var(--primary-light); transform: translateY(-2px); }
.package-card .pkg-name { font-size: 18px; font-weight: 600; margin-bottom: 12px; }
.package-card .pkg-words { font-size: 32px; font-weight: 800; color: var(--primary); margin-bottom: 4px; }
.package-card .pkg-words-unit { font-size: 14px; color: var(--gray-500); }
.package-card .pkg-price { font-size: 24px; font-weight: 700; margin: 16px 0; }
.package-card .pkg-original-price { font-size: 14px; color: var(--gray-400); text-decoration: line-through; }
.package-card .pkg-badge { position: absolute; top: -10px; left: 50%; transform: translateX(-50%); background: var(--danger); color: #fff; padding: 2px 12px; border-radius: 20px; font-size: 12px; }

/* ===== Result Display ===== */
.result-box { background: var(--gray-50); border: 1px solid var(--gray-200); border-radius: var(--radius-sm); padding: 20px; max-height: 400px; overflow-y: auto; white-space: pre-wrap; word-break: break-all; line-height: 1.8; font-size: 14px; }

/* ===== Pagination ===== */
.pagination { display: flex; gap: 4px; justify-content: center; margin-top: 20px; }
.pagination button { padding: 8px 12px; border: 1px solid var(--gray-300); background: #fff; border-radius: var(--radius-sm); cursor: pointer; font-size: 14px; color: var(--gray-600); }
.pagination button:hover:not(:disabled) { background: var(--primary-bg); border-color: var(--primary); color: var(--primary); }
.pagination button.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.pagination button:disabled { opacity: .4; cursor: not-allowed; }

/* ===== Alerts ===== */
.alert { padding: 12px 16px; border-radius: var(--radius-sm); margin-bottom: 16px; font-size: 14px; }
.alert-danger { background: var(--danger-bg); color: var(--danger); }
.alert-success { background: var(--success-bg); color: var(--success); }
.alert-info { background: var(--primary-bg); color: var(--primary); }

/* ===== Admin Layout ===== */
.admin-layout { display: flex; min-height: calc(100vh - 57px); }
.admin-sidebar { width: 220px; background: #fff; border-right: 1px solid var(--gray-200); padding: 16px 0; flex-shrink: 0; }
.admin-sidebar a { display: flex; align-items: center; gap: 10px; padding: 10px 20px; color: var(--gray-600); font-size: 14px; border-left: 3px solid transparent; }
.admin-sidebar a:hover { background: var(--gray-50); text-decoration: none; }
.admin-sidebar a.active { background: var(--primary-bg); color: var(--primary); border-left-color: var(--primary); font-weight: 500; }
.admin-content { flex: 1; padding: 24px; overflow-x: auto; }

/* ===== Misc ===== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--gray-500); }
.text-primary { color: var(--primary); }
.text-danger { color: var(--danger); }
.text-success { color: var(--success); }
.font-bold { font-weight: 700; }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 16px; }
.mb-2 { margin-bottom: 8px; }
.mb-4 { margin-bottom: 16px; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; }
.gap-4 { gap: 16px; }
.hidden { display: none !important; }
.spinner { display: inline-block; width: 16px; height: 16px; border: 2px solid var(--gray-200); border-top-color: var(--primary); border-radius: 50%; animation: spin .6s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.loading-overlay { text-align: center; padding: 40px; color: var(--gray-400); }
.empty-state { text-align: center; padding: 60px 20px; color: var(--gray-400); }
.empty-state .icon { font-size: 48px; margin-bottom: 16px; }

/* ===== Config Forms ===== */
.config-section { margin-bottom: 32px; }
.config-section h3 { font-size: 16px; font-weight: 600; margin-bottom: 16px; padding-bottom: 8px; border-bottom: 1px solid var(--gray-200); }
.config-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.config-grid .full { grid-column: 1 / -1; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .config-grid { grid-template-columns: 1fr; }
  .admin-sidebar { width: 60px; }
  .admin-sidebar a span { display: none; }
  .hero h1 { font-size: 28px; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
}