:root {
    --primary: #4361ee;
    --primary-dark: #3a56d4;
    --primary-light: #eef2ff;
    --header-bg: #1e293b;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --card-shadow: 0 1px 3px rgba(0,0,0,0.08);
    --card-hover-shadow: 0 8px 25px rgba(0,0,0,0.1);
}

body {
    background: #f1f5f9;
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }

/* Header */
.site-header {
    background: var(--header-bg);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.site-header .navbar-brand {
    font-size: 1.4rem;
    font-weight: 700;
    color: #fff !important;
    letter-spacing: 1px;
}

.site-header .nav-link {
    color: rgba(255,255,255,0.8) !important;
    font-size: 0.95rem;
    padding: 0.5rem 1rem !important;
    transition: color 0.2s;
}

.site-header .nav-link:hover,
.site-header .nav-link.active {
    color: #fff !important;
}

.site-header .user-info .btn {
    font-size: 0.9rem;
}

.balance-badge {
    background: rgba(255,255,255,0.15);
    color: #fbbf24 !important;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

/* Hero / Search */
.hero-section {
    background: linear-gradient(135deg, var(--primary) 0%, #7c3aed 100%);
    padding: 50px 0 40px;
    color: #fff;
    text-align: center;
}

.hero-section h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.hero-section p {
    opacity: 0.85;
    margin-bottom: 25px;
}

.search-box {
    max-width: 600px;
    margin: 0 auto;
    position: relative;
}

.search-box input {
    width: 100%;
    padding: 14px 60px 14px 20px;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
    outline: none;
}

.search-box input:focus {
    box-shadow: 0 4px 25px rgba(0,0,0,0.2);
}

.search-box .btn-search {
    position: absolute;
    right: 6px;
    top: 6px;
    bottom: 6px;
    width: 48px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    border: none;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background 0.2s;
}

.search-box .btn-search:hover {
    background: var(--primary-dark);
}

/* Category tabs */
.category-tabs {
    background: #fff;
    padding: 15px 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 25px;
}

.category-tabs .nav {
    justify-content: center;
}

.category-tabs .nav-link {
    color: var(--text-secondary);
    padding: 6px 18px;
    border-radius: 20px;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.category-tabs .nav-link:hover {
    background: var(--primary-light);
    color: var(--primary);
}

.category-tabs .nav-link.active {
    background: var(--primary);
    color: #fff;
}

/* Resource cards */
.resource-card {
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
    transition: all 0.3s ease;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.resource-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--card-hover-shadow);
}

.resource-card .card-thumb {
    height: 180px;
    overflow: hidden;
    position: relative;
    background: #e2e8f0;
}

.resource-card .card-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.resource-card:hover .card-thumb img {
    transform: scale(1.05);
}

.resource-card .card-thumb .badge-type {
    position: absolute;
    top: 10px;
    left: 10px;
    background: var(--primary);
    color: #fff;
    padding: 3px 10px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
}

.resource-card .card-body {
    padding: 16px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.resource-card .card-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.resource-card .card-title a {
    color: var(--text-primary);
}

.rule-box {
    background: linear-gradient(180deg, #f8faff 0%, #f5f7ff 100%);
    border: 1px solid #dfe7ff;
    border-radius: 12px;
    padding: 18px 20px;
    box-shadow: 0 4px 12px rgba(67, 97, 238, 0.05);
}

.rule-title {
    margin: 0 0 12px;
    color: var(--primary-dark);
    font-weight: 700;
}

.rule-list {
    margin: 0 0 12px;
    padding-left: 1.2rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.rule-list li + li {
    margin-top: 4px;
}

.agreement-box {
    margin-top: 8px;
    display: flex;
    align-items: flex-start;
    gap: 10px;
    color: var(--text-primary);
}

.agreement-box .form-check-input {
    margin-top: 0.25rem;
    width: 1.1rem;
    height: 1.1rem;
}

.agreement-box .form-check-label {
    line-height: 1.6;
    cursor: pointer;
}

.resource-card .card-title a:hover {
    color: var(--primary);
}

.resource-card .card-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 12px;
    flex: 1;
}

.resource-card .card-footer-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

.resource-card .price {
    color: #ef4444;
    font-weight: 700;
    font-size: 1.1rem;
}

.resource-card .price .unit {
    font-size: 0.8rem;
    font-weight: 400;
}

.resource-card .meta {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Detail page */
.resource-detail {
    background: #fff;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    overflow: hidden;
}

.resource-detail .detail-header {
    padding: 30px;
    border-bottom: 1px solid var(--border-color);
}

.resource-detail .detail-header h1 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 15px;
}

.resource-detail .detail-meta {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.resource-detail .detail-meta span i {
    margin-right: 5px;
    color: var(--primary);
}

.resource-detail .detail-body {
    padding: 30px;
}

.resource-detail .detail-body img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 10px 0;
}

.resource-detail .detail-sidebar {
    padding: 30px;
    background: #f8fafc;
    border-left: 1px solid var(--border-color);
}

.download-box {
    background: #fff;
    border-radius: 12px;
    padding: 25px;
    text-align: center;
    box-shadow: var(--card-shadow);
    position: sticky;
    top: 90px;
}

.download-box .price-display {
    font-size: 2rem;
    color: #ef4444;
    font-weight: 700;
    margin: 15px 0;
}

.download-box .price-display .unit {
    font-size: 1rem;
    font-weight: 400;
}

.download-box .btn-download {
    width: 100%;
    padding: 12px;
    font-size: 1.05rem;
    font-weight: 600;
    border-radius: 8px;
}

.download-box .balance-info {
    margin-top: 15px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* User dashboard */
.dashboard-card {
    background: #fff;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    padding: 25px;
}

.stat-card {
    text-align: center;
    padding: 30px 20px;
}

.stat-card .stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.stat-card .stat-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-card .stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 5px;
}

/* Tables */
.table-card {
    background: #fff;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    overflow: hidden;
}

.table-card .table-header {
    padding: 20px 25px;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    font-size: 1.05rem;
}

.table-card .table {
    margin: 0;
}

.table-card .table th {
    background: #f8fafc;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-secondary);
    border-bottom: 2px solid var(--border-color);
}

.table-card .table td {
    vertical-align: middle;
    font-size: 0.9rem;
}

/* Auth pages */
.auth-wrapper {
    min-height: calc(100vh - 200px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 0;
}

.auth-card {
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.08);
    padding: 40px;
    width: 100%;
    max-width: 420px;
    margin: 0 auto;
}

.auth-card h2 {
    text-align: center;
    margin-bottom: 30px;
    font-weight: 700;
    color: var(--text-primary);
}

.auth-card .form-control {
    padding: 12px 16px;
    border-radius: 8px;
    border: 1.5px solid var(--border-color);
    font-size: 0.95rem;
}

.auth-card .form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(67,97,238,0.15);
}

.auth-card .btn-primary {
    padding: 12px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    background: var(--primary);
    border: none;
}

.auth-card .btn-primary:hover {
    background: var(--primary-dark);
}

/* Footer */
.site-footer {
    background: var(--header-bg);
    color: rgba(255,255,255,0.6);
    padding: 30px 0;
    margin-top: 50px;
    text-align: center;
    font-size: 0.9rem;
}

/* Buttons */
.btn-primary {
    background: var(--primary);
    border-color: var(--primary);
}

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
}

.btn-outline-primary {
    color: var(--primary);
    border-color: var(--primary);
}

.btn-outline-primary:hover {
    background: var(--primary);
    border-color: var(--primary);
}

/* Toast */
.toast-container {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: 9999;
}

/* Ad banner */
.ad-banner-wrap {
    width: 960px;
    max-width: 100%;
    margin: 20px auto;
    text-align: center;
    overflow: hidden;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-section { padding: 30px 0 25px; }
    .hero-section h1 { font-size: 1.5rem; }
    .resource-card .card-thumb { height: 150px; }
    .download-box { position: static; margin-top: 20px; }
    .resource-detail .detail-sidebar { border-left: none; border-top: 1px solid var(--border-color); }
    .auth-card { margin: 0 15px; padding: 30px 20px; }
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 15px;
    opacity: 0.4;
}

/* Recharge */
.recharge-card {
    background: #fff;
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--card-shadow);
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    border: 2px solid transparent;
}

.recharge-card:hover {
    border-color: var(--primary);
}

.recharge-card.selected {
    border-color: var(--primary);
    background: var(--primary-light);
}

.recharge-card .amount {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
}

.recharge-card .price-tag {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-top: 8px;
}