/* Reset và base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #1a1a1a;
    background-color: #ffffff;
    font-size: 14px;
}

/* Header */
.header {
    background: #ffffff;
    color: #1a1a1a;
    padding: 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    text-decoration: none;
    color: #ff6b35;
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo::before {
    content: "🎮";
    font-size: 28px;
}

.nav {
    display: flex;
    list-style: none;
    gap: 0;
    align-items: center;
}

.nav a {
    color: #1a1a1a;
    text-decoration: none;
    padding: 12px 20px;
    border-radius: 8px;
    transition: all 0.2s ease;
    font-weight: 500;
    position: relative;
}

.nav a:hover {
    background-color: #f8f9fa;
    color: #ff6b35;
}

.nav a.active {
    background-color: #ff6b35;
    color: white;
}

/* Search bar */
.search-container {
    display: flex;
    align-items: center;
    background: #f8f9fa;
    border-radius: 24px;
    padding: 8px 16px;
    margin: 0 20px;
    flex: 1;
    max-width: 400px;
}

.search-input {
    border: none;
    background: transparent;
    outline: none;
    flex: 1;
    padding: 8px 12px;
    font-size: 14px;
}

.search-icon {
    color: #666;
    font-size: 16px;
}

/* User actions */
.user-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn-login {
    background: #ff6b35;
    color: white;
    padding: 10px 20px;
    border-radius: 20px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.2s ease;
}

.btn-login:hover {
    background: #e55a2b;
    transform: translateY(-1px);
}

/* Main content */
.main-content {
    min-height: calc(100vh - 200px);
    padding: 2rem 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Cards */
.card {
    background: white;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 15px rgba(0,0,0,0.15);
}

.card-header {
    border-bottom: 1px solid #eee;
    padding-bottom: 1rem;
    margin-bottom: 1rem;
}

.card-title {
    font-size: 1.5rem;
    color: #333;
    margin-bottom: 0.5rem;
}

/* Grid system */
.row {
    display: flex;
    flex-wrap: wrap;
    margin: -0.75rem;
}

.col {
    flex: 1;
    padding: 0.75rem;
}

.col-3 {
    flex: 0 0 25%;
    max-width: 25%;
}

.col-4 {
    flex: 0 0 33.333%;
    max-width: 33.333%;
}

.col-6 {
    flex: 0 0 50%;
    max-width: 50%;
}

.col-8 {
    flex: 0 0 66.666%;
    max-width: 66.666%;
}

.col-12 {
    flex: 0 0 100%;
    max-width: 100%;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 5px;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.btn-success {
    background: linear-gradient(135deg, #56ab2f 0%, #a8e6cf 100%);
    color: white;
}

.btn-danger {
    background: linear-gradient(135deg, #ff416c 0%, #ff4b2b 100%);
    color: white;
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

/* Forms */
.form-group {
    margin-bottom: 1rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #555;
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    background-color: white;
}

/* Game cards */
.game-card {
    text-align: center;
    padding: 20px;
    border-radius: 16px;
    background: white;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    transition: all 0.3s ease;
    cursor: pointer;
    border: 1px solid #f0f0f0;
    position: relative;
    overflow: hidden;
}

.game-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(0,0,0,0.15);
    border-color: #ff6b35;
}

.game-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #ff6b35, #f7931e);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.game-card:hover::before {
    opacity: 1;
}

.game-image {
    width: 64px;
    height: 64px;
    border-radius: 12px;
    margin: 0 auto 16px;
    background: linear-gradient(135deg, #ff6b35 0%, #f7931e 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
    box-shadow: 0 4px 12px rgba(255, 107, 53, 0.3);
}

.game-name {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
    color: #1a1a1a;
    line-height: 1.3;
}

.game-description {
    color: #666;
    font-size: 13px;
    line-height: 1.4;
    margin-bottom: 16px;
}

.game-trending {
    position: absolute;
    top: 12px;
    right: 12px;
    background: linear-gradient(135deg, #ff6b35, #f7931e);
    color: white;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.game-brand {
    font-size: 11px;
    color: #999;
    margin-bottom: 8px;
    font-weight: 500;
}

.game-btn {
    background: linear-gradient(135deg, #ff6b35, #f7931e);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    display: inline-block;
}

.game-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(255, 107, 53, 0.4);
}

/* Topup type cards */
.topup-card {
    background: white;
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: all 0.3s;
    cursor: pointer;
    border: 2px solid transparent;
}

.topup-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 15px rgba(0,0,0,0.2);
    border-color: #667eea;
}

.topup-card.selected {
    border-color: #667eea;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
}

.topup-name {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #333;
}

.topup-price {
    font-size: 1.5rem;
    font-weight: bold;
    color: #667eea;
    margin-bottom: 0.5rem;
}

.topup-description {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.topup-type {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 500;
}

.topup-type.account {
    background: #e3f2fd;
    color: #1976d2;
}

.topup-type.id_only {
    background: #f3e5f5;
    color: #7b1fa2;
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 5px;
    margin-bottom: 1rem;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* Footer */
.footer {
    background: #1a1a1a;
    color: white;
    padding: 3rem 0 2rem;
    margin-top: 4rem;
}

.footer a:hover {
    color: #ff6b35 !important;
    transition: color 0.2s ease;
}

/* Login method buttons */
.login-method-btn {
    transition: all 0.3s ease;
}

.login-method-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.login-method-btn.active {
    border-color: #ff6b35 !important;
    background-color: #fff5f2 !important;
    box-shadow: 0 4px 12px rgba(255, 107, 53, 0.2);
}

/* Payment method labels */
label:hover {
    border-color: #ff6b35 !important;
    background-color: #fff5f2;
}

label input[type="radio"]:checked + span {
    color: #ff6b35;
    font-weight: 600;
}

/* Order summary styles */
.order-item {
    padding: 1rem;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    margin-bottom: 1rem;
    background: white;
    transition: all 0.2s ease;
}

.order-item:hover {
    border-color: #ff6b35;
    box-shadow: 0 2px 8px rgba(255, 107, 53, 0.1);
}

/* Sticky order summary */
.sticky-order {
    position: sticky;
    top: 100px;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
}

/* Loading states */
.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem;
    color: #666;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #ff6b35;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 768px) {
    .col-3, .col-4, .col-6, .col-8 {
        flex: 0 0 100%;
        max-width: 100%;
    }
    
    .nav {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .header .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .search-container {
        margin: 1rem 0;
        max-width: 100%;
    }
    
    .login-method-btn {
        min-width: 100%;
        margin-bottom: 1rem;
    }
    
    .sticky-order {
        position: static;
        max-height: none;
    }
}

/* Loading spinner */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
}

.modal-content {
    background-color: white;
    margin: 5% auto;
    padding: 2rem;
    border-radius: 10px;
    width: 90%;
    max-width: 500px;
    position: relative;
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover {
    color: #000;
}

/* Table */
.table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.table th,
.table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

.table th {
    background-color: #f8f9fa;
    font-weight: 600;
    color: #555;
}

.table tbody tr:hover {
    background-color: #f8f9fa;
}