/* TopUp Platform - Main Stylesheet */

/* ========== RESET & BASE ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #0066FF;
    --primary-dark: #0052CC;
    --secondary: #6B7280;
    --success: #10B981;
    --danger: #EF4444;
    --warning: #F59E0B;
    --light: #F3F4F6;
    --dark: #1F2937;
    --white: #FFFFFF;
    --border: #E5E7EB;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background-color: var(--white);
}

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

/* ========== HEADER ========== */
.header {
    background: var(--white);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo img {
    height: 40px;
}

.nav {
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    transition: color 0.3s;
}

.nav a:hover {
    color: var(--primary);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
}

/* ========== BUTTONS ========== */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    border: none;
    transition: all 0.3s;
}

.btn-primary {
    background: var(--primary);
    color: var(--white);
}

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

.btn-secondary {
    background: var(--light);
    color: var(--dark);
}

.btn-secondary:hover {
    background: var(--border);
}

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 14px;
}

/* ========== HERO ========== */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--white);
    padding: 80px 0;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.9;
}

/* ========== FORMS ========== */
.topup-form-card {
    background: var(--white);
    border-radius: 12px;
    padding: 40px;
    box-shadow: var(--shadow-lg);
    color: var(--dark);
}

.topup-form-card h2 {
    margin-bottom: 30px;
    color: var(--dark);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark);
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

.form-group small {
    display: block;
    margin-top: 5px;
    color: var(--secondary);
    font-size: 14px;
}

.input-group {
    display: flex;
    gap: 10px;
}

.input-group .form-control {
    flex: 1;
}

/* ========== ORDER SUMMARY ========== */
.order-summary {
    background: var(--light);
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
}

.order-summary h3 {
    margin-bottom: 15px;
    font-size: 18px;
}

.summary-row {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
}

.summary-row.total {
    font-weight: 700;
    font-size: 20px;
    border-bottom: none;
    margin-top: 10px;
    color: var(--primary);
}

.summary-row.discount {
    color: var(--success);
}

/* ========== FEATURES ========== */
.features {
    padding: 80px 0;
    background: var(--light);
}

.features h2 {
    margin-bottom: 50px;
    font-size: 36px;
}

.text-center {
    text-align: center;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--white);
    padding: 40px 30px;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-card h3 {
    margin-bottom: 15px;
    color: var(--dark);
}

.feature-card p {
    color: var(--secondary);
}

/* ========== OPERATORS ========== */
.popular-operators {
    padding: 80px 0;
}

.popular-operators h2 {
    margin-bottom: 50px;
    font-size: 36px;
}

.operators-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 30px;
}

.operator-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    transition: all 0.3s;
}

.operator-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.operator-card img {
    height: 60px;
    margin-bottom: 15px;
}

.operator-card h4 {
    margin-bottom: 10px;
}

.operator-card p {
    color: var(--secondary);
    margin-bottom: 15px;
    font-size: 14px;
}

/* ========== ALERTS ========== */
.alert {
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-weight: 500;
}

.alert-success {
    background: #D1FAE5;
    color: #065F46;
    border: 1px solid #10B981;
}

.alert-error {
    background: #FEE2E2;
    color: #991B1B;
    border: 1px solid #EF4444;
}

.alert-warning {
    background: #FEF3C7;
    color: #92400E;
    border: 1px solid #F59E0B;
}

/* ========== FOOTER ========== */
.footer {
    background: var(--dark);
    color: var(--white);
    padding: 60px 0 20px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h3, .footer-col h4 {
    margin-bottom: 20px;
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-col a:hover {
    color: var(--white);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.payment-methods {
    max-width: 200px;
    margin-top: 10px;
}

/* ========== TABLES ========== */
.table {
    width: 100%;
    border-collapse: collapse;
    background: var(--white);
}

.table th,
.table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.table th {
    background: var(--light);
    font-weight: 600;
}

.table tbody tr:hover {
    background: var(--light);
}

/* ========== BADGES ========== */
.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.badge-success {
    background: #D1FAE5;
    color: #065F46;
}

.badge-warning {
    background: #FEF3C7;
    color: #92400E;
}

.badge-danger {
    background: #FEE2E2;
    color: #991B1B;
}

.badge-info {
    background: #DBEAFE;
    color: #1E40AF;
}

/* ========== CARDS ========== */
.card {
    background: var(--white);
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.card-header {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border);
}

.card-title {
    font-size: 20px;
    font-weight: 700;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
    .nav {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .hero h1 {
        font-size: 32px;
    }
    
    .topup-form-card {
        padding: 30px 20px;
    }
    
    .features-grid,
    .operators-grid {
        grid-template-columns: 1fr;
    }
}

/* ========== UTILITIES ========== */
.mt-10 { margin-top: 10px; }
.mt-20 { margin-top: 20px; }
.mb-10 { margin-bottom: 10px; }
.mb-20 { margin-bottom: 20px; }
.p-20 { padding: 20px; }
.text-right { text-align: right; }
.text-left { text-align: left; }