/* ========================================
   CSS Variables & Reset
   ======================================== */
:root {
    /* Colors - Refined minimalist palette */
    --color-bg: #FAFAFA;
    --color-surface: #FFFFFF;
    --color-text: #1A1A1A;
    --color-text-secondary: #6B6B6B;
    --color-border: #E8E8E8;
    
    /* Accent - Tajikistan inspired green */
    --color-primary: #0D9488;
    --color-primary-dark: #0F766E;
    --color-primary-light: #CCFBF1;
    
    /* Operator Colors */
    --megafon-color: #6B21A8;
    --tcell-color: #DC2626;
    --beeline-color: #F59E0B;
    --babilon-color: #2563EB;
    --ttmobile-color: #059669;
    
    /* Typography */
    --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'Space Mono', 'Courier New', monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    
    /* Shadows - Subtle */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.06);
    
    /* Animation */
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   Container & Layout
   ======================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
}

/* ========================================
   Navigation
   ======================================== */
.nav {
    position: sticky;
    top: 0;
    background: rgba(250, 250, 250, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: var(--transition);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--color-text);
    font-weight: 700;
    font-size: 1.25rem;
    transition: var(--transition);
}

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

.logo-icon {
    font-size: 1.5rem;
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    text-decoration: none;
    color: var(--color-text-secondary);
    font-weight: 500;
    font-size: 0.9375rem;
    position: relative;
    transition: var(--transition);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text);
}

.nav-link.active::after {
    width: 100%;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition);
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .menu-toggle {
        display: flex;
    }
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    padding: var(--spacing-2xl) 0;
    background: linear-gradient(135deg, var(--color-bg) 0%, #F0FDFA 100%);
}

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

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.accent {
    color: var(--color-primary);
    position: relative;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    font-weight: 400;
}

/* ========================================
   Search Box
   ======================================== */
.search-box {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    max-width: 700px;
    margin: 0 auto;
}

.search-input-wrapper {
    position: relative;
    margin-bottom: var(--spacing-md);
}

.search-icon {
    position: absolute;
    left: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-secondary);
}

.search-input {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: var(--font-body);
    transition: var(--transition);
    background: var(--color-bg);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-primary);
    background: var(--color-surface);
}

.filters {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-sm);
}

.filter-select {
    padding: 0.75rem 1rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.9375rem;
    font-family: var(--font-body);
    background: var(--color-bg);
    cursor: pointer;
    transition: var(--transition);
}

.filter-select:hover {
    border-color: var(--color-primary);
}

.filter-select:focus {
    outline: none;
    border-color: var(--color-primary);
    background: var(--color-surface);
}

@media (max-width: 640px) {
    .filters {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   Stats Section
   ======================================== */
.stats {
    padding: var(--spacing-xl) 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    text-align: center;
}

.stat-item {
    padding: var(--spacing-lg);
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-primary);
    font-family: var(--font-mono);
    line-height: 1;
}

.stat-label {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    margin-top: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
}

/* ========================================
   Section
   ======================================== */
.section {
    padding: var(--spacing-2xl) 0;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

@media (max-width: 640px) {
    .section-title {
        font-size: 2rem;
    }
}

/* ========================================
   View Toggle
   ======================================== */
.view-toggle {
    display: flex;
    gap: 0.5rem;
    background: var(--color-surface);
    padding: 4px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
}

.toggle-btn {
    padding: 0.5rem;
    background: none;
    border: none;
    cursor: pointer;
    border-radius: 4px;
    color: var(--color-text-secondary);
    transition: var(--transition);
    display: flex;
    align-items: center;
}

.toggle-btn:hover {
    background: var(--color-bg);
}

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

/* ========================================
   Tariffs Grid
   ======================================== */
.tariffs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.tariff-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.tariff-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--operator-color, var(--color-primary));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition);
}

.tariff-card:hover::before {
    transform: scaleX(1);
}

.tariff-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.tariff-card.best {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 1px var(--color-primary-light);
}

.tariff-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.operator-badge {
    display: inline-block;
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: var(--operator-color, var(--color-border));
    color: white;
}

.tariff-badge {
    display: inline-block;
    padding: 0.25rem 0.625rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
}

.tariff-name {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.tariff-type {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.tariff-price {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-text);
    font-family: var(--font-mono);
    margin-bottom: var(--spacing-xs);
}

.tariff-price span {
    font-size: 1rem;
    color: var(--color-text-secondary);
    font-family: var(--font-body);
}

.tariff-features {
    list-style: none;
    margin: var(--spacing-md) 0;
}

.tariff-features li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    font-size: 0.9375rem;
}

.tariff-features li:last-child {
    border-bottom: none;
}

.feature-label {
    color: var(--color-text-secondary);
}

.feature-value {
    font-weight: 600;
    color: var(--color-text);
}

.tariff-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.btn-primary,
.btn-secondary {
    flex: 1;
    padding: 0.875rem 1.5rem;
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-family: var(--font-body);
}

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

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--color-bg);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

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

.btn-secondary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.compare-checkbox {
    margin-right: var(--spacing-xs);
}

@media (max-width: 640px) {
    .tariffs-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   List View
   ======================================== */
.tariffs-grid.list-view {
    grid-template-columns: 1fr;
}

.tariffs-grid.list-view .tariff-card {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: var(--spacing-lg);
    align-items: center;
}

.tariffs-grid.list-view .tariff-header {
    margin: 0;
}

.tariffs-grid.list-view .tariff-features {
    display: flex;
    gap: var(--spacing-lg);
    margin: 0;
}

.tariffs-grid.list-view .tariff-features li {
    border: none;
    padding: 0;
}

/* ========================================
   Load More
   ======================================== */
.load-more {
    text-align: center;
    margin-top: var(--spacing-xl);
}

/* ========================================
   Promotions
   ======================================== */
.promotions-section {
    background: var(--color-surface);
}

.promotions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.promo-card {
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-bg) 100%);
    border: 1px solid var(--color-primary);
    position: relative;
    overflow: hidden;
}

.promo-card::before {
    content: '🎁';
    position: absolute;
    top: -10px;
    right: -10px;
    font-size: 4rem;
    opacity: 0.1;
}

.promo-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.promo-desc {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.promo-validity {
    font-size: 0.875rem;
    color: var(--color-primary-dark);
    font-weight: 500;
}

/* ========================================
   Operators Grid
   ======================================== */
.operators-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: var(--spacing-lg);
}

.operator-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    transition: var(--transition);
}

.operator-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.operator-logo {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: white;
    font-size: 0.875rem;
}

.operator-logo.megafon { background: var(--megafon-color); }
.operator-logo.tcell { background: var(--tcell-color); }
.operator-logo.beeline { background: var(--beeline-color); }
.operator-logo.babilon { background: var(--babilon-color); }
.operator-logo.ttmobile { background: var(--ttmobile-color); }

.operator-name {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.operator-info {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.operator-link {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9375rem;
    transition: var(--transition);
}

.operator-link:hover {
    color: var(--color-primary-dark);
}

/* ========================================
   Comparison
   ======================================== */
.comparison-info {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.comparison-info p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.comparison-table {
    overflow-x: auto;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.comparison-table table {
    width: 100%;
    border-collapse: collapse;
}

.comparison-table th,
.comparison-table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.comparison-table th {
    background: var(--color-bg);
    font-weight: 600;
    position: sticky;
    top: 0;
}

.comparison-table .highlight {
    background: var(--color-primary-light);
    font-weight: 600;
    color: var(--color-primary-dark);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: var(--color-text);
    color: white;
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.footer-desc {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9375rem;
}

.footer-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
    font-size: 0.9375rem;
}

.footer-links a:hover {
    color: white;
}

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

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.875rem;
}

/* ========================================
   Modal
   ======================================== */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    animation: fadeIn 0.2s ease;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    max-width: 900px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    animation: slideUp 0.3s ease;
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--color-text-secondary);
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--color-text);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

/* ========================================
   Animations
   ======================================== */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.loading {
    animation: pulse 1.5s ease-in-out infinite;
}

/* ========================================
   Utilities
   ======================================== */
.hidden {
    display: none !important;
}

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

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }