/**
 * FormatVPN Styles
 * @description Main stylesheet with CSS custom properties
 * @version 2.0.0
 */

/* ============================================
   CSS Custom Properties (Design Tokens)
   ============================================ */

:root {
    /* Colors - Brand */
    --color-primary: #6366f1;
    --color-primary-light: #818cf8;
    --color-primary-dark: #4f46e5;
    --color-primary-alpha: rgba(99, 102, 241, 0.1);
    
    /* Colors - Accent */
    --color-accent: #06b6d4;
    --color-accent-light: #22d3ee;
    --color-accent-dark: #0891b2;
    
    /* Colors - Semantic */
    --color-success: #10b981;
    --color-success-light: #34d399;
    --color-warning: #f59e0b;
    --color-warning-light: #fbbf24;
    --color-error: #ef4444;
    --color-error-light: #f87171;
    --color-info: #3b82f6;
    
    /* Colors - Neutral */
    --color-white: #ffffff;
    --color-black: #000000;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    --color-gray-950: #030712;
    
    /* Dark theme colors */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a24;
    --bg-card: #16161f;
    --bg-card-hover: #1e1e2a;
    --bg-input: #1a1a24;
    
    --text-primary: #f9fafb;
    --text-secondary: #9ca3af;
    --text-tertiary: #6b7280;
    --text-muted: #4b5563;
    
    --border-color: rgba(255, 255, 255, 0.08);
    --border-color-light: rgba(255, 255, 255, 0.12);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    --gradient-dark: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    --gradient-card: linear-gradient(145deg, var(--bg-card) 0%, var(--bg-tertiary) 100%);
    --gradient-glow: radial-gradient(ellipse at center, var(--color-primary-alpha) 0%, transparent 70%);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-family-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;
    --spacing-24: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);
    --shadow-glow-lg: 0 0 60px rgba(99, 102, 241, 0.4);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
    
    /* Z-index */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-toast: 600;
    
    /* Layout */
    --header-height: 72px;
    --container-max: 1200px;
    --container-padding: var(--spacing-4);
}

/* ============================================
   Base Styles
   ============================================ */

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body.menu-open {
    overflow: hidden;
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--text-primary);
}

h1 {
    font-size: clamp(var(--font-size-3xl), 5vw, var(--font-size-5xl));
}

h2 {
    font-size: clamp(var(--font-size-2xl), 4vw, var(--font-size-4xl));
}

h3 {
    font-size: var(--font-size-xl);
}

h4 {
    font-size: var(--font-size-lg);
}

p {
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
}

a {
    color: var(--color-primary-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* ============================================
   Layout
   ============================================ */

.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section {
    padding: var(--spacing-20) 0;
}

@media (max-width: 768px) {
    .section {
        padding: var(--spacing-12) 0;
    }
}

/* ============================================
   Header
   ============================================ */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    z-index: var(--z-fixed);
    transition: all var(--transition-base);
}

.header.scrolled {
    background: rgba(10, 10, 15, 0.95);
    border-bottom-color: var(--border-color);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon svg {
    width: 24px;
    height: 24px;
    stroke: white;
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.nav-links {
    display: flex;
    gap: var(--spacing-6);
}

.nav-link {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-fast);
}

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

.nav-link:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* Dashboard button in navigation */
.btn-dashboard {
    display: inline-flex;
}

.btn-dashboard .dashboard-btn-text {
    display: inline;
}

@media (max-width: 1024px) {
    .btn-dashboard .dashboard-btn-text {
        display: none;
    }
    
    .btn-dashboard {
        padding: var(--spacing-2);
    }
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--spacing-2);
    background: none;
    border: none;
    cursor: pointer;
}

.menu-toggle:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

@media (max-width: 768px) {
    .nav:not(.dashboard-nav):not(.simple-nav) {
        display: none;
    }

    .menu-toggle {
        display: flex;
    }
}

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    padding: var(--spacing-6);
    z-index: var(--z-fixed);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base);
    display: none;
}

@media (max-width: 768px) {
    .mobile-menu {
        display: flex;
        flex-direction: column;
    }
}

.mobile-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.mobile-menu .nav-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
}

.mobile-menu .nav-link {
    font-size: var(--font-size-lg);
    padding: var(--spacing-3) 0;
}

/* Button styled as nav-link in mobile menu */
.mobile-menu .nav-link-btn {
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--font-family);
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    padding: var(--spacing-3) 0;
}

.mobile-menu .nav-link-btn:hover {
    color: var(--text-primary);
}

.mobile-menu .nav-link-btn:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* CTA button in mobile menu */
.mobile-menu > .btn {
    margin-top: auto;
    width: 100%;
}

/* ============================================
   Buttons
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-6);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    line-height: 1;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

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

.btn:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-card-hover);
    border-color: var(--border-color-light);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}

.btn-ghost:hover:not(:disabled) {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-sm {
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-xs);
}

.btn-lg {
    padding: var(--spacing-4) var(--spacing-8);
    font-size: var(--font-size-base);
}

.btn-icon {
    padding: var(--spacing-2);
    width: 40px;
    height: 40px;
}

.btn-icon svg {
    width: 20px;
    height: 20px;
}

.btn-glow {
    animation: glow-pulse 2s ease-in-out infinite;
}

@keyframes glow-pulse {
    0%, 100% {
        box-shadow: var(--shadow-md);
    }
    50% {
        box-shadow: var(--shadow-glow-lg);
    }
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: var(--header-height);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 150%;
    height: 100%;
    background: var(--gradient-glow);
    opacity: 0.5;
    pointer-events: none;
}

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-4);
    background: var(--color-primary-alpha);
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    color: var(--color-primary-light);
    margin-bottom: var(--spacing-6);
}

.hero-badge svg {
    width: 16px;
    height: 16px;
}

.hero-title {
    margin-bottom: var(--spacing-6);
}

.hero-title .gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    -webkit-text-fill-color: transparent;
}

.hero-description {
    font-size: var(--font-size-lg);
    max-width: 600px;
    margin: 0 auto var(--spacing-8);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-4);
    justify-content: center;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-12);
    margin-top: var(--spacing-16);
}

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

.stat-number {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    margin-top: var(--spacing-1);
}

@media (max-width: 768px) {
    .hero-stats {
        gap: var(--spacing-6);
    }
    
    .stat-number {
        font-size: var(--font-size-2xl);
    }
}

/* ============================================
   Features Section
   ============================================ */

.features {
    background: var(--bg-secondary);
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--spacing-12);
}

.section-header h2 {
    margin-bottom: var(--spacing-4);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-6);
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-8);
    transition: all var(--transition-base);
}

.feature-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-color-light);
    transform: translateY(-4px);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: var(--color-primary-alpha);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-6);
}

.feature-icon svg {
    width: 28px;
    height: 28px;
    stroke: var(--color-primary-light);
}

.feature-card h3 {
    margin-bottom: var(--spacing-3);
}

.feature-card p {
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    color: var(--text-secondary);
}

/* ============================================
   Tariffs Section
   ============================================ */

.tariffs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-6);
    max-width: 1100px;
    margin: 0 auto;
}

.tariff-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-8);
    position: relative;
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
}

.tariff-card:hover {
    border-color: var(--color-primary-light);
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg), 0 0 40px rgba(99, 102, 241, 0.1);
}

.tariff-card.popular {
    border: 2px solid transparent;
    background: linear-gradient(var(--bg-card), var(--bg-card)) padding-box,
                var(--gradient-primary) border-box;
    transform: scale(1.02);
    z-index: 1;
}

.tariff-card.popular:hover {
    transform: scale(1.02) translateY(-6px);
}

/* Trial tariff special styling */
.tariff-card.trial {
    border-color: var(--color-success);
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.05) 0%, transparent 100%);
}

.tariff-card.trial:hover {
    border-color: var(--color-success);
    box-shadow: var(--shadow-lg), 0 0 40px rgba(16, 185, 129, 0.15);
}

/* Whitelist/bypass tariff styling */
.tariff-card.whitelist {
    border-color: var(--color-warning);
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.05) 0%, transparent 100%);
}

.tariff-card.whitelist:hover {
    border-color: var(--color-warning);
    box-shadow: var(--shadow-lg), 0 0 40px rgba(245, 158, 11, 0.15);
}

.tariff-badge {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-primary);
    color: var(--color-white);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    padding: var(--spacing-2) var(--spacing-5);
    border-radius: var(--radius-full);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.tariff-badge.trial-badge {
    background: var(--color-success);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}

.tariff-badge.whitelist-badge {
    background: linear-gradient(135deg, var(--color-warning), #d97706);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
}

.tariff-discount {
    position: absolute;
    top: var(--spacing-4);
    right: var(--spacing-4);
    background: linear-gradient(135deg, var(--color-success), #059669);
    color: var(--color-white);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: var(--radius-md);
    box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
}

.tariff-header {
    text-align: center;
    margin-bottom: var(--spacing-6);
}

.tariff-name {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-2);
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    line-height: 1.3;
    word-wrap: break-word;
    hyphens: auto;
}

.tariff-card.popular .tariff-name {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    -webkit-text-fill-color: transparent;
}

.tariff-duration {
    color: var(--text-tertiary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

.tariff-price {
    text-align: center;
    margin-bottom: var(--spacing-2);
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: var(--spacing-1);
}

.price-amount {
    font-size: 3rem;
    font-weight: var(--font-weight-bold);
    line-height: 1;
    background: linear-gradient(135deg, var(--text-primary), var(--color-primary-light));
    -webkit-background-clip: text;
    background-clip: text;
}

.tariff-card.trial .price-amount {
    background: linear-gradient(135deg, var(--color-success), #059669);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    -webkit-text-fill-color: transparent;
}

.price-currency {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--text-secondary);
}

.tariff-per-month {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-6);
    padding: var(--spacing-2) var(--spacing-4);
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    display: inline-block;
    margin-left: auto;
    margin-right: auto;
}

.tariff-card .tariff-per-month-wrapper {
    text-align: center;
    margin-bottom: var(--spacing-6);
}

.tariff-features {
    list-style: none;
    margin-bottom: var(--spacing-8);
    flex-grow: 1;
}

.tariff-features li {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-3) 0;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    border-bottom: 1px solid var(--border-color);
}

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

.tariff-features svg {
    width: 20px;
    height: 20px;
    stroke: var(--color-success);
    flex-shrink: 0;
    stroke-width: 2.5;
}

.tariff-btn {
    width: 100%;
    padding: var(--spacing-4) var(--spacing-6);
    font-size: var(--font-size-base);
}

.tariff-card.popular .tariff-btn {
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

.tariff-card.trial .tariff-btn {
    background: var(--color-success);
    box-shadow: 0 4px 20px rgba(16, 185, 129, 0.4);
}

.tariff-card.trial .tariff-btn:hover {
    background: #059669;
}

.tariff-card.whitelist .tariff-btn {
    background: linear-gradient(135deg, var(--color-warning), #d97706);
    box-shadow: 0 4px 20px rgba(245, 158, 11, 0.4);
}

.tariff-card.whitelist .tariff-btn:hover {
    background: #d97706;
}

.tariff-card.whitelist .price-amount {
    background: linear-gradient(135deg, var(--color-warning), #d97706);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    -webkit-text-fill-color: transparent;
}

/* ============================================
   FAQ Section
   ============================================ */

.faq {
    background: var(--bg-secondary);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--border-color);
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: var(--spacing-6) 0;
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
    color: var(--text-primary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-fast);
}

.faq-question:hover {
    color: var(--color-primary-light);
}

.faq-question:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

.faq-question svg {
    width: 24px;
    height: 24px;
    stroke: var(--text-tertiary);
    transition: transform var(--transition-base);
    flex-shrink: 0;
}

.faq-item.active .faq-question svg {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.faq-answer p {
    padding-bottom: var(--spacing-6);
}

/* ============================================
   Footer
   ============================================ */

.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-12) 0 var(--spacing-8);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-6);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.footer-links {
    display: flex;
    gap: var(--spacing-6);
}

.footer-link {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.footer-link:hover {
    color: var(--text-primary);
}

.footer-link:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

.footer-bottom {
    margin-top: var(--spacing-8);
    padding-top: var(--spacing-6);
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-tertiary);
    font-size: var(--font-size-sm);
}

/* ============================================
   Modal
   ============================================ */

.modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-4);
    z-index: var(--z-modal);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-8);
    max-width: 400px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.95);
    transition: transform var(--transition-base);
}

.modal.active .modal-content {
    transform: scale(1);
}

.modal-close {
    position: absolute;
    top: var(--spacing-4);
    right: var(--spacing-4);
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: var(--spacing-2);
    transition: color var(--transition-fast);
}

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

.modal-close:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

.modal-close svg {
    width: 24px;
    height: 24px;
}

.modal-content h3 {
    text-align: center;
    margin-bottom: var(--spacing-6);
}

/* Auth Modal */
.auth-modal .telegram-login {
    display: flex;
    justify-content: center;
    min-height: 60px;
}

.auth-modal .auth-hint {
    text-align: center;
    margin-top: var(--spacing-4);
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

/* QR Modal */
.qr-modal-content {
    max-width: 380px;
    text-align: center;
}

.qr-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 280px;
    padding: var(--spacing-4);
    background: var(--color-white);
    border-radius: var(--radius-xl);
    margin: var(--spacing-4) 0;
    position: relative;
}

.qr-container .qr-canvas,
.qr-container .qr-image {
    display: block;
    max-width: 280px;
    height: auto;
    border-radius: var(--radius-md);
}

.qr-loading {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 280px;
}

.qr-error-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-3);
    color: var(--text-tertiary);
    padding: var(--spacing-6);
}

.qr-error-state svg {
    stroke: var(--color-warning);
}

.qr-error-state p {
    margin: 0;
    font-size: var(--font-size-sm);
}

.qr-error-hint {
    color: var(--text-muted);
}

.qr-hint {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-4);
}

.btn-full {
    width: 100%;
}

/* ============================================
   Toast Notifications
   ============================================ */

.toast-container {
    position: fixed;
    bottom: var(--spacing-6);
    right: var(--spacing-6);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
    z-index: var(--z-toast);
    pointer-events: none;
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-4) var(--spacing-5);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    pointer-events: auto;
    transform: translateX(100%);
    opacity: 0;
    transition: all var(--transition-base);
}

.toast.show {
    transform: translateX(0);
    opacity: 1;
}

.toast-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.toast-success .toast-icon {
    stroke: var(--color-success);
}

.toast-error .toast-icon {
    stroke: var(--color-error);
}

.toast-warning .toast-icon {
    stroke: var(--color-warning);
}

.toast-info .toast-icon {
    stroke: var(--color-info);
}

.toast-message {
    font-size: var(--font-size-sm);
    color: var(--text-primary);
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: var(--spacing-1);
    margin-left: auto;
    transition: color var(--transition-fast);
}

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

.toast-close:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

.toast-close svg {
    width: 16px;
    height: 16px;
}

@media (max-width: 768px) {
    .toast-container {
        left: var(--spacing-4);
        right: var(--spacing-4);
        bottom: var(--spacing-4);
    }
}

/* ============================================
   Loading States
   ============================================ */

.skeleton {
    position: relative;
    overflow: hidden;
}

.skeleton::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, 
        transparent, 
        rgba(255, 255, 255, 0.05), 
        transparent
    );
    animation: skeleton-shimmer 1.5s infinite;
}

@keyframes skeleton-shimmer {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(100%);
    }
}

.skeleton-line {
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    height: 16px;
    margin-bottom: var(--spacing-3);
}

.skeleton-title {
    width: 60%;
    height: 24px;
}

.skeleton-price {
    width: 40%;
    height: 40px;
    margin: var(--spacing-6) auto;
}

.skeleton-btn {
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    height: 48px;
    margin-top: var(--spacing-6);
}

/* Empty & Error States */
.empty-state,
.error-state {
    text-align: center;
    padding: var(--spacing-12);
    color: var(--text-secondary);
}

.empty-state svg,
.error-state svg {
    width: 64px;
    height: 64px;
    margin-bottom: var(--spacing-4);
    stroke: var(--text-tertiary);
}

.empty-state h3,
.error-state h3 {
    margin-bottom: var(--spacing-2);
}

.empty-state p,
.error-state p {
    margin-bottom: var(--spacing-6);
}

.empty-state.small {
    padding: var(--spacing-6);
}

.empty-state.small svg {
    width: 40px;
    height: 40px;
}

/* ============================================
   Animations
   ============================================ */

.animate-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.animate-on-scroll.animate-in {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger children */
.animate-on-scroll:nth-child(1) { transition-delay: 0ms; }
.animate-on-scroll:nth-child(2) { transition-delay: 100ms; }
.animate-on-scroll:nth-child(3) { transition-delay: 200ms; }
.animate-on-scroll:nth-child(4) { transition-delay: 300ms; }
.animate-on-scroll:nth-child(5) { transition-delay: 400ms; }

/* Floating animation */
@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.float {
    animation: float 3s ease-in-out infinite;
}

/* ============================================
   Utility Classes
   ============================================ */

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

.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }

.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }

.hidden { display: none !important; }
.visible { visibility: visible; }
.invisible { visibility: hidden; }

.flex { display: flex; }
.inline-flex { display: inline-flex; }
.grid { display: grid; }

.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }

.gap-2 { gap: var(--spacing-2); }
.gap-4 { gap: var(--spacing-4); }
.gap-6 { gap: var(--spacing-6); }

.mt-4 { margin-top: var(--spacing-4); }
.mt-6 { margin-top: var(--spacing-6); }
.mb-4 { margin-bottom: var(--spacing-4); }
.mb-6 { margin-bottom: var(--spacing-6); }

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 1024px) {
    :root {
        --container-padding: var(--spacing-6);
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 64px;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .hero-actions .btn {
        width: 100%;
        max-width: 300px;
    }

    .tariffs-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        justify-content: center;
        flex-wrap: wrap;
        gap: var(--spacing-4);
    }
    
    /* Larger touch targets on mobile */
    .btn {
        min-height: 44px;
        padding: var(--spacing-3) var(--spacing-5);
    }
    
    .faq-question {
        padding: var(--spacing-5) 0;
        min-height: 48px;
    }
    
    .nav-link {
        padding: var(--spacing-3);
    }
}

@media (max-width: 480px) {
    :root {
        --container-padding: var(--spacing-4);
    }

    .hero {
        min-height: auto;
        padding-top: calc(var(--header-height) + var(--spacing-12));
        padding-bottom: var(--spacing-12);
    }
    
    /* Stack footer links vertically */
    .footer-links {
        flex-direction: column;
        gap: var(--spacing-3);
    }
    
    /* Full-width modals */
    .modal-content {
        max-width: 100%;
        margin: 0 var(--spacing-2);
        border-radius: var(--radius-xl);
    }
}

/* ============================================
   Touch Devices
   ============================================ */

@media (hover: none) and (pointer: coarse) {
    /* Remove hover effects on touch devices */
    .feature-card:hover,
    .tariff-card:hover {
        transform: none;
    }
    
    /* Ensure adequate tap target size */
    .btn,
    .nav-link,
    .faq-question,
    .footer-link {
        min-height: 44px;
    }
    
    /* Add active state instead of hover */
    .btn:active {
        transform: scale(0.98);
    }
    
    .feature-card:active,
    .tariff-card:active {
        background: var(--bg-card-hover);
    }
}

/* ============================================
   Print Styles
   ============================================ */


@media print {
    .header,
    .footer,
    .modal,
    .toast-container {
        display: none !important;
    }

    body {
        background: white;
        color: black;
    }

    .section {
        padding: 1rem 0;
    }
}

/* ============================================
   Reduced Motion
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .animate-on-scroll {
        opacity: 1;
        transform: none;
    }
}

/* ============================================
   High Contrast Mode
   ============================================ */

@media (prefers-contrast: high) {
    :root {
        --border-color: rgba(255, 255, 255, 0.3);
        --border-color-light: rgba(255, 255, 255, 0.5);
    }
    
    .btn {
        border: 2px solid currentColor;
    }
    
    .tariff-card,
    .feature-card,
    .faq-item {
        border-width: 2px;
    }
}

/* ============================================
   Selection & Scrollbar
   ============================================ */

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

::-moz-selection {
    background: var(--color-primary);
    color: var(--color-white);
}

/* Custom scrollbar for Webkit browsers */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color-light);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* Firefox scrollbar */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--border-color-light) var(--bg-secondary);
}

/* ============================================
   Safe Area (notch devices)
   ============================================ */

@supports (padding: env(safe-area-inset-bottom)) {
    .footer {
        padding-bottom: calc(var(--spacing-8) + env(safe-area-inset-bottom));
    }
    
    .toast-container {
        bottom: calc(var(--spacing-6) + env(safe-area-inset-bottom));
    }
    
    .modal-content {
        padding-bottom: calc(var(--spacing-8) + env(safe-area-inset-bottom));
    }
}

/* ============================================
   Legal Pages (Privacy, Terms, Offer)
   ============================================ */

.legal-content {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-8) var(--container-padding);
}

.legal-content h1 {
    font-size: clamp(var(--font-size-2xl), 4vw, var(--font-size-4xl));
    margin-bottom: var(--spacing-2);
}

.legal-content .date {
    color: var(--text-tertiary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-8);
}

.legal-content h2 {
    font-size: var(--font-size-xl);
    margin-top: var(--spacing-10);
    margin-bottom: var(--spacing-4);
    color: var(--text-primary);
    padding-bottom: var(--spacing-2);
    border-bottom: 1px solid var(--border-color);
}

.legal-content h3 {
    font-size: var(--font-size-lg);
    margin-top: var(--spacing-6);
    margin-bottom: var(--spacing-3);
    color: var(--text-primary);
}

.legal-content p,
.legal-content li {
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-4);
}

.legal-content ul,
.legal-content ol {
    padding-left: var(--spacing-6);
    margin-bottom: var(--spacing-4);
}

.legal-content li {
    margin-bottom: var(--spacing-2);
}

.legal-content strong {
    color: var(--text-primary);
    font-weight: var(--font-weight-semibold);
}

.legal-content a {
    color: var(--color-primary-light);
    text-decoration: underline;
    text-underline-offset: 2px;
}

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

.legal-content a:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* Info/Warning/Success boxes */
.legal-content .info {
    background: var(--color-primary-alpha);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--spacing-4) var(--spacing-5);
    margin: var(--spacing-6) 0;
}

.legal-content .info strong {
    color: var(--color-primary-light);
}

.legal-content .success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--spacing-4) var(--spacing-5);
    margin: var(--spacing-6) 0;
}

.legal-content .success strong {
    color: var(--color-success);
}

.legal-content .warning {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--spacing-4) var(--spacing-5);
    margin: var(--spacing-6) 0;
}

.legal-content .warning strong {
    color: var(--color-error);
}

/* Tables in legal content */
.legal-content table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-4) 0;
    font-size: var(--font-size-sm);
}

.legal-content table th,
.legal-content table td {
    border: 1px solid var(--border-color);
    padding: var(--spacing-3) var(--spacing-4);
    text-align: left;
}

.legal-content table th {
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-weight: var(--font-weight-semibold);
}

.legal-content table td {
    color: var(--text-secondary);
}

/* Footer links in legal pages */
.footer-legal-links {
    display: flex;
    gap: var(--spacing-4);
    flex-wrap: wrap;
    justify-content: center;
    margin-top: var(--spacing-2);
}

.footer-legal-links a {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

.footer-legal-links a:hover {
    color: var(--text-primary);
}

.footer-legal-links a:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

.footer-legal-links a[aria-current="page"] {
    color: var(--color-primary-light);
}

@media (max-width: 768px) {
    .legal-content {
        padding: var(--spacing-6) var(--spacing-4);
    }
    
    .legal-content h2 {
        margin-top: var(--spacing-8);
    }
    
    .legal-content table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .footer-legal-links {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-2);
    }
}