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

:root {
    --primary: #2196F3;
    --primary-dark: #1976D2;
    --primary-light: #64B5F6;
    --secondary: #03A9F4;
    --success: #4CAF50;
    --danger: #F44336;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --white: #ffffff;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --radius: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-900);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--gray-900);
}

.logo-img {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--gray-700);
    transition: all 0.3s;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    box-shadow: 0 4px 12px rgba(33, 150, 243, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(33, 150, 243, 0.4);
}

.btn-secondary {
    background: var(--white);
    color: var(--primary);
    border: 2px solid var(--primary);
}

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

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

.btn-large {
    padding: 16px 32px;
    font-size: 18px;
}

.btn-block {
    width: 100%;
}

.hero {
    padding: 140px 0 80px;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(33, 150, 243, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(3, 169, 244, 0.08) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-text {
    max-width: 600px;
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    color: var(--gray-900);
}

.hero-title .highlight {
    color: var(--primary);
    position: relative;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--gray-600);
    margin-bottom: 32px;
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 40px;
}

.hero-features {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
}

.feature-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--gray-700);
    font-size: 14px;
    font-weight: 500;
}

.feature-badge svg {
    color: var(--success);
    flex-shrink: 0;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-card {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border-radius: var(--radius-xl);
    padding: 32px;
    color: var(--white);
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 400px;
    position: relative;
    overflow: hidden;
}

.hero-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.card-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 32px;
    position: relative;
    z-index: 1;
}

.card-icon {
    font-size: 48px;
}

.card-info {
    flex: 1;
}

.card-name {
    font-size: 18px;
    font-weight: 600;
    opacity: 0.9;
    margin-bottom: 4px;
}

.card-balance {
    font-size: 32px;
    font-weight: 700;
}

.card-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    position: relative;
    z-index: 1;
}

.stat {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border-radius: var(--radius);
    padding: 16px;
}

.stat-label {
    font-size: 12px;
    opacity: 0.8;
    margin-bottom: 8px;
}

.stat-value {
    font-size: 20px;
    font-weight: 700;
}

.stat-value.positive {
    color: #4ade80;
}

.stat-value.negative {
    color: #f87171;
}

.about {
    padding: 80px 0;
    background: var(--white);
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}

.section-title {
    font-size: 42px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--gray-600);
    line-height: 1.6;
}

.about-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 32px;
}

.about-card {
    text-align: center;
    padding: 32px;
    background: var(--gray-50);
    border-radius: var(--radius-lg);
    transition: all 0.3s;
}

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

.about-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.about-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.about-card p {
    color: var(--gray-600);
    line-height: 1.6;
}

.features {
    padding: 80px 0;
    background: var(--gray-50);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.feature-item {
    background: var(--white);
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.feature-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.feature-item h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.feature-item p {
    color: var(--gray-600);
    line-height: 1.6;
}

.pricing {
    padding: 80px 0;
    background: var(--white);
}

.internet-notice {
    display: flex;
    align-items: center;
    gap: 16px;
    max-width: 800px;
    margin: 0 auto 40px;
    padding: 20px 24px;
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
    border-left: 4px solid var(--primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.notice-icon {
    font-size: 32px;
    flex-shrink: 0;
}

.notice-text {
    flex: 1;
    color: var(--gray-700);
    line-height: 1.6;
}

.notice-text strong {
    color: var(--primary-dark);
    font-weight: 600;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    max-width: 1000px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-xl);
    padding: 40px 32px;
    position: relative;
    transition: all 0.3s;
}

.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary);
}

.pricing-card.featured {
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
    transform: scale(1.05);
}

.pricing-card.featured:hover {
    transform: scale(1.05) translateY(-8px);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: 6px 20px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.pricing-header {
    text-align: center;
    margin-bottom: 32px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--gray-200);
}

.pricing-name {
    font-size: 24px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 16px;
}

.pricing-price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
}

.price-amount {
    font-size: 48px;
    font-weight: 800;
    color: var(--primary);
}

.price-period {
    font-size: 18px;
    color: var(--gray-600);
}

.pricing-features {
    list-style: none;
    margin-bottom: 32px;
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 0;
    color: var(--gray-700);
}

.pricing-features li svg {
    color: var(--success);
    flex-shrink: 0;
}

.pricing-features li.feature-ad svg {
    color: var(--gray-400);
}

.pricing-features li.feature-ad {
    color: var(--gray-500);
}

.footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: 60px 0 24px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-logo .logo-img {
    width: 36px;
    height: 36px;
}

.footer-logo .logo-text {
    font-size: 18px;
    color: var(--white);
}

.footer-description {
    color: var(--gray-400);
    line-height: 1.6;
}

.footer-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 16px;
}

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

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: var(--gray-400);
    text-decoration: none;
    transition: color 0.2s;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid var(--gray-800);
    color: var(--gray-500);
}

@media (max-width: 968px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-title {
        font-size: 42px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .hero-actions {
        flex-direction: column;
    }

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

    .pricing-card.featured {
        transform: scale(1);
    }

    .pricing-card.featured:hover {
        transform: translateY(-8px);
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 73px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 24px;
        border-bottom: 1px solid var(--gray-200);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s;
    }

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

    .mobile-menu-toggle {
        display: flex;
    }

    .mobile-menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }

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

    .mobile-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }

    .hero {
        padding: 120px 0 60px;
    }

    .hero-title {
        font-size: 36px;
    }

    .section-title {
        font-size: 32px;
    }

    .internet-notice {
        flex-direction: column;
        text-align: center;
        padding: 16px 20px;
    }

    .notice-icon {
        font-size: 28px;
    }

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

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero-title {
        font-size: 28px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .section-title {
        font-size: 28px;
    }

    .about-content,
    .features-grid {
        grid-template-columns: 1fr;
    }

    .internet-notice {
        padding: 14px 16px;
    }

    .notice-text {
        font-size: 14px;
    }
}