:root {
    /* Colors */
    --primary-color: #000000;
    --secondary-color: #1a1a1a;
    --text-color: #111111;
    --light-text: #555555;
    --background: #ffffff;
    --card-bg: #ffffff;
    --hover-bg: #fafafa;
    --border-color: rgba(0, 0, 0, 0.06);
    
    /* Shadows */
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.02);
    --hover-shadow: 0 8px 30px rgba(0, 0, 0, 0.05);
    
    /* Animation */
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Spacing */
    --spacing-unit: clamp(1rem, 2vw, 1.25rem);
    
    /* Typography */
    --h1-size: clamp(1.75rem, 4vw, 2.25rem);
    --h2-size: clamp(1.25rem, 2vw, 1.5rem);
    --body-size: 0.9375rem;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Inter', Arial, sans-serif;
    line-height: 1.5;
    color: var(--text-color);
    background-color: var(--background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: calc(var(--spacing-unit) * 3) var(--spacing-unit);
}

/* Typography */
h1 {
    font-size: var(--h1-size);
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text-color);
    margin-bottom: calc(var(--spacing-unit) * 0.75);
}

.subtitle {
    font-size: var(--body-size);
    color: var(--light-text);
    max-width: 460px;
    margin: 0 auto;
    letter-spacing: -0.01em;
}

/* Header */
header {
    text-align: center;
    margin-bottom: calc(var(--spacing-unit) * 4);
}

/* Domain Cards */
.domain-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: calc(var(--spacing-unit) * 1.5);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border-color);
    position: relative;
    display: flex;
    flex-direction: column;
    min-height: 220px;
    box-shadow: var(--shadow);
}

.domain-card:hover {
    box-shadow: var(--hover-shadow);
    transform: translateY(-1px);
}

.domain-card.primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    transform: scale(1.01);
    min-height: 260px;
    border: none;
    padding: calc(var(--spacing-unit) * 2);
}

.domain-card h2, .domain-card h3 {
    font-size: var(--h2-size);
    margin-bottom: calc(var(--spacing-unit) * 0.5);
    transition: var(--transition);
    cursor: pointer;
    letter-spacing: -0.01em;
    font-weight: 600;
}

.domain-description {
    color: var(--light-text);
    margin: var(--spacing-unit) 0;
    font-size: var(--body-size);
    line-height: 1.5;
    flex-grow: 1;
}

.domain-card.primary .domain-description {
    color: rgba(255, 255, 255, 0.9);
}

/* Grid Layout */
.domain-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: calc(var(--spacing-unit) * 1.25);
    margin-top: calc(var(--spacing-unit) * 2);
}

/* Buttons */
.cta-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: var(--background);
    color: var(--primary-color);
    padding: 0.75rem 1.25rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    border: 1px solid var(--border-color);
    width: 100%;
    margin-top: auto;
    font-size: var(--body-size);
}

.domain-card.primary .cta-button {
    background: transparent;
    color: white;
    border-color: rgba(255, 255, 255, 0.15);
    padding: 0.875rem 1.5rem;
}

.cta-button:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-1px);
    border-color: var(--primary-color);
}

.domain-card.primary .cta-button:hover {
    background: white;
    color: var(--primary-color);
    border-color: white;
}

/* Footer */
footer {
    text-align: center;
    margin-top: calc(var(--spacing-unit) * 5);
    padding-top: calc(var(--spacing-unit) * 2);
    border-top: 1px solid var(--border-color);
    font-size: var(--body-size);
    color: var(--light-text);
}

.social-links {
    margin: calc(var(--spacing-unit) * 1.25) 0;
}

.social-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-color);
    text-decoration: none;
    padding: 0.625rem 1rem;
    border-radius: 6px;
    transition: var(--transition);
    font-weight: 500;
    font-size: var(--body-size);
}

.social-link:hover {
    background: var(--hover-bg);
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-color);
    color: white;
    padding: 0.625rem 1.25rem;
    border-radius: 99px;
    font-size: calc(var(--body-size) * 0.9375);
    opacity: 0;
    transition: var(--transition);
    z-index: 1000;
    box-shadow: var(--hover-shadow);
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(-10px);
}

/* Section Headers */
.more-domains {
    margin-top: calc(var(--spacing-unit) * 4);
}

.more-domains h2 {
    text-align: center;
    margin-bottom: calc(var(--spacing-unit) * 2);
    font-size: var(--h2-size);
    color: var(--text-color);
    font-weight: 600;
    letter-spacing: -0.01em;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .container {
        max-width: 90%;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-unit: 1rem;
    }
    
    .domain-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-unit);
    }

    .domain-card {
        min-height: 200px;
    }

    .domain-card.primary {
        min-height: 240px;
    }
    
    .more-domains {
        margin-top: calc(var(--spacing-unit) * 3);
    }
}

@media (max-width: 480px) {
    .container {
        padding: var(--spacing-unit);
    }
    
    .domain-card,
    .domain-card.primary {
        padding: calc(var(--spacing-unit) * 1.25);
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}

@media (hover: none) {
    .domain-card:hover,
    .cta-button:hover {
        transform: none;
    }
}

.ad-section {
    margin: calc(var(--spacing-unit) * 2) auto calc(var(--spacing-unit) * 4);
    max-width: 100%;
    text-align: center;
}

.ad-section h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--light-text);
}

.ad-space {
    background: var(--card-bg);
    border-radius: 1rem;
    padding: 3rem;
    border: 2px dashed var(--border-color);
}

.ad-link {
    display: block;
    transition: var(--transition);
}

.ad-link:hover {
    transform: translateY(-2px);
}

.ad-image {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

@media (max-width: 768px) {
    .ad-section {
        margin: var(--spacing-unit) auto calc(var(--spacing-unit) * 3);
    }
}

/* Highlight Text */
.highlight {
    color: var(--primary-color);
    background: linear-gradient(120deg, rgba(255, 255, 0, 0.15) 0%, rgba(255, 255, 0, 0.15) 100%);
    padding: 0.2em 0.4em;
    border-radius: 4px;
}

/* Promo Code Styles */
.promo-text {
    margin-top: 1rem;
    font-size: var(--body-size);
    color: var(--light-text);
}

.promo-text strong {
    color: var(--primary-color);
    background: var(--hover-bg);
    padding: 0.3em 0.6em;
    border-radius: 4px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.ad-section h3 {
    color: var(--primary-color);
    font-size: var(--h2-size);
    margin-bottom: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}