/* ===================================
   CSS Custom Properties (Design Tokens)
   =================================== */
:root {
    /* Colors - Material Design */
    --color-primary: #1976d2;
    --color-primary-dark: #1565c0;
    --color-primary-light: #42a5f5;
    --color-text-primary: #212121;
    --color-text-secondary: #757575;
    --color-text-hint: #9e9e9e;
    --color-background: #ffffff;
    --color-surface: #ffffff;
    --color-divider: #e0e0e0;

    /* Shadows - Material Design Elevation */
    --shadow-1: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    --shadow-2: 0 3px 6px rgba(0, 0, 0, 0.15), 0 2px 4px rgba(0, 0, 0, 0.12);
    --shadow-3: 0 10px 20px rgba(0, 0, 0, 0.15), 0 3px 6px rgba(0, 0, 0, 0.10);
    --shadow-4: 0 15px 25px rgba(0, 0, 0, 0.15), 0 5px 10px rgba(0, 0, 0, 0.05);

    /* Spacing - 8px grid system */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-xxl: 64px;

    /* Typography */
    --font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --font-size-sm: 14px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-xxl: 36px;
    --font-size-hero: 48px;

    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 700;

    --line-height-tight: 1.2;
    --line-height-base: 1.5;
    --line-height-relaxed: 1.75;

    /* Transitions */
    --transition-base: 0.3s ease;
    --transition-fast: 0.15s ease;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

/* ===================================
   CSS Reset and Base Styles
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: var(--font-size-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-weight: var(--font-weight-regular);
    line-height: var(--line-height-base);
    color: var(--color-text-primary);
    background-color: var(--color-background);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===================================
   Typography
   =================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: var(--font-size-hero);
    letter-spacing: -0.02em;
}

h2 {
    font-size: var(--font-size-xl);
}

p {
    margin-bottom: var(--spacing-sm);
}

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

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

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

/* ===================================
   Layout Components
   =================================== */
main {
    flex: 1;
    display: flex;
    flex-direction: column;
    width: 100%;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    text-align: center;
    padding: var(--spacing-xxl) var(--spacing-sm);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.hero h1 {
    margin-bottom: var(--spacing-sm);
    color: white;
    font-size: var(--font-size-hero);
}

.hero .tagline {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-regular);
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: 0;
    line-height: var(--line-height-relaxed);
}

/* ===================================
   Destinations Section
   =================================== */
.destinations {
    padding: var(--spacing-xxl) var(--spacing-sm);
    background-color: #f5f5f5;
    flex: 1;
}

.destinations .container {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    max-width: 1200px;
}

/* ===================================
   Card Component
   =================================== */
.card {
    background-color: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-2);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

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

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

.card-icon {
    width: 48px;
    height: 48px;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-icon svg {
    width: 32px;
    height: 32px;
}

.card-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.card-description {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-md);
    flex: 1;
}

.card-link {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-primary);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: gap var(--transition-base);
    align-self: flex-start;
}

.card-link:hover {
    gap: var(--spacing-sm);
}

.card-link .arrow {
    transition: transform var(--transition-base);
    font-size: var(--font-size-lg);
    line-height: 1;
}

.card:hover .card-link .arrow {
    transform: translateX(4px);
}

/* ===================================
   Footer
   =================================== */
footer {
    background-color: var(--color-text-primary);
    color: white;
    padding: var(--spacing-lg) var(--spacing-sm);
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: white;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transition: background-color var(--transition-base), transform var(--transition-fast);
}

.social-links a:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
}

.social-links a:focus {
    outline: 2px solid white;
    outline-offset: 2px;
}

.copyright {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.7);
    margin: 0;
}

/* ===================================
   Responsive Design - Tablet
   =================================== */
@media (min-width: 768px) {
    .hero h1 {
        font-size: 56px;
    }

    .hero .tagline {
        font-size: var(--font-size-xl);
    }

    .destinations .container {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
    }

    .footer-content {
        flex-direction: row;
        justify-content: space-between;
    }
}

/* ===================================
   Responsive Design - Desktop
   =================================== */
@media (min-width: 1024px) {
    .hero {
        padding: calc(var(--spacing-xxl) * 1.5) var(--spacing-sm);
    }

    .hero h1 {
        font-size: 64px;
    }

    .destinations {
        padding: calc(var(--spacing-xxl) * 1.5) var(--spacing-sm);
    }

    .destinations .container {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-xl);
    }

    .container {
        padding: 0 var(--spacing-lg);
    }
}

/* ===================================
   Accessibility Improvements
   =================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus visible for keyboard navigation */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ===================================
   Print Styles
   =================================== */
@media print {
    .hero {
        background: white;
        color: black;
    }

    .card {
        box-shadow: none;
        border: 1px solid var(--color-divider);
        break-inside: avoid;
    }

    footer {
        background-color: white;
        color: black;
        border-top: 1px solid var(--color-divider);
    }
}