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

:root {
    /* Colors - PHP Brand Inspired */
    --primary-color: #4F5B93;
    --primary-light: #6B7BC7;
    --primary-dark: #3A4470;
    --accent-color: #8892BF;
    --success-color: #22C55E;
    --warning-color: #F59E0B;
    --error-color: #EF4444;
    
    /* Neutral Colors */
    --white: #FFFFFF;
    --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;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --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);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
}

/* Base Typography */
html {
    font-size: 16px;
    line-height: 1.5;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    color: var(--gray-800);
    background-color: var(--white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--space-6);
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 var(--space-8);
    }
}

/* Header */
.header {
    background-color: var(--white);
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(8px);
    background-color: rgba(255, 255, 255, 0.95);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4rem;
}

.logo {
    display: flex;
    align-items: center;
}

.php-logo {
    width: 4rem;
    height: 2rem;
    color: var(--primary-color);
}

.logo-text {
    font-family: var(--font-mono);
    font-weight: 700;    
    font-size: 1.875rem;
    fill: currentColor;
}

.nav {
    display: none;
    gap: var(--space-6);
}

@media (min-width: 768px) {
    .nav {
        display: flex;
    }
}

.nav-link {
    color: var(--gray-600);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width var(--transition-fast);
}

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

/* Hero Section */
.hero {
    padding: var(--space-16) 0 var(--space-20);
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 20%, rgba(79, 91, 147, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(136, 146, 191, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.version-badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-2) var(--space-4);
    background-color: var(--primary-color);
    color: var(--white);
    border-radius: var(--radius-xl);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--space-6);
    box-shadow: var(--shadow-md);
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: var(--space-6);
    line-height: 1.1;
}

@media (min-width: 768px) {
    .hero-title {
        font-size: 4rem;
    }
}

@media (min-width: 1024px) {
    .hero-title {
        font-size: 5rem;
    }
}

.version-number {
    color: var(--primary-color);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: var(--space-8);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

@media (min-width: 768px) {
    .hero-subtitle {
        font-size: 1.25rem;
    }
}

.hero-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    align-items: center;
    margin-bottom: var(--space-8);
}

@media (min-width: 640px) {
    .hero-actions {
        flex-direction: row;
        justify-content: center;
    }
}

.release-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    align-items: center;
    font-size: 0.875rem;
    color: var(--gray-500);
}

@media (min-width: 640px) {
    .release-info {
        flex-direction: row;
        gap: var(--space-4);
    }
}

.separator {
    display: none;
}

@media (min-width: 640px) {
    .separator {
        display: inline;
    }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-lg);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-fast);
    border: 2px solid transparent;
    cursor: pointer;
    font-size: 1rem;
    min-width: 160px;
    justify-content: center;
}

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

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

.btn-secondary {
    background-color: var(--white);
    color: var(--primary-color);
    border-color: var(--gray-300);
}

.btn-secondary:hover {
    background-color: var(--gray-50);
    border-color: var(--primary-color);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

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

.btn-icon {
    width: 1rem;
    height: 1rem;
    stroke-width: 2;
}

/* Features Section */
.features {
    padding: var(--space-20) 0;
    background-color: var(--white);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-16);
}

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-4);
}

@media (min-width: 768px) {
    .section-title {
        font-size: 2.75rem;
    }
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--gray-600);
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-8);
}

@media (min-width: 768px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.feature-card {
    padding: var(--space-8);
    background-color: var(--white);
    border-radius: var(--radius-xl);
    border: 1px solid var(--gray-200);
    transition: all var(--transition-normal);
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.feature-icon {
    width: 3rem;
    height: 3rem;
    margin: 0 auto var(--space-6);
    padding: var(--space-3);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: var(--radius-lg);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-icon svg {
    width: 1.5rem;
    height: 1.5rem;
    stroke-width: 2;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--space-3);
}

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

/* Download Section */
.download {
    padding: var(--space-20) 0;
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 100%);
}

.download-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-12);
    align-items: center;
}

@media (min-width: 1024px) {
    .download-content {
        grid-template-columns: 1fr 1.5fr;
    }
}

.download-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-4);
}

.download-description {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: var(--space-8);
}

.download-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--space-1);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-600);
    font-weight: 500;
}

.download-options {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
}

@media (min-width: 768px) {
    .download-options {
        grid-template-columns: repeat(3, 1fr);
    }
}

.download-card {
    padding: var(--space-8);
    background-color: var(--white);
    border-radius: var(--radius-xl);
    border: 2px solid var(--gray-200);
    text-align: center;
    transition: all var(--transition-normal);
}

.download-card.featured {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, var(--white) 0%, var(--gray-50) 100%);
    transform: scale(1.05);
}

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

.download-card.featured:hover {
    transform: translateY(-4px) scale(1.05);
}

.download-card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--space-3);
}

.download-card-description {
    color: var(--gray-600);
    margin-bottom: var(--space-6);
    font-size: 0.875rem;
}

/* Migration Section */
.migration {
    padding: var(--space-20) 0;
    background-color: var(--white);
}

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

.migration-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-8);
    margin: var(--space-12) 0;
}

@media (min-width: 768px) {
    .migration-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.migration-item {
    padding: var(--space-6);
}

.migration-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--space-3);
}

.migration-description {
    color: var(--gray-600);
}

.migration-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    align-items: center;
}

@media (min-width: 640px) {
    .migration-actions {
        flex-direction: row;
        justify-content: center;
    }
}

/* Footer */
.footer {
    background-color: var(--gray-900);
    color: var(--gray-300);
    padding: var(--space-16) 0 var(--space-8);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-8);
    margin-bottom: var(--space-12);
}

@media (min-width: 768px) {
    .footer-content {
        grid-template-columns: 2fr 1fr 1fr 1fr;
    }
}

.footer-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: var(--space-4);
}

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

.footer-heading {
    font-size: 1rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: var(--space-4);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer-link {
    color: var(--gray-400);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    border-top: 1px solid var(--gray-700);
    padding-top: var(--space-8);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    align-items: center;
    text-align: center;
}

@media (min-width: 768px) {
    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }
}

.footer-copyright {
    color: var(--gray-400);
    font-size: 0.875rem;
}

.footer-meta {
    display: flex;
    gap: var(--space-4);
    align-items: center;
    font-size: 0.875rem;
    color: var(--gray-500);
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* Focus styles */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

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

/* Print styles */
@media print {
    .header,
    .footer {
        display: none;
    }
    
    .hero,
    .features,
    .download,
    .migration {
        page-break-inside: avoid;
    }
}