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

/* CSS Custom Properties */
:root {
    /* Colors */
    --color-bg-primary: #0a0a0a;
    --color-bg-secondary: #1a1a1a;
    --color-text-primary: #f5f5f5;
    --color-text-secondary: #a0a0a0;
    --color-accent: #D4AF37;
    --color-accent-hover: #E5C158;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-2xl: 64px;
    --spacing-3xl: 96px;
    
    /* Transitions */
    --transition-fast: 200ms cubic-bezier(0.4, 0.0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0.0, 0.2, 1);
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

/* Container Utility */
.container {
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--spacing-lg);
    padding-right: var(--spacing-lg);
}

.container-narrow {
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--spacing-lg);
    padding-right: var(--spacing-lg);
}

/* Spacing Utilities */
.mt-xs { margin-top: var(--spacing-xs); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mt-2xl { margin-top: var(--spacing-2xl); }
.mt-3xl { margin-top: var(--spacing-3xl); }

.mb-xs { margin-bottom: var(--spacing-xs); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.mb-2xl { margin-bottom: var(--spacing-2xl); }
.mb-3xl { margin-bottom: var(--spacing-3xl); }

.pt-xs { padding-top: var(--spacing-xs); }
.pt-sm { padding-top: var(--spacing-sm); }
.pt-md { padding-top: var(--spacing-md); }
.pt-lg { padding-top: var(--spacing-lg); }
.pt-xl { padding-top: var(--spacing-xl); }
.pt-2xl { padding-top: var(--spacing-2xl); }
.pt-3xl { padding-top: var(--spacing-3xl); }

.pb-xs { padding-bottom: var(--spacing-xs); }
.pb-sm { padding-bottom: var(--spacing-sm); }
.pb-md { padding-bottom: var(--spacing-md); }
.pb-lg { padding-bottom: var(--spacing-lg); }
.pb-xl { padding-bottom: var(--spacing-xl); }
.pb-2xl { padding-bottom: var(--spacing-2xl); }
.pb-3xl { padding-bottom: var(--spacing-3xl); }

/* Button Component Styles */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-weight: 600;
    text-decoration: none;
    border-radius: 8px;
    transition: all var(--transition-base);
    cursor: pointer;
    border: 2px solid transparent;
    text-align: center;
    font-size: 1rem;
    line-height: 1.5;
}

.btn-primary {
    background-color: var(--color-accent);
    color: var(--color-bg-primary);
    border-color: var(--color-accent);
}

.btn-primary:hover,
.btn-primary:focus {
    background-color: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(212, 175, 55, 0.3);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 4px 10px rgba(212, 175, 55, 0.2);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-accent);
    border-color: var(--color-accent);
}

.btn-secondary:hover,
.btn-secondary:focus {
    background-color: var(--color-accent);
    color: var(--color-bg-primary);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(212, 175, 55, 0.2);
}

.btn-secondary:active {
    transform: translateY(0);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.125rem;
}

.btn-small {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.875rem;
}

/* Card Component Styles */
.card {
    background-color: var(--color-bg-secondary);
    border-radius: 12px;
    padding: var(--spacing-lg);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.card-text {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    display: block;
}

.card-elevated {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.card-elevated:hover {
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
}

/* Base Typography */
html {
    font-size: 16px;
    scroll-behavior: smooth;
}

/* Web Font Loading with font-display: swap */
@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 400 700;
    font-display: swap;
    src: local('Inter'), local('Inter-Regular');
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Hero Branding */
.hero-branding {
    position: absolute;
    top: var(--spacing-lg);
    left: var(--spacing-lg);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent);
    z-index: 10;
    letter-spacing: -0.01em;
}

/* Responsive hero branding */
@media (max-width: 479px) {
    .hero-branding {
        font-size: 1.25rem;
        top: var(--spacing-md);
        left: var(--spacing-md);
    }
}

/* Global Focus Styles for Keyboard Navigation */
*:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* Remove default focus outline for mouse users, keep for keyboard users */
*:focus:not(:focus-visible) {
    outline: none;
}

*:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 3px;
}

/* Enhanced focus visibility when keyboard navigation is active */
body.keyboard-navigation *:focus {
    outline: 3px solid var(--color-accent);
    outline-offset: 3px;
    box-shadow: 0 0 0 6px rgba(212, 175, 55, 0.2);
}

/* Placeholder styles - will be expanded in subsequent tasks */

/* Hero Section */
.hero-section {
    min-height: 100vh;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    background-color: var(--color-bg-primary);
    position: relative;
    overflow: hidden;
}

/* Optional: Add subtle gradient background */
.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 50% 50%, rgba(212, 175, 55, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Respect user's motion preferences */
@media (prefers-reduced-motion: reduce) {
    .hero-content {
        animation: none;
    }
    
    .cta-button:hover,
    .cta-button:focus {
        transform: none;
    }
    
    .app-icon:hover {
        transform: none;
    }
    
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
}

.hero-tagline {
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.hero-description {
    font-size: clamp(1rem, 2vw, 1.125rem);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
    max-width: 600px;
}

.hero-visual {
    margin: var(--spacing-xl) 0;
    display: flex;
    justify-content: center;
    align-items: center;
}

.app-icon {
    max-width: 200px;
    width: 100%;
    height: auto;
    display: block;
    border-radius: 20%;
    box-shadow: 0 10px 40px rgba(212, 175, 55, 0.2);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.app-icon:hover {
    transform: scale(1.05);
    box-shadow: 0 15px 50px rgba(212, 175, 55, 0.3);
}

.cta-button {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-xl);
    background-color: var(--color-accent);
    color: var(--color-bg-primary);
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1.125rem;
    transition: all var(--transition-base);
    border: 2px solid var(--color-accent);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.cta-button:hover {
    background-color: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(212, 175, 55, 0.3);
}

.cta-button:focus {
    background-color: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(212, 175, 55, 0.3);
    outline: 3px solid var(--color-text-primary);
    outline-offset: 4px;
}

.cta-button:focus-visible {
    outline: 4px solid var(--color-text-primary);
    outline-offset: 4px;
}

.cta-button:active {
    transform: translateY(0);
    box-shadow: 0 4px 10px rgba(212, 175, 55, 0.2);
}

/* About Section */
.about-section {
    padding: var(--spacing-3xl) var(--spacing-lg);
    background-color: var(--color-bg-secondary);
}

.about-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.about-content h2 {
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    margin-bottom: var(--spacing-lg);
}

/* Features Section */
.features-section {
    padding: var(--spacing-3xl) var(--spacing-lg);
    text-align: center;
}

.features-section h2 {
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    margin-bottom: var(--spacing-2xl);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    padding: var(--spacing-lg);
    background-color: var(--color-bg-secondary);
    border-radius: 12px;
    transition: transform var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-4px);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.feature-card p {
    color: var(--color-text-secondary);
}

/* Footer */
.site-footer {
    padding: var(--spacing-xl) var(--spacing-lg);
    background-color: var(--color-bg-secondary);
    text-align: center;
    margin-top: var(--spacing-3xl);
    border-top: 1px solid rgba(212, 175, 55, 0.1);
}

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

.copyright {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin: 0;
}

.contact {
    font-size: 0.875rem;
    margin: 0;
}

.contact a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.contact a:hover,
.contact a:focus {
    color: var(--color-accent-hover);
    text-decoration: underline;
}

.contact a:focus {
    outline: 3px solid var(--color-accent);
    outline-offset: 3px;
    border-radius: 2px;
}

.contact a:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 3px;
    border-radius: 2px;
}

.footer-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
}

.footer-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links a:hover,
.footer-links a:focus {
    color: var(--color-accent);
    text-decoration: underline;
}

.footer-links a:focus {
    outline: 3px solid var(--color-accent);
    outline-offset: 3px;
    border-radius: 2px;
}

.footer-links a:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 3px;
    border-radius: 2px;
}

.footer-links .separator {
    color: var(--color-text-secondary);
    opacity: 0.5;
}

/* Responsive footer layout */
@media (min-width: 768px) {
    .footer-content {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
    
    .footer-links {
        margin-top: 0;
    }
}

/* ============================================
   RESPONSIVE DESIGN - MEDIA QUERIES
   ============================================ */

/* Mobile First Approach - Base styles above are for mobile (320px+) */

/* Small Mobile Devices (320px - 479px) */
@media (max-width: 479px) {
    .hero-section {
        padding: var(--spacing-md);
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-tagline {
        font-size: 1.125rem;
    }
    
    .hero-description {
        font-size: 0.9375rem;
    }
    
    .app-icon {
        max-width: 150px;
    }
    
    .cta-button {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: 1rem;
        width: 100%;
        max-width: 280px;
    }
    
    .about-section,
    .features-section {
        padding: var(--spacing-2xl) var(--spacing-md);
    }
    
    .about-content h2,
    .features-section h2 {
        font-size: 1.5rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .feature-card {
        padding: var(--spacing-md);
    }
    
    .site-footer {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .footer-content {
        font-size: 0.8125rem;
    }
}

/* Mobile Devices (480px - 767px) */
@media (min-width: 480px) and (max-width: 767px) {
    .hero-section {
        padding: var(--spacing-lg);
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-tagline {
        font-size: 1.25rem;
    }
    
    .app-icon {
        max-width: 180px;
    }
    
    .cta-button {
        width: auto;
        min-width: 200px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
}

/* Tablet Devices (768px - 1023px) */
@media (min-width: 768px) and (max-width: 1023px) {
    .hero-section {
        padding: var(--spacing-xl);
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-tagline {
        font-size: 1.5rem;
    }
    
    .hero-description {
        font-size: 1.0625rem;
    }
    
    .app-icon {
        max-width: 200px;
    }
    
    .about-section,
    .features-section {
        padding: var(--spacing-3xl) var(--spacing-xl);
    }
    
    .about-content h2,
    .features-section h2 {
        font-size: 2rem;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
    }
    
    /* Make the third card span both columns for better layout */
    .feature-card:nth-child(3) {
        grid-column: 1 / -1;
        max-width: 500px;
        margin: 0 auto;
    }
}

/* Desktop Devices (1024px - 1439px) */
@media (min-width: 1024px) and (max-width: 1439px) {
    .hero-section {
        padding: var(--spacing-2xl);
    }
    
    .hero-title {
        font-size: 3.5rem;
    }
    
    .hero-tagline {
        font-size: 1.625rem;
    }
    
    .hero-description {
        font-size: 1.125rem;
    }
    
    .app-icon {
        max-width: 220px;
    }
    
    .about-section,
    .features-section {
        padding: var(--spacing-3xl) var(--spacing-2xl);
    }
    
    .about-content h2,
    .features-section h2 {
        font-size: 2.25rem;
    }
    
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-xl);
    }
    
    /* Reset the third card styling from tablet */
    .feature-card:nth-child(3) {
        grid-column: auto;
        max-width: none;
    }
}

/* Large Desktop Devices (1440px+) */
@media (min-width: 1440px) {
    .hero-section {
        padding: var(--spacing-3xl);
    }
    
    .hero-title {
        font-size: 4rem;
    }
    
    .hero-tagline {
        font-size: 1.75rem;
    }
    
    .hero-description {
        font-size: 1.125rem;
        max-width: 700px;
    }
    
    .app-icon {
        max-width: 240px;
    }
    
    .about-section,
    .features-section {
        padding: var(--spacing-3xl) var(--spacing-3xl);
    }
    
    .about-content {
        max-width: 800px;
    }
    
    .about-content h2,
    .features-section h2 {
        font-size: 2.5rem;
    }
    
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-2xl);
        max-width: 1400px;
    }
    
    .feature-card {
        padding: var(--spacing-xl);
    }
    
    .feature-card h3 {
        font-size: 1.375rem;
    }
    
    .feature-card p {
        font-size: 1.0625rem;
    }
}

/* Ultra-wide Displays (1920px+) */
@media (min-width: 1920px) {
    .hero-content {
        max-width: 1000px;
    }
    
    .about-content {
        max-width: 900px;
    }
    
    .features-grid {
        max-width: 1600px;
    }
}

/* Landscape Orientation Adjustments for Mobile/Tablet */
@media (max-height: 600px) and (orientation: landscape) {
    .hero-section {
        min-height: auto;
        height: auto;
        padding: var(--spacing-xl) var(--spacing-lg);
    }
    
    .hero-visual {
        margin: var(--spacing-lg) 0;
    }
    
    .app-icon {
        max-width: 120px;
    }
    
    .hero-title {
        margin-bottom: var(--spacing-sm);
    }
    
    .hero-tagline {
        margin-bottom: var(--spacing-sm);
    }
    
    .hero-description {
        margin-bottom: var(--spacing-md);
    }
}

/* Print Styles */
@media print {
    .skip-link,
    .cta-button {
        display: none;
    }
    
    .hero-section {
        min-height: auto;
        height: auto;
        page-break-after: always;
    }
    
    body {
        background-color: white;
        color: black;
    }
    
    .hero-section::before {
        display: none;
    }
    
    a {
        color: black;
        text-decoration: underline;
    }
    
    .contact a::after {
        content: " (" attr(href) ")";
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --color-bg-primary: #000000;
        --color-bg-secondary: #1a1a1a;
        --color-text-primary: #ffffff;
        --color-accent: #FFD700;
        --color-accent-hover: #FFED4E;
    }
    
    .cta-button {
        border-width: 3px;
    }
    
    .feature-card {
        border: 2px solid var(--color-text-secondary);
    }
}

/* Ensure no horizontal overflow at any width */
body {
    overflow-x: hidden;
}

.hero-section,
.about-section,
.features-section,
.site-footer {
    max-width: 100vw;
    overflow-x: hidden;
}

/* Ensure images don't cause overflow */
img {
    max-width: 100%;
    height: auto;
}