/* ========================================
   Site Header
   ======================================== */

.site-header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    padding: var(--space-12) 0;
    text-align: center;
    box-shadow: var(--shadow-md);
}

.site-header h1 {
    color: white;
    margin-bottom: var(--space-2);
    font-size: var(--text-4xl);
}

.site-header .subtitle {
    font-size: var(--text-lg);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--space-6);
}

.site-header .github-link {
    display: inline-block;
    padding: var(--space-3) var(--space-6);
    background: white;
    color: var(--color-primary);
    border-radius: var(--radius-full);
    font-weight: var(--font-semibold);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.site-header .github-link:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    text-decoration: none;
}

/* ========================================
   Feature Navigation (Tabs)
   ======================================== */

.feature-navigation {
    background: var(--color-background);
    border-bottom: 2px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.nav-tabs {
    display: flex;
    gap: var(--space-2);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scroll-snap-type: x proximity;
    scrollbar-width: thin;
    scrollbar-color: var(--color-gray-300) transparent;
    padding: var(--space-4) 0;
}

/* Hide scrollbar for Chrome/Safari */
.nav-tabs::-webkit-scrollbar {
    height: 4px;
}

.nav-tabs::-webkit-scrollbar-track {
    background: transparent;
}

.nav-tabs::-webkit-scrollbar-thumb {
    background: var(--color-gray-300);
    border-radius: var(--radius-full);
}

.nav-tabs::-webkit-scrollbar-thumb:hover {
    background: var(--color-gray-400);
}

.nav-tabs li {
    scroll-snap-align: start;
    flex-shrink: 0;
}

.nav-tab {
    display: block;
    padding: var(--space-3) var(--space-5);
    background: var(--color-background);
    color: var(--color-text-muted);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-weight: var(--font-medium);
    font-size: var(--text-sm);
    transition: all var(--transition-base);
    white-space: nowrap;
}

.nav-tab:hover {
    background: var(--color-gray-50);
    color: var(--color-text);
    border-color: var(--color-gray-300);
}

.nav-tab.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

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

/* Desktop: horizontal layout with better spacing */
@media (min-width: 1024px) {
    .nav-tabs {
        flex-wrap: wrap;
        overflow-x: visible;
    }

    .nav-tab {
        font-size: var(--text-base);
        padding: var(--space-4) var(--space-6);
    }
}

/* ========================================
   Main Content
   ======================================== */

.main-content {
    padding: var(--space-12) 0;
    min-height: 60vh;
    background: var(--color-background-alt);
}

/* ========================================
   Feature Sections
   ======================================== */

.feature-section {
    display: none;
    animation: fadeIn var(--transition-base);
}

.feature-section.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Feature Header */
.feature-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-4);
    margin-bottom: var(--space-8);
    padding-bottom: var(--space-6);
    border-bottom: 3px solid var(--color-primary);
}

.feature-header h2 {
    margin: 0;
    flex: 1 1 auto;
}

/* Support Badges */
.support-badge {
    display: inline-block;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.support-badge.widely-supported {
    background: var(--color-success);
    color: white;
}

.support-badge.good-support {
    background: var(--color-warning);
    color: white;
}

.support-badge.emerging {
    background: var(--color-caution);
    color: white;
}

.support-badge.not-supported {
    background: var(--color-danger);
    color: white;
}

/* Feature Description */
.feature-description {
    background: white;
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-8);
    border-left: 4px solid var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.feature-description p {
    font-size: var(--text-lg);
    line-height: var(--leading-relaxed);
    color: var(--color-text);
}

/* Demo Container */
.demo-container {
    background: white;
    padding: var(--space-8);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-8);
    box-shadow: var(--shadow-md);
}

.demo-container h3 {
    font-size: var(--text-xl);
    margin-bottom: var(--space-6);
    color: var(--color-text);
    padding-bottom: var(--space-3);
    border-bottom: 2px solid var(--color-gray-200);
}

/* Fallback Message */
.fallback-message {
    background: linear-gradient(135deg, #fff5f5 0%, #ffe5e5 100%);
    border-left: 4px solid var(--color-danger);
    padding: var(--space-6);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-6);
}

.fallback-message p {
    margin-bottom: var(--space-3);
    color: var(--color-gray-800);
}

.fallback-message p:last-child {
    margin-bottom: 0;
}

.fallback-message strong {
    color: var(--color-danger);
    font-size: var(--text-lg);
}

/* Code Examples */
.code-example {
    margin-bottom: var(--space-8);
}

.code-example h3 {
    font-size: var(--text-xl);
    margin-bottom: var(--space-4);
}

.code-example pre {
    margin-bottom: var(--space-4);
    box-shadow: var(--shadow-md);
}

/* Resources */
.resources {
    background: white;
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.resources h3 {
    font-size: var(--text-xl);
    margin-bottom: var(--space-4);
}

.resources ul {
    list-style: disc;
    padding-left: var(--space-6);
}

.resources li {
    margin-bottom: var(--space-2);
}

.resources li:last-child {
    margin-bottom: 0;
}

.resources a {
    font-weight: var(--font-medium);
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
}

/* ========================================
   Site Footer
   ======================================== */

.site-footer {
    background: var(--color-gray-900);
    color: var(--color-gray-300);
    padding: var(--space-12) 0;
    text-align: center;
}

.site-footer p {
    margin-bottom: var(--space-3);
}

.site-footer p:last-child {
    margin-bottom: 0;
}

.site-footer a {
    color: var(--color-gray-100);
    font-weight: var(--font-medium);
}

.site-footer a:hover {
    color: white;
}

/* ========================================
   Responsive Design
   ======================================== */

/* Tablet and up */
@media (min-width: 768px) {
    .site-header h1 {
        font-size: var(--text-5xl);
    }

    .site-header .subtitle {
        font-size: var(--text-xl);
    }

    .main-content {
        padding: var(--space-16) 0;
    }

    .demo-container {
        padding: var(--space-12);
    }
}

/* Desktop and up */
@media (min-width: 1024px) {
    .feature-header {
        gap: var(--space-6);
    }

    .feature-description {
        padding: var(--space-8);
    }
}

/* ========================================
   Accessibility
   ======================================== */

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

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

/* High contrast mode support */
@media (prefers-contrast: high) {
    .nav-tab {
        border-width: 3px;
    }

    .feature-header {
        border-bottom-width: 4px;
    }
}