/* ===========================
   Reset & Base Styles
   =========================== */

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

:root {
    /* Colors - Dark theme with Red Hat branding */
    --bg-primary: #0f1419;
    --bg-secondary: #1a1f2e;
    --bg-tertiary: #252b3b;
    --bg-elevated: #2d3548;
    
    --text-primary: #e6edf3;
    --text-secondary: #9198a1;
    --text-muted: #6e7681;
    
    --accent-red: #ee0000;
    --accent-red-hover: #cc0000;
    --accent-red-light: rgba(238, 0, 0, 0.1);
    
    --border-color: #30363d;
    --border-hover: #484f58;
    
    --success-color: #3fb950;
    --warning-color: #d29922;
    
    /* Spacing */
    --container-max-width: 1200px;
    --section-padding: 5rem 2rem;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', Monaco, 'Cascadia Code', 'Courier New', monospace;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background: linear-gradient(135deg, #0f1419 0%, #1a1f2e 100%);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* ===========================
   Navigation
   =========================== */

.nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(15, 20, 25, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    padding: 1rem 0;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.1rem;
    transition: opacity 0.2s;
}

.logo:hover {
    opacity: 0.8;
}

.logo-icon {
    width: 28px;
    height: 28px;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.95rem;
    transition: color 0.2s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.nav-github-icon {
    width: 18px;
    height: 18px;
}

/* ===========================
   Hero Section
   =========================== */

.hero {
    padding: 8rem 0 6rem;
    margin-top: 60px;
}

.hero-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto 4rem;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title-accent {
    display: block;
    background: linear-gradient(135deg, var(--accent-red) 0%, #ff4d4d 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-top: 0.5rem;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.3rem);
    color: var(--text-secondary);
    margin-bottom: 3rem;
    line-height: 1.6;
}

.hero-cta {
    max-width: 800px;
    margin: 0 auto;
}

.hero-hint {
    margin-top: 1rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.hero-hint code {
    color: var(--accent-red);
}

.hero-demo {
    max-width: 1000px;
    margin: 0 auto;
}

/* ===========================
   Command Box & Copy Button
   =========================== */

.command-box {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem 1.5rem;
    margin-bottom: 0.5rem;
    transition: border-color 0.2s;
}

.command-box:hover {
    border-color: var(--border-hover);
}

.command-text {
    flex: 1;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--text-primary);
    overflow-x: auto;
    white-space: nowrap;
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
}

.command-text::-webkit-scrollbar {
    height: 6px;
}

.command-text::-webkit-scrollbar-track {
    background: transparent;
}

.command-text::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.copy-btn {
    position: relative;
    background: var(--accent-red);
    border: none;
    border-radius: 8px;
    padding: 0.6rem 0.8rem;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.copy-btn:hover {
    background: var(--accent-red-hover);
    transform: scale(1.05);
}

.copy-btn:active {
    transform: scale(0.98);
}

.copy-icon,
.check-icon {
    color: white;
    transition: opacity 0.2s;
}

.check-icon {
    position: absolute;
    opacity: 0;
}

.copy-btn.copied .copy-icon {
    opacity: 0;
}

.copy-btn.copied .check-icon {
    opacity: 1;
}

/* ===========================
   Demo Media & Placeholder
   =========================== */

.demo-media-container {
    position: relative;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    transition: all 0.3s;
}

.demo-media-container:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.demo-media {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    border-radius: 10px;
}

/* Placeholder state when image fails to load */
.demo-media-container.demo-placeholder {
    border-style: dashed;
    display: flex;
    align-items: center;
    justify-content: center;
}

.demo-media-container:not(.demo-placeholder) .placeholder-content {
    display: none;
}

.placeholder-content {
    text-align: center;
    color: var(--text-muted);
    padding: 2rem;
}

.placeholder-icon {
    margin-bottom: 1rem;
    opacity: 0.5;
}

.placeholder-content p {
    font-size: 0.95rem;
}

/* Legacy placeholder class (kept for backwards compatibility) */
.demo-placeholder {
    background: var(--bg-secondary);
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    aspect-ratio: 16 / 9;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
}

.demo-placeholder:hover {
    border-color: var(--border-hover);
    background: var(--bg-tertiary);
}

/* ===========================
   Section Styles
   =========================== */

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
}

.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 4rem;
}

/* ===========================
   Features Section
   =========================== */

.features {
    padding: var(--section-padding);
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    transition: all 0.3s;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-red);
    box-shadow: 0 8px 24px rgba(238, 0, 0, 0.15);
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: var(--accent-red-light);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.feature-icon svg {
    color: var(--accent-red);
}

.feature-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===========================
   How It Works Section
   =========================== */

.how-it-works {
    padding: var(--section-padding);
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 3rem;
    max-width: 1000px;
    margin: 0 auto;
}

.step {
    text-align: center;
}

.step-number {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--accent-red) 0%, #ff4d4d 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    font-weight: 700;
    margin: 0 auto 1.5rem;
    box-shadow: 0 4px 16px rgba(238, 0, 0, 0.3);
}

.step-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.step-description {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===========================
   Demo Section
   =========================== */

.demo-section {
    padding: var(--section-padding);
    background: var(--bg-secondary);
}

.demo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.demo-item {
    text-align: center;
}

.demo-caption {
    margin-top: 1rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ===========================
   Installation Section
   =========================== */

.installation {
    padding: var(--section-padding);
}

.install-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.install-tab {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-family: var(--font-primary);
    transition: all 0.2s;
}

.install-tab:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
}

.install-tab.active {
    background: var(--accent-red);
    border-color: var(--accent-red);
    color: white;
}

.install-content {
    max-width: 900px;
    margin: 0 auto;
}

.install-panel {
    display: none;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2.5rem;
}

.install-panel.active {
    display: block;
    animation: fadeIn 0.3s ease-in;
}

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

.install-title {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.install-subtitle {
    font-size: 1.2rem;
    font-weight: 600;
    margin: 2rem 0 1rem;
    color: var(--text-primary);
}

.install-description {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.7;
}

.install-steps {
    margin-top: 1.5rem;
}

.install-steps ol {
    padding-left: 1.5rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.install-steps li {
    margin-bottom: 0.75rem;
}

.install-steps code,
.install-steps a {
    color: var(--accent-red);
}

.install-steps a {
    text-decoration: none;
    transition: opacity 0.2s;
}

.install-steps a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

.install-panel .command-box {
    margin: 1.5rem 0;
}

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

.footer {
    padding: 4rem 0 2rem;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.footer-text {
    color: var(--text-secondary);
    line-height: 1.7;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--accent-red);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ===========================
   Utility Classes
   =========================== */

code {
    font-family: var(--font-mono);
    background: var(--bg-tertiary);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
}

.inline-link {
    color: var(--accent-red);
    text-decoration: none;
    transition: opacity 0.2s;
}

.inline-link:hover {
    opacity: 0.8;
    text-decoration: underline;
}

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

@media (max-width: 768px) {
    :root {
        --section-padding: 3rem 1.5rem;
    }
    
    .nav-links {
        gap: 1rem;
    }
    
    .nav-link {
        font-size: 0.85rem;
    }
    
    .hero {
        padding: 6rem 0 4rem;
    }
    
    .hero-content {
        margin-bottom: 3rem;
    }
    
    .command-box {
        flex-direction: column;
        align-items: stretch;
    }
    
    .command-text {
        font-size: 0.75rem;
        text-align: center;
    }
    
    .copy-btn {
        width: 100%;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .steps {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .demo-grid {
        grid-template-columns: 1fr;
    }
    
    .install-panel {
        padding: 1.5rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    .nav-links {
        display: none;
    }
    
    .logo {
        font-size: 1rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .install-tabs {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .install-tab {
        width: 100%;
    }
}

/* ===========================
   Animations & Effects
   =========================== */

@media (prefers-reduced-motion: no-preference) {
    .feature-card,
    .step,
    .demo-item {
        animation: fadeInUp 0.6s ease-out backwards;
    }
    
    .feature-card:nth-child(1),
    .step:nth-child(1),
    .demo-item:nth-child(1) {
        animation-delay: 0.1s;
    }
    
    .feature-card:nth-child(2),
    .step:nth-child(2),
    .demo-item:nth-child(2) {
        animation-delay: 0.2s;
    }
    
    .feature-card:nth-child(3),
    .step:nth-child(3),
    .demo-item:nth-child(3) {
        animation-delay: 0.3s;
    }
    
    .feature-card:nth-child(4) {
        animation-delay: 0.4s;
    }
    
    .feature-card:nth-child(5) {
        animation-delay: 0.5s;
    }
    
    .feature-card:nth-child(6) {
        animation-delay: 0.6s;
    }
}

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

/* ===========================
   Image Modal / Lightbox
   =========================== */

.image-modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.95);
    animation: fadeIn 0.3s ease-in;
}

.image-modal.active {
    display: block;
}

.modal-content {
    margin: auto;
    display: block;
    max-width: 90%;
    max-height: 85vh;
    object-fit: contain;
    animation: zoomIn 0.3s ease-out;
    border-radius: 8px;
    position: relative;
    top: 50%;
    transform: translateY(-50%);
}

@keyframes zoomIn {
    from {
        transform: translateY(-50%) scale(0.8);
        opacity: 0;
    }
    to {
        transform: translateY(-50%) scale(1);
        opacity: 1;
    }
}

.modal-close {
    position: absolute;
    top: 30px;
    right: 45px;
    color: #f1f1f1;
    font-size: 50px;
    font-weight: 300;
    cursor: pointer;
    transition: color 0.3s;
    z-index: 2001;
    line-height: 1;
    user-select: none;
}

.modal-close:hover,
.modal-close:focus {
    color: var(--accent-red);
}

.modal-caption {
    margin: auto;
    display: block;
    width: 80%;
    max-width: 700px;
    text-align: center;
    color: #ccc;
    padding: 20px 0;
    font-size: 1.1rem;
}

/* Clickable demo images */
.demo-media-container.clickable {
    cursor: pointer;
    position: relative;
}

.demo-media-container.clickable::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(238, 0, 0, 0);
    transition: background 0.3s;
    pointer-events: none;
}

.demo-media-container.clickable:hover::after {
    background: rgba(238, 0, 0, 0.1);
}

/* Click hint overlay */
.click-hint {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
    font-size: 0.95rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.demo-media-container.clickable:hover .click-hint {
    opacity: 1;
}

.click-hint svg {
    flex-shrink: 0;
}

/* Hide click hint on placeholder state */
.demo-media-container.demo-placeholder .click-hint {
    display: none;
}

/* Keyboard navigation for modal */
.image-modal:focus {
    outline: none;
}

/* Print styles */
@media print {
    .nav,
    .copy-btn,
    .image-modal {
        display: none;
    }
}

/* Mobile responsiveness for modal */
@media (max-width: 768px) {
    .modal-content {
        max-width: 95%;
        max-height: 80vh;
    }
    
    .modal-close {
        top: 15px;
        right: 20px;
        font-size: 40px;
    }
    
    .modal-caption {
        width: 90%;
        font-size: 1rem;
        padding: 15px 0;
    }
    
    .click-hint {
        padding: 0.75rem 1rem;
        font-size: 0.85rem;
    }
}