:root {
    --color-black: #000000;
    --color-bg-dark: #0a0a0a;
    --color-bg-elevated: #111111;
    --color-text-primary: #ffffff;
    --color-text-secondary: #a0a0a0;
    --color-text-muted: #666666;
    --color-accent: #5bc0de;
    --color-accent-hover: #6dd5f5;
    --color-accent-dim: rgba(91, 192, 222, 0.08);
    --color-border: rgba(255, 255, 255, 0.06);
    --color-border-hover: rgba(91, 192, 222, 0.3);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);
    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 24px;
    --space-lg: 32px;
    --space-xl: 48px;
    --space-2xl: 64px;
    --space-3xl: 96px;
    --space-4xl: 128px;
    --space-5xl: 160px;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-mono: "SF Mono", "Consolas", "Monaco", "Courier New", monospace;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
    --transition-slow: 0.4s ease;
    --transition-smooth: 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--color-black);
    color: var(--color-text-primary);
    font-family: var(--font-sans);
    font-size: 18px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

.container-narrow {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    width: 100%;
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    padding: var(--space-4xl) 0;
}

.hero-brand {
    font-size: 96px;
    font-weight: 800;
    line-height: 1;
    letter-spacing: -2px;
    color: var(--color-accent);
    text-transform: uppercase;
    margin: 0 0 var(--space-md) 0;
}

.version-badge {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: 100px;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: var(--space-xl);
}

.hero-title {
    font-size: 56px;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -1.5px;
    color: var(--color-text-primary);
    margin: 0 0 var(--space-md) 0;
}

.hero-subtitle {
    font-size: 18px;
    line-height: 1.7;
    color: var(--color-text-secondary);
    max-width: 720px;
    margin: 0 auto var(--space-2xl) auto;
}

.hero-actions {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) var(--space-xl);
    font-size: 15px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    font-family: var(--font-sans);
}

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

.btn-primary:hover {
    background: var(--color-accent-hover);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-smooth);
}

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

.btn-secondary {
    background: transparent;
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    border-color: var(--color-accent);
    background: var(--color-accent-dim);
    color: var(--color-accent);
    transition: all var(--transition-smooth);
    transform: translateY(-2px);
}

.section {
    padding: var(--space-5xl) 0;
    position: relative;
}

.section-video { background: var(--color-bg-dark); }
.section-features { background: var(--color-black); }
.section-how { background: var(--color-bg-dark); }
.section-install { background: var(--color-black); }

.section-title {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -1px;
    color: var(--color-text-primary);
    text-align: center;
    margin: 0 0 var(--space-2xl) 0;
}

.video-wrapper {
    max-width: 1000px;
    margin: 0 auto;
}

.video-container {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
    background: var(--color-bg-elevated);
    transition: all var(--transition-smooth);
}

.video-container:hover {
    box-shadow: 0 12px 40px rgba(91, 192, 222, 0.15);
    border-color: var(--color-border-hover);
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.video-caption {
    text-align: center;
    margin-top: var(--space-md);
    font-size: 14px;
    color: var(--color-text-muted);
    letter-spacing: 0.3px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-lg);
}

.feature {
    text-align: center;
    padding: var(--space-xl);
    background: var(--color-bg-dark);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-smooth);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 280px;
}

.feature:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    background: var(--color-bg-elevated);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: var(--space-md);
    display: block;
}

.feature-title {
    font-size: 20px;
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: -0.3px;
    color: var(--color-text-primary);
    margin: 0 0 var(--space-sm) 0;
}

.feature-description {
    font-size: 15px;
    line-height: 1.6;
    color: var(--color-text-secondary);
    margin: 0;
}

.steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-lg);
    max-width: 1100px;
    margin: 0 auto;
    width: 100%;
}

.step {
    flex: 1;
    max-width: 250px;
    text-align: center;
    padding: var(--space-xl);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-smooth);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 220px;
    gap: var(--space-sm);
}

.step:hover {
    border-color: var(--color-accent);
    background: var(--color-bg-elevated);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.step-number {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--color-accent);
    color: var(--color-black);
    font-size: 24px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.step-title {
    font-size: 17px;
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-text-primary);
    margin: 0;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.step-description {
    font-size: 13px;
    line-height: 1.5;
    color: var(--color-text-secondary);
    margin: 0;
    min-height: 39px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.step-arrow {
    font-size: 24px;
    color: var(--color-text-muted);
    flex-shrink: 0;
    align-self: center;
}

.install-step {
    display: flex;
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
    padding-bottom: var(--space-2xl);
    border-bottom: 1px solid var(--color-border);
}

.install-step:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.install-number {
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--color-bg-elevated);
    border: 2px solid var(--color-accent);
    color: var(--color-accent);
    font-size: 24px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
}

.install-content { flex: 1; min-width: 0; }

.install-title {
    font-size: 24px;
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: -0.5px;
    color: var(--color-text-primary);
    margin: 0 0 var(--space-sm) 0;
}

.install-description {
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-secondary);
    margin: 0 0 var(--space-md) 0;
}

.install-files {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.install-file {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.file-icon {
    font-size: 20px;
    flex-shrink: 0;
}

.install-file code {
    flex: 1;
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--color-accent);
    background: none;
    padding: 0;
    border: none;
}

.btn-install-download {
    margin-top: var(--space-sm);
    display: inline-flex;
}

.file-label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-text-muted);
    padding: 4px 8px;
    background: var(--color-bg-dark);
    border-radius: var(--radius-sm);
}

.path-boxes {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.path-box {
    padding: var(--space-md);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    min-width: 0;
}

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

.path-box[data-platform].platform-active {
    border-color: var(--color-accent);
    background: var(--color-accent-dim);
}

.path-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-sm);
}

.path-label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-accent);
}

.path-box.platform-active .path-label { color: var(--color-accent-hover); }

.copy-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--color-bg-dark);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-sans);
}

.copy-btn:hover {
    background: var(--color-accent-dim);
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.copy-btn:active { transform: scale(0.95); }

.copy-btn.copied {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: var(--color-black);
}

.copy-icon { font-size: 14px; }

.path-code {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--color-text-secondary);
    word-break: break-all;
    display: block;
    line-height: 1.6;
    overflow-x: auto;
    padding-bottom: 4px;
}

code {
    font-family: var(--font-mono);
    font-size: 14px;
    color: var(--color-accent);
    background: var(--color-bg-elevated);
    padding: 3px 8px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
}

strong {
    font-weight: 600;
    color: var(--color-text-primary);
}

.footer {
    padding: var(--space-3xl) 0;
    text-align: center;
    border-top: 1px solid var(--color-border);
}

.footer-text {
    font-size: 14px;
    color: var(--color-text-muted);
    margin: 0 0 var(--space-xs) 0;
}

.footer-version {
    font-size: 12px;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
    margin: 0;
}

.heart {
    color: #ff4466;
    display: inline-block;
    animation: heartbeat 1.5s ease-in-out infinite;
}

@keyframes heartbeat {
    0%, 100% { transform: scale(1); }
    10% { transform: scale(1.1); }
    20% { transform: scale(1); }
}

.footer-link {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition-fast);
}

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

@keyframes subtleScale {
    from { transform: scale(1); }
    to { transform: scale(1.02); }
}

@keyframes glowPulse {
    0%, 100% { box-shadow: 0 4px 16px rgba(91, 192, 222, 0.1); }
    50% { box-shadow: 0 4px 24px rgba(91, 192, 222, 0.2); }
}

.section-title, .feature, .step, .video-wrapper, .install-step {
    opacity: 0;
    transform: translateY(6px);
    transition: opacity 750ms cubic-bezier(.2,.9,.2,1), transform 750ms cubic-bezier(.2,.9,.2,1);
}

.in-view {
    opacity: 1 !important;
    transform: translateY(0) !important;
}

.hero-brand, .hero-title, .hero-subtitle, .hero-actions {
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 750ms cubic-bezier(.2,.9,.2,1), transform 750ms cubic-bezier(.2,.9,.2,1);
}

@media (prefers-reduced-motion: reduce) {
    .hero-brand, .hero-title, .hero-subtitle, .hero-actions {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    .section-title, .feature, .step, .video-wrapper, .install-step {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

@media (max-width: 1024px) {
    .hero-brand { font-size: 72px; }
    .hero-title { font-size: 48px; }
    .section-title { font-size: 40px; }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .steps { flex-wrap: wrap; }
    .step-arrow { display: none; }
}

@media (max-width: 768px) {
    body { font-size: 16px; }
    .container, .container-narrow { padding: 0 var(--space-md); }
    .section { padding: var(--space-4xl) 0; }
    .hero { min-height: auto; padding: var(--space-4xl) 0; }
    .hero-brand { font-size: 56px; }
    .hero-title { font-size: 36px; letter-spacing: -1px; }
    .hero-subtitle { font-size: 16px; }
    .hero-actions { flex-direction: column; width: 100%; }
    .btn { width: 100%; padding: var(--space-md) var(--space-lg); }
    .section-title { font-size: 32px; margin-bottom: var(--space-xl); }
    .features-grid { grid-template-columns: 1fr; gap: var(--space-md); }
    .feature { padding: var(--space-md); }
    .feature-icon { font-size: 40px; }
    .feature-title { font-size: 18px; }
    .steps { flex-direction: column; }
    .step { width: 100%; min-width: auto; max-width: none; padding: var(--space-md); }
    .step-arrow { display: block; transform: rotate(90deg); padding: var(--space-sm) 0; }
    .install-step { flex-direction: column; gap: var(--space-md); margin-bottom: var(--space-xl); padding-bottom: var(--space-xl); }
    .install-number { width: 48px; height: 48px; font-size: 20px; }
    .install-title { font-size: 20px; }
    .install-description { font-size: 15px; }
    .path-code { font-size: 12px; white-space: nowrap; }
}

@media (max-width: 480px) {
    .hero-brand { font-size: 48px; }
    .hero-title { font-size: 28px; }
    .section-title { font-size: 28px; }
    .feature-icon { font-size: 36px; }
    .install-file { flex-wrap: wrap; }
    .install-file code { width: 100%; font-size: 12px; }
}

*:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

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

@media (prefers-contrast: high) {
    :root { --color-border: rgba(255, 255, 255, 0.3); }
}