/* Design Tokens - Colors */
:root {
    /* Palette */
    --color-black: #05070C;
    --color-ink: #0A0F1E;
    --color-navy: #0B132A;
    --color-slate: #151B2E;
    --color-fog: #9AA3B2;
    --color-mist: #C9D0DD;
    --color-white: #F2F5FA;
    --color-blue-glow: #6EA8FF;
    --color-violet-wash: #2B1B2C;
    --color-crimson-wash: #401428;
    
    /* Semantic Colors */
    --bg-base: var(--color-black);
    --bg-layer1: var(--color-ink);
    --bg-overlay: rgba(0, 0, 0, 0.45);
    --text-primary: var(--color-white);
    --text-secondary: rgba(242, 245, 250, 0.55);
    --text-muted: rgba(242, 245, 250, 0.40);
    --border-subtle: rgba(242, 245, 250, 0.10);
    --border-strong: rgba(242, 245, 250, 0.18);
    --focus-ring: rgba(110, 168, 255, 0.55);
    --accent-primary: var(--color-blue-glow);
    --accent-glow: rgba(110, 168, 255, 0.25);
    
    /* Spacing */
    --spacing-0: 0;
    --spacing-1: 4px;
    --spacing-2: 8px;
    --spacing-3: 12px;
    --spacing-4: 16px;
    --spacing-5: 20px;
    --spacing-6: 24px;
    --spacing-8: 32px;
    --spacing-10: 40px;
    --spacing-12: 48px;
    --spacing-16: 64px;
    --spacing-20: 80px;
    --spacing-24: 96px;
    --spacing-32: 128px;
    
    /* Border Radius */
    --radius-none: 0;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-pill: 999px;
    
    /* Motion */
    --duration-fast: 120ms;
    --duration-base: 180ms;
    --duration-slow: 320ms;
    --duration-ambient: 1200ms;
    --easing-standard: cubic-bezier(0.2, 0.8, 0.2, 1);
    --easing-out: cubic-bezier(0.16, 1, 0.3, 1);
    --easing-in: cubic-bezier(0.7, 0, 0.84, 0);
}

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

html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: 'Inter', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-base);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* App Background - Starfield Layer */
.app-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    background: var(--bg-base);
}

/* Starfield Canvas */
#starfield {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 3;
    display: block;
}

/* App Shell */
.app-shell {
    position: relative;
    z-index: 10;
    min-height: 100vh;
    padding: var(--spacing-6);
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

/* Brand Badge */
.brand-badge {
    position: fixed;
    top: var(--spacing-6);
    right: var(--spacing-6);
    z-index: 100;
    padding: 8px 14px;
    background: rgba(242, 245, 250, 0.10);
    border: 1px solid rgba(242, 245, 250, 0.16);
    border-radius: var(--radius-pill);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.brand-badge span {
    font-family: 'Inter', ui-sans-serif, system-ui, sans-serif;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-primary);
}

/* Top Navigation */
.top-nav {
    position: fixed;
    top: var(--spacing-6);
    left: 50%;
    transform: translateX(-50%);
    z-index: 100;
    display: flex;
    gap: var(--spacing-6);
    align-items: center;
}

.nav-link {
    font-family: 'Inter', ui-sans-serif, system-ui, sans-serif;
    font-size: 14px;
    font-weight: 500;
    line-height: 1.4;
    letter-spacing: 0em;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 6px 8px;
    transition: color var(--duration-base) var(--easing-standard),
                opacity var(--duration-base) var(--easing-standard),
                transform var(--duration-base) var(--easing-standard);
    border-radius: var(--radius-sm);
}

.nav-link:hover {
    color: rgba(242, 245, 250, 0.75);
    transform: translateY(-1px);
}

.nav-link:focus {
    outline: 2px solid var(--focus-ring);
    outline-offset: 3px;
}

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

/* Hero Section */
.hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    max-width: 980px;
    width: 100%;
    min-height: 100vh;
    padding: var(--spacing-6) 0;
}

/* Hero Title */
.hero-title {
    font-family: 'Poppins', 'Inter', ui-sans-serif, system-ui, sans-serif;
    font-size: 88px;
    font-weight: 800;
    line-height: 0.95;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: 18px;
    text-shadow: 0 8px 40px rgba(0, 0, 0, 0.55);
    transition: transform 0.1s ease-out;
    will-change: transform;
}

.hero-title-line {
    display: block;
}

/* Hero Subtitle */
.hero-subtitle {
    font-family: 'Inter', ui-sans-serif, system-ui, sans-serif;
    font-size: 16px;
    font-weight: 400;
    line-height: 1.6;
    letter-spacing: 0em;
    color: var(--text-muted);
    max-width: 520px;
    margin-bottom: var(--spacing-10);
    transition: transform 0.1s ease-out;
    will-change: transform;
}

/* Hero Actions */
.hero-actions {
    display: flex;
    gap: var(--spacing-4);
    flex-wrap: wrap;
    justify-content: center;
    margin-top: var(--spacing-6);
    transition: transform 0.1s ease-out;
    will-change: transform;
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: 'Inter', ui-sans-serif, system-ui, sans-serif;
    font-weight: 500;
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--duration-base) var(--easing-standard);
    cursor: pointer;
    border: none;
    outline: none;
}

.btn:focus {
    outline: 2px solid var(--focus-ring);
    outline-offset: 3px;
}

/* Button Sizes */
.btn-md {
    height: 44px;
    padding: 0 18px;
    font-size: 14px;
    border-radius: var(--radius-md);
}

/* Button Variants */
.btn-primary {
    background: rgba(242, 245, 250, 0.14);
    border: 1px solid rgba(242, 245, 250, 0.18);
    color: var(--text-primary);
}

.btn-primary:hover {
    background: rgba(242, 245, 250, 0.18);
    border-color: rgba(242, 245, 250, 0.24);
    transform: translateY(-1px);
}

.btn-ghost {
    background: transparent;
    border: 1px solid transparent;
    color: rgba(242, 245, 250, 0.78);
}

.btn-ghost:hover {
    background: rgba(242, 245, 250, 0.06);
    color: var(--text-primary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 56px;
    }
    
    .hero-subtitle {
        font-size: 14px;
    }
    
    .top-nav {
        gap: var(--spacing-4);
    }
    
    .nav-link {
        font-size: 13px;
    }
    
    .hero-actions {
        flex-direction: column;
        width: 100%;
        max-width: 280px;
    }
    
    .btn-md {
        width: 100%;
    }
    
    .brand-badge {
        top: var(--spacing-4);
        right: var(--spacing-4);
    }
    
    .top-nav {
        top: var(--spacing-4);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 40px;
    }
    
    .app-shell {
        padding: var(--spacing-4);
    }
}

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