/* ==========================================================================
   rootshell - Modern Static Website Styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
    /* Brand Colors - derived from logo */
    --color-primary: #0a84ff;
    --color-primary-dark: #0066cc;
    --color-primary-light: #40a9ff;
    --color-accent: #00d4ff;

    /* Background Colors */
    --color-bg-dark: #0a0e17;
    --color-bg-section: #0f1419;
    --color-bg-card: #161b22;
    --color-bg-card-hover: #1c232d;

    /* Text Colors */
    --color-text-primary: #f0f6fc;
    --color-text-secondary: #8b949e;
    --color-text-muted: #6e7681;

    /* Borders */
    --color-border: #21262d;
    --color-border-light: #30363d;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    --gradient-hero: radial-gradient(ellipse at bottom, #1a2744 0%, #0a0e17 70%);
    --gradient-card: linear-gradient(180deg, var(--color-bg-card) 0%, rgba(22, 27, 34, 0.8) 100%);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', Monaco, 'Cascadia Code', monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(10, 132, 255, 0.3);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;

    /* Layout */
    --max-width: 1200px;
    --nav-height: 64px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-dark);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--color-primary-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   Utility Classes
   -------------------------------------------------------------------------- */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.section-title {
    font-size: clamp(1.75rem, 5vw, 2.5rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--space-md);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--space-3xl);
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) var(--space-lg);
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 50px rgba(10, 132, 255, 0.4);
    color: white;
}

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

.btn-secondary:hover {
    background: var(--color-bg-card);
    border-color: var(--color-primary);
    color: var(--color-primary-light);
}

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

.btn-lg {
    padding: var(--space-md) var(--space-xl);
    font-size: 1rem;
}

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(10, 14, 23, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
}

.nav-container {
    max-width: var(--max-width);
    height: 100%;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-text-primary);
    font-weight: 600;
}

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

.nav-logo {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
}

.nav-title {
    font-family: var(--font-mono);
    font-size: 1.125rem;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav-links a:not(.btn) {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav-links a:not(.btn):hover {
    color: var(--color-text-primary);
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: calc(var(--nav-height) + var(--space-3xl)) var(--space-lg) var(--space-3xl);
    background: var(--gradient-hero);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: radial-gradient(circle at 2px 2px, rgba(255, 255, 255, 0.05) 1px, transparent 0);
    background-size: 40px 40px;
    pointer-events: none;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    position: relative;
    z-index: 1;
}

.hero-logo {
    width: 120px;
    height: 120px;
    margin: 0 auto var(--space-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.hero-title {
    font-family: var(--font-mono);
    font-size: clamp(2.5rem, 8vw, 4rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-md);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.beta-badge {
    display: inline-block;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: var(--space-xs) var(--space-md);
    background: rgba(255, 149, 0, 0.2);
    border: 1px solid rgba(255, 149, 0, 0.5);
    border-radius: var(--radius-full);
    color: #ff9500;
    -webkit-text-fill-color: #ff9500;
    vertical-align: middle;
    margin-left: var(--space-sm);
}

.hero-tagline {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    color: var(--color-text-primary);
    margin-bottom: var(--space-lg);
    font-weight: 500;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2xl);
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--space-2xl);
}

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

.platform-badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-xs) var(--space-md);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

/* --------------------------------------------------------------------------
   Screenshots Section
   -------------------------------------------------------------------------- */
.screenshots {
    padding: var(--space-4xl) 0;
    background: var(--color-bg-section);
}

.screenshot-gallery {
    display: grid;
    gap: var(--space-xl);
}

.screenshot-item {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    transition: all var(--transition-normal);
}

.screenshot-item:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.screenshot-item img {
    width: 100%;
    display: block;
}

.screenshot-item figcaption {
    padding: var(--space-md) var(--space-lg);
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    text-align: center;
    border-top: 1px solid var(--color-border);
}

.screenshot-item.featured {
    grid-column: 1 / -1;
}

.screenshot-section-title {
    font-size: 1.5rem;
    font-weight: 600;
    text-align: center;
    color: var(--color-text-primary);
    margin-top: var(--space-3xl);
    margin-bottom: var(--space-xl);
}

.screenshot-gallery-mobile {
    display: flex;
    justify-content: center;
    gap: var(--space-xl);
    flex-wrap: wrap;
}

.screenshot-mobile {
    max-width: 300px;
    flex: 0 1 300px;
}

.screenshot-mobile img {
    border-radius: var(--radius-xl);
}

@media (min-width: 768px) {
    .screenshot-gallery {
        grid-template-columns: repeat(2, 1fr);
    }

    .screenshot-item.featured {
        grid-column: 1 / -1;
    }
}

/* --------------------------------------------------------------------------
   Features Section
   -------------------------------------------------------------------------- */
.features {
    padding: var(--space-4xl) 0;
    background: var(--color-bg-dark);
}

.feature-grid {
    display: grid;
    gap: var(--space-lg);
}

@media (min-width: 640px) {
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .feature-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.feature-card {
    padding: var(--space-xl);
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
}

.feature-card:hover {
    border-color: var(--color-primary);
    background: var(--color-bg-card-hover);
    transform: translateY(-2px);
}

.feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(10, 132, 255, 0.1);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
}

.feature-icon svg {
    width: 24px;
    height: 24px;
    color: var(--color-primary-light);
}

.feature-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--color-text-primary);
}

.feature-card p {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* --------------------------------------------------------------------------
   Platforms Section
   -------------------------------------------------------------------------- */
.platforms {
    padding: var(--space-4xl) 0;
    background: var(--color-bg-section);
}

.platform-grid {
    display: grid;
    gap: var(--space-lg);
}

@media (min-width: 640px) {
    .platform-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .platform-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.platform-card {
    text-align: center;
    padding: var(--space-xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
}

.platform-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.platform-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(10, 132, 255, 0.1);
    border-radius: var(--radius-lg);
}

.platform-icon svg {
    width: 32px;
    height: 32px;
    color: var(--color-primary-light);
}

.platform-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.platform-card p {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
}

/* --------------------------------------------------------------------------
   Download Section
   -------------------------------------------------------------------------- */
.download {
    padding: var(--space-4xl) 0;
    background: var(--gradient-hero);
    text-align: center;
}

.app-store-badge {
    display: inline-block;
    transition: transform var(--transition-normal);
}

.app-store-badge:hover {
    transform: scale(1.05);
}

.app-store-badge img {
    height: 54px;
    width: auto;
}

.download-options {
    display: flex;
    justify-content: center;
    gap: var(--space-xl);
    flex-wrap: wrap;
    margin-bottom: var(--space-3xl);
}

.download-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-xl) var(--space-2xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    max-width: 400px;
    transition: all var(--transition-normal);
    text-decoration: none;
    color: inherit;
}

.download-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    color: inherit;
}

.download-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--color-text-primary);
}

.download-card p {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
    text-align: center;
}

.download-card .btn {
    pointer-events: none;
}

.download-notes {
    max-width: 700px;
    margin: 0 auto;
    padding: var(--space-xl);
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    text-align: left;
}

.download-notes h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-md);
}

.download-notes p {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
    line-height: 1.6;
}

.download-notes ul {
    list-style: none;
    padding: 0;
    margin-bottom: var(--space-md);
}

.download-notes li {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    padding: var(--space-sm) 0;
    padding-left: var(--space-lg);
    position: relative;
    line-height: 1.6;
}

.download-notes li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.875rem;
    width: 6px;
    height: 6px;
    background: var(--color-primary);
    border-radius: 50%;
}

.download-notes li strong {
    color: var(--color-text-primary);
}

.download-notes p:last-child {
    margin-bottom: 0;
}

.download-notes-warning {
    border-color: rgba(234, 179, 8, 0.5);
    background: rgba(234, 179, 8, 0.1);
    margin-bottom: var(--space-xl);
}

.download-notes-warning h3 {
    color: rgb(250, 204, 21);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
    padding: var(--space-2xl) 0;
    background: var(--color-bg-dark);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-lg);
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.footer-logo {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
}

.footer-title {
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-md) var(--space-xl);
}

.footer-links a {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.footer-links a:hover {
    color: var(--color-primary-light);
}

.footer-copyright {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Mobile Navigation
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
}

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

    html {
        scroll-behavior: auto;
    }
}