/* LoRELEI Demo Website - Main Styles */

:root {
    /* Colors */
    --color-primary: #1e3a5f;
    --color-primary-light: #2d5a8a;
    --color-primary-dark: #0f2340;
    --color-accent: #22c55e;
    --color-accent-hover: #16a34a;

    --color-bg: #0a0f1a;
    --color-bg-secondary: #111827;
    --color-bg-tertiary: #1f2937;

    --color-text: #f3f4f6;
    --color-text-muted: #9ca3af;
    --color-text-dim: #6b7280;

    --color-border: #374151;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira 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;

    /* Borders */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

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

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
}

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

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

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--space-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: var(--space-md);
}

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

/* Header */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 15, 26, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-md) var(--space-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.main-header .logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.main-header .logo img {
    height: 50px;
    width: auto;
    filter: brightness(0) invert(1);
}

.main-header .logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.main-header nav {
    display: flex;
    gap: var(--space-lg);
}

.main-header nav a {
    color: var(--color-text-muted);
    font-weight: 500;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.main-header nav a:hover,
.main-header nav a.active {
    color: var(--color-text);
    background: var(--color-bg-tertiary);
}

/* Hero Section */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

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

.video-container video,
.video-container .video-placeholder {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-placeholder {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-placeholder-text {
    color: var(--color-text-dim);
    font-size: 1.25rem;
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        to bottom,
        rgba(10, 15, 26, 0.7) 0%,
        rgba(10, 15, 26, 0.5) 50%,
        rgba(10, 15, 26, 0.9) 100%
    );
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--space-xl);
}

.video-overlay .hero-logo {
    height: 800px;
    width: auto;
    max-width: 90vw;
    filter: brightness(0) invert(1);
    margin-bottom: var(--space-lg);
}

.video-overlay h1 {
    font-size: 4rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-md);
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.video-overlay .tagline {
    font-size: 1.5rem;
    color: var(--color-accent);
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.video-overlay .subtitle {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    max-width: 600px;
    margin-bottom: var(--space-xl);
}

.cta-button {
    display: inline-block;
    background: var(--color-accent);
    color: var(--color-bg);
    font-weight: 600;
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.cta-button:hover {
    background: var(--color-accent-hover);
    color: var(--color-bg);
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(34, 197, 94, 0.3);
}

/* Sections */
section {
    padding: var(--space-3xl) var(--space-lg);
}

section h2 {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

/* About Section */
.about-section {
    background: var(--color-bg-secondary);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-content p {
    font-size: 1.125rem;
    color: var(--color-text-muted);
}

/* Features Section */
.features-section {
    background: var(--color-bg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-xl);
    max-width: 1000px;
    margin: 0 auto;
}

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

.feature-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
}

.feature-card h3 {
    color: var(--color-accent);
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
}

.feature-card p {
    color: var(--color-text-muted);
    margin-bottom: 0;
}

/* Demos Section */
.demos-section {
    background: var(--color-bg-secondary);
}

.demos-section > p {
    text-align: center;
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
}

.demos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
    max-width: 800px;
    margin: 0 auto;
}

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

.demo-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.demo-card h3 {
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

.demo-card p {
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

.demo-cta {
    display: inline-block;
    color: var(--color-accent);
    font-weight: 600;
}

/* Contact Section */
.contact-section {
    background: var(--color-bg);
    text-align: center;
}

.contact-content {
    max-width: 500px;
    margin: 0 auto;
}

.contact-content p {
    color: var(--color-text-muted);
}

/* Footer */
footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--space-xl);
    text-align: center;
}

footer p {
    color: var(--color-text-dim);
    margin: 0;
}

/* Responsive */
@media (max-width: 768px) {
    .main-header {
        flex-direction: column;
        gap: var(--space-md);
        padding: var(--space-md);
    }

    .main-header nav {
        gap: var(--space-md);
    }

    .video-overlay .hero-logo {
        height: 300px;
    }

    .video-overlay h1 {
        font-size: 2.5rem;
    }

    .video-overlay .tagline {
        font-size: 1.25rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    section {
        padding: var(--space-2xl) var(--space-md);
    }
}