/* ============================================
   CSS Variables
   ============================================ */

:root {
    /* Dark Mode (Default) */
    --bg-primary: #020617;
    --bg-secondary: #0f172a;
    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --gradient-start: #6366f1;
    --gradient-end: #d946ef;
    --glow-color: rgba(99, 102, 241, 0.15);
    --border-color: rgba(148, 163, 184, 0.1);
    --code-bg: #1e293b;
    
    /* Spacing */
    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 24px;
    --space-lg: 32px;
    --space-xl: 48px;
    --space-2xl: 64px;
    
    /* Border Radius */
    --radius-card: 24px;
    --radius-pill: 100px;
    
    /* Typography - Source (Adobe's clean system) */
    --font-heading: 'Source Serif 4', Georgia, serif;
    --font-body: 'Source Sans 3', -apple-system, sans-serif;
}

[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --text-primary: #1e1b4b;
    --text-secondary: #4338ca;
    --border-color: rgba(99, 102, 241, 0.1);
    --code-bg: #f1f5f9;
    --glow-color: rgba(99, 102, 241, 0.05);
}

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

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 18px;
    line-height: 1.65;
    color: var(--text-secondary);
    background: var(--bg-primary);
    transition: background 0.3s ease, color 0.3s ease;
}

/* Atmospheric Glow Background */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: 50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, var(--glow-color) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
    transform: translateX(-50%);
}

/* ============================================
   Layout Components
   ============================================ */

/* Canvas Background - Full Page */
.background-canvas-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    background: var(--bg-primary);
    transition: background 0.3s ease;
}

#background-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
    opacity: 0.6;
}

[data-theme="light"] #background-canvas {
    opacity: 0.4;
}

/* Container */
.container {
    position: relative;
    z-index: 1;
    max-width: min(1200px, 90vw);
    margin: 0 auto;
    padding: clamp(1rem, 4vw, 3rem) clamp(1.5rem, 5vw, 2rem);
}

/* Navigation */
.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-2xl);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--border-color);
}

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

.site-logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 0;
    color: var(--text-primary);
    text-decoration: none;
}

.nav-links a:not(.site-logo) {
    font-family: var(--font-body);
    font-size: 16px;
    font-weight: 400;
    color: var(--text-secondary);
    text-decoration: none;
    opacity: 0.8;
    transition: all 0.3s ease;
}

.nav-links a:not(.site-logo):hover {
    opacity: 1;
    color: var(--text-primary);
}

.theme-toggle {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-pill);
    padding: var(--space-xs) var(--space-md);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.theme-toggle:hover {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    transform: scale(1.05);
}

/* Hero Section */
.hero {
    min-height: 60vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    margin-bottom: var(--space-2xl);
    padding: clamp(2rem, 8vw, 4rem) clamp(1.5rem, 5vw, 3rem);
    position: relative;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 7vw, 4.5rem);
    font-weight: 600;
    letter-spacing: -0.01em;
    line-height: 1.15;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
    animation: fadeInUp 0.8s ease forwards;
}

.hero-subtitle {
    font-family: var(--font-body);
    font-size: clamp(1.0625rem, 2vw, 1.375rem);
    color: var(--text-secondary);
    max-width: 600px;
    line-height: 1.6;
    opacity: 0;
    animation: fadeInUp 0.8s ease 0.2s forwards;
}

.hero-cta {
    margin-top: var(--space-lg);
    opacity: 0;
    animation: fadeInUp 0.8s ease 0.4s forwards;
}

.cta-button {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    border: none;
    border-radius: var(--radius-pill);
    padding: var(--space-md) var(--space-xl);
    font-family: var(--font-body);
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    box-shadow: 0 4px 24px rgba(99, 102, 241, 0.3);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(99, 102, 241, 0.4);
}

.scroll-indicator {
    position: absolute;
    bottom: var(--space-lg);
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    animation: fadeInUp 0.8s ease 0.6s forwards, bounce 2s ease-in-out 1.4s infinite;
}

.scroll-indicator svg {
    width: 24px;
    height: 24px;
    stroke: var(--text-secondary);
    opacity: 0.6;
}

/* ============================================
   Content Components
   ============================================ */

/* Tagline */
.tagline {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    opacity: 0.9;
}

/* Section Headers */
h1 {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 600;
    letter-spacing: -0.01em;
    line-height: 1.25;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
}

/* Services Grid */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: clamp(1rem, 3vw, 2rem);
    margin-bottom: var(--space-2xl);
}

/* Service Cards */
.service-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-card);
    padding: clamp(1rem, 2.5vw, 1.5rem);
    transition: all 0.3s ease;
    animation: fadeInUp 0.6s ease forwards;
    opacity: 0;
}

.service-card:nth-child(1) { animation-delay: 0.1s; }
.service-card:nth-child(2) { animation-delay: 0.2s; }
.service-card:nth-child(3) { animation-delay: 0.3s; }

.service-card:hover {
    transform: translateY(-4px);
    border-color: var(--gradient-start);
    box-shadow: 0 8px 32px rgba(99, 102, 241, 0.2);
}

.service-title {
    font-family: var(--font-heading);
    font-size: clamp(1.125rem, 2.5vw, 1.5rem);
    font-weight: 600;
    letter-spacing: -0.01em;
    line-height: 1.3;
    margin-bottom: clamp(0.5rem, 1.5vw, 0.75rem);
    color: var(--text-primary);
}

.service-description {
    color: var(--text-secondary);
    line-height: 1.5;
    font-size: clamp(0.875rem, 1.75vw, 1rem);
}

/* Footer */
.footer {
    margin-top: var(--space-2xl);
    padding-top: var(--space-lg);
    padding-bottom: var(--space-xl);
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-secondary);
    opacity: 0.6;
    font-size: 14px;
}

/* Version Badge */
.version-badge {
    position: fixed;
    top: var(--space-md);
    right: var(--space-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-pill);
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    z-index: 1000;
}

/* ============================================
   Animations
   ============================================ */

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   Responsive Styles
   ============================================ */

@media (max-width: 768px) {
    .nav {
        flex-direction: column;
        gap: var(--space-md);
        align-items: flex-start;
    }

    .nav-links {
        width: 100%;
        flex-wrap: wrap;
    }

    .theme-toggle {
        align-self: flex-end;
    }

    .hero {
        min-height: 50vh;
        padding: clamp(1.5rem, 6vw, 3rem) clamp(1rem, 4vw, 2rem);
    }

    body {
        font-size: 17px;
    }

    .version-badge {
        top: var(--space-sm);
        right: var(--space-sm);
    }

    .services-grid {
        grid-template-columns: 1fr;
        gap: clamp(1rem, 4vw, 1.5rem);
    }

    .service-card {
        padding: clamp(1rem, 3vw, 1.25rem);
    }
}