:root {
    /* Core Variables */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
    
    --transition-speed: 0.3s;
    --border-radius: 12px;
}

[data-theme="light"] {
    --bg-color: #f8f9fa;
    --text-color: #1a1a1a;
    --text-muted: #666;
    --accent-color: #6366f1; /* Indigo */
    --accent-hover: #4f46e5;
    --card-bg: rgba(255, 255, 255, 0.8);
    --border-color: rgba(0, 0, 0, 0.1);
    --code-bg: #e5e5e5;
    --hero-gradient: linear-gradient(135deg, #e0e7ff 0%, #f3e8ff 100%);
    --nav-bg: rgba(255, 255, 255, 0.8);
}

[data-theme="dark"] {
    --bg-color: #000000; /* Pure Black for OLED */
    --text-color: #e5e5e5;
    --text-muted: #a3a3a3;
    --accent-color: #06b6d4; /* Cyan */
    --accent-hover: #0891b2;
    --card-bg: rgba(20, 20, 20, 0.6);
    --border-color: rgba(255, 255, 255, 0.1);
    --code-bg: #111;
    --hero-gradient: radial-gradient(circle at top right, #1a1a1a 0%, #000000 100%);
    --nav-bg: rgba(0, 0, 0, 0.8);
}

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

body {
    font-family: var(--font-primary);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color var(--transition-speed), color var(--transition-speed);
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: 3.5rem; letter-spacing: -0.02em; }
h2 { font-size: 2.5rem; letter-spacing: -0.01em; }

a { text-decoration: none; color: inherit; transition: color 0.2s; }
ul { list-style: none; }

/* Utilities */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--accent-color);
    color: white;
}
[data-theme="light"] .btn-primary { color: #fff; }
[data-theme="dark"] .btn-primary { color: #000; } /* Text logic for contrast */

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3); /* Generic shadow, tweak per theme if needed */
}

.glass-panel {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 2rem;
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.25rem;
}

.logo img {
    height: 32px;
    width: auto;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

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

/* Theme Toggle */
.theme-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.5rem;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}
.theme-toggle:hover {
    background: var(--code-bg);
}

/* Hero Section */
.hero {
    padding-top: 140px;
    padding-bottom: 80px;
    background: var(--hero-gradient);
    min-height: 90vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-text h1 {
    margin-bottom: 1.5rem;
}

.hero-text p {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
    max-width: 500px;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.hero-img-container {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 20px 50px rgba(0,0,0,0.1);
    transform: perspective(1000px) rotateY(-5deg) rotateX(2deg);
    transition: transform 0.5s ease;
}
.hero-img-container:hover {
    transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
}
.hero-img-container img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
}

/* Features Grid */
.features {
    padding: 100px 0;
}
.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 4rem;
}
.section-header h2 { margin-bottom: 1rem; }
.section-header p { color: var(--text-muted); font-size: 1.1rem; }

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    padding: 2rem;
    transition: transform 0.3s;
}
.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-color);
}
.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    display: inline-block;
}

/* Code Preview */
.code-preview {
    background: #0d1117; /* GitHub Dark */
    padding: 1.5rem;
    border-radius: 12px;
    font-family: var(--font-mono);
    color: #c9d1d9;
    border: 1px solid #30363d;
    margin-top: 2rem;
    position: relative;
}
.code-preview::before {
    content: "Developer Preview";
    position: absolute;
    top: -12px;
    left: 20px;
    background: var(--accent-color);
    color: #000;
    font-size: 0.75rem;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-weight: bold;
}
.command-line {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}
.prompt { color: #79c0ff; user-select: none; }
.cmd { color: #d2a8ff; }
.comment { color: #8b949e; font-style: italic; }

/* Ecosystem */
.ecosystem-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}
.ecosystem-card {
    text-align: center;
}
.ecosystem-card h3 { margin-bottom: 0.5rem; }
.ecosystem-card p { font-size: 0.9rem; color: var(--text-muted); }

/* Download Section */
.download-section {
    padding: 100px 0;
    text-align: center;
    background: var(--code-bg);
}

/* Footer */
footer {
    padding: 4rem 0 2rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-muted);
}
.footer-logo {
    margin-bottom: 1rem;
    font-weight: 700;
    color: var(--text-color);
}

/* Responsive */
@media (max-width: 768px) {
    .h1 { font-size: 2.5rem; }
    .hero-content { grid-template-columns: 1fr; text-align: center; }
    .hero-text p { margin: 0 auto 2rem; }
    .nav-links { display: none; } /* Simplified for now */
    .ecosystem-grid { grid-template-columns: 1fr; }
}