:root {
    --bg-dark: #000000;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent-primary: #cbd5e1; /* Steel Silver */
    --accent-secondary: #3b82f6; /* Combustion Blue */
    --card-bg: #0a0a0a;
    --border-color: #1e293b;
    --font-header: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.7;
    overflow-x: hidden;
}

.home-nav {
    padding: 2rem;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
}

.home-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 2px;
    transition: color 0.3s ease;
    text-transform: uppercase;
}

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

header {
    height: 80vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 2rem;
    background: linear-gradient(to bottom, #0a0a0a, #000000);
    position: relative;
    overflow: hidden;
}

header h1 {
    font-family: var(--font-header);
    font-size: clamp(3rem, 12vw, 8rem);
    font-weight: 800;
    margin-bottom: 1rem;
    color: #fff;
    letter-spacing: -4px;
    text-transform: uppercase;
}

header p {
    max-width: 600px;
    color: var(--text-secondary);
    font-size: 1.25rem;
    font-weight: 300;
}

.hero-canvas-container {
    width: 100%;
    height: 400px;
    background: #000;
    position: relative;
}

#hero-spacex-canvas {
    width: 100%;
    height: 100%;
}

main {
    max-width: 850px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

section {
    margin-bottom: 10rem;
}

h2 {
    font-family: var(--font-header);
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: #fff;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: -1px;
}

p {
    margin-bottom: 1.5rem;
    font-size: 1.15rem;
    color: var(--text-secondary);
}

strong {
    color: #fff;
    font-weight: 600;
}

.toc {
    background: var(--card-bg);
    padding: 3rem;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    margin: -120px auto 6rem;
    max-width: 750px;
    position: relative;
    z-index: 10;
    box-shadow: 0 30px 60px -12px rgba(0, 0, 0, 0.8);
}

.toc-title {
    font-family: var(--font-header);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 4px;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    display: block;
}

.toc ol {
    list-style: none;
}

.toc-part {
    font-size: 0.7rem;
    font-weight: 800;
    color: var(--accent-secondary);
    margin: 2rem 0 0.5rem;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.toc a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    display: block;
    padding: 0.6rem 0;
    transition: all 0.2s ease;
    border-bottom: 1px solid transparent; 
    width: fit-content;
}

.toc a:hover {
    color: #fff;
    transform: translateX(10px);
}

.interactive-container {
    background: #050505;
    border: 1px solid #111;
    padding: 2.5rem;
    margin: 4rem 0;
    border-radius: 8px;
}

.visual-label {
    font-size: 0.7rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    margin-bottom: 2rem;
    letter-spacing: 3px;
    font-weight: 700;
}

canvas {
    width: 100%;
    background: #000;
    display: block;
    margin-bottom: 2rem;
    border-radius: 4px;
}

.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 3rem;
    padding-top: 2.5rem;
    border-top: 1px solid #111;
}

.slider-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    flex: 1;
    min-width: 200px;
}

.slider-group label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

input[type="range"] {
    appearance: none;
    background: #111;
    height: 4px;
    border-radius: 2px;
}

input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    background: #fff;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.3);
}

.action-btn {
    background: #fff;
    color: #000;
    border: none;
    padding: 1rem 2.5rem;
    font-family: var(--font-header);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.action-btn:hover {
    background: var(--accent-secondary);
    color: #fff;
    transform: translateY(-2px);
}

footer {
    padding: 8rem 2rem;
    text-align: center;
    border-top: 1px solid #111;
    font-size: 0.7rem;
    color: #444;
    letter-spacing: 4px;
    text-transform: uppercase;
}

@media (max-width: 768px) {
    header { height: 70vh; }
    .toc { margin: -60px 1.5rem 4rem; padding: 2rem; }
    .controls { flex-direction: column; gap: 2rem; }
}