/* === RESET & BASE === */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --chrome-light: #E8E8F0;
    --void-black: #0D0D12;
    --amber-glow: #F5A623;
    --deep-surface: #18181F;
    --mid-surface: #2A2A3A;
    --electric-blue: #3D5AFE;
    --chrome-mid: #C0C0C8;
    --muted-text: #7B7B9A;
    --accent-orange: #FF7E3D;
}

html {
    scroll-behavior: smooth;
}

body {
    background: var(--void-black);
    color: var(--chrome-light);
    font-family: 'Space Grotesk', sans-serif;
    font-size: 17px;
    line-height: 1.65;
    overflow-x: hidden;
}

/* === NOISE OVERLAY === */
.noise-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* === MAIN CONTAINER === */
#main-container {
    perspective: 1200px;
}

/* === CHAPTER BASE === */
.chapter {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: 4rem 2rem;
}

.chapter-label {
    font-family: 'Jost', sans-serif;
    font-weight: 900;
    font-size: 12px;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--muted-text);
    position: absolute;
    top: 3rem;
    left: 3rem;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.chapter.visible .chapter-label {
    opacity: 1;
    transform: translateY(0);
}

/* === CHAPTER 1: THRESHOLD === */
.chapter-threshold {
    background: radial-gradient(ellipse at center, #1a1a2e 0%, var(--void-black) 70%);
}

.chrome-sphere {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    position: relative;
    background: conic-gradient(from 0deg, #3a3a4a, #c0c0c8, #5a5a6a, #e8e8f0, #3a3a4a);
    animation: sphere-rotate 8s linear infinite;
    box-shadow:
        0 0 80px rgba(61, 90, 254, 0.2),
        inset 0 0 60px rgba(0, 0, 0, 0.5);
}

.sphere-inner {
    position: absolute;
    inset: 15%;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.3), transparent 60%);
}

.sphere-highlight {
    position: absolute;
    top: 15%;
    left: 25%;
    width: 30%;
    height: 20%;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    filter: blur(8px);
}

@keyframes sphere-rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.title-warped {
    font-family: 'Jost', sans-serif;
    font-weight: 900;
    font-size: clamp(48px, 12vw, 96px);
    letter-spacing: -0.03em;
    text-transform: uppercase;
    margin-top: 2rem;
    background: linear-gradient(135deg, var(--chrome-light), var(--chrome-mid), var(--electric-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 19px;
    color: var(--muted-text);
    margin-top: 0.5rem;
}

.scroll-indicator {
    position: absolute;
    bottom: 3rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    animation: float 2s ease-in-out infinite;
}

.scroll-text {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 12px;
    color: var(--muted-text);
    text-transform: uppercase;
    letter-spacing: 0.2em;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid var(--electric-blue);
    border-bottom: 2px solid var(--electric-blue);
    transform: rotate(45deg);
}

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

/* === CHAPTER 2: LABORATORY === */
.chapter-laboratory {
    background: var(--deep-surface);
    padding: 6rem 2rem;
}

.collage-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    max-width: 1000px;
    width: 100%;
    margin-top: 2rem;
}

.collage-panel {
    background: linear-gradient(145deg, var(--mid-surface), var(--deep-surface));
    border: 1px solid rgba(192, 192, 200, 0.1);
    border-radius: 12px;
    padding: 2.5rem;
    position: relative;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.collage-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--electric-blue), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.collage-panel:hover::before {
    opacity: 1;
}

.collage-panel h2 {
    font-family: 'Jost', sans-serif;
    font-weight: 700;
    font-size: 24px;
    margin-bottom: 0.75rem;
    color: var(--chrome-light);
}

.collage-panel p {
    color: var(--muted-text);
    font-size: 15px;
    line-height: 1.6;
}

.chrome-frame {
    position: absolute;
    top: -1px;
    right: -1px;
    width: 40px;
    height: 40px;
    border-top: 2px solid var(--chrome-mid);
    border-right: 2px solid var(--chrome-mid);
    border-radius: 0 12px 0 0;
    opacity: 0.3;
}

/* Candle Glow Effects */
.candle-glow {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
    filter: blur(80px);
}

.candle-glow-1 {
    width: 300px;
    height: 300px;
    background: rgba(245, 166, 35, 0.08);
    bottom: -100px;
    left: -100px;
}

.candle-glow-2 {
    width: 200px;
    height: 200px;
    background: rgba(255, 126, 61, 0.06);
    top: 20%;
    right: -50px;
}

.candle-glow-3 {
    width: 250px;
    height: 250px;
    background: rgba(245, 166, 35, 0.07);
    bottom: 10%;
    left: 10%;
}

/* === CHAPTER 3: ENGINE ROOM === */
.chapter-engine {
    background: var(--void-black);
    padding: 6rem 2rem;
}

.engine-content {
    display: flex;
    gap: 3rem;
    max-width: 1100px;
    width: 100%;
    align-items: flex-start;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 2rem;
}

.chrome-terminal {
    background: var(--deep-surface);
    border: 1px solid rgba(192, 192, 200, 0.15);
    border-radius: 12px;
    overflow: hidden;
    flex: 1;
    min-width: 400px;
    max-width: 600px;
}

.terminal-bar {
    background: var(--mid-surface);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.terminal-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--muted-text);
}

.terminal-dot:first-child { background: #ff5f56; }
.terminal-dot:nth-child(2) { background: #ffbd2e; }
.terminal-dot:nth-child(3) { background: #27ca40; }

.terminal-title {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 12px;
    color: var(--muted-text);
    margin-left: auto;
}

.terminal-body {
    padding: 1.5rem;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 14px;
    line-height: 1.8;
}

.code-line {
    display: block;
    min-height: 1.8em;
}

.code-keyword { color: var(--electric-blue); }
.code-string { color: var(--amber-glow); }
.code-number { color: var(--accent-orange); }

.metrics-panel {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    padding: 2.5rem;
    background: linear-gradient(145deg, var(--mid-surface), var(--deep-surface));
    border: 1px solid rgba(192, 192, 200, 0.1);
    border-radius: 12px;
    min-width: 280px;
}

.metric {
    display: flex;
    flex-direction: column;
}

.metric-value {
    font-family: 'Jost', sans-serif;
    font-weight: 900;
    font-size: 48px;
    color: var(--chrome-light);
    line-height: 1;
}

.metric-unit {
    font-family: 'Jost', sans-serif;
    font-weight: 700;
    font-size: 24px;
    color: var(--electric-blue);
}

.metric-label {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 12px;
    color: var(--muted-text);
    margin-top: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* === CHAPTER 4: OBSERVATORY === */
.chapter-observatory {
    background: var(--deep-surface);
    padding: 6rem 2rem;
}

.observatory-content {
    max-width: 900px;
    width: 100%;
    margin-top: 2rem;
}

.testimonial-card {
    background: linear-gradient(145deg, var(--mid-surface), rgba(13, 13, 18, 0.8));
    border: 1px solid rgba(192, 192, 200, 0.08);
    border-radius: 12px;
    padding: 2.5rem;
    margin-bottom: 2rem;
    position: relative;
}

.testimonial-card::after {
    content: '"';
    position: absolute;
    top: 1rem;
    right: 2rem;
    font-family: 'Jost', sans-serif;
    font-size: 80px;
    color: rgba(61, 90, 254, 0.1);
    line-height: 1;
}

.testimonial-card blockquote {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 18px;
    font-style: italic;
    color: var(--chrome-light);
    line-height: 1.7;
    margin-bottom: 1rem;
}

.testimonial-card cite {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 13px;
    color: var(--muted-text);
    font-style: normal;
}

.use-cases {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 3rem;
}

.use-case {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 13px;
    padding: 0.75rem 1.5rem;
    border: 1px solid rgba(192, 192, 200, 0.15);
    border-radius: 100px;
    color: var(--chrome-mid);
    transition: border-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
}

.use-case:hover {
    border-color: var(--electric-blue);
    color: var(--chrome-light);
    box-shadow: 0 0 20px rgba(61, 90, 254, 0.15);
}

/* === CHAPTER 5: PORTAL === */
.chapter-portal {
    background: radial-gradient(ellipse at center, #1a1a2e 0%, var(--void-black) 70%);
    text-align: center;
}

.portal-content {
    position: relative;
    z-index: 2;
}

.portal-heading {
    font-family: 'Jost', sans-serif;
    font-weight: 900;
    font-size: clamp(36px, 6vw, 72px);
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--chrome-light), var(--amber-glow));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.portal-text {
    font-size: 18px;
    color: var(--muted-text);
    max-width: 500px;
    margin: 0 auto 2.5rem;
}

.cta-button {
    display: inline-block;
    position: relative;
    padding: 1rem 3rem;
    font-family: 'Jost', sans-serif;
    font-weight: 700;
    font-size: 16px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    text-decoration: none;
    color: var(--void-black);
    background: linear-gradient(135deg, var(--electric-blue), #6979ff);
    border-radius: 100px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    overflow: hidden;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 40px rgba(61, 90, 254, 0.4);
}

.cta-glow {
    position: absolute;
    inset: -2px;
    border-radius: 100px;
    background: linear-gradient(135deg, var(--electric-blue), var(--amber-glow));
    z-index: -1;
    filter: blur(12px);
    opacity: 0.5;
}

.portal-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 500px;
    height: 500px;
    border-radius: 50%;
    border: 1px solid rgba(61, 90, 254, 0.1);
    animation: ring-pulse 4s ease-in-out infinite;
}

.portal-ring-2 {
    width: 650px;
    height: 650px;
    animation-delay: 1s;
}

.portal-ring-3 {
    width: 800px;
    height: 800px;
    animation-delay: 2s;
}

@keyframes ring-pulse {
    0%, 100% { opacity: 0.3; transform: translate(-50%, -50%) scale(1); }
    50% { opacity: 0.6; transform: translate(-50%, -50%) scale(1.03); }
}

/* === TILT CARD 3D === */
.tilt-card {
    transform-style: preserve-3d;
    transition: transform 0.15s ease-out;
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
    .collage-grid {
        grid-template-columns: 1fr;
    }

    .engine-content {
        flex-direction: column;
        align-items: center;
    }

    .chrome-terminal {
        min-width: unset;
        width: 100%;
    }

    .chapter-label {
        top: 2rem;
        left: 2rem;
    }

    .chrome-sphere {
        width: 200px;
        height: 200px;
    }
}