/* ============================================
   Digital Telomere - Biopunk Informatics
   ============================================ */

/* --- Custom Properties --- */
:root {
    --deep-void: #0a0b14;
    --chromosome-dark: #111225;
    --telomere-teal: #00e5c7;
    --fluorescence-magenta: #e6007e;
    --phosphor-blue: #c4deff;
    --nucleotide-gold: #f5b942;
    --centromere-white: #f0f2f8;
    --gel-green: #39ff8e;

    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Newsreader', serif;
    --font-mono: 'IBM Plex Mono', monospace;

    --ease-bio: cubic-bezier(0.22, 1.0, 0.36, 1.0);
}

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    background-color: var(--deep-void);
    color: var(--phosphor-blue);
    font-family: var(--font-body);
    font-size: clamp(1rem, 1.2vw, 1.2rem);
    line-height: 1.75;
    overflow-x: hidden;
}

/* --- Telomere Caps --- */
.telomere-cap {
    height: 80px;
    position: relative;
    z-index: 1;
}

#telomere-cap-top {
    background: linear-gradient(180deg, #00e5c7 0%, #00e5c7 10%, transparent 100%);
}

#telomere-cap-bottom {
    background: linear-gradient(0deg, #00e5c7 0%, #00e5c7 10%, transparent 100%);
}

/* --- Bands (Sections) --- */
.band {
    position: relative;
    min-height: 100vh;
    overflow: hidden;
}

.band-dark {
    background-color: var(--deep-void);
    background-image:
        repeating-linear-gradient(
            0deg,
            rgba(255,255,255,0.02) 0px,
            rgba(255,255,255,0.02) 2px,
            transparent 2px,
            transparent 8px
        ),
        repeating-linear-gradient(
            0deg,
            rgba(255,255,255,0.04) 0px,
            rgba(255,255,255,0.04) 3px,
            transparent 3px,
            transparent 14px
        );
}

.band-lighter {
    background-color: var(--chromosome-dark);
    background-image:
        repeating-linear-gradient(
            0deg,
            rgba(255,255,255,0.03) 0px,
            rgba(255,255,255,0.03) 2px,
            transparent 2px,
            transparent 10px
        ),
        repeating-linear-gradient(
            0deg,
            rgba(255,255,255,0.05) 0px,
            rgba(255,255,255,0.05) 4px,
            transparent 4px,
            transparent 16px
        );
}

/* --- Section Divider Lines --- */
.section-line {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0%;
    height: 1px;
    background-color: rgba(0, 229, 199, 0.2);
    transition: width 400ms var(--ease-bio);
    z-index: 5;
}

.section-line.visible {
    width: 100%;
}

/* --- Hero Section --- */
#hero {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    position: relative;
}

#nucleotide-rain-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s var(--ease-bio);
    z-index: 1;
    pointer-events: none;
}

#nucleotide-rain-canvas.active {
    opacity: 0.18;
}

#hero-content {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

#helix-intro-container {
    width: 200px;
    height: 320px;
    position: relative;
    margin-bottom: 2rem;
}

#helix-canvas {
    width: 100%;
    height: 100%;
}

.hero-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2.5rem, 6vw, 5rem);
    color: var(--centromere-white);
    letter-spacing: 0.08em;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 800ms var(--ease-bio), transform 800ms var(--ease-bio);
}

.hero-title.visible {
    opacity: 1;
    transform: translateY(0);
}

.hero-subtitle {
    font-family: var(--font-body);
    font-style: italic;
    font-weight: 400;
    font-size: 1.1rem;
    color: var(--phosphor-blue);
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 800ms var(--ease-bio) 300ms, transform 800ms var(--ease-bio) 300ms;
}

.hero-subtitle.visible {
    opacity: 0.8;
    transform: translateY(0);
}

.scroll-indicator {
    position: absolute;
    bottom: -120px;
    opacity: 0;
    animation: none;
    transition: opacity 600ms var(--ease-bio);
}

.scroll-indicator.visible {
    opacity: 0.5;
    animation: chevron-pulse 2s ease-in-out infinite;
}

@keyframes chevron-pulse {
    0%, 100% { transform: translateY(0); opacity: 0.5; }
    50% { transform: translateY(6px); opacity: 0.3; }
}

/* --- Mini Helix (Persistent Corner Element) --- */
#mini-helix-container {
    position: fixed;
    top: 20px;
    left: 20px;
    width: 80px;
    height: 130px;
    z-index: 100;
    opacity: 0;
    transform: scale(0.8);
    transition: opacity 500ms var(--ease-bio), transform 500ms var(--ease-bio);
    pointer-events: none;
}

#mini-helix-container.visible {
    opacity: 1;
    transform: scale(1);
}

#mini-helix-canvas {
    width: 80px;
    height: 100px;
}

#helix-health-label {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    color: var(--telomere-teal);
    opacity: 0.7;
    letter-spacing: 0.04em;
    text-align: center;
    margin-top: 4px;
}

/* --- Chromosome Navigation --- */
#chromosome-nav {
    position: fixed;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 99;
    display: flex;
    flex-direction: column;
    gap: 12px;
    opacity: 0;
    transition: opacity 500ms var(--ease-bio);
}

#chromosome-nav.visible {
    opacity: 1;
}

.chromo-marker {
    cursor: pointer;
    color: rgba(196, 222, 255, 0.4);
    transition: color 400ms var(--ease-bio), filter 400ms var(--ease-bio);
}

.chromo-marker.active {
    color: var(--telomere-teal);
    filter: drop-shadow(0 0 6px rgba(0, 229, 199, 0.5));
}

.chromo-marker.visited {
    color: rgba(196, 222, 255, 0.4);
}

.chromo-icon {
    display: block;
}

/* --- Scroll Progress Bar --- */
#scroll-progress {
    position: fixed;
    right: 12px;
    top: 10%;
    height: 80%;
    width: 6px;
    z-index: 100;
    opacity: 0;
    transition: opacity 500ms var(--ease-bio);
}

#scroll-progress.visible {
    opacity: 1;
}

#scroll-progress-track {
    width: 100%;
    height: 100%;
    background: rgba(196, 222, 255, 0.08);
    border-radius: 3px;
    position: relative;
    overflow: hidden;
}

#scroll-progress-track::before,
#scroll-progress-track::after {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
    height: 12px;
    border-radius: 3px;
}

#scroll-progress-track::before {
    top: 0;
    background: linear-gradient(180deg, var(--telomere-teal), transparent);
}

#scroll-progress-track::after {
    bottom: 0;
    background: linear-gradient(0deg, var(--telomere-teal), transparent);
}

#scroll-progress-marker {
    width: 6px;
    height: 16px;
    background: var(--telomere-teal);
    border-radius: 3px;
    position: absolute;
    top: 0;
    left: 0;
    box-shadow: 0 0 8px rgba(0, 229, 199, 0.6), 0 0 16px rgba(0, 229, 199, 0.3);
    transition: top 100ms linear;
}

/* --- Band Grid (Dual-Rail) --- */
.band-grid {
    display: grid;
    grid-template-columns: minmax(200px, 1fr) minmax(400px, 3fr);
    min-height: 100vh;
    padding: 6rem 3rem 6rem 80px;
    gap: 3rem;
    align-items: start;
    align-content: center;
}

/* --- Meta Rail --- */
.meta-rail {
    position: sticky;
    top: 6rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    opacity: 0;
    transform: translateX(-20px);
    transition: opacity 500ms var(--ease-bio), transform 500ms var(--ease-bio);
}

.meta-rail.visible {
    opacity: 1;
    transform: translateX(0);
}

.meta-block {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.mono-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 400;
    color: var(--telomere-teal);
    opacity: 0.7;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.mono-value {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--phosphor-blue);
    letter-spacing: 0.04em;
}

/* --- Telomere Length Indicator --- */
.telomere-indicator {
    margin-top: 0.5rem;
    height: 10px;
    display: flex;
    align-items: center;
}

.telomere-bar {
    display: flex;
    gap: 3px;
    height: 8px;
}

/* Rungs created via JS */
.telomere-rung {
    width: 2px;
    height: 8px;
    border-radius: 1px;
    transition: background-color 600ms var(--ease-bio);
}

/* --- Content Rail --- */
.content-rail {
    max-width: 720px;
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 600ms var(--ease-bio) 200ms, transform 600ms var(--ease-bio) 200ms;
}

.content-rail.visible {
    opacity: 1;
    transform: translateY(0);
}

.band-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2rem, 5vw, 4rem);
    color: var(--centromere-white);
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.band-text {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(1rem, 1.2vw, 1.2rem);
    color: var(--phosphor-blue);
    line-height: 1.75;
    margin-bottom: 1.5rem;
}

/* --- Data Highlights --- */
.data-highlight {
    display: inline-flex;
    flex-direction: column;
    gap: 4px;
    padding: 1.2rem 1.8rem;
    margin-top: 1rem;
    border: 1px solid rgba(0, 229, 199, 0.15);
    border-radius: 4px;
    background: radial-gradient(circle at center, rgba(0, 229, 199, 0.05) 0%, transparent 70%);
    position: relative;
}

.data-value {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 2rem;
    color: var(--telomere-teal);
    letter-spacing: -0.02em;
}

.data-value[data-glow] {
    text-shadow: 0 0 8px rgba(0, 229, 199, 0.4);
}

.data-caption {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 0.95rem;
    color: var(--phosphor-blue);
    opacity: 0.7;
}

/* --- Fluorescence Glow Effect --- */
.data-highlight:hover {
    border-color: rgba(0, 229, 199, 0.35);
    box-shadow:
        0 0 4px var(--telomere-teal),
        0 0 12px rgba(0, 229, 199, 0.3),
        0 0 24px rgba(0, 229, 199, 0.1);
}

.data-highlight:hover .data-value {
    text-shadow: 0 0 12px rgba(0, 229, 199, 0.6), 0 0 24px rgba(230, 0, 126, 0.2);
}

/* --- Terminal Band (Band 6) --- */
.band-terminal {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.terminal-content {
    text-align: center;
    max-width: 680px;
    padding: 4rem 2rem;
    position: relative;
    z-index: 2;
}

#terminal-helix-canvas {
    width: 120px;
    height: 200px;
    margin: 0 auto 2rem;
    display: block;
}

.terminal-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.8rem, 4vw, 3rem);
    color: var(--centromere-white);
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
    line-height: 1.15;
}

.terminal-text {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(1rem, 1.2vw, 1.15rem);
    color: var(--phosphor-blue);
    line-height: 1.8;
    margin-bottom: 1.2rem;
    opacity: 0.85;
}

/* --- Cursor Trail Canvas --- */
#cursor-trail-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
}

/* --- Link Styles --- */
a {
    color: var(--phosphor-blue);
    text-decoration: none;
    border-bottom: 1px solid rgba(0, 229, 199, 0.4);
    transition: color 300ms var(--ease-bio), border-bottom-width 300ms var(--ease-bio), border-bottom-color 300ms var(--ease-bio);
}

a:hover {
    color: var(--centromere-white);
    border-bottom: 2px solid var(--telomere-teal);
    text-shadow: 0 0 8px rgba(0, 229, 199, 0.3);
}

/* --- Mobile Responsive --- */
@media (max-width: 768px) {
    .band-grid {
        grid-template-columns: 1fr;
        padding: 4rem 1.5rem 4rem 1.5rem;
        gap: 2rem;
    }

    .meta-rail {
        position: relative;
        top: auto;
        flex-direction: row;
        flex-wrap: wrap;
        gap: 1rem;
        padding: 1rem;
        background: rgba(0, 229, 199, 0.03);
        border: 1px solid rgba(0, 229, 199, 0.08);
        border-radius: 4px;
    }

    #chromosome-nav {
        display: none;
    }

    #mini-helix-container {
        width: 50px;
        height: 90px;
        top: 10px;
        left: 10px;
    }

    #mini-helix-canvas {
        width: 50px;
        height: 70px;
    }

    #helix-health-label {
        font-size: 0.5rem;
    }

    #scroll-progress {
        right: 6px;
        width: 4px;
    }
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}