/* === xanadu.science — Underwater Meditation Garden === */

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

:root {
    --sand: #dbc4a0;
    --cream: #f5ede0;
    --parchment: #f2e8d8;
    --deep-brown: #3d2b1f;
    --reef-green: #5a8f7b;
    --amber: #d4a552;
    --warm-brown: #5c4a3a;
    --terracotta: #c4724e;
}

html {
    scroll-behavior: smooth;
    scroll-snap-type: y mandatory;
}

body {
    font-family: 'Inter', sans-serif;
    font-weight: 400;
    color: var(--deep-brown);
    background: var(--cream);
    overflow-x: hidden;
    line-height: 1.6;
}

/* === Chamber System === */

.chamber {
    min-height: 100vh;
    scroll-snap-align: start;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.chamber-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding: 2rem;
    text-align: center;
}

.chamber-border {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--amber), transparent);
    animation: pulse-border 4s ease-in-out infinite;
}

@keyframes pulse-border {
    0%, 100% { opacity: 0.3; width: 40%; }
    50% { opacity: 1; width: 70%; }
}

/* === Chamber 1: Entrance Grotto === */

#chamber-entrance {
    background: var(--cream);
}

.title-display {
    font-family: 'Josefin Sans', sans-serif;
    font-weight: 300;
    font-size: clamp(2.5rem, 6vw, 5.5rem);
    letter-spacing: 0.06em;
    color: var(--deep-brown);
    margin-bottom: 1rem;
    opacity: 0;
    animation: fade-up 2s ease-out 0.5s forwards;
}

.title-dot {
    color: var(--terracotta);
}

.subtitle {
    font-family: 'Inter', sans-serif;
    font-weight: 400;
    font-size: clamp(0.9rem, 2vw, 1.15rem);
    color: var(--warm-brown);
    letter-spacing: 0.04em;
    opacity: 0;
    animation: fade-up 2s ease-out 1.2s forwards;
}

.scroll-cue {
    margin-top: 3rem;
    opacity: 0;
    animation: fade-up 2s ease-out 2s forwards;
}

.scroll-cue svg {
    animation: bob 3s ease-in-out infinite;
}

@keyframes bob {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
}

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

/* === Chamber 2: Observation Deck === */

#chamber-observation {
    background: var(--parchment);
}

.section-heading {
    font-family: 'Josefin Sans', sans-serif;
    font-weight: 600;
    font-size: clamp(1.8rem, 4vw, 3.5rem);
    letter-spacing: 0.06em;
    color: var(--deep-brown);
    margin-bottom: 1.5rem;
}

.section-text {
    font-family: 'Inter', sans-serif;
    font-size: clamp(0.95rem, 1.5vw, 1.1rem);
    color: var(--warm-brown);
    line-height: 1.8;
    max-width: 600px;
    margin: 0 auto 2rem;
}

.geometric-fish-display {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.geo-fish {
    width: 180px;
    height: auto;
    transition: transform 1.5s ease;
}

.fish-large {
    animation: swim-right 12s ease-in-out infinite;
}

.fish-small {
    animation: swim-right 15s ease-in-out infinite reverse;
    transform: scaleX(-1);
}

@keyframes swim-right {
    0%, 100% { transform: translateX(-20px) translateY(0); }
    25% { transform: translateX(20px) translateY(-8px); }
    50% { transform: translateX(30px) translateY(0); }
    75% { transform: translateX(10px) translateY(8px); }
}

/* === Chamber 3: Archive === */

#chamber-archive {
    background: var(--cream);
}

.specimen-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
    max-width: 800px;
}

.specimen-card {
    background: var(--parchment);
    border: 1px solid var(--sand);
    padding: 2rem 1.5rem;
    text-align: center;
    transition: transform 0.6s ease, box-shadow 0.6s ease;
}

.specimen-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(61, 43, 31, 0.1);
}

.specimen-icon {
    width: 80px;
    height: 80px;
    margin-bottom: 1rem;
}

.specimen-title {
    font-family: 'Josefin Sans', sans-serif;
    font-weight: 600;
    font-size: 1rem;
    letter-spacing: 0.04em;
    color: var(--deep-brown);
    margin-bottom: 0.75rem;
}

.specimen-desc {
    font-family: 'Space Mono', monospace;
    font-size: 0.85rem;
    color: var(--warm-brown);
    line-height: 1.6;
}

/* === Chamber 4: Laboratory === */

#chamber-laboratory {
    background: var(--deep-brown);
}

#chamber-laboratory .section-heading {
    color: var(--sand);
}

#chamber-laboratory .section-text {
    color: var(--sand);
    opacity: 0.8;
}

.reef-grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 4px;
    max-width: 500px;
    margin: 0 auto;
}

.reef-cell {
    aspect-ratio: 1;
    background: var(--warm-brown);
    transition: background-color 0.8s ease, transform 0.4s ease;
    position: relative;
}

.reef-cell:hover {
    transform: scale(1.1);
    z-index: 2;
}

.reef-cell.active-1 { background: var(--terracotta); }
.reef-cell.active-2 { background: var(--amber); }
.reef-cell.active-3 { background: var(--reef-green); }
.reef-cell.active-4 { background: var(--sand); }

/* === Chamber 5: Emergence === */

#chamber-emergence {
    background: linear-gradient(180deg, var(--deep-brown) 0%, var(--warm-brown) 40%, var(--sand) 100%);
}

.light-heading {
    color: var(--cream) !important;
}

.light-text {
    color: var(--sand) !important;
    opacity: 0.9;
}

.closing-sigil {
    margin: 2rem auto;
    animation: slow-spin 30s linear infinite;
}

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

.closing-text {
    font-family: 'Space Mono', monospace;
    font-weight: 300;
    font-size: 1rem;
    letter-spacing: 0.1em;
    color: var(--cream);
    opacity: 0.6;
}

/* === Fish Schools (floating background fish) === */

.fish-school {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
    z-index: 1;
}

.fish-school .bg-fish {
    position: absolute;
    opacity: 0.15;
    animation: drift linear infinite;
}

@keyframes drift {
    from { transform: translateX(-100px); }
    to { transform: translateX(calc(100vw + 100px)); }
}

/* === Reef Tessellation === */

.reef-tessellation {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    opacity: 0.06;
    background-image:
        linear-gradient(60deg, var(--terracotta) 25%, transparent 25%),
        linear-gradient(-60deg, var(--terracotta) 25%, transparent 25%),
        linear-gradient(60deg, transparent 75%, var(--terracotta) 75%),
        linear-gradient(-60deg, transparent 75%, var(--terracotta) 75%);
    background-size: 60px 104px;
    background-position: 0 0, 0 0, 30px 52px, 30px 52px;
}

/* === Scroll Reveal === */

.chamber-content {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 1s ease-out, transform 1s ease-out;
}

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

#chamber-entrance .chamber-content {
    opacity: 1;
    transform: none;
}

/* === Responsive === */

@media (max-width: 600px) {
    .geometric-fish-display {
        gap: 1.5rem;
    }
    .geo-fish {
        width: 130px;
    }
    .reef-grid {
        grid-template-columns: repeat(6, 1fr);
    }
    .specimen-grid {
        grid-template-columns: 1fr;
    }
}