:root {
    --abyss: #06101f;
    --deep-sea: #0b1a3d;
    --mid-ocean: #134e6f;
    --surface: #1e6f8e;
    --meridian-gold: #c4a35a;
    --starlight: #d8e2ef;
    --foam-white: #f0f4f8;
    --coral-blush: #b86e6e;
    --navy-text: #1e3a5f;
    --muted-teal: #5a9cb0;
}

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

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

body {
    font-family: "Nunito Sans", sans-serif;
    font-weight: 400;
    font-size: clamp(1rem, 1.8vw, 1.2rem);
    line-height: 1.75;
    color: var(--starlight);
    background: var(--deep-sea);
    overflow-x: hidden;
}

/* ===== MERIDIAN SPINE ===== */
#meridian-spine {
    position: fixed;
    top: 0;
    left: 50%;
    width: 2px;
    height: 100vh;
    z-index: 100;
    pointer-events: none;
    transform: translateX(-50%);
}

#meridian-line {
    position: absolute;
    top: 0;
    left: 0;
    width: 2px;
    height: 100%;
}

#meridian-path {
    stroke-dasharray: 4000;
    stroke-dashoffset: 4000;
    animation: drawSpine 2s ease-out forwards;
}

@keyframes drawSpine {
    to { stroke-dashoffset: 0; }
}

.meridian-nav {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    gap: 24px;
    pointer-events: all;
}

.meridian-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--meridian-gold);
    border: none;
    cursor: pointer;
    opacity: 0.4;
    transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.meridian-dot:hover,
.meridian-dot.active {
    opacity: 1;
    transform: translateY(-4px) scale(1.4);
    box-shadow: 0 6px 16px rgba(196, 163, 90, 0.4);
}

/* ===== GRID OVERLAY ===== */
#grid-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    background-image:
        repeating-linear-gradient(0deg, rgba(196, 163, 90, 0.03) 0px, rgba(196, 163, 90, 0.03) 1px, transparent 1px, transparent 48px),
        repeating-linear-gradient(90deg, rgba(196, 163, 90, 0.03) 0px, rgba(196, 163, 90, 0.03) 1px, transparent 1px, transparent 48px);
}

/* ===== SCENES ===== */
.scene {
    min-height: 100vh;
    height: 100vh;
    width: 100%;
    scroll-snap-align: start;
    position: relative;
    overflow: hidden;
}

.scene-content {
    width: 100%;
    height: 100%;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

/* ===== SCENE 1: HERO ===== */
.scene-1 {
    background: linear-gradient(180deg, var(--deep-sea) 0%, var(--mid-ocean) 45%, var(--meridian-gold) 50%, var(--mid-ocean) 55%, var(--deep-sea) 100%);
}

.hero-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    position: relative;
    z-index: 10;
}

.title-left {
    font-family: "Jost", sans-serif;
    font-weight: 600;
    font-size: clamp(2.4rem, 5.5vw, 5rem);
    letter-spacing: -0.02em;
    color: var(--meridian-gold);
    text-align: right;
    padding-right: 4px;
}

.title-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--meridian-gold);
    display: inline-block;
    flex-shrink: 0;
    box-shadow: 0 0 20px rgba(196, 163, 90, 0.5);
}

.title-right {
    font-family: "Jost", sans-serif;
    font-weight: 600;
    font-size: clamp(2.4rem, 5.5vw, 5rem);
    letter-spacing: -0.02em;
    color: var(--meridian-gold);
    text-align: left;
    padding-left: 4px;
}

.hero-horizon {
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent 0%, var(--meridian-gold) 20%, var(--meridian-gold) 80%, transparent 100%);
    position: absolute;
    top: 50%;
    opacity: 0.4;
}

.hero-subtitle {
    font-family: "Nunito Sans", sans-serif;
    font-weight: 400;
    font-size: clamp(1rem, 1.8vw, 1.2rem);
    color: var(--starlight);
    margin-top: 24px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 600ms cubic-bezier(0.25, 0.46, 0.45, 0.94) 1.5s forwards;
    position: relative;
    z-index: 10;
}

@keyframes fadeUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== COMPASS ROSES (mini) ===== */
.compass-rose-mini {
    position: absolute;
    opacity: 0.3;
    transition: transform 10s linear;
}

.scene1-compass {
    bottom: 15%;
    right: 12%;
}

.scene2-compass {
    top: 8%;
    left: 10%;
}

.scene3-compass {
    bottom: 10%;
    right: 8%;
}

.scene4-compass {
    top: 12%;
    left: 15%;
}

/* ===== SCENE 2: INSTRUMENTS ===== */
.scene-2 {
    background: linear-gradient(180deg, var(--deep-sea) 0%, var(--mid-ocean) 50%, var(--deep-sea) 100%);
}

.instruments-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto auto;
    gap: 0;
    padding: 5vh 5vw;
    align-items: center;
    height: 100%;
}

.instrument {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
    cursor: default;
}

.instrument:hover {
    transform: translateY(-8px) scale(1.03);
    filter: drop-shadow(0 12px 32px rgba(6, 16, 31, 0.5));
}

.instrument-right {
    grid-column: 2;
    justify-self: start;
    padding-left: 40px;
}

.instrument-left {
    grid-column: 1;
    justify-self: end;
    padding-right: 40px;
}

.instrument-text {
    max-width: 360px;
}

.text-left {
    grid-column: 1;
    justify-self: end;
    text-align: right;
    padding-right: 40px;
}

.text-right {
    grid-column: 2;
    justify-self: start;
    text-align: left;
    padding-left: 40px;
}

.instrument-label {
    font-family: "Cutive Mono", monospace;
    font-size: 0.8rem;
    letter-spacing: 0.08em;
    color: var(--muted-teal);
    text-transform: uppercase;
}

.body-text {
    font-family: "Nunito Sans", sans-serif;
    font-weight: 400;
    font-size: clamp(0.9rem, 1.4vw, 1.1rem);
    line-height: 1.75;
    color: var(--starlight);
}

.coord-label {
    font-family: "Cutive Mono", monospace;
    font-size: 0.8rem;
    letter-spacing: 0.08em;
    color: var(--muted-teal);
    display: inline-block;
    margin-top: 8px;
}

.isometric-icon {
    transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.astrolabe-rete {
    transition: transform 0.6s ease-out;
    transform-origin: 100px 100px;
}

.astrolabe:hover .astrolabe-rete {
    transform: rotate(15deg);
}

/* ===== SCENE 3: TIMEZONE GALLERY ===== */
.scene-3 {
    background: linear-gradient(180deg, var(--deep-sea) 0%, var(--surface) 50%, var(--deep-sea) 100%);
}

.timezone-gallery {
    justify-content: flex-start;
    padding-top: 8vh;
}

.scene-title {
    font-family: "Jost", sans-serif;
    font-weight: 600;
    font-size: clamp(1.8rem, 4vw, 3rem);
    letter-spacing: -0.02em;
    color: var(--meridian-gold);
    margin-bottom: 4vh;
    text-align: center;
}

.timezone-columns {
    display: flex;
    justify-content: center;
    align-items: flex-end;
    height: 65vh;
    width: 90%;
    gap: 4px;
}

.tz-column {
    width: var(--tz-width, 8%);
    height: 85%;
    background: var(--tz-shade, var(--mid-ocean));
    transform: rotate(var(--tz-lean, 0deg));
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    padding: 16px 4px;
    position: relative;
    transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
    border: 1px solid rgba(196, 163, 90, 0.08);
}

.tz-column:hover {
    transform: rotate(var(--tz-lean, 0deg)) translateY(-8px) scale(1.03);
    box-shadow: 0 12px 32px rgba(6, 16, 31, 0.5);
    border-color: rgba(196, 163, 90, 0.2);
}

.tz-meridian {
    border-color: rgba(196, 163, 90, 0.3);
    box-shadow: 0 0 24px rgba(196, 163, 90, 0.1);
}

.tz-compass-top {
    display: flex;
    justify-content: center;
}

.tz-label {
    font-family: "Cutive Mono", monospace;
    font-size: 0.7rem;
    letter-spacing: 0.08em;
    color: var(--muted-teal);
    writing-mode: vertical-lr;
    text-orientation: mixed;
}

.tz-label-prime {
    color: var(--meridian-gold);
    font-weight: bold;
}

/* ===== SCENE 4: OCEAN FLOOR ===== */
.scene-4 {
    background: var(--abyss);
}

.ocean-floor {
    justify-content: flex-end;
    padding-bottom: 10vh;
}

.particle-stream {
    position: absolute;
    left: 50%;
    bottom: 0;
    width: 40px;
    height: 100%;
    transform: translateX(-50%);
    pointer-events: none;
}

.particle {
    position: absolute;
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: var(--meridian-gold);
    opacity: 0.6;
    animation: floatUp var(--duration, 6s) var(--delay, 0s) infinite;
}

@keyframes floatUp {
    0% {
        bottom: 0;
        opacity: 0;
        transform: translateX(var(--drift, 0px));
    }
    10% {
        opacity: 0.7;
    }
    90% {
        opacity: 0.4;
    }
    100% {
        bottom: 100%;
        opacity: 0;
        transform: translateX(calc(var(--drift, 0px) * -1));
    }
}

.seabed-instrument {
    position: absolute;
    transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
    cursor: default;
}

.seabed-instrument:hover {
    transform: translateY(-8px) scale(1.03);
    filter: drop-shadow(0 12px 32px rgba(6, 16, 31, 0.5));
}

.seabed-spyglass {
    bottom: 30%;
    left: 15%;
    transform: rotate(-15deg);
}

.seabed-spyglass:hover {
    transform: rotate(-15deg) translateY(-8px) scale(1.03);
}

.seabed-compass-rose {
    bottom: 20%;
    right: 20%;
}

.seabed-sextant-small {
    bottom: 40%;
    right: 35%;
}

.impossible-coord {
    position: absolute;
    bottom: 55%;
    left: 25%;
    cursor: help;
    position: relative;
}

.impossible-coord:hover .impossible {
    animation: shake 0.3s ease-in-out;
    color: var(--coral-blush);
}

.impossible-coord:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    top: -30px;
    left: 50%;
    transform: translateX(-50%);
    font-family: "Cutive Mono", monospace;
    font-size: 0.75rem;
    color: var(--coral-blush);
    white-space: nowrap;
    opacity: 1;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-2px); }
    75% { transform: translateX(2px); }
}

.impossible {
    font-family: "Cutive Mono", monospace;
    font-size: 0.8rem;
    letter-spacing: 0.08em;
    color: var(--muted-teal);
    transition: color 0.3s;
}

.floor-text {
    font-family: "Nunito Sans", sans-serif;
    font-weight: 400;
    font-size: clamp(1rem, 1.8vw, 1.2rem);
    line-height: 1.75;
    color: var(--starlight);
    max-width: 500px;
    text-align: center;
    opacity: 0.7;
    margin-top: 40px;
    position: relative;
    z-index: 5;
}

/* ===== FADE-IN ANIMATIONS ===== */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 600ms cubic-bezier(0.25, 0.46, 0.45, 0.94), transform 600ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== DEGREE TICK MARKS ===== */
#meridian-spine::before {
    content: "";
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 100%;
    background-image: repeating-linear-gradient(
        180deg,
        transparent 0px,
        transparent 44px,
        rgba(196, 163, 90, 0.2) 44px,
        rgba(196, 163, 90, 0.2) 48px
    );
    pointer-events: none;
}

/* ===== HOVER-LIFT for icons ===== */
.isometric-icon:hover {
    transform: translateY(-4px);
    filter: drop-shadow(0 8px 20px rgba(6, 16, 31, 0.4));
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .instruments-layout {
        grid-template-columns: 1fr;
        padding: 3vh 5vw;
        gap: 20px;
    }

    .instrument-right,
    .instrument-left {
        grid-column: 1;
        justify-self: center;
        padding: 0;
    }

    .text-left,
    .text-right {
        grid-column: 1;
        justify-self: center;
        text-align: center;
        padding: 0 20px;
    }

    .timezone-columns {
        width: 95%;
    }

    .tz-column {
        min-width: 24px;
    }

    .hero-title {
        flex-direction: row;
    }

    .seabed-spyglass {
        left: 5%;
    }

    .seabed-compass-rose {
        right: 5%;
    }
}

/* ===== PRINT ===== */
@media print {
    .scene { height: auto; min-height: 0; page-break-after: always; }
    #meridian-spine, #grid-overlay, .particle-stream, .compass-rose-mini { display: none; }
    .meridian-gold, .title-left, .title-right, .scene-title { color: #000 !important; }
    body { color: #000; background: #fff; }
}