/* ============================================
   xanadu.science - Holographic Data Cathedral
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    --bg-primary: #070B1A;
    --bg-secondary: #111730;
    --fg-primary: #E8ECF5;
    --fg-secondary: #8B92A8;
    --accent-teal: #3CFFD0;
    --accent-violet: #9B6CFF;
    --accent-gold: #FFD166;
    --accent-rose: #FF6B8A;

    --font-display: 'Space Grotesk', system-ui, -apple-system, sans-serif;
    --font-body: 'Instrument Serif', Georgia, serif;
    --font-mono: 'Azeret Mono', ui-monospace, 'Cascadia Code', monospace;

    --scroll-progress: 0;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    background: var(--bg-primary);
}

body {
    font-family: var(--font-body);
    color: var(--fg-primary);
    background: var(--bg-primary);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --- Scroll Container --- */
.scroll-container {
    width: 100%;
    height: 100vh;
    overflow-y: auto;
    scroll-snap-type: y mandatory;
    scroll-behavior: smooth;
}

/* --- Zones (shared) --- */
.zone {
    position: relative;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    scroll-snap-align: start;
}

.zone-0 { height: 100vh; }
.zone-1 { height: 120vh; }
.zone-2 { height: 140vh; }
.zone-3 { height: 100vh; }
.zone-4 { height: 80vh; }

/* --- Concentric Ring Grid (persistent background) --- */
.ring-grid {
    position: fixed;
    top: 50%;
    left: 50%;
    width: 200vmax;
    height: 200vmax;
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: 0;
    animation: ringRotate 360s linear infinite;
}

.ring-grid-group {
    transform-origin: 500px 500px;
}

.grid-ring {
    fill: none;
    stroke: var(--fg-secondary);
    stroke-width: 0.3;
    opacity: 0.04;
}

.grid-ring--major {
    opacity: 0.08;
    stroke-dasharray: 4 12;
}

@keyframes ringRotate {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* --- Floating Spectral Particles --- */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    overflow: hidden;
}

.particle {
    position: absolute;
    border-radius: 50%;
    mix-blend-mode: screen;
    opacity: 0.6;
}

.particle--teal { background: var(--accent-teal); }
.particle--violet { background: var(--accent-violet); }
.particle--gold { background: var(--accent-gold); }

@keyframes particleDriftA {
    0%   { transform: translate(0, 0); }
    25%  { transform: translate(80px, -120px); }
    50%  { transform: translate(-40px, -60px); }
    75%  { transform: translate(60px, 80px); }
    100% { transform: translate(0, 0); }
}

@keyframes particleDriftB {
    0%   { transform: translate(0, 0); }
    25%  { transform: translate(-100px, 60px); }
    50%  { transform: translate(50px, 100px); }
    75%  { transform: translate(-70px, -40px); }
    100% { transform: translate(0, 0); }
}

@keyframes particleDriftC {
    0%   { transform: translate(0, 0); }
    25%  { transform: translate(60px, 90px); }
    50%  { transform: translate(-80px, -30px); }
    75%  { transform: translate(30px, -70px); }
    100% { transform: translate(0, 0); }
}

/* ==============================
   ZONE 0 - Nucleus
   ============================== */

.zone-0 {
    background: var(--bg-primary);
    z-index: 2;
}

/* Prismatic dispersion rays */
.dispersion-rays {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 200vmax;
    height: 200vmax;
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: 1;
}

.dispersion-ray {
    fill: none;
    stroke-width: 0.8;
    mix-blend-mode: screen;
    opacity: 0;
    stroke-dasharray: 300;
    stroke-dashoffset: 300;
    transition: opacity 0.6s ease;
}

.dispersion-ray.active {
    opacity: 1;
    animation: rayPulse 4s ease-in-out infinite;
}

@keyframes rayPulse {
    0%   { stroke-dashoffset: 300; opacity: 0.3; }
    50%  { stroke-dashoffset: 0; opacity: 0.7; }
    100% { stroke-dashoffset: -300; opacity: 0.3; }
}

/* Nucleus title */
.nucleus {
    position: relative;
    z-index: 5;
    text-align: center;
}

.nucleus-title {
    position: relative;
    font-family: var(--font-display);
    font-size: clamp(3rem, 9vw, 8rem);
    font-weight: 700;
    letter-spacing: 0.12em;
    line-height: 1.1;
    cursor: default;
}

/* Chromatic aberration layers */
.chromatic-layer {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    text-align: center;
    transition: transform 0.4s ease;
}

.chromatic-main {
    position: relative;
    color: var(--fg-primary);
}

.chromatic-teal {
    color: var(--accent-teal);
    opacity: 0.3;
    transform: translate(-2px, 0);
}

.chromatic-violet {
    color: var(--accent-violet);
    opacity: 0.3;
    transform: translate(0, 2px);
}

.chromatic-gold {
    color: var(--accent-gold);
    opacity: 0.3;
    transform: translate(2px, -1px);
}

.nucleus-title:hover .chromatic-teal {
    transform: translate(-3px, 0);
}

.nucleus-title:hover .chromatic-violet {
    transform: translate(0, 3px);
}

.nucleus-title:hover .chromatic-gold {
    transform: translate(3px, -2px);
}

.nucleus-subtitle {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent-teal);
    margin-top: 1.5rem;
    opacity: 0.7;
}

/* ==============================
   ZONE 1 - First Orbital
   ============================== */

.zone-1 {
    background: transparent;
    z-index: 3;
}

/* SVG node link paths */
.zone-1-links {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 200vmin;
    height: 200vmin;
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: 1;
}

.node-path {
    fill: none;
    stroke: var(--accent-teal);
    stroke-width: 1;
    opacity: 0.4;
    stroke-dasharray: 400;
    stroke-dashoffset: 400;
    transition: opacity 0.4s ease, stroke-width 0.3s ease, filter 0.3s ease;
}

.node-path.drawn {
    animation: pathDraw 1.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

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

/* Orbital cards */
.orbital-card {
    position: absolute;
    width: clamp(220px, 28vmin, 320px);
    padding: 2rem 1.5rem;
    background: rgba(17, 23, 48, 0.6);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(155, 108, 255, 0.2);
    border-radius: 12px;
    z-index: 5;
    opacity: 0;
    transform: scale(0.85);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.8s cubic-bezier(0.16, 1, 0.3, 1),
                border-color 0.4s ease,
                box-shadow 0.4s ease;
}

.orbital-card.visible {
    opacity: 1;
    transform: scale(1);
}

.orbital-card:hover {
    transform: scale(1.03);
    border-color: rgba(155, 108, 255, 0.6);
    box-shadow: 0 0 30px rgba(155, 108, 255, 0.15);
}

/* Card positions - radial at 35vmin from center */
.card-north {
    top: calc(50% - 35vmin - 60px);
    left: 50%;
    transform-origin: center bottom;
    translate: -50% 0;
}
.card-north.visible { translate: -50% 0; }

.card-east {
    top: 50%;
    left: calc(50% + 35vmin - 60px);
    transform-origin: left center;
    translate: 0 -50%;
}
.card-east.visible { translate: 0 -50%; }

.card-south {
    top: calc(50% + 35vmin - 60px);
    left: 50%;
    transform-origin: center top;
    translate: -50% 0;
}
.card-south.visible { translate: -50% 0; }

.card-west {
    top: 50%;
    left: calc(50% - 35vmin - 160px);
    transform-origin: right center;
    translate: 0 -50%;
}
.card-west.visible { translate: 0 -50%; }

.card-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent-teal);
    display: block;
    margin-bottom: 0.75rem;
}

.card-title {
    font-family: var(--font-display);
    font-size: clamp(1.2rem, 2.5vw, 1.6rem);
    font-weight: 700;
    color: var(--fg-primary);
    letter-spacing: 0.04em;
    margin-bottom: 0.75rem;
}

.card-text {
    font-family: var(--font-body);
    font-size: clamp(0.9rem, 1.4vw, 1.05rem);
    font-weight: 400;
    line-height: 1.72;
    letter-spacing: 0.01em;
    color: var(--fg-secondary);
}

/* ==============================
   ZONE 2 - Second Orbital
   ============================== */

.zone-2 {
    background: transparent;
    z-index: 4;
}

.orbital-node {
    position: absolute;
    width: clamp(200px, 26vmin, 300px);
    z-index: 5;
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.orbital-node.visible {
    opacity: 1;
    transform: scale(1);
}

.node-text {
    font-family: var(--font-body);
    font-size: clamp(0.9rem, 1.4vw, 1.1rem);
    font-weight: 400;
    line-height: 1.72;
    letter-spacing: 0.01em;
    color: var(--fg-primary);
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent-violet);
    opacity: 0.85;
}

/* Position nodes at 45-degree intervals around center at ~38vmin radius */
.node-0 { top: calc(50% - 40vmin); left: 50%; translate: -50% 0; }
.node-1 { top: calc(50% - 28vmin); left: calc(50% + 28vmin); translate: -50% 0; }
.node-2 { top: 50%; left: calc(50% + 40vmin); translate: -50% -50%; }
.node-3 { top: calc(50% + 28vmin); left: calc(50% + 28vmin); translate: -50% 0; }
.node-4 { top: calc(50% + 40vmin); left: 50%; translate: -50% 0; }
.node-5 { top: calc(50% + 28vmin); left: calc(50% - 28vmin); translate: -50% 0; }
.node-6 { top: 50%; left: calc(50% - 40vmin); translate: -50% -50%; }
.node-7 { top: calc(50% - 28vmin); left: calc(50% - 28vmin); translate: -50% 0; }

/* ==============================
   ZONE 3 - Spectral Analysis Strip
   ============================== */

.zone-3 {
    background: var(--bg-secondary);
    z-index: 5;
    flex-direction: column;
}

.spectral-strip {
    position: relative;
    width: 100%;
    min-height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.spectral-gradient {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        var(--accent-teal) 0%,
        var(--accent-violet) 25%,
        var(--accent-gold) 50%,
        var(--accent-rose) 75%,
        var(--accent-teal) 100%
    );
    opacity: 0.06;
    z-index: 0;
    animation: spectralShift 20s linear infinite;
    background-size: 200% 100%;
}

@keyframes spectralShift {
    0%   { background-position: 0% 50%; }
    100% { background-position: 200% 50%; }
}

.spectral-content {
    position: relative;
    z-index: 2;
    max-width: 720px;
    padding: 4rem 2rem;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 1s cubic-bezier(0.16, 1, 0.3, 1),
                transform 1s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.spectral-text {
    font-family: var(--font-body);
    font-size: clamp(1rem, 1.6vw, 1.25rem);
    font-weight: 400;
    line-height: 1.72;
    letter-spacing: 0.01em;
    color: var(--fg-primary);
    text-align: left;
}

/* Spectral gradient border top and bottom */
.spectral-strip::before,
.spectral-strip::after {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(
        90deg,
        var(--accent-teal),
        var(--accent-violet),
        var(--accent-gold),
        var(--accent-rose),
        var(--accent-teal)
    );
    background-size: 200% 100%;
    animation: spectralShift 12s linear infinite;
    z-index: 3;
}

.spectral-strip::before { top: 0; }
.spectral-strip::after { bottom: 0; }

/* ==============================
   ZONE 4 - Outer Shell / Closing
   ============================== */

.zone-4 {
    background: var(--bg-primary);
    z-index: 6;
}

.rays-closing {
    opacity: 0.5;
}

.closing-nucleus {
    position: relative;
    z-index: 5;
    text-align: center;
}

.closing-title {
    position: relative;
    font-family: var(--font-display);
    font-size: clamp(2rem, 6vw, 5rem);
    font-weight: 700;
    letter-spacing: 0.12em;
    line-height: 1.1;
    opacity: 0.6;
    animation: closingRotate 120s linear infinite;
}

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

.closing-line {
    font-family: var(--font-body);
    font-size: clamp(1rem, 1.6vw, 1.25rem);
    font-weight: 400;
    line-height: 1.72;
    color: var(--accent-rose);
    margin-top: 2rem;
    letter-spacing: 0.02em;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 1s ease 0.3s, transform 1s ease 0.3s;
}

.closing-line.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ==============================
   Zone Indicator (floating nav)
   ============================== */

.zone-indicator {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 100;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.zone-indicator-svg {
    width: 40px;
    height: 40px;
}

.indicator-ring {
    fill: none;
    stroke: var(--fg-secondary);
    stroke-width: 1;
    opacity: 0.3;
    transition: opacity 0.4s ease, stroke 0.4s ease, fill 0.4s ease;
}

.indicator-ring.visited {
    stroke: var(--accent-teal);
    opacity: 0.8;
}

.indicator-ring.current {
    stroke: var(--accent-teal);
    fill: rgba(60, 255, 208, 0.15);
    opacity: 1;
    animation: indicatorPulse 0.5s ease-in-out infinite alternate;
}

@keyframes indicatorPulse {
    from { opacity: 0.7; }
    to { opacity: 1; }
}

.zone-counter {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent-teal);
}

/* ==============================
   3D Tilt on cards
   ============================== */

.orbital-card.tilting {
    transition: border-color 0.4s ease, box-shadow 0.4s ease;
}

/* ==============================
   Zone transitions: blur-focus
   ============================== */

.zone {
    transition: filter 0.6s ease;
}

.zone.blurred {
    filter: blur(2px);
}

.zone.focused {
    filter: blur(0);
}

/* ==============================
   Reduced motion
   ============================== */

@media (prefers-reduced-motion: reduce) {
    .ring-grid {
        animation: none;
    }
    .particle {
        animation: none !important;
    }
    .dispersion-ray {
        animation: none;
        stroke-dashoffset: 0;
    }
    .dispersion-ray.active {
        animation: none;
        stroke-dashoffset: 0;
    }
    .spectral-gradient {
        animation: none;
    }
    .spectral-strip::before,
    .spectral-strip::after {
        animation: none;
    }
    .closing-title {
        animation: none;
    }
    .indicator-ring.current {
        animation: none;
        opacity: 1;
    }
    .chromatic-teal,
    .chromatic-violet,
    .chromatic-gold {
        transform: none;
    }
    .nucleus-title:hover .chromatic-teal,
    .nucleus-title:hover .chromatic-violet,
    .nucleus-title:hover .chromatic-gold {
        transform: none;
    }
    .node-path.drawn {
        animation: none;
        stroke-dashoffset: 0;
    }
}

/* ==============================
   Responsive adjustments
   ============================== */

@media (max-width: 768px) {
    .orbital-card {
        width: clamp(180px, 60vw, 260px);
        padding: 1.5rem 1rem;
    }

    .card-north {
        top: calc(50% - 32vmin);
    }
    .card-east {
        left: calc(50% + 20vmin);
    }
    .card-south {
        top: calc(50% + 32vmin);
    }
    .card-west {
        left: calc(50% - 20vmin - 130px);
    }

    .orbital-node {
        width: clamp(160px, 50vw, 240px);
    }

    .node-0 { top: calc(50% - 36vmin); }
    .node-1 { top: calc(50% - 24vmin); left: calc(50% + 22vmin); }
    .node-2 { left: calc(50% + 36vmin); }
    .node-3 { top: calc(50% + 24vmin); left: calc(50% + 22vmin); }
    .node-4 { top: calc(50% + 36vmin); }
    .node-5 { top: calc(50% + 24vmin); left: calc(50% - 22vmin); }
    .node-6 { left: calc(50% - 36vmin); }
    .node-7 { top: calc(50% - 24vmin); left: calc(50% - 22vmin); }

    .spectral-content {
        padding: 3rem 1.5rem;
    }

    .zone-indicator {
        bottom: 1rem;
        right: 1rem;
    }
}

@media (max-width: 480px) {
    .zone-1 {
        height: 200vh;
    }

    .orbital-card {
        position: relative;
        top: auto;
        left: auto;
        translate: none;
        width: 85vw;
        margin: 1rem auto;
    }

    .card-north,
    .card-east,
    .card-south,
    .card-west {
        top: auto;
        left: auto;
        translate: none;
    }

    .card-north.visible,
    .card-east.visible,
    .card-south.visible,
    .card-west.visible {
        translate: none;
    }

    .zone-1 {
        flex-direction: column;
        gap: 1.5rem;
        padding: 4rem 0;
    }

    .zone-1-links {
        display: none;
    }

    .zone-2 {
        flex-direction: column;
        gap: 2rem;
        padding: 4rem 0;
        height: auto;
        min-height: 140vh;
    }

    .orbital-node {
        position: relative;
        top: auto;
        left: auto;
        translate: none;
        width: 85vw;
        margin: 0 auto;
    }

    .node-0, .node-1, .node-2, .node-3,
    .node-4, .node-5, .node-6, .node-7 {
        top: auto;
        left: auto;
        translate: none;
    }
}