/* ============================================================
   tsundere.science — Memphis-Glitch Minimal
   Design: Ma (間) negative space + dark neon spectral palette
   ============================================================ */

/* ── Custom Properties ── */
:root {
    /* Palette */
    --void:        #090909;
    --deep-space:  #0a0a12;
    --star-white:  #C8CCDB;
    --slate:       #888EA4;
    --magenta:     #FF2D9B;
    --chartreuse:  #E8FF00;
    --cyan:        #00FFEA;
    --violet:      #9B00FF;

    /* Typography */
    --font-display: 'Space Grotesk', sans-serif;
    --font-mono:    'DM Mono', monospace;

    /* Easing */
    --spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --ease-out: cubic-bezier(0.22, 1, 0.36, 1);

    /* Section heights */
    --section-h: 100vh;
}

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

html {
    background-color: var(--void);
    color-scheme: dark;
    scroll-behavior: auto;
}

body {
    background: radial-gradient(ellipse at 30% 40%, var(--deep-space) 0%, var(--void) 70%);
    color: var(--star-white);
    font-family: var(--font-mono);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* ── Star Field (fixed, z-index 0) ── */
#star-field {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    will-change: transform;
}

#stars-svg {
    width: 100%;
    height: 100%;
}

.star-label {
    font-family: var(--font-mono);
    font-size: 9px;
    fill: var(--magenta);
    opacity: 0.75;
    letter-spacing: 0.02em;
}

/* ── Scroll Main Layer (z-index 10+) ── */
#scroll-main {
    position: relative;
    z-index: 10;
}

/* ── Void Section Base ── */
.void-section {
    position: relative;
    min-height: 100vh;
    width: 100%;
}

/* ── Section 1: Opening Void ── */
#opening-void {
    min-height: 100vh;
}

/* Memphis diagonal bar — top-right, acid chartreuse */
.memphis-bar {
    position: absolute;
    width: 280px;
    height: 6px;
    pointer-events: none;
    z-index: 5;
}

.memphis-bar--chartreuse {
    background-color: var(--chartreuse);
    opacity: 0.85;
}

.memphis-bar--topleft {
    top: 18vh;
    right: 6vw;
    transform: rotate(-34deg);
    transform-origin: right center;
}

.memphis-bar--bottomleft {
    bottom: 18vh;
    left: 6vw;
    transform: rotate(-28deg);
    transform-origin: left center;
}

/* Monogram */
.monogram {
    position: absolute;
    top: 5vh;
    left: 5vw;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 11px;
    color: #444;
    letter-spacing: -0.01em;
    z-index: 20;
    line-height: 1;
    user-select: none;
}

.monogram--small {
    font-size: 11px;
    font-family: var(--font-mono);
    font-weight: 400;
    color: var(--slate);
    letter-spacing: 0.05em;
    top: auto;
    left: auto;
    right: 12vw;
    bottom: 22vh;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.monogram-coords {
    font-family: var(--font-mono);
    font-size: 9px;
    color: var(--slate);
    letter-spacing: 0.04em;
    opacity: 0.7;
    display: block;
    margin-top: 4px;
}

/* ── Section 2: First Emergence ── */
#first-emergence {
    min-height: 120vh;
}

.emergence-anchor {
    position: absolute;
    bottom: 28vh;
    left: 7vw;
    z-index: 15;
}

.headline-primary {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(64px, 8vw, 96px);
    color: var(--magenta);
    letter-spacing: -0.03em;
    line-height: 1;
    position: relative;
    display: inline-block;
}

.designation-label {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--slate);
    letter-spacing: 0.06em;
    margin-top: 12px;
    text-transform: lowercase;
}

/* ── Section 3: Constellation Node ── */
#constellation-node {
    min-height: 160vh;
    display: flex;
    align-items: center;
}

.emission-spectrum {
    position: relative;
    width: 100%;
    height: 20vh;
    margin: 0;
    overflow: hidden;
}

.spectrum-line {
    position: absolute;
    top: 0;
    width: 2px;
    height: 100%;
    opacity: 0.85;
    box-shadow: 0 0 8px currentColor;
}

/* ── Section 4: Memphis Interrupt ── */
#memphis-interrupt {
    min-height: 120vh;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    overflow: hidden;
}

.zigzag-band {
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    transform: translateY(-50%);
    z-index: 5;
    pointer-events: none;
}

.memphis-circle {
    position: absolute;
    right: -40px;
    top: 50%;
    transform: translateY(-30%);
    width: 80px;
    height: 80px;
    border: 3px solid var(--magenta);
    border-radius: 50%;
    background: transparent;
    z-index: 6;
    pointer-events: none;
}

/* Glitch RGB split word */
.glitch-rgb-target {
    position: absolute;
    left: 8vw;
    top: 38%;
    pointer-events: none;
    z-index: 15;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(40px, 5vw, 72px);
    letter-spacing: -0.03em;
    line-height: 1;
}

.glitch-rgb-layer {
    position: absolute;
    top: 0;
    left: 0;
    display: block;
    white-space: nowrap;
}

.glitch-rgb-r {
    color: var(--magenta);
    opacity: 0;
}
.glitch-rgb-g {
    color: var(--cyan);
    opacity: 0;
}
.glitch-rgb-b {
    color: var(--chartreuse);
    opacity: 0;
}

/* Active glitch state — triggered by JS class addition */
.glitch-rgb-target.glitch-active .glitch-rgb-r {
    animation: glitch-chan-r 0.25s var(--ease-out) forwards;
}
.glitch-rgb-target.glitch-active .glitch-rgb-g {
    animation: glitch-chan-g 0.25s var(--ease-out) forwards 0.04s;
}
.glitch-rgb-target.glitch-active .glitch-rgb-b {
    animation: glitch-chan-b 0.25s var(--ease-out) forwards 0.08s;
}

@keyframes glitch-chan-r {
    0%   { opacity: 0; transform: translateX(0); }
    20%  { opacity: 0.9; transform: translateX(-5px); }
    60%  { opacity: 0.7; transform: translateX(3px); }
    80%  { opacity: 0.5; transform: translateX(-2px); }
    100% { opacity: 0; transform: translateX(0); }
}

@keyframes glitch-chan-g {
    0%   { opacity: 0; transform: translateX(0); }
    20%  { opacity: 0.8; transform: translateX(4px); }
    60%  { opacity: 0.6; transform: translateX(-2px); }
    80%  { opacity: 0.4; transform: translateX(1px); }
    100% { opacity: 0; transform: translateX(0); }
}

@keyframes glitch-chan-b {
    0%   { opacity: 0; transform: translateX(0); }
    20%  { opacity: 0.85; transform: translateX(2px); }
    60%  { opacity: 0.65; transform: translateX(-3px); }
    80%  { opacity: 0.45; transform: translateX(2px); }
    100% { opacity: 0; transform: translateX(0); }
}

/* Primary glitch-tear keyframe — used on headline */
@keyframes glitch-tear {
    0%   { clip-path: inset(0 0 98% 0); opacity: 0; transform: translateX(0); }
    20%  { clip-path: inset(30% 0 50% 0); opacity: 1; transform: translateX(3px); }
    40%  { clip-path: inset(60% 0 20% 0); opacity: 1; transform: translateX(-3px); }
    70%  { clip-path: inset(80% 0 5% 0); opacity: 0.6; transform: translateX(2px); }
    100% { clip-path: inset(0 0 100% 0); opacity: 0; transform: translateX(0); }
}

/* Glitch overlay pseudo-elements on headline */
.headline-primary::before,
.headline-primary::after {
    content: attr(data-text);
    position: absolute;
    inset: 0;
    color: var(--cyan);
    pointer-events: none;
    opacity: 0;
}

.headline-primary.glitch-fired::before {
    color: var(--magenta);
    animation: glitch-tear 0.35s var(--ease-out) forwards;
}
.headline-primary.glitch-fired::after {
    color: var(--cyan);
    animation: glitch-tear 0.35s var(--ease-out) forwards 0.06s;
}

/* Chromatic aberration text-shadow — applied once per scroll session */
.chromatic-aberration {
    text-shadow: 2px 0 #FF2D9B, -2px 0 #00FFEA;
}

/* Glitch torn-region: stacked rect layers — magenta, cyan, near-white (#E8E8F8) */
.glitch-torn-region {
    position: absolute;
    pointer-events: none;
    z-index: 12;
    width: 200px;
    height: 18px;
    overflow: hidden;
    opacity: 0;
}

.glitch-torn-region svg rect {
    /* channel layers defined inline */
}

.glitch-torn-region.glitch-torn-active {
    animation: torn-blink 0.3s var(--ease-out) forwards;
}

@keyframes torn-blink {
    0%   { opacity: 0; }
    20%  { opacity: 1; }
    80%  { opacity: 0.7; }
    100% { opacity: 0; }
}

/* ── Section 5: Text Constellation ── */
#text-constellation {
    min-height: 150vh;
    position: relative;
}

.prose-node {
    position: absolute;
    max-width: 52ch;
    z-index: 15;
}

.prose-node p {
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.8;
    color: var(--star-white);
    letter-spacing: 0.01em;
    opacity: 0;
    transform: translateY(-12px);
    transition: opacity 0.7s var(--spring), transform 0.7s var(--spring);
}

.prose-node.visible p {
    opacity: 1;
    transform: translateY(0);
}

.prose-node--upperleft {
    top: 14vh;
    left: 6vw;
}

.prose-node--centerright {
    top: 48vh;
    right: 8vw;
    text-align: right;
}

.prose-node--lowerleft {
    bottom: 20vh;
    left: 18vw;
}

/* Diagonal rule line */
.diagonal-rule {
    position: absolute;
    top: 50%;
    left: 20%;
    width: 45%;
    height: 1px;
    background-color: var(--magenta);
    opacity: 0.4;
    transform: rotate(-12deg);
    transform-origin: left center;
    z-index: 5;
    pointer-events: none;
}

/* ── Section 6: Final Void ── */
#final-void {
    min-height: 100vh;
    position: relative;
}

/* ── Star pulse animation ── */
@keyframes star-pulse {
    0%   { opacity: 0.9; transform: scale(1); }
    50%  { opacity: 1; transform: scale(2.5); filter: drop-shadow(0 0 6px var(--magenta)); }
    100% { opacity: 0.9; transform: scale(1); }
}

.star-pulse-once {
    animation: star-pulse 0.8s var(--ease-out) forwards;
}

/* ── Element emergence animation ── */
@keyframes emerge {
    from {
        opacity: 0;
        transform: translateY(-12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.emergence-anchor {
    opacity: 0;
    animation: emerge 0.9s var(--spring) 0.3s forwards;
}

/* ── Scrollbar ── */
::-webkit-scrollbar {
    width: 2px;
}
::-webkit-scrollbar-track {
    background: var(--void);
}
::-webkit-scrollbar-thumb {
    background: var(--slate);
    opacity: 0.4;
}

/* ── Selection ── */
::selection {
    background: var(--magenta);
    color: var(--void);
}