/* =========================================================
   확률.com — Midnight Probability
   Generative dreamscape of uncertainty
   ========================================================= */

:root {
    --void:        #070914;  /* Deep Void */
    --ink:         #0f1a35;  /* Midnight Ink */
    --field:       #1e2f5c;  /* Probability Field */
    --sky:         #7fb3d5;  /* Ethereal Sky */
    --frost:       #b8d8e8;  /* Frost Glow */
    --parchment:   #d4a574;  /* Faded Parchment */
    --cinnabar:    #e85d4a;  /* Cinnabar Spark */
    --bone:        #e8e4dd;  /* Bone Paper */

    --display: 'Fraunces', 'Spectral', serif;
    --ko-serif: 'Gowun Batang', 'Fraunces', serif;
    --latin-serif: 'Spectral', 'Fraunces', serif;
    --mono: 'JetBrains Mono', 'Courier New', monospace;
}

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

html, body {
    background: var(--void);
    color: var(--parchment);
    font-family: var(--latin-serif);
    font-weight: 300;
    overflow-x: hidden;
    min-height: 100%;
    scroll-behavior: smooth;
    cursor: crosshair;
}

body {
    position: relative;
    background:
        radial-gradient(ellipse at 20% 10%, rgba(30, 47, 92, 0.45) 0%, transparent 55%),
        radial-gradient(ellipse at 85% 85%, rgba(15, 26, 53, 0.7) 0%, transparent 60%),
        var(--void);
}

/* Global canvas */
#global-canvas {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
    z-index: 0;
    pointer-events: none;
    display: block;
}

#page {
    position: relative;
    z-index: 1;
}

/* ----------------- Stratum ----------------- */
.stratum {
    position: relative;
    min-height: 100vh;
    padding: 6vh 7vw;
    overflow: hidden;
    --visibility: 0;
    transition: opacity 1.8s ease;
}

.stratum-meta {
    position: absolute;
    top: 3.5vh;
    left: 4vw;
    display: flex;
    gap: 1.5rem;
    align-items: baseline;
    font-family: var(--mono);
    font-size: 11px;
    font-weight: 300;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--sky);
    opacity: 0.55;
}
.stratum-meta .roman {
    font-family: var(--display);
    font-size: 1.6rem;
    font-style: italic;
    font-weight: 300;
    letter-spacing: 0.04em;
    color: var(--bone);
    opacity: 0.4;
}
.stratum-meta .greek {
    font-family: var(--display);
    font-style: italic;
    font-size: 1rem;
    color: var(--parchment);
    letter-spacing: 0.02em;
}
.stratum-meta .tag-en { color: var(--parchment); }
.stratum-meta .tag-ko {
    font-family: var(--ko-serif);
    color: var(--sky);
    letter-spacing: 0.1em;
}

/* Corner fiducial marks */
.corner-marks {
    position: absolute;
    inset: 4vh 4vw;
    pointer-events: none;
    z-index: 2;
}
.corner-marks .cm {
    position: absolute;
    font-family: var(--mono);
    font-size: 1.4rem;
    color: var(--sky);
    opacity: 0.35;
}
.corner-marks .tl { top: 0; left: 0; }
.corner-marks .tr { top: 0; right: 0; transform: rotate(90deg); }
.corner-marks .bl { bottom: 0; left: 0; transform: rotate(-90deg); }
.corner-marks .br { bottom: 0; right: 0; transform: rotate(180deg); }

/* Hairline rule dividers */
.rule-divider {
    position: absolute;
    bottom: 0;
    left: 7vw;
    right: 7vw;
    height: 1px;
    background: linear-gradient(to right,
        transparent 0%,
        rgba(127, 179, 213, 0.25) 20%,
        rgba(127, 179, 213, 0.25) 80%,
        transparent 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    pointer-events: none;
}
.rule-mark {
    position: absolute;
    top: -14px;
    background: var(--void);
    padding: 0 14px;
    font-family: var(--display);
    font-style: italic;
    font-size: 1.3rem;
    color: var(--parchment);
    opacity: 0.7;
}

/* --------- Probability Cloud Headings --------- */
.cloud-word {
    position: relative;
    font-family: var(--display);
    font-weight: 300;
    font-style: italic;
    font-size: clamp(4rem, 14vw, 11rem);
    color: var(--bone);
    line-height: 0.95;
    letter-spacing: -0.015em;
    white-space: nowrap;
    font-variation-settings: "opsz" 144, "SOFT" 100;
    will-change: transform;
    user-select: none;
}
.cloud-word .letter {
    position: relative;
    display: inline-block;
    vertical-align: baseline;
}
.cloud-word .canonical {
    position: relative;
    z-index: 2;
    display: inline-block;
    opacity: 0.95;
    color: var(--bone);
}
.cloud-word .ghost-layer {
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 1;
}
.cloud-word .ghost {
    position: absolute;
    top: 0;
    left: 0;
    color: var(--sky);
    will-change: transform, opacity;
    pointer-events: none;
}

.cloud-word.subtitle {
    font-size: clamp(3rem, 9vw, 7rem);
    margin-bottom: 2rem;
}
.cloud-word.subtitle.center { text-align: center; margin: 0 auto 2rem; }
.cloud-word.subtitle.right { text-align: right; margin-left: auto; }

/* ----------------- Hero ----------------- */
.hero {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    min-height: 80vh;
    padding-left: 2vw;
}
.hero .cloud-word {
    margin-bottom: 4rem;
    font-size: clamp(6rem, 20vw, 16rem);
}

/* ----------------- Aphorisms ----------------- */
.aphorism {
    max-width: 38ch;
    margin-top: 0.6rem;
    line-height: 1.9;
    font-size: clamp(0.9rem, 1.05vw, 1.1rem);
}
.aphorism.ko {
    font-family: var(--ko-serif);
    font-weight: 400;
    color: var(--frost);
    letter-spacing: 0.01em;
}
.aphorism.en {
    font-family: var(--latin-serif);
    font-style: italic;
    font-weight: 300;
    color: var(--parchment);
    opacity: 0.7;
    letter-spacing: 0.015em;
}
.aphorism.side-note {
    font-size: 0.9rem;
    max-width: 30ch;
    position: absolute;
    top: 14vh;
    right: 5vw;
    text-align: right;
}
.aphorism.side-note.en { top: calc(14vh + 4rem); }

.formula {
    margin-top: 1.8rem;
    font-family: var(--mono);
    font-weight: 300;
    font-size: 11px;
    letter-spacing: 0.1em;
    color: var(--sky);
    opacity: 0.5;
}
.formula.mono { font-family: var(--mono); }

/* ----------------- Nav ----------------- */
#stratum-nav {
    position: fixed;
    top: 50%;
    right: 2.2vw;
    transform: translateY(-50%);
    z-index: 20;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    padding: 1.5rem 0.8rem;
    border-left: 1px solid rgba(127, 179, 213, 0.2);
    pointer-events: auto;
}
#stratum-nav .nav-greek {
    font-family: var(--display);
    font-style: italic;
    color: var(--parchment);
    font-size: 1rem;
    text-align: center;
    opacity: 0.55;
    margin-bottom: 0.6rem;
}
#stratum-nav .nav-dot {
    position: relative;
    display: block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: transparent;
    border: 1px solid var(--sky);
    opacity: 0.45;
    transition: opacity 0.35s, transform 0.35s, background 0.35s;
    text-decoration: none;
    margin-left: auto;
    margin-right: auto;
}
/* Logarithmic spacing */
#stratum-nav .nav-dot[data-stratum="1"] { margin-top: 0.3rem; }
#stratum-nav .nav-dot[data-stratum="2"] { margin-top: 0.6rem; }
#stratum-nav .nav-dot[data-stratum="3"] { margin-top: 1.0rem; }
#stratum-nav .nav-dot[data-stratum="4"] { margin-top: 1.7rem; }
#stratum-nav .nav-dot[data-stratum="5"] { margin-top: 2.7rem; }
#stratum-nav .nav-dot[data-stratum="6"] { margin-top: 4.2rem; }

#stratum-nav .nav-dot:hover {
    opacity: 1;
    background: var(--sky);
    transform: scale(1.4);
}
#stratum-nav .nav-dot.active {
    background: var(--cinnabar);
    border-color: var(--cinnabar);
    opacity: 1;
}
#stratum-nav .nav-label {
    position: absolute;
    right: 18px;
    top: 50%;
    transform: translateY(-50%);
    font-family: var(--ko-serif);
    font-size: 10px;
    letter-spacing: 0.12em;
    color: var(--frost);
    opacity: 0;
    pointer-events: none;
    white-space: nowrap;
    transition: opacity 0.3s;
}
#stratum-nav .nav-dot:hover .nav-label {
    opacity: 0.9;
}

/* ----------------- HUD ----------------- */
#hud {
    position: fixed;
    top: 2.5vh;
    right: 4vw;
    z-index: 20;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    font-family: var(--mono);
    font-size: 10px;
    font-weight: 300;
    color: var(--sky);
    opacity: 0.55;
    letter-spacing: 0.1em;
    pointer-events: none;
    text-align: right;
}
#hud .hud-key { color: var(--parchment); opacity: 0.8; }

/* ----------------- Stratum 2: Sample Space ----------------- */
#stratum-2 { padding-bottom: 14vh; }
.tile-field {
    position: relative;
    width: 100%;
    height: 74vh;
    margin-top: 3rem;
}
.tile {
    position: absolute;
    width: 120px;
    height: 120px;
    border: 1px solid rgba(127, 179, 213, 0.25);
    background: rgba(15, 26, 53, 0.4);
    backdrop-filter: blur(1px);
    transition: transform 0.5s cubic-bezier(0.2, 0.9, 0.2, 1),
                opacity 0.5s ease,
                border-color 0.5s ease,
                z-index 0s;
    overflow: hidden;
    will-change: transform, opacity;
}
.tile::before {
    content: attr(data-label);
    position: absolute;
    top: 4px;
    left: 6px;
    font-family: var(--mono);
    font-size: 8px;
    letter-spacing: 0.1em;
    color: var(--sky);
    opacity: 0.55;
    z-index: 3;
    pointer-events: none;
}
.tile::after {
    content: attr(data-id);
    position: absolute;
    bottom: 4px;
    right: 6px;
    font-family: var(--mono);
    font-size: 8px;
    color: var(--parchment);
    opacity: 0.45;
    z-index: 3;
    pointer-events: none;
}
.tile canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
}
.tile:hover {
    transform: scale(1.18) rotate(0deg) !important;
    border-color: var(--cinnabar);
    z-index: 10;
}
.tile-field.has-hover .tile:not(:hover) {
    opacity: 0.12;
}

/* ----------------- Stratum 3: Distribution ----------------- */
#stratum-3 {
    min-height: 110vh;
    padding: 10vh 0 10vh 0;
}
.diagonal-band {
    position: relative;
    width: 120vw;
    margin-left: -10vw;
    height: 60vh;
    transform: rotate(-6deg);
    background: linear-gradient(to bottom,
        transparent,
        rgba(15, 26, 53, 0.55) 20%,
        rgba(15, 26, 53, 0.55) 80%,
        transparent);
    border-top: 1px solid rgba(127, 179, 213, 0.2);
    border-bottom: 1px solid rgba(127, 179, 213, 0.2);
    overflow: hidden;
}
.band-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
}
.band-overlay {
    position: absolute;
    top: 50%;
    left: 8vw;
    transform: translateY(-50%) rotate(6deg);
    max-width: 40ch;
    z-index: 2;
}
#stratum-3 .cloud-word.subtitle.right {
    position: absolute;
    bottom: 12vh;
    right: 7vw;
    opacity: 0.85;
}

/* ----------------- Stratum 4: Markov ----------------- */
#stratum-4 {
    padding: 8vh 3vw 10vh;
}
#stratum-4 .cloud-word.subtitle {
    padding-left: 4vw;
}
.ribbon-stack {
    position: relative;
    margin-top: 3rem;
    display: flex;
    flex-direction: column;
    gap: 2.2rem;
}
.ribbon {
    position: relative;
    width: 140%;
    margin-left: -20%;
    padding: 1rem 4vw;
    background: linear-gradient(to right,
        transparent 0%,
        rgba(15, 26, 53, 0.3) 15%,
        rgba(15, 26, 53, 0.3) 85%,
        transparent 100%);
    border-top: 1px solid rgba(127, 179, 213, 0.12);
    border-bottom: 1px solid rgba(127, 179, 213, 0.12);
    overflow: hidden;
    will-change: transform;
}
.ribbon[data-depth="1"] { opacity: 0.95; }
.ribbon[data-depth="2"] { opacity: 0.78; }
.ribbon[data-depth="3"] { opacity: 0.6; }

.ribbon-head {
    display: flex;
    align-items: baseline;
    gap: 1.4rem;
    margin-bottom: 0.6rem;
    font-size: 12px;
    letter-spacing: 0.1em;
    padding-left: 22%;
}
.ribbon-num {
    font-family: var(--mono);
    color: var(--sky);
    opacity: 0.6;
}
.ribbon-title.en {
    font-family: var(--latin-serif);
    font-style: italic;
    color: var(--parchment);
    opacity: 0.8;
}
.ribbon-title.ko {
    font-family: var(--ko-serif);
    color: var(--frost);
    opacity: 0.7;
}
.ribbon-svg {
    display: block;
    width: 100%;
    height: 100px;
    overflow: visible;
}

/* ----------------- Stratum 5: Bayesian Garden ----------------- */
.garden-layout {
    display: grid;
    grid-template-columns: 1.7fr 1fr;
    gap: 4vw;
    margin-top: 2rem;
    align-items: center;
}
.garden-canvas-wrap {
    position: relative;
    width: 100%;
    height: 52vh;
    background:
        linear-gradient(to right, rgba(127, 179, 213, 0.04) 1px, transparent 1px) 0 0 / 40px 40px,
        linear-gradient(to bottom, rgba(127, 179, 213, 0.04) 1px, transparent 1px) 0 0 / 40px 40px,
        rgba(15, 26, 53, 0.18);
    border: 1px solid rgba(127, 179, 213, 0.15);
    overflow: hidden;
}
#bayes-svg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}
#bayes-svg .curve {
    fill: none;
    stroke-width: 1.2;
    transition: d 0.3s;
}
#bayes-svg .curve.prior {
    stroke: var(--sky);
    opacity: 0.7;
}
#bayes-svg .curve.likelihood {
    stroke: var(--parchment);
    opacity: 0.85;
    stroke-dasharray: 4 3;
}
#bayes-svg .curve.posterior {
    stroke: var(--cinnabar);
    stroke-width: 1.8;
    opacity: 0.95;
}
.curve-legend {
    position: absolute;
    top: 1rem;
    left: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.1em;
    color: var(--parchment);
    opacity: 0.75;
}
.curve-legend .leg { display: flex; align-items: center; gap: 0.5rem; }
.curve-legend .swatch {
    display: inline-block;
    width: 14px;
    height: 2px;
}
.curve-legend .prior .swatch { background: var(--sky); }
.curve-legend .likelihood .swatch { background: var(--parchment); }
.curve-legend .posterior .swatch { background: var(--cinnabar); }

.garden-controls {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}
.slider-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.35rem;
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.1em;
}
.slider-label {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    color: var(--sky);
    opacity: 0.75;
}
.slider-label .greek-inline {
    font-family: var(--display);
    font-style: italic;
    font-size: 1rem;
    color: var(--parchment);
}
.slider-label .en-inline { font-family: var(--latin-serif); font-style: italic; }

.slider-row input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 1px;
    background: rgba(127, 179, 213, 0.35);
    outline: none;
    margin: 0.4rem 0 0.2rem;
}
.slider-row input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--cinnabar);
    border: 1px solid var(--void);
    cursor: ew-resize;
    box-shadow: 0 0 6px rgba(232, 93, 74, 0.6);
}
.slider-row input[type="range"]::-moz-range-thumb {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--cinnabar);
    border: 1px solid var(--void);
    cursor: ew-resize;
}
.slider-value {
    color: var(--frost);
    opacity: 0.9;
    font-family: var(--mono);
}

/* ----------------- Stratum 6: Convergence ----------------- */
#stratum-6 {
    min-height: 110vh;
    padding: 8vh 7vw;
    position: relative;
}
.full-bleed-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
    z-index: 0;
}
#stratum-6 .stratum-meta,
#stratum-6 .cloud-word,
#stratum-6 .closing {
    position: relative;
    z-index: 2;
}
#stratum-6 .cloud-word.subtitle {
    margin-top: 18vh;
    opacity: 0.9;
    text-align: center;
}
.closing {
    margin-top: 24vh;
    text-align: center;
}
.closing .aphorism {
    margin-left: auto;
    margin-right: auto;
    max-width: 54ch;
    min-height: 1.9em;
}
.closing .aphorism.en { font-size: 0.95rem; }
.closing .formula {
    margin-top: 3rem;
    opacity: 0.35;
    text-align: center;
}

.typewriter .char {
    display: inline-block;
    opacity: 0;
    transition: opacity 0.22s ease;
}
.typewriter .char.revealed { opacity: 1; }
.typewriter .char.spark { color: var(--cinnabar); }

/* ----------------- Responsive ----------------- */
@media (max-width: 820px) {
    #hud { font-size: 9px; }
    #stratum-nav { right: 1.2vw; padding: 1rem 0.4rem; }
    .hero .cloud-word { font-size: clamp(4rem, 24vw, 9rem); }
    .cloud-word.subtitle { font-size: clamp(2.4rem, 12vw, 4.5rem); }
    .garden-layout { grid-template-columns: 1fr; }
    .ribbon { width: 120%; margin-left: -10%; }
    .ribbon-head { padding-left: 12%; }
    .aphorism.side-note { position: static; text-align: left; margin-top: 1rem; }
}