/* ============================================
   haroo.day — One Spring Day
   Ukiyo-e woodblock meets risograph print
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    --pre-dawn: #1A1B2E;
    --dawn-step-2: #2A2B4E;
    --dawn-step-3: #3A3B6E;
    --dawn-step-4: #5A5B8E;
    --first-light: #E8D4B8;
    --hanji-cream: #F7F0E4;
    --blossom-coral: #E8A0A0;
    --spring-celadon: #A8C8B4;
    --afternoon-gold: #E8D494;
    --golden-cream: #F4ECD4;
    --twilight-lavender: #D4C8D8;
    --night-return: #2A2030;
    --sumi-ink: #2A2A2E;
    --stone-grey: #8A8A94;
    --petal-accent: #D4868A;
}

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

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

body {
    font-family: 'Inter', sans-serif;
    font-weight: 300;
    font-size: 17px;
    line-height: 1.85;
    color: var(--sumi-ink);
    overflow-x: hidden;
    background: var(--pre-dawn);
}

/* --- Paper Grain Texture (global) --- */
body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1000;
    opacity: 0.06;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='256' height='256' filter='url(%23noise)' opacity='0.5'/%3E%3C/svg%3E");
    background-size: 256px 256px;
}

/* --- Progress Bar --- */
#progress-bar {
    position: fixed;
    left: 0;
    top: 0;
    width: 2px;
    height: 100vh;
    z-index: 999;
    display: flex;
    flex-direction: column;
}

.progress-segment {
    flex: 1;
    cursor: pointer;
    position: relative;
}

#progress-indicator {
    position: absolute;
    left: -2px;
    top: 0;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #fff;
    transition: top 0.15s ease;
    z-index: 1001;
    box-shadow: 0 0 4px rgba(0,0,0,0.3);
}

/* --- Fold Sections --- */
.fold {
    position: relative;
    scroll-snap-align: start;
}

/* ===========================
   DAWN FOLD (0-180vh)
   =========================== */
#dawn {
    height: 180vh;
    background: var(--pre-dawn);
    position: relative;
    overflow: hidden;
}

.dawn-watermark {
    position: absolute;
    top: 20vh;
    left: 50%;
    transform: translateX(-50%);
    font-family: 'Noto Serif JP', serif;
    font-weight: 900;
    font-size: 40vw;
    color: var(--first-light);
    opacity: 0.03;
    pointer-events: none;
    line-height: 1;
    white-space: nowrap;
}

/* Dawn color planes */
.color-plane {
    position: absolute;
    left: 0;
    width: 100%;
    pointer-events: none;
}

.dawn-plane-1 {
    top: 0;
    height: 45vh;
    background: var(--pre-dawn);
}

.dawn-plane-2 {
    top: 45vh;
    height: 45vh;
    background: var(--dawn-step-2);
    opacity: 0;
    transition: opacity 0.6s ease;
}

.dawn-plane-3 {
    top: 90vh;
    height: 45vh;
    background: var(--dawn-step-3);
    opacity: 0;
    transition: opacity 0.6s ease;
}

.dawn-plane-4 {
    top: 135vh;
    height: 45vh;
    background: var(--dawn-step-4);
    opacity: 0;
    transition: opacity 0.6s ease;
}

.dawn-plane-2.visible,
.dawn-plane-3.visible,
.dawn-plane-4.visible {
    opacity: 1;
}

/* Dawn horizon band */
.dawn-horizon {
    position: absolute;
    top: 60vh;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--first-light);
    opacity: 0;
    transition: opacity 2s ease;
    box-shadow: 0 0 40px 20px rgba(232, 212, 184, 0.15);
}

.dawn-horizon.visible {
    opacity: 1;
}

/* Dawn title */
.dawn-title-container {
    position: absolute;
    top: 40vh;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    z-index: 10;
}

#domain-title {
    font-family: 'Noto Serif JP', serif;
    font-weight: 200;
    font-size: 10vw;
    color: var(--hanji-cream);
    letter-spacing: 0.02em;
    white-space: nowrap;
}

#domain-title .letter {
    display: inline-block;
    opacity: 0;
    transition: opacity 0.8s ease;
}

#domain-title .letter.visible {
    opacity: 1;
}

.dual-meaning {
    display: flex;
    justify-content: space-between;
    gap: 60px;
    margin-top: 20px;
    opacity: 0;
    transition: opacity 1s ease;
}

.dual-meaning.visible {
    opacity: 0.3;
}

.meaning-left, .meaning-right {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 400;
    font-size: 12px;
    letter-spacing: 0.08em;
    color: var(--first-light);
}

/* Cherry Branch */
#cherry-branch-container {
    position: absolute;
    top: 120vh;
    right: -100%;
    width: 50vw;
    min-width: 400px;
    z-index: 10;
    transition: right 1.2s ease-out;
}

#cherry-branch-container.visible {
    right: -5%;
}

#cherry-branch {
    width: 100%;
    height: auto;
}

.blossom {
    transition: fill 0.3s ease;
}

.blossom.filled {
    fill: var(--blossom-coral);
}

.blossom.emptying {
    fill: none;
    transition: fill 0.5s ease;
}


/* ===========================
   BLOOM FOLD (180-380vh)
   =========================== */
#bloom {
    height: 200vh;
    background: var(--hanji-cream);
    position: relative;
    padding: 80px 10% 80px;
    overflow: hidden;
}

.bloom-watermark {
    position: absolute;
    top: 30vh;
    left: 50%;
    transform: translateX(-50%);
    font-family: 'Noto Serif JP', serif;
    font-weight: 900;
    font-size: 35vw;
    color: var(--sumi-ink);
    opacity: 0.02;
    pointer-events: none;
    line-height: 1;
}

.bloom-section-marker,
.afternoon-section-marker,
.dusk-section-marker {
    margin-bottom: 60px;
    padding-top: 60px;
}

.marker-korean {
    display: block;
    font-family: 'Noto Serif JP', serif;
    font-weight: 700;
    font-size: 42px;
    color: var(--sumi-ink);
    margin-bottom: 4px;
}

.marker-english {
    display: block;
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 400;
    font-size: 11px;
    letter-spacing: 0.08em;
    color: var(--stone-grey);
    text-transform: uppercase;
}

/* Accordion Panels */
.accordion-panel {
    position: relative;
    max-height: 40px;
    overflow: hidden;
    transition: max-height 0.6s ease-out;
    margin-bottom: 30px;
    cursor: pointer;
    background: var(--hanji-cream);
}

.accordion-panel.expanded {
    max-height: 600px;
    cursor: default;
}

/* Risograph Misregistration Overlay */
.accordion-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    mix-blend-mode: multiply;
    opacity: 0;
    transform: translate(0, 0);
    transition: opacity 0.4s ease, transform 0.4s ease;
    pointer-events: none;
    z-index: 1;
    will-change: transform;
}

.accordion-panel.expanded::before {
    opacity: 0.18;
    transform: translate(var(--riso-offset-x, 2px), var(--riso-offset-y, 2px));
}

.accordion-panel[data-riso-color="coral"]::before {
    background: var(--blossom-coral);
}

.accordion-panel[data-riso-color="celadon"]::before {
    background: var(--spring-celadon);
}

.accordion-panel[data-riso-color="gold"]::before {
    background: var(--afternoon-gold);
}

.panel-header {
    height: 40px;
    display: flex;
    align-items: center;
    padding: 0 20px;
}

.panel-teaser {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 400;
    font-size: 11px;
    letter-spacing: 0.12em;
    color: var(--stone-grey);
    text-transform: uppercase;
}

.panel-content {
    padding: 20px 20px 40px;
    opacity: 0;
    transition: opacity 0.5s ease 0.3s;
    position: relative;
    z-index: 2;
}

.accordion-panel.expanded .panel-content {
    opacity: 1;
}

.panel-content p {
    font-family: 'Inter', sans-serif;
    font-weight: 300;
    font-size: 17px;
    line-height: 1.85;
    color: var(--sumi-ink);
    margin-bottom: 1.2em;
    max-width: 640px;
}

.panel-content p:last-child {
    margin-bottom: 0;
}


/* ===========================
   AFTERNOON FOLD (380-560vh)
   =========================== */
#afternoon {
    height: 180vh;
    background: var(--golden-cream);
    position: relative;
    padding: 80px 10% 80px;
    overflow: hidden;
}

.afternoon-watermark {
    position: absolute;
    top: 25vh;
    left: 50%;
    transform: translateX(-50%);
    font-family: 'Noto Serif JP', serif;
    font-weight: 900;
    font-size: 40vw;
    color: var(--sumi-ink);
    opacity: 0.03;
    pointer-events: none;
    line-height: 1;
}

/* Cloud SVGs */
.cloud {
    position: absolute;
    pointer-events: none;
    z-index: 1;
}

.cloud-1 {
    top: 15%;
    right: 5%;
    width: 250px;
    animation: cloud-drift-1 60s infinite ease-in-out;
}

.cloud-2 {
    top: 45%;
    left: 8%;
    width: 200px;
    animation: cloud-drift-2 55s infinite ease-in-out;
}

.cloud-3 {
    top: 70%;
    right: 15%;
    width: 180px;
    animation: cloud-drift-3 65s infinite ease-in-out;
}

@keyframes cloud-drift-1 {
    0%, 100% { transform: translateX(0); }
    50% { transform: translateX(-30px); }
}

@keyframes cloud-drift-2 {
    0%, 100% { transform: translateX(0); }
    50% { transform: translateX(25px); }
}

@keyframes cloud-drift-3 {
    0%, 100% { transform: translateX(0); }
    50% { transform: translateX(-20px); }
}

/* Offset Cards */
.offset-card {
    position: relative;
    max-width: 520px;
    padding: 40px 30px;
    margin-bottom: 80px;
    border-left: 4px solid var(--spring-celadon);
    opacity: 0;
    transform: translateX(-20px);
    transition: opacity 0.5s ease-out, transform 0.5s ease-out;
    z-index: 2;
}

.offset-card.visible {
    opacity: 1;
    transform: translateX(0);
}

.card-left {
    margin-left: 10%;
    border-left-color: var(--spring-celadon);
}

.card-right {
    margin-left: 50%;
    border-left-color: var(--blossom-coral);
    transform: translateX(20px);
}

.card-right.visible {
    transform: translateX(0);
}

.offset-card:nth-child(odd) .offset-card.card-left {
    border-left-color: var(--pre-dawn);
}

.offset-card p {
    font-family: 'Inter', sans-serif;
    font-weight: 300;
    font-size: 17px;
    line-height: 1.85;
    color: var(--sumi-ink);
    margin-bottom: 1.2em;
}

.offset-card p:last-child {
    margin-bottom: 0;
}


/* ===========================
   DUSK FOLD (560-720vh)
   =========================== */
#dusk {
    min-height: 160vh;
    position: relative;
    overflow: hidden;
    background: var(--twilight-lavender);
    padding: 80px 10% 120px;
}

.dusk-plane-1 {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 50%;
    background: var(--twilight-lavender);
    z-index: 0;
}

.dusk-plane-2 {
    position: absolute;
    top: 45%;
    left: 0;
    width: 100%;
    height: 55%;
    background: var(--night-return);
    z-index: 0;
}

/* Soft transition zone between dusk planes */
.dusk-plane-2::before {
    content: '';
    position: absolute;
    top: -50px;
    left: 0;
    width: 100%;
    height: 50px;
    background: var(--night-return);
    opacity: 0.35;
}

/* Falling Petals */
#falling-petals {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 998;
    opacity: 0;
    transition: opacity 1s ease;
}

#falling-petals.active {
    opacity: 1;
}

.petal {
    position: absolute;
    width: 10px;
    height: 14px;
}

.petal-1  { left: 8%;  animation: petal-fall 12s infinite linear -0s, petal-sway 4s infinite ease-in-out -1s; }
.petal-2  { left: 18%; animation: petal-fall 14s infinite linear -2s, petal-sway 3.5s infinite ease-in-out -0.5s; }
.petal-3  { left: 30%; animation: petal-fall 11s infinite linear -4s, petal-sway 4.5s infinite ease-in-out -2s; }
.petal-4  { left: 42%; animation: petal-fall 15s infinite linear -1s, petal-sway 3s infinite ease-in-out -1.5s; }
.petal-5  { left: 55%; animation: petal-fall 13s infinite linear -6s, petal-sway 5s infinite ease-in-out -0s; }
.petal-6  { left: 65%; animation: petal-fall 10s infinite linear -3s, petal-sway 3.8s infinite ease-in-out -2.5s; }
.petal-7  { left: 75%; animation: petal-fall 16s infinite linear -5s, petal-sway 4.2s infinite ease-in-out -1s; }
.petal-8  { left: 85%; animation: petal-fall 12s infinite linear -7s, petal-sway 3.2s infinite ease-in-out -3s; }
.petal-9  { left: 22%; animation: petal-fall 14s infinite linear -8s, petal-sway 4.8s infinite ease-in-out -0.8s; }
.petal-10 { left: 92%; animation: petal-fall 11s infinite linear -3.5s, petal-sway 3.6s infinite ease-in-out -2s; }

@keyframes petal-fall {
    0%   { top: -20px; transform: rotate(0deg); }
    100% { top: 110vh; transform: rotate(360deg); }
}

@keyframes petal-sway {
    0%, 100% { margin-left: 0; }
    50% { margin-left: 15px; }
}

/* Dusk Phrases */
.dusk-phrases {
    position: relative;
    z-index: 5;
    padding-top: 40vh;
}

.dusk-phrase {
    font-family: 'Gowun Batang', serif;
    font-weight: 400;
    font-size: 24px;
    line-height: 2.2;
    letter-spacing: 0.04em;
    text-align: center;
    padding: 15vh 0;
    color: var(--hanji-cream);
    opacity: 0;
    transition: opacity 0.8s ease;
}

.dusk-phrase.visible {
    opacity: 1;
}

.dusk-phrase.faded {
    opacity: 0.2;
    transition: opacity 1.2s ease;
}

/* Dusk Section Marker */
.dusk-section-marker {
    position: relative;
    z-index: 5;
    margin-bottom: 40px;
    padding-top: 60px;
}

.dusk-section-marker .marker-korean {
    color: var(--hanji-cream);
}

.dusk-section-marker .marker-english {
    color: var(--twilight-lavender);
}

/* Final Line */
.dusk-final {
    position: relative;
    z-index: 5;
    text-align: center;
    padding: 20vh 0 10vh;
}

.final-line {
    font-family: 'Gowun Batang', serif;
    font-weight: 400;
    font-size: 28px;
    letter-spacing: 0.04em;
    color: var(--afternoon-gold);
    opacity: 0.4;
    transition: opacity 2s ease;
}

.final-line.fading {
    opacity: 0;
}

.final-translation {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 400;
    font-size: 12px;
    letter-spacing: 0.08em;
    color: var(--stone-grey);
    opacity: 0.3;
    margin-top: 12px;
    transition: opacity 2s ease;
}

.final-translation.fading {
    opacity: 0;
}

/* ===========================
   Reduced Motion
   =========================== */
@media (prefers-reduced-motion: reduce) {
    .petal {
        animation: none !important;
    }

    #falling-petals {
        display: none;
    }

    .cloud {
        animation: none !important;
    }

    .offset-card {
        opacity: 1;
        transform: none;
    }

    #domain-title .letter {
        opacity: 1;
    }

    .dual-meaning {
        opacity: 0.3;
    }

    .dawn-horizon {
        opacity: 1;
    }

    .accordion-panel {
        max-height: none;
    }

    .panel-content {
        opacity: 1;
    }

    .dusk-phrase {
        opacity: 0.8;
    }
}

/* ===========================
   Responsive
   =========================== */
@media (max-width: 768px) {
    #domain-title {
        font-size: 14vw;
    }

    .dual-meaning {
        flex-direction: column;
        gap: 8px;
        align-items: center;
    }

    .offset-card {
        max-width: 100%;
    }

    .card-right {
        margin-left: 15%;
    }

    .card-left {
        margin-left: 5%;
    }

    .dusk-phrase {
        font-size: 20px;
        padding: 10vh 0;
    }

    .panel-content p,
    .offset-card p {
        font-size: 15px;
    }

    .marker-korean {
        font-size: 36px;
    }

    #cherry-branch-container {
        min-width: 280px;
        width: 70vw;
    }
}