/* ============================================
   reiwa.day — Beautiful Harmony
   Forest-green ceremonial experience
   ============================================ */

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

:root {
    --midnight-forest: #0a1f0a;
    --forest-dark: #0f2b14;
    --cedar-shade: #1a3d22;
    --moss-bank: #2d5a38;
    --living-green: #4a8c5c;
    --sage-mist: #7ab68a;
    --lichen-light: #c8d4c0;
    --plum-gold: #d4a855;
    --bark-brown: #5a3a1a;
    --muted-sage: #5a7a52;
    --bounce-enter: cubic-bezier(0.34, 1.56, 0.64, 1);
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    background: var(--midnight-forest);
    color: var(--lichen-light);
    font-family: 'Source Serif 4', serif;
    font-weight: 300;
    overflow-x: hidden;
}

/* ---- Timeline Thread ---- */
#timeline-thread {
    position: fixed;
    left: 8vw;
    top: 0;
    width: 1px;
    height: 100vh;
    background: var(--living-green);
    z-index: 100;
    opacity: 0.6;
}

#timeline-progress {
    position: absolute;
    top: 0;
    left: -1px;
    width: 3px;
    height: 0%;
    background: var(--plum-gold);
    transition: height 0.1s linear;
    border-radius: 2px;
}

.timeline-node {
    position: absolute;
    left: -3.5px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--living-green);
    transform: scale(0);
    transition: transform 0.6s var(--bounce-enter);
}

.timeline-node.active {
    transform: scale(1);
    background: var(--plum-gold);
}

/* ---- Chamber Shared ---- */
.chamber {
    position: relative;
    min-height: 100vh;
    min-height: 100svh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.chamber-label {
    position: absolute;
    top: 2rem;
    left: 8vw;
    margin-left: 1.5rem;
    font-family: 'IBM Plex Sans', sans-serif;
    font-weight: 300;
    font-size: clamp(0.65rem, 0.9vw, 0.8rem);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--muted-sage);
    z-index: 10;
}

/* ---- Threshold Chamber ---- */
#threshold {
    background: linear-gradient(180deg, var(--forest-dark) 0%, var(--cedar-shade) 50%, var(--forest-dark) 100%);
    flex-direction: column;
}

.threshold-content {
    text-align: center;
    opacity: 0;
    transform: scale(0.85);
    transition: opacity 1.2s ease, transform 1.2s var(--bounce-enter);
}

#threshold.revealed .threshold-content {
    opacity: 1;
    transform: scale(1);
}

#kanji-hero {
    font-family: 'Noto Serif JP', serif;
    font-weight: 900;
    font-size: clamp(8rem, 18vw, 20rem);
    line-height: 1;
    color: var(--lichen-light);
    text-shadow:
        2px 2px 0 var(--cedar-shade),
        4px 4px 0 var(--moss-bank),
        6px 6px 0 rgba(42, 90, 56, 0.5),
        8px 8px 0 rgba(42, 90, 56, 0.3),
        10px 10px 20px rgba(10, 31, 10, 0.8);
    margin-bottom: 1rem;
}

.reiwa-line {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
}

#reiwa-romanized {
    font-family: 'Fraunces', serif;
    font-size: clamp(2rem, 5vw, 4rem);
    font-variation-settings: 'wght' 300, 'WONK' 1, 'opsz' 72;
    color: var(--sage-mist);
    letter-spacing: 0.04em;
    animation: breathe 4s ease-in-out infinite;
}

@keyframes breathe {
    0%, 100% { font-variation-settings: 'wght' 300, 'WONK' 1, 'opsz' 72; }
    50% { font-variation-settings: 'wght' 600, 'WONK' 1, 'opsz' 72; }
}

.timeline-horizontal {
    height: 1px;
    flex: 1;
    max-width: 40vw;
    background: linear-gradient(90deg, var(--living-green), transparent);
}

.threshold-subtitle {
    font-family: 'IBM Plex Sans', sans-serif;
    font-weight: 300;
    font-size: clamp(0.65rem, 0.9vw, 0.8rem);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--muted-sage);
    margin-top: 2rem;
}

/* ---- Meaning Chamber ---- */
#meaning {
    background: var(--forest-dark);
}

.meaning-layout {
    display: flex;
    width: 100%;
    height: 100vh;
    height: 100svh;
}

.meaning-canvas-wrap {
    width: 60%;
    height: 100%;
    position: relative;
}

#blossom-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.meaning-text {
    width: 40%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 4rem;
    background: linear-gradient(135deg, var(--forest-dark) 0%, var(--midnight-forest) 100%);
}

.meaning-heading {
    font-family: 'Fraunces', serif;
    font-weight: 600;
    font-size: clamp(3rem, 7vw, 6rem);
    font-variation-settings: 'WONK' 1, 'opsz' 72;
    letter-spacing: 0.04em;
    color: var(--sage-mist);
    margin-bottom: 2rem;
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s var(--bounce-enter);
}

#meaning.revealed .meaning-heading {
    opacity: 1;
    transform: translateY(0);
}

.manyoshu-poem {
    font-family: 'Source Serif 4', serif;
    font-weight: 400;
    font-size: clamp(1rem, 1.4vw, 1.25rem);
    line-height: 1.85;
    color: var(--lichen-light);
    border: none;
    margin-bottom: 1.5rem;
}

.poem-word {
    opacity: 0;
    transition: opacity 0.4s ease;
    display: inline;
}

#meaning.revealed .poem-word.visible {
    opacity: 1;
}

.meaning-source {
    font-family: 'IBM Plex Sans', sans-serif;
    font-weight: 300;
    font-size: clamp(0.65rem, 0.9vw, 0.8rem);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--muted-sage);
}

/* ---- Epoch Chamber ---- */
#epoch {
    background: linear-gradient(180deg, var(--forest-dark) 0%, var(--cedar-shade) 50%, var(--midnight-forest) 100%);
}

.epoch-panels {
    display: flex;
    gap: 2rem;
    padding: 2rem;
    perspective: 1000px;
    max-width: 1200px;
    width: 100%;
}

.epoch-panel {
    flex: 1;
    padding: 3rem 2.5rem;
    border-radius: 4px;
    text-align: center;
    opacity: 0;
    transform: translateY(60px);
    transition: opacity 0.8s ease, transform 0.8s var(--bounce-enter);
}

@supports (backdrop-filter: blur(20px)) {
    .epoch-panel {
        background: rgba(42, 90, 56, 0.4);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
    }
}

@supports not (backdrop-filter: blur(20px)) {
    .epoch-panel {
        background: rgba(42, 90, 56, 0.75);
    }
}

#epoch.revealed .epoch-panel {
    opacity: 1;
    transform: translateY(0);
}

#epoch.revealed .panel-harmony { transition-delay: 0s; }
#epoch.revealed .panel-beauty { transition-delay: 0.2s; }
#epoch.revealed .panel-renewal { transition-delay: 0.4s; }

.panel-kanji {
    font-family: 'Noto Serif JP', serif;
    font-weight: 900;
    font-size: clamp(3rem, 6vw, 5rem);
    color: var(--plum-gold);
    display: block;
    margin-bottom: 1rem;
}

.epoch-panel h3 {
    font-family: 'Fraunces', serif;
    font-weight: 600;
    font-size: clamp(1.5rem, 3vw, 2.2rem);
    font-variation-settings: 'WONK' 1, 'opsz' 72;
    letter-spacing: 0.04em;
    color: var(--sage-mist);
    margin-bottom: 1rem;
}

.epoch-panel p {
    font-family: 'Source Serif 4', serif;
    font-weight: 300;
    font-size: clamp(0.9rem, 1.2vw, 1.1rem);
    line-height: 1.85;
    color: var(--lichen-light);
}

/* ---- Seasons Chamber ---- */
.chamber-seasons {
    flex-direction: column;
    min-height: 400vh;
    min-height: 400svh;
}

.season {
    position: relative;
    width: 100%;
    min-height: 100vh;
    min-height: 100svh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.season-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.season-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.season-kanji {
    font-family: 'Noto Serif JP', serif;
    font-weight: 900;
    font-size: clamp(6rem, 14vw, 16rem);
    display: block;
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s var(--bounce-enter);
}

.season.revealed .season-kanji {
    opacity: 1;
    transform: translateY(0);
}

.season-name {
    font-family: 'Fraunces', serif;
    font-weight: 300;
    font-size: clamp(1rem, 2vw, 1.5rem);
    letter-spacing: 0.04em;
    color: var(--sage-mist);
    display: block;
    margin-top: 1rem;
    opacity: 0;
    transition: opacity 0.8s ease 0.3s;
}

.season.revealed .season-name {
    opacity: 1;
}

/* Spring */
.season-spring {
    background: var(--forest-dark);
}

.season-spring .season-kanji {
    color: #e8c4c4;
}

.spring-ripples {
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0.5;
}

.ripple {
    transform-origin: center;
    opacity: 0;
}

.season-spring.revealed .r1 { animation: rippleExpand 2s var(--bounce-enter) 0s forwards; }
.season-spring.revealed .r2 { animation: rippleExpand 2s var(--bounce-enter) 0.3s forwards; }
.season-spring.revealed .r3 { animation: rippleExpand 2s var(--bounce-enter) 0.6s forwards; }
.season-spring.revealed .r4 { animation: rippleExpand 2s var(--bounce-enter) 0.9s forwards; }
.season-spring.revealed .r5 { animation: rippleExpand 2s var(--bounce-enter) 1.2s forwards; }

@keyframes rippleExpand {
    0% { transform: scale(0); opacity: 0; }
    50% { opacity: 0.6; }
    100% { transform: scale(1); opacity: 0.2; }
}

/* Summer */
.season-summer {
    background: var(--cedar-shade);
}

.season-summer .season-kanji {
    color: var(--plum-gold);
}

.summer-shimmer {
    background:
        repeating-linear-gradient(0deg, transparent, rgba(74, 140, 92, 0.15) 2px, transparent 4px),
        repeating-linear-gradient(0deg, transparent, rgba(212, 168, 85, 0.1) 3px, transparent 6px);
    background-size: 100% 8px, 100% 12px;
    animation: shimmer1 3s ease-in-out infinite alternate, shimmer2 5s ease-in-out infinite alternate;
}

@keyframes shimmer1 {
    0% { transform: translateY(0); }
    100% { transform: translateY(8px); }
}

@keyframes shimmer2 {
    0% { background-position: 0 0, 0 0; }
    100% { background-position: 0 12px, 0 -8px; }
}

/* Autumn */
.season-autumn {
    background: linear-gradient(180deg, var(--forest-dark) 0%, #1a2a14 100%);
}

.season-autumn .season-kanji {
    color: #d4a855;
}

.leaf {
    position: absolute;
    width: 20px;
    height: 30px;
    clip-path: polygon(50% 0%, 85% 35%, 70% 100%, 30% 100%, 15% 35%);
    opacity: 0;
}

.season-autumn.revealed .leaf {
    animation: fallLeaf var(--fall-duration, 8s) ease-in-out var(--fall-delay, 0s) infinite;
}

.leaf-1 { left: 10%; --fall-duration: 7s; --fall-delay: 0s; background: #d4a855; }
.leaf-2 { left: 25%; --fall-duration: 9s; --fall-delay: 1.2s; background: #8c6a2e; }
.leaf-3 { left: 40%; --fall-duration: 6s; --fall-delay: 0.5s; background: #5a3a1a; }
.leaf-4 { left: 55%; --fall-duration: 11s; --fall-delay: 2s; background: #d4a855; }
.leaf-5 { left: 70%; --fall-duration: 8s; --fall-delay: 0.8s; background: #8c6a2e; }
.leaf-6 { left: 85%; --fall-duration: 10s; --fall-delay: 1.5s; background: #5a3a1a; }
.leaf-7 { left: 15%; --fall-duration: 12s; --fall-delay: 3s; background: #d4a855; }
.leaf-8 { left: 35%; --fall-duration: 7.5s; --fall-delay: 0.3s; background: #8c6a2e; }
.leaf-9 { left: 50%; --fall-duration: 9.5s; --fall-delay: 1.8s; background: #5a3a1a; }
.leaf-10 { left: 65%; --fall-duration: 6.5s; --fall-delay: 2.5s; background: #d4a855; }
.leaf-11 { left: 80%; --fall-duration: 10.5s; --fall-delay: 0.7s; background: #8c6a2e; }
.leaf-12 { left: 92%; --fall-duration: 8.5s; --fall-delay: 1s; background: #5a3a1a; }

@keyframes fallLeaf {
    0% { top: -5%; opacity: 0; transform: rotate(0deg) translateX(0); }
    10% { opacity: 0.7; }
    50% { transform: rotate(180deg) translateX(30px); }
    90% { opacity: 0.5; }
    100% { top: 105%; opacity: 0; transform: rotate(360deg) translateX(-20px); }
}

/* Winter */
.season-winter {
    background: var(--midnight-forest);
}

.season-winter .season-kanji {
    color: var(--lichen-light);
}

#frost-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

/* ---- Stillness Chamber ---- */
#stillness {
    background: var(--midnight-forest);
    flex-direction: column;
}

#candle-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.stillness-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.stillness-title {
    font-family: 'Noto Serif JP', serif;
    font-weight: 400;
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    color: var(--lichen-light);
    opacity: 0.15;
    transition: opacity 3s ease;
}

#stillness.revealed .stillness-title {
    opacity: 0.9;
}

.hidden-poem {
    font-family: 'Source Serif 4', serif;
    font-weight: 300;
    font-size: clamp(1rem, 1.4vw, 1.25rem);
    line-height: 1.85;
    color: var(--sage-mist);
    margin-top: 2rem;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 2s ease, transform 2s ease;
}

#stillness.poem-visible .hidden-poem {
    opacity: 1;
    transform: translateY(0);
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
    #kanji-hero {
        font-size: clamp(4rem, 12vw, 8rem);
    }

    .meaning-layout {
        flex-direction: column;
    }

    .meaning-canvas-wrap {
        width: 100%;
        height: 50vh;
    }

    .meaning-text {
        width: 100%;
        padding: 2rem;
    }

    .epoch-panels {
        flex-direction: column;
    }

    .season-kanji {
        font-size: clamp(4rem, 12vw, 8rem);
    }
}

@media (max-width: 480px) {
    #timeline-thread {
        display: none;
    }

    .chamber-label {
        left: 1rem;
        margin-left: 0;
    }

    #kanji-hero {
        font-size: clamp(3rem, 10vw, 6rem);
    }
}