/* ============================================
   reiwa.day - Beautiful Harmony
   Design Language: Muji-inflected ceremonial stillness
   ============================================ */

:root {
    --bg-primary: #F7F3EE;
    --bg-deep: #E8E0D4;
    --text-primary: #2C2825;
    --text-secondary: #7A7267;
    --accent-warm: #C4A882;
    --accent-cool: #8B9EAD;
    --highlight: #D4A574;
    --ground: #3D3632;
    --font-display: 'Cormorant Garamond', serif;
    --font-body: 'Sora', sans-serif;
    --font-kanji: 'Noto Serif JP', serif;
    --transition-slow: 1200ms ease-out;
    --transition-medium: 600ms ease-out;
    --grain-opacity: 0.03;
}

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

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

body {
    font-family: var(--font-body);
    font-weight: 300;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* === Washi Paper Grain Overlay === */
#grain-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    opacity: var(--grain-opacity);
}

#grain-overlay::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23g)' opacity='1'/%3E%3C/svg%3E");
    background-size: 300px 300px;
}

/* === Hero Section (Act I) === */
.hero-section {
    position: relative;
    width: 100%;
    min-height: 150vh;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    background-color: var(--bg-primary);
    overflow: hidden;
}

/* Golden-ratio horizontal line at vertical center */
.hero-line {
    position: absolute;
    top: 50%;
    left: 0;
    width: 61.8%;
    height: 0.5px;
    background-color: var(--accent-warm);
    opacity: 0.3;
    transform: translateY(-50%);
}

/* SVG Brushstroke */
.brushstroke-svg {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 80vh;
    z-index: 1;
    pointer-events: none;
}

#brush-path {
    stroke-dasharray: 1200;
    stroke-dashoffset: 1200;
    opacity: 0.08;
    transition: opacity 400ms ease-out;
}

#brush-path.animating {
    opacity: 0.4;
}

#brush-path.static {
    opacity: 0.08;
    stroke-dashoffset: 0;
}

/* Hero Title */
.hero-title {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: clamp(3rem, 8vw, 9rem);
    letter-spacing: 0.12em;
    line-height: 1.1;
    color: var(--text-primary);
    opacity: 0;
    z-index: 2;
    position: relative;
    transition: opacity 2000ms ease-out;
}

.hero-title.visible {
    opacity: 1;
}

/* Datestamp motifs */
.datestamp {
    font-family: var(--font-body);
    font-weight: 300;
    font-size: 10px;
    letter-spacing: 0.03em;
    color: var(--text-secondary);
    opacity: 0.2;
    writing-mode: vertical-rl;
    text-orientation: mixed;
}

.datestamp-hero {
    position: absolute;
    right: 40px;
    bottom: 120px;
    z-index: 2;
}

/* Scroll indicator */
.scroll-indicator {
    position: absolute;
    bottom: 60px;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: opacity var(--transition-slow);
    z-index: 2;
}

.scroll-indicator.visible {
    opacity: 0.3;
}

.scroll-indicator-line {
    width: 0.5px;
    height: 40px;
    background-color: var(--text-secondary);
    animation: scrollPulse 2.5s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { transform: scaleY(1); opacity: 0.3; }
    50% { transform: scaleY(0.5); opacity: 0.6; }
}

/* === Gallery Wrapper (Act II) === */
.gallery-wrapper {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow: hidden;
}

.gallery {
    display: flex;
    height: 100%;
    width: max-content;
    transition: none;
}

/* Individual Panels */
.panel {
    width: 100vw;
    height: 100vh;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    scroll-snap-align: start;
}

.panel-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 40px;
}

/* Panel 1: Date */
.panel-date {
    background-color: var(--bg-primary);
}

.panel-date-text {
    font-family: var(--font-body);
    font-weight: 300;
    font-size: clamp(1.2rem, 2.5vw, 2rem);
    letter-spacing: 0.12em;
    color: var(--text-primary);
    opacity: 0;
    transition: opacity var(--transition-slow);
}

.panel-date-text.visible {
    opacity: 1;
}

/* Mon emblem */
.mon-emblem {
    opacity: 0.08;
    transition: opacity var(--transition-medium);
    animation: monRotate 120s linear infinite;
}

.mon-emblem:hover {
    opacity: 0.25;
}

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

/* Panel horizontal rules */
.panel-rule {
    position: absolute;
    top: 50%;
    left: 0;
    width: 61.8%;
    height: 0.5px;
    background-color: var(--accent-warm);
    opacity: 0.3;
    transform: translateY(-50%);
}

.panel-rule-text {
    top: auto;
    bottom: 120px;
}

/* Panel datestamps */
.datestamp-panel {
    position: absolute;
    right: 30px;
    bottom: 40px;
}

.datestamp-panel-ma {
    position: absolute;
    right: 30px;
    bottom: 40px;
    font-family: var(--font-body);
    font-weight: 300;
    font-size: 10px;
    letter-spacing: 0.03em;
    color: var(--text-secondary);
    opacity: 0.2;
    writing-mode: vertical-rl;
    text-orientation: mixed;
}

/* Panel 2 & 5: Kanji */
.panel-kanji {
    background-color: var(--bg-primary);
}

.kanji-large {
    font-family: var(--font-kanji);
    font-weight: 200;
    font-size: 60vh;
    line-height: 1;
    color: var(--text-primary);
    opacity: 0;
    transition: opacity var(--transition-slow);
}

.kanji-large.visible {
    opacity: 0.12;
}

.kanji-gloss {
    font-family: var(--font-body);
    font-weight: 300;
    font-size: clamp(0.85rem, 1vw, 1rem);
    letter-spacing: 0.03em;
    color: var(--text-secondary);
    opacity: 0;
    transition: opacity var(--transition-slow);
    transition-delay: 400ms;
}

.kanji-large.visible ~ .kanji-gloss {
    opacity: 0.6;
}

/* Panel 3: Ma (empty) panel */
.panel-ma {
    background-color: var(--bg-deep);
}

.panel-ma-line {
    position: absolute;
    top: 50%;
    left: 0;
    width: 61.8%;
    height: 0.5px;
    background-color: var(--accent-warm);
    opacity: 0.3;
    transform: translateY(-50%);
}

/* Panel 4: Text panel */
.panel-text {
    background-color: var(--bg-primary);
    justify-content: flex-start;
    padding-left: 15vw;
    align-items: flex-start;
}

.panel-text-content {
    max-width: 36ch;
    display: flex;
    flex-direction: column;
    gap: 1.5em;
    padding-top: 20vh;
}

.body-text {
    font-family: var(--font-body);
    font-weight: 300;
    font-size: clamp(0.95rem, 1.2vw, 1.1rem);
    letter-spacing: 0.03em;
    line-height: 1.75;
    color: var(--text-primary);
    opacity: 0;
    transition: opacity var(--transition-slow);
}

.body-text.visible {
    opacity: 1;
}

.body-text:nth-child(2) {
    transition-delay: 300ms;
}

/* Panel 5: Kanji Wa */
.panel-kanji-wa {
    background-color: var(--bg-deep);
}

/* Panel 6: Closing */
.panel-closing {
    background-color: var(--bg-primary);
}

.closing-title {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: clamp(2rem, 5vw, 5rem);
    letter-spacing: 0.12em;
    line-height: 1.1;
    color: var(--text-primary);
    opacity: 0;
    transition: opacity var(--transition-slow);
}

.closing-title.visible {
    opacity: 1;
}

.mon-emblem-closing {
    margin-top: 20px;
}

.closing-line {
    width: 61.8vw;
    height: 0.5px;
    background-color: var(--accent-warm);
    opacity: 0.3;
    margin-top: 40px;
}

/* Scroll arrows */
.scroll-arrow {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    z-index: 100;
    opacity: 0;
    pointer-events: none;
    transition: opacity 400ms ease-out;
    cursor: pointer;
    padding: 20px;
}

.scroll-arrow.active {
    pointer-events: auto;
}

.scroll-arrow-left {
    left: 20px;
}

.scroll-arrow-right {
    right: 20px;
}

.scroll-arrow.active:hover {
    opacity: 0.6;
}

/* === Colophon Section (Act III) === */
.colophon-section {
    position: relative;
    width: 100%;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--ground);
    overflow: hidden;
}

.colophon-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
    text-align: center;
}

.colophon-line {
    width: 61.8vw;
    height: 0.5px;
    background-color: var(--accent-warm);
    opacity: 0.2;
    margin-bottom: 20px;
}

.colophon-text {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: clamp(1.2rem, 2.5vw, 2rem);
    letter-spacing: 0.12em;
    line-height: 1.1;
    color: var(--bg-deep);
    opacity: 0;
    transition: opacity var(--transition-slow);
}

.colophon-text.visible {
    opacity: 0.8;
}

.colophon-era {
    font-family: var(--font-kanji);
    font-weight: 200;
    font-size: clamp(3rem, 8vw, 8rem);
    line-height: 1;
    color: var(--bg-primary);
    opacity: 0;
    transition: opacity var(--transition-slow);
    transition-delay: 300ms;
}

.colophon-era.visible {
    opacity: 0.15;
}

.colophon-sub {
    font-family: var(--font-body);
    font-weight: 300;
    font-size: clamp(0.85rem, 1vw, 1rem);
    letter-spacing: 0.03em;
    line-height: 1.75;
    color: var(--accent-cool);
    opacity: 0;
    transition: opacity var(--transition-slow);
    transition-delay: 600ms;
}

.colophon-sub.visible {
    opacity: 0.6;
}

.datestamp-colophon {
    position: absolute;
    right: 40px;
    bottom: 40px;
    color: var(--bg-deep);
    opacity: 0.1;
}

/* === Responsive === */
@media (max-width: 768px) {
    .hero-section {
        min-height: 100vh;
    }

    .datestamp-hero {
        right: 20px;
        bottom: 80px;
    }

    .panel-text {
        padding-left: 8vw;
        padding-right: 8vw;
    }

    .panel-text-content {
        padding-top: 15vh;
    }

    .kanji-large {
        font-size: 40vh;
    }

    .scroll-arrow-left {
        left: 10px;
    }

    .scroll-arrow-right {
        right: 10px;
    }
}