/* heisei.day - Sepia-Toned Historical Timeline */

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

:root {
    --aged-parchment: #F5E6D0;
    --event-card: #FAF3E8;
    --ink-sepia: #4A3728;
    --timeline-bronze: #8B7355;
    --faded-gold: #C9A96E;
    --dust-rose: #C4A08A;
    --shadow-sepia: #D4C4A8;
    --fog-white: #FFF8F0;
}

body {
    font-family: 'EB Garamond', serif;
    font-weight: 400;
    font-size: 1rem;
    line-height: 1.8;
    color: var(--ink-sepia);
    background-color: var(--aged-parchment);
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
    overflow-x: hidden;
    box-shadow: inset 0 0 100px 40px rgba(245, 230, 208, 0.8);
}

/* Era Plaque (Hero) */
#era-plaque {
    width: 100%;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.plaque-content {
    text-align: center;
    position: relative;
}

.hanko-seal {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: #C62828;
    opacity: 0;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: rotate(-15deg);
    transition: opacity 0.4s ease;
}

.hanko-seal.visible {
    opacity: 0.6;
}

.hanko-char {
    font-family: 'Shippori Mincho', serif;
    font-weight: 600;
    font-size: 1.2rem;
    color: #FFFFFF;
    line-height: 1;
}

.era-name {
    font-family: 'Shippori Mincho', serif;
    font-weight: 600;
    font-size: clamp(3rem, 6vw, 5rem);
    letter-spacing: 0.08em;
    color: var(--ink-sepia);
    clip-path: inset(50% 50% 50% 50%);
    transition: clip-path 0.8s ease;
}

.era-name.revealed {
    clip-path: inset(0% 0% 0% 0%);
}

.era-dates {
    font-family: 'Cormorant Garamond', serif;
    font-weight: 300;
    font-size: 1.2rem;
    letter-spacing: 0.1em;
    color: var(--timeline-bronze);
    margin-top: 0.5rem;
    opacity: 0;
    transition: opacity 0.6s ease;
}

.era-dates.visible {
    opacity: 1;
}

/* Timeline Container */
#timeline-container {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1rem 4rem;
}

.timeline-trunk {
    position: absolute;
    left: 50%;
    top: 0;
    width: 2px;
    height: 0;
    background: var(--timeline-bronze);
    transform: translateX(-50%);
    transition: height 0.1s linear;
}

/* Decade Markers */
.decade-marker {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 60px 0;
    z-index: 2;
}

.decade-circle {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: 2px solid var(--timeline-bronze);
    background: var(--aged-parchment);
    position: relative;
    z-index: 2;
    opacity: 0;
    transition: opacity 0.4s ease, transform 0.5s ease, box-shadow 0.3s ease;
}

.decade-circle.visible {
    opacity: 1;
    animation: decade-pulse 0.5s ease;
}

@keyframes decade-pulse {
    0% { transform: scale(1); box-shadow: 0 0 0 rgba(201,169,110,0); }
    50% { transform: scale(1.3); box-shadow: 0 0 12px rgba(201,169,110,0.5); }
    100% { transform: scale(1); box-shadow: 0 0 0 rgba(201,169,110,0); }
}

.decade-year {
    font-family: 'Cormorant Garamond', serif;
    font-weight: 600;
    font-size: 1.4rem;
    color: var(--faded-gold);
    position: absolute;
    left: calc(50% + 20px);
    opacity: 0;
    transition: opacity 0.4s ease 0.2s;
    letter-spacing: 0.1em;
}

.decade-year.visible {
    opacity: 1;
}

/* Event Cards */
.event-card {
    position: relative;
    width: calc(50% - 60px);
    margin-bottom: 120px;
    opacity: 0;
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.event-card.left {
    margin-left: 0;
    margin-right: auto;
    transform: translateX(-30px);
    text-align: right;
}

.event-card.right {
    margin-left: auto;
    margin-right: 0;
    transform: translateX(30px);
    text-align: left;
}

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

.card-body {
    background: var(--event-card);
    border: 1px solid var(--shadow-sepia);
    box-shadow: 2px 2px 8px rgba(139, 115, 85, 0.15);
    padding: 24px;
    max-width: 400px;
    position: relative;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    background-image: linear-gradient(135deg, rgba(201, 169, 110, 0.05) 0%, transparent 100%);
}

.event-card.left .card-body {
    margin-left: auto;
}

.event-card.right .card-body {
    margin-right: auto;
}

.card-body:hover {
    transform: translateY(-2px);
    box-shadow: 3px 3px 12px rgba(139, 115, 85, 0.25);
}

/* Connector lines */
.connector {
    position: absolute;
    top: 30px;
    width: 40px;
    height: 1px;
    background: var(--timeline-bronze);
    opacity: 0;
    transition: opacity 0.2s ease;
}

.event-card.left .connector {
    right: -60px;
}

.event-card.right .connector {
    left: -60px;
}

.connector::after {
    content: '';
    position: absolute;
    top: -3px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--timeline-bronze);
}

.event-card.left .connector::after {
    right: -4px;
}

.event-card.right .connector::after {
    left: -4px;
}

.event-card.visible .connector {
    opacity: 1;
}

.event-year {
    font-family: 'Cormorant Garamond', serif;
    font-weight: 300;
    font-size: 1.2rem;
    letter-spacing: 0.1em;
    color: var(--dust-rose);
    display: block;
    margin-bottom: 0.3rem;
}

.event-title {
    font-family: 'Cormorant Garamond', serif;
    font-weight: 600;
    font-size: clamp(1.1rem, 1.8vw, 1.4rem);
    color: var(--ink-sepia);
    margin-bottom: 0.5rem;
}

.card-body p {
    color: var(--ink-sepia);
    font-size: 0.95rem;
    line-height: 1.8;
}

/* Epilogue */
#epilogue {
    padding: 4rem 2rem 6rem;
    text-align: center;
    position: relative;
}

.epilogue-line {
    width: 0;
    height: 1px;
    background: var(--timeline-bronze);
    margin: 0 auto 2rem;
    transition: width 0.4s ease;
}

.epilogue-line.expanded {
    width: 100%;
}

.epilogue-text {
    font-family: 'Shippori Mincho', serif;
    font-weight: 400;
    font-size: 1.4rem;
    color: var(--dust-rose);
    opacity: 0;
    transition: opacity 0.6s ease;
    letter-spacing: 0.15em;
}

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

/* Responsive */
@media (max-width: 768px) {
    #timeline-container {
        padding-left: 2rem;
    }

    .timeline-trunk {
        left: 20px;
    }

    .event-card.left,
    .event-card.right {
        width: calc(100% - 60px);
        margin-left: 50px;
        margin-right: 0;
        text-align: left;
        transform: translateX(20px);
    }

    .event-card.left .card-body,
    .event-card.right .card-body {
        margin-left: 0;
        margin-right: 0;
    }

    .event-card.left .connector,
    .event-card.right .connector {
        left: -40px;
        right: auto;
    }

    .event-card.left .connector::after,
    .event-card.right .connector::after {
        left: -4px;
        right: auto;
    }

    .decade-marker {
        justify-content: flex-start;
        padding-left: 12px;
    }

    .decade-year {
        left: 30px;
    }
}