/* ============================================
   rational.business — Maximalist Sepia Chronicle
   ============================================ */

/* --- CSS Custom Properties (Palette) --- */
:root {
    --sepia-dark: #2A1C08;
    --sepia-warm: #5A4428;
    --sepia-gold: #A08860;
    --archive-cream: #F8F0E0;
    --event-card: #FFFBF2;
    --chapter-border: #D8C8A8;
    --book-brown: #8A7048;
    --photo-sepia: rgba(160, 136, 96, 0.07);
    --motif-drift: 0px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background: var(--archive-cream);
    color: var(--sepia-warm);
    font-family: 'Source Serif 4', 'Georgia', serif;
    font-size: clamp(0.9rem, 1.1vw, 1.05rem);
    line-height: 1.85;
    overflow-x: hidden;
}

/* --- Typography --- */
h1, h2, h3 {
    font-family: 'Archivo Black', 'Impact', sans-serif;
    font-weight: 400;
    color: var(--sepia-dark);
}

/* --- Film Grain Texture Overlay --- */
.hero-grain,
.chronicle-grain {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    background-repeat: repeat;
    z-index: 1;
}

/* --- Hero Section --- */
#hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    background: var(--archive-cream);
    overflow: hidden;
}

#hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse at 20% 30%, var(--photo-sepia) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 70%, var(--photo-sepia) 0%, transparent 60%);
    pointer-events: none;
}

/* Aged paper edge vignette */
#hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse at center, transparent 60%, rgba(160, 136, 96, 0.06) 100%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 2rem;
}

.hero-chapter-marker {
    margin-bottom: 2rem;
    opacity: 0;
    animation: fadeInDown 1s ease 0.3s forwards;
}

.book-icon {
    opacity: 0.6;
}

.hero-title {
    font-size: clamp(2rem, 4.5vw, 3.2rem);
    color: var(--sepia-dark);
    letter-spacing: 0.15em;
    margin-bottom: 0.5rem;
    opacity: 0;
    animation: fadeInUp 1s ease 0.6s forwards;
}

.hero-subtitle {
    font-family: 'Source Serif 4', 'Georgia', serif;
    font-weight: 300;
    font-size: clamp(1rem, 1.8vw, 1.3rem);
    color: var(--sepia-gold);
    letter-spacing: 0.08em;
    margin-bottom: 2rem;
    opacity: 0;
    animation: fadeInUp 1s ease 0.9s forwards;
}

.hero-ornament {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    opacity: 0;
    animation: fadeIn 1s ease 1.2s forwards;
    margin-bottom: 2.5rem;
}

.ornament-line {
    display: block;
    width: 60px;
    height: 1px;
    background: var(--sepia-gold);
}

.ornament-diamond {
    display: block;
    width: 8px;
    height: 8px;
    background: var(--sepia-gold);
    transform: rotate(45deg);
}

.hero-epigraph {
    font-family: 'Source Serif 4', 'Georgia', serif;
    font-weight: 300;
    font-style: italic;
    font-size: clamp(0.85rem, 1.2vw, 1rem);
    color: var(--book-brown);
    max-width: 480px;
    margin: 0 auto;
    line-height: 1.8;
    opacity: 0;
    animation: fadeIn 1.2s ease 1.6s forwards;
}

/* Marginalia — scholarly page annotations */
.hero-marginalia {
    position: absolute;
    z-index: 2;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0;
    animation: fadeIn 1.5s ease 2s forwards;
}

.hero-marginalia-left {
    left: 3%;
}

.hero-marginalia-right {
    right: 3%;
}

.marginalia-text {
    font-family: 'Source Serif 4', 'Georgia', serif;
    font-weight: 300;
    font-size: 0.7rem;
    color: var(--book-brown);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    opacity: 0.4;
}

/* Timeline line in hero that draws downward */
.timeline-line-hero {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 0;
    background: var(--sepia-gold);
    animation: drawLineDown 1.5s ease 1.5s forwards;
}

/* --- Chronicle / Timeline Section --- */
#chronicle {
    position: relative;
    padding: 0 2rem 6rem;
    background: var(--archive-cream);
}

.timeline-container {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
}

.timeline-line {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: var(--sepia-gold);
}

/* --- Timeline Event --- */
.timeline-event {
    position: relative;
    width: 50%;
    padding: 2rem 0;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.timeline-event.visible {
    opacity: 1;
    transform: translateY(0);
}

.timeline-event.left {
    padding-right: 50px;
    text-align: right;
}

.timeline-event.right {
    left: 50%;
    padding-left: 50px;
    text-align: left;
}

/* --- Timeline Dot --- */
.timeline-dot {
    position: absolute;
    top: 2.8rem;
    width: 12px;
    height: 12px;
    background: var(--sepia-gold);
    border-radius: 50%;
    border: 2px solid var(--archive-cream);
    box-shadow: 0 0 0 2px var(--sepia-gold);
    z-index: 3;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.dot-ring {
    position: absolute;
    top: -6px;
    left: -6px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 1px solid var(--sepia-gold);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.timeline-event:hover .dot-ring {
    opacity: 0.3;
}

.timeline-event.left .timeline-dot {
    right: -6px;
}

.timeline-event.right .timeline-dot {
    left: -6px;
}

.timeline-event:hover .timeline-dot {
    transform: scale(1.4);
    box-shadow: 0 0 0 3px var(--sepia-gold), 0 0 12px rgba(160, 136, 96, 0.3);
}

/* --- Timeline Date --- */
.timeline-date {
    display: flex;
    flex-direction: column;
    margin-bottom: 0.8rem;
}

.timeline-event.left .timeline-date {
    align-items: flex-end;
}

.timeline-event.right .timeline-date {
    align-items: flex-start;
}

.chapter-num {
    font-family: 'Source Serif 4', 'Georgia', serif;
    font-weight: 300;
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--book-brown);
}

.date-text {
    font-family: 'Space Mono', monospace;
    font-weight: 400;
    font-size: 1.1rem;
    color: var(--sepia-gold);
    letter-spacing: 0.05em;
}

/* --- Event Card --- */
.event-card {
    position: relative;
    max-width: 440px;
    background: var(--event-card);
    border: 1px solid var(--chapter-border);
    border-radius: 4px;
    padding: 24px;
    display: inline-block;
    text-align: left;
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.timeline-event.left .event-card {
    float: right;
}

.timeline-event.right .event-card {
    float: left;
}

.event-card:hover {
    box-shadow: 0 4px 20px rgba(42, 28, 8, 0.08);
    transform: translateY(-2px);
}

.card-chapter-marker {
    position: absolute;
    top: -1px;
    right: 16px;
}

.timeline-event.right .card-chapter-marker {
    right: auto;
    left: 16px;
}

.event-title {
    font-size: clamp(1.2rem, 2vw, 1.5rem);
    margin-bottom: 0.8rem;
    line-height: 1.3;
}

/* --- Duotone Photo --- */
.event-photo {
    position: relative;
    width: 100%;
    height: 160px;
    margin-bottom: 1rem;
    border-radius: 3px;
    overflow: hidden;
    background: var(--chapter-border);
}

.event-photo.duotone {
    filter: sepia(0.7) contrast(1.05);
}

.photo-inner {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--chapter-border) 0%, var(--sepia-gold) 50%, var(--chapter-border) 100%);
    position: relative;
}

/* Abstract archival patterns for each photo */
#photo1 {
    background:
        repeating-linear-gradient(0deg, transparent, transparent 8px, rgba(42, 28, 8, 0.04) 8px, rgba(42, 28, 8, 0.04) 9px),
        linear-gradient(135deg, var(--chapter-border) 0%, var(--sepia-gold) 100%);
}

#photo2 {
    background:
        radial-gradient(circle at 30% 50%, rgba(42, 28, 8, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 70% 50%, rgba(42, 28, 8, 0.06) 0%, transparent 40%),
        linear-gradient(180deg, var(--chapter-border) 0%, var(--sepia-gold) 100%);
}

#photo3 {
    background:
        repeating-linear-gradient(90deg, transparent, transparent 20px, rgba(42, 28, 8, 0.03) 20px, rgba(42, 28, 8, 0.03) 21px),
        repeating-linear-gradient(0deg, transparent, transparent 12px, rgba(42, 28, 8, 0.03) 12px, rgba(42, 28, 8, 0.03) 13px),
        linear-gradient(135deg, var(--sepia-gold) 0%, var(--chapter-border) 100%);
}

#photo4 {
    background:
        radial-gradient(ellipse at center, rgba(42, 28, 8, 0.06) 0%, transparent 70%),
        linear-gradient(45deg, var(--chapter-border) 0%, var(--sepia-gold) 50%, var(--chapter-border) 100%);
}

#photo5 {
    background:
        repeating-linear-gradient(45deg, transparent, transparent 15px, rgba(42, 28, 8, 0.03) 15px, rgba(42, 28, 8, 0.03) 16px),
        linear-gradient(225deg, var(--chapter-border) 0%, var(--sepia-gold) 100%);
}

#photo6 {
    background:
        radial-gradient(circle at 50% 0%, rgba(42, 28, 8, 0.1) 0%, transparent 50%),
        linear-gradient(180deg, var(--sepia-gold) 0%, var(--chapter-border) 100%);
}

#photo7 {
    background:
        repeating-linear-gradient(0deg, transparent, transparent 6px, rgba(42, 28, 8, 0.02) 6px, rgba(42, 28, 8, 0.02) 7px),
        repeating-linear-gradient(90deg, transparent, transparent 6px, rgba(42, 28, 8, 0.02) 6px, rgba(42, 28, 8, 0.02) 7px),
        linear-gradient(135deg, var(--chapter-border) 0%, var(--sepia-gold) 50%, var(--chapter-border) 100%);
}

/* Photo overlay for archival quality */
.event-photo::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--photo-sepia);
    pointer-events: none;
}

/* Photo caption — archival figure reference */
.photo-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 4px 8px;
    font-family: 'Source Serif 4', 'Georgia', serif;
    font-weight: 300;
    font-style: italic;
    font-size: 0.65rem;
    color: var(--book-brown);
    background: rgba(255, 251, 242, 0.75);
    z-index: 2;
    letter-spacing: 0.02em;
}

.event-text {
    margin-bottom: 0.8rem;
    color: var(--sepia-warm);
}

.event-text:last-of-type {
    margin-bottom: 0.6rem;
}

/* Card footnotes — scholarly annotations */
.card-footnote {
    display: flex;
    align-items: baseline;
    gap: 4px;
    padding-top: 0.5rem;
    border-top: 1px solid rgba(208, 200, 168, 0.4);
    margin-top: 0.3rem;
}

.footnote-marker {
    font-family: 'Source Serif 4', 'Georgia', serif;
    font-weight: 400;
    font-size: 0.7rem;
    color: var(--book-brown);
    flex-shrink: 0;
}

.footnote-text {
    font-family: 'Source Serif 4', 'Georgia', serif;
    font-weight: 300;
    font-style: italic;
    font-size: 0.72rem;
    color: var(--book-brown);
    line-height: 1.5;
}

/* --- Colophon / Footer --- */
#colophon {
    position: relative;
    padding: 4rem 2rem;
    background: var(--archive-cream);
    text-align: center;
    border-top: 1px solid var(--chapter-border);
}

.colophon-content {
    max-width: 600px;
    margin: 0 auto;
}

.colophon-ornament {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 1.5rem;
}

.colophon-text {
    font-family: 'Source Serif 4', 'Georgia', serif;
    font-weight: 300;
    font-size: 0.95rem;
    color: var(--sepia-gold);
    letter-spacing: 0.08em;
    margin-bottom: 0.5rem;
}

.colophon-date {
    font-family: 'Space Mono', monospace;
    font-weight: 400;
    font-size: 0.85rem;
    color: var(--book-brown);
    letter-spacing: 0.15em;
    margin-bottom: 2rem;
}

/* Colophon index of chapters */
.colophon-index {
    text-align: left;
    max-width: 340px;
    margin: 0 auto 2rem;
    padding: 1.2rem 1.5rem;
    border: 1px solid var(--chapter-border);
    border-radius: 4px;
    background: var(--event-card);
}

.index-label {
    display: block;
    font-family: 'Archivo Black', 'Impact', sans-serif;
    font-weight: 400;
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--sepia-dark);
    margin-bottom: 0.8rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--chapter-border);
}

.index-list {
    list-style: none;
}

.index-list li {
    font-family: 'Source Serif 4', 'Georgia', serif;
    font-weight: 300;
    font-size: 0.78rem;
    color: var(--sepia-warm);
    line-height: 1.9;
    padding-left: 0;
}

.index-num {
    font-family: 'Space Mono', monospace;
    font-weight: 400;
    font-size: 0.72rem;
    color: var(--sepia-gold);
    margin-right: 6px;
    display: inline-block;
    min-width: 26px;
}

.colophon-scholarly {
    opacity: 0.4;
    margin-bottom: 1rem;
}

.colophon-finis {
    font-family: 'Archivo Black', 'Impact', sans-serif;
    font-weight: 400;
    font-size: 0.7rem;
    letter-spacing: 0.3em;
    color: var(--chapter-border);
}

/* --- Shake Error Overlay --- */
.shake-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(42, 28, 8, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.shake-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.shake-message {
    background: var(--event-card);
    border: 1px solid var(--chapter-border);
    border-radius: 4px;
    padding: 24px 40px;
    font-family: 'Source Serif 4', 'Georgia', serif;
    font-weight: 300;
    color: var(--sepia-warm);
    font-size: 1rem;
    text-align: center;
    max-width: 400px;
}

.shake-message.shaking {
    animation: historicalShake 0.5s ease-in-out;
}

.shake-icon {
    margin-bottom: 12px;
    opacity: 0.5;
}

.shake-dismiss {
    display: inline-block;
    margin-top: 12px;
    font-family: 'Space Mono', monospace;
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--book-brown);
    cursor: pointer;
    opacity: 0.6;
    transition: opacity 0.2s ease;
}

.shake-dismiss:hover {
    opacity: 1;
}

/* --- Shake-Error Scholarly Disagreement Animation --- */
@keyframes historicalShake {
    0%, 100% { transform: translateX(0); }
    10% { transform: translateX(-4px); }
    30% { transform: translateX(4px); }
    50% { transform: translateX(-4px); }
    70% { transform: translateX(4px); }
    90% { transform: translateX(-2px); }
}

/* --- Fade-In Animations --- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes drawLineDown {
    from { height: 0; }
    to { height: 120px; }
}

/* --- Book-Scholarly Background Motifs --- */
#chronicle::before {
    content: '';
    position: absolute;
    top: calc(10% + var(--motif-drift));
    left: 5%;
    width: 80px;
    height: 100px;
    border: 1px solid var(--book-brown);
    border-radius: 2px;
    opacity: 0.07;
    transform: rotate(-5deg);
    pointer-events: none;
    transition: top 0.1s linear;
}

#chronicle::after {
    content: '';
    position: absolute;
    top: calc(40% + var(--motif-drift) * -0.7);
    right: 5%;
    width: 60px;
    height: 80px;
    border: 1px solid var(--book-brown);
    border-radius: 2px;
    opacity: 0.07;
    transform: rotate(3deg);
    pointer-events: none;
    transition: top 0.1s linear;
}

/* --- Scholarly Page Margin Lines --- */
.timeline-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 10%;
    width: 1px;
    height: 100%;
    background: repeating-linear-gradient(
        to bottom,
        transparent,
        transparent 4px,
        rgba(138, 112, 72, 0.06) 4px,
        rgba(138, 112, 72, 0.06) 8px
    );
    pointer-events: none;
}

.timeline-container::after {
    content: '';
    position: absolute;
    top: 0;
    right: 10%;
    width: 1px;
    height: 100%;
    background: repeating-linear-gradient(
        to bottom,
        transparent,
        transparent 4px,
        rgba(138, 112, 72, 0.06) 4px,
        rgba(138, 112, 72, 0.06) 8px
    );
    pointer-events: none;
}

/* --- Responsive: Mobile Timeline --- */
@media (max-width: 768px) {
    .timeline-line {
        left: 20px;
    }

    .timeline-event {
        width: 100%;
        padding-left: 50px;
        padding-right: 0;
        text-align: left;
    }

    .timeline-event.left {
        padding-right: 0;
        padding-left: 50px;
        text-align: left;
    }

    .timeline-event.right {
        left: 0;
        padding-left: 50px;
    }

    .timeline-event.left .timeline-dot,
    .timeline-event.right .timeline-dot {
        left: 14px;
        right: auto;
    }

    .timeline-event.left .timeline-date,
    .timeline-event.right .timeline-date {
        align-items: flex-start;
    }

    .timeline-event.left .event-card,
    .timeline-event.right .event-card {
        float: none;
        max-width: 100%;
    }

    .timeline-event.right .card-chapter-marker {
        left: auto;
        right: 16px;
    }

    .timeline-line-hero {
        left: 20px;
    }

    .timeline-container::before,
    .timeline-container::after {
        display: none;
    }

    #chronicle::before,
    #chronicle::after {
        display: none;
    }

    .hero-marginalia {
        display: none;
    }

    .colophon-index {
        max-width: 100%;
    }
}

/* --- Selection Color --- */
::selection {
    background: rgba(160, 136, 96, 0.25);
    color: var(--sepia-dark);
}

/* --- Scrollbar (Webkit) --- */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--archive-cream);
}

::-webkit-scrollbar-thumb {
    background: var(--chapter-border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--sepia-gold);
}