/* ================================================================
   historygrapher.com — A cartographic index of time.
   Aesthetic: isometric technical drafting × Swiss typographic rigor
   ================================================================ */

:root {
    --blueprint-dark: #0a1628;
    --blueprint-darker: #07101e;
    --grid-line-major: #1a2a3a;
    --grid-line-minor: #0f1a28;
    --accent-cyan: #00b4d8;
    --accent-amber: #f4a261;
    --accent-coral: #e76f51;
    --accent-lavender: #8a7eb8;
    --text-primary: #e8f0f8;
    --text-secondary: #6a7a8e;

    --font-display: 'Space Grotesk', 'Inter', system-ui, sans-serif;
    --font-body: 'Inter', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', 'Menlo', monospace;

    --grid-major: 60px;
    --grid-minor: 12px;
    --header-h: 48px;
    --hex-w: 280px;
}

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

html, body {
    background: var(--blueprint-dark);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    cursor: none;
}

html { scroll-behavior: smooth; }

body { overflow-x: hidden; min-height: 100vh; position: relative; }

/* ----------------------------------------------------------------
   Blueprint grid background — fixed, two-tier
   ---------------------------------------------------------------- */
.blueprint-bg {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background-color: var(--blueprint-dark);
    background-image:
        repeating-linear-gradient(0deg,
            transparent 0,
            transparent calc(var(--grid-minor) - 1px),
            var(--grid-line-minor) calc(var(--grid-minor) - 1px),
            var(--grid-line-minor) var(--grid-minor)),
        repeating-linear-gradient(90deg,
            transparent 0,
            transparent calc(var(--grid-minor) - 1px),
            var(--grid-line-minor) calc(var(--grid-minor) - 1px),
            var(--grid-line-minor) var(--grid-minor)),
        repeating-linear-gradient(0deg,
            transparent 0,
            transparent calc(var(--grid-major) - 1px),
            var(--grid-line-major) calc(var(--grid-major) - 1px),
            var(--grid-line-major) var(--grid-major)),
        repeating-linear-gradient(90deg,
            transparent 0,
            transparent calc(var(--grid-major) - 1px),
            var(--grid-line-major) calc(var(--grid-major) - 1px),
            var(--grid-line-major) var(--grid-major));
    background-attachment: fixed;
}

.blueprint-bg::after {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 10%, rgba(0,180,216,0.05), transparent 60%),
        radial-gradient(ellipse at 80% 90%, rgba(138,126,184,0.05), transparent 60%);
    pointer-events: none;
}

/* ----------------------------------------------------------------
   Coordinate overlays
   ---------------------------------------------------------------- */
.coord-overlay {
    position: fixed;
    z-index: 1;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.15em;
    color: var(--text-primary);
    opacity: 0.3;
    pointer-events: none;
    text-transform: lowercase;
    white-space: nowrap;
    user-select: none;
}
.coord-overlay::before {
    content: "+ ";
    color: var(--accent-cyan);
    opacity: 0.7;
}

/* ----------------------------------------------------------------
   Header
   ---------------------------------------------------------------- */
.site-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--header-h);
    z-index: 50;
    background: rgba(10, 22, 40, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--grid-line-major);
}

.header-inner {
    display: flex;
    align-items: center;
    height: 100%;
    padding: 0 32px;
    gap: 24px;
}

.wordmark {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.875rem;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: var(--text-primary);
}

.header-rule {
    flex: 1;
    height: 1px;
    background: var(--grid-line-major);
}

.header-coord {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    color: var(--text-secondary);
    white-space: nowrap;
}

.explore-link {
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    color: var(--accent-cyan);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.25s ease, color 0.25s ease;
}
.explore-link:hover { border-bottom-color: var(--accent-cyan); }

/* ----------------------------------------------------------------
   Main wrapper
   ---------------------------------------------------------------- */
main {
    position: relative;
    z-index: 2;
    padding-top: var(--header-h);
}

/* ----------------------------------------------------------------
   Map table (intro section)
   ---------------------------------------------------------------- */
.map-table {
    position: relative;
    padding: 96px 60px 80px;
    max-width: 1440px;
    margin: 0 auto;
    border-bottom: 1px solid var(--grid-line-major);
}

.map-meta {
    display: flex;
    gap: 48px;
    margin-bottom: 48px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.18em;
    color: var(--text-secondary);
    text-transform: uppercase;
}
.map-meta .meta-line { position: relative; padding-left: 18px; }
.map-meta .meta-line::before {
    content: "";
    position: absolute;
    left: 0; top: 50%;
    width: 12px; height: 1px;
    background: var(--accent-cyan);
}

.display-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2.5rem, 6vw, 5.5rem);
    line-height: 1.02;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: 32px;
    max-width: 16ch;
}
.display-title em {
    font-style: italic;
    color: var(--accent-cyan);
    font-weight: 500;
}

.display-sub {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    line-height: 1.6;
    color: var(--text-secondary);
    max-width: 60ch;
    margin-bottom: 56px;
}

.display-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 28px;
    align-items: center;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--text-secondary);
}
.legend-dot {
    display: inline-block;
    width: 8px; height: 8px;
    background: var(--c, var(--accent-cyan));
    margin-right: 8px;
    box-shadow: 0 0 8px var(--c, var(--accent-cyan));
    vertical-align: middle;
}
.legend-label { display: inline-block; vertical-align: middle; margin-right: 8px; }

/* ----------------------------------------------------------------
   Section header (used in §02, §03, §04)
   ---------------------------------------------------------------- */
.section-header {
    display: flex;
    align-items: baseline;
    gap: 24px;
    padding: 0 60px;
    max-width: 1440px;
    margin: 0 auto 48px;
}
.section-num {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    color: var(--accent-cyan);
}
.section-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-primary);
}
.section-rule {
    flex: 1;
    height: 1px;
    background: linear-gradient(to right, var(--grid-line-major), transparent);
    align-self: center;
}
.section-meta {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.18em;
    color: var(--text-secondary);
    text-transform: uppercase;
    white-space: nowrap;
}

/* ----------------------------------------------------------------
   Honeycomb section
   ---------------------------------------------------------------- */
.honeycomb-section {
    padding: 80px 0 96px;
    border-bottom: 1px solid var(--grid-line-major);
}

.honeycomb {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: calc(var(--hex-w) * -0.21);
    padding: 0 32px;
}

.hex-row {
    display: flex;
    gap: 16px;
}
.hex-row-b {
    margin-left: 0;
    transform: translateX(0);
}

.hex {
    width: var(--hex-w);
    height: calc(var(--hex-w) * 1.1547);
    clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
    background: linear-gradient(180deg, rgba(26,42,58,0.85), rgba(10,22,40,0.95));
    position: relative;
    transition: transform 0.3s ease-out, filter 0.3s ease-out;
    cursor: none;
}
.hex::before {
    content: "";
    position: absolute;
    inset: 2px;
    clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
    background: var(--blueprint-dark);
    z-index: 0;
}
.hex::after {
    content: "";
    position: absolute;
    inset: 0;
    clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
    background:
        repeating-linear-gradient(0deg, transparent 0, transparent 3px, rgba(232,240,248,0.06) 3px, rgba(232,240,248,0.06) 4px),
        repeating-linear-gradient(90deg, transparent 0, transparent 3px, rgba(232,240,248,0.06) 3px, rgba(232,240,248,0.06) 4px);
    opacity: 0;
    transition: opacity 0.35s ease;
    z-index: 2;
    pointer-events: none;
}
.hex:hover {
    transform: scale(1.05);
    filter: drop-shadow(0 0 14px var(--c));
}
.hex:hover::after { opacity: 1; }

.hex-inner {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 14px;
    padding: 32px 24px;
    text-align: center;
    z-index: 1;
}
.hex-icon {
    width: 56px;
    height: 56px;
    color: var(--c);
    transition: transform 0.4s ease;
}
.hex:hover .hex-icon { transform: rotate(15deg) scale(1.06); }

.hex-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--text-primary);
}
.hex-count {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.18em;
    color: var(--text-secondary);
}

/* ----------------------------------------------------------------
   Timeline section
   ---------------------------------------------------------------- */
.timeline-section {
    padding: 80px 0 96px;
    border-bottom: 1px solid var(--grid-line-major);
}

.timeline {
    position: relative;
    max-width: 1100px;
    margin: 0 auto;
    padding: 40px 60px;
}
.timeline-axis {
    position: absolute;
    left: 50%;
    top: 0; bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom,
        transparent 0%,
        var(--grid-line-major) 6%,
        var(--grid-line-major) 94%,
        transparent 100%);
    transform: translateX(-1px);
}
.timeline-axis::before,
.timeline-axis::after {
    content: "";
    position: absolute;
    left: 50%;
    width: 12px; height: 12px;
    border: 1px solid var(--accent-cyan);
    border-radius: 50%;
    transform: translateX(-50%);
}
.timeline-axis::before { top: -6px; }
.timeline-axis::after { bottom: -6px; }

.t-node {
    position: relative;
    width: 50%;
    margin: 56px 0;
    display: flex;
    align-items: center;
}
.t-node.t-left {
    margin-right: auto;
    justify-content: flex-start;
    padding-right: 100px;
}
.t-node.t-right {
    margin-left: 50%;
    justify-content: flex-start;
    padding-left: 100px;
}

.t-card {
    position: relative;
    background: rgba(10, 22, 40, 0.78);
    border: 1px solid var(--grid-line-major);
    padding: 22px 26px;
    width: 100%;
    max-width: 380px;
    transition: border-color 0.3s ease, transform 0.3s ease;
    z-index: 2;
}
.t-card::before {
    content: "";
    position: absolute;
    top: -1px; left: -1px;
    width: 14px; height: 14px;
    border-top: 2px solid var(--text-primary);
    border-left: 2px solid var(--text-primary);
    opacity: 0.4;
}
.t-card::after {
    content: "";
    position: absolute;
    bottom: -1px; right: -1px;
    width: 14px; height: 14px;
    border-bottom: 2px solid var(--text-primary);
    border-right: 2px solid var(--text-primary);
    opacity: 0.4;
}
.t-node:hover .t-card {
    border-color: var(--c, var(--accent-cyan));
    transform: translateY(-2px);
}

.t-date {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    color: var(--c, var(--accent-cyan));
    margin-bottom: 8px;
}
.t-title {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: 1.0625rem;
    line-height: 1.35;
    color: var(--text-primary);
    margin-bottom: 8px;
    letter-spacing: 0.01em;
}
.t-title em { color: var(--c, var(--accent-cyan)); font-style: italic; }
.t-meta {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    color: var(--text-secondary);
    text-transform: lowercase;
}

.t-connector {
    position: absolute;
    width: 200px;
    height: 100px;
    overflow: visible;
    pointer-events: none;
}
.t-node.t-left .t-connector {
    right: -60px;
    top: 50%;
    transform: translateY(-50%);
}
.t-node.t-right .t-connector {
    left: -60px;
    top: 50%;
    transform: translateY(-50%) scaleX(1);
}
.t-path {
    fill: none;
    stroke: var(--c, var(--accent-cyan));
    stroke-width: 1.6;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-dasharray: 400;
    stroke-dashoffset: 400;
    transition: stroke-dashoffset 0.9s ease-out;
}
.t-dot {
    fill: var(--c, var(--accent-cyan));
    opacity: 0;
    transition: opacity 0.4s ease 0.4s;
}
.t-node.in-view .t-path { stroke-dashoffset: 0; }
.t-node.in-view .t-dot { opacity: 1; }

.t-node[data-color] { --c: attr(data-color color, #00b4d8); }
.t-node[data-color="#00b4d8"] { --c: #00b4d8; }
.t-node[data-color="#f4a261"] { --c: #f4a261; }
.t-node[data-color="#e76f51"] { --c: #e76f51; }
.t-node[data-color="#8a7eb8"] { --c: #8a7eb8; }

/* ----------------------------------------------------------------
   Index strip
   ---------------------------------------------------------------- */
.index-strip {
    padding: 80px 0 96px;
}
.index-list {
    list-style: none;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 60px;
    border-top: 1px solid var(--grid-line-major);
}
.index-list li {
    display: grid;
    grid-template-columns: 80px 1fr 120px 80px;
    align-items: center;
    gap: 24px;
    padding: 16px 0;
    border-bottom: 1px solid var(--grid-line-major);
    transition: background 0.25s ease, padding 0.25s ease;
}
.index-list li:hover {
    background: rgba(0, 180, 216, 0.04);
    padding-left: 12px;
}
.ix-coord {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    color: var(--text-secondary);
}
.ix-label {
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--text-primary);
    font-weight: 400;
}
.ix-label em { font-style: italic; color: var(--accent-cyan); }
.ix-bar {
    height: 2px;
    background: var(--c, var(--accent-cyan));
    box-shadow: 0 0 6px var(--c, var(--accent-cyan));
    width: 100%;
    transform-origin: left center;
    transform: scaleX(0.6);
    transition: transform 0.4s ease;
}
.index-list li:hover .ix-bar { transform: scaleX(1); }
.ix-year {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.12em;
    color: var(--text-primary);
    text-align: right;
}

/* ----------------------------------------------------------------
   Footer
   ---------------------------------------------------------------- */
.site-footer {
    position: relative;
    z-index: 2;
    padding: 64px 60px 48px;
    max-width: 1440px;
    margin: 0 auto;
    border-top: 1px solid var(--grid-line-major);
}
.footer-coords {
    display: flex;
    flex-wrap: wrap;
    gap: 36px 64px;
    margin-bottom: 32px;
}
.coord-block {
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.coord-key {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.25em;
    color: var(--text-secondary);
    text-transform: uppercase;
}
.coord-val {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: 0.15em;
    color: var(--text-primary);
    text-transform: uppercase;
}
.footer-rule {
    height: 1px;
    background: var(--grid-line-major);
    margin: 32px 0 24px;
}
.footer-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    color: var(--text-secondary);
    text-transform: lowercase;
}

/* ----------------------------------------------------------------
   Crosshair cursor
   ---------------------------------------------------------------- */
.crosshair {
    position: fixed;
    top: 0; left: 0;
    width: 20px;
    height: 20px;
    z-index: 9999;
    pointer-events: none;
    transform: translate(-50%, -50%);
    mix-blend-mode: difference;
    transition: transform 0.08s linear;
}
.crosshair svg {
    width: 100%; height: 100%;
    stroke: var(--accent-cyan);
    stroke-width: 1;
    fill: var(--accent-cyan);
    overflow: visible;
}
.crosshair.is-hover svg {
    stroke: var(--accent-amber);
    fill: var(--accent-amber);
}
.crosshair.is-hover {
    transform: translate(-50%, -50%) scale(1.4);
}

/* ----------------------------------------------------------------
   Scroll-reveal helpers
   ---------------------------------------------------------------- */
.t-card,
.hex,
.index-list li {
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.7s ease, transform 0.7s ease, border-color 0.3s ease, background 0.25s ease, padding 0.25s ease;
}
.t-node.in-view .t-card,
.hex.in-view,
.index-list li.in-view {
    opacity: 1;
    transform: translateY(0);
}

/* ----------------------------------------------------------------
   Responsive: collapse honeycomb & timeline below 768px
   ---------------------------------------------------------------- */
@media (max-width: 1024px) {
    :root { --hex-w: 220px; }
    .map-table { padding: 80px 32px 64px; }
    .section-header { padding: 0 32px; }
    .index-list { padding: 0 32px; }
    .site-footer { padding: 48px 32px; }
}

@media (max-width: 768px) {
    html, body { cursor: auto; }
    .crosshair { display: none; }

    .header-rule { display: none; }
    .header-coord { display: none; }
    .header-inner { padding: 0 20px; gap: 12px; justify-content: space-between; }

    .map-table { padding: 64px 20px 48px; }
    .map-meta { flex-direction: column; gap: 12px; margin-bottom: 32px; }

    .display-title { font-size: clamp(2rem, 9vw, 3rem); }
    .display-sub { margin-bottom: 32px; }

    .section-header { flex-wrap: wrap; padding: 0 20px; gap: 12px; }
    .section-rule { display: none; }

    /* Honeycomb collapses to single-column rounded cards */
    .honeycomb { gap: 16px; padding: 0 20px; }
    .hex-row { flex-direction: column; gap: 16px; width: 100%; }
    .hex {
        width: 100%;
        height: auto;
        min-height: 140px;
        clip-path: none;
        border: 1px solid var(--grid-line-major);
        border-radius: 6px;
        background: rgba(10, 22, 40, 0.7);
    }
    .hex::before { display: none; }
    .hex::after { clip-path: none; border-radius: 6px; }
    .hex:hover { transform: translateY(-2px); }
    .hex-inner {
        position: relative;
        flex-direction: row;
        gap: 18px;
        padding: 20px 24px;
        text-align: left;
        justify-content: flex-start;
    }
    .hex-icon { width: 40px; height: 40px; }

    /* Timeline collapses to left-aligned vertical strip */
    .timeline { padding: 32px 20px; }
    .timeline-axis { left: 24px; transform: none; }
    .timeline-axis::before, .timeline-axis::after { left: 0; }
    .t-node, .t-node.t-left, .t-node.t-right {
        width: 100%;
        margin: 32px 0;
        padding: 0 0 0 56px;
        justify-content: flex-start;
    }
    .t-connector { display: none; }
    .t-card::before, .t-card::after { display: none; }
    .t-card {
        max-width: none;
        border-left: 2px solid var(--c, var(--accent-cyan));
    }

    .index-list { padding: 0 20px; }
    .index-list li {
        grid-template-columns: 56px 1fr 60px;
        gap: 12px;
    }
    .ix-bar { display: none; }

    .footer-coords { gap: 24px 36px; }
    .coord-val { font-size: 1rem; }
}

@media (max-width: 420px) {
    .display-title { font-size: 1.85rem; }
    .map-meta { font-size: 0.62rem; }
    .footer-legend { font-size: 0.6rem; }
}