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

:root {
    --bg:          #0d1117;
    --bg-panel:    #161b22;
    --bg-panel2:   #1c2128;
    --border:      #30363d;
    --text-primary:   #e6edf3;
    --text-secondary: #8b949e;
    --text-muted:     #484f58;

    /* Series colours */
    --c-wti:   #f0b429;   /* amber  */
    --c-brent: #58a6ff;   /* blue   */
    --c-wcs:   #f47067;   /* coral  */
    --c-urals: #bc8cff;   /* purple */
    --c-opec:  #3fb950;   /* green  */

    --c-spread-pos: #f47067;   /* red-ish when spread widens (Canada hurts) */
    --c-spread-neg: #3fb950;

    --font: 'Inter', system-ui, -apple-system, sans-serif;
    --radius: 6px;
}

html, body {
    background: var(--bg);
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 13px;
    min-height: 100vh;
}

/* ── Header ──────────────────────────────────────────────────────────────── */
header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px 12px;
    border-bottom: 1px solid var(--border);
}

h1 {
    font-size: 22px;
    font-weight: 600;
    letter-spacing: -0.3px;
    color: var(--text-primary);
}

.subtitle {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 3px;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* ── Toggle group ─────────────────────────────────────────────────────────── */
.toggle-group {
    display: flex;
    background: var(--bg-panel2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.toggle-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 5px 12px;
    cursor: pointer;
    font-size: 12px;
    font-family: var(--font);
    transition: background 0.15s, color 0.15s;
}

.toggle-btn.active {
    background: var(--border);
    color: var(--text-primary);
}

.toggle-btn:hover:not(.active) {
    background: var(--bg-panel);
    color: var(--text-primary);
}

/* ── Play button ──────────────────────────────────────────────────────────── */
#play-btn {
    background: var(--bg-panel2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    padding: 5px 14px;
    cursor: pointer;
    font-size: 12px;
    font-family: var(--font);
    transition: border-color 0.15s, background 0.15s;
}

#play-btn:hover { border-color: var(--c-wti); background: var(--bg-panel); }
#play-btn.playing { border-color: var(--c-wti); color: var(--c-wti); }

/* ── Chapter / story buttons (Gap 1) ─────────────────────────────────────── */
#chapter-row {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 24px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-panel);
}

#chapter-btns {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.chapter-btn {
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-secondary);
    padding: 4px 13px;
    cursor: pointer;
    font-size: 12px;
    font-family: var(--font);
    transition: all 0.15s;
}

.chapter-btn:hover { border-color: #8b949e; color: var(--text-primary); }

.chapter-btn.active {
    background: var(--border);
    color: var(--text-primary);
    border-color: var(--c-wti);
}

/* ── Series toggles ──────────────────────────────────────────────────────── */
#series-toggles {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    border-bottom: 1px solid var(--border);
}

.toggle-label {
    color: var(--text-secondary);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-right: 4px;
}

.series-btn {
    display: flex;
    align-items: center;
    gap: 5px;
    background: var(--bg-panel2);
    border: 1px solid var(--border);
    border-radius: 99px;
    color: var(--text-secondary);
    padding: 3px 11px 3px 8px;
    cursor: pointer;
    font-size: 12px;
    font-family: var(--font);
    transition: all 0.15s;
}

.series-btn .swatch {
    width: 8px; height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
    opacity: 0.4;
    transition: opacity 0.15s;
}

.series-btn.active .swatch { opacity: 1; }
.series-btn.active { color: var(--text-primary); }
.series-btn:hover { border-color: #8b949e; }

/* ── Chart panels ────────────────────────────────────────────────────────── */
#chart-container,
#spread-container,
#context-container {
    padding: 0 24px;
    margin-top: 16px;
}

#spread-container { margin-top: 24px; }
#context-container { margin-top: 16px; }

.toolbar {
    margin-bottom: 20px;
}

.panel-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-secondary);
    padding: 8px 0 2px;
}

.panel-sublabel {
    text-transform: none;
    letter-spacing: 0;
    font-size: 11px;
    color: var(--text-muted);
}

#main-chart, #spread-chart, #context-chart {
    width: 100%;
    display: block;
    overflow: visible;
}

/* ── SVG elements ────────────────────────────────────────────────────────── */
.axis text { fill: var(--text-secondary); font-size: 11px; }
.axis path, .axis line { stroke: var(--border); }
.axis .domain { display: none; }
.grid line { stroke: var(--border); stroke-opacity: 0.5; stroke-dasharray: 2 3; }
.grid .domain { display: none; }

.line { fill: none; stroke-width: 1.5; }
.line.wti   { stroke: var(--c-wti); }
.line.brent { stroke: var(--c-brent); }
.line.wcs   { stroke: var(--c-wcs); }
.line.urals { stroke: var(--c-urals); }
.line.opec_basket { stroke: var(--c-opec); }

.line.hidden { opacity: 0; pointer-events: none; }

.spread-area { opacity: 0.25; }
.spread-line { fill: none; stroke-width: 1.5; stroke: var(--c-spread-pos); }

/* crosshair */
.crosshair { stroke: var(--text-muted); stroke-width: 1; pointer-events: none; }

/* annotation markers */
.ann-marker {
    cursor: pointer;
}
.ann-marker line {
    stroke: var(--text-muted);
    stroke-width: 1;
    stroke-dasharray: 3 3;
}
.ann-marker circle {
    fill: var(--bg-panel);
    stroke: var(--text-secondary);
    stroke-width: 1.2;
    transition: stroke 0.15s, r 0.15s;
}
.ann-marker:hover circle {
    stroke: var(--c-wti);
    r: 5;
}
.ann-marker text {
    fill: var(--text-muted);
    font-size: 10px;
    pointer-events: none;
}

/* context brush */
.brush .selection {
    fill: var(--c-wti);
    fill-opacity: 0.12;
    stroke: var(--c-wti);
    stroke-width: 1;
}
.brush .handle { fill: var(--c-wti); fill-opacity: 0.5; }
.brush .overlay { cursor: crosshair; }

/* ── Tooltip ─────────────────────────────────────────────────────────────── */
.tooltip {
    position: fixed;
    background: var(--bg-panel2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 10px 14px;
    pointer-events: none;
    z-index: 100;
    min-width: 160px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.5);
    transition: opacity 0.1s;
}

.tooltip.hidden { opacity: 0; }

.tooltip-date {
    font-size: 11px;
    color: var(--text-secondary);
    margin-bottom: 6px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 5px;
}

.tooltip-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-top: 4px;
    font-size: 12px;
}

.tooltip-swatch {
    width: 7px; height: 7px;
    border-radius: 50%;
    flex-shrink: 0;
}

.tooltip-name { color: var(--text-secondary); flex: 1; }
.tooltip-val  { color: var(--text-primary); font-variant-numeric: tabular-nums; }

/* ── Event panel ─────────────────────────────────────────────────────────── */
.event-panel {
    position: fixed;
    right: 0; top: 0; bottom: 0;
    width: 300px;
    background: var(--bg-panel);
    border-left: 1px solid var(--border);
    padding: 24px 20px;
    z-index: 200;
    transform: translateX(0);
    transition: transform 0.25s ease;
    overflow-y: auto;
}

.event-panel.hidden {
    transform: translateX(320px);
}

#event-close {
    position: absolute;
    top: 14px; right: 14px;
    background: none; border: none;
    color: var(--text-secondary);
    font-size: 16px; cursor: pointer;
}
#event-close:hover { color: var(--text-primary); }

.event-category {
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 6px;
    font-weight: 600;
}
.event-category.opec         { color: var(--c-opec); }
.event-category.geopolitical { color: var(--c-brent); }
.event-category.market       { color: var(--c-wti); }
.event-category.infrastructure { color: var(--c-wcs); }
.event-category.demand       { color: var(--c-urals); }

.event-date {
    font-size: 11px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.event-panel h3 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
    line-height: 1.35;
}

.event-panel p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ── Footer ──────────────────────────────────────────────────────────────── */
footer {
    padding: 12px 24px;
    font-size: 11px;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
    margin-top: 8px;
}

/* ── Learn more expandable ───────────────────────────────────────────────── */
.learn-more-btn {
    margin-top: 12px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-secondary);
    padding: 4px 12px;
    font-size: 12px;
    font-family: var(--font);
    cursor: pointer;
    transition: border-color 0.15s, color 0.15s;
}
.learn-more-btn:hover {
    border-color: var(--c-wti);
    color: var(--text-primary);
}

.learn-more-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, opacity 0.3s ease;
    opacity: 0;
}
.learn-more-content.open {
    max-height: 800px;
    opacity: 1;
}

.benchmark-entry {
    margin-top: 18px;
    padding-left: 12px;
    border-left: 2px solid var(--border);
}
.benchmark-entry h4 {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 5px;
}
.benchmark-entry p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}
.benchmark-footer {
    margin-top: 18px;
    font-size: 12px;
    color: var(--text-muted);
    font-style: italic;
    line-height: 1.6;
}

/* ── Section nav dots ────────────────────────────────────────────────────── */
#section-nav {
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav-dot {
    width: 32px; height: 32px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--bg-panel2);
    color: var(--text-muted);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.15s;
    display: flex; align-items: center; justify-content: center;
}
.nav-dot:hover { border-color: var(--c-wti); color: var(--text-primary); }
.nav-dot.active { background: var(--border); color: var(--text-primary); border-color: var(--c-wti); }

/* ── Toolbar ─────────────────────────────────────────────────────────────── */
.toolbar {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 6px;
    padding: 8px 24px;
    border-bottom: 1px solid var(--border);
}
.toolbar-left  { display: flex; flex-direction: column; gap: 4px; }
.toolbar-right { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }

/* ── Scrollytelling sections ─────────────────────────────────────────────── */
section {
    padding-bottom: 60px;
    border-bottom: 1px solid var(--border);
}

.viz-section {
    padding: 0 0 60px;
}

.section-narrative {
    max-width: 680px;
    padding: 40px 24px 20px;
}

.narrative {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.narrative.visible {
    opacity: 1;
    transform: translateY(0);
}

.section-narrative h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
    letter-spacing: -0.2px;
}
.section-narrative p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ── Heatmap selector ────────────────────────────────────────────────────── */
#heatmap-selector {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0 24px 10px;
}

/* ── Map, scatter, race containers ──────────────────────────────────────── */
#map-chart, #heatmap-chart, #scatter-chart, #race-chart {
    display: block;
    width: 100%;
    overflow: visible;
}

#map-wrap {
    padding: 0 24px;
    margin-top: 128px;
}

#section-map {
    padding-top: 8px;
    padding-bottom: 128px;
}
#map-chart {
    display: block;
    width: 100%;
}

#scatter-container,
#race-container,
#heatmap-container,
#map-chart {
    padding: 0 24px;
}

/* ── Slider handle shared style ──────────────────────────────────────────── */
.slider-handle { transition: cx 0.1s; }

input[type=range] {
    accent-color: var(--c-wti);
    cursor: pointer;
}