/* Greeks Explorer (/greeks-explorer). Brilliant.org-style mobile-first.
   Uses styles.css CSS vars (--bg, --surface, --primary, --text, --border).
   Dark mode is inherited via styles.css's @prefers-color-scheme block. */

.ge-container {
    max-width: 1200px;
    margin: 32px auto 80px;
    padding: 0 18px;
    font-family: 'Inter', system-ui, sans-serif;
    color: var(--text, #1F2933);
}

.ge-header { margin-bottom: 24px; }
.ge-header h1 {
    margin: 0 0 8px;
    font-size: 1.95em;
    letter-spacing: -0.01em;
}
.ge-subtitle {
    margin: 0;
    color: var(--text-secondary, #4B5563);
    font-size: 1em;
    line-height: 1.55;
    max-width: 720px;
}

/* ── Controls panel ─────────────────────────────────────────────────── */

.ge-controls {
    background: var(--surface, #FFFFFF);
    border: 1px solid var(--border, #E5E7EB);
    border-radius: 14px;
    padding: 20px;
    margin-bottom: 22px;
    box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}

.ge-toggle-row {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 18px;
    flex-wrap: wrap;
}
.ge-toggle-label {
    font-size: 0.92em;
    font-weight: 600;
    color: var(--text-secondary, #4B5563);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.ge-toggle-group {
    display: inline-flex;
    background: var(--bg, #F2F2F2);
    border: 1px solid var(--border, #E5E7EB);
    border-radius: 999px;
    padding: 3px;
}
.ge-toggle-btn {
    border: 0;
    background: transparent;
    color: var(--text-secondary, #4B5563);
    font: inherit;
    font-weight: 600;
    font-size: 0.95em;
    padding: 8px 18px;
    border-radius: 999px;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
    min-height: 36px;
}
.ge-toggle-btn:hover { color: var(--text, #1F2933); }
.ge-toggle-btn.active {
    background: #2563EB;
    color: #FFFFFF;
    box-shadow: 0 1px 4px rgba(37, 99, 235, 0.35);
}

.ge-slider-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
}
@media (min-width: 720px) {
    .ge-slider-grid {
        grid-template-columns: 1fr 1fr;
        gap: 18px 28px;
        padding-right: 110px;
    }
}

.ge-slider-row {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.ge-slider-label {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    font-size: 0.9em;
    color: var(--text, #1F2933);
}
.ge-slider-name {
    font-weight: 600;
}
.ge-slider-name em {
    font-style: italic;
    color: #2563EB;
}
.ge-slider-val {
    font-variant-numeric: tabular-nums;
    font-size: 0.95em;
    font-weight: 600;
    color: var(--text, #1F2933);
    background: var(--bg, #F2F2F2);
    padding: 2px 10px;
    border-radius: 6px;
    min-width: 56px;
    text-align: right;
}

/* Slider thumb: brand-accent, large touch target. */
.ge-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 44px;            /* min touch target */
    background: transparent;
    cursor: pointer;
    padding: 0;
}
.ge-slider:focus { outline: none; }
.ge-slider::-webkit-slider-runnable-track {
    height: 6px;
    border-radius: 999px;
    background: linear-gradient(to right, #DBEAFE 0%, #93C5FD 50%, #DBEAFE 100%);
    background: var(--border, #E5E7EB);
}
.ge-slider::-moz-range-track {
    height: 6px;
    border-radius: 999px;
    background: var(--border, #E5E7EB);
}
.ge-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: #2563EB;
    border: 3px solid #FFFFFF;
    box-shadow: 0 2px 6px rgba(37, 99, 235, 0.45);
    margin-top: -8px;
    cursor: grab;
    transition: transform 0.08s;
}
.ge-slider::-webkit-slider-thumb:active { transform: scale(1.12); cursor: grabbing; }
.ge-slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: #2563EB;
    border: 3px solid #FFFFFF;
    box-shadow: 0 2px 6px rgba(37, 99, 235, 0.45);
    cursor: grab;
}
.ge-slider:focus-visible::-webkit-slider-thumb {
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.25), 0 2px 6px rgba(37, 99, 235, 0.45);
}

/* ── Charts grid ────────────────────────────────────────────────────── */

/* Mobile tab selector — visible on mobile only. Desktop hides it because the
   2x2 grid has plenty of room. Batch 6 of AI-review punch-list. */
.ge-chart-tabs {
    display: flex;
    gap: 6px;
    margin: 4px 0 14px;
    padding: 4px;
    background: var(--bg, #F2F2F2);
    border-radius: 10px;
}
.ge-chart-tabs .ge-tab {
    flex: 1;
    padding: 8px 4px;
    border: 0;
    background: transparent;
    color: var(--text, #1F2933);
    font-family: inherit;
    font-size: 0.95em;
    font-weight: 700;
    border-radius: 7px;
    cursor: pointer;
    transition: background 0.12s, color 0.12s;
}
.ge-chart-tabs .ge-tab:hover { color: #2563EB; }
.ge-chart-tabs .ge-tab-active {
    background: #FFFFFF;
    color: #1e40af;
    box-shadow: 0 1px 2px rgba(0,0,0,0.06);
}
@media (min-width: 720px) {
    .ge-chart-tabs { display: none; }
}
.ge-chart-card-hidden { display: none !important; }

.ge-charts {
    display: grid;
    grid-template-columns: 1fr;          /* mobile = stack */
    gap: 16px;
    margin-bottom: 22px;
}
@media (min-width: 900px) {
    .ge-charts {
        grid-template-columns: 1fr 1fr;  /* desktop = 2x2 */
        gap: 18px;
    }
}
@media (prefers-color-scheme: dark) {
    .ge-chart-tabs {
        background: #1e293b;
    }
    .ge-chart-tabs .ge-tab { color: #cbd5e1; }
    .ge-chart-tabs .ge-tab:hover { color: #93c5fd; }
    .ge-chart-tabs .ge-tab-active {
        background: #1e3a8a;
        color: #93c5fd;
        box-shadow: none;
    }
}

.ge-chart-card {
    background: var(--surface, #FFFFFF);
    border: 1px solid var(--border, #E5E7EB);
    border-radius: 12px;
    padding: 16px 16px 12px;
    box-shadow: 0 1px 2px rgba(0,0,0,0.04);
    transition: transform 0.12s, box-shadow 0.12s;
}
.ge-chart-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 14px rgba(0,0,0,0.06);
}
.ge-chart-title {
    margin: 0 0 4px;
    font-size: 1.05em;
    font-weight: 700;
    color: var(--text, #1F2933);
}
.ge-chart-def {
    margin: 0 0 6px;
    font-size: 0.88em;
    font-weight: 600;
    line-height: 1.4;
    color: var(--text, #1F2933);
}
.ge-chart-blurb {
    margin: 0 0 10px;
    font-size: 0.85em;
    line-height: 1.45;
    color: var(--text-secondary, #4B5563);
}
.ge-chart-canvas-box {
    position: relative;
    width: 100%;
    height: 244px;
    margin-top: 16px;
    padding: 12px;
    border-radius: 8px;
    background: var(--bg, #F9FAFB);
    box-sizing: border-box;
}
@media (min-width: 900px) {
    .ge-chart-canvas-box { height: 264px; }
}

/* ── Current-values panel ──────────────────────────────────────────── */

.ge-current-panel {
    background: var(--surface, #FFFFFF);
    border: 1px solid var(--border, #E5E7EB);
    border-radius: 14px;
    padding: 18px 20px;
    margin-bottom: 22px;
    box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}
.ge-current-title {
    margin: 0 0 12px;
    font-size: 1em;
    font-weight: 600;
    color: var(--text, #1F2933);
}
.ge-current-title em {
    font-style: italic;
    color: #2563EB;
}
.ge-current-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px 16px;
}
@media (min-width: 720px) {
    .ge-current-grid {
        grid-template-columns: repeat(5, 1fr);
    }
}
.ge-current-cell {
    background: var(--bg, #F2F2F2);
    border-radius: 8px;
    padding: 10px 12px;
}
.ge-current-label {
    font-size: 0.78em;
    color: var(--text-secondary, #4B5563);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 4px;
}
.ge-current-val {
    font-size: 1.15em;
    font-weight: 700;
    color: var(--text, #1F2933);
    font-variant-numeric: tabular-nums;
}
.ge-units-note {
    margin: 14px 0 0;
    font-size: 0.82em;
    color: var(--text-secondary, #4B5563);
    line-height: 1.5;
}

/* ── Intuition cards ───────────────────────────────────────────────── */

.ge-intuition {
    margin-bottom: 24px;
}
.ge-intuition-title {
    margin: 0 0 12px;
    font-size: 1.05em;
    font-weight: 700;
    color: var(--text, #1F2933);
}
.ge-card {
    background: var(--surface, #FFFFFF);
    border: 1px solid var(--border, #E5E7EB);
    border-radius: 12px;
    padding: 14px 18px;
    margin-bottom: 10px;
    box-shadow: 0 1px 2px rgba(0,0,0,0.04);
    transition: transform 0.12s, box-shadow 0.12s, border-color 0.12s;
}
.ge-card:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.06);
    border-color: #93C5FD;
}
.ge-card[open] { border-color: #2563EB; }
.ge-card summary {
    cursor: pointer;
    font-weight: 600;
    font-size: 1em;
    color: var(--text, #1F2933);
    list-style: none;
    padding-right: 100px;
    position: relative;
}
.ge-card summary::-webkit-details-marker { display: none; }
/* Explicit "Tap to reveal" affordance — Batch 7 of AI-review punch-list,
   3-star "feels like dead sub-page hint, no answers visible". */
.ge-card summary::after {
    content: "Tap to reveal +";
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.78em;
    font-weight: 700;
    color: #2563EB;
    background: #EFF6FF;
    padding: 2px 8px;
    border-radius: 999px;
    transition: background 0.18s;
}
.ge-card[open] summary::after { content: "Hide −"; }
.ge-card[open] summary { padding-right: 60px; }
.ge-card-body {
    margin-top: 10px;
    font-size: 0.94em;
    line-height: 1.6;
    color: var(--text-secondary, #4B5563);
}

/* ── Jargon quick-ref box ──────────────────────────────────────────── */

.ge-jargon-box {
    background: var(--surface, #FFFFFF);
    border: 1px solid var(--border, #E5E7EB);
    border-radius: 10px;
    padding: 12px 16px;
    margin-bottom: 14px;
    font-size: 0.9em;
}
.ge-jargon-box > summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--text-secondary, #4B5563);
    list-style: none;
}
.ge-jargon-box > summary::-webkit-details-marker { display: none; }
.ge-jargon-box > summary::before { content: "▶  "; font-size: 0.75em; }
.ge-jargon-box[open] > summary::before { content: "▼  "; }
.ge-jargon-list {
    margin: 10px 0 0;
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 6px 14px;
    align-items: baseline;
}
.ge-jargon-list dt {
    font-weight: 700;
    color: var(--text, #1F2933);
    white-space: nowrap;
}
.ge-jargon-list dd {
    margin: 0;
    color: var(--text-secondary, #4B5563);
    line-height: 1.45;
}
@media (prefers-color-scheme: dark) {
    .ge-jargon-list dt { color: #f1f5f9; }
    .ge-jargon-list dd { color: #94a3b8; }
}

/* ── Footer ─────────────────────────────────────────────────────────── */

.ge-footer {
    margin: 24px 0 8px;
    text-align: center;
    color: var(--text-secondary, #4B5563);
    font-size: 0.95em;
}
.ge-footer a {
    color: #2563EB;
    text-decoration: none;
}
.ge-footer a:hover { text-decoration: underline; }

/* ── Dark-mode tweaks for slider track contrast ───────────────────── */
@media (prefers-color-scheme: dark) {
    .ge-chart-canvas-box { background: #1e293b; }
    .ge-chart-def { color: #e2e8f0; }

    .ge-slider::-webkit-slider-runnable-track {
        background: rgba(148, 163, 184, 0.35);
    }
    .ge-slider::-moz-range-track {
        background: rgba(148, 163, 184, 0.35);
    }
    .ge-slider::-webkit-slider-thumb {
        border-color: #1e293b;
    }
    .ge-slider::-moz-range-thumb {
        border-color: #1e293b;
    }
    .ge-slider-label { color: #E2E8F0; }
    .ge-slider-name em { color: #93c5fd; }
    .ge-slider-val { color: #f1f5f9; background: #0f172a; }
    .ge-current-cell { background: #0f172a; }
    .ge-toggle-group { background: #0f172a; }
    /* Header / footer nav links — default #2563EB fails 4.5:1 on #0f172a. */
    .ge-container a { color: #60a5fa; }
    .ge-container a:hover { color: #93c5fd; }
}