/*
 * activation-functions.css — Page styles for /activation_function_explorer.jsp.
 *
 * Page lives at the legacy URL outside /ml/, but visually it's a Ch 1
 * sibling of /ml/gradient-descent.jsp, so we use the same .ms-* shell
 * tokens and add a thin .af-* layer for activation-specific UI.
 */

/* ── Two-panel canvas grid ──────────────────────────────────── */
.af-demo {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.85rem;
    align-items: stretch;
}
@media (max-width: 900px) {
    .af-demo { grid-template-columns: 1fr; }
}
.af-canvas-wrap {
    position: relative;
    background: var(--ms-panel-bg);
    border: 1px solid var(--ms-line);
    border-radius: var(--ms-radius);
    overflow: hidden;
    box-shadow: var(--ms-shadow-sm);
}
.af-canvas-wrap canvas {
    display: block;
    width: 100%;
    height: 100%;
    min-height: 320px;
}
.af-canvas-label {
    position: absolute; top: 0.65rem; left: 0.85rem;
    font: 500 0.72rem var(--ms-font-mono);
    color: var(--ms-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    background: var(--ms-panel-bg);
    padding: 0.2rem 0.5rem;
    border-radius: var(--ms-radius-sm);
    border: 1px solid var(--ms-line);
}
.af-canvas-readout {
    position: absolute; bottom: 0.65rem; left: 0.85rem; right: 0.85rem;
    display: flex; justify-content: space-between; gap: 0.5rem;
    font: 500 0.74rem var(--ms-font-mono);
    color: var(--ms-ink-soft);
    pointer-events: none;
}
.af-canvas-readout span {
    background: rgba(254, 253, 251, 0.85);
    padding: 0.18rem 0.5rem;
    border-radius: var(--ms-radius-sm);
    backdrop-filter: blur(4px);
}
[data-theme="dark"] .af-canvas-readout span {
    background: rgba(28, 25, 23, 0.75);
}

/* ── Chip-style activation toggles ──────────────────────────── */
.af-chips {
    display: flex; flex-wrap: wrap; gap: 0.5rem;
    margin-top: 0.85rem;
}
.af-chip {
    display: inline-flex; align-items: center; gap: 0.4rem;
    padding: 0.35rem 0.75rem;
    background: var(--ms-panel-bg);
    border: 1px solid var(--ms-line);
    border-radius: var(--ms-radius-pill);
    font: 500 0.82rem var(--ms-font-sans);
    color: var(--ms-ink-soft);
    cursor: pointer;
    user-select: none;
    transition: all var(--ms-transition);
}
.af-chip:hover { transform: translateY(-1px); box-shadow: var(--ms-shadow-sm); }
.af-chip.is-active {
    background: var(--ms-accent-soft);
    border-color: var(--ms-accent);
    color: var(--ms-accent);
}
.af-chip-dot {
    width: 9px; height: 9px;
    border-radius: 50%;
    background: var(--af-color, var(--ms-muted));
    border: 1.5px solid #fff;
    box-shadow: 0 0 0 1px var(--ms-line);
    flex-shrink: 0;
}

/* ── Controls strip (parameters + domain) ───────────────────── */
.af-controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 0.85rem;
    padding: 1rem 1.1rem;
    background: var(--ms-panel-bg);
    border: 1px solid var(--ms-line);
    border-radius: var(--ms-radius);
    margin-top: 0.85rem;
}
.af-control {
    display: flex; flex-direction: column; gap: 0.35rem;
}
.af-control.is-hidden { display: none; }
.af-control-label {
    display: flex; justify-content: space-between; align-items: baseline;
    font: 500 0.78rem var(--ms-font-sans);
    color: var(--ms-ink-soft);
}
.af-control-value {
    font: 500 0.76rem var(--ms-font-mono);
    color: var(--ms-accent);
}
.af-control input[type="range"] {
    width: 100%;
    appearance: none;
    height: 4px;
    background: var(--ms-accent-soft);
    border-radius: var(--ms-radius-pill);
    outline: none;
    cursor: pointer;
}
.af-control input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 16px; height: 16px;
    background: var(--ms-accent);
    border-radius: 50%;
    cursor: pointer;
    transition: transform var(--ms-transition);
}
.af-control input[type="range"]::-moz-range-thumb {
    width: 16px; height: 16px;
    background: var(--ms-accent);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}
.af-control input[type="range"]:hover::-webkit-slider-thumb { transform: scale(1.15); }
.af-control select,
.af-control input[type="number"] {
    padding: 0.45rem 0.6rem;
    font: 500 0.85rem var(--ms-font-sans);
    color: var(--ms-ink);
    background: var(--ms-panel-bg-soft);
    border: 1px solid var(--ms-line);
    border-radius: var(--ms-radius-sm);
    outline: none;
    transition: border-color var(--ms-transition), box-shadow var(--ms-transition);
}
.af-control select:focus,
.af-control input[type="number"]:focus {
    border-color: var(--ms-accent);
    box-shadow: var(--ms-ring);
}

/* ── Action row ─────────────────────────────────────────────── */
.af-actions {
    display: flex; gap: 0.6rem; flex-wrap: wrap;
    margin-top: 0.85rem;
}
.af-btn {
    display: inline-flex; align-items: center; gap: 0.45rem;
    padding: 0.55rem 1.1rem;
    font: 500 0.86rem var(--ms-font-sans);
    border-radius: var(--ms-radius-sm);
    border: 1px solid var(--ms-line);
    background: var(--ms-panel-bg);
    color: var(--ms-ink);
    cursor: pointer;
    transition: transform var(--ms-transition),
                background var(--ms-transition),
                box-shadow var(--ms-transition);
}
.af-btn:hover { transform: translateY(-1px); box-shadow: var(--ms-shadow-sm); }
.af-btn:active { transform: translateY(0); }

/* ── Formula grid (the math card) ───────────────────────────── */
.af-formula-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 0.85rem;
}
.af-formula-card {
    background: var(--ms-panel-bg-soft);
    border: 1px solid var(--ms-line);
    border-left: 3px solid var(--af-color, var(--ms-accent));
    border-radius: var(--ms-radius-sm);
    padding: 0.85rem 1rem;
}
.af-formula-head {
    display: flex; align-items: center; justify-content: space-between;
    gap: 0.5rem; margin-bottom: 0.45rem;
}
.af-formula-title {
    display: inline-flex; align-items: center; gap: 0.45rem;
    font: 600 0.92rem var(--ms-font-sans);
    color: var(--ms-ink);
}
.af-formula-dot {
    width: 10px; height: 10px;
    border-radius: 50%;
    background: var(--af-color, var(--ms-accent));
}
.af-formula-range {
    font: 500 0.72rem var(--ms-font-mono);
    color: var(--ms-muted);
}
.af-formula-card .af-formula-row {
    margin: 0.35rem 0;
    font: 0.85rem var(--ms-font-sans);
    color: var(--ms-ink-soft);
}
.af-formula-card .af-formula-row .katex-display {
    margin: 0.3rem 0 !important;
    text-align: left !important;
}
.af-formula-card .af-formula-row .katex-display > .katex {
    text-align: left !important;
}
.af-formula-note {
    font: italic 0.78rem var(--ms-font-sans);
    color: var(--ms-muted);
    margin-top: 0.4rem;
}

/* ── Try this exercises ─────────────────────────────────────── */
.af-try {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 0.75rem;
}
.af-try-item {
    padding: 0.85rem 1rem;
    background: var(--ms-panel-bg-soft);
    border: 1px solid var(--ms-line);
    border-radius: var(--ms-radius-sm);
}
.af-try-item h4 {
    font: 500 0.88rem var(--ms-font-sans);
    color: var(--ms-ink);
    margin: 0 0 0.3rem;
}
.af-try-item p {
    font: 0.82rem/1.5 var(--ms-font-sans);
    color: var(--ms-muted);
    margin: 0;
}
.af-try-item code {
    font: 0.78rem var(--ms-font-mono);
    color: var(--ms-accent);
    background: var(--ms-accent-soft);
    padding: 0.05rem 0.3rem;
    border-radius: 3px;
}