/*
 * perceptron.css — page styles for the 3D perceptron demo.
 *
 * Mirrors .lr-* (Logistic Regression) and .pca-* (PCA) shape, with
 * the .pn-* prefix.  3D scatter on top (Plotly), 2D loss curve below
 * (Chart.js), grouped controls underneath.
 */

/* ── 3D viewer ─────────────────────────────────────────────── */
.pn-3d-wrap {
    position: relative;
    background: var(--ms-panel-bg);
    border: 1px solid var(--ms-line);
    border-radius: var(--ms-radius);
    overflow: hidden;
    padding: 1rem;
    box-shadow: var(--ms-shadow-sm);
}
.pn-3d-label {
    font: 500 0.72rem var(--ms-font-mono);
    color: var(--ms-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 0.45rem;
    display: flex; justify-content: space-between;
    align-items: center;
}
.pn-3d-label .pn-readout {
    font: 500 0.74rem var(--ms-font-mono);
    color: var(--ms-ink);
    text-transform: none;
    letter-spacing: 0;
}
.pn-3d-area {
    position: relative;
    width: 100%;
    height: 420px;
}
.pn-3d {
    width: 100% !important;
    height: 100% !important;
}
.pn-3d .modebar {
    background: transparent !important;
    opacity: 0.4;
    transition: opacity var(--ms-transition);
}
.pn-3d-wrap:hover .modebar { opacity: 1; }

.pn-legend {
    display: flex; gap: 0.85rem; flex-wrap: wrap;
    font: 500 0.78rem var(--ms-font-sans);
    color: var(--ms-ink-soft);
    margin-top: 0.55rem;
}
.pn-legend-dot {
    display: inline-block; width: 10px; height: 10px;
    border-radius: 50%; margin-right: 0.3rem;
    vertical-align: middle;
}
.pn-legend-dot.pn-pos  { background: #22c55e; }
.pn-legend-dot.pn-neg  { background: #ef4444; }
.pn-legend-dot.pn-mis  { background: #fff; border: 2px solid #f59e0b; box-sizing: border-box; }
.pn-legend-dot.pn-norm { background: #4f46e5; }
.pn-legend-dot.pn-plane{
    background: rgba(79,70,229,0.3);
    border: 1px solid #4f46e5;
}

/* ── Loss curve (Chart.js, smaller) ────────────────────────── */
.pn-loss-wrap {
    position: relative;
    background: var(--ms-panel-bg);
    border: 1px solid var(--ms-line);
    border-radius: var(--ms-radius);
    padding: 1rem;
    margin-top: 0.85rem;
    box-shadow: var(--ms-shadow-sm);
}
.pn-loss-label {
    font: 500 0.72rem var(--ms-font-mono);
    color: var(--ms-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 0.45rem;
    display: flex; justify-content: space-between;
    align-items: center;
}
.pn-loss-area {
    position: relative;
    width: 100%;
    height: 200px;
}
.pn-loss-area canvas {
    width: 100% !important;
    height: 100% !important;
}

/* ── KPI row ───────────────────────────────────────────────── */
.pn-kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 0.75rem;
    margin-top: 0.85rem;
}
.pn-kpi {
    padding: 0.75rem 0.95rem;
    background: var(--ms-panel-bg-soft);
    border: 1px solid var(--ms-line);
    border-radius: var(--ms-radius-sm);
    border-top: 3px solid #4f46e5;
}
.pn-kpi-label {
    font: 500 0.66rem var(--ms-font-mono);
    color: var(--ms-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}
.pn-kpi-value {
    font: 600 1.4rem var(--ms-font-serif);
    color: var(--ms-ink);
    margin-top: 0.15rem;
    letter-spacing: -0.01em;
}

/* ── Convergence banner ────────────────────────────────────── */
.pn-converge {
    display: none;
    align-items: center;
    gap: 0.85rem;
    margin-top: 0.85rem;
    padding: 0.85rem 1.1rem;
    border-radius: var(--ms-radius);
    font: 500 0.92rem var(--ms-font-sans);
    animation: pn-converge-pop 0.55s var(--ms-ease);
}
.pn-converge.is-visible { display: flex; }
.pn-converge.is-converged {
    background: linear-gradient(135deg, rgba(34,197,94,0.10), rgba(21,128,61,0.06));
    border: 1px solid rgba(34,197,94,0.4);
    color: #15803d;
}
.pn-converge.is-converged::before {
    content: '🏆';
    font-size: 1.6rem;
    filter: drop-shadow(0 1px 4px rgba(245,158,11,0.4));
}
.pn-converge.is-stuck {
    background: rgba(245, 158, 11, 0.06);
    border: 1px solid rgba(245, 158, 11, 0.4);
    color: #b45309;
}
.pn-converge.is-stuck::before {
    content: '⚠';
    font-size: 1.4rem;
}
[data-theme="dark"] .pn-converge.is-converged { color: #86efac; }
[data-theme="dark"] .pn-converge.is-stuck     { color: #fbbf24; }
.pn-converge strong { font-weight: 700; }
@keyframes pn-converge-pop {
    0%   { opacity: 0; transform: scale(0.96); }
    60%  { opacity: 1; transform: scale(1.015); }
    100% { transform: scale(1); }
}

/* ── Controls — grouped (mirrors .lr-control-group) ────────── */
.pn-control-group {
    margin-bottom: 1.1rem;
}
.pn-control-group:last-child { margin-bottom: 0; }
.pn-control-group-head {
    display: flex; align-items: baseline; gap: 0.45rem;
    margin-bottom: 0.5rem;
    font: 500 0.75rem var(--ms-font-mono);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}
.pn-control-group-head .pn-cgh-label { color: var(--ms-accent); }
.pn-control-group-head .pn-cgh-desc {
    text-transform: none; letter-spacing: 0;
    font: italic 0.78rem var(--ms-font-sans);
    color: var(--ms-muted);
}
.pn-control-group-body {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 0.85rem;
}
.pn-control {
    display: flex; flex-direction: column; gap: 0.35rem;
}
.pn-control-label {
    display: flex; justify-content: space-between; align-items: baseline;
    font: 500 0.78rem var(--ms-font-sans);
    color: var(--ms-ink-soft);
}
.pn-control-value {
    font: 500 0.76rem var(--ms-font-mono);
    color: var(--ms-accent);
}
.pn-control input[type="range"] {
    width: 100%;
    appearance: none;
    height: 4px;
    background: var(--ms-accent-soft);
    border-radius: var(--ms-radius-pill);
    cursor: pointer;
}
.pn-control input[type="range"]::-webkit-slider-thumb {
    appearance: none; width: 16px; height: 16px;
    background: var(--ms-accent); border-radius: 50%; cursor: pointer;
}
.pn-control input[type="range"]::-moz-range-thumb {
    width: 16px; height: 16px; background: var(--ms-accent);
    border-radius: 50%; border: none;
}
.pn-control select,
.pn-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;
}
.pn-control-sublabel {
    font: 0.72rem var(--ms-font-sans);
    color: var(--ms-muted);
    font-style: italic;
    margin-top: -0.15rem;
}

/* ── Action row ────────────────────────────────────────────── */
.pn-actions {
    display: flex; gap: 0.5rem; flex-wrap: wrap;
    margin-top: 0.85rem;
}
.pn-btn {
    display: inline-flex; align-items: center; gap: 0.4rem;
    padding: 0.5rem 0.95rem;
    font: 500 0.84rem 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), box-shadow var(--ms-transition);
}
.pn-btn:hover { transform: translateY(-1px); box-shadow: var(--ms-shadow-sm); }
.pn-btn.is-primary {
    background: linear-gradient(135deg, var(--ms-cta-start), var(--ms-cta-end));
    color: #fff;
    border-color: transparent;
}
.pn-btn.is-warn {
    background: var(--ms-panel-bg-soft);
    color: #b45309;
    border-color: rgba(245, 158, 11, 0.35);
}

.pn-preset-row {
    display: flex; gap: 0.4rem; flex-wrap: wrap;
    margin-top: 0.5rem;
}
.pn-preset-label {
    font: 500 0.72rem var(--ms-font-mono);
    color: var(--ms-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-right: 0.3rem;
    align-self: center;
}
.pn-preset {
    padding: 0.3rem 0.7rem;
    font: 500 0.78rem var(--ms-font-sans);
    background: var(--ms-panel-bg);
    border: 1px solid var(--ms-line);
    border-radius: var(--ms-radius-pill);
    cursor: pointer;
    color: var(--ms-ink-soft);
}
.pn-preset:hover { border-color: var(--ms-accent); color: var(--ms-accent); }

/* ── Math card ─────────────────────────────────────────────── */
.pn-math {
    display: grid; grid-template-columns: 1fr; gap: 0.75rem;
}
.pn-math-step {
    padding: 0.85rem 1rem;
    background: var(--ms-panel-bg-soft);
    border-left: 3px solid var(--ms-accent);
    border-radius: var(--ms-radius-sm);
}
.pn-math-step h4 {
    font: 500 0.85rem var(--ms-font-sans);
    color: var(--ms-ink);
    margin: 0 0 0.45rem;
}
.pn-math-step p {
    font: 0.86rem/1.55 var(--ms-font-sans);
    color: var(--ms-ink-soft);
    margin: 0;
}
.pn-math-step .katex-display { margin: 0.5rem 0 0 !important; }

/* ── Try this + chip strips (same shape as logreg) ─────────── */
.pn-try {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 0.75rem;
}
.pn-try-item {
    padding: 0.85rem 1rem;
    background: var(--ms-panel-bg-soft);
    border: 1px solid var(--ms-line);
    border-radius: var(--ms-radius-sm);
}
.pn-try-item h4 {
    font: 500 0.88rem var(--ms-font-sans);
    color: var(--ms-ink);
    margin: 0 0 0.3rem;
}
.pn-try-item p {
    font: 0.82rem/1.5 var(--ms-font-sans);
    color: var(--ms-muted);
    margin: 0;
}
.pn-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;
}

.pn-strip {
    display: flex; flex-wrap: wrap; gap: 0.4rem;
    align-items: center;
    padding: 0.55rem 0.85rem;
    margin: 0.65rem 0;
    border-radius: var(--ms-radius-sm);
    background: var(--ms-panel-bg-soft);
    border-left: 3px solid var(--ms-line);
}
.pn-strip-label {
    display: inline-flex; align-items: center; gap: 0.3rem;
    font: 500 0.7rem var(--ms-font-mono);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--ms-muted);
    margin-right: 0.4rem;
    flex-shrink: 0;
}
.pn-strip.is-watchout {
    background: rgba(245, 158, 11, 0.05);
    border-left-color: #f59e0b;
}
.pn-strip.is-watchout .pn-strip-label { color: #b45309; }
[data-theme="dark"] .pn-strip.is-watchout .pn-strip-label { color: #fbbf24; }
.pn-strip.is-practice {
    background: rgba(34, 197, 94, 0.04);
    border-left-color: #15803d;
}
.pn-strip.is-practice .pn-strip-label { color: #15803d; }
[data-theme="dark"] .pn-strip.is-practice .pn-strip-label { color: #86efac; }
.pn-tag {
    display: inline-flex; align-items: center;
    padding: 0.2rem 0.6rem;
    background: var(--ms-panel-bg);
    border: 1px solid var(--ms-line);
    border-radius: var(--ms-radius-pill);
    font: 500 0.76rem var(--ms-font-sans);
    color: var(--ms-ink-soft);
    white-space: nowrap;
}
.pn-strip.is-practice .pn-tag {
    font-family: var(--ms-font-mono);
    font-size: 0.74rem;
    color: var(--ms-accent);
    background: var(--ms-accent-softer);
    border-color: var(--ms-accent-soft);
}