/* /kinematics/assets/kinematics.css */

:root {
    --kin-bg: #050814;
    --kin-panel-bg: #0b1020;
    --kin-border: rgba(255, 255, 255, 0.06);
    --kin-text: #f5f7ff;
    --kin-muted: #a3a8c6;
    --kin-accent-fk: #47c0ff;
    --kin-accent-ik: #ff8a5c;
    --kin-bone: #ecf1ff;
    --kin-joint: #ffffff;
}

/* Root wrapper */
.kinematics-demo {
    margin: 0;
    min-height: 100vh;
    background: radial-gradient(circle at top, #19244a 0, #050814 55%, #02030a 100%);
    color: var(--kin-text);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

/* Layout */
.kinematics-shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem clamp(1.25rem, 4vw, 2.5rem) 2.5rem;
    box-sizing: border-box;
}

/* Header */
.kinematics-header {
    text-align: center;
    margin-bottom: 1.75rem;
}

.kinematics-header h1 {
    font-size: clamp(1.8rem, 3vw, 2.4rem);
    letter-spacing: 0.04em;
    text-transform: uppercase;
    margin: 0 0 0.5rem;
}

.kinematics-lede {
    margin: 0;
    max-width: 42rem;
    margin-inline: auto;
    color: var(--kin-muted);
    font-size: 0.98rem;
}

/* Panels */
.kinematics-panels {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    flex: 1;
}

.kinematics-panel {
    flex: 1 1 260px;
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.02), rgba(0, 0, 0, 0.55));
    border: 1px solid var(--kin-border);
    padding: 1.25rem 1.25rem 1.5rem;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    box-shadow:
        0 20px 40px rgba(0, 0, 0, 0.6),
        inset 0 0 0 1px rgba(255, 255, 255, 0.02);
    position: relative;
    overflow: hidden;
}

.kinematics-panel::before {
    content: "";
    position: absolute;
    inset: -30%;
    background: radial-gradient(circle at top, rgba(255, 255, 255, 0.04), transparent 55%);
    opacity: 0.7;
    pointer-events: none;
    mix-blend-mode: screen;
}

.kinematics-panel__header h2 {
    margin: 0 0 0.25rem;
    font-size: 1.1rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.kinematics-panel__header p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--kin-muted);
}

/* Differentiated accents */
.kinematics-panel--fk .kinematics-panel__header h2 {
    color: var(--kin-accent-fk);
}

.kinematics-panel--ik .kinematics-panel__header h2 {
    color: var(--kin-accent-ik);
}

/* Canvas wrapper */
.kinematics-canvas-wrap {
    position: relative;
    margin-top: 0.5rem;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.05);
    background:
        radial-gradient(circle at top left, rgba(71, 192, 255, 0.2), transparent 55%),
        radial-gradient(circle at bottom right, rgba(255, 138, 92, 0.2), transparent 55%),
        #050817;
}

.kinematics-canvas {
    width: 100%;
    height: min(52vh, 420px);
    display: block;
}

/* Panel hints */
.kinematics-panel__hint {
    margin: 0.35rem 0 0;
    font-size: 0.8rem;
    color: var(--kin-muted);
}

/* Footer */
.kinematics-footer {
    margin-top: 1.75rem;
    font-size: 0.85rem;
    color: var(--kin-muted);
    text-align: center;
    opacity: 0.85;
}

/* Small screens */
@media (max-width: 700px) {
    .kinematics-shell {
        padding-inline: 1rem;
    }

    .kinematics-panel {
        padding: 1rem 1rem 1.25rem;
    }

    .kinematics-canvas {
        height: 260px;
    }
}

/* ---------- Teaching HUD / debug readouts ---------- */

.kinematics-debug {
    margin-top: 0.65rem;
    padding: 0.55rem 0.75rem;
    border-radius: 0.75rem;
    background: radial-gradient(circle at top left,
                rgba(255, 255, 255, 0.06),
                rgba(0, 0, 0, 0.6));
    border: 1px solid rgba(255, 255, 255, 0.06);
    font-size: 0.78rem;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.kinematics-debug__row {
    display: flex;
    justify-content: space-between;
    gap: 0.75rem;
}

.kinematics-debug__label {
    color: var(--kin-muted);
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.kinematics-debug__value {
    font-variant-numeric: tabular-nums;
}

.kinematics-debug__note {
    margin-top: 0.3rem;
    color: var(--kin-muted);
    opacity: 0.9;
}