.physics-lab {
    min-height: calc(100dvh - 6rem);
    display: grid;
    grid-template-rows: auto minmax(420px, 1fr);
    gap: 1rem;
}

.physics-toolbar {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 1rem;
}

.physics-toolbar h1,
.physics-panel h2 {
    margin: 0;
    letter-spacing: 0;
}

.physics-toolbar h1 {
    font-size: clamp(1.6rem, 3vw, 2.6rem);
    line-height: 1.05;
}

.physics-panel h2 {
    font-size: 1.1rem;
}

.physics-kicker {
    margin: 0 0 0.25rem;
    color: #67e8f9;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
}

.physics-toolbar-actions,
.physics-panel-section {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.physics-button,
.physics-icon-button,
.physics-settings-toggle,
.physics-game-toggle {
    min-width: 44px;
    min-height: 44px;
    border: 1px solid rgba(148, 163, 184, 0.34);
    border-radius: 8px;
    color: #f8fafc;
    background: rgba(15, 23, 42, 0.88);
    font: inherit;
    font-size: 0.88rem;
    font-weight: 700;
    cursor: pointer;
    transition: border-color 180ms ease, background 180ms ease, transform 180ms ease;
}

.physics-button {
    padding: 0.6rem 0.85rem;
}

.physics-button:hover,
.physics-button:focus-visible,
.physics-icon-button:hover,
.physics-icon-button:focus-visible,
.physics-settings-toggle:hover,
.physics-settings-toggle:focus-visible,
.physics-game-toggle:hover,
.physics-game-toggle:focus-visible {
    border-color: #67e8f9;
    background: rgba(8, 47, 73, 0.96);
    outline: 3px solid rgba(103, 232, 249, 0.22);
    outline-offset: 2px;
}

.physics-button:active,
.physics-icon-button:active,
.physics-settings-toggle:active,
.physics-game-toggle:active {
    transform: translateY(1px);
}

.physics-button-accent {
    border-color: rgba(249, 115, 22, 0.72);
    background: #c2410c;
}

.physics-button-accent:hover,
.physics-button-accent:focus-visible {
    border-color: #fdba74;
    background: #ea580c;
}

.physics-button-player {
    border-color: rgba(34, 197, 94, 0.72);
    background: #15803d;
}

.physics-button-player:hover,
.physics-button-player:focus-visible {
    border-color: #86efac;
    background: #16a34a;
}

.physics-button-danger {
    border-color: rgba(248, 113, 113, 0.72);
    background: #991b1b;
}

.physics-button-danger:hover,
.physics-button-danger:focus-visible {
    border-color: #fca5a5;
    background: #b91c1c;
}

.physics-jump-modes {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.physics-jump-modes .physics-button.active {
    border-color: #67e8f9;
    background: #0e7490;
    box-shadow: inset 0 0 0 1px rgba(248, 250, 252, 0.3);
}

.physics-stage {
    position: relative;
    min-height: 420px;
    overflow: hidden;
    border: 1px solid rgba(148, 163, 184, 0.22);
    border-radius: 12px;
    background: #030712;
}

#physics-canvas {
    width: 100%;
    height: 100%;
    min-height: 420px;
    display: block;
    touch-action: manipulation;
    background: #030712;
}

.physics-hud {
    position: absolute;
    top: 0.75rem;
    left: 0.75rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    max-width: calc(100% - 5.5rem);
    pointer-events: none;
}

.physics-hud span {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    min-height: 32px;
    padding: 0.35rem 0.55rem;
    border: 1px solid rgba(148, 163, 184, 0.25);
    border-radius: 8px;
    background: rgba(2, 6, 23, 0.78);
    color: rgba(226, 232, 240, 0.86);
    font: 0.78rem/1.2 "JetBrains Mono", "Cascadia Mono", Consolas, monospace;
}

.physics-hud strong {
    min-width: 2ch;
    color: #f8fafc;
    font-weight: 700;
    text-align: right;
}

.physics-game-hud {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 0.45rem;
    max-width: calc(100% - 6rem);
    pointer-events: none;
}

.physics-game-hud span {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    min-height: 32px;
    padding: 0.35rem 0.55rem;
    border: 1px solid rgba(45, 212, 191, 0.28);
    border-radius: 8px;
    background: rgba(6, 78, 59, 0.72);
    color: rgba(240, 253, 250, 0.88);
    font: 0.78rem/1.2 "JetBrains Mono", "Cascadia Mono", Consolas, monospace;
}

.physics-game-hud strong {
    color: #f8fafc;
    font-weight: 700;
}

.physics-settings-toggle,
.physics-game-toggle {
    position: absolute;
    top: 50%;
    z-index: 4;
    width: 48px;
    padding: 0;
    display: grid;
    place-items: center;
    gap: 0;
    box-shadow: 0 14px 34px rgba(0, 0, 0, 0.28);
}

.physics-settings-toggle {
    right: 0.75rem;
}

.physics-game-toggle {
    left: 0.75rem;
}

.physics-settings-toggle span,
.physics-game-toggle span {
    width: 20px;
    height: 2px;
    margin: -9px 0;
    display: block;
    border-radius: 999px;
    background: #f8fafc;
}

.physics-panel {
    position: absolute;
    top: 0;
    right: 0;
    z-index: 5;
    width: min(392px, calc(100vw - 2rem));
    height: 100%;
    overflow: auto;
    padding: 1rem;
    border-left: 1px solid rgba(148, 163, 184, 0.28);
    background: rgba(8, 13, 28, 0.98);
    box-shadow: -22px 0 52px rgba(0, 0, 0, 0.38);
    transform: translateX(calc(100% + 1px));
    transition: transform 220ms ease;
}

.physics-panel.open {
    transform: translateX(0);
}

.physics-panel-left {
    right: auto;
    left: 0;
    border-right: 1px solid rgba(148, 163, 184, 0.28);
    border-left: 0;
    box-shadow: 22px 0 52px rgba(0, 0, 0, 0.38);
    transform: translateX(calc(-100% - 1px));
}

.physics-panel-left.open {
    transform: translateX(0);
}

.physics-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding-bottom: 0.85rem;
    border-bottom: 1px solid rgba(148, 163, 184, 0.22);
}

.physics-icon-button {
    width: 44px;
    padding: 0;
}

.physics-panel-section {
    padding: 0.9rem 0;
    border-bottom: 1px solid rgba(148, 163, 184, 0.18);
}

.physics-panel-section.compact {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.physics-panel-section label {
    min-height: 44px;
    display: flex;
    align-items: center;
    gap: 0.55rem;
    color: #e2e8f0;
    font-size: 0.88rem;
    cursor: pointer;
}

.physics-panel input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: #22c55e;
}

.physics-sliders {
    display: grid;
    gap: 0.85rem;
    padding-top: 0.9rem;
}

.physics-sliders label {
    display: grid;
    gap: 0.45rem;
}

.physics-sliders span {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    color: #e2e8f0;
    font-size: 0.86rem;
}

.physics-sliders output {
    min-width: 6ch;
    color: #fdba74;
    font-family: "JetBrains Mono", "Cascadia Mono", Consolas, monospace;
    text-align: right;
}

.physics-sliders input[type="range"] {
    width: 100%;
    accent-color: #38bdf8;
}

@media (max-width: 760px) {
    .physics-lab {
        grid-template-rows: auto minmax(560px, 1fr);
    }

    .physics-toolbar {
        align-items: stretch;
        flex-direction: column;
    }

    .physics-toolbar-actions {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .physics-button {
        padding-inline: 0.6rem;
    }

    .physics-stage,
    #physics-canvas {
        min-height: 560px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .physics-button,
    .physics-icon-button,
    .physics-settings-toggle,
    .physics-game-toggle,
    .physics-panel {
        transition: none;
    }
}