:root {
    --bg-color: #f5f1ea;
    --bg-fade: rgba(245, 241, 234, 0.18);
    --accent: #0d9488;
    --accent-soft: rgba(13, 148, 136, 0.18);
    --accent-dark: #0f766e;
    --text-color: #1f2937;
    --text-muted: #6b7280;
    --glass-bg: rgba(255, 255, 255, 0.82);
    --glass-border: rgba(15, 23, 42, 0.08);
    --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.10);
    --font-family: 'Outfit', sans-serif;
    --idle-opacity: 0.3;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html,
body {
    height: 100%;
    width: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font-family);
    background: var(--bg-color);
    color: var(--text-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

#stage {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100dvh;
    z-index: 1;
    display: block;
    cursor: grab;
    touch-action: none;
}

#stage.is-hovering { cursor: grab; }
#stage.is-dragging { cursor: grabbing; }

/* ====== Idle fade behaviour (matches .back-home-btn) ====== */
.title-overlay,
.toggle-panel,
.control-panel {
    transition: opacity 0.3s ease;
}

.title-overlay:hover,
.title-overlay:focus-within,
.toggle-panel:hover,
.toggle-panel:focus-within,
.control-panel:hover,
.control-panel:focus-within {
    opacity: 1 !important;
}

@keyframes overlayIdle {
    0% { opacity: 1; }
    100% { opacity: var(--idle-opacity); }
}

/* ====== Title overlay (top-right) ====== */
.title-overlay {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: 10;
    width: clamp(240px, 26vw, 340px);
    max-width: calc(100vw - 48px);
    padding: 14px 18px;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    box-shadow: var(--shadow-sm);
    animation: panelFade 600ms ease 0s 1 both,
               overlayIdle 1s ease 3s 1 forwards;
}

.title-overlay h1 {
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: 4px;
    color: var(--accent-dark);
}

.title-overlay p {
    font-size: 0.82rem;
    line-height: 1.45;
    color: var(--text-muted);
    font-weight: 300;
}

/* ====== Toggle panel (right, below title) ====== */
.toggle-panel {
    position: fixed;
    top: 200px;
    right: 24px;
    z-index: 10;
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 12px 14px;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    box-shadow: var(--shadow-sm);
    font-size: 0.85rem;
    animation: panelFade 800ms ease 0s 1 both,
               overlayIdle 1s ease 3s 1 forwards;
}

.toggle-panel label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
    color: var(--text-color);
    transition: color 0.2s ease;
}

.toggle-panel label:hover { color: var(--accent-dark); }

.toggle-panel label.separator {
    margin-top: 6px;
    padding-top: 8px;
    border-top: 1px solid var(--glass-border);
}

.toggle-panel input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border: 1.5px solid var(--accent);
    border-radius: 4px;
    cursor: pointer;
    position: relative;
    transition: background 0.15s ease;
    flex-shrink: 0;
}

.toggle-panel input[type="checkbox"]:checked { background: var(--accent); }

.toggle-panel input[type="checkbox"]:checked::after {
    content: '';
    position: absolute;
    left: 4px;
    top: 0px;
    width: 5px;
    height: 9px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

/* ====== Control panel (bottom, centered) ====== */
.control-panel {
    position: fixed;
    bottom: max(16px, env(safe-area-inset-bottom));
    left: 16px;
    right: 16px;
    margin: 0 auto;
    z-index: 10;
    width: auto;
    max-width: 780px;
    max-height: calc(100dvh - 32px);
    overflow-y: auto;
    padding: 12px 16px;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    animation: panelFade 1000ms ease 0s 1 both,
               overlayIdle 1s ease 3s 1 forwards;
}

.control-row {
    display: flex;
    flex-wrap: wrap;
    gap: 14px 18px;
    align-items: flex-end;
}

.slider-block {
    flex: 1 1 170px;
    min-width: 150px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.slider-block label {
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.slider-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.slider-row input[type="range"] {
    flex: 1;
    min-width: 0;
    height: 4px;
    -webkit-appearance: none;
    appearance: none;
    background: rgba(13, 148, 136, 0.15);
    border-radius: 999px;
    outline: none;
    cursor: pointer;
}

.slider-row input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid white;
    box-shadow: 0 2px 6px rgba(13, 148, 136, 0.45);
    cursor: grab;
    transition: transform 0.15s ease;
}

.slider-row input[type="range"]::-webkit-slider-thumb:active {
    cursor: grabbing;
    transform: scale(1.15);
}

.slider-row input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid white;
    box-shadow: 0 2px 6px rgba(13, 148, 136, 0.45);
    cursor: grab;
}

.value-badge {
    min-width: 42px;
    text-align: right;
    font-variant-numeric: tabular-nums;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--accent-dark);
}

.button-block {
    display: flex;
    flex-direction: row;
    gap: 6px;
    flex: 0 0 auto;
    align-self: flex-end;
}

.button-block button {
    font-family: inherit;
    font-size: 0.82rem;
    font-weight: 500;
    padding: 7px 14px;
    border-radius: 999px;
    border: 1px solid var(--accent);
    background: white;
    color: var(--accent-dark);
    cursor: pointer;
    transition: background 0.15s ease, transform 0.1s ease, box-shadow 0.15s ease;
    white-space: nowrap;
}

.button-block button:hover {
    background: var(--accent-soft);
    box-shadow: 0 2px 8px rgba(13, 148, 136, 0.18);
}

.button-block button:active { transform: translateY(1px); }

.button-block button.primary {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.button-block button.primary:hover { background: var(--accent-dark); }

.metrics-row {
    margin-top: 10px;
    padding-top: 8px;
    border-top: 1px solid var(--glass-border);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px 12px;
    font-size: 0.76rem;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}

.metrics-row .metric {
    display: inline-flex;
    align-items: baseline;
    gap: 6px;
}

.metrics-row .metric-label {
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.7rem;
}

.metrics-row .metric span:last-child {
    color: var(--accent-dark);
    font-weight: 500;
    font-size: 0.85rem;
}

.metrics-row .dot {
    color: var(--text-muted);
    opacity: 0.5;
}

.metrics-row .hint {
    margin-left: auto;
    font-size: 0.72rem;
    opacity: 0.7;
}

@keyframes panelFade {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ====== Mobile / narrow screens ====== */
@media (max-width: 720px) {
    .title-overlay {
        top: 16px;
        right: 16px;
        left: 76px;
        width: auto;
        max-width: none;
        padding: 9px 12px;
    }

    .title-overlay h1 {
        font-size: 0.92rem;
        margin-bottom: 2px;
    }

    .title-overlay p {
        font-size: 0.74rem;
        line-height: 1.35;
    }

    .toggle-panel {
        top: 110px;
        bottom: auto;
        right: 12px;
        padding: 10px 12px;
        font-size: 0.78rem;
        gap: 6px;
        max-height: calc(100dvh - 280px);
        overflow-y: auto;
    }

    .control-panel {
        bottom: max(12px, env(safe-area-inset-bottom));
        left: 12px;
        right: 12px;
        padding: 10px 12px;
        max-height: calc(100dvh - 24px);
    }

    .control-row {
        gap: 10px 12px;
    }

    .slider-block {
        flex: 1 1 calc(50% - 6px);
        min-width: 0;
    }

    .button-block {
        flex: 1 1 100%;
        justify-content: stretch;
    }

    .button-block button {
        flex: 1 1 50%;
    }

    .metrics-row .hint { display: none; }
}

@media (max-width: 460px) {
    .title-overlay p {
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

    .toggle-panel {
        top: 96px;
        font-size: 0.76rem;
        padding: 8px 10px;
    }

    .slider-block {
        flex: 1 1 100%;
    }
}

@media (max-height: 560px) and (min-width: 721px) {
    .toggle-panel {
        top: 110px;
        font-size: 0.78rem;
        padding: 8px 12px;
        gap: 4px;
    }
}