/* Global animated wave background (canvas) + calm controls */
:root {
    --wave-controls-bg: rgba(12, 14, 32, 0.55);
    --wave-controls-border: rgba(255, 255, 255, 0.12);
    --wave-controls-text: rgba(255, 255, 255, 0.9);
    --wave-controls-muted: rgba(255, 255, 255, 0.65);
    --wave-controls-accent: rgba(255, 215, 0, 0.9);
}

.wave-bg {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
}

body > :not(.wave-bg):not(.wave-controls) {
    z-index: 1;
}

.wave-bg canvas {
    width: 100%;
    height: 100%;
    display: block;
    opacity: 0.55;
    filter: saturate(1.08) contrast(1.05);
}

.wave-controls {
    position: fixed;
    right: 18px;
    bottom: 18px;
    z-index: 9999;
    width: min(340px, calc(100vw - 36px));
    padding: 14px 14px 12px;
    border-radius: 16px;
    background: var(--wave-controls-bg);
    border: 1px solid var(--wave-controls-border);
    color: var(--wave-controls-text);
    backdrop-filter: blur(10px);
    box-shadow: 0 22px 50px rgba(0, 0, 0, 0.32);
}

.wave-controls[hidden] {
    display: none;
}

.wave-controls.is-collapsed {
    padding: 10px 12px;
    width: auto;
}
.wave-controls.is-collapsed .wave-controls__row,
.wave-controls.is-collapsed input[type="range"],
.wave-controls.is-collapsed .wave-controls__hint {
    display: none;
}

.wave-controls__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 10px;
}

.wave-controls__title {
    font-weight: 700;
    letter-spacing: 0.03em;
    font-size: 0.95rem;
    opacity: 0.95;
}

.wave-controls__toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--wave-controls-muted);
    user-select: none;
}

.wave-controls__toggle button {
    appearance: none;
    border: 1px solid var(--wave-controls-border);
    background: rgba(255, 255, 255, 0.08);
    color: var(--wave-controls-text);
    border-radius: 999px;
    padding: 6px 10px;
    cursor: pointer;
    transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

.wave-controls__toggle button:hover {
    background: rgba(255, 255, 255, 0.12);
    transform: translateY(-1px);
}

.wave-controls__toggle button:active {
    transform: translateY(0);
}

.wave-controls__row {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 12px;
    margin: 10px 0;
}

.wave-controls label {
    font-size: 0.85rem;
    color: var(--wave-controls-muted);
}

.wave-controls input[type="range"] {
    width: 100%;
    accent-color: var(--wave-controls-accent);
}

.wave-controls__value {
    font-variant-numeric: tabular-nums;
    font-size: 0.85rem;
    color: var(--wave-controls-text);
    opacity: 0.95;
    min-width: 48px;
    text-align: right;
}

.wave-controls__hint {
    margin-top: 10px;
    font-size: 0.78rem;
    color: rgba(255, 255, 255, 0.55);
    line-height: 1.35;
}

@media (max-width: 640px) {
    .wave-controls {
        right: 12px;
        bottom: 12px;
        padding: 12px 12px 10px;
        border-radius: 14px;
    }
}