/* Explain: Styles for reusable UI elements like buttons and panels. */
.site-header {
    background: linear-gradient(180deg, rgba(15, 23, 42, 0.9), rgba(15, 23, 42, 0.6));
    backdrop-filter: blur(18px);
}

.section-kicker {
    display: inline-flex;
    align-items: center;
    gap: 0.7rem;
    color: var(--secondary-color);
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.glass-panel {
    border: 1px solid var(--glass-border);
    background: linear-gradient(145deg, rgba(30, 41, 59, 0.8), rgba(15, 23, 42, 0.9));
    box-shadow: var(--shadow-soft);
    backdrop-filter: blur(18px);
}

.generating-pulse {
    animation: pulse-glow 2s infinite alternate;
}

@keyframes pulse-glow {
    0% { box-shadow: 0 0 15px rgba(107, 70, 193, 0.3); border-color: rgba(107, 70, 193, 0.5); }
    100% { box-shadow: 0 0 30px rgba(159, 122, 234, 0.6); border-color: rgba(159, 122, 234, 0.8); }
}

.player-controls button {
    transition: all 0.2s ease-in-out;
}
.player-controls button:hover {
    transform: scale(1.05);
}
.player-controls button:active {
    transform: scale(0.95);
}

/* Music & sound-effect pickers */
.picker-list {
    max-height: 260px;
    overflow-y: auto;
    border: 1px solid var(--glass-border);
    border-radius: 1.25rem;
    background: var(--background-color);
    padding: 0.5rem;
}

.picker-cat {
    position: sticky;
    top: -0.5rem;
    z-index: 1;
    margin: 0;
    padding: 0.6rem 0.75rem 0.4rem;
    font-size: 0.7rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent-color);
    background: var(--background-color);
}

.picker-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    width: 100%;
    text-align: start;
    padding: 0.6rem 0.75rem;
    border: 0;
    background: transparent;
    border-radius: 0.9rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease;
}

.picker-item:hover {
    background: var(--glass-bg);
    color: var(--text-color);
}

.picker-item.is-selected {
    background: var(--primary-color);
    color: #ffffff;
}

.picker-item i {
    opacity: 0;
    font-size: 0.8rem;
}

.picker-item.is-selected i {
    opacity: 1;
}

.picker-empty {
    padding: 1.5rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.picker-list::-webkit-scrollbar {
    width: 6px;
}
.picker-list::-webkit-scrollbar-thumb {
    background: var(--accent-color);
    border-radius: 10px;
}

.sfx-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.35rem 0.7rem;
    border-radius: 999px;
    background: var(--sage-soft);
    border: 1px solid var(--glass-border);
    color: var(--secondary-color);
    font-size: 0.8rem;
    font-weight: 700;
}

.sfx-chip button {
    display: inline-flex;
    align-items: center;
    border: 0;
    background: transparent;
    color: inherit;
    cursor: pointer;
    opacity: 0.8;
}

.sfx-chip button:hover {
    opacity: 1;
}