/* --- algorithm picker trigger --- */

.algo-picker-toggle {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--panel-border);
    border-radius: 4px;
    padding: 8px 10px;
    font: inherit;
    font-size: 0.85rem;
    cursor: pointer;
    text-align: left;
}

.algo-picker-toggle:hover,
.algo-picker-toggle:focus-visible {
    border-color: var(--teal);
    color: var(--teal);
    outline: none;
}

.algo-picker-hint {
    font-size: 0.65rem;
    color: var(--text-dim);
    flex-shrink: 0;
}

/* --- algorithm/command palette/modal overlay --- */

.command-palette-backdrop {
    position: fixed;
    inset: 0;
    z-index: 100;
    background: rgba(8, 10, 24, 0.7);
    display: flex;
    justify-content: center;
    padding-top: 12vh;
}

.command-palette-backdrop.hidden {
    display: none;
}

.command-palette {
    width: 480px;
    max-width: 90vw;
    max-height: 70vh;
    display: flex;
    flex-direction: column;
    gap: 10px;
    background: var(--panel);
    border: 1px solid var(--panel-border);
    border-radius: 8px;
    padding: 14px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.command-palette-search {
    width: 100%;
    box-sizing: border-box;
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--panel-border);
    border-radius: 6px;
    padding: 10px 12px;
    font: inherit;
    font-size: 0.95rem;
}

.command-palette-search:focus-visible {
    outline: 2px solid var(--teal);
    outline-offset: 1px;
}

.command-palette-list {
    overflow-y: auto;
}

.algo-picker-group-label {
    margin: 10px 0 4px;
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-dim);
}

.algo-picker-group-label:first-child {
    margin-top: 0;
}

.command-palette-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.chip:hover,
.chip:focus-visible {
    border-color: var(--teal);
    color: var(--teal);
    outline: none;
}

.chip.active {
    background: var(--teal);
    border-color: var(--teal);
    color: var(--bg);
    font-weight: 700;
}

.command-palette-empty {
    padding: 16px 8px;
    text-align: center;
    color: var(--text-dim);
    font-size: 0.8rem;
}

.command-palette-toolbar {
    display: flex;
    gap: 8px;
}

.palette-select {
    flex: 1;
    font-size: 0.78rem;
    padding: 6px 8px;
}

.algo-picker-option {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    background: transparent;
    border: none;
    border-radius: 4px;
    padding: 8px 10px;
    font: inherit;
    font-size: 0.85rem;
    color: var(--text);
    cursor: pointer;
    text-align: left;
}

.algo-picker-option-complexity {
    font-size: 0.68rem;
    color: var(--text-dim);
    white-space: nowrap;
    flex-shrink: 0;
}

.algo-picker-option:hover,
.algo-picker-option.active {
    background: rgba(62, 201, 176, 0.14);
    color: var(--teal);
}

/* --- description popup --- */

.description-row {
    position: relative;
}

.description-row.hidden {
    display: none;
}

.algorithm-description {
    margin: 0;
    padding-right: 20px;
    font-size: 0.72rem;
    line-height: 1.5;
    max-height: 3em;
    overflow: hidden;
    position: relative;
    color: var(--text-dim);
}

.algorithm-description::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 20px;
    height: 1.4em;
    background: linear-gradient(to bottom, transparent, var(--panel));
}

.info-btn {
    position: absolute;
    top: 0;
    right: 0;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: 1px solid var(--panel-border);
    background: var(--bg);
    color: var(--text-dim);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    font-style: italic;
    line-height: 1;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.info-btn:hover,
.info-btn:focus-visible {
    color: var(--teal);
    border-color: var(--teal);
    outline: none;
}

.description-popup {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    width: 100%;
    z-index: 20;
    background: var(--bg);
    border: 1px solid var(--panel-border);
    border-radius: 6px;
    padding: 10px 12px;
    font-size: 0.72rem;
    line-height: 1.5;
    color: var(--text);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-4px);
    transition: opacity 0.12s ease, transform 0.12s ease;
}

.description-row:hover .description-popup,
.description-popup.open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

/* --- media query --- */

@media (max-width: 860px) {
    .command-palette-backdrop {
        padding-top: 8vh;
    }
}

@media (max-width: 480px) {
    .command-palette {
        padding: 10px;
    }
}