/* ===============================================================
   ToolDuck — Universal Unit Converter Styles
   Scoped under .uc-app
   =============================================================== */

.uc-app {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

/* Category Tabs / Nav */
.uc-categories {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    padding: 0.75rem 1rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md, 8px);
}

.uc-cat-btn {
    padding: 6px 14px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--ink-2);
    background: transparent;
    border: 1px solid transparent;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.uc-cat-btn:hover {
    color: var(--ink);
    background: var(--bg-muted);
}

.uc-cat-btn.is-active {
    background: var(--primary, #1d4ed8);
    color: #ffffff;
    font-weight: 600;
}

/* Conversion Workspace */
.uc-workspace {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 1.25rem;
    align-items: center;
    padding: 1.5rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md, 8px);
}

@media (max-width: 768px) {
    .uc-workspace {
        grid-template-columns: 1fr;
    }
}

.uc-pane {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.uc-pane-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--ink-2);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.uc-input-row {
    display: flex;
    gap: 0.5rem;
}

.uc-input {
    flex: 1;
    padding: 0.75rem 1rem;
    font-size: 1.25rem;
    font-weight: 600;
    font-family: inherit;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg);
    color: var(--ink);
}

.uc-input:focus {
    outline: 2px solid var(--primary, #1d4ed8);
    outline-offset: 1px;
}

.uc-select {
    padding: 0.75rem 0.85rem;
    font-size: 0.92rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg);
    color: var(--ink);
    cursor: pointer;
}

.uc-swap-container {
    display: flex;
    justify-content: center;
    align-items: center;
}

.uc-swap-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--bg-muted);
    color: var(--ink);
    font-size: 1.2rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.15s ease;
}

.uc-swap-btn:hover {
    background: var(--surface);
    border-color: var(--primary, #1d4ed8);
    color: var(--primary, #1d4ed8);
    transform: rotate(180deg);
}

/* Result Card */
.uc-result-box {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 1rem 1.25rem;
    background: var(--bg-muted);
    border: 1px solid var(--border);
    border-radius: 6px;
    min-height: 80px;
}

.uc-result-value {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--primary, #1d4ed8);
    word-break: break-all;
}

.uc-formula-text {
    font-size: 0.85rem;
    color: var(--ink-2);
    margin-top: 0.35rem;
    font-family: ui-monospace, monospace;
}

/* Toolbar & Options */
.uc-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.75rem;
    padding: 0.85rem 1.15rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md, 8px);
}

.uc-options-group {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--ink-2);
}

/* Error Banner */
.uc-error-banner {
    padding: 0.75rem 1rem;
    background: #fef2f2;
    border: 1px solid #f87171;
    border-radius: var(--radius-md, 8px);
    color: #991b1b;
    font-size: 0.87rem;
}

/* Reference Table */
.uc-ref-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md, 8px);
    padding: 1.25rem 1.5rem;
}

.uc-ref-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--ink);
    margin: 0 0 0.85rem 0;
}

.uc-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
}

.uc-table td {
    padding: 0.55rem 0.75rem;
    border-bottom: 1px solid var(--border);
    color: var(--ink);
}

.uc-table tr:last-child td {
    border-bottom: none;
}

/* Toast */
.uc-toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--ink);
    color: var(--surface);
    padding: 0.65rem 1.15rem;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 500;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.2s ease, transform 0.2s ease;
    pointer-events: none;
    z-index: 9999;
}

.uc-toast.is-visible {
    opacity: 1;
    transform: translateY(0);
}