/* ───── Unit Converter ───── */
.uc-container { max-width: 820px; margin: 0 auto; }
.uc-wrapper { display: flex; flex-direction: column; gap: 1.2rem; }

/* Category Selector */
.uc-cat-row {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}
.uc-cat-row label {
    font-size: 0.74rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
    white-space: nowrap;
}
.uc-cat-select {
    flex: 1;
    padding: 0.6rem 0.85rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-glass);
    color: var(--text);
    font-family: var(--font);
    font-size: 0.9rem;
    cursor: pointer;
    backdrop-filter: blur(4px);
    transition: border-color 0.15s;
}
.uc-cat-select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(255,107,74,0.12); }

/* Input Card */
.uc-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: 16px;
    padding: 1.5rem;
    backdrop-filter: blur(8px);
}
.uc-input-row {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 0.8rem;
    align-items: end;
    margin-bottom: 1rem;
}
.uc-input-group { display: flex; flex-direction: column; gap: 0.35rem; }
.uc-input-group label {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
}
.uc-input-group select {
    padding: 0.65rem 0.8rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    font-size: 0.88rem;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L5 5L9 1' stroke='%23666' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 30px;
    transition: border-color 0.15s;
}
.uc-input-group select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(255,107,74,0.12); }
.uc-input-group input {
    padding: 0.7rem 0.85rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    font-size: 1rem;
    transition: border-color 0.15s;
}
.uc-input-group input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(255,107,74,0.12); }
.uc-input-group input[aria-invalid="true"] { border-color: #e74c3c; }

.uc-swap-btn {
    width: 40px; height: 40px;
    border: 2px solid var(--border);
    border-radius: 50%;
    background: var(--bg-glass);
    color: var(--text-secondary);
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 0.35rem;
    backdrop-filter: blur(4px);
    flex-shrink: 0;
}
.uc-swap-btn:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-light); transform: rotate(180deg); }
.uc-swap-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* Buttons */
.uc-btn-convert {
    width: 100%;
    padding: 0.8rem 1.5rem;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.15s;
}
.uc-btn-convert:hover:not(:disabled) { transform: translateY(-1px); box-shadow: 0 4px 14px rgba(255,107,74,0.3); }
.uc-btn-convert:disabled { opacity: 0.5; cursor: not-allowed; }
.uc-btn-secondary-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.6rem;
    margin-top: 0.6rem;
}
.uc-btn-secondary {
    padding: 0.65rem 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s;
}
.uc-btn-secondary:hover { background: var(--border); border-color: var(--accent); color: var(--accent); }

/* Quick values */
.uc-quick-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.6rem;
    margin-bottom: 0.6rem;
}
.uc-quick-chip {
    padding: 0.35rem 0.7rem;
    border: 1px solid var(--border);
    border-radius: 20px;
    background: var(--bg);
    color: var(--text-secondary);
    font-family: var(--font);
    font-size: 0.72rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s;
}
.uc-quick-chip:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-light); }

/* Error */
.uc-error {
    font-size: 0.82rem;
    color: #e74c3c;
    min-height: 1.2em;
    margin-top: 0.3rem;
    display: none;
}

/* Processing */
.uc-processing {
    display: none;
    text-align: center;
    padding: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-style: italic;
}
.uc-processing.active { display: block; }

/* Results */
.uc-results {
    display: none;
}
.uc-results.show { display: block; }
.uc-results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    margin-bottom: 1rem;
}
.uc-result-item {
    text-align: center;
    padding: 1.25rem 0.8rem;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--accent-light), transparent 70%);
    border: 1px solid var(--border-glass);
    transition: transform 0.3s cubic-bezier(0.16,1,0.3,1);
}
.uc-result-item:hover { transform: translateY(-2px); }
.uc-result-item.uc-result-main {
    grid-column: 1 / -1;
    background: linear-gradient(135deg, rgba(255,107,74,0.18), transparent 80%);
    padding: 1.8rem 1rem;
}
.uc-result-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
    word-break: break-all;
    line-height: 1.3;
}
.uc-result-value.mono {
    font-family: 'SF Mono','Cascadia Code','Fira Code',monospace;
    font-size: 0.95rem;
}
.uc-result-main .uc-result-value { font-size: 2.2rem; }
.uc-result-label {
    font-size: 0.68rem;
    color: var(--text-tertiary);
    margin-top: 4px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Formula */
.uc-formula {
    padding: 0.75rem 1rem;
    background: var(--bg);
    border: 1px solid var(--border-glass);
    border-radius: 10px;
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-family: 'SF Mono','Cascadia Code','Fira Code',monospace;
}
.uc-formula strong { color: var(--accent); }

/* Popular conversions table */
.uc-popular {
    margin-top: 1rem;
    padding: 0;
    list-style: none;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.4rem;
}
.uc-popular li {
    padding: 0.5rem 0.7rem;
    background: var(--bg);
    border-radius: 8px;
    font-size: 0.78rem;
    color: var(--text-secondary);
    font-family: 'SF Mono','Cascadia Code','Fira Code',monospace;
}

/* Toast */
.uc-toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent);
    color: #fff;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    z-index: 9999;
    font-size: 0.9rem;
    font-weight: 600;
    display: none;
}

/* Mobile */
@media (max-width: 600px) {
    .uc-input-row { grid-template-columns: 1fr; gap: 0.6rem; }
    .uc-swap-btn { margin: 0 auto; transform: rotate(90deg); }
    .uc-swap-btn:hover { transform: rotate(270deg); }
    .uc-results-grid { grid-template-columns: 1fr; }
    .uc-card { padding: 1rem; }
    .uc-popular { grid-template-columns: 1fr; }
}