/* Conversor bidireccional */
.conv-bidir {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: end;
    gap: 1rem;
    margin-bottom: 1.2rem;
}

.conv-side {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.conv-side label {
    font-family: var(--font-primary);
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--text-color);
}

.conv-input-wrap {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.conv-number {
    border: 2px solid var(--border-color);
    border-radius: 10px;
    padding: 0.7rem 0.9rem;
    font-family: var(--font-primary);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary-color);
    width: 100%;
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition);
    background: #fff;
}

.conv-number:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.conv-select {
    appearance: none;
    border: 1.5px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem 2rem 0.5rem 0.8rem;
    font-family: var(--font-primary);
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--text-color);
    background: var(--bg-soft);
    cursor: pointer;
    outline: none;
    width: 100%;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%236b7280' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.7rem center;
    transition: border-color var(--transition);
}

.conv-select:focus {
    border-color: var(--secondary-color);
}

/* Botón intercambio */
.swap-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    background: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    color: var(--primary-color);
    transition: all var(--transition);
    flex-shrink: 0;
    margin-bottom: 0.5rem;
}

.swap-btn:hover {
    background: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
    transform: rotate(180deg);
}

/* Resultado grande */
.resultado-conv {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 14px;
    padding: 1.4rem 1.8rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1rem;
    position: relative;
    overflow: hidden;
}

.resultado-conv::before {
    content: '';
    position: absolute;
    top: -30px;
    right: -30px;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.06);
}

.res-conv-desde {
    font-family: var(--font-primary);
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.7);
}

.res-conv-desde strong {
    color: #fff;
    font-size: 1.1rem;
    display: block;
}

.res-conv-flecha {
    font-size: 1.5rem;
    color: rgba(255, 255, 255, 0.5);
}

.res-conv-hasta {
    font-family: var(--font-primary);
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.7);
    text-align: right;
}

.res-conv-hasta strong {
    color: #fff;
    font-size: 1.8rem;
    display: block;
    line-height: 1;
}

/* Conversiones rápidas (chips) */
.quick-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 1.2rem;
}

.quick-chip {
    padding: 0.3rem 0.75rem;
    border: 1.5px solid var(--border-color);
    border-radius: 50px;
    background: var(--bg-soft);
    font-family: var(--font-primary);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition);
}

.quick-chip:hover {
    background: var(--accent-color);
    color: #fff;
    border-color: var(--accent-color);
}

/* Tabla de conversión completa */
.conv-tabla {
    width: 100%;
    border-collapse: collapse;
}

.conv-tabla thead th {
    background: var(--primary-color);
    color: #fff;
    font-family: var(--font-primary);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.7rem 1rem;
    text-align: left;
}

.conv-tabla thead th:first-child {
    border-radius: 6px 0 0 0;
}

.conv-tabla thead th:last-child {
    border-radius: 0 6px 0 0;
    text-align: right;
}

.conv-tabla tbody tr {
    cursor: pointer;
    transition: background var(--transition);
}

.conv-tabla tbody tr:nth-child(even) {
    background: var(--bg-soft);
}

.conv-tabla tbody tr:hover {
    background: #dbeafe;
}

.conv-tabla tbody tr.fila-activa {
    background: #eff6ff;
    border-left: 3px solid var(--secondary-color);
}

.conv-tabla td {
    padding: 0.65rem 1rem;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

.conv-tabla td:last-child {
    text-align: right;
    font-family: var(--font-primary);
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--primary-color);
    font-variant-numeric: tabular-nums;
}

.unidad-nombre {
    font-family: var(--font-primary);
    font-weight: 700;
    font-size: 0.88rem;
    color: var(--text-color);
}

.unidad-simbolo {
    font-family: 'Courier New', monospace;
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 0.1rem;
}

.unidad-sistema {
    font-size: 0.68rem;
    padding: 0.1rem 0.45rem;
    border-radius: 50px;
    font-family: var(--font-primary);
    font-weight: 700;
}

.sis-metrico {
    background: #dbeafe;
    color: #1e40af;
}

.sis-imperial {
    background: #fef3c7;
    color: #92400e;
}

.sis-otro {
    background: #f3e8ff;
    color: #6b21a8;
}

/* Gráfico visual de escala */
.escala-items {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.escala-item {
    display: grid;
    grid-template-columns: 140px 1fr auto;
    align-items: center;
    gap: 0.8rem;
}

.escala-label {
    font-family: var(--font-primary);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-color);
    text-align: right;
}

.escala-barra-bg {
    height: 14px;
    border-radius: 50px;
    background: var(--border-color);
    overflow: hidden;
}

.escala-barra-fill {
    height: 100%;
    border-radius: 50px;
    transition: width 0.5s ease;
}

.escala-val {
    font-family: var(--font-primary);
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--primary-color);
    white-space: nowrap;
    min-width: 80px;
    text-align: right;
}

/* Referencias contextuales */
.referencias-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 0.6rem;
    margin-top: 0.5rem;
}

.ref-card {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.8rem;
    text-align: center;
    transition: box-shadow var(--transition);
}

.ref-card:hover {
    box-shadow: var(--shadow);
}

.ref-emoji {
    font-size: 1.5rem;
    display: block;
    margin-bottom: 0.3rem;
}

.ref-obj {
    font-size: 0.72rem;
    color: var(--text-muted);
    font-family: var(--font-primary);
}

.ref-peso {
    font-family: var(--font-primary);
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--primary-color);
}

.ref-equiv {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 0.1rem;
}

@media (max-width: 560px) {
    .conv-bidir {
        grid-template-columns: 1fr;
        gap: 0.7rem;
    }

    .swap-btn {
        margin: 0 auto;
    }

    .escala-item {
        grid-template-columns: 100px 1fr auto;
    }

    .escala-label {
        font-size: 0.72rem;
    }
}