/**
 * Frequenz-Rechner Tool Styles
 * Nutzt CSS-Variablen aus style.css für Konsistenz mit dem Dezibel-Rechner
 */

.fr-rechner {
    margin: 2rem 0;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.fr-modul {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
}

.fr-modul.fr-flagship {
    border-color: var(--primary);
    box-shadow: 0 2px 12px rgba(37, 99, 235, 0.08);
}

.fr-modul h3 {
    margin: 0 0 0.75rem 0;
    font-size: var(--h3-size);
    color: var(--text);
}

.fr-hint {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin: 0 0 1rem 0;
}

/* Medium-Umschalter (Funk / Schall) */
.fr-medium {
    display: inline-flex;
    gap: 0.25rem;
    background: var(--bg-hover, #f8f9fa);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.25rem;
    margin-bottom: 1.25rem;
    flex-wrap: wrap;
}

.fr-medium-btn {
    background: none;
    border: none;
    border-radius: calc(var(--radius) - 2px);
    padding: 0.4rem 0.9rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
}

.fr-medium-btn.active {
    background: var(--primary);
    color: #fff;
}

/* Eingabefelder */
.fr-triple {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1rem;
}

.fr-field {
    display: flex;
    flex-direction: column;
}

.fr-field label {
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.35rem;
    color: var(--text-muted);
}

.fr-input-unit {
    display: flex;
    gap: 0.4rem;
}

.fr-input-unit input {
    flex: 1;
    min-width: 0;
    padding: 0.6rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
    background: #fff;
    color: var(--text);
    transition: border-color 0.2s;
}

.fr-input-unit select {
    padding: 0.6rem 0.5rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.95rem;
    background: #fff;
    color: var(--text);
    cursor: pointer;
}

.fr-input-unit input:focus,
.fr-input-unit select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.1);
}

/* Band-Badge */
.fr-band {
    min-height: 0;
    margin-bottom: 0.5rem;
}

.fr-band-badge {
    display: inline-block;
    background: #ecfdf5;
    color: #047857;
    border: 1px solid #6ee7b7;
    border-radius: 999px;
    padding: 0.2rem 0.8rem;
    font-size: 0.85rem;
    font-weight: 600;
}

/* Ergebnis */
.fr-result {
    background: var(--bg-highlight, #f0f7ff);
    border: 1px solid var(--primary);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    margin-top: 0.5rem;
}

.fr-result-placeholder {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.fr-result-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.35rem;
}

.fr-result-value {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--primary);
}

.fr-result-detail {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.35rem;
}

.fr-result-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
}

.fr-result-item {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.7rem 0.85rem;
}

.fr-result-key {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.fr-result-val {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary);
}

.fr-result-sub {
    font-size: 0.78rem;
    color: var(--text-muted);
}

/* Presets */
.fr-presets {
    margin-top: 1rem;
}

.fr-preset-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.fr-preset-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.fr-preset-buttons button {
    background: var(--bg-hover, #f8f9fa);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.35rem 0.7rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text);
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.fr-preset-buttons button:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.fr-preset-buttons button.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

/* Formel-Fusszeile */
.fr-formel {
    background: var(--bg-hover, #f8f9fa);
    border-radius: var(--radius);
    padding: 0.6rem 0.85rem;
    margin-top: 0.85rem;
    font-size: 0.9rem;
    color: var(--text-muted);
    text-align: center;
}

/* Einheiten-Grid (Modul 2) */
.fr-unit-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.5rem;
    margin-top: 0.85rem;
}

.fr-unit-cell {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    background: var(--bg-highlight, #f0f7ff);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.6rem 0.5rem;
    text-align: center;
}

.fr-unit-name {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
}

.fr-unit-value {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--primary);
    word-break: break-all;
}

/* Ein-/Zweispaltige Eingabezeilen (Module 3-5) */
.fr-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: flex-end;
    margin-bottom: 0.5rem;
}

.fr-row .fr-field {
    flex: 1;
    min-width: 150px;
}

/* Responsive */
@media (max-width: 768px) {
    .fr-triple {
        grid-template-columns: 1fr;
    }
    .fr-result-grid {
        grid-template-columns: 1fr;
    }
    .fr-unit-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .fr-modul {
        padding: 1rem;
    }
    .fr-modul h3 {
        font-size: 1.1rem;
    }
    .fr-result-value {
        font-size: 1.15rem;
    }
}