/* ============================================
   Bench & Diagnostics Tools — Stylesheet
   Theme-aware (dark/light), responsive, a11y
   ============================================ */

/* --- Tab Navigation --- */
.bench-tabs {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 2.5rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0;
}

.bench-tab {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    font-family: var(--font-heading);
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    position: relative;
    white-space: nowrap;
}

.bench-tab:hover {
    color: var(--accent);
}

.bench-tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.bench-tab svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

/* --- Tab Panel --- */
.bench-panel {
    display: none;
    animation: benchFadeIn 0.35s ease;
}

.bench-panel.active {
    display: block;
}

@keyframes benchFadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

/* --- Shared Tool Card --- */
.tool-card {
    background: var(--gradient-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: var(--gradient-accent);
    opacity: 0.5;
}

.tool-card + .tool-card {
    margin-top: 2rem;
}

.tool-card-title {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tool-card-desc {
    color: var(--text-secondary);
    font-size: 0.88rem;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

/* --- Mode Toggle (4-band / 5-band) --- */
.mode-toggle {
    display: inline-flex;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.mode-toggle-btn {
    padding: 0.5rem 1.1rem;
    font-family: var(--font-body);
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all var(--transition);
}

.mode-toggle-btn.active {
    background: var(--accent);
    color: var(--bg-primary);
}

.mode-toggle-btn:hover:not(.active) {
    color: var(--accent);
    background: var(--accent-glow);
}

/* --- Band Selector Grid --- */
.band-selectors {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.band-group {
    flex: 1;
    min-width: 120px;
}

.band-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 0.4rem;
}

.band-select {
    width: 100%;
    padding: 0.55rem 0.75rem;
    font-family: var(--font-body);
    font-size: 0.85rem;
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    transition: border-color var(--transition), box-shadow var(--transition);
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%235e5e78' viewBox='0 0 16 16'%3E%3Cpath d='M1.5 5.5l6.5 6.5 6.5-6.5'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.7rem center;
    padding-right: 2rem;
}

.band-select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

/* --- Resistor SVG Container --- */
.resistor-svg-wrap {
    display: flex;
    justify-content: center;
    margin-bottom: 1.5rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.resistor-svg-wrap svg {
    max-width: 100%;
    height: auto;
}

/* --- Result Display --- */
.result-display {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1rem;
}

.result-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    text-align: center;
}

.result-label {
    display: block;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 0.35rem;
}

.result-value {
    font-family: var(--font-mono);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--accent);
}

/* --- Capacitor Decoder --- */
.cap-input-row {
    display: flex;
    gap: 0.75rem;
    align-items: flex-end;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.cap-input-group {
    flex: 1;
    min-width: 160px;
}

.cap-input-group label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 0.4rem;
}

.cap-input {
    width: 100%;
    padding: 0.6rem 0.9rem;
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.cap-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.cap-decode-btn {
    padding: 0.6rem 1.25rem;
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--bg-primary);
    background: var(--accent);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.cap-decode-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px var(--accent-glow);
}

.cap-error {
    color: var(--error);
    font-size: 0.82rem;
    margin-top: 0.5rem;
    min-height: 1.2em;
}

/* --- RF Protocol Reference (Card Layout) --- */
.rf-controls {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
}

.rf-filter-input {
    width: 100%;
    max-width: 400px;
    padding: 0.6rem 1rem 0.6rem 2.5rem;
    font-family: var(--font-body);
    font-size: 0.88rem;
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: border-color var(--transition), box-shadow var(--transition);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%235e5e78' viewBox='0 0 24 24'%3E%3Ccircle cx='11' cy='11' r='8' fill='none' stroke='%235e5e78' stroke-width='2'/%3E%3Cpath d='m21 21-4.35-4.35' fill='none' stroke='%235e5e78' stroke-width='2'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: 0.75rem center;
}

.rf-filter-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.rf-category-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.rf-pill {
    padding: 0.3rem 0.75rem;
    font-family: var(--font-body);
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-muted);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 20px;
    cursor: pointer;
    transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
    white-space: nowrap;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.rf-pill:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.rf-pill.active {
    background: var(--accent);
    color: var(--bg-primary);
    border-color: var(--accent);
}

/* Card grid */
.rf-card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 0.85rem;
}

.rf-card {
    background: var(--gradient-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1.15rem;
    cursor: pointer;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.rf-card:hover {
    border-color: var(--accent);
    box-shadow: 0 2px 12px var(--accent-glow);
}

.rf-card.expanded {
    border-color: var(--accent);
}

.rf-card-header {
    display: flex;
    align-items: center;
    gap: 0.65rem;
}

.rf-card-name {
    font-family: var(--font-heading);
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
    min-width: 0;
}

.rf-card-freq {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 600;
    color: var(--accent);
    background: var(--accent-glow);
    padding: 0.18rem 0.55rem;
    border-radius: 12px;
    white-space: nowrap;
    flex-shrink: 0;
}

.rf-card-expand-icon {
    font-size: 0.65rem;
    color: var(--text-muted);
    transition: transform 0.2s ease;
    flex-shrink: 0;
    margin-left: auto;
}

.rf-card.expanded .rf-card-expand-icon {
    transform: rotate(90deg);
}

.rf-card-app {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.45;
}

/* Expanded detail area inside card */
.rf-card-details {
    display: none;
    margin-top: 0.5rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
}

.rf-card.expanded .rf-card-details {
    display: block;
}

.rf-detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.6rem 1rem;
}

.rf-detail-item {
    min-width: 0;
}

.rf-detail-item strong {
    display: block;
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 0.15rem;
    font-weight: 600;
}

.rf-detail-item span {
    color: var(--text-primary);
    font-size: 0.8rem;
    line-height: 1.45;
    word-break: break-word;
}

.rf-detail-tips {
    grid-column: 1 / -1;
}

.rf-card-count {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.rf-no-results {
    text-align: center;
    padding: 2.5rem 1rem;
    color: var(--text-muted);
    font-size: 0.88rem;
}

/* --- Mobile Responsive --- */
@media (max-width: 768px) {
    .bench-tabs {
        gap: 0;
        border-bottom: none;
        flex-direction: column;
        border: 1px solid var(--border);
        border-radius: var(--radius);
        overflow: hidden;
    }

    .bench-tab {
        border-bottom: 1px solid var(--border);
        border-bottom-width: 1px;
        justify-content: flex-start;
        padding: 0.85rem 1.25rem;
    }

    .bench-tab:last-child {
        border-bottom: none;
    }

    .bench-tab.active {
        background: var(--accent-glow);
        border-bottom-color: var(--border);
    }

    .tool-card {
        padding: 1.25rem;
    }

    .band-selectors {
        flex-direction: column;
        gap: 0.75rem;
    }

    .band-group {
        min-width: unset;
    }

    .result-display {
        grid-template-columns: 1fr 1fr;
    }

    .cap-input-row {
        flex-direction: column;
    }

    .rf-card-grid {
        grid-template-columns: 1fr;
    }

    .rf-detail-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .result-display {
        grid-template-columns: 1fr;
    }
}