/* ============================================
    Controls Panel
    ============================================ */
.section {
    margin-bottom: 20px;
}

.section:last-child {
    margin-bottom: 0;
}

.section-header {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

/* Input Mode Toggle */
.mode-toggle {
    display: flex;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    flex-wrap: wrap;
}

.mode-toggle button {
    flex: 1;
    min-width: 80px;
    padding: 10px 8px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.mode-toggle button:hover {
    color: var(--text-primary);
    background: var(--bg-input);
}

.mode-toggle button.active {
    background: var(--accent-primary);
    color: #000;
    font-weight: 600;
}

/* Input Grid */
.input-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
}

.field {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.field label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.field input,
.field select {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px 12px;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
    outline: none;
    transition: border-color 0.2s;
}

.field input:focus,
.field select:focus {
    border-color: var(--accent-primary);
}

.field input::placeholder {
    color: var(--text-muted);
}

.altitude-helper {
    margin-top: 8px;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
}

.unit-toggle {
    display: flex;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}

.unit-toggle button {
    flex: 1;
    padding: 8px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    cursor: pointer;
    transition: all 0.15s;
}

.unit-toggle button:hover {
    color: var(--text-primary);
}

.unit-toggle button.active {
    background: var(--accent-primary);
    color: #000;
    font-weight: 600;
}

.process-toolbar {
    margin-top: 12px;
}

.process-state-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
    margin-top: 12px;
}

.process-card,
.process-delta-card,
.process-output {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px;
}

.process-card-title {
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 6px;
}

.process-card-body,
.process-delta-card,
.process-output {
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.72rem;
    line-height: 1.45;
}

.process-card-body strong,
.process-delta-card strong,
.process-output strong {
    color: var(--text-primary);
    font-weight: 600;
}

.process-delta-card,
.process-output {
    margin-top: 10px;
}

.process-output.warn {
    border-color: var(--accent-warning);
    color: var(--accent-warning);
}

.process-input-grid {
    margin-top: 10px;
}

.field[hidden] {
    display: none;
}

/* Values Card */
.values-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
}

.values-header {
    padding: 12px 16px;
    background: var(--bg-input);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    font-weight: 600;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-success);
}

.status-dot.warn {
    background: var(--accent-warning);
}

.values-body {
    padding: 12px 16px;
}

.value-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

.value-row:last-child {
    border-bottom: none;
}

.value-name {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.value-number {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent-primary);
}

.value-number.muted {
    color: var(--text-muted);
    font-weight: 400;
    font-size: 0.75rem;
}

.value-sub {
    font-size: 0.65rem;
    color: var(--text-muted);
}

/* ============================================
    Chart Overlays Toggle
    ============================================ */
.toggle-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.toggle-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.15s;
}

.toggle-item:hover {
    border-color: var(--accent-primary);
}

.toggle-item input[type="checkbox"] {
    display: none;
}

.toggle-box {
    width: 16px;
    height: 16px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
    flex-shrink: 0;
}

.toggle-item input:checked + .toggle-box {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

.toggle-box svg {
    width: 10px;
    height: 10px;
    stroke: #000;
    stroke-width: 3;
    opacity: 0;
}

.toggle-item input:checked + .toggle-box svg {
    opacity: 1;
}

.toggle-label {
    font-size: 0.7rem;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
}

/* ============================================
    Foldable Calculation Details
    ============================================ */
.foldable-header {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 14px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.foldable-header:hover {
    border-color: var(--accent-primary);
    background: var(--bg-input);
}

.foldable-header.active {
    border-radius: 8px 8px 0 0;
    border-bottom-color: transparent;
}

.foldable-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
}

.foldable-title svg {
    width: 16px;
    height: 16px;
    stroke: var(--accent-primary);
}

.foldable-chevron {
    width: 16px;
    height: 16px;
    stroke: var(--text-muted);
    transition: transform 0.2s;
}

.foldable-header.active .foldable-chevron {
    transform: rotate(180deg);
}

.foldable-content {
    display: none;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-top: none;
    border-radius: 0 0 8px 8px;
    padding: 16px;
    max-height: 400px;
    overflow-y: auto;
}

.foldable-content.active {
    display: block;
}

.calc-section {
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.calc-section:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.calc-header {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.625rem;
    font-weight: 600;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 8px;
}

.calc-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 4px 0;
    font-size: 0.75rem;
}

.calc-label {
    color: var(--text-secondary);
}

.calc-value {
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-primary);
    font-weight: 500;
}

.calc-value.calc-small {
    font-size: 0.6875rem;
    color: var(--text-muted);
    font-weight: 400;
}

/* Calculation Error Message */
.calculation-error {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    margin-bottom: 16px;
    background: var(--accent-error-dim);
    border: 1px solid var(--accent-error);
    border-radius: 8px;
    color: var(--accent-error);
    font-size: 0.875rem;
}

.calculation-error svg {
    flex-shrink: 0;
}

.calculation-error span {
    flex: 1;
}

.calc-value.calc-result {
    color: var(--accent-primary);
    font-size: 0.875rem;
    font-weight: 600;
}

.calc-value.calc-success {
    color: var(--accent-success);
}

.calc-equation {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-left: 3px solid var(--accent-primary);
    border-radius: 6px;
    padding: 12px 14px;
}

.eq-name {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6875rem;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.eq-formula {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8125rem;
    color: var(--text-primary);
}

.calc-iterations {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6875rem;
    background: var(--bg-input);
    border-radius: 6px;
    padding: 10px 12px;
    max-height: 120px;
    overflow-y: auto;
}

.calc-iter-row {
    display: flex;
    justify-content: space-between;
    padding: 2px 0;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
}

.calc-iter-row:last-child {
    border-bottom: none;
    color: var(--accent-success);
    font-weight: 500;
}

.calc-warning {
    background: var(--accent-warning-dim);
    border: 1px solid rgba(234, 179, 8, 0.3);
    border-radius: 6px;
    padding: 10px 12px;
    font-size: 0.75rem;
    color: var(--accent-warning);
}

/* Nested Foldable */
.nested-foldable-header {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 12px;
    margin-top: 10px;
    background: var(--bg-input);
    border: 1px dashed var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.6875rem;
    color: var(--text-secondary);
}

.nested-foldable-header:hover {
    border-color: var(--accent-info);
    color: var(--accent-info);
    background: var(--accent-info-dim);
}

.nested-foldable-header.active {
    border-style: solid;
    border-color: var(--accent-info);
    border-radius: 6px 6px 0 0;
    border-bottom: none;
    color: var(--accent-info);
}

.nested-chevron {
    width: 14px;
    height: 14px;
    transition: transform 0.2s;
}

.nested-foldable-header.active .nested-chevron {
    transform: rotate(180deg);
}

.nested-foldable-content {
    display: none;
    background: var(--bg-input);
    border: 1px solid var(--accent-info);
    border-top: none;
    border-radius: 0 0 6px 6px;
    padding: 14px;
}

.nested-foldable-content.active {
    display: block;
}

/* Steps Container */
.steps-container {
    font-size: 0.75rem;
}

.step-group {
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px dashed var(--border-color);
}

.step-group:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.step-group-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.625rem;
    font-weight: 600;
    color: var(--accent-info);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
}

.step-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 8px;
    padding: 8px 10px;
    background: var(--bg-secondary);
    border-radius: 4px;
    border-left: 2px solid var(--border-color);
}

.step-item.highlight {
    border-left-color: var(--accent-primary);
    background: var(--accent-primary-dim);
}

.step-item.result {
    border-left-color: var(--accent-success);
    background: var(--accent-success-dim);
}

.step-num {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.625rem;
    font-weight: 700;
    color: var(--text-muted);
    min-width: 20px;
}

.step-content {
    flex: 1;
}

.step-desc {
    color: var(--text-secondary);
    margin-bottom: 4px;
    line-height: 1.4;
}

.step-math {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--text-primary);
    background: var(--bg-primary);
    padding: 6px 10px;
    border-radius: 4px;
    overflow-x: auto;
    white-space: nowrap;
}