/* Heat Exchanger Sizing Calculator Styles */
:root {
    --bg-primary: #F5F5F5;
    --panel-bg: #E0E0E0;
    --text-primary: #222222;
    --accent-primary: #4A90E2;
    --accent-secondary: #FF9500;
    --input-bg: #f9f9f9;
    --input-border: #333333;
    --border-radius: 4px;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
    --danger: #dc3545;
    --success: #28a745;
}

.heat-exchanger-calc-wrapper {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    padding: 20px;
    min-height: 100vh;
}

.colorblind-mode {
    --accent-primary: #000000;
    --accent-secondary: #666666;
    --input-border: #000000;
}

.heat-exchanger-calc-wrapper * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.app-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    max-width: 1400px;
    margin: 0 auto;
}

@media (min-width: 1024px) {
    .app-container {
        grid-template-columns: 1fr 1fr;
    }
}

.panel {
    background-color: var(--panel-bg);
    border-radius: 8px;
    padding: 25px;
    box-shadow: var(--shadow);
}

.panel-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.panel-title .colorblind-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    cursor: pointer;
    user-select: none;
}

.panel-title .colorblind-toggle input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.form-row {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-row label {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.form-row .unit-selector {
    display: flex;
    gap: 5px;
    font-size: 0.8rem;
}

.form-row .unit-selector button {
    padding: 2px 6px;
    border: 1px solid var(--input-border);
    background: var(--input-bg);
    cursor: pointer;
    font-size: 0.75rem;
    border-radius: 2px;
    color: #000000; /* FIX FOR ISSUE #2: Set unselected button text to black */
}

.form-row .unit-selector button.active {
    background-color: var(--accent-primary);
    color: white;
}

.input-description {
    font-size: 0.8rem;
    color: #666;
    font-style: italic;
    margin-top: 2px;
}

input, select {
    width: 100%;
    padding: 14px 15px !important; /* Increased padding for better visibility */
    border: 2px solid var(--input-border);
    border-radius: var(--border-radius);
    background-color: var(--input-bg);
    font-size: 1rem !important; /* Ensure text is visible */
    color: var(--text-primary);
    transition: border-color 0.3s;
    height: auto !important; /* FIX FOR ISSUE #1: Remove fixed height for dropdowns */
    min-height: 48px !important; /* FIX FOR ISSUE #1: Use min-height instead */
    line-height: 1.5 !important; /* FIX FOR ISSUE #1: Better line height for dropdowns */
    margin: 0 !important; /* Remove any default margins */
    box-sizing: border-box !important; /* Ensure consistent box model */
}

/* Specific fix for dropdowns - FIX FOR ISSUE #1 */
select {
    padding: 14px 30px 14px 15px !important; /* Space for dropdown arrow */
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-size: 16px;
}

/* Ensure dropdown text is fully visible - FIX FOR ISSUE #1 */
select option {
    padding: 12px 15px !important;
    font-size: 1rem !important;
    height: auto !important;
    min-height: 40px !important;
    line-height: 1.5 !important;
    white-space: normal !important; /* Allow text to wrap */
    display: block !important;
    background-color: var(--input-bg);
    color: var(--text-primary);
}

input:focus, select:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.primary-input {
    border-color: var(--accent-primary);
    border-width: 2px;
}

.secondary-input {
    border-color: #999;
    border-width: 1px;
}

.buttons-container {
    display: flex;
    gap: 15px;
    margin-top: 40px !important; /* Increased margin for better spacing */
    flex-wrap: wrap;
    clear: both; /* Ensure no floating elements interfere */
}

.button {
    padding: 14px 28px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    text-align: center;
    min-width: 140px;
}

.calculate-btn {
    background-color: var(--accent-primary);
    color: white;
}

.reset-btn {
    background-color: #666;
    color: white;
}

.export-btn {
    background-color: var(--accent-secondary);
    color: white;
}

.button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.button:active {
    transform: translateY(0);
}

/* ERROR CONTAINER - Moved to top of results panel */
#errorContainer {
    display: none;
    margin-bottom: 20px;
}

#errorContainer .dynamic-comment {
    background-color: #f8d7da;
    border-left: 4px solid var(--danger);
    color: #721c24;
    padding: 15px;
    border-radius: var(--border-radius);
}

.colorblind-mode #errorContainer .dynamic-comment {
    background-color: #f0f0f0;
    border-left: 4px solid #000000;
    color: #000000;
}

.results-section {
    margin-top: 30px;
}

.result-item {
    background-color: rgba(255, 255, 255, 0.7);
    border-radius: var(--border-radius);
    padding: 15px;
    margin-bottom: 15px;
    border-left: 4px solid var(--accent-primary);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.result-title {
    font-weight: 600;
    color: var(--text-primary);
}

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

.colorblind-mode .result-value {
    color: #000000;
}

.step-calculation {
    font-family: 'Courier New', monospace;
    background-color: rgba(0, 0, 0, 0.05);
    padding: 10px;
    border-radius: 4px;
    margin: 10px 0;
    font-size: 0.9rem;
    white-space: pre-wrap;
    word-break: break-all;
}

.dynamic-comment, .dynamic-analysis, .dynamic-recommendation {
    padding: 12px;
    margin: 12px 0;
    border-radius: var(--border-radius);
}

.dynamic-comment {
    background-color: #e3f2fd;
    border-left: 4px solid #2196f3;
}

.dynamic-analysis {
    background-color: #f3e5f5;
    border-left: 4px solid #9c27b0;
}

.dynamic-recommendation {
    background-color: #e8f5e8;
    border-left: 4px solid #4caf50;
}

.colorblind-mode .dynamic-comment {
    background-color: #f0f0f0;
    border-left: 4px solid #000000;
}

.colorblind-mode .dynamic-analysis {
    background-color: #e0e0e0;
    border-left: 4px solid #666666;
}

.colorblind-mode .dynamic-recommendation {
    background-color: #d0d0d0;
    border-left: 4px solid #333333;
}

.svg-container {
    width: 100%;
    height: 300px;
    background-color: white;
    border-radius: var(--border-radius);
    border: 1px solid #ddd;
    overflow: hidden;
    margin-top: 20px;
}

.trademark {
    position: relative;
    bottom: 10px;
    right: 10px;
    font-size: 0.75rem;
    color: #666;
    opacity: 0.7;
    z-index: 1000;
    text-align: right;
    margin-top: 20px;
}

.disclaimer {
    font-size: 0.8rem;
    color: #666;
    font-style: italic;
    margin-top: 30px;
    padding: 15px;
    background-color: rgba(255, 255, 255, 0.5);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--danger);
}

.svg-disclaimer {
    font-size: 0.7rem;
    text-align: center;
    color: #999;
    margin-top: 5px;
    font-style: italic;
}

.error-message {
    color: var(--danger);
    font-size: 0.9rem;
    margin-top: 5px;
    display: none;
}

.hidden {
    display: none;
}

@media (max-width: 768px) {
    .panel {
        padding: 15px;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .button {
        min-width: 100%;
    }
    
    .buttons-container {
        flex-direction: column;
    }
    
    .trademark {
        position: static;
        text-align: center;
        margin-top: 20px;
    }
    
    /* Ensure inputs are readable on mobile */
    input, select {
        font-size: 16px !important; /* Prevent iOS zoom on focus */
        padding: 12px 10px !important;
    }
}

.field-group {
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px solid rgba(0,0,0,0.1);
}

.field-group-title {
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--accent-primary);
    font-size: 1.1rem;
}

.colorblind-mode .field-group-title {
    color: #000000;
}

.type-specific-group {
    background-color: rgba(255, 255, 255, 0.3);
    padding: 15px;
    border-radius: var(--border-radius);
    margin-top: 10px;
    border-left: 3px solid var(--accent-secondary);
}

.fin-parameters, .plate-parameters, .spiral-parameters, .pche-parameters, .pfhe-parameters, .regenerative-parameters {
    display: none;
}

.input-with-unit {
    display: flex;
    gap: 10px;
}

.input-with-unit input {
    flex: 1;
}

.input-with-unit select {
    width: 80px;
    flex-shrink: 0;
}

.warning-banner {
    background-color: #fff3cd;
    border: 1px solid #ffc107;
    color: #856404;
    padding: 10px;
    border-radius: var(--border-radius);
    margin: 10px 0;
    font-size: 0.9rem;
}

.material-properties {
    background-color: rgba(255, 255, 255, 0.5);
    padding: 10px;
    border-radius: var(--border-radius);
    margin-top: 10px;
    border: 1px dashed #ccc;
}

.toggle-button {
    background: none;
    border: 1px solid var(--accent-primary);
    color: var(--accent-primary);
    padding: 5px 10px;
    border-radius: 3px;
    cursor: pointer;
    font-size: 0.85rem;
    margin-top: 5px;
}

.toggle-button:hover {
    background-color: rgba(74, 144, 226, 0.1);
}

/* Fix for input field text visibility */
input[type="number"], input[type="text"] {
    -webkit-appearance: none;
    -moz-appearance: textfield;
    appearance: textfield;
}

/* Remove number input arrows */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

/* Ensure proper spacing between form elements */
.form-row + .form-row {
    margin-top: 5px;
}

/* Prevent overlapping of elements */
.app-container > * {
    min-width: 0; /* Prevent grid blowout */
}

/* Ensure panels don't collapse */
.panel > *:last-child {
    margin-bottom: 0;
}