/* ========================================
   THERMODYNAMICS CALCULATOR STYLES
   Red/Orange Heat Theme
======================================== */

.thermo-container {
    width: 100%;
    max-width: 580px;
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: visible;
    transition: max-width var(--transition-normal);
}

.category-selector {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--gap-xs);
    padding: var(--gap-md);
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    border-bottom: 2px solid #f87171;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.category-btn {
    padding: 0.65rem 0.5rem;
    border: none;
    background: white;
    color: #991b1b;
    font-weight: 600;
    font-size: 0.7rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
    white-space: nowrap;
    touch-action: manipulation;
    position: relative;
    overflow: hidden;
}

.category-btn::before {
    content: '🔥';
    position: absolute;
    top: 50%;
    left: -100%;
    transform: translateY(-50%);
    font-size: 2rem;
    opacity: 0.15;
    transition: left 0.5s;
}

.category-btn:hover::before {
    left: 100%;
}

.category-btn:hover {
    background: #fef2f2;
    transform: translateY(-1px);
    border: 2px solid #f87171;
}

.category-btn.active {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: white;
    box-shadow: 0 0 15px rgba(239, 68, 68, 0.5);
}

.calculator-selection {
    padding: var(--gap-md);
    background: linear-gradient(135deg, #ffedd5 0%, #fed7aa 100%);
    border-bottom: 2px solid #fb923c;
}

.selection-label {
    display: block;
    font-size: 0.7rem;
    font-weight: 700;
    color: #9a3412;
    margin-bottom: var(--gap-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.calculator-select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #fb923c;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    color: #1e293b;
    background: white;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.calculator-select:focus {
    outline: none;
    border-color: #ef4444;
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.calculator-interface {
    padding: var(--gap-md);
}

.calculator-header {
    margin-bottom: var(--gap-md);
    padding-bottom: var(--gap-sm);
    border-bottom: 2px solid #f1f5f9;
}

.calculator-header h2 {
    font-size: 1.125rem;
    font-weight: 700;
    color: #1e293b;
    margin: 0;
}

.formula-display {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    padding: var(--gap-md);
    border-radius: var(--radius-lg);
    margin-bottom: var(--gap-md);
    border: 2px solid #f87171;
    position: relative;
    overflow: hidden;
}

.formula-display::after {
    content: 'ΔQ';
    position: absolute;
    top: -5px;
    right: 5px;
    font-size: 3rem;
    opacity: 0.1;
    color: #ef4444;
    font-family: 'Courier New', monospace;
    font-weight: 900;
}

.formula-label {
    font-size: 0.7rem;
    font-weight: 700;
    color: #991b1b;
    margin-bottom: var(--gap-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.formula-equation {
    font-size: 1.125rem;
    color: #7f1d1d;
    font-family: 'Courier New', monospace;
    font-weight: 600;
    word-wrap: break-word;
    position: relative;
    z-index: 1;
}

.input-fields {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--gap-md);
    margin-bottom: var(--gap-md);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--gap-xs);
}

.input-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--secondary-color);
    display: flex;
    align-items: center;
    gap: var(--gap-xs);
}

.input-symbol {
    font-family: 'Courier New', monospace;
    color: #ef4444;
    font-weight: 700;
}

.input-wrapper {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--gap-xs);
}

.thermo-input {
    padding: 0.75rem;
    border: 2px solid #e2e8f0;
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    font-weight: 500;
    color: #1e293b;
    background: white;
    transition: all var(--transition-fast);
}

.thermo-input:focus {
    outline: none;
    border-color: #ef4444;
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.input-unit {
    padding: 0.75rem;
    background: #fef2f2;
    border: 2px solid #fca5a5;
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    font-weight: 600;
    color: #991b1b;
    min-width: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.calculate-btn {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--gap-sm);
    margin-bottom: var(--gap-md);
    position: relative;
    overflow: hidden;
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(239, 68, 68, 0.6);
    background: linear-gradient(135deg, #dc2626, #b91c1c);
}

.calculate-btn:active {
    transform: translateY(0);
}

.result-display {
    background: linear-gradient(135deg, #ffedd5 0%, #fed7aa 100%);
    padding: var(--gap-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--gap-md);
    border: 2px solid #fb923c;
    text-align: center;
    box-shadow: 0 0 20px rgba(251, 146, 60, 0.3);
}

.result-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: #9a3412;
    margin-bottom: var(--gap-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.result-value {
    font-size: 2rem;
    font-weight: 700;
    color: #c2410c;
    font-family: 'Courier New', monospace;
    margin-bottom: var(--gap-xs);
    word-wrap: break-word;
}

.result-unit {
    font-size: 1rem;
    font-weight: 600;
    color: #9a3412;
}

.explanation-section {
    background: #f8fafc;
    padding: var(--gap-md);
    border-radius: var(--radius-lg);
    margin-bottom: var(--gap-md);
    border: 2px solid #e2e8f0;
}

.explanation-section h3 {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin: 0 0 var(--gap-sm) 0;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.explanation-section p {
    font-size: 0.8125rem;
    line-height: 1.6;
    color: #475569;
    margin: 0;
}

.quick-reference {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    padding: var(--gap-md);
    border-radius: var(--radius-lg);
    border: 2px solid #f87171;
    margin-bottom: var(--gap-md);
}

.quick-reference h3 {
    font-size: 0.75rem;
    font-weight: 700;
    color: #991b1b;
    margin: 0 0 var(--gap-sm) 0;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.reference-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--gap-xs);
}

.reference-item {
    background: white;
    padding: var(--gap-sm);
    border-radius: var(--radius-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    border: 2px solid #fecaca;
    transition: all var(--transition-fast);
}

.reference-item:hover {
    border-color: #ef4444;
    transform: translateX(4px);
}

.ref-name {
    color: var(--secondary-color);
    font-weight: 600;
}

.ref-value {
    color: #dc2626;
    font-weight: 700;
    font-family: 'Courier New', monospace;
}

.constants-reference {
    background: linear-gradient(135deg, #ffedd5 0%, #fed7aa 100%);
    padding: var(--gap-md);
    border-radius: var(--radius-lg);
    border: 2px solid #fb923c;
}

.constants-reference h3 {
    font-size: 0.75rem;
    font-weight: 700;
    color: #9a3412;
    margin: 0 0 var(--gap-sm) 0;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.constants-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--gap-xs);
}

.constant-item {
    background: white;
    padding: var(--gap-sm);
    border-radius: var(--radius-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    border: 1px solid #fed7aa;
}

.constant-name {
    color: var(--secondary-color);
    font-weight: 500;
}

.constant-value {
    color: #c2410c;
    font-weight: 700;
    font-family: 'Courier New', monospace;
}

@media (min-width: 576px) {
    .thermo-container {
        max-width: 600px;
    }

    .category-selector {
        grid-template-columns: repeat(3, 1fr);
    }

    .category-btn {
        font-size: 0.75rem;
        padding: 0.75rem 0.5rem;
    }

    .input-fields {
        grid-template-columns: repeat(2, 1fr);
    }

    .reference-grid,
    .constants-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 768px) {
    .thermo-container {
        max-width: 640px;
    }

    .category-selector {
        grid-template-columns: repeat(4, 1fr);
    }

    .formula-equation {
        font-size: 1.25rem;
    }

    .result-value {
        font-size: 2.5rem;
    }
}

@media (min-width: 1024px) {
    .thermo-container {
        max-width: 680px;
    }
}

@media (min-width: 1280px) {
    .thermo-container {
        max-width: 720px;
    }
}

@media print {

    .category-selector,
    .calculate-btn,
    .quick-reference,
    .constants-reference {
        display: none;
    }

    .thermo-container {
        box-shadow: none;
    }
}