* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Inherit body styles from common.css */

.container {
    max-width: 1400px;
    margin: 0 auto;
}

/* Inherit h1 styles from common.css */

.subtitle {
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 30px;
    font-size: 1rem;
}

/* Inherit card styles from common.css */

.card h2 {
    color: var(--accent-secondary);
    margin-bottom: 20px;
    font-size: 1.4rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.card h3 {
    color: var(--accent-secondary);
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.section {
    margin-bottom: 25px;
    padding: 20px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 12px;
}

.input-group {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
    flex-wrap: wrap;
    align-items: flex-end;
}

.input-field {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.input-field label {
    color: #ccd6f6;
    font-size: 0.9rem;
    font-weight: 500;
}

.input-field input,
.input-field select {
    padding: 12px 16px;
    border: 2px solid rgba(255, 255, 255, 0.15);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
    font-size: 1rem;
    width: 160px;
    transition: all 0.3s ease;
}

.input-field input:focus,
.input-field select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.3);
}

select option {
    background: #243b55;
    color: #fff;
}

/* Button styles inherited from common.css */


.solve-section {
    text-align: center;
    margin: 30px 0 10px 0;
}

.objective-row {
    display: flex;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
}

.obj-select {
    padding: 10px 15px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-sm);
    background: rgba(0, 0, 0, 0.2);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 500;
}

.obj-select:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(92, 131, 116, 0.2);
}

.obj-label {
    color: var(--accent-primary);
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.01em;
}

.objective-inputs {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
}

.var-input {
    display: flex;
    align-items: center;
    gap: 5px;
}

.var-input input {
    width: 70px;
    text-align: center;
    background: rgba(0, 0, 0, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.var-input input:focus {
    background: rgba(0, 0, 0, 0.25);
    border-color: var(--accent-primary);
}

.var-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.plus-sign {
    color: var(--text-muted);
    font-size: 1rem;
    font-weight: 400;
    margin: 0 4px;
}

.constraint-row {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.03);
    border-radius: var(--border-radius-sm);
    padding: 15px;
    margin-bottom: 10px;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.constraint-row:hover {
    background: rgba(255, 255, 255, 0.03);
    border-color: rgba(255, 255, 255, 0.06);
}

.constraint-row .var-input input {
    width: 65px;
}

.constraint-row select {
    padding: 8px 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(0, 0, 0, 0.2);
    color: var(--text-secondary);
}

.constraint-row .rhs-input {
    width: 80px;
    border-color: rgba(92, 131, 116, 0.3);
    color: var(--text-primary);
    font-weight: 600;
    background: rgba(0, 0, 0, 0.2);
}

.constraint-label {
    color: var(--viz-purple);
    font-weight: 500;
    font-size: 0.9rem;
    min-width: 30px;
}

.non-negativity {
    text-align: center;
    color: var(--text-muted);
    font-style: italic;
    font-size: 0.9rem;
}

.result-card {
    background: linear-gradient(135deg, rgba(74, 222, 128, 0.05), rgba(96, 165, 250, 0.05));
    border: 1px solid rgba(74, 222, 128, 0.1);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.method-info {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    margin-bottom: 25px;
}

.method-badge {
    padding: 10px 20px;
    border-radius: 25px;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    border: 2px solid rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.method-badge.normal {
    background: rgba(129, 178, 154, 0.3);
    border-color: #81b29a;
    color: #81b29a;
}

.method-badge.bigm {
    background: rgba(244, 63, 94, 0.2);
    border-color: rgba(244, 63, 94, 0.5);
    color: #f43f5e;
}

.method-badge.dual {
    background: rgba(96, 165, 250, 0.2);
    border-color: rgba(96, 165, 250, 0.5);
    color: #60a5fa;
}

.step-container {
    margin: 20px 0;
    padding: 25px;
    background: var(--glass-bg);
    border-radius: var(--border-radius);
    border: 1px solid var(--glass-border);
    border-left: 4px solid var(--accent-primary);
    box-shadow: none;
}

.step-container.optimal {
    border-left-color: var(--viz-success);
    background: linear-gradient(to right, rgba(74, 222, 128, 0.02), transparent);
}

.step-container.pivot {
    border-left-color: var(--viz-info);
}

.step-container.infeasible {
    border-left-color: var(--viz-error);
    background: linear-gradient(to right, rgba(244, 63, 94, 0.02), transparent);
}

.step-title {
    color: var(--light);
    font-weight: 600;
    margin-bottom: 15px;
    font-size: 1.1rem;
    letter-spacing: -0.01em;
}

.step-container.optimal .step-title {
    color: var(--viz-success);
}

.step-container.infeasible .step-title {
    color: var(--viz-error);
}

.tableau-container {
    overflow-x: auto;
    /* Fix for overlapping */
    width: 100%;
    /* Ensure full width usage */
    margin: 20px 0;
    border-radius: var(--border-radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding-bottom: 5px;
    /* Space for scrollbar */
}

.tableau {
    border-collapse: collapse;
    font-size: 0.9rem;
    min-width: 100%;
}

.tableau th {
    background: rgba(255, 255, 255, 0.03);
    padding: 12px 16px;
    color: var(--text-secondary);
    font-weight: 600;
    white-space: nowrap;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.tableau td {
    padding: 12px 16px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.03);
    white-space: nowrap;
    color: var(--text-secondary);
}

.tableau td.basic-var {
    background: rgba(168, 85, 247, 0.05);
    color: var(--viz-purple);
    font-weight: 600;
}

.tableau td.pivot-element {
    border: 3px solid #d4b94e;
    box-shadow: 0 0 15px rgba(212, 185, 78, 0.4);
    font-weight: 700;
    position: relative;
    z-index: 1;
}

.tableau td.pivot-col {
    background: rgba(107, 138, 173, 0.25);
    color: #6b8aad;
}

.tableau td.pivot-row {
    background: rgba(107, 138, 173, 0.25);
    color: #6b8aad;
}

.tableau td.negative {
    color: #c47a7a;
    background: rgba(196, 122, 122, 0.15);
}

.tableau td.ratio {
    color: var(--viz-warning);
    font-style: italic;
    opacity: 0.8;
}

.pivot-info {
    margin-top: 15px;
    padding: 12px;
    background: rgba(168, 85, 247, 0.1);
    border-radius: var(--border-radius-sm);
    font-size: 0.9rem;
    color: var(--light);
    border: 1px solid rgba(168, 85, 247, 0.15);
}

.pivot-info code {
    background: rgba(0, 0, 0, 0.2);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--viz-purple);
    font-family: 'Fira Code', monospace;
}

.sensitivity-section {
    margin-top: 30px;
    padding: 25px;
    background: var(--glass-bg);
    border-radius: var(--border-radius);
    border: 1px solid var(--glass-border);
}

.sensitivity-section h3 {
    color: var(--light);
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.sensitivity-table th {
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-secondary);
    text-align: left;
    font-weight: 600;
}

.sensitivity-table td {
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.final-result {
    text-align: center;
    padding: 35px;
    background: var(--glass-bg);
    border-radius: var(--border-radius);
    margin-top: 30px;
    border: 1px solid rgba(74, 222, 128, 0.15);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.final-result h3 {
    color: #DADD98;
    font-size: 1.8rem;
    margin-bottom: 25px;
    letter-spacing: -0.02em;
}

.final-result.infeasible h3 {
    color: var(--viz-error);
}

.final-result.unbounded h3 {
    color: var(--viz-warning);
}

.solution-values {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
    margin: 25px 0;
}

.solution-var {
    background: rgba(255, 255, 255, 0.03);
    padding: 15px 30px;
    border-radius: var(--border-radius-sm);
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.05);
    min-width: 120px;
}

.solution-var .var-name {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 5px;
}

.solution-var .var-value {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--light);
}

.optimal-value {
    font-size: 2.5rem;
    color: #DADD98;
    font-weight: 700;
    margin-top: 20px;
    letter-spacing: -0.03em;
}

#whatIfSection {
    margin-top: 30px;
    padding: 30px;
    background: rgba(96, 165, 250, 0.05);
    border-radius: var(--border-radius);
    border: 1px solid rgba(96, 165, 250, 0.1);
}

#whatIfSection h3 {
    color: var(--viz-info);
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.whatif-option {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    padding: 10px 20px;
    margin-bottom: 10px;
    display: inline-block;
    margin-right: 10px;
}

.whatif-option:hover {
    background: rgba(255, 255, 255, 0.1);
}

.whatif-options {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 20px;
}

.whatif-input-group {
    background: rgba(0, 0, 0, 0.15);
    padding: 25px;
    border-radius: var(--border-radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.05);
    margin-bottom: 20px;
}

.whatif-input-group label {
    color: var(--accent-secondary);
    font-size: 0.9rem;
    margin-right: 10px;
}

.whatif-input-group select,
.whatif-input-group input {
    padding: 10px 14px;
    border: 2px solid rgba(255, 255, 255, 0.15);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
    font-size: 1rem;
    margin-right: 15px;
}

.whatif-input-group select:focus,
.whatif-input-group input:focus {
    outline: none;
    border-color: var(--viz-purple);
}

.new-constraint-row {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 10px;
}

.new-constraint-row .coef-input {
    width: 60px;
}

.new-var-inputs {
    margin-top: 10px;
}

.var-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.var-row span {
    color: rgba(255, 255, 255, 0.8);
    min-width: 200px;
}

.var-row input {
    width: 80px;
}

.btn-analyze {
    background: linear-gradient(135deg, #E8B4B8, #D4A5A5);
    color: #5a3040;
    font-size: 1rem;
    padding: 12px 30px;
    margin-bottom: 20px;
}

.btn-analyze:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(200, 142, 167, 0.3);
}

.whatif-result-box {
    background: rgba(0, 0, 0, 0.25);
    padding: 20px;
    border-radius: 12px;
    border-left: 4px solid var(--viz-purple);
}

.whatif-result-box h4 {
    color: var(--viz-purple);
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.whatif-result-box p {
    margin: 8px 0;
    color: rgba(255, 255, 255, 0.85);
    line-height: 1.6;
}

.whatif-result-box .info {
    background: rgba(168, 85, 247, 0.15);
    padding: 10px 15px;
    border-radius: 8px;
    color: #a5b4fc;
}

.whatif-result-box .success {
    color: #00ff88;
    font-weight: 600;
}

.whatif-result-box .warning {
    color: #ff6b6b;
    font-weight: 600;
}

.whatif-result-box .action {
    background: rgba(255, 193, 7, 0.15);
    padding: 10px 15px;
    border-radius: 8px;
    color: #ffc107;
    margin-top: 10px;
}

.feasibility-check {
    margin-top: 15px;
    padding: 15px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
}

.hidden {
    display: none;
}


@media (max-width: 768px) {
    h1 {
        font-size: 1.8rem;
    }

    .input-group {
        flex-direction: column;
    }

    .input-field input,
    .input-field select {
        width: 100%;
    }

    .objective-row,
    .constraint-row {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* Light Mode Overrides for Simplex */
body.light-mode #whatIfSection {
    border: 2px solid #5C8374 !important;
    background: rgba(92, 131, 116, 0.1) !important;
}

body.light-mode .whatif-option {
    border: 2px solid #5C8374 !important;
    background: rgba(255, 255, 255, 0.5) !important;
    color: #183D3D !important;
    font-weight: 500;
}

body.light-mode .whatif-input-group {
    border: 2px solid #183D3D !important;
    background: rgba(255, 255, 255, 0.7) !important;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

body.light-mode .whatif-input-group label {
    color: #183D3D !important;
    font-weight: 600;
}

body.light-mode .whatif-input-group select,
body.light-mode .whatif-input-group input {
    border: 2px solid #5C8374 !important;
    color: #183D3D !important;
    background: #fff !important;
}

body.light-mode .whatif-result-box {
    border: 2px solid #5C8374 !important;
    border-left: 6px solid var(--viz-purple) !important;
    background: rgba(255, 255, 255, 0.8) !important;
}

body.light-mode .whatif-result-box h4 {
    color: #4a1d96 !important;
    /* Darker purple for visibility */
}

body.light-mode .whatif-result-box p {
    color: #183D3D !important;
}

body.light-mode .solution-var {
    border: 2px solid #183D3D !important;
    background: rgba(255, 255, 255, 0.8) !important;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

body.light-mode .solution-var .var-name {
    color: #183D3D !important;
    font-weight: 600;
}

body.light-mode .solution-var .var-value {
    color: #000 !important;
    font-weight: 700;
}