* {
    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 */

/* Branch and Bound Specific Styles - Minimalist */

.subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 30px;
    font-size: 1rem;
    letter-spacing: 0.02em;
}

/* Inherit section/card styles from common.css */

.input-group {
    display: flex;
    gap: 20px;
    margin-bottom: 25px;
    flex-wrap: wrap;
    align-items: flex-end;
}

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

.input-field label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.input-field input,
.input-field select {
    padding: 12px 16px;
    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: 1rem;
    width: 160px;
    transition: var(--transition-fast);
}

.input-field input:focus,
.input-field select:focus {
    border-color: var(--viz-purple);
    box-shadow: 0 0 0 3px rgba(168, 85, 247, 0.1);
}

select option {
    background: var(--bg-dark);
    color: var(--text-primary);
}

.solve-section {
    text-align: center;
    margin: 35px 0 15px 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-label {
    color: var(--viz-purple);
    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;
    padding: 10px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--border-radius-sm);
    background: rgba(0, 0, 0, 0.15);
    color: var(--text-primary);
    font-size: 1rem;
    text-align: center;
}

.var-input input:focus {
    background: rgba(0, 0, 0, 0.25);
    border-color: var(--viz-purple);
    box-shadow: none;
}

.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 {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    flex-wrap: wrap;
    padding: 15px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.03);
    border-radius: var(--border-radius-sm);
    transition: var(--transition-fast);
}

.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);
    font-size: 0.9rem;
}

.constraint-row .rhs-input {
    width: 80px;
    padding: 10px;
    border: 1px solid rgba(74, 222, 128, 0.2);
    border-radius: var(--border-radius-sm);
    background: rgba(74, 222, 128, 0.05);
    color: var(--viz-success);
    font-size: 1rem;
    text-align: center;
    font-weight: 600;
}

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

.integer-vars {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    margin-top: 10px;
}

.integer-checkbox {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.03);
    padding: 8px 16px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-fast);
}

.integer-checkbox:hover {
    background: rgba(255, 255, 255, 0.08);
}

.integer-checkbox input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--viz-purple);
}

.non-negativity {
    text-align: center;
    color: var(--text-muted);
    font-style: italic;
    font-size: 0.9rem;
    margin-top: 15px;
}

.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, 0.15);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.tree-container {
    padding: 15px 0;
    overflow-x: auto;
}

.tree-node {
    margin: 10px 0;
    position: relative;
    padding-left: 10px;
}

.tree-connector {
    display: flex;
    align-items: center;
    margin-bottom: 8px;
    padding-left: 5px;
}

.connector-line {
    width: 30px;
    height: 2px;
    background: linear-gradient(90deg, #e94560, #ff6b6b);
    margin-right: 10px;
    opacity: 0.6;
}

.connector-branch {
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 0.85rem;
    font-weight: 500;
}

.left-branch {
    background: rgba(0, 217, 255, 0.1);
    color: var(--viz-info);
    border: 1px solid rgba(0, 217, 255, 0.2);
}

.right-branch {
    background: rgba(244, 63, 94, 0.1);
    color: var(--viz-error);
    border: 1px solid rgba(244, 63, 94, 0.2);
}

.node-box {
    background: var(--glass-bg);
    border-radius: var(--border-radius-sm);
    padding: 15px;
    border: 1px solid var(--glass-border);
    border-left: 4px solid var(--viz-purple);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    transition: var(--transition-fast);
    min-width: 200px;
}

.node-box:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    border-color: rgba(255, 255, 255, 0.1);
}

.tree-node.branched .node-box {
    border-left-color: var(--viz-purple);
}

.tree-node.integer .node-box {
    border-left-color: var(--viz-info);
    background: rgba(34, 211, 238, 0.05);
}

.tree-node.pruned .node-box {
    border-left-color: var(--text-muted);
    opacity: 0.7;
}

.tree-node.infeasible .node-box {
    border-left-color: var(--viz-error);
    opacity: 0.8;
}

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

.node-icon {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.node-title {
    color: var(--light);
    font-weight: 600;
    font-size: 1rem;
    flex-grow: 1;
}

.tree-node.integer .node-title {
    color: var(--viz-info);
}

.node-status {
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.status-active {
    background: rgba(244, 63, 94, 0.1);
    color: var(--viz-error);
    border: 1px solid rgba(244, 63, 94, 0.2);
}

.status-pruned {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.status-integer {
    background: rgba(34, 211, 238, 0.1);
    color: var(--viz-info);
    border: 1px solid rgba(34, 211, 238, 0.2);
}

.status-infeasible {
    background: rgba(244, 63, 94, 0.1);
    color: var(--viz-error);
    border: 1px solid rgba(244, 63, 94, 0.2);
}

.node-details {
    margin-top: 10px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.node-details div {
    display: flex;
    justify-content: space-between;
    margin-bottom: 4px;
}

.node-details strong {
    color: var(--viz-purple);
}

.best-solution-highlight {
    border: 2px solid var(--viz-success) !important;
    background: rgba(74, 222, 128, 0.05) !important;
    box-shadow: 0 0 20px rgba(74, 222, 128, 0.1) !important;
}

.status-integer {
    background: rgba(0, 217, 255, 0.3);
    color: #00d9ff;
}

.status-infeasible {
    background: rgba(255, 107, 107, 0.3);
    color: #ff6b6b;
}

.node-body {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.85);
}

.node-message {
    margin: 5px 0;
    font-style: italic;
}

.solution-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin: 8px 0;
}

.sol-var {
    background: rgba(255, 255, 255, 0.1);
    padding: 5px 12px;
    border-radius: 6px;
    font-size: 0.9rem;
}

.sol-var.fractional {
    background: rgba(255, 107, 107, 0.25);
    color: #ff6b6b;
    border: 1px solid rgba(255, 107, 107, 0.5);
}

.z-row {
    color: #00ff88;
    font-weight: 600;
    font-size: 1.05rem;
    margin-top: 8px;
}

.branch-on {
    margin-top: 10px;
    padding: 8px 12px;
    background: rgba(233, 69, 96, 0.15);
    border-radius: 8px;
    font-size: 0.9rem;
    border: 1px dashed rgba(233, 69, 96, 0.4);
}

.final-result {
    text-align: center;
    padding: 25px;
    background: linear-gradient(135deg, rgba(0, 255, 136, 0.2), rgba(0, 217, 255, 0.2));
    border-radius: 12px;
    margin-top: 20px;
}

.final-result h3 {
    color: #DADD98;
    font-size: 1.8rem;
    margin-bottom: 20px;
}

.final-result.infeasible h3 {
    color: #ff6b6b;
}

.final-solution {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
    margin: 20px 0;
}

.final-var {
    background: linear-gradient(135deg, #5C8374, #93B1A6);
    padding: 18px 32px;
    border-radius: 12px;
    text-align: center;
    min-width: 100px;
}

.final-var .var-name {
    font-size: 1rem;
    opacity: 0.9;
    color: #FAF0E6;
}

.final-var .var-value {
    font-size: 1.8rem;
    font-weight: bold;
    color: #FAF0E6;
}

.optimal-value {
    font-size: 2.2rem;
    color: #DADD98;
    font-weight: bold;
    margin-top: 15px;
}

.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;
    }
}