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

:root {
    --primary-color: #0052cc;
    --primary-hover: #0747a6;
    --success-color: #00875a;
    --danger-color: #de350b;
    --warning-color: #ff991f;
    --background: #f4f5f7;
    --surface: #ffffff;
    --text-primary: #172b4d;
    --text-secondary: #6b778c;
    --border: #dfe1e6;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    --radius: 8px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    background: var(--surface);
    padding: 30px;
    text-align: center;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    margin-bottom: 30px;
    position: relative;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 10px;
}

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

.language-selector {
    position: absolute;
    top: 20px;
    right: 20px;
}

.language-selector select {
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--surface);
    color: var(--text-primary);
    cursor: pointer;
    font-size: 14px;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    background: var(--surface);
    padding: 10px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    overflow-x: auto;
}

.tab-button {
    padding: 12px 24px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.tab-button:hover {
    background: var(--background);
    color: var(--text-primary);
}

.tab-button.active {
    background: var(--primary-color);
    color: white;
}

/* Cards */
.card {
    background: var(--surface);
    padding: 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    margin-bottom: 20px;
}

.card h2 {
    color: var(--text-primary);
    margin-bottom: 20px;
    font-size: 1.8rem;
}

/* Form Elements */
input[type="text"],
input[type="number"],
select {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border);
    border-radius: 4px;
    font-size: 16px;
    transition: border-color 0.3s;
}

input[type="text"]:focus,
input[type="number"]:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.input-group {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.input-group input {
    flex: 1;
}

/* Buttons */
.btn-primary,
.btn-secondary {
    padding: 12px 24px;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--background);
    color: var(--text-primary);
    border: 2px solid var(--border);
}

.btn-secondary:hover {
    background: var(--border);
    transform: translateY(-1px);
}

.btn-remove {
    padding: 4px 8px;
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 12px;
    cursor: pointer;
}

/* Lists */
.item-list {
    list-style: none;
    margin-top: 20px;
}

.item-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    background: var(--background);
    border-radius: 4px;
    margin-bottom: 10px;
}

/* Matrix Table */
#matrixTable {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

#matrixTable th,
#matrixTable td {
    padding: 12px;
    text-align: center;
    border: 1px solid var(--border);
}

#matrixTable th {
    background: var(--background);
    font-weight: 600;
    color: var(--text-primary);
}

.weight-input,
.score-input {
    width: 80px;
    text-align: center;
    padding: 8px;
    border: 2px solid var(--border);
    border-radius: 4px;
}

.weight-total {
    margin-top: 20px;
    padding: 15px;
    background: var(--background);
    border-radius: 4px;
    display: flex;
    justify-content: space-between;
    font-weight: 600;
}

/* Sensitivity Analysis */
.sensitivity-control {
    margin-bottom: 20px;
    padding: 15px;
    background: var(--background);
    border-radius: 4px;
}

.sensitivity-control label {
    display: block;
    margin-bottom: 10px;
    font-weight: 500;
}

.sensitivity-control input[type="range"] {
    width: calc(100% - 60px);
    margin-right: 10px;
}

.sensitivity-control span {
    font-weight: 600;
    color: var(--primary-color);
}

/* Charts */
.chart-container {
    position: relative;
    height: 400px;
    margin: 30px 0;
}

.chart-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin: 30px 0;
}

/* Pros & Cons */
.proscons-option {
    margin-bottom: 30px;
    padding: 20px;
    background: var(--background);
    border-radius: var(--radius);
}

.proscons-option h3 {
    color: var(--primary-color);
    margin-bottom: 20px;
}

.proscons-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.pros,
.cons {
    padding: 20px;
    background: var(--surface);
    border-radius: 4px;
}

.pros h4 {
    color: var(--success-color);
    margin-bottom: 15px;
}

.cons h4 {
    color: var(--danger-color);
    margin-bottom: 15px;
}

.pros ul,
.cons ul {
    list-style: none;
    margin-bottom: 15px;
}

.pros li,
.cons li {
    padding: 8px;
    margin-bottom: 8px;
    background: var(--background);
    border-radius: 4px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.pros li button,
.cons li button {
    background: transparent;
    border: none;
    color: var(--danger-color);
    cursor: pointer;
    font-size: 18px;
    padding: 0 5px;
}

/* Results */
.winner-announcement {
    text-align: center;
    padding: 30px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    border-radius: var(--radius);
    margin-bottom: 30px;
}

.winner-name {
    font-size: 2rem;
    font-weight: 700;
    margin: 15px 0;
}

.winner-score {
    font-size: 1.2rem;
    opacity: 0.9;
}

.results-table {
    margin: 30px 0;
}

#resultsTable {
    width: 100%;
    border-collapse: collapse;
}

#resultsTable th,
#resultsTable td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

#resultsTable th {
    background: var(--background);
    font-weight: 600;
}

.winner-row {
    background: rgba(0, 135, 90, 0.1);
    font-weight: 600;
}

.action-buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    margin-top: 30px;
}

/* Footer */
footer {
    text-align: center;
    padding: 30px;
    color: var(--text-secondary);
    margin-top: 50px;
}

/* Utilities */
.help-text {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 20px;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    .tabs {
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .tab-button {
        padding: 10px 16px;
        font-size: 14px;
    }
    
    .chart-grid {
        grid-template-columns: 1fr;
    }
    
    .proscons-grid {
        grid-template-columns: 1fr;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .action-buttons button {
        width: 100%;
    }
    
    .language-selector {
        position: static;
        margin-top: 20px;
    }
    
    #matrixTable {
        font-size: 14px;
    }
    
    .weight-input,
    .score-input {
        width: 60px;
        padding: 6px;
    }
}