/* ============================================
   CSS Variables & Theme Configuration
   ============================================ */
:root {
    /* Colors - Light Mode */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8f9fa;
    --color-bg-tertiary: #f1f3f5;
    --color-text-primary: #212529;
    --color-text-secondary: #495057;
    --color-text-muted: #6c757d;
    --color-border: #e9ecef;
    --color-primary: #4361ee;
    --color-primary-hover: #3a56d4;
    --color-primary-light: rgba(67, 97, 238, 0.1);
    --color-success: #2ecc71;
    --color-shadow: rgba(0, 0, 0, 0.08);
    --color-shadow-hover: rgba(0, 0, 0, 0.12);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
}

[data-theme="dark"] {
    --color-bg-primary: #1a1a1a;
    --color-bg-secondary: #242424;
    --color-bg-tertiary: #2d2d2d;
    --color-text-primary: #f8f9fa;
    --color-text-secondary: #dee2e6;
    --color-text-muted: #adb5bd;
    --color-border: #3a3a3a;
    --color-primary: #5a72f5;
    --color-primary-hover: #4361ee;
    --color-primary-light: rgba(90, 114, 245, 0.15);
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-shadow-hover: rgba(0, 0, 0, 0.4);
}

/* ============================================
   Base Styles
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--color-bg-secondary);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
    padding: var(--spacing-xl) var(--spacing-md);
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* ============================================
   Container
   ============================================ */
.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--color-bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: 0 4px 20px var(--color-shadow);
    padding: var(--spacing-xxl);
}

/* ============================================
   Theme Toggle Button
   ============================================ */
.theme-toggle {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    z-index: 1000;
    box-shadow: 0 2px 8px var(--color-shadow);
}

.theme-toggle:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px var(--color-shadow-hover);
}

/* ============================================
   Header
   ============================================ */
.header {
    text-align: center;
    margin-bottom: var(--spacing-xxl);
}

.header-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    border-radius: var(--radius-lg);
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.header-icon i {
    font-size: 1.75rem;
}

.header-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.header-subtitle {
    font-size: 1rem;
    color: var(--color-text-muted);
    font-weight: 400;
}

/* ============================================
   Input Section
   ============================================ */
.input-section {
    margin-bottom: var(--spacing-xl);
}

.input-grid {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: var(--spacing-md);
}

@media (min-width: 600px) {
    .input-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.input-item {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    transition: all var(--transition-normal);
}

.input-item:hover {
    border-color: var(--color-primary);
    box-shadow: 0 4px 12px var(--color-shadow);
    transform: translateY(-2px);
}

.input-label {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    cursor: pointer;
}

.input-label-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    background-color: var(--color-primary-light);
    color: var(--color-primary);
    flex-shrink: 0;
}

.input-label-icon i {
    font-size: 0.875rem;
}

.input-label-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.input-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-primary);
    letter-spacing: 0.02em;
}

.input-subtitle {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    font-weight: 400;
}

.input-meta {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.input-field {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1rem;
    font-family: inherit;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.input-field::placeholder {
    color: var(--color-text-muted);
}

.input-field:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

/* ============================================
   Action Buttons
   ============================================ */
.action-section {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.btn-primary,
.btn-secondary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(67, 97, 238, 0.3);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background-color: var(--color-bg-tertiary);
    border-color: var(--color-text-muted);
}

/* ============================================
   Result Section
   ============================================ */
.result-section {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.result-section.hidden,
.visualization-section.hidden {
    display: none;
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.result-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.score-badge {
    background-color: var(--color-primary);
    color: #ffffff;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ============================================
   Scores Grid
   ============================================ */
.scores-grid {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

@media (min-width: 600px) {
    .scores-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.score-item {
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

.score-item-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-sm);
}

.score-item-info h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 2px;
}

.score-item-info p {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin: 0;
}

.score-item-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
}

.score-item-max {
    font-size: 0.625rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ============================================
   Progress Bar in Score Item
   ============================================ */
.progress-bar-mini {
    height: 4px;
    background-color: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-top: var(--spacing-sm);
}

.progress-bar-fill {
    height: 100%;
    background-color: var(--color-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-normal);
}

/* ============================================
   Average Card
   ============================================ */
.average-card {
    background-color: var(--color-primary-light);
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.average-info {
    flex: 1;
}

.average-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.average-subtitle {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin: 0;
}

.average-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -0.02em;
}

/* ============================================
   Progress Section
   ============================================ */
.progress-section {
    margin-bottom: var(--spacing-lg);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.progress-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.progress-value {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary);
}

.progress-track {
    height: 8px;
    background-color: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: var(--color-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-normal);
}

/* ============================================
   Visualization Section
   ============================================ */
.visualization-section {
    background-color: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
}

.visualization-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.visualization-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.chart-buttons {
    display: flex;
    gap: var(--spacing-xs);
}

.chart-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
    font-weight: 500;
    font-family: inherit;
    color: var(--color-primary);
    background-color: transparent;
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.chart-btn:hover,
.chart-btn.active {
    background-color: var(--color-primary);
    color: #ffffff;
}

.chart-container {
    position: relative;
    height: 300px;
    width: 100%;
}

.chart-note {
    text-align: center;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: var(--spacing-md);
    margin-bottom: 0;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.footer p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin: 0;
}

/* ============================================
   Responsive Adjustments
   ============================================ */
@media (max-width: 600px) {
    body {
        padding: var(--spacing-md);
    }
    
    .container {
        padding: var(--spacing-lg);
    }
    
    .header-title {
        font-size: 1.5rem;
    }
    
    .action-section {
        grid-template-columns: 1fr;
    }
    
    .result-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .average-card {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .visualization-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
}