:root{--color-primary: #667eea;--color-primary-dark: #5568d3;--color-primary-light: #764ba2;--color-primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);--color-success: #52c41a;--color-success-bg: #f6ffed;--color-warning: #faad14;--color-warning-bg: #fffbe6;--color-error: #ff4d4f;--color-error-bg: #fff1f0;--color-info: #1890ff;--color-info-bg: #e6f7ff;--color-text-primary: #1a1a1a;--color-text-secondary: #666;--color-text-tertiary: #888;--color-text-disabled: #bbb;--color-bg-primary: #ffffff;--color-bg-secondary: #fafafa;--color-bg-tertiary: #f5f5f5;--color-border: #e8e8e8;--color-border-light: #f0f0f0;--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 12px;--spacing-lg: 16px;--spacing-xl: 20px;--spacing-2xl: 24px;--spacing-3xl: 32px;--spacing-4xl: 40px;--radius-sm: 6px;--radius-md: 8px;--radius-lg: 12px;--radius-xl: 16px;--radius-2xl: 20px;--radius-full: 9999px;--shadow-sm: 0 2px 4px rgba(0, 0, 0, .06);--shadow-md: 0 4px 12px rgba(0, 0, 0, .08);--shadow-lg: 0 6px 20px 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var(--color-border);border-radius:var(--radius-md);font-size:var(--font-size-md);font-family:var(--font-family);background:var(--color-bg-primary);color:var(--color-text-primary);transition:all var(--transition-base)}.input-base:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px #667eea1a}.input-base::placeholder{color:var(--color-text-tertiary)}.select-base{padding:var(--spacing-md) var(--spacing-lg);border:1px solid var(--color-border);border-radius:var(--radius-md);font-size:var(--font-size-md);font-family:var(--font-family);background:var(--color-bg-primary);color:var(--color-text-primary);cursor:pointer;transition:all var(--transition-base)}.select-base:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px #667eea1a}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeInDown{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}@keyframes 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button:active{transform:translateY(0)}@media(max-width:768px){.error-content{padding:var(--spacing-2xl)}.error-icon{font-size:56px}.error-content h2{font-size:var(--font-size-2xl)}.error-content p{font-size:var(--font-size-md)}.error-content button{width:100%;justify-content:center}}.header{position:relative;text-align:center;color:#fff;margin-bottom:var(--spacing-4xl);padding:var(--spacing-3xl) var(--spacing-xl);animation:fadeInDown .8s ease;overflow:visible}.header-content{position:relative;z-index:2;display:flex;flex-direction:column;align-items:center;gap:var(--spacing-lg)}.header-icon{font-size:64px;filter:drop-shadow(0 4px 8px rgba(0,0,0,.3));animation:float 3s ease-in-out infinite}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.header-text{display:flex;flex-direction:column;gap:var(--spacing-sm)}.header h1{font-size:42px;font-weight:var(--font-weight-bold);margin:0;text-shadow:2px 2px 12px 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h3:before{content:"";width:4px;height:20px;background:var(--color-primary-gradient);border-radius:var(--radius-sm)}.chart-header-with-select{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-xl)}.chart-header-with-select h3{margin:0}.chart-container{position:relative;min-height:320px;height:320px}.chart-legend{display:flex;justify-content:center;gap:var(--spacing-xl);margin-top:var(--spacing-lg);flex-wrap:wrap}.legend-item{display:flex;align-items:center;gap:var(--spacing-sm);font-size:var(--font-size-sm);color:var(--color-text-secondary)}.legend-color{width:14px;height:14px;border-radius:var(--radius-sm)}.subject-selector{padding:var(--spacing-sm) var(--spacing-lg);border:1px solid var(--color-border);border-radius:var(--radius-md);font-size:var(--font-size-md);font-family:var(--font-family);background:var(--color-bg-primary);cursor:pointer;transition:all .2s ease}.subject-selector:hover{border-color:var(--color-primary)}.subject-selector:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px #667eea26}@media(min-width:1400px){.dashboard-charts{grid-template-columns:1.3fr .7fr;gap:var(--spacing-3xl)}.chart-container{height:380px}}@media(max-width:1024px){.dashboard-charts{grid-template-columns:1fr}.chart-half-width{grid-column:1 / -1}}@media(max-width:768px){.class-dashboard{padding:var(--spacing-xl);border-radius:var(--radius-xl)}.dashboard-header{flex-direction:column;align-items:flex-start}.dashboard-title h2{font-size:22px}.dashboard-actions{width:100%;flex-direction:column}.dashboard-actions .btn{width:100%;justify-content:center}.chart-card{padding:var(--spacing-xl)}.chart-container{height:280px;min-height:280px}}@media(max-width:480px){.dashboard-title h2{font-size:18px}.chart-card{padding:var(--spacing-lg)}.chart-card h3{font-size:var(--font-size-md)}.chart-container{height:240px;min-height:240px}}.container{max-width:1800px;margin:0 auto;padding:var(--spacing-xl) var(--spacing-4xl);min-height:100vh}.detail-section{background:var(--color-bg-primary);padding:var(--spacing-4xl);border-radius:var(--radius-2xl);box-shadow:var(--shadow-xl);animation:pageSlideIn .5s ease-out;border:1px solid var(--color-border-light)}@keyframes pageSlideIn{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}.detail-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-3xl);padding-bottom:var(--spacing-2xl);border-bottom:3px solid transparent;border-image:var(--color-primary-gradient) 1;flex-wrap:wrap;gap:var(--spacing-xl)}.detail-header h2{font-size:var(--font-size-4xl);font-weight:var(--font-weight-bold);margin:0;background:var(--color-primary-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.charts-container{display:grid;grid-template-columns:repeat(auto-fit,minmax(400px,1fr));gap:var(--spacing-2xl);margin-top:var(--spacing-3xl)}.charts-container>div{background:var(--color-bg-primary);border-radius:var(--radius-xl);padding:var(--spacing-2xl);box-shadow:var(--shadow-md);border:1px solid var(--color-border-light);transition:all .3s ease}.charts-container>div:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}@media(max-width:1400px){.container{padding:var(--spacing-xl) var(--spacing-2xl)}}@media(max-width:1200px){.container{padding:var(--spacing-xl)}.charts-container{grid-template-columns:1fr}}@media(max-width:768px){.container{padding:var(--spacing-lg)}.detail-header{flex-direction:column;align-items:flex-start;gap:var(--spacing-lg)}.detail-header h2{font-size:var(--font-size-2xl)}.detail-section{padding:var(--spacing-xl);border-radius:var(--radius-xl)}.charts-container{grid-template-columns:1fr;gap:var(--spacing-lg)}.charts-container>div{padding:var(--spacing-lg)}}@media(max-width:480px){.container{padding:var(--spacing-md)}.detail-section{padding:var(--spacing-lg)}.detail-header h2{font-size:var(--font-size-xl)}}