:root{--bg-primary: #0f172a;--bg-secondary: #1e293b;--bg-sidebar: #0c1222;--bg-card: rgba(30, 41, 59, .7);--bg-card-hover: rgba(30, 41, 59, .9);--bg-input: #0f172a;--bg-overlay: rgba(0, 0, 0, .6);--text-primary: #f1f5f9;--text-secondary: #94a3b8;--text-muted: #64748b;--accent-primary: #8b5cf6;--accent-primary-hover: #7c3aed;--accent-secondary: #06b6d4;--accent-secondary-hover: #0891b2;--success: #10b981;--success-bg: rgba(16, 185, 129, .1);--warning: #f59e0b;--warning-bg: rgba(245, 158, 11, .1);--error: #f43f5e;--error-bg: rgba(244, 63, 94, .1);--border-color: rgba(255, 255, 255, .08);--border-focus: #8b5cf6;--gradient-primary: linear-gradient(135deg, #8b5cf6, #7c3aed);--gradient-accent: linear-gradient(135deg, #8b5cf6, #06b6d4);--gradient-card: linear-gradient(135deg, rgba(139, 92, 246, .1), rgba(6, 182, 212, .05));--font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;--font-heading: "Outfit", "Inter", sans-serif;--space-xs: 4px;--space-sm: 8px;--space-md: 16px;--space-lg: 24px;--space-xl: 32px;--space-2xl: 48px;--space-3xl: 64px;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 20px;--radius-full: 9999px;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .3);--shadow-md: 0 4px 12px rgba(0, 0, 0, .4);--shadow-lg: 0 8px 32px rgba(0, 0, 0, .5);--shadow-glow: 0 0 20px rgba(139, 92, 246, .3);--transition-fast: .15s ease;--transition-base: .3s ease;--transition-slow: .5s ease;--sidebar-width: 260px;--sidebar-collapsed: 72px;--header-height: 64px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-body);background:var(--bg-primary);color:var(--text-primary);line-height:1.6;min-height:100vh;overflow-x:hidden}h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);font-weight:600;line-height:1.3}h1{font-size:2rem;font-weight:700}h2{font-size:1.5rem}h3{font-size:1.25rem}h4{font-size:1.125rem}a{color:var(--accent-primary);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--accent-primary-hover)}button{cursor:pointer;border:none;background:none;font-family:inherit;font-size:inherit;color:inherit}input,select,textarea{font-family:inherit;font-size:inherit}.app-layout{display:flex;min-height:100vh}.main-area{flex:1;margin-left:var(--sidebar-width);min-height:100vh;transition:margin-left var(--transition-base)}.page-content{padding:var(--space-xl);padding-top:calc(var(--header-height) + var(--space-xl));max-width:1400px;margin:0 auto}.sidebar{position:fixed;left:0;top:0;width:var(--sidebar-width);height:100vh;background:var(--bg-sidebar);border-right:1px solid var(--border-color);display:flex;flex-direction:column;z-index:100;transition:width var(--transition-base);overflow:hidden}.sidebar-logo{display:flex;align-items:center;gap:var(--space-md);padding:var(--space-lg);border-bottom:1px solid var(--border-color);min-height:72px}.sidebar-logo-icon{width:40px;height:40px;border-radius:var(--radius-md);background:var(--gradient-accent);display:flex;align-items:center;justify-content:center;font-family:var(--font-heading);font-weight:800;font-size:1.25rem;color:#fff;flex-shrink:0}.sidebar-logo-text{font-family:var(--font-heading);font-size:1.1rem;font-weight:700;background:var(--gradient-accent);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;white-space:nowrap}.sidebar-nav{flex:1;padding:var(--space-md);display:flex;flex-direction:column;gap:var(--space-xs)}.sidebar-link{display:flex;align-items:center;gap:var(--space-md);padding:var(--space-sm) var(--space-md);border-radius:var(--radius-md);color:var(--text-secondary);font-weight:500;font-size:.938rem;transition:all var(--transition-fast);white-space:nowrap;text-decoration:none}.sidebar-link:hover{background:#8b5cf614;color:var(--text-primary)}.sidebar-link.active{background:#8b5cf626;color:var(--accent-primary)}.sidebar-link-icon{font-size:1.25rem;width:24px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.header{position:fixed;top:0;left:var(--sidebar-width);right:0;height:var(--header-height);background:#0f172acc;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between;padding:0 var(--space-xl);z-index:90;transition:left var(--transition-base)}.header-title{font-family:var(--font-heading);font-size:1.25rem;font-weight:600}.header-actions{display:flex;align-items:center;gap:var(--space-md)}.card{background:var(--bg-card);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:var(--space-lg);transition:all var(--transition-base)}.card:hover{border-color:#8b5cf633}.card-gradient{background:var(--gradient-card);border:1px solid rgba(139,92,246,.15)}.stat-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:var(--space-lg);margin-bottom:var(--space-xl)}.stat-card{position:relative;overflow:hidden;padding:var(--space-lg)}.stat-card:before{content:"";position:absolute;top:0;right:0;width:100px;height:100px;border-radius:50%;opacity:.1;transform:translate(30%,-30%)}.stat-card.purple:before{background:var(--accent-primary)}.stat-card.teal:before{background:var(--accent-secondary)}.stat-card.emerald:before{background:var(--success)}.stat-card.amber:before{background:var(--warning)}.stat-card-icon{width:48px;height:48px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;font-size:1.5rem;margin-bottom:var(--space-md)}.stat-card.purple .stat-card-icon{background:#8b5cf626}.stat-card.teal .stat-card-icon{background:#06b6d426}.stat-card.emerald .stat-card-icon{background:#10b98126}.stat-card.amber .stat-card-icon{background:#f59e0b26}.stat-card-value{font-family:var(--font-heading);font-size:2rem;font-weight:700;margin-bottom:var(--space-xs)}.stat-card-label{color:var(--text-secondary);font-size:.875rem}.btn{display:inline-flex;align-items:center;gap:var(--space-sm);padding:10px 20px;border-radius:var(--radius-md);font-weight:500;font-size:.938rem;transition:all var(--transition-fast);white-space:nowrap}.btn-primary{background:var(--gradient-primary);color:#fff;box-shadow:0 2px 8px #8b5cf64d}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 4px 16px #8b5cf666}.btn-secondary{background:transparent;color:var(--accent-primary);border:1px solid var(--accent-primary)}.btn-secondary:hover{background:#8b5cf61a}.btn-ghost{color:var(--text-secondary);padding:8px 12px}.btn-ghost:hover{color:var(--text-primary);background:#ffffff0d}.btn-danger{background:var(--error);color:#fff}.btn-danger:hover{background:#e11d48}.btn-sm{padding:6px 14px;font-size:.813rem}.btn-icon{width:36px;height:36px;padding:0;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-sm)}.form-group{margin-bottom:var(--space-lg)}.form-label{display:block;font-size:.875rem;font-weight:500;color:var(--text-secondary);margin-bottom:var(--space-sm)}.form-label .required{color:var(--error);margin-left:2px}.form-input,.form-select,.form-textarea{width:100%;padding:10px 14px;background:var(--bg-input);border:1px solid #334155;border-radius:var(--radius-md);color:var(--text-primary);font-size:.938rem;transition:border-color var(--transition-fast)}.form-input:focus,.form-select:focus,.form-textarea:focus{outline:none;border-color:var(--border-focus);box-shadow:0 0 0 3px #8b5cf61a}.form-input::placeholder,.form-textarea::placeholder{color:var(--text-muted)}.form-textarea{min-height:100px;resize:vertical}.form-select{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394a3b8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 14px center;padding-right:36px;cursor:pointer}.form-select option{background:var(--bg-secondary);color:var(--text-primary)}.form-error{font-size:.813rem;color:var(--error);margin-top:var(--space-xs)}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-md)}.checkbox-group{display:flex;flex-wrap:wrap;gap:var(--space-sm)}.checkbox-item{display:flex;align-items:center;gap:6px;padding:6px 14px;background:var(--bg-input);border:1px solid #334155;border-radius:var(--radius-full);cursor:pointer;font-size:.875rem;transition:all var(--transition-fast);-webkit-user-select:none;user-select:none}.checkbox-item:hover{border-color:var(--accent-primary)}.checkbox-item.checked{background:#8b5cf626;border-color:var(--accent-primary);color:var(--accent-primary)}.checkbox-item input{display:none}.data-table-wrapper{overflow-x:auto;border-radius:var(--radius-lg);border:1px solid var(--border-color)}.data-table{width:100%;border-collapse:collapse}.data-table th{text-align:left;padding:var(--space-md) var(--space-lg);font-size:.813rem;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em;background:#0f172a80;border-bottom:1px solid var(--border-color);white-space:nowrap}.data-table td{padding:var(--space-md) var(--space-lg);border-bottom:1px solid var(--border-color);font-size:.938rem}.data-table tr:last-child td{border-bottom:none}.data-table tr:hover td{background:#8b5cf60a}.data-table .clickable-name{color:var(--text-primary);font-weight:500;cursor:pointer;transition:color var(--transition-fast)}.data-table .clickable-name:hover{color:var(--accent-primary)}.badge{display:inline-flex;align-items:center;padding:3px 10px;border-radius:var(--radius-full);font-size:.75rem;font-weight:600}.badge-active{background:var(--success-bg);color:var(--success)}.badge-paused{background:var(--warning-bg);color:var(--warning)}.badge-cancelled{background:var(--error-bg);color:var(--error)}.badge-purple{background:#8b5cf626;color:var(--accent-primary)}.badge-teal{background:#06b6d426;color:var(--accent-secondary)}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:var(--bg-overlay);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:200;padding:var(--space-lg);animation:fadeIn .2s ease}.modal{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-xl);width:100%;max-width:560px;max-height:90vh;overflow-y:auto;animation:slideUp .3s ease}.modal-lg{max-width:720px}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:var(--space-lg);border-bottom:1px solid var(--border-color)}.modal-header h3{font-family:var(--font-heading)}.modal-close{width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-sm);color:var(--text-secondary);font-size:1.25rem;transition:all var(--transition-fast)}.modal-close:hover{background:#ffffff0d;color:var(--text-primary)}.modal-body{padding:var(--space-lg)}.modal-footer{display:flex;justify-content:flex-end;gap:var(--space-md);padding:var(--space-lg);border-top:1px solid var(--border-color)}.toast-container{position:fixed;top:var(--space-lg);right:var(--space-lg);z-index:300;display:flex;flex-direction:column;gap:var(--space-sm)}.toast{display:flex;align-items:center;gap:var(--space-md);padding:var(--space-md) var(--space-lg);background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-md);min-width:300px;max-width:450px;box-shadow:var(--shadow-lg);animation:slideInRight .3s ease}.toast-success{border-left:3px solid var(--success)}.toast-error{border-left:3px solid var(--error)}.toast-warning{border-left:3px solid var(--warning)}.toast-info{border-left:3px solid var(--accent-secondary)}.toast-icon{font-size:1.25rem;flex-shrink:0}.toast-message{flex:1;font-size:.875rem}.toast-dismiss{color:var(--text-muted);cursor:pointer;padding:4px;transition:color var(--transition-fast)}.toast-dismiss:hover{color:var(--text-primary)}.search-bar{position:relative;max-width:360px}.search-bar-icon{position:absolute;left:14px;top:50%;transform:translateY(-50%);color:var(--text-muted);font-size:1rem}.search-bar input{width:100%;padding:10px 14px 10px 40px;background:var(--bg-input);border:1px solid #334155;border-radius:var(--radius-md);color:var(--text-primary);font-size:.938rem;transition:all var(--transition-fast)}.search-bar input:focus{outline:none;border-color:var(--accent-primary);box-shadow:0 0 0 3px #8b5cf61a}.page-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--space-xl);flex-wrap:wrap;gap:var(--space-md)}.page-header h1{font-family:var(--font-heading)}.page-header-actions{display:flex;align-items:center;gap:var(--space-md)}.timeslot-grid{display:grid;gap:1px;background:var(--border-color);border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--border-color)}.timeslot-header{background:#0f172acc;padding:var(--space-sm) var(--space-md);font-size:.813rem;font-weight:600;color:var(--text-secondary);text-align:center}.timeslot-time{background:#0f172a80;padding:var(--space-xs) var(--space-sm);font-size:.75rem;color:var(--text-muted);text-align:right;display:flex;align-items:center;justify-content:flex-end}.timeslot-cell{background:var(--bg-secondary);min-height:36px;cursor:pointer;transition:all var(--transition-fast);position:relative}.timeslot-cell:hover{background:#8b5cf614}.timeslot-cell.available{background:#06b6d41f;border:1px solid rgba(6,182,212,.3)}.timeslot-cell.booked{background:#8b5cf626;border:1px solid rgba(139,92,246,.3)}.timeslot-cell.matched{background:#10b98126;border:1px solid rgba(16,185,129,.3)}.timeslot-cell.preferred{background:#f59e0b1f;border:1px solid rgba(245,158,11,.3)}.lesson-block{padding:6px 10px;border-radius:var(--radius-sm);font-size:.75rem;font-weight:500;margin:2px;cursor:pointer;transition:all var(--transition-fast)}.lesson-block:hover{transform:scale(1.02)}.lesson-block-student{font-weight:600;margin-bottom:2px}.lesson-block-instructor{opacity:.7;font-size:.688rem}.confirm-dialog{text-align:center;padding:var(--space-xl)}.confirm-dialog-icon{font-size:2.5rem;margin-bottom:var(--space-md)}.confirm-dialog-message{color:var(--text-secondary);margin-bottom:var(--space-xl);font-size:.938rem}.confirm-dialog-actions{display:flex;justify-content:center;gap:var(--space-md)}.empty-state{text-align:center;padding:var(--space-3xl) var(--space-xl)}.empty-state-icon{font-size:3rem;margin-bottom:var(--space-md);opacity:.5}.empty-state-title{font-size:1.125rem;font-weight:600;margin-bottom:var(--space-sm)}.empty-state-desc{color:var(--text-secondary);font-size:.875rem;margin-bottom:var(--space-lg)}.detail-page{display:grid;grid-template-columns:350px 1fr;gap:var(--space-xl)}.detail-sidebar,.detail-main{display:flex;flex-direction:column;gap:var(--space-lg)}.profile-card{text-align:center;padding:var(--space-xl)}.profile-avatar{width:80px;height:80px;border-radius:50%;background:var(--gradient-accent);display:flex;align-items:center;justify-content:center;font-family:var(--font-heading);font-size:2rem;font-weight:700;color:#fff;margin:0 auto var(--space-md)}.profile-name{font-size:1.25rem;font-weight:600;margin-bottom:var(--space-xs)}.profile-info{display:flex;flex-direction:column;gap:var(--space-md);margin-top:var(--space-lg);text-align:left}.profile-info-item{display:flex;justify-content:space-between;padding:var(--space-sm) 0;border-bottom:1px solid var(--border-color);font-size:.875rem}.profile-info-label{color:var(--text-secondary)}.profile-info-value{font-weight:500}.today-lessons{display:flex;flex-direction:column;gap:var(--space-md)}.today-lesson-card{display:flex;align-items:center;gap:var(--space-lg);padding:var(--space-md) var(--space-lg);border-radius:var(--radius-md);background:var(--bg-card);border:1px solid var(--border-color);transition:all var(--transition-fast)}.today-lesson-card:hover{border-color:#8b5cf633}.today-lesson-time{font-family:var(--font-heading);font-weight:600;font-size:.938rem;min-width:100px;color:var(--accent-secondary)}.today-lesson-info{flex:1}.today-lesson-student{font-weight:600;margin-bottom:2px}.today-lesson-details{font-size:.813rem;color:var(--text-secondary)}.matching-layout{display:grid;grid-template-columns:280px 1fr 320px;gap:var(--space-lg);min-height:600px}.matching-list{display:flex;flex-direction:column;gap:var(--space-sm)}.matching-item{padding:var(--space-md);border-radius:var(--radius-md);background:var(--bg-card);border:1px solid var(--border-color);cursor:pointer;transition:all var(--transition-fast)}.matching-item:hover,.matching-item.selected{border-color:var(--accent-primary);background:#8b5cf614}.matching-item-name{font-weight:600;margin-bottom:4px}.matching-item-meta{font-size:.813rem;color:var(--text-secondary)}.matching-result{padding:var(--space-md);border-radius:var(--radius-md);background:#10b98114;border:1px solid rgba(16,185,129,.2);cursor:pointer;transition:all var(--transition-fast)}.matching-result:hover{background:#10b98126}.notification-list{display:flex;flex-direction:column;gap:var(--space-sm)}.notification-item{display:flex;align-items:flex-start;gap:var(--space-md);padding:var(--space-md);border-radius:var(--radius-md);background:var(--bg-card);border:1px solid var(--border-color);font-size:.875rem}.notification-item-icon{font-size:1.25rem;flex-shrink:0;margin-top:2px}.notification-item-time{font-size:.75rem;color:var(--text-muted);margin-top:4px}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes slideInRight{0%{opacity:0;transform:translate(100px)}to{opacity:1;transform:translate(0)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.animate-fade-in{animation:fadeIn .3s ease}.animate-slide-up{animation:slideUp .3s ease}@keyframes blink{0%,to{opacity:1}50%{opacity:0}}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#94a3b833;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#94a3b866}@media(max-width:1024px){.detail-page,.matching-layout,.form-row{grid-template-columns:1fr}}@media(max-width:768px){.sidebar{transform:translate(-100%)}.sidebar.open{transform:translate(0)}.main-area{margin-left:0}.header{left:0}.page-content{padding:var(--space-md);padding-top:calc(var(--header-height) + var(--space-md))}.stat-cards{grid-template-columns:1fr 1fr}}@media(max-width:480px){.stat-cards{grid-template-columns:1fr}.page-header{flex-direction:column;align-items:flex-start}}