@import"https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css";@import"https://fonts.googleapis.com/css2?family=Sora:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap";:root{--primary: #4F46E5;--primary-dark: #3730A3;--primary-light: #818CF8;--secondary: #06B6D4;--success: #10B981;--warning: #F59E0B;--danger: #EF4444;--dark: #0F172A;--dark-2: #1E293B;--dark-3: #334155;--muted: #64748B;--light: #F1F5F9;--white: #FFFFFF;--border: #E2E8F0;--sidebar-w: 260px;--header-h: 64px;--radius: 12px;--radius-sm: 8px;--shadow: 0 4px 24px rgba(0,0,0,.08);--shadow-md: 0 8px 40px rgba(0,0,0,.12);--transition: all .2s ease;--font-main: "Sora", sans-serif;--font-mono: "JetBrains Mono", monospace}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-main);background:var(--light);color:var(--dark);font-size:14px;line-height:1.6}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:99px}.sidebar{position:fixed;top:0;left:0;width:var(--sidebar-w);height:100vh;background:var(--dark);display:flex;flex-direction:column;z-index:1000;transition:var(--transition);overflow-y:auto}.sidebar-brand{padding:20px 24px;border-bottom:1px solid var(--dark-3);display:flex;align-items:center;gap:12px}.sidebar-brand .logo-icon{width:38px;height:38px;background:linear-gradient(135deg,var(--primary),var(--secondary));border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:18px;color:#fff}.sidebar-brand .logo-text{font-size:16px;font-weight:700;color:#fff;letter-spacing:-.3px}.sidebar-brand .logo-badge{font-size:9px;background:var(--primary);color:#fff;padding:2px 6px;border-radius:99px;font-weight:600;letter-spacing:.5px;text-transform:uppercase}.sidebar-section{padding:20px 16px 8px}.sidebar-section-title{font-size:10px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:1px;padding:0 8px;margin-bottom:8px}.sidebar-nav{list-style:none}.sidebar-nav .nav-item{margin-bottom:2px}.sidebar-nav .nav-link{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:var(--radius-sm);color:#94a3b8;text-decoration:none;font-size:13.5px;font-weight:500;transition:var(--transition)}.sidebar-nav .nav-link:hover{background:var(--dark-2);color:#fff}.sidebar-nav .nav-link.active{background:linear-gradient(135deg,var(--primary),#6366F1);color:#fff;box-shadow:0 4px 12px #4f46e559}.sidebar-nav .nav-link .nav-icon{font-size:16px;width:20px;text-align:center;flex-shrink:0}.sidebar-nav .nav-link .nav-badge{margin-left:auto;background:var(--danger);color:#fff;font-size:10px;padding:2px 7px;border-radius:99px;font-weight:600}.main-wrapper{margin-left:var(--sidebar-w);min-height:100vh;display:flex;flex-direction:column}.main-header{height:var(--header-h);background:#fff;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 28px;position:sticky;top:0;z-index:100}.header-title{font-size:17px;font-weight:700;color:var(--dark)}.header-actions{display:flex;align-items:center;gap:12px}.header-avatar{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--secondary));display:flex;align-items:center;justify-content:center;color:#fff;font-size:13px;font-weight:700;cursor:pointer}.main-content{flex:1;padding:28px}.card{background:#fff;border-radius:var(--radius);border:1px solid var(--border);box-shadow:var(--shadow);overflow:hidden}.card-header{padding:18px 22px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}.card-title{font-size:15px;font-weight:700;color:var(--dark)}.card-body{padding:22px}.stat-card{background:#fff;border-radius:var(--radius);border:1px solid var(--border);padding:22px;display:flex;align-items:flex-start;gap:16px;transition:var(--transition)}.stat-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.stat-icon{width:48px;height:48px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-size:22px;flex-shrink:0}.stat-icon.purple{background:#ede9fe;color:var(--primary)}.stat-icon.cyan{background:#cffafe;color:var(--secondary)}.stat-icon.green{background:#d1fae5;color:var(--success)}.stat-icon.amber{background:#fef3c7;color:var(--warning)}.stat-icon.red{background:#fee2e2;color:var(--danger)}.stat-value{font-size:26px;font-weight:800;color:var(--dark);line-height:1;font-family:var(--font-mono)}.stat-label{font-size:12px;color:var(--muted);font-weight:500;margin-top:4px}.btn{border-radius:var(--radius-sm);font-family:var(--font-main);font-weight:600;font-size:13.5px;padding:8px 18px;transition:var(--transition);border:none;cursor:pointer;display:inline-flex;align-items:center;gap:7px}.btn-primary{background:linear-gradient(135deg,var(--primary),#6366F1);color:#fff;box-shadow:0 4px 12px #4f46e54d}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 6px 16px #4f46e566;color:#fff}.btn-success{background:linear-gradient(135deg,var(--success),#34D399);color:#fff;box-shadow:0 4px 12px #10b9814d}.btn-success:hover{transform:translateY(-1px);color:#fff}.btn-danger{background:linear-gradient(135deg,var(--danger),#F87171);color:#fff}.btn-danger:hover{transform:translateY(-1px);color:#fff}.btn-outline{background:transparent;border:1.5px solid var(--border);color:var(--dark-3)}.btn-outline:hover{border-color:var(--primary);color:var(--primary);background:#ede9fe}.btn-sm{padding:5px 12px;font-size:12px}.btn-lg{padding:12px 28px;font-size:15px}.table-wrapper{overflow-x:auto;border-radius:var(--radius)}table{width:100%;border-collapse:collapse}thead th{background:var(--light);padding:12px 16px;text-align:left;font-size:11px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.8px;border-bottom:1px solid var(--border)}tbody td{padding:14px 16px;border-bottom:1px solid var(--border);font-size:13.5px;color:var(--dark);vertical-align:middle}tbody tr:last-child td{border-bottom:none}tbody tr:hover{background:#fafbfc}.badge{display:inline-flex;align-items:center;gap:4px;padding:3px 10px;border-radius:99px;font-size:11px;font-weight:600}.badge-success{background:#d1fae5;color:#065f46}.badge-warning{background:#fef3c7;color:#92400e}.badge-danger{background:#fee2e2;color:#991b1b}.badge-primary{background:#ede9fe;color:#4338ca}.badge-info{background:#cffafe;color:#155e75}.badge-muted{background:var(--light);color:var(--muted)}.form-group{margin-bottom:18px}.form-label{display:block;font-size:13px;font-weight:600;color:var(--dark-3);margin-bottom:6px}.form-control{width:100%;padding:10px 14px;border:1.5px solid var(--border);border-radius:var(--radius-sm);font-family:var(--font-main);font-size:13.5px;color:var(--dark);background:#fff;transition:var(--transition);outline:none}.form-control:focus{border-color:var(--primary);box-shadow:0 0 0 3px #4f46e51f}.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='%2364748b' d='M6 8L1 3h10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:36px}.alert{padding:14px 18px;border-radius:var(--radius-sm);font-size:13.5px;font-weight:500;display:flex;align-items:center;gap:10px;margin-bottom:20px}.alert-success{background:#d1fae5;color:#065f46;border-left:4px solid var(--success)}.alert-danger{background:#fee2e2;color:#991b1b;border-left:4px solid var(--danger)}.alert-warning{background:#fef3c7;color:#92400e;border-left:4px solid var(--warning)}.alert-info{background:#cffafe;color:#155e75;border-left:4px solid var(--secondary)}.page-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}.page-title{font-size:22px;font-weight:800;color:var(--dark);letter-spacing:-.5px}.page-subtitle{font-size:13px;color:var(--muted);margin-top:2px}.difficulty{display:flex;gap:3px}.difficulty .star{font-size:12px}.difficulty .star.filled{color:var(--warning)}.difficulty .star.empty{color:var(--border)}.progress{height:8px;background:var(--light);border-radius:99px;overflow:hidden}.progress-bar{height:100%;border-radius:99px;background:linear-gradient(90deg,var(--primary),var(--secondary));transition:width .5s ease}@media(max-width:768px){.sidebar{transform:translate(-100%)}.sidebar.open{transform:translate(0)}.main-wrapper{margin-left:0}.main-content{padding:16px}}