@import "https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap";
:root{--violet-dark:#3a0ca3;--violet:#7209b7;--accent:#b5179e;--white:#fff;--gray-bg:#f4f5f7;--gray-100:#e8e9ec;--gray-200:#d1d3d8;--gray-300:#a0a4ad;--gray-400:#6b7080;--gray-500:#4a4f5c;--black:#1a1a2e;--gradient-primary:linear-gradient(135deg,var(--violet-dark)0%,var(--violet)50%,var(--accent)100%);--gradient-soft:linear-gradient(135deg,#e8d5f5 0%,#f3e5f5 100%);--gradient-card:linear-gradient(145deg,#fff 0%,#fafafa 100%);--shadow-sm:0 1px 2px #3a0ca30d;--shadow-md:0 4px 12px #3a0ca314;--shadow-lg:0 8px 30px #3a0ca31f;--shadow-xl:0 20px 60px #3a0ca326;--shadow-glow:0 0 20px #7209b733;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:24px;--radius-full:9999px;--transition-fast:.15s cubic-bezier(.4,0,.2,1);--transition-base:.25s cubic-bezier(.4,0,.2,1);--transition-slow:.4s cubic-bezier(.4,0,.2,1);--font-family:"Inter",-apple-system,BlinkMacSystemFont,sans-serif}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;font-size:16px}body{font-family:var(--font-family);color:var(--black);background:var(--white);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;line-height:1.6}a{color:var(--violet);transition:color var(--transition-fast);text-decoration:none}a:hover{color:var(--violet-dark)}img{max-width:100%;height:auto}h1,h2,h3,h4{color:var(--black);font-weight:700;line-height:1.3}h1{font-size:2rem}h2{font-size:1.5rem}h3{font-size:1.25rem}h4{font-size:1.1rem}.text-gradient{background:var(--gradient-primary);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text}.btn{font-family:var(--font-family);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-base);white-space:nowrap;border:none;justify-content:center;align-items:center;gap:8px;padding:12px 24px;font-size:.95rem;font-weight:600;text-decoration:none;display:inline-flex}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none!important}.btn-primary{background:var(--gradient-primary);color:#fff;box-shadow:var(--shadow-md)}.btn-primary:hover:not(:disabled){box-shadow:var(--shadow-lg);transform:translateY(-1px)}.btn-primary:active:not(:disabled){transform:translateY(0)}.btn-secondary{background:var(--gray-bg);color:var(--gray-500);border:1px solid var(--gray-100)}.btn-secondary:hover:not(:disabled){background:var(--gray-100);border-color:var(--gray-200)}.btn-outline{color:var(--violet);border:2px solid var(--violet);background:0 0}.btn-outline:hover:not(:disabled){background:var(--violet);color:#fff}.btn-danger{color:#fff;background:#e53e3e}.btn-danger:hover:not(:disabled){background:#c53030}.btn-sm{padding:8px 16px;font-size:.85rem}.btn-lg{padding:16px 32px;font-size:1.05rem}.btn-icon{border-radius:var(--radius-sm);padding:10px}.form-group{flex-direction:column;gap:6px;margin-bottom:16px;display:flex}.form-label{color:var(--gray-500);font-size:.875rem;font-weight:600}.form-input,.form-textarea,.form-select{font-family:var(--font-family);border:2px solid var(--gray-100);border-radius:var(--radius-md);background:var(--white);color:var(--black);transition:all var(--transition-fast);outline:none;width:100%;padding:12px 16px;font-size:.95rem}.form-input:focus,.form-textarea:focus,.form-select:focus{border-color:var(--violet);box-shadow:0 0 0 3px #7209b71a}.form-input::placeholder,.form-textarea::placeholder{color:var(--gray-300)}.form-textarea{resize:vertical;min-height:120px}.form-checkbox{cursor:pointer;align-items:flex-start;gap:10px;display:flex}.form-checkbox input[type=checkbox]{width:20px;height:20px;accent-color:var(--violet);flex-shrink:0;margin-top:2px}.form-error{color:#e53e3e;margin-top:4px;font-size:.8rem}.card{background:var(--white);border:1px solid var(--gray-100);border-radius:var(--radius-lg);transition:all var(--transition-base);padding:24px}.card:hover{box-shadow:var(--shadow-md)}.card-glass{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#ffffffd9;border:1px solid #ffffff4d}.badge{border-radius:var(--radius-full);text-transform:uppercase;letter-spacing:.5px;align-items:center;gap:4px;padding:4px 12px;font-size:.75rem;font-weight:600;display:inline-flex}.badge-violet{color:var(--violet);background:#7209b71a}.badge-success{color:#38b273;background:#38b2731a}.badge-warning{color:#d69e00;background:#ffb3001a}.badge-accent{color:var(--accent);background:#b5179e1a}.progress-bar{background:var(--gray-100);border-radius:var(--radius-full);width:100%;height:10px;overflow:hidden}.progress-bar-fill{background:var(--gradient-primary);border-radius:var(--radius-full);height:100%;transition:width var(--transition-slow);min-width:0}.progress-label{color:var(--violet);font-size:.85rem;font-weight:600}.toast-custom{font-family:var(--font-family)!important;border-radius:var(--radius-md)!important;box-shadow:var(--shadow-lg)!important;padding:14px 20px!important;font-weight:500!important}.status-pending{color:var(--gray-400)}.status-to-review{color:#d69e00}.status-corrected{color:#38b273}.container{max-width:1200px;margin:0 auto;padding:0 20px}.page-wrapper{flex-direction:column;min-height:100vh;display:flex}.main-content{flex:1;padding:24px 0}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-center{justify-content:center}.justify-between{justify-content:space-between}.gap-1{gap:4px}.gap-2{gap:8px}.gap-3{gap:12px}.gap-4{gap:16px}.gap-6{gap:24px}.gap-8{gap:32px}.flex-1{flex:1}.flex-wrap{flex-wrap:wrap}.grid{display:grid}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.text-center{text-align:center}.text-sm{font-size:.875rem}.text-xs{font-size:.75rem}.font-bold{font-weight:700}.font-medium{font-weight:500}.mb-1{margin-bottom:4px}.mb-2{margin-bottom:8px}.mb-3{margin-bottom:12px}.mb-4{margin-bottom:16px}.mb-6{margin-bottom:24px}.mb-8{margin-bottom:32px}.mt-2{margin-top:8px}.mt-4{margin-top:16px}.mt-6{margin-top:24px}.w-full{width:100%}.hidden{display:none}.skeleton{background:linear-gradient(90deg,var(--gray-100)25%,var(--gray-bg)50%,var(--gray-100)75%);border-radius:var(--radius-sm);background-size:200% 100%;animation:1.5s infinite skeleton-loading}@keyframes skeleton-loading{0%{background-position:200% 0}to{background-position:-200% 0}}.lesson-locked{opacity:.5;pointer-events:none;position:relative}.lesson-locked:after{content:"🔒";font-size:1.2rem;position:absolute;top:50%;right:16px;transform:translateY(-50%)}.upload-zone{border:2px dashed var(--gray-200);border-radius:var(--radius-md);text-align:center;cursor:pointer;transition:all var(--transition-base);color:var(--gray-400);padding:32px}.upload-zone:hover,.upload-zone.dragging{border-color:var(--violet);color:var(--violet);background:#7209b708}.accordion-header{background:var(--white);border:1px solid var(--gray-100);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);width:100%;font-family:var(--font-family);justify-content:space-between;align-items:center;padding:16px 20px;font-size:1rem;display:flex}.accordion-header:hover{background:var(--gray-bg)}.accordion-icon{transition:transform var(--transition-fast);font-size:1.2rem}.accordion-icon.open{transform:rotate(180deg)}.accordion-content{max-height:0;transition:max-height var(--transition-slow);overflow:hidden}.accordion-content.open{max-height:2000px}@media (max-width:768px){h1{font-size:1.5rem}h2{font-size:1.25rem}.grid-2,.grid-3{grid-template-columns:1fr}.container{padding:0 16px}.card{padding:16px}.btn{padding:10px 20px;font-size:.9rem}}@media (max-width:480px){h1{font-size:1.3rem}.btn-lg{width:100%;padding:12px 24px;font-size:.95rem}}.admin-layout{min-height:100vh;display:flex}.admin-sidebar{background:var(--black);color:#fff;flex-direction:column;flex-shrink:0;width:260px;padding:24px 0;display:flex}.admin-sidebar-header{border-bottom:1px solid #ffffff1a;margin-bottom:16px;padding:0 24px 24px}.admin-sidebar-header h2{color:#fff;font-size:1.1rem}.admin-sidebar-header p{color:var(--gray-300);margin-top:4px;font-size:.8rem}.admin-nav{flex:1;list-style:none}.admin-nav-item a{color:var(--gray-300);transition:all var(--transition-fast);align-items:center;gap:12px;padding:12px 24px;font-size:.9rem;font-weight:500;text-decoration:none;display:flex}.admin-nav-item a:hover,.admin-nav-item a.active{color:#fff;border-right:3px solid var(--violet);background:#7209b733}.admin-main{background:var(--gray-bg);flex:1;padding:32px;overflow-y:auto}@media (max-width:768px){.admin-layout{flex-direction:column}.admin-sidebar{width:100%;padding:16px 0}.admin-nav{gap:0;display:flex;overflow-x:auto}.admin-nav-item a{white-space:nowrap;border-right:none;padding:10px 16px}.admin-nav-item a.active{border-right:none;border-bottom:3px solid var(--violet)}.admin-main{padding:16px}}.data-table{border-collapse:collapse;background:var(--white);border-radius:var(--radius-md);width:100%;box-shadow:var(--shadow-sm);overflow:hidden}.data-table th{background:var(--gray-bg);text-align:left;color:var(--gray-400);text-transform:uppercase;letter-spacing:.5px;padding:12px 16px;font-size:.8rem;font-weight:600}.data-table td{border-top:1px solid var(--gray-100);padding:12px 16px;font-size:.9rem}.data-table tr:hover td{background:var(--gray-bg)}.modal-overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:1000;background:#00000080;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:0}.modal-content{background:var(--white);border-radius:var(--radius-lg);width:100%;max-width:600px;max-height:90vh;box-shadow:var(--shadow-xl);padding:32px;overflow-y:auto}.modal-header{justify-content:space-between;align-items:center;margin-bottom:24px;display:flex}.modal-close{cursor:pointer;color:var(--gray-400);transition:color var(--transition-fast);background:0 0;border:none;padding:4px;font-size:1.5rem}.modal-close:hover{color:var(--black)}@keyframes float-up{0%{opacity:1;transform:translateY(0)rotate(0)}to{opacity:0;transform:translateY(-100vh)rotate(720deg)}}.notification-dot{background:var(--accent);border-radius:50%;width:8px;height:8px;display:inline-block}.avatar{object-fit:cover;border:2px solid var(--gray-100);border-radius:50%;width:48px;height:48px}.avatar-lg{width:80px;height:80px}.avatar-sm{width:32px;height:32px}.navbar{background:var(--white);border-bottom:1px solid var(--gray-100);z-index:100;justify-content:space-between;align-items:center;padding:12px 24px;display:flex;position:sticky;top:0}.navbar-brand{color:var(--violet-dark);font-size:1.1rem;font-weight:800}.navbar-links{align-items:center;gap:16px;display:flex}.navbar-links a{color:var(--gray-500);border-radius:var(--radius-sm);transition:all var(--transition-fast);padding:8px 12px;font-size:.9rem;font-weight:500}.navbar-links a:hover,.navbar-links a.active{color:var(--violet);background:#7209b70d}.navbar-user{align-items:center;gap:10px;display:flex}@media (max-width:768px){.navbar{padding:10px 16px}.navbar-links{display:none}}.login-page{background:var(--gray-bg);justify-content:center;align-items:center;min-height:100vh;padding:20px;display:flex}.login-card{background:var(--white);border-radius:var(--radius-xl);width:100%;max-width:440px;box-shadow:var(--shadow-lg);text-align:center;padding:48px 40px}.login-card h1{margin-bottom:8px}.login-card p{color:var(--gray-400);margin-bottom:32px}.login-success{border-radius:var(--radius-md);color:#38b273;background:#38b27314;padding:24px}.onboarding-page{background:var(--gray-bg);justify-content:center;align-items:center;min-height:100vh;padding:20px;display:flex}.onboarding-card{background:var(--white);border-radius:var(--radius-xl);width:100%;max-width:560px;box-shadow:var(--shadow-lg);padding:40px}.dashboard-header{background:var(--gradient-primary);color:#fff;border-radius:var(--radius-lg);margin-bottom:24px;padding:32px}.dashboard-header h1{color:#fff}.dashboard-header p{opacity:.85;margin-top:4px}.dashboard-stats{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px;margin-bottom:24px;display:grid}.stat-card{background:var(--white);border:1px solid var(--gray-100);border-radius:var(--radius-md);text-align:center;padding:20px}.stat-card .stat-value{color:var(--violet-dark);font-size:2rem;font-weight:800}.stat-card .stat-label{color:var(--gray-400);text-transform:uppercase;letter-spacing:.5px;font-size:.8rem}.lesson-page{max-width:900px;margin:0 auto}.video-container{border-radius:var(--radius-lg);background:var(--black);height:0;margin-bottom:24px;padding-bottom:56.25%;position:relative;overflow:hidden}.video-container iframe{width:100%;height:100%;position:absolute;top:0;left:0}.lesson-nav{border-top:1px solid var(--gray-100);justify-content:space-between;margin-top:24px;padding:16px 0;display:flex}.section-header{justify-content:space-between;align-items:center;margin-bottom:16px;display:flex}.section-title{align-items:center;gap:8px;display:flex}.empty-state{text-align:center;color:var(--gray-300);padding:48px 24px}.empty-state p{margin-top:8px}@keyframes fade-in{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.animate-fade-in{animation:.4s ease-out fade-in}@keyframes slide-up{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.animate-slide-up{animation:.5s ease-out slide-up}@keyframes pulse-glow{0%,to{box-shadow:0 0 #7209b74d}50%{box-shadow:0 0 0 8px #7209b700}}.pulse-glow{animation:2s infinite pulse-glow}.toggle{width:48px;height:26px;display:inline-block;position:relative}.toggle input{opacity:0;width:0;height:0}.toggle-slider{cursor:pointer;background:var(--gray-200);border-radius:var(--radius-full);transition:var(--transition-fast);position:absolute;inset:0}.toggle-slider:before{content:"";width:20px;height:20px;transition:var(--transition-fast);background:#fff;border-radius:50%;position:absolute;bottom:3px;left:3px}.toggle input:checked+.toggle-slider{background:var(--violet)}.toggle input:checked+.toggle-slider:before{transform:translate(22px)}.pill-tabs{background:var(--gray-bg);border-radius:var(--radius-full);gap:8px;width:fit-content;padding:4px;display:flex}.pill-tab{border-radius:var(--radius-full);cursor:pointer;color:var(--gray-400);transition:all var(--transition-fast);font-size:.85rem;font-weight:600;font-family:var(--font-family);background:0 0;border:none;padding:8px 20px}.pill-tab.active{background:var(--white);color:var(--violet);box-shadow:var(--shadow-sm)}