:root{--font-family: "Inter", system-ui, -apple-system, sans-serif;--color-bg-mesh-1: #1a237e;--color-bg-mesh-2: #311b92;--color-bg-mesh-3: #4a148c;--color-bg-base: #0d1137;--color-accent-primary: #6200ea;--color-accent-primary-hover: #7c4dff;--color-accent-secondary: #448aff;--color-accent-tertiary: #b388ff;--color-text-primary: #ffffff;--color-text-secondary: rgba(255, 255, 255, .7);--color-text-muted: rgba(255, 255, 255, .5);--color-danger: #ff5252;--color-success: #00c853;--color-warning: #ff9100;--surface-glass: rgba(255, 255, 255, .1);--surface-glass-hover: rgba(255, 255, 255, .15);--surface-glass-active: rgba(255, 255, 255, .2);--surface-border: rgba(255, 255, 255, .2);--shadow-glass: 0 8px 32px 0 rgba(0, 0, 0, .3);--blur-glass: blur(16px)}body{margin:0;font-family:var(--font-family);background-color:var(--color-bg-base);color:var(--color-text-primary);background:linear-gradient(135deg,var(--color-bg-base) 0%,var(--color-bg-mesh-1) 30%,var(--color-bg-mesh-2) 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20px;border-radius:12px;background:var(--surface-glass);backdrop-filter:var(--blur-glass);-webkit-backdrop-filter:var(--blur-glass);color:var(--color-text-primary);min-width:300px;max-width:450px;box-shadow:var(--shadow-glass);border:1px solid var(--surface-border);border-left:4px solid transparent}.toast-success{border-left-color:var(--color-success);background:#00c85326}.toast-success .toast-icon{color:var(--color-success)}.toast-error{border-left-color:var(--color-danger);background:#ff525226}.toast-error .toast-icon{color:var(--color-danger)}.toast-warning{border-left-color:var(--color-warning);background:#ff910026}.toast-warning .toast-icon{color:var(--color-warning)}.toast-info{border-left-color:var(--color-accent-secondary);background:#448aff26}.toast-info 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var(--surface-border);box-shadow:var(--shadow-glass);border-radius:24px}.login-header{text-align:center;margin-bottom:32px}.logo-circle{width:72px;height:72px;margin:0 auto 16px;border-radius:50%;background:var(--surface-glass);border:1px solid var(--surface-border);display:flex;align-items:center;justify-content:center;box-shadow:0 0 30px #7c4dff4d}.login-icon{color:var(--color-text-primary)}.login-header h1{margin:0 0 6px;font-family:var(--font-family);font-weight:700;font-size:1.5rem;color:var(--color-text-primary);letter-spacing:-.02em}.login-header p{color:var(--color-text-secondary);font-size:.9rem;margin:0}.login-form{display:flex;flex-direction:column;gap:16px}.form-group{display:flex;flex-direction:column;position:relative}.form-group label{font-size:.85rem;color:var(--color-text-secondary);margin-bottom:6px}.form-input-container{position:relative;display:flex;align-items:center}.form-input-container input{width:100%;padding:12px 40px 12px 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12px;font-size:.8rem;color:var(--color-text-secondary);text-transform:uppercase;letter-spacing:.05em}.mock-buttons{display:flex;gap:12px;justify-content:center}.mock-btn{flex:1;height:44px;background:transparent;border:1px solid var(--surface-border);color:var(--color-text-primary);border-radius:12px;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:8px;font-weight:500;transition:background .2s,border-color .2s}.mock-btn:hover:not(:disabled){background:var(--surface-glass);border-color:#ffffff80}.mock-btn.accent{border-color:#b388ff80;color:var(--color-accent-tertiary)}.mock-btn.accent:hover:not(:disabled){background:#b388ff1a;border-color:var(--color-accent-tertiary)}.mock-btn:disabled{opacity:.5;cursor:not-allowed}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.admin-container{max-width:1200px;margin:0 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span{display:flex;align-items:center;gap:6px}.btn-text{color:var(--color-accent-tertiary);font-weight:600}.course-view-layout{display:flex;height:100vh;background:transparent;overflow:hidden}.course-sidebar{width:320px;flex-shrink:0;background:#0006;-webkit-backdrop-filter:var(--blur-glass);backdrop-filter:var(--blur-glass);border-right:1px solid var(--surface-border);display:flex;flex-direction:column}.sidebar-header{padding:20px;border-bottom:1px solid var(--surface-border)}.back-btn{background:none;border:none;color:var(--color-text-secondary);display:flex;align-items:center;gap:8px;font-size:.9rem;font-weight:500;cursor:pointer;padding:0;margin-bottom:16px;transition:color .2s}.back-btn:hover{color:var(--color-text-primary)}.sidebar-course-title{margin:0;font-size:1.2rem;font-weight:600;color:var(--color-text-primary);line-height:1.3}.sidebar-content{flex:1;overflow-y:auto}.sidebar-section{border-bottom:1px solid rgba(255,255,255,.05)}.section-title{margin:0;padding:16px 20px;font-size:.95rem;font-weight:600;color:#fffc;background:#ffffff05}.sidebar-lessons{list-style:none;padding:0;margin:0}.sidebar-lesson-item{padding:12px 20px 12px 32px;display:flex;align-items:center;gap:12px;color:var(--color-text-secondary);font-size:.95rem;cursor:pointer;transition:all .2s}.sidebar-lesson-item:hover{background:var(--surface-glass);color:var(--color-text-primary)}.sidebar-lesson-item.active{background:#7c4dff26;color:var(--color-accent-tertiary);border-left:3px solid var(--color-accent-primary-hover);padding-left:29px}.course-main-content{flex:1;overflow-y:auto;position:relative}.empty-content{height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#ffffff80}.empty-content h3{color:#fffc;margin:0 0 8px}.video-container{position:relative;padding-bottom:56.25%;height:0;background:#000}.video-container iframe{position:absolute;top:0;left:0;width:100%;height:100%}.lesson-body{max-width:900px;margin:0 auto;padding:40px}.lesson-title-large{margin:0 0 24px;font-size:2rem;font-weight:700}.lesson-text-content{font-size:1.1rem;line-height:1.7;color:var(--color-text-secondary);margin-bottom:48px}.lesson-text-content-inner{white-space:pre-wrap;word-break:break-word}.lesson-attachments{background:var(--surface-glass);border:1px solid var(--surface-border);-webkit-backdrop-filter:var(--blur-glass);backdrop-filter:var(--blur-glass);border-radius:16px;padding:24px}.lesson-attachments h3{margin:0 0 20px;font-size:1.2rem;display:flex;align-items:center}.mr-2{margin-right:8px}.attachments-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}.attachment-card{display:flex;align-items:center;gap:16px;padding:16px;background:#0000004d;border:1px solid var(--surface-border);border-radius:12px;text-decoration:none;color:var(--color-text-primary);transition:all .2s}.attachment-card:hover{background:var(--surface-glass-active);border-color:#b388ff66;transform:translateY(-2px)}.attachment-icon{color:var(--color-accent-tertiary)}.attachment-info{display:flex;flex-direction:column;overflow:hidden}.attachment-name{font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-bottom:4px}.attachment-action{font-size:.8rem;color:var(--color-text-muted)}.error-card{max-width:480px;margin:100px auto;background:#ff52521a;border:1px solid rgba(255,82,82,.3);padding:40px;border-radius:16px;text-align:center;-webkit-backdrop-filter:var(--blur-glass);backdrop-filter:var(--blur-glass)}.error-card h2{margin:0 0 16px;color:var(--color-danger)}.error-card p{color:var(--color-text-secondary);line-height:1.5;margin:0}.profile-grid{display:grid;grid-template-columns:1fr 2fr;gap:24px;margin-top:32px}.profile-card{background:var(--surface-glass);backdrop-filter:var(--blur-glass);-webkit-backdrop-filter:var(--blur-glass);border-radius:12px;padding:24px;border:1px solid var(--surface-border);box-shadow:var(--shadow-glass)}.user-info-card{text-align:center;display:flex;flex-direction:column;align-items:center;gap:16px}.avatar-placeholder{width:100px;height:100px;border-radius:50%;background:linear-gradient(135deg,var(--color-accent-tertiary) 0%,var(--color-accent-primary) 100%);display:flex;justify-content:center;align-items:center;color:var(--color-text-primary);margin-bottom:8px;box-shadow:0 4px 15px #b388ff80}.info-row{display:flex;align-items:center;gap:8px;color:var(--color-text-secondary);font-size:.95rem}.role-badge{text-transform:capitalize;font-weight:600}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:16px;margin-top:24px}.stat-box{background:#0003;border-radius:8px;padding:20px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;border:1px solid var(--surface-border)}.stat-number{font-size:2.5rem;font-weight:700;color:var(--color-accent-tertiary)}.stat-label{font-size:.85rem;color:var(--color-text-secondary);text-transform:uppercase;letter-spacing:1px;text-align:center}.course-list-simple{display:flex;flex-direction:column;gap:16px;margin-top:24px}.simple-course-item{background:#0003;border-radius:8px;padding:16px;border:1px solid var(--surface-border)}.course-info{display:flex;justify-content:space-between;margin-bottom:12px}.course-info h4{margin:0;font-size:1rem;font-weight:600}.course-info span{font-size:.85rem;color:var(--color-accent-tertiary)}.progress-bar-container{height:6px;background:#ffffff1a;border-radius:3px;overflow:hidden}.progress-bar{height:100%;background:linear-gradient(90deg,var(--color-accent-tertiary) 0%,var(--color-accent-primary) 100%);border-radius:3px;transition:width .3s ease}@media(max-width:768px){.profile-grid{grid-template-columns:1fr}}