.navbar{background-color:var(--header-bg);padding:1rem 0;color:var(--header-text);box-shadow:0 2px 4px #0000001a;position:sticky;top:0;z-index:1000}.nav-content{display:flex;justify-content:space-between;align-items:center}.brand{font-size:1.5rem;font-weight:700;color:var(--header-text)}.nav-links{display:flex;align-items:center;gap:1.5rem}.nav-link{color:#fffc;font-weight:500;text-decoration:none;transition:color .2s}.nav-link:hover,.nav-link.active{color:#fff}.btn-logout-nav{border:1px solid rgba(255,255,255,.6);background:transparent;color:#fff;padding:.5rem 1rem;border-radius:4px;cursor:pointer;font-weight:500;transition:all .2s}.btn-logout-nav:hover{background:#ffffff1a}.mobile-toggle{display:none;cursor:pointer;color:#fff}@media(max-width:768px){.mobile-toggle{display:block}.nav-links{display:none;position:absolute;top:100%;left:0;width:100%;background-color:var(--header-bg);flex-direction:column;padding:1.5rem 0;box-shadow:0 4px 6px -1px #0000001a}.nav-links.active{display:flex}.nav-link{width:100%;text-align:center;padding:.75rem 0;display:block}.btn-logout-nav{margin-top:.5rem;width:80%}}.auth-container{display:flex;justify-content:center;align-items:center;min-height:calc(100vh - 70px);padding:1rem;background-color:var(--bg-primary);overflow:hidden}.auth-card{background-color:var(--bg-secondary);padding:2rem 2.5rem;border-radius:1.25rem;width:100%;max-width:480px;box-shadow:0 10px 25px -5px #0000000a,0 8px 10px -6px #0000000a;border:1px solid var(--border-color);transition:all .3s ease;animation:fadeInScale .4s ease-out}@keyframes fadeInScale{0%{opacity:0;transform:scale(.98) translateY(10px)}to{opacity:1;transform:scale(1) translateY(0)}}.auth-header{text-align:center;margin-bottom:2rem}.auth-title{font-size:1.85rem;margin-bottom:.5rem;color:var(--text-primary);font-weight:800;letter-spacing:-.03em;line-height:1.2}.auth-subtitle{color:var(--text-secondary);font-size:.95rem;line-height:1.4;max-width:280px;margin:0 auto}.form-group{margin-bottom:1.25rem;position:relative}.form-label{display:block;margin-bottom:.5rem;font-weight:600;color:var(--text-primary);font-size:.85rem;letter-spacing:.01em}.input-wrapper{position:relative;display:flex;align-items:center}.input-field,.input-field-with-icon{width:100%;padding:.75rem 1rem;border-radius:.625rem;background-color:#fff;border:1.5px solid var(--border-color);color:var(--text-primary);font-size:.95rem;transition:all .2s cubic-bezier(.4,0,.2,1)}.input-field-with-icon{padding-left:2.5rem}.input-icon-left{position:absolute;left:.875rem;color:var(--text-secondary);display:flex;align-items:center;justify-content:center;pointer-events:none;z-index:1}.input-field-with-icon:focus{outline:none;border-color:var(--accent-color);box-shadow:0 0 0 4px #007bff0f}.input-wrapper:focus-within .input-icon-left{color:var(--accent-color)}.password-toggle{position:absolute;right:.875rem;background:none;border:none;color:var(--text-secondary);cursor:pointer;padding:4px;display:flex;align-items:center;transition:all .2s}.password-toggle:hover{color:var(--accent-color)}.btn-auth{width:100%;padding:.75rem;background-color:var(--accent-color);color:#fff;border:none;border-radius:.625rem;font-size:1rem;font-weight:700;cursor:pointer;transition:all .25s;margin-top:.75rem;display:flex;align-items:center;justify-content:center;gap:.5rem}.btn-auth:hover{background-color:var(--accent-hover);transform:translateY(-1px)}.auth-footer{text-align:center;margin-top:1.5rem;color:var(--text-secondary);font-size:.9rem;display:flex;align-items:center;justify-content:center;gap:.4rem}.auth-link{color:var(--accent-color);font-weight:700;display:inline-flex;align-items:center;gap:.2rem;transition:all .2s}.auth-link:hover{text-decoration:none;transform:translate(2px)}.spinner{width:18px;height:18px;border:2px solid rgba(255,255,255,.3);border-radius:50%;border-top-color:#fff;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media(max-width:640px){.auth-card{padding:2.5rem 1.5rem;border-radius:1rem}.auth-title{font-size:1.85rem}}@media(max-width:480px){.auth-container{padding:1rem;background-color:var(--bg-secondary)}.auth-card{padding:2rem 1rem;box-shadow:none;border:none}}.dashboard{padding-top:3rem;padding-bottom:3rem;max-width:1000px}.hero-section{text-align:center;margin-bottom:3rem}.dashboard-title{font-size:2rem;color:var(--accent-color);font-weight:700;margin-bottom:.5rem}.dashboard-subtitle{color:var(--text-secondary);margin-bottom:2rem}.topic-card{background-color:#fff;border-radius:.5rem;margin-bottom:1.5rem;box-shadow:0 4px 6px -1px #0000001a;border:none;overflow:hidden}.topic-header{padding:1rem 1.5rem;display:flex;justify-content:space-between;align-items:center;cursor:pointer;background-color:var(--accordion-bg);color:#fff;font-weight:600}.topic-header-content{display:flex;align-items:center;gap:.5rem}.badge-pending{background-color:#dc3545;color:#fff;font-size:.7rem;padding:.1rem .4rem;border-radius:4px;font-weight:700}.badge-done{background-color:#28a745;color:#fff;font-size:.7rem;padding:.1rem .4rem;border-radius:4px;font-weight:700}.problems-container{padding:1.5rem;background-color:#e3f2fd}.subtopics-header{font-size:1.5rem;font-weight:700;margin-bottom:1rem;color:#333}.problems-table{width:100%;border-collapse:collapse;background-color:#fff;border-radius:.5rem;overflow:hidden;min-width:600px}.problems-table th{text-align:left;padding:1rem;background-color:#fff;font-weight:700;color:#333;border-bottom:1px solid #eee;white-space:nowrap}.problems-table td{padding:1rem;border-bottom:1px solid #eee;color:#555;vertical-align:middle}.problems-table tr:last-child td{border-bottom:none}.problems-table tr:hover{background-color:#f8f9fa}.col-checkbox{width:30px}.col-name{font-weight:500}.link-btn{color:var(--accent-color);text-decoration:underline;font-weight:500;cursor:pointer}.level-badge{text-transform:uppercase;font-weight:600;font-size:.85rem}.status-text{font-weight:500}.status-done{color:var(--success-color)}.status-pending{color:var(--text-secondary)}@media(max-width:768px){.dashboard{padding-top:1.5rem;padding-bottom:1.5rem}.topic-header{padding:.75rem 1rem}.problems-container{padding:.75rem}.subtopics-header{font-size:1.25rem;margin-bottom:.75rem}.dashboard-title{font-size:1.75rem}}.progress-container{max-width:1000px;margin:3rem auto;padding:0 1rem}.progress-header{text-align:center;margin-bottom:3rem}.progress-header h1{font-size:2.5rem;color:var(--text-primary);margin-bottom:.5rem;font-weight:800}.progress-header p{color:var(--text-secondary);font-size:1.1rem}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1.5rem;margin-bottom:3rem}.stat-card{background:#fff;padding:1.5rem;border-radius:1rem;box-shadow:0 4px 20px #0000000d;transition:transform .2s ease,box-shadow .2s ease;border:1px solid rgba(0,0,0,.05)}.stat-card:hover{transform:translateY(-5px);box-shadow:0 8px 30px #0000001a}.stat-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:.5rem}.stat-title{font-size:1.1rem;font-weight:600;color:var(--text-secondary)}.stat-percent{font-size:2rem;font-weight:700;color:var(--text-primary)}.stat-count{color:var(--text-secondary);font-size:.9rem;margin-bottom:1rem;display:block}.progress-bar-bg{width:100%;height:10px;background-color:#f0f2f5;border-radius:5px;overflow:hidden}.progress-bar-fill{height:100%;border-radius:5px;transition:width 1s ease-in-out}.fill-easy{background-color:var(--success-color);box-shadow:0 2px 10px #28a74533}.fill-medium{background-color:var(--warning-color);box-shadow:0 2px 10px #ffc10733}.fill-hard{background-color:var(--danger-color);box-shadow:0 2px 10px #dc354533}.total-progress-card{background:linear-gradient(135deg,var(--accent-color),var(--accent-hover));color:#fff;padding:2rem;border-radius:1rem;display:flex;align-items:center;justify-content:space-between;margin-bottom:2rem;box-shadow:0 4px 20px #007bff4d}.total-info h2{margin:0 0 .5rem;font-size:1.8rem}.total-info p{margin:0;opacity:.9}.circle-chart{width:100px;height:100px}.circle-bg{fill:none;stroke:#fff3;stroke-width:3.8}.circle{fill:none;stroke:#fff;stroke-width:3.8;stroke-linecap:round;transition:stroke-dasharray 1s ease-in-out}.circle-text{fill:#fff;font-family:inherit;font-weight:700;font-size:.5em;text-anchor:middle}@media(max-width:600px){.total-progress-card{flex-direction:column;text-align:center;gap:1.5rem}}:root{--bg-primary: #f8f9fa;--bg-secondary: #ffffff;--text-primary: #333333;--text-secondary: #666666;--accent-color: #007bff;--accent-hover: #0056b3;--header-bg: #007bff;--header-text: #ffffff;--accordion-bg: #00bcd4;--accordion-text: #ffffff;--border-color: #dee2e6;--success-color: #28a745;--warning-color: #ffc107;--danger-color: #dc3545;--table-header-bg: #ffffff;--table-row-hover: #f8f9fa;--status-done: #28a745;--status-pending: #6c757d}body{margin:0;font-family:Inter,system-ui,-apple-system,sans-serif;background-color:var(--bg-primary);color:var(--text-primary);line-height:1.5;-webkit-tap-highlight-color:transparent}*,*:before,*:after{box-sizing:border-box}a{color:inherit;text-decoration:none}ul{list-style:none;padding:0}.container{max-width:1200px;margin:0 auto;padding:0 1rem}.btn{padding:.5rem 1rem;border-radius:.25rem;font-weight:500;cursor:pointer;transition:all .2s;border:1px solid transparent;font-size:.95rem}.btn-primary{background-color:var(--accent-color);color:#fff}.btn-primary:hover{background-color:var(--accent-hover)}.btn-outline-light{border:1px solid rgba(255,255,255,.5);background:transparent;color:#fff}.btn-outline-light:hover{background:#ffffff1a}.input-field{width:100%;padding:.75rem;border-radius:.25rem;background-color:#fff;border:1px solid var(--border-color);color:var(--text-primary);margin-bottom:1rem}.input-field:focus{outline:2px solid var(--accent-color);border-color:transparent}@media(max-width:768px){.input-field{font-size:16px}}