.sb-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);opacity:0;pointer-events:none;transition:opacity .25s;z-index:998}.sb-backdrop.visible{opacity:1;pointer-events:auto}.sb{position:fixed;top:0;left:0;bottom:0;width:240px;display:flex;flex-direction:column;background:var(--surface-primary);border-right:1px solid var(--border-primary);z-index:999;transition:width .25s cubic-bezier(.4,0,.2,1);overflow:hidden}.sb--collapsed{width:64px}@media (max-width: 768px){.sb{transform:translate(-100%);width:260px}.sb--mobile{transform:translate(0);box-shadow:var(--shadow-xl)}.sb--collapsed{width:260px}}.sb-logo{display:flex;align-items:center;gap:10px;padding:16px 14px;min-height:60px;border-bottom:1px solid 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.15s}.sb-collapse:hover{background:var(--primary-700);color:#fff;border-color:var(--primary-700)}.sb--collapsed .sb-logo-text{display:none}.sb--collapsed .sb-collapse{right:8px;position:relative}.sb-nav{flex:1;overflow-y:auto;overflow-x:hidden;padding:8px;display:flex;flex-direction:column;gap:2px}.sb-nav::-webkit-scrollbar{width:3px}.sb-nav::-webkit-scrollbar-thumb{background:var(--border-primary);border-radius:3px}.sb-section{margin-bottom:4px}.sb-section-label{display:block;padding:12px 10px 4px;font-size:.62rem;font-weight:700;color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.1em}.sb-link{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:8px;color:var(--text-secondary);font-size:.85rem;font-weight:500;text-decoration:none;transition:all .12s;border:none;background:none;width:100%;text-align:left;cursor:pointer;font-family:var(--font-sans)}.sb-link:hover{background:var(--surface-tertiary);color:var(--text-primary)}.sb-link--active{background:#6302d014;color:var(--primary-700);font-weight:600}.sb-link svg{flex-shrink:0}.sb--collapsed .sb-link{justify-content:center;padding:10px}.sb--collapsed .sb-link span,.sb--collapsed .sb-section-label{display:none}.sb-footer{padding:8px;border-top:1px solid var(--border-primary);display:flex;flex-direction:column;gap:2px}.hd{position:sticky;top:0;z-index:50;display:flex;align-items:center;justify-content:space-between;padding:12px 24px;height:56px;background:var(--surface-primary);border-bottom:1px solid var(--border-primary)}.hd-left{display:flex;align-items:center;gap:12px}.hd-menu{display:none;background:none;border:none;color:var(--text-secondary);cursor:pointer;padding:6px;border-radius:6px;transition:background .15s}.hd-menu:hover{background:var(--surface-tertiary)}@media (max-width: 768px){.hd-menu{display:flex}}.hd-title{font-size:1.1rem;font-weight:700;color:var(--text-primary);letter-spacing:-.02em}.hd-right{display:flex;align-items:center;gap:8px}.hd-search{display:flex;align-items:center;gap:8px;padding:7px 14px;border-radius:8px;background:var(--surface-tertiary);min-width:200px;transition:all .15s}.hd-search:focus-within{background:var(--surface-secondary);box-shadow:0 0 0 2px #6302d01f}.hd-search svg{color:var(--text-tertiary);flex-shrink:0}.hd-search input{border:none;background:none;outline:none;color:var(--text-primary);font-size:.82rem;font-family:var(--font-sans);width:100%}.hd-search input::placeholder{color:var(--text-tertiary)}@media (max-width: 640px){.hd-search{display:none}}.hd-icon-btn{width:36px;height:36px;border-radius:8px;border:none;background:var(--surface-tertiary);color:var(--text-secondary);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all 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var(--ease-out);position:relative}.form-input:focus{outline:none;border-color:var(--primary-700);background:var(--surface-primary);box-shadow:var(--shadow-sm)}.form-input:hover:not(:disabled):not(:focus){border-color:var(--primary-500)}.form-input:disabled{background:var(--surface-tertiary);color:var(--text-disabled);cursor:not-allowed;opacity:.6}.form-input.error{border-color:var(--error)}.form-input-error{font-size:var(--text-xs);color:var(--error);margin-top:-4px}.form-textarea{min-height:100px;resize:vertical;font-family:var(--font-sans)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);border:none;border-radius:var(--radius-lg);font-weight:600;cursor:pointer;transition:all var(--transition-normal) var(--ease-out);font-family:var(--font-sans)}.btn-primary{background:linear-gradient(135deg,var(--primary-700),var(--primary-500));color:var(--surface-primary);box-shadow:var(--shadow-purple);position:relative}.btn-primary:hover:not(:disabled){transform:translateY(-2px);box-shadow:var(--shadow-glow)}.btn-primary:active:not(:disabled){transform:translateY(0)}.btn-secondary{background:transparent;color:var(--text-primary);border:2px solid var(--border-primary);transition:all var(--transition-fast) var(--ease-out)}.btn-secondary:hover:not(:disabled){background:var(--surface-secondary);border-color:var(--primary-500);color:var(--primary-700);transform:translateY(-2px);box-shadow:var(--shadow-sm)}.btn-danger{background:var(--error-light);color:var(--error);border:2px solid var(--error)}.btn-danger:hover:not(:disabled){background:var(--error);color:var(--surface-primary);box-shadow:var(--shadow-sm)}.btn-small{padding:var(--space-2) var(--space-3);font-size:var(--text-sm)}.btn-medium{padding:var(--space-3) var(--space-5);font-size:var(--text-base)}.btn-large{padding:var(--space-4) var(--space-6);font-size:var(--text-lg)}.btn-full{width:100%}.btn:disabled{opacity:.6;cursor:not-allowed;transform:none}.btn-loading{opacity:.8}.btn-spinner{width:16px;height:16px;border:2px solid var(--border-secondary);border-top-color:currentColor;border-radius:50%;animation:spin 1s linear infinite}.login-page{min-height:100vh;display:grid;grid-template-columns:1fr 1fr;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:var(--surface-secondary)}.login-content{background:linear-gradient(135deg,#6302d0,#816bde);padding:3rem;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden}.login-content:before{content:"";position:absolute;top:-50%;left:-50%;width:200%;height:200%;background:radial-gradient(circle,rgba(255,255,255,.1) 1px,transparent 1px);background-size:40px 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#0003}.feature-icon{font-size:1.5rem;margin-bottom:.75rem}.feature-card h3{font-size:1.1rem;font-weight:700;color:#fff;margin-bottom:.5rem}.feature-card p{font-size:.9rem;color:#fffc;line-height:1.5}.testimonial-section{background:#ffffff1a;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.2);border-radius:20px;padding:2rem;margin-bottom:2rem}.student-avatars{display:flex;align-items:center;margin-bottom:1.5rem}.avatar{width:50px;height:50px;border-radius:50%;border:3px solid #6302d0;overflow:hidden;margin-right:-15px;position:relative;background:var(--surface-primary)}.avatar img{width:100%;height:100%;object-fit:cover}.avatar-count{width:50px;height:50px;border-radius:50%;background:var(--accent-yellow);border:3px solid #6302d0;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.85rem;color:var(--primary-700);margin-left:10px}.testimonial-text{font-size:1rem;color:#fff;line-height:1.7;font-style:italic;margin-bottom:1rem}.testimonial-author{display:flex;flex-direction:column;gap:.25rem}.testimonial-author strong{color:var(--accent-yellow);font-size:1rem}.testimonial-author span{color:#fffc;font-size:.9rem}.stats-bar{display:grid;grid-template-columns:repeat(4,1fr);gap:1.5rem}.stat-item{text-align:center;padding:1rem;background:#ffffff1a;border-radius:12px;border:1px solid rgba(255,255,255,.15)}.stat-item h4{font-size:1.8rem;font-weight:800;color:var(--accent-yellow);margin-bottom:.25rem}.stat-item p{font-size:.85rem;color:#ffffffe6;text-transform:uppercase;letter-spacing:.5px}.login-form-section{background:var(--surface-primary);padding:3rem;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden}.login-form-section:before,.login-form-section:after{content:"";position:absolute;border-radius:50%;opacity:.08;animation:float-circle 15s ease-in-out infinite}.login-form-section:before{width:400px;height:400px;background:linear-gradient(135deg,#6302d0,#816bde);top:-150px;right:-150px;animation-delay:0s}.login-form-section:after{width:300px;height:300px;background:linear-gradient(135deg,#feedb4,#fecbc5);bottom:-100px;left:-100px;animation-delay:2s}@keyframes float-circle{0%,to{transform:translate(0) scale(1)}33%{transform:translate(20px,-20px) scale(1.1)}66%{transform:translate(-15px,15px) scale(.95)}}.floating-shapes{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;z-index:0}.shape{position:absolute;font-size:2rem;opacity:.15;animation:float-shape 10s ease-in-out infinite}.shape-1{top:10%;left:15%;animation-delay:0s}.shape-2{top:20%;right:20%;animation-delay:1s;animation-duration:12s}.shape-3{bottom:25%;left:10%;animation-delay:2s;animation-duration:14s}.shape-4{top:60%;right:15%;animation-delay:3s;animation-duration:11s}.shape-5{bottom:15%;right:25%;animation-delay:1.5s;animation-duration:13s}@keyframes float-shape{0%,to{transform:translate(0) rotate(0)}25%{transform:translate(15px,-15px) rotate(5deg)}50%{transform:translate(-10px,10px) rotate(-5deg)}75%{transform:translate(10px,15px) rotate(3deg)}}.form-container{max-width:440px;width:100%;position:relative;z-index:1;background:var(--surface-primary);padding:2.5rem;border-radius:24px;box-shadow:0 0 0 1px #00000008,0 10px 30px #6302d014,0 20px 60px #6302d00d;animation:slideInUp .6s 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ease-in-out,fadeIn .4s ease-out}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-10px)}75%{transform:translate(10px)}}.error-icon{font-size:1.25rem}.error-alert p{flex:1;color:var(--error);font-size:.9rem;margin:0}.login-form{display:flex;flex-direction:column;gap:1.5rem;animation:fadeIn .8s ease-out .4s backwards}.login-form>*{animation:slideInRight .6s ease-out backwards}.login-form>*:nth-child(1){animation-delay:.1s}.login-form>*:nth-child(2){animation-delay:.2s}.login-form>*:nth-child(3){animation-delay:.3s}.login-form>*:nth-child(4){animation-delay:.4s}.login-form>*:nth-child(5){animation-delay:.5s}.password-field{position:relative}.password-toggle{position:absolute;right:12px;top:50%;transform:translateY(-50%);background:transparent;border:none;font-size:1.25rem;cursor:pointer;padding:.5rem;margin-top:12px;transition:opacity .2s 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ease!important;position:relative;overflow:hidden}.submit-btn:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.3),transparent);transition:left .5s ease}.submit-btn:hover:before{left:100%}.submit-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 10px 30px #6302d04d!important}.submit-btn:active:not(:disabled){transform:translateY(0)}.submit-btn:disabled{opacity:.6;cursor:not-allowed}.form-footer{text-align:center;margin-top:1rem}.form-footer p{font-size:.9rem;color:var(--text-secondary)}.form-footer a{color:var(--primary-700);text-decoration:none;font-weight:600}.form-footer a:hover{text-decoration:underline}@media (max-width: 1024px){.login-page{grid-template-columns:1fr}.login-content{display:none}.login-form-section{min-height:100vh}}@media (max-width: 640px){.features-grid{grid-template-columns:1fr}.stats-bar{grid-template-columns:repeat(2,1fr)}.login-form-section{padding:2rem 1.5rem}.form-header h2{font-size:1.75rem}}.email-verification-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--color-bg-primary);padding:2rem}.verification-container{max-width:500px;width:100%;background:var(--color-surface);border-radius:16px;padding:3rem;text-align:center;box-shadow:var(--shadow-lg)}.verification-icon{width:96px;height:96px;border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 2rem;background:var(--color-primary-light);color:var(--color-primary)}.verification-icon.success{background:var(--success-light);color:var(--success)}.verification-icon.error{background:var(--error-light);color:var(--error)}.verification-icon.loading{animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.verification-container h1{font-size:1.75rem;font-weight:600;margin-bottom:1rem;color:var(--color-text-primary)}.verification-container p{color:var(--color-text-secondary);margin-bottom:2rem;line-height:1.6}.verification-actions{display:flex;flex-direction:column;gap:1rem;margin-top:2rem}.error-message{display:flex;align-items:center;justify-content:center;gap:.5rem;padding:1rem;background:var(--error-light);color:var(--error);border-radius:8px;margin-bottom:1.5rem;font-size:.9rem}@media (max-width: 768px){.verification-container{padding:2rem 1.5rem}}.db{display:flex;flex-direction:column;gap:24px;animation:dbIn .4s ease}@keyframes dbIn{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}.db-center{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:50vh;gap:16px;color:var(--text-tertiary)}.db-spin{animation:spin 1s linear infinite;color:var(--primary-700)}.db-command-bar{display:flex;align-items:center;justify-content:space-between;padding:24px 28px;border-radius:var(--radius-xl);background:var(--surface-primary);border:1px solid var(--border-primary);flex-wrap:wrap;gap:16px}.db-greeting h1{font-size:1.5rem;font-weight:800;color:var(--text-primary);letter-spacing:-.03em}.db-date{font-size:.85rem;color:var(--text-tertiary);margin-top:2px;display:block}.db-quick-actions{display:flex;gap:8px;flex-wrap:wrap}.db-action-btn{display:inline-flex;align-items:center;gap:6px;padding:9px 18px;border-radius:var(--radius-full);border:1px solid var(--border-primary);background:var(--surface-primary);color:var(--text-secondary);font-size:.82rem;font-weight:600;font-family:var(--font-sans);cursor:pointer;transition:all .2s}.db-action-btn:hover{background:var(--primary-700);color:#fff;border-color:var(--primary-700);box-shadow:0 4px 14px #6302d040}.db-alert{display:flex;align-items:center;gap:8px;padding:12px 18px;border-radius:var(--radius-lg);background:var(--error-light);color:var(--error);font-size:.88rem;font-weight:600}.db-strip{display:flex;align-items:center;padding:16px 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