@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{transform:translateY(15px);opacity:0}to{transform:translateY(0);opacity:1}}@keyframes flash{0%,to{opacity:1}50%{opacity:.3}}@keyframes shine{to{background-position:200% center}}@keyframes slideAndFadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}:root{--primary-color: #4F46E5;--primary-color-dark: #3730A3;--secondary-color: #EEF2FF;--background-color: #F8FAFC;--surface-color: #FFFFFF;--text-color: #1E293B;--text-color-secondary: #475569;--text-muted: #64748B;--border-color: #E2E8F0;--error-color: #DC2626;--success-color: #16A34A;--warning-color: #D97706;--info-color: #6366F1;--font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";--table-row-alt-bg: #F8FAFC;--table-hover-bg: #F1F5F9;--result-banner-pass-bg: #ECFDF5;--result-banner-pass-text: #065F46;--result-banner-fail-bg: #FFFBEB;--result-banner-fail-text: #92400E;--explanation-bg: #F5F3FF;--explanation-border: #8B5CF6;--q-nav-answered-bg: #D1FAE5;--q-nav-unanswered-bg: #F3F4F6;--q-nav-answered-border: #6EE7B7;--answer-correct-bg: #DCFCE7;--answer-incorrect-bg: #FEE2E2;--selected-answer-bg: #E0E7FF;--tab-color-students: #4F46E5;--tab-color-classes: #F97316;--tab-color-questions: #0EA5E9;--tab-color-results: #E11D48;--tab-color-settings: #16A34A;--tab-color-students-bg: #EEF2FF;--tab-color-classes-bg: #FFF7ED;--tab-color-questions-bg: #F0F9FF;--tab-color-results-bg: #FFF1F2;--tab-color-settings-bg: #F0FDF4}body[data-theme=dark]{--primary-color: #6366F1;--primary-color-dark: #818CF8;--secondary-color: #334155;--background-color: #0F172A;--surface-color: #1E293B;--text-color: #F1F5F9;--text-color-secondary: #CBD5E1;--text-muted: #94A3B8;--border-color: #334155;--error-color: #F87171;--success-color: #4ADE80;--warning-color: #FBBF24;--table-row-alt-bg: #1A253C;--table-hover-bg: #2C384D;--result-banner-pass-bg: rgba(6, 95, 70, .5);--result-banner-pass-text: #6EE7B7;--result-banner-fail-bg: rgba(146, 64, 14, .5);--result-banner-fail-text: #FCD34D;--explanation-bg: rgba(139, 92, 246, .1);--explanation-border: #A78BFA;--q-nav-answered-bg: rgba(16, 185, 129, .2);--q-nav-unanswered-bg: #334155;--q-nav-answered-border: #34D399;--answer-correct-bg: rgba(74, 222, 128, .15);--answer-incorrect-bg: rgba(248, 113, 113, .15);--selected-answer-bg: rgba(99, 102, 241, .2);--tab-color-students-bg: rgba(79, 70, 229, .2);--tab-color-classes-bg: rgba(249, 115, 22, .2);--tab-color-questions-bg: rgba(14, 165, 233, .2);--tab-color-results-bg: rgba(225, 29, 72, .2);--tab-color-settings-bg: rgba(22, 163, 74, .2)}body[data-color-theme=orange]{--primary-color: #F97316;--primary-color-dark: #C2410C}body[data-color-theme=orange][data-theme=dark]{--primary-color: #FB923C;--primary-color-dark: #FDBA74}body[data-color-theme=sky]{--primary-color: #0EA5E9;--primary-color-dark: #0369A1}body[data-color-theme=sky][data-theme=dark]{--primary-color: #38BDF8;--primary-color-dark: #7DD3FC}body[data-color-theme=rose]{--primary-color: #E11D48;--primary-color-dark: #9F1239}body[data-color-theme=rose][data-theme=dark]{--primary-color: #F43F5E;--primary-color-dark: #FDA4AF}body[data-color-theme=green]{--primary-color: #16A34A;--primary-color-dark: #14532D}body[data-color-theme=green][data-theme=dark]{--primary-color: #4ADE80;--primary-color-dark: #86EFAC}body{margin:0;font-family:var(--font-family);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:var(--background-color);color:var(--text-color);transition:background-color .3s,color .3s}.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:#f8fafc;padding:20px;position:relative}.theme-toggle-fixed{position:absolute;top:20px;right:30px;z-index:100}.loading-container,.error-container{height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;background-color:var(--background-color)}.section-container{background:var(--surface-color);border-radius:12px;padding:24px;box-shadow:0 1px 3px #0000001a;margin-bottom:24px}.section-container h4{margin-top:0;margin-bottom:20px;color:var(--text-color)}.welcome-title{font-size:2.6rem;font-weight:900;color:#1e293b;line-height:1.1;margin-bottom:2rem;display:flex;flex-direction:column;letter-spacing:-.02em}.welcome-subtitle{font-size:1.15rem;font-weight:500;color:#334155;margin-bottom:.8rem;letter-spacing:normal;text-transform:none}.gradient-text{background:linear-gradient(-45deg,#3b82f6,#4f46e5,#1e293b,#4f46e5,#3b82f6);background-size:400% 400%;-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;animation:gradient-shimmer 8s ease infinite}@keyframes gradient-shimmer{0%{background-position:0% 50%}50%{background-position:100% 50%}to{background-position:0% 50%}}.login-card{width:100%;max-width:1100px;display:flex;align-items:center;border-radius:0;overflow:visible;box-shadow:none;background:transparent}.login-info-panel{flex:1.2;padding:60px;background:transparent;display:flex;flex-direction:column;justify-content:center}.login-form-panel{flex:1;padding:40px 60px;background:#fff;border-radius:24px;box-shadow:0 40px 80px -12px #00000026;display:flex;flex-direction:column;justify-content:center;border:1px solid #F1F5F9;align-self:center}@media(max-width:900px){.login-card{flex-direction:column}.login-info-panel,.login-form-panel{padding:40px}.login-form-panel{border-left:none;border-top:1px solid #F1F5F9}}.info-pills-row{cursor:pointer}.info-pill-item{display:flex;align-items:center;background:#fff;padding:10px 15px;border-radius:12px;box-shadow:0 4px 6px -1px #0000001a;transition:transform .2s;border:1px solid #E2E8F0;flex:1}.info-pill-item:hover{transform:translateY(-3px);box-shadow:0 10px 15px -3px #0000001a}.pill-icon-box{width:40px;height:40px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:1.2em;margin-right:12px;flex-shrink:0}.pill-text-box{display:flex;flex-direction:column}.pill-text-box strong{font-size:.9em;color:#1e293b}.pill-text-box span{font-size:.8em;color:#64748b}.auth-modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:2000;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);padding:20px}.auth-modal-content{background:#fff;width:100%;max-width:500px;border-radius:16px;overflow:hidden;box-shadow:0 20px 25px -5px 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5px;font-size:1.4em;color:#064e3b;font-weight:800}.contact-slogan{color:#065f46;font-size:.95em;opacity:.8}.contact-link-pill{background:#fff;padding:10px 15px;border-radius:25px;display:flex;align-items:center;gap:10px;box-shadow:0 2px 4px #0000000d}.pill-icon{width:20px;text-align:center}.pill-label{background:#3b82f6;color:#fff;padding:2px 6px;border-radius:4px;font-size:.65em;font-weight:900}.pill-value{font-size:.9em;color:#1e293b;font-weight:600}body[data-theme=dark] .login-page{background:#0f172a}body[data-theme=dark] .login-card{background:transparent;border:none}body[data-theme=dark] .login-info-panel{background:transparent}body[data-theme=dark] .login-form-panel{background:#1e293b;border-color:#334155}body[data-theme=dark] .login-form-panel .btn-outline{color:#cbd5e1!important;border-color:#475569!important}body[data-theme=dark] .info-pills-row{display:flex;gap:15px}body[data-theme=dark] 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.intro-text{color:#f1f5f9!important}body[data-theme=dark] .contact-link-pill{background:#334155}body[data-theme=dark] .pill-value{color:#f1f5f9}body[data-theme=dark] .help-desc strong,body[data-theme=dark] .help-desc p{color:#f1f5f9!important}body[data-theme=dark] .welcome-title{color:#f1f5f9}body[data-theme=dark] .welcome-subtitle{color:#cbd5e1}body[data-theme=dark] .gradient-text{background:linear-gradient(to right,#60a5fa,#818cf8,#f1f5f9);-webkit-background-clip:text;background-clip:text}.theme-toggle-btn{background:var(--surface-color);border:1px solid var(--border-color);border-radius:50%;width:40px;height:40px;display:flex;justify-content:center;align-items:center;font-size:1.2rem;cursor:pointer;transition:background-color .2s,transform .2s;color:var(--text-color)}.theme-toggle-btn:hover{transform:scale(1.1);background-color:var(--secondary-color)}.btn{padding:8px 16px;border:none;border-radius:4px;cursor:pointer;font-size:1em;font-weight:500;transition:background-color .2s,box-shadow .2s,transform .2s;background-color:var(--secondary-color);color:var(--primary-color-dark)}body[data-theme=dark] .btn{color:var(--text-color);background-color:var(--secondary-color)}.btn:hover{box-shadow:0 2px 5px #00000026;filter:brightness(.95);transform:translateY(-1px)}.btn.btn-primary{background-color:var(--primary-color);color:#fff}.btn.btn-primary:hover{background-color:var(--primary-color-dark)}.btn.btn-large{padding:12px 24px;font-size:1.2em}.btn.btn-danger{background-color:#fee2e2;color:#dc2626}body[data-theme=dark] .btn.btn-danger{background-color:#dc262633;color:var(--error-color)}.btn.btn-danger:hover{background-color:#fecaca}body[data-theme=dark] .btn.btn-danger:hover{background-color:#dc26264d}.btn:disabled{background-color:var(--border-color);cursor:not-allowed;color:var(--text-muted);box-shadow:none;transform:none}.btn-sm{padding:4px 8px;font-size:.8em;margin-left:5px}.data-table{width:100%;border-collapse:collapse}.data-table th,.data-table 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tr.selected{background-color:var(--primary-color)!important;color:#fff}.table-wrapper{overflow-x:auto}.loading-container,.error-container{display:flex;flex-direction:column;justify-content:center;align-items:center;min-height:100vh}.error-message{color:var(--error-color);text-align:center;margin-bottom:15px}.success-message{color:var(--success-color);background-color:var(--result-banner-pass-bg);padding:10px;border-radius:4px;text-align:center;margin-bottom:15px;border:1px solid var(--success-color);white-space:pre-wrap;word-break:break-word}.error-container p{max-width:600px;text-align:center;line-height:1.5;margin:10px 20px}.error-container button{margin-top:20px}.modal-backdrop{position:fixed;top:0;left:0;width:100%;height:100%;background-color:#0f172ab3;display:flex;justify-content:center;align-items:center;z-index:1000;animation:fadeIn .3s ease-out 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#0000001a;padding:2rem}.login-form{background:transparent;padding:0;box-shadow:none;border-radius:0;width:100%;max-width:450px}.login-form.registration-form{max-width:500px;background:var(--surface-color);padding:40px;border-radius:8px;box-shadow:0 4px 10px #0000001a}.login-form h2{text-align:center;margin-bottom:25px;color:var(--primary-color-dark);font-weight:700;font-size:1.8em}.input-group{margin-bottom:25px}.input-group label{display:block;margin-bottom:5px;font-weight:500}.input-group input{width:100%;padding:10px;border:1px solid var(--border-color);border-radius:4px;box-sizing:border-box;background-color:var(--surface-color);color:var(--text-color);transition:border-color .2s,box-shadow .2s}.input-group input:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #4f46e533}.remember-me-wrapper{margin-bottom:20px;display:flex;align-items:center}.remember-me-label{display:flex;align-items:center;gap:8px;cursor:pointer;font-size:.95rem;color:var(--text-color);-webkit-user-select:none;user-select:none}.remember-me-label input{width:18px;height:18px;margin:0;cursor:pointer;accent-color:var(--primary-color)}.login-form button[type=submit]{width:100%;padding:12px;font-size:1.1rem;margin-top:10px}.login-form>h2,.login-form .input-group,.login-form button[type=submit]{opacity:0;animation:slideUp .5s ease-out forwards}.login-form>h2{animation-delay:.1s}.login-form .input-group:nth-of-type(1){animation-delay:.2s}.login-form .input-group:nth-of-type(2){animation-delay:.3s}.login-form button[type=submit]{animation-delay:.4s}@media(max-width:1024px){.login-card{grid-template-columns:1fr;max-width:500px;gap:30px}.login-info-panel{text-align:center;padding:2rem 1rem}.welcome-title{font-size:2rem}.welcome-subtitle{font-size:1.5rem}}@media(max-width:600px){.login-container{padding:1rem}.login-form-container{padding:1.5rem}.welcome-title{font-size:1.6rem}.welcome-subtitle{font-size:1.2rem}}.student-view-container{display:flex;flex-direction:column;min-height:100vh;background-color:var(--background-color);font-family:Inter,sans-serif;font-size:1.2rem;transition:background-color .3s}.student-view-header{background-color:var(--surface-color);color:var(--text-color);padding:15px 25px;display:flex;justify-content:space-between;align-items:center;box-shadow:0 1px 4px #0000001a;z-index:20;position:sticky;top:0;border-bottom:1px solid var(--border-color)}.student-view-header h1{margin:0;font-size:1.15em;font-weight:700;color:var(--primary-color);text-transform:uppercase;letter-spacing:.5px;flex-shrink:0}.student-header-actions{display:flex;align-items:center;gap:15px}.header-user-name{font-weight:600;color:var(--text-color-secondary);font-size:.9em}.btn-logout{background-color:#f59e0b;color:#fff;border:none;padding:8px 18px;border-radius:8px;font-weight:600;cursor:pointer;font-size:.85em;transition:all .2s;flex-shrink:0}.btn-logout:hover{background-color:#d97706;transform:translateY(-1px)}.student-welcome-banner{background:linear-gradient(135deg,#eef2ff,#e0e7ff);color:#312e81;padding:50px 20px 80px;text-align:center;border-bottom-left-radius:35px;border-bottom-right-radius:35px;position:relative;overflow:hidden}body[data-theme=dark] .student-welcome-banner{background:linear-gradient(135deg,#1e1b4b,#312e81);color:#eef2ff}.welcome-content h2{font-size:2.4em;font-weight:800;margin:0 0 12px;letter-spacing:-.5px}.welcome-content 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