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.2s,transform .2s cubic-bezier(.34,1.56,.64,1);box-shadow:0 4px 20px #0000000f}.class-card:hover{border-color:var(--color-primary);box-shadow:0 12px 40px #6366f124;transform:translateY(-2px)}.class-card-main{display:flex;flex-direction:column;gap:var(--space-2)}.class-card-name{font-size:1.125rem;font-weight:600;color:var(--color-text)}.class-card-meta{display:flex;align-items:center;gap:var(--space-3)}.class-code-badge{display:inline-block;padding:var(--space-1) var(--space-3);background:var(--color-primary-light);color:var(--color-primary);border-radius:var(--radius-sm);font-size:.875rem;font-weight:700;letter-spacing:.1em;font-family:var(--font-mono)}.class-code-badge--large{font-size:1.25rem;padding:var(--space-2) var(--space-4);letter-spacing:.2em}.class-student-count{font-size:.875rem;color:var(--color-text-muted)}.create-class-card{background:#fff;border:1.5px solid var(--color-primary);border-radius:var(--radius-xl);padding:var(--space-6);box-shadow:0 8px 30px #6366f11f;animation:slideIn .2s ease-out}.create-class-form{display:flex;flex-direction:column;gap:var(--space-4)}.create-class-actions{display:flex;gap:var(--space-3);flex-wrap:wrap}.class-detail-code-row{display:flex;align-items:center;gap:var(--space-3);margin-top:var(--space-3);flex-wrap:wrap}.detail-label{font-size:.875rem;font-weight:600;color:var(--color-text-muted)}.detail-hint{font-size:.875rem;color:var(--color-text-muted)}.student-table-wrapper{overflow-x:auto;border-radius:var(--radius-xl);border:1.5px solid var(--color-border);box-shadow:var(--shadow-sm)}.student-table{width:100%;border-collapse:collapse;background:var(--color-surface)}.student-table th{padding:var(--space-3) var(--space-5);text-align:left;font-size:.8125rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--color-text-muted);background:var(--color-surface-alt);border-bottom:1.5px solid var(--color-border)}.student-table td{padding:var(--space-4) var(--space-5);font-size:.9375rem;color:var(--color-text);border-bottom:1px solid var(--color-border)}.student-table tr:last-child td{border-bottom:none}.student-name-cell{font-weight:600}.td-center{text-align:center;color:var(--color-text-muted)}.score-na{color:var(--color-text-light);font-size:.875rem}.score-num{font-size:.8125rem;color:var(--color-text-muted);margin-left:var(--space-2)}.practice-card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:var(--space-4)}.practice-card{display:flex;flex-direction:column;align-items:flex-start;gap:var(--space-2);padding:var(--space-6);background:#fff;border:1.5px solid var(--color-border);border-radius:var(--radius-xl);cursor:pointer;text-align:left;transition:border-color .2s,box-shadow .2s,transform .2s cubic-bezier(.34,1.56,.64,1);box-shadow:0 4px 20px #0000000f;position:relative}.practice-card:hover{border-color:var(--color-primary);box-shadow:0 12px 40px #6366f124;transform:translateY(-3px)}.practice-card-icon{font-size:1.5rem;font-weight:800;color:var(--color-primary);font-family:var(--font-mono);margin-bottom:var(--space-1)}.practice-card strong{font-size:1.0625rem;font-weight:700;color:var(--color-text)}.practice-card span:not(.practice-card-icon):not(.practice-card-arrow){font-size:.875rem;color:var(--color-text-muted);line-height:1.4}.practice-card--student{padding:var(--space-8) var(--space-6);min-height:180px}.practice-card-icon-large{font-size:2.25rem;font-weight:800;color:var(--color-primary);font-family:var(--font-mono);margin-bottom:var(--space-2)}.practice-card-gear{position:absolute;top:var(--space-3);right:var(--space-3);display:flex;align-items:center;justify-content:center;width:30px;height:30px;background:none;border:none;border-radius:var(--radius-md);color:var(--color-text-light);cursor:pointer;opacity:0;transition:opacity .15s,color .15s,background .15s}.practice-card:hover 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#0000000d}.student-welcome-title{font-size:2rem;font-weight:800;letter-spacing:-.03em;background:var(--gradient-brand);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.student-welcome-sub{font-size:1rem;color:var(--color-text-muted);margin-top:var(--space-1)}.student-stats-section{display:flex;flex-direction:column}.stats-card{display:flex;align-items:center;background:#fff;border:1.5px solid var(--color-border);border-left:3px solid #7c3aed;border-radius:var(--radius-xl);padding:var(--space-5) var(--space-6);gap:var(--space-6);box-shadow:0 4px 20px #0000000f;flex-wrap:wrap}.stat-item{display:flex;flex-direction:column;align-items:center;gap:var(--space-1);flex:1;min-width:80px}.stat-value{font-size:1.75rem;font-weight:700;color:var(--color-primary)}.stat-label{font-size:.75rem;font-weight:600;color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.06em;text-align:center}.stat-divider{width:1px;height:48px;background:var(--color-border);flex-shrink:0}.landing{min-height:100dvh;background:linear-gradient(145deg,#eef2ff,#faf5ff 40%,#eff6ff);display:flex;align-items:center;justify-content:center;padding:var(--space-8) var(--space-6);position:relative;overflow:hidden}.landing:before,.landing:after{content:"";position:absolute;border-radius:50%;filter:blur(80px);opacity:.35;pointer-events:none}.landing:before{width:500px;height:500px;background:radial-gradient(circle,#818cf8,#c084fc);top:-120px;left:-100px}.landing:after{width:400px;height:400px;background:radial-gradient(circle,#38bdf8,#818cf8);bottom:-80px;right:-80px}.landing-inner{max-width:680px;width:100%;display:flex;flex-direction:column;align-items:center;gap:var(--space-10);position:relative;z-index:1}.landing-hero{text-align:center;display:flex;flex-direction:column;align-items:center;gap:var(--space-4)}.landing-logo{width:140px;height:140px;background:#fff;border-radius:36px;display:flex;align-items:center;justify-content:center;box-shadow:0 8px 32px #6366f133,0 2px 8px #00000014;animation:logo-float 3s ease-in-out infinite}@keyframes logo-float{0%,to{transform:translateY(0)}50%{transform:translateY(-6px)}}.landing-logo-icon{display:block}.landing-title{font-size:clamp(2.5rem,8vw,4rem);font-weight:900;letter-spacing:-.04em;line-height:1;background:linear-gradient(135deg,#4f46e5,#7c3aed,#0ea5e9);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.landing-tagline{font-size:1.125rem;color:var(--color-text-muted);line-height:1.6;max-width:460px}.landing-tagline strong{color:var(--color-text)}.landing-cta-grid{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-4);width:100%}.landing-cta-card{display:flex;flex-direction:column;align-items:center;gap:var(--space-3);padding:var(--space-8) var(--space-6);background:#fff;border:2px solid transparent;border-radius:20px;cursor:pointer;text-align:center;transition:all .2s cubic-bezier(.34,1.56,.64,1);box-shadow:0 4px 20px #00000012}.landing-cta-card:hover{box-shadow:0 12px 40px #6366f12e;transform:translateY(-4px) scale(1.02)}.landing-cta-student:hover{border-color:var(--color-primary)}.landing-cta-teacher:hover{border-color:#0ea5e9}.landing-cta-emoji{font-size:2.5rem;line-height:1}.landing-cta-card strong{font-size:1.125rem;font-weight:700;color:var(--color-text)}.landing-cta-card span{font-size:.875rem;color:var(--color-text-muted);line-height:1.4}.landing-features{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:var(--space-3);width:100%}.landing-feature{display:flex;align-items:flex-start;gap:var(--space-3);font-size:.9rem;color:var(--color-text-muted);background:#fff;border-radius:var(--radius-lg);padding:var(--space-3) var(--space-4);box-shadow:0 2px 8px #0000000a}.landing-feature strong{color:var(--color-text)}.landing-feature-icon{flex-shrink:0;font-size:1.25rem;line-height:1.4}.landing-footer-note{font-size:.8rem;color:var(--color-text-light);letter-spacing:.05em}.empty-state{display:flex;flex-direction:column;align-items:center;gap:var(--space-4);padding:var(--space-12) var(--space-6);text-align:center;color:var(--color-text-muted)}.empty-state-icon{color:var(--color-text-light)}.empty-hint{font-size:.875rem}.page-loading{padding:var(--space-8);text-align:center;color:var(--color-text-muted);font-size:.9375rem}.practice-header-left{display:flex;align-items:center;gap:var(--space-4)}@media(max-width:640px){.page-header-inner{padding:var(--space-3) var(--space-4)}.page-main{padding:var(--space-6) var(--space-4)}.landing-cta-grid,.landing-features{grid-template-columns:1fr}.landing-inner{gap:var(--space-8)}.auth-card{padding:var(--space-6)}.student-table th,.student-table td{padding:var(--space-3) var(--space-4)}.stats-card{flex-direction:column;gap:var(--space-4)}.stat-divider{width:100%;height:1px}.dashboard-title-row{flex-direction:column;align-items:flex-start}.class-detail-code-row{flex-wrap:wrap}.practice-header-left{flex-direction:column;align-items:flex-start;gap:var(--space-1)}}.toggle-row{display:flex;align-items:center;justify-content:space-between;gap:var(--space-4);padding:var(--space-3) 0;border-top:1px solid var(--color-border);border-bottom:1px solid var(--color-border);margin:var(--space-2) 0}.toggle-row--inline{border:none;padding:0;margin:0}.toggle-label{display:flex;flex-direction:column;gap:2px;font-size:.9375rem;font-weight:500;color:var(--color-text);cursor:default}.toggle-hint{font-size:.8125rem;font-weight:400;color:var(--color-text-muted)}.toggle-switch{position:relative;width:44px;height:26px;border-radius:9999px;border:none;cursor:pointer;flex-shrink:0;transition:background .2s;padding:0}.toggle-switch.on{background:var(--color-primary)}.toggle-switch.off{background:var(--color-border-strong)}.toggle-knob{position:absolute;top:3px;width:20px;height:20px;border-radius:50%;background:#fff;box-shadow:0 1px 3px #0003;transition:left .2s}.toggle-switch.on .toggle-knob{left:21px}.toggle-switch.off .toggle-knob{left:3px}.enrollment-badge{display:inline-block;padding:2px var(--space-2);border-radius:9999px;font-size:.75rem;font-weight:600}.enrollment-badge--closed{background:var(--color-error-light);color:var(--color-error)}.class-detail-actions{display:flex;align-items:center;gap:var(--space-4);flex-wrap:wrap}.btn-pin-reset{background:none;border:1px solid var(--color-border-strong);border-radius:var(--radius-sm);padding:var(--space-1) var(--space-3);font-size:.8125rem;color:var(--color-text-muted);cursor:pointer;white-space:nowrap;transition:all .15s}.btn-pin-reset:hover{border-color:var(--color-primary);color:var(--color-primary)}.pin-reset-row td{background:var(--color-surface-alt);padding:var(--space-2) var(--space-4)}.pin-reset-form{display:flex;align-items:center;gap:var(--space-3);flex-wrap:wrap}.pin-reset-label{font-size:.875rem;color:var(--color-text-muted)}.pin-reset-input{width:90px;padding:var(--space-2) var(--space-3);border:1.5px solid var(--color-border);border-radius:var(--radius-md);font-size:1rem;font-family:var(--font-mono);text-align:center;letter-spacing:.15em;outline:none}.pin-reset-input:focus{border-color:var(--color-primary)}.btn-sm{padding:var(--space-2) var(--space-4);font-size:.875rem;min-height:36px}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000073;display:flex;align-items:center;justify-content:center;z-index:200;padding:var(--space-4)}.modal-card{background:var(--color-surface);border-radius:var(--radius-xl);padding:var(--space-8);width:100%;max-width:420px;box-shadow:var(--shadow-lg)}.modal-title{font-size:1.25rem;font-weight:700;margin-bottom:var(--space-5);color:var(--color-text)}.modal-close-btn{width:100%;margin-top:var(--space-3);text-align:center;justify-content:center}.auth-success{background:var(--color-success-light);border:1px solid var(--color-success-border);color:var(--color-success);border-radius:var(--radius-md);padding:var(--space-3) var(--space-4);font-size:.9375rem;margin-bottom:var(--space-3)}.auth-link-btn{background:none;border:none;color:var(--color-primary);font-size:.9375rem;cursor:pointer;text-decoration:underline;padding:0}.auth-link-btn:hover{color:var(--color-primary-hover)}.btn-copy-link{display:inline-flex;align-items:center;gap:var(--space-2);padding:var(--space-2) var(--space-3);background:var(--color-surface);border:1.5px solid var(--color-border-strong);border-radius:var(--radius-md);font-size:.875rem;font-weight:500;color:var(--color-text-muted);cursor:pointer;transition:all .15s;white-space:nowrap}.btn-copy-link:hover{border-color:var(--color-primary);color:var(--color-primary)}.btn-copy-link:has(svg:first-child path[points]){border-color:var(--color-success);color:var(--color-success)}.btn-danger{display:inline-flex;align-items:center;gap:var(--space-2);padding:var(--space-3) var(--space-5);background:var(--color-error-light);color:var(--color-error);border:1.5px solid 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var(--space-4);margin-bottom:var(--space-2);background:var(--color-surface);border:1.5px solid var(--color-border);border-radius:var(--radius-lg);cursor:pointer;text-align:left;transition:border-color .15s,background .15s}.recent-class-card:hover{border-color:var(--color-primary);background:var(--color-primary-light, #eff6ff)}.recent-class-info{display:flex;flex-direction:column;gap:2px}.recent-class-name{font-size:.9375rem;font-weight:600;color:var(--color-text)}.recent-class-meta{font-size:.8125rem;color:var(--color-text-muted)}.form-group{display:flex;flex-direction:column;gap:var(--space-2);margin-bottom:var(--space-3)}.form-label{font-size:.8125rem;font-weight:600;color:var(--color-text)}.form-input{padding:var(--space-2) var(--space-3);border:1.5px solid var(--color-border);border-radius:var(--radius-md);font-size:.9375rem;color:var(--color-text);background:var(--color-surface);outline:none;min-height:40px;transition:border-color .15s,box-shadow .15s;font-family:var(--font-sans)}.form-input:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px #4f46e51a}.form-input[type=number]{font-family:var(--font-mono)}select.form-input{cursor:pointer}.admin-header-badge{display:inline-flex;align-items:center;gap:var(--space-2);font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:var(--color-primary);background:var(--color-primary-light);border:1px solid rgba(79,70,229,.2);border-radius:var(--radius-sm);padding:2px var(--space-2)}.admin-tab-panel{background:var(--color-surface);border:1.5px solid var(--color-border);border-radius:0 var(--radius-lg) var(--radius-lg) var(--radius-lg);padding:var(--space-6);box-shadow:var(--shadow-sm)}.admin-table-wrap{overflow-x:auto;border-radius:var(--radius-lg);border:1.5px solid var(--color-border)}.admin-table{width:100%;border-collapse:collapse;font-size:.9375rem;background:var(--color-surface)}.admin-table th{text-align:left;padding:var(--space-3) var(--space-4);background:var(--color-surface-alt);color:var(--color-text-muted);font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;border-bottom:1.5px solid var(--color-border);white-space:nowrap}.admin-table td{padding:var(--space-3) var(--space-4);border-bottom:1px solid var(--color-border);color:var(--color-text);vertical-align:middle;font-size:.9rem}.admin-table tbody tr:last-child td{border-bottom:none}.admin-table tbody tr:hover td{background:color-mix(in srgb,var(--color-primary) 3%,var(--color-surface))}.admin-tabs{display:flex;flex-wrap:wrap;gap:0;border-bottom:1.5px solid var(--color-border);padding-bottom:0}.admin-tab{display:inline-flex;align-items:center;gap:var(--space-2);padding:var(--space-3) var(--space-4);background:none;border:1.5px solid transparent;border-bottom:none;margin-bottom:-1.5px;font-size:.875rem;font-weight:500;color:var(--color-text-muted);cursor:pointer;transition:color .15s,background .15s,border-color .15s;border-radius:var(--radius-sm) var(--radius-sm) 0 0}.admin-tab:hover{color:var(--color-text);background:var(--color-surface-alt)}.admin-tab.active{color:var(--color-primary);font-weight:600;background:var(--color-surface);border-color:var(--color-border);border-bottom-color:var(--color-surface)}.admin-tab-count{display:inline-flex;align-items:center;justify-content:center;min-width:20px;padding:0 var(--space-2);height:18px;background:var(--color-border);color:var(--color-text-muted);border-radius:9999px;font-size:.7rem;font-weight:700}.admin-tab.active .admin-tab-count{background:var(--color-primary-light);color:var(--color-primary)}.admin-loading{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-10) 0;color:var(--color-text-muted);font-size:.9375rem}.admin-loading:before{content:"";display:block;width:18px;height:18px;border:2px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;animation:spin .7s linear 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