*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--color-bg:#eef2ff;--gradient-brand:linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #0ea5e9 100%);--color-surface:#fff;--color-surface-alt:#f8fafc;--color-border:#e2e8f0;--color-border-strong:#cbd5e1;--color-primary:#4f46e5;--color-primary-hover:#4338ca;--color-primary-light:#eef2ff;--color-success:#16a34a;--color-success-light:#dcfce7;--color-success-border:#86efac;--color-warning:#d97706;--color-warning-light:#fef3c7;--color-warning-border:#fcd34d;--color-error:#dc2626;--color-error-light:#fee2e2;--color-error-border:#fca5a5;--color-text:#1e293b;--color-text-muted:#64748b;--color-text-light:#94a3b8;--space-1:.25rem;--space-2:.5rem;--space-3:.75rem;--space-4:1rem;--space-5:1.25rem;--space-6:1.5rem;--space-8:2rem;--space-10:2.5rem;--space-12:3rem;--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-mono:"Courier New", "Courier", monospace;--radius-sm:.375rem;--radius-md:.5rem;--radius-lg:.75rem;--radius-xl:1rem;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a, 0 2px 4px -2px #0000001a;--shadow-lg:0 10px 15px -3px #0000001a, 0 4px 6px -4px #0000001a}html,body{height:100%;font-family:var(--font-sans);color:var(--color-text);background:var(--color-bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@keyframes pageEnter{0%{opacity:0;transform:translateY(18px)scale(.98)}to{opacity:1;transform:translateY(0)scale(1)}}@keyframes itemEnter{0%{opacity:0;transform:translateY(14px)}to{opacity:1;transform:translateY(0)}}.page-layout{animation:.45s cubic-bezier(.22,1,.36,1) both pageEnter}.page-main>*{animation:.4s cubic-bezier(.22,1,.36,1) both itemEnter}.page-main>:first-child{animation-delay:40ms}.page-main>:nth-child(2){animation-delay:90ms}.page-main>:nth-child(3){animation-delay:.14s}.page-main>:nth-child(4){animation-delay:.18s}.page-main>:nth-child(n+5){animation-delay:.22s}@keyframes vtSlideOut{to{opacity:0;transform:scale(.96)translateY(-10px)}}@keyframes vtSlideIn{0%{opacity:0;transform:scale(.96)translateY(14px)}}::view-transition-old(root){animation:.25s ease-in vtSlideOut}::view-transition-new(root){animation:.4s cubic-bezier(.22,1,.36,1) vtSlideIn}@media (prefers-reduced-motion:reduce){.page-layout,.page-main>*{animation:none}::view-transition-old(root){animation:none}::view-transition-new(root){animation:none}}body:has(.app){overflow:hidden}#root{height:100%}.app{background:linear-gradient(145deg,#eef2ff 0%,#faf5ff 40%,#eff6ff 100%);flex-direction:column;max-width:1400px;height:100dvh;margin:0 auto;display:flex;overflow:hidden}.top-panel{gap:var(--space-2);padding:var(--space-3) var(--space-3) var(--space-2);-webkit-backdrop-filter:blur(12px);z-index:10;background:#ffffffd1;border-bottom:1.5px solid #e2e8f099;flex-direction:column;flex-shrink:0;display:flex}.scroll-area{-webkit-overflow-scrolling:touch;padding:0 var(--space-3) var(--space-3);gap:var(--space-3);flex-direction:column;flex:1;display:flex;overflow:hidden auto}.app-header{justify-content:space-between;align-items:center;gap:var(--space-4);flex-wrap:wrap;display:flex}.app-title{letter-spacing:-.03em;background:var(--gradient-brand);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-size:1.5rem;font-weight:800}.app-title span{color:var(--color-text-muted);letter-spacing:0;-webkit-text-fill-color:var(--color-text-muted);font-size:.9rem;font-weight:400;display:block}.settings-toggle{align-items:center;gap:var(--space-2);padding:var(--space-2) var(--space-4);background:var(--color-surface);border:1.5px solid var(--color-border);border-radius:var(--radius-md);color:var(--color-text-muted);cursor:pointer;min-height:44px;font-size:.875rem;font-weight:500;transition:border-color .15s,color .15s;display:flex}.settings-toggle:hover{border-color:var(--color-primary);color:var(--color-primary)}.settings-toggle.has-key{border-color:var(--color-success);color:var(--color-success)}.settings-panel{background:var(--color-surface);border:1.5px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-5);box-shadow:var(--shadow-md)}.settings-panel h3{margin-bottom:var(--space-4);color:var(--color-text);font-size:1rem;font-weight:600}.settings-field{gap:var(--space-2);flex-direction:column;display:flex}.settings-field label{color:var(--color-text-muted);font-size:.875rem;font-weight:500}.settings-field .input-row{gap:var(--space-2);display:flex}.settings-field input{padding:var(--space-3) var(--space-4);border:1.5px solid var(--color-border);border-radius:var(--radius-md);font-size:.875rem;font-family:var(--font-mono);color:var(--color-text);background:var(--color-surface-alt);outline:none;flex:1;min-height:44px;transition:border-color .15s}.settings-field input:focus{border-color:var(--color-primary);background:var(--color-surface)}.btn-save{padding:var(--space-3) var(--space-5);background:var(--color-primary);color:#fff;border-radius:var(--radius-md);cursor:pointer;white-space:nowrap;border:none;min-height:44px;font-size:.875rem;font-weight:600;transition:background .15s}.btn-save:hover{background:var(--color-primary-hover)}.key-status{padding:var(--space-1) 0;font-size:.8125rem}.key-status.saved{color:var(--color-success)}.key-status.empty{color:var(--color-text-muted)}.problem-section{background:var(--color-surface);border:1.5px solid var(--color-border);border-radius:var(--radius-xl);padding:var(--space-4) var(--space-6);justify-content:space-between;align-items:center;gap:var(--space-4);box-shadow:var(--shadow-sm);flex-wrap:wrap;display:flex}.problem-content{gap:var(--space-2);flex-direction:column;display:flex}.problem-label{text-transform:uppercase;letter-spacing:.08em;color:var(--color-text-muted);font-size:.8125rem;font-weight:600}.problem-type-badge{padding:var(--space-1) var(--space-3);background:var(--color-primary-light);color:var(--color-primary);letter-spacing:.04em;border-radius:9999px;font-size:.75rem;font-weight:600;display:inline-block}.problem-expression{font-size:clamp(1.5rem,5vw,3.5rem);font-weight:700;font-family:var(--font-mono);color:var(--color-text);letter-spacing:-.01em;line-height:1.1}.problem-expression--word{font-size:1.125rem;font-weight:500;font-family:var(--font-sans);letter-spacing:0;line-height:1.6}.triangle-diagram{margin:.5rem 0;line-height:0}.problem-actions{align-items:center;gap:var(--space-3);display:flex}.btn-label-short{display:none}.btn-label-long{display:inline}.btn-new-problem{align-items:center;gap:var(--space-2);padding:var(--space-3) var(--space-6);background:var(--color-surface);border:1.5px solid var(--color-border-strong);border-radius:var(--radius-lg);color:var(--color-text);cursor:pointer;min-height:52px;font-size:1rem;font-weight:600;transition:all .15s;display:flex}.btn-new-problem:hover{border-color:var(--color-primary);color:var(--color-primary);background:var(--color-primary-light)}.canvas-section{background:var(--color-surface);border:1.5px solid var(--color-border);border-radius:var(--radius-xl);box-shadow:var(--shadow-sm);flex-direction:column;flex-shrink:0;min-height:max(60vh,500px);display:flex;overflow:hidden}.canvas-toolbar{align-items:center;gap:var(--space-3);padding:var(--space-3) var(--space-4);border-bottom:1.5px solid var(--color-border);background:var(--color-surface-alt);-webkit-user-select:none;user-select:none;-webkit-touch-callout:none;flex-wrap:wrap;display:flex}.toolbar-group{align-items:center;gap:var(--space-1);display:flex}.toolbar-divider{background:var(--color-border);width:1px;height:28px;margin:0 var(--space-1)}.toolbar-label{color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.06em;padding:0 var(--space-1);font-size:.75rem;font-weight:600}.tb-dropdown{position:relative}.tb-dropdown-menu{z-index:60;background:var(--color-surface);border:1.5px solid var(--color-border);border-radius:var(--radius-md);flex-direction:column;align-items:center;gap:2px;min-width:44px;padding:4px;display:flex;position:absolute;top:calc(100% + 6px);left:50%;transform:translate(-50%);box-shadow:0 4px 20px #00000026}.tool-btn{border-radius:var(--radius-md);cursor:pointer;width:40px;height:40px;color:var(--color-text-muted);touch-action:manipulation;-webkit-touch-callout:none;background:0 0;border:1.5px solid #0000;justify-content:center;align-items:center;font-size:1.125rem;transition:all .15s;display:flex}.tool-btn:hover{background:var(--color-border);color:var(--color-text)}.tool-btn.active{background:var(--color-primary-light);border-color:var(--color-primary);color:var(--color-primary)}.tool-btn.danger:hover{background:var(--color-error-light);border-color:var(--color-error);color:var(--color-error)}.color-swatch{cursor:pointer;touch-action:manipulation;-webkit-touch-callout:none;border:2.5px solid #0000;border-radius:50%;outline:none;flex-shrink:0;width:24px;height:24px;transition:transform .15s,border-color .15s}.color-swatch:hover{transform:scale(1.15)}.color-swatch.active{border-color:var(--color-text);box-shadow:0 0 0 2px var(--color-surface), 0 0 0 4px var(--color-text);transform:scale(1.15)}.stroke-btn{border-radius:var(--radius-md);cursor:pointer;touch-action:manipulation;-webkit-touch-callout:none;background:0 0;border:1.5px solid #0000;justify-content:center;align-items:center;width:40px;height:40px;transition:all .15s;display:flex}.stroke-btn:hover{background:var(--color-border)}.stroke-btn.active{background:var(--color-primary-light);border-color:var(--color-primary)}.stroke-btn .stroke-preview{background:var(--color-text);border-radius:9999px;width:20px}.canvas-wrapper{cursor:crosshair;touch-action:none;flex:1;position:relative;overflow:hidden}.canvas-wrapper.eraser-mode{cursor:cell}canvas{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none;-webkit-tap-highlight-color:transparent;width:100%;height:100%;min-height:max(60vh,500px);display:block}.submit-section{justify-content:center;align-items:center;gap:var(--space-4);padding:var(--space-1) 0;flex-shrink:0;display:flex}.btn-hint{align-items:center;gap:var(--space-2);padding:var(--space-3) var(--space-5);background:var(--color-surface);color:var(--color-warning,#b45309);border:1.5px solid var(--color-warning,#b45309);border-radius:var(--radius-lg);cursor:pointer;white-space:nowrap;min-height:52px;font-size:1rem;font-weight:600;transition:all .15s;display:flex}.btn-hint:hover:not(:disabled){box-shadow:var(--shadow-md);background:#fef3c7}.btn-hint:disabled{opacity:.55;cursor:not-allowed}.btn-hint .spinner{border:2.5px solid #b453094d;border-top-color:#b45309;border-radius:50%;width:18px;height:18px;animation:.7s linear infinite spin}.hint-panel{border-radius:var(--radius-lg);background:#fffbeb;border:1.5px solid #fcd34d;align-items:flex-start;gap:.5rem;margin-top:.625rem;padding:.625rem .875rem;display:flex}.hint-panel__icon{flex-shrink:0;font-size:1rem;line-height:1.5}.hint-panel__text{color:#78350f;margin:0;font-size:.9375rem;line-height:1.55}.btn-submit{align-items:center;gap:var(--space-2);padding:var(--space-3) var(--space-6);background:var(--color-primary);color:#fff;border-radius:var(--radius-lg);cursor:pointer;min-height:52px;box-shadow:var(--shadow-md);letter-spacing:.01em;white-space:nowrap;border:none;font-size:1rem;font-weight:600;transition:all .15s;display:flex}.btn-submit:hover:not(:disabled){background:var(--color-primary-hover);box-shadow:var(--shadow-lg);transform:translateY(-1px)}.btn-submit:disabled{opacity:.55;cursor:not-allowed;box-shadow:none;transform:none}.btn-submit .spinner{border:2.5px solid #ffffff59;border-top-color:#fff;border-radius:50%;flex-shrink:0;width:20px;height:20px;animation:.7s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.feedback-panel{background:var(--color-surface);border:1.5px solid var(--color-border);border-radius:var(--radius-xl);box-shadow:var(--shadow-sm);animation:.3s ease-out slideIn;overflow:hidden}@keyframes slideIn{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.feedback-panel.correct{border-color:var(--color-success-border);background:linear-gradient(to bottom, var(--color-success-light), var(--color-surface))}.feedback-panel.needs-work{border-color:var(--color-warning-border);background:linear-gradient(to bottom, var(--color-warning-light), var(--color-surface))}.feedback-panel.error{border-color:var(--color-error-border);background:linear-gradient(to bottom, var(--color-error-light), var(--color-surface))}.feedback-panel.loading{padding:var(--space-3) var(--space-5) var(--space-4)}.feedback-header{align-items:center;gap:var(--space-3);display:flex}.feedback-summary{align-items:center;gap:var(--space-3);width:100%;padding:var(--space-3) var(--space-5);cursor:pointer;background:0 0;border:none;min-height:52px;display:flex}.feedback-summary:hover{background:#00000008}.feedback-chevron{color:var(--color-text-muted);flex-shrink:0;transition:transform .2s}.feedback-chevron.open{transform:rotate(180deg)}.feedback-icon{flex-shrink:0;font-size:1.75rem;line-height:1}.feedback-title{color:var(--color-text);font-size:1rem;font-weight:700}.feedback-subtitle{color:var(--color-text-muted);margin-top:2px;font-size:.875rem}.feedback-scores{flex-direction:column;gap:2px;margin-top:4px;display:flex}.score-row{align-items:center;gap:var(--space-2);display:flex}.score-label{color:var(--color-text-muted);flex-shrink:0;width:5.5rem;font-size:.75rem}.stars{gap:1px;display:inline-flex}.star{font-size:1rem;line-height:1}.star.filled{color:#f59e0b}.star.empty{color:var(--color-border-strong)}@keyframes star-pop{0%{opacity:0;transform:scale(0)rotate(-20deg)}60%{opacity:1;transform:scale(1.35)rotate(8deg)}80%{transform:scale(.9)rotate(-3deg)}to{opacity:1;transform:scale(1)rotate(0)}}.feedback-body{color:var(--color-text);white-space:pre-wrap;padding:var(--space-3) var(--space-5) var(--space-4);border-top:1px solid var(--color-border);font-size:.9375rem;line-height:1.7}.feedback-body p{margin-bottom:var(--space-3)}.feedback-body p:last-child{margin-bottom:0}.canvas-hint{justify-content:center;align-items:center;gap:var(--space-3);pointer-events:none;color:var(--color-text-light);-webkit-user-select:none;user-select:none;flex-direction:column;display:flex;position:absolute;inset:0}.canvas-hint-icon{opacity:.5;font-size:2.5rem}.canvas-hint-text{text-align:center;max-width:280px;font-size:.9375rem;line-height:1.5}@media (width<=640px),(hover:none) and (width<=900px){body:has(.app){overflow:auto}.app{height:auto;min-height:100dvh;padding:var(--space-1);gap:var(--space-1);overflow:visible}.top-panel{z-index:20;padding:var(--space-1);gap:var(--space-1);-webkit-backdrop-filter:blur(10px);background:#fffffff5;position:sticky;top:0}.scroll-area{padding:0 var(--space-1) var(--space-3);flex:none;overflow:visible}.app-header{gap:var(--space-2)}.app-title{font-size:1rem}.app-title span{display:none}.practice-header-left{gap:var(--space-2)}.problem-section{padding:var(--space-2) var(--space-3);gap:var(--space-2)}.problem-content{gap:var(--space-1)}.problem-expression{font-size:1.5rem}.problem-expression--word{font-size:1rem}.problem-actions{align-items:stretch;gap:var(--space-1);flex-direction:row;width:100%}.btn-submit,.btn-hint,.btn-new-problem{min-width:0;padding:var(--space-2) var(--space-1);justify-content:center;gap:var(--space-1);flex:1;min-height:44px;font-size:.8125rem}.btn-label-long{display:none}.btn-label-short{display:inline}.canvas-toolbar{gap:var(--space-1);padding:var(--space-2) var(--space-2)}.canvas-section{min-height:75vh}}.page-layout{background:linear-gradient(145deg,#eef2ff 0%,#faf5ff 40%,#eff6ff 100%) fixed;flex-direction:column;min-height:100dvh;display:flex;overflow-y:auto}.page-header{z-index:20;-webkit-backdrop-filter:blur(12px);background:#ffffffd1;border-bottom:1.5px solid #e2e8f099;position:sticky;top:0;box-shadow:0 1px 12px #6366f112}.page-header-inner{max-width:1100px;padding:var(--space-3) var(--space-6);justify-content:space-between;align-items:center;gap:var(--space-4);min-height:60px;margin:0 auto;display:flex}.page-logo{letter-spacing:-.03em;align-items:center;gap:.35em;font-size:1.375rem;font-weight:800;text-decoration:none;display:inline-flex}.page-logo:hover{opacity:.85}.page-logo-emoji{-webkit-text-fill-color:initial;background:0 0;font-style:normal}.page-logo-text{background:var(--gradient-brand);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text}.page-header-right{align-items:center;gap:var(--space-4);display:flex}.page-header-name{color:var(--color-text-muted);font-size:.9375rem;font-weight:500}.page-main{padding:var(--space-8) var(--space-6);flex:1}.dashboard-content{gap:var(--space-6);flex-direction:column;max-width:1100px;margin:0 auto;display:flex}.btn-primary{align-items:center;gap:var(--space-2);padding:var(--space-3) var(--space-5);background:var(--gradient-brand);color:#fff;border-radius:var(--radius-lg);cursor:pointer;white-space:nowrap;border:none;min-height:44px;font-size:.9375rem;font-weight:600;text-decoration:none;transition:opacity .15s,transform .1s,box-shadow .15s;display:inline-flex}.btn-primary:hover:not(:disabled){opacity:.9;transform:translateY(-1px);box-shadow:0 6px 20px #6366f159}.btn-primary:active:not(:disabled){transform:translateY(1px)}.btn-primary:disabled{opacity:.55;cursor:not-allowed}.btn-primary .spinner{border:2px solid #ffffff59;border-top-color:#fff;border-radius:50%;flex-shrink:0;width:16px;height:16px;animation:.7s linear infinite spin}.btn-full{justify-content:center;width:100%}.btn-ghost{padding:var(--space-2) var(--space-3);border-radius:var(--radius-md);color:var(--color-text-muted);cursor:pointer;background:0 0;border:none;min-height:36px;font-size:.9375rem;font-weight:500;transition:background .15s,color .15s}.btn-ghost:hover{color:var(--color-primary);background:#6366f114}.back-btn{align-items:center;gap:var(--space-2);padding:var(--space-1) 0;color:var(--color-text-muted);cursor:pointer;margin-bottom:var(--space-3);background:0 0;border:none;font-size:.875rem;font-weight:500;transition:color .15s;display:inline-flex}.back-btn:hover{color:var(--color-primary)}.link-btn{padding:0 var(--space-2);font-size:inherit;color:var(--color-primary);cursor:pointer;text-underline-offset:2px;background:0 0;border:none;font-weight:500;text-decoration:underline}.link-btn:hover{color:var(--color-primary-hover)}.auth-page{min-height:100dvh;padding:var(--space-6);background:var(--color-bg);justify-content:center;align-items:center;display:flex}.auth-card{background:var(--color-surface);border:1.5px solid var(--color-border);border-radius:var(--radius-xl);width:100%;max-width:440px;padding:var(--space-8);box-shadow:var(--shadow-lg);gap:var(--space-6);flex-direction:column;display:flex}.auth-header{gap:var(--space-1);flex-direction:column;display:flex}.auth-back-link{align-items:center;gap:var(--space-2);color:var(--color-text-muted);margin-bottom:var(--space-3);font-size:.875rem;font-weight:500;text-decoration:none;transition:color .15s;display:inline-flex}.auth-back-link:hover{color:var(--color-primary)}.auth-title{color:var(--color-text);letter-spacing:-.02em;font-size:1.625rem;font-weight:700}.auth-subtitle{color:var(--color-text-muted);font-size:.9375rem}.auth-form{gap:var(--space-4);flex-direction:column;display:flex}.form-field{gap:var(--space-2);flex-direction:column;display:flex}.form-field label{color:var(--color-text);font-size:.875rem;font-weight:600}.form-field input{padding:var(--space-3) var(--space-4);border:1.5px solid var(--color-border);border-radius:var(--radius-md);color:var(--color-text);background:var(--color-surface-alt);min-height:48px;font-size:1rem;font-family:var(--font-sans);outline:none;width:100%;transition:border-color .15s,background .15s}.form-field input:focus{border-color:var(--color-primary);background:var(--color-surface);box-shadow:0 0 0 3px #4f46e51a}.input-large{letter-spacing:.15em;text-align:center;font-size:1.5rem}.input-mono{font-family:var(--font-mono)}.input-hint{color:var(--color-text-muted);font-size:.8125rem}.auth-error{background:var(--color-error-light);border:1px solid var(--color-error-border);border-radius:var(--radius-md);padding:var(--space-3) var(--space-4);color:var(--color-error);font-size:.875rem;font-weight:500}.auth-switch{color:var(--color-text-muted);text-align:center;font-size:.9375rem}.auth-switch a{color:var(--color-primary);font-weight:600;text-decoration:none}.auth-switch a:hover{text-decoration:underline}.step-indicator{justify-content:center;align-items:flex-start;gap:0;display:flex;position:relative}.step-indicator:before{content:"";background:var(--color-border);z-index:0;height:2px;position:absolute;top:16px;left:calc(50% - 80px);right:calc(50% - 80px)}.step-dot{align-items:center;gap:var(--space-2);z-index:1;flex-direction:column;flex:1;max-width:100px;display:flex;position:relative}.step-dot-circle{border:2px solid var(--color-border);background:var(--color-surface);width:32px;height:32px;color:var(--color-text-muted);border-radius:50%;justify-content:center;align-items:center;font-size:.8125rem;font-weight:700;transition:all .2s;display:flex}.step-dot.active .step-dot-circle{border-color:var(--color-primary);background:var(--color-primary);color:#fff}.step-dot.done .step-dot-circle{border-color:var(--color-success);background:var(--color-success);color:#fff}.step-dot-label{color:var(--color-text-muted);text-align:center;font-size:.75rem;font-weight:500}.step-dot.active .step-dot-label{color:var(--color-primary);font-weight:600}.step-dot.done .step-dot-label{color:var(--color-success)}.step-context{color:var(--color-text-muted);align-items:center;gap:var(--space-1);flex-wrap:wrap;font-size:.875rem;display:flex}.step-context strong{color:var(--color-text)}.dashboard-title-row{justify-content:space-between;align-items:flex-start;gap:var(--space-4);flex-wrap:wrap;display:flex}.dashboard-heading{letter-spacing:-.03em;background:var(--gradient-brand);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-size:1.875rem;font-weight:800}.dashboard-subheading{color:var(--color-text-muted);margin-top:var(--space-1);font-size:.9375rem}.dashboard-section-title{color:var(--color-text);margin-bottom:var(--space-4);font-size:1.125rem;font-weight:700}.dashboard-section{flex-direction:column;display:flex}.class-list{gap:var(--space-3);flex-direction:column;list-style:none;display:flex}.class-card{justify-content:space-between;align-items:center;gap:var(--space-4);padding:var(--space-5) var(--space-6);border:1.5px solid var(--color-border);border-radius:var(--radius-xl);cursor:pointer;text-align:left;background:#fff;width:100%;transition:border-color .2s,box-shadow .2s,transform .2s cubic-bezier(.34,1.56,.64,1);display:flex;box-shadow:0 4px 20px #0000000f}.class-card:hover{border-color:var(--color-primary);transform:translateY(-2px);box-shadow:0 12px 40px #6366f124}.class-card-main{gap:var(--space-2);flex-direction:column;display:flex}.class-card-name{color:var(--color-text);font-size:1.125rem;font-weight:600}.class-card-meta{align-items:center;gap:var(--space-3);display:flex}.class-code-badge{padding:var(--space-1) var(--space-3);background:var(--color-primary-light);color:var(--color-primary);border-radius:var(--radius-sm);letter-spacing:.1em;font-size:.875rem;font-weight:700;font-family:var(--font-mono);display:inline-block}.class-code-badge--large{padding:var(--space-2) var(--space-4);letter-spacing:.2em;font-size:1.25rem}.class-student-count{color:var(--color-text-muted);font-size:.875rem}.create-class-card{border:1.5px solid var(--color-primary);border-radius:var(--radius-xl);padding:var(--space-6);background:#fff;animation:.2s ease-out slideIn;box-shadow:0 8px 30px #6366f11f}.create-class-form{gap:var(--space-4);flex-direction:column;display:flex}.create-class-actions{gap:var(--space-3);flex-wrap:wrap;display:flex}.class-detail-code-row{align-items:center;gap:var(--space-3);margin-top:var(--space-3);flex-wrap:wrap;display:flex}.detail-label{color:var(--color-text-muted);font-size:.875rem;font-weight:600}.detail-hint{color:var(--color-text-muted);font-size:.875rem}.student-table-wrapper{border-radius:var(--radius-xl);border:1.5px solid var(--color-border);box-shadow:var(--shadow-sm);overflow-x:auto}.student-table{border-collapse:collapse;background:var(--color-surface);width:100%}.student-table th{padding:var(--space-3) var(--space-5);text-align:left;text-transform:uppercase;letter-spacing:.06em;color:var(--color-text-muted);background:var(--color-surface-alt);border-bottom:1.5px solid var(--color-border);font-size:.8125rem;font-weight:700}.student-table td{padding:var(--space-4) var(--space-5);color:var(--color-text);border-bottom:1px solid var(--color-border);font-size:.9375rem}.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{color:var(--color-text-muted);margin-left:var(--space-2);font-size:.8125rem}.practice-card-grid{gap:var(--space-4);grid-template-columns:repeat(auto-fill,minmax(260px,1fr));display:grid}.practice-card{align-items:flex-start;gap:var(--space-2);padding:var(--space-6);border:1.5px solid var(--color-border);border-radius:var(--radius-xl);cursor:pointer;text-align:left;background:#fff;flex-direction:column;transition:border-color .2s,box-shadow .2s,transform .2s cubic-bezier(.34,1.56,.64,1);display:flex;position:relative;box-shadow:0 4px 20px #0000000f}.practice-card:hover{border-color:var(--color-primary);transform:translateY(-3px);box-shadow:0 12px 40px #6366f124}.practice-card-icon{color:var(--color-primary);font-size:1.5rem;font-weight:800;font-family:var(--font-mono);margin-bottom:var(--space-1)}.practice-card strong{color:var(--color-text);font-size:1.0625rem;font-weight:700}.practice-card span:not(.practice-card-icon):not(.practice-card-arrow){color:var(--color-text-muted);font-size:.875rem;line-height:1.4}.practice-card--student{padding:var(--space-8) var(--space-6);min-height:180px}.practice-card-icon-large{color:var(--color-primary);font-size:2.25rem;font-weight:800;font-family:var(--font-mono);margin-bottom:var(--space-2)}.practice-card-gear{top:var(--space-3);right:var(--space-3);border-radius:var(--radius-md);width:30px;height:30px;color:var(--color-text-light);cursor:pointer;opacity:0;background:0 0;border:none;justify-content:center;align-items:center;transition:opacity .15s,color .15s,background .15s;display:flex;position:absolute}.practice-card:hover .practice-card-gear{opacity:1}@media (hover:none){.practice-card-gear{opacity:1}}.practice-card-gear:hover,.practice-card-gear.active{color:var(--color-primary);background:var(--color-primary-light);opacity:1}.practice-card--settings-open{border-color:var(--color-primary);box-shadow:var(--shadow-md)}.practice-card-settings{width:100%;padding-top:var(--space-4);margin-top:var(--space-2);border-top:1px solid var(--color-border);animation:.15s fadeSlideIn}@keyframes fadeSlideIn{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.practice-card-settings-label{color:var(--color-text-muted);margin:0 0 var(--space-3) 0;font-size:.8125rem}.student-welcome{padding:var(--space-6) var(--space-6) var(--space-5);border-radius:var(--radius-xl);background:#fff;border:1.5px solid #e2e8f0b3;box-shadow:0 4px 20px #0000000d}.student-welcome-title{letter-spacing:-.03em;background:var(--gradient-brand);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-size:2rem;font-weight:800}.student-welcome-sub{color:var(--color-text-muted);margin-top:var(--space-1);font-size:1rem}.student-stats-section{flex-direction:column;display:flex}.stats-card{border:1.5px solid var(--color-border);border-radius:var(--radius-xl);padding:var(--space-5) var(--space-6);align-items:center;gap:var(--space-6);background:#fff;border-left:3px solid #7c3aed;flex-wrap:wrap;display:flex;box-shadow:0 4px 20px #0000000f}.stat-item{align-items:center;gap:var(--space-1);flex-direction:column;flex:1;min-width:80px;display:flex}.stat-value{color:var(--color-primary);font-size:1.75rem;font-weight:700}.stat-label{color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.06em;text-align:center;font-size:.75rem;font-weight:600}.stat-divider{background:var(--color-border);flex-shrink:0;width:1px;height:48px}.landing{min-height:100dvh;padding:var(--space-8) var(--space-6);background:linear-gradient(145deg,#eef2ff 0%,#faf5ff 40%,#eff6ff 100%);justify-content:center;align-items:center;display:flex;position:relative;overflow:hidden}.landing:before,.landing:after{content:"";filter:blur(80px);opacity:.35;pointer-events:none;border-radius:50%;position:absolute}.landing:before{background:radial-gradient(circle,#818cf8,#c084fc);width:500px;height:500px;top:-120px;left:-100px}.landing:after{background:radial-gradient(circle,#38bdf8,#818cf8);width:400px;height:400px;bottom:-80px;right:-80px}.landing-inner{align-items:center;gap:var(--space-10);z-index:1;flex-direction:column;width:100%;max-width:680px;display:flex;position:relative}.landing-hero{text-align:center;align-items:center;gap:var(--space-4);flex-direction:column;display:flex}.landing-logo{background:#fff;border-radius:36px;justify-content:center;align-items:center;width:140px;height:140px;animation:3s ease-in-out infinite logo-float;display:flex;box-shadow:0 8px 32px #6366f133,0 2px 8px #00000014}@keyframes logo-float{0%,to{transform:translateY(0)}50%{transform:translateY(-6px)}}.landing-logo-icon{display:block}.landing-title{letter-spacing:-.04em;background:linear-gradient(135deg,#4f46e5 0%,#7c3aed 50%,#0ea5e9 100%);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-size:clamp(2.5rem,8vw,4rem);font-weight:900;line-height:1}.landing-tagline{color:var(--color-text-muted);max-width:460px;font-size:1.125rem;line-height:1.6}.landing-tagline strong{color:var(--color-text)}.landing-cta-grid{gap:var(--space-4);grid-template-columns:1fr 1fr;width:100%;display:grid}.landing-cta-card{align-items:center;gap:var(--space-3);padding:var(--space-8) var(--space-6);cursor:pointer;text-align:center;background:#fff;border:2px solid #0000;border-radius:20px;flex-direction:column;transition:all .2s cubic-bezier(.34,1.56,.64,1);display:flex;box-shadow:0 4px 20px #00000012}.landing-cta-card:hover{transform:translateY(-4px)scale(1.02);box-shadow:0 12px 40px #6366f12e}.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{color:var(--color-text);font-size:1.125rem;font-weight:700}.landing-cta-card span{color:var(--color-text-muted);font-size:.875rem;line-height:1.4}.landing-features{gap:var(--space-3);grid-template-columns:1fr 1fr;width:100%;list-style:none;display:grid}.landing-feature{align-items:flex-start;gap:var(--space-3);color:var(--color-text-muted);border-radius:var(--radius-lg);padding:var(--space-3) var(--space-4);background:#fff;font-size:.9rem;display:flex;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{color:var(--color-text-light);letter-spacing:.05em;font-size:.8rem}.empty-state{align-items:center;gap:var(--space-4);padding:var(--space-12) var(--space-6);text-align:center;color:var(--color-text-muted);flex-direction:column;display:flex}.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{align-items:center;gap:var(--space-4);display:flex}@media (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{gap:var(--space-4);flex-direction:column}.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{align-items:flex-start;gap:var(--space-1);flex-direction:column}}.toggle-row{justify-content:space-between;align-items:center;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;display:flex}.toggle-row--inline{border:none;margin:0;padding:0}.toggle-label{color:var(--color-text);cursor:default;flex-direction:column;gap:2px;font-size:.9375rem;font-weight:500;display:flex}.toggle-hint{color:var(--color-text-muted);font-size:.8125rem;font-weight:400}.toggle-switch{cursor:pointer;border:none;border-radius:9999px;flex-shrink:0;width:44px;height:26px;padding:0;transition:background .2s;position:relative}.toggle-switch.on{background:var(--color-primary)}.toggle-switch.off{background:var(--color-border-strong)}.toggle-knob{background:#fff;border-radius:50%;width:20px;height:20px;transition:left .2s;position:absolute;top:3px;box-shadow:0 1px 3px #0003}.toggle-switch.on .toggle-knob{left:21px}.toggle-switch.off .toggle-knob{left:3px}.enrollment-badge{padding:2px var(--space-2);border-radius:9999px;font-size:.75rem;font-weight:600;display:inline-block}.enrollment-badge--closed{background:var(--color-error-light);color:var(--color-error)}.class-detail-actions{align-items:center;gap:var(--space-4);flex-wrap:wrap;display:flex}.btn-pin-reset{border:1px solid var(--color-border-strong);border-radius:var(--radius-sm);padding:var(--space-1) var(--space-3);color:var(--color-text-muted);cursor:pointer;white-space:nowrap;background:0 0;font-size:.8125rem;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{align-items:center;gap:var(--space-3);flex-wrap:wrap;display:flex}.pin-reset-label{color:var(--color-text-muted);font-size:.875rem}.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);min-height:36px;font-size:.875rem}.modal-backdrop{z-index:200;padding:var(--space-4);background:#00000073;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.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{margin-bottom:var(--space-5);color:var(--color-text);font-size:1.25rem;font-weight:700}.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);margin-bottom:var(--space-3);font-size:.9375rem}.auth-link-btn{color:var(--color-primary);cursor:pointer;background:0 0;border:none;padding:0;font-size:.9375rem;text-decoration:underline}.auth-link-btn:hover{color:var(--color-primary-hover)}.btn-copy-link{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);color:var(--color-text-muted);cursor:pointer;white-space:nowrap;font-size:.875rem;font-weight:500;transition:all .15s;display:inline-flex}.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{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 var(--color-error-border);border-radius:var(--radius-lg);cursor:pointer;white-space:nowrap;font-size:.9375rem;font-weight:600;transition:all .15s;display:inline-flex}.btn-danger:hover:not(:disabled){background:var(--color-error);color:#fff;border-color:var(--color-error)}.btn-danger:disabled{opacity:.55;cursor:not-allowed}.btn-pin-reset--danger{color:var(--color-error);border-color:var(--color-error-border)}.btn-pin-reset--danger:hover{background:var(--color-error-light);border-color:var(--color-error);color:var(--color-error)}.delete-student-confirm{color:var(--color-text-muted);white-space:nowrap;align-items:center;font-size:.8125rem;display:inline-flex}.recent-classes{margin-bottom:var(--space-6)}.recent-classes-label{text-transform:uppercase;letter-spacing:.06em;color:var(--color-text-muted);margin:0 0 var(--space-2) 0;font-size:.75rem;font-weight:600}.recent-class-card{width:100%;padding:var(--space-3) 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;justify-content:space-between;align-items:center;transition:border-color .15s,background .15s;display:flex}.recent-class-card:hover{border-color:var(--color-primary);background:var(--color-primary-light,#eff6ff)}.recent-class-info{flex-direction:column;gap:2px;display:flex}.recent-class-name{color:var(--color-text);font-size:.9375rem;font-weight:600}.recent-class-meta{color:var(--color-text-muted);font-size:.8125rem}.form-group{gap:var(--space-2);margin-bottom:var(--space-3);flex-direction:column;display:flex}.form-label{color:var(--color-text);font-size:.8125rem;font-weight:600}.form-input{padding:var(--space-2) var(--space-3);border:1.5px solid var(--color-border);border-radius:var(--radius-md);color:var(--color-text);background:var(--color-surface);min-height:40px;font-size:.9375rem;font-family:var(--font-sans);outline:none;transition:border-color .15s,box-shadow .15s}.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{align-items:center;gap:var(--space-2);text-transform:uppercase;letter-spacing:.1em;color:var(--color-primary);background:var(--color-primary-light);border-radius:var(--radius-sm);padding:2px var(--space-2);border:1px solid #4f46e533;font-size:.75rem;font-weight:700;display:inline-flex}.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{border-radius:var(--radius-lg);border:1.5px solid var(--color-border);overflow-x:auto}.admin-table{border-collapse:collapse;background:var(--color-surface);width:100%;font-size:.9375rem}.admin-table th{text-align:left;padding:var(--space-3) var(--space-4);background:var(--color-surface-alt);color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.06em;border-bottom:1.5px solid var(--color-border);white-space:nowrap;font-size:.75rem;font-weight:700}.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{border-bottom:1.5px solid var(--color-border);flex-wrap:wrap;gap:0;padding-bottom:0;display:flex}.admin-tab{align-items:center;gap:var(--space-2);padding:var(--space-3) var(--space-4);color:var(--color-text-muted);cursor:pointer;border-radius:var(--radius-sm) var(--radius-sm) 0 0;background:0 0;border:1.5px solid #0000;border-bottom:none;margin-bottom:-1.5px;font-size:.875rem;font-weight:500;transition:color .15s,background .15s,border-color .15s;display:inline-flex}.admin-tab:hover{color:var(--color-text);background:var(--color-surface-alt)}.admin-tab.active{color:var(--color-primary);background:var(--color-surface);border-color:var(--color-border);border-bottom-color:var(--color-surface);font-weight:600}.admin-tab-count{min-width:20px;padding:0 var(--space-2);background:var(--color-border);height:18px;color:var(--color-text-muted);border-radius:9999px;justify-content:center;align-items:center;font-size:.7rem;font-weight:700;display:inline-flex}.admin-tab.active .admin-tab-count{background:var(--color-primary-light);color:var(--color-primary)}.admin-loading{align-items:center;gap:var(--space-3);padding:var(--space-10) 0;color:var(--color-text-muted);font-size:.9375rem;display:flex}.admin-loading:before{content:"";border:2px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;flex-shrink:0;width:18px;height:18px;animation:.7s linear infinite spin;display:block}.admin-code{font-family:var(--font-mono);background:var(--color-primary-light);border-radius:var(--radius-sm);padding:1px var(--space-2);color:var(--color-primary);letter-spacing:.04em;border:1px solid #4f46e526;font-size:.8125rem}.admin-badge{padding:2px var(--space-2);white-space:nowrap;border-radius:9999px;font-size:.75rem;font-weight:600;display:inline-block}.admin-badge--open{background:var(--color-success-light);color:var(--color-success);border:1px solid var(--color-success-border)}.admin-badge--closed{background:var(--color-surface-alt);color:var(--color-text-muted);border:1px solid var(--color-border)}.admin-section-heading{color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.07em;margin-bottom:var(--space-3);padding-bottom:var(--space-2);border-bottom:1px solid var(--color-border);font-size:.75rem;font-weight:700}.admin-stat-card{background:var(--color-surface-alt);border:1.5px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-4) var(--space-5)}.admin-stat-card__label{text-transform:uppercase;letter-spacing:.07em;color:var(--color-text-muted);margin-bottom:var(--space-1);font-size:.7rem;font-weight:700}.admin-stat-card__value{color:var(--color-text);letter-spacing:-.02em;font-size:1.625rem;font-weight:700;line-height:1.1}.admin-stat-card__sub{color:var(--color-text-muted);margin-top:var(--space-1);font-size:.75rem}.admin-mini-stat{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:var(--space-3) var(--space-3)}.admin-mini-stat--highlight{border-color:var(--color-success-border);background:var(--color-success-light)}.admin-mini-stat--alert{border-color:var(--color-error-border);background:var(--color-error-light)}.admin-mini-stat__label{text-transform:uppercase;letter-spacing:.06em;color:var(--color-text-muted);margin-bottom:2px;font-size:.65rem;font-weight:700}.admin-mini-stat__value{color:var(--color-text);font-size:1.1rem;font-weight:700}.admin-mini-stat--highlight .admin-mini-stat__value{color:var(--color-success)}.admin-mini-stat--alert .admin-mini-stat__value{color:var(--color-error)}.admin-mini-stat__sub{color:var(--color-text-muted);margin-top:1px;font-size:.65rem}.admin-input-badge{padding:1px var(--space-2);white-space:nowrap;border-radius:9999px;font-size:.72rem;font-weight:600;display:inline-block}.admin-input-badge--canvas{color:#166534;background:#f0fdf4;border:1px solid #bbf7d0}.admin-input-badge--photo{color:#92400e;background:#fef3c7;border:1px solid #fcd34d}.admin-config-panel{background:var(--color-surface);border:1.5px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-5) var(--space-6)}.admin-config-panel__title{color:var(--color-text);margin-bottom:var(--space-4);padding-bottom:var(--space-3);border-bottom:1px solid var(--color-border);font-size:.875rem;font-weight:700}.admin-history-row{border:1.5px solid var(--color-border);border-radius:var(--radius-lg);transition:border-color .15s;overflow:hidden}.admin-history-row:hover{border-color:var(--color-border-strong)}.admin-history-row__btn{background:var(--color-surface);cursor:pointer;width:100%;padding:var(--space-3) var(--space-4);text-align:left;align-items:center;gap:var(--space-3);border:none;flex-wrap:wrap;transition:background .15s;display:flex}.admin-history-row__btn:hover{background:var(--color-surface-alt)}.admin-sub-section-title{color:var(--color-text);margin-bottom:var(--space-3);font-size:.875rem;font-weight:700}.admin-settings-section{background:var(--color-surface);border:1.5px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-6)}.admin-settings-section h2{color:var(--color-text);margin-bottom:var(--space-5);padding-bottom:var(--space-3);border-bottom:1px solid var(--color-border);font-size:.9375rem;font-weight:700}.admin-empty-state{align-items:center;gap:var(--space-3);padding:var(--space-12) var(--space-6);text-align:center;flex-direction:column;display:flex}.admin-empty-state__icon{opacity:.3;font-size:2rem}.admin-empty-state__message{color:var(--color-text-muted);max-width:36ch;font-size:.9375rem;line-height:1.5}.btn-secondary{align-items:center;gap:var(--space-2);padding:var(--space-2) var(--space-4);background:var(--color-surface);color:var(--color-text-muted);border:1.5px solid var(--color-border-strong);border-radius:var(--radius-md);cursor:pointer;white-space:nowrap;min-height:36px;font-size:.875rem;font-weight:500;transition:border-color .15s,color .15s,background .15s;display:inline-flex}.btn-secondary:hover:not(:disabled){border-color:var(--color-primary);color:var(--color-primary);background:var(--color-primary-light)}.btn-secondary:disabled{opacity:.55;cursor:not-allowed}.admin-log-list{font-family:var(--font-mono);border:1.5px solid var(--color-border);border-radius:var(--radius-lg);color:#cdd6f4;background:#1e1e2e;max-height:640px;font-size:.8125rem;line-height:1.6;overflow-y:auto}.admin-log-line{padding:var(--space-2) var(--space-4);word-break:break-all;border-bottom:1px solid #ffffff0d}.admin-log-line:last-child{border-bottom:none}.admin-log-line:hover{background:#ffffff0a}.admin-log-line--error{color:#f38ba8}.admin-log-line--warn{color:#fab387}.admin-log-line--success{color:#a6e3a1}.admin-panel-toolbar{margin-bottom:var(--space-5);justify-content:space-between;align-items:center;gap:var(--space-3);display:flex}.admin-panel-toolbar__title{color:var(--color-text-muted);font-size:.875rem;font-weight:600}.settings-modal{max-width:420px}.settings-section{padding:var(--space-5) 0;border-bottom:1px solid var(--color-border)}.settings-section:last-child{border-bottom:none;padding-bottom:0}.settings-section-title{color:var(--color-text);margin:0 0 var(--space-1) 0;font-size:.9375rem;font-weight:600}.settings-section-desc{color:var(--color-text-muted);margin:0 0 var(--space-3) 0;font-size:.8125rem}.settings-section-hint{color:var(--color-text-muted);margin:var(--space-2) 0 0 0;font-size:.75rem}.term-selector{gap:var(--space-2);display:flex}.term-option{min-width:44px;height:44px;padding:0 var(--space-3);background:var(--color-surface);border:1.5px solid var(--color-border);border-radius:var(--radius-lg);color:var(--color-text-muted);cursor:pointer;font-size:1rem;font-weight:600;transition:all .15s}.term-option:hover{border-color:var(--color-primary);color:var(--color-primary)}.term-option.active{background:var(--color-primary);border-color:var(--color-primary);color:#fff}.expand-paper-row{justify-content:center;padding:.75rem 0 .5rem;display:flex}.expand-paper-btn{border:2px solid var(--color-border);background:var(--color-surface);width:2.25rem;height:2.25rem;color:var(--color-text-muted);cursor:pointer;border-radius:50%;justify-content:center;align-items:center;font-size:1.375rem;line-height:1;transition:border-color .15s,color .15s,transform .1s;display:flex}.expand-paper-btn:hover{border-color:var(--color-primary);color:var(--color-primary);transform:scale(1.1)}.expand-paper-btn:active{transform:scale(.95)}.canvas-wrapper.text-mode{cursor:text}.canvas-text-input{z-index:200;caret-color:currentColor;background:0 0;border:none;border-bottom:1.5px dashed #94a3b8;outline:none;min-width:80px;max-width:90vw;padding:0 2px;font-family:Caveat,cursive;font-weight:400;line-height:1;transform:translateY(-80%)}.calculator{z-index:100;background:var(--color-surface);border:1.5px solid var(--color-border);border-radius:var(--radius-xl);width:240px;box-shadow:var(--shadow-lg,0 8px 24px #0000002e);-webkit-user-select:none;user-select:none;touch-action:none;position:fixed;top:3rem;right:1rem}.calc-header{border-bottom:1px solid var(--color-border);cursor:grab;justify-content:space-between;align-items:center;padding:.5rem .75rem;display:flex}.calc-header:active{cursor:grabbing}.calc-title{color:var(--color-text-muted);letter-spacing:.04em;font-size:.8125rem;font-weight:600}.calc-close{cursor:pointer;color:var(--color-text-muted);border-radius:var(--radius-sm);background:0 0;border:none;padding:.125rem .25rem;font-size:.875rem;line-height:1}.calc-close:hover{background:var(--color-border);color:var(--color-text)}.calc-display{text-align:right;background:var(--color-surface-alt,#f8f9fa);border-bottom:1px solid var(--color-border);padding:.5rem .75rem .375rem}.calc-expression{color:var(--color-text-muted);text-overflow:ellipsis;white-space:nowrap;min-height:1rem;font-size:.6875rem;overflow:hidden}.calc-value{font-variant-numeric:tabular-nums;color:var(--color-text);text-overflow:ellipsis;white-space:nowrap;font-size:1.375rem;font-weight:600;overflow:hidden}.calc-grid{grid-template-columns:repeat(4,1fr);align-items:center;gap:.3125rem;padding:.5rem;display:grid}.calc-btn{border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-surface);color:var(--color-text);cursor:pointer;padding:.4375rem 0;font-size:.9375rem;font-weight:500;line-height:1;transition:background .1s,transform 70ms}.calc-btn:active{transform:scale(.93)}.calc-btn:hover{background:var(--color-border)}.calc-btn--secondary{background:var(--color-surface-alt,#f0f0f0);color:var(--color-text-muted);font-size:.8125rem}.calc-btn--secondary:hover{background:var(--color-border);color:var(--color-text)}.calc-btn--operator{background:var(--color-primary-light,#e8f0fe);border-color:var(--color-primary,#4f8ef7);color:var(--color-primary,#4f8ef7);font-weight:600}.calc-btn--operator:hover{background:var(--color-primary,#4f8ef7);color:#fff}.calc-btn--equals{background:var(--color-primary,#4f8ef7);border-color:var(--color-primary,#4f8ef7);color:#fff;font-weight:700}.calc-btn--equals:hover{filter:brightness(1.1)}.calc-btn--wide{grid-column:span 2}.calc-k-hint{color:var(--color-text-muted);text-align:center;grid-column:span 2;padding:.125rem 0;font-size:.625rem}.calc-mode-toggle{letter-spacing:.04em;border:1.5px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface-alt);color:var(--color-text-muted);cursor:pointer;padding:.1875rem .5rem;font-size:.6875rem;font-weight:700;transition:background .15s,color .15s,border-color .15s}.calc-mode-toggle:hover{background:var(--color-border);color:var(--color-text)}.calc-mode-toggle--active{background:var(--color-primary,#4f8ef7);border-color:var(--color-primary,#4f8ef7);color:#fff}.calc-sci-panel{border-bottom:1px solid var(--color-border);background:var(--color-surface-alt);flex-direction:column;gap:.25rem;padding:.375rem .5rem .25rem;display:flex}.calc-sci-toggles,.calc-sci-row{grid-template-columns:repeat(4,1fr);gap:.25rem;display:grid}.calc-btn--sci{border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface);color:#6d28d9;cursor:pointer;padding:.3125rem 0;font-size:.75rem;font-weight:600;line-height:1;transition:background .1s,transform 70ms}.calc-btn--sci:hover{background:#ede9fe}.calc-btn--sci:active{transform:scale(.93)}.calc-btn--active{color:#fff!important;background:#7c3aed!important;border-color:#7c3aed!important}.dashboard-section-header{margin-bottom:var(--space-4);justify-content:space-between;align-items:center;display:flex}.dashboard-section-header .dashboard-section-title{margin-bottom:0}.btn-catalog-link{color:var(--color-primary);padding:var(--space-1) var(--space-3);border:1.5px solid var(--color-primary);border-radius:6px;font-size:.875rem;font-weight:600;text-decoration:none;transition:background .15s,color .15s}.btn-catalog-link:hover{background:var(--color-primary-light)}.focused-empty{text-align:center;padding:var(--space-12) var(--space-8);color:var(--color-text-muted);align-items:center;gap:var(--space-4);flex-direction:column;display:flex}.dashboard-section-actions{align-items:center;gap:var(--space-3);display:flex}.btn-add-own{color:var(--color-text-muted);border:1.5px solid var(--color-border-strong);padding:var(--space-1) var(--space-3);cursor:pointer;background:0 0;border-radius:6px;font-size:.875rem;font-weight:600;line-height:1.6;transition:color .15s,border-color .15s,background .15s}.btn-add-own:hover{color:var(--color-primary);border-color:var(--color-primary);background:var(--color-primary-light)}.practice-card-own-badge{top:var(--space-3);left:var(--space-3);opacity:.7;font-size:.85rem;line-height:1;position:absolute}.add-own-modal{max-width:520px}.add-own-intro{color:var(--color-text-muted);margin-bottom:var(--space-5);font-size:.9375rem;line-height:1.5}.add-own-upload-area{align-items:center;gap:var(--space-2);width:100%;padding:var(--space-8) var(--space-4);border:2px dashed var(--color-border-strong);border-radius:var(--radius-lg);background:var(--color-surface-alt);cursor:pointer;margin-bottom:var(--space-3);text-align:center;color:var(--color-text);flex-direction:column;transition:border-color .15s,background .15s;display:flex}.add-own-upload-area:hover{border-color:var(--color-primary);background:var(--color-primary-light)}.add-own-upload-icon{font-size:2rem;line-height:1}.add-own-upload-label{font-size:.9375rem;font-weight:600}.add-own-upload-hint{color:var(--color-text-muted);font-size:.8125rem}.add-own-camera-btn{width:100%;margin-bottom:var(--space-4);justify-content:center}.add-own-preview-img{object-fit:contain;border-radius:var(--radius-md);border:1.5px solid var(--color-border);width:100%;max-height:280px;margin-bottom:var(--space-4);background:#000;display:block}.add-own-preview-img--dim{opacity:.35}.add-own-analyzing-wrap{margin-bottom:var(--space-4);position:relative}.add-own-analyzing-overlay{justify-content:center;align-items:center;gap:var(--space-3);color:var(--color-text);flex-direction:column;font-weight:600;display:flex;position:absolute;inset:0}.add-own-spinner{border:3px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;width:2rem;height:2rem;animation:.7s linear infinite spin;display:inline-block}.add-own-actions{gap:var(--space-2);margin-bottom:var(--space-2);flex-direction:column;display:flex}.add-own-actions .btn-primary,.add-own-actions .btn-secondary{justify-content:center;width:100%}.add-own-result-row{align-items:center;gap:var(--space-4);margin-bottom:var(--space-4);display:flex}.add-own-result-thumb{flex:0 0 80px}.add-own-result-thumb img{object-fit:cover;border-radius:var(--radius-sm);border:1.5px solid var(--color-border);width:80px;height:64px}.add-own-result-arrow{color:var(--color-text-muted);flex-shrink:0;font-size:1.25rem}.add-own-result-card{align-items:flex-start;gap:var(--space-1);background:var(--color-surface-alt);border:1.5px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-3) var(--space-4);flex-direction:column;flex:1;display:flex}.add-own-result-icon{font-size:1.5rem;font-family:var(--font-mono);line-height:1}.add-own-result-title{color:var(--color-text);font-size:.9375rem}.add-own-result-grade{color:var(--color-text-muted);background:var(--color-border);border-radius:4px;padding:1px 6px;font-size:.75rem}.add-own-result-desc{color:var(--color-text-muted);margin-bottom:var(--space-4);font-size:.875rem;line-height:1.5}.add-own-confidence-warn{color:var(--color-warning);background:var(--color-warning-light);border:1px solid var(--color-warning-border);border-radius:var(--radius-sm);padding:var(--space-2) var(--space-3);margin-bottom:var(--space-4);font-size:.875rem}.add-own-error{color:var(--color-error);background:var(--color-error-light);border:1px solid var(--color-error-border);border-radius:var(--radius-sm);padding:var(--space-3) var(--space-4);margin-bottom:var(--space-4);font-size:.9rem}.catalog-content{max-width:960px;padding:var(--space-8) var(--space-6) 6rem;margin:0 auto}.catalog-header{margin-bottom:var(--space-6)}.catalog-title{margin-bottom:var(--space-1);font-size:1.625rem;font-weight:800}.catalog-subtitle{color:var(--color-text-muted);font-size:.9375rem}.catalog-search{width:100%;padding:var(--space-3) var(--space-4);border:1.5px solid var(--color-border);background:var(--color-surface);color:var(--color-text);margin-bottom:var(--space-4);box-sizing:border-box;border-radius:8px;outline:none;font-size:.9375rem;transition:border-color .15s}.catalog-search:focus{border-color:var(--color-primary)}.catalog-controls{margin-bottom:var(--space-4)}.catalog-filters{gap:var(--space-2);flex-direction:column;display:flex}.filter-group{gap:var(--space-2);flex-wrap:wrap;display:flex}.filter-chip{padding:var(--space-1) var(--space-3);border:1.5px solid var(--color-border);background:var(--color-surface);color:var(--color-text-muted);cursor:pointer;border-radius:999px;font-size:.8125rem;font-weight:500;transition:border-color .15s,background .15s,color .15s}.filter-chip:hover{border-color:var(--color-primary);color:var(--color-primary)}.filter-chip.active{background:var(--color-primary);border-color:var(--color-primary);color:#fff}.catalog-bulk{margin-bottom:var(--space-4);justify-content:space-between;align-items:center;display:flex}.catalog-count{color:var(--color-text-muted);font-size:.875rem}.catalog-bulk-actions{gap:var(--space-2);display:flex}.btn-sm{padding:var(--space-1) var(--space-3);font-size:.8125rem}.catalog-empty{text-align:center;color:var(--color-text-muted);padding:var(--space-12) 0}.catalog-grid{gap:var(--space-4);grid-template-columns:repeat(auto-fill,minmax(260px,1fr));display:grid}.catalog-card{gap:var(--space-2);padding:var(--space-4) var(--space-4) var(--space-3);border:1.5px solid var(--color-border);background:var(--color-surface);text-align:left;cursor:pointer;border-radius:12px;flex-direction:column;transition:border-color .15s,box-shadow .15s,background .15s;display:flex;position:relative}.catalog-card:hover{border-color:var(--color-primary);box-shadow:var(--shadow-md)}.catalog-card--selected{border-color:var(--color-primary);background:var(--color-primary-light)}.catalog-card-check{top:var(--space-3);right:var(--space-3);border:2px solid var(--color-border);width:1.25rem;height:1.25rem;color:var(--color-primary);background:var(--color-surface);border-radius:4px;justify-content:center;align-items:center;font-size:.75rem;font-weight:800;transition:border-color .15s,background .15s;display:flex;position:absolute}.catalog-card--selected .catalog-card-check{border-color:var(--color-primary);background:var(--color-primary);color:#fff}.catalog-card-icon{font-size:1.75rem;font-weight:800;line-height:1}.catalog-card-body{gap:var(--space-1);flex-direction:column;flex:1;display:flex}.catalog-card-title{color:var(--color-text);font-size:.9375rem;font-weight:700}.catalog-card-desc{color:var(--color-text-muted);font-size:.8125rem;line-height:1.4}.catalog-card-meta{gap:var(--space-2);margin-top:var(--space-1);flex-wrap:wrap;display:flex}.catalog-badge{letter-spacing:.02em;border-radius:999px;padding:.125rem .5rem;font-size:.6875rem;font-weight:600}.catalog-badge--grade{color:#3730a3;background:#e0e7ff}.catalog-badge--cat{color:#166534;background:#f0fdf4}.catalog-save-bar{padding:var(--space-4) var(--space-6);background:var(--color-surface);border-top:1.5px solid var(--color-border);z-index:100;justify-content:space-between;align-items:center;display:flex;position:fixed;bottom:0;left:0;right:0;box-shadow:0 -4px 12px #00000014}.catalog-save-count{color:var(--color-text-muted);font-size:.9375rem;font-weight:600}.btn-saved{background:#16a34a!important;border-color:#16a34a!important}@media (width<=480px){.catalog-content{padding:var(--space-6) var(--space-4) 6rem}.catalog-save-bar{padding:var(--space-3) var(--space-4)}.catalog-grid{grid-template-columns:1fr}.filter-group{gap:var(--space-1)}.filter-chip{padding:.2rem .625rem;font-size:.75rem}}.assigned-topics-section{margin-top:var(--space-8)}.assigned-topics-empty{align-items:flex-start;gap:var(--space-3);padding:var(--space-6) 0;color:var(--color-text-muted);flex-direction:column;display:flex}.assigned-topics-grid{gap:var(--space-3);margin-bottom:var(--space-3);grid-template-columns:repeat(auto-fill,minmax(180px,1fr));display:grid}.assigned-topic-card{align-items:flex-start;gap:var(--space-1);padding:var(--space-3) var(--space-4);border:1.5px solid var(--color-border);background:var(--color-surface);cursor:pointer;text-align:left;border-radius:10px;flex-direction:column;transition:border-color .15s,box-shadow .15s;display:flex}.assigned-topic-card:hover{border-color:var(--color-primary);box-shadow:var(--shadow-sm)}.assigned-topic-icon{font-size:1.375rem;font-weight:800;line-height:1}.assigned-topic-title{color:var(--color-text);font-size:.875rem;font-weight:600;line-height:1.3}.assigned-topic-badges{margin-top:var(--space-1)}.section-see-all{margin-top:var(--space-2);justify-content:flex-end;display:flex}