:root{--surface: #f9f9fb;--surface-dim: #d9dadc;--surface-bright: #f9f9fb;--surface-container-lowest: #ffffff;--surface-container-low: #f3f3f5;--surface-container: #eeeef0;--surface-container-high: #e8e8ea;--surface-container-highest: #e2e2e4;--on-surface: #1a1c1d;--on-surface-variant: #444748;--inverse-surface: #2f3132;--inverse-on-surface: #f0f0f2;--outline: #747878;--outline-variant: #c4c7c7;--primary: #1e1e1e;--on-primary: #ffffff;--primary-container: #333333;--on-primary-container: #9c9b9b;--primary-fixed: #e4e2e1;--primary-fixed-dim: #c8c6c6;--secondary: #5e5e63;--on-secondary: #ffffff;--secondary-container: #e0dfe4;--on-secondary-container: #626267;--tertiary: #00212c;--on-tertiary: #ffffff;--tertiary-container: #103745;--on-tertiary-container: #7da0b0;--tertiary-fixed: #c3e8fa;--tertiary-fixed-dim: #a8ccdd;--on-tertiary-fixed-variant: #284b59;--accent: #4a6d7c;--on-accent: #ffffff;--success: #3b6d11;--success-bg: #eaf3de;--warning: #854f0b;--warning-bg: #faeeda;--error: #ba1a1a;--on-error: #ffffff;--error-container: #ffdad6;--on-error-container: #93000a;--radius-sm: .25rem;--radius: .5rem;--radius-md: .75rem;--radius-lg: 1rem;--radius-xl: 1.5rem;--radius-full: 9999px;--sp-xs: 4px;--sp-base: 8px;--sp-sm: 12px;--sp-md: 24px;--sp-lg: 48px;--sp-xl: 80px;--gutter: 24px;--max-width: 1200px;--font-display: "Plus Jakarta Sans", sans-serif;--font-body: "Plus Jakarta Sans", sans-serif;--shadow-sm: 0 1px 3px rgba(26, 28, 29, .06);--shadow-md: 0 4px 20px rgba(0, 0, 0, .04);--shadow-lg: 0 30px 60px rgba(74, 109, 124, .06)}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--surface);font-family:var(--font-body);color:var(--on-surface);direction:rtl;-webkit-font-smoothing:antialiased}h1,h2,h3,h4{font-family:var(--font-display);margin:0 0 8px;font-weight:600;letter-spacing:-.01em}p{line-height:1.6}button,input{font-family:var(--font-body)}button{cursor:pointer}a{color:inherit;text-decoration:none}.material-symbols-outlined{font-variation-settings:"FILL" 0,"wght" 400,"GRAD" 0,"opsz" 24;font-size:22px;line-height:1;-webkit-user-select:none;user-select:none}.shell{min-height:100%;display:flex;flex-direction:column}.topbar{position:sticky;top:0;z-index:30;height:64px;background:var(--surface);border-bottom:1px solid var(--outline-variant);display:flex;flex-direction:row-reverse;align-items:center;justify-content:space-between;padding:0 var(--gutter)}.topbar-brand{font-family:var(--font-display);font-weight:700;font-size:20px;color:var(--primary)}.topbar-actions{display:flex;align-items:center;gap:4px}.icon-btn{background:transparent;border:none;border-radius:var(--radius-full);width:40px;height:40px;display:flex;align-items:center;justify-content:center;color:var(--on-surface-variant);transition:background .15s ease}.icon-btn:hover{background:var(--surface-container-low)}.body-row{flex:1;display:flex;flex-direction:row-reverse}.sidenav{width:240px;flex-shrink:0;background:var(--surface-container-low);border-left:1px solid var(--outline-variant);padding:var(--sp-md) var(--sp-sm);display:none;flex-direction:column}@media (min-width: 900px){.sidenav{display:flex}}.sidenav-profile{display:flex;flex-direction:row-reverse;align-items:center;gap:12px;padding:8px;margin-bottom:24px}.sidenav-avatar{width:44px;height:44px;border-radius:50%;background:var(--secondary-container);display:flex;align-items:center;justify-content:center;font-size:22px;flex-shrink:0}.sidenav-nav{display:flex;flex-direction:column;gap:4px;flex:1}.nav-item{cursor:pointer;display:flex;flex-direction:row-reverse;align-items:center;gap:12px;padding:12px;border-radius:var(--radius-md);color:var(--on-surface-variant);font-weight:500;font-size:14px;transition:background .15s ease}.nav-item:hover{background:var(--surface-container-high)}.nav-item.active{background:var(--secondary-container);color:var(--on-secondary-container);font-weight:700}.sidenav-logout{display:flex;flex-direction:row-reverse;align-items:center;justify-content:center;gap:8px;padding:12px;border-radius:var(--radius-md);border:1px solid var(--error);color:var(--error);background:transparent;font-weight:500;font-size:14px;margin-top:auto}.sidenav-logout:hover{background:var(--error-container)}.main-content{flex:1;min-width:0;padding:var(--sp-lg) var(--gutter) 100px;max-width:var(--max-width);margin:0 auto;width:100%}@media (max-width: 640px){.main-content{padding:var(--sp-md) 16px 90px}}.bottomnav{position:fixed;bottom:0;left:0;width:100%;z-index:40;background:var(--surface);border-top:1px solid var(--outline-variant);display:flex;flex-direction:row-reverse;justify-content:space-around;align-items:center;padding:8px 4px calc(8px + env(safe-area-inset-bottom))}@media (min-width: 900px){.bottomnav{display:none}}.bottomnav-item{cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:2px;padding:6px 14px;border-radius:var(--radius-md);color:var(--on-surface-variant);font-size:11px;font-weight:600}.bottomnav-item.active{background:var(--primary-container);color:var(--on-primary-container)}.bento-card{background:var(--surface-container-lowest);border:1px solid var(--outline-variant);border-radius:var(--radius-md);padding:var(--sp-md);transition:transform .2s ease,box-shadow .2s ease}.bento-card.hoverable:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.grid{display:grid;gap:var(--sp-md)}.grid-2{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}.grid-3{grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}.eyebrow{font-size:12px;font-weight:600;letter-spacing:.04em;color:var(--secondary);text-transform:none}.btn{border-radius:var(--radius-md);font-weight:500;font-size:14px;padding:14px 24px;border:none;display:inline-flex;align-items:center;justify-content:center;gap:8px;transition:opacity .15s ease,background .15s ease,transform .1s ease}.btn:active{transform:scale(.97)}.btn-primary{background:var(--primary);color:var(--on-primary)}.btn-primary:hover{opacity:.9}.btn-primary:disabled{opacity:.4;cursor:not-allowed}.btn-accent{background:var(--accent);color:var(--on-accent)}.btn-accent:hover{opacity:.9}.btn-outline{background:transparent;border:2px solid var(--primary);color:var(--primary)}.btn-outline:hover{background:var(--surface-container-low)}.btn-ghost{background:transparent;color:var(--secondary);border:1px solid var(--outline-variant)}.btn-ghost:hover{background:var(--surface-container-low)}.btn-block{width:100%}.pill{display:inline-flex;align-items:center;gap:4px;padding:4px 12px;border-radius:var(--radius-full);font-size:12px;font-weight:600}.pill-neutral{background:var(--surface-container-low);border:1px solid var(--outline-variant);color:var(--on-surface-variant)}.pill-good{background:var(--success-bg);color:var(--success)}.pill-warn{background:var(--warning-bg);color:var(--warning)}.pill-bad{background:var(--error-container);color:var(--on-error-container)}.progress-track{width:100%;height:8px;background:var(--surface-container-highest);border-radius:var(--radius-full);overflow:hidden}.progress-fill{height:100%;background:var(--primary);border-radius:var(--radius-full);transition:width 1s ease-in-out}.choice-btn{display:flex;align-items:center;justify-content:space-between;width:100%;text-align:right;background:var(--surface-container-lowest);border:1.5px solid var(--outline-variant);border-radius:var(--radius-md);padding:14px 18px;font-size:16px;font-weight:500;margin-bottom:10px;transition:border-color .15s ease,background .15s ease}.choice-btn:hover:not(:disabled){border-color:var(--primary);background:var(--surface-container-low)}.choice-btn:disabled{cursor:default}.choice-btn.correct{background:var(--success-bg);border-color:var(--success)}.choice-btn.wrong{background:var(--error-container);border-color:var(--error)}.choice-dot{width:18px;height:18px;border-radius:50%;border:2px solid var(--outline-variant);flex-shrink:0}.field-input{width:100%;font-size:18px;padding:14px;border-radius:var(--radius-md);border:1.5px solid var(--outline-variant);text-align:center;background:var(--surface-container-lowest);color:var(--on-surface)}.field-input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px #4a6d7c26}.formula-chip{background:var(--surface-container-low);border-radius:var(--radius-md);padding:10px 16px;font-weight:600;color:var(--primary);font-size:14px}.hint-card{background:var(--tertiary-fixed);color:var(--on-tertiary-fixed-variant);border-radius:var(--radius-md);padding:12px 16px;font-size:14px;display:flex;gap:10px;align-items:flex-start}