:root{color-scheme:light;--canvas: #f5f6f8;--surface: #ffffff;--surface-sunk: #f9fafb;--ink: #111827;--ink-soft: #5b6474;--ink-faint: #8a93a3;--rule: #e5e7eb;--rule-strong: #d0d5dd;--accent: #1d4ed8;--accent-hover: #1e40af;--accent-soft: #eef2ff;--on-accent: #ffffff;--focus: #1d4ed8;--math: #1d4ed8;--math-soft: #eef3ff;--arabic: #0f766e;--arabic-soft: #e7f5f2;--positive: #067647;--positive-soft: #ecfdf3;--warning: #b54708;--warning-soft: #fffaeb;--negative: #b42318;--negative-soft: #fef3f2;--neutral: #475467;--neutral-soft: #f2f4f7;--r-sm: 6px;--r: 10px;--r-lg: 14px;--shadow-sm: 0 1px 2px rgba(16, 24, 40, .05);--shadow: 0 1px 3px rgba(16, 24, 40, .06), 0 1px 2px rgba(16, 24, 40, .04);--shadow-lift: 0 8px 24px -6px rgba(16, 24, 40, .12);--maxw: 1180px;--pad: clamp(16px, 4vw, 40px);--edge: max(var(--pad), calc((100vw - var(--maxw)) / 2));--header-h: 68px;--section-y: clamp(72px, 10vh, 128px);--ease: cubic-bezier(.16, 1, .3, 1);--sans: "Instrument Sans", ui-sans-serif, system-ui, "Helvetica Neue", Arial, sans-serif;--naskh: "Noto Naskh Arabic", "Geeza Pro", serif}*,*:before,*:after{box-sizing:border-box}html{overflow-x:clip;scroll-behavior:smooth;scroll-padding-block-start:calc(var(--header-h) + 16px)}body{margin:0;min-width:320px;background:var(--surface);color:var(--ink);font-family:var(--sans);font-size:1rem;line-height:1.6;font-synthesis:none;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}h1,h2,h3{margin:0;font-weight:600;letter-spacing:-.022em;line-height:1.15;text-wrap:balance}p{margin:0;text-wrap:pretty}a{color:inherit}a,button{touch-action:manipulation;-webkit-tap-highlight-color:rgba(29,78,216,.14)}img{display:block;max-width:100%}button,input{font:inherit}:where(a,button,input):focus-visible{outline:2px solid var(--focus);outline-offset:2px}.skip-link{position:fixed;top:12px;left:12px;z-index:20;padding:10px 14px;border-radius:var(--r-sm);color:var(--on-accent);background:var(--accent);font-weight:600;text-decoration:none;transform:translateY(calc(-100% - 20px))}.skip-link:focus-visible{transform:translateY(0)}.shell{width:min(var(--maxw),calc(100% - 2 * var(--pad)));margin-inline:auto}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}.eyebrow{margin:0;color:var(--ink-soft);font-size:.8125rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase}.muted{color:var(--ink-soft)}.hint{color:var(--ink-faint);font-size:.8125rem;white-space:nowrap}.first-cap:first-letter{text-transform:uppercase}.first-cap{display:inline-block}.nowrap{white-space:nowrap}.brand{display:inline-flex;align-items:center;gap:9px;min-height:44px;flex-shrink:0;text-decoration:none;white-space:nowrap;line-height:1}.brand__mark{width:44px;height:44px;flex:0 0 44px}.brand__wordmark{display:grid;gap:5px}.brand__name{color:#263832;font-size:1.5rem;font-weight:700;letter-spacing:-.055em}.brand__suffix{color:#596760;font-size:.5625rem;font-weight:600;letter-spacing:.24em;text-transform:uppercase}.btn{min-height:44px;display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 18px;border:1px solid transparent;border-radius:var(--r-sm);font-size:.9375rem;font-weight:600;line-height:1.2;white-space:nowrap;text-decoration:none;cursor:pointer;transition:background .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease),box-shadow .16s var(--ease)}.btn--sm{min-height:36px;padding:7px 13px;font-size:.875rem}.btn--block{width:100%}.btn--primary{color:var(--on-accent);background:var(--accent);box-shadow:var(--shadow-sm)}.btn--primary:hover{background:var(--accent-hover)}.btn--secondary{color:var(--ink);background:var(--surface);border-color:var(--rule-strong);box-shadow:var(--shadow-sm)}.btn--secondary:hover{background:var(--surface-sunk);border-color:var(--ink-faint)}.btn--ghost{color:var(--ink-soft);background:transparent}.btn--ghost:hover{color:var(--ink);background:var(--neutral-soft)}button:disabled{cursor:wait;opacity:.7}.masthead{position:sticky;top:0;z-index:10;min-height:var(--header-h);display:flex;align-items:center;justify-content:space-between;gap:24px;background:#ffffffeb;-webkit-backdrop-filter:saturate(1.4) blur(10px);backdrop-filter:saturate(1.4) blur(10px)}.masthead:after{content:"";position:absolute;inset-inline:calc(-1 * var(--edge));bottom:0;height:1px;background:var(--rule);opacity:0}.masthead nav{display:flex;align-items:center;gap:clamp(16px,2.2vw,28px)}.masthead nav a:not(.btn){color:var(--ink-soft);font-size:.9375rem;font-weight:500;text-decoration:none;white-space:nowrap;transition:color .16s var(--ease)}.masthead nav a:not(.btn):hover{color:var(--ink)}.hero{padding-block:clamp(56px,10vh,112px) clamp(64px,10vh,120px)}.hero h1{margin-block:18px 0;font-size:clamp(2.5rem,6vw,4.75rem);letter-spacing:-.038em;line-height:1.08}.hero h1 span{display:block}.hero__intro{margin-block:24px 0;max-width:48ch;color:var(--ink-soft);font-size:clamp(1.0625rem,1.3vw,1.1875rem)}.hero__actions{display:flex;flex-wrap:wrap;gap:12px;margin-block-start:32px}.hero__actions .btn{min-height:48px;padding-inline:22px;font-size:1rem}.subjects{padding-block:var(--section-y);border-block-start:1px solid var(--rule)}.lede{max-width:54ch;margin-block-end:clamp(36px,5vw,56px)}.lede h2,.method h2{font-size:clamp(1.875rem,3.2vw,2.75rem)}.lede p{margin-block:16px 0;color:var(--ink-soft);font-size:clamp(1.0625rem,1.3vw,1.125rem)}.subjects__grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(16px,2.5vw,28px)}.subject{--subject: var(--math);--subject-soft: var(--math-soft);display:flex;flex-direction:column;padding:clamp(24px,3vw,36px);border:1px solid var(--rule);border-radius:var(--r-lg);background:var(--surface);box-shadow:var(--shadow)}.subject--arabic{--subject: var(--arabic);--subject-soft: var(--arabic-soft)}.subject__specimen{display:grid;align-items:center;justify-items:start;min-height:clamp(96px,9vw,120px);margin-block-end:24px;padding-inline:20px;border-radius:var(--r);color:var(--subject);background:var(--subject-soft)}.subject__specimen math{font-size:clamp(1.25rem,2.2vw,1.875rem)}.naskh{font-family:var(--naskh);font-weight:400;line-height:1.5}.subject__specimen .naskh{font-size:clamp(1.75rem,3vw,2.5rem)}.subject h3{font-size:clamp(1.5rem,2.2vw,1.875rem)}.subject__line{margin-block:8px 0;color:var(--ink-soft)}.subject__list{margin-block:24px 0;padding:0;list-style:none}.subject__list li{display:flex;align-items:center;gap:12px;padding-block:10px;border-block-start:1px solid var(--rule);font-size:.9375rem}.subject__list li:before{content:"";flex:none;width:6px;height:6px;border-radius:50%;background:var(--subject)}.subject__link{align-self:start;display:inline-flex;align-items:center;gap:8px;margin-block-start:24px;color:var(--subject);font-weight:600;text-decoration:none;transition:gap .2s var(--ease)}.subject__link:hover{gap:12px}.method{padding-block:var(--section-y);padding-inline:var(--edge);background:var(--canvas)}.method h2{max-width:20ch}.method__steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(16px,2.5vw,28px);margin-block:clamp(36px,5vw,56px) 0;padding:0;list-style:none;counter-reset:step}.method__steps li{counter-increment:step;padding:clamp(22px,2.6vw,30px);border:1px solid var(--rule);border-radius:var(--r-lg);background:var(--surface)}.method__steps li:before{content:counter(step);display:grid;place-items:center;width:28px;height:28px;margin-block-end:18px;border-radius:50%;color:var(--accent);background:var(--accent-soft);font-size:.875rem;font-weight:600}.method__steps strong{font-size:1.1875rem;font-weight:600;letter-spacing:-.015em}.method__steps p{margin-block:8px 0;color:var(--ink-soft);font-size:.9375rem}.access{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.9fr);align-items:start;gap:clamp(32px,6vw,80px);padding-block:var(--section-y)}.access h2{font-size:clamp(1.75rem,2.8vw,2.5rem)}.access p{margin-block:18px 0;color:var(--ink-soft)}.access .btn{margin-block-start:28px}.access__panel{padding:clamp(22px,2.6vw,32px);border:1px solid var(--rule);border-radius:var(--r-lg);background:var(--surface-sunk)}.access__panel dl{margin:0}.access__panel div{padding-block:16px;border-block-start:1px solid var(--rule)}.access__panel div:first-child{padding-block-start:0;border-block-start:0}.access__panel div:last-child{padding-block-end:0}.access__panel dt{font-weight:600;font-size:.9375rem}.access__panel dd{margin:4px 0 0;color:var(--ink-soft);font-size:.9375rem;line-height:1.55}.colophon{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:28px;padding-block:32px 48px;border-block-start:1px solid var(--rule)}.colophon p{color:var(--ink-soft);font-size:.875rem}.colophon__links{display:flex;gap:24px}.colophon__links a{color:var(--ink-soft);font-size:.875rem;font-weight:500;text-decoration:none}.colophon__links a:hover{color:var(--ink)}.auth-page{min-height:100svh;display:grid;place-content:center;justify-items:center;gap:28px;padding:clamp(32px,7vw,64px) var(--pad);background:var(--canvas)}.auth-card{width:min(100vw - 2 * var(--pad),440px);padding:clamp(24px,5vw,40px);border:1px solid var(--rule);border-radius:var(--r-lg);background:var(--surface);box-shadow:var(--shadow)}.auth-card h1{font-size:1.625rem}.auth-card__intro{margin-block:8px 24px;color:var(--ink-soft);font-size:.9375rem}.auth-form{display:grid}.google-signin{display:grid;gap:8px}.google-signin__button{display:flex;justify-content:center;min-height:44px}.google-signin__status,.google-signin__fallback{color:var(--ink-soft);font-size:.875rem;text-align:center}.auth-divider{display:flex;align-items:center;gap:12px;margin-block:20px;color:var(--ink-faint);font-size:.8125rem}.auth-divider:before,.auth-divider:after{content:"";flex:1;height:1px;background:var(--rule)}.auth-form label{margin-block:14px 6px;font-size:.875rem;font-weight:600}.auth-form label:first-child{margin-block-start:0}.auth-form input{width:100%;min-height:44px;padding:10px 12px;border:1px solid var(--rule-strong);border-radius:var(--r-sm);color:var(--ink);background:var(--surface);box-shadow:var(--shadow-sm);transition:border-color .16s var(--ease),box-shadow .16s 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.field-help{margin:0}.teacher-check{display:flex;gap:10px;align-items:center;font-size:.875rem;padding-block:6px;cursor:pointer}.teacher-check input{width:18px;height:18px;accent-color:var(--accent);flex-shrink:0}.teacher-form__footer{display:flex;justify-content:flex-start;padding-block-start:4px}.teacher-items{display:grid;gap:10px}.teacher-item{border:1px solid var(--rule);border-radius:var(--r-sm);overflow:hidden}.teacher-item summary{display:flex;align-items:center;justify-content:space-between;gap:16px;cursor:pointer;padding:16px;font-size:.9375rem;font-weight:600;list-style:none}.teacher-item summary:before{content:"›";color:var(--ink-soft)}.teacher-item[open] summary:before{transform:rotate(90deg)}.teacher-item summary>span:first-of-type{flex:1;min-width:0;overflow-wrap:anywhere}.teacher-item small{display:block;color:var(--ink-soft);font-weight:400;font-size:.8125rem;margin-block-start:4px}.teacher-item[open] summary{border-block-end:1px solid var(--rule);background:var(--canvas)}.teacher-item>.teacher-form{padding:18px}.teacher-add{margin-block-start:18px;padding:18px;border:1px dashed var(--rule-strong);border-radius:var(--r-sm)}.teacher-add>summary{color:var(--accent);font-weight:600;cursor:pointer;list-style:none}.teacher-add[open]>summary{margin-block-end:20px}.teacher-error{color:var(--negative);border-color:var(--negative)}@media(max-width:960px){.teacher-layout{grid-template-columns:minmax(0,1fr)}.teacher-guide{position:static}}@media(max-width:640px){.teacher-form__row{grid-template-columns:minmax(0,1fr)}.teacher-item summary{gap:8px;padding:12px}.teacher-item>.teacher-form,.teacher-add{padding:14px}.teacher-tabs a{padding:8px 10px}.page-header{flex-wrap:wrap}}.auth-form input:focus-visible{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px #1d4ed82e}.field-help{margin-block-start:6px;color:var(--ink-soft);font-size:.8125rem}.form-error{min-height:1.5em;margin-block:12px 8px;color:var(--negative);font-size:.875rem}.auth-card__switch{margin-block-start:20px;padding-block-start:20px;border-block-start:1px solid var(--rule);color:var(--ink-soft);font-size:.875rem;text-align:center}.auth-card__switch a,.auth-page__footer a{color:var(--accent);font-weight:600;text-decoration:none}.auth-card__switch a:hover,.auth-page__footer a:hover{text-decoration:underline;text-underline-offset:3px}.auth-page__footer{font-size:.875rem}.auth-page__footer a{color:var(--ink-soft)}.auth-card__legal{margin-block-start:16px;color:var(--ink-soft);font-size:.8125rem;text-align:center}.auth-card__legal a{color:inherit;text-underline-offset:2px}.legal{min-height:100svh;background:var(--canvas)}.legal__header{min-height:var(--header-h);display:flex;align-items:center;justify-content:space-between;gap:16px}.legal__back,.legal__footer a{color:var(--ink-soft);font-size:.875rem;font-weight:500;text-decoration:none}.legal__back:hover,.legal__footer a:hover{color:var(--ink)}.legal__main{padding-block:24px 48px}.legal__article{max-width:760px;margin-inline:auto;padding:clamp(24px,5vw,48px);border:1px solid var(--rule);border-radius:var(--r-lg);background:var(--surface);box-shadow:var(--shadow-sm)}.legal__article h1{font-size:clamp(1.75rem,4vw,2.25rem)}.legal__meta{margin-block-start:8px;color:var(--ink-faint);font-size:.875rem}.legal__intro{margin-block-start:20px;color:var(--ink-soft);font-size:1.0625rem}.legal__article h2{margin-block:36px 10px;font-size:1.1875rem}.legal__article p,.legal__article li{color:#374151}.legal__article ul{margin:0;padding-inline-start:20px}.legal__article li+li{margin-block-start:8px}.legal__article a{color:var(--accent);text-underline-offset:3px}.legal__footer{display:flex;justify-content:center;flex-wrap:wrap;gap:24px;padding-block:0 48px}.app{min-height:100svh;background:var(--canvas)}.app-header{position:sticky;top:0;z-index:10;border-block-end:1px solid var(--rule);background:#fffffff0;-webkit-backdrop-filter:saturate(1.4) blur(10px);backdrop-filter:saturate(1.4) blur(10px)}.app-header__inner{min-height:var(--header-h);display:flex;align-items:center;gap:clamp(16px,3vw,40px)}.app-nav{display:flex;align-items:center;gap:4px;margin-inline-end:auto}.app-nav a{padding:7px 12px;border-radius:var(--r-sm);color:var(--ink-soft);font-size:.9375rem;font-weight:500;text-decoration:none;transition:background .16s var(--ease),color .16s var(--ease)}.app-nav a:hover{color:var(--ink);background:var(--neutral-soft)}.app-nav a.active{color:var(--accent);background:var(--accent-soft)}.account{display:flex;align-items:center;gap:10px;font-size:.9375rem}.account__avatar{display:grid;place-items:center;width:32px;height:32px;border-radius:50%;color:var(--accent);background:var(--accent-soft);font-size:.8125rem;font-weight:600}.account__name{font-weight:500}.app-main{padding-block:clamp(28px,5vw,48px) 80px}.page-header{display:flex;align-items:flex-end;justify-content:space-between;flex-wrap:wrap;gap:16px 24px;margin-block-end:28px}.page-header h1{font-size:clamp(1.625rem,3vw,2.125rem)}.page-header p{margin-block-start:6px;color:var(--ink-soft)}.notice{margin-block-end:24px;padding:12px 16px;border:1px solid #fedf89;border-radius:var(--r);color:var(--warning);background:var(--warning-soft);font-size:.9375rem}.notice--info{margin-block:32px 0;border-color:#c7d7fe;color:#1e3a8a;background:var(--accent-soft)}.panel{padding:clamp(18px,2.4vw,24px);border:1px solid var(--rule);border-radius:var(--r-lg);background:var(--surface);box-shadow:var(--shadow-sm)}.panel--flush{padding:0;overflow:hidden}.table-scroll{overflow-x:auto;overscroll-behavior-inline:contain}.table-scroll:focus-visible{outline:2px solid var(--focus);outline-offset:3px}.panel__title{margin-block-end:16px;color:var(--ink-soft);font-size:.8125rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase}.section{margin-block-start:40px}.section__head{display:flex;align-items:center;gap:10px;margin-block-end:14px}.section__head h2{font-size:1.1875rem}.count{min-width:24px;padding:1px 8px;border-radius:999px;color:var(--ink-soft);background:var(--neutral-soft);font-size:.8125rem;font-weight:600;font-variant-numeric:tabular-nums;text-align:center}.badge{display:inline-flex;align-items:center;gap:6px;width:fit-content;padding:2px 9px;border-radius:999px;font-size:.8125rem;font-weight:500;white-space:nowrap}.badge:before{content:"";width:6px;height:6px;border-radius:50%;background:currentColor}.badge--positive{color:var(--positive);background:var(--positive-soft)}.badge--warning{color:var(--warning);background:var(--warning-soft)}.badge--negative{color:var(--negative);background:var(--negative-soft)}.badge--neutral{color:var(--neutral);background:var(--neutral-soft)}.subject-tag{display:inline-block;width:fit-content;padding:2px 8px;border-radius:var(--r-sm);color:var(--math);background:var(--math-soft);font-size:.75rem;font-weight:600;letter-spacing:.02em;white-space:nowrap}.subject-tag--arabic{color:var(--arabic);background:var(--arabic-soft)}.empty-state{display:grid;justify-items:start;gap:8px}.empty-state h1,.empty-state h3{font-size:1.0625rem}.empty-state p{max-width:56ch;margin-block-end:8px;color:var(--ink-soft)}.empty-state--page{max-width:560px;margin:clamp(24px,8vh,80px) auto 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56px}.student-welcome{align-items:start;flex-direction:column;gap:12px}.student-welcome>time{font-size:.8125rem}.student-top{grid-template-columns:minmax(0,1fr)}.student-subscription{gap:10px}.student-course-grid{grid-template-columns:minmax(0,1fr)}.student-section{margin-block-start:28px}.student-paper{padding:22px}}@media(max-width:420px){.student-shortcuts{gap:6px}.student-shortcuts a{flex:1;justify-content:space-between;gap:6px;padding-inline:10px;font-size:.8125rem}.student-next{padding:22px}.student-next__actions{align-items:start;flex-direction:column;gap:8px}.student-course{grid-template-columns:58px minmax(0,1fr);padding:16px;gap:14px}.student-course__cover,.student-course__cover .naskh{font-size:1.5rem}.student-documents>li{grid-template-columns:36px minmax(0,1fr);gap:10px}.student-document-mark{width:36px}.student-document__action{grid-column:2;justify-self:start}.student-history li{flex-wrap:wrap}}