/* EdAI: a calm working notebook. Semantic tokens, no remote fonts. */
:root{color-scheme:light;--bg:#f3f5f7;--paper:#ffffff;--ink:#192c39;--muted:#566975;--line:#dce3e8;--green:#176851;--mint:#e6f2ec;--orange:#875016;--sand:#fff2df;--red:#ad3434;--shadow:0 4px 20px #192c3905;font-family:system-ui,"Segoe UI",sans-serif;font-size:16px}
body{line-height:1.55}h1{font-size:clamp(1.8rem,2.7vw,2.5rem);line-height:1.18;letter-spacing:-.045em}h2{font-size:1.6rem}h3{font-size:1.1rem}.small,small{font-size:.8125rem}.eyebrow,.tiny-label{font-size:.6875rem;letter-spacing:.12em;line-height:1.7}.muted{color:var(--muted)}
.btn{min-height:44px;padding:11px 19px;font-size:.875rem;border-radius:12px;transition:background .15s,border-color .15s,box-shadow .15s}.btn.primary{box-shadow:0 3px 7px #17685116}.btn.primary:hover{background:#10523f;border-color:#10523f}.btn:not(.primary):hover{background:var(--mint);border-color:var(--green)}.link-button{font-size:.875rem;min-height:44px}.icon-button{width:44px;height:44px;color:var(--muted);background:var(--bg)}
input,textarea,select{font-size:1rem;min-height:46px;border-color:#9aaab5;border-radius:11px;background:var(--paper);color:var(--ink)}label{font-size:.875rem}textarea{line-height:1.8}input:focus,textarea:focus,select:focus{border-color:var(--green);box-shadow:0 0 0 3px color-mix(in srgb,var(--green) 18%,transparent)}:is(button,a,input,textarea,select):focus-visible{outline:3px solid var(--green);outline-offset:3px}.check input{min-height:24px;min-width:24px;margin:0}.check{font-size:.8125rem;gap:12px}
.auth-layout{grid-template-columns:1.08fr 1fr}.auth-story{background:#e7efeb;padding:42px clamp(30px,6vw,100px);gap:38px}.auth-story:after{display:none}.brand{font-size:38px;letter-spacing:-2px}.brand i{display:none}.auth-story h1{font-size:clamp(2.3rem,4.3vw,4.3rem);font-weight:650;line-height:1.08;max-width:650px;margin:22px 0}.auth-story p{color:#455f54;font-size:1rem}.auth-story small{font-size:.75rem;color:#455f54}.sample-note{max-width:410px;padding:27px 30px 25px 38px;border:1px solid #cbd9d4;border-radius:16px;background-color:#fcfefd;background-image:linear-gradient(#dce8e466 1px,transparent 1px),linear-gradient(90deg,#dce8e466 1px,transparent 1px);background-size:24px 24px;box-shadow:0 14px 30px #254c3c0d;transform:rotate(-2deg);margin:36px 0 18px}.sample-note:before{content:"";position:absolute;left:24px;top:0;bottom:0;border-left:1px solid #ba6d6d55}.handwritten{font-family:"Cambria Math",Cambria,Georgia,serif;font-size:1.8rem!important;color:#233c32!important;line-height:1.7}.sample-tip{font-size:.8125rem;color:#176851;border-top-color:#b2c9bd;background:#fcfefde8}.auth-form{background:var(--paper);padding:40px}.auth-card{max-width:400px}.auth-card h2{font-size:2rem;line-height:1.2;letter-spacing:-.04em}.auth-card>.small{border-top:1px solid var(--line);padding-top:20px;line-height:1.7}.auth-card .wide{margin-top:12px;min-height:48px}
.sidebar{width:248px;background:var(--paper);padding:30px 20px}.sidebar .brand{margin:0 14px 42px}.workspace-label{font-size:.6875rem;color:var(--muted);letter-spacing:.1em}.nav-button{min-height:46px;font-size:.875rem;color:var(--muted);border-radius:11px;padding:11px 14px;margin:5px 0}.nav-button:hover{background:var(--bg)}.nav-button.active{background:var(--mint);box-shadow:inset 3px 0 var(--green);color:var(--green)}.nav-icon{display:grid;place-items:center;width:21px;height:21px}.nav-icon svg{width:20px;height:20px}.trust-dot span,.user-pill small{font-size:.75rem}.user-pill b{font-size:.8125rem}.user-pill>span:first-child{background:var(--mint);color:var(--green);width:40px;height:40px}.main-wrap{margin-left:248px;width:calc(100% - 248px);min-width:0}header{height:76px;background:var(--paper);padding:0 clamp(24px,3.2vw,54px)}.breadcrumb{font-size:.8125rem}.breadcrumb b{color:var(--ink)}.local-badge{font-size:.75rem;background:var(--mint);color:var(--green);border-color:var(--line)}main{padding:40px clamp(24px,3.2vw,54px);max-width:1480px}.page-top{align-items:flex-end;margin-bottom:30px}.page-top p{font-size:.9375rem;max-width:680px;line-height:1.7}.page-top h1{max-width:780px}.page-top>.btn{flex-shrink:0}.panel,.stat,.task-card{background:var(--paper);border-color:var(--line);border-radius:18px;box-shadow:var(--shadow)}.panel{padding:27px}.panel-head{flex-wrap:wrap;margin-bottom:24px}.panel-head span{font-size:.75rem}.stats-grid{gap:16px}.stat{padding:23px}.stat-label{font-size:.8125rem;line-height:1.4}.stat-label>span{display:none}.stat-number{font-size:2.4rem;line-height:1.2;font-weight:650;font-variant-numeric:tabular-nums;margin:17px 0 10px}.stat-foot{font-size:.75rem;color:var(--muted)}.stat-foot.green{color:var(--green)}.next-action{border:1px solid #bdd4c8;background:var(--mint);padding:27px 30px;border-radius:18px;position:relative;gap:24px}.next-action h3{font-size:1.4rem;letter-spacing:-.025em}.next-action p{font-size:.875rem;color:var(--muted);max-width:650px}.topic-line{font-size:.875rem;gap:16px;flex-wrap:wrap}.topic-line span{font-size:.75rem}.progress-track{height:6px;background:var(--bg)}.progress-fill{background:var(--green)}.activity-day{font-size:.6875rem;color:var(--muted)}.activity-bar{background:#8ab7a2}.mini-note{font-size:.8125rem;background:var(--bg);color:var(--muted)}.attempt-row b{font-size:.875rem}.attempt-row small,.attempt-row .date{font-size:.75rem;color:var(--muted)}.attempt-row{border-color:var(--line)}
.chip{font-size:.8125rem;min-height:44px;background:var(--paper);color:var(--muted);padding:10px 17px}.chip.active{background:var(--ink);color:var(--paper)}.task-card{padding:25px;min-height:230px;transition:border-color .15s,box-shadow .15s}.task-card:hover{border-color:#9ab7aa;box-shadow:0 5px 20px #192c390b}.task-card .meta{font-size:.75rem;gap:12px;flex-wrap:wrap}.task-card p{font-size:1rem;overflow-wrap:anywhere}.badge{font-size:.75rem;border-radius:7px;padding:5px 9px;white-space:normal}.badge.gray{background:var(--bg);color:var(--muted)}.practice-item{font-size:.875rem;border-radius:12px;background:var(--paper);color:var(--ink);min-width:0}.practice-item:hover{border-color:var(--green)}.practice-item.solved{background:var(--mint)}.practice-item small,.input-help{font-size:.75rem}.explanation{font-size:.9375rem;background:var(--sand);color:var(--ink);border-left-color:var(--orange);border-radius:0 10px 10px 0}.notice{background:var(--sand);color:var(--orange);font-size:.875rem}.setting-row,.list-line p{font-size:.875rem}.setting-row span,.report-kpis span,.link-row small{font-size:.8125rem}.report-kpis strong{font-variant-numeric:tabular-nums}.text-pre{font-size:.875rem;color:var(--muted);overflow-wrap:anywhere}.solution,.code-box{background:var(--bg);color:var(--ink);font-size:.9375rem;overflow-wrap:anywhere}.review-note{background:var(--bg);font-size:.875rem}.result-box{font-size:.9375rem}.result-box.needs_correction{background:var(--bg)}.result-box.incorrect{background:var(--sand)}dialog{background:var(--paper);color:var(--ink);border-radius:22px;padding:30px;max-height:calc(100dvh - 32px)}.task-statement{font-size:1.4rem;overflow-wrap:anywhere}.empty{padding:50px 24px}.empty p{font-size:.9375rem}.empty-icon{color:var(--green)}footer{font-size:.75rem;color:var(--muted);line-height:1.6}.loading{padding:70px 20px}.skip-link{position:fixed;top:8px;left:8px;z-index:1000;padding:12px 18px;border-radius:10px;background:var(--paper);color:var(--ink);transform:translateY(-150%)}.skip-link:focus{transform:none}
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@media(max-width:720px){.auth-layout{display:block}.auth-story{display:none}.auth-form{min-height:100dvh;padding:32px 24px}.auth-card:before{content:"edai";display:block;color:var(--green);font-size:2rem;font-weight:750;letter-spacing:-.06em;margin-bottom:32px}.sidebar{position:relative;inset:auto;width:100%;padding:16px 16px 12px;display:block;border-right:0;border-bottom:1px solid var(--line);height:auto}.sidebar .brand{font-size:30px;margin:0 8px 14px}.sidebar nav{display:flex;overflow-x:auto;gap:6px;padding-bottom:5px;scrollbar-width:thin}.nav-button{min-height:44px;padding:10px 13px;margin:0;width:auto;white-space:nowrap;flex-shrink:0;font-size:.8125rem}.nav-button.active{box-shadow:inset 0 -3px var(--green)}.nav-icon{width:18px}.main-wrap{margin:0;width:100%}header{height:auto;min-height:56px;padding:12px 20px;flex-wrap:wrap}.breadcrumb{font-size:.75rem}main{padding:28px 20px}.page-top{align-items:flex-start;gap:18px}.page-top h1{font-size:1.9rem;overflow-wrap:anywhere}.page-top p{font-size:.9375rem}.stats-grid{gap:12px}.stat{padding:18px}.stat-number{font-size:2rem}.stat-label{font-size:.75rem}.stat-foot{font-size:.75rem}.next-action{padding:24px;align-items:flex-start;flex-direction:column}.next-action .btn{width:100%}.panel{padding:22px}.task-grid,.student-grid{grid-template-columns:minmax(0,1fr)}.topic-line{gap:5px}.topic-line span{display:block}.report-kpis{grid-template-columns:1fr}.practice-list{flex-direction:column}.panel-head{align-items:flex-start}.setting-row{overflow-wrap:anywhere}footer{padding:20px}dialog{padding:22px}.toolbar .btn{flex-wrap:wrap}.card-title{flex-wrap:wrap}}
@media(prefers-color-scheme:dark){:root{color-scheme:dark;--bg:#101b20;--paper:#19282e;--ink:#e5edf1;--muted:#afc0c8;--line:#384b54;--green:#8ed7b8;--mint:#203e33;--orange:#f0c38c;--sand:#3e3021;--red:#ffaaaa;--shadow:none}.auth-story{background:#193129}.auth-story p,.auth-story small{color:#b5ccbf}.sample-note{background-color:#223b30;border-color:#486453;background-image:linear-gradient(#78978416 1px,transparent 1px),linear-gradient(90deg,#78978416 1px,transparent 1px)}.handwritten{color:#e0efe6!important}.sample-tip{background:#223b30;color:var(--green)}.btn.primary{background:#8ed7b8;color:#102b20;border-color:#8ed7b8}.btn.primary:hover{background:#b0e8cf;border-color:#b0e8cf}.btn{background:var(--paper)}.next-action{border-color:#486453}.btn.danger{color:var(--red);border-color:#a76a6a}.toast{background:#e5edf1;color:#192c39}.toast.error{background:#f6b9b9}.result-box{border-color:#486453}.result-box.incorrect{border-color:#735c3d}.student-avatar{background:var(--mint);color:var(--green)}.chip.active{background:var(--ink);color:var(--bg)}.auth-card .small{color:var(--muted)}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
@media(prefers-reduced-transparency:reduce){dialog::backdrop{backdrop-filter:none;background:#162820e8}}
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@media print{body{color:#111;background:white}.panel,.stat{border-color:#aaa;box-shadow:none}.skip-link{display:none}}
.next-action>.btn{flex-shrink:0}.page-top>div{min-width:0}.dashboard-grid>*,.two-col>*{min-width:0}