:root{--bg:#f7f8f4;--surface:#fff;--ink:#25372f;--muted:#66746d;--line:#e2e7df;--green:#2b5848;--green-soft:#eaf0e5;--lime:#dcebad;--gold:#f0dfa8;--shadow:0 12px 36px #233b2b09;--red:#a13e39;--radius:20px;font-family:Inter,"Segoe UI",Arial,sans-serif;color:var(--ink);background:var(--bg);font-synthesis:none}
*{box-sizing:border-box}body{margin:0;font-size:15px;line-height:1.6}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}a{color:inherit;text-decoration:none}button{cursor:pointer}button:disabled{cursor:default;opacity:.65}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #b68524;outline-offset:4px}h1,h2,h3,p{margin-top:0}h1{font-size:38px;line-height:1.18;letter-spacing:-1.3px;font-weight:650}h2{font-size:23px;line-height:1.3;letter-spacing:-.5px;font-weight:650}h3{font-size:17px;line-height:1.4}p{margin-bottom:14px}small,.muted{color:var(--muted)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip{position:fixed;top:-100px;left:20px;background:var(--surface);padding:12px;z-index:99}.skip:focus{top:10px}
.sidebar{position:fixed;inset:0 auto 0 0;width:244px;background:var(--surface);border-right:1px solid var(--line);padding:33px 22px;display:flex;flex-direction:column;z-index:10}.brand{display:flex;align-items:center;gap:12px;padding:0 10px;font-size:25px;font-weight:750;line-height:1}.brand-icon{width:43px;height:44px;border-radius:13px;background:var(--green);color:white;font-size:35px;position:relative;padding:0 8px}.brand-icon span{font-size:17px;position:absolute;top:4px;right:4px;color:var(--lime)}.brand-sub{display:block;font-size:10px;letter-spacing:4px;margin-top:7px;font-weight:600}.side-label{font-size:9px;letter-spacing:1.6px;color:var(--muted);margin:51px 10px 13px;font-weight:650}nav{display:grid;gap:7px}nav a{padding:12px 14px;border-radius:11px;display:flex;gap:13px;align-items:center;font-size:14px;color:var(--muted)}nav a:hover{background:var(--bg)}nav a.active{background:var(--green-soft);color:var(--green);font-weight:650}nav svg{width:19px;height:19px;stroke:currentColor;fill:none;stroke-width:1.6;flex-shrink:0}.nav-count{margin-left:auto;font-size:11px;background:var(--surface);padding:0 6px;border-radius:5px}.sidebar-bottom{margin-top:auto;padding:23px 10px 0}.sidebar-bottom p{font-size:11px;line-height:1.8;color:var(--muted);margin:10px 0 20px}.sidebar-bottom a{font-size:11px;color:var(--muted)}.local-dot{font-size:11px;font-weight:650}.local-dot:before{content:'';display:inline-block;width:6px;height:6px;background:#719568;border-radius:50%;margin-right:7px}.shell{margin-left:244px}.topbar{height:85px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding:0 45px;background:var(--bg)}.top-label{font-size:12px;font-weight:600}.top-label .muted{padding:0 12px}.top-actions{display:flex;align-items:center;gap:15px}.search-button{display:flex;align-items:center;gap:10px;border:1px solid var(--line);background:var(--surface);color:var(--muted);font-size:12px;padding:9px 12px;border-radius:10px}.search-button>span:first-child{font-size:24px;line-height:20px}kbd{font:11px inherit;border:1px solid var(--line);border-radius:4px;padding:0 5px;margin-left:30px}.icon-button{border:1px solid var(--line);background:var(--surface);color:var(--ink);width:37px;height:37px;border-radius:10px;font-size:20px}.mobile-brand{display:none}main{max-width:1390px;margin:auto;padding:34px 45px 55px;min-height:calc(100vh - 150px)}.eyebrow{text-transform:uppercase;letter-spacing:2px;font-size:10px;font-weight:700;color:var(--green);margin-bottom:13px}.page-title{margin-bottom:10px}.page-sub{color:var(--muted);font-size:14px;max-width:720px}.welcome{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:25px}.date-pill{font-size:11px;color:var(--muted);border:1px solid var(--line);border-radius:30px;padding:7px 12px;white-space:nowrap}.hero{background:var(--green);color:#fff;border-radius:var(--radius);min-height:269px;padding:32px 35px;display:grid;grid-template-columns:1.3fr .8fr;position:relative;overflow:hidden}.hero h2{font-size:34px;font-weight:500;line-height:1.2;letter-spacing:-1px;max-width:420px;margin-bottom:13px}.hero p{font-size:13px;color:#e3eddf;max-width:380px;line-height:1.8}.hero .eyebrow{color:#deebb8;margin-bottom:14px}.button{border:1px solid transparent;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;gap:12px;padding:11px 18px;font-size:13px;font-weight:600;background:var(--green);color:#fff;line-height:1.5}.button:hover{filter:brightness(1.08)}.button.lime{background:var(--lime);color:#213e30}.button.white{background:var(--surface);color:var(--ink);border-color:var(--line)}.button.ghost{background:transparent;color:var(--ink);border-color:var(--line)}.button.danger{background:var(--red)}.button-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}.hero-art{position:relative;min-height:210px;display:flex;align-items:center;justify-content:center}.orbit{position:absolute;width:270px;height:270px;border:1px solid #ffffff1c;border-radius:50%}.orbit:after{content:'';position:absolute;inset:24px;border:1px solid #ffffff1c;border-radius:50%}.study-card{width:193px;height:185px;background:#f6f4e8;border-radius:13px;transform:rotate(-9deg);color:#2b5848;box-shadow:15px 15px 0 #1e4335;position:relative;padding:22px}.study-card small{font-size:8px;letter-spacing:2px;color:#526b5b}.study-card strong{font-size:21px;line-height:1.25;display:block;margin:14px 0}.paper-line{height:5px;background:#dfe4d5;width:95%;border-radius:4px;margin:8px 0}.paper-line.short{width:65%}.card-check{position:absolute;bottom:17px;right:18px;border-radius:50%;width:29px;height:29px;background:var(--lime);text-align:center;padding:2px}.float-tag{position:absolute;right:0;top:29px;background:#f0dfa8;color:#4d4930;padding:7px 11px;font-size:10px;border-radius:8px;transform:rotate(7deg);box-shadow:0 3px 10px #0001}.spark{position:absolute;left:18px;bottom:11px;color:var(--lime);font-size:39px}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin:20px 0 35px}.stat{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:17px 20px;display:flex;gap:14px;align-items:center}.stat-icon{display:grid;place-items:center;width:40px;height:40px;border-radius:12px;background:var(--green-soft);color:var(--green);font-size:21px}.stat strong{font-size:23px;font-weight:600;line-height:1}.stat p{font-size:11px;color:var(--muted);margin:5px 0 0}.section-head{display:flex;justify-content:space-between;gap:16px;align-items:center;margin-bottom:17px}.section-head h2{margin:0}.section-head p{margin:5px 0 0;font-size:12px;color:var(--muted)}.year-tabs{display:inline-flex;gap:3px;padding:4px;border:1px solid var(--line);border-radius:10px;background:var(--surface)}.year-tabs button{border:0;background:none;padding:7px 13px;font-size:12px;border-radius:7px;color:var(--muted);white-space:nowrap}.year-tabs button.active{background:var(--green);color:white}.subject-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:17px}.subject-card{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:22px;box-shadow:var(--shadow);position:relative;transition:transform .15s,border-color .15s}.subject-card:hover{transform:translateY(-3px);border-color:#99aa9b}.card-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.subject-icon{width:42px;height:42px;border-radius:12px;background:color-mix(in srgb,var(--subject) 12%,var(--surface));color:var(--subject);display:grid;place-items:center;font-size:22px;font-family:Georgia,serif;font-weight:bold}.code{font-size:10px;font-weight:650;color:var(--muted);border:1px solid var(--line);border-radius:6px;padding:2px 6px}.subject-card h3{margin-bottom:8px}.subject-card p{font-size:12px;line-height:1.7;color:var(--muted);min-height:41px}.card-meta{display:flex;justify-content:space-between;font-size:10px;color:var(--muted);margin-top:17px}.progress-track{height:4px;background:var(--line);border-radius:5px;overflow:hidden;margin-top:10px}.progress-track>span{display:block;height:100%;background:var(--subject,var(--green));transition:width .3s}.note{font-size:12px;color:var(--muted);padding:13px 17px;border-left:3px solid #b3c391;background:var(--green-soft);border-radius:0 9px 9px 0;margin:20px 0}.activity-banner{display:flex;justify-content:space-between;gap:20px;align-items:center;background:#eeefdf;border:1px solid #e2e6d3;border-radius:16px;padding:23px 26px;margin-top:27px}.activity-banner h3{margin-bottom:5px}.activity-banner p{font-size:12px;color:#5c685b;margin:0}.banner-icon{font-size:30px;margin-right:8px;color:#677943}.activity-banner>div{flex:1}footer{max-width:1390px;margin:auto;padding:0 45px 22px;font-size:10px;color:var(--muted);display:flex;justify-content:space-between;gap:15px}.breadcrumbs{font-size:11px;color:var(--muted);display:flex;gap:8px;flex-wrap:wrap;margin-bottom:22px}.breadcrumbs a{text-decoration:underline;text-underline-offset:3px}.chapter-list{display:grid;gap:12px}.chapter-row{display:flex;align-items:center;gap:17px;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:19px 21px}.chapter-row:hover{border-color:#8c9c8d}.chapter-number{font-size:14px;color:var(--muted);width:30px}.chapter-row h3{margin:0 0 5px}.chapter-row p{margin:0;font-size:12px;color:var(--muted)}.chapter-content{flex:1}.chip{display:inline-flex;border:1px solid var(--line);border-radius:30px;padding:3px 9px;font-size:10px;color:var(--muted);white-space:nowrap}.chip.done{background:var(--green-soft);color:var(--green)}.course-layout{display:grid;grid-template-columns:minmax(0,1fr) 220px;gap:25px}.article{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:32px;max-width:830px}.article h1{font-family:Georgia,serif;font-size:34px;font-weight:500;letter-spacing:-.6px;line-height:1.2}.article h2{font-size:21px;margin:29px 0 15px}.article p,.article li{font-size:14px;line-height:1.9}.article li{padding-left:4px;margin-bottom:12px}.article ul,.article ol{padding-left:23px}.definition{border-bottom:1px solid var(--line);padding:14px 0}.definition dt{font-weight:650;font-size:14px}.definition dd{font-size:13px;margin:5px 0 0;color:var(--muted);line-height:1.8}.example{background:var(--green-soft);border-radius:12px;padding:20px}.example strong{font-size:11px;text-transform:uppercase;letter-spacing:1px;color:var(--green)}.example p{margin:9px 0 0}.exercise{background:var(--bg);border:1px solid var(--line);padding:20px;border-radius:12px}.exercise textarea{min-height:90px;margin:10px 0;width:100%}.exercise details{margin-top:13px}.exercise summary{cursor:pointer;font-weight:600;color:var(--green);font-size:13px}.exercise details p{padding-top:12px}.course-aside{align-self:start;position:sticky;top:20px}.mini-panel{background:var(--surface);border:1px solid var(--line);padding:19px;border-radius:14px;margin-bottom:15px}.mini-panel h3{font-size:13px;margin:0 0 11px}.mini-panel p{font-size:11px;color:var(--muted)}.mini-panel a{display:block;color:var(--muted);font-size:12px;margin-bottom:10px}.mini-panel .button{display:flex;margin:9px 0 0;color:white}.mini-panel button{width:100%}.fave-button{border:1px solid var(--line);border-radius:9px;padding:9px;background:var(--surface);color:var(--ink);font-size:12px}.fave-button.selected{color:var(--green);background:var(--green-soft)}.filters{display:flex;gap:14px;flex-wrap:wrap;margin:24px 0}.field{display:flex;flex-direction:column;gap:5px;flex:1;min-width:150px}.field label{font-size:11px;font-weight:600}select,input,textarea{border:1px solid var(--line);border-radius:9px;padding:11px;background:var(--surface);color:var(--ink);max-width:100%}textarea{resize:vertical}.mode-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:22px 0}.mode-card{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:20px 15px;text-align:left;color:var(--ink)}.mode-card:hover{border-color:#98aa98}.mode-card.selected{border:2px solid var(--green);padding:19px 14px;background:var(--green-soft)}.mode-card strong{display:block;font-size:13px;margin:10px 0 3px}.mode-card span{font-size:21px;color:var(--green)}.mode-card small{font-size:10px;line-height:1.6;display:block}.activity-setup{max-width:1000px}.setup-footer{display:flex;align-items:center;justify-content:space-between;gap:20px;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:20px}.setup-footer p{font-size:12px;margin:0;color:var(--muted)}.quiz-wrap{max-width:800px;margin:0 auto}.quiz-status{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:var(--muted);gap:15px;margin-bottom:15px}.quiz-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:32px;margin-top:20px}.quiz-card h2{font-size:23px;line-height:1.5;margin:15px 0 23px}.choices{display:grid;gap:10px}.choice{display:flex;align-items:center;gap:12px;text-align:left;border:1px solid var(--line);background:var(--surface);color:var(--ink);padding:14px;border-radius:10px;font-size:14px}.choice:hover:not(:disabled){background:var(--green-soft)}.choice .letter{width:28px;height:28px;display:grid;place-items:center;border:1px solid var(--line);border-radius:7px;font-size:11px;flex-shrink:0}.choice.correct{background:var(--green-soft);border-color:var(--green);color:var(--ink)}.choice.wrong{background:#fbefed;border-color:var(--red);color:#813c38}.feedback{border:1px solid var(--line);border-radius:12px;padding:20px;margin-top:20px;background:var(--green-soft)}.feedback p{font-size:13px;line-height:1.8;margin:8px 0}.feedback.bad{background:#fbefed;color:#723732}.hint{color:var(--muted);font-size:12px;margin-top:19px}.hint summary{cursor:pointer}.hint p{margin-top:10px}.flash-definition{font-size:19px!important;font-family:Georgia,serif;text-align:center;padding:30px;border-radius:12px;background:var(--green-soft)}.answer-input{width:100%;margin-bottom:12px}.association-row{display:grid;grid-template-columns:1fr 1.7fr;align-items:center;gap:15px;margin-bottom:15px}.association-row label{font-weight:600;font-size:13px}.association-row select{font-size:12px;width:100%}.timer{font-variant-numeric:tabular-nums;color:var(--green);font-weight:bold}.timer.low{color:var(--red)}.score-circle{display:grid;place-items:center;border:9px solid var(--green-soft);width:125px;height:125px;border-radius:50%;font-size:29px;color:var(--green);font-weight:600;margin:10px auto 25px}.summary{text-align:center}.summary h1{font-size:30px}.summary .button-row{justify-content:center}.summary-list{text-align:left;margin-top:25px}.summary-item{padding:13px 0;border-bottom:1px solid var(--line);font-size:12px}.summary-item strong{display:block;margin-bottom:4px}.summary-item a{text-decoration:underline}.empty{text-align:center;padding:50px 25px;background:var(--surface);border:1px dashed var(--line);border-radius:16px}.empty p{color:var(--muted);font-size:13px}.progress-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:17px}.progress-card{background:var(--surface);border:1px solid var(--line);padding:22px;border-radius:15px}.progress-card h3{margin:0 0 10px}.progress-card p{font-size:12px;color:var(--muted);margin-bottom:5px}.history-list{display:grid;gap:10px}.history-item{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:15px;display:flex;justify-content:space-between;gap:16px;font-size:12px}.guide{max-width:900px}.guide section{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:25px;margin-top:18px}.guide h2{font-size:20px}.guide p,.guide li{font-size:13px;line-height:1.9}.guide a{color:var(--green);text-decoration:underline;text-underline-offset:3px}.guide table{border-collapse:collapse;width:100%;font-size:12px}.guide td,.guide th{text-align:left;border-bottom:1px solid var(--line);padding:10px 7px;vertical-align:top}.table-scroll{overflow:auto}.guide .button{text-decoration:none;color:white}.guide .ghost{color:var(--ink)}.coverage{margin:15px 0;border-top:1px solid var(--line);padding-top:15px}.coverage strong{font-size:13px}.coverage p{margin:5px 0}.storage-warning{background:#fff2cf;border:1px solid #e2cf93;border-radius:12px;padding:15px;font-size:12px;color:#624d1d;margin-bottom:15px}dialog{border:1px solid var(--line);border-radius:20px;background:var(--surface);color:var(--ink);box-shadow:0 24px 100px #0003;padding:26px;width:min(650px,calc(100% - 30px));max-height:85vh}dialog::backdrop{background:#17281f77;backdrop-filter:blur(4px)}.dialog-head{display:flex;justify-content:space-between;gap:15px;align-items:center}.dialog-head h2{font-size:22px;margin:0 0 15px}#search-input{width:100%;margin:10px 0}dialog .muted{font-size:11px}.search-result{display:block;border-top:1px solid var(--line);padding:13px 0}.search-result strong{font-size:14px;display:block}.search-result small{font-size:11px}.search-result:hover strong{color:var(--green)}#toast{position:fixed;bottom:25px;left:calc(50% + 100px);transform:translate(-50%,20px);padding:12px 20px;border-radius:12px;color:var(--surface);background:var(--ink);font-size:12px;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;z-index:99;max-width:85vw}#toast.show{opacity:1;transform:translate(-50%,0)}
[data-theme=dark]{--bg:#151f1b;--surface:#1e2b24;--ink:#e6eee5;--muted:#a6b7ab;--line:#36473c;--green:#b9d6ad;--green-soft:#2a3c2e;--lime:#dcebad;--shadow:0 12px 36px #0001;--red:#bf6962}[data-theme=dark] .hero{background:#284c3c}[data-theme=dark] .button{color:#183123}[data-theme=dark] .button.danger{color:#fff}[data-theme=dark] .button.white,[data-theme=dark] .button.ghost{color:var(--ink)}[data-theme=dark] .year-tabs button.active{color:#193024}[data-theme=dark] .brand-icon{background:#3e654d}[data-theme=dark] .activity-banner{background:#293528;border-color:var(--line)}[data-theme=dark] .activity-banner p{color:var(--muted)}[data-theme=dark] .subject-icon{color:#d6dfce;background:#344637}[data-theme=dark] .storage-warning{background:#40371e;color:#f1dfac;border-color:#756334}[data-theme=dark] .choice.wrong,[data-theme=dark] .feedback.bad{background:#402824;color:#f2c9c4}[data-theme=dark] .mini-panel .button{color:#193024}
@media(min-width:1550px){main{padding-top:43px}.hero{min-height:300px}.subject-card{padding:27px}.subject-card p{min-height:42px}}
@media(max-width:1150px){.sidebar{width:210px;padding-left:15px;padding-right:15px}.shell{margin-left:210px}main{padding:28px}.topbar{padding:0 28px}.subject-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.hero{grid-template-columns:1.2fr .8fr;padding:28px}.hero h2{font-size:29px}.study-card{width:165px;height:172px;padding:17px}.float-tag{right:-15px}.course-layout{grid-template-columns:minmax(0,1fr) 190px;gap:16px}.article{padding:24px}.mode-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:800px){.sidebar{width:76px;padding:24px 11px}.brand{padding:0;justify-content:center}.brand>span:last-child,.side-label,.sidebar-bottom,nav a>span{display:none}nav{margin-top:35px}nav a{padding:14px;justify-content:center}nav a svg{width:22px;height:22px}.shell{margin-left:76px}.top-label{display:none}.topbar{height:70px}.mobile-brand{display:block;font-size:13px;font-weight:650}.search-button>span:nth-child(2),kbd{display:none}.search-button{padding:4px 9px}.search-button>span:first-child{font-size:24px}.course-layout{grid-template-columns:1fr}.course-aside{position:static;display:grid;grid-template-columns:1fr 1fr;gap:12px}.mini-panel{margin:0}.hero-art{display:none}.hero{grid-template-columns:1fr}.hero h2{max-width:none}.hero p{max-width:470px}.welcome .date-pill{display:none}h1{font-size:32px}.stat{padding:14px}.stat-icon{display:none}.mode-grid{grid-template-columns:repeat(2,1fr)}.progress-grid{grid-template-columns:1fr}#toast{left:50%}}
@media(max-width:540px){.sidebar{position:fixed;top:auto;bottom:0;right:0;width:100%;height:64px;border-right:0;border-top:1px solid var(--line);padding:5px 7px;background:var(--surface)}.brand{display:none}nav{display:flex;justify-content:space-around;margin:0;gap:2px}nav a{display:flex;flex-direction:column;gap:2px;padding:5px 8px;min-width:53px;font-size:8px}nav a>span:not(.nav-count){display:block}nav a>span.nav-count{display:none}nav a svg{width:20px;height:20px}.shell{margin-left:0;padding-bottom:64px}main{padding:25px 18px 35px}.topbar{padding:0 18px;height:66px}.top-actions{gap:9px}.hero{padding:25px}.hero h2{font-size:30px}.hero p{font-size:12px}.welcome{margin-bottom:20px}.stats{gap:8px;margin-bottom:28px}.stat{padding:14px 10px;border-radius:11px}.stat strong{font-size:22px}.stat p{font-size:9px}.section-head{align-items:flex-start}.section-head h2{font-size:20px}.section-head p{font-size:11px}.year-tabs button{padding:6px 8px;font-size:10px}.subject-grid{grid-template-columns:1fr}.subject-card{padding:20px}.card-top{margin-bottom:15px}.subject-card p{min-height:0}.activity-banner{padding:21px;flex-wrap:wrap;gap:10px}.activity-banner .banner-icon{display:none}.activity-banner>div{flex-basis:100%}.activity-banner .button{width:100%;margin-top:8px}.article{padding:23px 19px}.article h1{font-size:29px}.article p,.article li{font-size:13px}.course-aside{grid-template-columns:1fr}.chapter-row{padding:16px;gap:10px}.chapter-row .chip{display:none}.chapter-number{width:22px;flex-shrink:0}.chapter-row h3{font-size:15px}.chapter-row p{font-size:11px}.quiz-card{padding:23px 18px}.quiz-card h2{font-size:20px}.choice{font-size:13px;padding:12px}.mode-card{padding:16px 12px}.mode-card.selected{padding:15px 11px}.setup-footer{flex-direction:column;align-items:stretch}.filters{gap:10px}.field{min-width:125px}.association-row{grid-template-columns:1fr;gap:7px}.guide section{padding:21px 17px}.guide table{min-width:500px}footer{padding:0 18px 20px;flex-direction:column;gap:3px}#toast{bottom:80px}.history-item{flex-direction:column;gap:5px}}
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