:root{font-family:system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--text);background:var(--bg);font-size:16px;line-height:1.6}*{box-sizing:border-box}body{margin:0}button,input,textarea,select{font:inherit}button{cursor:pointer;border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:9px;padding:8px 14px;font-size:.875rem}button:hover{background:var(--soft);border-color:var(--accent)}button:focus-visible,a:focus-visible{outline:3px solid var(--accent);outline-offset:2px}button:disabled{opacity:.5;cursor:default}.primary{background:var(--accent);color:var(--on-accent);border-color:var(--accent)}.primary:hover{background:var(--accent-hover)}.danger{color:#b33939}header{height:76px;padding:0 32px;background:var(--surface);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;gap:12px}.brand{font-size:1.3rem;font-weight:750;color:var(--accent);text-decoration:none}header>div{display:flex;gap:8px}.layout{display:grid;grid-template-columns:260px 1fr;min-height:calc(100vh - 76px)}aside{background:var(--surface);border-right:1px solid var(--border);padding:26px 18px;display:flex;flex-direction:column}.side-title{display:flex;align-items:center;justify-content:space-between;font-weight:700;padding:0 10px 12px}.side-title button{padding:3px 10px}nav .exam{margin:16px 0 4px;font-weight:650;display:flex;align-items:center;justify-content:space-between;padding:0 10px}nav .exam button{padding:0 8px}nav .subject{width:100%;display:flex;align-items:center;justify-content:space-between;text-align:left;border:0;margin:3px 0;padding:10px 14px}nav .subject.active{background:var(--soft);color:var(--accent);font-weight:650}nav .subject small{color:var(--muted)}.storage{margin-top:auto;padding:48px 10px 0;color:var(--muted);font-size:.8rem}main{padding:36px 42px;max-width:1300px;width:100%;margin:auto}.breadcrumb{font-size:.875rem;color:var(--muted)}.page-head{display:flex;align-items:center;justify-content:space-between;gap:16px;margin:8px 0 24px}h1{font-size:1.8rem;margin:0;letter-spacing:-.04em}h2{font-size:1.2rem;margin:0 0 16px}.actions{display:flex;flex-wrap:wrap;gap:8px}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:24px}.stat{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:18px}.stat span{display:block;font-size:.875rem;color:var(--muted)}.stat strong{display:block;font-size:1.7rem;margin-top:4px}.panel{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:24px;margin-bottom:22px}.panel-head{display:flex;align-items:center;justify-content:space-between;gap:12px}.panel-head h2{margin:0}.filters{display:flex;gap:8px;flex-wrap:wrap;margin:20px 0}.filters button.active{background:var(--soft);border-color:var(--accent);color:var(--accent)}.card-row{display:flex;align-items:center;gap:14px;padding:16px 0;border-top:1px solid var(--border)}.card-row .text{flex:1;min-width:0}.card-row .text p{margin:0;overflow-wrap:anywhere}.meta{font-size:.8rem;color:var(--muted)}.badge{font-size:.8rem;background:var(--soft);padding:3px 9px;border-radius:6px}.card-row img{width:56px;height:45px;object-fit:contain}.empty{text-align:center;padding:40px 12px;color:var(--muted)}.empty strong{display:block;color:var(--text);font-size:1.15rem}.note{width:100%;border:1px solid var(--border);border-radius:9px;padding:14px;resize:vertical;margin-top:16px;min-height:120px;line-height:1.7}.note-status{font-size:.8rem;color:var(--muted)}.study-card{padding:40px;min-height:360px;text-align:center}.study-card .question{font-size:1.45rem;font-weight:650;white-space:pre-wrap;overflow-wrap:anywhere;margin:28px 0}.study-card img{max-width:100%;max-height:330px;object-fit:contain;border-radius:8px}.answer{border-top:1px solid var(--border);margin-top:28px;padding-top:24px;white-space:pre-wrap;font-size:1.15rem;overflow-wrap:anywhere}.ratings{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:24px}.ratings button{padding:19px 10px;font-weight:650;font-size:1rem}.ratings span{font-size:1.8rem;display:block;margin-bottom:5px}.ratings .yes{background:#ecf8f2;border-color:#bddfcc}.ratings .maybe{background:#fff7e7;border-color:#eadbb6}.ratings .no{background:#fff0f0;border-color:#eacbcb}.progress{height:6px;background:var(--border);border-radius:5px;margin:16px 0 28px}.progress div{height:100%;background:var(--accent);border-radius:5px}.study-top{display:flex;justify-content:space-between;align-items:center}.study-top span{color:var(--muted);font-size:.875rem}dialog{border:1px solid var(--border);border-radius:16px;width:min(580px,94vw);max-height:90vh;padding:26px;color:var(--text)}dialog::backdrop{background:rgba(23,36,58,.44)}.dialog-head{display:flex;justify-content:space-between;align-items:center}.dialog-head h2{margin:0}label{display:block;font-size:.875rem;font-weight:650;margin-top:18px}label textarea{width:100%;border:1px solid var(--border);border-radius:8px;padding:12px;margin-top:6px;resize:vertical}input[type=file]{max-width:100%;display:block;margin-top:8px;font-size:.875rem}select{padding:8px;border:1px solid var(--border);border-radius:8px;margin-left:14px}form>.primary{margin-top:18px;width:100%}#formError{color:#b33939;font-size:.875rem}#qpreview img,#apreview img{max-width:100%;max-height:140px;margin-top:10px}#toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#1d304e;color:var(--on-accent);border-radius:10px;padding:10px 20px;display:none;z-index:5}.text-link{color:var(--accent)}.welcome{padding:60px 32px;text-align:center}.welcome p{color:var(--muted)} @media(max-width:800px){header{padding:0 16px}.layout{grid-template-columns:1fr}aside{border-right:0;border-bottom:1px solid var(--border);padding:16px}nav{display:flex;flex-wrap:wrap;gap:8px;align-items:center}nav .exam{margin:4px}nav .subject{width:auto}.storage{display:none}main{padding:24px 16px}.page-head{align-items:flex-start;flex-direction:column}.stats{gap:8px}.stat{padding:12px}.stat strong{font-size:1.4rem}.stat span{font-size:.8rem}.panel{padding:18px}.panel-head{flex-wrap:wrap}.study-card{padding:24px 16px}.ratings{gap:8px}.ratings button{font-size:.875rem;padding:16px 5px}.card-row{flex-wrap:wrap}h1{font-size:1.5rem}}
.pagination{display:flex;justify-content:center;align-items:center;gap:8px;flex-wrap:wrap;padding-top:20px;border-top:1px solid var(--border)}.pagination .active{background:var(--accent);color:var(--on-accent);border-color:var(--accent)}.ratings span{margin:0;font-size:2.2rem}.ratings button{min-height:86px;transition:transform .12s,box-shadow .12s}.ratings button.pressed{opacity:1;transform:scale(1.08);box-shadow:0 0 0 5px #2bbf8125}.ratings .maybe.pressed,.ratings .no.pressed{transform:scale(1.03)}.study-card{transition:background .2s,border-color .2s}.reward-success{animation:success-pulse .5s ease-out;background:#e8fbf1;border-color:#35b87e}.reward-maybe{background:#fff9e9;border-color:#e7c76d}.reward-no{background:#fff4f4;border-color:#e5aaaa}.reward-particle{position:fixed;z-index:20;width:8px;height:8px;border-radius:3px;pointer-events:none;animation:particle .6s ease-out forwards}@keyframes success-pulse{0%{transform:scale(1)}35%{transform:scale(1.015);box-shadow:0 0 0 8px #2bbf8115}100%{transform:scale(1)}}@keyframes particle{0%{opacity:1;transform:translate(-50%,-50%) scale(1)}100%{opacity:0;transform:translate(var(--dx),var(--dy)) rotate(160deg) scale(.3)}}@media(prefers-reduced-motion:reduce){.ratings button,.study-card{transition:none}.ratings button.pressed{transform:none}.reward-success,.reward-particle{animation:none}}
:root{--bg:#f6f8fc;--surface:#fff;--text:#17243a;--muted:#66758c;--border:#dce3ee;--accent:#315ecb;--accent-hover:#244ea9;--soft:#eaf0ff;--on-accent:#fff;color-scheme:light}
:root[data-theme=green]{--bg:#f2f0eb;--accent:#006241;--accent-hover:#1e3932;--soft:#d4e9e2;--border:#cbdcd5;--text:#1e3932;--muted:#51665e}
:root[data-theme=purple]{--bg:#f7f5fc;--accent:#7345b6;--accent-hover:#59348f;--soft:#eee5fa;--border:#e1daed;--text:#302041;--muted:#766385}
:root[data-theme=rose]{--bg:#fff5f3;--accent:#9f4054;--accent-hover:#823144;--soft:#ffe4e1;--border:#f1cec9;--text:#4f2c35;--muted:#84616b}
:root[data-theme=dark]{--bg:#121923;--surface:#1c2634;--text:#e7edf6;--muted:#aebbd0;--border:#354459;--accent:#93b3ff;--accent-hover:#bad0ff;--soft:#2b3d5d;--on-accent:#142039;color-scheme:dark}
[hidden]{display:none!important}.header-actions{flex-wrap:wrap;align-items:center}.theme-label{margin:0;font-weight:500;color:var(--muted);font-size:.875rem}#themeSelect{margin:0;width:96px;background:var(--surface);color:var(--text)}#tree select{width:100%;margin:0;background:var(--surface);color:var(--text);padding:11px;font-size:1rem}#tree .selector-label{margin:16px 0 8px;color:var(--muted);font-size:.875rem}#tree .selector-row{display:flex;align-items:center;justify-content:space-between;margin-top:16px}#tree .selector-row label{margin:0 0 8px}#tree .selector-row button{padding:2px 10px;margin-bottom:8px}.filter-group{display:flex;gap:16px;align-items:center;margin:16px 0}.filter-label{width:48px;flex-shrink:0;font-size:.875rem;color:var(--muted)}.filter-group .filters{margin:0}.filters button[aria-pressed=true]{box-shadow:inset 0 0 0 1px var(--accent)}input,textarea,select{color:var(--text);background:var(--surface)}.ratings span{font-family:system-ui,sans-serif;font-weight:700}.ratings .yes{color:#126543}.ratings .maybe{color:#7b5b09}.ratings .no{color:#9d3030}:root[data-theme=dark] .ratings .yes{background:#173b30;color:#95ebc0;border-color:#3b7862}:root[data-theme=dark] .ratings .maybe{background:#40381c;color:#f1d97c;border-color:#77662d}:root[data-theme=dark] .ratings .no{background:#42272c;color:#f5b0b6;border-color:#854852}:root[data-theme=dark] .reward-success{background:#173b30}:root[data-theme=dark] .reward-maybe{background:#40381c}:root[data-theme=dark] .reward-no{background:#42272c}:root[data-theme=dark] .danger{color:#ffb0b0}dialog{background:var(--surface)}
@media(max-width:800px){header{height:auto;min-height:76px;padding-top:12px;padding-bottom:12px;flex-wrap:wrap}.layout{min-height:calc(100vh - 76px)}#tree{display:grid;grid-template-columns:1fr 1fr;column-gap:12px;align-items:end}#tree>.selector-label{grid-column:1;grid-row:1}#examSelect{grid-column:1;grid-row:2}#tree .selector-row{grid-column:2;grid-row:1;margin-top:0}#subjectSelect{grid-column:2;grid-row:2}.filter-group{gap:8px}.filter-group .filters{gap:6px}.filter-group button{padding:8px 10px}}
:root[data-theme=ocean]{--bg:#f0f8fb;--accent:#08758b;--accent-hover:#075a6b;--soft:#d9f1f5;--border:#cce3ea;--text:#173d47;--muted:#55757e}
:root[data-theme=amber]{--bg:#fff9ef;--accent:#8f5808;--accent-hover:#6e4206;--soft:#ffedc9;--border:#ebdbbe;--text:#493517;--muted:#7d6b4e}
:root{--done-bg:#e2f5e9;--done-text:#145b36;--done-border:#93cfaa;--hold-bg:#fff0c9;--hold-text:#735109;--hold-border:#dfbf63;--todo-bg:#ffe6e7;--todo-text:#963844;--todo-border:#e4a2a9;--a-bg:#fbe4e6;--a-text:#943b47;--a-border:#dea0aa;--b-bg:#fff0ce;--b-text:#735009;--b-border:#dbbd65;--c-bg:#e2edff;--c-text:#315f9a;--c-border:#a2bfe8}
:root[data-theme=dark]{--done-bg:#193b2c;--done-text:#a7ecc0;--done-border:#598f6c;--hold-bg:#40351b;--hold-text:#f8dc8a;--hold-border:#947d42;--todo-bg:#442a31;--todo-text:#ffc0c5;--todo-border:#a16874;--a-bg:#442a31;--a-text:#ffc0c5;--a-border:#a16874;--b-bg:#40351b;--b-text:#f8dc8a;--b-border:#947d42;--c-bg:#243852;--c-text:#b4d2ff;--c-border:#618bbd}
.stat-0{background:var(--soft);border-color:var(--border)}.stat-1{background:var(--done-bg);border-color:var(--done-border);color:var(--done-text)}.stat-2{background:var(--hold-bg);border-color:var(--hold-border);color:var(--hold-text)}.stat-3{background:var(--todo-bg);border-color:var(--todo-border);color:var(--todo-text)}.stat span{color:inherit;opacity:.85}
.filter-label{background:var(--soft);border:1px solid var(--border);border-radius:8px;padding:8px 0;text-align:center;color:var(--text)}.filters button[data-status="1"]{--chip-bg:var(--done-bg);--chip-text:var(--done-text);--chip-border:var(--done-border)}.filters button[data-status="2"]{--chip-bg:var(--hold-bg);--chip-text:var(--hold-text);--chip-border:var(--hold-border)}.filters button[data-status="3"]{--chip-bg:var(--todo-bg);--chip-text:var(--todo-text);--chip-border:var(--todo-border)}.filters button[data-importance="A"]{--chip-bg:var(--a-bg);--chip-text:var(--a-text);--chip-border:var(--a-border)}.filters button[data-importance="B"]{--chip-bg:var(--b-bg);--chip-text:var(--b-text);--chip-border:var(--b-border)}.filters button[data-importance="C"]{--chip-bg:var(--c-bg);--chip-text:var(--c-text);--chip-border:var(--c-border)}.filters button{background:var(--chip-bg,var(--soft));color:var(--chip-text,var(--text));border-color:var(--chip-border,var(--border))}.filters button.active{background:var(--chip-bg,var(--soft));color:var(--chip-text,var(--accent));border-color:var(--chip-text,var(--accent));font-weight:700}.filters button[aria-pressed=true]{box-shadow:inset 0 0 0 1px var(--chip-text,var(--accent))}.filters button[aria-pressed=false]{opacity:.64}.filters button:hover{opacity:1}
.settings{position:relative;margin-left:auto}.settings summary{list-style:none;cursor:pointer;width:44px;height:44px;border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:10px;display:grid;place-items:center;font-size:1.6rem;line-height:1}.settings summary::-webkit-details-marker{display:none}.settings summary:hover,.settings[open] summary{background:var(--soft)}.settings summary:focus-visible{outline:3px solid var(--accent);outline-offset:3px}.settings-panel{position:absolute;right:0;top:54px;width:230px;z-index:30;background:var(--surface);border:1px solid var(--border);border-radius:12px;box-shadow:0 12px 32px #14203925;padding:18px;display:flex;flex-direction:column;gap:12px}.settings-panel .theme-label{color:var(--text);font-weight:650}.settings-panel #themeSelect{width:100%}.settings-panel button{text-align:left}
#tree .selector-row{justify-content:flex-start;gap:8px}#tree .selector-row label{margin:0}#tree .selector-row button{margin:0}#tree .exam-selector{margin-top:0;margin-bottom:8px}#tree .subject-selector{margin-bottom:8px}#tree .exam-selector label{margin:0}
@media(max-width:800px){#tree .exam-selector{grid-column:1;grid-row:1;margin:0 0 8px}#tree .subject-selector{grid-column:2;grid-row:1;margin:0 0 8px}.settings-panel{width:min(230px,calc(100vw - 32px))}}
.settings summary{border:0;background:transparent;border-radius:50%}.settings summary:hover,.settings[open] summary{background:transparent;color:var(--accent)}.settings-panel{width:260px}.theme-choices{display:grid;grid-template-columns:1fr 1fr;gap:8px}.theme-choices button{display:flex;align-items:center;gap:9px;text-align:left;padding:9px 10px}.theme-choices button[aria-pressed=true]{background:var(--soft);border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent);font-weight:700}.theme-dot{display:inline-block;width:14px;height:14px;border-radius:50%;flex-shrink:0;box-shadow:0 0 0 1px #ffffff70}.dot-blue{background:#315ecb}.dot-green{background:#006241}.dot-purple{background:#7345b6}.dot-rose{background:#efadb4}.dot-dark{background:#33465f}.dot-ocean{background:#08758b}.dot-amber{background:#b57514}.grade-A{background:var(--a-bg);color:var(--a-text);border:1px solid var(--a-border)}.grade-B{background:var(--b-bg);color:var(--b-text);border:1px solid var(--b-border)}.grade-C{background:var(--c-bg);color:var(--c-text);border:1px solid var(--c-border)}.card-row .badge{font-weight:750;min-width:32px;text-align:center}.reward-screen{position:fixed;inset:0;pointer-events:none;z-index:40;background:radial-gradient(ellipse at 50% 65%,#40ef97 0%,#00b76b 65%,#006241 100%);animation:screen-green .62s ease-out forwards}@keyframes screen-green{0%{opacity:0}14%{opacity:.58}38%{opacity:.32}100%{opacity:0}}@media(prefers-reduced-motion:reduce){.reward-screen{display:none;animation:none}}
.filter-label{background:transparent;border:0;border-radius:0;color:var(--muted);padding:8px 0}.selector-row label{order:0}.selector-row button{order:1}
.url-answer{white-space:normal;text-align:left}.reader-toolbar{display:flex;justify-content:space-between;gap:16px;align-items:center;padding-bottom:16px}.reader-content{max-height:65vh;overflow:auto;padding:0 10px 10px 0;line-height:1.85;font-size:1rem;overflow-wrap:anywhere}.reader-title{font-size:1.3rem;line-height:1.5;margin:0 0 20px}.reader-content p{margin:0 0 1.1em}.reader-content h1,.reader-content h2,.reader-content h3{margin:1.5em 0 .6em}.reader-content img{display:block;max-width:100%;height:auto;max-height:none;margin:18px auto}.reader-content figure{margin:18px 0}.reader-content figcaption{font-size:.875rem;color:var(--muted)}.reader-content table{display:block;overflow:auto;max-width:100%;border-collapse:collapse;margin:20px 0}.reader-content th,.reader-content td{border:1px solid var(--border);padding:8px 12px}.reader-content pre{white-space:pre-wrap;padding:12px;background:var(--soft);border-radius:8px}.reader-content blockquote{border-left:3px solid var(--accent);margin:16px 0;padding-left:16px;color:var(--muted)}.reader-content a{color:var(--accent)}.reader-error{color:var(--muted)}

[hidden]{display:none!important}.login-screen{min-height:100vh;display:grid;place-items:center;padding:20px}.login-screen form{width:min(100%,420px)}.login-screen input{display:block;width:100%;padding:12px;margin:8px 0 16px;border:1px solid var(--line,#ddd);border-radius:8px;font:inherit}.login-screen p{line-height:1.7}#loginError{color:#b33}#cloudStatus{line-height:1.7}

.account-links{display:flex;gap:10px;margin-top:14px}.account-links button{flex:1}.account-links button:disabled{opacity:.45;cursor:not-allowed}#passwordDialog{width:min(92vw,440px)}#passwordDialog input{display:block;width:100%;padding:12px;margin:8px 0 16px;border:1px solid #ccc;border-radius:8px;font:inherit}#resetMessage{line-height:1.7}#resetError{color:#b33}