:root{color-scheme:light;--bg:#fff;--panel:#fff;--line:#e2e4e7;--text:#242629;--muted:#676b72;--accent:#303030;--soft:#ededed;--shadow:0 8px 36px #00000010}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.65 'Segoe UI',system-ui,sans-serif}button,input,textarea,select{font:inherit}button,a,input,textarea,select{outline-offset:4px}a{color:var(--accent);text-underline-offset:4px}button{cursor:pointer;border:1px solid var(--line);border-radius:11px;padding:11px 17px;background:var(--panel);color:var(--text);transition:background .18s,border-color .18s,box-shadow .18s,transform .18s}button:hover:not(:disabled){border-color:var(--accent);box-shadow:0 3px 12px #0000000d;transform:translateY(-1px)}button:active:not(:disabled){transform:translateY(0)}button:disabled{opacity:.55;cursor:default}button:focus-visible,a:focus-visible{outline:3px solid var(--accent)}input,select{width:100%;padding:11px 12px;color:var(--text);border:1px solid var(--line);border-radius:9px;background:#fbfcf9}input:focus,textarea:focus,select:focus{outline:2px solid var(--accent);outline-offset:2px}textarea{resize:vertical;width:100%;min-height:110px;border:0;background:transparent;color:var(--text);line-height:1.7;padding:9px 0;margin:10px 0}textarea::placeholder{color:#8c978f}textarea:focus{outline:0}textarea:focus-visible{box-shadow:0 2px 0 #7f9d84}.app{display:grid;grid-template-columns:254px minmax(0,1fr);min-height:100vh}.sidebar{padding:35px 23px 23px;background:#193c32;color:#c5d5c9;display:flex;flex-direction:column;gap:23px;position:sticky;top:0;height:100vh;align-self:start;border-right:1px solid #294d40}.brand{font-size:27px;font-weight:700;letter-spacing:-1.1px;text-decoration:none;color:#e7f2db;display:flex;align-items:center;gap:10px}.tagline{font-size:12px;color:#9db4a6;margin:-16px 0 20px}.sidebar nav{display:grid;gap:8px}.nav{display:flex;align-items:center;gap:10px;color:#b9cfc1;text-decoration:none;padding:13px;border-radius:10px;font-size:13px}.nav.active{background:#dcecbd;color:#244535;font-weight:650;box-shadow:0 3px 9px #12291f25}.nav:not(.active):hover{background:#284b3e}.source-panel{border-top:1px solid #36574a;padding-top:25px;margin-top:12px}.source-panel label{font-size:10px;letter-spacing:1.5px;text-transform:uppercase;color:#c2d4c8;font-weight:700}.source-panel select{background:#24493b;border-color:#456354;color:#e3ecdf;margin:12px 0 0;font-size:12px;padding:12px 8px}.source-panel p{font-size:12px;line-height:1.7;color:#a5bdad;margin:12px 0 18px}.source-panel a{color:#d9eac8;font-size:11px}.sidebar-bottom{margin-top:auto;padding-top:20px;border-top:1px solid #36574a;font-size:12px;color:#d4e1d3}.sidebar-bottom p{color:#a3bda8;font-size:10px;margin-bottom:0;display:flex;align-items:center;gap:7px}.sidebar-bottom p:before{content:'';width:6px;height:6px;border-radius:100%;background:#a7c887;flex-shrink:0}.sidebar .quiet{color:#a9c2ad;font-size:10px}main{max-width:1130px;padding:42px 56px 24px;width:100%;margin:0 auto}.topline{display:flex;align-items:center;justify-content:space-between;gap:16px;border-bottom:1px solid var(--line);padding-bottom:19px;margin-bottom:35px;font-size:11px;color:var(--muted)}.session-badge{display:flex;align-items:center;gap:7px;background:#e8edde;color:#536646;padding:5px 11px;border-radius:20px;font-size:10px;font-weight:600}.session-badge:before{content:'';width:5px;height:5px;background:#72975a;border-radius:50%}header{position:relative;padding:0 0 3px}h1{font-size:clamp(39px,4.6vw,62px);font-weight:500;letter-spacing:-2.4px;line-height:1.12;margin:13px 0 18px}h1 em{font-family:Georgia,serif;font-weight:400;color:var(--accent)}.eyebrow{font-size:10px;font-weight:750;letter-spacing:2px;color:#73856a}.intro{font-size:14px;color:var(--muted);margin:0;max-width:450px}.modes{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:7px;background:#e9ece3;border:1px solid #e0e5da;padding:5px;border-radius:14px;margin:29px 0 18px}.modes button{font-size:11px;line-height:1.5;padding:12px 7px;border:1px solid transparent;background:transparent;border-radius:9px;box-shadow:none;white-space:normal}.modes [aria-pressed=true]{background:#fff;border-color:#dde2d7;color:#31543e;box-shadow:0 2px 5px #273b2910;font-weight:650}.composer{padding:24px 26px 22px;border:1px solid #d7dfd1;border-radius:20px;background:#fff;box-shadow:var(--shadow)}.composer>label{font-weight:650;font-size:14px}.compose-footer{display:flex;align-items:center;gap:13px;flex-wrap:wrap;margin-top:20px}.compose-footer label{font-size:11px;color:var(--muted);display:flex;align-items:center;gap:8px}.compose-footer select{width:55px;padding:7px}.hint{font-size:12px;color:var(--muted);flex:1}.compose-footer .hint{font-size:10px}.primary{background:#2c5841;color:#fff;border:1px solid #2c5841;font-weight:600;font-size:12px;padding:12px 19px;box-shadow:0 3px 7px #31543a15}.primary:hover:not(:disabled){background:#204c36;color:#fff;border-color:#204c36}.quiet{border:0;background:transparent;padding:6px;font-size:11px;color:var(--muted);box-shadow:none!important}.status{font-size:12px;color:var(--accent);min-height:20px;margin:13px 3px}.status:empty{min-height:0;margin:0}#selected-notes{border:1px dashed #d8e1d0;background:#f8faf4;padding:13px 15px;border-radius:11px;font-size:11px}#selected-notes strong{font-size:10px;text-transform:uppercase;letter-spacing:1px;color:#536a4e}#selected-notes p{font-size:11px;color:var(--muted);margin:5px 0 8px}#selected-notes a{font-size:10px}#selection-chips{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:6px}#selection-chips:empty{display:none}#selection-chips button{font-size:10px;background:#e5edd9;color:#405936;border:1px solid #d2dec4;max-width:100%;overflow-wrap:anywhere;text-align:left;padding:6px 10px;border-radius:7px}.welcome-card{padding:24px 0;display:grid;grid-template-columns:40px 1fr;column-gap:14px;align-items:start;border-bottom:1px solid var(--line);margin-top:9px}.welcome-star{grid-column:1;grid-row:1/4;display:grid;place-items:center;background:#e8ecdf;border:1px solid #dce3d1;width:39px;height:39px;border-radius:12px;font-size:25px;color:#6f875a}.welcome-card h2{font-size:15px;margin:0 0 4px}.welcome-card p{font-size:12px;color:var(--muted);margin:0}.suggestions{display:flex;gap:8px;flex-wrap:wrap;margin-top:13px;grid-column:2}.suggestions button{font-size:10px;background:transparent;padding:7px 11px;border-radius:20px}h2{font-size:24px;font-weight:550;letter-spacing:-.7px;line-height:1.35}h3{font-size:17px;font-weight:600;letter-spacing:-.4px}h4{font-size:13px}.response{padding:26px;background:#fff;border:1px solid var(--line);border-radius:18px;margin:20px 0;box-shadow:var(--shadow)}.response h2{font-size:17px}.question{color:#65814f;font-size:11px;margin:0 0 16px;font-weight:600}.answer{white-space:pre-wrap;overflow-wrap:anywhere;font-size:14px}.source{border-top:1px solid var(--line);padding:13px 0;font-size:11px}.source p{white-space:pre-wrap;color:var(--muted);max-height:240px;overflow:auto}.source summary{cursor:pointer;color:var(--accent)}.quiz-item{padding:22px 0;border-top:1px solid var(--line)}.options{display:grid;gap:8px}.options button{text-align:left;font-size:13px}.correct{border-color:#88af80;background:#e3efdd}.wrong{border-color:#c99888;background:#f7e8e1}.explanation{font-size:12px;color:var(--muted)}.flashcard{padding:17px 19px;background:#fff;border:1px solid var(--line);border-radius:12px;margin:10px 0;transition:background .15s}.flashcard[open]{background:#f5f8ed;border-color:#c8d7bc}.flashcard summary{cursor:pointer;font-weight:600;font-size:13px}.flashcard p{white-space:pre-wrap;font-size:14px}.flashcard small{font-size:10px;color:var(--muted)}.library{margin-top:37px;padding-top:3px;scroll-margin-top:25px}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:15px}.section-heading h2{margin:6px 0;font-size:26px}.section-heading>button{font-size:11px;background:#e6eddb;border-color:#d4dfc9;color:#3b5930;font-weight:600}.library>.hint{font-size:12px;margin:9px 0 21px;max-width:540px}#lecture-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:20px 0}#lecture-list>button{position:relative;min-height:78px;text-align:left;padding:19px 35px 19px 48px;font-size:12px;box-shadow:0 3px 15px #29413105;overflow-wrap:anywhere}#lecture-list>button:before{content:'▤';position:absolute;left:17px;top:24px;font-size:19px;color:#7b9564}#lecture-list>button:after{content:'↗';position:absolute;right:16px;top:25px;color:#91a085}#lecture-reader{overflow-wrap:anywhere}#lecture-reader>button{font-size:10px;margin-bottom:16px}.saved-notes{padding:20px;border:1px solid var(--line);border-radius:14px;background:#fff}.saved-notes>summary{color:var(--accent);font-weight:600;font-size:13px;cursor:pointer}.saved-notes>button{font-size:11px;margin-top:14px}.saved-notes p{white-space:pre-wrap;max-height:400px;overflow:auto;font-size:13px;color:#5d6c61}.note-page{border-top:1px solid var(--line);margin-top:17px;padding-top:17px}.note-page label{display:flex;gap:10px;align-items:center;font-size:12px;font-weight:600;cursor:pointer;color:var(--accent)}.note-page input{width:16px;height:16px;accent-color:#447448}#notes-form{padding:24px;background:#fff;border:1px solid var(--line);border-radius:16px;margin:22px 0;box-shadow:var(--shadow)}#notes-form label{display:block;margin-bottom:16px;font-size:12px;font-weight:600}#notes-form input{margin-top:6px;font-weight:400}#notes-text{border:1px solid var(--line);border-radius:9px;padding:12px;background:#fbfcf9;font-size:13px}input[type=file]{font-size:11px}input[type=file]::file-selector-button{border:0;background:#e5ebdd;color:#405c34;padding:7px 12px;border-radius:6px;margin-right:10px;cursor:pointer}#library-status{font-size:12px;color:var(--accent)}#draft-status{font-size:11px;color:var(--muted)}footer{display:flex;align-items:center;justify-content:space-between;gap:15px;font-size:10px;color:#839080;border-top:1px solid var(--line);margin:35px 0 0;padding-top:18px}.auth-shell{max-width:440px;background:#fff;border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow);padding:36px;margin:9vh auto}.auth-shell .brand{color:#31573e;margin-bottom:12px}.auth-plans-link{display:inline-block;margin:0 0 20px;color:var(--accent);font-size:12px;text-decoration:none}.auth-plans-link:hover{text-decoration:underline}.auth-shell h1{font-size:39px;letter-spacing:-1.5px}.auth-shell label{display:block;font-size:12px;font-weight:600;margin-top:18px}.auth-shell input{margin-top:6px}.auth-shell p{font-size:12px;color:var(--muted)}.auth-shell .primary{width:100%;margin-top:25px}.auth-shell .eyebrow{display:block}[hidden]{display:none!important}@media(min-width:1450px){main{padding-top:50px}.composer{padding:29px 32px}}@media(max-width:1050px){.app{grid-template-columns:220px minmax(0,1fr)}main{padding:30px}.sidebar{padding:30px 17px}.modes{grid-template-columns:repeat(2,minmax(0,1fr))}.compose-footer .hint{flex-basis:100%;order:3}}@media(max-width:760px){.app{display:block}.sidebar{position:relative;height:auto;padding:20px;gap:15px}.brand{font-size:24px}.tagline{margin:-13px 0 0}.sidebar nav{display:flex;gap:7px}.nav{font-size:12px;padding:10px 12px}.source-panel{margin:0;padding-top:15px}.source-panel select{margin-top:8px}.source-panel p{margin:8px 0}.sidebar-bottom{display:flex;align-items:center;flex-wrap:wrap;gap:8px;padding-top:12px}.sidebar-bottom p{margin:0 0 0 auto}.sidebar-bottom p:before{display:none}main{padding:25px 20px}.topline{margin-bottom:28px;padding-bottom:15px}h1{font-size:44px;letter-spacing:-1.7px}.composer{padding:20px}.intro{font-size:13px}.modes{margin-top:24px;grid-template-columns:repeat(4,minmax(0,1fr))}.modes button{font-size:10px;padding:10px 3px}.compose-footer .primary{margin-left:auto}.section-heading h2{font-size:24px}#lecture-list{grid-template-columns:1fr}.auth-shell{margin:30px auto;max-width:calc(100% - 32px);padding:28px}.welcome-card{grid-template-columns:32px 1fr;gap:12px}.welcome-star{width:32px;height:32px}footer{align-items:flex-start}.session-badge{font-size:9px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}button{transition:none}}

/* Personalization and interaction */
:root{--accent-wash:#ededed;--motion-time:320ms;--reading-scale:1}.top-actions{display:flex;align-items:center;gap:10px}#open-settings{font-size:11px;padding:7px 12px;background:transparent}.study-controls{display:flex;gap:12px;margin:0 0 14px;flex-wrap:wrap}.study-controls label{flex:1;min-width:130px;font-size:10px;color:var(--muted);font-weight:600}.study-controls select{font-size:11px;padding:8px 10px;margin-top:4px;background:transparent}.compose-footer #count{width:65px;padding:7px}.settings-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px 16px;margin:24px 0}.settings-grid label{font-size:12px;font-weight:600}.settings-grid select,.settings-grid input{margin-top:6px;font-size:13px}dialog{color:var(--text);background:var(--panel);border:1px solid var(--line);border-radius:24px;padding:30px;width:min(540px,calc(100% - 28px));max-height:85vh;overflow:auto;box-shadow:0 25px 90px #00000045}dialog::backdrop{background:#142a2859;backdrop-filter:blur(5px)}dialog h2{font-size:27px}#close-settings{font-size:22px;padding:3px 13px;background:transparent}#settings-status{font-size:11px;color:var(--muted);min-height:20px}#reset-settings{font-size:11px}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);padding:12px 22px;background:var(--text);color:var(--bg);box-shadow:0 7px 30px #0000002a;border-radius:12px;font-size:12px;z-index:100;max-width:calc(100vw - 32px);pointer-events:none}.card-tools{display:flex;flex-wrap:wrap;gap:7px;margin:18px 0 12px}.card-tools button{font-size:10px;padding:7px 11px;background:transparent}.card-editor{display:grid;gap:8px;margin-top:12px}.card-editor textarea{border:1px solid var(--line);border-radius:8px;padding:10px;font-size:13px;min-height:70px;margin:0}.card-editor button{justify-self:start;font-size:11px}.search-label{display:block;font-size:10px;color:var(--muted);max-width:360px;margin:17px 0}.search-label input{font-size:12px;margin-top:5px;background:var(--panel)}#generation-progress{padding:16px 3px 0}.progress-track{height:4px;border-radius:20px;background:var(--line);overflow:hidden}#progress-bar{height:100%;width:0;background:var(--accent);transition:width .5s ease;border-radius:20px}#progress-label{display:block;font-size:11px;color:var(--muted);margin-top:8px}#generation-progress:has(#progress-bar[style*="0%"]) .progress-track{animation:breathing 1.5s ease-in-out infinite}.composer:has(#send:disabled){border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-wash)}.note-page:has(input:checked){background:var(--accent-wash);padding:15px;border-radius:10px;border-color:transparent}.note-page{transition:background .2s,padding .2s}.flashcard[open]>:not(summary),.saved-notes[open]>.note-page{animation:fade-in var(--motion-time) ease-out both}.flashcard summary{transition:color .2s}.flashcard summary:hover{color:var(--accent)}button:active:not(:disabled){transform:scale(.98)}.nav{transition:background .2s,transform .2s}.nav:hover{transform:translateX(2px)}.composer,.response,.saved-notes{transition:border-color .2s,box-shadow .2s}.composer:focus-within{border-color:var(--accent);box-shadow:0 8px 35px #00000012,0 0 0 3px var(--accent-wash)}main>header,main>.topline{animation:rise-in 450ms ease-out both}.modes{animation:rise-in 450ms 70ms ease-out both}.composer{animation:rise-in 450ms 120ms ease-out both}.welcome-card{animation:fade-in 450ms 180ms ease-out both}.library{animation:fade-in 450ms 240ms ease-out both}#lecture-list>button{animation:rise-in 300ms ease-out both}#lecture-list>button:nth-child(2){animation-delay:35ms}#lecture-list>button:nth-child(3){animation-delay:70ms}#lecture-list>button:hover{box-shadow:0 6px 22px #203b3012;border-color:var(--accent);transform:translateY(-3px)}:root[data-accent=blue]{--accent:#1d4ed8;--accent-wash:#eff4ff}:root[data-accent=violet]{--accent:#6d28d9;--accent-wash:#f4f0ff}:root[data-accent=blue] h1 em{color:var(--accent)}:root[data-accent=violet] h1 em{color:var(--accent)}:root .primary{background:var(--accent);border-color:var(--accent)}:root .modes [aria-pressed=true],:root #selection-chips button,:root .section-heading>button{color:var(--accent);background:var(--accent-wash)}:root[data-accent=blue] .sidebar{background:#203e51}:root[data-accent=violet] .sidebar{background:#39314f}:root .nav.active{background:var(--accent-wash);color:var(--accent)}:root[data-size=small]{--reading-scale:.92}:root[data-size=large]{--reading-scale:1.16}.answer,.flashcard p,.note-page p{font-size:calc(14px * var(--reading-scale))}.flashcard summary{font-size:calc(13px * var(--reading-scale))}.composer textarea{font-size:calc(15px * var(--reading-scale))}:root[data-density=compact] main{padding-top:26px}:root[data-density=compact] .composer,:root[data-density=compact] .response{padding:18px}:root[data-density=compact] .flashcard{padding:12px 15px;margin:7px 0}:root[data-density=compact] #lecture-list>button{min-height:62px;padding-top:13px;padding-bottom:13px}:root[data-density=compact] .library{margin-top:25px}:root[data-density=compact] .topline{margin-bottom:22px}:root[data-motion=subtle]{--motion-time:160ms}:root[data-motion=subtle] *{transition-duration:120ms!important;animation-name:fade-in!important;animation-duration:160ms!important;animation-delay:0ms!important}:root[data-motion=subtle] button:hover{transform:none}:root[data-motion=off] *{animation:none!important;transition:none!important;scroll-behavior:auto!important}:root[data-motion=off]{scroll-behavior:auto}:root[data-motion=off] button:hover{transform:none}
:root:is([data-theme=dark],[data-theme=midnight]){color-scheme:dark;--bg:#171717;--panel:#222222;--line:#3d3d3d;--text:#f5f5f5;--muted:#b0b0b0;--accent:#ededed;--accent-wash:#303030;--shadow:0 8px 36px #00000026}:root:is([data-theme=dark],[data-theme=midnight])[data-accent=blue]{--accent:#8ab4ff;--accent-wash:#24334d}:root:is([data-theme=dark],[data-theme=midnight])[data-accent=violet]{--accent:#bca0ff;--accent-wash:#34294b}:root:is([data-theme=dark],[data-theme=midnight]) .composer,:root:is([data-theme=dark],[data-theme=midnight]) .response,:root:is([data-theme=dark],[data-theme=midnight]) .saved-notes,:root:is([data-theme=dark],[data-theme=midnight]) .flashcard,:root:is([data-theme=dark],[data-theme=midnight]) #notes-form,:root:is([data-theme=dark],[data-theme=midnight]) .auth-shell{background:var(--panel);border-color:var(--line)}:root:is([data-theme=dark],[data-theme=midnight]) input,:root:is([data-theme=dark],[data-theme=midnight]) select,:root:is([data-theme=dark],[data-theme=midnight]) #notes-text{background:var(--bg);color:var(--text);border-color:var(--line)}:root:is([data-theme=dark],[data-theme=midnight]) .modes{background:var(--bg);border-color:var(--line)}:root:is([data-theme=dark],[data-theme=midnight]) .modes [aria-pressed=true]{background:var(--accent-wash);color:var(--accent);border-color:var(--line)}:root:is([data-theme=dark],[data-theme=midnight]) #selected-notes{background:var(--bg);border-color:var(--line)}:root:is([data-theme=dark],[data-theme=midnight]) #selected-notes strong,:root:is([data-theme=dark],[data-theme=midnight]) .eyebrow,:root:is([data-theme=dark],[data-theme=midnight]) .question{color:var(--accent)}:root:is([data-theme=dark],[data-theme=midnight]) .flashcard[open],:root:is([data-theme=dark],[data-theme=midnight]) .welcome-star,:root:is([data-theme=dark],[data-theme=midnight]) .session-badge,:root:is([data-theme=dark],[data-theme=midnight]) .section-heading>button,:root:is([data-theme=dark],[data-theme=midnight]) #selection-chips button{background:var(--accent-wash);color:var(--accent);border-color:var(--line)}:root:is([data-theme=dark],[data-theme=midnight]) .primary{background:var(--accent);border-color:var(--accent);color:#171717}:root:is([data-theme=dark],[data-theme=midnight]) h1 em{color:var(--accent)}:root:is([data-theme=dark],[data-theme=midnight]) .saved-notes p{color:var(--muted)}:root:is([data-theme=dark],[data-theme=midnight]) .correct{background:#304b33;color:#d4e9ca}:root:is([data-theme=dark],[data-theme=midnight]) .wrong{background:#503832;color:#f3d5c7}:root:is([data-theme=dark],[data-theme=midnight]) .auth-shell .brand{color:var(--accent)}
@keyframes fade-in{from{opacity:0}to{opacity:1}}@keyframes rise-in{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}@keyframes breathing{50%{opacity:.4}}@media(max-width:760px){.top-actions .session-badge{display:none}.study-controls{gap:8px}.study-controls label{min-width:90px}.settings-grid{gap:14px}dialog{padding:22px}.topline{gap:8px}.topline>span{font-size:10px}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}html{scroll-behavior:auto}button:hover{transform:none!important}}

/* Midnight: decorative stars stay behind all interactive content. */
body{isolation:isolate}.app{position:relative;z-index:1}.starfield{display:none;position:fixed;inset:-8%;z-index:0;overflow:hidden;pointer-events:none;user-select:none}.star-layer{position:absolute;inset:0;will-change:transform}.star-layer i{position:absolute;left:var(--x);top:var(--y);width:var(--s);height:var(--s);background:#d6e0ff;border-radius:50%;opacity:var(--a);box-shadow:0 0 6px #bacdff40}.star-layer.nearby i{background:#e8dfff;box-shadow:0 0 9px #a595f770}.star-layer.distant{animation:star-drift 110s linear infinite alternate}.star-layer.nearby{animation:star-drift-near 80s linear infinite alternate}:root[data-theme=midnight]{--bg:#090e20;--panel:#121a32;--line:#2a3453;--text:#e4e9fa;--muted:#a2acca;--accent:#bdc8ff;--accent-wash:#242e50;--shadow:0 12px 45px #02061838;background:var(--bg)}:root[data-theme=midnight] body{background:radial-gradient(ellipse at 85% 5%,#33326135,transparent 50%),radial-gradient(ellipse at 25% 85%,#162d5235,transparent 55%),var(--bg)}:root[data-theme=midnight] .starfield{display:block}:root[data-theme=midnight] .sidebar{background:#0d142bea;border-color:#29304d}:root[data-theme=midnight] .brand{color:#e0dcff}:root[data-theme=midnight] .sidebar .tagline,:root[data-theme=midnight] .sidebar .nav,:root[data-theme=midnight] .sidebar p{color:#a6b1d3}:root[data-theme=midnight] .sidebar .nav.active{color:#dfe4ff;background:#2b3557}:root[data-theme=midnight] .sidebar .nav:not(.active):hover{background:#1d2947}:root[data-theme=midnight] .source-panel,:root[data-theme=midnight] .sidebar-bottom{border-color:#2a3453}:root[data-theme=midnight] .source-panel select{background:#151f3c;border-color:#374568;color:#dfe6fa}:root[data-theme=midnight] .source-panel label,:root[data-theme=midnight] .source-panel a,:root[data-theme=midnight] .sidebar .quiet{color:#bfc7ea}:root[data-theme=midnight] .composer,:root[data-theme=midnight] .response,:root[data-theme=midnight] .saved-notes,:root[data-theme=midnight] #notes-form{background:#121a32f5}:root[data-theme=midnight][data-accent=blue]{--accent:#a7d7f8;--accent-wash:#20354c}:root[data-theme=midnight][data-accent=violet]{--accent:#d1bcfa;--accent-wash:#30274e}:root[data-theme=midnight] .primary{color:#10182c}:root[data-stars=off] .starfield{display:none}:root[data-stars=still] .starfield *,:root[data-motion=off] .starfield *,:root[data-motion=subtle] .starfield *{animation:none!important;will-change:auto}:root[data-stars=off] .starfield *{animation:none!important;will-change:auto}
@keyframes star-drift{from{transform:translate(0,0)}to{transform:translate(2.5%,-3%)}}@keyframes star-drift-near{from{transform:translate(0,0)}to{transform:translate(-3%,4%)}}@keyframes star-glimmer{0%,100%{opacity:var(--a)}50%{opacity:.15}}@media(prefers-reduced-motion:reduce){.starfield *{animation:none!important;will-change:auto}}

/* Seamless parallax: matching halves wrap without a visible jump. */
.starfield{inset:0}.star-layer{height:200%;inset:0 0 auto;backface-visibility:hidden;transform:translate3d(0,0,0)}.star-layer.distant{animation:sky-flow 140s linear infinite}.star-layer.nearby{animation:sky-flow 90s linear infinite}.shooting-stars{position:absolute;inset:0;overflow:hidden;--meteor-cycle:23s}.meteor{position:absolute;width:130px;height:1px;opacity:0;border-radius:100%;background:linear-gradient(90deg,transparent,#bbcaffaa 70%,#f1f5ff);filter:drop-shadow(0 0 4px #adc4ff);transform-origin:right center;animation:meteor-flight var(--meteor-cycle) linear infinite;will-change:transform,opacity}.meteor:after{content:'';position:absolute;right:-1px;top:-1px;width:3px;height:3px;background:#f3f5ff;border-radius:50%;box-shadow:0 0 9px 2px #adbeff70}.meteor-one{left:24%;top:4%;animation-delay:-.2s}.meteor-two{left:52%;top:12%;animation-delay:-12s;animation-duration:calc(var(--meteor-cycle)*1.31);width:95px}.meteor-three{left:10%;top:25%;animation-delay:-26s;animation-duration:calc(var(--meteor-cycle)*1.73);width:150px}:root[data-shooting=rare] .shooting-stars{--meteor-cycle:48s}:root[data-shooting=frequent] .shooting-stars{--meteor-cycle:12s}:root[data-shooting=off] .shooting-stars,:root[data-stars=still] .shooting-stars,:root[data-stars=off] .shooting-stars,:root[data-motion=subtle] .shooting-stars,:root[data-motion=off] .shooting-stars{display:none}:root[data-shooting=off] .meteor{animation:none;will-change:auto}.starfield:has(.meteor){contain:strict}@keyframes sky-flow{from{transform:translate3d(0,0,0)}to{transform:translate3d(0,-50%,0)}}@keyframes meteor-flight{0%{opacity:0;transform:translate3d(-10vw,-5.8vw,0) rotate(30deg) scaleX(.6)}1%{opacity:.9}7%{opacity:0;transform:translate3d(48vw,27.8vw,0) rotate(30deg) scaleX(1)}100%{opacity:0;transform:translate3d(48vw,27.8vw,0) rotate(30deg) scaleX(1)}}@media(prefers-reduced-motion:reduce){.shooting-stars{display:none}.starfield *{animation:none!important;will-change:auto}}

.star-layer.nearby i{animation:star-glimmer 7s var(--delay) ease-in-out infinite}

/* A neutral, near-black sky with restrained starlight. */
:root[data-theme=midnight]{--bg:#050607;--panel:#111214;--line:#2c2e33;--text:#ececf0;--muted:#aaaab3;--accent:#e5e5e5;--accent-wash:#27272a;--shadow:0 12px 45px #00000045;background:var(--bg)}:root[data-theme=midnight] body{background:radial-gradient(ellipse at 85% 5%,#ffffff04,transparent 50%),var(--bg)}:root[data-theme=midnight] .sidebar{background:#090a0cf5;border-color:#292a2f}:root[data-theme=midnight] .brand{color:#efedf4}:root[data-theme=midnight] .sidebar .tagline,:root[data-theme=midnight] .sidebar .nav,:root[data-theme=midnight] .sidebar p{color:#aeafb8}:root[data-theme=midnight] .sidebar .nav.active{color:#eeedf5;background:#292a30}:root[data-theme=midnight] .sidebar .nav:not(.active):hover{background:#1c1d21}:root[data-theme=midnight] .source-panel,:root[data-theme=midnight] .sidebar-bottom{border-color:#2b2c31}:root[data-theme=midnight] .source-panel select{background:#151619;border-color:#36373e;color:#e5e5ec}:root[data-theme=midnight] .source-panel label,:root[data-theme=midnight] .source-panel a,:root[data-theme=midnight] .sidebar .quiet{color:#c3c3cf}:root[data-theme=midnight] .composer,:root[data-theme=midnight] .response,:root[data-theme=midnight] .saved-notes,:root[data-theme=midnight] #notes-form{background:#111214f7}:root[data-theme=midnight][data-accent=blue]{--accent:#8ab4ff;--accent-wash:#1d293d}:root[data-theme=midnight][data-accent=violet]{--accent:#bca0ff;--accent-wash:#2b223e}:root[data-theme=midnight] .primary{color:#111214}:root[data-theme=midnight] .star-layer i{background:#e5e5ed;box-shadow:0 0 6px #ffffff25}:root[data-theme=midnight] .star-layer.nearby i{background:#f1eef7;box-shadow:0 0 8px #e2d9ff35}:root[data-theme=midnight] .meteor{background:linear-gradient(90deg,transparent,#dadce5aa 70%,#fff);filter:drop-shadow(0 0 4px #dadce580)}:root[data-theme=midnight] .meteor:after{background:#fff;box-shadow:0 0 9px 2px #e0dbff50}

/* Library navigation and organization */
.sidebar .nav[aria-current=page]{box-shadow:inset 3px 0 0 var(--accent),0 3px 10px #00000012}.sidebar .nav{min-height:44px}.library-filters{display:flex;gap:12px;align-items:end;flex-wrap:wrap}.library-filters label{font-size:11px;color:var(--muted);flex:1;min-width:130px}.library-filters select{margin-top:5px;font-size:12px}.library-filters>button{font-size:11px;white-space:nowrap;margin-bottom:1px}#organize-bar{border:1px solid var(--line);border-radius:15px;padding:18px 20px;background:var(--panel);margin-bottom:24px}#organize-bar .search-label{max-width:100%;margin-bottom:10px}#storage-summary{font-size:11px;margin-bottom:0}.collection-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:22px 0}.library-entry{min-height:80px;text-align:left;font-size:12px;overflow-wrap:anywhere;padding:18px 20px;position:relative}.library-entry:hover{border-color:var(--accent)}.metadata-form,.quiz-save-form{display:flex;gap:9px;align-items:center;flex-wrap:wrap;margin:15px 0}.metadata-form input,.quiz-save-form input{flex:2;min-width:170px}.metadata-form select,.quiz-save-form select{flex:1;min-width:130px}.metadata-form button,.quiz-save-form button{font-size:11px;white-space:nowrap}.danger{color:#a04443;border-color:#c38b8b;background:transparent}.danger:hover:not(:disabled){color:#8d2525;border-color:#a04443;background:#a0444310}:root:is([data-theme=dark],[data-theme=midnight]) .danger{color:#f2b7b2;border-color:#7d5453}.empty-library{grid-column:1/-1}#new-subject-form{display:flex;gap:9px;align-items:end;flex-wrap:wrap;margin:16px 0}#new-subject-form label{flex:1;min-width:150px;font-size:11px}#new-subject-form input{margin-top:5px}#new-subject-form button{font-size:11px}#lecture-reader>.primary{margin-top:20px}#cards-view,#quizzes-view,#library{margin-top:15px}#card-reader,#quiz-reader{scroll-margin-top:25px}#delete-description{font-size:14px;white-space:pre-wrap;overflow-wrap:anywhere}.nav[aria-current=page]{font-weight:700}@media(max-width:760px){.sidebar nav{display:grid;grid-template-columns:1fr 1fr;gap:6px}.sidebar .nav{font-size:11px;padding:10px}.collection-grid{grid-template-columns:1fr}.library-filters{gap:9px}#organize-bar{padding:15px}.metadata-form input,.metadata-form select,.quiz-save-form input{min-width:100%;flex-basis:100%}}
.review-actions{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0}.review-actions button{font-size:10px;padding:8px 11px}

.brand-mark{display:block;width:34px;height:34px;flex:0 0 auto}.auth-shell .brand-mark{width:30px;height:30px}
#prepared-notes-list{margin-top:10px;border-top:1px solid var(--line);padding-top:8px}#prepared-notes-list>p{font-size:10px;line-height:1.45}.prepared-note-entry{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:7px 0;border-top:1px solid var(--line);font-size:10px}.prepared-note-actions{display:flex;flex-wrap:wrap;gap:4px}.prepared-note-actions button{padding:4px 7px;font-size:9px}

/* Comfortable reading and compact, opt-in references. */
body{font-size:16px;line-height:1.65}
main{max-width:1200px;padding-inline:clamp(24px,4vw,56px)}
.sidebar{overflow-y:auto}
.tagline,.source-panel label,.sidebar-bottom p,.sidebar .quiet,.eyebrow,.session-badge,footer{font-size:13px}
.nav,.sidebar .nav{font-size:15px}
.source-panel select,.source-panel p,.source-panel a,.sidebar-bottom,.topline,.intro,.hint,.compose-footer .hint,.compose-footer label,.quiet,.status,.explanation,.suggestions button,.welcome-card p{font-size:14px}
.modes button,.primary,.composer>label,.section-heading>button,.library>.hint,.settings-grid label,.settings-grid select,.settings-grid input{font-size:15px}
#open-settings,.study-controls label,.study-controls select,.library-filters label,.library-filters select,.library-filters>button,#new-subject-form label,#new-subject-form button,#storage-summary,#settings-status,#reset-settings,#draft-status,#library-status{font-size:14px}
.study-controls{gap:16px;margin-bottom:20px}.study-controls select{padding:10px 12px}.modes{gap:8px;margin-bottom:22px}.modes button{padding:12px 10px}
.composer{padding:28px}.composer textarea{font-size:calc(17px * var(--reading-scale));min-height:120px}.compose-footer{row-gap:14px}
#selected-notes{padding:14px 16px;font-size:14px;background:var(--bg);border-style:solid}
#selected-notes strong,#selected-notes a{font-size:13px}#selected-notes p{font-size:14px;line-height:1.5;margin:6px 0 10px}
#selection-chips button{font-size:13px;line-height:1.5;padding:6px 10px;max-width:100%}
.welcome-card h2{font-size:19px}.welcome-card p{line-height:1.6}.welcome-card{padding-block:28px}
h2{font-weight:650}h3{font-size:20px;letter-spacing:-.3px;line-height:1.4}
.response{padding:28px;margin:24px 0;border-radius:16px}.question{font-size:15px;line-height:1.5;padding-bottom:16px;border-bottom:1px solid var(--line);margin-bottom:20px;color:var(--accent)}
.answer,.flashcard p,.note-page p{font-size:calc(17px * var(--reading-scale));line-height:1.8}
.answer{white-space:normal;max-width:75ch}.answer p{white-space:pre-wrap;margin:0 0 16px}.answer p:last-child{margin-bottom:0}.answer h3{font-size:1.15em;margin:24px 0 12px}.answer h3:first-child{margin-top:0}.answer ul,.answer ol{padding-left:26px;margin:14px 0 20px}.answer li{padding-left:4px;margin:8px 0}.answer code{font: .9em/1.6 ui-monospace,monospace;background:var(--accent-wash);border-radius:5px;padding:2px 5px;overflow-wrap:anywhere}
.flashcard summary{font-size:calc(16px * var(--reading-scale));line-height:1.6}.flashcard{padding:18px 20px;margin:12px 0}.flashcard small{font-size:13px}.flashcard p{margin:16px 0}.options button{font-size:16px;padding:13px 16px;line-height:1.6}.quiz-item{padding:26px 0}.response h2{font-size:20px;line-height:1.5}
.references{margin:14px 0 0;color:var(--muted);font-size:14px;border:0;clear:both}.references>summary{display:list-item;cursor:pointer;width:fit-content;max-width:100%;padding:4px 0;line-height:1.5;font-weight:500}.references>summary:hover{color:var(--accent)}.references>summary:focus-visible,.saved-notes>summary:focus-visible,.page-preview>summary:focus-visible{outline:2px solid var(--accent);outline-offset:4px;border-radius:3px}
.reference-list{border:1px solid var(--line);border-radius:10px;background:var(--bg);margin-top:10px;padding:4px 16px;max-height:320px;overflow:auto;overscroll-behavior:contain}.source{padding:14px 0;border:0}.source+.source{border-top:1px solid var(--line)}.source h4{font-size:14px;line-height:1.5;margin:0 0 8px;color:var(--text)}.source p{font-size:14px;line-height:1.7;margin:0;max-height:none;overflow:visible;white-space:pre-wrap;overflow-wrap:anywhere}
#lecture-list>button,.library-entry{font-size:15px;line-height:1.6}.library-entry{border-radius:12px}#lecture-reader h3{margin-top:28px}.metadata-form button,.quiz-save-form button,.card-tools button,.review-actions button,#lecture-reader>button{font-size:14px}.card-tools{gap:8px;margin:18px 0}.card-tools button,.review-actions button{padding:8px 12px}
.saved-notes{padding:16px 20px;background:var(--panel)}.saved-notes>summary{font-size:16px;line-height:1.6}.saved-notes>button{font-size:14px}.note-page{padding-top:14px;margin-top:14px}.note-page label{font-size:15px;line-height:1.5}.note-page input{width:18px;height:18px;flex:0 0 auto}.page-preview{margin:8px 0 0 28px}.page-preview>summary{font-size:14px;color:var(--muted);cursor:pointer;width:fit-content;padding:4px 0}.page-preview p{max-height:360px;overflow:auto;overscroll-behavior:contain;margin:12px 0}
#notes-form label,#notes-text,input[type=file]{font-size:15px}.search-label,.search-label input{font-size:15px}
#prepared-notes-list>p,.prepared-note-entry,.prepared-note-actions button{font-size:13px}.prepared-note-entry{gap:12px;flex-wrap:wrap}.prepared-note-actions button{padding:6px 9px}
:root[data-density=compact] .composer,:root[data-density=compact] .response{padding:22px}
@media(max-width:1050px){.app{grid-template-columns:240px minmax(0,1fr)}main{padding-inline:24px}.modes{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:760px){.app{display:block}main{padding:24px 16px}.sidebar{padding:20px}.sidebar .nav{font-size:14px}.topline{align-items:flex-start;flex-wrap:wrap;gap:12px}.top-actions{gap:8px;flex-wrap:wrap}.session-badge{font-size:13px}.modes{grid-template-columns:repeat(2,minmax(0,1fr))}.modes button{font-size:14px;padding:12px 8px}.composer,.response{padding:20px}.study-controls{gap:12px}.intro{font-size:15px}.section-heading{align-items:flex-start;flex-wrap:wrap}.saved-notes{padding:16px}.metadata-form button{width:100%}.reference-list{padding-inline:12px}.answer,.flashcard p,.note-page p{font-size:calc(16px * var(--reading-scale))}.compose-footer .primary{margin-left:0;flex:1;min-width:160px}.prepared-note-actions{gap:8px}footer{font-size:13px;flex-wrap:wrap}}
#selected-notes>summary{font-size:14px;font-weight:600;cursor:pointer;color:var(--text);line-height:1.6;width:fit-content;padding:2px 0}#selected-notes[open]>summary{margin-bottom:12px}#selected-notes>summary:focus-visible,.source-panel>summary:focus-visible{outline:2px solid var(--accent);outline-offset:4px;border-radius:3px}.source-panel>summary{font-size:14px;font-weight:600;cursor:pointer;color:#d9eac8;line-height:1.5;padding:4px 0}:root:is([data-theme=dark],[data-theme=midnight]) .source-panel>summary{color:var(--text)}

/* All workspace tabs share one shell and the same appearance tokens. */
:root[data-view] [data-panel]{display:none!important}
:root[data-view=study] [data-panel=study],:root[data-view=notes] [data-panel=notes],:root[data-view=cards] [data-panel=cards],:root[data-view=quizzes] [data-panel=quizzes],:root[data-view=plans] [data-panel=plans]{display:block!important}
#plans-view{--plans-reading:calc(16px * var(--reading-scale));font-size:var(--plans-reading)}
#plans-view .plans-header{max-width:740px;margin-bottom:36px}#plans-view h1{font-size:clamp(36px,4vw,52px);letter-spacing:-1.8px;margin-bottom:20px}#plans-view .plans-header>p{color:var(--muted);margin-bottom:22px}
#plans-view .button{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:44px;border-radius:10px;padding:10px 16px;text-decoration:none;font-size:15px;font-weight:600;line-height:1.5;border:1px solid var(--line)}
#plans-view .button-primary{background:var(--accent);color:var(--panel);border-color:var(--accent)}:root:is([data-theme=dark],[data-theme=midnight]) #plans-view .button-primary{color:var(--bg)}
#plans-view .button-secondary{background:var(--panel);color:var(--accent)}#plans-view .button:hover{filter:brightness(.95)}
#plans-view .trust-note,#plans-view .plan-disclaimer{color:var(--muted);font-size:14px;margin-top:14px}
#plans-view .section-intro{margin-bottom:22px}#plans-view h2{font-size:28px;letter-spacing:-.7px;margin:8px 0 12px}#plans-view .section-intro>p{color:var(--muted);margin-top:0}
#plans-view .plan-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}#plans-view .plan-card{display:flex;flex-direction:column;padding:24px;background:var(--panel);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow)}
#plans-view .plan-card.available{border-color:var(--accent)}#plans-view .plan-top{display:flex;justify-content:space-between;gap:8px;color:var(--accent)}#plans-view .plan-kicker{font-size:12px;letter-spacing:1px;font-weight:700}#plans-view h3{font-size:23px;line-height:1.4;margin:18px 0 10px}
#plans-view .plan-summary{font-size:15px;line-height:1.65;color:var(--muted);margin:0;min-height:5em}#plans-view .price{display:flex;gap:8px;align-items:baseline;min-height:44px;margin:20px 0}#plans-view .price strong{font-size:30px;line-height:1.4}#plans-view .price span{font-size:14px;color:var(--muted)}#plans-view .planned-price strong{font-size:22px}
#plans-view .feature-list{padding:0;margin:24px 0 0;list-style:none;display:grid;gap:12px;font-size:15px}#plans-view .feature-list li{padding-left:22px;position:relative}#plans-view .feature-list li:before{content:'✓';position:absolute;left:0;color:var(--accent)}#plans-view .planned .feature-list li:before{content:'·'}
#plans-view .upcoming-section{display:grid;grid-template-columns:1fr 1fr;gap:32px;padding:28px;margin:36px 0;background:var(--accent-wash);border:1px solid var(--line);border-radius:16px;scroll-margin-top:24px}#plans-view .upcoming-copy>p{color:var(--muted);font-size:15px}#plans-view .upcoming-points{display:grid;gap:16px}#plans-view .upcoming-points>div{display:flex;gap:16px;padding-bottom:16px;border-bottom:1px solid var(--line)}#plans-view .upcoming-points>div:last-child{border:0;padding-bottom:0}#plans-view .upcoming-points>div>span{font-size:13px;color:var(--accent);padding-top:3px}#plans-view .upcoming-points p{margin:0;font-size:15px;color:var(--muted)}#plans-view .upcoming-points strong{color:var(--text)}
#plans-view .faq-section{margin:36px 0}#plans-view .faq-list{border-top:1px solid var(--line)}#plans-view .faq-list details{padding:16px 0;border-bottom:1px solid var(--line)}#plans-view .faq-list summary{font-weight:600;cursor:pointer}#plans-view .faq-list p{color:var(--muted);line-height:1.7;margin:12px 0 0}
#plans-view .closing-cta{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:24px 0;border-top:1px solid var(--line)}#plans-view .closing-cta h2{font-size:25px;margin-bottom:0}
@media(max-width:1100px){#plans-view .plan-grid{grid-template-columns:1fr}#plans-view .plan-summary{min-height:0}#plans-view .plan-card{padding:24px}#plans-view .upcoming-section{grid-template-columns:1fr}}
@media(max-width:760px){#plans-view .plans-header{margin-bottom:28px}#plans-view .upcoming-section{padding:20px}#plans-view .closing-cta{align-items:flex-start;flex-direction:column}#plans-view h2{font-size:25px}}
:root[data-view=study] .sidebar .nav[data-view=study],:root[data-view=notes] .sidebar .nav[data-view=notes],:root[data-view=cards] .sidebar .nav[data-view=cards],:root[data-view=quizzes] .sidebar .nav[data-view=quizzes],:root[data-view=plans] .sidebar .nav[data-view=plans]{background:var(--accent-wash);color:var(--accent);font-weight:650;box-shadow:inset 3px 0 0 var(--accent),0 3px 10px #00000012}

.auth-shell .auth-consent{display:flex;align-items:flex-start;gap:10px;font-weight:400;line-height:1.65}.auth-shell .auth-consent input{width:18px;height:18px;flex:0 0 18px;margin:2px 0 0;accent-color:var(--accent)}#openai-consent-details{margin:10px 0 0 28px}

/* Math uses bundled KaTeX fonts and inherits the current theme. */
.katex{font-size:1.1em;white-space:normal}.math-inline{display:inline;overflow:visible;vertical-align:baseline;white-space:normal;padding:0}.katex-display{max-width:100%;overflow-x:auto;overflow-y:hidden;padding:6px 0;white-space:normal}.katex-display>.katex{white-space:nowrap}.katex-error{color:inherit!important;white-space:pre-wrap;overflow-wrap:anywhere}

.math-fallback{font-family:ui-monospace,monospace;font-size:.92em;white-space:pre-wrap;overflow-wrap:anywhere;color:var(--text)}.answer pre{white-space:pre;max-width:100%;overflow-x:auto;padding:12px;background:var(--soft);border-radius:8px}.answer .katex-display{margin:.7em 0}

/* Ordinary symbols keep their normal weight inside headings and card summaries.
   Explicit LaTeX vector/tensor commands retain their mathematical meaning. */
.math-inline>.katex,.katex-display>.katex{font-weight:400;font-synthesis:none}

/* Plain white replaces the warm light canvas; retain the chosen accent. */
:root:not([data-theme=dark]):not([data-theme=midnight]) :is(input,select,#notes-text,#selected-notes){background:#fff;border-color:var(--line)}
:root:not([data-theme=dark]):not([data-theme=midnight]) .sidebar{background:#fff;color:var(--text);border-color:var(--line)}
:root:not([data-theme=dark]):not([data-theme=midnight]) .sidebar :is(.tagline,.nav,p,.quiet){color:var(--muted)}
:root:not([data-theme=dark]):not([data-theme=midnight]) .sidebar :is(.brand,.source-panel label,.source-panel a){color:var(--accent)}
:root:not([data-theme=dark]):not([data-theme=midnight]) :is(.source-panel,.sidebar-bottom){border-color:var(--line)}
:root:not([data-theme=dark]):not([data-theme=midnight]) .source-panel select{color:var(--text)}
:root:not([data-theme=dark]):not([data-theme=midnight]) .sidebar .nav.active{background:var(--accent-wash);color:var(--accent)}
:root:not([data-theme=dark]):not([data-theme=midnight]) .sidebar .nav:not(.active):hover{background:#f5f5f5}
:root:not([data-theme=dark]):not([data-theme=midnight]) .modes{background:#f5f5f5;border-color:var(--line)}

:root:not([data-theme=dark]):not([data-theme=midnight]) .sidebar-bottom{color:var(--text)}
:root:not([data-theme=dark]):not([data-theme=midnight]) .source-panel>summary{color:var(--accent)}

/* Saved flashcard sets and focused study layouts. */
.deck-list{display:grid;gap:10px;margin:24px 0}
.deck-row{display:grid;grid-template-columns:minmax(0,1fr) auto auto auto;gap:24px;align-items:center;text-align:left;padding:20px 24px;width:100%;background:var(--panel);border:1px solid var(--line);border-radius:14px}
.deck-title{display:grid;gap:3px;min-width:0}.deck-title strong{font-size:17px;font-weight:600;overflow-wrap:anywhere}.deck-title .hint{font-size:14px}
.deck-count,.deck-date{font-size:14px;color:var(--muted)}.deck-date{display:grid;gap:2px;min-width:130px}.deck-date-label{font-size:12px}.deck-open{font-size:14px;color:var(--accent);font-weight:600}
#card-reader h3{font-size:28px;margin:14px 0 8px;overflow-wrap:anywhere}
.study-deck-toolbar{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin:24px 0 16px}.study-deck-toolbar button,.deck-pagination button{font-size:14px}.deck-layouts{display:flex;gap:4px;padding:4px;border:1px solid var(--line);border-radius:12px;background:var(--bg)}.deck-layouts button{border-color:transparent;background:transparent;padding:9px 12px}.deck-layouts button[aria-pressed=true]{border-color:var(--line);background:var(--panel);color:var(--accent);font-weight:650}
.deck-pagination{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:16px 0}.deck-pagination p{margin:0;text-align:center}
.study-card-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:18px;align-items:start}.study-card-grid[data-layout="2"],.study-card-grid[data-layout="4"]{grid-template-columns:repeat(2,minmax(0,1fr))}
.study-card{min-width:0;padding:18px;border:1px solid var(--line);border-radius:18px;background:var(--panel);box-shadow:var(--shadow)}.study-card-source{margin:0 0 12px;font-size:13px;color:var(--muted)}
.study-card-flip{width:100%;min-height:260px;display:flex;flex-direction:column;align-items:stretch;justify-content:space-between;gap:18px;padding:24px;background:var(--bg);border:1px solid var(--line);text-align:center;perspective:700px}.study-card-flip:hover:not(:disabled){transform:none}.study-card[data-flipped=true] .study-card-flip{border-color:var(--accent)}
.study-card-side{font-size:12px;font-weight:700;letter-spacing:1.5px;color:var(--accent)}.study-card-content{display:block;white-space:pre-wrap;overflow-wrap:anywhere;font-size:calc(20px * var(--reading-scale));line-height:1.65}.study-card-hint{font-size:12px;color:var(--muted)}.study-card .review-actions{margin-bottom:0}.study-card .review-actions button{font-size:12px}
.study-card-grid[data-layout="1"] .study-card{max-width:760px;width:100%;justify-self:center}.study-card-grid[data-layout="1"] .study-card-flip{min-height:320px}
@media(max-width:760px){.deck-row{grid-template-columns:minmax(0,1fr) auto;gap:12px;padding:16px}.deck-count{grid-column:1}.deck-date{grid-column:2;grid-row:1 / 3;min-width:0;text-align:right}.deck-open{display:none}.study-deck-toolbar{gap:8px}.deck-layouts{width:100%}.deck-layouts button{flex:1;padding-inline:7px}.study-deck-toolbar>button{padding:9px 10px}.study-card-grid[data-layout="2"],.study-card-grid[data-layout="4"]{grid-template-columns:minmax(0,1fr)}.study-card-flip{min-height:230px;padding:18px}.deck-pagination button{padding:9px}.study-card{padding:14px}.study-card-grid[data-layout="1"] .study-card-flip{min-height:260px}}

.source-attribution{margin:12px 0;font-size:13px;line-height:1.6;color:var(--muted);overflow-wrap:anywhere}.source-attribution strong{font-weight:600}.source-attribution a,.answer a{color:var(--accent);text-decoration:underline;text-underline-offset:3px}.source small{display:block;color:var(--muted);margin-top:8px}.study-card .references{margin:10px 0}

.billing-toolbar{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-top:18px}.billing-toolbar p{flex-basis:100%;margin:0}.billing-toolbar button{font-size:14px}.plan-card button.button{width:100%;text-align:center}.plan-card button.button:disabled{cursor:default}

.auth-shell .auth-switch{display:block;width:100%;min-height:52px;margin-top:16px;padding:14px 16px;font-size:15px;font-weight:650;line-height:1.5;background:var(--accent-wash,var(--soft));border:2px solid var(--accent);color:var(--accent)}

#plans-view .plan-card.current-plan{border-color:var(--accent)}

.plan-dialog-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}.plan-dialog-actions button{min-height:44px}#plan-dialog .primary{background:var(--accent);border-color:var(--accent);color:var(--panel)}

/* Neutral Evening dark surfaces; accent color stays on interactive elements. */
:root[data-theme=dark] .sidebar{background:#111111;color:var(--text);border-color:var(--line)}
:root[data-theme=dark] .sidebar .brand{color:var(--text)}
:root[data-theme=dark] .sidebar :is(.tagline,.nav,p,.quiet,.sidebar-bottom){color:var(--muted)}
:root[data-theme=dark] .sidebar .nav.active{background:var(--accent-wash);color:var(--accent)}
:root[data-theme=dark] .sidebar .nav:not(.active):hover{background:#282828;color:var(--text)}
:root[data-theme=dark] :is(.source-panel,.sidebar-bottom){border-color:var(--line)}
:root[data-theme=dark] .source-panel select{background:var(--panel);border-color:var(--line);color:var(--text)}
:root[data-theme=dark] .source-panel :is(label,summary){color:var(--muted)}
:root[data-theme=dark] .source-panel a{color:var(--accent)}
:root .primary{background:var(--accent);border-color:var(--accent)}
:root .primary:hover:not(:disabled){background:var(--accent);border-color:var(--accent);filter:brightness(.94)}
:root:is([data-theme=dark],[data-theme=midnight]) .primary:hover:not(:disabled){color:#111111}
:root .welcome-star{background:var(--accent-wash);color:var(--accent);border-color:var(--line)}
:root .session-badge{background:var(--accent-wash);color:var(--accent)}
:root :is(.session-badge,.sidebar-bottom p):before{background:var(--accent)}
:root .flashcard[open]{background:var(--accent-wash);border-color:var(--line)}
:root .question{color:var(--accent)}
:root .saved-notes p{color:var(--muted)}
:root .eyebrow{color:var(--muted)}
:root #selected-notes strong{color:var(--muted)}
:root{accent-color:var(--accent)}
:root :is(input,textarea)::placeholder{color:var(--muted)}
:root footer{color:var(--muted)}
:root input[type=file]::file-selector-button{background:var(--accent-wash);color:var(--accent)}
dialog::backdrop{background:#00000080;backdrop-filter:none}

:root:not([data-theme=midnight]) [data-midnight-only]{display:none}