@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/_astro/inter-cyrillic-ext-wght-normal.BOeWTOD4.woff2)format("woff2-variations");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/_astro/inter-cyrillic-wght-normal.DqGufNeO.woff2)format("woff2-variations");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/_astro/inter-greek-ext-wght-normal.DlzME5K_.woff2)format("woff2-variations");unicode-range:U+1F??}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/_astro/inter-greek-wght-normal.CkhJZR-_.woff2)format("woff2-variations");unicode-range:U+370-377,U+37A-37F,U+384-38A,U+38C,U+38E-3A1,U+3A3-3FF}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/_astro/inter-vietnamese-wght-normal.CBcvBZtf.woff2)format("woff2-variations");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/_astro/inter-latin-ext-wght-normal.DO1Apj_S.woff2)format("woff2-variations");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:Inter Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/_astro/inter-latin-wght-normal.Dx4kXJAl.woff2)format("woff2-variations");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:Fraunces Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/_astro/fraunces-vietnamese-wght-normal.CnvboYUG.woff2)format("woff2-variations");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:Fraunces Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/_astro/fraunces-latin-ext-wght-normal.Ca2vKHc0.woff2)format("woff2-variations");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:Fraunces Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/_astro/fraunces-latin-wght-normal.ukD16Tqj.woff2)format("woff2-variations");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}:root{--bg:#f7f4ee;--card:#fff;--border:#e4ddd1;--text:#1f1d1a;--muted:#57524a;--accent:#245a4b;--accent-text:#fff;--tint:#e8f1ed;--tint-border:#245a4b;--ok:#1d6b3a;--ok-bg:#e6f3ea;--bad:#a3312a;--bad-bg:#fbeceb;--warn:#8a5300;--warn-bg:#fff4dc;--shadow:0 1px 2px #281e0a0d, 0 2px 8px #281e0a0a;--radius:14px;--serif:"Fraunces Variable", Georgia, "Times New Roman", serif;--sans:"Inter Variable", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;color-scheme:light}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#181715;--card:#22201d;--border:#3a3631;--text:#f1ede6;--muted:#bbb4a8;--accent:#84c9b2;--accent-text:#10201b;--tint:#1f302a;--tint-border:#84c9b2;--ok:#7dd49a;--ok-bg:#1a2e21;--bad:#f19a92;--bad-bg:#351e1c;--warn:#f2c46b;--warn-bg:#332810;--shadow:none;color-scheme:dark}}:root[data-theme=dark]{--bg:#181715;--card:#22201d;--border:#3a3631;--text:#f1ede6;--muted:#bbb4a8;--accent:#84c9b2;--accent-text:#10201b;--tint:#1f302a;--tint-border:#84c9b2;--ok:#7dd49a;--ok-bg:#1a2e21;--bad:#f19a92;--bad-bg:#351e1c;--warn:#f2c46b;--warn-bg:#332810;--shadow:none;color-scheme:dark}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{background:var(--bg);color:var(--text);font-family:var(--sans);margin:0;font-size:1rem;line-height:1.55}h1,h2,h3{font-family:var(--serif);letter-spacing:-.01em;margin:0 0 .5rem;font-weight:600;line-height:1.2}h1{font-size:clamp(1.75rem,5vw,2.5rem)}h2{font-size:1.35rem}h3{font-size:1.1rem}p{margin:0 0 1rem}a{color:var(--accent);text-underline-offset:2px}img,svg{max-width:100%;height:auto}:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:4px}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}.wrap{max-width:1040px;margin:0 auto;padding:0 16px}.muted{color:var(--muted)}.small{font-size:.875rem}.sr-only{clip:rect(0 0 0 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.skip{position:absolute;left:-9999px}.skip:focus{z-index:100;background:var(--card);padding:8px 12px;top:8px;left:16px}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px}.stack>*+*{margin-top:16px}.grid{gap:16px;display:grid}@media (width>=720px){.grid-2{grid-template-columns:1fr 1fr}.grid-3{grid-template-columns:repeat(3,1fr)}}.pill{background:var(--tint);color:var(--accent);border:1px solid #0000;border-radius:999px;padding:2px 10px;font-size:.75rem;font-weight:600;display:inline-block}.btn{border:1px solid var(--border);background:var(--card);min-height:44px;color:var(--text);font:inherit;cursor:pointer;border-radius:10px;justify-content:center;align-items:center;gap:8px;padding:10px 18px;font-weight:600;text-decoration:none;display:inline-flex}.btn:hover{border-color:var(--muted)}.btn-primary{background:var(--accent);color:var(--accent-text);border-color:var(--accent)}.btn-primary:hover{filter:brightness(1.08);border-color:var(--accent)}.btn[disabled]{opacity:.5;cursor:not-allowed}.btn-block{width:100%}.btn-ghost{background:0 0;border-color:#0000}.site-header{border-bottom:1px solid var(--border)}.site-header .wrap{justify-content:space-between;align-items:center;min-height:56px;display:flex}.brand{font-family:var(--serif);color:var(--text);align-items:center;gap:8px;font-size:1.15rem;font-weight:600;text-decoration:none;display:inline-flex}.brand-mark{width:24px;height:24px;color:var(--accent);flex:none}.footer-trees{margin-top:48px}.site-footer{border-top:1px solid var(--border);padding:24px 0 96px}main{padding:24px 0}.player{max-width:760px;margin:0 auto;padding-bottom:96px}.player-bar{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;margin-bottom:12px;display:flex}.timer{font-variant-numeric:tabular-nums;border:1px solid var(--border);background:var(--card);border-radius:999px;padding:4px 12px;font-weight:700}.timer-low{color:var(--warn);background:var(--warn-bg);border-color:var(--warn)}.time-warning{background:var(--warn-bg);color:var(--text);border:1px solid var(--warn);border-radius:10px;flex-basis:100%;margin:0;padding:10px 14px;font-size:.9rem}.notice{background:var(--warn-bg);border:1px solid var(--warn);border-radius:10px;padding:10px 14px}.question .stem{font-family:var(--sans);letter-spacing:0;white-space:pre-wrap;overflow-wrap:anywhere;margin:10px 0 16px;font-size:1.075rem;font-weight:600;line-height:1.5}.question .stem:focus{outline:none}.diagram{margin:0 0 16px}.diagram img{border:1px solid var(--border);background:#fff;border-radius:10px;width:100%;display:block}.diagram details{margin-top:8px;font-size:.9rem}.diagram summary{cursor:pointer;color:var(--accent);align-items:center;min-height:44px;font-weight:600;display:flex}.options{border:0;gap:10px;margin:0;padding:0;display:grid}.instruction{color:var(--muted);margin-bottom:10px;padding:0;font-size:.9rem;font-weight:600}.option{border:1px solid var(--border);background:var(--card);cursor:pointer;border-radius:12px;grid-template-columns:auto 1fr;align-items:start;gap:12px;min-height:44px;padding:14px;display:grid;position:relative}.option input{opacity:0;width:1px;height:1px;position:absolute}.option:hover{border-color:var(--muted)}.option:has(input:focus-visible){outline:3px solid var(--accent);outline-offset:2px}.option-letter{border:2px solid var(--border);width:28px;height:28px;color:var(--muted);border-radius:50%;place-items:center;font-size:.85rem;font-weight:700;display:inline-grid}.option input[type=checkbox]~.option-letter{border-radius:7px}.option.is-selected{background:var(--tint);border-color:var(--tint-border)}.option.is-selected .option-letter{background:var(--accent);border-color:var(--accent);color:var(--accent-text)}.option:has(input:disabled){cursor:default}.option:has(input:disabled):not(.is-selected):not(.is-right):not(.is-wrong){opacity:.6}.option.is-right{border-color:var(--ok);background:var(--ok-bg);border-width:2px}.option.is-wrong{border-color:var(--bad);background:var(--bad-bg);border-width:2px}.option-body{gap:6px;display:grid}.option-verdict{gap:4px;font-size:.92rem;display:grid}.rationale{color:var(--muted);font-size:.92rem;display:block}.ok{color:var(--ok)}.bad{color:var(--bad)}.feedback{border:1px solid var(--border);border-radius:12px;margin-top:16px;padding:16px}.feedback-ok{border-left:5px solid var(--ok)}.feedback-bad{border-left:5px solid var(--bad)}.feedback-title{margin-bottom:6px;font-size:1.05rem;font-weight:700}.feedback-ok .feedback-title{color:var(--ok)}.feedback-bad .feedback-title{color:var(--bad)}.small-heading{font-family:var(--sans);text-transform:uppercase;letter-spacing:.04em;color:var(--muted);margin:12px 0 6px;font-size:.85rem}.links{margin:0;padding-left:1.2rem}.links li{padding:4px 0}.bottom-nav{z-index:10;background:var(--card);border-top:1px solid var(--border);padding:10px 16px calc(10px + env(safe-area-inset-bottom));position:fixed;bottom:0;left:0;right:0}.bottom-inner{gap:8px;max-width:760px;margin:0 auto;display:flex}.grow{flex:1}.flag-on{background:var(--warn-bg);border-color:var(--warn);color:var(--warn)}.navigator-row{justify-content:center;margin-top:12px;display:flex}.dialog{width:100%;max-width:min(520px,100vw - 32px);color:var(--text)}.dialog::backdrop{background:#00000073}.dialog-actions{flex-wrap:wrap;justify-content:flex-end;gap:8px;margin-top:16px;display:flex}.nav-grid{grid-template-columns:repeat(auto-fill,minmax(48px,1fr));gap:8px;margin:0;padding:0;list-style:none;display:grid}.nav-cell{border:1px solid var(--border);background:var(--card);width:100%;min-height:44px;color:var(--text);font:inherit;cursor:pointer;border-radius:10px;font-weight:600;position:relative}.nav-cell.is-answered{background:var(--tint);border-color:var(--tint-border)}.nav-cell.is-answered:after{content:"●";color:var(--accent);font-size:.6rem;position:absolute;top:0;left:4px}.nav-cell.is-current{outline:2px solid var(--text)}.nav-flag{color:var(--warn);font-size:.7rem;position:absolute;top:0;right:3px}.setup{max-width:640px;margin:0 auto}.check{border:1px solid var(--border);cursor:pointer;border-radius:12px;align-items:flex-start;gap:12px;padding:12px;display:flex}.check input{width:22px;height:22px;accent-color:var(--accent);margin-top:2px}.resume{background:var(--tint);border-radius:12px;padding:14px}.results{max-width:900px;margin:0 auto}@media (width>=760px){.results-top{grid-template-columns:1.1fr 1fr}}.score-card h1:focus{outline:none}.actions{flex-wrap:wrap;gap:8px;display:flex}.bar-row{border-top:1px solid var(--border);padding:10px 0}.bar-row:first-of-type{border-top:0}.bar-label{justify-content:space-between;gap:12px;margin-bottom:6px;display:flex}.bar{background:var(--border);border-radius:999px;height:10px;overflow:hidden}.bar span{background:var(--accent);border-radius:999px;height:100%;display:block}.weak{margin:0 0 8px;padding-left:1.2rem}.weak li{padding:3px 0}.topics{border-collapse:collapse;width:100%;font-size:.95rem}.topics th,.topics td{text-align:left;border-top:1px solid var(--border);padding:10px 8px}.topics thead th{color:var(--muted);text-transform:uppercase;letter-spacing:.04em;border-top:0;font-size:.8rem}.topics tbody th{font-weight:500}.topics td{white-space:nowrap;font-variant-numeric:tabular-nums}.review-list{margin:0;padding:0;list-style:none}.review-list>li{border-top:1px solid var(--border)}.review-list summary{cursor:pointer;min-height:44px;padding:12px 0}.summary-stem{color:var(--muted);-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;display:-webkit-box;overflow:hidden}.review-body{padding-bottom:16px}.review-options{gap:8px;padding:0;list-style:none;display:grid}.review-options li{border:1px solid var(--border);border-radius:10px;padding:10px 12px}.review-options li.is-right{border:2px solid var(--ok);background:var(--ok-bg)}.review-options li.is-wrong{border:2px solid var(--bad);background:var(--bad-bg)}.signup{margin-top:24px}.signup-form label{font-weight:600}.signup-row{flex-wrap:wrap;gap:8px;margin:6px 0 12px;display:flex}.signup-row input{min-height:44px;font:inherit;border:1px solid var(--muted);background:var(--card);color:var(--text);border-radius:10px;flex:220px;padding:10px 12px}.signup-consent{align-items:flex-start;gap:10px;font-size:.92rem;display:flex;font-weight:400!important}.signup-consent input{width:22px;height:22px;accent-color:var(--accent);flex:none;margin-top:1px}.hp{width:1px;height:1px;position:absolute;left:-9999px;overflow:hidden}.player-shell{min-height:calc(100dvh - 104px)}.player-loading{min-height:320px}.field{gap:6px;font-weight:600;display:grid}.field input{font:inherit;border:1px solid var(--muted);background:var(--card);min-height:48px;color:var(--text);border-radius:10px;width:100%;padding:10px 12px;font-weight:400}.field input[name=code]{letter-spacing:.3em;font-variant-numeric:tabular-nums;max-width:12ch;font-size:1.4rem}.signin{max-width:480px}.notice-ok{background:var(--ok-bg);border-color:var(--ok)}.notice-bad{background:var(--bad-bg);border-color:var(--bad)}.account-bar{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;margin:0;display:flex}.set-list{gap:12px;margin:0;padding:0;list-style:none;display:grid}.set-card{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;display:flex}.set-card h3{margin:0 0 4px}.set-card p{margin:0}.bundle-card{border-color:var(--accent)}.bundle-card>div:first-child{flex:260px}.bundle-card p+p{margin-top:6px}.set-actions{gap:8px;display:flex}.set-card .buy{flex:260px;max-width:420px}.weak-list{margin:0;padding:0;list-style:none}.weak-list>li{border-top:1px solid var(--border);padding:10px 0}.weak-list>li:first-child{border-top:0}.legal{max-width:70ch}.legal h2{margin-top:1.75rem}.draft-banner{margin-bottom:1.5rem}.header-links{align-items:center;gap:4px;display:flex}@media (width<=480px){.header-links{gap:0}.header-links .btn{padding-left:10px;padding-right:10px}#theme-toggle .small{display:none}}@media (width<=360px){.header-links .btn{padding-left:7px;padding-right:7px}.brand{gap:6px;font-size:1.05rem}}.account-link{gap:8px}.avatar{background:var(--accent);width:26px;height:26px;color:var(--accent-text);border-radius:50%;place-items:center;font-size:.8rem;font-weight:700;line-height:1;display:inline-grid}.avatar[hidden]{display:none}:root{--side:248px;--side-gap:32px}body.wide .wrap{max-width:1240px}.course-menu{border:1px solid var(--border);border-radius:var(--radius);background:var(--card);margin-bottom:20px}.course-menu>summary{cursor:pointer;justify-content:space-between;align-items:center;gap:12px;min-height:48px;padding:8px 16px;font-weight:600;list-style:none;display:flex}.course-menu>summary::-webkit-details-marker{display:none}.course-menu>summary:after{content:"▾";color:var(--muted)}.course-menu[open]>summary:after{content:"▴"}.course-menu>summary span:first-child{margin-right:auto}.course-nav{border-top:1px solid var(--border);padding:4px 8px 12px}.course-nav ul{margin:0 0 8px;padding:0;list-style:none}.course-nav a{min-height:44px;color:var(--text);border-radius:10px;align-items:center;padding:6px 12px;text-decoration:none;display:flex}.course-nav a:hover{background:var(--tint);color:var(--accent)}.course-nav a[aria-current=page]{background:var(--tint);color:var(--accent);box-shadow:inset 3px 0 0 var(--accent);font-weight:700}.exam-switch{border-bottom:1px solid var(--border);margin:4px 0 0;padding-bottom:4px}.exam-switch>summary{cursor:pointer;border-radius:10px;justify-content:space-between;align-items:center;min-height:44px;padding:6px 12px;font-weight:600;list-style:none;display:flex}.exam-switch>summary::-webkit-details-marker{display:none}.exam-switch>summary:after{content:"▾";color:var(--muted)}.exam-switch[open]>summary:after{content:"▴"}.exam-switch>summary:hover{background:var(--tint)}.exam-switch ul{margin:0 0 4px}.exam-switch a{flex-direction:column;justify-content:center;align-items:flex-start;gap:0;line-height:1.3}.course-title{font-family:var(--serif);margin:8px 12px 4px;font-weight:600}.course-title a{min-height:44px;color:var(--text);padding:0;display:flex}.course-group{text-transform:uppercase;letter-spacing:.05em;color:var(--muted);flex-wrap:wrap;align-items:center;gap:8px;margin:12px 12px 2px;font-size:.78rem;font-weight:700;display:flex}.paid{border:1px solid var(--border);text-transform:none;letter-spacing:0;border-radius:999px;align-items:center;gap:3px;padding:1px 8px;font-weight:600;display:inline-flex}.course-main{min-width:0}@media (width>=960px){.course{grid-template-columns:var(--side) minmax(0, 1fr);gap:var(--side-gap);align-items:start;display:grid}.course-menu{max-height:calc(100vh - 32px);margin:0;position:sticky;top:16px;overflow-y:auto}.course-menu[open]>summary{display:none}.course-nav{border-top:0}.course .bottom-inner{left:calc((var(--side) + var(--side-gap)) / 2);max-width:min(760px, 100vw - 32px - var(--side) - var(--side-gap));position:relative}}.prep-box:not([data-has]) .prep-loading,.prep-box[data-has] .prep-initial-empty{display:none}.prep-box[data-has] .prep-loading{min-height:240px}.prep-grid{align-items:start;gap:16px;display:grid}@media (width>=720px){.prep-grid:not(.prep-grid-home){grid-template-columns:1fr 1fr}}.unfinished{background:var(--tint);border-color:var(--tint-border)}.unfinished p{margin:0}.next-step{margin-top:8px}.next-step .small-heading{margin:0}.history{margin:0;padding:0;list-style:none}.history li{border-top:1px solid var(--border);justify-content:space-between;align-items:baseline;gap:12px;padding:10px 0;display:flex}.history li:first-child{border-top:0}.history strong{white-space:nowrap;font-variant-numeric:tabular-nums}a.card{color:inherit;text-decoration:none;display:block}a.card:hover{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent), var(--shadow)}a.card:focus-visible{outline:3px solid var(--accent);outline-offset:3px;border-radius:var(--radius)}a.card h3{margin-top:10px}a.card p{margin-bottom:12px}.go{color:var(--accent);align-items:center;gap:6px;font-weight:700;display:inline-flex}a.card:hover .go{text-underline-offset:3px;text-decoration:underline}.block{display:block}.progress-grid{align-items:start}.course{padding-top:16px}.slot{cursor:default;grid-template-columns:1fr auto;align-items:center;gap:8px 12px;display:grid}.slot-match{grid-template-columns:1fr}.slot .option-verdict{grid-column:1/-1}.slot-pick{justify-items:center;gap:2px;display:grid}.slot select{min-height:44px;font:inherit;color:inherit;background:var(--card);border:1px solid var(--border);border-radius:10px;max-width:100%;padding:6px 10px}.slot-match select{width:100%}.table-scroll{overflow-x:auto}.orders{border-collapse:collapse;width:100%;font-size:.95rem}.orders th,.orders td{text-align:left;border-bottom:1px solid var(--border);vertical-align:top;padding:8px 10px 8px 0}.orders th{text-transform:uppercase;letter-spacing:.04em;color:var(--muted);font-size:.8rem;font-weight:600}.orders td:last-child,.orders th:last-child{text-align:right;white-space:nowrap;padding-right:0}.treeline[data-astro-cid-sisbqa3t]{color:var(--accent);fill:currentColor;opacity:.18;display:block}
