/* USMLE BANK — shared stylesheet for the guide/blog pages (all languages).
   One file so a new language only adds HTML, never CSS. */

:root{
  --paper:#F4F6FB;--surface:#FFFFFF;--ink:#13203A;--ink-soft:#46536B;
  --brand:#2450A6;--brand-deep:#1A3A7A;--amber:#F4B63F;--amber-soft:#FDF3DC;
  --line:#DAE1EE;--radius:14px;
  --display:'Bricolage Grotesque',sans-serif;
  --jp:'Zen Kaku Gothic New','Noto Sans JP',sans-serif;
  --kr-display:'Gothic A1','Noto Sans KR',sans-serif;
  --tc:'Noto Sans TC',sans-serif;
  --ar:'IBM Plex Sans Arabic',sans-serif;
  --body:'Public Sans','Noto Sans JP',sans-serif;
  --mono:'IBM Plex Mono',monospace;
}
/* Japanese pages set their own heading face; English pages keep the display face. */
[lang="ja"] h1,[lang="ja"] h2,[lang="ja"] h3,[lang="ja"] .card h2,[lang="ja"] .cta h2{font-family:var(--jp)}
[lang="ja"] body,[lang="ja"]{--body:'Noto Sans JP',sans-serif}
/* Korean pages get their own faces, and break at spaces the way Korean is written. */
[lang="ko"] h1,[lang="ko"] h2,[lang="ko"] h3,[lang="ko"] .card h2,[lang="ko"] .cta h2{font-family:var(--kr-display)}
[lang="ko"] body,[lang="ko"]{--body:'Noto Sans KR',sans-serif}
html[lang="ko"] body,html[lang="ko"] h1,html[lang="ko"] h2,html[lang="ko"] h3,
html[lang="ko"] p,html[lang="ko"] li,html[lang="ko"] td,html[lang="ko"] th,
html[lang="ko"] .lead,html[lang="ko"] .callout,html[lang="ko"] .series{word-break:keep-all;overflow-wrap:break-word}
/* Traditional Chinese pages set one face for headings and body. */
[lang="zh-Hant"] h1,[lang="zh-Hant"] h2,[lang="zh-Hant"] h3,[lang="zh-Hant"] .card h2,[lang="zh-Hant"] .cta h2{font-family:var(--tc)}
[lang="zh-Hant"] body,[lang="zh-Hant"]{--body:'Noto Sans TC',sans-serif}
/* Arabic pages set one face for headings and body. */
[lang="ar"] h1,[lang="ar"] h2,[lang="ar"] h3,[lang="ar"] .card h2,[lang="ar"] .cta h2{font-family:var(--ar)}
[lang="ar"] body,[lang="ar"]{--body:'IBM Plex Sans Arabic',sans-serif}

*{margin:0;padding:0;box-sizing:border-box}
body{background:var(--paper);color:var(--ink);font-family:var(--body);font-size:16px;line-height:1.9;-webkit-font-smoothing:antialiased}
html[lang="ja"] body{line-height:1.95}
html[lang="ko"] body{line-height:1.85}
html[lang="zh-Hant"] body{line-height:1.95}
html[lang="ar"] body{line-height:2}
a{color:var(--brand-deep)}
img{max-width:100%}
.wrap{max-width:760px;margin:0 auto;padding:0 24px}
.wrap.wide{max-width:820px}

/* header */
header{position:sticky;top:0;z-index:50;background:rgba(244,246,251,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px;max-width:1120px;margin:0 auto;padding:0 24px}
.logo{display:inline-flex;align-items:center;text-decoration:none}
.logo img{display:block;height:44px;width:auto}
.foot-grid .logo img{height:37px}
.lang-switch{font-family:var(--mono);font-size:12px;border:1px solid var(--line);border-radius:999px;padding:6px 14px;text-decoration:none;background:var(--surface);color:var(--ink-soft);white-space:nowrap}
.lang-switch:hover{border-color:var(--brand)}
.langnav{position:relative}
.langnav summary{list-style:none;cursor:pointer;user-select:none;display:inline-flex;align-items:center;gap:5px}
.langnav summary::-webkit-details-marker{display:none}
.langnav summary::after{content:"\2304";font-size:13px;line-height:1;transform:translateY(-1px)}
.langnav[open] summary{border-color:var(--brand);color:var(--brand-deep)}
.langnav-menu{position:absolute;top:calc(100% + 8px);right:0;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:6px;min-width:150px;box-shadow:0 10px 28px rgba(19,32,58,.12);z-index:60;display:flex;flex-direction:column;gap:2px}
.langnav-menu a{display:block;padding:9px 12px;border-radius:8px;font-size:14px;color:var(--ink-soft);text-decoration:none;white-space:nowrap}
.langnav-menu a:hover{background:var(--paper);color:var(--brand-deep)}
summary:focus-visible{outline:3px solid var(--amber);outline-offset:2px}

/* article shell */
main{padding:40px 0 24px}
.crumb{font-size:12.5px;color:var(--ink-soft);margin-bottom:16px}
.crumb a{text-decoration:none;color:var(--ink-soft)}
.crumb a:hover{color:var(--brand-deep)}
.mono{font-family:var(--mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--brand)}
h1{font-family:var(--display);font-weight:700;font-size:clamp(28px,3.8vw,38px);line-height:1.22;letter-spacing:-.022em;margin:10px 0 12px}
html[lang="ja"] h1{font-size:clamp(26px,3.6vw,36px);line-height:1.4}
html[lang="ko"] h1{font-size:clamp(26px,3.6vw,36px);line-height:1.34}
html[lang="zh-Hant"] h1{font-size:clamp(26px,3.6vw,36px);line-height:1.4}
html[lang="ar"] h1{font-size:clamp(26px,3.6vw,36px);line-height:1.5}
.byline{font-family:var(--mono);font-size:12px;color:#8A97AE;margin-bottom:30px;letter-spacing:.04em}
.byline a{color:var(--ink-soft);text-underline-offset:2px}
.lead{font-size:16.5px;color:var(--ink-soft);margin-bottom:34px}
h2{font-family:var(--display);font-weight:700;font-size:24px;line-height:1.3;letter-spacing:-.018em;margin:52px 0 14px;padding-top:12px;border-top:2px solid var(--line)}
html[lang="ja"] h2{font-size:23px;line-height:1.5}
html[lang="ko"] h2{font-size:23px;line-height:1.45}
html[lang="zh-Hant"] h2{font-size:23px;line-height:1.5}
html[lang="ar"] h2{font-size:23px;line-height:1.6}
h3{font-family:var(--display);font-weight:700;font-size:19px;line-height:1.4;margin:32px 0 10px}
html[lang="ja"] h3{font-size:18px;line-height:1.6}
html[lang="ko"] h3{font-size:18px;line-height:1.55}
html[lang="zh-Hant"] h3{font-size:18px;line-height:1.6}
html[lang="ar"] h3{font-size:18px;line-height:1.7}
p{margin:0 0 17px;color:var(--ink-soft)}
strong{color:var(--ink);font-weight:700}
code{font-family:var(--mono);font-size:.92em;background:#E6ECF6;border-radius:4px;padding:1px 6px;color:var(--brand-deep)}
ul,ol{margin:0 0 17px 24px;color:var(--ink-soft)}
li{margin-bottom:9px}

/* table of contents */
.toc{background:var(--surface);border:1.5px solid var(--line);border-radius:var(--radius);padding:22px 26px;margin-bottom:40px}
.toc p{font-family:var(--mono);font-size:11px;letter-spacing:.09em;text-transform:uppercase;color:var(--brand);margin-bottom:12px}
.toc ol{margin:0 0 0 20px;font-size:14.5px}
.toc li{margin-bottom:7px}
.toc a{text-decoration:none}
.toc a:hover{text-decoration:underline}

/* tables */
.tablewrap{overflow-x:auto;margin:0 0 20px;-webkit-overflow-scrolling:touch}
table{border-collapse:collapse;width:100%;min-width:460px;font-size:14.5px;background:var(--surface);border-radius:10px;overflow:hidden}
th,td{border:1px solid var(--line);padding:11px 14px;text-align:left;vertical-align:top;line-height:1.7}
th{background:#EDF1F9;font-weight:700;color:var(--ink);font-size:13.5px}
td{color:var(--ink-soft)}
td strong{color:var(--ink)}

/* callouts */
.callout{border-radius:var(--radius);padding:18px 22px;margin:24px 0;font-size:14.5px;line-height:1.8}
.callout .lbl{display:block;font-family:var(--mono);font-size:11px;letter-spacing:.09em;text-transform:uppercase;margin-bottom:7px}
.tip{background:var(--amber-soft);border:1px solid #F0DFAE;color:#7A5D12}
.tip .lbl{color:#8A6A14}
.note{background:#E8EEF8;border:1px solid #C9D5EC;color:#1F3560}
.note .lbl{color:var(--brand-deep)}
.warn{background:#FBEDE9;border:1px solid #F0CFC5;color:#8A3A24}
.warn .lbl{color:#A9452B}

/* practice-question box */
.qbox{background:var(--surface);border:1.5px solid var(--line);border-left:4px solid var(--brand);border-radius:10px;padding:22px 24px;margin:26px 0}
.qbox .tag{font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--brand);display:block;margin-bottom:12px}
.qbox .part{margin-bottom:12px}
.qbox .plabel{font-family:var(--mono);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;color:#8A97AE;display:block}
.qbox .en{color:var(--ink);font-weight:500;line-height:1.7;margin:0}
.qbox .ja,.qbox .ko,.qbox .zh-Hant,.qbox .es,.qbox .ar{font-size:13.5px;color:var(--ink-soft);line-height:1.75;margin:0}
.qbox .stem{color:var(--ink);font-weight:500;margin-bottom:14px;line-height:1.7}
.qbox ol{margin:14px 0 0 22px;font-size:14.5px}
.qbox li{margin-bottom:8px}
.qbox .ans{color:var(--brand-deep);font-weight:700}
.qbox .exp{margin-top:16px;padding-top:16px;border-top:1px dashed var(--line);font-size:14px;margin-bottom:0}
/* Domain articles quote the bank verbatim, so they carry the bank's own
   gloss style: an English term with its Japanese reading attached. The
   reader is a nurse who does not read English — the gloss is the point. */
.tw{font-weight:600;color:var(--ink)}
.tw + .gl,.gl{font-size:.88em;color:var(--ink-soft);font-weight:400}
/* Options need the Japanese under them for the same reason. */
.qbox .oj{display:block;font-size:12.5px;color:#7A879E;line-height:1.6;margin-top:2px}
.qbox li{margin-bottom:12px}
.src{font-family:var(--mono);font-size:11px;color:#8A97AE;letter-spacing:.03em;margin-top:14px;padding-top:12px;border-top:1px dashed var(--line)}

/* misc content blocks */
.steps{counter-reset:st;list-style:none;margin:0 0 20px}
.steps>li{counter-increment:st;position:relative;padding-left:44px;margin-bottom:22px}
.steps>li::before{content:counter(st);position:absolute;left:0;top:2px;width:30px;height:30px;border-radius:50%;background:var(--brand);color:#fff;font-family:var(--mono);font-size:14px;display:flex;align-items:center;justify-content:center}
.steps h3{margin:0 0 6px}
.check{list-style:none;margin:0 0 20px;background:var(--surface);border:1.5px solid var(--line);border-radius:var(--radius);padding:20px 24px}
.check li{position:relative;padding-left:26px;margin-bottom:11px;font-size:15px}
.check li:last-child{margin-bottom:0}
.check li::before{content:"";position:absolute;left:0;top:10px;width:13px;height:8px;border-left:2.5px solid var(--brand);border-bottom:2.5px solid var(--brand);transform:rotate(-45deg)}
.ladder{list-style:none;margin:0 0 20px}
.ladder li{background:var(--surface);border:1.5px solid var(--line);border-radius:10px;padding:13px 18px;margin-bottom:8px;font-size:14.5px}
.ladder li strong{display:block;color:var(--brand-deep)}
.flow{background:var(--surface);border:1.5px solid var(--line);border-radius:var(--radius);padding:22px 26px;margin:0 0 22px}
.flow ol{margin:0 0 0 20px;font-size:15px}
.flow li{margin-bottom:11px}
.words{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 20px}
.words span{font-family:var(--mono);font-size:13px;background:var(--surface);border:1.5px solid var(--line);border-radius:999px;padding:7px 15px;color:var(--brand-deep)}

/* index listing */
.series{background:var(--amber-soft);border:1px solid #F0DFAE;border-radius:var(--radius);padding:18px 22px;margin-bottom:34px;font-size:14.5px;color:#7A5D12}
.cards{display:grid;gap:16px;list-style:none;margin:0}
.card{background:var(--surface);border:1.5px solid var(--line);border-radius:var(--radius);transition:border-color .14s ease,transform .14s ease;margin:0}
.card:hover{border-color:var(--brand);transform:translateY(-2px)}
.card a{display:block;padding:22px 24px;text-decoration:none;color:inherit}
.card .no{font-family:var(--mono);font-size:11px;letter-spacing:.09em;color:var(--brand);display:block;margin-bottom:7px}
.card h2{font-size:19px;font-weight:700;line-height:1.4;letter-spacing:-.01em;margin:0 0 8px;border:0;padding:0}
.card p{font-size:14px;color:var(--ink-soft);line-height:1.75;margin:0}
.card .meta{font-family:var(--mono);font-size:11px;color:#8A97AE;margin-top:12px;letter-spacing:.04em}
.card.soon{opacity:.62}
.card.soon:hover{border-color:var(--line);transform:none}
.card.soon .no{color:#8A97AE}
/* A second run of cards under the numbered series: domain articles. */
.sec{font-size:20px;margin:48px 0 10px}
html[lang="ja"] .sec,html[lang="ko"] .sec,html[lang="zh-Hant"] .sec{font-size:19px}
.secnote{font-size:14px;margin-bottom:18px}

/* The domain index. A card is ~340px on a phone; twenty of them is a ten-screen
   scroll for a list you arrive at knowing which entry you want. A row is ~50px. */
.topics{margin:0 0 8px}
.topic{padding:18px 0;border-top:1px solid var(--line)}
.topic:last-child{border-bottom:1px solid var(--line)}
.topic h3{
  font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:var(--brand);
  margin:0 0 6px;padding:0;font-weight:500;
}
html[lang="ja"] .topic h3,html[lang="ko"] .topic h3,html[lang="zh-Hant"] .topic h3{font-size:12px;line-height:1.6}
.topic ul{list-style:none;margin:0}
.topic li{margin:0}
.topic a{
  display:block;padding:9px 0;text-decoration:none;color:var(--ink);
  font-size:15.5px;line-height:1.65;
}
.topic a:hover{color:var(--brand-deep)}
@media (min-width:680px){
  /* The heading sits beside its list rather than above it, so a section with
     one entry costs one row instead of three. */
  .topic{display:grid;grid-template-columns:132px 1fr;gap:20px;align-items:start}
  .topic h3{margin-top:10px}
}

/* author */
.author-box{display:flex;gap:16px;align-items:flex-start;margin:48px 0 0;padding:20px 22px;background:var(--surface);border:1.5px solid var(--line);border-radius:var(--radius)}
.author-box img{width:64px;height:64px;border-radius:50%;object-fit:cover;object-position:50% 30%;flex:none}
.author-box .lbl{display:block;font-family:var(--mono);font-size:11px;letter-spacing:.09em;text-transform:uppercase;color:var(--brand)}
.author-box .name{font-weight:700;font-size:16px;margin:2px 0 4px}
.author-box .name a{color:var(--ink);text-decoration:none}
.author-box .name a:hover{color:var(--brand-deep);text-decoration:underline}
.author-box p{font-size:14px;line-height:1.75;margin:0}
.profile-head{display:flex;gap:24px;align-items:center;margin:6px 0 8px}
.profile-head img{width:120px;height:120px;border-radius:50%;object-fit:cover;object-position:50% 30%;flex:none}
.profile-head h1{margin:0 0 6px}
.profile-head .lead{margin:0}
@media (max-width:520px){.profile-head{flex-direction:column;align-items:flex-start;gap:14px}}
.author-posts li{margin-bottom:6px}

/* cta + pager */
.cta{margin:56px 0 8px;background:var(--surface);border:1.5px solid var(--line);border-radius:var(--radius);padding:30px 28px;text-align:center}
.cta h2{font-size:20px;font-weight:700;margin:0 0 10px;border:0;padding:0}
.cta p{font-size:14.5px;margin-bottom:20px}
.cta-mid{margin:34px 0;padding:22px 20px}
.cta-mid p{margin-bottom:16px}
.btn{display:inline-block;background:var(--brand);color:#fff;text-decoration:none;font-weight:700;font-size:15px;padding:13px 30px;border-radius:999px}
.btn:hover{background:var(--brand-deep)}
.nextprev{display:flex;justify-content:space-between;gap:14px;margin-top:38px;font-size:14px}
.nextprev a{text-decoration:none}
.nextprev span{color:#8A97AE}

/* footer */
footer{padding:40px 0;border-top:1px solid var(--line);background:var(--surface);margin-top:56px}
.foot-links{display:flex;gap:20px;flex-wrap:wrap;list-style:none;font-size:13px;justify-content:center;margin:0}
.foot-links li{margin:0}
.foot-links a{text-decoration:none;color:var(--ink-soft)}
.foot-links a:hover{color:var(--brand-deep)}
.disclaimer{margin-top:20px;font-size:12px;color:#8A97AE;text-align:center;line-height:1.75}
a:focus-visible{outline:3px solid var(--amber);outline-offset:2px}

/* Right to left (Arabic). Flex and grid mirror by themselves; what follows is
   every rule above that names a side, plus letter-spacing and uppercase, which
   pull Arabic's joined letters apart. The English question and options keep
   dir="ltr" (set by the build), so their own rules apply unmirrored. */
[dir="rtl"] h1,[dir="rtl"] h2,[dir="rtl"] h3,[dir="rtl"] .mono,[dir="rtl"] .byline,
[dir="rtl"] .callout .lbl,[dir="rtl"] .toc p,[dir="rtl"] .qbox .tag,[dir="rtl"] .qbox .plabel,
[dir="rtl"] .card .no,[dir="rtl"] .card .meta,[dir="rtl"] .topic h3,[dir="rtl"] .author-box .lbl,
[dir="rtl"] .card h2{letter-spacing:0;text-transform:none}
[dir="rtl"] .mono,[dir="rtl"] .byline,[dir="rtl"] .callout .lbl,[dir="rtl"] .toc p,
[dir="rtl"] .qbox .tag,[dir="rtl"] .qbox .plabel,[dir="rtl"] .card .no,[dir="rtl"] .card .meta,
[dir="rtl"] .topic h3,[dir="rtl"] .author-box .lbl{font-family:var(--ar)}
[dir="rtl"] .mono,[dir="rtl"] .qbox .tag,[dir="rtl"] .callout .lbl,[dir="rtl"] .toc p{font-size:13px}
[dir="rtl"] ul,[dir="rtl"] ol{margin:0 24px 17px 0}
[dir="rtl"] .toc ol,[dir="rtl"] .flow ol{margin:0 20px 0 0}
[dir="rtl"] .steps,[dir="rtl"] .check,[dir="rtl"] .ladder,[dir="rtl"] .cards,[dir="rtl"] .topic ul{margin-right:0}
[dir="rtl"] .steps>li{padding-left:0;padding-right:44px}
[dir="rtl"] .steps>li::before{left:auto;right:0}
[dir="rtl"] .check li{padding-left:0;padding-right:26px}
[dir="rtl"] .check li::before{left:auto;right:0}
[dir="rtl"] th,[dir="rtl"] td{text-align:right}
[dir="rtl"] .qbox{border-left:1.5px solid var(--line);border-right:4px solid var(--brand)}
[dir="rtl"] .qbox ol[dir="ltr"]{margin:14px 0 0 22px}
[dir="rtl"] .qbox [dir="ltr"] .oj{text-align:left}
[dir="rtl"] .langnav-menu{right:auto;left:0}
[dir="rtl"] code,[dir="rtl"] .words span{direction:ltr;unicode-bidi:isolate}

[dir="rtl"] .crumb a,[dir="rtl"] .nextprev a{unicode-bidi:isolate}