/* Theorieheft — design system: German road-sign palette, self-hosted fonts */
@font-face{font-family:'Archivo Variable';font-style:normal;font-display:swap;font-weight:100 900;font-stretch:62% 125%;src:url(/assets/fonts/archivo-latin-wdth-normal.woff2) format('woff2-variations');}
@font-face{font-family:'Inter Variable';font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/fonts/inter-latin-wght-normal.woff2) format('woff2-variations');}

:root{
  --blue:#1B5FAA;
  --blue-deep:#134C88;
  --yellow:#F2B705;
  --red:#B3231C;
  --green:#2E7D42;
  --green-ink:#2E7D42;
  --asphalt:#1C1F22;

  --bg:#F6F5F1;
  --surface:#FFFFFF;
  --surface-2:#EFEDE6;
  --text:#1C1F22;
  --text-dim:#5D6268;
  --line:#DEDBD3;
  --accent:#1B5FAA;          /* blue used for text on surfaces */
  --accent-soft:rgba(27,95,170,.10);
  --red-soft:rgba(179,35,28,.07);
  --green-soft:rgba(46,125,66,.11);
  --yellow-ink:#7a5a00;

  --radius:16px;
  --radius-sm:10px;
  --topbar-h:56px;
  --safe-top:env(safe-area-inset-top,0px);
  --safe-bottom:env(safe-area-inset-bottom,0px);

  --f-head:'Archivo Variable','Archivo',system-ui,-apple-system,'Segoe UI',sans-serif;
  --f-body:'Inter Variable','Inter',system-ui,-apple-system,'Segoe UI',sans-serif;
  color-scheme:light;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#14161A;--surface:#1E2125;--surface-2:#272B30;--text:#F1EFE9;--text-dim:#A3A8AE;
    --line:#33373C;--accent:#7DB2EA;--accent-soft:rgba(125,178,234,.13);
    --red-soft:rgba(240,110,100,.10);--green-soft:rgba(90,190,120,.13);--yellow-ink:#F2B705;--green-ink:#6FCF8A;
    color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#14161A;--surface:#1E2125;--surface-2:#272B30;--text:#F1EFE9;--text-dim:#A3A8AE;
  --line:#33373C;--accent:#7DB2EA;--accent-soft:rgba(125,178,234,.13);
  --red-soft:rgba(240,110,100,.10);--green-soft:rgba(90,190,120,.13);--yellow-ink:#F2B705;--green-ink:#6FCF8A;
  color-scheme:dark;
}

*{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--topbar-h) + var(--safe-top) + 70px);scroll-behavior:smooth;}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:var(--f-body);font-size:16px;line-height:1.55;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
h1,h2,h3{font-family:var(--f-head);font-stretch:112%;letter-spacing:-.01em;margin:0;}
a{color:var(--accent);}
button{font:inherit;color:inherit;}
:focus-visible{outline:3px solid var(--yellow);outline-offset:2px;border-radius:6px;}
.hidden{display:none !important;}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;}
.skip{position:absolute;left:-999px;top:8px;background:var(--yellow);color:var(--asphalt);padding:8px 14px;border-radius:8px;z-index:100;font-weight:600;}
.skip:focus{left:8px;}

.wrap{max-width:680px;margin:0 auto;padding:0 18px 72px;}

/* ───── Top bar (motorway direction sign) ───── */
.topbar{
  position:sticky;top:0;z-index:30;
  background:var(--blue);color:#fff;
  height:calc(var(--topbar-h) + var(--safe-top));padding:var(--safe-top) 14px 0;
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  box-shadow:0 2px 0 var(--blue-deep);
}
.brand{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none;min-width:0;}
.brand .mark{
  width:32px;height:32px;border-radius:7px;background:var(--yellow);color:var(--asphalt);flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--f-head);font-stretch:125%;font-weight:800;font-size:15px;
}
.brand .name{font-family:var(--f-head);font-stretch:112%;font-weight:700;font-size:19px;letter-spacing:-.01em;}
.topbar-actions{display:flex;align-items:center;gap:8px;}
.icon-btn,.top-link{
  height:36px;min-width:36px;padding:0 11px;border-radius:9px;
  border:1.5px solid rgba(255,255,255,.5);background:transparent;color:#fff;
  font-size:14px;font-weight:600;cursor:pointer;text-decoration:none;
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
}
.icon-btn:hover,.top-link:hover{background:rgba(255,255,255,.14);}

/* ───── Home hero (blue sign with white inset border) ───── */
.hero{
  margin-top:18px;position:relative;
  background:var(--blue);color:#fff;border-radius:20px;
  padding:26px 22px 22px;
  box-shadow:inset 0 0 0 3px var(--blue),inset 0 0 0 5px rgba(255,255,255,.9);
}
.hero .kicker{margin:0 0 8px;font-size:12.5px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:#CFE0F5;}
.hero h1{font-size:clamp(25px,6.4vw,33px);line-height:1.12;font-weight:800;margin:0 0 10px;}
.hero p.lead{margin:0 0 18px;color:#E6EFFA;font-size:15.5px;max-width:52ch;}
.hero-progress{background:rgba(0,0,0,.18);border-radius:12px;padding:12px 14px;margin-bottom:14px;}
.hero-progress .row{display:flex;justify-content:space-between;align-items:baseline;gap:10px;font-size:13.5px;font-weight:600;margin-bottom:8px;}
.hero-progress .row span:last-child{color:#CFE0F5;font-weight:500;white-space:nowrap;}
.bar{height:8px;border-radius:99px;background:rgba(255,255,255,.22);overflow:hidden;}
.bar > i{display:block;height:100%;width:0;background:var(--yellow);border-radius:99px;transition:width .5s cubic-bezier(.2,.7,.2,1);}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:48px;padding:0 20px;border-radius:12px;border:2px solid transparent;
  font-family:var(--f-head);font-stretch:108%;font-weight:700;font-size:15px;cursor:pointer;text-decoration:none;
  transition:transform .12s ease,background .15s ease;
}
.btn:active{transform:scale(.98);}
.btn-yellow{background:var(--yellow);color:var(--asphalt);}
.btn-yellow:hover{background:#ffc61a;}
.btn-blue{background:var(--blue);color:#fff;}
.btn-blue:hover{background:var(--blue-deep);}
.btn-ghost{background:transparent;color:var(--accent);border-color:var(--accent);}
.btn-ghost:hover{background:var(--accent-soft);}
.btn-block{width:100%;}

/* ───── Search + grid ───── */
.section-head{display:flex;align-items:baseline;justify-content:space-between;gap:10px;margin:30px 0 12px;}
.section-head h2{font-size:19px;font-weight:700;}
.section-head .hint{font-size:13px;color:var(--text-dim);}
.search{position:relative;}
.search input{
  width:100%;height:50px;padding:0 44px 0 44px;border-radius:13px;
  border:1.5px solid var(--line);background:var(--surface);color:var(--text);
  font-family:var(--f-body);font-size:16px;
}
.search input::placeholder{color:var(--text-dim);}
.search input:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px var(--accent-soft);}
.search input::-webkit-search-cancel-button,.search input::-webkit-search-decoration{-webkit-appearance:none;appearance:none;display:none;}
.search .ico{position:absolute;left:15px;top:50%;transform:translateY(-50%);color:var(--text-dim);pointer-events:none;font-size:17px;}
.search .clear{position:absolute;right:6px;top:50%;transform:translateY(-50%);width:38px;height:38px;border:none;background:none;color:var(--text-dim);font-size:20px;cursor:pointer;border-radius:8px;}
.results{margin-top:12px;display:grid;gap:8px;}
.result{display:block;text-decoration:none;color:var(--text);background:var(--surface);border:1.5px solid var(--line);border-radius:12px;padding:12px 14px;}
.result:hover{border-color:var(--blue);}
.result b{font-family:var(--f-head);font-stretch:106%;font-size:14.5px;}
.result small{display:block;color:var(--text-dim);font-size:13px;margin-top:3px;line-height:1.45;}
.result mark{background:rgba(242,183,5,.4);color:inherit;border-radius:3px;padding:0 1px;}
.no-results{color:var(--text-dim);font-size:14.5px;padding:6px 2px;}

.grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;}
@media (min-width:560px){.grid{grid-template-columns:1fr 1fr 1fr;}}
.tile{
  position:relative;display:flex;flex-direction:column;justify-content:space-between;gap:14px;
  min-height:142px;padding:14px 14px 13px;text-decoration:none;color:var(--text);
  background:var(--surface);border:1.5px solid var(--line);border-radius:var(--radius);
  transition:transform .15s ease,border-color .15s ease,box-shadow .15s ease;
}
.tile:hover{border-color:var(--blue);box-shadow:0 4px 14px rgba(19,76,136,.10);}
.tile:active{transform:scale(.98);}
.tile .top{display:flex;align-items:flex-start;justify-content:space-between;}
.chip{
  width:38px;height:38px;border-radius:10px;display:flex;align-items:center;justify-content:center;
  font-size:19px;font-weight:700;flex-shrink:0;
}
.blue .chip{background:var(--accent-soft);color:var(--accent);}
.yellow .chip{background:rgba(242,183,5,.2);color:var(--yellow-ink);}
.red .chip{background:var(--red-soft);color:var(--red);}
:root[data-theme="dark"] .red .chip{color:#F08A82;}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .red .chip{color:#F08A82;}}
.tile .num{font-family:var(--f-head);font-stretch:120%;font-weight:700;font-size:12px;color:var(--text-dim);}
.tile .tname{font-family:var(--f-head);font-stretch:104%;font-weight:700;font-size:15.5px;line-height:1.22;margin:0 0 5px;}
.tile .tmeta{margin:0;color:var(--text-dim);font-size:12.5px;line-height:1.35;}
.tile .state{display:inline-block;margin-top:8px;font-size:11.5px;font-weight:700;padding:3px 8px;border-radius:99px;}
.state.best{color:var(--green-ink);background:var(--green-soft);}
.state.todo{color:var(--text-dim);background:var(--surface-2);}
.state.perfect{color:#fff;background:var(--green);}

/* ───── FAQ / prose ───── */
.faq details{background:var(--surface);border:1.5px solid var(--line);border-radius:13px;margin-bottom:10px;overflow:hidden;}
.faq summary{
  padding:15px 16px;cursor:pointer;font-weight:600;font-size:15px;list-style:none;
  display:flex;justify-content:space-between;align-items:center;gap:12px;
}
.faq summary::-webkit-details-marker{display:none;}
.faq summary::after{content:'+';color:var(--text-dim);font-size:20px;line-height:1;flex-shrink:0;}
.faq details[open] summary::after{content:'–';}
.faq details p{margin:0;padding:0 16px 16px;color:var(--text-dim);font-size:15px;}
.prose h1{font-size:28px;margin:26px 0 8px;}
.prose h2{font-size:19px;margin:26px 0 8px;}
.prose p,.prose li{color:var(--text);font-size:15.5px;}
.prose ul{padding-left:20px;}
.prose .muted{color:var(--text-dim);}
.todo-note{background:var(--red-soft);border-left:4px solid var(--red);padding:12px 14px;border-radius:0 10px 10px 0;font-size:14px;margin:16px 0;}

footer.site{margin-top:44px;padding-top:20px;border-top:1px solid var(--line);color:var(--text-dim);font-size:13px;line-height:1.6;text-align:center;}
footer.site nav{display:flex;justify-content:center;gap:18px;margin-bottom:10px;flex-wrap:wrap;}
footer.site a{color:var(--text-dim);}

/* ───── Topic page ───── */
.crumbs{margin:16px 0 0;font-size:13px;color:var(--text-dim);}
.crumbs a{color:var(--text-dim);text-decoration:none;}
.crumbs a:hover{text-decoration:underline;}
.topic-head{padding:10px 0 4px;display:flex;gap:14px;align-items:flex-start;}
.topic-head .chip{width:48px;height:48px;font-size:24px;border-radius:13px;margin-top:4px;}
.topic-head h1{font-size:clamp(23px,6vw,28px);line-height:1.15;font-weight:800;}
.topic-head p{margin:6px 0 0;color:var(--text-dim);font-size:15px;}
.meta-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px;margin:12px 0 0;font-size:13px;color:var(--text-dim);}
.meta-row .pill{padding:3px 9px;border-radius:99px;background:var(--surface-2);font-weight:600;}
.link-btn{background:none;border:none;color:var(--accent);font-weight:600;font-size:13px;cursor:pointer;padding:4px 2px;text-decoration:underline;text-underline-offset:3px;}

.tabs{
  position:sticky;top:calc(var(--topbar-h) + var(--safe-top));z-index:20;
  display:flex;gap:6px;padding:10px 0;margin-top:8px;background:var(--bg);
}
.tab{
  flex:1;min-height:44px;border-radius:11px;border:1.5px solid var(--line);background:var(--surface);
  font-family:var(--f-head);font-stretch:106%;font-weight:700;font-size:14.5px;color:var(--text-dim);cursor:pointer;
}
.tab[aria-selected="true"]{background:var(--blue);border-color:var(--blue);color:#fff;}
.tab .count{font-weight:600;opacity:.8;margin-left:4px;}

.toolbar{display:flex;justify-content:flex-end;gap:14px;margin:4px 0 2px;}

.section{background:var(--surface);border:1.5px solid var(--line);border-radius:var(--radius);margin:10px 0;overflow:hidden;}
.section > summary{
  list-style:none;cursor:pointer;padding:16px 16px;
  display:flex;justify-content:space-between;align-items:center;gap:12px;
  font-family:var(--f-head);font-stretch:104%;font-weight:700;font-size:15.5px;line-height:1.3;
}
.section > summary::-webkit-details-marker{display:none;}
.section > summary::after{
  content:'';width:9px;height:9px;flex-shrink:0;margin-right:3px;
  border-right:2.5px solid var(--text-dim);border-bottom:2.5px solid var(--text-dim);
  transform:rotate(45deg) translateY(-2px);transition:transform .2s ease;
}
.section[open] > summary::after{transform:rotate(-135deg) translateY(-2px);}
.section[open] > summary{border-bottom:1px solid var(--line);}
.section .body{padding:14px 16px 8px;font-size:15.5px;line-height:1.65;}
.section .body p{margin:0 0 12px;}
.section .body ul,.section .body ol{margin:0 0 12px;padding-left:21px;}
.section .body li{margin-bottom:7px;}

table.fact{width:100%;border-collapse:collapse;margin:4px 0 14px;font-size:14px;}
table.fact th,table.fact td{text-align:left;padding:9px 8px;border-bottom:1px solid var(--line);vertical-align:top;}
table.fact th{color:var(--text-dim);font-weight:600;font-size:12.5px;}
table.fact tr:last-child td{border-bottom:none;}
.overflow{overflow-x:auto;-webkit-overflow-scrolling:touch;}
.num-em{font-family:var(--f-head);font-stretch:118%;font-weight:700;color:var(--accent);white-space:nowrap;}
.trap-box{border-left:4px solid var(--red);background:var(--red-soft);border-radius:0 10px 10px 0;padding:12px 14px;margin:10px 0;}
.trap-box strong{color:var(--red);}
:root[data-theme="dark"] .trap-box strong{color:#F08A82;}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .trap-box strong{color:#F08A82;}}

.cta-card{
  margin:20px 0 6px;padding:20px;border-radius:var(--radius);text-align:center;
  background:var(--surface);border:1.5px dashed var(--blue);
}
.cta-card h2{font-size:18px;margin-bottom:6px;}
.cta-card p{margin:0 0 14px;color:var(--text-dim);font-size:14.5px;}

.pager{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:26px;}
.pager a{
  display:flex;flex-direction:column;gap:2px;padding:12px 14px;border-radius:13px;text-decoration:none;
  background:var(--surface);border:1.5px solid var(--line);color:var(--text);min-height:64px;
}
.pager a:hover{border-color:var(--blue);}
.pager small{color:var(--text-dim);font-size:12px;font-weight:600;}
.pager b{font-family:var(--f-head);font-stretch:104%;font-size:14px;line-height:1.25;}
.pager a:last-child{text-align:right;}
.pager .empty{visibility:hidden;}

/* ───── Quiz ───── */
.quiz-card{background:var(--surface);border:1.5px solid var(--line);border-radius:var(--radius);padding:18px;margin-top:6px;}
.quiz-top{display:flex;justify-content:space-between;align-items:center;font-size:13px;color:var(--text-dim);font-weight:600;margin-bottom:8px;}
.quiz-card .bar{background:var(--surface-2);margin-bottom:16px;}
.quiz-card .bar > i{background:var(--blue);}
.quiz-prompt{font-family:var(--f-head);font-stretch:104%;font-size:18px;font-weight:700;line-height:1.35;margin:0 0 16px;}
.opt{
  display:flex;gap:12px;align-items:flex-start;width:100%;text-align:left;
  padding:13px 14px;margin-bottom:10px;border-radius:12px;
  border:1.5px solid var(--line);background:var(--bg);color:var(--text);
  font-size:15.5px;line-height:1.4;cursor:pointer;transition:border-color .12s ease,background .12s ease;
}
.opt:hover:not([disabled]){border-color:var(--blue);}
.opt .key{
  flex-shrink:0;width:26px;height:26px;border-radius:7px;background:var(--surface-2);
  display:flex;align-items:center;justify-content:center;font-size:12.5px;font-weight:700;color:var(--text-dim);margin-top:-1px;
}
.opt[disabled]{cursor:default;}
.opt.correct{border-color:var(--green);background:var(--green-soft);}
.opt.correct .key{background:var(--green);color:#fff;}
.opt.incorrect{border-color:var(--red);background:var(--red-soft);}
.opt.incorrect .key{background:var(--red);color:#fff;}
.opt.dim{opacity:.6;}
.feedback{margin:4px 0 0;padding:13px 15px;border-radius:12px;font-size:15px;line-height:1.55;background:var(--surface-2);}
.feedback .verdict{display:block;font-family:var(--f-head);font-stretch:106%;font-weight:800;font-size:15px;margin-bottom:3px;}
.feedback.ok .verdict{color:var(--green-ink);}
.feedback.no .verdict{color:var(--red);}
:root[data-theme="dark"] .feedback.no .verdict{color:#F08A82;}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .feedback.no .verdict{color:#F08A82;}}
.quiz-foot{margin-top:14px;display:flex;gap:10px;align-items:center;}
.quiz-foot .btn{flex:1;}
.kbd-hint{font-size:12px;color:var(--text-dim);text-align:center;margin-top:10px;}
@media (hover:none){.kbd-hint{display:none;}}

.result{}
.score-card{text-align:center;padding:26px 16px 22px;}
.score-card .label{font-size:12.5px;letter-spacing:.07em;font-weight:700;color:var(--text-dim);}
.score-card .score{font-family:var(--f-head);font-stretch:125%;font-weight:800;font-size:54px;color:var(--accent);line-height:1.1;margin:6px 0;}
.score-card .verdict{font-size:15.5px;margin:0 0 18px;color:var(--text-dim);}
.score-actions{display:grid;gap:10px;}
.review{margin-top:20px;}
.review h3{font-size:16px;margin-bottom:10px;}
.review-item{background:var(--surface);border:1.5px solid var(--line);border-radius:13px;padding:14px;margin-bottom:10px;border-left:4px solid var(--red);}
.review-item p{margin:0 0 8px;font-size:15px;}
.review-item .you{color:var(--red);font-size:14px;}
.review-item .right{color:var(--green-ink);font-size:14px;font-weight:600;}
.review-item .why{color:var(--text-dim);font-size:14px;margin-top:6px;}

/* ───── Consent banner ───── */
.consent-banner{
  position:fixed;left:0;right:0;bottom:0;z-index:60;
  background:var(--asphalt);color:#fff;
  padding:14px 18px calc(14px + var(--safe-bottom));
  display:flex;align-items:center;gap:14px;flex-wrap:wrap;box-shadow:0 -2px 14px rgba(0,0,0,.25);
}
.consent-banner p{margin:0;font-size:13px;line-height:1.5;flex:1;min-width:220px;color:#E8E6E0;}
.consent-banner a{color:#fff;}
.consent-actions{display:flex;gap:8px;}
.consent-btn{border-radius:9px;padding:10px 16px;font-weight:600;font-size:13.5px;cursor:pointer;border:1.5px solid rgba(255,255,255,.4);background:transparent;color:#fff;}
.consent-btn.accept{background:var(--yellow);color:var(--asphalt);border-color:var(--yellow);}

.toast{
  position:fixed;left:50%;bottom:calc(24px + var(--safe-bottom));transform:translateX(-50%) translateY(20px);opacity:0;
  background:var(--asphalt);color:#fff;padding:11px 18px;border-radius:99px;font-size:14px;font-weight:600;z-index:70;
  transition:all .25s ease;pointer-events:none;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0);}

@media (prefers-reduced-motion: reduce){
  *{transition:none !important;scroll-behavior:auto !important;}
}
@media print{
  .topbar,.tabs,.toolbar,.cta-card,.pager,.consent-banner,.hero-progress,footer.site{display:none !important;}
  .section{break-inside:avoid;} details.section .body{display:block;}
  body{background:#fff;color:#000;}
}

.sign-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(104px,1fr));gap:10px;margin:6px 0 4px;}
.sign{margin:0;text-align:center;background:var(--card,#fff);border:1px solid var(--line,#ddd);border-radius:12px;padding:10px 6px 8px;}
.sign svg{width:72px;height:72px;display:block;margin:0 auto 6px;}
.sign figcaption{font-size:.78rem;line-height:1.25;color:inherit;opacity:.85;}
.sign-note{font-size:.78rem;opacity:.7;margin:4px 0 12px;}

.opt.picked{border-color:var(--blue);background:var(--blue-soft,rgba(27,95,170,.1));}
.opt.picked .key{background:var(--blue);color:#fff;}
.multi-hint{margin:-4px 0 10px;font-size:.85rem;font-weight:600;color:var(--blue);}
.btn[disabled]{opacity:.5;cursor:not-allowed;}
.lang-switch{display:inline-flex;align-items:center;height:36px;padding:0 10px;border:1px solid var(--line,#ddd);border-radius:999px;font-size:.8rem;font-weight:700;text-decoration:none;color:inherit;margin-right:6px;}
.lang-switch:hover{border-color:var(--blue);color:var(--blue);}