/* Sectional Chart Trainer. Family tokens and rules: ../METAR/DESIGN.md ("Chart Paper"). */
@font-face{font-family:'Archivo';font-style:normal;font-weight:400 900;font-stretch:72% 118%;font-display:swap;src:url('fonts/archivo-v25-f51f73c6.woff2') format('woff2')}
@font-face{font-family:'Chivo Mono';font-style:normal;font-weight:400 600;font-display:swap;src:url('fonts/chivo-mono-v11-0ca745ce.woff2') format('woff2')}

:root{
  color-scheme:light;
  --school:var(--school-paper,#1A2744); --school-accent:#C8A84E; --on-school:#FFFFFF;
  --paper:#F3ECDC; --paper-now:#E9E0CB; --sheet:#FBF7EE; --field:#FFFFFF;
  --ink:#1D1C19; --ink-2:#4A4538; --rule:#B9AE95; --tick:#6B6250;
  --blue:#1E58A8; --magenta:#A21F6A; --red:#8E1022; --ochre:#8F5400;
  --sans:'Archivo','Arial Narrow',system-ui,sans-serif;
  --mono:'Chivo Mono',ui-monospace,monospace;
  --rail:280px;
}
:root[data-theme="dim"]{
  color-scheme:dark;
  --school:var(--school-dim,#8EA2D8); --on-school:#1D1C19;
  --paper:#2A2723; --paper-now:#35312B; --sheet:#312D28; --field:#221F1C;
  --ink:#EDE4D0; --ink-2:#BDB29C; --rule:#5C5448; --tick:#A99E88;
  --blue:#86AEEA; --magenta:#E38BBA; --red:#EE7070; --ochre:#EDBA55;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="paper"]){
    color-scheme:dark;
    --school:var(--school-dim,#8EA2D8); --on-school:#1D1C19;
    --paper:#2A2723; --paper-now:#35312B; --sheet:#312D28; --field:#221F1C;
    --ink:#EDE4D0; --ink-2:#BDB29C; --rule:#5C5448; --tick:#A99E88;
    --blue:#86AEEA; --magenta:#E38BBA; --red:#EE7070; --ochre:#EDBA55;
  }
}

*{box-sizing:border-box}
html{background:var(--paper)}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.5;-webkit-font-smoothing:antialiased;font-variant-numeric:tabular-nums}
::selection{background:var(--school-accent);color:#1D1C19}
a{color:var(--blue)}
button{font:inherit;color:inherit;cursor:pointer}
:focus-visible{outline:2px solid var(--blue);outline-offset:2px}
.num,code{font-family:var(--mono)}
.skip{position:absolute;left:-9999px;top:8px;z-index:50;background:var(--ink);color:var(--paper);padding:10px 14px;font-weight:850;text-decoration:none}
.skip:focus{left:8px}
[hidden]{display:none!important}

/* Masthead */
.mast{display:grid;grid-template-columns:auto 1fr auto auto;gap:24px;align-items:center;padding:12px 24px;border-bottom:3px double var(--ink);background:var(--paper)}
.brand{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none}
.brand img{height:44px;width:auto}
.brand b{display:block;font-weight:850;font-stretch:86%;text-transform:uppercase;font-size:22px;line-height:1;letter-spacing:.01em}
.brand small{display:block;font-size:12px;font-weight:650;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-2);margin-top:4px}
.family{justify-self:center;display:flex;border:1.5px solid var(--ink)}
.family a{padding:7px 15px;font-weight:800;font-size:13px;letter-spacing:.07em;text-transform:uppercase;color:var(--ink);text-decoration:none;border-right:1.5px solid var(--ink)}
.family a:last-child{border-right:0}
.family a:hover{background:var(--paper-now)}
.family a[aria-current]{background:var(--ink);color:var(--paper)}
.theme{display:flex;gap:0;border:1.5px solid var(--ink)}
.theme button{background:var(--sheet);border:0;border-right:1.5px solid var(--ink);padding:5px 9px;font-size:12px;font-weight:800;letter-spacing:.07em;text-transform:uppercase}
.theme button:last-child{border-right:0}
.theme button[aria-pressed="true"]{background:var(--ink);color:var(--paper)}

/* Legend drawer: beside the question, the way the supplement sits beside you at the test */
.legend-btn{padding:6px 12px;font-size:13px}
.legend-btn[aria-expanded="true"]{background:var(--ink);color:var(--paper)}
.drawer{position:sticky;top:0;height:100vh;align-self:start;background:var(--paper);border-left:3px double var(--ink);display:flex;flex-direction:column;min-width:0}
.drawer-head{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:10px 12px;border-bottom:1.5px solid var(--ink)}
.drawer-head .btn{padding:6px 10px;font-size:12.5px}
.drawer-head select{font:inherit;font-size:14px;border:1.5px solid var(--ink);background:var(--field);color:var(--ink);padding:5px}
.drawer-body{flex:1;min-height:0;padding:10px 12px 0}
.drawer-body .viewer{height:100%}
.drawer-cap{padding:6px 12px 10px;margin:0}
body.legend-open .shell{grid-template-columns:var(--rail) minmax(0,1fr) min(640px,40vw)}
/* Room for the question beside the legend: the course rail steps aside while it's open. */
@media (max-width:1700px){body.legend-open .shell{grid-template-columns:minmax(0,1fr) min(640px,40vw)}body.legend-open .rail{display:none}}
@media (max-width:1300px){body.legend-open .q{grid-template-columns:1fr}}

/* Shell */
.shell{display:grid;grid-template-columns:var(--rail) 1fr;min-height:calc(100vh - 72px)}
.rail{border-right:1.5px solid var(--ink);padding:18px 0;position:sticky;top:0;align-self:start;max-height:100vh;overflow:auto}
.rail h2{font-size:12px;font-weight:850;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-2);margin:14px 20px 6px}
.rail a{display:flex;gap:10px;align-items:flex-start;padding:7px 20px;color:var(--ink);text-decoration:none;font-weight:650;font-size:15px;line-height:1.3}
.rail a:hover{background:var(--paper-now)}
.rail a[aria-current]{background:var(--school);color:var(--on-school)}
.rail a small{display:block;font-weight:500;font-size:12.5px;color:inherit;opacity:.8}
.box{flex:none;width:17px;height:17px;margin-top:1px;border:1.5px solid currentColor;position:relative}
.box.started{background:linear-gradient(135deg,currentColor 50%,transparent 50%)}
.box.done{background:currentColor}
.box.done::after{content:"";position:absolute;left:4px;top:0px;width:5px;height:10px;border:solid var(--paper);border-width:0 2px 2px 0;transform:rotate(45deg)}
.rail a[aria-current] .box.done::after{border-color:var(--school)}
main{min-width:0}
.band{padding:32px 44px 44px;border-bottom:3px double var(--ink)}
.band:last-child{border-bottom:0}
.display{font-weight:850;font-size:clamp(34px,4.4vw,52px);line-height:.95;font-stretch:86%;text-transform:uppercase;margin:0 0 14px;letter-spacing:-.005em}
.headline{font-weight:850;font-size:clamp(24px,2.6vw,32px);line-height:1;font-stretch:92%;text-transform:uppercase;margin:0 0 12px}
.title{font-weight:850;font-size:20px;line-height:1.1;font-stretch:92%;text-transform:uppercase;margin:0 0 8px}
.objective{font-size:19px;line-height:1.45;max-width:62ch;margin:0 0 18px}
.prose{max-width:68ch}
.prose p{margin:0 0 12px}
.dim{color:var(--ink-2)}
.label{font-size:12.5px;font-weight:850;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-2)}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:8px;border:1.5px solid var(--ink);background:var(--ink);color:var(--paper);padding:9px 14px;font-weight:850;font-size:14px;letter-spacing:.07em;text-transform:uppercase;text-decoration:none}
.btn:hover{filter:brightness(1.15)}
.btn.ghost{background:var(--sheet);color:var(--ink)}
.btn.ghost:hover{background:var(--paper-now);filter:none}
.btn[disabled]{opacity:.45;cursor:default}
.row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}

/* Stamps */
.stamp{display:inline-flex;align-items:center;gap:5px;font-size:12px;font-weight:800;font-stretch:85%;letter-spacing:.08em;text-transform:uppercase;padding:2px 7px;border:1.5px solid currentColor;line-height:1.35;white-space:nowrap;color:var(--ink);background:var(--paper)}
.stamp.out{color:var(--red);border:4px double currentColor;padding:0 6px;background-image:repeating-linear-gradient(135deg,color-mix(in srgb,currentColor 20%,transparent) 0 1.2px,transparent 1.2px 4px)}
.stamp.unk{color:var(--ink-2);border-style:dashed}
.stamp.info{color:var(--ink-2)}

/* Cards and grids */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px}
.card{border:1.5px solid var(--ink);background:var(--sheet);padding:16px 18px;display:flex;flex-direction:column;gap:8px;color:var(--ink);text-decoration:none}
a.card:hover{background:var(--paper-now)}
.card .title{margin:0}
.card p{margin:0;font-size:14.5px;color:var(--ink-2)}
.card .meter{margin-top:auto}
.meter{height:8px;border:1.5px solid var(--ink);background:var(--paper)}
.meter i{display:block;height:100%;background:var(--ink)}
.next{border:2px solid var(--ink);background:var(--sheet);padding:18px 20px;display:grid;grid-template-columns:1fr auto;gap:14px;align-items:center;max-width:860px}
.next p{margin:4px 0 0;color:var(--ink-2)}

/* Figure viewer (zoom and pan) */
.viewer{position:relative;border:1.5px solid var(--ink);background:var(--paper-now);overflow:hidden;touch-action:none;user-select:none}
.viewer .stage{position:absolute;left:0;top:0;transform-origin:0 0}
.viewer .stage img{display:block;image-rendering:auto}
.viewer svg.overlay{position:absolute;left:0;top:0;overflow:visible;pointer-events:none}
.viewer .zoom{position:absolute;right:8px;top:8px;display:flex;flex-direction:column;border:1.5px solid var(--ink);background:var(--sheet);z-index:2}
.viewer .zoom button{width:34px;height:32px;border:0;border-bottom:1.5px solid var(--ink);background:none;font-weight:850;font-size:17px}
.viewer .zoom button:last-child{border-bottom:0;font-size:12px}
.viewer .zoom button:hover{background:var(--paper-now)}
.fig-caption{font-family:var(--mono);font-size:12.5px;color:var(--ink-2);padding:6px 0 0}
.ring{fill:none;stroke:#F2A900;stroke-width:5;stroke-linecap:square}
.ring-back{fill:none;stroke:#1D1C19;stroke-width:9;stroke-linecap:square}
.pin circle{fill:var(--ink);stroke:var(--paper);stroke-width:3}
.pin text{fill:var(--paper);font:850 15px var(--sans);text-anchor:middle;dominant-baseline:central}

/* Question */
.q{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(300px,1fr);gap:26px;align-items:start}
.q .viewer{aspect-ratio:720/500;width:100%}
.q-meta{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:10px}
.stem{font-weight:800;font-size:18px;line-height:1.35;margin:0 0 14px}
.choices{display:flex;flex-direction:column;gap:8px;margin:0 0 14px;padding:0;list-style:none}
.choice{display:grid;grid-template-columns:28px 1fr;gap:10px;align-items:start;width:100%;text-align:left;border:1.5px solid var(--ink);background:var(--sheet);padding:10px 12px;font-size:16px;line-height:1.35}
.choice:hover:not([disabled]){background:var(--paper-now)}
.choice b{font-family:var(--mono);font-weight:600}
.choice[aria-pressed="true"]{box-shadow:inset 0 0 0 1.5px var(--ink);background:var(--paper-now)}
.choice.right{border-width:3px;padding:8.5px 10.5px}
.choice.wrong{color:var(--red);border:4px double var(--red);padding:7px 9px}
.choice[disabled]{cursor:default}
.conf{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.conf button{border:2px solid var(--ink);background:var(--sheet);padding:9px 6px;font-weight:850;font-size:14px;letter-spacing:.06em;text-transform:uppercase}
.conf button:hover:not([disabled]){box-shadow:inset 0 0 0 1.5px var(--ink)}
.conf button[disabled]{opacity:.4;cursor:default}
.conf-label{margin:4px 0 6px}
.feedback{border-top:1.5px solid var(--ink);margin-top:14px;padding-top:14px}
.feedback p{margin:0 0 10px}
.feedback .why{border-left:3px solid var(--ink);padding:2px 0 2px 12px;margin:0 0 10px}
.feedback .why.wrong{border-left:4px double var(--red)}
.qcount{font-family:var(--mono);font-size:13px;color:var(--ink-2)}

/* Lessons */
.lesson-fig{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(260px,1fr);gap:24px;align-items:start;margin:18px 0}
.lesson-fig .viewer{width:100%}
.keylist{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px}
.keylist li{display:grid;grid-template-columns:30px 1fr;gap:10px;align-items:start}
.keylist .k{width:28px;height:28px;border-radius:50%;background:var(--ink);color:var(--paper);display:grid;place-items:center;font-weight:850;font-size:14px}
.stack{border:1.5px solid var(--ink);background:var(--sheet)}
.stack div{display:grid;grid-template-columns:70px 1fr;gap:12px;padding:10px 12px;border-bottom:1px solid var(--rule)}
.stack div:last-child{border-bottom:0}
.stack .cls{font-weight:850;font-size:20px;font-stretch:90%}
.stack .rng{font-family:var(--mono);font-size:14px}
.stack p{margin:2px 0 0;font-size:14px;color:var(--ink-2)}
.block{display:flex;flex-wrap:wrap;gap:6px;font-family:var(--mono);font-size:19px;font-weight:600;margin:10px 0}
.block button{border:1.5px solid var(--ink);background:var(--sheet);padding:3px 8px;font-family:var(--mono);font-weight:600}
.block button[aria-pressed="true"]{background:var(--ink);color:var(--paper)}
.block .twr{color:var(--blue)}
.block .ntwr{color:var(--magenta)}
.explain{min-height:3.2em;border:1.5px dashed var(--ink-2);padding:10px 12px;max-width:68ch;background:var(--sheet)}
.cantell{border:1.5px dashed var(--ink-2);padding:14px 16px;max-width:860px}
.cantell ul{margin:6px 0 0;padding-left:20px}
.linestyles{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:12px;margin:14px 0}
.linestyles div{border:1.5px solid var(--ink);background:var(--sheet);padding:12px}
.linestyles svg{display:block;margin-bottom:8px}
.figs{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin:16px 0}
.figs .viewer{aspect-ratio:720/500;width:100%}
.figs h3{margin:0 0 6px}

/* Supplement */
.supp{display:grid;grid-template-columns:240px minmax(0,1fr);gap:20px}
.supp nav{display:flex;flex-direction:column;border:1.5px solid var(--ink);max-height:72vh;overflow:auto}
.supp nav button{text-align:left;border:0;border-bottom:1px solid var(--rule);background:var(--sheet);padding:8px 10px;font-size:14px}
.supp nav button[aria-current="true"]{background:var(--ink);color:var(--paper)}
.supp .viewer{height:72vh}

/* Results */
table.res{border-collapse:collapse;width:100%;max-width:860px}
table.res th,table.res td{border-bottom:1px solid var(--rule);padding:8px 10px;text-align:left;font-size:15px}
table.res th{font-size:12.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-2)}

@media (max-width:1180px){:root{--rail:240px}.band{padding:28px 30px 30px}.q{grid-template-columns:1fr}.lesson-fig{grid-template-columns:1fr}}
@media (max-width:900px){
  .drawer{position:fixed;inset:0;height:auto;z-index:40;border-left:0}
  body.legend-open .shell{grid-template-columns:1fr}
  .mast{grid-template-columns:1fr auto auto}
  .shell{grid-template-columns:1fr}
  .rail{position:static;border-right:0;border-bottom:1.5px solid var(--ink);max-height:none;display:flex;overflow:auto;padding:6px 0}
  .rail h2{display:none}
  .rail a{white-space:nowrap}
  .rail a small{display:none}
  .mast{grid-template-columns:1fr auto}
  .family{grid-column:1/-1;justify-self:stretch}
  .family a{flex:1;text-align:center;padding:7px 6px}
  .band{padding:22px 16px}
  .figs,.supp{grid-template-columns:1fr}
  .supp nav{flex-direction:row;max-height:none;overflow:auto}
  .supp nav button{white-space:nowrap;border-bottom:0;border-right:1px solid var(--rule)}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}
@media print{.mast .family,.theme,.rail,.btn,.conf{display:none!important}.shell{display:block}.band{border:0;padding:12px 0}}