/* Field Station shared styles: tokens + components. See docs/DESIGN.md. */
@import url('https://fonts.googleapis.com/css2?family=Zilla+Slab:wght@500;600;700&family=Public+Sans:wght@400;500;600;700&family=IBM+Plex+Mono:wght@500;600&display=swap');

:root{
  --bg:#FBF9F5; --paper:#FFFFFF; --paper-alt:#F2EDE4; --line:#DCD2C2;
  --ink:#1E1A16; --ink-2:#3F3731; --muted:#5B5048;
  --slate:#2F3E46; --rust:#9A4A24; --rust-deep:#6E3318; --moss:#3E6B57; --ochre:#8A5A12;
  --good-bg:#E3ECE6; --good-ink:#1F4234; --bad-bg:#F4E3D8; --bad-ink:#5C2A12;
  --on-slate:#FBF9F5; --on-slate-muted:#D9D2C6; --highlight:#F0C48E;
  --on-slate-hi:#F0C48E; --tile:#ECE4D6; --rule:#ECE4D6; --dash:#B8A98F;
  --tint-rust-bg:#F4E3D8; --tint-rust-ink:#7A3A1B; --tint-rust-line:#C98B6B;
  --tint-moss-bg:#E3ECE6; --tint-moss-ink:#2E5444; --tint-moss-line:#3E6B57;
  --tint-ochre-bg:#F6EAD3; --tint-ochre-ink:#6B4510; --tint-ochre-line:#C39A55;
  --tint-slate-bg:#E4E9EB; --tint-slate-ink:#2F3E46; --tint-slate-line:#8FA3AC;
  --f-display:'Zilla Slab', Georgia, serif;
  --f-body:'Public Sans', system-ui, sans-serif;
  --f-mono:'IBM Plex Mono', ui-monospace, monospace;
  --r-card:16px; --r-ctl:10px;
  --shadow:0 1px 2px rgba(40,28,15,.05), 0 10px 26px rgba(40,28,15,.07);
  --w-read:920px; --w-tool:1280px;
  color-scheme:light;
}
@media (prefers-color-scheme: dark){ :root:not([data-theme="light"]){
  --bg:#15130F; --paper:#1F1C17; --paper-alt:#28241E; --line:#3A342B;
  --ink:#F1ECE3; --ink-2:#D8D0C3; --muted:#A99F92;
  --slate:#9FB6C1; --rust:#E08A5E; --rust-deep:#F0A57F; --moss:#7FB89C; --ochre:#D9A15B;
  --good-bg:#1E3329; --good-ink:#BFE3CF; --bad-bg:#3A2418; --bad-ink:#F3C9B2;
  --on-slate:#15130F; --on-slate-muted:#2F3E46; --highlight:#F0C48E;
  --on-slate-hi:#5C2A12; --tile:#28241E; --rule:#2E2922; --dash:#5A5145;
  --tint-rust-bg:#3A2418; --tint-rust-ink:#F3C9B2; --tint-rust-line:#8A5236;
  --tint-moss-bg:#1E3329; --tint-moss-ink:#BFE3CF; --tint-moss-line:#4F8A6E;
  --tint-ochre-bg:#352A18; --tint-ochre-ink:#F0D3A6; --tint-ochre-line:#8C6A33;
  --tint-slate-bg:#1F2A30; --tint-slate-ink:#C9D8DF; --tint-slate-line:#55707C;
  --shadow:0 1px 2px rgba(0,0,0,.35), 0 12px 30px rgba(0,0,0,.4); color-scheme:dark; } }
:root[data-theme="dark"]{
  --bg:#15130F; --paper:#1F1C17; --paper-alt:#28241E; --line:#3A342B;
  --ink:#F1ECE3; --ink-2:#D8D0C3; --muted:#A99F92;
  --slate:#9FB6C1; --rust:#E08A5E; --rust-deep:#F0A57F; --moss:#7FB89C; --ochre:#D9A15B;
  --good-bg:#1E3329; --good-ink:#BFE3CF; --bad-bg:#3A2418; --bad-ink:#F3C9B2;
  --on-slate:#15130F; --on-slate-muted:#2F3E46; --highlight:#F0C48E;
  --on-slate-hi:#5C2A12; --tile:#28241E; --rule:#2E2922; --dash:#5A5145;
  --tint-rust-bg:#3A2418; --tint-rust-ink:#F3C9B2; --tint-rust-line:#8A5236;
  --tint-moss-bg:#1E3329; --tint-moss-ink:#BFE3CF; --tint-moss-line:#4F8A6E;
  --tint-ochre-bg:#352A18; --tint-ochre-ink:#F0D3A6; --tint-ochre-line:#8C6A33;
  --tint-slate-bg:#1F2A30; --tint-slate-ink:#C9D8DF; --tint-slate-line:#55707C;
  --shadow:0 1px 2px rgba(0,0,0,.35), 0 12px 30px rgba(0,0,0,.4); color-scheme:dark; }

/* ---------- base ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
/* Guide and drill colors (home page, guide tabs). Text-safe on --paper in both themes. */
:root{ --c-g1:#8A5A12; --c-g2:#1F6E73; --c-g3:#B03A22; --c-g4:#2C5F8E; --c-g5:#6B3FA0; }
@media (prefers-color-scheme: dark){ :root:not([data-theme="light"]){ --c-g1:#D9A15B; --c-g2:#6CC3C7; --c-g3:#F2876A; --c-g4:#8DB8E6; --c-g5:#C2A2EC; } }
:root[data-theme="dark"]{ --c-g1:#D9A15B; --c-g2:#6CC3C7; --c-g3:#F2876A; --c-g4:#8DB8E6; --c-g5:#C2A2EC; }

body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--f-body);font-size:16px;line-height:1.55;min-height:100vh;display:flex;flex-direction:column}
a{color:var(--rust)} a:hover{color:var(--rust-deep)}
img,svg{max-width:100%}
h1,h2,h3,h4{font-family:var(--f-display);color:var(--slate);line-height:1.15;margin:0}
h1{font-size:52px;font-weight:700}
h2{font-size:30px;font-weight:700}
h3{font-size:22px;font-weight:600}
p{margin:0 0 1em}
sub,sup{font-size:.72em;line-height:0}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--rust);outline-offset:3px;border-radius:4px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip{position:absolute;left:12px;top:-60px;background:var(--paper);padding:10px 14px;border-radius:var(--r-ctl);border:1px solid var(--line);z-index:100}
.skip:focus{top:12px}
.mono{font-family:var(--f-mono)}
.formula{font-family:var(--f-mono);font-weight:500}
.muted{color:var(--muted)}
[hidden]{display:none !important}

/* ---------- layout ---------- */
.wrap{width:100%;max-width:calc(var(--w-read) + 32px);margin:0 auto;padding:0 16px}
.wrap-tool{width:100%;max-width:var(--w-tool);margin:0 auto;padding:0 16px}
@media (min-width:720px){ .wrap-tool{padding:0 40px} }
@media (min-width:1100px){ .wrap-tool{padding:0 64px} }
main{flex:1}
.stack>*+*{margin-top:var(--gap,16px)}
.grid-2{display:grid;gap:16px;grid-template-columns:minmax(0,1fr)}
.grid-3{display:grid;gap:14px;grid-template-columns:minmax(0,1fr)}
@media (min-width:720px){ .grid-2{grid-template-columns:repeat(2,minmax(0,1fr))} .grid-3{grid-template-columns:repeat(3,minmax(0,1fr))} }

/* ---------- site header / footer ---------- */
.fs-head{padding:20px 0 0}
/* Header: one back link and the account button, as on Detective's Desk */
.backnav{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;font-size:13px}
.backnav .back{display:inline-flex;align-items:center;gap:6px;min-height:44px;color:var(--muted);font-weight:600;text-decoration:none}
.backnav .back:hover{color:var(--rust)}
.head-end{display:flex;gap:8px;align-items:center;margin-left:auto}
.acct{position:relative;display:inline-flex;align-items:center;font-size:13px;line-height:1.6}
.acct:empty{display:none}
.acct-btn{display:inline-flex;align-items:center;gap:7px;max-width:190px;min-height:32px;padding:2px 9px 2px 2px;border:1px solid var(--line);border-radius:999px;background:var(--paper);color:var(--ink);font:inherit;font-weight:600;cursor:pointer}
.acct-btn:hover,.acct-btn[aria-expanded="true"]{border-color:var(--rust)}
.acct-av{flex:none;width:22px;height:22px;border-radius:50%;background:var(--rust);color:var(--paper);display:inline-flex;align-items:center;justify-content:center;font-size:11.5px;font-weight:700;text-transform:uppercase}
.acct-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0}
.acct-caret{flex:none;font-size:10px;color:var(--muted)}
.acct-guest{flex:none;font-size:10.5px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;padding:0 6px;border-radius:999px;border:1px solid var(--line);color:var(--muted)}
.acct-in{display:inline-flex;align-items:center;min-height:32px;padding:2px 12px;border:1px solid var(--line);border-radius:999px;background:var(--paper);color:var(--rust);font-weight:600;text-decoration:none}
.acct-in:hover{border-color:var(--rust)}
.acct-menu{position:absolute;top:calc(100% + 6px);right:0;z-index:60;min-width:210px;max-width:calc(100vw - 32px);padding:6px;background:var(--paper);border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);text-align:left}
.acct-menu[hidden]{display:none}
.acct-head{padding:6px 10px 8px;margin-bottom:4px;border-bottom:1px solid var(--line)}
.acct-head b{display:block;color:var(--ink);font-size:14px;overflow-wrap:anywhere}
.acct-head span{display:block;color:var(--muted);font-size:12px;overflow-wrap:anywhere}
.acct-menu a{display:block;padding:7px 10px;border-radius:8px;color:var(--ink);font-weight:600;text-decoration:none}
.acct-menu a:hover{background:var(--paper-alt)}
.acct-sep{height:1px;margin:4px 0;background:var(--line)}
@media (max-width:420px){ .acct-btn{max-width:140px} }
[tabindex="-1"]:focus:not(:focus-visible){outline:none}
h1[tabindex="-1"]:focus,h2[tabindex="-1"]:focus,h3[tabindex="-1"]:focus{outline:none}
.fs-foot{margin-top:46px;padding:0 0 40px}
.fs-foot .inner{border-top:1px solid var(--line);padding-top:20px;font-size:13px;color:var(--muted);text-align:center}
.fs-foot p{margin:0 0 4px}.fs-foot .small{font-size:12px}
.fs-foot a{color:inherit;text-decoration:underline;text-underline-offset:2px}.fs-foot a:hover{color:var(--rust)}

/* ---------- type helpers ---------- */
.lede{font-size:18px;line-height:1.55;color:var(--muted);max-width:680px}
.kicker{font-family:var(--f-mono);font-size:11px;letter-spacing:.09em;text-transform:uppercase;font-weight:600;color:var(--ochre)}
.sec-kicker{font-family:var(--f-mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;font-weight:600;color:var(--ochre);margin:0 0 6px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--f-mono);font-size:12px;letter-spacing:.11em;text-transform:uppercase;font-weight:600;color:var(--moss);background:var(--tile);border:1px solid var(--line);padding:6px 14px;border-radius:999px}
.label{display:flex;align-items:center;gap:10px;font-family:var(--f-mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;font-weight:600;color:var(--muted);margin:0 0 16px}
.label .dot{width:8px;height:8px;border-radius:50%;flex:none;background:var(--muted)}
.dot-guides{background:var(--moss) !important}.dot-ref{background:var(--slate) !important}.dot-stations{background:var(--rust) !important}.dot-drills{background:var(--ochre) !important}

/* ---------- panels, cards ---------- */
.panel{background:var(--paper);border:1px solid var(--line);border-radius:var(--r-card);padding:24px}
.panel.tight{padding:18px 20px}
.panel-title{font-family:var(--f-mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;font-weight:600;color:var(--moss);margin:0 0 6px}
.panel-title.rust{color:var(--rust)}
a.card{display:flex;gap:18px;align-items:center;background:var(--paper);border:1px solid var(--line);border-radius:var(--r-card);padding:22px 24px;text-decoration:none;color:var(--ink);box-shadow:var(--shadow)}
a.card:hover{border-color:var(--rust);color:var(--ink)}
.card .mark{flex:none;width:52px;height:52px;border-radius:12px;display:flex;align-items:center;justify-content:center;background:var(--tile);border:1px solid var(--line);color:var(--slate)}
.card .body{flex:1;min-width:0}
.card .kicker{margin-bottom:4px;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.card h3{font-size:22px;font-weight:600;margin:0 0 5px}
.card p{margin:0;font-size:14.5px;line-height:1.5;color:var(--muted)}
.card .go{flex:none;color:var(--rust)}
@media (max-width:480px){ a.card{padding:16px;gap:14px} .card .mark{width:42px;height:42px;border-radius:10px} .card h3{font-size:19px} }

.fact{background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:18px 20px}
.fact .num{font-family:var(--f-display);font-size:30px;font-weight:700;color:var(--slate)}
.fact .txt{font-size:14px;line-height:1.45;color:var(--muted)}
.fact.slate{background:var(--slate);border-color:var(--slate)}
.fact.slate .num{color:var(--on-slate)} .fact.slate .txt{color:var(--on-slate-muted)}

/* ---------- decider bar ---------- */
.decider{background:var(--slate);color:var(--on-slate);border-radius:14px;padding:18px 22px;display:flex;gap:18px;align-items:center}
.decider .k{font-family:var(--f-mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--on-slate-muted);width:110px;flex:none}
.decider .v{font-size:17px;line-height:1.5}
.decider strong{color:var(--on-slate-hi)}
@media (max-width:560px){ .decider{flex-direction:column;align-items:flex-start;gap:6px} .decider .k{width:auto} }

/* ---------- property table ---------- */
.props{padding:6px 24px 10px}
.prow{display:grid;grid-template-columns:150px minmax(0,1fr);gap:16px;padding:11px 0;border-bottom:1px solid var(--rule);font-size:15px}
.prow:last-child{border-bottom:none}
.prow .k{font-family:var(--f-mono);font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);padding-top:2px}
@media (max-width:480px){ .props{padding:4px 16px 8px} .prow{grid-template-columns:1fr;gap:2px} }

/* ---------- badges, pills, chips ---------- */
.badge{display:inline-flex;align-items:center;font-family:var(--f-mono);font-size:12px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;padding:4px 10px;border-radius:999px;border:1px solid}
.badge.cls{background:var(--tint-rust-bg);color:var(--tint-rust-ink);border-color:var(--tint-rust-line)}
.badge.reg{background:var(--tint-moss-bg);color:var(--tint-moss-ink);border-color:var(--tint-moss-line)}
.badge.sn{background:var(--tint-ochre-bg);color:var(--tint-ochre-ink);border-color:var(--tint-ochre-line)}
.badge.kind{background:var(--tint-slate-bg);color:var(--tint-slate-ink);border-color:var(--tint-slate-line)}
.pill{font-family:var(--f-mono);font-size:10px;font-weight:600;letter-spacing:.04em;text-transform:uppercase;padding:2px 8px;border-radius:999px;border:1px solid}
.chip{font-family:var(--f-mono);font-size:12px;font-weight:600;padding:8px 14px;border-radius:999px;border:1px solid var(--line);background:var(--paper);color:var(--ink-2);min-height:44px;display:inline-flex;align-items:center;gap:6px;cursor:pointer}
.chip:hover{border-color:var(--rust)}
.chip[aria-pressed="true"]{background:var(--slate);color:var(--on-slate);border-color:var(--slate)}
.chips{display:flex;gap:8px;flex-wrap:wrap}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font:600 15px var(--f-body);background:var(--rust);color:#FFFFFF;border:none;border-radius:var(--r-ctl);padding:12px 20px;min-height:44px;cursor:pointer;text-decoration:none}
.btn:hover{background:var(--rust-deep);color:#FFFFFF}
:root[data-theme="dark"] .btn:not(.ghost),:root[data-theme="dark"] .btn:not(.ghost):hover{color:#15130F}
@media (prefers-color-scheme: dark){ :root:not([data-theme="light"]) .btn:not(.ghost),:root:not([data-theme="light"]) .btn:not(.ghost):hover{color:#15130F} }
.btn.ghost{background:var(--paper);color:var(--rust);border:1px solid var(--line)}
.btn.ghost:hover{border-color:var(--rust);background:var(--paper);color:var(--rust-deep)}
.btn[disabled]{opacity:.5;cursor:not-allowed}
.navbtn{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;text-decoration:none;padding:10px 14px;min-height:44px;border:1px solid var(--line);border-radius:var(--r-ctl);background:var(--paper)}
.navbtn:hover{border-color:var(--rust)}

/* ---------- inputs ---------- */
.input{font:500 16px var(--f-body);color:var(--ink);background:var(--paper);border:1px solid var(--line);border-radius:var(--r-ctl);padding:10px 14px;min-height:44px;width:100%}
.input:focus-visible{outline:2px solid var(--rust);outline-offset:2px}
.input::placeholder{color:var(--muted)}

/* ---------- check yourself / results ---------- */
.check{background:var(--paper);border:2px solid var(--slate);border-radius:var(--r-card);padding:28px}
.check .sec-kicker{color:var(--moss)}
.check .q{font-size:18px;line-height:1.55;margin:0 0 18px;font-weight:600;max-width:720px}
.result{border-radius:12px;padding:16px 18px;font-size:16px;line-height:1.55}
.result.good{background:var(--good-bg);color:var(--good-ink)}
.result.bad{background:var(--bad-bg);color:var(--bad-ink)}
.result.info{background:var(--paper-alt);color:var(--ink)}
@media (max-width:480px){ .check{padding:20px 18px} }

/* ---------- quiz engine ---------- */
.quiz .qitem+.qitem{margin-top:22px}
.quiz .qprompt{font-weight:600;font-size:17px;line-height:1.5;margin:0 0 12px}
.quiz .qmeta{font-family:var(--f-mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:6px}
.choices{display:grid;gap:10px;grid-template-columns:minmax(0,1fr)}
@media (min-width:640px){ .choices.two{grid-template-columns:repeat(2,minmax(0,1fr))} }
.choice{font:600 16px var(--f-body);padding:14px 18px;min-height:56px;border-radius:12px;cursor:pointer;text-align:left;background:var(--paper);color:var(--ink);border:2px solid var(--line);display:flex;align-items:center;gap:10px}
.choice:hover:not([disabled]){border-color:var(--rust)}
.choice[aria-pressed="true"]{border-color:var(--slate)}
.choice.correct{background:var(--good-bg);color:var(--good-ink);border-color:var(--moss)}
.choice.wrong{background:var(--bad-bg);color:var(--bad-ink);border-color:var(--rust)}
.choice[disabled]{cursor:default}
.choice .mk{margin-left:auto;font-family:var(--f-mono);font-size:13px}
.qexplain{margin-top:12px}
.qactions{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px;align-items:center}
.match-row{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:10px;align-items:center;padding:6px 0}
.order-list{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.order-list li{display:flex;align-items:center;gap:8px;background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:6px 8px 6px 14px}
.order-list li span{flex:1}
.iconbtn{display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;border:1px solid var(--line);border-radius:var(--r-ctl);background:var(--paper);cursor:pointer;color:var(--ink-2)}
.iconbtn:hover:not([disabled]){border-color:var(--rust)}
.iconbtn[disabled]{opacity:.4;cursor:default}
select.input{appearance:auto}

/* ---------- tool top bar ---------- */
.toolbar{background:var(--slate);color:var(--on-slate)}
.toolbar .wrap-tool{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:12px;padding-bottom:12px;flex-wrap:wrap}
.toolbar a.back{color:var(--on-slate-hi);font-size:14px;font-weight:600;text-decoration:none;min-height:44px;display:inline-flex;align-items:center}
.toolbar .name{font-family:var(--f-display);font-size:22px;font-weight:700}
.toolbar .lvl{font-family:var(--f-mono);font-size:11px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;border:1px solid var(--tint-slate-line);color:var(--on-slate-muted);padding:3px 9px;border-radius:999px}
.stats{display:flex;gap:28px}
.stat{display:flex;flex-direction:column;align-items:flex-end}
.stat .k{font-family:var(--f-mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--on-slate-muted)}
.stat .v{font-family:var(--f-display);font-size:24px;font-weight:700}

/* ---------- clue tiles ---------- */
.clue{background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:18px 20px;display:flex;flex-direction:column;gap:6px}
.clue .k{font-family:var(--f-mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;font-weight:600;color:var(--muted)}
.clue .v{font-family:var(--f-display);font-size:24px;font-weight:600;color:var(--slate)}
.clue-hidden{border:2px dashed var(--dash);background:var(--paper-alt);border-radius:14px;padding:18px 20px;text-align:left;cursor:pointer;min-height:44px}
.clue-hidden .k{display:block;font-family:var(--f-mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;font-weight:600;color:var(--muted)}
.clue-hidden .v{display:block;font-size:15px;font-weight:600;color:var(--rust);margin-top:6px}

/* ---------- rotation dots ---------- */
.rot{display:flex;gap:8px;flex-wrap:wrap}
.rot span{width:32px;height:32px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;font:600 13px var(--f-mono);border:2px solid var(--line);color:var(--muted)}
.rot .done{background:var(--moss);border-color:var(--moss);color:var(--bg)}
.rot .cur{background:var(--rust);border-color:var(--rust);color:var(--bg);box-shadow:0 0 0 4px var(--tint-rust-bg)}

/* ---------- photo placeholder, swatches ---------- */
.ph{border-radius:var(--r-card);border:2px dashed var(--dash);background:var(--tile);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;color:var(--muted);text-align:center;padding:20px}
.swatch{height:56px;border-radius:8px;border:1px solid var(--line)}
.streak-plate{height:56px;border-radius:8px;background:#F5F1EA;border:1px solid var(--line);display:flex;align-items:center;padding:0 10px}
.streak-plate i{display:block;height:10px;width:100%;border-radius:5px}

/* ---------- tables ---------- */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r-card);background:var(--paper)}
table.tbl{border-collapse:collapse;width:100%;font-size:14.5px}
.tbl th,.tbl td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--rule);vertical-align:top}
.tbl th{font-family:var(--f-mono);font-size:11.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);font-weight:600;background:var(--paper-alt)}
.tbl tr:last-child td{border-bottom:none}

/* ---------- motion ---------- */
@media (prefers-reduced-motion: no-preference){
  a.card,.chip,.choice,.btn,.navbtn,.iconbtn{transition:border-color .15s, background-color .15s, color .15s}
}
@media (prefers-reduced-motion: reduce){ *,*::before,*::after{transition:none !important;animation:none !important;scroll-behavior:auto !important} }

/* ---------- print ---------- */
@media print{
  :root{--bg:#fff;--paper:#fff;--shadow:none}
  .fs-head,.fs-foot,.skip,.no-print{display:none !important}
  a{color:inherit;text-decoration:none}
}

/* ---------- study guides ---------- */
.guide-layout{display:flex;gap:48px;align-items:flex-start;padding-top:24px}
.guide-main{flex:1;min-width:0;display:flex;flex-direction:column;gap:56px}
.toc{width:230px;flex:none;position:sticky;top:16px;max-height:calc(100vh - 32px);overflow:auto;display:flex;flex-direction:column;gap:2px;padding-top:8px}
.toc .t{font-family:var(--f-mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;font-weight:600;color:var(--muted);padding:0 12px 8px}
.toc a{display:flex;gap:8px;align-items:center;padding:8px 12px;border-radius:8px;font-size:14px;color:var(--ink-2);text-decoration:none;min-height:36px}
.toc a:hover{background:var(--tile);color:var(--ink)}
.toc a[aria-current="true"]{background:var(--tile);color:var(--ink);font-weight:600}
.toc a .ok{margin-left:auto;color:var(--moss);font-size:13px}
.toc-progress{margin:18px 12px 0;padding:14px;border-radius:12px;background:var(--slate);color:var(--on-slate)}
.toc-progress .k{font-family:var(--f-mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--on-slate-muted)}
.toc-progress .v{font-family:var(--f-display);font-size:26px;font-weight:700;margin:4px 0 8px}
.toc-progress .bar{height:6px;border-radius:3px;background:rgba(127,127,127,.35)}
.toc-progress .bar i{display:block;height:6px;border-radius:3px;background:var(--ochre);width:0}
.toc-mobile{display:none}
@media (max-width:1000px){
  .guide-layout{display:block}
  .toc{display:none}
  .toc-mobile{display:block;margin:16px 0 0;background:var(--paper);border:1px solid var(--line);border-radius:12px}
  .toc-mobile summary{cursor:pointer;padding:12px 16px;min-height:44px;font-weight:600;display:flex;justify-content:space-between;gap:10px;align-items:center}
  .toc-mobile nav{padding:0 8px 8px;display:flex;flex-direction:column}
  .toc-mobile nav a{padding:10px 8px;min-height:44px;display:flex;align-items:center;gap:8px;text-decoration:none;color:var(--ink-2);border-radius:8px}
  .guide-main{gap:44px;margin-top:28px}
}
.guide-head h1{font-size:50px;margin:16px 0 10px}
@media (max-width:480px){ .guide-head h1{font-size:38px} }
.rulechips{display:flex;gap:6px;flex-wrap:wrap;margin-top:14px}
.rulechips span{font-family:var(--f-mono);font-size:11.5px;font-weight:600;padding:3px 9px;border-radius:999px;background:var(--tint-moss-bg);color:var(--tint-moss-ink);border:1px solid var(--tint-moss-line)}
.gsec{scroll-margin-top:16px}
.gsec>h2{font-size:30px;margin:0 0 10px}
@media (max-width:480px){ .gsec>h2{font-size:26px} }
.sec-p{font-size:16px;line-height:1.65;color:var(--ink-2);margin:0 0 16px;max-width:700px}
.gsec h3{font-size:20px;margin:26px 0 8px}
.term{font-weight:700;color:var(--ink)}
.binder-tip{display:flex;gap:12px;align-items:flex-start;border-left:4px solid var(--ochre);background:var(--tint-ochre-bg);color:var(--tint-ochre-ink);border-radius:0 12px 12px 0;padding:12px 16px;margin:18px 0;font-size:15px;line-height:1.55}
.binder-tip b{font-family:var(--f-mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;display:block;margin-bottom:2px}
.visual{margin:8px 0 18px}
.check-panel{background:var(--paper);border:2px solid var(--slate);border-radius:var(--r-card);padding:24px 26px;margin-top:22px}
.check-panel>.sec-kicker{color:var(--moss)}
@media (max-width:480px){ .check-panel{padding:18px 16px} }
.beyond{border:2px dashed var(--dash);border-radius:var(--r-card);padding:24px;background:var(--paper-alt)}
.beyond .tagline{display:inline-block;font-family:var(--f-mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;font-weight:600;color:var(--ochre);border:1px solid var(--tint-ochre-line);border-radius:999px;padding:3px 10px;margin-bottom:10px}
.ex-links a{white-space:nowrap}
.mini-grid{display:grid;gap:12px;grid-template-columns:repeat(auto-fill,minmax(180px,1fr))}
.tile-card{background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:14px 16px}
.tile-card .k{font-family:var(--f-mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;font-weight:600;color:var(--rust);margin-bottom:4px}
.tile-card .h{font-family:var(--f-display);font-size:19px;font-weight:600;color:var(--slate);margin-bottom:4px}
.tile-card p{font-size:14px;line-height:1.5;color:var(--ink-2);margin:0 0 6px}

/* ---------- drills (shared by drills/*.html) ---------- */
.dbar{background:var(--slate);color:var(--on-slate);margin-bottom:24px}
.dbar-in{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;padding-top:14px;padding-bottom:14px}
.dtitle{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.dtitle h1{font-family:var(--f-display);font-size:24px;margin:0;color:var(--on-slate-hi)}
.dtitle .badge{background:transparent;color:var(--on-slate-hi);border-color:var(--on-slate-muted)}
.dstats{display:flex;gap:22px;margin:0}
.dstats div{text-align:right}
.dstats dt{font-family:var(--f-mono);font-size:10.5px;letter-spacing:.09em;text-transform:uppercase;color:var(--on-slate-muted)}
.dstats dd{margin:0;font-family:var(--f-display);font-size:22px;font-weight:700;color:var(--on-slate-hi)}
.dsetup fieldset{border:0;padding:0;margin:0 0 14px}
.dsetup legend{font-family:var(--f-mono);font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-bottom:6px}
.drow{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.dnote{font-size:13.5px;color:var(--muted);margin:6px 0 0}
.dresults h2{font-family:var(--f-display);font-size:30px;margin:4px 0}
.dresults h3{font-size:16px;margin:16px 0 6px}
.dmiss{list-style:none;padding:0;margin:0}
.dmiss li{padding:10px 0;border-top:1px solid var(--line)}
.dphoto{margin:0}
.dphoto img{width:100%;height:auto;display:block;border-radius:12px;border:1px solid var(--line);background:var(--tile)}
.dphoto figcaption{font-size:12px;color:var(--muted);margin-top:4px}
.dkeys{font-size:12.5px;color:var(--muted);margin-top:10px}
.dkeys kbd{font-family:var(--f-mono);font-size:11.5px;border:1px solid var(--line);border-bottom-width:2px;border-radius:5px;padding:1px 6px;background:var(--paper)}
@media (max-width:600px){ .dstats{gap:14px} .dstats dd{font-size:18px} .dtitle h1{font-size:20px} }
.qtimer{display:flex;align-items:center;gap:10px}
.qtimer .trk{display:block;flex:1;max-width:240px;height:6px;border-radius:3px;background:var(--line);overflow:hidden}
.qtimer .trk i{display:block;height:100%;background:var(--rust)}

/* ---------- key flowcharts (keytree.js) ---------- */
.ktree,.ktree ul{list-style:none;margin:0;padding:0}
/* Top-aligned: each question sits level with its first answer, so the start is at the top left. */
.ktree ul{display:flex;flex-direction:column;position:relative;padding-left:22px}
.ktree li{display:flex;align-items:flex-start;position:relative;padding:4px 0 4px 22px}
.ktree>li{padding-left:0}
.ktree ul::before{content:"";position:absolute;left:0;top:22px;width:22px;border-top:2px solid var(--dash)}
.ktree ul>li::before{content:"";position:absolute;left:0;top:22px;width:22px;border-top:2px solid var(--dash)}
.ktree ul>li::after{content:"";position:absolute;left:0;top:0;bottom:0;border-left:2px solid var(--dash)}
.ktree ul>li:first-child::after{top:22px}
.ktree ul>li:last-child::after{bottom:auto;height:22px}
.ktree ul>li:first-child:last-child::after{display:none}
.ktree li.closed>ul{display:none}
.knode{width:216px;flex:none;background:var(--paper);border:1.5px solid var(--line);border-radius:10px;padding:7px 36px 8px 10px;position:relative;font-size:13px;line-height:1.3;color:var(--ink)}
.kans{display:block;font-size:11.5px;color:var(--muted);margin-bottom:3px}
.kqt{display:block;font-size:13.5px}
.khow{display:block;font-size:11.5px;color:var(--ink-2);margin-top:3px;font-style:italic}
.knode.end{background:var(--tint-moss-bg);border-color:var(--tint-moss-line);padding-right:10px;width:auto;min-width:150px;max-width:216px}
.knode.end .kname{font-weight:700;color:var(--tint-moss-ink);font-size:14px}
.ksn{margin-left:6px;font-family:var(--f-mono);font-size:10px;font-weight:600;padding:1px 5px;border-radius:999px;background:var(--tint-ochre-bg);color:var(--tint-ochre-ink);border:1px solid var(--tint-ochre-line);vertical-align:1px}
.knode.jump{background:var(--tint-ochre-bg);border:1.5px dashed var(--tint-ochre-line);padding-right:10px}
.knode.jump a,.knode.jump .kjt{font-weight:700;color:var(--tint-ochre-ink);display:block}
.kjn{display:block;font-size:11px;color:var(--muted)}
.ktog{position:absolute;top:5px;right:5px;width:26px;height:26px;border:1px solid var(--line);border-radius:6px;background:var(--paper-alt);cursor:pointer;line-height:1;font-weight:700;color:var(--ink);font-size:15px;padding:0}
.ktog:focus-visible{outline:3px solid var(--rust);outline-offset:1px}
.ktree li.closed>.knode{border-style:dashed}
.searching .knode{opacity:.32}
.searching .knode.hit,.searching .knode.onpath{opacity:1}
.knode.onpath{border-color:var(--rust)}
.knode.hit{outline:3px solid var(--rust);outline-offset:1px}
@media print{ .knode,.ksn{print-color-adjust:exact;-webkit-print-color-adjust:exact} .ktog{display:none} }
/* Paper copies (keys print view and the Binder) use narrower boxes so charts stay readable at page width. */
.kpaper .ktog{display:none}
.kpaper .ktree{width:max-content}
.kpaper .knode{padding-right:8px;width:176px}
.kpaper .knode.end{max-width:176px;min-width:120px}
.kpaper .ktree ul,.kpaper .ktree li{padding-left:14px}
.kpaper .ktree>li{padding-left:0}
.kpaper .ktree ul::before,.kpaper .ktree ul>li::before{width:14px}