/* Jugami Earth Science: geology field-notebook / rock strata theme */
:root{
  --ink:#25221e;          /* body text */
  --basalt:#2f3438;       /* basalt gray (header, footer, buttons) */
  --slate:#43566a;        /* slate blue-gray (links, headings accents) */
  --sand:#d8b27a;         /* sandstone */
  --sand-pale:#f2e4c8;    /* pale sandstone */
  --shale:#8a8178;        /* shale gray-brown */
  --magma:#d6551c;        /* magma orange (decoration) */
  --magma-dk:#a23d12;     /* magma orange dark enough for text */
  --paper:#f7f1e5;        /* field-notebook paper */
  --card:#fffaf0;
  --line:#d9cbb1;
  --grid:#e9dfcb;
  --mute:#57524b;
  --ok:#2f5d1d;
  --no:#8f2f1b;
  --radius:12px;
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
body{margin:0;color:var(--ink);font:18px/1.65 var(--sans);background-color:var(--paper);
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:28px 28px}
img,svg{max-width:100%}
a{color:var(--slate);text-underline-offset:2px}a:hover{color:var(--magma-dk)}
a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--magma-dk);outline-offset:2px}
.skip{position:absolute;left:-999px;top:0;background:#fff;color:var(--basalt);padding:.5rem 1rem;z-index:9;font-weight:700}.skip:focus{left:8px}
.visually-hidden{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;margin:-1px;padding:0;border:0}
.wrap{max-width:1060px;margin:0 auto;padding:0 1.1rem}
.prose{max-width:68ch}
/* header: basalt bar resting on sediment layers */
.site-head{background:var(--basalt);color:#f1e9da;position:relative;padding-bottom:12px}
.site-head::after{content:"";position:absolute;left:0;right:0;bottom:0;height:12px;
  background:linear-gradient(var(--sand) 0 4px,var(--magma) 4px 6px,var(--shale) 6px 9px,var(--slate) 9px 12px)}
.bar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.4rem 1rem;padding:.6rem 1.1rem}
.brand{display:flex;align-items:center;gap:.55rem;color:#f1e9da;text-decoration:none;font:700 1.1rem var(--serif);min-height:44px}
.brand:hover{color:#fff}
.head-nav{display:flex;flex-wrap:wrap;gap:0 .9rem}
.head-nav a{color:#e7dcc6;text-decoration:none;font-size:.97rem;display:inline-flex;align-items:center;min-height:44px;padding:0 .15rem;min-width:44px;justify-content:center}
.head-nav a:hover{color:#fff;text-decoration:underline}
.crumbs{font-size:.92rem;color:var(--mute);margin:1rem 0 0}
.crumbs a,.toc a,.pager a,.jugami-more a,.card h3 a{display:inline-flex;align-items:center;min-height:44px}
/* type */
[hidden]{display:none!important}
h1,h2,h3{font-family:var(--serif);color:var(--basalt);line-height:1.2}
h1{font-size:clamp(2.1rem,6vw,3.3rem);margin:.3rem 0}
h2{font-size:clamp(1.55rem,4vw,1.95rem);margin:2.6rem 0 .7rem;padding-bottom:.35rem;position:relative}
h2::after{content:"";position:absolute;left:0;bottom:0;width:min(100%,14rem);height:6px;border-radius:2px;
  background:linear-gradient(90deg,var(--sand) 0 40%,var(--shale) 40% 62%,var(--magma) 62% 72%,var(--slate) 72%)}
h3{font-size:1.45rem;margin:1.8rem 0 .5rem}
.kicker{font:700 .8rem var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--magma-dk);margin:0}
.tagline{font:italic 600 1.3rem var(--serif);color:var(--slate);margin:.2rem 0 .8rem}
/* hero */
.hero{display:grid;gap:1.4rem;align-items:center;padding:1rem 0}
@media(min-width:800px){.hero{grid-template-columns:1.05fr 1fr}}
.hero figure{margin:0}
.hero svg,.figure svg{width:100%;height:auto;display:block;border-radius:var(--radius);border:1px solid var(--line);box-shadow:0 3px 0 var(--line)}
.hero figcaption{font:.85rem var(--mono);color:var(--mute);margin-top:.4rem}
.btns{display:flex;flex-wrap:wrap;gap:.6rem;margin-top:1rem}
.btn{display:inline-flex;align-items:center;min-height:44px;background:var(--basalt);color:#fff;font:700 1rem var(--sans);padding:.7rem 1.15rem;border-radius:8px;text-decoration:none;border:2px solid var(--basalt);cursor:pointer;line-height:1.2}
.btn:hover{background:var(--slate);border-color:var(--slate);color:#fff}
.btn.alt{background:var(--card);color:var(--basalt)}.btn.alt:hover{background:var(--sand-pale);color:var(--basalt)}
.btn[disabled]{opacity:.5;cursor:not-allowed}
/* cards */
.cards{list-style:none;padding:0;margin:1rem 0;display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:1.1rem 1.1rem 1rem;position:relative}
.card svg{width:76px;height:76px;display:block}
.card h3{margin:.5rem 0 .3rem}.card p{margin:.3rem 0}
.card.live{border:2px solid var(--slate);box-shadow:5px 5px 0 var(--sand)}
.card.soon{background:#f1eadb;color:#3c3832}
.tag{position:absolute;top:.8rem;right:.8rem;font:700 .78rem var(--sans);padding:.15rem .6rem;border-radius:999px;background:#e3d8c1;color:#3b3325}
.tag.on{background:var(--basalt);color:#fff}
@media(min-width:860px){.cards.topics{grid-template-columns:repeat(3,1fr)}.cards.topics .card.live{grid-column:span 2}}
/* field-notebook notes */
.note{background:var(--card);border:1px solid var(--line);border-left:6px solid var(--slate);border-radius:8px;padding:.8rem 1.1rem;margin:1.2rem 0;max-width:70ch}
.note.dyk{border-left-color:var(--sand);background:#fdf5e4}
.note.how{border-left-color:var(--magma)}
.note p{margin:.35rem 0}
.toc{background:var(--card);border:1px dashed var(--shale);border-radius:var(--radius);padding:.8rem 1.1rem;margin:1.2rem 0}
.toc h2{font-size:1.15rem;margin:0;padding:0}.toc h2::after{display:none}
.toc ol{columns:2;margin:.4rem 0 0;padding-left:1.3rem}.toc li{margin:0;break-inside:avoid}
@media(max-width:620px){.toc ol{columns:1}}
.figure{margin:1.2rem 0;max-width:760px}
.figure figcaption{font-size:.95rem;color:var(--mute);margin-top:.4rem;max-width:68ch}
.terms{display:grid;gap:.8rem;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));list-style:none;padding:0}
.terms li{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:.8rem 1rem}
.terms strong{font-family:var(--serif);color:var(--basalt);font-size:1.1rem;display:block}
/* specimen (rock profile) cards */
.family{margin:1.6rem 0 0}
.family > p,.family > ul{max-width:68ch}
.specimens{list-style:none;padding:0;margin:1rem 0;display:grid;gap:1rem;grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}
.specimen{background:var(--card);border:1px solid var(--line);border-radius:6px;padding:2rem 1rem 1rem;box-shadow:3px 3px 0 var(--grid);position:relative}
.specimen::before{content:attr(data-no);position:absolute;top:.55rem;right:.9rem;font:700 .72rem var(--mono);color:var(--mute);letter-spacing:.06em}
.specimen svg{width:100%;height:64px;display:block;border-radius:4px;border:1px solid var(--line)}
.specimen h4{font:700 1.2rem var(--serif);margin:.6rem 0 .2rem;color:var(--basalt)}
.specimen dl{margin:.3rem 0 0;display:grid;grid-template-columns:auto 1fr;gap:.15rem .6rem;font-size:1.0625rem}
.specimen dt{font:700 .74rem/1.9 var(--mono);text-transform:uppercase;letter-spacing:.05em;color:var(--magma-dk)}
.specimen dd{margin:0}
.fam-ig{border-top:6px solid var(--magma)}.fam-sed{border-top:6px solid var(--sand)}.fam-met{border-top:6px solid var(--slate)}
table{border-collapse:collapse;width:100%;max-width:720px;background:var(--card);margin:.8rem 0}
caption{text-align:left;font-weight:700;padding:.3rem 0}
th,td{border:1px solid var(--line);padding:.45rem .65rem;text-align:left;vertical-align:top}th{background:var(--sand-pale)}
.table-scroll{overflow-x:auto;max-width:100%}
/* game */
.game{background:var(--card);border:2px solid var(--basalt);border-radius:var(--radius);padding:1rem 1.1rem;margin:1rem 0}
.game .help{color:var(--mute);margin:.2rem 0 .8rem}
.mission{background:var(--sand-pale);border-radius:8px;padding:.6rem .9rem;margin:.4rem 0 .8rem}
.mission p{margin:.2rem 0}
.mission .kicker{color:var(--magma-dk)}
.here{display:flex;gap:.9rem;align-items:center;flex-wrap:wrap;margin:.4rem 0 .6rem}
.here svg{width:120px;height:72px;flex:none;border-radius:6px;border:1px solid var(--line)}
.here p{margin:0}
.here .rock-name{font:700 1.3rem var(--serif);color:var(--basalt)}
.procs{border:1px solid var(--line);border-radius:10px;padding:.5rem .8rem .8rem;margin:0}
.procs legend{font-weight:700;padding:0 .3rem;color:var(--basalt)}
.chips{display:flex;flex-wrap:wrap;gap:.45rem}
.chip{font:600 .98rem var(--sans);background:#fff;color:var(--ink);border:2px solid var(--line);border-radius:8px;padding:.45rem .8rem;cursor:pointer;min-height:44px}
.chip:hover{border-color:var(--slate)}
.status{display:flex;flex-wrap:wrap;gap:.4rem 1.4rem;font-weight:700;margin:.8rem 0 .3rem}
.feedback{min-height:3.2em;font-weight:600;margin:.6rem 0 .3rem}
.feedback.ok{color:var(--ok)}.feedback.no{color:var(--no)}
.journey{margin:.4rem 0;padding-left:1.4rem;font-size:1rem}
.journey li{margin:.1rem 0}
/* quiz */
.quiz fieldset{border:1px solid var(--line);border-radius:10px;margin:.9rem 0;padding:.6rem 1rem;background:var(--card);max-width:760px}
.quiz legend{font-weight:700;float:left;width:100%;padding:.2rem 0 .3rem;margin:0}
.quiz legend+*{clear:both}
.quiz label{display:flex;gap:.55rem;align-items:center;min-height:44px;padding:.1rem 0;cursor:pointer}
.quiz input[type=radio]{width:1.1rem;height:1.1rem;flex:none;margin:0}
.fb{font-weight:600;margin:.3rem 0}.fb.ok{color:var(--ok)}.fb.no{color:var(--no)}
.score{font:700 1.2rem var(--serif);color:var(--basalt)}
.talk li{margin:.5rem 0}
.sources li{line-height:1.75;margin:.35rem 0}
.sources a{display:inline;padding:.66rem 0;-webkit-box-decoration-break:clone;box-decoration-break:clone}
/* pager + footer */
.pager{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.6rem;border-top:2px dashed var(--line);margin-top:2.6rem;padding-top:1rem}
.pager .soon-next{color:var(--mute)}
.site-foot{background:var(--basalt);color:#ece3d2;margin-top:3rem;padding:1.5rem 0;font-size:.97rem;position:relative}
.site-foot::before{content:"";position:absolute;left:0;right:0;top:0;height:8px;background:linear-gradient(var(--slate) 0 3px,var(--shale) 3px 5px,var(--sand) 5px 8px)}
.site-foot a{color:#f0cf98}.site-foot a:hover{color:#fff}
.site-foot p{margin:.3rem 0;max-width:80ch}
.jugami-more{margin-top:.9rem;line-height:1.5}
.jugami-more span{font-weight:700;margin-right:.3rem}

.diagram-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
.diagram-scroll:focus-visible{outline:3px solid var(--focus,#a23d12);outline-offset:3px}
.swipe-hint{display:none;font-size:.9rem;color:var(--mute);margin:.3rem 0 0}
@media (max-width:560px){.diagram-scroll svg{min-width:560px}.swipe-hint{display:block}}
.site-head .ja-widget .ja-login{color:#fff!important;min-height:44px;display:inline-flex;align-items:center;padding:0 .5rem}