/* ===========================================================
   Java GC — 共通トークンとベース
   index.html（基礎）と chronicle.html（年代記）で共有する
   =========================================================== */

:root{
  --bg:#e5e8ee; --surface:#fbfbfd; --surface-2:#f1f3f7; --surface-3:#e8ebf1;
  --ink:#11151c; --ink-2:#39424f; --muted:#5f6a7a; --faint:#8a94a3;
  --line:#c8cedb; --line-2:#dbe0ea;
  --live:#0e8a6a; --live-bg:#dff0ea;
  --mark:#b45309; --mark-bg:#f8ead6;
  --reloc:#6d28d9; --reloc-bg:#eae3fb;
  --stw:#b91c1c; --stw-bg:#f7dedb;
  --conc:#1d4ed8; --conc-bg:#dee6fb;
  --dead:#8e99a8; --dead-bg:#dfe3ea;
  --ramp-1:#eec3bd; --ramp-2:#dd8d82; --ramp-3:#c9554a; --ramp-4:#a81f14;
  --shadow:0 1px 2px rgba(17,21,28,.07), 0 6px 18px -8px rgba(17,21,28,.18);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#0e1116; --surface:#171b22; --surface-2:#1e232b; --surface-3:#262c36;
    --ink:#e8ebf1; --ink-2:#c3cad5; --muted:#98a2b2; --faint:#6d7787;
    --line:#333b47; --line-2:#272e38;
    --live:#2ba482; --live-bg:#12291f;
    --mark:#b47d38; --mark-bg:#2a2013;
    --reloc:#8f74db; --reloc-bg:#221c33;
    --stw:#d86055; --stw-bg:#2e1714;
    --conc:#5b86de; --conc-bg:#161f33;
    --dead:#6b7482; --dead-bg:#1f242c;
    --ramp-1:#4a2b28; --ramp-2:#7e3f38; --ramp-3:#b35347; --ramp-4:#e0705f;
    --shadow:0 1px 2px rgba(0,0,0,.4), 0 8px 24px -10px rgba(0,0,0,.6);
  }
}
:root[data-theme="dark"]{
  --bg:#0e1116; --surface:#171b22; --surface-2:#1e232b; --surface-3:#262c36;
  --ink:#e8ebf1; --ink-2:#c3cad5; --muted:#98a2b2; --faint:#6d7787;
  --line:#333b47; --line-2:#272e38;
  --live:#2ba482; --live-bg:#12291f;
  --mark:#b47d38; --mark-bg:#2a2013;
  --reloc:#8f74db; --reloc-bg:#221c33;
  --stw:#d86055; --stw-bg:#2e1714;
  --conc:#5b86de; --conc-bg:#161f33;
  --dead:#6b7482; --dead-bg:#1f242c;
  --ramp-1:#4a2b28; --ramp-2:#7e3f38; --ramp-3:#b35347; --ramp-4:#e0705f;
  --shadow:0 1px 2px rgba(0,0,0,.4), 0 8px 24px -10px rgba(0,0,0,.6);
}

*{box-sizing:border-box}
body{
  background:var(--bg); color:var(--ink);
  font-family:"IBM Plex Sans JP","Hiragino Sans","Noto Sans JP",system-ui,sans-serif;
  font-size:15px; line-height:1.85; margin:0;
  -webkit-font-smoothing:antialiased;
}
.mono{font-family:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace}
h1,h2,h3,h4{text-wrap:balance; margin:0; line-height:1.35}
a{color:var(--conc)}
a:focus-visible, button:focus-visible{outline:2px solid var(--conc); outline-offset:2px; border-radius:3px}

.wrap{max-width:1180px; margin:0 auto; padding:0 20px; padding-block:30px 64px}

/* ---------- サイトヘッダー ---------- */
.site{
  position:sticky; top:env(safe-area-inset-top, 0px); z-index:30;
  background:color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter:blur(10px); border-bottom:1px solid var(--line);
}
.site-in{
  max-width:1180px; margin:0 auto; padding:0 20px;
  display:flex; align-items:center; gap:22px; height:50px;
}
.brand{
  font-family:"IBM Plex Mono",monospace; font-size:13px; font-weight:600;
  letter-spacing:.06em; color:var(--ink); text-decoration:none; white-space:nowrap;
}
.brand span{color:var(--stw)}
.site nav{display:flex; gap:4px; margin-left:auto}
.site nav a{
  font-size:13px; color:var(--muted); text-decoration:none; padding:5px 11px;
  border-radius:5px; white-space:nowrap; transition:color .15s, background .15s;
}
.site nav a:hover{color:var(--ink); background:var(--surface-2)}
.site nav a[aria-current="page"]{color:var(--ink); font-weight:600; background:var(--surface-2)}

/* ---------- タイポグラフィ ---------- */
.eyebrow{
  font-family:"IBM Plex Mono",monospace; font-size:11px; letter-spacing:.18em;
  text-transform:uppercase; color:var(--stw); margin:0 0 10px; font-weight:500;
}
h1{font-size:clamp(30px,5.4vw,46px); font-weight:700; letter-spacing:-.015em}
.lede{color:var(--muted); max-width:64ch; margin:14px 0 0; font-size:15.5px}
.lede strong{color:var(--ink-2); font-weight:600}
.section-label{
  font-family:"IBM Plex Mono",monospace; font-size:11px; letter-spacing:.16em;
  text-transform:uppercase; color:var(--faint); font-weight:500;
}
code{
  font-family:"IBM Plex Mono",ui-monospace,Menlo,monospace; font-size:.88em;
  background:var(--surface-2); padding:1px 5px; border-radius:3px; color:var(--ink);
}

/* ---------- パーツ ---------- */
.panel{
  background:var(--surface); border:1px solid var(--line-2);
  border-radius:8px; box-shadow:var(--shadow);
}
.tip{
  font-size:13.5px; color:var(--ink-2); background:var(--surface-2);
  border-left:2px solid var(--mark); border-radius:0 5px 5px 0; padding:11px 13px;
  line-height:1.8;
}
.tip b{font-weight:600; color:var(--ink)}
.tip > b:first-child{
  color:var(--mark); font-weight:600; display:block; font-size:11px;
  font-family:"IBM Plex Mono",monospace; letter-spacing:.12em;
  text-transform:uppercase; margin-bottom:3px;
}
.btn{
  font:inherit; font-size:13.5px; font-weight:500; cursor:pointer;
  background:var(--surface-2); color:var(--ink); border:1px solid var(--line);
  border-radius:6px; padding:7px 15px; transition:all .15s; white-space:nowrap;
  text-decoration:none; display:inline-block;
}
.btn:hover:not(:disabled){background:var(--surface-3); border-color:var(--muted)}
.btn:disabled{opacity:.4; cursor:not-allowed}
.btn.primary{background:var(--ink); color:var(--surface); border-color:var(--ink)}
.btn.primary:hover:not(:disabled){opacity:.87; background:var(--ink)}

footer{
  margin-top:34px; padding-top:18px; border-top:1px solid var(--line);
  font-size:12px; color:var(--faint); line-height:1.9;
}
footer a{color:var(--muted)}

@media (prefers-reduced-motion: reduce){
  *{transition-duration:.01ms !important; animation-duration:.01ms !important}
}