/* The Labyrinth — shared tokens. Light is the default; .dark is the indigo dark theme. */
:root{
  --bg:#f7f8fc; --bg-rgb:247,248,252; --bg2:#eef1f7; --panel:#ffffff; --panel-a:rgba(255,255,255,.86); --line:#dfe4ee;
  --text:#0f172a; --muted:#566074; --soft:#334155;
  --accent:#4f46e5; --accent-rgb:79,70,229; --accent2:#0e7490; --on-accent:#ffffff; --warn:#b45309;
  --logo:#4f46e5; --wall:rgba(71,85,105,.13); --head:#ffffff;
  --word:linear-gradient(100deg,#0f172a 0%,#312e81 45%,var(--accent) 75%,var(--accent2) 100%);
  --ok:#047857; --ok-bg:#ecfdf5; --alert:#b45309; --alert-bg:#fff7ed; --red:#b91c1c; --red-bg:#fef2f2; --blue:#1d4ed8; --blue-bg:#eff6ff;
  --shadow:0 1px 2px rgba(15,23,42,.05),0 10px 30px -18px rgba(15,23,42,.25);
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  color-scheme:light;
}
html.dark{
  --bg:#0b1020; --bg-rgb:11,16,32; --bg2:#10172b; --panel:#141b31; --panel-a:rgba(20,27,49,.80); --line:#262f4d;
  --text:#e6e9f5; --muted:#a3abc6; --soft:#cdd3e8;
  --accent:#818cf8; --accent-rgb:129,140,248; --accent2:#a5b4fc; --on-accent:#0b1020; --warn:#fbbf24;
  --logo:#a5b4fc; --wall:rgba(148,163,214,.10); --head:#eef0ff;
  --word:linear-gradient(100deg,#fff 0%,#e0e7ff 40%,#a5b4fc 70%,#818cf8 100%);
  --ok:#86c9a4; --ok-bg:rgba(134,201,164,.10); --alert:#fbbf24; --alert-bg:rgba(251,191,36,.10); --red:#fca5a5; --red-bg:rgba(248,113,113,.12); --blue:#93c5fd; --blue-bg:rgba(96,165,250,.12);
  --shadow:0 30px 60px -30px rgba(0,0,0,.75);
  color-scheme:dark;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--sans);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:6px}
.skip{position:absolute;left:-999px;top:8px;background:var(--accent);color:var(--on-accent);padding:8px 12px;border-radius:6px;z-index:20;font-weight:700}
.skip:focus{left:8px}
.logo{color:var(--logo)}

/* top bar (sub pages) */
.topbar{position:sticky;top:0;z-index:10;background:rgba(var(--bg-rgb),.85);backdrop-filter:saturate(1.4) blur(10px);-webkit-backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:14px clamp(16px,4vw,48px);font-family:var(--mono);font-size:.85rem;color:var(--muted);max-width:1240px;margin:0 auto}
.brand{display:flex;align-items:center;gap:10px;color:var(--text);text-decoration:none;font-weight:700;letter-spacing:.12em}
.brand svg{width:28px;height:28px}
.links{display:flex;align-items:center;gap:4px}
.links a{text-decoration:none;padding:7px 11px;border-radius:8px;color:var(--muted);white-space:nowrap}
.links a:hover{color:var(--text);background:var(--bg2)}
.links a[aria-current="page"]{color:var(--accent);background:rgba(var(--accent-rgb),.09);font-weight:700}
.theme-btn{display:inline-grid;place-items:center;width:36px;height:36px;border-radius:10px;border:1px solid var(--line);background:var(--panel);color:var(--text);cursor:pointer;margin-left:6px;flex:none}
.theme-btn svg{width:17px;height:17px}
.theme-btn .sun{display:none} html.dark .theme-btn .sun{display:block} html.dark .theme-btn .moon{display:none}
@media (max-width:640px){.links a.opt{display:none}.links a{padding:6px 8px}.brand .bt{display:none}}

.eyebrow{font-family:var(--mono);color:var(--accent);font-size:.8rem;letter-spacing:.18em;text-transform:uppercase;margin:0 0 10px}
.btn{display:inline-flex;align-items:center;gap:10px;font-weight:800;text-decoration:none;padding:13px 22px;border-radius:12px;font-size:1rem;transition:transform .15s,box-shadow .2s,background .2s;border:0;cursor:pointer;font-family:inherit}
.btn-primary{background:var(--accent);color:var(--on-accent);box-shadow:0 10px 30px -10px rgba(var(--accent-rgb),.6)}
.btn-primary:hover{transform:translateY(-2px)}
.btn-ghost{border:1px solid var(--line);color:var(--text);background:var(--panel-a)}
.btn-ghost:hover{border-color:var(--accent)}
.btn svg{width:18px;height:18px}

.sim{display:inline-flex;align-items:center;gap:6px;font-family:var(--mono);font-size:.74rem;font-weight:700;letter-spacing:.06em;color:var(--warn);border:1px dashed currentColor;padding:3px 9px;border-radius:999px}
.page-head{padding:clamp(36px,6vw,64px) clamp(16px,5vw,48px) 8px;max-width:1240px;margin:0 auto}
.page-head h1{font-size:clamp(2rem,5vw,3rem);line-height:1.1;margin:0 0 12px;letter-spacing:-.02em}
.page-head .lead{color:var(--muted);font-size:clamp(1rem,2.4vw,1.15rem);max-width:720px;margin:0}

.words{display:flex;flex-wrap:wrap;gap:8px 18px;margin:18px 0 0;padding:14px 16px;background:var(--panel);border:1px solid var(--line);border-radius:12px;font-size:.92rem;color:var(--muted);list-style:none}
.words li b{color:var(--text)}

footer{border-top:1px solid var(--line);padding:28px 20px;display:flex;align-items:center;justify-content:center;gap:10px;color:var(--muted);font-family:var(--mono);font-size:.82rem;flex-wrap:wrap;text-align:center}
.fmark{width:18px;height:18px;opacity:.8}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
.sr{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---- Matrix theme (opt-in, homepage only) ---- */
#rain{display:none}
.theme-btn .term-ic{display:none}
html.dark .theme-btn[data-cycle="3"] .sun{display:none}
html.dark .theme-btn[data-cycle="3"] .term-ic{display:block}
html.matrix .theme-btn .sun{display:block} html.matrix .theme-btn .moon{display:none}
html.matrix{
  --bg:#000000; --bg-rgb:0,0,0; --bg2:rgba(0,12,4,.82); --panel:rgba(2,10,4,.86); --panel-a:rgba(2,10,4,.84); --line:rgba(0,255,102,.38);
  --text:#e6ffee; --muted:#9fe0b4; --soft:#cbf7d8;
  --accent:#00ff66; --accent-rgb:0,255,102; --accent2:#7dffb0; --on-accent:#001a09; --warn:#ffd166;
  --logo:#00ff66; --wall:rgba(0,255,102,.08); --head:#eafff1;
  --word:linear-gradient(100deg,#ffffff 0%,#c8ffd9 40%,#00ff66 75%,#7dffb0 100%);
  --ok:#7dffb0; --ok-bg:rgba(0,255,102,.10); --alert:#ffd166; --alert-bg:rgba(255,209,102,.10); --red:#ff8a8a; --red-bg:rgba(255,90,90,.12); --blue:#8ccfff; --blue-bg:rgba(80,170,255,.12);
  --shadow:0 0 0 1px rgba(0,255,102,.10),0 0 24px -6px rgba(0,255,102,.35);
  color-scheme:dark; background:#000;
}
html.matrix body{background:transparent}
html.matrix #rain{position:fixed;inset:0;width:100vw;height:100vh;z-index:-1;pointer-events:none;opacity:.32}
html.matrix #maze{display:none}
html.matrix h1,html.matrix h2,html.matrix h3{font-family:var(--mono);letter-spacing:-.01em}
html.matrix .card{box-shadow:var(--shadow);backdrop-filter:blur(1.5px)}
html.matrix .term{background:rgba(0,6,2,.9);border-color:var(--line);box-shadow:var(--shadow)}
html.matrix .term-bar{background:rgba(0,20,8,.9);border-color:var(--line)}
html.matrix .term .p{color:#00ff66} html.matrix .term .k{color:#9fffc4} html.matrix .term .w{color:#ffd166}

/* ---- small-screen nav ---- */
.links .sh{display:none}
.theme-btn{flex-shrink:0}
.brand{flex-shrink:0;min-width:0}
.links{min-width:0}
@media (max-width:480px){
  .nav{gap:8px;padding-left:14px;padding-right:14px;font-size:.8rem}
  .links{gap:2px}
  .links a{padding:6px 7px}
  .links .lg{display:none} .links .sh{display:inline}
  .status{display:none}
  .theme-btn{margin-left:2px;width:34px;height:34px}
}
@media (max-width:360px){
  .nav{gap:4px;padding-left:10px;padding-right:10px;font-size:.76rem}
  .links a{padding:5px 5px}
  .brand .bt{display:none}
}