/* ===== AI for the Curious — shared site styles ===== */

@font-face{font-family:'Open Sans';font-weight:400;font-style:normal;font-display:swap;src:url("../fonts/OpenSans-Regular.ttf") format("truetype");}
@font-face{font-family:'Open Sans';font-weight:600;font-style:normal;font-display:swap;src:url("../fonts/OpenSans-SemiBold.ttf") format("truetype");}
@font-face{font-family:'Open Sans';font-weight:700;font-style:normal;font-display:swap;src:url("../fonts/OpenSans-Bold.ttf") format("truetype");}
@font-face{font-family:'Open Sans';font-weight:400;font-style:italic;font-display:swap;src:url("../fonts/OpenSans-Italic.ttf") format("truetype");}

:root{
  --bg:#F4EDE3;--surface:#FBF6EE;--surface-2:#FFFFFF;--ink:#2A211C;--muted:#786B5F;--faint:#A99B8B;
  --line:#E7DDCE;--line-soft:#F0E8DB;--accent:#BF5E38;--accent-ink:#9C4A2A;--accent-soft:rgba(191,94,56,.10);
  --cyan:#2E7A70;--cyan-soft:rgba(46,122,112,.10);--good:#3B7D53;--good-soft:rgba(59,125,83,.12);
  --shadow:0 1px 2px rgba(90,60,35,.05),0 12px 34px rgba(120,85,50,.09);
  --sans:"Open Sans",ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --mono:ui-monospace,"SF Mono","JetBrains Mono",Menlo,Consolas,monospace;
  --radius:14px;
}
@media (prefers-color-scheme:dark){:root{
  --bg:#1D1712;--surface:#26201A;--surface-2:#2F2820;--ink:#EFE7DC;--muted:#B4A798;--faint:#7C7061;
  --line:#372E26;--line-soft:#26201A;--accent:#D9754C;--accent-ink:#E7936E;--accent-soft:rgba(217,117,76,.15);
  --cyan:#4FA093;--cyan-soft:rgba(79,160,147,.15);--good:#63B37D;--good-soft:rgba(99,179,125,.15);
  --shadow:0 1px 2px rgba(0,0,0,.32),0 14px 36px rgba(0,0,0,.4);
}}
:root[data-theme="light"]{--bg:#F4EDE3;--surface:#FBF6EE;--surface-2:#FFFFFF;--ink:#2A211C;--muted:#786B5F;--faint:#A99B8B;--line:#E7DDCE;--line-soft:#F0E8DB;--accent:#BF5E38;--accent-ink:#9C4A2A;--accent-soft:rgba(191,94,56,.10);--cyan:#2E7A70;--cyan-soft:rgba(46,122,112,.10);--good:#3B7D53;--good-soft:rgba(59,125,83,.12);--shadow:0 1px 2px rgba(90,60,35,.05),0 12px 34px rgba(120,85,50,.09);}
:root[data-theme="dark"]{--bg:#1D1712;--surface:#26201A;--surface-2:#2F2820;--ink:#EFE7DC;--muted:#B4A798;--faint:#7C7061;--line:#372E26;--line-soft:#26201A;--accent:#D9754C;--accent-ink:#E7936E;--accent-soft:rgba(217,117,76,.15);--cyan:#4FA093;--cyan-soft:rgba(79,160,147,.15);--good:#63B37D;--good-soft:rgba(99,179,125,.15);--shadow:0 1px 2px rgba(0,0,0,.32),0 14px 36px rgba(0,0,0,.4);}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto} *{animation-duration:.001ms!important;animation-iteration-count:1!important;transition:none!important}}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
.wrap{max-width:1080px;margin:0 auto;padding:0 clamp(18px,5vw,40px)}
a{color:var(--accent-ink)}
h1,h2,h3{font-weight:700;letter-spacing:-.01em;line-height:1.12;text-wrap:balance;margin:0}
p{margin:0 0 1em}
img{max-width:100%}
::selection{background:var(--accent);color:var(--bg)}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:.5em;font-family:var(--sans);font-weight:700;font-size:.95rem;padding:12px 22px;border-radius:12px;text-decoration:none;border:1px solid var(--accent);background:var(--accent);color:#fff;cursor:pointer;transition:filter .15s,border-color .15s,background .15s}
.btn:hover{filter:brightness(1.06)}
.btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.btn.ghost{background:transparent;color:var(--accent-ink);border-color:var(--line)}
.btn.ghost:hover{border-color:var(--accent);filter:none}

/* theme toggle */
.theme-toggle{display:inline-flex;align-items:center;gap:.5em;font-family:var(--mono);font-size:12px;letter-spacing:.04em;text-transform:uppercase;background:var(--surface-2);color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:7px 13px;cursor:pointer}
.theme-toggle:hover{color:var(--ink);border-color:var(--accent)}
.theme-toggle:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* header */
.site-header{position:sticky;top:0;z-index:40;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;gap:16px;padding-top:14px;padding-bottom:14px}
.brand{display:inline-flex;align-items:center;text-decoration:none}
.brand img{height:30px;width:auto;display:block}
.site-header nav{margin-left:auto;display:flex;align-items:center;gap:8px 18px;flex-wrap:wrap}
.site-header nav a{color:var(--muted);text-decoration:none;font-weight:600;font-size:.95rem}
.site-header nav a:hover{color:var(--accent-ink)}

/* footer */
.site-footer{border-top:1px solid var(--line);margin-top:40px;padding:30px 0 60px;color:var(--faint);font-size:.9rem}
.site-footer .wrap{display:flex;flex-wrap:wrap;gap:10px 26px;justify-content:space-between;align-items:baseline}
.site-footer a{color:var(--cyan);text-decoration:none}
.site-footer .mono{font-family:var(--mono);font-size:12px}

.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--accent-ink);margin:0 0 12px}