/*
 * Aero Design Analysis home page
 * Author: Anthony Spohn
 *
 * Shares the Compressible Flow Calculator's palette and typefaces so the
 * home page and the tools read as one site. Follows the system light/dark theme.
 */

:root{
  --bg:#eef1ee;
  --surface:#ffffff;
  --surface-2:#f5f7f4;
  --ink:#151b1f;
  --ink-dim:#5c6b66;
  --line:#d2d8d0;
  --line-strong:#b7c0b6;
  --accent:#c1531f;
  --accent-2:#256d8a;
  --shadow:0 1px 2px rgba(21,27,31,.06), 0 8px 22px rgba(21,27,31,.07);
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#10151a;
    --surface:#171d23;
    --surface-2:#1c232a;
    --ink:#e7ece7;
    --ink-dim:#8fa39c;
    --line:#2b343b;
    --line-strong:#3a444c;
    --accent:#e2814c;
    --accent-2:#5fabd0;
    --shadow:0 1px 2px rgba(0,0,0,.4), 0 10px 26px rgba(0,0,0,.4);
    color-scheme:dark;
  }
}

*{box-sizing:border-box}
body{
  margin:0; background:var(--bg); color:var(--ink);
  font-family:'Public Sans', system-ui, sans-serif; line-height:1.55;
}
.wrap{max-width:1040px; margin:0 auto; padding:0 16px}
a{color:inherit}
:focus-visible{outline:2px solid var(--accent-2); outline-offset:3px; border-radius:4px}

/* ---------- Top bar ---------- */
.masthead{border-bottom:1px solid var(--line)}
.bar{display:flex; align-items:center; justify-content:space-between; gap:16px; min-height:64px; flex-wrap:wrap}
.logo{display:flex; align-items:center; gap:10px; text-decoration:none; font-family:'Archivo',sans-serif; font-weight:800; font-size:17px; letter-spacing:-.01em}
.logo img{border-radius:7px}
nav{display:flex; gap:22px}
nav a{font-size:14px; font-weight:500; color:var(--ink-dim); text-decoration:none}
nav a:hover{color:var(--ink)}

/* ---------- Hero ---------- */
.hero{padding:64px 0 0}
.eyebrow{
  font-family:'IBM Plex Mono',monospace; font-size:12px; font-weight:600;
  letter-spacing:.14em; text-transform:uppercase; color:var(--accent-2); margin:0 0 14px;
}
h1{
  font-family:'Archivo',sans-serif; font-weight:800; letter-spacing:-.02em;
  font-size:clamp(32px,5.2vw,54px); line-height:1.06; margin:0; max-width:17ch; text-wrap:balance;
}
.lede{font-size:17px; color:var(--ink-dim); max-width:62ch; margin:20px 0 0}

/* Decorative streamlines crossed by shock waves. */
.shock{margin-top:44px; border-bottom:2px solid var(--line-strong)}
.shock svg{display:block; width:100%; height:110px}
.shock .flow{stroke:var(--line-strong); stroke-width:1.5; stroke-dasharray:6 8; fill:none}
.shock .wave{stroke:var(--accent); stroke-width:3; fill:none}
.shock .wave.dim{opacity:.4}

/* ---------- Calculator cards ---------- */
.section-title{
  font-family:'Archivo',sans-serif; font-weight:700; font-size:13px;
  letter-spacing:.08em; text-transform:uppercase; color:var(--ink-dim); margin:48px 0 18px;
}
.grid{display:grid; grid-template-columns:1fr 1fr; gap:20px}
.tool{
  display:flex; flex-direction:column; text-decoration:none;
  background:var(--surface); border:1px solid var(--line); border-radius:12px;
  box-shadow:var(--shadow); padding:24px;
  transition:border-color .15s, transform .15s;
}
.tool:hover{border-color:var(--accent-2); transform:translateY(-2px)}
.tool-head{display:flex; gap:16px; align-items:center}
.tool-head img{border-radius:11px; flex-shrink:0}
.tag{font-family:'IBM Plex Mono',monospace; font-size:11.5px; color:var(--accent-2); margin:0 0 2px}
.tool h3{font-family:'Archivo',sans-serif; font-weight:700; font-size:21px; line-height:1.2; margin:0}
.tool > p{color:var(--ink-dim); margin:16px 0 12px}
.tool ul{list-style:none; margin:0 0 20px; padding:0; border-top:1px solid var(--line)}
.tool li{
  font-size:14px; padding:7px 0; border-bottom:1px solid var(--line);
  font-variant-numeric:tabular-nums;
}
.tool li::before{content:"›"; color:var(--accent); font-weight:700; margin-right:9px}
.go{
  margin-top:auto; align-self:flex-start;
  font-family:'Archivo',sans-serif; font-weight:700; font-size:14px;
  color:var(--accent);
}

/* ---------- About ---------- */
.about-grid{display:grid; grid-template-columns:1.3fr 1fr; gap:32px; align-items:start}
.about-grid > p{margin:0; color:var(--ink-dim); max-width:60ch}
dl{margin:0; border-top:1px solid var(--line)}
dl div{display:grid; grid-template-columns:90px 1fr; gap:12px; padding:9px 0; border-bottom:1px solid var(--line); font-size:14px}
dt{font-family:'IBM Plex Mono',monospace; font-size:12px; color:var(--ink-dim); padding-top:1px}
dd{margin:0}

/* ---------- Footer ---------- */
.site-foot{margin-top:64px; border-top:1px solid var(--line); padding:22px 0 34px; font-size:13px; color:var(--ink-dim)}
.site-foot .wrap{display:flex; justify-content:space-between; flex-wrap:wrap; gap:8px 24px}

@media (max-width:760px){
  .grid,.about-grid{grid-template-columns:1fr}
  .hero{padding-top:40px}
  nav{gap:16px}
}
@media (prefers-reduced-motion:reduce){ .tool{transition:none} .tool:hover{transform:none} }