/* Headcase3D - shared styles for the landing page and the beta app.
   Brand cues from the current headcase3d.com: white/near-white ground,
   #2C2C2C ink, one green accent (#00DA73), Inter light for big type,
   Nickel Gothic (Adobe Fonts kit pot5edn) for uppercase section titles. */
:root {
  --green: #00da73;
  --green-dark: #00c766;
  --green-ink: #007a41;       /* green that reads as text on white */
  --green-soft: #e6fbf1;
  --ink: #2c2c2c;
  --black: #000;
  --muted: #666;
  --faint: #8a8a8a;
  --line: #e6e6e6;
  --bg: #fff;
  --bg-2: #fafafa;
  --bg-3: #f3f4f5;
  --warn: #b25e00;
  --warn-soft: #fff4e5;
  --bad: #c62828;
  --radius: 10px;
  --display: "nickel-gothic-variable", "Anton", "Arial Narrow", sans-serif;
  --text: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --mono: "IBM Plex Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.6 var(--text); -webkit-font-smoothing: antialiased; }
img, video { max-width: 100%; display: block; }
a { color: inherit; }
:focus-visible { outline: 3px solid var(--green); outline-offset: 2px; }

.container { max-width: 1120px; margin: 0 auto; padding-inline: 20px; }

/* header */
.site-header { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20; background: rgba(255,255,255,.94); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.site-header .container { display: flex; align-items: center; gap: 24px; min-height: 64px; }
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.logo .head { height: 34px; width: auto; }
.logo .type { height: 22px; width: auto; }
.nav { display: flex; gap: 22px; margin-left: auto; align-items: center; font-size: .95rem; }
.nav a { text-decoration: none; color: var(--muted); }
.nav a:hover { color: var(--ink); }
@media (max-width: 720px) { .nav a.hide-sm { display: none; } .logo .type { height: 18px; } }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; font: 600 .95rem var(--text); padding: 12px 22px; border-radius: 8px; border: 1px solid transparent; cursor: pointer; text-decoration: none; transition: background .15s, border-color .15s, transform .05s; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--green); color: #fff; }
.btn-primary:hover { background: var(--green-dark); }
.btn-ghost { background: #fff; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: #cfcfcf; }
.btn-sm { padding: 8px 14px; font-size: .88rem; }
.btn[disabled] { opacity: .45; cursor: not-allowed; }

/* type */
.eyebrow { display: inline-block; font: 600 .72rem var(--text); letter-spacing: .12em; text-transform: uppercase; color: var(--muted); background: var(--bg-3); border-radius: 999px; padding: 6px 14px; }
.display { font-family: var(--display); font-weight: 300; text-transform: uppercase; letter-spacing: .01em; line-height: 1.02; margin: 0; }
h1.hero-title { font: 300 clamp(2.4rem, 6vw, 4rem)/1.08 var(--text); color: var(--black); margin: 18px 0 0; text-wrap: balance; }
h1.hero-title .g { color: var(--green); font-weight: 600; }
.lede { color: var(--muted); font-size: 1.08rem; max-width: 58ch; margin: 16px auto 0; }
section h2.display { font-size: clamp(2rem, 4.5vw, 2.8rem); color: var(--black); }
.section-lede { color: var(--muted); max-width: 60ch; margin: 10px 0 0; }

/* layout blocks */
section.block { padding-block: 72px; }
section.alt { background: var(--bg-2); border-block: 1px solid var(--line); }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; margin-top: 32px; }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.card h3 { margin: 0 0 6px; font-size: 1.05rem; color: var(--black); }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }
.step-n { font: 400 2.4rem/1 var(--display); color: var(--green); margin-bottom: 10px; }
.tag { display: inline-block; font: 500 .72rem var(--mono); color: var(--green-ink); background: var(--green-soft); border-radius: 4px; padding: 2px 7px; margin-bottom: 10px; }
code { font: .88em var(--mono); background: var(--bg-3); padding: 1px 5px; border-radius: 4px; }

/* footer */
.site-footer { border-top: 1px solid var(--line); padding-block: 36px; color: var(--faint); font-size: .9rem; }
.site-footer .container { display: flex; flex-wrap: wrap; gap: 12px 28px; align-items: center; }
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer .spacer { flex: 1; }