/* Project landing pages (layouts/projects/single.html). Standalone, no theme CSS. */

/*
  Layout only. Every landing has its own theme, css/landing-<theme>.css, which sets
  these tokens on .theme-<theme> (and may restyle anything else):
  --bg, --bg-alt, --surface, --surface-hover, --border, --text, --muted,
  --accent, --accent-strong, --accent-soft (tinted fill), --accent-line (tinted border),
  --on-accent, --code-bg, --code-text, --nav-bg, --hero-bg, --radius, --font, --font-mono.
*/

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 1rem/1.6 var(--font);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); }
code, pre { font-family: var(--font-mono); }
h1, h2, h3 { letter-spacing: -.02em; line-height: 1.15; margin: 0; }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 800; }
h3 { font-size: 1.05rem; font-weight: 600; }

.wrap { width: min(100% - 2rem, 1040px); margin-inline: auto; }

/* nav */
.nav {
  position: sticky; top: 0; z-index: 10;
  background: var(--nav-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav__row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; height: 3.5rem; }
.nav__logo { font-weight: 800; font-size: 1.15rem; color: var(--text); text-decoration: none; }
.nav__links { display: flex; align-items: center; gap: 1.25rem; }
.nav__links a { color: var(--muted); text-decoration: none; font-size: .9rem; }
.nav__links a:hover { color: var(--text); }
.nav__lang { padding: .15rem .5rem; border: 1px solid var(--border); border-radius: .4rem; }
@media (max-width: 640px) {
  .nav__links a:not(.nav__lang) { display: none; }
}

/* hero */
.hero {
  padding: clamp(4rem, 12vw, 7.5rem) 0 clamp(3rem, 8vw, 5rem);
  background: var(--hero-bg);
  text-align: center;
}
.badge {
  display: inline-block; margin: 0 0 1.25rem; padding: .3rem .8rem;
  border: 1px solid var(--accent-line); border-radius: 999px;
  color: var(--accent); font-size: .85rem; font-weight: 600;
}
.hero__title { font-size: clamp(2.2rem, 6vw, 3.6rem); font-weight: 800; max-width: 18ch; margin-inline: auto; }
.hero__lead { max-width: 40rem; margin: 1.25rem auto 0; color: var(--muted); font-size: 1.15rem; }
.hero__cta { display: flex; flex-wrap: wrap; justify-content: center; gap: .75rem; margin-top: 2rem; }

.btn {
  display: inline-block; padding: .75rem 1.4rem; border-radius: .7rem;
  border: 1px solid var(--border); background: var(--surface);
  color: var(--text); font-weight: 600; text-decoration: none;
  transition: background .15s, transform .15s;
}
.btn:hover { background: var(--surface-hover); transform: translateY(-1px); }
.btn--primary { background: var(--accent-strong); border-color: var(--accent-strong); color: var(--on-accent); }
.btn--primary:hover { background: var(--accent); }

/* sections */
.section { padding: clamp(3rem, 8vw, 5rem) 0; scroll-margin-top: 3.5rem; }
.section--alt { background: var(--bg-alt); border-block: 1px solid var(--border); }
.section__lead { color: var(--muted); max-width: 44rem; margin: .75rem 0 0; font-size: 1.05rem; }

.problems { margin: 1.5rem 0; padding: 0; list-style: none; display: grid; gap: .6rem; counter-reset: p; }
.problems li {
  counter-increment: p; display: flex; gap: .9rem; align-items: center;
  padding: .8rem 1rem; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface);
}
.problems li::before {
  content: counter(p); flex: none; display: grid; place-items: center;
  width: 1.8rem; height: 1.8rem; border-radius: 50%;
  background: var(--accent-soft); color: var(--accent); font-weight: 600; font-size: .9rem;
}

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr)); gap: 1rem; margin-top: 2rem; }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr)); }
.card { padding: 1.25rem; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.card p { margin: .5rem 0 0; color: var(--muted); font-size: .95rem; }
.card code { font-size: .85em; color: var(--text); }
.card--link { text-decoration: none; color: var(--text); transition: border-color .15s, transform .15s; }
.card--link:hover { border-color: var(--accent-line); transform: translateY(-2px); }
.card--link h3 { color: var(--accent); }

.steps { margin: 1.5rem 0 0; padding-left: 1.25rem; display: grid; gap: .4rem; }
.steps code { font-size: .9em; }

.code { display: grid; gap: 1rem; margin-top: 2rem; }
.code figure { margin: 0; min-width: 0; }
.code figcaption { color: var(--muted); font-size: .85rem; margin-bottom: .4rem; }
.code pre {
  margin: 0; padding: 1rem; overflow-x: auto;
  background: var(--code-bg); border: 1px solid var(--border); border-radius: var(--radius);
  font-size: .82rem; line-height: 1.5; color: var(--code-text); tab-size: 2;
}

.limits { margin: 1.5rem 0 0; padding-left: 1.25rem; display: grid; gap: .5rem; color: var(--muted); }
.limits strong { color: var(--text); }

/* footer */
.footer { padding: 2rem 0; border-top: 1px solid var(--border); color: var(--muted); font-size: .9rem; }
.footer__row { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .5rem 2rem; }
.footer p { margin: 0; }

/* under the hood (optional "engine" section) */
.engine__kicker {
  margin: 0 0 .5rem; color: var(--accent);
  font: 600 .8rem/1 var(--font-mono); text-transform: uppercase; letter-spacing: .12em;
}
.engine__list {
  list-style: none; margin: 2rem 0 0; padding: 0;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(19rem, 1fr)); gap: .75rem 2rem;
}
.engine__list li { position: relative; padding-left: 1.4rem; color: var(--muted); }
.engine__list li::before { content: "›"; position: absolute; left: 0; color: var(--accent); font-weight: 800; }
.engine__list strong { color: var(--text); }
.engine__callout {
  margin-top: 2.5rem; padding: 1.25rem 1.5rem;
  border: 1px solid var(--accent-line); border-radius: var(--radius);
  background: var(--accent-soft);
}
.engine__callout h3 { color: var(--accent); font-size: 1.1rem; }
.engine__callout p { margin: .5rem 0 0; color: var(--muted); }