/* rustdv.org — plain CSS, no framework.
   Palette drawn from the rustdv logo: terracotta, charcoal, cream. */

:root {
  --rust: #bf4527;        /* terracotta from the logo gears */
  --rust-dark: #9e3a20;
  --ink: #26302e;         /* charcoal from the logo linework */
  --ink-soft: #4b5654;
  --cream: #f6f1e7;       /* logo background */
  --cream-deep: #ede5d4;
  --card: #fffdf8;
  --line: #ddd3c0;
  --code-bg: #2b2320;
  --code-ink: #f0e7d8;
  --max: 1060px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--cream);
  line-height: 1.6;
}

code, pre, .mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas,
    "Liberation Mono", monospace;
}

a { color: var(--rust-dark); }
a:hover { color: var(--rust); }

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ---------- header ---------- */

.site-header {
  background: var(--cream);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-height: 64px;
  flex-wrap: wrap;
  padding-top: 0.4rem;
  padding-bottom: 0.4rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--ink);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.02em;
}

.brand img { height: 44px; width: auto; }

.site-nav {
  margin-left: auto;
  display: flex;
  gap: 1.1rem;
  flex-wrap: wrap;
  align-items: center;
}

.site-nav a {
  text-decoration: none;
  color: var(--ink-soft);
  font-weight: 500;
  font-size: 0.95rem;
}

.site-nav a:hover { color: var(--rust); }

.site-nav a.nav-cta {
  background: var(--rust);
  color: #fff;
  padding: 0.4rem 0.9rem;
  border-radius: 6px;
}

.site-nav a.nav-cta:hover { background: var(--rust-dark); color: #fff; }

.site-nav a.nav-coffee {
  font-size: 1.35rem;
  line-height: 1;
  text-decoration: none;
}

.site-nav a.nav-coffee:hover { transform: scale(1.15); display: inline-block; }

/* ---------- hero ---------- */

.hero {
  text-align: center;
  padding: 4rem 1rem 3.5rem;
}

.hero img.hero-logo {
  width: min(320px, 70vw);
  height: auto;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  margin: 1.2rem 0 0.6rem;
  letter-spacing: -0.01em;
}

.hero .release-badge {
  display: inline-block;
  margin: 0.9rem 0 0.4rem;
  padding: 0.3rem 0.95rem;
  border: 1.5px solid var(--rust);
  border-radius: 999px;
  color: var(--rust-dark);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.hero p.pitch {
  max-width: 46rem;
  margin: 0 auto 1.8rem;
  font-size: 1.18rem;
  color: var(--ink-soft);
}

.cta-row {
  display: flex;
  gap: 0.9rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.6rem;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  font-size: 1.05rem;
}

.btn-primary {
  background: var(--rust);
  color: #fff;
  border: 2px solid var(--rust);
}

.btn-primary:hover { background: var(--rust-dark); border-color: var(--rust-dark); color: #fff; }

.btn-secondary {
  background: transparent;
  color: var(--ink);
  border: 2px solid var(--ink);
}

.btn-secondary:hover { color: var(--rust-dark); border-color: var(--rust-dark); }

/* ---------- sections ---------- */

section { padding: 3.2rem 0; }

section.alt { background: var(--cream-deep); }

section h2 {
  font-size: 1.9rem;
  text-align: center;
  margin: 0 0 0.5rem;
}

section p.section-lede {
  text-align: center;
  max-width: 44rem;
  margin: 0 auto 2.2rem;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

/* ---------- code sample ---------- */

.code-sample {
  background: var(--code-bg);
  color: var(--code-ink);
  border-radius: 10px;
  padding: 1.2rem 1.4rem;
  overflow-x: auto;
  font-size: 0.86rem;
  line-height: 1.5;
  max-width: 780px;
  margin: 0 auto;
}

.code-sample .kw { color: #e8985f; }
.code-sample .fn { color: #a7c7a4; }
.code-sample .cm { color: #8a7f72; }
.code-sample .st { color: #d9b98a; }

.code-caption {
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.9rem;
  margin-top: 0.8rem;
}

/* ---------- how it works ---------- */

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.2rem;
  margin-top: 2rem;
}

.step {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1.3rem 1.3rem 1.1rem;
}

.step .num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--rust);
  color: #fff;
  font-weight: 700;
  margin-bottom: 0.7rem;
}

.step h3 { margin: 0 0 0.4rem; font-size: 1.05rem; }
.step p { margin: 0; font-size: 0.95rem; color: var(--ink-soft); }

/* ---------- benefits ---------- */

.benefits {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.2rem;
  margin-top: 2rem;
}

.benefit {
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 4px solid var(--rust);
  border-radius: 10px;
  padding: 1.3rem 1.4rem;
}

.benefit h3 { margin: 0 0 0.5rem; font-size: 1.08rem; }
.benefit p { margin: 0; font-size: 0.95rem; color: var(--ink-soft); }

/* ---------- book section ---------- */

.book-panel {
  display: flex;
  gap: 2.4rem;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}

.book-panel .book-copy { max-width: 34rem; }
.book-panel h2 { text-align: left; }

/* ---------- story / level-5 ---------- */

.story-panel {
  display: flex;
  gap: 2.2rem;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}

.story-panel img {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--card);
  box-shadow: 0 2px 10px rgba(38, 48, 46, 0.18);
}

.story-panel .story-copy { max-width: 36rem; }
.story-panel h2 { text-align: left; }

/* ---------- article pages ---------- */

.article {
  max-width: 860px;
  margin: 0 auto;
  padding: 2.6rem 1.25rem 3.5rem;
}

.article h1 { font-size: 2.1rem; margin-bottom: 0.4rem; }
.article h2 { font-size: 1.5rem; text-align: left; margin-top: 2.4rem; }
.article h3 { font-size: 1.15rem; margin-top: 1.8rem; }

.article .subtitle { color: var(--ink-soft); font-size: 1.1rem; margin-top: 0; }

.article table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.4rem 0 2rem;
  font-size: 0.9rem;
  background: var(--card);
}

.article th {
  background: var(--ink);
  color: var(--cream);
  text-align: left;
  padding: 0.55rem 0.8rem;
}

.article td {
  border-bottom: 1px solid var(--line);
  padding: 0.5rem 0.8rem;
  vertical-align: top;
}

.article tr:nth-child(even) td { background: var(--cream-deep); }

.article code {
  background: var(--cream-deep);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0.08rem 0.3rem;
  font-size: 0.85em;
  white-space: nowrap;
}

.article th code {
  background: transparent;
  border: none;
  color: inherit;
}

.article pre {
  background: var(--code-bg);
  color: var(--code-ink);
  border-radius: 8px;
  padding: 1rem 1.2rem;
  overflow-x: auto;
  font-size: 0.88rem;
}

.article pre code {
  background: transparent;
  border: none;
  padding: 0;
  white-space: pre;
  font-size: inherit;
}

.table-scroll { overflow-x: auto; }

.note {
  background: var(--cream-deep);
  border-left: 4px solid var(--rust);
  border-radius: 6px;
  padding: 0.8rem 1.1rem;
  margin: 1.4rem 0;
  font-size: 0.95rem;
}

/* ---------- footer ---------- */

.site-footer {
  background: var(--ink);
  color: var(--cream);
  padding: 2.6rem 0 2rem;
  margin-top: 0;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.6rem;
}

.footer-cols h4 {
  margin: 0 0 0.6rem;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #b9ab90;
}

.footer-cols ul { list-style: none; margin: 0; padding: 0; }
.footer-cols li { margin-bottom: 0.45rem; }

.footer-cols a {
  color: var(--cream);
  text-decoration: none;
  font-size: 0.95rem;
}

.footer-cols a:hover { color: #e8985f; }

.footer-bottom {
  border-top: 1px solid #3c4644;
  margin-top: 2rem;
  padding-top: 1.2rem;
  font-size: 0.85rem;
  color: #b9ab90;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

@media (max-width: 640px) {
  .hero { padding-top: 2.5rem; }
  .site-nav { gap: 0.8rem; font-size: 0.9rem; }
}