/* RudolfAnthonie Technology Labs — site styles */

:root {
  --ink: #16181d;
  --ink-soft: #4b5261;
  --paper: #fafaf8;
  --card: #ffffff;
  --line: #e6e5e0;
  --indigo: #4f46e5;
  --indigo-deep: #3730a3;
  --amber: #f5b301;
  --display: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  --body: "Inter", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--body);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; }
a { color: var(--indigo); }

/* ---------- Header ---------- */

.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--line);
  padding: 1rem 0;
}

.header-inner {
  max-width: 70rem;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
}

.brand .spark { width: 32px; height: 32px; flex: none; }

.brand-text { line-height: 1.1; }

.brand-name {
  display: block;
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.brand-sub {
  display: block;
  font-family: var(--display);
  font-weight: 500;
  font-size: 0.64rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.site-nav { display: flex; gap: 0.55rem 1.6rem; flex-wrap: wrap; }

.site-nav a {
  color: var(--ink);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
}

.site-nav a:hover { color: var(--indigo); }
.site-nav a[aria-current="page"] { border-bottom-color: var(--amber); }

/* ---------- Hero (home) ---------- */

.hero {
  background:
    radial-gradient(circle at 85% 15%, rgba(245, 179, 1, 0.12), transparent 40%),
    radial-gradient(circle at 10% 90%, rgba(79, 70, 229, 0.08), transparent 45%),
    var(--card);
  border-bottom: 1px solid var(--line);
  padding: 6rem 1.5rem 5.5rem;
}

.hero-inner { max-width: 70rem; margin: 0 auto; }

.hero h1 {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(2.2rem, 5.5vw, 4rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 1.5rem;
  max-width: 18ch;
}

.hero h1 em {
  font-style: normal;
  color: var(--indigo);
}

.hero p {
  max-width: 40rem;
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--ink-soft);
  margin: 0 0 2.5rem;
}

.cta {
  display: inline-block;
  background: var(--indigo);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  padding: 0.8rem 1.6rem;
  border-radius: 8px;
  transition: background 0.2s;
}

.cta:hover { background: var(--indigo-deep); }

.cta.ghost {
  background: transparent;
  color: var(--indigo);
  border: 1.5px solid var(--indigo);
  margin-left: 0.75rem;
}

.cta.ghost:hover { background: rgba(79, 70, 229, 0.06); }

/* ---------- Cards ---------- */

.cards {
  max-width: 70rem;
  margin: 0 auto;
  padding: 4rem 1.5rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 2rem 1.75rem;
  text-decoration: none;
  color: var(--ink);
  transition: transform 0.2s, box-shadow 0.2s;
}

a.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 36px rgba(22, 24, 29, 0.08);
}

.card .kicker {
  font-family: var(--display);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
  margin: 0 0 0.5rem;
}

.card h3 {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.35rem;
  margin: 0 0 0.6rem;
}

.card p { margin: 0; color: var(--ink-soft); font-size: 0.975rem; }

.card .more {
  display: inline-block;
  margin-top: 1.1rem;
  color: var(--indigo);
  font-weight: 600;
  font-size: 0.9rem;
}

/* ---------- Page hero (subpages) ---------- */

.page-hero {
  background: var(--card);
  border-bottom: 1px solid var(--line);
  padding: 3.5rem 1.5rem 3rem;
}

.page-hero .hero-inner { max-width: 70rem; margin: 0 auto; }

.page-hero h1 {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  letter-spacing: -0.02em;
  margin: 0;
}

.page-hero p { color: var(--ink-soft); margin: 0.75rem 0 0; max-width: 44rem; }

/* ---------- Content ---------- */

main.content {
  max-width: 44rem;
  margin: 0 auto;
  padding: 3.5rem 1.5rem 4.5rem;
}

main.content h2 {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.5rem;
  margin: 2.5rem 0 0.75rem;
}

main.content h2:first-child { margin-top: 0; }

main.content .lede { font-size: 1.2rem; }

/* ---------- Process steps ---------- */

.steps { max-width: 44rem; margin: 0 auto; padding: 0 1.5rem 4.5rem; }

.step {
  display: flex;
  gap: 1.5rem;
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--line);
}

.step:last-child { border-bottom: 0; }

.step .num {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--amber);
  min-width: 2.2rem;
}

.step h3 {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.2rem;
  margin: 0 0 0.4rem;
}

.step p { margin: 0; color: var(--ink-soft); }

/* ---------- Contact ---------- */

.contact-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 2.5rem 2rem;
  text-align: center;
  margin-top: 2rem;
}

.contact-card .email {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.4rem;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid var(--amber);
}

.contact-card .email:hover { color: var(--indigo); }

/* ---------- Footer ---------- */

.site-footer {
  background: var(--ink);
  color: rgba(255, 255, 255, 0.75);
  padding: 3rem 1.5rem;
  font-size: 0.9rem;
}

.footer-inner {
  max-width: 70rem;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-footer .tagline {
  font-family: var(--display);
  font-weight: 700;
  color: #fff;
}

.site-footer .tagline .bulb { color: var(--amber); }

.site-footer a { color: #fff; text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }

@media (max-width: 640px) {
  .brand .spark { width: 26px; height: 26px; }
  .brand-name { font-size: 1.15rem; }
  .hero { padding: 3.5rem 1.5rem; }
  .cta.ghost { margin-left: 0; margin-top: 0.75rem; }
}

/* ---------- Contact form ---------- */

.contact-form { margin-top: 2rem; display: flex; flex-direction: column; gap: 0.4rem; }
.contact-form label { font-family: var(--display); font-weight: 700; font-size: 0.9rem; margin-top: 0.9rem; }
.contact-form input, .contact-form textarea {
  font: inherit; color: var(--ink); background: var(--card);
  border: 1px solid var(--line); border-radius: 8px; padding: 0.7rem 0.9rem;
}
.contact-form input:focus, .contact-form textarea:focus { outline: 2px solid var(--indigo); border-color: var(--indigo); }
.cf-turnstile { margin-top: 1.2rem; }
.form-submit {
  margin-top: 1.2rem; align-self: flex-start; cursor: pointer;
  font: inherit; font-weight: 600; color: #fff; background: var(--indigo);
  border: 0; border-radius: 8px; padding: 0.8rem 1.6rem; transition: background 0.2s;
}
.form-submit:hover { background: var(--indigo-deep); }
.alt-contact { margin-top: 2rem; color: var(--ink-soft); font-size: 0.95rem; }

/* ---------- Notes (index) ---------- */

.note-list { max-width: 44rem; margin: 0 auto; padding: 2.5rem 1.5rem 4.5rem; }
.note { padding: 1.75rem 0; border-bottom: 1px solid var(--line); }
.note:last-child { border-bottom: 0; }
.note .meta {
  font-family: var(--display); font-size: 0.8rem; font-weight: 700;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--amber); margin: 0;
}
.note .meta .date {
  color: var(--ink-soft); font-family: var(--body); font-weight: 500;
  letter-spacing: normal; text-transform: none; margin-left: 0.6rem;
}
.note h2 { font-family: var(--display); font-weight: 700; font-size: 1.45rem; margin: 0.35rem 0 0.4rem; }
.note h2 a { color: var(--ink); text-decoration: none; }
.note h2 a:hover { color: var(--indigo); }
.note p { margin: 0; color: var(--ink-soft); }
.note .read { display: inline-block; margin-top: 0.8rem; color: var(--indigo); font-weight: 600; font-size: 0.9rem; text-decoration: none; }

/* ---------- Notes (article) ---------- */

.article { max-width: 44rem; margin: 0 auto; padding: 3rem 1.5rem 4.5rem; }
.article .meta {
  font-family: var(--display); font-size: 0.8rem; font-weight: 700;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--amber); margin: 0;
}
.article .meta .date {
  color: var(--ink-soft); font-family: var(--body); font-weight: 500;
  letter-spacing: normal; text-transform: none; margin-left: 0.6rem;
}
.article h1 {
  font-family: var(--display); font-weight: 700;
  font-size: clamp(1.8rem, 4vw, 2.5rem); letter-spacing: -0.02em;
  line-height: 1.15; margin: 0.5rem 0 1.5rem;
}
.article h2 { font-family: var(--display); font-weight: 700; font-size: 1.3rem; margin: 2.2rem 0 0.6rem; }
.article h3 { font-family: var(--display); font-weight: 700; font-size: 1.1rem; margin: 1.8rem 0 0.5rem; }
.article p { margin: 0 0 1.2rem; }
.article ul { margin: 0 0 1.2rem; padding-left: 1.2rem; }
.article li { margin-bottom: 0.5rem; }
.article blockquote {
  margin: 1.8rem 0; padding-left: 1.3rem;
  border-left: 3px solid var(--line); color: var(--ink-soft); font-style: italic;
}
.article pre {
  background: #16181d; color: #f5f5f2; border-radius: 10px;
  padding: 1.1rem 1.3rem; overflow-x: auto; font-size: 0.9rem; margin: 0 0 1.4rem;
}
.article code { font-size: 0.92em; }
.pull {
  border-left: 3px solid var(--indigo); padding: 0.2rem 0 0.2rem 1.3rem; margin: 1.8rem 0;
  font-family: var(--display); font-weight: 500; font-size: 1.15rem; color: var(--ink);
}
.backlink { color: var(--indigo); font-weight: 600; text-decoration: none; font-size: 0.9rem; }
.backlink:hover { text-decoration: underline; }