/* BEStie landing site — single hand-written stylesheet, no frameworks */

:root {
  --accent: #0b62d6;
  --accent-dark: #084a9e;
  --ink: #1c2530;
  --ink-soft: #4b5a6a;
  --bg: #ffffff;
  --bg-soft: #f2f6fb;
  --bg-hero: linear-gradient(160deg, #eaf2fd 0%, #f8fbff 55%, #ffffff 100%);
  --border: #dce6f2;
  --good: #177245;
  --bad: #b3261e;
  --warn-bg: #fff7e6;
  --warn-border: #f0c36d;
  --radius: 14px;
  --maxw: 1080px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
}

img, video { max-width: 100%; height: auto; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 10px;
  padding-bottom: 10px;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: -0.02em;
}
.brand:hover { text-decoration: none; }

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--ink-soft);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 7px 12px;
  border-radius: 8px;
}
.site-nav a:hover { background: var(--bg-soft); color: var(--ink); text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--accent); background: var(--bg-soft); }

.nav-github {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--border);
  border-radius: 999px !important;
}

/* ---------- Hero ---------- */

.hero {
  background: var(--bg-hero);
  border-bottom: 1px solid var(--border);
  padding: 56px 0 48px;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: center;
}

.hero h1 {
  font-size: clamp(2rem, 4.5vw, 3rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin: 0 0 16px;
}

.hero .lede {
  font-size: 1.2rem;
  color: var(--ink-soft);
  margin: 0 0 26px;
}

.hero-photo {
  border-radius: var(--radius);
  box-shadow: 0 14px 40px rgba(11, 98, 214, 0.18);
  border: 1px solid var(--border);
}

.hero-caption {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-top: 8px;
  text-align: center;
}

.cta-row {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  align-items: center;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  padding: 12px 22px;
  border-radius: 10px;
  border: 1px solid var(--accent);
  font-size: 1rem;
}
.btn:hover { background: var(--accent-dark); text-decoration: none; color: #fff; }

.btn-outline {
  background: #fff;
  color: var(--accent);
}
.btn-outline:hover { background: var(--bg-soft); color: var(--accent-dark); }

.github-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #24292f;
  color: #fff;
  font-weight: 700;
  padding: 12px 20px;
  border-radius: 10px;
  font-size: 1rem;
  border: 1px solid #24292f;
}
.github-button:hover { background: #32383f; text-decoration: none; color: #fff; }

.star-count {
  background: rgba(255, 255, 255, 0.16);
  border-radius: 999px;
  padding: 2px 10px;
  font-variant-numeric: tabular-nums;
  font-size: 0.9em;
}
.star-count::before { content: "\2605"; color: #ffd33d; margin-right: 4px; }

/* ---------- Sections ---------- */

.section { padding: 52px 0; }
.section:nth-of-type(even) { background: var(--bg-soft); }

.section h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: -0.02em;
  margin: 0 0 18px;
}

.section > .container > p.lede,
.lede { color: var(--ink-soft); }

/* Feature grid ("Why BEStie") */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 18px;
  margin-top: 24px;
}

.feature {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
}
.feature h3 { margin: 0 0 8px; font-size: 1.08rem; }
.feature p { margin: 0; color: var(--ink-soft); font-size: 0.97rem; }

/* Steps ("How it works") */

.steps {
  list-style: none;
  counter-reset: step;
  padding: 0;
  margin: 26px 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.steps li {
  counter-increment: step;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px 20px 60px;
  position: relative;
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 18px;
  top: 20px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
}

.steps h3 { margin: 2px 0 6px; font-size: 1.05rem; }
.steps p { margin: 0; color: var(--ink-soft); font-size: 0.96rem; }

/* Star call-to-action band */

.star-cta {
  text-align: center;
  padding: 56px 0;
}

.star-cta h2 { margin-bottom: 10px; }
.star-cta p { color: var(--ink-soft); max-width: 560px; margin: 0 auto 24px; }

/* ---------- Board cards (hardware page) ---------- */

.board-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 22px;
  margin: 28px 0;
}

.board-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.15s ease;
}
.board-card:hover { box-shadow: 0 10px 30px rgba(28, 37, 48, 0.08); }

.board-photo {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: contain;
  background: #fff;
  padding: 14px;
  border-bottom: 1px solid var(--border);
}

.board-body { padding: 18px 20px 20px; display: flex; flex-direction: column; flex: 1; }
.board-body h3 { margin: 8px 0 10px; font-size: 1.15rem; }

.badge {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 4px 10px;
  border-radius: 999px;
}
.badge-recommended { background: #e2f4e9; color: var(--good); }
.badge-developers { background: #e7eefb; color: var(--accent-dark); }
.badge-caution { background: #fdeceb; color: var(--bad); }

.board-lists { display: grid; gap: 4px; margin-bottom: 14px; }

ul.pros, ul.cons {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.95rem;
  color: var(--ink-soft);
}
ul.pros li, ul.cons li { padding-left: 26px; position: relative; margin: 6px 0; }
ul.pros li::before { content: "✓"; position: absolute; left: 2px; color: var(--good); font-weight: 800; }
ul.cons li::before { content: "✕"; position: absolute; left: 2px; color: var(--bad); font-weight: 800; }

.board-link { margin-top: auto; font-weight: 600; }
.photo-credit { font-size: 0.78rem; color: var(--ink-soft); margin-top: 8px; }

/* Compatibility lists */

.compat-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 22px;
  margin-top: 22px;
}

.compat-box {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
}
.compat-box h3 { margin-top: 0; }
.compat-box ul { padding-left: 20px; color: var(--ink-soft); }
.compat-box li { margin: 6px 0; }

/* ---------- Callouts ---------- */

.callout {
  border: 1px solid var(--border);
  border-left: 5px solid var(--accent);
  background: var(--bg-soft);
  border-radius: 10px;
  padding: 16px 20px;
  margin: 22px 0;
}
.callout p:last-child { margin-bottom: 0; }

.callout-warning {
  border-left-color: #e3a008;
  background: var(--warn-bg);
  border-color: var(--warn-border);
}

/* ---------- Installation page ---------- */

.install-step {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 26px;
  margin: 20px 0;
}
.install-step h3 { margin-top: 0; }

.install-step video {
  display: block;
  border-radius: 10px;
  border: 1px solid var(--border);
  margin: 14px auto;
  max-width: 640px;
  width: 100%;
  background: #000;
}

.install-step img.illustration {
  display: block;
  border-radius: 10px;
  border: 1px solid var(--border);
  margin: 14px auto;
  max-width: 520px;
}

code, pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
}

code { background: var(--bg-soft); border: 1px solid var(--border); border-radius: 5px; padding: 1px 6px; }

pre {
  background: #0f1722;
  color: #d7e3f4;
  border-radius: 10px;
  padding: 16px 18px;
  overflow-x: auto;
}
pre code { background: none; border: none; padding: 0; color: inherit; }

kbd {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 6px;
  padding: 1px 7px;
  font-size: 0.88em;
  font-family: inherit;
}

/* ---------- FAQ ---------- */

.faq-list { margin-top: 24px; }

details.faq-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin: 14px 0;
  padding: 0;
}

details.faq-item summary {
  cursor: pointer;
  font-weight: 700;
  font-size: 1.05rem;
  padding: 18px 22px;
  list-style: none;
  position: relative;
  padding-right: 46px;
}
details.faq-item summary::-webkit-details-marker { display: none; }
details.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  color: var(--accent);
  font-weight: 400;
}
details.faq-item[open] summary::after { content: "–"; }
details.faq-item summary:hover { color: var(--accent); }

.faq-answer { padding: 0 22px 20px; color: var(--ink-soft); }
.faq-answer p:first-child { margin-top: 0; }
.faq-answer video {
  display: block;
  max-width: 560px;
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--border);
  margin: 12px auto;
  background: #000;
}

/* ---------- Page header (subpages) ---------- */

.page-header {
  background: var(--bg-hero);
  border-bottom: 1px solid var(--border);
  padding: 44px 0 34px;
}
.page-header h1 {
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  letter-spacing: -0.02em;
  margin: 0 0 10px;
}
.page-header p { color: var(--ink-soft); font-size: 1.1rem; margin: 0; max-width: 720px; }

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

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
  padding: 30px 0;
  margin-top: 20px;
  font-size: 0.95rem;
}
.footer-note { color: var(--ink-soft); font-size: 0.85rem; }

/* ---------- Responsive ---------- */

@media (max-width: 820px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-photo-wrap { order: -1; }
  .hero { padding: 36px 0; }
}