/* ── Reset & base ─────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:         #ffffff;
  --surface:    #f6f8fa;
  --border:     #e1e4e8;
  --accent:     #4e4e7f;
  --accent-hi:  #0366d6;
  --text:       #24292e;
  --text-dim:   #586069;
  --text-head:  #24292e;
  --code-bg:    #f6f8fa;
  --radius:     6px;
  --font:       -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono:       "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

/* ── Layout ───────────────────────────────────────────────────────────────── */
.container { max-width: 900px; margin: 0 auto; padding: 0 1.5rem; }

/* ── Header ───────────────────────────────────────────────────────────────── */
.site-header {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-title { font-size: 1.25rem; font-weight: 600; }
.site-title a { color: var(--text-head); }
.site-title a:hover { text-decoration: none; color: var(--accent-hi); }
.site-tagline { font-size: 0.8rem; color: var(--text-dim); margin-top: 0.15rem; }

.header-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; }

/* ── Buttons ──────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s, border-color .15s;
  white-space: nowrap;
  border: 1px solid transparent;
}
.btn:hover { text-decoration: none; }
.btn-primary {
  background: #2ea44f;
  color: #fff;
  border-color: rgba(27,31,35,.15);
}
.btn-primary:hover { background: #2c974b; }
.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border);
}
.btn-secondary:hover { background: #e9ebec; }

/* ── Main content ─────────────────────────────────────────────────────────── */
.site-main { flex: 1; padding: 2.5rem 0; }

h1, h2, h3, h4 { color: var(--text-head); line-height: 1.3; font-weight: 600; }
h1 { font-size: 2rem;   margin-bottom: 0.75rem; }
h2 { font-size: 1.3rem; margin: 2.5rem 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 1px solid var(--border); }
h3 { font-size: 1rem;   margin: 1.5rem 0 0.4rem; }
p  { margin-bottom: 1rem; }

ul, ol { margin: 0 0 1rem 1.5rem; }
li { margin-bottom: 0.3rem; }

/* ── Hero ─────────────────────────────────────────────────────────────────── */
.hero {
  background: linear-gradient(135deg, var(--accent) 0%, #35355e 100%);
  border-radius: 8px;
  padding: 3rem 2rem;
  margin-bottom: 2.5rem;
  text-align: center;
  border: 1px solid #c8c8e0;
}
.hero h1 { font-size: 2.6rem; color: #fff; margin-bottom: 0.5rem; }
.hero p   { font-size: 1.1rem; color: rgba(255,255,255,.85); margin-bottom: 1.5rem; }
.hero .actions { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }
.hero .btn-primary  { font-size: 1rem; padding: 0.55rem 1.4rem; }
.hero .btn-secondary {
  font-size: 1rem;
  padding: 0.55rem 1.4rem;
  background: rgba(255,255,255,.15);
  color: #fff;
  border-color: rgba(255,255,255,.3);
}
.hero .btn-secondary:hover { background: rgba(255,255,255,.25); }

/* ── Screenshot & lightbox ────────────────────────────────────────────────── */
.screenshot {
  margin: 1.5rem 0;
  text-align: center;
}
.screenshot img {
  max-width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: 0 4px 16px rgba(0,0,0,.1);
  cursor: zoom-in;
}
.screenshot figcaption {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 0.5rem;
}

/* lightbox: CSS :target approach — no JS, works reliably with Jekyll */
.lightbox-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.85);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}
.lightbox-overlay:target { display: flex; }

.lightbox-overlay img {
  max-width: 95vw;
  max-height: 92vh;
  border-radius: var(--radius);
  box-shadow: 0 8px 48px rgba(0,0,0,.6);
  cursor: zoom-out;
}

.lightbox-close {
  position: absolute;
  top: 1rem;
  right: 1.25rem;
  font-size: 2rem;
  line-height: 1;
  color: #fff;
  text-decoration: none;
  user-select: none;
  opacity: .8;
}
.lightbox-close:hover { opacity: 1; text-decoration: none; }

/* ── Code blocks ──────────────────────────────────────────────────────────── */
pre, code {
  font-family: var(--mono);
  font-size: 0.875rem;
}
code {
  background: var(--code-bg);
  padding: 0.15em 0.4em;
  border-radius: 3px;
  color: #24292e;
  border: 1px solid var(--border);
}
pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin: 1rem 0;
}
pre code { background: none; padding: 0; border: none; color: var(--text); }

/* ── Tables ───────────────────────────────────────────────────────────────── */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.875rem;
}
th, td { padding: 0.5rem 0.85rem; border: 1px solid var(--border); text-align: left; }
th { background: var(--surface); color: var(--text-head); font-weight: 600; }
tr:nth-child(even) td { background: var(--surface); }

/* ── Footer ───────────────────────────────────────────────────────────────── */
.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 1.25rem 0;
  font-size: 0.8rem;
  color: var(--text-dim);
  text-align: center;
}
.site-footer a { color: var(--text-dim); }
.site-footer a:hover { color: var(--accent-hi); text-decoration: underline; }

/* ── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .hero h1 { font-size: 1.9rem; }
  .header-inner { flex-direction: column; align-items: flex-start; }
}