/* SciREPL landing pages — shared stylesheet.
   Palette follows www/css/style.css so pages read as the same product. */

:root {
  --bg: #0d1117;
  --bg-raised: #161b22;
  --bg-card: #1c2128;
  --border: #30363d;
  --text: #e6edf3;
  --text-2: #8b949e;
  --accent: #58a6ff;
  --action: #1f6feb;
  --action-end: #8250df;
  --green: #3fb950;
  --orange: #d29922;
  --code-bg: #0d1117;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
  --font-mono: 'Fira Code', 'Cascadia Code', 'JetBrains Mono', 'SF Mono', Menlo, Consolas, monospace;
  --radius: 12px;
  --gutter: 16px;
  --max: 1080px;
  color-scheme: dark light;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #ffffff;
    --bg-raised: #f6f8fa;
    --bg-card: #ffffff;
    --border: #d0d7de;
    --text: #1f2328;
    --text-2: #59636e;
    --accent: #0969da;
    --action: #0969da;
    --green: #1a7f37;
    --orange: #9a6700;
    --code-bg: #f6f8fa;
    --shadow: 0 12px 32px rgba(31, 35, 40, 0.15);
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 72px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 var(--font-sans);
  -webkit-text-size-adjust: 100%;
}

a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }
img { max-width: 100%; height: auto; display: block; }
code, pre { font-family: var(--font-mono); }
:not(pre) > code {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.1em 0.35em;
  font-size: 0.9em;
}

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

.skip { position: absolute; left: -999px; }
.skip:focus { left: var(--gutter); top: 8px; z-index: 10; background: var(--bg); padding: 8px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.site-header .wrap { display: flex; align-items: center; gap: 16px; min-height: 56px; }
.brand {
  font-weight: 700; font-size: 1.15rem; text-decoration: none;
  background: linear-gradient(90deg, var(--accent), var(--action-end));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.site-nav { display: flex; gap: 18px; margin-left: auto; font-size: 0.92rem; }
.site-nav a { color: var(--text-2); text-decoration: none; }
.site-nav a:hover { color: var(--text); }
.header-cta { margin-left: 8px; }
@media (max-width: 760px) {
  .site-nav { display: none; }
  .header-cta { margin-left: auto; }
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 48px; padding: 12px 20px;
  border-radius: 10px; font-weight: 600; text-decoration: none; font-size: 1rem;
  border: 1px solid transparent; cursor: pointer;
}
.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--action), var(--action-end));
  box-shadow: 0 4px 18px color-mix(in srgb, var(--action) 35%, transparent);
}
.btn-primary:hover { filter: brightness(1.08); }
.btn-secondary { color: var(--text); border-color: var(--border); background: var(--bg-raised); }
.btn-secondary:hover { border-color: var(--accent); }
.btn-small { min-height: 36px; padding: 6px 14px; font-size: 0.9rem; }
.btn:focus-visible, a:focus-visible, button:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

/* Hero */
.hero { padding: 48px 0 32px; }
.hero .wrap { display: grid; gap: 40px; align-items: center; grid-template-columns: 1.15fr 0.85fr; }
.eyebrow { color: var(--accent); font-weight: 600; font-size: 0.9rem; letter-spacing: 0.02em; margin: 0 0 8px; }
.hero h1 { font-size: clamp(2rem, 5.5vw, 3.1rem); line-height: 1.12; margin: 0 0 16px; letter-spacing: -0.01em; }
.hero .lede { font-size: 1.15rem; color: var(--text-2); margin: 0 0 24px; max-width: 34em; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 14px; }
.fineprint { color: var(--text-2); font-size: 0.88rem; margin: 0; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 20px 0 0; }
.chips li {
  font-size: 0.85rem; padding: 4px 10px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--bg-raised); color: var(--text-2);
}
@media (max-width: 860px) {
  .hero { padding-top: 32px; }
  .hero .wrap { grid-template-columns: 1fr; gap: 28px; }
}

/* Phone frame */
.phone {
  margin: 0 auto; width: min(300px, 78vw);
  border-radius: 34px; padding: 10px;
  background: linear-gradient(160deg, #2d333b, #0b0e13);
  box-shadow: var(--shadow);
}
.phone img { border-radius: 26px; width: 100%; }
figure { margin: 0; }
figcaption { color: var(--text-2); font-size: 0.85rem; text-align: center; margin-top: 12px; }

/* Sections */
section { padding: 48px 0; }
section + section { border-top: 1px solid var(--border); }
h2 { font-size: clamp(1.5rem, 3.6vw, 2rem); line-height: 1.2; margin: 0 0 12px; }
h3 { font-size: 1.1rem; margin: 0 0 8px; }
.section-lede { color: var(--text-2); margin: 0 0 28px; max-width: 42em; }

.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px;
}
.card p { margin: 0; color: var(--text-2); }

/* Examples */
.example {
  display: grid; gap: 28px; align-items: start;
  grid-template-columns: 1.2fr 0.8fr; padding: 28px 0;
}
.example + .example { border-top: 1px dashed var(--border); }
.example p { color: var(--text-2); }
.example-text { grid-template-columns: minmax(0, 46em); }
@media (max-width: 860px) { .example { grid-template-columns: 1fr; } }
/* Grid children default to min-width:auto, which lets a long code line widen the page. */
.hero .wrap > *, .example > *, .grid > * { min-width: 0; }

.code {
  position: relative; background: var(--code-bg);
  border: 1px solid var(--border); border-radius: 10px; margin: 12px 0;
}
.code-label {
  display: flex; justify-content: space-between; align-items: center;
  padding: 6px 8px 6px 14px; border-bottom: 1px solid var(--border);
  font: 600 0.75rem/1.4 var(--font-mono); color: var(--green); letter-spacing: 0.04em;
}
.code-label.lang-prolog { color: var(--orange); }
.copy-btn {
  font: 500 0.8rem/1 var(--font-sans); color: var(--text-2);
  background: transparent; border: 1px solid var(--border); border-radius: 6px;
  padding: 6px 10px; cursor: pointer; min-height: 32px;
}
.copy-btn:hover { color: var(--text); border-color: var(--accent); }
.code pre { margin: 0; padding: 14px; overflow-x: auto; font-size: 0.88rem; line-height: 1.55; }

/* Lists */
.checks { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.checks li { padding-left: 28px; position: relative; }
.checks li::before { content: "✓"; position: absolute; left: 4px; color: var(--green); font-weight: 700; }
.limits li::before { content: "–"; color: var(--orange); }
.steps { padding-left: 1.3em; display: grid; gap: 12px; margin: 0; }
.steps li::marker { color: var(--accent); font-weight: 700; }

/* Table */
.table-scroll { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); }
table { border-collapse: collapse; width: 100%; min-width: 480px; font-size: 0.95rem; }
th, td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--border); vertical-align: top; }
thead th { background: var(--bg-raised); font-size: 0.85rem; color: var(--text-2); }
tbody tr:last-child td { border-bottom: 0; }
td.yes { color: var(--green); }
td.no { color: var(--text-2); }

/* Closing CTA */
.closing {
  text-align: center;
  background: radial-gradient(ellipse at top, color-mix(in srgb, var(--action-end) 18%, transparent), transparent 70%);
}
.closing .cta-row { justify-content: center; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 28px 0 40px; color: var(--text-2); font-size: 0.9rem; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-bottom: 10px; }
.site-footer a { color: var(--text-2); }
.site-footer p { margin: 0; }