/* MobileCOBOL — mobilecobol.com
   Fresh design 2026-08. Hand-rolled, no framework, system fonts.
   Palette: ink navy + warm paper + one confident green accent. */

:root {
  --ink: #14213d;
  --ink-2: #3a4a6b;
  --paper: #fbfaf7;
  --card: #ffffff;
  --line: #e6e2d8;
  --accent: #2f9e60;
  --accent-dark: #23794a;
  --code: #eef2ee;
  --max: 1080px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
}
img { max-width: 100%; display: block; }
a { color: var(--accent-dark); }
h1, h2, h3, h4 { line-height: 1.2; font-weight: 700; }
code {
  background: var(--code);
  padding: 0.1em 0.35em;
  border-radius: 4px;
  font-size: 0.92em;
}

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* --- nav --- */
.nav {
  position: sticky; top: 0; z-index: 10;
  background: rgba(251, 250, 247, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 60px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; color: var(--ink);
  font-size: 1.15rem; letter-spacing: -0.01em;
}
.brand b { color: var(--accent-dark); }
.nav nav { display: flex; align-items: center; gap: 22px; }
.nav nav a {
  text-decoration: none; color: var(--ink-2); font-size: 0.95rem;
}
.nav nav a:hover { color: var(--ink); }

/* --- buttons --- */
.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  border: 1px solid transparent;
}
.btn-small { padding: 8px 16px; font-size: 0.9rem; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); }
.btn-ghost { border-color: var(--ink-2); color: var(--ink); }
.btn-ghost:hover { background: #fff; }
.btn-small { background: var(--ink); color: #fff; }
.btn-small:hover { background: var(--ink-2); }

/* --- hero --- */
.hero {
  background:
    radial-gradient(1200px 500px at 70% -10%, #21365f 0%, transparent 60%),
    var(--ink);
  color: #f4f6fb;
  padding: 84px 0 64px;
}
.hero h1 {
  font-size: clamp(2.2rem, 5.5vw, 3.6rem);
  letter-spacing: -0.02em;
  margin-bottom: 18px;
}
.hero .lede {
  max-width: 46rem;
  font-size: 1.2rem;
  color: #cfd8ea;
  margin-bottom: 28px;
}
.hero .lede b { color: #fff; }
.hero-buttons { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 30px; }
.hero .btn-ghost { border-color: #7b8cad; color: #eaf0fa; }
.hero .btn-ghost:hover { background: rgba(255,255,255,0.08); }
.hero-compilers {
  font-size: 0.95rem; color: #9fb0cd;
  border-top: 1px solid #2c3d63; padding-top: 18px; max-width: 52rem;
}
.hero-compilers b, .hero-compilers i { color: #d7e0f2; }

/* --- sections --- */
section { padding: 72px 0; }
section h2 {
  font-size: clamp(1.6rem, 3.6vw, 2.2rem);
  margin-bottom: 14px;
  letter-spacing: -0.015em;
}
.section-lede { max-width: 46rem; color: var(--ink-2); margin-bottom: 34px; }
.section-foot {
  max-width: 46rem; color: var(--ink-2);
  margin-top: 26px; font-size: 0.98rem;
}

/* --- surfaces (proof) --- */
.surfaces { background: #fff; border-block: 1px solid var(--line); }
.surface-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.surface {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}
.surface { display: flex; flex-direction: column; }
.surface img {
  width: 100%; height: 520px; object-fit: contain;
  background: #f2f0ea; padding: 14px 0;
}
.surface figcaption { margin-top: auto; }
.surface figcaption {
  padding: 12px 16px;
  font-size: 0.95rem;
  color: var(--ink-2);
  border-top: 1px solid var(--line);
}
.surface figcaption b { color: var(--ink); }

/* --- legacy screens --- */
.legacy-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}
.surface-wide img {
  width: 100%; height: auto; max-height: 460px; object-fit: contain;
  background: #fff; padding: 10px 0;
}

/* --- paths --- */
.path-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.path {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 26px;
}
.path h3 { font-size: 1.15rem; margin-bottom: 12px; }
.path p { color: var(--ink-2); font-size: 0.98rem; margin-bottom: 14px; }
.path ul { padding-left: 18px; color: var(--ink-2); font-size: 0.95rem; }
.path li { margin-bottom: 6px; }
.path li::marker { color: var(--accent); }

/* --- capabilities --- */
.caps { background: #fff; border-block: 1px solid var(--line); }
.caps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px 30px;
  margin-top: 8px;
}
.cap h4 { font-size: 1.02rem; margin-bottom: 8px; }
.cap p { color: var(--ink-2); font-size: 0.94rem; }

/* --- closing CTA --- */
.cta { text-align: center; }
.cta p { max-width: 44rem; margin: 0 auto 26px; color: var(--ink-2); }

/* --- footer --- */
.footer {
  border-top: 1px solid var(--line);
  padding: 26px 0;
  font-size: 0.85rem;
  color: var(--ink-2);
}
.footer-inner { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }

/* --- inner pages --- */
.page { padding: 56px 0 72px; }
.page h1 { font-size: clamp(1.9rem, 4.5vw, 2.6rem); margin-bottom: 12px; }
.page .lede { max-width: 46rem; color: var(--ink-2); font-size: 1.1rem; margin-bottom: 36px; }
.page h2 { font-size: 1.4rem; margin: 40px 0 10px; }
.page p, .page li { color: var(--ink-2); max-width: 46rem; }
.page ul { padding-left: 20px; margin: 10px 0; }
.diagram {
  background: var(--ink); color: #cfd8ea;
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 0.88rem;
  padding: 22px 26px; border-radius: 12px;
  overflow-x: auto; white-space: pre;
  margin: 22px 0;
}

/* --- responsive --- */
@media (max-width: 900px) {
  .surface-grid, .path-grid, .caps-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .surface-grid, .path-grid, .caps-grid, .legacy-grid { grid-template-columns: 1fr; }
  .nav nav a:not(.btn) { display: none; }
  section { padding: 52px 0; }
}