/* plan.osiolog.com landing page: OsioPlan's own dark slate + mint */
:root {
  --bg: #0b1016; --surface: #111922; --surface2: #17212c; --line: #22303f;
  --text: #e4ebf2; --muted: #8193a8; --accent: #5ef0c8; --accent-ink: #052b22; --accent-soft: rgba(94,240,200,.12);
  font-family: "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font-size: 16px; line-height: 1.55; }
a { color: var(--accent); }
img { max-width: 100%; display: block; }

.top { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 12px 24px; background: rgba(11,16,22,.92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; font-size: 18px; }
.brand img { width: 32px; height: 32px; border-radius: 8px; }
.top nav { display: flex; align-items: center; gap: 18px; }
.top nav a { color: var(--muted); text-decoration: none; font-size: 14px; }
.top nav a:hover { color: var(--text); }

.btn { display: inline-flex; align-items: center; justify-content: center; height: 46px; padding: 0 22px; border-radius: 10px; background: var(--accent); color: var(--accent-ink); font-weight: 700; text-decoration: none; border: 1px solid var(--accent); }
.btn.small { height: 34px; padding: 0 14px; font-size: 14px; color: var(--accent-ink) !important; }
.btn.ghost { background: transparent; color: var(--accent); }
.btn.disabled { background: var(--surface2); color: var(--muted); border-color: var(--line); cursor: default; }

.hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr); gap: 40px; align-items: center; max-width: 1240px; margin: 0 auto; padding: 56px 24px 32px; }
.hero h1 { font-size: 40px; line-height: 1.15; margin: 0 0 18px; }
.hero h1 span { color: var(--accent); }
.hero p { color: #c4d0dc; }
.cta { display: flex; gap: 12px; flex-wrap: wrap; margin: 24px 0 12px; }
.note { font-size: 14px; color: var(--muted) !important; }
.hero-img img, .ver img { border-radius: 12px; border: 1px solid var(--line); }
figcaption { color: var(--muted); font-size: 13px; margin-top: 6px; }

.block { max-width: 1240px; margin: 0 auto; padding: 40px 24px; }
.block h2 { font-size: 28px; margin: 0 0 20px; }
.grid3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 20px 22px; }
.card h3 { margin: 0 0 8px; font-size: 18px; color: var(--accent); }
.card p { margin: 0; color: #c4d0dc; font-size: 15px; }
.versions { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.ver .sub { color: var(--muted); margin-bottom: 10px; }
.ver ul, .dl ol { padding-left: 20px; color: #c4d0dc; font-size: 15px; }
.ver li, .dl li { margin: 4px 0; }
.ver img { margin-top: 12px; }
.dl .btn { margin: 10px 0; }
.muted { color: var(--muted) !important; font-size: 14px !important; margin-top: 8px !important; }

.foot { max-width: 1240px; margin: 20px auto 0; padding: 28px 24px 48px; border-top: 1px solid var(--line); font-size: 14px; color: #c4d0dc; }

@media (max-width: 820px) {
  .top { padding: 10px 14px; }
  .top nav a:not(.btn) { display: none; }
  .hero { grid-template-columns: 1fr; padding: 28px 16px 8px; gap: 24px; }
  .hero h1 { font-size: 30px; }
  .block { padding: 28px 16px; }
  .grid3, .versions { grid-template-columns: 1fr; }
}