/* D3LTool site (v2.2 redesign) — NASA deep-space landing style.
   Used by index.html / index-cn.html only; the documentation and
   download pages keep the classic Cayman stylesheets. */

:root {
  --nasa-blue: #0b3d91;
  --nasa-deep: #071629;
  --nasa-red: #fc3d21;
  --ink: #1f2937;
  --muted: #57606a;
  --line: #e4e9f0;
  --bg-soft: #f6f8fb;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
               "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC",
               Arial, sans-serif;
  color: var(--ink);
  background: #fff;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--nasa-blue); text-decoration: none; }
a:hover { color: var(--nasa-red); }

code, pre { font-family: "Cascadia Code", Consolas, Menlo, monospace; }

.wrap { max-width: 1020px; margin: 0 auto; padding: 0 20px; }
section { padding: 44px 0 6px; }

.kicker {
  color: var(--nasa-red);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2.5px;
  text-transform: uppercase;
}
h2 { font-size: 26px; margin: 6px 0 18px; }
.section-lede { color: var(--muted); max-width: 660px; margin-bottom: 20px; }

/* ------------------------------------------------ hero */
.hero {
  position: relative;
  overflow: hidden;
  color: #fff;
  text-align: center;
  padding: 88px 20px 80px;
  background: radial-gradient(1100px 480px at 50% -160px, #1d4fa7 0%, transparent 62%),
              linear-gradient(165deg, var(--nasa-deep) 0%, #0b2a5b 55%, var(--nasa-blue) 100%);
}
.hero::before {
  content: "";
  position: absolute; inset: 0; pointer-events: none;
  background-image:
    radial-gradient(1.5px 1.5px at 8% 24%,  rgba(255,255,255,.85) 50%, transparent 51%),
    radial-gradient(1px 1px    at 17% 66%,  rgba(255,255,255,.45) 50%, transparent 51%),
    radial-gradient(2px 2px    at 26% 18%,  rgba(255,255,255,.75) 50%, transparent 51%),
    radial-gradient(1px 1px    at 35% 78%,  rgba(255,255,255,.5) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 44% 34%, rgba(255,255,255,.8) 50%, transparent 51%),
    radial-gradient(1px 1px    at 55% 12%,  rgba(255,255,255,.55) 50%, transparent 51%),
    radial-gradient(2px 2px    at 63% 58%,  rgba(255,255,255,.7) 50%, transparent 51%),
    radial-gradient(1px 1px    at 72% 30%,  rgba(255,255,255,.5) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 81% 72%, rgba(255,255,255,.8) 50%, transparent 51%),
    radial-gradient(1px 1px    at 90% 40%,  rgba(255,255,255,.6) 50%, transparent 51%),
    radial-gradient(2px 2px    at 96% 14%,  rgba(255,255,255,.7) 50%, transparent 51%);
}
.hero .orbit {
  position: absolute;
  width: 920px; height: 920px;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 50%;
  top: -430px; right: -280px;
  transform: rotate(-16deg);
  pointer-events: none;
}
.hero .orbit::after {
  content: "";
  position: absolute;
  width: 9px; height: 9px;
  background: var(--nasa-red);
  border-radius: 50%;
  top: 30px; left: 132px;
  box-shadow: 0 0 14px 3px rgba(252,61,33,.85);
}
.hero > .inner { position: relative; }

.hero h1 {
  font-size: 54px;
  letter-spacing: 1px;
  margin-bottom: 2px;
}
.hero .tagline {
  font-size: 20px;
  color: rgba(255,255,255,.88);
  margin-bottom: 16px;
}
.hero .lede {
  max-width: 640px;
  margin: 0 auto 22px;
  color: rgba(255,255,255,.82);
  font-size: 15.5px;
}
.badges { margin-bottom: 26px; }
.badge {
  display: inline-block;
  margin: 3px 4px;
  padding: 3px 12px;
  font-size: 12.5px;
  border-radius: 999px;
  background: rgba(255,255,255,.13);
  border: 1px solid rgba(255,255,255,.25);
  color: rgba(255,255,255,.92);
}
.cta .btn-hero {
  display: inline-block;
  margin: 4px 6px;
  padding: 11px 26px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 15px;
  background: #fff;
  color: var(--nasa-blue);
  transition: transform .15s ease, box-shadow .15s ease;
}
.cta .btn-hero:hover {
  color: var(--nasa-red);
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(0,0,0,.35);
}
.cta .btn-ghost {
  display: inline-block;
  margin: 4px 6px;
  padding: 11px 26px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 15px;
  color: #fff;
  border: 1px solid rgba(255,255,255,.55);
  transition: background .15s ease;
}
.cta .btn-ghost:hover { background: rgba(255,255,255,.14); color: #fff; }

.nav {
  position: relative;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 48px;
  font-size: 14px;
}
.nav a { color: rgba(255,255,255,.8); }
.nav a:hover { color: #fff; }
.nav .brand { font-weight: 700; color: #fff; letter-spacing: .5px; }

/* ------------------------------------------------ cards */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 16px;
}
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 16px;
  transition: transform .15s ease, box-shadow .15s ease;
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 34px rgba(11,29,58,.10);
}
.card .ico { font-size: 22px; }
.card h3 { font-size: 15px; margin: 8px 0 4px; }
.card p { font-size: 13.5px; color: var(--muted); }

/* wide highlight cards (MCP / AI drawer) */
.card.wide { grid-column: span 2; }
@media (max-width: 620px) { .card.wide { grid-column: span 1; } }
.card.wide code { background: var(--bg-soft); padding: 1px 6px; border-radius: 5px; }

/* ------------------------------------------------ screenshot */
.shot {
  display: block;
  margin: 8px auto 4px;
  max-width: 880px;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 24px 60px rgba(11,29,58,.18);
}
figcaption { text-align: center; color: var(--muted); font-size: 13px; margin-top: 10px; }

/* ------------------------------------------------ steps */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 16px; }
.step {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 16px;
}
.step .n {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 27px; height: 27px;
  border-radius: 50%;
  background: var(--nasa-blue);
  color: #fff;
  font-weight: 700;
  font-size: 14px;
}
.step h3 { display: inline; font-size: 15px; margin-left: 8px; }
.step p { font-size: 13.5px; color: var(--muted); margin-top: 8px; }

pre.term {
  background: #0d1117;
  color: #e6edf3;
  padding: 14px 16px;
  border-radius: 10px;
  font-size: 13px;
  overflow-x: auto;
  margin-top: 16px;
  line-height: 1.8;
}
pre.term .c { color: #8b949e; }
pre.term .k { color: #7ee787; }

/* ------------------------------------------------ text sections */
.small { font-size: 12.5px; color: var(--muted); }
.small p { margin: 6px 0; }
.small a { text-decoration: underline; }

ul.plain { list-style: none; }
ul.plain li { margin: 6px 0; }

/* guide subsections */
h3.sub {
  font-size: 17px;
  margin: 26px 0 6px;
}
#guide .steps { margin-bottom: 10px; }

/* ------------------------------------------------ footer */
.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 40px;
  padding: 26px 20px 40px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}
.site-footer a { text-decoration: underline; }