/* RedBeacon 官网样式 — 信标红主调，克制、有呼吸感 */
:root {
  --bg: #0e0d10;
  --bg-soft: #16151a;
  --card: #1c1b21;
  --line: #2a2930;
  --ink: #f4f2ef;
  --ink-soft: #b8b4ad;
  --ink-dim: #76726c;
  --beacon: #ff3d54;
  --beacon-2: #ff7a3d;
  --ok: #34d399;
  --radius: 16px;
  --maxw: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  --mono: "SF Mono", "JetBrains Mono", "Cascadia Code", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* nav */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(14, 13, 16, 0.78);
  backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: .2px; }
.brand .dot {
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--beacon);
  box-shadow: 0 0 0 0 rgba(255,61,84,.6);
  animation: pulse 2.4s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(255,61,84,.55); }
  70% { box-shadow: 0 0 0 14px rgba(255,61,84,0); }
  100% { box-shadow: 0 0 0 0 rgba(255,61,84,0); }
}
.nav-links { display: flex; gap: 26px; align-items: center; font-size: 14px; color: var(--ink-soft); }
.nav-links a:hover { color: var(--ink); }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px; border-radius: 999px; font-weight: 600; font-size: 14px;
  border: 1px solid transparent; cursor: pointer; transition: transform .12s ease, opacity .12s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: linear-gradient(120deg, var(--beacon), var(--beacon-2)); color: #fff; }
.btn-ghost { border-color: var(--line); color: var(--ink); background: transparent; }
.btn-block { width: 100%; justify-content: center; padding: 14px; font-size: 15px; }

/* hero */
.hero { padding: 96px 0 72px; position: relative; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: -40% 30% auto -10%; height: 520px;
  background: radial-gradient(closest-side, rgba(255,61,84,.18), transparent 70%);
  filter: blur(8px); pointer-events: none;
}
.tagline {
  display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--beacon);
  border: 1px solid rgba(255,61,84,.3); border-radius: 999px; padding: 6px 14px; margin-bottom: 26px;
  background: rgba(255,61,84,.06);
}
.hero h1 { font-size: clamp(34px, 5.4vw, 60px); line-height: 1.08; letter-spacing: -1px; font-weight: 800; }
.hero h1 .grad { background: linear-gradient(120deg, var(--beacon), var(--beacon-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.sub { margin-top: 22px; font-size: clamp(16px, 2vw, 19px); color: var(--ink-soft); max-width: 620px; }
.hero-cta { margin-top: 36px; display: flex; gap: 14px; flex-wrap: wrap; }
.hero-note { margin-top: 18px; font-size: 13px; color: var(--ink-dim); }

/* sections */
section { padding: 80px 0; border-top: 1px solid var(--line); }
.eyebrow { font-size: 13px; letter-spacing: 2px; text-transform: uppercase; color: var(--beacon); font-weight: 700; }
.h2 { font-size: clamp(26px, 3.4vw, 38px); font-weight: 800; letter-spacing: -.5px; margin: 12px 0 8px; }
.lead { color: var(--ink-soft); max-width: 640px; font-size: 17px; }

/* feature grid */
.grid { display: grid; gap: 18px; margin-top: 44px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; transition: border-color .2s ease, transform .2s ease;
}
.card:hover { border-color: rgba(255,61,84,.4); transform: translateY(-2px); }
.card .ico { font-size: 24px; }
.card h3 { font-size: 18px; margin: 14px 0 8px; }
.card p { color: var(--ink-soft); font-size: 15px; }

/* flow */
.flow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; margin-top: 40px; }
.step { background: var(--bg-soft); border: 1px solid var(--line); border-radius: 12px; padding: 18px 16px; position: relative; }
.step .n { font-family: var(--mono); font-size: 13px; color: var(--beacon); font-weight: 700; }
.step h4 { font-size: 15px; margin: 8px 0 4px; }
.step p { font-size: 13px; color: var(--ink-dim); }

/* philosophy list */
.princ { display: grid; gap: 16px; margin-top: 40px; }
.princ .row { display: grid; grid-template-columns: 200px 1fr; gap: 24px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.princ .row:last-child { border-bottom: none; }
.princ .k { font-weight: 700; font-size: 18px; }
.princ .v { color: var(--ink-soft); }

/* code block */
.code {
  background: #0a0a0c; border: 1px solid var(--line); border-radius: 12px; padding: 20px 22px;
  font-family: var(--mono); font-size: 14px; color: #d6d3cd; overflow-x: auto; line-height: 1.9;
}
.code .c { color: var(--ink-dim); }
.code .p { color: var(--beacon); }

/* pricing */
.price-card {
  max-width: 460px; margin: 44px auto 0; background: var(--card);
  border: 1px solid rgba(255,61,84,.35); border-radius: 20px; padding: 38px; text-align: center;
  box-shadow: 0 30px 80px -40px rgba(255,61,84,.5);
}
.price-card .amt { font-size: 56px; font-weight: 800; letter-spacing: -2px; }
.price-card .amt small { font-size: 20px; color: var(--ink-soft); font-weight: 600; }
.price-card .once { color: var(--ink-dim); font-size: 14px; margin-bottom: 24px; }
.feat { text-align: left; margin: 24px 0; display: grid; gap: 12px; }
.feat li { list-style: none; display: flex; gap: 10px; color: var(--ink-soft); font-size: 15px; }
.feat li::before { content: "✓"; color: var(--ok); font-weight: 800; }

/* buy/success page */
.panel { max-width: 560px; margin: 60px auto; }
.field { margin: 22px 0; }
.field label { display: block; font-size: 14px; color: var(--ink-soft); margin-bottom: 8px; }
.field input {
  width: 100%; padding: 14px 16px; border-radius: 12px; border: 1px solid var(--line);
  background: var(--bg-soft); color: var(--ink); font-family: var(--mono); font-size: 16px; letter-spacing: 1px;
}
.field input:focus { outline: none; border-color: var(--beacon); }
.hint { font-size: 13px; color: var(--ink-dim); margin-top: 8px; }
.msg { padding: 12px 16px; border-radius: 10px; font-size: 14px; margin: 14px 0; display: none; }
.msg.err { display: block; background: rgba(255,61,84,.1); border: 1px solid rgba(255,61,84,.4); color: #ff8e9b; }
.msg.ok { display: block; background: rgba(52,211,153,.1); border: 1px solid rgba(52,211,153,.4); color: var(--ok); }
.codebox {
  font-family: var(--mono); font-size: 15px; word-break: break-all; background: #0a0a0c;
  border: 1px dashed var(--beacon); border-radius: 12px; padding: 20px; margin: 16px 0; line-height: 1.7;
}

/* footer */
footer { padding: 48px 0; border-top: 1px solid var(--line); color: var(--ink-dim); font-size: 14px; }
footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }

@media (max-width: 820px) {
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .flow { grid-template-columns: 1fr 1fr; }
  .princ .row { grid-template-columns: 1fr; gap: 6px; }
  .nav-links a:not(.btn) { display: none; }
}