:root {
  --bg: #0a0e17;
  --card: #151c2e;
  --border: #232b42;
  --text: #e8eef7;
  --text-dim: #95a3bd;
  --text-muted: #5b6a87;
  --accent: #00d9c0;
  --accent-2: #6ae0ff;
  --gradient: linear-gradient(135deg, #00d9c0 0%, #6ae0ff 55%, #b084ff 100%);
}
* { box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, sans-serif;
  margin: 0; background: var(--bg); color: var(--text);
  line-height: 1.65; font-size: 15px;
}
body::before {
  content: ""; position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background:
    radial-gradient(ellipse 70% 50% at 20% 10%, rgba(0, 217, 192, 0.12), transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 30%, rgba(176, 132, 255, 0.10), transparent 60%);
}
header {
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: saturate(180%) blur(18px);
  background: rgba(10, 14, 23, 0.72);
  border-bottom: 1px solid var(--border);
}
.hdr-in { display: flex; align-items: center; justify-content: space-between; padding: 14px 20px; max-width: 900px; margin: 0 auto; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; text-decoration: none; color: var(--text); }
.logo-mark { width: 30px; height: 30px; border-radius: 8px; background: var(--gradient); display: grid; place-items: center; font-size: 16px; }
.back { color: var(--text-dim); text-decoration: none; font-size: 14px; }
.back:hover { color: var(--accent); }
main { position: relative; z-index: 1; max-width: 820px; margin: 0 auto; padding: 50px 20px 80px; }
h1 { font-size: clamp(28px, 4vw, 40px); font-weight: 800; letter-spacing: -0.01em; margin: 0 0 8px; }
.subtitle { color: var(--text-muted); font-size: 14px; margin-bottom: 36px; }
h2 { font-size: 20px; font-weight: 700; margin: 34px 0 12px; color: var(--text); }
h3 { font-size: 17px; font-weight: 600; margin: 22px 0 8px; color: var(--text); }
p, li { color: var(--text-dim); }
ul, ol { padding-left: 22px; }
li { margin: 4px 0; }
a { color: var(--accent-2); text-decoration: none; border-bottom: 1px dashed rgba(106, 224, 255, 0.3); }
a:hover { color: var(--accent); border-color: var(--accent); }
strong { color: var(--text); }
.note { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 16px 20px; margin: 20px 0; font-size: 14px; }
.contact-box { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 20px 22px; margin: 30px 0; }
.contact-box h3 { margin-top: 0; }
footer { border-top: 1px solid var(--border); padding: 30px 20px; color: var(--text-muted); font-size: 13px; text-align: center; position: relative; z-index: 1; }
footer a { color: var(--text-dim); border: 0; margin: 0 10px; }