:root {
  --bg: #0b1014;
  --fg: #e6edf3;
  --muted: #8b949e;
  --accent: #4ade80;
  --accent2: #22d3ee;
  --card: #161b22;
  --border: #21262d;
  --danger: #f87171;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--fg); font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", system-ui, sans-serif; line-height: 1.55; }
a { color: var(--accent2); text-decoration: none; }
a:hover { color: var(--accent); }
code, pre { font-family: "SF Mono", Menlo, Monaco, "Cascadia Code", monospace; font-size: 13px; }
pre { background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 14px 16px; overflow-x: auto; }
input, textarea, button { font-family: inherit; font-size: inherit; }

header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px 32px;
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0;
  background: rgba(11, 16, 20, 0.85);
  backdrop-filter: blur(10px);
  z-index: 10;
}
header .brand {
  font-size: 18px; font-weight: 700;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
header nav { display: flex; gap: 20px; align-items: center; }
header nav a { color: var(--muted); font-size: 14px; }
header nav a:hover { color: var(--fg); }
header nav a.cta {
  background: var(--accent);
  color: #0b1014;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 6px;
}
header nav a.cta:hover { background: #5cf094; }

main { max-width: 720px; margin: 0 auto; padding: 60px 24px 80px; }
.hero h1 {
  font-size: 56px; line-height: 1.05; margin: 0 0 12px;
  letter-spacing: -1.5px; font-weight: 800;
}
.hero .tag { color: var(--muted); font-size: 22px; margin: 0 0 36px; }

.address-demo {
  display: flex; align-items: center; background: var(--card);
  border: 1px solid var(--border); border-radius: 10px;
  padding: 6px; margin-bottom: 8px;
}
.address-demo .prefix {
  color: var(--muted); padding: 10px 4px 10px 14px; font-family: "SF Mono", monospace; font-size: 16px;
}
.address-demo input {
  flex: 1; background: transparent; border: none; outline: none;
  color: var(--fg); padding: 10px 4px; font-size: 16px;
  font-family: "SF Mono", monospace;
}
.address-demo button {
  background: var(--accent); color: #0b1014; border: none;
  padding: 10px 22px; border-radius: 6px;
  font-weight: 700; cursor: pointer;
}
.address-demo button:hover { background: #5cf094; }
.sub { color: var(--muted); font-size: 13px; margin: 0 0 48px; }

.how, .why, .cli { margin: 56px 0; }
.how h2, .why h2, .cli h2 {
  font-size: 14px; text-transform: uppercase; letter-spacing: 1.5px;
  color: var(--muted); margin: 0 0 18px;
}
.steps { display: grid; gap: 12px; }
.step { background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 14px 18px; font-size: 15px; }
.step b { color: var(--accent); margin-right: 6px; }
.why p { color: var(--muted); font-size: 15px; margin: 0; }

footer {
  border-top: 1px solid var(--border);
  padding: 24px 32px;
  display: flex; justify-content: space-between;
  color: var(--muted); font-size: 13px;
}
footer a { color: var(--muted); margin-left: 14px; }
footer a:hover { color: var(--accent); }

/* Forms */
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; padding: 28px;
  margin-top: 24px;
}
.card h2 { margin: 0 0 18px; font-size: 20px; }
.field { margin-bottom: 16px; }
.field label { display: block; color: var(--muted); font-size: 13px; margin-bottom: 6px; }
.field input, .field textarea {
  width: 100%; background: var(--bg); border: 1px solid var(--border);
  color: var(--fg); padding: 10px 12px; border-radius: 6px;
  font-family: inherit; font-size: 15px;
}
.field input:focus, .field textarea:focus { outline: none; border-color: var(--accent); }
.btn {
  background: var(--accent); color: #0b1014; border: none;
  padding: 10px 22px; border-radius: 6px;
  font-weight: 700; cursor: pointer; font-size: 15px;
}
.btn:hover { background: #5cf094; }
.btn:disabled { background: var(--border); color: var(--muted); cursor: not-allowed; }
.btn.ghost {
  background: transparent; color: var(--fg);
  border: 1px solid var(--border);
}
.btn.ghost:hover { border-color: var(--accent); color: var(--accent); }

.error { color: var(--danger); font-size: 14px; margin-top: 10px; }
.success { color: var(--accent); font-size: 14px; margin-top: 10px; }

.token-box {
  background: var(--bg); border: 2px solid var(--accent);
  border-radius: 8px; padding: 16px; margin: 16px 0;
  font-family: "SF Mono", monospace; font-size: 13px;
  word-break: break-all;
}
.warn {
  background: rgba(248, 113, 113, 0.1);
  border: 1px solid var(--danger);
  color: var(--danger);
  padding: 10px 14px; border-radius: 6px; font-size: 13px;
  margin-top: 12px;
}

/* Inbox */
.msg-list { display: grid; gap: 8px; }
.msg {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 8px; padding: 14px 18px; cursor: pointer;
  transition: border-color 0.15s;
}
.msg:hover { border-color: var(--accent2); }
.msg.unread { border-left: 3px solid var(--accent); }
.msg-head { display: flex; justify-content: space-between; gap: 12px; margin-bottom: 4px; }
.msg-from { font-weight: 600; color: var(--fg); font-size: 14px; }
.msg-time { color: var(--muted); font-size: 12px; white-space: nowrap; }
.msg-subject { color: var(--fg); font-size: 14px; margin-bottom: 4px; }
.msg-preview { color: var(--muted); font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.profile-card { text-align: center; }
.profile-card h1 { font-size: 36px; margin: 0 0 4px; }
.profile-card .handle { color: var(--muted); font-family: "SF Mono", monospace; }
.profile-card .bio { color: var(--fg); margin: 18px 0 0; }

@media (max-width: 600px) {
  .hero h1 { font-size: 42px; }
  main { padding: 40px 18px 60px; }
  header { padding: 14px 18px; }
}