:root {
  --bg: #060818; --surface: #0e1230; --high: #161b42; --border: rgba(255, 255, 255, 0.14);
  --text: #fff; --text2: #b4bad9; --muted: #7a80a8; --violet: #8b2cf5; --blue: #3b5bff;
  --gold: #ffc53d; --danger: #ef4444; --success: #22c55e;
  color-scheme: dark;
}
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, Roboto, sans-serif; font-size: 17px;
  background:
    radial-gradient(700px 400px at 100% 0%, rgba(59, 91, 255, 0.25), transparent 60%),
    radial-gradient(600px 400px at 0% 100%, rgba(139, 44, 245, 0.25), transparent 60%),
    var(--bg);
}
a { color: #67e8f9; }
.wrap { max-width: 520px; margin: 0 auto; padding: 22px 16px 40px; }
.brand { display: flex; align-items: center; justify-content: center; gap: 10px; margin: 6px 0 22px; }
.logo { width: 44px; height: 44px; filter: drop-shadow(0 0 12px rgba(139, 44, 245, 0.8)); }
.name { font-weight: 900; font-style: italic; font-size: 25px; letter-spacing: 0.5px; }
.k4 { background: linear-gradient(180deg, #ffd66e, #ff9500); -webkit-background-clip: text; color: transparent; }
.card {
  background: rgba(14, 18, 48, 0.92); border: 1px solid var(--border); border-radius: 22px;
  padding: 24px 20px; box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
}
.card.center { text-align: center; }
h1 { font-size: 24px; margin: 0 0 8px; }
.muted { color: var(--text2); line-height: 1.5; margin: 0 0 16px; }
.form { display: flex; flex-direction: column; gap: 14px; }
label { display: flex; flex-direction: column; gap: 6px; color: var(--text2); font-size: 15px; }
input {
  font: inherit; color: var(--text); background: var(--high); border: 1px solid var(--border);
  border-radius: 14px; padding: 14px 15px; width: 100%; outline: none;
}
input:focus { border-color: var(--violet); box-shadow: 0 0 0 3px rgba(139, 44, 245, 0.3); }
input.big { font-size: 30px; text-align: center; letter-spacing: 6px; font-weight: 800; }
input.code { font-size: 22px; letter-spacing: 3px; text-transform: uppercase; }
.check { flex-direction: row; align-items: flex-start; gap: 10px; color: var(--text2); }
.check input { width: 22px; height: 22px; flex-shrink: 0; margin-top: 2px; }
.btn {
  font: inherit; font-weight: 700; border: none; border-radius: 14px; padding: 15px; cursor: pointer;
  color: #fff;
}
.btn.primary {
  background: linear-gradient(90deg, var(--violet), var(--blue));
  box-shadow: 0 0 18px rgba(139, 44, 245, 0.5);
}
.btn:disabled { opacity: 0.6; }
.error { color: #fca5a5; margin: 6px 0 0; }
.tabs { display: flex; gap: 8px; margin-bottom: 18px; background: var(--high); padding: 5px; border-radius: 14px; }
.tab {
  flex: 1; font: inherit; color: var(--text2); background: none; border: none; padding: 11px;
  border-radius: 10px; cursor: pointer; font-weight: 600;
}
.tab.active { background: linear-gradient(90deg, var(--violet), var(--blue)); color: #fff; }
.ok {
  width: 84px; height: 84px; margin: 6px auto 14px; border-radius: 50%; display: grid; place-items: center;
  font-size: 46px; font-weight: 900; background: rgba(34, 197, 94, 0.18); color: #4ade80;
  border: 2px solid rgba(74, 222, 128, 0.6); box-shadow: 0 0 24px rgba(34, 197, 94, 0.4);
}
.foot { text-align: center; color: var(--muted); font-size: 13px; margin-top: 26px; }
.legal h2 { font-size: 19px; margin: 22px 0 6px; }
.legal p, .legal li { color: var(--text2); line-height: 1.6; }
.notice { background: rgba(245, 158, 11, 0.12); border: 1px solid rgba(245, 158, 11, 0.45); color: #fde68a;
  border-radius: 12px; padding: 10px 12px; font-size: 14px; }

[hidden] { display: none !important; }