:root {
  --bg: #0a0a0a;
  --bg-grad: radial-gradient(circle at 50% 0%, #141414 0%, #0a0a0a 45%, #000000 100%);
  --card: #121212;
  --card-2: #1a1a1a;
  --border: rgba(255, 255, 255, 0.08);
  --navy: #0d1b2a;
  --navy-2: #0a1628;
  --text: #ffffff;
  --text-dim: #b0b0b0;
  --text-dim-2: #d0d0d0;
  --input-bg: #161616;
  --danger: #ef4444;
  --success: #22c55e;
  --radius: 14px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg-grad);
  background-color: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  min-height: 100vh;
}

/* ── Navbar ── */
.navbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.navbar-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 15px;
}

.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(160deg, var(--navy), var(--navy-2));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 800;
  border: 1px solid var(--border);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-dim-2);
  text-decoration: none;
  font-size: 13px;
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  transition: border-color .15s ease, color .15s ease, background .15s ease;
  white-space: nowrap;
}

.nav-link:hover {
  color: #fff;
  border-color: rgba(255,255,255,0.18);
  background: rgba(255,255,255,0.03);
}

.nav-link--cta {
  background: var(--navy-2);
  border-color: transparent;
  color: #fff;
}

.nav-link--cta:hover {
  background: #0f1e30;
}

.tg-icon { width: 16px; height: 16px; flex-shrink: 0; }

/* ── Page layout ── */
.page {
  max-width: 560px;
  margin: 0 auto;
  padding: 48px 20px 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero {
  text-align: center;
  margin-bottom: 28px;
}

.hero h1 {
  font-size: 28px;
  margin: 0 0 8px;
  letter-spacing: -0.02em;
}

.subheading {
  color: var(--text-dim);
  font-size: 14px;
  margin: 0;
  line-height: 1.5;
}

/* ── Card ── */
.card {
  width: 100%;
  background: linear-gradient(180deg, var(--card-2), var(--card));
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.45);
}

.card-head { margin-bottom: 18px; }

.card-head h2 {
  font-size: 17px;
  margin: 0 0 4px;
}

.card-head p {
  font-size: 13px;
  color: var(--text-dim);
  margin: 0;
}

/* ── Panels / fields ── */
.panel { display: flex; flex-direction: column; gap: 10px; }

.field-label {
  font-size: 12.5px;
  color: var(--text-dim-2);
  margin-bottom: 2px;
}

.field-hint {
  font-size: 12px;
  color: var(--text-dim);
  margin: -4px 0 4px;
  line-height: 1.5;
}

.field-input {
  width: 100%;
  padding: 13px 14px;
  border-radius: 12px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  color: #fff;
  font-size: 15px;
  outline: none;
  transition: border-color .15s ease;
}

.field-input::placeholder { color: #6b6b6b; }
.field-input:focus { border-color: rgba(255,255,255,0.28); }

.btn-primary {
  margin-top: 6px;
  width: 100%;
  padding: 13px 14px;
  border-radius: 12px;
  border: none;
  background: #ffffff;
  color: #000;
  font-size: 14.5px;
  font-weight: 700;
  cursor: pointer;
  transition: transform .1s ease, opacity .15s ease;
}

.btn-primary:hover { opacity: 0.9; }
.btn-primary:active { transform: scale(0.99); }
.btn-primary:disabled { opacity: 0.55; cursor: not-allowed; }

.btn-secondary {
  width: 100%;
  padding: 11px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim-2);
  font-size: 13.5px;
  cursor: pointer;
}

.btn-secondary:hover { color: #fff; border-color: rgba(255,255,255,0.2); }

/* ── State area ── */
.state-area {
  margin-top: 8px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
  text-align: center;
}

.state-status {
  font-size: 13px;
  color: var(--text-dim);
}

.state-status--error { color: var(--danger); }
.state-status--success { color: var(--success); }

.code-display {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: #fff;
  background: var(--input-bg);
  border: 1px solid var(--border);
  padding: 12px 18px;
  border-radius: 10px;
  width: 100%;
}

.code-hint {
  font-size: 12.5px;
  color: var(--text-dim);
  line-height: 1.5;
}

.copy-btn {
  padding: 8px 14px;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim-2);
  font-size: 12.5px;
  cursor: pointer;
}

.copy-btn:hover { color: #fff; border-color: rgba(255,255,255,0.2); }

.session-id-display {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.03em;
}

.spinner {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.15);
  border-top-color: #fff;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ── Divider ── */
.divider {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 20px 0 14px;
  color: #555;
  font-size: 12px;
}

.divider::before, .divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ── Telegram link ── */
.telegram-link {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  color: var(--text-dim-2);
  text-decoration: none;
  font-size: 13.5px;
  font-weight: 600;
  transition: border-color .15s ease, color .15s ease;
}

.telegram-link:hover { color: #fff; border-color: rgba(255,255,255,0.2); }

/* ── Footer ── */
.footer {
  margin-top: 24px;
  font-size: 12px;
  color: #555;
  text-align: center;
}

@media (max-width: 420px) {
  .page { padding: 32px 14px 24px; }
  .hero h1 { font-size: 24px; }
  .card { padding: 18px; border-radius: 14px; }
}