:root {
  color-scheme: light dark;
  --bg: #f4f7fb;
  --surface: #ffffff;
  --text: #182033;
  --muted: #647086;
  --border: #dfe5ef;
  --accent: #3659d9;
  --accent-text: #ffffff;
  --success-bg: #eefbf3;
  --success-border: #b7e6c7;
  --success-text: #146b35;
  --danger-bg: #fff5f5;
  --danger-border: #f0c5c5;
  --danger-text: #9b2c2c;
  --shadow: 0 20px 60px rgba(32, 47, 75, 0.10);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #10141d;
    --surface: #181e29;
    --text: #f1f4f9;
    --muted: #a8b1c2;
    --border: #2b3444;
    --accent: #7e98ff;
    --accent-text: #0c142d;
    --success-bg: #10251a;
    --success-border: #275b3a;
    --success-text: #9de0b3;
    --danger-bg: #2a1719;
    --danger-border: #613034;
    --danger-text: #ffb1b7;
    --shadow: 0 20px 60px rgba(0, 0, 0, 0.28);
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.shell {
  width: min(100%, 620px);
  padding: clamp(28px, 6vw, 52px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.brand {
  display: inline-flex;
  padding: 7px 11px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 750;
  letter-spacing: .03em;
}

h1 { margin: 22px 0 28px; font-size: clamp(30px, 6vw, 44px); letter-spacing: -0.04em; }
h2 { margin: 18px 0 8px; font-size: 25px; }
.muted { margin: 0; color: var(--muted); line-height: 1.6; }

.session-state {
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: 18px;
}

.session-state.authenticated {
  background: var(--success-bg);
  border-color: var(--success-border);
}

.session-state.guest {
  background: var(--danger-bg);
  border-color: var(--danger-border);
}

.status-line {
  margin: 0 0 14px;
  font-size: 17px;
  font-weight: 800;
}

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

.identity-list {
  margin: 22px 0 0;
  display: grid;
  gap: 10px;
}
.identity-list div { display: grid; grid-template-columns: 170px 1fr; gap: 12px; }
dt { color: var(--muted); }
dd { margin: 0; font-weight: 650; overflow-wrap: anywhere; }

.exclusive-card {
  margin-top: 24px;
  padding: 18px;
  border: 1px solid var(--success-border);
  border-radius: 14px;
  background: var(--surface);
}
.exclusive-card p { margin: 0; line-height: 1.55; }
.exclusive-card p + p { margin-top: 8px; }
.exclusive-title { font-weight: 800; }
.exclusive-ok { color: var(--success-text); font-weight: 700; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  margin-top: 20px;
  border-radius: 12px;
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 750;
  text-decoration: none;
}
.button-secondary { background: transparent; color: var(--text); border: 1px solid var(--border); }
footer { margin-top: 28px; color: var(--muted); font-size: 12px; }

@media (max-width: 520px) {
  .identity-list div { grid-template-columns: 1fr; gap: 2px; }
}