:root { --bg: #0e0e10; --text: #efeff1; --accent: #9146ff; --muted: #adadb8; --card: #18181b; --border: #26262c; --red: #e53935; }
* { box-sizing: border-box; margin: 0; padding: 0; }
body { background: var(--bg); color: var(--text); font-family: 'Segoe UI', system-ui, sans-serif; min-height: 100vh; display: flex; flex-direction: column; }
.page { flex: 1; display: flex; align-items: center; justify-content: center; padding: 32px 16px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 36px 32px; width: 100%; max-width: 380px; }
.card-title { font-size: 1.25rem; font-weight: 700; color: var(--text); margin-bottom: 6px; text-align: center; }
.card-sub { font-size: 0.85rem; color: var(--muted); text-align: center; margin-bottom: 28px; line-height: 1.5; }
label { display: block; font-size: 0.8rem; color: var(--muted); margin-bottom: 6px; }
input[type="text"] {
  width: 100%; padding: 11px 14px; background: var(--bg); border: 1px solid var(--border);
  border-radius: 8px; color: var(--text); font-size: 0.95rem; font-family: 'Courier New', monospace;
  letter-spacing: .03em; transition: border-color .15s;
}
input[type="text"]:focus { outline: none; border-color: var(--accent); }
.submit-btn {
  display: block; width: 100%; margin-top: 16px; padding: 12px;
  background: var(--accent); color: #fff; border: none; border-radius: 8px;
  font-size: 0.9rem; font-weight: 700; cursor: pointer; transition: opacity .15s;
}
.submit-btn:hover { opacity: .85; }
.submit-btn:disabled { opacity: .5; cursor: not-allowed; }
.error-msg {
  font-size: 0.8rem; color: var(--red); background: rgba(229,57,53,.1);
  border: 1px solid rgba(229,57,53,.3); border-radius: 6px; padding: 8px 12px;
  text-align: center; margin-bottom: 16px; display: none;
}
.spinner { display: none; text-align: center; margin-top: 12px; font-size: 0.8rem; color: var(--muted); }