*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:       #f1f5f9;
  --surface:  #ffffff;
  --border:   #e2e8f0;
  --accent:   #2563eb;
  --accent-h: #1d4ed8;
  --text:     #0f172a;
  --muted:    #64748b;
  --danger:   #ef4444;
  --green:    #16a34a;
  --radius:   8px;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 13px;
  min-height: 100vh;
}

body.auth-page {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.auth-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px 36px;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
}

.auth-brand {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 28px;
  text-align: center;
}

.auth-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}

.auth-sub {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 28px;
}

.field {
  margin-bottom: 16px;
}
.field label {
  display: block;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--muted);
  margin-bottom: 5px;
}
.field input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  font-family: inherit;
  font-size: 13px;
  padding: 9px 12px;
  outline: none;
  transition: border-color .2s;
}
.field input:focus { border-color: var(--accent); }

.btn-primary {
  width: 100%;
  padding: 10px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 4px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s;
  margin-top: 8px;
}
.btn-primary:hover { background: var(--accent-h); }
.btn-primary:disabled { opacity: .5; cursor: not-allowed; }

.btn-secondary {
  width: 100%;
  padding: 9px;
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-family: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: border-color .15s, color .15s;
  margin-top: 8px;
}
.btn-secondary:hover { border-color: var(--accent); color: var(--text); }

.auth-link {
  text-align: center;
  margin-top: 18px;
  font-size: 12px;
  color: var(--muted);
}
.auth-link a { color: var(--accent); text-decoration: none; }
.auth-link a:hover { text-decoration: underline; }

.alert {
  padding: 10px 14px;
  border-radius: 4px;
  font-size: 12px;
  margin-bottom: 16px;
  display: none;
}
.alert.error   { background: rgba(239,68,68,.08); border: 1px solid rgba(239,68,68,.3); color: #b91c1c; display: block; }
.alert.success { background: rgba(22,163,74,.08);  border: 1px solid rgba(22,163,74,.3);  color: #15803d; display: block; }

.code-inputs {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin: 20px 0;
}
.code-inputs input {
  width: 44px;
  height: 52px;
  text-align: center;
  font-size: 22px;
  font-weight: 700;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  font-family: inherit;
  outline: none;
  transition: border-color .2s;
}
.code-inputs input:focus { border-color: var(--accent); }

.divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 20px 0;
  color: var(--muted);
  font-size: 11px;
}
.divider::before, .divider::after {
  content: '';
  flex: 1;
  border-top: 1px solid var(--border);
}

.qr-wrap { text-align: center; margin: 16px 0; }
.qr-wrap img { border: 4px solid var(--border); border-radius: 4px; width: 180px; height: 180px; }
.secret-key {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 8px 12px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
  text-align: center;
  word-break: break-all;
  margin: 10px 0;
}

.tab-row {
  display: flex;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 20px;
}
.tab-btn {
  flex: 1;
  padding: 9px;
  background: transparent;
  color: var(--muted);
  border: none;
  font-family: inherit;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: .05em;
  transition: background .15s, color .15s;
}
.tab-btn.active { background: var(--accent); color: #fff; }
.tab-btn:not(.active):hover { background: rgba(0,0,0,.04); color: var(--text); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }