:root {
  --bg-page: #0f1117;
  --bg-surface: #181c27;
  --bg-surface2: #1e2333;
  --bg-hover: #252a3a;
  --border: #2a2f3d;
  --border-sub: #3a4258;
  --text-primary: #e8eaf0;
  --text-secondary: #8b92a5;
  --text-muted: #4b5263;
  --red-bg: #1f0f0f;
  --red-border: #5c1a1a;
  --red-text: #f09595;
  --green-bg: #071a12;
  --green-border: #0d4d2e;
  --green-text: #5DCAA5;
}

:root[data-theme="light"] {
  --bg-page: #f3f6fb;
  --bg-surface: #ffffff;
  --bg-surface2: #f7f9fd;
  --bg-hover: #edf2f8;
  --border: #d8e0ec;
  --border-sub: #e2e8f0;
  --text-primary: #1f2937;
  --text-secondary: #4b5563;
  --text-muted: #6b7280;
  --red-bg: #fff1f1;
  --red-border: #f4c7c7;
  --red-text: #b42318;
  --green-bg: #edfdf5;
  --green-border: #b6efd1;
  --green-text: #0f7a49;
}

body {
  background: var(--bg-page);
  min-height: 100vh;
  min-height: 100dvh;
}

.theme-toggle-btn {
  position: fixed;
  top: 0.9rem;
  right: 0.9rem;
  z-index: 60;
  width: 2rem;
  height: 2rem;
  border-radius: 0.5rem;
  border: 0.5px solid var(--border);
  background: var(--bg-surface2);
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}
.theme-toggle-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}
.flash-auth-success {
  background: #071a12;
  border: 0.5px solid #0d4d2e;
  color: #5DCAA5;
}
.flash-auth-error {
  background: #1f0f0f;
  border: 0.5px solid #5c1a1a;
  color: #f09595;
}

/* ============================================================
   임무17 · Auth 페이지 공통 모바일 대응
   ============================================================ */
@media (max-width: 640px) {
  body { padding: 16px 12px; }
  input, select, button {
    min-height: 44px;
    font-size: 16px; /* iOS 자동 zoom 방지 */
  }
}