:root {
  color-scheme: light;
  --background: #f7f8fa;
  --foreground: #202124;
  --card: #ffffff;
  --card-foreground: #202124;
  --primary: #202124;
  --primary-foreground: #ffffff;
  --muted: #eef0f2;
  --muted-foreground: #6b7078;
  --accent: #e2f1ec;
  --accent-foreground: #173f34;
  --destructive: #b3261e;
  --border: #dfe2e6;
  --input: #c8ccd1;
  --ring: #247a63;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  min-width: 320px;
  min-height: 100%;
  margin: 0;
}

body {
  background: var(--background);
  color: var(--foreground);
  font-family: Inter, Pretendard, "Noto Sans KR", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input {
  font: inherit;
}

button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
}

[hidden] {
  display: none !important;
}

.auth-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.auth-shell {
  width: min(100%, 420px);
  padding: 32px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  color: var(--card-foreground);
  box-shadow: 0 12px 32px color-mix(in srgb, var(--foreground) 14%, transparent);
}

.auth-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 32px;
}

.auth-brand-mark {
  width: 36px;
  height: 36px;
  display: inline-grid;
  place-items: center;
  border-radius: 8px;
  background: var(--primary);
  color: var(--primary-foreground);
  font-size: 17px;
  font-weight: 700;
}

.auth-brand-name {
  font-size: 16px;
  font-weight: 700;
}

.auth-form {
  display: grid;
  gap: 20px;
}

.auth-heading h1 {
  margin: 0;
  font-size: 24px;
  line-height: 1.3;
  letter-spacing: 0;
}

.form-field {
  display: grid;
  gap: 7px;
}

.form-field label {
  font-size: 13px;
  font-weight: 600;
}

.form-field input {
  width: 100%;
  min-height: 42px;
  padding: 9px 11px;
  border: 1px solid var(--input);
  border-radius: 6px;
  background: var(--card);
  color: var(--card-foreground);
}

.form-field input:hover {
  border-color: var(--muted-foreground);
}

.form-field input:focus {
  border-color: var(--ring);
}

.auth-actions {
  display: grid;
  gap: 10px;
  margin-top: 4px;
}

.btn {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card);
  color: var(--card-foreground);
  cursor: pointer;
}

.btn:hover:not(:disabled) {
  background: var(--accent);
  color: var(--accent-foreground);
}

.btn:disabled {
  cursor: wait;
  opacity: 0.55;
}

.btn-primary {
  border-color: var(--primary);
  background: var(--primary);
  color: var(--primary-foreground);
}

.btn-primary:hover:not(:disabled) {
  background: color-mix(in srgb, var(--primary) 88%, var(--background));
  color: var(--primary-foreground);
}

.dialog-backdrop {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgb(32 33 36 / 36%);
}

.error-dialog,
.signup-success-dialog {
  width: min(100%, 380px);
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #ffffff;
  color: var(--card-foreground);
  box-shadow: 0 18px 48px rgb(32 33 36 / 24%);
}

.error-dialog p,
.signup-success-dialog p {
  margin: 0 0 22px;
  color: var(--muted-foreground);
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.error-dialog .btn,
.signup-success-dialog .btn {
  width: 100%;
}

@media (max-width: 520px) {
  .auth-page {
    padding: 16px;
  }

  .auth-shell {
    padding: 24px 20px;
  }
}