:root {
  --ink: #15282f;
  --muted: #64767d;
  --teal: #008ca0;
  --teal-accent: #14c6c5;
  --teal-strong: #006d7d;
  --line: #dce6e8;
  --surface: #ffffff;
  --bg: #f3f8f9;
  --danger: #c0392b;
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC",
    "Microsoft JhengHei", sans-serif;
  letter-spacing: 0;
}

.auth-shell {
  width: min(440px, calc(100vw - 32px));
  margin: 32px auto;
}

.auth-card {
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 16px 44px rgba(0, 47, 58, 0.09);
}

.auth-accent {
  height: 5px;
  background: linear-gradient(90deg, var(--teal), var(--teal-accent));
}

.auth-body {
  padding: 32px 30px 28px;
}

.brand {
  display: flex;
  justify-content: center;
  margin-bottom: 24px;
}

.brand img {
  width: 220px;
  max-width: 100%;
  height: auto;
  display: block;
  box-sizing: border-box;
  padding: 24px 32px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--teal), var(--teal-accent));
}

.auth-title {
  margin: 0 0 6px;
  font-size: 24px;
  line-height: 1.25;
  font-weight: 700;
  text-align: center;
}

.auth-subtitle {
  margin: 0 0 22px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
  text-align: center;
}

.social-grid {
  display: grid;
  gap: 10px;
}

.social-button {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--ink);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: border-color 120ms ease, background 120ms ease;
}

.social-button:hover {
  border-color: var(--teal);
  background: #f7fbfc;
}

.social-button.facebook {
  border-color: #1877f2;
  background: #1877f2;
  color: #ffffff;
}

.social-button.facebook:hover {
  background: #1166d1;
}

.social-button svg {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
}

.auth-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 22px 0 18px;
  color: var(--muted);
  font-size: 12px;
}

.auth-divider::before,
.auth-divider::after {
  content: "";
  height: 1px;
  flex: 1 1 auto;
  background: var(--line);
}

.field {
  display: grid;
  gap: 7px;
  margin-bottom: 14px;
}

.field label {
  color: var(--ink);
  font-size: 13px;
  font-weight: 600;
}

.field input {
  width: 100%;
  height: 44px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fbfdfd;
  color: var(--ink);
  font-size: 15px;
  outline: none;
}

.field input:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(0, 140, 160, 0.14);
  background: #ffffff;
}

.primary-button {
  width: 100%;
  height: 46px;
  margin-top: 6px;
  border: 0;
  border-radius: 6px;
  background: var(--teal);
  color: #ffffff;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
}

.primary-button:hover {
  background: var(--teal-strong);
}

.auth-error {
  margin: 0 0 16px;
  padding: 10px 12px;
  border: 1px solid #f1c4be;
  border-radius: 6px;
  background: #fff3f1;
  color: var(--danger);
  font-size: 13px;
  line-height: 1.5;
}

.auth-error-detail {
  display: grid;
  gap: 10px;
  padding: 14px 14px 16px;
  border-color: #f0b8b0;
  background: #fff6f4;
}

.auth-success {
  margin: 0 0 16px;
  padding: 10px 12px;
  border: 1px solid #bfe7d8;
  border-radius: 6px;
  background: #f0fbf6;
  color: #146b4b;
  font-size: 13px;
  line-height: 1.5;
}

.auth-error-detail p {
  margin: 0;
  color: var(--ink);
  font-size: 13px;
  line-height: 1.6;
}

.auth-error-title {
  color: var(--danger);
  font-size: 15px;
  line-height: 1.4;
}

.auth-error-steps {
  display: grid;
  gap: 6px;
  margin: 0;
  padding-left: 20px;
  color: var(--ink);
  font-size: 13px;
  line-height: 1.5;
}

.store-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 2px;
}

.store-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--teal-strong);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  transition: border-color 120ms ease, background 120ms ease;
}

.store-link:hover {
  border-color: var(--teal);
  background: #f3fbfc;
}

.auth-note {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.6;
  text-align: center;
}

.auth-link {
  color: var(--teal-strong);
  font-weight: 700;
  text-decoration: none;
}

.auth-link:hover {
  text-decoration: underline;
}

.auth-field-link {
  margin: -4px 0 14px;
  font-size: 13px;
  text-align: right;
}

.hp-field {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.auth-confirm-email {
  margin: 0 0 14px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fbfdfd;
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  text-align: center;
  overflow-wrap: anywhere;
}

.auth-confirm-warning {
  margin: 0 0 20px;
  padding: 10px 12px;
  border: 1px solid #f0e4a8;
  border-radius: 6px;
  background: #fffcf2;
  color: #6a5417;
  font-size: 13px;
  line-height: 1.6;
}

.scope-list {
  display: grid;
  gap: 8px;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
}

.scope-list li {
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fbfdfd;
  color: var(--ink);
  font-size: 14px;
}

.button-row {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 10px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 16px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
}

.button.primary {
  border-color: var(--teal);
  background: var(--teal);
  color: #ffffff;
}

.button.primary:hover {
  background: var(--teal-strong);
}

.resend-button {
  width: 100%;
  margin-top: 10px;
}

@media (max-width: 480px) {
  .auth-body {
    padding: 26px 20px 24px;
  }

  .brand img {
    width: 184px;
    padding: 18px 22px;
  }
}