:root {
  --bg-page: #f5f5f5;
  --brand-primary: #111111;
  --brand-primary-soft: rgba(0, 0, 0, 0.08);
  --brand-hover: #000000;
  --text-high: #111111;
  --text-med: #444444;
  --text-low: #777777;
  --white: #ffffff;
  --error: #ba1a1a;
  --success: #8a6b3f;
  --radius-xl: 32px;
  --radius-md: 16px;
  --shadow-bevel: 0 20px 50px rgba(0, 0, 0, 0.06), inset 0 1px 0 rgba(255, 255, 255, 1);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: "Google Sans", sans-serif;
}
body {
  background: radial-gradient(circle at top right, #ffffff 0%, #f5f5f5 100%);
  color: var(--text-high);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
}
.auth-container {
  width: 100%;
  max-width: 460px;
}
.auth-card {
  background: var(--white);
  padding: 24px 50px 50px 50px;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-bevel);
  border: 1px solid rgba(0, 0, 0, 0.06);
  position: relative;
}
#message-box {
  margin-bottom: 20px;
  padding: 12px 16px;
  border-radius: 12px;
  font-size: 0.9rem;
  font-weight: 500;
  display: none;
  text-align: center;
  animation: fadeIn 0.3s ease;
}
#message-box.error {
  display: block;
  background: #ffdad6;
  color: var(--error);
  border: 1px solid rgba(186, 26, 26, 0.1);
}
#message-box.success {
  display: block;
  background: #f3eee6;
  color: var(--success);
  border: 1px solid rgba(183, 147, 83, 0.16);
}
.logo-mark {
  font-size: 2.2rem;
  font-weight: 500;
  letter-spacing: -1.5px;
  color: var(--brand-primary);
  margin-bottom: 4px;
  display: block;
}
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.internal-nav {
  margin-bottom: 24px;
}
.back-link {
  text-decoration: none;
  color: var(--text-med);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
  padding: 8px 12px;
  margin-left: -20px;
  border-radius: 12px;
}
.back-link:hover {
  color: var(--brand-primary);
  background: var(--brand-primary-soft);
}
header {
  text-align: center;
  margin-bottom: 36px;
}
h2 {
  font-size: 1.6rem;
  letter-spacing: -0.5px;
  font-weight: 700;
}
.google-signin-slot {
  min-height: 44px;
  margin-bottom: 16px;
  display: flex;
  justify-content: center;
}
.google-signin-slot > div {
  width: 100% !important;
}
.auth-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 4px 0 18px;
  color: var(--text-low);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.auth-divider::before,
.auth-divider::after {
  content: "";
  height: 1px;
  flex: 1;
  background: #e7e7e7;
}
.form-stack {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.form-group label {
  display: block;
  margin-bottom: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-med);
  padding-left: 4px;
}
.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}
.input-wrapper span {
  position: absolute;
  left: 20px;
  color: var(--text-low);
  font-size: 22px;
}
input {
  width: 100%;
  padding: 16px 20px 16px 56px;
  border: 1.5px solid #dddddd;
  border-radius: var(--radius-md);
  font-size: 1rem;
  background: #fafafa;
  transition: var(--transition);
}
input:focus {
  outline: none;
  border-color: var(--brand-primary);
  background: var(--white);
  box-shadow: 0 0 0 4px var(--brand-primary-soft);
}
.btn-submit {
  width: 100%;
  padding: 18px;
  background: var(--brand-primary);
  color: var(--white);
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 10px;
}
.btn-submit:hover {
  background: var(--brand-hover);
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.18);
}
.btn-submit:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none !important;
}
.footer-link {
  text-align: center;
  margin-top: 32px;
  color: var(--text-med);
  font-size: 0.95rem;
}
.footer-link a {
  color: var(--brand-primary);
  text-decoration: none;
  font-weight: 700;
}
@media (max-width: 500px) {
  .auth-card {
    padding: 24px 24px 40px 24px;
  }
  .back-link {
    margin-left: -8px;
  }
}