* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #090d16 0%, #111827 50%, #0f172a 100%);
  color: #f8fafc;
  padding: 20px;
  position: relative;
  overflow: hidden;
}

/* Hiệu ứng ánh sáng nền */
.glow-circle-1 {
  position: absolute;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, rgba(0, 0, 0, 0) 70%);
  top: -100px;
  left: -100px;
  pointer-events: none;
}

.glow-circle-2 {
  position: absolute;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.12) 0%, rgba(0, 0, 0, 0) 70%);
  bottom: -150px;
  right: -150px;
  pointer-events: none;
}

.auth-card {
  width: 100%;
  max-width: 440px;
  background: rgba(30, 41, 59, 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 24px;
  padding: 40px 32px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.05);
  text-align: center;
  position: relative;
  z-index: 10;
  animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.brand-logo {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  border-radius: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  box-shadow: 0 10px 20px -5px rgba(59, 130, 246, 0.4);
}

.brand-logo svg {
  width: 28px;
  height: 28px;
  fill: white;
}

h1 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
  color: #ffffff;
}

p.subtitle {
  font-size: 14px;
  color: #94a3b8;
  line-height: 1.5;
  margin-bottom: 32px;
}

/* Thông báo lỗi / thành công */
.alert {
  padding: 12px 16px;
  border-radius: 12px;
  font-size: 13px;
  margin-bottom: 24px;
  text-align: left;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  line-height: 1.4;
}

.alert-error {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #fca5a5;
}

.alert-success {
  background: rgba(34, 197, 94, 0.15);
  border: 1px solid rgba(34, 197, 94, 0.3);
  color: #86efac;
}

/* Nút đăng nhập Google */
.btn-google {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
  padding: 14px 20px;
  background-color: #ffffff;
  color: #1f2937;
  border: 1px solid #e5e7eb;
  border-radius: 14px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

.btn-google:hover {
  background-color: #f8fafc;
  transform: translateY(-2px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.2), 0 4px 6px -2px rgba(0, 0, 0, 0.1);
}

.btn-google:active {
  transform: translateY(0);
}

.btn-google svg {
  width: 20px;
  height: 20px;
}

.policy-box {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 12px;
  color: #64748b;
  line-height: 1.6;
}

.policy-box strong {
  color: #cbd5e1;
}

.badge-secure {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: #38bdf8;
  background: rgba(56, 189, 248, 0.1);
  padding: 4px 10px;
  border-radius: 9999px;
  margin-bottom: 24px;
  border: 1px solid rgba(56, 189, 248, 0.2);
}

/* Container cho nút Google One Tap */
#g_id_onload {
  display: flex;
  justify-content: center;
  margin-top: 14px;
}