/* ===== RESET ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Poppins', sans-serif;
  background: url('/asset/login1.webp') no-repeat center center fixed;
  background-size: cover;
  height: 100vh;
  overflow: hidden;
  position: relative;
}

/* ===== NỀN ĐỘNG TOÀN MÀN HÌNH ===== */
.background-animation::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.1), rgba(173,216,230,0.2));
  backdrop-filter: blur(1.5px);
  animation: moveGradient 18s ease-in-out infinite;
  z-index: 0;
}

@keyframes moveGradient {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(12px, -12px); }
}

/* ===== CONTAINER ===== */
.center-content {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  position: relative;
  z-index: 1;
}

/* ===== LOGIN BOX ===== */
.login-box {
  position: relative;
  background: rgba(255, 255, 255, 0.92);
  border-radius: 20px;
  padding: 40px 32px;
  width: 100%;
  max-width: 420px;
  text-align: center;
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.25);
  backdrop-filter: blur(5px);
  overflow: hidden;
  z-index: 1;
}

.login-box::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
      rgba(255, 255, 255, 0.03),
      rgba(0, 123, 255, 0.03)
    ),
    url('/asset/login5.jpg') center center / cover no-repeat;
  opacity: 0.38;
  filter: contrast(135%) brightness(1.2) saturate(1.1);
  animation: loginBgMove 20s ease-in-out infinite alternate;
  z-index: 0;
}

@keyframes loginBgMove {
  0% { transform: scale(1) translate(0, 0); }
  50% { transform: scale(1.05) translate(-5px, -5px); }
  100% { transform: scale(1) translate(0, 0); }
}

.login-box * {
  position: relative;
  z-index: 1;
}

.login-box h2 {
  font-size: 28px;
  font-weight: 700;
  color: #007bff;
  margin-bottom: 25px;
  text-shadow: 0 0 10px rgba(0, 123, 255, 0.4);
  position: relative;
}

.login-box h2::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 3px;
  background: linear-gradient(to right, #007bff, #00c6ff);
  border-radius: 2px;
}

/* ===== INPUT ===== */
.input-group {
  position: relative;
  margin-bottom: 20px;
}

.input-icon {
  position: absolute;
  left: 15px;
  top: 50%;
  transform: translateY(-50%);
  color: #007bff;
  z-index: 2;
  font-size: 16px;
}

.input-group input {
  padding-left: 45px;
  width: 100%;
  padding-right: 20px;
  padding-top: 14px;
  padding-bottom: 14px;
  border: 2px solid #ddd;
  border-radius: 30px;
  background: rgba(240, 248, 255, 0.9);
  font-size: 15px;
  transition: all 0.3s ease;
}

.input-group input:focus {
  border-color: #007bff;
  box-shadow: 0 0 12px rgba(0, 123, 255, 0.3);
  outline: none;
  background: rgba(255, 255, 255, 0.95);
}

/* ===== BUTTON: ĐĂNG NHẬP ===== */
.login-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: #007bff;
  color: white;
  padding: 12px 24px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 123, 255, 0.4);
  transition: all 0.3s ease;
}

.login-btn i {
  margin-right: 8px;
  font-size: 18px;
}

.login-btn:hover {
  background-color: #0056b3;
  box-shadow: 0 6px 18px rgba(0, 123, 255, 0.6);
  transform: translateY(-2px);
}

/* ===== BUTTON: ĐĂNG XUẤT ===== */
.logout-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: #dc3545;
  color: white;
  padding: 12px 24px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(220, 53, 69, 0.4);
  transition: all 0.3s ease;
}

.logout-btn i {
  margin-right: 8px;
  font-size: 18px;
}

.logout-btn:hover {
  background-color: #c82333;
  box-shadow: 0 6px 18px rgba(220, 53, 69, 0.6);
  transform: translateY(-2px);
}

/* ===== THÔNG BÁO ===== */
.error {
  color: #d63031;
  font-size: 14px;
  margin-top: 10px;
  background: rgba(255, 71, 87, 0.1);
  border: 1px solid #ff4757;
  padding: 10px;
  border-radius: 6px;
}

.success {
  color: #27ae60;
  font-size: 14px;
  margin-top: 10px;
  padding: 12px 15px;
  border-radius: 8px;
  font-weight: 500;
  text-align: center;
  background: rgba(40, 167, 69, 0.1);
  border: 1px solid #28a745;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== LIÊN KẾT ===== */
.register-links {
  margin-top: 24px;
  font-size: 14px;
  color: #444;
}

.register-links a {
  color: #007bff;
  text-decoration: none;
  font-weight: 600;
}

.register-links a:hover {
  text-decoration: underline;
}

.register-links i {
  margin-right: 5px;
}

.server-info {
  margin-top: 18px;
  font-size: 13px;
  font-style: italic;
  background: #f5f5f5;
  padding: 10px;
  border-radius: 12px;
  color: #666;
}
/* ===== BUTTON: ĐĂNG KÝ (Trang Đăng Ký) ===== */
.register-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: #007bff;
  color: white;
  padding: 12px 24px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 123, 255, 0.4);
  transition: all 0.3s ease;
  width: 100%;
  margin-top: 16px;
}

.register-btn i {
  margin-right: 8px;
  font-size: 18px;
}

.register-btn:hover {
  background-color: #0056b3;
  box-shadow: 0 6px 18px rgba(0, 123, 255, 0.6);
  transform: translateY(-2px);
}