:root {
  --primary: #2c5aa0;
  --secondary: #4a7bc8;
  --accent: #ff6b6b;
  --light: #f8f9fa;
  --dark: #343a40;
  --gray: #6c757d;
  --border-radius: 12px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

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

body {
  font-family: 'Times New Roman', serif;
  background-color: #f0f2f5;
  color: var(--dark);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow-x: hidden;
}
.container {
  display: flex;
  flex-wrap: nowrap;
  width: 90%;
  max-width: 1200px;
  min-height: 650px;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  background: white;
  padding: 0;
}

/* Left Panel */
.left-panel {
  flex: 1.2;
  background: linear-gradient(rgba(44, 90, 160, 0.85), rgba(44, 90, 160, 0.9)), 
              url('https://images.unsplash.com/photo-1589998059171-988d887df646?ixlib=rb-4.0.3&auto=format&fit=crop&w=1000&q=80');
  background-size: cover;
  background-position: center;
  color: white;
  padding: 40px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
}

/* Left Panel Sttech */
.left-panel-sttech {
    flex: 1.2;
    background: linear-gradient(rgba(72, 178, 109, 0.85), rgba(9, 90, 32, 0.9)), url('https://images.unsplash.com/photo-1589998059171-988d887df646?ixlib=rb-4.0.3&auto=format&fit=crop&w=1000&q=80');
    background-size: cover;
    background-position: center;
    color: white;
    padding: 40px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
}

.logo-left img {height: 50px; filter: brightness(0) invert(1);}
.content-left {max-width: 90%;}
.content-left h1 {font-size: 2.2rem; margin-bottom: 30px; font-weight: 700;}

.features {list-style: none; margin-bottom: 30px;}
.features li {
  display: flex;
  align-items: flex-start;
  margin-bottom: 25px;
  padding: 15px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  backdrop-filter: blur(5px);
  transition: var(--transition);
}
.features li:nth-child(1) i { color: #007bff; } /* Quản lý Thư viện */
.features li:nth-child(2) i { color: #28a745; } /* Thư viện số */
.features li:nth-child(3) i { color: #ff9800; } /* Đánh giá đạt chuẩn */

.features li:hover {background: rgba(255, 255, 255, 0.15); transform: translateX(5px);}
.features i {font-size: 1.5rem; margin-right: 15px; margin-top: 5px; color: var(--accent);}

/* Right Panel */
.right-panel {
  flex: 1;
  padding: 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: white;
}

.login-card {
  max-width: 400px;
  margin: 0 auto;
  width: 100%;
}

.logo-right {text-align: center; margin-bottom: 20px;}
.logo-img {max-width: 150px; height: auto;}

.login-card h2 {
  text-align: center;
  margin-bottom: 30px;
  color: var(--dark);
  font-weight: 600;
  font-size: 1.5rem;
}

.form-group {margin-bottom: 20px; position: relative;}
.form-group i {
  position: absolute; left: 15px; top: 50%;
  transform: translateY(-50%); color: var(--gray); z-index: 2;
}

.form-control, .form-select {
  width: 100%; padding: 14px 15px 14px 45px;
  border: 1px solid #e1e5eb; border-radius: 8px;
  font-size: 1rem; background-color: #f8f9fa;
  transition: var(--transition);
}
.form-control:focus, .form-select:focus {
  outline: none; border-color: var(--secondary);
  box-shadow: 0 0 0 3px rgba(74, 123, 200, 0.2);
  background-color: white;
}

.options {
  display: flex; justify-content: space-between;
  align-items: center; margin-bottom: 25px; font-size: 0.9rem;
}

.btn-login {
  width: 100%; padding: 14px;
  background: var(--primary); color: white;
  border: none; border-radius: 8px;
  font-size: 1rem; font-weight: 600;
  cursor: pointer; transition: var(--transition);
}
.btn-login:hover {background: var(--secondary);}
.qr-section {
  display: flex;
  justify-content: center; /* Căn giữa cả khối QR */
  margin-top: 25px;
  gap: 1px; /* khoảng cách giữa 2 QR, tùy chỉnh 30–50px tùy ý */
}


.qr-item {
  text-align: center;
  flex: 1;
}

.qr-item img {
  width: 120px;
  height: 120px;
  border-radius: 8px;
  border: 1px solid #e1e5eb;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease;
}

.qr-item img:hover {
  transform: scale(1.05);
}

.qr-item p {
  margin-top: 8px;
  font-size: 0.9rem;
  color: var(--gray);
}
.select2-container--default .select2-selection--single .select2-selection__rendered {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: justify;
    -ms-flex-pack: justify;
    justify-content: space-between;
    width: 100%;
    color: #3F4254;
    position: relative;
    padding: 0.65rem 3rem 0.65rem 1rem;
    line-height: 1.5;
}
.select2-container--default .select2-selection--single,
.select2-container--default .select2-selection--multiple {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: justify;
    -ms-flex-pack: justify;
    justify-content: space-between;
    border: 1px solid #E4E6EF;
    outline: none !important;
    border-radius: 0.42rem;
    height: auto;
    line-height: 0;
}
.ml-auto,
.mx-auto {
    margin-left: auto !important;
}
.mr-auto,
.mx-auto {
    margin-right: auto !important;
}

.left-text{
    text-align: left !important;
}

.slogan {
    text-align: center;
    color: #fff;
    font-style: italic;
    margin-top: 20px;
    font-size: 20px;
    font-weight: 500;
}
.btn-green{
    background: #1aa438;
}

@media (max-width: 576px) {
    .left-panel-sttech{
        display: none;
    }
    .left-panel {
        display: none;
    }
    .padding-login {
        padding-right: 50px;
    }
}