:root {
    --primary-color: #00873E;
    --primary-dark: #006b31;
    --secondary-color: #00a649;
    --background-color: #f8faf9;
    --text-color: #2c3e50;
    --border-radius: 12px;
    --box-shadow: 0 8px 30px rgba(0, 135, 62, 0.1);
    --input-height: 50px;
    --spacing-unit: 20px;
}

body {
    font-family: 'Poppins', 'Inter', sans-serif;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.8)), url('/static/assets/students.jpg');
    padding: 60px 20px;
    margin: 0;
    color: var(--text-color);
    line-height: 1.6;
    background-size: cover;
    background-position: center;
}

.container {
    max-width: 800px;
    margin: 40px auto;
    padding: 48px;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(0, 135, 62, 0.1);
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.container:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(0, 135, 62, 0.2);
}

form {
    display: grid;
    gap: calc(var(--spacing-unit) * 1.2);
}

.form-section {
    margin-bottom: calc(var(--spacing-unit) * 2);
    animation: fadeIn 0.4s ease-out;
}

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

h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
    margin-bottom: calc(var(--spacing-unit) * 2);
    text-align: center;
    font-weight: 800;
    letter-spacing: -0.5px;
    position: relative;
}

h1::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

input:not([type="checkbox"]),
select,
textarea {
    width: 100%;
    height: var(--input-height);
    padding: 0 20px;
    border: 2px solid rgba(0, 135, 62, 0.15);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: all 0.3s ease;
    background-color: #fff;
    box-sizing: border-box;
}

input:not([type="checkbox"]):hover,
select:hover,
textarea:hover {
    border-color: var(--secondary-color);
}

input:focus,
select:focus,
textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(0, 135, 62, 0.1);
    outline: none;
    transform: translateY(-2px);
}

.checkbox-container {
    display: flex;
    align-items: center;
    min-height: var(--input-height);
    padding: 0 20px;
    background-color: rgba(0, 135, 62, 0.05);
    border-radius: var(--border-radius);
    transition: background-color 0.2s ease;
}

.checkbox-container:hover {
    background-color: rgba(0, 135, 62, 0.08);
}

button {
    width: 100%;
    height: var(--input-height);
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 600;
    transition: all 0.3s ease;
    margin-top: calc(var(--spacing-unit) * 2);
    position: relative;
    overflow: hidden;
}

button::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, rgba(255,255,255,0.1), rgba(255,255,255,0));
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}

button:hover::before {
    transform: translateX(100%);
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 135, 62, 0.2);
}

.error-message {
    color: #ff4d6d;
    font-size: 0.9rem;
    margin-top: 8px;
    display: none;
    animation: slideIn 0.3s ease;
}

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

button.loading {
    opacity: 0.8;
    cursor: wait;
}

button.loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    border: 2px solid #ffffff;
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 0.8s linear infinite;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
}

@keyframes spin {
    to { transform: translateY(-50%) rotate(360deg); }
}

@media (max-width: 768px) {
    .container {
        margin: 20px;
        padding: 30px;
    }

    h1 {
        font-size: 2rem;
    }

    input:not([type="checkbox"]),
    select,
    textarea {
        font-size: 16px;
    }
}

/* Back Link Styling */
.back-link {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 500;
    margin-bottom: 30px;
    padding: 10px 20px;
    border-radius: 25px;
    background: rgba(0, 135, 62, 0.1);
    transition: all 0.3s ease;
}

.back-link:hover {
    background: rgba(0, 135, 62, 0.15);
    transform: translateX(-5px);
}

.back-link i {
    margin-right: 8px;
    font-size: 0.9em;
}

.container {
    position: relative;
    background: linear-gradient(to bottom right, #ffffff, #f8faf9);
    border: 1px solid rgba(0, 135, 62, 0.1);
}

h1 {
    position: relative;
    padding-bottom: 15px;
    margin-bottom: 40px;
}

h1::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

h2 {
    display: inline-block;
    padding: 8px 16px;
    background: rgba(0, 135, 62, 0.08);
    border-radius: var(--border-radius);
    margin-top: 40px;
}

.form-group {
    position: relative;
    margin-bottom: 25px;
}

label {
    display: inline-block;
    margin-bottom: 10px;
    font-weight: 500;
    position: relative;
    padding-left: 5px;
}

label::before {
    content: '';
    position: absolute;
    left: -5px;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 2px;
    opacity: 0.7;
}

input:not([type="checkbox"]),
select,
textarea {
    border: 2px solid rgba(0, 135, 62, 0.15);
    transition: all 0.3s ease;
}

input:not([type="checkbox"]):focus,
select:focus,
textarea:focus {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 135, 62, 0.1);
}

.checkbox-container {
    background: rgba(0, 135, 62, 0.05);
    border-radius: var(--border-radius);
    padding: 15px;
    margin-top: 10px;
}

button[type="submit"] {
    position: relative;
    overflow: hidden;
    z-index: 1;
}

button[type="submit"]::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, rgba(255,255,255,0.1), rgba(255,255,255,0));
    transform: translateX(-100%);
    transition: transform 0.6s ease;
    z-index: -1;
}

button[type="submit"]:hover::before {
    transform: translateX(100%);
}


/* nav */
/* Navigation */
nav {
    padding: 1.5rem;
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: var(--max-width);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    z-index: 999;
    border-radius: 0 0 30px 30px;
    transition: all 0.3s ease;
  }
  
  .nav__logo {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text-dark);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: all 0.3s ease;
  }
  
  .nav__logo:hover {
    transform: scale(1.05);
  }
  
  .nav__logo-icon {
    width: 45px;
    height: 45px;
    background: var(--primary-gradient);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--extra-light);
    font-size: 1.5rem;
    box-shadow: 
      0 8px 20px rgba(0, 135, 62, 0.2),
      0 0 0 2px rgba(0, 135, 62, 0.1);
    transition: all 0.3s ease;
  }
  
  .nav__logo:hover .nav__logo-icon {
    transform: rotate(-10deg);
    box-shadow: 
      0 12px 30px rgba(0, 135, 62, 0.3),
      0 0 0 4px rgba(0, 135, 62, 0.2);
  }
  
  .nav__logo span {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }
  
  .nav__logo small {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-light);
    opacity: 0.8;
  }
  
  .nav__wrapper {
    display: flex;
    align-items: center;
    gap: 2.5rem;
  }
  
  .nav__links {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 2.5rem;
  }