:root {
    --toss-blue: #0064FF;
    --toss-light-gray: #f2f4f6;
    --toss-dark-gray: #333d4b;
    --toss-gray: #8b95a1;
    --toss-border-color: #e0e0e0; /* A slightly darker light gray for borders */
}

body {
    background-color: #f8f9fa; /* Slightly off-white background for overall page */
    color: var(--toss-dark-gray);
}

.container {
    max-width: 800px;
    padding-top: 2rem;
    padding-bottom: 2rem;
}

header {
    margin-bottom: 2rem;
}

.nav-pills .nav-link {
    color: var(--toss-gray);
    font-weight: 600;
    padding: 0.75rem 1.5rem; /* Increased padding */
    border-radius: 0.75rem; /* Slightly more rounded */
}

.nav-pills .nav-link.active {
    background-color: var(--toss-blue);
    color: #fff;
}

.form-control {
    border: 1px solid var(--toss-border-color);
    border-radius: 0.75rem;
    padding: 0.5rem 1rem;
    font-size: 1rem;
    transition: border-color .15s ease-in-out,box-shadow .15s ease-in-out;
}

.form-select {
    border: 1px solid var(--toss-border-color);
    border-radius: 0.75rem;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    transition: border-color .15s ease-in-out,box-shadow .15s ease-in-out;
    
    /* Fix for overlapping select arrow */
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23343a40' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M2 5l6 6 6-6'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 16px 12px;
    padding-right: 2.5rem; /* Ensure text doesn't overlap arrow */
}

.form-control:focus, .form-select:focus {
    border-color: var(--toss-blue);
    box-shadow: 0 0 0 0.25rem rgba(0, 100, 255, 0.25);
}

.btn-primary {
    background-color: var(--toss-blue);
    border-color: var(--toss-blue);
    border-radius: 0.75rem;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
}

.btn-search {
    padding: 0.5rem 1.5rem; /* Reduced vertical padding and adjusted horizontal padding for search button */
    white-space: nowrap; /* Prevent text from wrapping */
}

.btn-outline-primary {
    border-color: var(--toss-border-color);
    color: var(--toss-dark-gray);
    border-radius: 0.75rem;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
}

.btn-outline-primary.active, .btn-outline-primary:hover {
    background-color: var(--toss-blue);
    color: #fff;
    border-color: var(--toss-blue);
}

.card {
    border: none; /* Remove border */
    border-radius: 1rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05); /* Very light shadow for depth */
    background-color: #fff; /* Ensure card background is white */
    overflow: hidden; /* Ensures content respects border-radius */
}

.list-group-item {
    border-bottom: none; /* Remove bottom border */
    padding: 1rem 1.5rem;
    background-color: #fff; /* Ensure list item background is white */
}

.list-group-item.card {
    border-bottom: none; /* Remove bottom border when it's a card */
    border-radius: 1rem; /* Ensure border-radius is applied to all corners */
}

.list-group-item:last-child {
    border-bottom: none;
}

.list-group-item-action:hover {
    background-color: var(--toss-light-gray); /* Light hover effect */
}

.table {
    border-collapse: separate; /* Allows border-radius on table */
    border-spacing: 0;
    border: 1px solid var(--toss-border-color); /* Overall table border */
    border-radius: 1rem;
    overflow: hidden; /* Ensures rounded corners are visible */
    background-color: #fff;
}

.table th {
    font-weight: 600;
    color: var(--toss-dark-gray);
    background-color: var(--toss-light-gray); /* Light background for header */
    border-bottom: 1px solid var(--toss-border-color); /* Separator for header */
    padding: 1rem;
    text-align: center;
}

.table td {
    border-bottom: 1px solid var(--toss-border-color); /* Subtle row separator */
    padding: 1rem;
    vertical-align: middle;
    text-align: center;
}

.table tbody tr:last-child td {
    border-bottom: none;
}

.subject {
    font-weight: 600;
    color: var(--toss-dark-gray);
    white-space: nowrap; /* Prevent text from wrapping */
    overflow: hidden; /* Hide overflowing text */
    text-overflow: ellipsis; /* Show ellipsis for truncated text */
}

.teacher {
    color: var(--toss-gray);
    font-size: 0.9em;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    color: var(--toss-dark-gray);
}

.text-secondary {
    color: var(--toss-gray) !important;
}

.mb-4 {
    margin-bottom: 1.5rem !important; /* Adjust spacing */
}

.mt-4 {
    margin-top: 1.5rem !important; /* Adjust spacing */
}

.py-3 {
    padding-top: 1rem !important;
    padding-bottom: 1rem !important;
}

.g-3 {
    --bs-gutter-x: 1rem;
    --bs-gutter-y: 1rem;
}