/* --- Universal Box Sizing --- */
*,
*::before,
*::after {
    box-sizing: border-box;
}

/* ============================================= */
/*      STYLING FOR MODERN REGISTRATION PAGE     */
/* ============================================= */

/* --- Section Wrapper --- */
#registration-form-section {
    background: rgba(255, 255, 255, 0.05);
    padding: 3rem 2rem;
    backdrop-filter: blur(10px);
    border-radius: 20px;
    margin: 2rem auto;
    max-width: 800px; 
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.18);
}

/* --- Form Card --- */
.modern-form {
    background: #ffffff;
    border-radius: 15px;
    padding: 2.5rem;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

/* --- Form Grid --- */
.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

/* --- Form Elements --- */
.form-group label, .fieldset-legend {
    display: block;
    margin-bottom: 0.75rem;
    font-weight: 600;
    color: #333;
    font-size: 0.95rem;
}

.form-group input[type="text"],
.form-group input[type="date"],
.form-group input[type="tel"],
.form-group input[type="number"] {
    width: 100%;
    padding: 14px 18px;
    border: 1px solid #ddd;
    border-radius: 10px;
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(163, 42, 42, 0.15);
}

/* --- Custom Radio Buttons --- */
.fieldset { border: none; padding: 0; margin: 0; }
.radio-group { display: flex; gap: 1rem; }
.radio-group label { flex: 1; padding: 14px; border: 1px solid #ddd; border-radius: 10px; cursor: pointer; text-align: center; transition: all 0.3s ease; }
.radio-group input[type="radio"] { display: none; }
.radio-group input[type="radio"]:checked + span { color: var(--primary-color); font-weight: 700; }
.radio-group label:has(input:checked) { border-color: var(--primary-color); background-color: rgba(163, 42, 42, 0.05); box-shadow: 0 2px 8px rgba(163, 42, 42, 0.1); }

/* --- Submit Button --- */
.submit-btn { width: 100%; padding: 16px; font-size: 1.2rem; font-weight: 700; background: linear-gradient(45deg, var(--primary-color), #c0392b); color: white; border: none; border-radius: 12px; cursor: pointer; transition: transform 0.2s, box-shadow 0.3s; }
.submit-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(192, 57, 43, 0.3); }
.submit-btn:disabled { background: #ccc; cursor: not-allowed; transform: none; box-shadow: none; }

/* --- Student Info Section (Hidden/Visible) --- */
#student-info { transition: opacity 0.4s ease, transform 0.4s ease; }
#student-info.hidden { opacity: 0; transform: scaleY(0.9); max-height: 0; overflow: hidden; margin: 0; padding: 0; gap: 0; transition: all 0.4s ease-out; }
.hidden { display: none !important; }

/* --- Form Status & List Styles --- */
.form-status-message { padding: 15px; margin-top: 1rem; margin-bottom: 1rem; border-radius: 10px; font-weight: 500; text-align: center; opacity: 0; height: 0; overflow: hidden; transition: all 0.4s ease; }
.form-status-message.visible { opacity: 1; height: auto; margin-bottom: 1rem; }
.form-status-message.success { background-color: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
.form-status-message.error { background-color: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }

#member-list-section { margin-top: 2rem; text-align: center; }
.list-toggle-btn { padding: 12px 30px; background: #333; color: #fff; border-radius: 50px; font-size: 1rem; cursor: pointer; transition: all 0.3s ease; }
.list-toggle-btn:hover { background: #555; }

#member-list-container { background: #ffffff; border-radius: 15px; box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1); margin-top: 1.5rem; overflow: hidden; transition: all 0.5s ease; }
#member-list-container.hidden { max-height: 0; opacity: 0; margin-top: 0; box-shadow: none; }

/* --- Table Wrapper for Scrolling --- */
.table-wrapper {
    overflow-x: auto; /* Enables horizontal scrolling on small screens */
}

/* --- Member Table Styling --- */
.member-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 600px; /* Ensures table has a minimum width, forcing scroll on small screens */
}
.member-table th, .member-table td {
    padding: 16px 22px;
    border-bottom: 1px solid #f0f0f0;
    text-align: center; 
}
.member-table th {
    background-color: #fcfcfc;
    font-weight: 600;
    color: #555;
}
.member-table tr:last-child td { border-bottom: none; }
.member-table tr:hover { background-color: #fafafa; }

.list-status-message { padding: 4rem; text-align: center; color: #888; }
.loading-spinner { border: 5px solid #f3f3f3; border-top: 5px solid #555; border-radius: 50%; width: 50px; height: 50px; animation: spin 1s linear infinite; margin: 4rem auto; }

@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

/* --- Responsive Adjustments --- */
@media (max-width: 768px) {
    .form-grid { grid-template-columns: 1fr; }
    #registration-form-section { padding: 2rem 1rem; }
    .modern-form { padding: 1.5rem; }
}