* {
    box-sizing: border-box;
}

:root {
    --bk-navy: #1a2b6d;
    --bk-navy-soft: #243b7a;
    --bk-red: #c8102e;
    --bk-bg: #f5f7fb;
    --bk-border: #d8dee9;
    --bk-text: #1f2937;
    --bk-muted: #5b6475;
    --bk-success-bg: #ecfdf3;
    --bk-success-border: #86efac;
    --bk-error: #b42318;
    --bk-error-bg: #fef3f2;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    background: var(--bk-bg);
    color: var(--bk-text);
    line-height: 1.5;
}

.site-header {
    display: flex;
    justify-content: center;
    background: #fff;
    border-bottom: 3px solid var(--bk-red);
    box-shadow: 0 1px 0 rgba(26, 43, 109, 0.06);
}

.header-inner {
    width: 100%;
    max-width: 720px;
    margin: 0 auto;
    padding: 0.75rem 1.25rem;
    display: flex;
    justify-content: center;
}

.header-brand {
    display: inline-flex;
    align-items: center;
    gap: 0.625rem;
    flex-wrap: nowrap;
    max-width: 100%;
}

.header-brand-mark {
    display: flex;
    align-items: center;
    flex: 0 0 auto;
    width: 48px;
    height: 38px;
    overflow: hidden;
}

.site-logo {
    display: block;
    width: auto;
    height: 38px;
    max-width: none;
    flex-shrink: 0;
    object-fit: contain;
    object-position: left center;
}

.header-brand-text {
    margin: 0;
    flex: 0 1 auto;
    font-family: "Source Serif 4", Georgia, "Times New Roman", serif;
    font-size: clamp(1rem, 2.5vw, 1.28rem);
    font-weight: 600;
    color: var(--bk-navy);
    letter-spacing: 0.01em;
    line-height: 1.1;
    white-space: nowrap;
}

.page-main {
    padding: 1.5rem 1rem 3rem;
    overflow: visible;
}

.form-shell {
    max-width: 720px;
    margin: 0 auto;
}

.form-card {
    background: #fff;
    border: 1px solid var(--bk-border);
    border-radius: 12px;
    padding: 1.5rem 1.25rem 1.75rem;
    box-shadow: 0 8px 24px rgba(26, 43, 109, 0.06);
    overflow: visible;
}

.student-form {
    min-width: 0;
}

.form-title {
    margin: 0 0 0.35rem;
    font-size: 1.45rem;
    color: var(--bk-navy);
}

.form-lead {
    margin: 0 0 1.5rem;
    color: var(--bk-muted);
    font-size: 0.95rem;
}

.form-section {
    margin: 0 0 1.75rem;
    padding: 0;
    border: 0;
    min-width: 0;
    overflow: visible;
}

fieldset.form-section {
    display: flow-root;
}

.form-section--locked {
    opacity: 0.55;
}

.form-section:not(.form-section--locked) {
    opacity: 1;
}

.section-title {
    margin: 0 0 0.75rem;
    font-size: 1.05rem;
    color: var(--bk-navy-soft);
    font-weight: 700;
}

fieldset.form-section > legend.section-title {
    display: block;
    width: 100%;
    padding: 0;
    float: left;
}

fieldset.form-section > .section-hint,
fieldset.form-section > .field,
fieldset.form-section > .class-row,
fieldset.form-section > .btn-link,
fieldset.form-section > .class-preview {
    clear: both;
}

.section-hint {
    margin: -0.35rem 0 0.75rem;
    font-size: 0.875rem;
    color: var(--bk-muted);
}

.field {
    margin-bottom: 1rem;
    min-width: 0;
    position: relative;
}

.field:last-child {
    margin-bottom: 0;
}

.field:has(.searchable-select.is-open) {
    z-index: 40;
}

label {
    display: block;
    margin-bottom: 0.35rem;
    font-weight: 600;
    font-size: 0.92rem;
}

.req {
    color: var(--bk-red);
}

input[type="text"],
select {
    width: 100%;
    padding: 0.6rem 0.7rem;
    border: 1px solid var(--bk-border);
    border-radius: 8px;
    font: inherit;
    background: #fff;
    color: var(--bk-text);
}

input[type="text"]:focus,
select:focus {
    outline: 2px solid rgba(26, 43, 109, 0.25);
    border-color: var(--bk-navy-soft);
}

.field .searchable-select {
    position: relative;
    display: block;
    width: 100%;
    max-width: 100%;
}

.searchable-select select.searchable-select-native {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
    opacity: 0 !important;
    pointer-events: none !important;
}

.searchable-select-control {
    display: flex;
    align-items: center;
    width: 100%;
    max-width: 100%;
    min-height: 44px;
    padding: 0.6rem 2rem 0.6rem 0.7rem;
    border: 1px solid var(--bk-border);
    border-radius: 8px;
    font: inherit;
    text-align: left;
    background: #fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%235b6475' d='M1 1l5 5 5-5'/%3E%3C/svg%3E") no-repeat right 0.75rem center;
    color: var(--bk-text);
    cursor: pointer;
    box-sizing: border-box;
}

.searchable-select-control.is-placeholder {
    color: var(--bk-muted);
}

.searchable-select-control:focus {
    outline: 2px solid rgba(26, 43, 109, 0.25);
    border-color: var(--bk-navy-soft);
}

.searchable-select.is-open .searchable-select-control {
    outline: 2px solid rgba(26, 43, 109, 0.25);
    border-color: var(--bk-navy-soft);
}

.searchable-select.is-invalid .searchable-select-control {
    border-color: #f04438;
}

.searchable-select.is-disabled .searchable-select-control {
    opacity: 0.65;
    background-color: #f8fafc;
    cursor: not-allowed;
}

.searchable-select-panel {
    display: none;
    position: absolute;
    z-index: 50;
    left: 0;
    right: 0;
    top: calc(100% + 4px);
    margin: 0;
    border: 1px solid var(--bk-border);
    border-radius: 8px;
    background: #fff;
    box-shadow: 0 12px 28px rgba(26, 43, 109, 0.16);
    overflow: hidden;
    box-sizing: border-box;
}

.searchable-select.is-open .searchable-select-panel {
    display: block;
}

.searchable-select.is-panel-fixed .searchable-select-panel {
    right: auto;
}

.searchable-select-search-wrap {
    padding: 0.5rem;
    border-bottom: 1px solid var(--bk-border);
    background: #fafbfc;
}

.searchable-select-search {
    display: block;
    width: 100%;
    margin: 0;
    padding: 0.5rem 0.6rem;
    border: 1px solid var(--bk-border);
    border-radius: 6px;
    font: inherit;
    box-sizing: border-box;
}

.searchable-select-search:focus {
    outline: 2px solid rgba(26, 43, 109, 0.2);
    border-color: var(--bk-navy-soft);
}

.searchable-select-list {
    max-height: 240px;
    overflow-y: auto;
    padding: 0 0 0.35rem;
}

.searchable-select-group {
    padding: 0.45rem 0.7rem 0.2rem;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--bk-navy-soft);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.searchable-select-option {
    display: block;
    width: 100%;
    padding: 0.5rem 0.7rem;
    border: 0;
    background: transparent;
    font: inherit;
    text-align: left;
    color: var(--bk-text);
    cursor: pointer;
}

.searchable-select-option:hover,
.searchable-select-option.is-selected {
    background: rgba(26, 43, 109, 0.08);
    color: var(--bk-navy);
}

.searchable-select-empty {
    padding: 0.65rem 0.7rem;
    color: var(--bk-muted);
    font-size: 0.9rem;
}

input[type="text"].is-invalid,
select.is-invalid {
    border-color: #f04438;
}

.email-input-row {
    display: flex;
    flex-wrap: wrap;
    align-items: stretch;
    gap: 0;
    border: 1px solid var(--bk-border);
    border-radius: 8px;
    overflow: hidden;
    background: #fff;
}

.email-input-row:focus-within {
    outline: 2px solid rgba(26, 43, 109, 0.25);
    border-color: var(--bk-navy-soft);
}

.email-input-row.is-invalid {
    border-color: #f04438;
}

.email-input-row input {
    flex: 1 1 140px;
    min-width: 0;
    border: 0;
    border-radius: 0;
}

.email-input-row input:focus {
    outline: none;
}

.email-domain {
    flex: 0 0 auto;
    padding: 0.6rem 0.75rem;
    background: #f8fafc;
    color: var(--bk-muted);
    font-size: 0.88rem;
    border-left: 1px solid var(--bk-border);
    white-space: nowrap;
}

.btn-link {
    display: inline-block;
    margin: -0.25rem 0 0.75rem;
    padding: 0;
    border: 0;
    background: none;
    color: var(--bk-navy-soft);
    font: inherit;
    font-weight: 600;
    cursor: pointer;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.btn-link:hover {
    color: var(--bk-red);
}

.class-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
    min-width: 0;
}

.class-row .field {
    margin-bottom: 0;
}

@media (min-width: 560px) {
    .class-row {
        grid-template-columns: 1fr 1fr;
    }
}

.class-preview {
    margin: 0.25rem 0 0;
    font-size: 0.9rem;
    color: var(--bk-navy);
    font-weight: 600;
    min-height: 1.25rem;
}

.field-error {
    margin: 0.35rem 0 0;
    font-size: 0.85rem;
    color: var(--bk-error);
}

.form-error-banner {
    margin: 0 0 0.75rem;
    padding: 0.75rem;
    border-radius: 8px;
    background: var(--bk-error-bg);
    border: 1px solid #fecdca;
    color: var(--bk-error);
    font-size: 0.9rem;
}

.form-actions {
    margin-top: 0.5rem;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.75rem 1rem;
    border: 0;
    border-radius: 8px;
    background: var(--bk-navy);
    color: #fff;
    font: inherit;
    font-weight: 600;
    cursor: pointer;
}

.btn-primary:hover:not(:disabled) {
    background: var(--bk-navy-soft);
}

.btn-primary:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.btn-primary.is-loading {
    pointer-events: none;
}

.btn-spinner {
    width: 1rem;
    height: 1rem;
    border: 2px solid rgba(255, 255, 255, 0.35);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.empty-state {
    margin: 0;
    padding: 0.85rem 1rem;
    border-radius: 8px;
    background: #fff8e6;
    border: 1px solid #f5d08a;
    color: #7a4d00;
}

.form-success {
    margin-bottom: 1.25rem;
    padding: 1rem 1.1rem;
    border-radius: 10px;
    background: var(--bk-success-bg);
    border: 1px solid var(--bk-success-border);
}

.success-title {
    margin: 0 0 0.25rem;
    font-weight: 700;
    color: #166534;
}

.success-text {
    margin: 0;
    color: #14532d;
}

.student-form.is-hidden {
    display: none;
}

.success-modal {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.success-modal[hidden] {
    display: none !important;
}

.success-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.45);
}

.success-modal-panel {
    position: relative;
    width: min(100%, 420px);
    background: #fff;
    border-radius: 12px;
    padding: 1.5rem 1.25rem 1.25rem;
    box-shadow: 0 18px 40px rgba(15, 23, 42, 0.18);
    border: 1px solid var(--bk-border, #d9e2ec);
    text-align: center;
}

.success-modal-text {
    margin: 0 0 1.25rem;
    font-size: 1.05rem;
    line-height: 1.5;
    color: #14532d;
    font-weight: 600;
}

body.form-modal-open {
    overflow: hidden;
}

.it-excel-launch {
    width: 100%;
    max-width: 720px;
    margin: 0 auto 0.75rem;
    padding: 0 1rem;
    display: flex;
    justify-content: flex-end;
}

.btn-it-excel {
    padding: 0.5rem 0.85rem;
    border-radius: 8px;
    border: 1px solid var(--bk-navy);
    background: #fff;
    color: var(--bk-navy);
    font: inherit;
    font-weight: 600;
    cursor: pointer;
}

.btn-it-excel:hover {
    background: #eef2ff;
}

.it-excel-modal {
    position: fixed;
    inset: 0;
    z-index: 2100;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.it-excel-modal[hidden] {
    display: none !important;
}

.it-excel-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.45);
}

.it-excel-modal-panel {
    position: relative;
    width: min(100%, 520px);
    max-height: min(90vh, 720px);
    overflow: auto;
    background: #fff;
    border-radius: 12px;
    padding: 1.25rem 1.25rem 1.5rem;
    box-shadow: 0 18px 40px rgba(15, 23, 42, 0.18);
    border: 1px solid var(--bk-border);
}

.it-excel-modal-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.it-excel-modal-title {
    margin: 0;
    font-size: 1.15rem;
    color: var(--bk-navy);
}

.it-excel-close-btn {
    border: 0;
    background: transparent;
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    color: var(--bk-muted);
    padding: 0.15rem 0.35rem;
}

.it-excel-lead {
    margin: 0 0 1rem;
    color: var(--bk-muted);
    font-size: 0.92rem;
}

.it-excel-error {
    margin: 0 0 0.75rem;
    padding: 0.65rem 0.75rem;
    border-radius: 8px;
    background: var(--bk-error-bg);
    border: 1px solid #fecdca;
    color: var(--bk-error);
    font-size: 0.88rem;
}

.it-excel-actions-row {
    margin-bottom: 0.75rem;
}

.it-excel-file-field .it-excel-file-label {
    display: block;
    margin-bottom: 0.35rem;
    font-weight: 600;
    font-size: 0.92rem;
}

.it-excel-file-picker {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.65rem;
}

.it-excel-file-native {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.it-excel-file-btn {
    padding: 0.5rem 0.85rem;
    border-radius: 8px;
    border: 1px solid var(--bk-navy);
    background: #fff;
    color: var(--bk-navy);
    font: inherit;
    font-weight: 600;
    cursor: pointer;
}

.it-excel-file-btn:hover:not(:disabled) {
    background: #eef2ff;
}

.it-excel-file-btn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.it-excel-file-name {
    flex: 1 1 140px;
    font-size: 0.9rem;
    color: var(--bk-muted);
    word-break: break-all;
}

.it-excel-campus-notice {
    margin: 0 0 1rem;
    padding: 0.65rem 0.75rem;
    border-radius: 8px;
    background: #fff8e6;
    border: 1px solid #f5d08a;
    color: #7a4d00;
    font-size: 0.88rem;
    line-height: 1.45;
}

.btn-secondary-link {
    display: inline-flex;
    align-items: center;
    padding: 0.45rem 0.75rem;
    border-radius: 8px;
    border: 1px solid var(--bk-border);
    background: #f8fafc;
    color: var(--bk-navy);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
}

.btn-secondary-link:hover {
    background: #eef2ff;
}

.it-excel-result {
    margin-top: 1rem;
}

.it-excel-result-card {
    padding: 0.85rem 0.9rem;
    border-radius: 10px;
    border: 1px solid var(--bk-border);
    background: #f8fafc;
}

.it-excel-result-card h3 {
    margin: 0 0 0.5rem;
    font-size: 1rem;
}

.it-excel-result-stats {
    margin: 0 0 0.75rem;
    padding-left: 1.1rem;
}

.it-excel-result-table-wrap {
    overflow: auto;
    max-height: 220px;
}

.it-excel-result-table-wrap table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.it-excel-result-table-wrap th,
.it-excel-result-table-wrap td {
    border: 1px solid var(--bk-border);
    padding: 0.35rem 0.45rem;
    text-align: left;
    vertical-align: top;
}

.it-excel-result-table-wrap th {
    background: #fff;
}

@media (min-width: 768px) {
    .form-card {
        padding: 2rem 2rem 2.25rem;
    }
}