:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --line: #e4e7ec;
    --muted: #667085;
    --success: #18794e;
    --warning: #b54708;
    --danger: #b42318;
    --shadow: 0 12px 32px rgba(16, 24, 40, .08);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif; color: #101828; background: #f7f9fc; }
body { margin: 0; min-height: 100vh; background: #f7f9fc; }
h1, h2, h3, p { margin-top: 0; }
a { color: inherit; text-decoration: none; }

.eyebrow { margin-bottom: 12px; color: var(--primary); font-size: 13px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.button { transition: background-color .15s ease, transform .15s ease; }
.button:hover { transform: translateY(-1px); }
.button.primary:hover { background: var(--primary-dark); }

.topbar { position: sticky; top: 0; z-index: 20; display: flex; justify-content: space-between; align-items: center; gap: 24px; padding: 14px max(20px, calc((100% - 1240px) / 2)); background: #fff; border-bottom: 1px solid var(--line); }
.topbar nav, .brand { display: flex; align-items: center; gap: 16px; }
.brand-mark { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 11px; color: #fff; background: var(--primary); font-weight: 800; }
.brand-logo { display: block; width: 32px; height: 32px; object-fit: contain; }
.brand small { display: block; color: var(--muted); }
.user-menu { position: relative; }
.user-menu summary { display: flex; align-items: center; gap: 8px; padding: 7px 9px; border-radius: 10px; cursor: pointer; list-style: none; font-weight: 700; }
.user-menu summary::-webkit-details-marker { display: none; }
.user-menu summary:hover, .user-menu[open] summary { background: #f0f4fa; }
.user-avatar { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 9px; color: #fff; background: #172b4d; font-size: 13px; font-weight: 900; }
.menu-chevron { color: var(--muted); font-size: 16px; }
.user-dropdown { position: absolute; top: calc(100% + 10px); right: 0; z-index: 50; display: grid; width: 230px; padding: 8px; border: 1px solid var(--line); border-radius: 14px; background: #fff; box-shadow: 0 18px 40px rgba(16,24,40,.16); }
.user-dropdown-head { display: grid; gap: 2px; padding: 10px 11px 12px; border-bottom: 1px solid var(--line); margin-bottom: 5px; }
.user-dropdown-head small { color: var(--muted); }
.user-dropdown > a { padding: 10px 11px; border-radius: 8px; }
.user-dropdown > a:hover { background: #f2f6fc; }
.dropdown-divider { height: 1px; margin: 5px 0; background: var(--line); }
.user-dropdown .dropdown-logout { color: var(--danger); font-weight: 800; }
.dropdown-logout-form { margin: 0; }
.user-dropdown button.dropdown-logout {
    width: 100%;
    border: 0;
    background: transparent;
    padding: 10px 12px;
    text-align: left;
    font: inherit;
    cursor: pointer;
}
.user-dropdown button.dropdown-logout:hover,
.user-dropdown button.dropdown-logout:focus-visible { background: #fff1f2; }
.profile-card { max-width: 720px; }
.user-active-check { display: flex; grid-template-columns: none; align-items: center; gap: 9px; }
.user-active-check input { width: 18px; height: 18px; }
.page-shell { width: min(100% - 40px, 1240px); margin: 28px auto; }
.footer { display: flex; flex-direction: column; justify-content: center; gap: 4px; width: min(100% - 40px, 1240px); margin: 30px auto; color: var(--muted); font-size: 12px; line-height: 1.4; text-align: center; }
.registration-card { max-width: 760px; margin: auto; }
.consent-row { display: flex; grid-template-columns: none; align-items: flex-start; gap: 10px; padding: 13px; border-radius: 10px; background: #f7f9fc; }
.consent-row input { flex: 0 0 auto; width: 18px; height: 18px; margin-top: 2px; }
.registration-requirements { margin: 18px 0; padding: 18px; border: 1px solid var(--line); border-radius: 12px; background: #fff; }
.registration-requirements ul { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 24px; margin: 12px 0 0; padding-left: 20px; }
@media (max-width: 600px) { .registration-requirements ul { grid-template-columns: 1fr; } }
.identity-confirmation { margin-top: 20px; padding: 22px; border: 1px solid #bfd3f2; border-radius: 16px; background: #f7faff; }
.identity-confirmation dl { display: grid; gap: 10px; margin: 18px 0; }
.identity-confirmation dl div { display: grid; grid-template-columns: 145px 1fr; gap: 12px; padding: 12px; border-radius: 10px; background: #fff; }
.identity-confirmation dt { color: var(--muted); }
.identity-confirmation dd { margin: 0; font-weight: 800; overflow-wrap: anywhere; }
.identity-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.identity-help { margin: 13px 0 0; font-size: 13px; }
.registration-back { margin-top: 16px; }
@media (max-width: 600px) {
    .identity-confirmation { padding: 16px; }
    .identity-confirmation dl div, .identity-actions { grid-template-columns: 1fr; }
}
.import-upload-card { max-width: 820px; margin: auto; }
.upload-form { display: grid; gap: 16px; margin-top: 22px; }
.file-drop { display: grid; place-items: center; min-height: 190px; padding: 24px; border: 2px dashed #a9bbd3; border-radius: 16px; text-align: center; background: #f8faff; cursor: pointer; }
.file-drop:hover { border-color: var(--primary); background: #f0f6ff; }
.file-drop-icon { display: grid; place-items: center; width: 48px; height: 48px; margin-bottom: 10px; border-radius: 14px; color: #fff; background: var(--primary); font-size: 26px; font-weight: 900; }
.file-drop span:not(.file-drop-icon) { margin-top: 6px; color: var(--muted); font-size: 13px; }
.file-drop input { max-width: 420px; margin-top: 18px; padding: 8px; background: #fff; }
.import-note { margin-top: 24px; padding: 18px; border-radius: 14px; background: #f7f9fc; }
.import-note pre { margin: 12px 0; padding: 14px; border-radius: 10px; overflow: auto; background: #172b4d; color: #fff; white-space: pre-wrap; }
.import-note p { margin-bottom: 0; color: var(--muted); }
.import-summary { position: sticky; top: 70px; z-index: 10; display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 18px; padding: 16px 20px; border: 1px solid var(--line); border-radius: 14px; background: rgba(255,255,255,.96); box-shadow: var(--shadow); }
.import-summary span { display: block; margin-top: 3px; color: var(--muted); font-size: 13px; }
.import-question { margin-bottom: 18px; }
.import-question-head { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 14px; }
.import-question-head h2 { margin: 0; font-size: 20px; }
.skip-question { display: flex; grid-template-columns: none; align-items: center; gap: 8px; font-size: 13px; }
.skip-question input { width: 17px; height: 17px; }
.import-meta, .import-options { margin-top: 16px; }
.import-actions { position: sticky; bottom: 12px; z-index: 10; display: flex; justify-content: flex-end; padding: 14px; border: 1px solid var(--line); border-radius: 14px; background: rgba(255,255,255,.96); box-shadow: var(--shadow); }
.import-cancel-form { margin-top: 12px; text-align: right; }
@media (max-width: 600px) {
    .import-summary, .import-question-head { align-items: flex-start; flex-direction: column; }
    .import-actions .button, .import-cancel-form .button { width: 100%; }
}
.answer-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-top: 16px; }
.answer-option { position: relative; display: grid; grid-template-columns: auto auto 1fr; align-items: center; gap: 12px; min-height: 76px; margin: 0; padding: 14px 16px; background: #fff; cursor: pointer; transition: border-color .15s ease, background-color .15s ease, box-shadow .15s ease; }
.answer-option:hover { border-color: #8bb4f8; background: #f7faff; }
.answer-option:has(input:checked) { border-color: var(--primary); background: #eef5ff; box-shadow: 0 0 0 2px rgba(37,99,235,.12); }
.answer-option input { width: 18px; height: 18px; margin: 0; accent-color: var(--primary); }
.answer-letter { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 9px; color: #173c6d; background: #dbeafe; font-weight: 900; }
.answer-option:has(input:checked) .answer-letter { color: #fff; background: var(--primary); }
.answer-text { min-width: 0; line-height: 1.45; overflow-wrap: anywhere; }
.submit-exam-button { min-height: 48px; margin-top: 18px; }
.question-pagination { display: grid; grid-template-columns: auto 1fr; align-items: end; gap: 14px 22px; margin-top: 20px; padding: 18px; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
.question-page-size { display: grid; gap: 7px; }
.question-page-size label { color: var(--muted); font-size: 13px; font-weight: 700; }
.question-page-size select { min-width: 150px; }
.question-page-status { align-self: center; color: var(--muted); font-size: 14px; text-align: right; }
.question-page-numbers { grid-column: 1 / -1; display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
.question-page-button { display: grid; place-items: center; min-width: 42px; height: 42px; padding: 0 12px; border: 1px solid #cfd8e6; border-radius: 10px; color: #173c6d; background: #fff; cursor: pointer; font: inherit; font-weight: 800; }
.question-page-button:hover { border-color: var(--primary); background: #eef5ff; }
.question-page-button.active { border-color: var(--primary); color: #fff; background: var(--primary); }
.question-page-button.answered { border-color: #2e8b57; box-shadow: inset 0 -4px #2e8b57; }
.question-page-button.incomplete { border-color: #d97706; box-shadow: inset 0 -4px #d97706; }
.question-page-button.active { box-shadow: none; }
.question-page-actions { grid-column: 1 / -1; display: flex; justify-content: space-between; gap: 12px; }
.question-page-actions .button { min-width: 130px; }
.exam-review-dialog { width: min(92vw, 680px); max-height: 86vh; padding: 24px; border: 0; border-radius: 18px; box-shadow: 0 24px 70px rgba(15, 23, 42, .28); }
.exam-review-dialog::backdrop { background: rgba(15, 23, 42, .62); }
.exam-review-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 18px; }
.exam-review-header h2 { margin: 0 0 5px; }
.dialog-close-button { border: 0; color: #475467; background: transparent; cursor: pointer; font-size: 30px; line-height: 1; }
.review-question-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(48px, 1fr)); gap: 9px; margin: 22px 0; }
.review-question-button { min-height: 46px; border: 2px solid #d97706; border-radius: 10px; color: #92400e; background: #fff7ed; cursor: pointer; font-weight: 800; }
.review-question-button.answered { border-color: #2e8b57; color: #166534; background: #ecfdf3; }
.exam-review-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 20px; }
.subjective-answer { margin-top: 16px; }
.subjective-answer textarea { min-height: 180px; line-height: 1.6; }
.paper-answer-note { margin-top: 16px; padding: 18px; border: 1px dashed #9db0c8; border-radius: 12px; color: #475467; background: #f8fafc; text-align: center; }
.access-code { padding: 5px 9px; border-radius: 7px; background: #eef4ff; font-family: ui-monospace, Consolas, monospace; letter-spacing: .1em; }
.invigilator-shell { width: min(760px, 100%); margin: auto; }
.invigilator-title { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 20px; }
.invigilator-title h1 { margin: 0; }
.invigilator-search { display: grid; grid-template-columns: 1fr 1.4fr auto; align-items: end; gap: 12px; margin-bottom: 18px; }
.invigilator-search .button { min-height: 42px; }
.emergency-candidate-card { margin-bottom: 18px; padding: 0; overflow: hidden; }
.emergency-candidate-card summary { display: grid; gap: 3px; padding: 16px 18px; color: #174ea6; background: #f7faff; font-weight: 800; cursor: pointer; list-style: none; }
.emergency-candidate-card summary::-webkit-details-marker { display: none; }
.emergency-candidate-card summary small { color: #718096; font-size: 12px; font-weight: 500; }
.emergency-candidate-card[open] summary { border-bottom: 1px solid var(--line); }
.emergency-candidate-form { display: grid; grid-template-columns: 1fr 1fr; gap: 13px; padding: 18px; }
.emergency-warning { display: grid; gap: 3px; padding: 12px 14px; border: 1px solid #f5d697; border-radius: 10px; color: #825500; background: #fff9e9; font-size: 12px; }
.invigilator-results { display: grid; gap: 16px; }
.candidate-fix-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 14px; margin-bottom: 18px; }
.candidate-fix-head h2 { margin-bottom: 5px; font-size: 20px; }
.candidate-fix-head span { color: var(--muted); font-size: 13px; overflow-wrap: anywhere; }
.candidate-fix-form { display: grid; grid-template-columns: 1fr 1fr; gap: 13px; }
.import-count-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 10px; margin-top: 16px; }
.import-count-grid span { padding: 14px; border-radius: 10px; background: #f5f7fa; text-align: center; }
.import-count-grid b { display: block; font-size: 24px; }
.candidate-review-list { display: grid; gap: 14px; }
.candidate-review-head { display: flex; justify-content: space-between; gap: 12px; }
.candidate-admin-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.candidate-admin-actions form { margin: 0; }
.inline-delete-form { display: inline-flex; margin: 0; }
.secure-settings { display: grid; gap: 14px; padding: 18px; border: 1px solid #b9cff3; border-radius: 14px; background: #f6f9ff; }
.secure-settings h3, .secure-settings p { margin-bottom: 4px; }
.secure-settings-options { display: grid; grid-template-columns: 1fr 1fr; gap: 13px 20px; padding-top: 14px; border-top: 1px solid #d7e2f4; }
.secure-option { display: flex; grid-template-columns: none; align-items: center; gap: 9px; }
.secure-option input { flex: 0 0 auto; width: 18px; height: 18px; }
.secure-start-gate { position: fixed; inset: 0; z-index: 1000; display: grid; place-items: center; padding: 20px; background: rgba(10,29,55,.92); }
.secure-start-card { width: min(440px, 100%); padding: 28px; border-radius: 20px; background: #fff; box-shadow: 0 24px 80px rgba(0,0,0,.3); text-align: center; }
.secure-shield { display: grid; place-items: center; width: 54px; height: 54px; margin: 0 auto 16px; border-radius: 16px; color: #fff; background: var(--primary); font-size: 26px; font-weight: 900; }
.secure-start-card p { color: var(--muted); line-height: 1.55; }
.candidate-watermark { position: fixed; z-index: 15; right: 18px; bottom: 18px; max-width: calc(100vw - 36px); padding: 7px 11px; border: 1px solid rgba(37,99,235,.2); border-radius: 8px; color: rgba(23,60,109,.48); background: rgba(255,255,255,.62); font-size: 11px; font-weight: 800; pointer-events: none; user-select: none; }
.security-warning { position: fixed; z-index: 900; top: 82px; left: 50%; width: min(560px, calc(100vw - 24px)); padding: 14px 18px; border: 1px solid #f0b8b3; border-radius: 12px; color: var(--danger); background: #fff0ef; box-shadow: var(--shadow); transform: translateX(-50%); }
.security-warning strong, .security-warning span { display: block; }
.security-warning span { margin-top: 3px; font-size: 13px; }
.secure-block-copy .exam-question, .secure-block-copy .exam-heading { -webkit-user-select: none; user-select: none; }
.conflict-compare { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 14px 0; }
.conflict-compare div { padding: 14px; border-radius: 10px; background: #f7f9fc; }
.conflict-compare p { margin: 8px 0 0; line-height: 1.5; }
.manual-conflict-fields { margin-top: 12px; }
@media (max-width: 700px) {
    .invigilator-page .topbar { position: sticky; align-items: center; padding: 10px 14px; }
    .invigilator-page .brand small { display: none; }
    .invigilator-page .staff-nav { display: flex; }
    .invigilator-page .staff-nav a:not(.invigilator-nav):not(.nav-user) { display: none; }
    .invigilator-page .nav-user { max-width: 95px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
    .invigilator-page .page-shell { width: min(100% - 20px, 760px); margin-top: 16px; }
    .invigilator-search, .candidate-fix-form, .emergency-candidate-form { grid-template-columns: 1fr; }
    .candidate-fix-form .span-2 { grid-column: auto; }
    .candidate-fix-head { align-items: flex-start; flex-direction: column; }
    .candidate-fix-form .button { min-height: 48px; }
    .import-count-grid, .conflict-compare { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 850px) {
    .topbar .staff-nav { display: flex; }
    .staff-nav > a { display: none; }
    .staff-nav .user-menu { display: block; }
    .user-menu summary > span:nth-child(2) { display: none; }
    .user-dropdown { position: fixed; top: 66px; right: 10px; width: min(300px, calc(100vw - 20px)); }
}
@media (max-width: 480px) { .import-count-grid, .conflict-compare { grid-template-columns: 1fr; } }
@media (max-width: 700px) {
    .answer-grid { grid-template-columns: 1fr; }
    .answer-option { min-height: 64px; }
    .exam-heading { align-items: stretch; }
    .exam-heading .timer { position: static; }
    .question-pagination { grid-template-columns: 1fr; align-items: stretch; padding: 14px; }
    .question-page-status { text-align: left; }
    .question-page-size select { width: 100%; }
    .question-page-actions .button { min-width: 0; flex: 1; }
    .exam-review-dialog { padding: 18px; }
    .exam-review-actions { flex-direction: column-reverse; }
    .exam-review-actions .button { width: 100%; }
    .secure-settings-options { grid-template-columns: 1fr; }
    .candidate-watermark { right: 10px; bottom: 10px; }
}