* {
    box-sizing: border-box;
}


/* Main heading */
h1 {
    margin: 8px 0 24px;
    text-align: center;
    font-size: 30px;
    font-weight: 700;
}

/* App tabs */
.section-tabs {
    display: flex;
    justify-content: center;
    gap: 14px;
    margin-bottom: 20px;
}

.tab-button {
    flex: 1;
    max-width: 220px;
    padding: 13px 16px;
    border: none;
    border-radius: 12px;
    background: #ddcbed;
    color: #222;
    font: inherit;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
}

.tab-button.active {
    background: #b9d9ff;
    box-shadow: inset 0 -3px 0 #527ebc;
}

.tab-button:hover {
    filter: brightness(0.97);
}

/* Import button */
.primary-button {
    padding: 14px 24px;
    border: none;
    border-radius: 12px;
    background: #377bb8;
    color: white;
    font: inherit;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
}

.primary-button:hover {
    background: #2e679c;
}

/* Keep the action centred */
.actions {
    display: flex;
    justify-content: center;
    margin-top: 30px;
}

/* Section headings */
h2 {
    margin: 28px 0 16px;
    text-align: center;
    font-size: 24px;
}

.demo-note,
.sheet-help {
    text-align: center;
    color: #454d5c;
    font-size: 14px;
    line-height: 1.6;
}

/* Hide inactive views and popup */
.hidden {
    display: none !important;
}

/* Footer */
.footer-note {
    margin-top: 24px;
    text-align: center;
    color: #596579;
    font-size: 12px;
}

button,
input,
textarea,
select,
table {
    font-family: inherit;
}
  
html {
    min-height: 100%;
    background: #123568;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: "Roboto", sans-serif;
    color: #111;
    background: transparent;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;

    background:
        radial-gradient(
            circle at 31% 24%,
            rgba(104, 181, 255, 0.96) 0 27%,
            transparent 27.2%
        ),
        radial-gradient(
            circle at 68% 73%,
            rgba(230, 244, 255, 0.88) 0 24%,
            transparent 24.2%
        ),
        linear-gradient(
            to bottom,
            #087db7 0%,
            #087db7 42%,
            #07518b 42%,
            #07518b 56%,
            #123568 56%,
            #123568 100%
        );
}

.app-container {
    width: 100%;
    padding: 20px 16px;
}

.grades-panel {
    width: 100%;
    max-width: 730px;
    min-height: 587px;
    margin: 0 auto;
    padding: 22px 30px 32px;

    border-radius: 20px;
    background: rgba(238, 251, 255, 0.86);
    border: 1px solid rgba(255, 255, 255, 0.85);
    box-shadow: 0 8px 24px rgba(14, 36, 78, 0.12);
}


/* Restore the centered Students table */
#students-sheet {
    width: 100%;
    margin: 0 auto;
}

#students-sheet table {
    width: 460px;
    max-width: 100%;
    margin: 0 auto;
    table-layout: fixed;
    border-collapse: collapse;
}

#students-sheet th:first-child,
#students-sheet td:first-child {
    width: 130px;
    text-align: left;
}

#students-sheet th:nth-child(2),
#students-sheet td:nth-child(2) {
    width: 330px;
    text-align: left;
}

#students-sheet th,
#students-sheet td {
    padding: 10px;
}

#students-sheet thead {
    border-bottom: 2px solid rgba(60, 75, 100, 0.2);
}

#students-sheet td {
    color: #3f4651;
    font-weight: 600;
}

#students-sheet tbody tr:hover {
    background: rgba(255, 255, 255, 0.35);
}


.add-subject-action {
    display: flex;
    justify-content: center;
    margin-top: 16px;
}

#add-subject-button {
    flex: initial;
    max-width: none;
    padding: 10px 18px;
}


/* Compact Excel table columns */
#excel-sheet table {
    width: max-content;
    max-width: 100%;
    margin: 0 auto;
    table-layout: auto;
}

/* Roll No column */
#excel-sheet th:first-child,
#excel-sheet td:first-child {
    width: 105px;
    min-width: 105px;
    white-space: nowrap;
    padding-right: 6px;
}

/* Name column */
#excel-sheet th:nth-child(2),
#excel-sheet td:nth-child(2) {
    width: 105px;
    min-width: 105px;
    white-space: nowrap;
    padding-left: 6px;
    padding-right: 6px;
}

/* Subject and marks columns */
#excel-sheet th:nth-child(n+3),
#excel-sheet td:nth-child(n+3) {
    width: 105px;
    min-width: 105px;
    padding: 5px;
}

/* Keep inputs compact */
#excel-sheet th input,
#excel-sheet td input {
    width: 100%;
    min-width: 0;
    box-sizing: border-box;
    padding: 7px 5px;
}


#excel-sheet th {
    text-align: left;
    vertical-align: middle;
}

#excel-sheet th input {
    text-align: left;
}


/* Import review modal */
.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px;
    background: rgba(10, 25, 48, 0.48);
}

.modal.hidden {
    display: none !important;
}

.modal-content {
    width: 100%;
    max-width: 785px;
    max-height: 94vh;
    overflow-y: auto;
    padding: 16px 18px;
    border: 1px solid #d6d6d6;
    border-radius: 22px;
    background: #fafafa;
    box-shadow: 0 8px 28px rgba(0, 0, 0, 0.18);
}

.modal-content > h2 {
    margin: 0;
    text-align: center;
    font-size: 23px;
    font-weight: 700;
}

.modal-subtitle {
    margin: 7px 0 22px;
    text-align: center;
    color: #666;
    font-size: 13px;
    font-weight: 600;
}

.summary-heading,
.details-heading {
    margin: 12px 0 5px;
    text-align: center;
    font-size: 16px;
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 8px;
}

.summary-tile {
    min-height: 49px;
    padding: 8px 5px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    border-radius: 10px;
    text-align: center;
    font-size: 12px;
    font-weight: 700;
}

.summary-tile strong {
    font-size: 13px;
}

.summary-tile.total {
    background: #efefef;
    color: #555;
}

.summary-tile.valid {
    background: #e1efff;
    color: #2870ce;
}

.summary-tile.invalid {
    background: #ffe7e7;
    color: #cf3939;
}

.summary-tile.missing,
.summary-tile.mismatch {
    background: #fff3dc;
    color: #bf7b16;
}

.summary-tile.format,
.summary-tile.subjects-not-found {
    background: #f3e9ff;
    color: #8251b9;
}

.summary-tile.not-found {
    background: #ffe7e7;
    color: #cf3939;
}

.details-heading {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid #ddd;
}

.details-table-wrapper {
    width: 100%;
    overflow-x: auto;
    margin-top: 10px;
}

.details-table {
    width: 100%;
    min-width: 580px;
    border-collapse: collapse;
    font-size: 12px;
}

.details-table th {
    padding: 9px 6px;
    background: #f0f3f7;
    text-align: center;
}

.details-table th:first-child {
    border-radius: 8px 0 0 8px;
}

.details-table th:last-child {
    border-radius: 0 8px 8px 0;
}

.details-table td {
    padding: 8px 6px;
    text-align: center;
    font-weight: 600;
}

.details-table .status-valid {
    color: #bf7b16;
}

.details-table .status-issue {
    color: #777;
}

.details-table .expand-button {
    border: none;
    background: transparent;
    color: #444;
    padding: 3px;
    cursor: pointer;
}

.details-table .issue-details td {
    text-align: left;
    white-space: normal;
    background: #f3f5f8;
    color: #555;
    font-weight: 400;
}

.modal-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 28px;
}

.confirm-button,
.cancel-button {
    width: 170px;
    min-height: 44px;
    padding: 10px 14px;
    border: none;
    border-radius: 14px;
    font-family: inherit;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
}

.confirm-button {
    background: #43a05b;
    color: white;
}

.confirm-button:hover {
    background: #37864b;
}

.cancel-button {
    background: #eaeaea;
    color: #111;
}

.cancel-button:hover {
    background: #ddd;
}


/* Keep the Marks table centered and readable */
#marks-sheet {
    width: 100%;
    overflow-x: auto;
}

#marks-sheet table {
    width: 100%;
    max-width: 650px;
    margin: 0 auto;
    border-collapse: collapse;
    table-layout: fixed;
}

#marks-sheet th,
#marks-sheet td {
    padding: 9px 10px;
    text-align: left;
    overflow-wrap: anywhere;
}

#marks-sheet th:first-child,
#marks-sheet td:first-child {
    width: 110px;
}

#marks-sheet th:nth-child(2),
#marks-sheet td:nth-child(2) {
    width: 150px;
}

#marks-sheet th:nth-child(n+3),
#marks-sheet td:nth-child(n+3) {
    width: 110px;
}

#marks-sheet thead {
    border-bottom: 2px solid rgba(60, 75, 100, 0.2);
}


/* More compact import summary popup */
.modal-content {
    max-width: 785px;
    max-height: 94vh;
    padding: 12px 16px;
}

.modal-content > h2 {
    font-size: 22px;
}

.modal-subtitle {
    margin-bottom: 14px;
}

.summary-heading,
.details-heading {
    margin-top: 8px;
    margin-bottom: 5px;
}

.summary-tile {
    min-height: 45px;
    padding: 6px 4px;
}

.details-table {
    font-size: 12px;
}

.details-table th,
.details-table td {
    padding: 6px 5px;
}

.modal-actions {
    margin-top: 18px;
}

.excel-import-section.hidden {
    display: none !important;
}

.status-message {
    min-height: 20px;
    margin: 12px 0;
    text-align: center;
    color: #287a42;
    font-size: 14px;
    font-weight: 600;
}

@media (max-width: 560px) {
    .modal-content {
        padding: 14px 10px;
        border-radius: 16px;
    }

    .summary-grid {
        gap: 5px;
    }

    .summary-tile {
        font-size: 10px;
        overflow-wrap: anywhere;
    }

    .modal-actions {
        gap: 8px;
    }

    .confirm-button,
    .cancel-button {
        width: auto;
        flex: 1;
    }
}