.sqab-lock {
    overflow: hidden !important;
}

.sqab-overlay {
    position: fixed;
    z-index: 2147483000;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px;
    overflow: hidden;
    background: rgba(17, 24, 39, 0.72);
    -webkit-overflow-scrolling: touch;
}

.sqab-modal,
.sqab-modal * {
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}

.sqab-modal {
    width: min(620px, calc(100vw - 24px));
    max-height: calc(100vh - 24px);
    max-height: calc(100dvh - 24px);
    margin: 0;
    overflow-x: hidden;
    overflow-y: auto;
    border: 1px solid #d9dee7;
    border-radius: 8px;
    background: #fff;
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.36);
    color: #141b2a;
    font-size: 14px;
    font-weight: 400 !important;
    line-height: 1.5;
    overscroll-behavior: contain;
    scrollbar-width: thin;
}

.sqab-modal * {
    font-weight: 400 !important;
}

.sqab-modal h1,
.sqab-modal h2,
.sqab-modal h3,
.sqab-modal h4,
.sqab-modal h5,
.sqab-modal h6,
.sqab-modal strong,
.sqab-modal b,
.sqab-note,
.sqab-status,
.sqab-keyword,
.sqab-google,
.sqab-step-number,
.sqab-confirm {
    font-weight: 600 !important;
}

.sqab-header {
    position: relative;
    padding: 20px 54px 10px;
    text-align: center;
}

.sqab-header h2 {
    margin: 0;
    color: #d20b00;
    font-size: 17px;
    line-height: 1.42;
}

.sqab-close {
    position: absolute;
    z-index: 2;
    top: 8px;
    right: 12px;
    width: 36px;
    height: 36px;
    padding: 0;
    border: 0;
    border-radius: 50%;
    background: transparent;
    color: #9aa3af;
    font-size: 30px;
    line-height: 34px;
    text-align: center;
    cursor: pointer;
    appearance: none;
}

.sqab-close:hover,
.sqab-close:focus-visible {
    background: #f3f4f6;
    color: #374151;
    outline: none;
}

.sqab-body {
    padding: 4px 20px 22px;
}

.sqab-note {
    margin: 0 0 12px;
    padding: 10px 12px;
    border: 1px dashed #e7591b;
    border-radius: 8px;
    background: #fffdf9;
    color: #d43c11;
    text-align: center;
    font-size: 14px;
}

.sqab-verify-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 8px;
    align-items: stretch;
}

.sqab-code {
    display: block;
    width: 100%;
    min-width: 0;
    height: 40px;
    margin: 0;
    padding: 0 14px;
    border: 1px solid #e1e5eb;
    border-radius: 2px;
    background: #f5f7fa;
    color: #182230;
    box-shadow: none;
    font-size: 14px;
    line-height: 40px;
    outline: none;
    appearance: none;
}

.sqab-code:focus {
    border-color: #168bc2;
    background: #fff;
    box-shadow: 0 0 0 3px rgba(8, 126, 184, 0.12);
}

.sqab-code::placeholder {
    color: #8c95a3;
    opacity: 1;
}

.sqab-confirm {
    min-width: 153px;
    height: 40px;
    margin: 0;
    padding: 0 16px;
    border: 0;
    border-radius: 4px;
    background: #087fb8;
    color: #fff;
    box-shadow: none;
    font-size: 14px;
    line-height: 40px;
    white-space: nowrap;
    cursor: pointer;
    appearance: none;
}

.sqab-confirm:hover,
.sqab-confirm:focus-visible {
    background: #066c9e;
    outline: none;
}

.sqab-confirm:disabled {
    opacity: 0.65;
    cursor: wait;
}

.sqab-status {
    min-height: 20px;
    margin: 6px 0 0;
    font-size: 13px;
}

.sqab-status:empty {
    min-height: 4px;
    margin: 0;
}

.sqab-status.error {
    color: #dc2626;
}

.sqab-status.ok {
    color: #15803d;
}

.sqab-task {
    color: #111827;
}

.sqab-loading,
.sqab-step {
    margin: 16px 0;
    padding: 12px;
    border: 1px solid #e5e7eb;
    border-radius: 6px;
    background: #f8fafc;
    color: #5b6472;
    text-align: center;
    font-size: 14px;
}

.sqab-step-card {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 4px;
    margin: 13px 0 0;
    padding: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
}

.sqab-step-number {
    display: inline;
    width: auto;
    height: auto;
    margin: 0;
    padding: 0;
    border-radius: 0;
    background: transparent;
    color: #111827;
    font-size: 14px;
    line-height: 1.55;
    white-space: nowrap;
}

.sqab-step-number::before {
    content: "Bước ";
}

.sqab-step-number::after {
    content: ":";
}

.sqab-step-content {
    min-width: 0;
}

.sqab-step-content > p {
    margin: 0 0 8px;
    color: #111827;
    font-size: 14px;
    line-height: 1.55;
}

.sqab-step-content > p:first-child {
    margin-top: 0;
}

.sqab-keyword-box {
    display: inline;
}

.sqab-keyword {
    color: #d20b00;
}

.sqab-copy,
.sqab-reload {
    margin: 0;
    border: 1px solid #8c98a7;
    background: #fff;
    color: #263242;
    cursor: pointer;
    appearance: none;
}

.sqab-copy {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 42px;
    height: 27px;
    margin-left: 5px;
    padding: 0 10px;
    border-radius: 999px;
    font-size: 12px;
    line-height: 25px;
    vertical-align: middle;
}

.sqab-copy:hover,
.sqab-copy:focus-visible,
.sqab-reload:hover,
.sqab-reload:focus-visible {
    border-color: #087fb8;
    color: #087fb8;
    outline: none;
}

.sqab-google {
    display: inline;
    margin: 0;
    color: #066fd1;
    text-decoration: none;
}

.sqab-google:hover,
.sqab-google:focus-visible {
    text-decoration: underline;
    outline: none;
}

.sqab-google-mock {
    position: relative;
    width: 100%;
    height: 184px;
    margin: 8px 0 0;
    padding: 36px 46px 24px;
    overflow: hidden;
    border: 1px solid #d7dbe1;
    background: #fff;
    text-align: center;
}

.sqab-google-mock::before {
    content: "";
    position: absolute;
    left: 42px;
    right: 42px;
    top: 9px;
    bottom: -75px;
    border: 6px solid #121212;
    border-radius: 76px 76px 24px 24px;
    pointer-events: none;
}

.sqab-phone-top {
    position: absolute;
    z-index: 1;
    top: 17px;
    left: 50%;
    width: 126px;
    height: 27px;
    transform: translateX(-50%);
    border-radius: 18px;
    background: #050505;
}

.sqab-google-brand {
    position: relative;
    z-index: 2;
    display: flex;
    justify-content: center;
    align-items: baseline;
    margin: 15px auto 12px;
    letter-spacing: -4px;
    font-size: 43px;
    line-height: 1;
    font-weight: 500 !important;
}

.sqab-google-brand span {
    font-weight: 500 !important;
}

.sqab-google-brand span:nth-child(1),
.sqab-google-brand span:nth-child(4) {
    color: #4285f4;
}

.sqab-google-brand span:nth-child(2),
.sqab-google-brand span:nth-child(6) {
    color: #ea4335;
}

.sqab-google-brand span:nth-child(3) {
    color: #fbbc05;
}

.sqab-google-brand span:nth-child(5) {
    color: #34a853;
}

.sqab-google-searchbar {
    display: flex;
    align-items: center;
    min-width: 0;
    border: 1px solid #e1e5ea;
    background: #fff;
    color: #202124;
    box-shadow: 0 2px 7px rgba(60, 64, 67, 0.16);
}

.sqab-google-searchbar {
    position: relative;
    z-index: 2;
    width: min(330px, 82%);
    height: 34px;
    margin: 0 auto;
    padding: 0 11px;
    border-radius: 18px;
    font-size: 13px;
    text-align: left;
}

.sqab-search-icon {
    position: relative;
    flex: 0 0 13px;
    width: 13px;
    height: 13px;
    margin-right: 9px;
    border: 2px solid #9aa0a6;
    border-radius: 50%;
}

.sqab-search-icon::after {
    content: "";
    position: absolute;
    right: -5px;
    bottom: -3px;
    width: 6px;
    height: 2px;
    transform: rotate(45deg);
    border-radius: 1px;
    background: #9aa0a6;
}

.sqab-search-tools {
    margin-left: auto;
    color: #6b7280;
    font-size: 12px;
    white-space: nowrap;
}


.sqab-guide-image {
    display: block;
    width: 100%;
    max-width: 100%;
    height: auto;
    margin: 8px 0 0;
    border: 1px solid #d9dee5;
    border-radius: 0;
    background: #fff;
    object-fit: contain;
}

.sqab-search-image {
    border-color: #ef4444;
}


/* v1.5.3: giữ nguyên kích thước ảnh cũ, thêm nút phóng to + trình xem kéo tự do */
.sqab-image-wrap {
    position: relative;
    margin: 8px 0 0;
}

.sqab-image-wrap .sqab-guide-image {
    margin-top: 0;
}

.sqab-image-zoom-btn {
    position: absolute;
    z-index: 3;
    top: 8px;
    right: 8px;
    width: 40px;
    height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    border: 1px solid rgba(15, 23, 42, .18);
    border-radius: 999px;
    background: rgba(255, 255, 255, .94);
    color: #111827;
    box-shadow: 0 5px 18px rgba(15, 23, 42, .18);
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.sqab-image-zoom-btn:hover,
.sqab-image-zoom-btn:focus-visible {
    background: #fff;
    color: #dc2626;
    outline: none;
    box-shadow: 0 0 0 3px rgba(220, 38, 38, .14), 0 5px 18px rgba(15, 23, 42, .18);
}

.sqab-image-zoom-btn svg {
    width: 21px;
    height: 21px;
    pointer-events: none;
}

.sqab-image-viewer {
    position: fixed;
    inset: 0;
    z-index: 2147483647;
    display: flex;
    flex-direction: column;
    background: rgba(3, 7, 18, .96);
    color: #fff;
}

.sqab-image-viewer[hidden] {
    display: none !important;
}

.sqab-image-viewer-toolbar {
    position: relative;
    z-index: 2;
    flex: 0 0 auto;
    min-height: 58px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 8px 10px 8px 14px;
    background: rgba(3, 7, 18, .96);
    border-bottom: 1px solid rgba(255, 255, 255, .14);
}

.sqab-image-viewer-title {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 14px;
    font-weight: 600;
}

.sqab-image-viewer-controls {
    display: flex;
    align-items: center;
    gap: 7px;
    flex: 0 0 auto;
}

.sqab-image-viewer-btn {
    min-width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 10px;
    border: 1px solid rgba(255, 255, 255, .2);
    border-radius: 9px;
    background: rgba(255, 255, 255, .1);
    color: #fff;
    font: inherit;
    font-size: 20px;
    line-height: 1;
    cursor: pointer;
    touch-action: manipulation;
}

.sqab-image-viewer-btn:hover,
.sqab-image-viewer-btn:focus-visible {
    background: rgba(255, 255, 255, .2);
    outline: none;
}

.sqab-image-viewer-stage {
    position: relative;
    flex: 1 1 auto;
    min-height: 0;
    overflow: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    touch-action: pan-x pan-y pinch-zoom;
    cursor: grab;
}

.sqab-image-viewer-stage.is-dragging {
    cursor: grabbing;
    user-select: none;
}

.sqab-image-viewer-image {
    display: block;
    max-width: none !important;
    height: auto !important;
    margin: 0;
    padding: 0;
    border: 0;
    background: #fff;
    transform: none !important;
    transform-origin: top left;
    user-select: none;
    -webkit-user-drag: none;
}

.sqab-image-viewer-hint {
    position: fixed;
    z-index: 2147483647;
    left: 50%;
    bottom: 14px;
    transform: translateX(-50%);
    max-width: calc(100vw - 28px);
    padding: 7px 11px;
    border-radius: 999px;
    background: rgba(15, 23, 42, .82);
    color: rgba(255, 255, 255, .9);
    font-size: 12px;
    line-height: 1.35;
    text-align: center;
    pointer-events: none;
}

.sqab-serp {
    margin: 8px 0 0;
    padding: 13px;
    border: 1px solid #ef4444;
    background: #fff;
}

.sqab-serp-url {
    color: #4b5563;
    font-size: 12px;
}

.sqab-serp-title {
    margin: 4px 0;
    color: #4f20bd;
    font-size: 17px;
    line-height: 1.35;
}

.sqab-serp-description {
    color: #4b5563;
    font-size: 12px;
    line-height: 1.45;
}

.sqab-help {
    margin: 12px 0 0;
    color: #087eb8;
    text-align: center;
    font-size: 12px;
    line-height: 1.45;
}

.sqab-pass-step {
    border-color: transparent;
    background: transparent;
}

.sqab-pass-step .sqab-step-number {
    background: transparent;
}

.sqab-final-note {
    margin-top: 8px !important;
    color: #111827 !important;
}

.sqab-final-note b {
    color: #d20b00;
}

.sqab-result-missing {
    margin: 8px 0 0;
    padding: 12px;
    border: 1px dashed #f59e0b;
    border-radius: 6px;
    background: #fffbeb;
    color: #92400e;
    font-size: 13px;
    line-height: 1.5;
}

.sqab-actions {
    display: flex;
    justify-content: flex-end;
    margin-top: 14px;
}

.sqab-reload {
    min-height: 34px;
    padding: 6px 12px;
    border-radius: 5px;
    background: #f8fafc;
    font-size: 12px;
}

@media (max-width: 700px) {
    /*
     * v1.6.4 - Mobile browser chrome fix
     *
     * Không khóa root-scroll trên điện thoại. Khi html bị overflow:hidden và
     * popup tự scroll, Chrome/Safari coi đây là một vùng cuộn độc lập nên thanh
     * địa chỉ/tab/navigation ở dưới rất dễ bị thu gọn và không thể gọi lại bằng
     * thao tác cuộn. Dùng small viewport (svh) + cho phép overscroll tự nhiên để
     * thanh công cụ trình duyệt vẫn có không gian xuất hiện.
     */
    html.sqab-lock {
        overflow: auto !important;
        overscroll-behavior: auto !important;
    }

    .sqab-overlay {
        align-items: flex-end;
        padding: 0;
        overflow-x: hidden;
        overflow-y: auto;
        overscroll-behavior-y: auto;
        -webkit-overflow-scrolling: touch;
        background: rgba(16, 24, 32, 0.56);
    }

    .sqab-modal {
        width: 100%;
        max-width: none;
        max-height: calc(100vh - 16px);
        max-height: calc(100svh - 16px);
        margin: 16px 0 0;
        padding-bottom: env(safe-area-inset-bottom, 0px);
        border: 0;
        border-radius: 34px 34px 0 0;
        box-shadow: 0 -8px 36px rgba(0, 0, 0, 0.24);
        font-size: 17px;
        overscroll-behavior-y: auto;
        touch-action: pan-y;
    }

    .sqab-header {
        padding: 44px 24px 22px;
    }

    .sqab-header h2 {
        max-width: 690px;
        margin: 0 auto;
        color: #c42f31;
        font-size: clamp(25px, 6.2vw, 34px);
        line-height: 1.26;
        letter-spacing: -0.02em;
    }

    .sqab-close {
        top: 14px;
        right: 18px;
        width: 44px;
        height: 44px;
        color: #030303;
        font-size: 46px;
        line-height: 40px;
    }

    .sqab-close:hover,
    .sqab-close:focus-visible {
        background: transparent;
        color: #030303;
    }

    .sqab-body {
        padding: 0 22px 34px;
    }

    .sqab-note {
        margin: 0 auto 24px;
        padding: 0 6px;
        border: 0;
        border-radius: 0;
        background: transparent;
        color: #092a7b;
        font-size: clamp(20px, 5vw, 28px);
        line-height: 1.3;
    }

    .sqab-verify-row {
        display: flex;
        gap: 5px;
        align-items: center;
        width: 100%;
        min-height: 70px;
        padding: 6px;
        border: 1px solid #e6e9ee;
        border-radius: 999px;
        background: #fff;
        box-shadow: 0 7px 20px rgba(31, 41, 55, 0.17);
    }

    .sqab-code {
        flex: 1 1 auto;
        width: 1%;
        min-width: 0;
        height: 56px;
        padding: 0 14px 0 18px;
        border: 0;
        border-radius: 999px;
        background: transparent;
        box-shadow: none;
        font-size: clamp(17px, 4.7vw, 23px);
        line-height: 56px;
    }

    .sqab-code:focus {
        border: 0;
        background: transparent;
        box-shadow: none;
    }

    .sqab-confirm {
        flex: 0 0 auto;
        min-width: 148px;
        height: 56px;
        padding: 0 18px;
        border-radius: 999px;
        background: #4f93f4;
        font-size: clamp(17px, 4.5vw, 22px);
        line-height: 56px;
    }

    .sqab-confirm:hover,
    .sqab-confirm:focus-visible {
        background: #3e83e7;
    }

    .sqab-status {
        min-height: 26px;
        margin: 8px 4px 0;
        text-align: center;
        font-size: 15px;
    }

    .sqab-status:empty {
        min-height: 8px;
    }

    .sqab-loading,
    .sqab-step {
        margin: 18px 0;
        font-size: 16px;
    }

    .sqab-step-card {
        display: block;
        margin: 24px 0 0;
        font-size: 19px;
        line-height: 1.45;
    }

    .sqab-step-number,
    .sqab-step-content > p:first-child {
        display: inline;
    }

    .sqab-step-content {
        display: contents;
    }

    .sqab-step-number {
        color: #c42f31;
        font-size: clamp(20px, 5vw, 27px);
        line-height: 1.35;
    }

    .sqab-step-content > p {
        margin: 0;
        color: #101010;
        font-size: clamp(19px, 4.9vw, 26px);
        line-height: 1.45;
    }

    .sqab-step-content > p:not(:first-child) {
        display: block;
        margin-top: 12px;
    }

    .sqab-keyword {
        color: #ef1d19;
        font-size: clamp(26px, 7.4vw, 39px);
        line-height: 1.15;
    }

    .sqab-keyword-box {
        display: inline-flex;
        flex-wrap: wrap;
        align-items: center;
        gap: 7px;
        vertical-align: middle;
    }

    .sqab-copy {
        width: auto;
        min-width: 78px;
        height: 34px;
        margin: 0;
        padding: 0 11px;
        overflow: visible;
        border: 1px solid #20242a;
        border-radius: 999px;
        background: #fff;
        color: #111;
        font-size: 14px;
        line-height: 32px;
        white-space: nowrap;
        vertical-align: middle;
    }

    .sqab-copy:hover,
    .sqab-copy:focus-visible {
        border-color: #087fb8;
        color: #087fb8;
    }

    .sqab-google {
        color: #096dcc;
        text-decoration: underline;
    }

    .sqab-google-mock {
        display: none;
    }

    .sqab-google-brand {
        justify-content: flex-start;
        width: max-content;
        margin: 12px 0 0 62px;
        letter-spacing: -5px;
        font-size: clamp(50px, 13vw, 72px);
    }

    /* Trên mobile vẫn dùng đúng class .sqab-google-searchbar của PC. */
    .sqab-step-content > .sqab-google-searchbar {
        display: flex;
        width: 100%;
        min-height: 58px;
        height: auto;
        margin: 20px 0 0;
        padding: 0 16px;
        border-radius: 999px;
        font-size: 16px;
    }

    .sqab-step-content > .sqab-google-searchbar > span:nth-child(2) {
        flex: 1 1 auto;
        min-width: 0;
        color: #ed3f3f;
        text-align: center;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .sqab-step-content > .sqab-google-searchbar .sqab-search-tools {
        font-size: 14px;
    }

    .sqab-image-wrap,
    .sqab-guide-image,
    .sqab-serp,
    .sqab-result-missing {
        margin-top: 20px;
    }

    .sqab-image-wrap .sqab-guide-image {
        margin-top: 0;
    }

    .sqab-guide-image {
        border-width: 1px;
    }

    .sqab-image-zoom-btn {
        top: 7px;
        right: 7px;
        width: 42px;
        height: 42px;
    }

    .sqab-image-viewer-toolbar {
        min-height: 56px;
        padding: 7px 8px 7px 12px;
    }

    .sqab-image-viewer-title {
        font-size: 13px;
    }

    .sqab-serp {
        padding: 13px;
    }

    .sqab-serp-url,
    .sqab-serp-description {
        font-size: 14px;
    }

    .sqab-serp-title {
        font-size: 19px;
    }

    .sqab-help {
        margin: 14px 0 0;
        font-size: 15px;
    }

    .sqab-final-note {
        display: block !important;
        margin-top: 14px !important;
        font-size: 17px !important;
    }

    .sqab-actions {
        justify-content: center;
        margin-top: 24px;
    }

    .sqab-reload {
        min-height: 40px;
        padding: 8px 15px;
        border-radius: 999px;
        font-size: 14px;
    }
}

@media (max-width: 390px) {
    .sqab-header {
        padding-right: 19px;
        padding-left: 19px;
    }

    .sqab-body {
        padding-right: 14px;
        padding-left: 14px;
    }

    .sqab-verify-row {
        min-height: 62px;
    }

    .sqab-code,
    .sqab-confirm {
        height: 50px;
        line-height: 50px;
    }

    .sqab-confirm {
        min-width: 126px;
        padding: 0 13px;
    }

    .sqab-google-brand {
        margin-left: 40px;
    }
}

/* Giữ nút Nộp bài hiển thị nhưng khóa thao tác cho đến khi hoàn thành toàn bộ đề. */
.sqab-submit-gated,
[data-sqab-submit-gated="1"] {
    opacity: 0.62 !important;
    cursor: not-allowed !important;
    filter: grayscale(0.15);
}

.sqab-submit-progress-notice {
    position: fixed;
    left: 50%;
    bottom: 24px;
    z-index: 2147483647;
    width: min(92vw, 560px);
    padding: 14px 18px;
    border-radius: 10px;
    background: #fff7e6;
    border: 1px solid #f0b429;
    color: #6b4300;
    font-size: 15px;
    font-weight: 600;
    line-height: 1.45;
    text-align: center;
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.18);
    transform: translate(-50%, 20px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity .2s ease, transform .2s ease, visibility .2s ease;
}

.sqab-submit-progress-notice.is-visible {
    transform: translate(-50%, 0);
    opacity: 1;
    visibility: visible;
}

@media (max-width: 700px) {
    .sqab-submit-progress-notice {
        bottom: 16px;
        padding: 12px 14px;
        font-size: 14px;
    }
}


/* Gợi ý và điều hướng câu hỏi bằng bàn phím trên máy tính. */
.sqab-keyboard-navigation-note {
    display: flex;
    align-items: center;
    gap: 9px;
    margin: 0 0 16px;
    padding: 10px 14px;
    border: 1px solid #bfdbfe;
    border-radius: 9px;
    background: #eff6ff;
    color: #1e3a5f;
    font-size: 14px;
    font-weight: 600;
    line-height: 1.45;
}

.sqab-keyboard-note-icon {
    flex: 0 0 auto;
    font-size: 18px;
    line-height: 1;
}

.sqab-keyboard-keys {
    display: inline-flex;
    gap: 5px;
    margin-left: auto;
}

.sqab-keyboard-keys kbd {
    min-width: 29px;
    padding: 2px 7px;
    border: 1px solid #93a4b8;
    border-bottom-width: 2px;
    border-radius: 5px;
    background: #ffffff;
    color: #172033;
    font: 700 14px/1.35 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    text-align: center;
    box-shadow: 0 1px 1px rgba(15, 23, 42, 0.08);
}

@media (max-width: 700px), (hover: none), (pointer: coarse) {
    .sqab-keyboard-navigation-note {
        display: none !important;
    }
}

/* v1.5.1: nhấn mạnh câu chưa làm đầu tiên khi người dùng cố nộp sớm. */
.sqab-unanswered-focus {
    outline: 3px solid #f59e0b !important;
    outline-offset: 4px !important;
    border-radius: 10px;
    animation: sqab-unanswered-pulse .85s ease-in-out 2;
}

@keyframes sqab-unanswered-pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(245, 158, 11, 0); }
    50% { box-shadow: 0 0 0 7px rgba(245, 158, 11, .18); }
}


/* v1.5.6 - giữ ô nhập mã phía trên và thêm ô nhập mã ở bước cuối. */
.sqab-master-verify {
    position: static !important;
    width: auto !important;
    height: auto !important;
    overflow: visible !important;
    opacity: 1 !important;
    pointer-events: auto !important;
    margin-bottom: 8px;
}

.sqab-final-verify {
    margin-top: 12px;
}

.sqab-code-inline {
    display: block;
    width: 100%;
    min-width: 0;
    height: 46px;
    margin: 0;
    padding: 0 14px;
    border: 2px solid #168bc2;
    border-radius: 6px;
    background: #fff;
    color: #182230;
    font-size: 17px;
    line-height: 46px;
    outline: none;
    box-sizing: border-box;
}

.sqab-code-inline:focus {
    border-color: #087fb8;
    box-shadow: 0 0 0 4px rgba(8, 126, 184, 0.13);
}

.sqab-confirm-inline {
    min-width: 170px;
    height: 46px;
    margin: 0;
    padding: 0 18px;
    border: 0;
    border-radius: 6px;
    background: #087fb8;
    color: #fff;
    font-size: 15px;
    font-weight: 700;
    line-height: 46px;
    white-space: nowrap;
    cursor: pointer;
}

.sqab-confirm-inline:hover,
.sqab-confirm-inline:focus-visible {
    background: #066c9e;
    outline: none;
}

.sqab-confirm-inline:disabled {
    opacity: .65;
    cursor: wait;
}

@media (max-width: 700px) {
    .sqab-final-verify {
        display: grid !important;
        grid-template-columns: 1fr !important;
        gap: 10px !important;
        min-height: 0 !important;
        padding: 0 !important;
        border: 0 !important;
        border-radius: 0 !important;
        background: transparent !important;
        box-shadow: none !important;
    }

    .sqab-code-inline {
        width: 100% !important;
        height: 56px !important;
        padding: 0 16px !important;
        border: 2px solid #4f93f4 !important;
        border-radius: 10px !important;
        background: #fff !important;
        font-size: 20px !important;
        line-height: 56px !important;
        text-align: center;
        letter-spacing: 2px;
    }

    .sqab-confirm-inline {
        width: 100% !important;
        min-width: 0 !important;
        height: 54px !important;
        border-radius: 10px !important;
        font-size: 19px !important;
        line-height: 54px !important;
    }
}


/* v1.5.7 - retry gọn khi kết nối TrafficTD bị reset TLS/cURL 35 */
.sqab-task-error{text-align:center}
.sqab-task-retry{margin-top:12px;min-height:42px;padding:9px 18px;border:0;border-radius:10px;background:#2563eb;color:#fff;font:inherit;font-weight:700;cursor:pointer;box-shadow:0 8px 20px rgba(37,99,235,.18)}
.sqab-task-retry:hover,.sqab-task-retry:focus-visible{background:#1d4ed8;outline:none}


/* v1.5.8 - thanh tiến độ + Nộp bài cố định ở đáy màn hình cho gd_document và tdi_exam. */
.sqab-mobile-submit-bar {
    display: none;
}

@media (max-width: 700px) {
    html.sqab-mobile-submit-enabled body {
        padding-bottom: calc(92px + env(safe-area-inset-bottom, 0px)) !important;
    }

    .sqab-mobile-submit-bar {
        position: fixed;
        z-index: 2147482000;
        right: 8px;
        bottom: calc(8px + env(safe-area-inset-bottom, 0px));
        left: 8px;
        display: grid;
        grid-template-columns: minmax(0, 1fr) minmax(138px, 44%);
        align-items: center;
        gap: 10px;
        min-height: 72px;
        padding: 9px 10px 9px 16px;
        border: 1px solid rgba(15, 23, 42, .10);
        border-radius: 18px;
        background: rgba(255, 255, 255, .97);
        box-shadow: 0 10px 34px rgba(15, 23, 42, .20);
        -webkit-backdrop-filter: blur(14px);
        backdrop-filter: blur(14px);
        box-sizing: border-box;
    }

    html.sqab-lock .sqab-mobile-submit-bar {
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transform: translateY(14px);
    }

    .sqab-mobile-progress {
        min-width: 0;
        display: flex;
        flex-direction: column;
        justify-content: center;
        gap: 1px;
        color: #0f172a;
        line-height: 1.15;
    }

    .sqab-mobile-progress-label {
        display: block;
        overflow: hidden;
        color: #475569;
        font-size: 13px;
        font-weight: 600;
        white-space: nowrap;
        text-overflow: ellipsis;
    }

    .sqab-mobile-progress-count {
        display: block;
        margin-top: 3px;
        color: #111827;
        font-size: 24px;
        font-weight: 800;
        letter-spacing: -.5px;
    }

    .sqab-mobile-submit-button {
        width: 100%;
        min-width: 0;
        min-height: 54px;
        margin: 0;
        padding: 0 16px;
        border: 0;
        border-radius: 999px;
        background: #f59e0b;
        color: #fff;
        box-shadow: 0 6px 16px rgba(245, 158, 11, .22);
        font-size: 17px;
        font-weight: 800;
        line-height: 1;
        text-align: center;
        white-space: nowrap;
        cursor: pointer;
        appearance: none;
        -webkit-tap-highlight-color: transparent;
        touch-action: manipulation;
    }

    .sqab-mobile-submit-button.is-incomplete {
        background: #f59e0b;
    }

    .sqab-mobile-submit-button.is-complete {
        background: #16a34a;
        box-shadow: 0 6px 16px rgba(22, 163, 74, .22);
    }

    .sqab-submit-progress-notice {
        bottom: calc(94px + env(safe-area-inset-bottom, 0px));
    }
}

@media (max-width: 380px) {
    .sqab-mobile-submit-bar {
        grid-template-columns: minmax(0, 1fr) minmax(124px, 43%);
        gap: 8px;
        min-height: 68px;
        padding-left: 13px;
    }
    .sqab-mobile-progress-label { font-size: 12px; }
    .sqab-mobile-progress-count { font-size: 22px; }
    .sqab-mobile-submit-button { min-height: 50px; padding: 0 12px; font-size: 16px; }
}


/* v1.5.9 - PC: thu gọn thanh tiến độ vào góc phải dưới. Mobile vẫn full-width như v1.5.8. */
@media (min-width: 701px) {
    .sqab-mobile-submit-bar {
        position: fixed;
        z-index: 2147482000;
        right: 18px;
        bottom: 18px;
        left: auto;
        display: grid;
        grid-template-columns: 92px 172px;
        align-items: center;
        gap: 10px;
        width: auto;
        min-width: 0;
        min-height: 62px;
        padding: 8px 9px 8px 13px;
        border: 1px solid rgba(15, 23, 42, .10);
        border-radius: 16px;
        background: rgba(255, 255, 255, .97);
        box-shadow: 0 10px 30px rgba(15, 23, 42, .18);
        -webkit-backdrop-filter: blur(12px);
        backdrop-filter: blur(12px);
        box-sizing: border-box;
    }

    html.sqab-lock .sqab-mobile-submit-bar {
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transform: translateY(12px);
    }

    .sqab-mobile-progress {
        min-width: 0;
        display: flex;
        flex-direction: column;
        justify-content: center;
        gap: 1px;
        line-height: 1.05;
    }

    .sqab-mobile-progress-label {
        display: block;
        overflow: hidden;
        color: #64748b;
        font-size: 10px;
        font-weight: 700;
        white-space: nowrap;
        text-overflow: ellipsis;
    }

    .sqab-mobile-progress-count {
        display: block;
        margin-top: 3px;
        color: #111827;
        font-size: 20px;
        font-weight: 800;
        letter-spacing: -.35px;
    }

    .sqab-mobile-submit-button {
        width: 172px;
        min-width: 172px;
        min-height: 46px;
        margin: 0;
        padding: 0 16px;
        border: 0;
        border-radius: 999px;
        background: #f59e0b;
        color: #fff;
        box-shadow: 0 5px 14px rgba(245, 158, 11, .20);
        font-size: 15px;
        font-weight: 800;
        line-height: 1;
        text-align: center;
        white-space: nowrap;
        cursor: pointer;
        appearance: none;
        -webkit-tap-highlight-color: transparent;
    }

    .sqab-mobile-submit-button.is-incomplete {
        background: #f59e0b;
    }

    .sqab-mobile-submit-button.is-complete {
        background: #16a34a;
        box-shadow: 0 5px 14px rgba(22, 163, 74, .20);
    }

    .sqab-submit-progress-notice {
        right: 18px;
        left: auto;
        bottom: 90px;
        max-width: 360px;
    }
}

/* v1.6.0 - thêm thời gian làm bài vào thanh tiến độ cố định. */
.sqab-mobile-stats {
    min-width: 0;
    display: grid;
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
    align-items: center;
    gap: 10px;
}

.sqab-mobile-time {
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 1px;
    color: #0f172a;
    line-height: 1.15;
}

.sqab-mobile-time-label {
    display: block;
    overflow: hidden;
    color: #475569;
    font-size: 13px;
    font-weight: 600;
    white-space: nowrap;
    text-overflow: ellipsis;
}

.sqab-mobile-time-value {
    display: block;
    margin-top: 3px;
    color: #64748b;
    font-size: 20px;
    font-weight: 800;
    letter-spacing: -.4px;
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}

@media (max-width: 700px) {
    .sqab-mobile-submit-bar {
        grid-template-columns: minmax(0, 1fr) minmax(132px, 40%);
    }
    .sqab-mobile-stats { gap: 8px; }
    .sqab-mobile-progress-label,
    .sqab-mobile-time-label { font-size: 11px; }
    .sqab-mobile-progress-count { font-size: 21px; }
    .sqab-mobile-time-value { font-size: 17px; }
}

@media (max-width: 380px) {
    .sqab-mobile-submit-bar {
        grid-template-columns: minmax(0, 1fr) minmax(118px, 39%);
    }
    .sqab-mobile-stats { gap: 6px; }
    .sqab-mobile-progress-label,
    .sqab-mobile-time-label { font-size: 10px; }
    .sqab-mobile-progress-count { font-size: 19px; }
    .sqab-mobile-time-value { font-size: 15px; }
}

@media (min-width: 701px) {
    .sqab-mobile-submit-bar {
        grid-template-columns: 210px 172px;
    }
    .sqab-mobile-stats {
        grid-template-columns: 82px 118px;
        gap: 8px;
    }
    .sqab-mobile-progress-label,
    .sqab-mobile-time-label {
        font-size: 9px;
        font-weight: 700;
        color: #64748b;
    }
    .sqab-mobile-progress-count { font-size: 19px; }
    .sqab-mobile-time-value { font-size: 16px; }
}

/* v1.6.7 - iPhone/Safari full overlay + internal popup scroll.
 *
 * - Không dùng visualViewport.
 * - Overlay fixed phủ kín toàn bộ web viewport.
 * - Document phía sau bị khóa hoàn toàn.
 * - Chỉ khung popup trắng là nested scroller.
 * - 100svh giữ popup trong vùng an toàn khi browser chrome đang mở.
 * - safe-area hỗ trợ tai thỏ / Dynamic Island / Home Indicator.
 */
@media (max-width: 700px) {
    html.sqab-lock {
        overflow: hidden !important;
        overscroll-behavior: none !important;
        height: 100% !important;
    }

    html.sqab-lock body.sqab-body-lock {
        position: fixed !important;
        top: var(--sqab-lock-y, 0px) !important;
        left: 0 !important;
        right: 0 !important;
        width: 100% !important;
        max-width: 100% !important;
        overflow: hidden !important;
        overscroll-behavior: none !important;
    }

    .sqab-overlay {
        position: fixed !important;
        z-index: 2147483000 !important;
        inset: auto 0 auto 0 !important;
        top: 0 !important;
        width: 100vw !important;
        height: 100vh !important;
        height: 100svh !important;
        min-height: 100svh !important;
        max-height: 100svh !important;
        display: flex !important;
        align-items: stretch !important;
        justify-content: stretch !important;
        padding-top: max(8px, env(safe-area-inset-top, 0px)) !important;
        padding-right: 0 !important;
        padding-bottom: 0 !important;
        padding-left: 0 !important;
        overflow: hidden !important;
        overscroll-behavior: none !important;
        -webkit-overflow-scrolling: auto !important;
        background: #374151 !important;
        box-sizing: border-box !important;
    }

    .sqab-overlay .sqab-modal {
        flex: 1 1 auto !important;
        width: 100% !important;
        max-width: none !important;
        min-width: 0 !important;
        height: 100% !important;
        min-height: 0 !important;
        max-height: none !important;
        margin: 0 !important;
        padding: 0 !important;
        border: 0 !important;
        border-radius: 32px 32px 0 0 !important;
        overflow-x: hidden !important;
        overflow-y: auto !important;
        overscroll-behavior-y: contain !important;
        -webkit-overflow-scrolling: touch !important;
        background: #fff !important;
        box-shadow: 0 -8px 36px rgba(0, 0, 0, .24) !important;
        touch-action: pan-y !important;
        scroll-behavior: smooth;
    }

    .sqab-overlay .sqab-header {
        padding-top: max(40px, calc(env(safe-area-inset-top, 0px) + 22px)) !important;
    }

    .sqab-overlay .sqab-body {
        padding-bottom: max(34px, calc(22px + env(safe-area-inset-bottom, 0px))) !important;
    }

    .sqab-overlay .sqab-close {
        top: max(14px, env(safe-area-inset-top, 0px)) !important;
        right: max(18px, calc(12px + env(safe-area-inset-right, 0px))) !important;
    }

    .sqab-overlay a.sqab-google {
        display: inline-block;
        padding: 2px 3px;
        font-weight: 700 !important;
        -webkit-tap-highlight-color: rgba(9, 109, 204, .16);
    }
}