.lecture-content {
        direction: rtl;
        text-align: right;
        color: inherit;
        line-height: 1.9;

        width: calc(100% + 56px);
        margin: -28px;

        overflow: hidden;
    }

    .lecture-content *,
    .lecture-content *::before,
    .lecture-content *::after {
        box-sizing: border-box;
    }

    /* =========================
       HERO
    ========================== */

    .lecture-content .hero {
        direction: rtl;
        text-align: right;

        background: linear-gradient(135deg, #0f4c81, #1769aa);
        color: #fff;

        padding: 32px;
        margin: 0 0 20px;

        border-radius: 0 0 18px 18px;

        width: 100%;
    }

    .lecture-content .hero .course {
        font-size: 16px;
        opacity: .9;
        margin-bottom: 6px;
    }

    .lecture-content .hero h1 {
        margin: 0;
        font-size: clamp(25px, 4vw, 38px);
        line-height: 1.45;
    }

    .lecture-content .hero p {
        margin: 8px 0 0;
        font-size: 17px;
        opacity: .95;
    }

    /* =========================
       SECTION
    ========================== */

    .lecture-content .section {
        direction: rtl;
        text-align: right;

        background: var(--bg-card);

        border: 1px solid var(--border);
        border-radius: 16px;

        padding: 25px 28px;
        margin: 0 0 18px;

        width: 100%;
    }

    .lecture-content .section h2 {
        color: #0f4c81;

        font-size: 25px;
        line-height: 1.5;

        margin: 0 0 18px;

        border-right: 5px solid #1d82c4;
        padding-right: 13px;
    }

    .lecture-content .section h3 {
        color: #1769aa;

        font-size: 21px;
        line-height: 1.5;

        margin: 22px 0 10px;
    }

    .lecture-content p {
        font-size: 17px;
        margin: 9px 0;
    }

    .lecture-content ul,
    .lecture-content ol {
        padding-right: 24px;
        padding-left: 0;
        margin-top: 10px;
        margin-bottom: 10px;
    }

    .lecture-content li {
        font-size: 17px;
        margin-bottom: 7px;
    }

    /* =========================
       OBJECTIVES
    ========================== */

    .lecture-content .objectives {
        direction: rtl;
        text-align: right;

        background: #edf4fb;

        border-right: 5px solid #2196d3;

        padding: 18px 22px;

        border-radius: 13px;

        width: 100%;
    }

    .lecture-content .objectives p {
        margin-top: 0;
    }

    .lecture-content .objectives ul {
        margin-bottom: 0;
    }

    /* =========================
       TERM
    ========================== */

    .lecture-content .term {
        display: inline-block;

        direction: ltr;
        unicode-bidi: isolate;

        background: #edf4fb;

        color: #0f4c81;

        padding: 1px 8px;

        border-radius: 7px;

        font-weight: 700;

        margin: 0 2px;

        line-height: 1.6;
    }

    /* =========================
       ENGLISH
    ========================== */

    .lecture-content .english {
        direction: ltr;
        unicode-bidi: isolate;

        text-align: left;

        display: block;

        background: var(--bg-card);

        border: 1px solid var(--border);
        border-left: 4px solid #1769aa;

        padding: 13px 17px;

        margin: 15px 0;

        border-radius: 9px;

        font-family: Arial, sans-serif;

        font-size: 17px;
        line-height: 1.7;
    }

    /* =========================
       EXAMPLE
    ========================== */

    .lecture-content .example {
        direction: rtl;
        text-align: right;

        background: var(--bg-card);

        border: 1px solid var(--border);

        border-radius: 12px;

        padding: 17px;

        margin: 15px 0;

        width: 100%;
    }

    .lecture-content .example-title {
        color: #0f4c81;

        font-weight: 700;
        font-size: 18px;

        margin-bottom: 8px;
    }

    /* =========================
       IMPORTANT
    ========================== */

    .lecture-content .important {
        direction: rtl;
        text-align: right;

        background: var(--bg-card);

        border: 1px solid var(--border);

        border-right: 5px solid #f0ad00;

        padding: 15px 18px;

        border-radius: 10px;

        margin: 15px 0;

        width: 100%;
    }

    /* =========================
       SUCCESS
    ========================== */

    .lecture-content .success {
        direction: rtl;
        text-align: right;

        background: var(--bg-card);

        border: 1px solid var(--border);

        border-right: 5px solid #2e9d55;

        padding: 15px 18px;

        border-radius: 10px;

        margin: 15px 0;

        width: 100%;
    }

    /* =========================
       ANALYSIS
    ========================== */

    .lecture-content .analysis {
        direction: ltr;
        unicode-bidi: isolate;

        text-align: center;

        background: var(--bg-card);

        border: 1px solid var(--border);

        border-radius: 12px;

        padding: 16px;

        margin: 15px 0;

        font-family: Arial, sans-serif;

        font-size: 19px;
        line-height: 1.6;

        width: 100%;

        overflow-x: auto;
    }

    .lecture-content .analysis .part {
        display: inline-block;

        direction: ltr;
        unicode-bidi: isolate;

        padding: 7px 11px;

        margin: 3px;

        border-radius: 8px;

        font-weight: 700;
    }

    .lecture-content .prefix {
        background: #fff0f0;
        color: #b42318;
    }

    .lecture-content .root {
        background: #eef9f1;
        color: #217346;
    }

    .lecture-content .suffix {
        background: #edf2ff;
        color: #2854a6;
    }

    /* =========================
       TABLE
    ========================== */

    .lecture-content .table-wrapper {
        direction: rtl;

        overflow-x: auto;

        width: 100%;

        margin: 16px 0;

        -webkit-overflow-scrolling: touch;
    }

    .lecture-content .table-wrapper table {
        width: 100%;

        min-width: 520px;

        border-collapse: collapse;

        background: var(--bg-card);
    }

    .lecture-content .table-wrapper th,
    .lecture-content .table-wrapper td {
        padding: 11px 10px;

        border: 1px solid var(--border);

        text-align: center;

        vertical-align: middle;
    }

    .lecture-content .table-wrapper th {
        background: #0f4c81;
        color: #fff;

        font-weight: 700;
    }

    .lecture-content .table-wrapper tr:nth-child(even) {
        background: rgba(128,128,128,.04);
    }

    .lecture-content .table-wrapper td[dir="ltr"],
    .lecture-content .table-wrapper th[dir="ltr"] {
        direction: ltr;
        unicode-bidi: isolate;
    }

    /* =========================
       FORMULA
    ========================== */

    .lecture-content .formula {
        direction: ltr;
        unicode-bidi: isolate;

        text-align: center;

        font-size: 20px;
        font-weight: 700;

        color: #0f4c81;

        background: var(--bg-card);

        border: 1px solid var(--border);

        padding: 15px;

        border-radius: 12px;

        margin: 17px 0;

        font-family: Arial, sans-serif;

        line-height: 1.6;

        width: 100%;

        overflow-x: auto;
    }

    /* =========================
       STEPS
    ========================== */

    .lecture-content .steps {
        direction: rtl;

        counter-reset: steps;

        list-style: none;

        padding: 0;

        margin: 15px 0;
    }

    .lecture-content .steps li {
        counter-increment: steps;

        position: relative;

        padding: 11px 50px 11px 12px;

        background: var(--bg-card);

        border: 1px solid var(--border);

        border-radius: 10px;

        margin-bottom: 8px;

        min-height: 48px;
    }

    .lecture-content .steps li::before {
        content: counter(steps);

        position: absolute;

        right: 12px;

        top: 50%;

        transform: translateY(-50%);

        width: 27px;
        height: 27px;

        background: #1769aa;

        color: #fff;

        border-radius: 50%;

        display: flex;

        align-items: center;
        justify-content: center;

        font-weight: 700;
    }

    /* =========================
       Q&A
    ========================== */

    .lecture-content .qa {
        direction: rtl;
        text-align: right;

        background: var(--bg-card);

        border: 1px solid var(--border);

        border-radius: 11px;

        padding: 14px 16px;

        margin-bottom: 10px;

        width: 100%;
    }

    .lecture-content .question {
        font-weight: 700;

        color: #0f4c81;

        margin-bottom: 5px;
    }

    .lecture-content .answer {
        color: inherit;
    }

    /* =========================
       FOOTER
    ========================== */

    .lecture-content .lecture-footer {
        direction: rtl;

        text-align: center;

        color: inherit;

        opacity: .7;

        padding: 18px 8px 5px;

        font-size: 14px;
    }

    /* =========================
       MOBILE
    ========================== */

    @media (max-width: 700px) {

        .lecture-content {
            width: calc(100% + 56px);
            margin: -28px;
        }

        .lecture-content .hero {
            padding: 23px 17px;

            border-radius: 0 0 15px 15px;

            margin-bottom: 12px;
        }

        .lecture-content .hero .course {
            font-size: 14px;
        }

        .lecture-content .hero h1 {
            font-size: 25px;
        }

        .lecture-content .hero p {
            font-size: 15px;
        }

        .lecture-content .section {
            padding: 18px 15px;

            margin-bottom: 12px;

            border-radius: 13px;
        }

        .lecture-content .section h2 {
            font-size: 22px;

            padding-right: 10px;

            border-right-width: 4px;

            margin-bottom: 15px;
        }

        .lecture-content .section h3 {
            font-size: 19px;

            margin-top: 19px;
        }

        .lecture-content p,
        .lecture-content li {
            font-size: 16px;

            line-height: 1.9;
        }

        .lecture-content .objectives {
            padding: 15px 14px;

            border-right-width: 4px;

            border-radius: 11px;
        }

        .lecture-content .objectives ul {
            padding-right: 20px;
        }

        .lecture-content .example {
            padding: 14px;

            border-radius: 10px;
        }

        .lecture-content .important,
        .lecture-content .success {
            padding: 13px 14px;

            border-right-width: 4px;
        }

        .lecture-content .analysis {
            padding: 13px 8px;

            font-size: 17px;

            border-radius: 10px;
        }

        .lecture-content .analysis .part {
            padding: 6px 9px;

            margin: 2px;
        }

        .lecture-content .formula {
            font-size: 17px;

            padding: 13px 8px;
        }

        .lecture-content .table-wrapper table {
            min-width: 480px;
        }

        .lecture-content .table-wrapper th,
        .lecture-content .table-wrapper td {
            padding: 9px 7px;

            font-size: 14px;
        }

        .lecture-content .steps li {
            padding: 10px 46px 10px 10px;

            font-size: 15px;
        }
    }

    /* =========================
       SMALL PHONES
    ========================== */

    @media (max-width: 400px) {

        .lecture-content .hero {
            padding: 20px 14px;
        }

        .lecture-content .hero h1 {
            font-size: 22px;
        }

        .lecture-content .section {
            padding: 16px 12px;
        }

        .lecture-content .section h2 {
            font-size: 20px;
        }

        .lecture-content p,
        .lecture-content li {
            font-size: 15px;
        }

        .lecture-content .objectives {
            padding: 13px 11px;
        }

        .lecture-content .analysis {
            font-size: 16px;
        }
    }

    /* =========================
       SPEAK BUTTON (TTS)
    ========================== */
    .lecture-content .term-with-sound {
        display: inline-flex;
        align-items: center;
        gap: 4px;
        direction: ltr;
        unicode-bidi: isolate;
        vertical-align: middle;
    }
    .lecture-content .speak-btn {
        border: none;
        background: transparent;
        color: #1769aa;
        cursor: pointer;
        font-size: 15px;
        padding: 2px 4px;
        margin: 0;
        line-height: 1;
        border-radius: 6px;
        transition: transform 0.15s ease, opacity 0.15s ease;
        flex-shrink: 0;
        touch-action: manipulation;
    }
    .lecture-content .speak-btn:hover {
        opacity: 0.8;
        transform: scale(1.08);
    }
    .lecture-content .speak-btn:active {
        transform: scale(0.92);
    }
    @media (max-width: 700px) {
        .lecture-content .speak-btn {
            font-size: 13px;
            padding: 2px 3px;
        }
    }