.sarf-lesson {
    --primary: #145c45;
    --primary-dark: #0d4232;
    --secondary: #d4a94e;
    --light: #f4f8f5;
    --text: #26332d;
    --muted: #69766e;
    --border: #dce7df;
    --white: #fff;
    --blue: #eaf3fc;
    --green: #e9f5ed;
    --yellow: #fff7df;
    box-sizing: border-box;
    max-width: 1000px;
    margin: 20px auto;
    padding: 20px;
    background: var(--white);
    color: var(--text);
    font-family: "Noto Sans Bengali", "Hind Siliguri", "SolaimanLipi", sans-serif;
    line-height: 1.9;
    overflow-wrap: anywhere;
}

.sarf-lesson *,
.sarf-lesson *::before,
.sarf-lesson *::after {
    box-sizing: border-box;
}

.sarf-lesson h1,
.sarf-lesson h2,
.sarf-lesson h3,
.sarf-lesson h4 {
    color: var(--primary-dark);
    line-height: 1.5;
}

.sarf-lesson h1 {
    margin: 12px 0;
    font-size: clamp(25px, 5vw, 38px);
}

.sarf-lesson h2 {
    margin: 38px 0 18px;
    padding-left: 13px;
    border-left: 5px solid var(--secondary);
    font-size: clamp(21px, 4vw, 27px);
}

.sarf-lesson h3 {
    margin-top: 25px;
    font-size: 20px;
}

.sarf-lesson p {
    margin: 12px 0;
}

.sarf-lesson .subtitle,
.sarf-lesson .footer-note {
    color: var(--muted);
}

.sarf-lesson .subtitle {
    font-size: 16px;
}

.sarf-lesson .lesson-header {
    margin-bottom: 25px;
    padding: 35px 25px;
    border-bottom: 5px solid var(--secondary);
    border-radius: 18px;
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    color: #fff;
    text-align: center;
}

.sarf-lesson .lesson-header h1,
.sarf-lesson .next-lesson,
.sarf-lesson .next-lesson h2 {
    color: #fff;
}

.sarf-lesson .lesson-header .arabic-title {
    margin: 15px 0;
    color: #ffe7a5;
    direction: rtl;
    font-family: "Noto Naskh Arabic", serif;
    font-size: 38px;
}

.sarf-lesson .lesson-header p {
    color: #e9f5ed;
}

.sarf-lesson .badge {
    display: inline-block;
    padding: 5px 14px;
    border-radius: 30px;
    background: #e8c66d;
    color: #26332d;
    font-size: 13px;
    font-weight: bold;
}

.sarf-lesson .info-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    margin: 20px 0;
}

.sarf-lesson .info-card {
    padding: 15px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--light);
}

.sarf-lesson .info-card strong {
    display: block;
    color: var(--primary);
}

.sarf-lesson .box,
.sarf-lesson .quiz {
    margin: 18px 0;
    padding: 18px;
    border: 1px solid var(--border);
    border-radius: 12px;
}

.sarf-lesson .success-box {
    border-left: 5px solid #2c8b54;
    background: var(--green);
}

.sarf-lesson .info-box {
    border-left: 5px solid #3479b8;
    background: var(--blue);
}

.sarf-lesson .warning-box {
    border-left: 5px solid #d7a326;
    background: var(--yellow);
}

.sarf-lesson .arabic-box {
    margin: 20px 0;
    padding: 25px 15px;
    border: 1px solid #d7e6d8;
    border-radius: 14px;
    background: #f5f8f2;
    text-align: center;
}

.sarf-lesson .arabic {
    color: var(--primary-dark);
    direction: rtl;
    font-family: "Noto Naskh Arabic", "Amiri", serif;
    font-size: 27px;
    line-height: 2;
    unicode-bidi: isolate;
}

.sarf-lesson .pronunciation {
    margin: 6px 0;
    color: #a06c17;
    font-weight: bold;
}

.sarf-lesson .english {
    color: #52667a;
    font-style: italic;
}

.sarf-lesson .table-wrap {
    margin: 20px 0;
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: 10px;
}

.sarf-lesson table {
    width: 100%;
    min-width: 550px;
    border-collapse: collapse;
    background: #fff;
}

.sarf-lesson th {
    padding: 13px;
    background: var(--primary);
    color: #fff;
    text-align: left;
}

.sarf-lesson td {
    padding: 12px;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

.sarf-lesson tr:nth-child(even) {
    background: #f7faf8;
}

.sarf-lesson td.arabic-cell {
    color: var(--primary-dark);
    direction: rtl;
    font-family: "Noto Naskh Arabic", serif;
    font-size: 23px;
    text-align: center;
}

.sarf-lesson .diagram {
    margin: 20px 0;
    padding: 20px;
    border: 1px solid var(--border);
    border-radius: 15px;
    background: #f7faf8;
    text-align: center;
}

.sarf-lesson .diagram-root {
    display: inline-block;
    min-width: 180px;
    padding: 14px;
    border-radius: 10px;
    background: var(--primary);
    color: #fff;
    font-weight: bold;
}

.sarf-lesson .diagram-arrow {
    margin: 8px;
    color: var(--secondary);
    font-size: 28px;
}

.sarf-lesson .diagram-items {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
    margin-top: 10px;
}

.sarf-lesson .diagram-item {
    padding: 12px 5px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: #fff;
}

.sarf-lesson .diagram-item .arabic {
    font-size: 23px;
}

.sarf-lesson .number-list {
    padding-left: 25px;
}

.sarf-lesson .number-list li {
    margin: 10px 0;
}

.sarf-lesson .quiz {
    background: #f7faf8;
}

.sarf-lesson .quiz-item {
    padding: 12px 0;
    border-bottom: 1px dashed #cbd8ce;
}

.sarf-lesson .answer {
    color: var(--primary);
    font-weight: bold;
}

.sarf-lesson .reference {
    padding: 20px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: #f7f8fa;
}

.sarf-lesson .next-lesson {
    margin-top: 30px;
    padding: 25px;
    border-radius: 15px;
    background: var(--primary-dark);
    text-align: center;
}

.sarf-lesson .next-lesson ul {
    display: inline-block;
    text-align: left;
}

.sarf-lesson .next-lesson h2 {
    margin-top: 5px;
    padding: 0;
    border: 0;
}

.sarf-lesson .footer-note {
    margin-top: 30px;
    padding-top: 15px;
    border-top: 1px solid var(--border);
    font-size: 13px;
    text-align: center;
}

@media (max-width: 600px) {
    .sarf-lesson {
        padding: 12px;
    }

    .sarf-lesson .lesson-header {
        padding: 25px 15px;
    }

    .sarf-lesson .info-grid,
    .sarf-lesson .diagram-items {
        grid-template-columns: 1fr;
    }

    .sarf-lesson .arabic {
        font-size: 24px;
    }

    .sarf-lesson .table-wrap table {
        min-width: 520px;
    }
}