.lessons-panel-shell {
    height: calc(100vh - 140px);
}

.lessons-panel {
    height: 100%;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: #0b1833;
    color: #fff;
}

.lesson-single-wrap {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.lesson-dots {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    padding-top: 4px;
}

.lesson-dot {
    width: 12px;
    height: 12px;
    border-radius: 999px;
    border: none;
    background: rgba(255,255,255,0.22);
    cursor: pointer;
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}

    .lesson-dot:hover {
        transform: scale(1.1);
    }

    .lesson-dot.active {
        background: #8b5cf6;
        box-shadow: 0 0 0 4px rgba(139,92,246,.18);
        transform: scale(1.15);
    }

    .lesson-dot.done {
        background: #22c55e;
    }

.lesson-progress-text {
    text-align: center;
    color: rgba(255,255,255,0.82);
    font-size: 13px;
    font-weight: 700;
}

    .lesson-progress-text.top {
        margin-bottom: 2px;
    }

.lesson-single-card {
    background: linear-gradient(180deg, rgba(255,255,255,0.10), rgba(255,255,255,0.06));
    border: 1px solid rgba(255,255,255,0.10);
    border-radius: 22px;
    padding: 18px;
    box-shadow: 0 16px 32px rgba(0,0,0,0.22);
}

.lesson-single-head {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 16px;
}

.lesson-single-badge {
    width: 46px;
    height: 46px;
    min-width: 46px;
    border-radius: 999px;
    display: grid;
    place-items: center;
    font-weight: 800;
    font-size: 18px;
    color: #fff;
    background: linear-gradient(180deg, #7c3aed, #5b21b6);
    box-shadow: 0 10px 20px rgba(124,58,237,.28);
}

.lesson-single-heading-text {
    min-width: 0;
}

.lesson-single-title {
    color: #fff;
    font-weight: 800;
    font-size: 22px;
    line-height: 1.2;
}

.lesson-single-subtitle {
    margin-top: 4px;
    color: rgba(255,255,255,0.72);
    font-size: 13px;
    font-weight: 600;
}

.lesson-single-body {
    color: #eef4ff;
}

.lesson-html-fix,
.lesson-html-fix * {
    color: #eef4ff !important;
}

    .lesson-html-fix a {
        color: #9ec5ff !important;
    }

    .lesson-html-fix strong,
    .lesson-html-fix b {
        color: #ffffff !important;
    }

    .lesson-html-fix ul,
    .lesson-html-fix ol {
        padding-left: 20px;
    }

    .lesson-html-fix p,
    .lesson-html-fix li,
    .lesson-html-fix span,
    .lesson-html-fix div,
    .lesson-html-fix h1,
    .lesson-html-fix h2,
    .lesson-html-fix h3,
    .lesson-html-fix h4,
    .lesson-html-fix h5,
    .lesson-html-fix h6 {
        color: #eef4ff !important;
    }

.acc-html.lesson-html-fix {
    background: rgba(255,255,255,0.05);
    border-radius: 16px;
    padding: 16px;
    line-height: 1.75;
    font-size: 15px;
}

.acc-actions {
    margin-top: 16px;
    display: flex;
    justify-content: flex-start;
}

.lesson-footer-nav {
    padding: 14px 16px 16px 16px;
    background: linear-gradient(to top, #0b1833 70%, rgba(11,24,51,0.82) 100%, transparent);
    border-top: 1px solid rgba(255,255,255,0.08);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.lesson-nav-btn {
    border: none;
    border-radius: 14px;
    padding: 12px 18px;
    font-weight: 800;
    font-size: 14px;
    cursor: pointer;
    transition: transform .18s ease, opacity .18s ease, box-shadow .18s ease;
}

    .lesson-nav-btn:hover:not(:disabled) {
        transform: translateY(-1px);
    }

    .lesson-nav-btn:disabled {
        opacity: .45;
        cursor: not-allowed;
    }

.lesson-nav-secondary {
    background: rgba(255,255,255,0.08);
    color: #fff;
    border: 1px solid rgba(255,255,255,0.10);
}

.lesson-nav-primary {
    background: linear-gradient(180deg, #7c3aed, #5b21b6);
    color: #fff;
    box-shadow: 0 10px 20px rgba(124,58,237,.25);
}

.lesson-nav-quiz {
    white-space: nowrap;
}

@media (max-width: 768px) {
    .lesson-single-wrap {
        padding: 12px;
    }

    .lesson-single-card {
        padding: 14px;
        border-radius: 18px;
    }

    .lesson-single-title {
        font-size: 18px;
    }

    .lesson-single-badge {
        width: 40px;
        height: 40px;
        min-width: 40px;
        font-size: 16px;
    }

    .lesson-footer-nav {
        flex-wrap: wrap;
    }

    .lesson-nav-btn,
    .lesson-nav-quiz {
        flex: 1;
    }
}