.lesson-chat {
    margin-top: 22px;
    padding: 20px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: #fff;
    box-shadow: var(--soft-shadow);
}

.lesson-chat-heading {
    display: flex;
    align-items: center;
    gap: 12px;
}

.lesson-chat-icon {
    display: grid;
    flex: 0 0 38px;
    width: 38px;
    height: 38px;
    place-items: center;
    border-radius: 11px;
    color: #fff;
    background: var(--purple);
    font-size: 18px;
}

.lesson-chat-eyebrow {
    color: var(--purple-dark);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: .08em;
    text-transform: uppercase;
}

.lesson-chat h2 {
    margin: 2px 0 0;
    color: var(--ink);
    font-size: 18px;
    line-height: 1.3;
}

.lesson-chat-limit {
    margin-left: auto;
    padding: 7px 10px;
    border-radius: 999px;
    color: #4634aa;
    background: var(--purple-soft);
    font-size: 11px;
    font-weight: 800;
    white-space: nowrap;
}

.lesson-chat-description {
    margin: 14px 0 0;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.6;
}

.lesson-chat-upgrade {
    margin-top: 16px;
    padding: 18px;
    border: 1px solid #ded6ff;
    border-radius: 14px;
    background: linear-gradient(135deg, #f5f1ff, #f9fbff);
}

.lesson-chat-upgrade-intro {
    margin: 0;
    color: var(--ink);
    font-size: 14px;
    font-weight: 700;
    line-height: 1.55;
}

.lesson-chat-benefits {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 18px;
    margin: 17px 0 0;
    padding: 0;
    list-style: none;
}

.lesson-chat-benefits li {
    display: flex;
    align-items: flex-start;
    gap: 9px;
    color: var(--ink);
    font-size: 12px;
    line-height: 1.5;
}

.lesson-chat-benefits i {
    flex: 0 0 auto;
    color: var(--purple);
    font-size: 16px;
    line-height: 1.2;
}

.lesson-chat-upgrade-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px 16px;
    margin-top: 17px;
}

.lesson-chat-existing-subscriber {
    color: var(--purple-dark);
    font-size: 12px;
    font-weight: 700;
    text-decoration: underline;
    text-underline-offset: 3px;
}

.lesson-chat-sign-in {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border-radius: 9px;
    color: #fff;
    background: var(--purple);
    font-size: 13px;
    font-weight: 800;
}

.lesson-chat-sign-in:hover,
.lesson-chat-sign-in:focus-visible {
    background: var(--purple-dark);
}

.lesson-chat-messages {
    display: flex;
    flex-direction: column;
    gap: 12px;
    max-height: 360px;
    min-height: 0;
    margin: 16px 0 0;
    padding: 0;
    overflow-y: auto;
    list-style: none;
    scrollbar-gutter: stable;
}

.lesson-chat-messages:empty {
    display: none;
}

.lesson-chat-message {
    max-width: min(88%, 660px);
    padding: 11px 14px;
    border-radius: 12px;
    color: var(--ink);
    background: #f2f4fa;
    font-size: 13px;
    line-height: 1.6;
}

.lesson-chat-message-user {
    align-self: flex-end;
    color: #fff;
    background: var(--purple);
}

.lesson-chat-message-assistant {
    align-self: flex-start;
    border: 1px solid var(--line);
}

.lesson-chat-message strong {
    display: block;
    margin-bottom: 3px;
    font-size: 11px;
    line-height: 1.3;
}

.lesson-chat-message p {
    margin: 0;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}

.lesson-chat-form {
    margin-top: 16px;
}

.lesson-chat-form label {
    display: block;
    margin-bottom: 7px;
    color: var(--ink);
    font-size: 12px;
    font-weight: 800;
}

.lesson-chat-form textarea {
    display: block;
    width: 100%;
    min-height: 76px;
    padding: 11px 12px;
    resize: vertical;
    border: 1px solid var(--line-strong);
    border-radius: 10px;
    outline: 0;
    color: var(--ink);
    background: #fff;
    font: inherit;
    font-size: 13px;
    line-height: 1.5;
}

.lesson-chat-form textarea:focus-visible {
    border-color: var(--purple);
    box-shadow: 0 0 0 3px rgba(96, 64, 255, .12);
}

.lesson-chat-form-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-top: 9px;
}

.lesson-chat-hint {
    color: var(--muted);
    font-size: 11px;
}

.lesson-chat-form button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-width: 86px;
    padding: 9px 13px;
    border: 0;
    border-radius: 9px;
    color: #fff;
    background: var(--purple);
    font-size: 12px;
    font-weight: 800;
    cursor: pointer;
}

.lesson-chat-form button:hover:not(:disabled),
.lesson-chat-form button:focus-visible:not(:disabled) {
    background: var(--purple-dark);
}

.lesson-chat-form button:disabled {
    cursor: not-allowed;
    opacity: .56;
}

.lesson-chat-status {
    margin: 10px 0 0;
    color: var(--muted);
    font-size: 11px;
    line-height: 1.5;
}

.lesson-chat-status.is-error {
    color: #ad2537;
}

body.theme-dark .lesson-chat {
    border-color: #353c5d;
    background: #1b2138;
}

body.theme-dark .lesson-chat h2,
body.theme-dark .lesson-chat-form label {
    color: #f6f7ff;
}

body.theme-dark .lesson-chat-description,
body.theme-dark .lesson-chat-hint,
body.theme-dark .lesson-chat-status {
    color: #b9c0d8;
}

body.theme-dark .lesson-chat-upgrade {
    border-color: #51457b;
    background: linear-gradient(135deg, #292440, #242d44);
}

body.theme-dark .lesson-chat-upgrade-intro,
body.theme-dark .lesson-chat-benefits li {
    color: #f6f7ff;
}

body.theme-dark .lesson-chat-benefits i,
body.theme-dark .lesson-chat-existing-subscriber {
    color: #c7baff;
}

body.theme-dark .lesson-chat-limit {
    color: #dfd7ff;
    background: #39305f;
}

body.theme-dark .lesson-chat-message-assistant {
    border-color: #394161;
    color: #f6f7ff;
    background: #293149;
}

body.theme-dark .lesson-chat-form textarea {
    border-color: #46506e;
    color: #f6f7ff;
    background: #242b44;
}

body.theme-dark .lesson-chat-status.is-error {
    color: #ff9baa;
}

@media (max-width: 600px) {
    .lesson-chat {
        padding: 16px;
    }

    .lesson-chat-heading {
        flex-wrap: wrap;
    }

    .lesson-chat-limit {
        margin-left: 50px;
    }

    .lesson-chat-hint {
        max-width: 165px;
    }

    .lesson-chat-benefits {
        grid-template-columns: 1fr;
    }
}