/* B2 Speaking Part 4 visual layer.
 * Part 1 supplies the shared OpenVoz foundation; this file preserves Part 4's
 * extended discussion, completion, and existing assessment presentation.
 */

.part4-workspace {
    flex-grow: 1;
}

.part4-task-layout {
    align-items: stretch;
    display: grid;
    gap: var(--ov-space-3);
    grid-template-columns: minmax(340px, 0.88fr) minmax(0, 1.12fr);
}

.part4-topic-panel,
.part4-conversation-panel {
    background: var(--ov-white);
    border: 1px solid var(--ov-neutral-200);
    border-radius: 18px;
    box-shadow: 0 4px 18px rgba(16, 35, 63, 0.07);
    min-width: 0;
    overflow: hidden;
}

.part4-topic-panel {
    align-items: stretch;
    display: flex;
    flex-direction: column;
    padding: var(--ov-space-3);
}

.topic-image-frame {
    align-items: center;
    background: var(--ov-neutral-100);
    border-radius: var(--ov-radius-md);
    display: flex;
    flex: 1;
    justify-content: center;
    min-height: 420px;
    overflow: hidden;
}

.topic-image-frame img {
    display: block;
    height: auto;
    max-height: 600px;
    object-fit: contain;
    width: 100%;
}

.topic-guidance {
    background: var(--ov-blue-100);
    border: 1px solid rgba(22, 78, 166, 0.14);
    border-radius: var(--ov-radius-md);
    margin-top: var(--ov-space-2);
    padding: 14px var(--ov-space-2);
}

.topic-guidance p:last-child {
    color: var(--ov-ink-700);
    font-size: 0.84rem;
    line-height: 1.55;
    margin: 7px 0 0;
}

.secondary-action {
    align-items: center;
    background: var(--ov-white);
    border: 1px solid #b9c7da;
    border-radius: var(--ov-radius-sm);
    color: var(--ov-blue-700);
    cursor: pointer;
    display: inline-flex;
    font: inherit;
    font-weight: 750;
    justify-content: center;
    margin-top: var(--ov-space-2);
    min-height: 44px;
    padding: 10px 16px;
    transition: background-color 160ms ease, border-color 160ms ease;
    width: 100%;
}

.secondary-action:hover {
    background: var(--ov-blue-100);
    border-color: rgba(22, 78, 166, 0.36);
}

.secondary-action:focus-visible {
    outline: 3px solid var(--ov-yellow-500);
    outline-offset: 3px;
}

.part4-conversation-panel {
    display: flex;
    flex-direction: column;
}

.part4-interaction {
    background: #f9fbfd;
    display: flex;
    flex: 1;
    flex-direction: column;
    min-height: 430px;
    padding: var(--ov-space-3);
}

.part4-transcript {
    color: var(--ov-ink-700);
    flex: 1;
    min-height: 320px;
    overflow-y: auto;
    scroll-behavior: smooth;
}

.part4-transcript > div {
    border-radius: var(--ov-radius-md);
    font-size: 1rem;
    line-height: 1.6;
    margin: 0 0 var(--ov-space-2);
    max-width: 86%;
    padding: 13px var(--ov-space-2);
    width: fit-content;
}

.part4-transcript > .chatbot {
    background: var(--ov-white);
    border: 1px solid var(--ov-neutral-200);
    color: var(--ov-ink-900);
}

.part4-transcript > .chatbot strong {
    color: var(--ov-blue-700);
}

.part4-transcript > .user {
    background: var(--ov-blue-700);
    color: var(--ov-white);
    margin-left: auto;
}

.part4-interaction audio {
    margin: var(--ov-space-2) auto 0;
    max-width: 100%;
}

.part4-conversation-panel .btn-primary {
    align-items: center;
    background: var(--ov-blue-700);
    border: 3px solid var(--ov-white);
    border-radius: 999px;
    box-shadow: 0 0 0 2px var(--ov-blue-700), 0 8px 20px rgba(22, 78, 166, 0.22);
    color: var(--ov-white);
    cursor: pointer;
    display: inline-flex;
    font: inherit;
    font-size: 0.82rem;
    font-weight: 750;
    height: 64px;
    justify-content: center;
    line-height: 1.15;
    margin: 0;
    max-width: 118px;
    min-width: 78px;
    padding: 0 14px;
    text-align: center;
    transition: background-color 160ms ease, box-shadow 160ms ease;
    width: auto;
}

.part4-conversation-panel .btn-primary:hover:not(:disabled) {
    background: #103f8b;
    box-shadow: 0 0 0 2px #103f8b, 0 10px 24px rgba(22, 78, 166, 0.28);
}

.part4-conversation-panel .btn-primary:focus-visible {
    outline: 3px solid var(--ov-yellow-500);
    outline-offset: 5px;
}

.part4-conversation-panel .btn-primary.listening,
.part4-conversation-panel .btn-primary:disabled {
    background: #a62b2b;
    box-shadow: 0 0 0 2px #a62b2b, 0 8px 20px rgba(166, 43, 43, 0.22);
}

.assessment-panel {
    background: linear-gradient(180deg, var(--ov-white) 0%, #f5f8ff 100%);
    border: 1px solid rgba(22, 78, 166, 0.2);
    border-radius: var(--ov-radius-md);
    box-shadow: 0 8px 24px rgba(16, 35, 63, 0.08);
    color: var(--ov-ink-900);
    margin-top: var(--ov-space-3);
    padding: var(--ov-space-3);
}

.assessment-heading {
    align-items: center;
    display: flex;
    gap: 12px;
    margin-bottom: var(--ov-space-2);
}

.assessment-heading h3 {
    color: var(--ov-ink-900);
    font-size: 1.2rem;
    margin: 2px 0 0;
}

.assessment-mark {
    align-items: center;
    background: var(--ov-green-100);
    border-radius: 50%;
    color: var(--ov-green-700);
    display: inline-flex;
    flex: 0 0 38px;
    font-weight: 800;
    height: 38px;
    justify-content: center;
}

#assessmentResult {
    color: var(--ov-ink-700);
    line-height: 1.65;
}

.feedback-card:not(:empty) {
    background: var(--ov-green-100);
    border: 1px solid rgba(22, 114, 74, 0.2);
    border-radius: var(--ov-radius-md);
    color: #145c3d;
    line-height: 1.6;
    margin-top: var(--ov-space-2);
    padding: var(--ov-space-2);
    white-space: pre-wrap;
}

#cta-overlay h2 {
    color: var(--ov-white);
}

@media (max-width: 899px) {
    .part4-task-layout {
        grid-template-columns: 1fr;
    }

    .topic-image-frame {
        min-height: 300px;
    }

    .part4-interaction {
        min-height: 380px;
    }
}

@media (max-width: 767px) {
    .part4-task-layout {
        gap: var(--ov-space-2);
    }

    .part4-topic-panel,
    .part4-conversation-panel {
        border-radius: var(--ov-radius-md);
    }

    .part4-topic-panel,
    .part4-interaction {
        padding: var(--ov-space-2);
    }

    .topic-image-frame {
        min-height: 240px;
    }

    .part4-interaction {
        min-height: 340px;
    }

    .part4-transcript {
        min-height: 260px;
    }

    .part4-transcript > div {
        max-width: 92%;
    }

    .assessment-panel {
        padding: var(--ov-space-2);
    }
}

@media (max-width: 479px) {
    .topic-image-frame {
        min-height: 190px;
    }

    .topic-guidance {
        padding: 12px 14px;
    }

    .part4-interaction {
        min-height: 310px;
    }

    .part4-transcript {
        min-height: 230px;
    }
}