/* Chat Hub Styles */
.chat-container {
    flex-grow: 1;
    overflow-y: auto;
    padding: var(--spacing-xl) var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
    scroll-behavior: smooth;
}

/* Welcome Screen */
.welcome-screen {
    max-width: 600px;
    margin: clamp(16px, 8vh, 80px) auto;
    text-align: center;
}

.welcome-title {
    /* Nhỏ hơn h1 chuẩn ~27% để tiêu đề dài (TMĐT & Quảng cáo) gói trong 2 dòng
       (đo thực tế: khung 600px, 40px = 3 dòng, 38px = 2 dòng) */
    font-size: calc(var(--font-size-h1) * 0.73);
    margin-bottom: var(--spacing-md);
    background: var(--color-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.welcome-desc {
    color: var(--color-ink-lighter);
    margin-bottom: var(--spacing-xxl);
}

.quick-replies {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
}

.quick-reply-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-round);
    color: var(--color-ink-light);
    font-size: var(--font-size-caption);
    transition: all 0.2s;
}

.quick-reply-btn:hover {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

/* Messages */
.message {
    display: flex;
    max-width: 85%;
    margin: 0 auto;
    width: 100%;
}

.user-message {
    justify-content: flex-end;
    flex-direction: column;
    align-items: flex-end;
}

.user-message .message-content {
    background: var(--color-gradient);
    color: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-lg) var(--radius-lg) 0 var(--radius-lg);
    line-height: 1.6;
}

/* Đảm bảo nội dung dài (URL, chuỗi không khoảng trắng) luôn ngắt dòng, không tràn ngang */
.message-content {
    min-width: 0;
    overflow-wrap: break-word;
    word-break: break-word;
}

.user-message .message-time {
    font-size: var(--font-size-caption);
    color: var(--color-ink-lighter);
    margin-top: var(--spacing-xs);
}

.ai-message {
    justify-content: flex-start;
    gap: var(--spacing-md);
}

.ai-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-round);
    background-color: var(--color-surface);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-gold);
    flex-shrink: 0;
}

.sparkle-icon {
    width: 16px;
    height: 16px;
}

.message-body {
    flex-grow: 1;
    max-width: 90%;
    min-width: 0; /* Cho phép flex item co lại để nội dung dài (URL) ngắt dòng thay vì tràn */
}

.ai-name {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: var(--font-size-h3);
    margin-bottom: var(--spacing-sm);
}

.ai-message .message-content {
    background-color: var(--color-surface);
    padding: var(--spacing-md);
    border-radius: 0 var(--radius-lg) var(--radius-lg) var(--radius-lg);
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
}

/* Specific styling for legal codes (e.g. Nghị định 52/2013/NĐ-CP) */
.legal-code {
    font-family: var(--font-mono);
    font-size: var(--font-size-mono);
    background-color: var(--color-border);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
}

.message-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--color-ink-lighter);
}

.action-sm {
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
}

.action-sm:hover {
    background-color: var(--color-surface);
    color: var(--color-ink);
}

.rating-stars {
    display: flex;
    gap: 2px;
}

.star {
    cursor: pointer;
    color: var(--color-border);
    transition: color 0.2s;
}

.star:hover, .star.active {
    color: var(--color-gold);
}

/* Fallback message */
.fallback-msg .message-content {
    border-left: 4px solid var(--color-gold);
}

.handoff-btn {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-bg);
    border: 1px solid var(--color-primary);
    color: var(--color-primary);
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: all 0.2s;
}

.handoff-btn:hover {
    background-color: var(--color-primary);
    color: white;
}

/* Input Panel */
.input-panel-wrapper {
    padding: var(--spacing-md) var(--spacing-xl) var(--spacing-lg);
    background-color: transparent;
    border-top: none;
    flex-shrink: 0; /* Ensure input panel never shrinks */
    position: relative;
    max-width: 860px;
    margin: 0 auto;
    width: 100%;
}

/* Ô nhập tối giản kiểu Claude: text ở trên, nút gửi ở hàng dưới bên phải */
.input-panel {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 14px var(--spacing-md) 10px;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.2s, border-color 0.2s;
}

.input-panel:focus-within {
    border-color: var(--color-ink-lighter);
    box-shadow: var(--shadow-md);
}

.input-panel textarea {
    width: 100%;
    border: none;
    background: transparent;
    color: var(--color-ink);
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    line-height: 1.55;
    resize: none;
    padding: 2px var(--spacing-sm);
    max-height: 200px; /* limits auto-resize */
    outline: none;
}

.input-panel textarea::placeholder {
    color: var(--color-ink-lighter);
}

.action-btn {
    padding: var(--spacing-sm);
    color: var(--color-ink-light);
    border-radius: var(--radius-round);
}

.action-btn:hover {
    background-color: var(--color-border);
    color: var(--color-ink);
}

.send-btn {
    align-self: flex-end;
    padding: var(--spacing-sm);
    background: var(--color-ink);
    color: white;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    min-height: 36px;
    transition: background-color 0.2s ease, opacity 0.2s ease, transform 0.1s ease;
}

.send-btn:hover {
    opacity: 0.85;
}

.send-btn:active {
    transform: scale(0.94);
}

.send-btn:disabled {
    background: var(--color-surface-hover);
    color: var(--color-ink-lighter);
    box-shadow: none;
}

.input-footer {
    text-align: center;
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-caption);
    color: var(--color-ink-lighter);
}

/* Chat Responsive — mobile */
@media (max-width: 600px) {
    .input-panel-wrapper {
        padding: var(--spacing-sm) var(--spacing-md);
        /* Chừa vùng an toàn cho thanh home iPhone */
        padding-bottom: max(var(--spacing-md), env(safe-area-inset-bottom));
    }

    .input-panel {
        padding: 10px 12px 8px;
        border-radius: var(--radius-lg);
    }

    .action-btn {
        padding: var(--spacing-sm);
        /* Tăng touch target size */
        min-width: 40px;
        min-height: 40px;
    }

    .send-btn {
        min-width: 40px;
        min-height: 40px;
    }

    .input-panel textarea {
        padding: 2px 6px;
        font-size: 16px; /* >=16px mới tránh được iOS auto-zoom khi focus */
    }

    .input-footer {
        font-size: 10.5px;
        margin-top: 6px;
    }

    .chat-container {
        padding: var(--spacing-md) var(--spacing-sm);
        gap: var(--spacing-lg);
    }

    /* Bong bóng chat dùng hết bề ngang */
    .message {
        max-width: 100%;
    }

    .message-body {
        max-width: calc(100% - 44px);
    }

    .ai-name {
        font-size: 15px;
        margin-bottom: 4px;
    }

    /* Welcome screen gọn lại cho vừa màn hình nhỏ */
    .welcome-screen {
        margin: var(--spacing-lg) auto;
        padding: 0 var(--spacing-xs);
    }

    .welcome-title {
        font-size: 22px;
    }

    .welcome-desc {
        font-size: 14px;
        margin-bottom: var(--spacing-lg);
    }

    .quick-replies {
        gap: var(--spacing-sm);
    }

    .quick-reply-btn {
        width: 100%;
        padding: 12px var(--spacing-md);
        font-size: 14px;
    }
}

/* ===== Bổ sung cho bản production (markdown + streaming) ===== */

/* Markdown trong câu trả lời AI */
.ai-message .message-content p { margin: 0 0 0.6em; }
.ai-message .message-content p:last-child { margin-bottom: 0; }
.ai-message .message-content ul,
.ai-message .message-content ol { margin: 0.4em 0 0.6em; padding-left: 1.4em; }
.ai-message .message-content li { margin: 0.2em 0; }
.ai-message .message-content h1,
.ai-message .message-content h2,
.ai-message .message-content h3,
.ai-message .message-content h4 {
    font-family: 'Be Vietnam Pro', sans-serif;
    font-size: 1.05em;
    font-weight: 700;
    margin: 0.8em 0 0.4em;
}
.ai-message .message-content code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85em;
    background: rgba(0, 134, 227, 0.08);
    padding: 0.1em 0.35em;
    border-radius: 4px;
}
.ai-message .message-content pre {
    background: rgba(10, 17, 40, 0.05);
    padding: 0.7em 0.9em;
    border-radius: 8px;
    overflow-x: auto;
    margin: 0.5em 0;
}
.ai-message .message-content pre code { background: none; padding: 0; }
.ai-message .message-content blockquote {
    border-left: 3px solid var(--color-secondary, #0086E3);
    margin: 0.5em 0;
    padding: 0.2em 0 0.2em 0.8em;
    opacity: 0.85;
}
.ai-message .message-content table {
    border-collapse: collapse;
    margin: 0.5em 0;
    font-size: 0.92em;
    max-width: 100%;
    display: block;
    overflow-x: auto;
}
.ai-message .message-content th,
.ai-message .message-content td {
    border: 1px solid var(--color-border, #dde3ef);
    padding: 0.35em 0.6em;
}
.ai-message .message-content a {
    color: var(--color-secondary, #0086E3);
    /* URL dài không có khoảng trắng: cho phép ngắt ở bất kỳ ký tự nào khi cần */
    overflow-wrap: anywhere;
    word-break: break-word;
}

/* Nhãn trạng thái khi đang xử lý (routing/retrieving/generating) */
.thinking-stage {
    font-size: 12.5px;
    color: var(--color-ink-soft, #5a6480);
    opacity: 0.75;
    margin-top: 4px;
}

/* Copy feedback */
.copy-btn.copied { color: #1a9e4b; }

/* ===== Polish nhẹ (mọi kích thước màn hình) ===== */
.user-message .message-content {
    box-shadow: 0 4px 12px rgba(0, 85, 170, 0.22);
}

.ai-message .message-content {
    box-shadow: var(--shadow-md);
}

.quick-reply-btn {
    box-shadow: var(--shadow-sm);
}

.quick-reply-btn:active {
    transform: scale(0.97);
}

.ai-avatar {
    box-shadow: inset 0 0 0 1px var(--color-border);
}

/* Tạm ẩn đánh giá sao trên câu trả lời (bật lại: xoá rule này) */
.rating-stars {
    display: none;
}