.chat-shell {
    min-height: calc(100vh - 150px);
    display: grid;
    grid-template-rows: auto minmax(0, 1fr) auto auto;
    gap: 12px;
    color: var(--text-primary);
}

.chat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 16px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.chat-header h2 {
    margin: 0;
    font-size: 18px;
    font-weight: 700;
    color: var(--neon-cyan);
}

.chat-header span {
    display: block;
    margin-top: 2px;
    color: var(--text-secondary);
    font-size: 12px;
}

.chat-token {
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: min(520px, 50vw);
}

.chat-token input {
    min-width: 0;
    flex: 1;
    height: 36px;
    padding: 0 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: rgba(0, 0, 0, 0.28);
    color: var(--text-primary);
}

.chat-token button,
.send-btn,
.attachment-clear {
    height: 36px;
    padding: 0 14px;
    border: 1px solid var(--neon-green);
    border-radius: 6px;
    background: rgba(0, 255, 157, 0.12);
    color: var(--neon-green);
    font-weight: 700;
    cursor: pointer;
}

.chat-token button:disabled,
.send-btn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.messages {
    min-height: 320px;
    overflow-y: auto;
    padding: 18px;
    background: rgba(6, 9, 19, 0.72);
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.msg {
    display: flex;
    margin-bottom: 14px;
    min-width: 0;
}

.msg.user {
    justify-content: flex-end;
}

.bubble {
    max-width: min(760px, 82%);
    min-width: 0;
    padding: 12px 14px;
    border: 1px solid rgba(0, 217, 255, 0.18);
    border-radius: 8px;
    background: rgba(18, 22, 31, 0.92);
    color: var(--text-primary);
    overflow-wrap: anywhere;
    word-break: break-word;
    line-height: 1.55;
    overflow-x: hidden;
}

.msg.user .bubble {
    border-color: rgba(0, 255, 157, 0.26);
    background: rgba(0, 255, 157, 0.13);
}

.bubble.typing {
    border-color: rgba(0, 217, 255, 0.36);
}

.bubble.streaming,
.bubble.plain {
    white-space: pre-wrap;
}

.streaming-text,
.plain-text,
.markdown-content {
    max-width: 100%;
    overflow-wrap: anywhere;
    word-break: break-word;
}

.markdown-content {
    white-space: normal;
}

.markdown-content > :first-child {
    margin-top: 0;
}

.markdown-content > :last-child {
    margin-bottom: 0;
}

.markdown-content p {
    margin: 0 0 0.85rem;
}

.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4 {
    margin: 1.05rem 0 0.55rem;
    line-height: 1.25;
    color: var(--text-primary);
    letter-spacing: 0;
}

.markdown-content h1 {
    font-size: 1.22rem;
}

.markdown-content h2 {
    font-size: 1.12rem;
}

.markdown-content h3,
.markdown-content h4 {
    font-size: 1rem;
}

.markdown-content ul,
.markdown-content ol {
    margin: 0.35rem 0 0.9rem 1.35rem;
    padding: 0;
}

.markdown-content li {
    margin: 0.22rem 0;
    padding-left: 0.15rem;
}

.markdown-content li > p {
    margin: 0.25rem 0;
}

.markdown-content a {
    color: var(--neon-cyan);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.markdown-content blockquote {
    margin: 0.8rem 0;
    padding: 0.1rem 0 0.1rem 0.9rem;
    border-left: 3px solid rgba(0, 217, 255, 0.38);
    color: var(--text-secondary);
}

.markdown-content pre {
    max-width: 100%;
    margin: 0.75rem 0 0.95rem;
    padding: 0.85rem;
    overflow-x: auto;
    border: 1px solid rgba(0, 217, 255, 0.18);
    border-radius: 8px;
    background: rgba(0, 0, 0, 0.36);
    white-space: pre;
}

.markdown-content code {
    padding: 0.12rem 0.28rem;
    border-radius: 4px;
    background: rgba(0, 0, 0, 0.30);
    color: var(--text-primary);
    font-size: 0.92em;
}

.markdown-content pre code {
    padding: 0;
    background: transparent;
    white-space: pre;
    overflow-wrap: normal;
    word-break: normal;
}

.markdown-content table {
    display: block;
    width: 100%;
    max-width: 100%;
    margin: 0.75rem 0 0.95rem;
    overflow-x: auto;
    border-collapse: collapse;
}

.markdown-content th,
.markdown-content td {
    padding: 0.45rem 0.55rem;
    border: 1px solid rgba(0, 217, 255, 0.18);
    vertical-align: top;
}

.markdown-content th {
    background: rgba(0, 217, 255, 0.08);
    font-weight: 700;
}

.chat-status,
.attachment-list {
    display: flex;
    align-items: center;
    gap: 8px;
    min-height: 36px;
    padding: 8px 10px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: rgba(16, 20, 32, 0.72);
    color: var(--text-secondary);
}

.attachment-list {
    flex-wrap: wrap;
}

.attachment-chip {
    display: inline-flex;
    align-items: center;
    max-width: 260px;
    height: 28px;
    padding: 0 10px;
    border: 1px solid rgba(0, 217, 255, 0.22);
    border-radius: 6px;
    background: rgba(0, 217, 255, 0.08);
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.attachment-clear {
    height: 28px;
    border-color: var(--text-secondary);
    background: transparent;
    color: var(--text-secondary);
}

.composer {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 10px;
    padding: 12px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.composer textarea {
    width: 100%;
    min-height: 76px;
    resize: vertical;
    padding: 11px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: rgba(0, 0, 0, 0.3);
    color: var(--text-primary);
}

.composer-actions {
    display: flex;
    align-items: stretch;
    gap: 8px;
}

.file-button {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 36px;
    min-width: 82px;
    padding: 0 12px;
    border: 1px solid var(--neon-cyan);
    border-radius: 6px;
    color: var(--neon-cyan);
    background: rgba(0, 217, 255, 0.10);
    font-weight: 700;
    cursor: pointer;
}

.file-button input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.video-preview iframe {
    width: 100%;
    height: 240px;
    border: 0;
    border-radius: 8px;
    margin-top: 8px;
}

.image-preview {
    max-width: 100%;
    border-radius: 8px;
    margin-top: 8px;
}

.link-preview {
    margin-top: 8px;
    padding: 10px;
    border: 1px solid rgba(0, 217, 255, 0.18);
    border-radius: 8px;
    background: rgba(18, 22, 31, 0.92);
}

.tool-trace {
    max-width: min(760px, 82%);
    margin: -8px 0 14px;
    padding: 8px 10px;
    border: 1px solid rgba(0, 217, 255, 0.18);
    border-radius: 8px;
    background: rgba(0, 0, 0, 0.20);
    color: var(--text-secondary);
    font-size: 12px;
}

.tool-trace summary {
    cursor: pointer;
    color: var(--neon-cyan);
}

.tool-trace dl {
    display: grid;
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 4px 10px;
    margin: 8px 0 0;
}

.tool-trace dt {
    color: var(--text-secondary);
}

.tool-trace dd {
    min-width: 0;
    margin: 0;
    color: var(--text-primary);
    overflow-wrap: anywhere;
}

@media (max-width: 760px) {
    .chat-shell {
        min-height: calc(100vh - 120px);
    }

    .chat-header,
    .chat-token,
    .composer,
    .composer-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .chat-header,
    .composer {
        display: flex;
    }

    .chat-token {
        min-width: 0;
        width: 100%;
    }

    .bubble {
        max-width: 94%;
    }

    .tool-trace {
        max-width: 94%;
    }
}