/* chat.css - vFinal Perfect Center */

.chat-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    position: relative;
    /* 為了定位空狀態 */
}

/* ★★★ 新增：空狀態 (Empty State) 完美置中 ★★★ */
.chat-empty-state {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-sub);
    pointer-events: none;
    /* 讓點擊穿透，不影響操作 */
}

/* 空狀態內容要把滑鼠事件加回來，不然按鈕點不到 */
.chat-empty-content {
    pointer-events: auto;
    text-align: center;
    opacity: 0.6;
    /* 整體稍微透明，融入背景 */
    transition: opacity 0.3s;
}

.chat-empty-content:hover {
    opacity: 1;
}

.empty-icon {
    font-size: 5rem;
    margin-bottom: 20px;
    color: var(--accent);
    opacity: 0.5;
}

.empty-text {
    font-size: 1.1rem;
    margin-bottom: 5px;
    font-weight: bold;
    color: var(--text-main);
}

.empty-sub {
    font-size: 0.9rem;
    margin-bottom: 25px;
}

/* 空狀態裡的按鈕 */
.empty-btn {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 10px 25px;
    border-radius: 50px;
    cursor: pointer;
    font-size: 1rem;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: 0.2s;
}

.empty-btn:hover {
    background: var(--accent);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--accent-shadow);
}

/* === 以下為原有樣式 (保持不變) === */

/* 訊息容器 */
.msg-wrapper {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    position: relative;
    max-width: 85%;
    align-self: flex-end;
    animation: popIn 0.3s;
    z-index: 10;
    /* 確保在空狀態之上 */
}

.msg-bubble {
    padding: 12px 18px;
    border-radius: 16px;
    border-bottom-right-radius: 4px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    word-break: break-all;
    line-height: 1.5;
    font-size: 1rem;
    position: relative;
    transition: 0.2s;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

.msg-bubble.link-card {
    background: var(--bg-input);
    border-color: var(--border-color);
    color: var(--accent);
    cursor: pointer;
    min-width: 200px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.msg-bubble.link-card:hover {
    filter: brightness(0.95);
    border-color: var(--accent);
}

.link-text {
    font-weight: bold;
    text-decoration: none;
    color: var(--text-main);
}

.msg-bubble.text-card {
    background: var(--accent);
    border-color: var(--accent);
    color: #ffffff;
}

.copy-btn {
    position: absolute;
    top: 50%;
    left: -35px;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: var(--text-sub);
    width: 28px;
    height: 28px;
    cursor: pointer;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: 0.2s;
}

.msg-wrapper:hover .copy-btn {
    opacity: 1;
}

.copy-btn:hover {
    background: var(--bg-hover);
    color: var(--text-main);
}

.msg-bubble.image-card {
    padding: 5px;
    background: var(--bg-input);
    border-color: var(--border-color);
    display: flex;
    justify-content: center;
}

.chat-image {
    max-width: 100%;
    max-height: 300px;
    border-radius: 12px;
    object-fit: contain;
    cursor: zoom-in;
}

.msg-bubble.file-card {
    background: var(--bg-input);
    border-color: var(--border-color);
    min-width: 220px;
    padding: 10px 14px;
}

.file-ext-badge {
    flex-shrink: 0;
    width: 38px;
    height: 38px;
    border-radius: 8px;
    background: var(--accent);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.msg-bubble.video-card {
    padding: 0;
    overflow: hidden;
    background: #000;
    border: none;
    cursor: pointer;
}

.yt-thumbnail {
    width: 100%;
    max-width: 320px;
    aspect-ratio: 16/9;
    object-fit: cover;
    opacity: 0.9;
    transition: 0.2s;
}

.msg-bubble.video-card:hover .yt-thumbnail {
    opacity: 1;
}

.play-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 3rem;
    color: rgba(255, 255, 255, 0.9);
    pointer-events: none;
}

.msg-time {
    font-size: 0.75rem;
    color: var(--text-sub);
    text-align: right;
    margin-top: 4px;
}

.msg-actions {
    position: absolute;
    top: -10px;
    right: 0;
    display: flex;
    gap: 5px;
    opacity: 0;
    transition: 0.2s;
    background: var(--bg-card);
    padding: 4px;
    border-radius: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border-color);
}

.msg-wrapper:hover .msg-actions {
    opacity: 1;
    top: -35px;
}

.msg-btn {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: var(--text-sub);
    cursor: pointer;
    font-size: 0.8rem;
    transition: 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.msg-btn:hover {
    background: var(--bg-hover);
    color: var(--text-main);
}

.msg-btn.del:hover {
    color: #ff4d4f;
    background: rgba(255, 77, 79, 0.1);
}

.chat-input-area {
    padding: 15px;
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 10px;
    align-items: center;
    border-radius: 0 0 16px 16px;
}

.chat-input {
    flex: 1;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 12px 18px;
    border-radius: 24px;
    outline: none;
    transition: 0.3s;
}

.chat-input:focus {
    border-color: var(--accent);
    background: var(--bg-card);
}

.btn-send {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    border: none;
    background: var(--accent);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: 0.2s;
    box-shadow: 0 4px 10px var(--accent-glow);
}

.btn-send:hover {
    transform: scale(1.1);
}

.btn-send:active {
    transform: scale(0.95);
}

.btn-tool.danger {
    color: var(--text-sub);
    border-color: transparent;
    background: transparent;
    transition: 0.2s;
}

.btn-tool.danger:hover {
    color: var(--accent);
    background: var(--accent-dim);
    border-color: var(--accent);
}

@keyframes popIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}