/**
 * Freelix Chat CSS
 * 現代化設計風格，與 job-board 保持一致
 */

.chat-container {
    display: flex;
    height: calc(100vh - 120px);
    min-height: 600px;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--neutral-200);
    max-width: 1400px;
    margin: 0 auto;
}

/* 左側聊天列表 */
.chat-sidebar {
    min-width: 350px;
    max-width: 350px;
    background: var(--neutral-50);
    border-right: 1px solid var(--neutral-200);
    display: flex;
    flex-direction: column;
}

.chat-search {
    padding: var(--spacing-6);
    border-bottom: 1px solid var(--neutral-200);
    position: relative;
    background: linear-gradient(135deg, var(--neutral-50) 0%, #fafafa 100%);
}

.chat-search input {
    width: 100%;
    border: 2px solid var(--neutral-300);
    border-radius: var(--radius-xl);
    font-size: var(--text-base);
    font-family: var(--font-body);
    background: linear-gradient(135deg, var(--neutral-50) 0%, #fefefe 100%);
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.chat-search input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px var(--primary-light);
    background: var(--neutral-50);
}

.chat-search input:focus + i {
    color: var(--primary-dark);
    transform: scale(1.1);
}

.chat-search i {
    position: absolute;
    left: var(--spacing-8);
    top: 50%;
    transform: translateY(-50%);
    color: var(--primary-color);
    font-size: var(--text-lg);
    transition: all 0.3s ease;
}

.chat-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-4);
}

.chat-item {
    padding: var(--spacing-4);
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-3);
    background: var(--neutral-100);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
    transform-origin: center left;
}

.chat-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(41, 121, 255, 0.1), transparent);
    transition: left 0.5s ease;
}

.chat-item:hover {
    background: linear-gradient(135deg, var(--primary-light) 0%, rgba(59, 130, 246, 0.1) 100%);
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.chat-item:hover::before {
    left: 100%;
}

.chat-item.active {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--neutral-50);
    border-color: var(--primary-dark);
    box-shadow: var(--shadow-lg);
}

.chat-item-avatar {
    width: 56px;
    height: 56px;
    overflow: hidden;
    border-radius: 50%;
    background: var(--neutral-200);
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: var(--shadow-md);
    border: 3px solid var(--neutral-50);
}

.chat-item-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.chat-item-info {
    flex: 1;
}

.chat-item-name {
    font-weight: 700;
    color: var(--neutral-900);
    margin-bottom: var(--spacing-1);
    font-size: var(--text-base);
    font-family: var(--font-heading);
}

.chat-item.active .chat-item-name {
    color: var(--neutral-50);
}

.chat-item-preview {
    font-size: var(--text-sm);
    color: var(--neutral-600);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-family: var(--font-body);
}

.chat-item.active .chat-item-preview {
    color: rgba(255, 255, 255, 0.8);
}

/* 未讀標記 */
.unread-badge {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--neutral-50);
    min-width: 24px;
    height: 24px;
    border-radius: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: var(--text-xs);
    font-weight: 700;
    padding: 0 var(--spacing-2);
    margin-left: var(--spacing-2);
    box-shadow: var(--shadow-md);
    animation: unreadPulse 2s infinite;
    position: relative;
}

.unread-badge::after {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: inherit;
    border-radius: inherit;
    opacity: 0.3;
    animation: unreadRipple 2s infinite;
}

.chat-item.active .unread-badge {
    background: var(--neutral-50);
    color: var(--primary-color);
}

/* 右側聊天窗口 */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--neutral-50);
}

.chat-header {
    padding: var(--spacing-6);
    border-bottom: 1px solid var(--neutral-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: linear-gradient(135deg, var(--neutral-50) 0%, var(--neutral-100) 100%);
}

.chat-user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.chat-user-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
    box-shadow: var(--shadow-md);
    border: 3px solid var(--neutral-50);
}

.chat-user-details h3 {
    margin: 0;
    font-size: var(--text-lg);
    color: var(--neutral-900);
    font-family: var(--font-heading);
    font-weight: 700;
}

.chat-user-status {
    font-size: var(--text-sm);
    color: var(--neutral-600);
    font-family: var(--font-body);
}

.chat-actions {
    display: flex;
    gap: var(--spacing-2);
}

.chat-action-btn {
    background: var(--neutral-100);
    border: 2px solid var(--neutral-300);
    color: var(--neutral-600);
    font-size: var(--text-lg);
    cursor: pointer;
    padding: var(--spacing-3);
    border-radius: var(--radius-lg);
    transition: all 0.3s ease;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.chat-action-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: radial-gradient(circle, var(--primary-light) 0%, transparent 70%);
    transition: all 0.3s ease;
    transform: translate(-50%, -50%);
    border-radius: 50%;
}

.chat-action-btn:hover::before {
    width: 100px;
    height: 100px;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-6);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
}

.message-wrapper {
    display: flex;
    flex-direction: column;
    margin-bottom: var(--spacing-4);
    max-width: 75%;
    animation: messageSlideIn 0.3s ease-out;
    transform-origin: center;
}

.message-wrapper.left {
    align-self: flex-start;
    animation: messageSlideInLeft 0.3s ease-out;
}

.message-wrapper.right {
    align-self: flex-end;
    animation: messageSlideInRight 0.3s ease-out;
}

.message {
    padding: var(--spacing-4) var(--spacing-5);
    border-radius: var(--radius-xl);
    position: relative;
    word-wrap: break-word;
    box-shadow: var(--shadow-md);
    border: 1px solid transparent;
    font-family: var(--font-body);
    line-height: var(--leading-body);
}

.message.sent {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--neutral-50);
    border-bottom-right-radius: var(--radius-lg);
}

.message.received {
    background: var(--neutral-50);
    color: var(--neutral-900);
    border-bottom-left-radius: var(--radius-lg);
    border-color: var(--neutral-200);
}

.message-sender {
    font-size: var(--text-xs);
    font-weight: 600;
    margin-bottom: var(--spacing-2);
    color: var(--neutral-600);
    font-family: var(--font-heading);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.message.sent .message-sender {
    color: rgba(255, 255, 255, 0.8);
}

.message-content {
    line-height: var(--leading-body);
    font-size: var(--text-base);
}

/* 消息中的連結樣式 */
.message-content a {
    color: inherit;
    text-decoration: underline;
    font-weight: 600;
    transition: all 0.2s ease;
}

.message.sent .message-content a {
    color: var(--neutral-100);
}

.message.sent .message-content a:hover {
    color: var(--neutral-50);
    text-shadow: 0 0 8px rgba(255, 255, 255, 0.5);
}

.message.received .message-content a {
    color: var(--primary-color);
}

.message.received .message-content a:hover {
    color: var(--primary-dark);
    text-shadow: 0 0 8px rgba(41, 121, 255, 0.3);
}

.message-footer {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    margin-top: var(--spacing-2);
    font-size: var(--text-xs);
    color: var(--neutral-500);
    font-family: var(--font-body);
    gap: var(--spacing-2);
}

.message.sent .message-footer {
    color: rgba(255, 255, 255, 0.7);
}

.message-time {
    font-weight: 500;
    opacity: 0.7;
    transition: opacity 0.3s ease;
}

.message:hover .message-time {
    opacity: 1;
}

.edited-mark {
    font-style: italic;
    opacity: 0.8;
}

.read-status {
    width: 16px;
    height: 16px;
}

.message.read .read-status::after {
    content: '';
    display: inline-block;
    width: 16px;
    height: 16px;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M18 6L9.1 16.5L4 12.5"></path></svg>') no-repeat center center;
}

.message.unread .read-status::after {
    content: '';
    display: inline-block;
    width: 16px;
    height: 16px;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M9 12h6"></path><circle cx="12" cy="12" r="10"></circle></svg>') no-repeat center center;
}

/* 聊天輸入區域 */
.chat-input-area {
    padding: var(--spacing-6);
    border-top: 1px solid var(--neutral-200);
    background: var(--neutral-50);
}

.chat-toolbar {
    display: flex;
    gap: var(--spacing-2);
    margin-bottom: var(--spacing-4);
}

.chat-tool-btn {
    background: var(--neutral-100);
    border: 2px solid var(--neutral-300);
    color: var(--neutral-600);
    font-size: var(--text-lg);
    cursor: pointer;
    padding: var(--spacing-3);
    border-radius: var(--radius-lg);
    transition: all 0.3s ease;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.chat-tool-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: radial-gradient(circle, var(--primary-light) 0%, transparent 70%);
    transition: all 0.3s ease;
    transform: translate(-50%, -50%);
    border-radius: 50%;
}

.chat-tool-btn:hover::before {
    width: 100px;
    height: 100px;
}

.chat-input-wrapper {
    display: flex;
    gap: var(--spacing-3);
    align-items: flex-end;
}

#chat-input {
    flex: 1;
    padding: var(--spacing-4);
    border: 2px solid var(--neutral-300);
    border-radius: var(--radius-xl);
    font-size: var(--text-base);
    font-family: var(--font-body);
    background: linear-gradient(135deg, var(--neutral-50) 0%, #fefefe 100%);
    transition: all 0.3s ease;
    resize: none;
    min-height: 50px;
    max-height: 120px;
    line-height: var(--leading-body);
}

#chat-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px var(--primary-light);
    background: var(--neutral-50);
}

#chat-input::placeholder {
    color: var(--neutral-500);
    font-style: italic;
}

.send-btn {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--neutral-50);
    border: none;
    border-radius: var(--radius-xl);
    cursor: pointer;
    font-size: var(--text-lg);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.send-btn:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, #1e40af 100%);
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.4);
}

.send-btn:active {
    transform: translateY(-1px) scale(1.02);
    transition: all 0.1s ease;
}



@keyframes statusPulse {
    0%, 100% {
        opacity: 1;
        transform: translateY(-50%) scale(1);
    }
    50% {
        opacity: 0.6;
        transform: translateY(-50%) scale(1.2);
    }
}

/* 空狀態 */
.chat-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    color: var(--neutral-600);
    padding: var(--spacing-8);
    text-align: center;
    width:100%;
}

.empty-state-content {
    max-width: 400px;
}

.chat-empty-state i {
    font-size: 64px;
    margin-bottom: var(--spacing-6);
    color: var(--primary-color);
    opacity: 0.7;
    animation: emptyStateFloat 3s ease-in-out infinite;
}

.chat-empty-state h3 {
    margin: 0 0 var(--spacing-3) 0;
    font-size: var(--text-2xl);
    font-weight: 700;
    font-family: var(--font-heading);
    color: var(--neutral-900);
}

.chat-empty-state p {
    margin: 0;
    font-size: var(--text-base);
    font-family: var(--font-body);
    color: var(--neutral-600);
    line-height: var(--leading-body);
}

/* 群組頭像 */
.group-avatar,
.default-avatar {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--neutral-600);
    font-size: 24px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--neutral-50);
}

/* 消息狀態 */
.message.pending {
    opacity: 0.7;
}

.message.pending::after,
.message.sent::after,
.message.failed::after {
    content: '';
    display: inline-block;
    width: 14px;
    height: 14px;
    position: absolute;
    bottom: 8px;
    right: 8px;
}

.message.pending::after {
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"></circle><polyline points="12 6 12 12 16 14"></polyline></svg>') no-repeat center center;
    animation: rotating 2s linear infinite;
}

.message.sent::after {
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M20 6L9 17l-5-5"></path></svg>') no-repeat center center;
}

.message.failed::after {
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="red" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><line x1="18" y1="6" x2="6" y2="18"></line><line x1="6" y1="6" x2="18" y2="18"></line></svg>') no-repeat center center;
}

@keyframes rotating {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.retry-button {
    position: absolute;
    bottom: -24px;
    right: 0;
    background: var(--danger-color, #f44336);
    color: var(--neutral-50);
    border: none;
    border-radius: var(--radius-lg);
    padding: var(--spacing-1) var(--spacing-3);
    font-size: var(--text-xs);
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-body);
    font-weight: 600;
}

.retry-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* 載入動畫 */
.loading-spinner {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-8);
    color: var(--primary-color);
}

.loading-spinner.centered {
    height: 100%;
}

.loading-spinner::after {
    content: '';
    width: 32px;
    height: 32px;
    border: 3px solid var(--neutral-300);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.error-message {
    padding: var(--spacing-6);
    text-align: center;
    color: var(--danger-color, #f44336);
    background: rgba(244, 67, 54, 0.1);
    border-radius: var(--radius-lg);
    margin: var(--spacing-4);
    font-family: var(--font-body);
    font-weight: 500;
}

.empty-list {
    padding: var(--spacing-8);
    text-align: center;
    color: var(--neutral-600);
    font-family: var(--font-body);
    font-style: italic;
}

/* 響應式設計 */
@media (max-width: 1024px) {
    .chat-container {
        max-width: 100%;
        height: calc(100vh - 80px);
    }
    
    .chat-sidebar {
    min-width: 300px;
    max-width: 300px;
    }
}

@media (max-width: 768px) {
    .chat-container {
        flex-direction: column;
        height: calc(100vh - 60px);
        border-radius: var(--radius-lg);
    }

    .chat-sidebar {
        width: 100%;
        height: 250px;
        border-right: none;
        border-bottom: 1px solid var(--neutral-200);
    }
    
    .chat-search {
        padding: var(--spacing-4);
    }
    
    .chat-list {
        padding: var(--spacing-2);
    }
    
    .chat-item {
        padding: var(--spacing-3);
        margin-bottom: var(--spacing-2);
    }
    
    .chat-item-avatar {
        width: 48px;
        height: 48px;
    }
    
    .message-wrapper {
        max-width: 85%;
    }
    
    .chat-header,
    .chat-input-area {
    padding: var(--spacing-4);
}

    .chat-messages {
        padding: var(--spacing-4);
    }
}

@media (max-width: 480px) {
    .chat-container {
        border-radius: var(--radius-md);
        margin: var(--spacing-2);
}

    .message {
        padding: var(--spacing-3) var(--spacing-4);
}

    .message-wrapper {
        max-width: 90%;
}

    .chat-toolbar {
        margin-bottom: var(--spacing-3);
}

    .chat-tool-btn {
        width: 40px;
        height: 40px;
        font-size: var(--text-base);
}

    .send-btn {
        width: 45px;
        height: 45px;
    }
}

/* 不同用戶類型的頭像樣式 */
.default-avatar,
.group-avatar,
.chat-avatar-fallback {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    color: var(--neutral-50);
    font-size: 20px;
    font-weight: 600;
}

/* 自由工作者頭像 */
.default-avatar.freelancer,
.chat-avatar-fallback.freelancer {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
}

/* 公司頭像 */
.default-avatar.company,
.chat-avatar-fallback.company {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-dark) 100%);
}

/* 雇主頭像 */
.default-avatar.employer,
.chat-avatar-fallback.employer {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--secondary-dark) 100%);
}

/* 管理員頭像 */
.default-avatar.admin,
.chat-avatar-fallback.admin {
    background: linear-gradient(135deg, var(--warning-color) 0%, #d97706 100%);
}

/* 普通用戶頭像 */
.default-avatar.user,
.chat-avatar-fallback.user {
    background: linear-gradient(135deg, var(--neutral-500) 0%, var(--neutral-600) 100%);
}

/* 群組聊天頭像 */
.group-avatar {
    background: linear-gradient(135deg, var(--success-color) 0%, #059669 100%);
}

/* 聊天頭部頭像特殊處理 */
.chat-user-info {
    position: relative;
}

.chat-user-avatar {
    transition: all 0.3s ease;
}

.chat-user-avatar.avatar-fallback {
    display: none;
}

.chat-avatar-fallback {
    position: absolute;
    left: 0;
    top: 0;
    width: 48px;
    height: 48px;
    font-size: 18px;
    border: 3px solid var(--neutral-50);
    box-shadow: var(--shadow-md);
}

/* 頭像加載動畫 */
.chat-item-avatar img,
.chat-user-avatar {
    transition: opacity 0.3s ease;
}

.chat-item-avatar img:not([src]),
.chat-user-avatar:not([src]) {
    opacity: 0;
}

/* 頭像懸停效果 */
.chat-item:hover .chat-item-avatar,
.chat-header:hover .chat-user-avatar,
.chat-header:hover .chat-avatar-fallback {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

/* 活躍狀態的頭像 */
.chat-item.active .default-avatar,
.chat-item.active .group-avatar {
    background: var(--neutral-50);
    color: var(--primary-color);
}

/* 不同大小的頭像適配 */
.chat-item-avatar .default-avatar,
.chat-item-avatar .group-avatar {
    font-size: 24px;
}

.chat-user-avatar .default-avatar,
.chat-avatar-fallback {
    font-size: 18px;
}

/* 錯誤狀態頭像 */
.default-avatar i,
.group-avatar i,
.chat-avatar-fallback i {
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 響應式調整 */
@media (max-width: 768px) {
    .chat-avatar-fallback {
        width: 40px;
        height: 40px;
        font-size: 16px;
    }
    
    .chat-item-avatar .default-avatar,
    .chat-item-avatar .group-avatar {
        font-size: 20px;
    }
}

@media (max-width: 480px) {
    .chat-avatar-fallback {
        width: 36px;
        height: 36px;
        font-size: 14px;
    }
    
    .chat-item-avatar .default-avatar,
    .chat-item-avatar .group-avatar {
        font-size: 18px;
    }
}

@keyframes messageSlideInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateX(0) scale(1);
    }
}

@keyframes messageSlideInRight {
    from {
        opacity: 0;
        transform: translateX(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateX(0) scale(1);
    }
}

/* === 聊天界面增強樣式 === */

/* 改善消息動畫效果 */
.message-wrapper {
    animation: messageSlideIn 0.3s ease-out;
    transform-origin: center;
}

.message-wrapper.left {
    animation: messageSlideInLeft 0.3s ease-out;
}

.message-wrapper.right {
    animation: messageSlideInRight 0.3s ease-out;
}

@keyframes messageSlideInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateX(0) scale(1);
    }
}

@keyframes messageSlideInRight {
    from {
        opacity: 0;
        transform: translateX(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateX(0) scale(1);
    }
}

/* 改善聊天項目懸停效果 */
.chat-item {
    transform-origin: center left;
}

.chat-item:not(.active):hover {
    background: linear-gradient(135deg, var(--primary-light) 0%, rgba(59, 130, 246, 0.1) 100%);
}

/* 改善輸入框樣式 */
#chat-input {
    transition: all 0.3s ease;
    background: linear-gradient(135deg, var(--neutral-50) 0%, #fefefe 100%);
}

#chat-input:focus {
    background: var(--neutral-50);
}

#chat-input::placeholder {
    color: var(--neutral-500);
    font-style: italic;
}

/* 改善工具欄按鈕 */
.chat-tool-btn,
.chat-action-btn {
    position: relative;
    overflow: hidden;
}

.chat-tool-btn::before,
.chat-action-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: radial-gradient(circle, var(--primary-light) 0%, transparent 70%);
    transition: all 0.3s ease;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    z-index: 0;
}

.chat-tool-btn:hover::before,
.chat-action-btn:hover::before {
    width: 100px;
    height: 100px;
}

.chat-tool-btn i,
.chat-action-btn i {
    position: relative;
    z-index: 1;
}

/* 改善發送按鈕 */
.send-btn {
    position: relative;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.send-btn:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, #1e40af 100%);
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.4);
}

.send-btn:active {
    transform: translateY(-1px) scale(1.02);
    transition: all 0.1s ease;
}

/* 改善未讀標籤 */
.unread-badge {
    animation: unreadPulse 2s infinite;
    position: relative;
}

.unread-badge::after {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: inherit;
    border-radius: inherit;
    opacity: 0.3;
    animation: unreadRipple 2s infinite;
    z-index: -1;
}

@keyframes unreadPulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

@keyframes unreadRipple {
    0% {
        transform: scale(1);
        opacity: 0.3;
    }
    100% {
        transform: scale(1.4);
        opacity: 0;
    }
}



@keyframes statusPulse {
    0%, 100% {
        opacity: 1;
        transform: translateY(-50%) scale(1);
    }
    50% {
        opacity: 0.6;
        transform: translateY(-50%) scale(1.2);
    }
}

/* 改善滾動條樣式 */
.chat-messages::-webkit-scrollbar,
.chat-list::-webkit-scrollbar {
    width: 6px;
}

.chat-messages::-webkit-scrollbar-track,
.chat-list::-webkit-scrollbar-track {
    background: var(--neutral-200);
    border-radius: 3px;
}

.chat-messages::-webkit-scrollbar-thumb,
.chat-list::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 3px;
    transition: all 0.3s ease;
}

.chat-messages::-webkit-scrollbar-thumb:hover,
.chat-list::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--accent-color));
}

/* 改善空狀態圖標動畫 */
.chat-empty-state i {
    animation: emptyStateFloat 4s ease-in-out infinite;
}

@keyframes emptyStateFloat {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    25% {
        transform: translateY(-10px) rotate(1deg);
    }
    50% {
        transform: translateY(0) rotate(0deg);
    }
    75% {
        transform: translateY(-5px) rotate(-1deg);
    }
}

/* 改善消息時間顯示 */
.message-time {
    opacity: 0.7;
    transition: opacity 0.3s ease;
}

.message:hover .message-time {
    opacity: 1;
}

/* 添加消息類型指示器 */
.message.system {
    background: linear-gradient(135deg, var(--neutral-100) 0%, var(--neutral-200) 100%);
    color: var(--neutral-700);
    text-align: center;
    font-style: italic;
    border-radius: var(--radius-full);
    padding: var(--spacing-2) var(--spacing-4);
    margin: var(--spacing-2) auto;
    max-width: 60%;
    font-size: var(--text-sm);
}

/* 改善聊天搜索框 */
.chat-search {
    background: linear-gradient(135deg, var(--neutral-50) 0%, #fafafa 100%);
}

.chat-search i {
    transition: all 0.3s ease;
}

.chat-search input:focus + i {
    color: var(--primary-dark);
    transform: scale(1.1);
}

/* 消息讀取狀態改善 */
.message.sent .read-status::after {
    transition: all 0.3s ease;
}

.message.read .read-status::after {
    color: var(--success-color);
    filter: drop-shadow(0 0 3px rgba(16, 185, 129, 0.3));
}

/* 打字中指示器 */
.typing-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-4);
    background: var(--neutral-100);
    border-radius: var(--radius-xl);
    margin: var(--spacing-2) 0;
    color: var(--neutral-600);
    font-style: italic;
    animation: typingFade 0.3s ease-in;
}

.typing-indicator .dots {
    display: flex;
    gap: 2px;
}

.typing-indicator .dots span {
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--primary-color);
    animation: typingDots 1.4s infinite;
}

.typing-indicator .dots span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-indicator .dots span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typingFade {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes typingDots {
    0%, 60%, 100% {
        opacity: 0.4;
        transform: scale(1);
    }
    30% {
        opacity: 1;
        transform: scale(1.2);
    }
}

/* ========================================
   Mobile Responsive Design (WhatsApp-like)
   ======================================== */

/* Mobile back button */
.chat-mobile-back {
    display: none;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3);
    background: transparent;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
    font-size: var(--text-lg);
    min-width: 44px;
    min-height: 44px;
    transition: all 0.3s ease;
}

.chat-mobile-back:hover {
    background: var(--primary-light);
    border-radius: var(--radius-lg);
}

.chat-mobile-back i {
    font-size: 24px;
}

/* Mobile layout - Single column, hide sidebar when chat active */
@media (max-width: 768px) {
    .chat-container {
        flex-direction: row; /* Keep row for proper transition */
        height: calc(100vh - 60px); /* Account for mobile bottom nav */
        min-height: auto;
        border-radius: 0;
        margin: 0;
        max-width: 100%;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 60px; /* Space for mobile bottom nav */
    }

    /* Sidebar takes full width by default */
    .chat-sidebar {
        width: 100%;
        min-width: 100%;
        max-width: unset;
        height: 100%;
        border-right: none;
        transition: transform 0.3s ease;
        position: relative;
        z-index: 2;
    }

    /* Chat main hidden by default on mobile */
    .chat-main {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: calc(100% - 70px); /* Account for input area */
        z-index: 3;
        transform: translateX(100%);
        transition: transform 0.3s ease;
        display: flex;
        flex-direction: column;
    }

    /* When chat is active, slide in main and hide sidebar */
    .chat-container.chat-active .chat-sidebar {
        transform: translateX(-100%);
    }

    .chat-container.chat-active .chat-main {
        transform: translateX(0);
    }

    /* Show mobile back button */
    .chat-mobile-back {
        display: flex;
    }

    /* Fixed header at top */
    .chat-header {
        position: sticky;
        top: 0;
        z-index: 10;
        padding: var(--spacing-3) var(--spacing-4);
        background: linear-gradient(135deg, var(--neutral-50) 0%, var(--neutral-100) 100%);
        border-bottom: 1px solid var(--neutral-200);
        flex-shrink: 0;
    }

    .chat-user-info {
        flex: 1;
        min-width: 0; /* Allow text truncation */
    }

    .chat-user-details h3 {
        font-size: var(--text-base);
        overflow: hidden;
        text-overflow: ellipsis;
    }

    /* Touch-optimized chat items */
    .chat-item {
        padding: var(--spacing-4);
        margin-bottom: var(--spacing-2);
        min-height: 72px; /* Ensure 44px+ tap target */
    }

    .chat-item-avatar {
        width: 50px;
        height: 50px;
        flex-shrink: 0;
    }

    /* Larger touch targets for buttons */
    .chat-action-btn,
    .chat-tool-btn {
        min-width: 44px;
        min-height: 44px;
        padding: var(--spacing-3);
    }

    .send-btn {
        min-width: 48px;
        min-height: 48px;
    }

    /* Optimize message bubbles for mobile */
    .message-wrapper {
        max-width: 80%;
    }

    .message {
        padding: var(--spacing-3) var(--spacing-4);
        font-size: var(--text-sm);
        line-height: 1.5;
    }

    /* Scrollable messages area between fixed header and fixed input */
    .chat-messages {
        flex: 1;
        overflow-y: auto;
        overflow-x: hidden;
        padding: var(--spacing-4);
        padding-bottom: var(--spacing-6);
        -webkit-overflow-scrolling: touch; /* Smooth scrolling on iOS */
    }


    #chat-input {
        min-height: 44px;
        max-height: 100px;
        font-size: 16px; /* Prevent iOS zoom on focus */
        padding: var(--spacing-3);
        line-height: 1.4;
    }

    .chat-toolbar {
        margin-bottom: var(--spacing-2);
    }

    /* Search optimization */
    .chat-search {
        padding: var(--spacing-4);
    }

    .chat-search input {
        font-size: 16px; /* Prevent iOS zoom */
        padding: var(--spacing-3) var(--spacing-3) var(--spacing-3) var(--spacing-10);
    }

    .chat-search i {
        left: var(--spacing-4);
    }
}

/* Extra small mobile devices */
@media (max-width: 480px) {
    .chat-container {
        height: 100vh;
        height: 100dvh; /* Use dynamic viewport height */
    }

    .chat-header {
        padding: var(--spacing-2) var(--spacing-3);
    }

    .chat-user-avatar {
        width: 40px;
        height: 40px;
    }

    .chat-item-avatar {
        width: 45px;
        height: 45px;
    }

    .message-wrapper {
        max-width: 85%;
    }

    .message {
        padding: var(--spacing-2) var(--spacing-3);
        font-size: 14px;
    }

    .message-sender {
        font-size: 10px;
        margin-bottom: var(--spacing-1);
    }

    .message-footer {
        font-size: 10px;
        margin-top: var(--spacing-1);
    }

    .chat-input-area {
        padding: var(--spacing-2) var(--spacing-3);
    }

    #chat-input {
        font-size: 16px;
        padding: var(--spacing-2);
        min-height: 40px;
    }

    .send-btn {
        width: 44px;
        height: 44px;
    }

    .chat-tool-btn {
        width: 40px;
        height: 40px;
        padding: var(--spacing-2);
    }

    .chat-messages {
        padding: var(--spacing-3);
        max-height: calc(100dvh - 280px);
    }

    .chat-search {
        padding: var(--spacing-3);
    }

    .chat-list {
        padding: var(--spacing-2);
    }
}

/* Landscape mobile optimization */
@media (max-width: 900px) and (orientation: landscape) {
    .chat-container {
        height: 100vh;
    }

    .chat-messages {
        height: calc(100vh - 160px);
        padding: var(--spacing-3);
    }

    .chat-header {
        padding: var(--spacing-2) var(--spacing-4);
    }

    .chat-input-area {
        padding: var(--spacing-2) var(--spacing-4);
    }

    #chat-input {
        min-height: 36px;
        max-height: 60px;
    }
}

/* Tablet optimization */
@media (min-width: 481px) and (max-width: 768px) {
    .chat-sidebar {
        width: 100%;
    }

    .message-wrapper {
        max-width: 75%;
    }
}

/* Large tablet / small laptop */
@media (min-width: 769px) and (max-width: 1024px) {
    .chat-container {
        max-width: 100%;
        margin: var(--spacing-4);
        height: calc(100vh - 100px);
    }

    .chat-sidebar {
        width: 320px;
    }

    .message-wrapper {
        max-width: 70%;
    }
}

/* File attachment styles for mobile */
.message-attachment {
    margin-top: var(--spacing-2);
    padding: var(--spacing-3);
    background: rgba(0, 0, 0, 0.1);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    min-height: 44px; /* Touch target */
}

.message.sent .message-attachment {
    background: rgba(255, 255, 255, 0.2);
}

.message-attachment-icon {
    font-size: 24px;
    color: var(--primary-color);
    min-width: 32px;
    text-align: center;
}

.message.sent .message-attachment-icon {
    color: var(--neutral-50);
}

.message-attachment-info {
    flex: 1;
    min-width: 0;
}

.message-attachment-name {
    font-weight: 600;
    font-size: var(--text-sm);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.message-attachment-size {
    font-size: var(--text-xs);
    opacity: 0.8;
    margin-top: 2px;
}

.message-attachment-download {
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: var(--text-lg);
    transition: all 0.3s ease;
}

.message.sent .message-attachment-download {
    color: var(--neutral-50);
}

/* Image attachment preview - WhatsApp style */
.message-image-attachment {
    margin-top: var(--spacing-2);
    border-radius: 8px;
    overflow: hidden;
    max-width: 280px;
    position: relative;
}

.message-image-attachment img {
    width: 100%;
    height: auto;
    display: block;
    cursor: pointer;
    transition: all 0.2s ease;
    border-radius: 8px;
}

.message-image-attachment img:hover {
    opacity: 0.95;
}

/* Hide filename text for images (WhatsApp doesn't show it) */
.message.received .message-image-attachment + .message-content,
.message.sent .message-image-attachment + .message-content {
    display: none;
}

/* Adjust message content to not show filename when there's an image */
.message-wrapper:has(.message-image-attachment) .message-content {
    display: none;
}

@media (max-width: 768px) {
    .message-image-attachment {
        max-width: 240px;
    }

    .message-attachment {
        padding: var(--spacing-2);
        gap: var(--spacing-2);
    }

    .message-attachment-icon {
        font-size: 20px;
        min-width: 28px;
    }

    .message-attachment-name {
        font-size: 12px;
    }

    .message-attachment-size {
        font-size: 10px;
    }
}

/* Upload progress indicator */
.upload-progress {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--neutral-50);
    padding: var(--spacing-4);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    min-width: 280px;
    z-index: 1000;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

.upload-progress-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-2);
}

.upload-progress-icon {
    font-size: 24px;
    color: var(--primary-color);
}

.upload-progress-text {
    flex: 1;
    font-weight: 600;
    color: var(--neutral-900);
}

.upload-progress-bar {
    height: 6px;
    background: var(--neutral-200);
    border-radius: 3px;
    overflow: hidden;
    margin-top: var(--spacing-2);
}

.upload-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-dark));
    border-radius: 3px;
    transition: width 0.3s ease;
}

@media (max-width: 768px) {
    .upload-progress {
        bottom: 70px;
        min-width: calc(100% - 40px);
        left: 20px;
        transform: none;
    }

    @keyframes slideUp {
        from {
            opacity: 0;
            transform: translateY(20px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }
}