* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-body: #f0f2f5;
    --bg-app: #ffffff;
    --border-color: #e9ecef;
    --sidebar-bg: #f8f9fa;
    --conv-hover: #f1f3f5;
    --conv-active: #e9ecef;
    --bubble-left-bg: #f8e9da;
    --bubble-right-bg: #dcf8c5;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --input-bg: #ffffff;
    --input-border: #dee2e6;
    --btn-bg: #007bff;
    --btn-hover: #0056b3;
    --mention-name: #007bff;
    --quote-bg: #f8f9fa;
    --highlight-bg: #fff3cd;
    --draft-bg: #fff8e7;
    --unread-badge-bg: #dc3545;
    --recalled-color: #adb5bd;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body.dark {
    --bg-body: #121212;
    --bg-app: #1e1e2f;
    --border-color: #2c2c3a;
    --sidebar-bg: #1a1a2a;
    --conv-hover: #2a2a3a;
    --conv-active: #2a2a3a;
    --bubble-left-bg: #2a2a3a;
    --bubble-right-bg: #0f4c3a;
    --text-primary: #e2e8f0;
    --text-secondary: #a0aec0;
    --input-bg: #2a2a3a;
    --input-border: #3a3a4a;
    --btn-bg: #3b82f6;
    --btn-hover: #2563eb;
    --mention-name: #60a5fa;
    --quote-bg: #1e2a3e;
    --highlight-bg: #7c5e10;
    --draft-bg: #4a3a1a;
    --unread-badge-bg: #c0392b;
    --recalled-color: #888;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
}

body {
    background: var(--bg-body);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 16px;
    transition: background 0.2s;
}

.app {
    width: 1300px;
    max-width: 98vw;
    height: 90vh;
    background: var(--bg-app);
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    display: flex;
    overflow: hidden;
    border: none;
}

.sidebar {
    width: 320px;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    box-shadow: 1px 0 5px rgba(0, 0, 0, 0.05);
    z-index: 1;
}

.user-info {
    padding: 20px 20px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-app);
}

.user-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
}

.user-name {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.action-buttons {
    padding: 12px 16px;
    display: flex;
    gap: 12px;
    border-bottom: 1px solid var(--border-color);
}

.light-btn,
.modal-btn {
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    padding: 6px 16px;
    border-radius: 30px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s;
}

.light-btn:hover,
.modal-btn:hover {
    background: var(--conv-hover);
}

.conv-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px 8px;
}

.conv-card {
    display: flex;
    align-items: center;
    padding: 12px 12px;
    gap: 14px;
    cursor: pointer;
    transition: all 0.2s;
    border-radius: 12px;
    margin-bottom: 4px;
    background: var(--bg-app);
    border: 1px solid #6d5959;
    box-shadow: var(--shadow-sm);
    position: relative;
}

.conv-list .conv-card:last-child {
    margin-bottom: 0;
}

.conv-card:hover {
    background: var(--conv-hover);
    transform: translateX(2px);
    box-shadow: var(--shadow-md);
}

.conv-card.active {
    background: var(--conv-active);
    border-left: 3px solid var(--btn-bg);
    border-radius: 12px 8px 8px 12px;
    box-shadow: var(--shadow-sm);
}

.conv-card.has-draft {
    background: #fff1e0 !important;
    border-left: 4px solid #f5a623 !important;
}

.conv-card.has-draft .conv-preview {
    color: #e67e22 !important;
    font-weight: 500;
}

body.dark .conv-card.has-draft {
    background: #4a3a2a !important;
}

body.dark .conv-card.has-draft .conv-preview {
    color: #f5a623 !important;
}

body.dark .conv-card {
    border-bottom-color: var(--text-secondary);
}

.conv-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
}

.conv-details {
    flex: 1;
    min-width: 0;
}

.conv-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: nowrap;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conv-name span {
    overflow: hidden;
    text-overflow: ellipsis;
}

.conv-preview {
    font-size: 0.75rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-top: 4px;
}

.conv-time {
    font-size: 0.7rem;
    color: var(--text-secondary);
    white-space: nowrap;
    text-align: right;
}

.mention-badge {
    background: var(--unread-badge-bg);
    color: white;
    border-radius: 12px;
    padding: 2px 8px;
    font-size: 0.65rem;
    flex-shrink: 0;
}

.unread-count {
    background: var(--unread-badge-bg);
    color: white;
    border-radius: 12px;
    padding: 2px 6px;
    font-size: 0.65rem;
    font-weight: bold;
    min-width: 20px;
    text-align: center;
    margin-left: 8px;
}

.mention-preview {
    color: #e74c3c;
    font-weight: 600;
    margin-right: 4px;
}

.chat-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-app);
}

.chat-header {
    padding: 18px 24px;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-app);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
    z-index: 1;
}

.back-btn {
    display: none;
    background: transparent;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-primary);
    padding: 0 8px;
}

.theme-toggle {
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    padding: 6px 12px;
    border-radius: 30px;
    cursor: pointer;
    font-size: 0.8rem;
    color: var(--text-primary);
}

.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    background: var(--bg-app);
}

.message-wrapper {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    max-width: 80%;
    position: relative;
}

.message-left {
    align-self: flex-start;
}

.message-right {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.msg-avatar-large {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
}

.bubble {
    background: var(--bubble-left-bg);
    border-radius: 18px;
    padding: 10px 14px 14px 14px;
    box-shadow: var(--shadow-sm);
    border: none;
    position: relative;
}

.message-left .bubble {
    border-top-left-radius: 4px;
}

.message-right .bubble {
    background: linear-gradient(135deg, var(--bubble-right-bg), var(--bubble-right-bg) 80%, #e0f0e0);
    border-top-right-radius: 4px;
}

.message-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
}

.msg-name {
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.msg-time {
    font-size: 0.6rem;
    color: var(--text-secondary);
}

.msg-content {
    font-size: 0.9rem;
    line-height: 1.45;
    color: var(--text-primary);
    word-break: break-word;
    white-space: pre-wrap;
}

.mention-name {
    color: var(--mention-name);
    font-weight: 600;
}

.recalled-message {
    color: var(--recalled-color);
    font-style: italic;
}

.quote-block {
    background: var(--quote-bg);
    border-left: 3px solid var(--btn-bg);
    padding: 6px 10px;
    margin-bottom: 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.quote-block:hover {
    opacity: 0.8;
}

.highlight-message {
    background-color: var(--highlight-bg);
    border-radius: 12px;
    transition: background 0.3s;
}

@keyframes blinkYellow {
    0% {
        background-color: var(--highlight-bg);
    }
    50% {
        background-color: transparent;
    }
    100% {
        background-color: var(--highlight-bg);
    }
}

.blink-highlight {
    animation: blinkYellow 0.6s ease-in-out 3;
}

.forward-message {
    cursor: pointer;
    background: var(--quote-bg);
    border-radius: 12px;
    padding: 4px 8px;
    margin-top: 4px;
    font-size: 0.75rem;
    color: var(--btn-bg);
    text-align: center;
}

.media-preview {
    max-width: 220px;
    max-height: 160px;
    border-radius: 12px;
    cursor: pointer;
    margin-top: 6px;
    border: 1px solid var(--border-color);
}

.download-link {
    font-size: 0.7rem;
    color: var(--btn-bg);
    display: inline-block;
    margin-top: 4px;
}

.file-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--input-bg);
    padding: 6px 14px;
    border-radius: 30px;
    text-decoration: none;
    color: var(--btn-bg);
    font-size: 0.8rem;
    border: 1px solid var(--border-color);
}

.input-area {
    background: var(--bg-app);
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    position: relative;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.02);
}

.quote-preview-area {
    background: var(--quote-bg);
    border-radius: 16px;
    padding: 8px 12px;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-left: 3px solid var(--btn-bg);
}

.cancel-quote {
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 20px;
    background: var(--input-bg);
}

.toolbar {
    display: flex;
    gap: 12px;
    margin-bottom: 12px;
}

.message-input {
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 24px;
    padding: 12px 16px;
    min-height: 44px;
    max-height: 100px;
    overflow-y: auto;
    color: var(--text-primary);
    outline: none;
    box-shadow: inset var(--shadow-sm);
    transition: box-shadow 0.2s;
}

.message-input:focus {
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.2), inset var(--shadow-sm);
    border-color: var(--btn-bg);
}

.send-row {
    display: flex;
    justify-content: flex-end;
    margin-top: 10px;
}

.send-btn {
    background: var(--btn-bg);
    border: none;
    padding: 8px 24px;
    border-radius: 30px;
    color: white;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}

.send-btn:hover {
    background: var(--btn-hover);
}

.pending-media {
    display: inline-block;
    background: var(--quote-bg);
    border-radius: 16px;
    padding: 2px 8px;
    margin: 0 2px;
    font-size: 0.8rem;
    color: var(--btn-bg);
    border: 1px solid var(--input-border);
}

.mention-dropdown {
    position: fixed;
    background: var(--bg-app);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    max-height: 200px;
    overflow-y: auto;
    z-index: 10000;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.mention-item,
.context-menu-item {
    padding: 8px 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-primary);
    font-size: 0.85rem;
}

.mention-item:hover,
.context-menu-item:hover {
    background: var(--conv-hover);
}

.mention-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
}

.context-menu {
    position: fixed;
    background: var(--bg-app);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    overflow: hidden;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(3px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.modal-card {
    background: var(--bg-app);
    border-radius: 24px;
    width: 480px;
    max-width: 90vw;
    padding: 24px;
    border: 1px solid var(--border-color);
    max-height: 80vh;
    overflow-y: auto;
}

.modal-card h3 {
    margin-bottom: 16px;
    color: var(--text-primary);
}

.modal-card input,
.modal-card select {
    margin-top: 12px;
    width: 100%;
    padding: 10px 14px;
    border-radius: 30px;
    border: 1px solid var(--input-border);
    background: var(--input-bg);
    color: var(--text-primary);
}

.modal-buttons {
    display: flex;
    gap: 12px;
    margin-top: 20px;
    flex-direction: column;
}

.modal-btn {
    width: 100%;
    text-align: center;
}

.modal-btn.primary {
    background: var(--btn-bg);
    color: white;
    border: none;
}

.conv-select-list {
    max-height: 300px;
    overflow-y: auto;
    margin: 16px 0;
    border-radius: 16px;
    background: var(--bg-app);
    border: 1px solid var(--border-color);
}

.conv-select-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: background 0.1s;
}

.conv-select-item:hover {
    background: var(--conv-hover);
}

.conv-select-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
}

.conv-select-info {
    flex: 1;
    min-width: 0;
}

.conv-select-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
    white-space: nowrap;
    overflow: visible;
    text-overflow: ellipsis;
}

.conv-select-type {
    font-size: 0.7rem;
    color: var(--text-secondary);
    margin-top: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conv-select-checkbox {
    width: 20px;
    height: 20px;
    cursor: pointer;
    flex-shrink: 0;
    margin-left: 8px;
}

.member-select-list {
    max-height: 260px;
    overflow-y: auto;
    margin: 16px 0;
    border-radius: 16px;
    background: var(--bg-app);
    border: 1px solid var(--border-color);
}

.member-select-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 10px 16px;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
}

.member-select-item:last-child {
    border-bottom: none;
}

.member-select-item:hover {
    background: var(--conv-hover);
}

.member-select-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
}

.member-select-name {
    flex: 1;
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.95rem;
    white-space: nowrap;
    overflow: visible;
    text-overflow: ellipsis;
}

.member-select-checkbox {
    width: 20px;
    height: 20px;
    cursor: pointer;
    flex-shrink: 0;
    margin-left: 8px;
}

.forward-list {
    max-height: 300px;
    overflow-y: auto;
    margin: 12px 0;
    border-top: 1px solid var(--border-color);
    padding-top: 8px;
}

.forward-item {
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

.forward-sender {
    font-weight: 600;
    color: var(--text-primary);
}

/* 图片/视频预览增强 - 无滚动 */
.full-media-modal {
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(5px);
    overflow: hidden;
}

.full-media-modal .modal-card {
    background: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 0;
    margin: 0;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    overflow: visible;
}

.full-media {
    display: block;
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 12px;
}

.full-media-modal .close-btn {
    position: absolute;
    top: -12px;
    right: -12px;
    width: 36px;
    height: 36px;
    background: rgba(0, 0, 0, 0.6);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
    font-weight: bold;
    cursor: pointer;
    z-index: 10;
    transition: all 0.2s;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.full-media-modal .close-btn:hover {
    background: #e74c3c;
    transform: scale(1.05);
}

.checkbox-select {
    position: absolute;
    left: -30px;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.select-mode .message-wrapper {
    margin-left: 30px;
}

.select-mode .checkbox-select {
    left: -25px;
    display: block;
}

.select-mode-toolbar {
    display: flex;
    gap: 12px;
    padding: 8px 16px;
    background: var(--input-bg);
    border-bottom: 1px solid var(--border-color);
}

::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

.conv-list::-webkit-scrollbar {
    width: 4px;
}

.conv-list::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

.auth-tab {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.auth-tab button {
    background: none;
    border: none;
    padding: 8px 0;
    font-size: 1rem;
    cursor: pointer;
    color: var(--text-secondary);
    flex: 1;
}

.auth-tab button.active {
    color: var(--btn-bg);
    border-bottom: 2px solid var(--btn-bg);
}

.auth-form {
    margin-top: 16px;
}

.auth-form input {
    width: 100%;
    margin-bottom: 16px;
}

.auth-error {
    color: #e74c3c;
    font-size: 0.8rem;
    margin-top: 8px;
    text-align: center;
}

.search-container {
    padding: 10px 16px;
    border-bottom: 1px solid var(--border-color);
}

.search-input {
    width: 100%;
    padding: 8px 12px;
    border-radius: 30px;
    border: 1px solid var(--input-border);
    background: var(--input-bg);
    color: var(--text-primary);
    outline: none;
    font-size: 0.85rem;
}

.search-input:focus {
    border-color: var(--btn-bg);
}

.conv-type-badge {
    font-size: 0.7rem;
    background: var(--quote-bg);
    border-radius: 12px;
    padding: 2px 6px;
    margin-left: 6px;
    color: var(--text-secondary);
}

.avatar-hint {
    font-size: 0.7rem;
    color: var(--text-secondary);
    margin-top: 4px;
    margin-bottom: 8px;
}

.toast {
    pointer-events: none;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    bottom: auto;
}

/* 移动端优化 */
@media (max-width: 768px) {
    body {
        padding: 0;
    }

    .app {
        width: 100vw;
        height: 100vh;
        max-width: none;
        border-radius: 0;
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        max-height: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        overflow-y: auto;
        display: flex;
    }

    .chat-area {
        display: none;
        flex: 1;
        min-height: 0;
    }

    .back-btn {
        display: inline-block !important;
    }

    .user-info {
        padding: 12px 16px;
    }

    .user-avatar {
        width: 36px;
        height: 36px;
    }

    .user-name {
        font-size: 0.9rem;
    }

    .action-buttons {
        padding: 8px 12px;
    }

    .light-btn,
    .modal-btn {
        padding: 6px 12px;
        font-size: 0.9rem;
        min-height: 36px;
    }

    .conv-card {
        padding: 8px 10px;
        gap: 8px;
    }

    .conv-avatar {
        width: 40px;
        height: 40px;
    }

    .conv-name {
        font-size: 0.85rem;
    }

    .conv-preview {
        font-size: 0.65rem;
    }

    .chat-header {
        padding: 10px 16px;
    }

    .messages-container {
        padding: 12px;
        gap: 10px;
    }

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

    .bubble {
        padding: 10px 14px 14px 14px;
        font-size: 0.85rem;
    }

    .msg-avatar-large {
        width: 28px;
        height: 28px;
    }

    .msg-content {
        font-size: 0.85rem;
    }

    .media-preview {
        max-width: 150px;
        max-height: 120px;
    }

    .input-area {
        padding: 10px;
    }

    .toolbar {
        gap: 6px;
        flex-wrap: wrap;
    }

    .message-input {
        font-size: 16px;
        padding: 8px 12px;
    }

    .send-btn {
        padding: 6px 16px;
        font-size: 0.8rem;
    }

    .modal-card {
        width: 95vw;
        padding: 16px;
    }

    .modal-card h3 {
        font-size: 1.1rem;
    }

    .conv-select-item,
    .member-select-item {
        padding: 8px 12px;
    }

    .conv-select-avatar,
    .member-select-avatar {
        width: 36px;
        height: 36px;
    }

    .checkbox-select {
        width: 20px;
        height: 20px;
        left: -24px;
    }

    .select-mode .checkbox-select {
        left: -20px;
    }

    .full-media-modal .close-btn {
        width: 28px;
        height: 28px;
        top: -6px;
        right: -6px;
        font-size: 16px;
    }
    emoji-picker {
        --num-columns: 6 !important;
        width: 90vw !important;
        max-width: 320px !important;
        font-size: 14px;
    }
    
    /* 手机端聊天区入场动画（初始可见，动画时移动） */

}

/* 桌面端模态框按钮并排 */
@media (min-width: 769px) {
    .modal-buttons {
        flex-direction: row;
    }

    .modal-btn {
        width: auto;
        flex: 1;
    }
}

/* 隐藏 emoji-picker 的搜索框 */
emoji-picker::part(search) {
    display: none;
}

/* 调整表情面板的布局和大小 */
emoji-picker {
    --num-columns: 8;
    height: 400px;
}

.wave-bar {
    transition: height 0.05s ease;
}


/* 强制登录/注册模态框按钮宽度占满 */
.auth-form .modal-btn {
    width: 100%;
    margin-top: 8px;
}

/* 完全隐藏 emoji-picker 的搜索框和头部区域 */
emoji-picker::part(search),
emoji-picker .search,
.emoji-picker__search,
.emoji-picker__header,
.emoji-picker__search-container {
    display: none !important;
}