:root {
    --bg-color: #151515;
    --sidebar-bg: #0b0b0b;
    --chat-bg: #151515;
    --input-bg: #2f2f2f;
    --text-primary: #f5f5f5;
    --text-secondary: #9b9b9b;
    --accent-color: #4d6bfe;
    --accent-hover: #3d5be0;
    --msg-user-bg: #2f2f2f;
    --msg-bot-bg: transparent;
    --border-color: #2f2f2f;
    --hover-bg: #1f1f1f;
    --success-color: #00bfa5;
    --danger-color: #cf6679;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    outline: none;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    height: 100vh;
    height: 100dvh;
    display: flex;
    overflow: hidden;
    font-size: 14px;
}

/* ========== Sidebar ========== */
#sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    display: flex;
    flex-direction: column;
    padding: 16px;
    flex-shrink: 0;
    border-right: 1px solid var(--border-color);
    transition: transform 0.3s ease;
    z-index: 200;
}

#sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 199;
}

.sidebar-top-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.sidebar-close-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 18px;
    cursor: pointer;
    padding: 4px 8px;
}

.logo-area {
    font-size: 1.2rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-primary);
    padding: 0 8px;
}

.new-chat-btn {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 10px 16px;
    border-radius: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.95rem;
    margin-bottom: 20px;
    transition: all 0.2s;
    font-weight: 500;
}

.new-chat-btn:hover {
    background-color: var(--accent-hover);
}

.history-list {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.history-list::-webkit-scrollbar { width: 4px; }
.history-list::-webkit-scrollbar-thumb { background: #333; border-radius: 2px; }

.history-item {
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: background 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.history-item:hover { background-color: var(--hover-bg); color: var(--text-primary); }
.history-item.active { background-color: var(--hover-bg); color: var(--text-primary); }

.sidebar-footer {
    padding-top: 10px;
    border-top: 1px solid var(--border-color);
    margin-top: 10px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.footer-btn {
    padding: 10px 12px;
    cursor: pointer;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
    transition: color 0.2s, background 0.2s;
    background: none;
    border: none;
    font-size: 14px;
}

.footer-btn:hover { background-color: var(--hover-bg); color: var(--text-primary); }

/* ========== Mobile Header ========== */
#mobile-header {
    display: none;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    background-color: var(--sidebar-bg);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.mobile-menu-btn {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 20px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 8px;
}

.mobile-menu-btn:active { background-color: var(--hover-bg); }

.mobile-header-title {
    font-size: 1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ========== Main Content ========== */
#main-content {
    flex: 1;
    background-color: var(--chat-bg);
    display: flex;
    flex-direction: column;
    position: relative;
    height: 100vh;
    height: 100dvh;
    min-width: 0;
}

/* ========== Chat View ========== */
#chat-view {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 40px 0;
    scroll-behavior: smooth;
}

.welcome-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-primary);
    padding: 20px;
}

.welcome-title {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 40px;
    text-align: center;
}

.message {
    max-width: 800px;
    margin: 0 auto 24px auto;
    padding: 0 20px;
    display: flex;
    gap: 12px;
    line-height: 1.6;
}

.message.user { flex-direction: row-reverse; }

.avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--accent-color);
    display: flex;
    justify-content: center;
    align-items: center;
    flex-shrink: 0;
    font-size: 14px;
}

.avatar.bot { background: transparent; font-size: 24px; }
.avatar.user { background: #4a4a4a; }

.msg-content {
    background-color: var(--msg-user-bg);
    padding: 12px 16px;
    border-radius: 12px;
    max-width: 80%;
    word-break: break-word;
    font-size: 15px;
}

.message.bot .msg-content {
    background-color: transparent;
    padding: 0;
    max-width: 100%;
}

/* ========== Chat Input ========== */
.chat-input-container {
    padding: 16px 16px 12px 16px;
    background-color: var(--bg-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-shrink: 0;
}

.input-box {
    width: 100%;
    max-width: 800px;
    background-color: var(--input-bg);
    border-radius: 16px;
    padding: 12px 16px;
    border: 1px solid transparent;
    transition: border-color 0.2s;
    position: relative;
    display: flex;
    flex-direction: column;
}

.input-box:focus-within { border-color: #444; }

.input-textarea {
    width: 100%;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 16px;
    resize: none;
    max-height: 200px;
    min-height: 48px;
    line-height: 1.5;
}

.input-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 8px;
    gap: 8px;
}

.tool-toggles {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.toggle-btn {
    background: transparent;
    border: 1px solid #444;
    color: var(--text-secondary);
    padding: 4px 12px;
    border-radius: 14px;
    font-size: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
    white-space: nowrap;
}

.toggle-btn:hover { color: var(--text-primary); border-color: #666; }

.toggle-btn.active {
    background-color: rgba(77, 107, 254, 0.2);
    color: var(--accent-color);
    border-color: var(--accent-color);
}

.send-btn {
    background-color: var(--text-primary);
    color: black;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: none;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: opacity 0.2s;
    flex-shrink: 0;
}

.send-btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* 增强按钮图标可见性 */
.send-btn i, .primary-btn i, .footer-btn i, .new-chat-btn i {
    display: inline-block !important;
    visibility: visible !important;
    font-family: "Font Awesome 5 Free", "Font Awesome 5 Brands" !important;
    font-weight: 900 !important;
}

/* ========== Knowledge Base View ========== */
#kb-view, #settings-view, #wechat-view, #user-list-view, #agent-config-view {
    padding: 32px 4%;
    max-width: 96%;
    margin: 0 auto;
    width: 100%;
    height: 100%;
    overflow-y: auto;
    box-sizing: border-box;
}

#kb-view {
    max-width: 90%;
}

#wechat-view {
    max-width: 96%;
    padding: 24px 2%;
}

.kb-header-area {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 12px;
}

.kb-header-title { font-size: 1.5rem; font-weight: 600; }

.kb-actions { display: flex; gap: 10px; flex-wrap: wrap; }

.kb-search-input {
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    color: white;
    padding: 8px 12px;
    border-radius: 8px;
    width: 250px;
}

.primary-btn {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 8px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    white-space: nowrap;
}

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

.kb-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.kb-table-container {
    background-color: var(--bg-color);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    overflow-x: auto;
}

.kb-table { width: 100%; border-collapse: collapse; }
.kb-table th, .kb-table td { padding: 16px; text-align: left; border-bottom: 1px solid var(--border-color); }
.kb-table th { background-color: #1f1f1f; color: var(--text-secondary); font-weight: 500; white-space: nowrap; }
.kb-table td { color: var(--text-primary); }
.kb-table tr:hover { background-color: var(--hover-bg); }

.status-tag { display: inline-block; padding: 2px 8px; border-radius: 4px; font-size: 12px; background: #333; color: #ccc; }
.status-tag.indexing { color: #ffd700; background: rgba(255, 215, 0, 0.1); }
.status-tag.success { color: #00ff9d; background: rgba(0, 255, 157, 0.1); }
.status-tag.error { color: #ff5252; background: rgba(255, 82, 82, 0.1); }

/* ========== Modal ========== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
    padding: 16px;
}

.modal-content {
    background: #252525;
    width: 500px;
    max-width: 100%;
    padding: 24px;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    max-height: 90vh;
    overflow-y: auto;
}

.modal-title { font-size: 1.25rem; margin-bottom: 20px; font-weight: 600; }

.upload-dropzone {
    border: 2px dashed #444;
    border-radius: 12px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    margin-bottom: 20px;
    transition: all 0.2s;
}

.upload-dropzone:hover { border-color: var(--accent-color); background: rgba(77, 107, 254, 0.05); }

.file-list { max-height: 150px; overflow-y: auto; margin-bottom: 20px; }

.file-item {
    display: flex;
    justify-content: space-between;
    padding: 8px;
    background: #333;
    margin-bottom: 4px;
    border-radius: 4px;
}

.hidden { display: none !important; }


/* ========== Mobile Responsive (< 768px) ========== */
@media (max-width: 768px) {
    /* Sidebar: 默认隐藏，通过 JS 控制显示 */
    #sidebar {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: 280px;
        transform: translateX(-100%);
        z-index: 200;
    }

    #sidebar.open {
        transform: translateX(0);
    }

    #sidebar-overlay.open {
        display: block;
    }

    .sidebar-close-btn {
        display: block;
    }

    /* Mobile Header: 显示 */
    #mobile-header {
        display: flex;
    }

    /* Chat 区域适配 */
    .chat-container {
        padding: 16px 0;
    }

    .message {
        padding: 0 12px;
        gap: 8px;
        margin-bottom: 16px;
    }

    .avatar {
        width: 28px;
        height: 28px;
        font-size: 12px;
    }

    .avatar.bot {
        font-size: 20px;
    }

    .msg-content {
        padding: 10px 12px;
        font-size: 14px;
        max-width: 85%;
    }

    .welcome-title {
        font-size: 1.3rem;
        margin-bottom: 20px;
        padding: 0 20px;
    }

    /* Input 区域适配 */
    .chat-input-container {
        padding: 10px 12px 24px 12px;
    }

    .input-box {
        border-radius: 12px;
        padding: 10px 12px;
    }

    .input-textarea {
        font-size: 15px;
        min-height: 40px;
    }

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

    .tool-toggles {
        gap: 6px;
    }

    .toggle-btn {
        padding: 3px 8px;
        font-size: 11px;
        gap: 4px;
    }

    /* Knowledge Base 适配 */
    #kb-view {
        padding: 16px;
    }

    .kb-header-area {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .kb-actions {
        width: 100%;
    }

    .kb-search-input {
        flex: 1;
        width: auto;
        min-width: 0;
    }

    .kb-table th, .kb-table td {
        padding: 10px 8px;
        font-size: 13px;
    }

    /* Modal 适配 */
    .modal-content {
        width: 100%;
        padding: 20px 16px;
        border-radius: 12px;
    }

    .upload-dropzone {
        padding: 24px 16px;
    }

    /* 底部提示文字 */
    .chat-input-container > div:last-child {
        font-size: 11px;
        margin-top: 10px;
        padding-bottom: 6px;
    }
}

/* ========== Small Mobile (< 400px) ========== */
@media (max-width: 400px) {
    .welcome-title {
        font-size: 1.1rem;
    }

    .msg-content {
        max-width: 90%;
        font-size: 13px;
    }

    .toggle-btn {
        padding: 2px 6px;
        font-size: 10px;
    }

    .toggle-btn i {
        display: none;
    }
}

/* ========== Tablet (768px - 1024px) ========== */
@media (min-width: 769px) and (max-width: 1024px) {
    #sidebar {
        width: 220px;
    }

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

/* ========== Search Results Panel ========== */
.search-results-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: 380px;
    height: 100vh;
    height: 100dvh;
    background-color: #1a1a1a;
    border-left: 1px solid var(--border-color);
    transform: translateX(100%);
    transition: transform 0.3s ease;
    z-index: 150;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.search-results-panel.open {
    transform: translateX(0);
}

.search-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    font-size: 15px;
    color: var(--text-primary);
    flex-shrink: 0;
}

.search-panel-header i {
    margin-right: 8px;
    color: var(--accent-color);
}

.search-panel-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 16px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
    transition: background 0.2s;
}

.search-panel-close:hover {
    background-color: var(--hover-bg);
    color: var(--text-primary);
}

.search-results-list {
    flex: 1;
    overflow-y: auto;
    padding: 12px;
}

.search-results-list::-webkit-scrollbar { width: 4px; }
.search-results-list::-webkit-scrollbar-thumb { background: #333; border-radius: 2px; }

.search-result-item {
    display: flex;
    gap: 12px;
    padding: 14px;
    border-radius: 10px;
    margin-bottom: 8px;
    background-color: #222;
    text-decoration: none;
    color: inherit;
    transition: background 0.2s;
    cursor: pointer;
}

.search-result-item:hover {
    background-color: #2a2a2a;
}

.search-result-index {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: var(--accent-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
    flex-shrink: 0;
    margin-top: 2px;
}

.search-result-body {
    flex: 1;
    min-width: 0;
}

.search-result-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 4px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.search-result-snippet {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 6px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.5;
}

.search-result-url {
    font-size: 11px;
    color: #666;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

@media (max-width: 768px) {
    .search-results-panel {
        width: 100%;
    }
}

/* ========== Safe area for notched phones ========== */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
    .chat-input-container {
        padding-bottom: calc(24px + env(safe-area-inset-bottom));
    }
}

/* 炫彩按钮动画 */
@keyframes rainbowShift {
    0%   { background-position: 0% 50%; }
    50%  { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}