/* @🍮 */
/* --- 全局与主题样式 --- */
        :root {
            --bg-color: #fce4ec;
            --primary-color: #ff80ab;
            --secondary-color: #f48fb1;
            --accent-color: #90caf9;
            --text-color: #444;
            --white-color: #fff;
            --border-radius: 18px;
            --phone-corner-radius: 0px;
            --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            --top-pinned-bg: #fff0f5;
            --online-status-color: #4CAF50;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html, body {
            /* @🍮 锁定屏幕，禁止左右乱滑 */
            overflow-x: hidden;
            width: 100%;
        }

        body {
            font-family: var(--font-family);
            margin: 0;
            padding: 0;
            background: linear-gradient(135deg, #fce4ec, #f8bbd0);
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 100vh;
        }

        .phone-screen {
            width: 100%;
            max-width: 420px;
            height: 100vh;
            max-height: 850px;
            background-color: var(--white-color);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            border-radius: var(--phone-corner-radius);
            overflow: hidden;
            position: relative;
            display: flex;
            flex-direction: column;
        }

        .screen {
            display: none;
            flex-direction: column;
            width: 100%;
            height: 100%;
            animation: fadeIn 0.5s ease;
        }

        .screen.active {
            display: flex;
        }

        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: scale(0.95);
            }
            to {
                opacity: 1;
                transform: scale(1);
            }
        }

        .app-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 10px 20px;
            background-color: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid #eee;
            flex-shrink: 0;
            position: relative;
            z-index: 10;
        }

        .app-header .back-btn,
        .app-header .action-btn {
            background: none;
            border: none;
            font-size: 24px;
            font-weight: bold;
            color: var(--primary-color);
            cursor: pointer;
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        #cancel-multi-select-btn {
            font-size: 14px !important;
            font-weight: 500 !important;
            color: var(--white-color) !important;
            background-color: var(--primary-color) !important;
            border-radius: 10px !important;
            padding: 5px 10px !important;
            width: auto !important;
            height: auto !important;
        }

        .app-header .action-btn-group {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .app-header .action-btn-group .action-btn {
            font-size: 16px;
            font-weight: 600;
            width: auto;
            padding: 6px 12px;
            border-radius: 10px;
        }

        .app-header .action-btn-group #create-group-btn {
            background-color: var(--primary-color);
            color: var(--white-color);
        }

        .app-header .action-btn-group #add-chat-btn {
            font-size: 28px;
            padding: 0;
            width: 40px;
            height: 40px;
            background-color: transparent;
            color: var(--primary-color);
            border-radius: 50%;
        }

        .app-header .action-btn img {
            width: 28px;
            height: 28px;
        }

        .app-header .title-container {
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
        }

        .app-header .title {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-color);
            margin: 0;
        }

        .app-header .subtitle {
            font-size: 12px;
            color: #888;
            display: flex;
            align-items: center;
            margin-top: 2px;
        }

        .online-indicator {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background-color: var(--online-status-color);
            margin-right: 5px;
        }

        .app-header .placeholder {
            width: 40px;
        }