body { 
    background: #0f141c url('//://unsplash.com') no-repeat center center fixed; 
    background-size: cover;
    color: #f0f6fc; 
    font-family: system-ui, -apple-system, sans-serif; 
    margin: 0; 
    padding: 0; 
    overflow: hidden; 
    height: 100vh; 
    position: relative; 
}

/* KHÔNG GIAN LƯỚI DESKTOP CHỨA CÁC BOX MÁY CHỦ */
#desktop {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 45px;
    padding: 25px;
    overflow-y: auto;
}
.shortcut-grid { 
    display: flex; 
    flex-wrap: wrap; 
    gap: 25px; 
}

/* CARD BOX MÁY CHỦ SẠCH SẼ */
.server-box { 
    background: rgba(22, 27, 34, 0.85); 
    backdrop-filter: blur(12px);
    border: 1px solid rgba(48, 54, 61, 0.8); 
    border-radius: 12px; 
    width: 290px; 
    padding: 18px; 
    box-shadow: 0 8px 32px rgba(0,0,0,0.3); 
}
.title { font-size: 16px; font-weight: 600; color: #58a6ff; margin-bottom: 12px; display: flex; justify-content: space-between; align-items: center; }
.status-dot { width: 8px; height: 8px; background: #39d353; border-radius: 50%; display: inline-block; box-shadow: 0 0 8px #39d353; }
.metric-item { margin: 10px 0; font-size: 12px; color: #8b949e; }
.progress-bar { background: #21262d; border-radius: 4px; height: 6px; width: 100%; margin-top: 5px; overflow: hidden; }
.progress-fill { background: #238636; height: 100%; width: 0%; transition: width 0.4s ease; }
.badge { background: #21262d; border: 1px solid #30363d; padding: 2px 6px; border-radius: 4px; font-size: 11px; font-family: monospace; color: #c9d1d9; }

/* CỬA SỔ WINBOX TERMINAL NỔI */
.winbox { position: absolute; width: 640px; height: 430px; background: #000; border: 1px solid #444c56; border-radius: 8px; display: flex; flex-direction: column; box-shadow: 0 20px 50px rgba(0,0,0,0.6); z-index: 100; overflow: hidden; }
.winbox-header { background: #161b22; padding: 10px 14px; border-bottom: 1px solid #30363d; cursor: move; display: flex; justify-content: space-between; align-items: center; user-select: none; }
.winbox-title { font-size: 13px; font-weight: 600; color: #c9d1d9; font-family: monospace; }
.winbox-controls button { background: none; border: none; color: #8b949e; font-size: 14px; cursor: pointer; margin-left: 10px; }
.winbox-controls button:hover { color: #fff; }
.winbox-body { flex: 1; padding: 4px; overflow: hidden; background: #000; }

/* TASKBAR ĐẬM CHẤT WINDOWS */
#taskbar { position: fixed; bottom: 0; left: 0; right: 0; height: 45px; background: rgba(22, 27, 34, 0.95); backdrop-filter: blur(8px); border-top: 1px solid #30363d; display: flex; align-items: center; padding: 0; z-index: 9999; }
#start-btn { background: #238636; color: white; border: none; height: 100%; padding: 0 20px; font-weight: bold; font-size: 14px; cursor: pointer; transition: background 0.2s; }
#start-btn:hover { background: #2ea043; }
#task-items-container { display: flex; align-items: center; height: 100%; padding-left: 10px; gap: 6px; }
.task-item { background: #21262d; border: 1px solid #30363d; color: #c9d1d9; padding: 6px 15px; border-radius: 4px; font-size: 12px; cursor: pointer; font-family: monospace; }
.task-item:hover { background: #30363d; border-color: #8b949e; }

/* ==================== ĐỊNH DẠNG WINDOWS START MENU CAO CẤP ==================== */
#start-menu { 
    position: fixed; 
    bottom: 46px; 
    left: 0; 
    width: 320px; 
    height: 400px; 
    background: rgba(22, 27, 34, 0.98); 
    backdrop-filter: blur(20px);
    border: 1px solid #30363d; 
    border-radius: 0 8px 0 0;
    display: flex; 
    box-shadow: 5px -5px 25px rgba(0,0,0,0.5); 
    z-index: 99999; 
}
/* Cột Sidebar tính năng bên trái */
.start-sidebar { 
    width: 50px; 
    background: rgba(33, 38, 45, 0.5); 
    display: flex; 
    flex-direction: column; 
    justify-content: flex-end; 
    align-items: center; 
    padding-bottom: 15px; 
    gap: 20px;
    border-right: 1px solid rgba(48, 54, 61, 0.5);
}
.sidebar-icon { color: #8b949e; font-size: 18px; cursor: pointer; width: 100%; text-align: center; padding: 10px 0; }
.sidebar-icon:hover { color: #f0f6fc; background: rgba(255,255,255,0.05); }

/* Cột danh sách ứng dụng bên phải */
.start-main { flex: 1; display: flex; flex-direction: column; }
.start-header { padding: 15px; font-size: 12px; font-weight: 600; color: #8b949e; text-transform: uppercase; letter-spacing: 1px; border-bottom: 1px solid #21262d; }
.start-apps { flex: 1; padding: 10px; overflow-y: auto; }
.start-item { display: flex; align-items: center; padding: 10px 12px; border-radius: 6px; font-size: 13px; color: #c9d1d9; cursor: pointer; transition: background 0.2s; margin-bottom: 4px; }
.start-item:hover { background: rgba(56, 139, 253, 0.15); color: #58a6ff; }
.start-item-icon { margin-right: 12px; font-size: 16px; }