diff --git a/src/views/Community/components/DynamicNews/layouts/MainlineTimelineView.js b/src/views/Community/components/DynamicNews/layouts/MainlineTimelineView.js
index c820fce2..0095b01f 100644
--- a/src/views/Community/components/DynamicNews/layouts/MainlineTimelineView.js
+++ b/src/views/Community/components/DynamicNews/layouts/MainlineTimelineView.js
@@ -1,5 +1,5 @@
 // src/views/Community/components/DynamicNews/layouts/MainlineTimelineView.js
-// 主线时间轴布局组件 - 按 lv2 概念分组展示事件
+// 主线时间轴布局组件 - 按 lv2 概念分组展示事件（卡片式布局）
 
 import React, {
   useState,
@@ -28,9 +28,8 @@ import {
   ChevronDownIcon,
   ChevronRightIcon,
   RepeatIcon,
-  TimeIcon,
 } from "@chakra-ui/icons";
-import { FiTrendingUp, FiClock, FiZap } from "react-icons/fi";
+import { FiTrendingUp, FiZap } from "react-icons/fi";
 import DynamicNewsEventCard from "../../EventCard/DynamicNewsEventCard";
 import { getApiBase } from "@utils/apiConfig";
 
@@ -39,8 +38,8 @@ import { getApiBase } from "@utils/apiConfig";
  *
  * 功能：
  * 1. 调用 /api/events/mainline 获取预分组数据
- * 2. 按 lv2 概念分组展示，时间轴样式
- * 3. 不使用无限滚动，一次性加载全部数据
+ * 2. 按 lv2 概念分组展示，卡片式布局 + 内部时间轴
+ * 3. 按事件数量从多到少排序
  */
 const MainlineTimelineViewComponent = forwardRef(
   (
@@ -62,14 +61,15 @@ const MainlineTimelineViewComponent = forwardRef(
     const [mainlineData, setMainlineData] = useState(null);
     const [expandedGroups, setExpandedGroups] = useState({});
 
-    // 主题颜色
-    const bgColor = useColorModeValue("white", "gray.800");
-    const headerBg = useColorModeValue("gray.50", "gray.700");
-    const headerHoverBg = useColorModeValue("gray.100", "gray.600");
-    const textColor = useColorModeValue("gray.700", "gray.200");
-    const secondaryTextColor = useColorModeValue("gray.500", "gray.400");
-    const timelineBorderColor = useColorModeValue("gray.200", "gray.600");
-    const timelineLineColor = useColorModeValue("blue.200", "blue.600");
+    // 主题颜色 - 与列表模式统一的深色风格
+    const cardBg = useColorModeValue("white", "gray.800");
+    const cardBorderColor = useColorModeValue("gray.200", "gray.600");
+    const headerBg = useColorModeValue("gray.50", "gray.750");
+    const headerHoverBg = useColorModeValue("gray.100", "gray.700");
+    const textColor = useColorModeValue("gray.800", "gray.100");
+    const secondaryTextColor = useColorModeValue("gray.600", "gray.400");
+    const timelineLineColor = useColorModeValue("blue.300", "blue.500");
+    const timelineDotBg = useColorModeValue("blue.500", "blue.400");
     const scrollbarTrackBg = useColorModeValue("#f1f1f1", "#2D3748");
     const scrollbarThumbBg = useColorModeValue("#888", "#4A5568");
     const scrollbarThumbHoverBg = useColorModeValue("#555", "#718096");
@@ -179,11 +179,19 @@ const MainlineTimelineViewComponent = forwardRef(
         });
 
         if (result.success) {
-          setMainlineData(result.data);
+          // 按事件数量从多到少排序
+          const sortedMainlines = [...(result.data.mainlines || [])].sort(
+            (a, b) => b.event_count - a.event_count
+          );
+
+          setMainlineData({
+            ...result.data,
+            mainlines: sortedMainlines,
+          });
 
           // 初始化展开状态（默认展开前5个）
           const initialExpanded = {};
-          result.data.mainlines?.slice(0, 5).forEach((mainline) => {
+          sortedMainlines.slice(0, 5).forEach((mainline) => {
             initialExpanded[mainline.lv2_id] = true;
           });
           setExpandedGroups(initialExpanded);
@@ -208,7 +216,7 @@ const MainlineTimelineViewComponent = forwardRef(
       ref,
       () => ({
         refresh: fetchMainlineData,
-        getScrollPosition: () => null, // 不使用滚动位置判断
+        getScrollPosition: () => null,
       }),
       [fetchMainlineData]
     );
@@ -295,11 +303,10 @@ const MainlineTimelineViewComponent = forwardRef(
       <Box
         display={display}
         overflowY="auto"
-        minH="600px"
-        maxH="800px"
+        h="100%"
         w="100%"
-        bg={bgColor}
-        borderRadius="md"
+        px={2}
+        py={2}
         css={{
           "&::-webkit-scrollbar": { width: "6px" },
           "&::-webkit-scrollbar-track": {
@@ -320,40 +327,36 @@ const MainlineTimelineViewComponent = forwardRef(
         <Flex
           justify="space-between"
           align="center"
-          px={4}
-          py={3}
-          borderBottomWidth="1px"
-          borderColor={timelineBorderColor}
-          position="sticky"
-          top={0}
-          bg={bgColor}
-          zIndex={10}
+          px={3}
+          py={2}
+          mb={3}
+          bg={headerBg}
+          borderRadius="lg"
+          borderWidth="1px"
+          borderColor={cardBorderColor}
         >
           <HStack spacing={4}>
             <HStack spacing={2}>
               <Icon as={FiTrendingUp} color="blue.500" />
-              <Text fontWeight="semibold" color={textColor}>
+              <Text fontWeight="semibold" color={textColor} fontSize="sm">
                 {mainline_count} 条主线
               </Text>
             </HStack>
-            <HStack spacing={2}>
-              <Icon as={FiClock} color="green.500" />
-              <Text fontSize="sm" color={secondaryTextColor}>
-                {total_events} 个事件
-              </Text>
-            </HStack>
+            <Text fontSize="sm" color={secondaryTextColor}>
+              {total_events} 个事件
+            </Text>
             {ungrouped_count > 0 && (
-              <Text fontSize="sm" color="orange.500">
+              <Text fontSize="xs" color="orange.500">
                 ({ungrouped_count} 个未归类)
               </Text>
             )}
           </HStack>
 
-          <HStack spacing={2}>
+          <HStack spacing={1}>
             <Tooltip label="全部展开">
               <IconButton
                 icon={<ChevronDownIcon />}
-                size="sm"
+                size="xs"
                 variant="ghost"
                 onClick={() => toggleAll(true)}
                 aria-label="全部展开"
@@ -362,7 +365,7 @@ const MainlineTimelineViewComponent = forwardRef(
             <Tooltip label="全部折叠">
               <IconButton
                 icon={<ChevronRightIcon />}
-                size="sm"
+                size="xs"
                 variant="ghost"
                 onClick={() => toggleAll(false)}
                 aria-label="全部折叠"
@@ -371,7 +374,7 @@ const MainlineTimelineViewComponent = forwardRef(
             <Tooltip label="刷新">
               <IconButton
                 icon={<RepeatIcon />}
-                size="sm"
+                size="xs"
                 variant="ghost"
                 onClick={fetchMainlineData}
                 aria-label="刷新"
@@ -380,151 +383,144 @@ const MainlineTimelineViewComponent = forwardRef(
           </HStack>
         </Flex>
 
-        {/* 主线列表 - 时间轴样式 */}
-        <Box position="relative" px={4} py={4}>
-          {/* 时间轴垂直线 */}
-          <Box
-            position="absolute"
-            left="28px"
-            top="0"
-            bottom="0"
-            w="2px"
-            bg={timelineLineColor}
-            opacity={0.5}
-          />
+        {/* 主线卡片列表 */}
+        <VStack spacing={3} align="stretch">
+          {mainlines.map((mainline) => {
+            const colorScheme = getColorScheme(mainline.lv2_name);
+            const isExpanded = expandedGroups[mainline.lv2_id];
 
-          <VStack spacing={4} align="stretch">
-            {mainlines.map((mainline, index) => {
-              const colorScheme = getColorScheme(mainline.lv2_name);
-              const isExpanded = expandedGroups[mainline.lv2_id];
-
-              return (
-                <Box key={mainline.lv2_id} position="relative" pl={10}>
-                  {/* 时间轴圆点 */}
-                  <Box
-                    position="absolute"
-                    left="22px"
-                    top="16px"
-                    w="14px"
-                    h="14px"
-                    borderRadius="full"
-                    bg={`${colorScheme}.500`}
-                    border="3px solid"
-                    borderColor={bgColor}
-                    boxShadow="0 0 0 2px"
-                    sx={{ boxShadowColor: `${colorScheme}.200` }}
-                    zIndex={2}
-                  />
-
-                  {/* 分组头部 */}
-                  <Flex
-                    align="center"
-                    justify="space-between"
-                    px={4}
-                    py={3}
-                    bg={headerBg}
-                    borderRadius="lg"
-                    borderWidth="1px"
-                    borderColor={timelineBorderColor}
-                    cursor="pointer"
-                    _hover={{ bg: headerHoverBg }}
-                    onClick={() => toggleGroup(mainline.lv2_id)}
-                    transition="all 0.2s"
-                    boxShadow="sm"
-                  >
-                    <HStack spacing={3}>
-                      <Icon
-                        as={isExpanded ? ChevronDownIcon : ChevronRightIcon}
-                        boxSize={5}
-                        color={textColor}
-                        transition="transform 0.2s"
-                      />
-                      <VStack align="start" spacing={0}>
-                        <HStack spacing={2}>
-                          <Text
-                            fontWeight="bold"
-                            fontSize="md"
-                            color={textColor}
-                          >
-                            {mainline.lv2_name}
-                          </Text>
-                          <Badge
-                            colorScheme={colorScheme}
-                            fontSize="xs"
-                            borderRadius="full"
-                            px={2}
-                          >
-                            {mainline.event_count} 条
-                          </Badge>
-                        </HStack>
+            return (
+              <Box
+                key={mainline.lv2_id || "ungrouped"}
+                bg={cardBg}
+                borderRadius="lg"
+                borderWidth="1px"
+                borderColor={cardBorderColor}
+                overflow="hidden"
+                boxShadow="sm"
+                _hover={{ boxShadow: "md" }}
+                transition="all 0.2s"
+              >
+                {/* 卡片头部 - 概念名称 */}
+                <Flex
+                  align="center"
+                  justify="space-between"
+                  px={4}
+                  py={3}
+                  bg={headerBg}
+                  cursor="pointer"
+                  _hover={{ bg: headerHoverBg }}
+                  onClick={() => toggleGroup(mainline.lv2_id)}
+                  transition="all 0.2s"
+                  borderBottomWidth={isExpanded ? "1px" : "0"}
+                  borderBottomColor={cardBorderColor}
+                >
+                  <HStack spacing={3}>
+                    <Icon
+                      as={isExpanded ? ChevronDownIcon : ChevronRightIcon}
+                      boxSize={5}
+                      color={textColor}
+                      transition="transform 0.2s"
+                    />
+                    <Box
+                      w="4px"
+                      h="24px"
+                      bg={`${colorScheme}.500`}
+                      borderRadius="full"
+                    />
+                    <VStack align="start" spacing={0}>
+                      <HStack spacing={2}>
+                        <Text
+                          fontWeight="bold"
+                          fontSize="md"
+                          color={textColor}
+                        >
+                          {mainline.lv2_name || "其他"}
+                        </Text>
+                        <Badge
+                          colorScheme={colorScheme}
+                          fontSize="xs"
+                          borderRadius="full"
+                          px={2}
+                        >
+                          {mainline.event_count} 条
+                        </Badge>
+                      </HStack>
+                      {mainline.lv1_name && (
                         <Text fontSize="xs" color={secondaryTextColor}>
                           {mainline.lv1_name}
                         </Text>
-                      </VStack>
-                    </HStack>
+                      )}
+                    </VStack>
+                  </HStack>
+                </Flex>
 
-                    <HStack spacing={2}>
-                      <Icon
-                        as={TimeIcon}
-                        color={secondaryTextColor}
-                        boxSize={3}
-                      />
-                      <Text fontSize="xs" color={secondaryTextColor}>
-                        #{index + 1}
-                      </Text>
-                    </HStack>
-                  </Flex>
-
-                  {/* 分组内容 */}
-                  <Collapse in={isExpanded} animateOpacity>
+                {/* 卡片内容 - 时间轴事件列表 */}
+                <Collapse in={isExpanded} animateOpacity>
+                  <Box px={4} py={3} position="relative">
+                    {/* 时间轴线 */}
                     <Box
-                      mt={3}
-                      pl={2}
-                      borderLeftWidth="2px"
-                      borderLeftColor={`${colorScheme}.200`}
-                      borderLeftStyle="dashed"
-                    >
-                      <Grid
-                        templateColumns={`repeat(${columnsPerRow}, 1fr)`}
-                        gap={3}
-                        w="100%"
-                      >
-                        {mainline.events.map((event, eventIndex) => (
-                          <Box key={event.id} w="100%" minW={0}>
-                            <DynamicNewsEventCard
-                              event={event}
-                              index={eventIndex}
-                              isFollowing={
-                                eventFollowStatus[event.id]?.isFollowing ||
-                                false
-                              }
-                              followerCount={
-                                eventFollowStatus[event.id]?.followerCount ||
-                                event.follower_count ||
-                                0
-                              }
-                              isSelected={selectedEvent?.id === event.id}
-                              onEventClick={(clickedEvent) => {
-                                onEventSelect?.(clickedEvent);
-                              }}
-                              onTitleClick={(e) => {
-                                e.preventDefault();
-                                e.stopPropagation();
-                                onEventSelect?.(event);
-                              }}
-                              onToggleFollow={() => onToggleFollow?.(event.id)}
-                              borderColor={borderColor}
-                            />
-                          </Box>
-                        ))}
-                      </Grid>
-                    </Box>
-                  </Collapse>
-                </Box>
-              );
-            })}
-          </VStack>
-        </Box>
+                      position="absolute"
+                      left="24px"
+                      top="12px"
+                      bottom="12px"
+                      w="2px"
+                      bg={timelineLineColor}
+                      opacity={0.4}
+                      borderRadius="full"
+                    />
+
+                    {/* 事件列表 */}
+                    <VStack spacing={3} align="stretch" pl={8}>
+                      {mainline.events.map((event, eventIndex) => (
+                        <Box key={event.id} position="relative">
+                          {/* 时间轴圆点 */}
+                          <Box
+                            position="absolute"
+                            left="-26px"
+                            top="50%"
+                            transform="translateY(-50%)"
+                            w="10px"
+                            h="10px"
+                            borderRadius="full"
+                            bg={timelineDotBg}
+                            border="2px solid"
+                            borderColor={cardBg}
+                            zIndex={1}
+                          />
+                          {/* 事件卡片 */}
+                          <DynamicNewsEventCard
+                            event={event}
+                            index={eventIndex}
+                            isFollowing={
+                              eventFollowStatus[event.id]?.isFollowing || false
+                            }
+                            followerCount={
+                              eventFollowStatus[event.id]?.followerCount ||
+                              event.follower_count ||
+                              0
+                            }
+                            isSelected={selectedEvent?.id === event.id}
+                            onEventClick={(clickedEvent) => {
+                              onEventSelect?.(clickedEvent);
+                            }}
+                            onTitleClick={(e) => {
+                              e.preventDefault();
+                              e.stopPropagation();
+                              onEventSelect?.(event);
+                            }}
+                            onToggleFollow={() => onToggleFollow?.(event.id)}
+                            borderColor={borderColor}
+                          />
+                        </Box>
+                      ))}
+                    </VStack>
+                  </Box>
+                </Collapse>
+              </Box>
+            );
+          })}
+        </VStack>
       </Box>
     );
   }