feat: добавил ограничение записи на лекции

backend/UniVerse.Api.Tests/Helpers/ApiWebApplicationFactory.cs

@@ -161,7 +161,19 @@ public class ApiWebApplicationFactory : WebApplicationFactory<Program>
 
         stub.GetByIdAsync(Arg.Any<int>()).Returns(userDto);
         stub.UpdateProfileAsync(Arg.Any<int>(), Arg.Any<UpdateUserRequest>()).Returns(userDto);
-        stub.GetStatsAsync(Arg.Any<int>()).Returns(new UserStatsDto(0, 0, 0, 0, 0, 1, 0, 0, 100));
+        stub.GetStatsAsync(Arg.Any<int>()).Returns(new UserStatsDto(
+            0,
+            0,
+            0,
+            0,
+            0,
+            1,
+            0,
+            0,
+            100,
+            0,
+            3,
+            [new EnrollmentSlotRuleDto(1, 3), new EnrollmentSlotRuleDto(3, 5), new EnrollmentSlotRuleDto(4, 7)]));
         stub.GetEnrollmentsAsync(Arg.Any<int>(), Arg.Any<PaginationRequest>()).Returns(pagedLectures);
         stub.GetAllAsync(Arg.Any<UserFilterRequest>()).Returns(pagedUsers);
         stub.SetRolesAsync(Arg.Any<int>(), Arg.Any<IReadOnlyCollection<UserRole>>()).Returns(Task.CompletedTask);

backend/UniVerse.Api.Tests/Lectures/LectureServiceTests.cs

@@ -4,6 +4,7 @@ using UniVerse.Application.DTOs.Lectures;
 using UniVerse.Application.DTOs.Notifications;
 using UniVerse.Application.Interfaces;
 using UniVerse.Domain.Entities;
+using UniVerse.Domain.Exceptions;
 using UniVerse.Infrastructure.Data;
 using UniVerse.Infrastructure.Services;
 using Xunit;
@@ -92,6 +93,79 @@ public class LectureServiceTests
             Arg.Any<CancellationToken>());
     }
 
+    [Theory]
+    [InlineData(1, 3)]
+    [InlineData(2, 3)]
+    [InlineData(3, 5)]
+    [InlineData(4, 7)]
+    [InlineData(5, 7)]
+    public async Task EnrollAsync_ThrowsWhenActiveEnrollmentLimitReached(int level, int activeEnrollments)
+    {
+        await using var db = CreateDbContext();
+        var gamification = Substitute.For<IGamificationService>();
+        gamification.CalculateLevelAsync(Arg.Any<int>()).Returns(level);
+        var service = new LectureService(db, gamification, Substitute.For<INotificationScheduler>());
+        var startsAt = DateTime.UtcNow.AddDays(1);
+
+        db.Users.Add(new User { Id = 1, Email = "student@test.local" });
+        db.Courses.Add(new Course { Id = 1, Name = "Course" });
+        db.Lectures.Add(Lecture(100, startsAt.AddDays(100)));
+        for (var i = 1; i <= activeEnrollments; i++)
+        {
+            db.Lectures.Add(Lecture(i, startsAt.AddDays(i)));
+            db.LectureEnrollments.Add(new LectureEnrollment { LectureId = i, UserId = 1 });
+        }
+        await db.SaveChangesAsync();
+
+        await Assert.ThrowsAsync<ConflictException>(() => service.EnrollAsync(100, 1));
+    }
+
+    [Fact]
+    public async Task EnrollAsync_ThrowsWhenPastUnattendedEnrollmentsReachLimit()
+    {
+        await using var db = CreateDbContext();
+        var gamification = Substitute.For<IGamificationService>();
+        gamification.CalculateLevelAsync(Arg.Any<int>()).Returns(1);
+        var service = new LectureService(db, gamification, Substitute.For<INotificationScheduler>());
+        var now = DateTime.UtcNow;
+
+        db.Users.Add(new User { Id = 1, Email = "student@test.local" });
+        db.Courses.Add(new Course { Id = 1, Name = "Course" });
+        db.Lectures.Add(Lecture(100, now.AddDays(1)));
+        for (var i = 1; i <= 3; i++)
+        {
+            db.Lectures.Add(Lecture(i, now.AddDays(-i)));
+            db.LectureEnrollments.Add(new LectureEnrollment { LectureId = i, UserId = 1 });
+        }
+        await db.SaveChangesAsync();
+
+        await Assert.ThrowsAsync<ConflictException>(() => service.EnrollAsync(100, 1));
+    }
+
+    [Fact]
+    public async Task EnrollAsync_DoesNotCountAttendedEnrollmentsTowardLimit()
+    {
+        await using var db = CreateDbContext();
+        var gamification = Substitute.For<IGamificationService>();
+        gamification.CalculateLevelAsync(Arg.Any<int>()).Returns(1);
+        var service = new LectureService(db, gamification, Substitute.For<INotificationScheduler>());
+        var now = DateTime.UtcNow;
+
+        db.Users.Add(new User { Id = 1, Email = "student@test.local" });
+        db.Courses.Add(new Course { Id = 1, Name = "Course" });
+        db.Lectures.Add(Lecture(100, now.AddDays(1)));
+        for (var i = 1; i <= 3; i++)
+        {
+            db.Lectures.Add(Lecture(i, now.AddDays(-i)));
+            db.LectureEnrollments.Add(new LectureEnrollment { LectureId = i, UserId = 1, Attended = true });
+        }
+        await db.SaveChangesAsync();
+
+        await service.EnrollAsync(100, 1);
+
+        Assert.True(await db.LectureEnrollments.AnyAsync(e => e.LectureId == 100 && e.UserId == 1));
+    }
+
     [Fact]
     public async Task UnenrollAsync_CancelsLectureReminders()
     {

backend/UniVerse.Api.Tests/Users/UserServiceTests.cs

@@ -44,6 +44,33 @@ public class UserServiceTests
         Assert.Null(stats.NextLevelXp);
     }
 
+    [Fact]
+    public async Task GetStatsAsync_ReturnsEnrollmentSlotStateAndRules()
+    {
+        await using var db = CreateDbContext();
+        SeedLevelThresholds(db);
+        var now = DateTime.UtcNow;
+        db.Users.Add(new User { Id = 1, Email = "student@test.local", Xp = 350 });
+        db.Courses.Add(new Course { Id = 1, Name = "Course" });
+        db.Lectures.AddRange(
+            Lecture(1, now.AddDays(1)),
+            Lecture(2, now.AddDays(2)),
+            Lecture(3, now.AddDays(-1)));
+        db.LectureEnrollments.AddRange(
+            new LectureEnrollment { LectureId = 1, UserId = 1 },
+            new LectureEnrollment { LectureId = 2, UserId = 1 },
+            new LectureEnrollment { LectureId = 3, UserId = 1 });
+        await db.SaveChangesAsync();
+        var service = CreateService(db);
+
+        var stats = await service.GetStatsAsync(1);
+
+        Assert.Equal(3, stats.ActiveEnrollments);
+        Assert.Equal(5, stats.EnrollmentSlotLimit);
+        Assert.Equal(new[] { 1, 3, 4 }, stats.EnrollmentSlotRules.Select(rule => rule.Level));
+        Assert.Equal(new[] { 3, 5, 7 }, stats.EnrollmentSlotRules.Select(rule => rule.Slots));
+    }
+
     private static AppDbContext CreateDbContext()
     {
         var options = new DbContextOptionsBuilder<AppDbContext>()
@@ -77,4 +104,15 @@ public class UserServiceTests
             new LevelThreshold { Level = 3, RequiredXp = 300 });
         db.SaveChanges();
     }
+
+    private static Lecture Lecture(int id, DateTime startsAt) => new()
+    {
+        Id = id,
+        CourseId = 1,
+        Title = $"Lecture {id}",
+        StartsAt = startsAt,
+        EndsAt = startsAt.AddHours(2),
+        IsOpen = true,
+        MaxEnrollments = 30
+    };
 }

backend/UniVerse.Api/openapi.json

@@ -5135,6 +5135,20 @@
         },
         "additionalProperties": false
       },
+      "EnrollmentSlotRuleDto": {
+        "type": "object",
+        "properties": {
+          "level": {
+            "type": "integer",
+            "format": "int32"
+          },
+          "slots": {
+            "type": "integer",
+            "format": "int32"
+          }
+        },
+        "additionalProperties": false
+      },
       "LectureDetailDto": {
         "type": "object",
         "properties": {
@@ -6104,6 +6118,21 @@
             "type": "integer",
             "format": "int32",
             "nullable": true
+          },
+          "activeEnrollments": {
+            "type": "integer",
+            "format": "int32"
+          },
+          "enrollmentSlotLimit": {
+            "type": "integer",
+            "format": "int32"
+          },
+          "enrollmentSlotRules": {
+            "type": "array",
+            "items": {
+              "$ref": "#/components/schemas/EnrollmentSlotRuleDto"
+            },
+            "nullable": true
           }
         },
         "additionalProperties": false

backend/UniVerse.Application/DTOs/Users/UserDtos.cs

@@ -35,9 +35,14 @@ public record UserStatsDto(
     int Level,
     int AchievementsCount,
     int CurrentLevelXp,
-    int? NextLevelXp
+    int? NextLevelXp,
+    int ActiveEnrollments,
+    int EnrollmentSlotLimit,
+    IReadOnlyList<EnrollmentSlotRuleDto> EnrollmentSlotRules
 );
 
+public record EnrollmentSlotRuleDto(int Level, int Slots);
+
 public record UpdateUserRequest(
     string? DisplayName,
     string? AvatarUrl

backend/UniVerse.Domain/Services/EnrollmentSlotPolicy.cs

@@ -0,0 +1,21 @@
+namespace UniVerse.Domain.Services;
+
+public static class EnrollmentSlotPolicy
+{
+    private static readonly IReadOnlyList<EnrollmentSlotRule> SlotRules =
+    [
+        new(1, 3),
+        new(3, 5),
+        new(4, 7)
+    ];
+
+    public static IReadOnlyList<EnrollmentSlotRule> Rules => SlotRules;
+
+    public static int GetLimitForLevel(int level) =>
+        SlotRules
+            .Where(rule => rule.Level <= level)
+            .OrderBy(rule => rule.Level)
+            .LastOrDefault()?.Slots ?? SlotRules[0].Slots;
+}
+
+public sealed record EnrollmentSlotRule(int Level, int Slots);

backend/UniVerse.Infrastructure/Services/LectureService.cs

@@ -6,6 +6,7 @@ using UniVerse.Application.Interfaces;
 using UniVerse.Application.Mappings;
 using UniVerse.Domain.Entities;
 using UniVerse.Domain.Exceptions;
+using UniVerse.Domain.Services;
 using UniVerse.Infrastructure.Data;
 
 namespace UniVerse.Infrastructure.Services;
@@ -124,6 +125,15 @@ public class LectureService : ILectureService
             throw new ConflictException("Lecture is full.");
         if (lecture.Enrollments.Any(e => e.UserId == userId))
             throw new ConflictException("Already enrolled.");
+
+        var level = await _gamification.CalculateLevelAsync(user.Xp);
+        var enrollmentLimit = EnrollmentSlotPolicy.GetLimitForLevel(level);
+        var activeEnrollments = await _db.LectureEnrollments
+            .CountAsync(e => e.UserId == userId && !e.Attended);
+
+        if (activeEnrollments >= enrollmentLimit)
+            throw new ConflictException("Enrollment limit reached for your level.");
+
         _db.LectureEnrollments.Add(new LectureEnrollment { LectureId = lectureId, UserId = userId });
         await _db.SaveChangesAsync();
         await ScheduleLectureRemindersAsync(lecture, user);

backend/UniVerse.Infrastructure/Services/UserService.cs

@@ -6,6 +6,7 @@ using UniVerse.Application.Interfaces;
 using UniVerse.Application.Mappings;
 using UniVerse.Domain.Enums;
 using UniVerse.Domain.Exceptions;
+using UniVerse.Domain.Services;
 using UniVerse.Infrastructure.Data;
 
 namespace UniVerse.Infrastructure.Services;
@@ -55,14 +56,21 @@ public class UserService : IUserService
         var attended = await _db.LectureEnrollments.CountAsync(e => e.UserId == id && e.Attended);
         var reviews = await _db.Reviews.CountAsync(r => r.UserId == id);
         var achievements = await _db.UserAchievements.CountAsync(ua => ua.UserId == id);
+        var activeEnrollments = await _db.LectureEnrollments
+            .CountAsync(e => e.UserId == id && !e.Attended);
 
         var level = await _gamification.CalculateLevelAsync(user.Xp);
         var levelProgress = await _gamification.GetLevelProgressAsync(user.Xp);
+        var slotLimit = EnrollmentSlotPolicy.GetLimitForLevel(level);
+        var slotRules = EnrollmentSlotPolicy.Rules
+            .Select(rule => new EnrollmentSlotRuleDto(rule.Level, rule.Slots))
+            .ToList();
 
         return new UserStatsDto(
             totalLectures, attended, reviews,
             user.Xp, user.Coins, level, achievements,
-            levelProgress.CurrentLevelXp, levelProgress.NextLevelXp
+            levelProgress.CurrentLevelXp, levelProgress.NextLevelXp,
+            activeEnrollments, slotLimit, slotRules
         );
     }
 

frontend/src/api/client.ts

@@ -68,6 +68,8 @@ export async function apiRequest<T>(
     const message =
       typeof body === 'object' && body && 'message' in body
         ? String((body as { message: unknown }).message)
+        : typeof body === 'object' && body && 'detail' in body
+          ? String((body as { detail: unknown }).detail)
         : `API request failed with status ${response.status}`
     throw new ApiError(message, response.status, body)
   }

frontend/src/api/mappers.ts

@@ -50,6 +50,9 @@ export function mapApiUser(user: UserAuthDto | UserDto | CurrentUserDto, stats?:
     lecturesAttended: stats?.attendedLectures ?? 0,
     hoursLearned: stats ? Math.round(stats.attendedLectures * 1.5 * 10) / 10 : 0,
     achievements: stats ? Array.from({ length: stats.achievementsCount }, (_, index) => String(index + 1)) : [],
+    activeEnrollments: stats?.activeEnrollments,
+    enrollmentSlotLimit: stats?.enrollmentSlotLimit,
+    enrollmentSlotRules: stats?.enrollmentSlotRules,
   }
 }
 

frontend/src/api/types.ts

@@ -70,6 +70,14 @@ export interface UserStatsDto {
   achievementsCount: number
   currentLevelXp: number
   nextLevelXp?: number | null
+  activeEnrollments: number
+  enrollmentSlotLimit: number
+  enrollmentSlotRules: EnrollmentSlotRuleDto[]
+}
+
+export interface EnrollmentSlotRuleDto {
+  level: number
+  slots: number
 }
 
 export interface LectureDto {

frontend/src/components/layout/AppTopbar.vue

@@ -17,6 +17,11 @@ const isCoinDialogOpen = ref(false)
 const profileMenuRef = ref<HTMLElement | null>(null)
 
 const unreadCount = computed(() => userStore.unreadCount())
+const enrollmentSlotText = computed(() => {
+  if (auth.user?.activeRole !== 'student') return ''
+  if (typeof auth.user.enrollmentSlotLimit !== 'number') return ''
+  return `${auth.user.activeEnrollments ?? 0}/${auth.user.enrollmentSlotLimit}`
+})
 const roleLabels: Record<UserRole, string> = {
   student: 'Студент',
   teacher: 'Преподаватель',
@@ -85,6 +90,7 @@ function handleDocumentPointerDown(event: PointerEvent) {
 
 onMounted(() => {
   document.addEventListener('pointerdown', handleDocumentPointerDown)
+  if (auth.user?.roles.includes('student')) void userStore.fetchStats().catch(() => undefined)
 })
 
 onBeforeUnmount(() => {
@@ -115,6 +121,11 @@ onBeforeUnmount(() => {
         <span class="level-value">{{ auth.user.level }}</span>
       </div>
 
+      <div v-if="enrollmentSlotText" class="slot-chip" title="Занятые слоты записи / доступные слоты">
+        <AppIcon class="slot-icon" icon="calendar" :size="15" />
+        <span class="slot-value">{{ enrollmentSlotText }}</span>
+      </div>
+
       <button class="notif-btn" type="button" aria-label="Уведомления" @click="$router.push('/notifications')">
         <AppIcon icon="bell" :size="18" />
         <span class="notif-dot" v-if="auth.user && unreadCount > 0">
@@ -277,6 +288,26 @@ onBeforeUnmount(() => {
   font-size: 14px;
   font-weight: 800;
 }
+.slot-chip {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  height: 28px;
+  padding: 0 10px;
+  border: 1px solid var(--color-primary-a20);
+  border-radius: 20px;
+  background: var(--color-primary-a10);
+  color: var(--color-success-text);
+  cursor: default;
+  white-space: nowrap;
+}
+.slot-icon {
+  color: var(--color-primary);
+}
+.slot-value {
+  font-size: 13px;
+  font-weight: 800;
+}
 .notif-btn {
   position: relative;
   display: inline-flex;

frontend/src/components/ui/EnrollmentLimitModal.vue

@@ -0,0 +1,55 @@
+<script setup lang="ts">
+import { useRouter } from 'vue-router'
+import ModalDialog from './ModalDialog.vue'
+
+defineProps<{
+  modelValue?: boolean
+}>()
+
+const emit = defineEmits<{ 'update:modelValue': [value: boolean] }>()
+const router = useRouter()
+
+function close() {
+  emit('update:modelValue', false)
+}
+
+function openMyLectures() {
+  close()
+  router.push('/my-lectures')
+}
+</script>
+
+<template>
+  <ModalDialog :model-value="modelValue" title="Лимит записей достигнут" @update:model-value="emit('update:modelValue', $event)">
+    <div class="limit-modal">
+      <p>
+        Все доступные слоты записи уже заняты. Чтобы записаться на новую лекцию, отмените одну из текущих записей
+        или повысьте уровень.
+      </p>
+      <div class="limit-actions">
+        <button class="btn-secondary" type="button" @click="close">Понятно</button>
+        <button class="btn-primary" type="button" @click="openMyLectures">Мои записи</button>
+      </div>
+    </div>
+  </ModalDialog>
+</template>
+
+<style scoped>
+.limit-modal {
+  display: flex;
+  flex-direction: column;
+  gap: 16px;
+}
+.limit-modal p {
+  margin: 0;
+  color: var(--color-text-secondary);
+  font-size: 14px;
+  line-height: 1.5;
+}
+.limit-actions {
+  display: flex;
+  justify-content: flex-end;
+  gap: 10px;
+  flex-wrap: wrap;
+}
+</style>

frontend/src/components/ui/LectureCard.vue

@@ -1,7 +1,10 @@
 <script setup lang="ts">
 import type { Lecture } from '@/types'
+import { computed, ref } from 'vue'
 import { useRouter } from 'vue-router'
+import { useUserStore } from '@/stores/user'
 import AppIcon from '@/components/ui/AppIcon.vue'
+import EnrollmentLimitModal from '@/components/ui/EnrollmentLimitModal.vue'
 
 const props = defineProps<{
   lecture: Lecture
@@ -10,6 +13,11 @@ const props = defineProps<{
 }>()
 const emit = defineEmits<{ register: [id: string] }>()
 const router = useRouter()
+const userStore = useUserStore()
+const enrollmentLimitModalOpen = ref(false)
+const isRegistrationLimitReached = computed(() =>
+  !props.registered && !userStore.hasEnrollmentSlotAvailable
+)
 
 function formatDate(d: string) {
   const date = new Date(d)
@@ -24,6 +32,15 @@ function starsHtml(rating: number) {
 function goDetail() {
   router.push(`/lecture/${props.lecture.id}`)
 }
+
+function register() {
+  if (isRegistrationLimitReached.value) {
+    enrollmentLimitModalOpen.value = true
+    return
+  }
+
+  emit('register', props.lecture.id)
+}
 </script>
 
 <template>
@@ -98,7 +115,7 @@ function goDetail() {
       <button
         v-else-if="lecture.freeSeats > 0 && !lecture.registrationClosed"
         class="btn-primary btn-sm"
-        @click.stop="emit('register', lecture.id)"
+        @click.stop="register"
       >
         Записаться
       </button>
@@ -106,6 +123,7 @@ function goDetail() {
         {{ lecture.registrationClosed ? 'Запись закрыта' : 'Мест нет' }}
       </button>
     </div>
+    <EnrollmentLimitModal v-model="enrollmentLimitModalOpen" />
   </div>
 </template>
 

frontend/src/stores/lectures.ts

@@ -3,6 +3,7 @@ import { computed, ref } from 'vue'
 import { lecturesApi, usersApi } from '@/api'
 import { mapApiLecture, mapApiReview } from '@/api/mappers'
 import type { Lecture, Review } from '@/types'
+import { useUserStore } from './user'
 
 export const useLecturesStore = defineStore('lectures', () => {
   const lectures = ref<Lecture[]>([])
@@ -74,16 +75,23 @@ export const useLecturesStore = defineStore('lectures', () => {
   async function register(lectureId: string) {
     const lecture = lectures.value.find(item => item.id === lectureId)
     if (!lecture || lecture.freeSeats === 0 || lecture.registrationClosed || registered.value.includes(lectureId)) return
+    const userStore = useUserStore()
+    if (!userStore.hasEnrollmentSlotAvailable) {
+      throw new Error('Лимит записей достигнут. Отмените одну из записей или повысьте уровень.')
+    }
 
     await lecturesApi.enroll(lectureId)
     registered.value.push(lectureId)
     lecture.freeSeats = Math.max(lecture.freeSeats - 1, 0)
     lecture.enrolledSeats += 1
     lecture.registered = true
+    userStore.adjustActiveEnrollments(1)
+    await userStore.fetchStats().catch(() => undefined)
   }
 
   async function unregister(lectureId: string) {
     await lecturesApi.unenroll(lectureId)
+    const userStore = useUserStore()
     registered.value = registered.value.filter(id => id !== lectureId)
     const lecture = lectures.value.find(item => item.id === lectureId)
     if (lecture) {
@@ -91,6 +99,8 @@ export const useLecturesStore = defineStore('lectures', () => {
       lecture.enrolledSeats = Math.max(lecture.enrolledSeats - 1, 0)
       lecture.registered = false
     }
+    userStore.adjustActiveEnrollments(-1)
+    await userStore.fetchStats().catch(() => undefined)
   }
 
   function isRegistered(lectureId: string) {

frontend/src/stores/user.ts

@@ -1,7 +1,8 @@
 import { defineStore } from 'pinia'
-import { ref } from 'vue'
+import { computed, ref } from 'vue'
 import { achievementsApi, notificationsApi, usersApi } from '@/api'
 import { mapApiAchievement, mapApiCoinTransaction, mapApiNotification } from '@/api/mappers'
+import type { UserStatsDto } from '@/api/types'
 import type { Achievement, CoinTransaction, Notification } from '@/types'
 import { useAuthStore } from './auth'
 
@@ -11,6 +12,53 @@ export const useUserStore = defineStore('user', () => {
   const coinHistory = ref<CoinTransaction[]>([])
   const loading = ref(false)
   const error = ref<string | null>(null)
+  const activeEnrollments = computed(() => useAuthStore().user?.activeEnrollments ?? 0)
+  const enrollmentSlotLimit = computed(() => useAuthStore().user?.enrollmentSlotLimit ?? 0)
+  const hasEnrollmentSlotAvailable = computed(() =>
+    enrollmentSlotLimit.value === 0 || activeEnrollments.value < enrollmentSlotLimit.value
+  )
+
+  function applyStats(stats: UserStatsDto) {
+    const auth = useAuthStore()
+    if (!auth.user) return
+
+    auth.setUser({
+      ...auth.user,
+      coins: stats.coins,
+      level: stats.level,
+      xp: stats.xp,
+      currentLevelXp: stats.currentLevelXp,
+      nextLevelXp: stats.nextLevelXp,
+      lecturesAttended: stats.attendedLectures,
+      hoursLearned: Math.round(stats.attendedLectures * 1.5 * 10) / 10,
+      achievements: Array.from({ length: stats.achievementsCount }, (_, index) => String(index + 1)),
+      activeEnrollments: stats.activeEnrollments,
+      enrollmentSlotLimit: stats.enrollmentSlotLimit,
+      enrollmentSlotRules: stats.enrollmentSlotRules,
+    })
+  }
+
+  async function fetchStats() {
+    error.value = null
+    try {
+      const stats = await usersApi.myStats()
+      applyStats(stats)
+      return stats
+    } catch (err) {
+      error.value = err instanceof Error ? err.message : 'Не удалось загрузить статистику профиля.'
+      throw err
+    }
+  }
+
+  function adjustActiveEnrollments(delta: number) {
+    const auth = useAuthStore()
+    if (!auth.user || typeof auth.user.activeEnrollments !== 'number') return
+
+    auth.setUser({
+      ...auth.user,
+      activeEnrollments: Math.max(auth.user.activeEnrollments + delta, 0),
+    })
+  }
 
   async function fetchStudentData() {
     const auth = useAuthStore()
@@ -29,19 +77,7 @@ export const useUserStore = defineStore('user', () => {
         notificationsApi.list(),
       ])
 
-      if (auth.user) {
-        auth.setUser({
-          ...auth.user,
-          coins: stats.coins,
-          level: stats.level,
-          xp: stats.xp,
-          currentLevelXp: stats.currentLevelXp,
-          nextLevelXp: stats.nextLevelXp,
-          lecturesAttended: stats.attendedLectures,
-          hoursLearned: Math.round(stats.attendedLectures * 1.5 * 10) / 10,
-          achievements: Array.from({ length: stats.achievementsCount }, (_, index) => String(index + 1)),
-        })
-      }
+      applyStats(stats)
       const unlocked = new Map(achievementPayload.map(item => {
         const achievement = mapApiAchievement(item)
         return [achievement.id, achievement]
@@ -85,6 +121,11 @@ export const useUserStore = defineStore('user', () => {
     coinHistory,
     loading,
     error,
+    activeEnrollments,
+    enrollmentSlotLimit,
+    hasEnrollmentSlotAvailable,
+    fetchStats,
+    adjustActiveEnrollments,
     fetchStudentData,
     fetchNotifications,
     markAllRead,

frontend/src/types/index.ts

@@ -18,6 +18,14 @@ export interface User {
   lecturesAttended?: number
   hoursLearned?: number
   achievements?: string[]
+  activeEnrollments?: number
+  enrollmentSlotLimit?: number
+  enrollmentSlotRules?: EnrollmentSlotRule[]
+}
+
+export interface EnrollmentSlotRule {
+  level: number
+  slots: number
 }
 
 export interface Lecture {

frontend/src/views/student/CatalogView.vue

@@ -8,6 +8,7 @@ import FilterChips from '@/components/ui/FilterChips.vue'
 import EmptyState from '@/components/ui/EmptyState.vue'
 import DataTable from '@/components/ui/DataTable.vue'
 import ModalDialog from '@/components/ui/ModalDialog.vue'
+import EnrollmentLimitModal from '@/components/ui/EnrollmentLimitModal.vue'
 
 const lecturesStore = useLecturesStore()
 const search = ref('')
@@ -19,6 +20,7 @@ const building = ref('Все корпуса')
 const format = ref<'all' | 'online' | 'offline'>('all')
 const onlyFree = ref(false)
 const filtersOpen = ref(false)
+const enrollmentLimitModalOpen = ref(false)
 const addToast = inject('addToast') as ((message: string, type?: 'success' | 'error' | 'info') => void) | undefined
 
 onMounted(() => {
@@ -101,11 +103,19 @@ const calendarGroups = computed(() => {
   return Object.entries(groups)
 })
 
+function isEnrollmentLimitError(err: unknown) {
+  return err instanceof Error && err.message.includes('Лимит записей достигнут')
+}
+
 async function registerLecture(id: string) {
   try {
     await lecturesStore.register(id)
     addToast?.('Вы записаны на лекцию.', 'success')
   } catch (err) {
+    if (isEnrollmentLimitError(err)) {
+      enrollmentLimitModalOpen.value = true
+      return
+    }
     addToast?.(err instanceof Error ? err.message : 'Не удалось записаться на лекцию.', 'error')
   }
 }
@@ -297,6 +307,8 @@ function isRegistered(id: string) {
         <button class="btn-primary" @click="filtersOpen = false">Применить</button>
       </template>
     </ModalDialog>
+
+    <EnrollmentLimitModal v-model="enrollmentLimitModalOpen" />
   </div>
 </template>
 

frontend/src/views/student/DashboardView.vue

@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { computed, onMounted } from 'vue'
+import { computed, inject, onMounted, ref } from 'vue'
 import { useRouter } from 'vue-router'
 import { useAuthStore } from '@/stores/auth'
 import { useLecturesStore } from '@/stores/lectures'
@@ -11,12 +11,15 @@ import ProgressBar from '@/components/ui/ProgressBar.vue'
 import AchievementBadge from '@/components/ui/AchievementBadge.vue'
 import EmptyState from '@/components/ui/EmptyState.vue'
 import AppIcon from '@/components/ui/AppIcon.vue'
+import EnrollmentLimitModal from '@/components/ui/EnrollmentLimitModal.vue'
 import { formatUserName } from '@/utils/formatUserName'
 
 const auth = useAuthStore()
 const lectures = useLecturesStore()
 const userStore = useUserStore()
 const router = useRouter()
+const enrollmentLimitModalOpen = ref(false)
+const addToast = inject('addToast') as ((message: string, type?: 'success' | 'error' | 'info') => void) | undefined
 
 const user = computed(() => auth.user!)
 
@@ -60,6 +63,19 @@ onMounted(async () => {
   ])
   await lectures.fetchRegisteredForCurrentUser()
 })
+
+async function registerLecture(id: string) {
+  try {
+    await lectures.register(id)
+    addToast?.('Вы записаны на лекцию.', 'success')
+  } catch (err) {
+    if (err instanceof Error && err.message.includes('Лимит записей достигнут')) {
+      enrollmentLimitModalOpen.value = true
+      return
+    }
+    addToast?.(err instanceof Error ? err.message : 'Не удалось записаться на лекцию.', 'error')
+  }
+}
 </script>
 
 <template>
@@ -128,7 +144,7 @@ onMounted(async () => {
         <h2 class="section-title">
           <span class="title-with-icon">
             <AppIcon class="title-icon" icon="sparkles" :size="18" />
-            Рекомендуемые лекции
+            Ближайшие лекции
           </span>
         </h2>
         <button class="link-btn" @click="router.push('/catalog')">Все лекции →</button>
@@ -140,7 +156,7 @@ onMounted(async () => {
           :key="l.id"
           :lecture="l"
           :registered="lectures.registeredIds.includes(l.id)"
-          @register="lectures.register"
+          @register="registerLecture"
         />
       </div>
     </section>
@@ -182,6 +198,8 @@ onMounted(async () => {
         </div>
       </GlassCard>
     </section>
+
+    <EnrollmentLimitModal v-model="enrollmentLimitModalOpen" />
   </div>
 </template>
 

frontend/src/views/student/LectureDetailView.vue

@@ -1,19 +1,25 @@
 <script setup lang="ts">
-import { computed, onMounted } from 'vue'
+import { computed, inject, onMounted, ref } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
 import { useLecturesStore } from '@/stores/lectures'
+import { useUserStore } from '@/stores/user'
 import GlassCard from '@/components/ui/GlassCard.vue'
 import LectureCard from '@/components/ui/LectureCard.vue'
 import StatusBadge from '@/components/ui/StatusBadge.vue'
 import EmptyState from '@/components/ui/EmptyState.vue'
+import EnrollmentLimitModal from '@/components/ui/EnrollmentLimitModal.vue'
 
 const route = useRoute()
 const router = useRouter()
 const lecturesStore = useLecturesStore()
+const userStore = useUserStore()
+const addToast = inject('addToast') as ((message: string, type?: 'success' | 'error' | 'info') => void) | undefined
+const enrollmentLimitModalOpen = ref(false)
 
 const lectureId = computed(() => String(route.params.id))
 const lecture = computed(() => lecturesStore.all.find(l => l.id === lectureId.value))
 const isRegistered = computed(() => (lecture.value ? lecturesStore.isRegistered(lecture.value.id) : false))
+const slotRegistrationDisabled = computed(() => !userStore.hasEnrollmentSlotAvailable && !isRegistered.value)
 const isAttended = computed(() => lecture.value?.status === 'completed')
 const reviews = computed(() => lecturesStore.reviewsByLecture[lectureId.value] ?? [])
 
@@ -24,6 +30,25 @@ onMounted(async () => {
   await lecturesStore.fetchLecture(lectureId.value)
   await lecturesStore.fetchReviews(lectureId.value)
 })
+
+async function registerLecture() {
+  if (!lecture.value) return
+  if (slotRegistrationDisabled.value) {
+    enrollmentLimitModalOpen.value = true
+    return
+  }
+
+  try {
+    await lecturesStore.register(lecture.value.id)
+    addToast?.('Вы записаны на лекцию.', 'success')
+  } catch (err) {
+    if (err instanceof Error && err.message.includes('Лимит записей достигнут')) {
+      enrollmentLimitModalOpen.value = true
+      return
+    }
+    addToast?.(err instanceof Error ? err.message : 'Не удалось записаться на лекцию.', 'error')
+  }
+}
 </script>
 
 <template>
@@ -49,7 +74,7 @@ onMounted(async () => {
           v-if="!isRegistered"
           class="btn-primary"
           :disabled="lecture.freeSeats === 0 || lecture.registrationClosed"
-          @click="lecturesStore.register(lecture.id)"
+          @click="registerLecture"
         >
           Записаться
         </button>
@@ -107,6 +132,8 @@ onMounted(async () => {
         <LectureCard v-for="l in similarLectures" :key="l.id" :lecture="l" />
       </div>
     </section>
+
+    <EnrollmentLimitModal v-model="enrollmentLimitModalOpen" />
   </div>
 </template>
 

frontend/src/views/student/ProfileView.vue

@@ -6,6 +6,7 @@ import GlassCard from '@/components/ui/GlassCard.vue'
 import ProgressBar from '@/components/ui/ProgressBar.vue'
 import AchievementBadge from '@/components/ui/AchievementBadge.vue'
 import EmptyState from '@/components/ui/EmptyState.vue'
+import AppIcon from '@/components/ui/AppIcon.vue'
 
 const auth = useAuthStore()
 const userStore = useUserStore()
@@ -41,6 +42,20 @@ const levelProgressLabel = computed(() =>
 const levelProgressText = computed(() =>
   hasNextLevel.value ? `${levelProgress.value} / ${levelProgressMax.value} XP` : `${userXp.value} XP`
 )
+const activeEnrollments = computed(() => user.value.activeEnrollments ?? 0)
+const enrollmentSlotLimit = computed(() => user.value.enrollmentSlotLimit ?? 0)
+const enrollmentSlotsRemaining = computed(() =>
+  Math.max(enrollmentSlotLimit.value - activeEnrollments.value, 0)
+)
+const enrollmentSlotRules = computed(() => user.value.enrollmentSlotRules ?? [])
+const enrollmentSlotText = computed(() =>
+  enrollmentSlotLimit.value ? `${activeEnrollments.value} / ${enrollmentSlotLimit.value}` : '...'
+)
+const enrollmentSlotHint = computed(() => {
+  if (!enrollmentSlotLimit.value) return 'Загружаем лимит активных записей.'
+  if (enrollmentSlotsRemaining.value === 0) return 'Все слоты заняты. Отмените запись, дождитесь отметки посещения или повышайте уровень.'
+  return `Можно записаться еще на ${formatLectureCount(enrollmentSlotsRemaining.value)}.`
+})
 const unlockedAchievements = computed(() => userStore.achievements.filter(a => a.unlocked))
 const lockedAchievements = computed(() => userStore.achievements.filter(a => !a.unlocked))
 const interestTags = ref([
@@ -54,6 +69,22 @@ const interestTags = ref([
 
 const notificationSettings = ref({ email: true })
 
+function formatSlotCount(slots: number) {
+  const lastDigit = slots % 10
+  const lastTwoDigits = slots % 100
+  if (lastDigit === 1 && lastTwoDigits !== 11) return `${slots} слот`
+  if (lastDigit >= 2 && lastDigit <= 4 && (lastTwoDigits < 12 || lastTwoDigits > 14)) return `${slots} слота`
+  return `${slots} слотов`
+}
+
+function formatLectureCount(count: number) {
+  const lastDigit = count % 10
+  const lastTwoDigits = count % 100
+  if (lastDigit === 1 && lastTwoDigits !== 11) return `${count} лекцию`
+  if (lastDigit >= 2 && lastDigit <= 4 && (lastTwoDigits < 12 || lastTwoDigits > 14)) return `${count} лекции`
+  return `${count} лекций`
+}
+
 onMounted(() => {
   void userStore.fetchStudentData()
 })
@@ -99,6 +130,28 @@ onMounted(() => {
         </div>
       </GlassCard>
 
+      <GlassCard>
+        <div class="section-title">Слоты записи</div>
+        <div class="slot-overview">
+          <div class="slot-meter">
+            <AppIcon icon="calendar" :size="22" />
+            <span>{{ enrollmentSlotText }}</span>
+          </div>
+          <p class="slot-hint">{{ enrollmentSlotHint }}</p>
+        </div>
+        <div class="slot-rules" v-if="enrollmentSlotRules.length">
+          <div
+            v-for="rule in enrollmentSlotRules"
+            :key="rule.level"
+            class="slot-rule"
+            :class="{ active: user.level >= rule.level }"
+          >
+            <span>Ур. {{ rule.level }}</span>
+            <strong>{{ formatSlotCount(rule.slots) }}</strong>
+          </div>
+        </div>
+      </GlassCard>
+
       <GlassCard>
         <div class="section-title">Настройки уведомлений</div>
         <div class="settings">
@@ -167,8 +220,71 @@ onMounted(() => {
 .level { margin: 16px 0; }
 .level-header { display: flex; justify-content: space-between; font-size: 12px; color: var(--color-text-secondary); margin-bottom: 6px; }
 .tags-grid { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
+.slot-overview {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 14px;
+  margin: 14px 0;
+}
+.slot-meter {
+  display: inline-flex;
+  align-items: center;
+  gap: 10px;
+  min-width: 106px;
+  color: var(--color-primary-dark);
+  font-size: 26px;
+  font-weight: 800;
+}
+.slot-meter :deep(.app-icon) {
+  color: var(--color-primary);
+}
+.slot-hint {
+  margin: 0;
+  color: var(--color-text-secondary);
+  font-size: 13px;
+  line-height: 1.4;
+  text-align: right;
+}
+.slot-rules {
+  display: grid;
+  grid-template-columns: repeat(3, minmax(0, 1fr));
+  gap: 8px;
+}
+.slot-rule {
+  display: flex;
+  flex-direction: column;
+  gap: 3px;
+  padding: 10px;
+  border: 1px solid var(--color-slate-500-a20);
+  border-radius: var(--radius-sm);
+  background: var(--color-white-a50);
+}
+.slot-rule span {
+  color: var(--color-text-secondary);
+  font-size: 12px;
+  font-weight: 700;
+}
+.slot-rule strong {
+  color: var(--color-text);
+  font-size: 13px;
+}
+.slot-rule.active {
+  border-color: var(--color-primary-a30);
+  background: var(--color-primary-a08);
+}
 .settings { display: flex; flex-direction: column; gap: 8px; }
 .setting { font-size: 13px; color: var(--color-text-secondary); display: flex; gap: 8px; align-items: center; }
 .achievements-section { display: flex; flex-direction: column; gap: 12px; margin-top: 18px; }
 .achievements-list { display: flex; flex-direction: column; gap: 12px; }
+
+@media (max-width: 520px) {
+  .slot-overview {
+    align-items: flex-start;
+    flex-direction: column;
+  }
+  .slot-hint {
+    text-align: left;
+  }
+}
 </style>