* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Microsoft YaHei', ABeeZee, Arial, sans-serif;
            background: #F7F9FD;
            min-height: 100vh;
            position: relative;
            overflow-x: hidden;
        }

        /* 背景装饰元素 */
        .background-decorations {
            position: absolute;
            top: -1208px;
            left: -350px;
            width: 100%;
            height: 100%;
            opacity: 0.35;
            z-index: 0;
            pointer-events: none;
        }

        .bg-ellipse {
            position: absolute;
            border-radius: 50%;
            filter: blur(471px);
        }

        .bg-ellipse-1 {
            top: 0;
            left: 0;
            width: 997px;
            height: 1448px;
            background: #02B689;
        }

        .bg-ellipse-2 {
            top: 1428px;
            left: 342px;
            width: 248px;
            height: 748px;
            background: #219CAF;
        }

        .bg-ellipse-3 {
            top: 1768px;
            left: 1990px;
            width: 248px;
            height: 748px;
            background: #C2E1FF;
        }

        .bg-ellipse-4 {
            top: 2947px;
            left: 762px;
            width: 248px;
            height: 748px;
            background: #88ABF7;
        }

        /* 顶部导航栏 */
        .header {
            position: relative;
            z-index: 100;
            background: rgba(255, 255, 255, 0.22);
            backdrop-filter: blur(53.3px);
            height: 79px;
            box-shadow: 0px 4px 12px rgba(0, 0, 0, 0.09);
        }

        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 68px;
            height: 100%;
        }

        @media (max-width: 768px) {
            .header .container {
                padding: 0 20px;
            }
        }

        .logo-section {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-shrink: 0;
        }

        .logo {
            display: flex;
            align-items: center;
        }

        .logo-text {
            font-size: 28px;
            font-weight: 700;
            color: #000000;
            line-height: 1.21em;
        }

        .logo-icon {
            width: 12px;
            height: 12px;
            background: url('./assets/main-logo-1.svg') no-repeat center;
            background-size: contain;
        }

        .logo-subtitle {
            font-size: 20px;
            font-weight: 700;
            color: #000000;
            margin-left: 8px;
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 42px;
            font-size: 14px !important;
        }

        @media (max-width: 768px) {
            .nav-menu {
                position: fixed;
                top: 92px;
                left: -100%;
                width: 100%;
                height: calc(100vh - 92px);
                background: #ffffff;
                flex-direction: column;
                justify-content: flex-start;
                align-items: center;
                padding: 20px;
                transition: left 0.3s ease;
                box-shadow: 0px 4px 12px rgba(0, 0, 0, 0.09);
                z-index: 99;
            }

            .nav-menu.active {
                left: 0;
            }

            .mobile-menu-toggle {
                display: flex;
            }
        }

        .nav-item {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px !important;
            color: #000000;
            text-decoration: none;
            position: relative;
            white-space: nowrap;
            cursor: pointer;
        }

        @media (max-width: 768px) {
            .nav-item {
                padding: 12px 0;
                width: 100%;
                text-align: center;
                justify-content: center;
                border-bottom: 1px solid #F0F0F0;
            }
        }

        .nav-item.active {
            font-weight: 700;
            color: #1682e6;
        }

        .nav-item-icon {
            width: 26px;
            height: 26px;
            background-size: contain;
            flex-shrink: 0;
        }

        .nav-item.paper-check .nav-item-icon {
            background: url('./assets/paper-check-icon.svg') no-repeat center;
        }

        .nav-item.aigc .nav-item-icon {
            background: url('./assets/aigc-check-icon.svg') no-repeat center;
        }

        .nav-item.write .nav-item-icon {
            background: url('./assets/write-paper-icon.svg') no-repeat center;
        }

        .nav-item.ppt .nav-item-icon {
            background: url('./assets/ppt-icon.svg') no-repeat center;
        }

        .nav-item.activity .nav-item-icon {
            background: url('./assets/activity-icon.svg') no-repeat center;
        }

        .nav-item.more .nav-item-icon {
            background: url('./assets/more-icon.svg') no-repeat center;
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-shrink: 0;
        }

        .action-buttons {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-shrink: 0;
        }

        @media (max-width: 768px) {
            .action-buttons {
                display: none;
            }
        }

        .btn-free {
            background: #1682e6;
            color: #FFFFFF;
            padding: 9px 20px;
            border-radius: 20px;
            font-size: 20px;
            font-weight: 700;
            text-decoration: none;
            box-shadow: 0px 4px 4px rgba(31, 169, 131, 0.21);
        }

        .btn-login {
            background: #FFFFFF;
            color: #1682e6;
            padding: 4px 20px !important;
            border: 1px solid #1682e6;
            border-radius: 20px;
            font-size: 14px !important;
            font-weight: 500 !important;
            text-decoration: none;
            box-shadow: 0px 4px 4px rgba(31, 169, 131, 0.21);
            cursor: pointer;
        }

        .action-buttons .btn-login {
            background: #FFFFFF;
            color: #1682e6;
            padding: 9px 20px;
            border: 1px solid #1682e6;
            border-radius: 20px;
            font-size: 20px;
            font-weight: 700;
            text-decoration: none;
            box-shadow: 0px 4px 4px rgba(31, 169, 131, 0.21);
            cursor: pointer;
        }

        /* 移动端汉堡菜单 */
        .mobile-menu-toggle {
            display: none;
            flex-direction: column;
            gap: 4px;
            cursor: pointer;
            padding: 8px;
        }

        .hamburger-line {
            width: 24px;
            height: 3px;
            background: #000000;
            border-radius: 2px;
            transition: all 0.3s ease;
        }

        .mobile-menu-toggle span {
            width: 24px;
            height: 3px;
            background: #000000;
            border-radius: 2px;
            transition: all 0.3s ease;
            display: block;
        }

        .mobile-menu-toggle.active .hamburger-line:nth-child(1) {
            transform: rotate(45deg) translate(6px, 6px);
        }

        .mobile-menu-toggle.active .hamburger-line:nth-child(2) {
            opacity: 0;
        }

        .mobile-menu-toggle.active .hamburger-line:nth-child(3) {
            transform: rotate(-45deg) translate(6px, -6px);
        }

        .mobile-menu-toggle.active span:nth-child(1) {
            transform: rotate(45deg) translate(6px, 6px);
        }

        .mobile-menu-toggle.active span:nth-child(2) {
            opacity: 0;
        }

        .mobile-menu-toggle.active span:nth-child(3) {
            transform: rotate(-45deg) translate(6px, -6px);
        }

        .mobile-nav {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            background: #FFFFFF;
            box-shadow: 0px 4px 12px rgba(0, 0, 0, 0.09);
            padding: 20px;
            flex-direction: column;
            gap: 16px;
        }

        .mobile-nav.active {
            display: flex;
        }

        .mobile-nav .nav-item {
            padding: 12px 0;
            border-bottom: 1px solid #F0F0F0;
        }

        .mobile-nav .header-actions {
            flex-direction: column;
            gap: 12px;
            margin-top: 16px;
        }

        .mobile-nav .btn-free,
        .mobile-nav .btn-login {
            text-align: center;
            width: 100%;
        }
        .newcontent{
            display: flex;
        }
        /* 主内容区域 */
        .main-content {
            flex: 5;
            position: relative;
            z-index: 10;
            padding: 48px 30px 0;
        }

        /* 套餐选择区域 */
        .packages-section {
            display: flex;
            gap: 16px;
            margin-bottom: 54px;
            padding: 0 10px;
        }

        .package-card {
            background: #FFFFFF;
            border-radius: 40px;
            padding: 25px 20px;
            width: 35%;
            min-height: 200px;
            position: relative;
            box-sizing: border-box;
        }

        .package-card.premium {
            border: 2px solid #1682e6;
        }

        .package-header {
            display: flex;
            align-items: center;
            gap: 16px;
            justify-content: space-between;
            margin-bottom: 22px;
            padding: 0 8px;
        }

        .package-title {
            font-size: 20px;
            font-weight: 700;
            color: #000000;
            word-wrap: break-word;
        }

        .package-price {
            font-size: 16px;
            color: #7E7E7E;
            white-space: nowrap;
            flex-shrink: 0;
        }

        .package-desc {
            font-size: 14px;
            color: #7E7E7E;
            text-align: center;
            margin-bottom: 24px;
            word-wrap: break-word;
            hyphens: auto;
        }

        .package-features {
            display: flex;
            flex-direction: column;
            gap: 13px;
        }

        .package-feature {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 14px;
            gap: 8px;
        }

        .feature-label {
            color: #000000;
            word-wrap: break-word;
            flex: 1;
        }

        .feature-value {
            color: #1682e6;
            text-align: right;
            white-space: nowrap;
            flex-shrink: 0;
        }

        .fire-icon {
            width: 20px;
            height: 20px;
            margin-left: 8px;
            flex-shrink: 0;
        }



        /* AIGC特殊样式 */
        .aigc-package {
            position: relative;
        }

        .aigc-badge {
            position: absolute;
            bottom: 24px;
            left: 50%;
            width: calc(100% - 60px);
            max-width: 292px;
            transform: translateX(-50%);
            background: #FFF3F3;
            border-radius: 20px;
            padding: 6px 34px;
            font-size: 14px;
            color: #FF7D20;
            display: flex;
            align-items: center;
            gap: 6px;
            word-wrap: break-word;
            text-align: center;
            box-sizing: border-box;
        }

        .aigc-badge::before {
            content: '';
            width: 31px;
            height: 31px;
            background: url('./assets/fire-icon.svg') no-repeat center;
            background-size: contain;
            flex-shrink: 0;
        }

        /* 文件上传区域 */
        .upload-section {
            background: #FFFFFF;
            border-radius: 40px;
            padding: 44px 32px;
            margin-bottom: 40px;
            box-sizing: border-box;
        }

        .upload-methods {
            display: flex;
            align-items: flex-end;
            gap: 31px;
            margin-bottom: 32px;
            flex-wrap: wrap;
        }

        .upload-title {
            font-size: 18px;
            font-weight: 700;
            color: #000000;
            white-space: nowrap;
        }

        .upload-options {
            display: flex;
            gap: 7px;
            flex-wrap: wrap;
        }

        .upload-option {
            display: flex;
            align-items: center;
            gap: 7px;
            padding: 8px 16px;
            border: 2px solid #B3B3B3;
            border-radius: 50px;
            background: transparent;
            color: #1A1A1A;
            font-size: 16px;
            cursor: pointer;
            position: relative;
            white-space: nowrap;
        }

        .upload-option.active {
            border-color: #1682e6;
        }

        .upload-option.active::after {
            content: '';
            position: absolute;
            right: 5px;
            top: 50%;
            transform: translateY(-50%);
            width: 10px;
            height: 10px;
            background: #1682e6;
            border-radius: 50%;
        }

        .upload-area {
            border: 2px dashed #B3B3B3;
            border-radius: 24px;
            padding: 41px 20px;
            background: rgba(217, 217, 217, 0);
            text-align: center;
            margin-bottom: 40px;
        }

        .upload-icon {
            width: 138px;
            height: 138px;
            background: url('./assets/upload-icon.png') no-repeat center;
            background-size: contain;
            margin: 0 auto 13px;
            max-width: 100%;
        }

        .upload-text {
            font-size: 18px;
            color: #1A1A1A;
            margin-bottom: 13px;
            word-wrap: break-word;
        }

        .upload-formats {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            font-size: 18px;
            color: #7E7E7E;
            flex-wrap: wrap;
        }

        .format-icon {
            width: 38px;
            height: 38px;
            flex-shrink: 0;
        }

        .doc-icon {
            background: url('./assets/doc-icon.png') no-repeat center;
            background-size: contain;
        }

        .docx-icon {
            background: url('./assets/docx-icon.png') no-repeat center;
            background-size: contain;
        }

        .txt-icon {
            background: url('./assets/txt-icon-bg.png') no-repeat center;
            background-size: contain;
        }

        .submit-btn {
            background: #1682e6;
            color: #FFFFFF;
            font-size: 20px;
            font-weight: 700;
            padding: 9px 52px;
            border: none;
            border-radius: 10px;
            cursor: pointer;
            box-shadow: 0px 4px 4px rgba(123, 164, 255, 0.41);
            margin: 0 auto;
            display: block;
        }

        /* 右侧边栏 */
        .sidebar {
            flex: 1;
            margin: 0px 30px 0 0;
            padding: 30px 0 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .deepseek-section {
            background: url('./assets/deepseek.svg') no-repeat center;
            background-size: contain;
            border-radius: 40px;
            padding: 0px 36px 30px;
            position: relative;
        }
        .deepseek-section,
            .class-dynamics {
                margin-bottom: 0;
            }

        .deepseek-logo {
            width: 225px;
            height: 41px; 
            background-size: contain;
            margin-bottom: 43px;
        }

        .deepseek-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 1px;
        }

        .deepseek-btn {
            flex: 33%;
            background: rgba(26, 86, 219, 0.14);
            border: 1px solid rgba(255, 255, 255, 0.5);
            border-radius: 10px;
            height: 67px;
            color: #1A1A1A;
            font-size: 16px;
            text-decoration: none;
            box-shadow: 0px 3px 6px rgba(0, 0, 0, 0.11);
            backdrop-filter: blur(135px);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-direction: column;
            gap: 2px;
        }

        .deepseek-btn.primary {
            background: linear-gradient(155deg, #1682e6 0%, #46a6ff 82%);
            color: #FFFFFF;
            font-size: 20px;
            font-weight: 700;
            height: 52px;
            grid-column: span 3;
            margin-top: 14px;
        }

        .deepseek-icon {
            width: 37px;
            height: 37px;
            background: url('./assets/deepseek-item.png') no-repeat center;
            background-size: stretch;
        }

        .class-dynamics {
            background: rgba(255, 255, 255, 0.68);
            border-radius: 40px;
            padding: 40px 36px;
        }

        .dynamics-title {
            font-size: 18px;
            font-weight: 700;
            color: #000000;
            margin-bottom: 37px;
        }

        .dynamics-timeline {
            position: relative;
            padding-left: 28px;
        }

        .timeline-line {
            position: absolute;
            left: 5.5px;
            top: 0;
            bottom: 0;
            width: 1px;
            border-left: 1px dashed #7E7E7E;
        }

        .timeline-dot {
            position: absolute;
            left: -28px;
            width: 10px;
            height: 10px;
            background: #7E7E7E;
            border: 1px solid #D3D3D3;
            border-radius: 50%;
        }

        .dynamics-item {
            margin-bottom: 36px;
            position: relative;
        }

        .dynamics-item:nth-child(1) .timeline-dot { top: 80px; }
        .dynamics-item:nth-child(2) .timeline-dot { top: 120px; }
        .dynamics-item:nth-child(3) .timeline-dot { top: 160px; }

        .dynamics-content {
            display: flex;
            align-items: center;
            gap: 18px;
        }

        .dynamics-avatar {
            width: 34px;
            height: 34px;
            background: url('./assets/class-avatar.png') no-repeat center;
            background-size: stretch;
            border-radius: 50%;
        }

        .dynamics-text {
            flex: 1;
        }

        .dynamics-name {
            font-size: 18px;
            color: #000000;
            margin-bottom: 7px;
        }

        .dynamics-stats {
            font-size: 12px;
            color: #7E7E7E;
        }

        /* 固定侧栏按钮 */
        .fixed-sidebar {
            position: fixed;
            right: 0;
            top: 50%;
            transform: translateY(-50%);
            z-index: 1000;
        }

        .sidebar-btn {
            background: #1682e6;
            color: #FFFFFF;
            padding: 16px 12px 16px 6px;
            border-radius: 8px 0 0 8px;
            text-decoration: none;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 8px;
            font-size: 18px;
            letter-spacing: 31%;
            margin-bottom: 8px;
            width: 36px;
            writing-mode: vertical-lr;
        }

        .sidebar-icon {
            width: 24px;
            height: 24px;
            background-size: contain;
        }

        .customer-service .sidebar-icon {
            background: url('./assets/customer-service-icon.svg') no-repeat center;
        }

        .mobile-app .sidebar-icon {
            background: url('./assets/mobile-icon.svg') no-repeat center;
        }

        /* 底部声明 */
        .footer-notice {
            text-align: center;
            font-size: 16px;
            color: #898989;
            padding: 40px 20px;
            line-height: 1.18em;
            word-wrap: break-word;
            max-width: 1000px;
            margin: 0 auto;
        }


.flex {
  width: 100%;
  height: 100vh;
  background: rgba(16, 17, 18, 0.76);
  display: flex;
  align-items: center;
  justify-content: center;
  top: 0;
  left: 0;
  position: fixed;
  z-index: 9999;
}

.flex .h1 {
  width: 870px;
  /* height: 674px; */
  background: #ffffff;
  border-radius: 40px;
  padding: 40px 80px;
  display: flex;
  align-items: center;
  flex-direction: column;
  position: relative;
  box-sizing: border-box;
  max-height:80vh;
  overflow-y: auto;
}

.flex .h1 h2 {
  text-align: center;
  font-weight: 500;
  font-size: 40px;
  color: #142232;
  line-height: 58px;
}

.flex .cen {
  margin-top: 40px;
  width: 100%;
}

.flex .cen ul {
  display: flex;
  justify-content: space-between;
}

.flex .h1 .can {
  margin-top: 100px;
  width: 286px;
  height: 48px;
  border-radius: 12px 12px 12px 12px;
  border: 1px solid rgba(0, 0, 0, 0.25);
  font-weight: 400;
  font-size: 16px;
  color: #727a84;
  line-height: 1;
  padding: 16px 0;
  text-align: center;
}

.flex .cen ul li h3 {
  width: 284px;
  height: 60px;
  font-weight: 600;
  font-size: 20px;
  color: #142232;
  line-height: 60px;
  border-bottom: 1px solid #d0d3d6;
  margin-bottom: 30px;
}

.flex .cen ul li p {
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 400;
  font-size: 14px;
  color: #11b95c;
  line-height: 24px;
}
.flex .cen ul li .free {
  font-weight: 400;
  font-size: 12px;
  color: #11b95c;
  line-height: 20px;
}
.flex .cen ul li p span {
  margin-right: 18px;
  color: #434e5b;
}

.flex .cen ul li p img {
  width: 16px;
  height: 16px;
  margin-left: 8px;
}

.flex .cen ul li .mi {
  width: 100%;

  border-radius: 12px;

  display: flex;
  justify-content: space-between;
  padding: 0 0 24px 0;
  align-items: center;
}

.flex .cen ul li .mi .input {
  display: flex;
  align-items: center;
  height: 40px;
  border: 1px solid #d0d3d6;
  width: 100%;
  border-radius: 12px;
  padding: 0 12px;
}

.flex .cen ul li .mi img {
  width: 16px;
  height: 16px;
}

.flex .cen ul li .mi .input input {
  flex: 1;
  font-weight: 400;
  font-size: 16px;
  color: #142232;
  line-height: 24px;
  margin-left: 8px;
}

.flex .cen ul li .mi .input img {
  width: 16px;
  height: 16px;
}
.flex .cen ul li .button {
  margin-top: 54px;
  display: flex;
  flex-direction: column;
}
.flex .cen ul li .button button {
  width: 100%;
  height: 48px;
  font-weight: 500;
  font-size: 16px;
  color: #ffffff;
  line-height: 24px;
  text-align: center;
  background: #1890ff;
  border: 0;
  border-radius: 12px;

  margin: 0;
  margin-bottom: 8px;
}

.flex .cen ul li .button .zhu {
  display: flex;
  justify-content: space-between;
}

.flex .cen ul li .button .zhu p span {
  margin: 0;
}


.guanbi {
  cursor: pointer;
  position: absolute;
  right: 20px;
  top: 20px;
  padding: 20px;
  z-index: 999999;
}

.guanbi img {
  width: 24px;
  height: 24px;
}

input {
  outline: none;
  background: none;
}


.er {
  width: 200px;
  height: 200px;

  margin: 8px auto;

  display: flex;
  align-items: center;
  justify-content: center;
}

.er img {
  width: 200px;
  height: 200px;
}

.cursor-pointer{
cursor: pointer;
}

 .submit-btn:hover{
   border: 1px solid rgb(24, 255, 47);
}