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

        body {
            background-color: #F4F0EB;   /* 温润米灰基底，颠覆冷白SaaS感 */
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            color: #2A2825;
            line-height: 1.4;
        }

        /* 自定义更有质感的滚动条 */
        ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }
        ::-webkit-scrollbar-track {
            background: #E5DDD3;
        }
        ::-webkit-scrollbar-thumb {
            background: #B59A7A;
            border-radius: 4px;
        }

        /* 不对称、不完美布局核心 */
        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 32px;
        }

        /* 导航栏 — 非居中，右倾不对称感 */
        .navbar {
            padding: 28px 0 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            border-bottom: 1px solid #E2D8CF;
            position: relative;
        }

        .logo-area {
            display: flex;
            align-items: baseline;
            gap: 8px;
            flex-wrap: wrap;
        }

        .logo {
            font-size: 2rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            background: none;
            color: #C04F2C;  /* 陶土橙，鲜明不紫 */
            text-decoration: none;
        }

        .logo-symbol {
            font-size: 2rem;
            font-weight: 500;
            color: #807564;
        }

        .tagline-nav {
            font-size: 0.75rem;
            color: #8F7A64;
            border-left: 2px solid #D1C0AF;
            padding-left: 12px;
            margin-left: 8px;
            letter-spacing: 0.3px;
        }

        /* 右上方登录/注册/控制台区域 */
        .auth-area {
            display: flex;
            gap: 12px;
            align-items: center;
        }

        .btn-outline {
            background: transparent;
            border: 1px solid #B59A7A;
            padding: 8px 20px;
            border-radius: 40px;
            font-weight: 500;
            font-size: 0.9rem;
            color: #4A3B2C;
            cursor: pointer;
            transition: all 0.2s cubic-bezier(0.2, 0.9, 0.4, 1.1);
            text-decoration: none;
            display: inline-block;
        }

        .btn-outline:hover {
            background: #E8DDD2;
            border-color: #9C7B5C;
            transform: scale(0.96);
        }

        .btn-solid {
            background: #2A2825;
            border: none;
            padding: 8px 20px;
            border-radius: 40px;
            font-weight: 500;
            font-size: 0.9rem;
            color: #FCF9F5;
            cursor: pointer;
            transition: all 0.2s cubic-bezier(0.2, 0.9, 0.4, 1.1);
            text-decoration: none;
            display: inline-block;
        }

        .btn-solid:hover {
            background: #C04F2C;
            transform: translateY(-2px);
        }

        .dashboard-link {
            background: #C04F2C;
            color: white;
            border: none;
            padding: 8px 24px;
            border-radius: 40px;
            font-weight: 500;
            text-decoration: none;
            transition: 0.2s;
        }

        .dashboard-link:hover {
            background: #9A3C1E;
            transform: scale(0.98);
        }

        /* 主视觉区域 — 强烈不对称 + 错落模块 */
        .hero {
            display: grid;
            grid-template-columns: 1fr 0.9fr;
            gap: 64px;
            margin: 64px 0 80px;
            align-items: start;
        }

        .hero-left {
            padding-top: 20px;
        }

        .badge-helper {
            background: #EADFCB;
            display: inline-block;
            padding: 6px 14px;
            font-size: 0.75rem;
            border-radius: 60px;
            color: #7C5F42;
            margin-bottom: 24px;
            letter-spacing: 0.3px;
        }

        .hero-title {
            font-size: 3.8rem;
            font-weight: 800;
            line-height: 1.15;
            letter-spacing: -0.02em;
            color: #2B2A27;
            margin-bottom: 24px;
        }

        .hero-title span {
            background: linear-gradient(135deg, #C86A43, #A04424);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
        }

        .hero-desc {
            font-size: 1.2rem;
            line-height: 1.5;
            color: #5C5348;
            margin-bottom: 40px;
            border-left: 3px solid #D9B48B;
            padding-left: 24px;
            max-width: 90%;
        }

        .cta-group {
            display: flex;
            gap: 18px;
            flex-wrap: wrap;
        }

        .btn-primary {
            background: #C04F2C;
            border: none;
            padding: 14px 32px;
            font-weight: 600;
            font-size: 1rem;
            color: white;
            border-radius: 60px;
            cursor: pointer;
            transition: all 0.25s ease;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 12px;
            box-shadow: 0 4px 8px rgba(0,0,0,0.05);
        }

        .btn-primary i {
            font-size: 0.9rem;
        }

        .btn-primary:hover {
            background: #963D1D;
            transform: translateX(4px);
            box-shadow: 0 8px 18px rgba(192,79,44,0.2);
        }

        .btn-secondary {
            background: transparent;
            border: 1.5px solid #BCA484;
            padding: 12px 28px;
            font-weight: 500;
            border-radius: 60px;
            color: #4C3928;
            transition: 0.2s;
            text-decoration: none;
        }

        .btn-secondary:hover {
            background: #EDE3D8;
            border-color: #9B7656;
        }

        /* 右侧插图区域 — 不对称裁切 + 真实图片占位（Picsum + 风格） */
        .hero-right {
            position: relative;
            background: #EADCCE;
            border-radius: 42% 58% 70% 30% / 42% 46% 54% 58%;
            overflow: hidden;
            aspect-ratio: 4 / 3;
            box-shadow: 18px 22px 34px -16px rgba(0,0,0,0.2);
            transition: all 0.3s;
        }

        .hero-right img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.92;
            mix-blend-mode: multiply;
        }

        /* 数据分析亮点 - 不对称卡片栏 (不等高/不等宽) */
        .stats-showcase {
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            margin: 60px 0 80px;
            align-items: stretch;
        }

        .stat-card {
            background: #FEFAF5;
            padding: 28px 32px;
            border-radius: 28px;
            box-shadow: 0 5px 12px rgba(0,0,0,0.03);
            flex: 1;
            min-width: 200px;
            transition: all 0.25s;
            border: 1px solid #F0E4D8;
        }

        /* 非对称——第一张宽一些，第三张略高 */
        .stat-card:first-child {
            flex: 1.4;
            background: #FFFFFFE6;
        }
        .stat-card:nth-child(2) {
            flex: 1;
            transform: translateY(12px);
        }
        .stat-card:last-child {
            flex: 0.9;
            background: #F7F0E7;
            border-bottom: 6px solid #D9B48B;
        }

        .stat-icon {
            font-size: 2rem;
            color: #C4734F;
            margin-bottom: 20px;
        }

        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: #2E2A26;
            margin-bottom: 12px;
            letter-spacing: -0.01em;
        }

        .stat-label {
            font-size: 0.9rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: #A28567;
            font-weight: 600;
        }

        .stat-desc {
            margin-top: 16px;
            font-size: 0.9rem;
            color: #6C5B4B;
        }

        /* 功能预览区 —— 非等宽网格，错落有致，避开三卡片 */
        .feature-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.9fr 1.1fr;
            gap: 32px;
            margin: 70px 0;
        }

        .feature-item {
            background: #FFFFFFCC;
            backdrop-filter: blur(2px);
            border-radius: 36px;
            padding: 36px 24px;
            transition: 0.2s;
            border: 1px solid #EBDFD3;
            box-shadow: 0 8px 20px rgba(0,0,0,0.02);
        }

        .feature-item:nth-child(2) {
            transform: translateY(20px);
            background: #FCF6EF;
        }

        .feature-item:last-child {
            transform: translateX(-12px);
        }

        .feature-icon {
            font-size: 2.4rem;
            color: #C37953;
            margin-bottom: 28px;
        }

        .feature-item h3 {
            font-size: 1.6rem;
            font-weight: 650;
            margin-bottom: 16px;
            color: #413A33;
        }

        .feature-item p {
            color: #6A5E51;
            line-height: 1.45;
        }

        /* 教师故事/ testimonials 不对称双栏 */
        .teacher-zone {
            display: flex;
            flex-wrap: wrap;
            gap: 50px;
            margin: 80px 0;
            background: #EADDCB;
            border-radius: 64px 24px 64px 24px;
            padding: 48px 56px;
        }

        .quote-block {
            flex: 1.2;
        }

        .quote-block i {
            font-size: 3rem;
            color: #B88F6E;
            opacity: 0.6;
        }

        .quote-text {
            font-size: 1.5rem;
            font-weight: 450;
            line-height: 1.4;
            margin: 20px 0 20px;
            color: #2F2A25;
        }

        .teacher-name {
            font-weight: 700;
            color: #A55230;
        }

        .teacher-meta {
            font-size: 0.85rem;
            color: #896E51;
        }

        .illustration-block {
            flex: 0.9;
            background: url('https://picsum.photos/id/276/500/380?grayscale') no-repeat center/cover;
            border-radius: 38px;
            min-height: 220px;
            filter: sepia(0.15);
        }
        .footer {
            margin-top: 80px;
            padding: 56px 0 48px;
            border-top: 2px solid #DDCFC0;
            background: #F7F2EA;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 40px;
        }

        .footer-col:first-child {
            flex: 1.6;
        }
        .footer-col {
            flex: 1;
        }
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: #C04F2C;
            margin-bottom: 12px;
        }
        .footer-desc {
            color: #7F6A54;
            max-width: 260px;
            font-size: 0.85rem;
            line-height: 1.4;
        }
        .footer-col h4 {
            font-weight: 600;
            margin-bottom: 18px;
            color: #4B3827;
            font-size: 1rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            text-decoration: none;
            color: #8B735C;
            transition: 0.2s;
            font-size: 0.9rem;
        }
        .footer-links a:hover {
            color: #C04F2C;
            padding-left: 4px;
        }
        .social-icons {
            display: flex;
            gap: 18px;
            margin-top: 20px;
        }
        .social-icons a {
            color: #A7876A;
            font-size: 1.25rem;
            transition: 0.2s;
        }
        .social-icons a:hover {
            color: #C04F2C;
        }
a {
text-decoration: none;
color: inherit;
}

@media (max-width: 700px) {
.logo {
    font-size: 1.5rem;
}
.navbar {
    padding: 10px;
}
.container {
        padding: 0 16px;
}
.hero {
    margin: 16px 10px;
    display: block;
}
    .hero-title {
        font-size: 1.7rem;
    }
.hero-desc {
    font-size: 0.9rem;
    line-height: 1.3;
}
.btn-primary {
    padding: 12px 22px;
    font-weight: 400;
}
.btn-secondary {
    padding: 10px 22px;
    font-weight: 400;
}
.stat-card {
    padding: 20px 22px;
}
.stat-icon {
    font-size: 1.7rem;
    margin-bottom: 0px;
}
.stat-number {
    font-size: 2rem;
    margin-bottom: 2px;
}
.stat-desc {
    margin-top: 8px;
    font-size: 0.9rem;
    color: #6C5B4B;
}
.feature-icon {
    font-size: 2rem;
    margin-bottom: 2px;
}
.feature-item h3 {
    font-size: 1.3rem;
    margin-bottom: 8px;
}
.feature-item p {
    font-size: 13px;
}
.teacher-zone {
    margin: 30px 0;
    padding: 10px 26px;
}
.quote-block i {
    font-size: 2rem;
}
.quote-text {
    font-size: 1rem;
    font-weight: 520;
    margin: 10px 0 10px;
    text-indent: 2em;
}
.footer {
    margin-top: 10px;
    padding: 56px 0 48px;
    border-top: 2px solid #DDCFC0;
    background: #F7F2EA;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 40px;
    flex-direction: column;
}
.feature-grid {
    display: flex;
    gap: 32px;
    flex-direction: column;
}
}