:root {
            --bg: #fdfcf8;
            --bg-card: #ffffff;
            --text: #0f1c11;
            --text-secondary: #4a634d;
            --text-muted: #6b7f6e;
            --border: #d1e2d4;
            --border-light: #e8f3e9;
            --primary: #2d4a33;
            --primary-hover: #1e3323;
            --radius: 38px;
            --radius-md: 22px;
            --radius-sm: 14px;
            --shadow: 0 25px 50px -12px rgba(45, 74, 51, 0.15);
            --shadow-sm: 0 10px 30px -10px rgba(45, 74, 51, 0.1);
            --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
            background: var(--bg);
            color: var(--text);
            min-height: 100vh;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

        /* ===== 导航栏 ===== */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(253, 252, 248, 0.8);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
        }

        .nav-container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 1.5rem;
            height: 64px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            text-decoration: none;
            color: var(--primary);
            font-weight: 700;
            font-size: 1.5rem;
            letter-spacing: -0.02em;
        }

        .logo-img {
            height: 40px;
        }

        .logo-text {
            font-weight: 700;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 1.5rem;
        }

        .nav-link {
            text-decoration: none;
            color: var(--text-secondary);
            font-size: 0.875rem;
            font-weight: 600;
            transition: color 0.3s;
        }

        .nav-link:hover {
            color: var(--primary);
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .lang-btn {
            padding: 0.375rem 0.875rem;
            border-radius: 8px;
            font-size: 0.875rem;
            font-weight: 500;
            border: none;
            cursor: pointer;
            transition: var(--transition);
        }

        .lang-btn.active {
            background: var(--bg-card);
            color: var(--primary);
            box-shadow: 0 1px 3px rgba(0,0,0,0.08);
        }

        .lang-btn:not(.active) {
            background: transparent;
            color: var(--text-secondary);
        }

        .lang-btn:not(.active):hover {
            color: var(--primary);
        }

        /* ===== Hero 区域 ===== */
        .hero {
            min-height: 100vh;
            padding: 80px 1.5rem 80px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .hero-container {
            max-width: 1200px;
            width: 100%;
        }

        .hero-card {
            position: relative;
            overflow: hidden;
            border-radius: var(--radius);
            background: var(--bg-card);
            border: 1px solid var(--border);
            padding: 3rem 2rem;
            box-shadow: var(--shadow);
            -webkit-mask-image: -webkit-radial-gradient(white, black);
            mask-image: radial-gradient(white, black);
        }

        @media (min-width: 768px) {
            .hero-card {
                padding: 5rem 4rem;
            }
        }

        .hero-blur-1 {
            position: absolute;
            top: -80px;
            right: -80px;
            width: 384px;
            height: 384px;
            background: var(--border-light);
            border-radius: 50%;
            filter: blur(64px);
            opacity: 0.6;
            pointer-events: none;
        }

        .hero-blur-2 {
            position: absolute;
            bottom: -60px;
            left: -60px;
            width: 320px;
            height: 320px;
            background: var(--bg);
            border-radius: 50%;
            filter: blur(64px);
            opacity: 0.6;
            pointer-events: none;
        }

        .hero-inner {
            position: relative;
            z-index: 1;
            display: grid;
            grid-template-columns: 1fr;
            gap: 3rem;
            align-items: center;
        }

        @media (min-width: 1024px) {
            .hero-inner {
                grid-template-columns: 1fr 1fr;
                gap: 4rem;
            }
        }

        .hero-content {
            text-align: center;
        }

        @media (min-width: 1024px) {
            .hero-content {
                text-align: left;
            }
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.5rem 1rem;
            border-radius: 100px;
            background: var(--border-light);
            border: 1px solid var(--border);
            color: var(--primary);
            font-size: 0.875rem;
            font-weight: 700;
            margin-bottom: 2rem;
        }

        .hero-badge svg {
            width: 16px;
            height: 16px;
            flex-shrink: 0;
        }

        .hero-title {
            font-size: clamp(2.5rem, 5vw, 4rem);
            font-weight: 900;
            line-height: 1.05;
            letter-spacing: -0.03em;
            color: var(--text);
            margin-bottom: 1rem;
        }

        .hero-subtitle {
            font-size: clamp(1.1rem, 2vw, 1.5rem);
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 2rem;
            line-height: 1.5;
        }

        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 0.75rem;
            justify-content: center;
        }

        @media (min-width: 1024px) {
            .hero-actions {
                justify-content: flex-start;
            }
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.875rem 1.5rem;
            border-radius: var(--radius-sm);
            font-size: 1.5rem;
            font-weight: 800;
            text-decoration: none;
            transition: var(--transition);
            cursor: pointer;
            border: none;
        }

        .btn-primary {
            background: var(--primary);
            color: white;
            box-shadow: 0 10px 40px rgba(45, 74, 51, 0.2);
        }

        .btn-primary:hover {
            background: var(--primary-hover);
            transform: scale(1.05);
        }

        .btn-primary svg {
            width: 20px;
            height: 20px;
            flex-shrink: 0;
        }

        .btn-secondary {
            background: var(--bg-card);
            color: var(--primary);
            border: 2px solid var(--border);
        }

        .btn-secondary:hover {
            background: var(--bg);
            border-color: var(--primary);
            transform: scale(1.05);
        }

        /* Hero 图片 */
        .hero-visual {
            position: relative;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .hero-image-wrapper {
            position: relative;
            width: 100%;
            max-width: 560px;
        }

        .hero-image-wrapper::before {
            content: '';
            position: absolute;
            top: -20px;
            right: -20px;
            width: 100%;
            height: 100%;
            background: var(--border-light);
            border-radius: var(--radius-md);
            z-index: 0;
        }

        .hero-image {
            position: relative;
            z-index: 1;
            width: 100%;
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            display: block;
        }

        /* ===== 特性区域 ===== */
        .features {
            padding: 0 1.5rem 80px;
        }

        .features-grid {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(1, 1fr);
            gap: 1.5rem;
        }

        @media (min-width: 768px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (min-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        .feature-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 2rem;
            transition: var(--transition);
        }

        .feature-card:hover {
            box-shadow: var(--shadow-sm);
        }

        .feature-icon {
            width: 48px;
            height: 48px;
            border-radius: 16px;
            background: var(--border-light);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.25rem;
        }

        .feature-icon svg {
            width: 24px;
            height: 24px;
            color: var(--primary);
        }

        .feature-title {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 0.5rem;
        }

        .feature-desc {
            color: var(--text-secondary);
            line-height: 1.7;
            font-size: 0.95rem;
        }

        /* ===== 统计条 ===== */
        .stats {
            padding: 0 1.5rem 80px;
        }

        .stats-grid {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1rem;
        }

        @media (min-width: 640px) {
            .stats-grid {
                grid-template-columns: repeat(4, 1fr);
            }
        }

        .stat-card {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            padding: 1rem 1.25rem;
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
        }

        .stat-icon {
            width: 40px;
            height: 40px;
            border-radius: 12px;
            background: var(--border-light);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .stat-icon svg {
            width: 20px;
            height: 20px;
            color: var(--primary);
        }

        .stat-text {
            font-weight: 700;
            color: var(--text);
            font-size: 0.95rem;
        }

        /* ===== 关于区域 ===== */
        .about {
            padding: 0 1.5rem 80px;
        }

        .about-card {
            max-width: 1200px;
            margin: 0 auto;
            background: var(--text);
            border-radius: var(--radius);
            padding: 3rem 2rem;
            position: relative;
            overflow: hidden;
            -webkit-mask-image: -webkit-radial-gradient(white, black);
            mask-image: radial-gradient(white, black);
        }

        @media (min-width: 768px) {
            .about-card {
                padding: 5rem;
            }
        }

        .about-blur {
            position: absolute;
            top: 0;
            right: 0;
            width: 384px;
            height: 384px;
            background: var(--primary);
            border-radius: 50%;
            filter: blur(120px);
            opacity: 0.2;
            pointer-events: none;
        }

        .about-content {
            position: relative;
            z-index: 1;
            max-width: 700px;
        }

        .about-title {
            font-size: clamp(1.75rem, 4vw, 2.5rem);
            font-weight: 800;
            color: white;
            line-height: 1.2;
            margin-bottom: 1rem;
        }

        .about-desc {
            font-size: 1.1rem;
            color: rgba(255,255,255,0.7);
            line-height: 1.8;
            margin-bottom: 2rem;
        }

        .about-grid {
            display: grid;
            grid-template-columns: repeat(1, 1fr);
            gap: 1rem;
        }

        @media (min-width: 640px) {
            .about-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (min-width: 1024px) {
            .about-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        .about-item {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            padding: 1rem 1.25rem;
            background: rgba(255,255,255,0.05);
            border: 1px solid rgba(255,255,255,0.1);
            border-radius: var(--radius-sm);
            color: white;
            font-weight: 700;
            font-size: 1.1rem;
            transition: var(--transition);
        }

        .about-item:hover {
            background: rgba(255,255,255,0.1);
        }

        .about-item svg {
            width: 24px;
            height: 24px;
            color: var(--primary);
            flex-shrink: 0;
        }

        /* ===== CTA 区域 ===== */
        .cta {
            padding: 80px 1.5rem;
            text-align: center;
        }

        .cta-title {
            font-size: clamp(2rem, 5vw, 3.5rem);
            font-weight: 800;
            color: var(--text);
            line-height: 1.1;
            margin-bottom: 1rem;
        }

        .cta-desc {
            font-size: 1.1rem;
            color: var(--text-secondary);
            margin-bottom: 2rem;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }

        .cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 0.75rem;
            padding: 1.25rem 2.5rem;
            background: var(--primary);
            color: white;
            border-radius: var(--radius-sm);
            font-size: 1.25rem;
            font-weight: 700;
            text-decoration: none;
            box-shadow: 0 20px 50px rgba(45, 74, 51, 0.25);
            transition: var(--transition);
        }

        .cta-btn:hover {
            background: var(--primary-hover);
            transform: scale(1.05);
        }

        .cta-btn svg {
            width: 24px;
            height: 24px;
        }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--bg-card);
            border-top: 1px solid var(--border);
            padding: 3rem 1.5rem 2rem;
        }

        .footer-grid {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1fr;
            gap: 2.5rem;
        }

        @media (min-width: 768px) {
            .footer-grid {
                grid-template-columns: 2fr 1fr 1fr 1fr;
            }
        }

        .footer-brand {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 0.75rem;
        }

        .footer-brand-icon {
            font-size: 1.5rem;
        }

        .footer-desc {
            color: var(--text-secondary);
            font-size: 0.875rem;
            line-height: 1.7;
            max-width: 280px;
        }

        .footer-title {
            font-weight: 700;
            color: var(--text);
            margin-bottom: 1rem;
            font-size: 0.95rem;
        }

        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }

        .footer-links a {
            color: var(--text-secondary);
            text-decoration: none;
            font-size: 0.875rem;
            transition: color 0.3s;
        }

        .footer-links a:hover {
            color: var(--primary);
        }

        .footer-bottom {
            max-width: 1200px;
            margin:0 auto 0;
            text-align: center;
        }

        .footer-copy {
            color: var(--text-muted);
            font-size: 0.8rem;
        }

        .footer-email {
            color: var(--text-muted);
            font-size: 0.8rem;
            margin-top: 0.25rem;
        }

        /* ===== 动画 ===== */
        .animate-in {
            opacity: 0;
            transform: translateY(20px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }

        .animate-in.visible {
            opacity: 1;
            transform: translateY(0);
        }

        .animate-in-left {
            opacity: 0;
            transform: translateX(-20px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }

        .animate-in-left.visible {
            opacity: 1;
            transform: translateX(0);
        }

        .animate-in-right {
            opacity: 0;
            transform: translateX(20px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }

        .animate-in-right.visible {
            opacity: 1;
            transform: translateX(0);
        }

        /* 滚动条美化 */
        ::-webkit-scrollbar {
            width: 6px;
        }

        ::-webkit-scrollbar-track {
            background: var(--bg);
        }

        ::-webkit-scrollbar-thumb {
            background: var(--border);
            border-radius: 3px;
        }

        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-muted);
        }