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

    body {
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
        line-height: 1.6;
        color: #333;
        background: #f8f9fa;
    }

    .l7wf-header {
        background: #fff;
        box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        position: sticky;
        top: 0;
        z-index: 1000;
    }

    .l7wf-nav {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 20px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: 70px;
    }

    .l7wf-logo img {
        height: 40px;
        width: auto;
    }

    .l7wf-menu-toggle {
        display: none;
        flex-direction: column;
        background: none;
        border: none;
        cursor: pointer;
        padding: 5px;
    }

    .l7wf-menu-toggle span {
        width: 25px;
        height: 3px;
        background: #333;
        margin: 3px 0;
        transition: 0.3s;
    }

    .l7wf-nav-menu {
        display: flex;
        list-style: none;
        gap: 30px;
    }

    .l7wf-nav-menu a {
        text-decoration: none;
        color: #333;
        font-weight: 500;
        transition: color 0.3s;
    }

    .l7wf-nav-menu a:hover,
    .l7wf-nav-menu a.active {
        color: #4285f4;
    }

    .l7wf-nav-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0,0,0,0.5);
        z-index: 999;
    }

    .l7wf-translate-container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 40px 20px;
    }

    .l7wf-page-header {
        text-align: center;
        margin-bottom: 40px;
    }

    .l7wf-page-title {
        font-size: 2.5rem;
        font-weight: 700;
        color: #1a1a1a;
        margin-bottom: 15px;
    }

    .l7wf-page-subtitle {
        font-size: 1.2rem;
        color: #666;
        max-width: 600px;
        margin: 0 auto;
    }

    .l7wf-translator-wrapper {
        background: #fff;
        border-radius: 20px;
        box-shadow: 0 10px 40px rgba(0,0,0,0.1);
        overflow: hidden;
        margin-bottom: 60px;
    }

    .l7wf-language-selector {
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 30px;
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        color: white;
    }

    .l7wf-lang-select {
        background: rgba(255,255,255,0.2);
        border: 2px solid rgba(255,255,255,0.3);
        color: white;
        padding: 12px 20px;
        border-radius: 25px;
        font-size: 16px;
        cursor: pointer;
        transition: all 0.3s;
        min-width: 150px;
    }

    .l7wf-lang-select:hover {
        background: rgba(255,255,255,0.3);
        border-color: rgba(255,255,255,0.5);
    }

    .l7wf-lang-select option {
        background: #333;
        color: white;
    }

    .l7wf-swap-btn {
        background: rgba(255,255,255,0.2);
        border: 2px solid rgba(255,255,255,0.3);
        color: white;
        width: 50px;
        height: 50px;
        border-radius: 50%;
        margin: 0 20px;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 20px;
        transition: all 0.3s;
    }

    .l7wf-swap-btn:hover {
        background: rgba(255,255,255,0.3);
        transform: rotate(180deg);
    }

    .l7wf-translation-area {
        display: grid;
        grid-template-columns: 1fr 1fr;
        min-height: 400px;
    }

    .l7wf-input-section,
    .l7wf-output-section {
        padding: 30px;
        display: flex;
        flex-direction: column;
    }

    .l7wf-input-section {
        border-right: 1px solid #e9ecef;
    }

    .l7wf-section-label {
        font-size: 14px;
        font-weight: 600;
        color: #666;
        margin-bottom: 15px;
        text-transform: uppercase;
        letter-spacing: 1px;
    }

    .l7wf-text-input {
        flex: 1;
        border: none;
        outline: none;
        font-size: 18px;
        line-height: 1.6;
        resize: none;
        font-family: inherit;
        color: #333;
    }

    .l7wf-text-input::placeholder {
        color: #999;
    }

    .l7wf-text-output {
        flex: 1;
        font-size: 18px;
        line-height: 1.6;
        color: #333;
        background: #f8f9fa;
        padding: 20px;
        border-radius: 10px;
        min-height: 200px;
    }

    .l7wf-input-tools {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-top: 20px;
        padding-top: 20px;
        border-top: 1px solid #e9ecef;
    }

    .l7wf-tool-buttons {
        display: flex;
        gap: 15px;
    }

    .l7wf-tool-btn {
        background: none;
        border: 2px solid #e9ecef;
        color: #666;
        padding: 10px 15px;
        border-radius: 20px;
        cursor: pointer;
        font-size: 14px;
        transition: all 0.3s;
        display: flex;
        align-items: center;
        gap: 8px;
    }

    .l7wf-tool-btn:hover {
        border-color: #4285f4;
        color: #4285f4;
    }

    .l7wf-char-count {
        font-size: 14px;
        color: #999;
    }

    .l7wf-output-tools {
        display: flex;
        justify-content: flex-end;
        align-items: center;
        margin-top: 20px;
        padding-top: 20px;
        border-top: 1px solid #e9ecef;
    }

    .l7wf-copy-btn {
        background: #4285f4;
        color: white;
        border: none;
        padding: 12px 24px;
        border-radius: 25px;
        cursor: pointer;
        font-size: 14px;
        font-weight: 600;
        transition: all 0.3s;
        display: flex;
        align-items: center;
        gap: 8px;
    }

    .l7wf-copy-btn:hover {
        background: #3367d6;
        transform: translateY(-2px);
    }

    .l7wf-features-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 30px;
        margin-bottom: 60px;
    }

    .l7wf-feature-card {
        background: white;
        padding: 30px;
        border-radius: 15px;
        box-shadow: 0 5px 20px rgba(0,0,0,0.08);
        text-align: center;
        transition: transform 0.3s;
    }

    .l7wf-feature-card:hover {
        transform: translateY(-5px);
    }

    .l7wf-feature-icon {
        font-size: 3rem;
        margin-bottom: 20px;
    }

    .l7wf-feature-title {
        font-size: 1.3rem;
        font-weight: 600;
        color: #333;
        margin-bottom: 15px;
    }

    .l7wf-feature-desc {
        color: #666;
        line-height: 1.6;
    }

    .l7wf-stats-section {
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        color: white;
        padding: 60px 20px;
        text-align: center;
        margin-bottom: 60px;
        border-radius: 20px;
    }

    .l7wf-stats-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 40px;
        max-width: 800px;
        margin: 0 auto;
    }

    .l7wf-stat-item {
        text-align: center;
    }

    .l7wf-stat-number {
        font-size: 3rem;
        font-weight: 700;
        margin-bottom: 10px;
    }

    .l7wf-stat-label {
        font-size: 1.1rem;
        opacity: 0.9;
    }

    .l7wf-footer {
        background: #2c3e50;
        color: white;
        padding: 60px 20px 30px;
    }

    .l7wf-footer-content {
        max-width: 1200px;
        margin: 0 auto;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 40px;
        margin-bottom: 40px;
    }

    .l7wf-footer-section h3 {
        font-size: 1.2rem;
        margin-bottom: 20px;
        color: #ecf0f1;
    }

    .l7wf-footer-section ul {
        list-style: none;
    }

    .l7wf-footer-section ul li {
        margin-bottom: 10px;
    }

    .l7wf-footer-section ul li a {
        color: #bdc3c7;
        text-decoration: none;
        transition: color 0.3s;
    }

    .l7wf-footer-section ul li a:hover {
        color: #3498db;
    }

    .l7wf-footer-bottom {
        text-align: center;
        padding-top: 30px;
        border-top: 1px solid #34495e;
        color: #95a5a6;
    }

    @media (max-width: 768px) {
        .l7wf-menu-toggle {
            display: flex;
        }

        .l7wf-nav-menu {
            display: none;
            position: fixed;
            top: 70px;
            left: 0;
            width: 100%;
            background: white;
            flex-direction: column;
            padding: 20px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }

        .l7wf-nav-menu.active {
            display: flex;
        }

        .l7wf-page-title {
            font-size: 2rem;
        }

        .l7wf-language-selector {
            flex-direction: column;
            gap: 20px;
        }

        .l7wf-swap-btn {
            margin: 0;
            transform: rotate(90deg);
        }

        .l7wf-translation-area {
            grid-template-columns: 1fr;
        }

        .l7wf-input-section {
            border-right: none;
            border-bottom: 1px solid #e9ecef;
        }

        .l7wf-tool-buttons {
            flex-wrap: wrap;
        }

        .l7wf-stats-grid {
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }

        .l7wf-stat-number {
            font-size: 2rem;
        }
    }

    @media (max-width: 480px) {
        .l7wf-translate-container {
            padding: 20px 15px;
        }

        .l7wf-input-section,
        .l7wf-output-section {
            padding: 20px;
        }

        .l7wf-stats-grid {
            grid-template-columns: 1fr;
        }
    }