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

        body {
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            background: #f8fafc;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        /* Footer styles only - no extra content */
        .site-footer {
            background-color: #0f172a;
            color: #e2e8f0;
            width: 100%;
            border-top: 1px solid #1e293b;
            margin-top: auto;
            overflow-x: hidden;
        }

        .footer-container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 3rem 2rem 1.5rem;
            width: 100%;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 2rem;
            padding-bottom: 2rem;
            border-bottom: 1px solid #1e293b;
            margin-bottom: 1.5rem;
        }

        .footer-logo-section {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        .logo-wrapper {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            flex-wrap: wrap;
        }

        .logo-icon {
            background: linear-gradient(145deg, #3b82f6, #2563eb);
            width: 44px;
            height: 44px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            box-shadow: 0 8px 16px -4px rgba(59,130,246,0.25);
            transition: transform 0.2s ease;
        }

        .logo-icon:hover {
            transform: scale(1.02);
        }

        .logo-text {
            font-size: 1.7rem;
            font-weight: 700;
            letter-spacing: -0.3px;
            background: linear-gradient(120deg, #ffffff, #a5f3fc);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
        }

        .company-tagline {
            color: #94a3b8;
            font-size: 0.9rem;
            line-height: 1.5;
            max-width: 240px;
            margin-top: 0.25rem;
            word-break: break-word;
        }

        /* 邮箱可点击样式 */
        .copy-email {
            cursor: pointer;
            display: inline-flex;
            align-items: center;
            gap: 4px;
            transition: color 0.2s ease;
            color: #94a3b8;
            text-decoration: none;
        }
        .copy-email:hover {
            color: #ffffff;
            text-shadow: 0 0 2px rgba(255,255,255,0.2);
        }
        /* 复制成功提示小工具 */
        .copy-tooltip {
            position: fixed;
            bottom: 20px;
            left: 50%;
            transform: translateX(-50%);
            background: #1e293b;
            color: white;
            padding: 6px 12px;
            border-radius: 30px;
            font-size: 0.75rem;
            z-index: 2000;
            opacity: 0;
            transition: opacity 0.2s;
            pointer-events: none;
            white-space: nowrap;
        }

        .nav-group {
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }

        .nav-group h4 {
            color: #f1f5f9;
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 0.25rem;
            letter-spacing: -0.2px;
            position: relative;
            display: inline-block;
        }

        .nav-group h4:after {
            content: '';
            position: absolute;
            bottom: -6px;
            left: 0;
            width: 28px;
            height: 2px;
            background: #3b82f6;
            border-radius: 2px;
        }

        .nav-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 0.6rem;
        }

        .nav-links li a {
            color: #cbd5e1;
            text-decoration: none;
            font-size: 0.9rem;
            transition: all 0.2s ease;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .nav-links li a:hover {
            color: #ffffff;
            transform: translateX(4px);
            text-shadow: 0 0 2px rgba(255,255,255,0.2);
        }

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
            font-size: 0.85rem;
            color: #94a3b8;
            padding-top: 0.5rem;
        }

        .copyright {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }

        .legal-links {
            display: flex;
            gap: 1.5rem;
            flex-wrap: wrap;
        }

        .legal-links a {
            color: #94a3b8;
            text-decoration: none;
            transition: color 0.2s;
            font-size: 0.85rem;
        }

        .legal-links a:hover {
            color: #f1f5f9;
        }

        /* ========= 响应式调整 ========= */
        @media (max-width: 900px) {
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 2rem 1.5rem;
            }
            .footer-logo-section {
                grid-column: span 2;
                align-items: center;
                text-align: center;
            }
            .logo-wrapper {
                justify-content: center;
            }
            .company-tagline {
                max-width: 100%;
                text-align: center;
            }
            .nav-group {
                align-items: center;
                text-align: center;
            }
            .nav-group h4:after {
                left: 50%;
                transform: translateX(-50%);
                width: 40px;
            }
            .nav-links li a:hover {
                transform: translateX(0);
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .legal-links {
                justify-content: center;
            }
        }

        @media (max-width: 768px) {
            .footer-container {
                padding: 2rem 1.25rem 1.2rem;
            }
            .footer-grid {
                gap: 1.8rem;
            }
            .logo-text {
                font-size: 1.5rem;
            }
            .logo-wrapper img {
                height: 38px !important;
                width: auto;
                max-width: 100%;
            }
            .company-tagline {
                font-size: 0.85rem;
            }
            .nav-group h4 {
                font-size: 1rem;
            }
            .nav-links li a {
                font-size: 0.85rem;
            }
        }

        @media (max-width: 550px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            .footer-logo-section {
                grid-column: span 1;
            }
            .footer-container {
                padding: 1.8rem 1rem 1rem;
                overflow-x: hidden;
            }
            .logo-text {
                font-size: 1.4rem;
            }
            .logo-wrapper img {
                height: 34px !important;
            }
            .company-tagline {
                font-size: 0.8rem;
                text-align: center;
            }
            .nav-group {
                align-items: flex-start;
                text-align: left;
                width: 100%;
            }
            .nav-group h4:after {
                left: 0;
                transform: none;
                width: 32px;
            }
            .nav-links {
                width: 100%;
            }
            .nav-links li a {
                font-size: 0.85rem;
                word-break: break-word;
                white-space: normal;
            }
            .footer-bottom {
                gap: 0.8rem;
            }
            .legal-links {
                justify-content: center;
                gap: 0.8rem;
            }
            .legal-links a {
                font-size: 0.75rem;
                white-space: normal;
            }
            .copyright {
                flex-direction: column;
                gap: 4px;
                font-size: 0.75rem;
                text-align: center;
            }
        }

        @media (max-width: 380px) {
            .footer-container {
                padding: 1.5rem 0.8rem 1rem;
            }
            .logo-text {
                font-size: 1.2rem;
            }
            .logo-wrapper img {
                height: 30px !important;
            }
            .nav-links li a {
                font-size: 0.8rem;
            }
        }

        .nav-links li a,
        .legal-links a {
            touch-action: manipulation;
        }

        a:focus-visible, 
        .logo-wrapper:focus-visible {
            outline: 2px solid #3b82f6;
            outline-offset: 4px;
            border-radius: 6px;
        }
        .nav-links li a:active {
            opacity: 0.7;
        }
        html {
            scroll-behavior: smooth;
        }
        
        img, iframe, video, .footer-container, .footer-grid, .nav-group {
            max-width: 100%;
        }