/* roulang page: index */
:root {
            --brand-blue: #1565C0;
            --brand-blue-dark: #0D47A1;
            --brand-orange: #FF6D00;
            --brand-orange-dark: #E65100;
            --surface: #F4F7FB;
            --text-primary: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border-light: #E2E8F0;
            --success: #10B981;
            --footer-bg: #F8FAFC;
            --footer-text: #94A3B8;
            --radius-card: 12px;
            --radius-img: 8px;
            --shadow-card: 0 4px 14px rgba(0, 0, 0, 0.06);
            --shadow-card-hover: 0 6px 20px rgba(0, 0, 0, 0.1);
            --transition-smooth: 0.25s ease;
            --container-max: 1280px;
            --section-gap: 120px;
            --section-gap-mobile: 80px;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
            text-size-adjust: 100%;
        }

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'WenQuanYi Micro Hei', sans-serif;
            font-size: 16px;
            line-height: 1.75;
            color: var(--text-body);
            background-color: #FFFFFF;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-smooth);
        }
        a:hover {
            color: var(--brand-blue);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
        }
        button {
            cursor: pointer;
        }

        .container {
            max-width: var(--container-max);
            margin-left: auto;
            margin-right: auto;
            padding-left: 32px;
            padding-right: 32px;
        }
        @media (max-width: 768px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
        }

        .section {
            padding-top: var(--section-gap);
            padding-bottom: var(--section-gap);
        }
        @media (max-width: 768px) {
            .section {
                padding-top: var(--section-gap-mobile);
                padding-bottom: var(--section-gap-mobile);
            }
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-weight: 600;
            font-size: 16px;
            letter-spacing: 0.5px;
            padding: 14px 32px;
            border-radius: 8px;
            transition: all var(--transition-smooth);
            white-space: nowrap;
            touch-action: manipulation;
            min-height: 48px;
            min-width: 48px;
        }
        .btn-primary {
            background-color: var(--brand-blue);
            color: #FFFFFF;
            box-shadow: 0 2px 8px rgba(21, 101, 192, 0.25);
        }
        .btn-primary:hover {
            background-color: var(--brand-blue-dark);
            box-shadow: 0 4px 16px rgba(21, 101, 192, 0.35);
            color: #FFFFFF;
        }
        .btn-primary:focus-visible {
            outline: 2px solid var(--brand-blue);
            outline-offset: 2px;
            box-shadow: 0 0 0 4px rgba(21, 101, 192, 0.2);
        }
        .btn-primary:active {
            transform: scale(0.98);
        }
        .btn-accent {
            background-color: var(--brand-orange);
            color: #FFFFFF;
            box-shadow: 0 2px 8px rgba(255, 109, 0, 0.3);
        }
        .btn-accent:hover {
            background-color: var(--brand-orange-dark);
            box-shadow: 0 4px 16px rgba(255, 109, 0, 0.4);
            color: #FFFFFF;
        }
        .btn-accent:focus-visible {
            outline: 2px solid var(--brand-orange);
            outline-offset: 2px;
            box-shadow: 0 0 0 4px rgba(255, 109, 0, 0.2);
        }
        .btn-accent:active {
            transform: scale(0.98);
        }

        .card {
            background: #FFFFFF;
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 32px;
            transition: all var(--transition-smooth);
            border: 1px solid var(--border-light);
        }
        .card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }

        /* Header / Navigation */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: #FFFFFF;
            border-bottom: 1px solid var(--border-light);
            height: 64px;
            display: flex;
            align-items: center;
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 22px;
            font-weight: 700;
            color: var(--text-primary);
            white-space: nowrap;
            flex-shrink: 0;
        }
        .logo .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 28px;
            height: 28px;
            flex-shrink: 0;
        }
        .logo .logo-icon svg {
            width: 20px;
            height: 20px;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 28px;
            list-style: none;
        }
        .nav-links a {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-body);
            padding: 6px 0;
            position: relative;
            transition: color var(--transition-smooth);
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--brand-blue);
        }
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            right: 0;
            height: 2px;
            background: var(--brand-orange);
            border-radius: 2px;
            transform: scaleX(0);
            transition: transform var(--transition-smooth);
        }
        .nav-links a:hover::after,
        .nav-links a.active::after {
            transform: scaleX(1);
        }
        .nav-cta-btn {
            background: var(--brand-orange);
            color: #FFFFFF !important;
            padding: 8px 20px !important;
            border-radius: 6px;
            font-weight: 600;
            font-size: 14px;
            transition: all var(--transition-smooth);
        }
        .nav-cta-btn:hover {
            background: var(--brand-orange-dark);
        }
        .nav-cta-btn::after {
            display: none !important;
        }

        /* Hamburger */
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            cursor: pointer;
            z-index: 1100;
            background: none;
            border: none;
            min-width: 44px;
            min-height: 44px;
            align-items: center;
            justify-content: center;
        }
        .hamburger span {
            display: block;
            width: 24px;
            height: 2.5px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: all 0.3s ease;
        }
        .hamburger.active span:nth-child(1) {
            transform: translateY(7.5px) rotate(45deg);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: translateY(-7.5px) rotate(-45deg);
        }

        /* Mobile Menu Overlay */
        .mobile-menu-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 1050;
            opacity: 0;
            transition: opacity 0.3s ease;
        }
        .mobile-menu-overlay.active {
            display: block;
            opacity: 1;
        }
        .mobile-menu-panel {
            position: fixed;
            top: 0;
            right: -320px;
            width: 300px;
            max-width: 85vw;
            height: 100vh;
            background: #FFFFFF;
            z-index: 1060;
            padding: 24px;
            display: flex;
            flex-direction: column;
            gap: 8px;
            transition: right 0.35s ease;
            box-shadow: -4px 0 24px rgba(0, 0, 0, 0.12);
            overflow-y: auto;
        }
        .mobile-menu-panel.active {
            right: 0;
        }
        .mobile-menu-panel a {
            display: block;
            font-size: 18px;
            font-weight: 600;
            color: var(--text-primary);
            padding: 14px 12px;
            border-radius: 8px;
            transition: all var(--transition-smooth);
        }
        .mobile-menu-panel a:hover {
            background: var(--surface);
            color: var(--brand-blue);
        }
        .mobile-menu-panel .mobile-cta {
            background: var(--brand-orange);
            color: #FFFFFF;
            text-align: center;
            margin-top: 16px;
            border-radius: 8px;
            padding: 14px;
            font-weight: 600;
        }
        .mobile-menu-close {
            align-self: flex-end;
            font-size: 28px;
            padding: 8px;
            cursor: pointer;
            min-width: 44px;
            min-height: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: none;
            border: none;
            color: var(--text-primary);
            line-height: 1;
        }

        @media (max-width: 1023px) {
            .nav-links {
                display: none;
            }
            .hamburger {
                display: flex;
            }
        }
        @media (min-width: 1024px) {
            .mobile-menu-overlay,
            .mobile-menu-panel {
                display: none !important;
            }
            .mobile-menu-overlay.active,
            .mobile-menu-panel.active {
                display: none !important;
            }
        }

        /* Hero */
        #hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            position: relative;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            margin-top: 0;
            padding-top: 64px;
        }
        #hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(135deg, rgba(21, 101, 192, 0.35) 0%, rgba(255, 255, 255, 0.85) 70%);
            z-index: 1;
        }
        #hero .container {
            position: relative;
            z-index: 2;
            display: flex;
            align-items: center;
            gap: 48px;
            flex-wrap: wrap;
            padding-top: 40px;
            padding-bottom: 40px;
        }
        .hero-content {
            flex: 1;
            min-width: 300px;
            max-width: 600px;
        }
        .hero-badge {
            display: inline-block;
            background: rgba(255, 255, 255, 0.85);
            border: 1px solid var(--border-light);
            border-radius: 20px;
            padding: 6px 16px;
            font-size: 13px;
            font-weight: 600;
            color: var(--brand-blue);
            margin-bottom: 20px;
            letter-spacing: 0.3px;
        }
        .hero-content h1 {
            font-size: 44px;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.25;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }
        .hero-content .hero-subtitle {
            font-size: 18px;
            color: var(--text-muted);
            margin-bottom: 36px;
            line-height: 1.7;
        }
        .hero-visual-card {
            flex: 0 0 340px;
            max-width: 380px;
            min-width: 280px;
            background: rgba(255, 255, 255, 0.92);
            border-radius: var(--radius-card);
            padding: 28px;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-light);
            backdrop-filter: blur(4px);
            -webkit-backdrop-filter: blur(4px);
        }
        .hero-visual-card .data-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 10px 0;
            border-bottom: 1px solid var(--border-light);
            font-size: 14px;
            color: var(--text-body);
        }
        .hero-visual-card .data-row:last-child {
            border-bottom: none;
        }
        .hero-visual-card .data-value {
            font-weight: 700;
            color: var(--brand-blue);
            font-size: 18px;
        }
        .hero-visual-card .data-dot {
            display: inline-block;
            width: 8px;
            height: 8px;
            border-radius: 50%;
            margin-right: 6px;
            animation: pulse-dot 1.8s ease-in-out infinite;
        }
        .hero-visual-card .data-dot.green {
            background: var(--success);
            animation-delay: 0s;
        }
        .hero-visual-card .data-dot.orange {
            background: var(--brand-orange);
            animation-delay: 0.6s;
        }
        .hero-visual-card .data-dot.blue {
            background: var(--brand-blue);
            animation-delay: 1.2s;
        }
        @keyframes pulse-dot {
            0%,
            100% {
                opacity: 1;
            }
            50% {
                opacity: 0.35;
            }
        }
        @media (max-width: 768px) {
            .hero-content h1 {
                font-size: 32px;
            }
            .hero-content .hero-subtitle {
                font-size: 16px;
            }
            #hero .container {
                flex-direction: column;
                gap: 32px;
            }
            .hero-visual-card {
                flex: 1 1 auto;
                max-width: 100%;
                width: 100%;
            }
        }

        /* Problem Section */
        #problem {
            background: #FFFFFF;
        }
        .section-label {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            color: var(--brand-orange);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 12px;
        }
        .section-title {
            font-size: 36px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 16px;
            line-height: 1.3;
        }
        .section-desc {
            font-size: 16px;
            color: var(--text-muted);
            max-width: 600px;
            margin-bottom: 48px;
            line-height: 1.75;
        }
        .problem-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }
        .problem-item {
            display: flex;
            gap: 16px;
            align-items: flex-start;
            padding: 24px;
            background: var(--surface);
            border-radius: var(--radius-card);
            border: 1px solid transparent;
            transition: all var(--transition-smooth);
        }
        .problem-item:hover {
            border-color: var(--border-light);
            box-shadow: var(--shadow-card);
        }
        .problem-icon {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: #FFFFFF;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: var(--brand-orange);
            border: 2px solid #FDE8D0;
            font-weight: 700;
        }
        .problem-item h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 6px;
        }
        .problem-item p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* Solution Section */
        #solution {
            background: #FFFFFF;
        }
        .solution-card {
            display: flex;
            gap: 32px;
            align-items: center;
            background: #FFFFFF;
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-light);
            padding: 0;
            overflow: hidden;
            margin-bottom: 32px;
            transition: all var(--transition-smooth);
        }
        .solution-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }
        .solution-card.reverse {
            flex-direction: row-reverse;
        }
        .solution-card .solution-img {
            flex: 0 0 40%;
            min-width: 280px;
            overflow: hidden;
            border-radius: 0;
            align-self: stretch;
        }
        .solution-card .solution-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
            border-radius: 0;
        }
        .solution-card .solution-text {
            flex: 1;
            padding: 32px 32px 32px 0;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .solution-card.reverse .solution-text {
            padding: 32px 0 32px 32px;
        }
        .solution-card .solution-text h3 {
            font-size: 22px;
            font-weight: 600;
            color: var(--text-primary);
        }
        .solution-card .solution-text p {
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.7;
        }
        .solution-card .solution-text .solution-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-weight: 600;
            color: var(--brand-blue);
            font-size: 15px;
            transition: all var(--transition-smooth);
            align-self: flex-start;
        }
        .solution-card .solution-text .solution-link:hover {
            color: var(--brand-blue-dark);
            gap: 10px;
        }
        .solution-card .solution-text .solution-link .arrow {
            transition: transform var(--transition-smooth);
            font-size: 18px;
        }
        .solution-card .solution-text .solution-link:hover .arrow {
            transform: translateX(4px);
        }
        .solution-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .solution-tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 500;
            color: var(--brand-blue);
            background: #E8F0FB;
            border-radius: 20px;
            padding: 4px 12px;
            white-space: nowrap;
        }
        @media (max-width: 768px) {
            .solution-card,
            .solution-card.reverse {
                flex-direction: column;
            }
            .solution-card .solution-img {
                flex: 0 0 auto;
                min-width: 100%;
                max-height: 220px;
                width: 100%;
            }
            .solution-card .solution-img img {
                width: 100%;
                height: 220px;
                object-fit: cover;
            }
            .solution-card .solution-text,
            .solution-card.reverse .solution-text {
                padding: 24px;
            }
            .section-title {
                font-size: 26px;
            }
        }

        /* Results Section */
        #results {
            background: var(--surface);
        }
        .results-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 28px;
        }
        .result-item {
            text-align: center;
            padding: 28px 20px;
            background: #FFFFFF;
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-light);
            transition: all var(--transition-smooth);
        }
        .result-item:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-card-hover);
        }
        .result-number {
            font-size: 52px;
            font-weight: 700;
            color: var(--brand-orange);
            line-height: 1.1;
            letter-spacing: -1px;
        }
        .result-unit {
            font-size: 20px;
            font-weight: 600;
            color: var(--brand-orange);
            margin-left: 2px;
        }
        .result-label {
            font-size: 14px;
            font-weight: 500;
            color: var(--text-muted);
            margin-top: 8px;
        }
        @media (max-width: 768px) {
            .result-number {
                font-size: 40px;
            }
            .results-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
        }
        @media (max-width: 480px) {
            .results-grid {
                grid-template-columns: 1fr;
            }
        }

        /* Testimonials */
        #testimonials {
            background: #FFFFFF;
        }
        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 24px;
        }
        .testimonial-card {
            background: #FFFFFF;
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            border-left: 4px solid var(--brand-orange);
            padding: 28px;
            transition: all var(--transition-smooth);
            position: relative;
        }
        .testimonial-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }
        .testimonial-card .testimonial-quote {
            font-size: 15px;
            color: var(--text-body);
            line-height: 1.8;
            font-style: italic;
            margin-bottom: 20px;
            position: relative;
            padding-left: 16px;
            border-left: 3px solid var(--surface);
        }
        .testimonial-card .testimonial-author {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .testimonial-card .testimonial-avatar {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--brand-blue);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #FFFFFF;
            font-weight: 700;
            font-size: 18px;
            flex-shrink: 0;
        }
        .testimonial-card .testimonial-info .name {
            font-weight: 600;
            font-size: 15px;
            color: var(--text-primary);
        }
        .testimonial-card .testimonial-info .team {
            font-size: 13px;
            color: var(--text-muted);
        }
        .testimonial-badge {
            display: inline-block;
            font-size: 11px;
            font-weight: 600;
            color: #FFFFFF;
            background: var(--success);
            border-radius: 12px;
            padding: 4px 10px;
            margin-bottom: 8px;
            letter-spacing: 0.3px;
        }

        /* FAQ */
        #faq {
            background: var(--surface);
        }
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            border-bottom: 1px solid var(--border-light);
        }
        .faq-item:last-child {
            border-bottom: none;
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 18px 0;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            text-align: left;
            cursor: pointer;
            transition: all var(--transition-smooth);
            background: none;
            border: none;
            min-height: 48px;
        }
        .faq-question:hover {
            background: #F0F4FA;
            padding-left: 12px;
            border-radius: 6px;
        }
        .faq-dot {
            flex-shrink: 0;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--brand-orange);
            transition: all 0.3s ease;
        }
        .faq-item.active .faq-dot {
            border-radius: 2px;
            width: 16px;
            height: 3px;
            background: var(--brand-blue);
        }
        .faq-arrow {
            flex-shrink: 0;
            margin-left: auto;
            transition: transform 0.35s ease;
            font-size: 14px;
            color: var(--text-muted);
            display: flex;
            align-items: center;
        }
        .faq-item.active .faq-arrow {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 24px;
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.75;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px 24px;
        }

        /* CTA Content */
        #cta-content {
            background: linear-gradient(180deg, #E8F2FB 0%, #FFFFFF 100%);
        }
        .cta-inner {
            max-width: 700px;
            margin: 0 auto;
            text-align: center;
        }
        .cta-inner h2 {
            font-size: 34px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 12px;
            line-height: 1.3;
        }
        .cta-inner .cta-subtitle {
            font-size: 16px;
            color: var(--text-muted);
            margin-bottom: 36px;
        }
        .cta-form {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            justify-content: center;
        }
        .cta-form input {
            flex: 1;
            min-width: 180px;
            padding: 14px 16px;
            border: 1px solid #CBD5E1;
            border-radius: 8px;
            font-size: 15px;
            color: var(--text-primary);
            background: #FFFFFF;
            transition: all var(--transition-smooth);
            min-height: 48px;
        }
        .cta-form input::placeholder {
            color: #94A3B8;
            font-size: 14px;
        }
        .cta-form input:focus {
            border-color: var(--brand-blue);
            box-shadow: 0 0 0 3px rgba(21, 101, 192, 0.12);
            outline: none;
        }
        .cta-form .btn-accent {
            flex: 0 0 auto;
            min-width: 200px;
            padding: 14px 28px;
            font-size: 16px;
            font-weight: 600;
            letter-spacing: 0.5px;
            white-space: nowrap;
        }
        @media (max-width: 640px) {
            .cta-form {
                flex-direction: column;
            }
            .cta-form input {
                min-width: 100%;
            }
            .cta-form .btn-accent {
                min-width: 100%;
            }
            .cta-inner h2 {
                font-size: 26px;
            }
        }

        /* Footer */
        .site-footer {
            background: var(--footer-bg);
            padding: 36px 0;
            text-align: center;
        }
        .site-footer .footer-row {
            margin-bottom: 8px;
        }
        .site-footer .footer-row:last-child {
            margin-bottom: 0;
        }
        .site-footer p {
            font-size: 14px;
            color: var(--footer-text);
            margin: 0;
        }
        .site-footer a {
            color: var(--brand-blue);
            font-weight: 500;
            transition: color var(--transition-smooth);
        }
        .site-footer a:hover {
            color: var(--brand-blue-dark);
        }
        .social-icons {
            display: flex;
            gap: 16px;
            justify-content: center;
            align-items: center;
            margin-top: 4px;
        }
        .social-icons a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: #FFFFFF;
            border: 1px solid var(--border-light);
            color: var(--text-muted);
            transition: all var(--transition-smooth);
        }
        .social-icons a:hover {
            background: var(--brand-blue);
            border-color: var(--brand-blue);
            color: #FFFFFF;
        }
        .social-icons svg {
            width: 16px;
            height: 16px;
        }

        /* Smooth scroll offset for fixed header */
        section[id] {
            scroll-margin-top: 80px;
        }
        @media (max-width: 768px) {
            section[id] {
                scroll-margin-top: 70px;
            }
        }

        /* Focus visible for accessibility */
        :focus-visible {
            outline: 2px solid var(--brand-blue);
            outline-offset: 2px;
        }