/* roulang page: index */
:root {
            --color-primary: #FF4400;
            --color-primary-hover: #E63E00;
            --color-primary-dark: #CC3300;
            --color-accent: #00F0FF;
            --color-accent-glow: rgba(0, 240, 255, 0.3);
            --color-accent-bg: rgba(0, 240, 255, 0.08);
            --bg-deep: #0D0D0D;
            --bg-card: #1A1A1A;
            --bg-card-light: #222222;
            --bg-footer: #111111;
            --border-subtle: #2A2A2A;
            --text-primary: #FFFFFF;
            --text-secondary: #B3B3B3;
            --text-body: #999999;
            --text-muted: #666666;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --shadow-glow: 0 0 15px rgba(0, 240, 255, 0.3);
            --shadow-glow-strong: 0 0 25px rgba(0, 240, 255, 0.5);
            --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.4);
            --shadow-elevate: 0 8px 32px rgba(0, 0, 0, 0.6);
            --space-unit: 8px;
            --nav-height: 64px;
            --section-padding: 100px;
            --transition-fast: 0.2s ease;
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
            scroll-padding-top: var(--nav-height);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", "Segoe UI", sans-serif;
            font-weight: 400;
            line-height: 1.7;
            color: var(--text-body);
            background-color: var(--bg-deep);
            min-height: 100vh;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-fast);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            outline: none;
        }

        button:focus-visible,
        a:focus-visible {
            outline: 2px solid var(--color-accent);
            outline-offset: 2px;
            border-radius: 4px;
        }

        ul {
            list-style: none;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ========== NAVIGATION ========== */
        #mainNav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--nav-height);
            background: rgba(13, 13, 13, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid transparent;
            transition: border-color var(--transition-smooth), background var(--transition-smooth);
        }

        #mainNav::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent 0%, var(--color-primary) 20%, var(--color-primary) 50%, var(--color-primary) 80%, transparent 100%);
            opacity: 0.7;
            transition: opacity var(--transition-smooth);
        }

        #mainNav.scrolled {
            background: rgba(13, 13, 13, 0.97);
            border-bottom-color: rgba(255, 68, 0, 0.15);
        }

        #mainNav .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.5rem;
            font-weight: 900;
            letter-spacing: -0.5px;
            color: var(--text-primary);
            text-decoration: none;
            transition: color var(--transition-fast);
            white-space: nowrap;
            transform: skewX(-4deg);
        }

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

        .nav-logo .logo-icon {
            width: 36px;
            height: 36px;
            flex-shrink: 0;
            transform: skewX(4deg);
        }

        .nav-logo .logo-text {
            transform: skewX(4deg);
            display: inline-block;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
        }

        .nav-links a {
            color: var(--text-secondary);
            font-size: 0.95rem;
            font-weight: 500;
            position: relative;
            padding: 6px 0;
            transition: color var(--transition-fast);
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%) scaleX(0);
            width: 100%;
            height: 2px;
            background: var(--color-primary);
            border-radius: 2px;
            transition: transform var(--transition-smooth);
            transform-origin: center;
        }

        .nav-links a:hover {
            color: var(--color-primary);
        }
        .nav-links a:hover::after,
        .nav-links a.active::after {
            transform: translateX(-50%) scaleX(1);
        }
        .nav-links a.active {
            color: var(--color-primary);
        }

        /* Hamburger */
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            z-index: 1001;
            background: none;
            border: none;
            padding: 8px 4px;
            width: 36px;
            height: 30px;
            justify-content: center;
            align-items: center;
        }

        .hamburger span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: all var(--transition-smooth);
            transform-origin: center;
        }

        .hamburger.active span:nth-child(1) {
            transform: translateY(7.5px) rotate(45deg);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
            transform: scaleX(0);
        }
        .hamburger.active span:nth-child(3) {
            transform: translateY(-7.5px) rotate(-45deg);
        }

        /* Mobile menu */
        .mobile-menu-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.85);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            z-index: 999;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 28px;
        }

        .mobile-menu-overlay.active {
            display: flex;
        }

        .mobile-menu-overlay a {
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--text-primary);
            transition: color var(--transition-fast);
            padding: 12px 24px;
        }
        .mobile-menu-overlay a:hover {
            color: var(--color-primary);
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
            .hamburger {
                display: flex;
            }
        }

        /* ========== HERO ========== */
        #hero {
            padding-top: calc(var(--nav-height) + 40px);
            padding-bottom: 80px;
            min-height: 100vh;
            display: flex;
            align-items: center;
            position: relative;
            overflow: hidden;
        }

        #hero::before {
            content: '';
            position: absolute;
            top: -30%;
            right: -15%;
            width: 700px;
            height: 700px;
            background: radial-gradient(circle, rgba(255, 68, 0, 0.06) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        #hero::after {
            content: '';
            position: absolute;
            bottom: -20%;
            left: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(0, 240, 255, 0.04) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
            position: relative;
            z-index: 1;
        }

        .hero-content {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }

        .hero-content h1 {
            font-size: clamp(2.5rem, 5vw, 4rem);
            font-weight: 800;
            color: var(--text-primary);
            line-height: 1.15;
            letter-spacing: -0.02em;
        }

        .hero-content h1 .highlight {
            color: var(--color-primary);
            position: relative;
            display: inline-block;
        }

        .hero-content .hero-subtitle {
            font-size: 1.15rem;
            color: var(--text-secondary);
            line-height: 1.6;
            max-width: 480px;
        }

        .hero-buttons {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            margin-top: 8px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 14px 28px;
            font-size: 1rem;
            font-weight: 700;
            border-radius: var(--radius-md);
            transition: all var(--transition-smooth);
            text-align: center;
            white-space: nowrap;
            letter-spacing: 0.02em;
            cursor: pointer;
        }

        .btn-primary {
            background: var(--color-primary);
            color: #FFFFFF;
            border: none;
            box-shadow: 0 4px 18px rgba(255, 68, 0, 0.35);
        }
        .btn-primary:hover {
            background: var(--color-primary-hover);
            box-shadow: 0 6px 24px rgba(255, 68, 0, 0.5);
            transform: translateY(-2px);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 10px rgba(255, 68, 0, 0.3);
        }

        .btn-secondary {
            background: transparent;
            color: var(--color-accent);
            border: 1.5px solid var(--color-accent);
            box-shadow: 0 0 0 transparent;
        }
        .btn-secondary:hover {
            background: var(--color-accent-bg);
            box-shadow: var(--shadow-glow);
            transform: translateY(-2px);
        }
        .btn-secondary:active {
            transform: translateY(0);
            box-shadow: 0 0 8px rgba(0, 240, 255, 0.2);
        }

        .btn-sm {
            padding: 10px 20px;
            font-size: 0.9rem;
        }

        .btn-lg {
            padding: 16px 36px;
            font-size: 1.1rem;
        }

        .hero-image-wrap {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            aspect-ratio: 4 / 3;
            box-shadow: var(--shadow-elevate);
        }

        .hero-image-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
        }

        .hero-image-wrap::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(13, 13, 13, 0.15) 0%, rgba(13, 13, 13, 0.35) 50%, rgba(13, 13, 13, 0.7) 100%);
            pointer-events: none;
        }

        .hero-image-wrap::before {
            content: '';
            position: absolute;
            inset: 0;
            border-radius: var(--radius-lg);
            border: 2px solid rgba(255, 68, 0, 0.2);
            z-index: 2;
            pointer-events: none;
            animation: heroBorderPulse 3s ease-in-out infinite;
        }

        @keyframes heroBorderPulse {
            0%,
            100% {
                border-color: rgba(255, 68, 0, 0.2);
            }
            50% {
                border-color: rgba(255, 68, 0, 0.5);
            }
        }

        .hero-image-wrap .glow-dot {
            position: absolute;
            width: 8px;
            height: 8px;
            background: var(--color-accent);
            border-radius: 50%;
            z-index: 3;
            pointer-events: none;
            animation: dotFloat 4s ease-in-out infinite;
            box-shadow: 0 0 12px var(--color-accent-glow);
        }
        .hero-image-wrap .glow-dot:nth-child(2) {
            top: 22%;
            right: 18%;
            animation-delay: 0.8s;
            width: 5px;
            height: 5px;
        }
        .hero-image-wrap .glow-dot:nth-child(3) {
            bottom: 30%;
            left: 15%;
            animation-delay: 2s;
            width: 6px;
            height: 6px;
        }

        @keyframes dotFloat {
            0%,
            100% {
                transform: translateY(0);
                opacity: 0.6;
            }
            50% {
                transform: translateY(-14px);
                opacity: 1;
            }
        }

        @media (max-width: 1024px) {
            .hero-grid {
                gap: 40px;
            }
            .hero-content h1 {
                font-size: clamp(2rem, 4vw, 3rem);
            }
        }

        @media (max-width: 768px) {
            .hero-grid {
                grid-template-columns: 1fr;
                gap: 32px;
                text-align: center;
            }
            .hero-content {
                align-items: center;
                order: 1;
            }
            .hero-content .hero-subtitle {
                max-width: 100%;
            }
            .hero-buttons {
                justify-content: center;
            }
            .hero-image-wrap {
                order: 0;
                max-width: 400px;
                margin: 0 auto;
                aspect-ratio: 16 / 10;
            }
            #hero {
                padding-top: calc(var(--nav-height) + 20px);
                padding-bottom: 40px;
                min-height: auto;
            }
        }

        /* ========== SECTION COMMON ========== */
        section {
            padding: var(--section-padding) 0;
            position: relative;
        }

        @media (max-width: 768px) {
            section {
                padding: 50px 0;
            }
        }

        .section-label {
            display: inline-block;
            font-size: 0.85rem;
            font-weight: 700;
            color: var(--color-primary);
            text-transform: uppercase;
            letter-spacing: 0.08em;
            margin-bottom: 8px;
        }

        .section-title {
            font-size: clamp(1.8rem, 3vw, 2.5rem);
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 12px;
            line-height: 1.2;
        }

        .section-desc {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 600px;
            margin-bottom: 40px;
            line-height: 1.6;
        }

        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header .section-desc {
            margin-left: auto;
            margin-right: auto;
        }

        /* ========== HIGHLIGHTS ========== */
        #highlights {
            background: var(--bg-deep);
            position: relative;
        }

        #highlights::before {
            content: '';
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60%;
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--border-subtle), transparent);
        }

        .highlights-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .highlight-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            text-align: center;
            transition: all var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .highlight-card::before {
            content: '';
            position: absolute;
            inset: 0;
            border-radius: var(--radius-md);
            border: 1px solid transparent;
            transition: border-color var(--transition-smooth);
            pointer-events: none;
            z-index: 1;
        }

        .highlight-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-glow), var(--shadow-card);
            border-color: var(--color-accent);
        }
        .highlight-card:hover::before {
            border-color: var(--color-accent);
        }

        .highlight-card .hl-icon {
            width: 56px;
            height: 56px;
            margin: 0 auto 16px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            z-index: 2;
        }

        .highlight-card .hl-icon.orange {
            background: rgba(255, 68, 0, 0.15);
        }
        .highlight-card .hl-icon.cyan {
            background: rgba(0, 240, 255, 0.12);
        }

        .highlight-card .hl-icon svg {
            width: 28px;
            height: 28px;
        }

        .highlight-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
            position: relative;
            z-index: 2;
        }

        .highlight-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.5;
            position: relative;
            z-index: 2;
        }

        @media (max-width: 1199px) and (min-width: 769px) {
            .highlights-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
        }

        @media (max-width: 768px) {
            .highlights-grid {
                grid-template-columns: 1fr;
                gap: 16px;
                max-width: 400px;
                margin: 0 auto;
            }
            .highlight-card {
                padding: 24px 20px;
            }
        }

        /* ========== CASES ========== */
        #cases {
            background: var(--bg-deep);
            position: relative;
        }

        #cases::before {
            content: '';
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60%;
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--border-subtle), transparent);
        }

        .cases-masonry {
            column-count: 3;
            column-gap: 20px;
        }

        .case-card {
            break-inside: avoid;
            margin-bottom: 20px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-subtle);
            transition: all var(--transition-smooth);
            cursor: pointer;
        }

        .case-card:hover {
            border-color: var(--color-accent);
            box-shadow: var(--shadow-glow);
        }
        .case-card:hover img {
            transform: scale(1.04);
        }

        .case-card .case-img-wrap {
            overflow: hidden;
            border-radius: var(--radius-sm) var(--radius-sm) 0 0;
            position: relative;
        }

        .case-card img {
            width: 100%;
            display: block;
            transition: transform var(--transition-smooth);
            border-radius: var(--radius-sm) var(--radius-sm) 0 0;
        }

        .case-card .case-info {
            padding: 16px 18px;
        }

        .case-card .case-title {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 6px;
        }

        .case-card .case-tag {
            display: inline-block;
            font-size: 0.78rem;
            color: var(--color-accent);
            background: var(--color-accent-bg);
            padding: 4px 10px;
            border-radius: 20px;
            font-weight: 600;
        }

        @media (max-width: 1199px) and (min-width: 769px) {
            .cases-masonry {
                column-count: 2;
                column-gap: 18px;
            }
            .case-card {
                margin-bottom: 18px;
            }
        }

        @media (max-width: 768px) {
            .cases-masonry {
                column-count: 2;
                column-gap: 12px;
            }
            .case-card {
                margin-bottom: 12px;
            }
            .case-card .case-info {
                padding: 12px 14px;
            }
            .case-card .case-title {
                font-size: 0.9rem;
            }
        }

        @media (max-width: 480px) {
            .cases-masonry {
                column-count: 1;
                column-gap: 0;
                max-width: 360px;
                margin: 0 auto;
            }
            .case-card {
                margin-bottom: 16px;
            }
        }

        /* ========== COMPARE ========== */
        #compare {
            background: var(--bg-deep);
            position: relative;
        }

        #compare::before {
            content: '';
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60%;
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--border-subtle), transparent);
        }

        .compare-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            align-items: stretch;
        }

        .compare-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            display: flex;
            flex-direction: column;
            transition: all var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }

        .compare-card.featured {
            background: var(--bg-card-light);
            border-top: 3px solid var(--color-primary);
            box-shadow: var(--shadow-card);
            transform: scale(1.03);
            z-index: 2;
        }

        .compare-card .badge-recommend {
            position: absolute;
            top: 14px;
            right: 14px;
            background: var(--color-primary);
            color: #FFF;
            font-size: 0.75rem;
            font-weight: 700;
            padding: 5px 12px;
            border-radius: 20px;
            letter-spacing: 0.04em;
            z-index: 3;
        }

        .compare-card .plan-tag {
            font-size: 0.85rem;
            font-weight: 700;
            color: var(--color-accent);
            text-transform: uppercase;
            letter-spacing: 0.06em;
            margin-bottom: 8px;
        }

        .compare-card .plan-name {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 16px;
        }

        .compare-card .plan-features {
            list-style: none;
            flex: 1;
            margin-bottom: 20px;
        }

        .compare-card .plan-features li {
            padding: 8px 0;
            font-size: 0.9rem;
            color: var(--text-secondary);
            border-bottom: 1px solid var(--border-subtle);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .compare-card .plan-features li .check-icon {
            color: var(--color-accent);
            font-weight: 700;
            flex-shrink: 0;
            font-size: 1rem;
        }

        @media (max-width: 1024px) {
            .compare-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 16px;
            }
            .compare-card {
                padding: 24px 16px;
            }
            .compare-card.featured {
                transform: scale(1.02);
            }
        }

        @media (max-width: 768px) {
            .compare-grid {
                grid-template-columns: 1fr;
                gap: 20px;
                max-width: 400px;
                margin: 0 auto;
            }
            .compare-card.featured {
                transform: none;
                order: -1;
            }
        }

        /* ========== FAQ ========== */
        #faq {
            background: var(--bg-deep);
            position: relative;
        }

        #faq::before {
            content: '';
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60%;
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--border-subtle), transparent);
        }

        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 0;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            overflow: hidden;
            transition: all var(--transition-smooth);
        }

        .faq-question {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 18px 20px;
            cursor: pointer;
            user-select: none;
            transition: background var(--transition-fast);
            position: relative;
        }
        .faq-question:hover {
            background: rgba(255, 255, 255, 0.02);
        }

        .faq-toggle {
            width: 28px;
            height: 28px;
            flex-shrink: 0;
            border-radius: 50%;
            background: rgba(255, 68, 0, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all var(--transition-smooth);
            font-size: 1.2rem;
            color: var(--color-primary);
            font-weight: 700;
            line-height: 1;
        }

        .faq-item.open .faq-toggle {
            transform: rotate(45deg);
            background: rgba(0, 240, 255, 0.15);
            color: var(--color-accent);
        }

        .faq-question-text {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-primary);
            flex: 1;
            line-height: 1.4;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-smooth), padding var(--transition-smooth);
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
        }

        .faq-answer-inner {
            padding: 0 20px 18px 62px;
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        @media (max-width: 768px) {
            .faq-question {
                padding: 16px 14px;
                gap: 10px;
            }
            .faq-question-text {
                font-size: 0.95rem;
            }
            .faq-answer-inner {
                padding: 0 14px 14px 52px;
                font-size: 0.85rem;
            }
            .faq-toggle {
                width: 24px;
                height: 24px;
                font-size: 1rem;
            }
        }

        /* ========== CTA ========== */
        #contact {
            background: var(--bg-deep);
            position: relative;
            overflow: hidden;
            padding: 80px 0;
        }

        #contact::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(155deg, transparent 35%, rgba(255, 68, 0, 0.07) 48%, transparent 52%),
                linear-gradient(200deg, transparent 55%, rgba(0, 240, 255, 0.04) 62%, transparent 68%);
            pointer-events: none;
            z-index: 0;
        }

        #contact .cta-inner {
            position: relative;
            z-index: 1;
            text-align: center;
            max-width: 650px;
            margin: 0 auto;
        }

        #contact .cta-title {
            font-size: clamp(1.8rem, 3.5vw, 2.6rem);
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 16px;
            line-height: 1.2;
        }

        #contact .cta-desc {
            font-size: 1.05rem;
            color: var(--text-secondary);
            margin-bottom: 32px;
            line-height: 1.6;
        }

        #contact .cta-buttons {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        @media (max-width: 768px) {
            #contact {
                padding: 50px 0;
            }
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: var(--bg-footer);
            border-top: 1px solid var(--border-subtle);
            padding: 32px 0;
            position: relative;
        }

        .footer-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .footer-copyright {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        .footer-links {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
        }

        .footer-links a {
            font-size: 0.85rem;
            color: var(--text-muted);
            transition: color var(--transition-fast);
        }
        .footer-links a:hover {
            color: var(--color-primary);
        }

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

        .back-to-top {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.85rem;
            color: var(--color-accent);
            cursor: pointer;
            transition: all var(--transition-fast);
            background: none;
            border: none;
            font-weight: 600;
        }
        .back-to-top:hover {
            color: var(--color-primary);
        }
        .back-to-top .arrow-up {
            display: inline-block;
            transition: transform var(--transition-fast);
        }
        .back-to-top:hover .arrow-up {
            transform: translateY(-3px);
        }

        @media (max-width: 768px) {
            .footer-inner {
                flex-direction: column;
                text-align: center;
                gap: 12px;
            }
            .footer-links {
                justify-content: center;
            }
        }

        /* ========== UTILITY ========== */
        .text-center {
            text-align: center;
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }

        /* Grid line texture for body */
        body::after {
            content: '';
            position: fixed;
            inset: 0;
            pointer-events: none;
            z-index: 9999;
            opacity: 0.015;
            background-image:
                repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(255, 255, 255, 0.3) 2px, rgba(255, 255, 255, 0.3) 3px),
                repeating-linear-gradient(90deg, transparent, transparent 2px, rgba(255, 255, 255, 0.3) 2px, rgba(255, 255, 255, 0.3) 3px);
        }