/* roulang page: index */
:root {
            --purple: #7B2FBE;
            --orange: #F85C1E;
            --gradient-main: linear-gradient(135deg, #7B2FBE 0%, #F85C1E 100%);
            --gradient-reverse: linear-gradient(135deg, #F85C1E 0%, #7B2FBE 100%);
            --bg-deep: #0E0E1A;
            --bg-card: #1A1A2E;
            --bg-card-alt: rgba(255, 255, 255, 0.04);
            --text-primary: #F0F0F5;
            --text-secondary: #B0B0C0;
            --text-muted: #787890;
            --neon-cyan: #00F0B5;
            --neon-cyan-dim: rgba(0, 240, 181, 0.15);
            --yellow-accent: #FFD166;
            --white: #FFFFFF;
            --card-radius: 20px;
            --btn-radius: 50px;
            --input-radius: 12px;
            --shadow-sm: 0 4px 16px rgba(0, 0, 0, 0.2);
            --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.3);
            --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.45);
            --shadow-glow-purple: 0 8px 32px rgba(123, 47, 190, 0.35);
            --shadow-glow-orange: 0 8px 32px rgba(248, 92, 30, 0.3);
            --shadow-glow-cyan: 0 4px 20px rgba(0, 240, 181, 0.25);
            --spacing-section: 100px;
            --spacing-card-pad: 32px;
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            --font-title: 'PingFang SC', 'Microsoft YaHei', 'Source Han Sans CN', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
            --font-body: 'PingFang SC', 'Microsoft YaHei', 'Source Han Sans CN', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
            scroll-padding-top: 80px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-body);
            background-color: var(--bg-deep);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
            min-height: 100vh;
            overflow-x: hidden;
            letter-spacing: 0.02em;
        }

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

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

        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
        }

        button {
            cursor: pointer;
        }

        input,
        textarea {
            width: 100%;
        }

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

        @media (max-width: 1024px) {
            .container {
                padding: 0 20px;
            }
            :root {
                --spacing-section: 72px;
                --spacing-card-pad: 24px;
            }
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
            :root {
                --spacing-section: 56px;
                --spacing-card-pad: 20px;
                --card-radius: 16px;
            }
            html {
                scroll-padding-top: 64px;
            }
        }

        /* ========== 导航 ========== */
        #nav {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(14, 14, 26, 0.82);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid transparent;
            border-image: linear-gradient(90deg, var(--purple), var(--orange)) 1;
            transition: background var(--transition-smooth), box-shadow var(--transition-smooth);
        }
        #nav.scrolled {
            background: rgba(14, 14, 26, 0.94);
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
        }
        #nav .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-title);
            font-weight: 800;
            font-size: 1.35rem;
            color: var(--white);
            letter-spacing: 0.04em;
            white-space: nowrap;
            flex-shrink: 0;
        }
        .nav-logo .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: var(--gradient-main);
            color: #fff;
            font-size: 1.1rem;
            flex-shrink: 0;
        }
        .nav-logo .logo-text {
            background: linear-gradient(135deg, #D4A0FF 0%, #FFB088 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 28px;
            list-style: none;
            flex-shrink: 0;
        }
        .nav-links a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            position: relative;
            padding: 6px 0;
            transition: color var(--transition-fast);
            letter-spacing: 0.03em;
        }
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2.5px;
            border-radius: 2px;
            background: var(--gradient-main);
            transition: width var(--transition-smooth);
        }
        .nav-links a:hover {
            color: var(--neon-cyan);
        }
        .nav-links a:hover::after {
            width: 100%;
        }
        .nav-cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 10px 22px;
            border-radius: var(--btn-radius);
            background: var(--gradient-main);
            color: #fff !important;
            font-weight: 700;
            font-size: 0.9rem;
            letter-spacing: 0.04em;
            white-space: nowrap;
            transition: all var(--transition-smooth);
            box-shadow: var(--shadow-glow-purple);
            flex-shrink: 0;
        }
        .nav-cta-btn:hover {
            background: var(--gradient-reverse);
            box-shadow: var(--shadow-glow-orange), 0 12px 36px rgba(248, 92, 30, 0.4);
            transform: translateY(-2px);
            color: #fff !important;
        }
        .nav-cta-btn::after {
            display: none !important;
        }

        /* 汉堡菜单 */
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            z-index: 1100;
            padding: 6px;
            background: none;
            border: none;
        }
        .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: rotate(45deg) translate(5px, 5px);
            background: var(--neon-cyan);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
            transform: scaleX(0);
        }
        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
            background: var(--neon-cyan);
        }

        .mobile-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100vh;
            background: rgba(14, 14, 26, 0.97);
            z-index: 1050;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 32px;
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
        }
        .mobile-overlay.open {
            display: flex;
        }
        .mobile-overlay a {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: 0.06em;
            transition: color var(--transition-fast);
        }
        .mobile-overlay a:hover {
            color: var(--neon-cyan);
        }
        .mobile-overlay .mobile-cta {
            margin-top: 16px;
            padding: 14px 36px;
            border-radius: var(--btn-radius);
            background: var(--gradient-main);
            color: #fff !important;
            font-weight: 700;
            font-size: 1.05rem;
            box-shadow: var(--shadow-glow-purple);
        }

        @media (max-width: 768px) {
            .nav-links,
            .nav-cta-btn {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            #nav .nav-inner {
                height: 58px;
                padding: 0 16px;
            }
            .nav-logo {
                font-size: 1.15rem;
            }
            .nav-logo .logo-icon {
                width: 32px;
                height: 32px;
                border-radius: 8px;
                font-size: 0.95rem;
            }
        }

        /* ========== Hero ========== */
        #hero {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            background: var(--bg-deep);
            overflow: hidden;
            padding-top: 68px;
        }
        #hero .hero-particles {
            position: absolute;
            inset: 0;
            pointer-events: none;
            z-index: 0;
            opacity: 0.55;
        }
        .hero-particle {
            position: absolute;
            border-radius: 50%;
            filter: blur(60px);
            animation: floatParticle 8s ease-in-out infinite alternate;
        }
        .hero-particle:nth-child(1) {
            width: 280px;
            height: 280px;
            background: rgba(123, 47, 190, 0.28);
            top: 10%;
            left: -8%;
            animation-delay: 0s;
            animation-duration: 9s;
        }
        .hero-particle:nth-child(2) {
            width: 220px;
            height: 220px;
            background: rgba(248, 92, 30, 0.22);
            top: 50%;
            right: -6%;
            animation-delay: -3s;
            animation-duration: 7.5s;
        }
        .hero-particle:nth-child(3) {
            width: 180px;
            height: 180px;
            background: rgba(0, 240, 181, 0.12);
            bottom: 8%;
            left: 30%;
            animation-delay: -5s;
            animation-duration: 10s;
        }
        .hero-particle:nth-child(4) {
            width: 160px;
            height: 160px;
            background: rgba(123, 47, 190, 0.18);
            top: 30%;
            right: 25%;
            animation-delay: -2s;
            animation-duration: 8.5s;
        }
        @keyframes floatParticle {
            0% {
                transform: translate(0, 0) scale(1);
            }
            33% {
                transform: translate(30px, -25px) scale(1.15);
            }
            66% {
                transform: translate(-20px, 20px) scale(0.9);
            }
            100% {
                transform: translate(15px, -10px) scale(1.08);
            }
        }
        #hero .container {
            position: relative;
            z-index: 1;
            display: grid;
            grid-template-columns: 6fr 4fr;
            gap: 48px;
            align-items: center;
            width: 100%;
        }
        .hero-left h1 {
            font-family: var(--font-title);
            font-weight: 800;
            font-size: 3rem;
            line-height: 1.25;
            color: var(--white);
            margin-bottom: 20px;
            letter-spacing: 0.03em;
        }
        .hero-left h1 .highlight {
            background: var(--gradient-main);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-left .hero-sub {
            font-size: 1.1rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 36px;
            max-width: 520px;
        }
        .hero-btns {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 30px;
            border-radius: var(--btn-radius);
            background: var(--gradient-main);
            color: #fff;
            font-weight: 700;
            font-size: 1rem;
            letter-spacing: 0.04em;
            box-shadow: var(--shadow-glow-purple);
            transition: all var(--transition-smooth);
            white-space: nowrap;
        }
        .btn-primary:hover {
            background: var(--gradient-reverse);
            box-shadow: var(--shadow-glow-orange), 0 14px 40px rgba(248, 92, 30, 0.45);
            transform: translateY(-3px);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 30px;
            border-radius: var(--btn-radius);
            border: 2px solid var(--neon-cyan);
            color: var(--neon-cyan);
            font-weight: 700;
            font-size: 1rem;
            letter-spacing: 0.04em;
            background: transparent;
            transition: all var(--transition-smooth);
            white-space: nowrap;
        }
        .btn-outline:hover {
            background: var(--neon-cyan-dim);
            border-color: #fff;
            color: #fff;
            box-shadow: var(--shadow-glow-cyan);
            transform: translateY(-3px);
        }
        .hero-right {
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
        }
        .hero-right .hero-img-wrap {
            position: relative;
            border-radius: var(--card-radius);
            overflow: hidden;
            box-shadow: 0 0 60px rgba(123, 47, 190, 0.3), 0 0 30px rgba(248, 92, 30, 0.2);
            animation: heroFloat 6s ease-in-out infinite;
        }
        @keyframes heroFloat {
            0%,
            100% {
                transform: translateY(0);
            }
            50% {
                transform: translateY(-14px);
            }
        }
        .hero-right .hero-img-wrap img {
            border-radius: var(--card-radius);
            width: 100%;
            aspect-ratio: 16/12;
            object-fit: cover;
            display: block;
        }
        .hero-right .hero-glow-ring {
            position: absolute;
            inset: -6px;
            border-radius: calc(var(--card-radius) + 6px);
            border: 2px solid transparent;
            background: linear-gradient(135deg, rgba(123, 47, 190, 0.5), rgba(248, 92, 30, 0.5)) border-box;
            -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
            -webkit-mask-composite: xor;
            mask-composite: exclude;
            pointer-events: none;
        }
        @media (max-width: 1024px) {
            #hero .container {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .hero-left h1 {
                font-size: 2.4rem;
            }
            .hero-left .hero-sub {
                font-size: 1rem;
            }
        }
        @media (max-width: 768px) {
            #hero {
                min-height: auto;
                padding-top: 80px;
                padding-bottom: 48px;
            }
            #hero .container {
                grid-template-columns: 1fr;
                gap: 28px;
                text-align: center;
            }
            .hero-left h1 {
                font-size: 1.9rem;
            }
            .hero-left .hero-sub {
                font-size: 0.95rem;
                margin-left: auto;
                margin-right: auto;
                max-width: 100%;
            }
            .hero-btns {
                justify-content: center;
            }
            .hero-right .hero-img-wrap {
                max-width: 340px;
                margin: 0 auto;
            }
            .hero-right .hero-img-wrap img {
                aspect-ratio: 16/10;
            }
            .hero-particle:nth-child(1) {
                width: 160px;
                height: 160px;
                top: 5%;
                left: -15%;
            }
            .hero-particle:nth-child(2) {
                width: 130px;
                height: 130px;
                top: 55%;
                right: -15%;
            }
        }

        /* ========== 通用板块标题 ========== */
        .section-head {
            text-align: center;
            margin-bottom: 52px;
        }
        .section-head h2 {
            font-family: var(--font-title);
            font-weight: 800;
            font-size: 2.2rem;
            color: var(--white);
            letter-spacing: 0.03em;
            margin-bottom: 10px;
        }
        .section-head .section-sub {
            font-size: 1rem;
            color: var(--text-muted);
            max-width: 560px;
            margin: 0 auto;
        }
        .section-head h2 .accent-dot {
            display: inline-block;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--neon-cyan);
            margin-left: 6px;
            vertical-align: middle;
            box-shadow: 0 0 12px var(--neon-cyan);
        }
        @media (max-width: 768px) {
            .section-head h2 {
                font-size: 1.7rem;
            }
            .section-head {
                margin-bottom: 36px;
            }
        }

        /* ========== Features ========== */
        #features {
            padding: var(--spacing-section) 0;
            background: var(--bg-deep);
        }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--card-radius);
            padding: var(--spacing-card-pad);
            text-align: center;
            border: 1px solid rgba(255, 255, 255, 0.06);
            transition: all var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: var(--gradient-main);
            opacity: 0;
            transition: opacity var(--transition-smooth);
            border-radius: 0 0 4px 4px;
        }
        .feature-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-lg), 0 0 40px rgba(123, 47, 190, 0.15);
            border-color: rgba(255, 255, 255, 0.15);
        }
        .feature-card:hover::before {
            opacity: 1;
        }
        .feature-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 56px;
            height: 56px;
            border-radius: 16px;
            background: var(--neon-cyan-dim);
            color: var(--neon-cyan);
            font-size: 1.5rem;
            margin-bottom: 16px;
            transition: all var(--transition-smooth);
        }
        .feature-card:hover .feature-icon {
            background: rgba(0, 240, 181, 0.22);
            box-shadow: var(--shadow-glow-cyan);
        }
        .feature-badge {
            display: inline-block;
            padding: 5px 14px;
            border-radius: 20px;
            background: var(--gradient-main);
            color: #fff;
            font-weight: 800;
            font-size: 0.95rem;
            letter-spacing: 0.03em;
            margin-bottom: 8px;
            white-space: nowrap;
        }
        .feature-card h3 {
            font-family: var(--font-title);
            font-weight: 700;
            font-size: 1.05rem;
            color: var(--white);
            margin-bottom: 6px;
            letter-spacing: 0.02em;
        }
        .feature-card p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.6;
        }
        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
        }
        @media (max-width: 520px) {
            .features-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
        }

        /* ========== Cases 瀑布流 ========== */
        #cases {
            padding: var(--spacing-section) 0;
            background: #111120;
        }
        .cases-masonry {
            columns: 3;
            column-gap: 20px;
        }
        .case-card {
            break-inside: avoid;
            margin-bottom: 20px;
            background: var(--bg-card);
            border-radius: var(--card-radius);
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.05);
            transition: all var(--transition-smooth);
            cursor: default;
        }
        .case-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg), 0 0 30px rgba(123, 47, 190, 0.18);
            border-color: rgba(255, 255, 255, 0.14);
        }
        .case-card .case-img {
            overflow: hidden;
            display: block;
        }
        .case-card .case-img img {
            width: 100%;
            display: block;
            object-fit: cover;
            transition: transform var(--transition-smooth);
        }
        .case-card:hover .case-img img {
            transform: scale(1.04);
        }
        .case-card .case-body {
            padding: 18px 18px 16px;
        }
        .case-card .case-body h3 {
            font-family: var(--font-title);
            font-weight: 700;
            font-size: 1rem;
            color: var(--white);
            margin-bottom: 6px;
            letter-spacing: 0.02em;
        }
        .case-card .case-body p {
            font-size: 0.85rem;
            color: var(--text-muted);
            line-height: 1.5;
            margin-bottom: 10px;
        }
        .case-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
        }
        .case-tag {
            display: inline-block;
            padding: 3px 10px;
            border-radius: 12px;
            background: rgba(255, 255, 255, 0.06);
            color: var(--text-secondary);
            font-size: 0.75rem;
            letter-spacing: 0.03em;
            white-space: nowrap;
        }
        @media (max-width: 1024px) {
            .cases-masonry {
                columns: 2;
            }
        }
        @media (max-width: 520px) {
            .cases-masonry {
                columns: 1;
            }
        }

        /* ========== Plans ========== */
        #plans {
            padding: var(--spacing-section) 0;
            background: var(--bg-deep);
        }
        .plans-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            align-items: stretch;
        }
        .plan-card {
            background: var(--bg-card);
            border-radius: var(--card-radius);
            padding: var(--spacing-card-pad);
            border: 1px solid rgba(255, 255, 255, 0.06);
            transition: all var(--transition-smooth);
            display: flex;
            flex-direction: column;
            position: relative;
        }
        .plan-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
        }
        .plan-card.featured {
            border: 2px solid transparent;
            background: linear-gradient(#1A1A2E, #1A1A2E) padding-box,
                var(--gradient-main) border-box;
            box-shadow: var(--shadow-glow-purple);
            position: relative;
            z-index: 1;
        }
        .plan-badge {
            position: absolute;
            top: -14px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--yellow-accent);
            color: #1a1a1a;
            font-weight: 800;
            font-size: 0.78rem;
            padding: 5px 16px;
            border-radius: 20px;
            letter-spacing: 0.04em;
            white-space: nowrap;
            z-index: 2;
            box-shadow: 0 4px 16px rgba(255, 209, 102, 0.35);
        }
        .plan-card h3 {
            font-family: var(--font-title);
            font-weight: 800;
            font-size: 1.3rem;
            color: var(--white);
            margin-bottom: 6px;
            letter-spacing: 0.03em;
        }
        .plan-price {
            font-size: 2.2rem;
            font-weight: 800;
            background: var(--gradient-main);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 18px;
            letter-spacing: 0.02em;
        }
        .plan-price small {
            font-size: 0.85rem;
            font-weight: 500;
            -webkit-text-fill-color: var(--text-muted);
        }
        .plan-features {
            list-style: none;
            flex: 1;
            margin-bottom: 20px;
        }
        .plan-features li {
            padding: 7px 0;
            font-size: 0.9rem;
            color: var(--text-secondary);
            display: flex;
            align-items: flex-start;
            gap: 8px;
            line-height: 1.5;
        }
        .plan-features li i {
            color: var(--neon-cyan);
            font-size: 0.85rem;
            margin-top: 3px;
            flex-shrink: 0;
        }
        .plan-card .btn-primary {
            width: 100%;
            justify-content: center;
            font-size: 0.95rem;
        }
        @media (max-width: 1024px) {
            .plans-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 16px;
            }
            .plan-card {
                padding: 20px 16px;
            }
            .plan-price {
                font-size: 1.7rem;
            }
        }
        @media (max-width: 768px) {
            .plans-grid {
                grid-template-columns: 1fr;
                gap: 20px;
                max-width: 420px;
                margin: 0 auto;
            }
            .plan-badge {
                top: -12px;
                font-size: 0.72rem;
                padding: 4px 14px;
            }
        }

        /* ========== FAQ ========== */
        #faq {
            padding: var(--spacing-section) 0;
            background: #111120;
        }
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 2px;
        }
        .faq-item {
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            transition: all var(--transition-fast);
        }
        .faq-question {
            width: 100%;
            text-align: left;
            padding: 18px 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            font-weight: 700;
            font-size: 1rem;
            color: var(--text-primary);
            letter-spacing: 0.03em;
            cursor: pointer;
            transition: color var(--transition-fast);
            background: none;
            border: none;
            font-family: var(--font-body);
        }
        .faq-question:hover {
            color: var(--neon-cyan);
        }
        .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.05);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--neon-cyan);
            font-size: 0.85rem;
            transition: all var(--transition-smooth);
        }
        .faq-item.open .faq-icon {
            background: var(--neon-cyan-dim);
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 0;
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.65;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 0 16px 0;
        }
        @media (max-width: 768px) {
            .faq-question {
                font-size: 0.95rem;
                padding: 15px 0;
            }
            .faq-icon {
                width: 24px;
                height: 24px;
                font-size: 0.75rem;
            }
        }

        /* ========== CTA Contact ========== */
        #contact {
            padding: var(--spacing-section) 0;
            background: var(--bg-deep);
            position: relative;
            overflow: hidden;
        }
        #contact .contact-bg {
            position: absolute;
            inset: 0;
            background: var(--gradient-main);
            opacity: 0.06;
            pointer-events: none;
            z-index: 0;
        }
        #contact .contact-bg-img {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.12;
            pointer-events: none;
            z-index: 0;
            filter: blur(1px);
        }
        #contact .container {
            position: relative;
            z-index: 1;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .contact-info h2 {
            font-family: var(--font-title);
            font-weight: 800;
            font-size: 2rem;
            color: var(--white);
            letter-spacing: 0.03em;
            margin-bottom: 14px;
        }
        .contact-info p {
            color: var(--text-secondary);
            font-size: 1rem;
            line-height: 1.65;
            margin-bottom: 24px;
        }
        .contact-detail {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            margin-bottom: 10px;
        }
        .contact-detail i {
            color: var(--neon-cyan);
            width: 20px;
            text-align: center;
        }
        .contact-form {
            background: var(--bg-card);
            border-radius: var(--card-radius);
            padding: var(--spacing-card-pad);
            border: 1px solid rgba(255, 255, 255, 0.08);
            box-shadow: var(--shadow-md);
        }
        .contact-form .form-group {
            margin-bottom: 16px;
        }
        .contact-form label {
            display: block;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-secondary);
            margin-bottom: 6px;
            letter-spacing: 0.03em;
        }
        .contact-form input,
        .contact-form textarea {
            width: 100%;
            padding: 12px 16px;
            border-radius: var(--input-radius);
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.12);
            color: var(--text-primary);
            font-size: 0.95rem;
            transition: all var(--transition-fast);
            letter-spacing: 0.02em;
        }
        .contact-form input:focus,
        .contact-form textarea:focus {
            border-color: var(--neon-cyan);
            box-shadow: 0 0 0 3px rgba(0, 240, 181, 0.1);
            outline: none;
            background: rgba(255, 255, 255, 0.06);
        }
        .contact-form textarea {
            resize: vertical;
            min-height: 100px;
        }
        .contact-form .btn-submit {
            width: 100%;
            padding: 14px;
            border-radius: var(--btn-radius);
            background: var(--gradient-main);
            color: #fff;
            font-weight: 700;
            font-size: 1rem;
            letter-spacing: 0.05em;
            cursor: pointer;
            transition: all var(--transition-smooth);
            box-shadow: var(--shadow-glow-purple);
            border: none;
        }
        .contact-form .btn-submit:hover {
            background: var(--gradient-reverse);
            box-shadow: var(--shadow-glow-orange), 0 12px 36px rgba(248, 92, 30, 0.4);
            transform: translateY(-2px);
        }
        @media (max-width: 768px) {
            #contact .container {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .contact-info h2 {
                font-size: 1.6rem;
                text-align: center;
            }
            .contact-info p {
                text-align: center;
            }
            .contact-detail {
                justify-content: center;
            }
            .contact-form {
                padding: 20px 16px;
            }
        }

        /* ========== Footer ========== */
        #footer {
            background: #0A0A14;
            padding: 48px 0 28px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 32px;
        }
        .footer-col h4 {
            font-family: var(--font-title);
            font-weight: 700;
            font-size: 1rem;
            color: var(--white);
            margin-bottom: 14px;
            letter-spacing: 0.04em;
        }
        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer-col ul li a {
            color: var(--text-muted);
            font-size: 0.9rem;
            transition: color var(--transition-fast);
        }
        .footer-col ul li a:hover {
            color: var(--neon-cyan);
        }
        .footer-logo {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-family: var(--font-title);
            font-weight: 800;
            font-size: 1.2rem;
            color: var(--white);
            margin-bottom: 10px;
        }
        .footer-logo .logo-icon-sm {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 28px;
            height: 28px;
            border-radius: 7px;
            background: var(--gradient-main);
            color: #fff;
            font-size: 0.8rem;
        }
        .footer-social {
            display: flex;
            gap: 12px;
            margin-top: 12px;
        }
        .footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.05);
            color: var(--text-muted);
            font-size: 0.95rem;
            transition: all var(--transition-fast);
        }
        .footer-social a:hover {
            background: var(--neon-cyan-dim);
            color: var(--neon-cyan);
            box-shadow: var(--shadow-glow-cyan);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 20px;
            text-align: center;
            font-size: 0.8rem;
            color: var(--text-muted);
            letter-spacing: 0.03em;
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
                text-align: center;
            }
            .footer-social {
                justify-content: center;
            }
            .footer-col ul {
                align-items: center;
            }
        }

        /* ========== 回到顶部 ========== */
        .back-to-top {
            position: fixed;
            bottom: 28px;
            right: 28px;
            z-index: 900;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--gradient-main);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            box-shadow: var(--shadow-glow-purple);
            transition: all var(--transition-smooth);
            opacity: 0;
            pointer-events: none;
            transform: translateY(12px);
            cursor: pointer;
            border: none;
        }
        .back-to-top.visible {
            opacity: 1;
            pointer-events: auto;
            transform: translateY(0);
        }
        .back-to-top:hover {
            background: var(--gradient-reverse);
            box-shadow: var(--shadow-glow-orange);
            transform: translateY(-3px);
        }
        @media (max-width: 768px) {
            .back-to-top {
                bottom: 18px;
                right: 16px;
                width: 38px;
                height: 38px;
                font-size: 0.95rem;
            }
        }

        /* ========== 无障碍焦点 ========== */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--neon-cyan);
            outline-offset: 3px;
        }