/* roulang page: index */
:root {
            --bg-primary: #0b0d12;
            --bg-card: #13161d;
            --bg-elevated: #10131a;
            --accent: #c8ff3e;
            --text-primary: #f0f2f5;
            --text-secondary: #7a7f8a;
            --text-muted: #5a5f6a;
            --border-subtle: rgba(255, 255, 255, 0.06);
            --border-light: rgba(255, 255, 255, 0.12);
            --input-bg: #1a1f2b;
            --radius-sm: 4px;
            --radius-md: 6px;
            --radius-pill: 9999px;
            --transition-fast: 0.2s ease;
            --transition-smooth: 0.35s ease;
        }

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

        html {
            scroll-behavior: smooth;
            scroll-padding-top: 80px;
        }

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Helvetica Neue', sans-serif;
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-fast);
        }
        button {
            cursor: pointer;
            font-family: inherit;
        }
        input,
        textarea {
            font-family: inherit;
        }

        .container-main {
            max-width: 1280px;
            margin: 0 auto;
            padding-left: 2rem;
            padding-right: 2rem;
        }

        @media (max-width: 640px) {
            .container-main {
                padding-left: 1.25rem;
                padding-right: 1.25rem;
            }
            html {
                scroll-padding-top: 65px;
            }
        }

        .accent-line {
            display: block;
            width: 40px;
            height: 4px;
            background-color: var(--accent);
            border-radius: 2px;
            margin-top: 4px;
            margin-bottom: 8px;
        }
        .accent-line-sm {
            width: 24px;
            height: 3px;
            background-color: var(--accent);
            border-radius: 2px;
            display: inline-block;
            vertical-align: middle;
            margin-right: 10px;
        }

        /* 导航栏 */
        #main-nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: 72px;
            display: flex;
            align-items: center;
            transition: background-color 0.35s ease, backdrop-filter 0.35s ease, box-shadow 0.35s ease;
            background-color: transparent;
            backdrop-filter: blur(0px);
            -webkit-backdrop-filter: blur(0px);
        }
        #main-nav.scrolled {
            background-color: rgba(11, 13, 18, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            box-shadow: 0 1px 0 var(--border-subtle);
        }
        #main-nav .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 2rem;
            height: 100%;
        }
        @media (max-width: 640px) {
            #main-nav {
                height: 60px;
            }
            #main-nav .nav-inner {
                padding: 0 1.25rem;
            }
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.25rem;
            color: #fff;
            letter-spacing: 0.02em;
            white-space: nowrap;
            z-index: 1001;
        }
        .nav-logo .logo-icon {
            width: 28px;
            height: 28px;
            flex-shrink: 0;
        }
        .nav-links-desktop {
            display: flex;
            align-items: center;
            gap: 2rem;
            list-style: none;
        }
        .nav-links-desktop a {
            font-size: 0.9rem;
            font-weight: 500;
            color: #b0b5bf;
            letter-spacing: 0.02em;
            position: relative;
            padding-bottom: 4px;
            transition: color var(--transition-fast);
        }
        .nav-links-desktop a:hover,
        .nav-links-desktop a.nav-active {
            color: var(--accent);
        }
        .nav-links-desktop a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent);
            transition: width var(--transition-fast);
            border-radius: 1px;
        }
        .nav-links-desktop a:hover::after,
        .nav-links-desktop a.nav-active::after {
            width: 100%;
        }
        .nav-cta-btn {
            background: var(--accent);
            color: #0b0d12;
            font-weight: 600;
            font-size: 0.875rem;
            padding: 10px 22px;
            border-radius: var(--radius-sm);
            letter-spacing: 0.02em;
            transition: filter var(--transition-fast), transform var(--transition-fast);
            white-space: nowrap;
            border: none;
        }
        .nav-cta-btn:hover {
            filter: brightness(1.1);
            transform: scale(1.03);
        }
        @media (max-width: 1023px) {
            .nav-links-desktop {
                display: none;
            }
            .nav-cta-btn.desktop-only {
                display: none;
            }
        }
        @media (min-width: 1024px) {
            .hamburger-btn {
                display: none;
            }
        }

        /* 汉堡菜单 */
        .hamburger-btn {
            display: flex;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            padding: 8px;
            z-index: 1001;
            cursor: pointer;
        }
        .hamburger-btn span {
            display: block;
            width: 26px;
            height: 2px;
            background: #fff;
            border-radius: 2px;
            transition: transform 0.3s ease, opacity 0.3s ease;
        }
        .hamburger-btn.active span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .hamburger-btn.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger-btn.active span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }
        #mobile-menu {
            position: fixed;
            inset: 0;
            background: #0b0d12;
            z-index: 999;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 2rem;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.35s ease;
        }
        #mobile-menu.open {
            opacity: 1;
            pointer-events: auto;
        }
        #mobile-menu a {
            font-size: 1.25rem;
            font-weight: 500;
            color: #d0d4db;
            letter-spacing: 0.03em;
            transition: color var(--transition-fast);
        }
        #mobile-menu a:hover,
        #mobile-menu a.nav-active {
            color: var(--accent);
        }

        /* 探照灯动画 */
        @keyframes searchlight-sweep {
            0% {
                transform: translate(-40%, -30%);
            }
            25% {
                transform: translate(30%, -20%);
            }
            50% {
                transform: translate(35%, 25%);
            }
            75% {
                transform: translate(-25%, 30%);
            }
            100% {
                transform: translate(-40%, -30%);
            }
        }
        .searchlight-container {
            position: relative;
            width: 100%;
            height: 100%;
            min-height: 400px;
            overflow: hidden;
        }
        .searchlight-glow {
            position: absolute;
            width: 500px;
            height: 500px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(200, 255, 62, 0.06) 0%, rgba(200, 255, 62, 0.015) 35%, transparent 70%);
            pointer-events: none;
            animation: searchlight-sweep 8s ease-in-out infinite;
            top: 50%;
            left: 50%;
            margin-left: -250px;
            margin-top: -250px;
        }
        @media (max-width: 640px) {
            .searchlight-container {
                min-height: 120px;
            }
            .searchlight-glow {
                width: 250px;
                height: 250px;
                margin-left: -125px;
                margin-top: -125px;
            }
        }

        /* 滚动渐显 */
        .reveal-section {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.7s ease, transform 0.7s ease;
        }
        .reveal-section.visible {
            opacity: 1;
            transform: translateY(0);
        }
        .reveal-stagger>* {
            opacity: 0;
            transform: translateY(24px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }
        .reveal-stagger.visible>*:nth-child(1) {
            transition-delay: 0s;
            opacity: 1;
            transform: translateY(0);
        }
        .reveal-stagger.visible>*:nth-child(2) {
            transition-delay: 0.1s;
            opacity: 1;
            transform: translateY(0);
        }
        .reveal-stagger.visible>*:nth-child(3) {
            transition-delay: 0.2s;
            opacity: 1;
            transform: translateY(0);
        }
        .reveal-stagger.visible>*:nth-child(4) {
            transition-delay: 0.3s;
            opacity: 1;
            transform: translateY(0);
        }
        .reveal-stagger.visible>*:nth-child(5) {
            transition-delay: 0.4s;
            opacity: 1;
            transform: translateY(0);
        }

        /* 卡片hover细线 */
        .card-accent-hover {
            position: relative;
            overflow: hidden;
        }
        .card-accent-hover::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 0;
            background: var(--accent);
            transition: width 0.3s ease;
            z-index: 1;
            border-radius: 0 2px 2px 0;
        }
        .card-accent-hover:hover::before {
            width: 3px;
        }
        .card-accent-hover:hover {
            transform: translateY(-4px);
        }

        /* FAQ折叠 */
        .faq-item {
            border-bottom: 1px solid var(--border-subtle);
        }
        .faq-trigger {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.1rem;
            font-weight: 500;
            padding: 20px 4px;
            cursor: pointer;
            text-align: left;
            letter-spacing: 0.01em;
        }
        .faq-trigger .faq-icon {
            width: 24px;
            height: 24px;
            flex-shrink: 0;
            transition: transform 0.35s ease;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .faq-trigger .faq-icon svg {
            width: 18px;
            height: 18px;
            stroke: #b0b5bf;
            stroke-width: 2;
            fill: none;
            transition: stroke var(--transition-fast);
        }
        .faq-trigger:hover .faq-icon svg {
            stroke: var(--accent);
        }
        .faq-item.active .faq-icon {
            transform: rotate(45deg);
        }
        .faq-panel {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
        }
        .faq-item.active .faq-panel {
            max-height: 300px;
            padding-bottom: 16px;
        }
        .faq-panel p {
            color: #b0b5bf;
            font-size: 0.95rem;
            line-height: 1.75;
            padding-right: 8px;
        }

        /* 输入框 */
        .custom-input {
            background: var(--input-bg);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius-sm);
            padding: 14px 16px;
            color: #fff;
            font-size: 0.95rem;
            width: 100%;
            transition: border-color var(--transition-fast);
            outline: none;
        }
        .custom-input:focus {
            border-color: var(--accent);
        }
        .custom-input::placeholder {
            color: #5a5f6a;
        }

        /* 案例瀑布 */
        .case-columns {
            column-count: 3;
            column-gap: 24px;
        }
        @media (max-width: 1023px) and (min-width: 641px) {
            .case-columns {
                column-count: 2;
                column-gap: 20px;
            }
        }
        @media (max-width: 640px) {
            .case-columns {
                column-count: 1;
                column-gap: 0;
            }
        }
        .case-card {
            break-inside: avoid;
            margin-bottom: 24px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            box-shadow: 0 1px 0 rgba(255, 255, 255, 0.04), 0 4px 24px rgba(0, 0, 0, 0.4);
        }
        .case-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06), 0 8px 32px rgba(0, 0, 0, 0.55);
        }
        .case-card-img {
            width: 100%;
            aspect-ratio: 16 / 9;
            object-fit: cover;
            background: #1a1f2b;
            display: block;
        }
        .case-card-body {
            padding: 20px 22px;
        }

        /* VS徽标 */
        .vs-badge {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            border: 2px solid rgba(255, 255, 255, 0.2);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.85rem;
            color: #fff;
            background: #0b0d12;
            z-index: 5;
            letter-spacing: 0.04em;
        }

        /* 区块间距 */
        .section-padding {
            padding: 120px 0;
        }
        @media (max-width: 640px) {
            .section-padding {
                padding: 80px 0;
            }
        }

        /* CTA按钮 */
        .btn-accent-fill {
            background: var(--accent);
            color: #0b0d12;
            font-weight: 600;
            border: none;
            border-radius: var(--radius-sm);
            padding: 14px 32px;
            font-size: 1rem;
            letter-spacing: 0.02em;
            transition: filter var(--transition-fast), transform var(--transition-fast);
            display: inline-block;
            text-align: center;
            cursor: pointer;
        }
        .btn-accent-fill:hover {
            filter: brightness(1.12);
            transform: scale(1.03);
        }
        .btn-outline {
            background: transparent;
            color: #fff;
            font-weight: 500;
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: var(--radius-sm);
            padding: 14px 32px;
            font-size: 1rem;
            letter-spacing: 0.02em;
            transition: border-color var(--transition-fast), color var(--transition-fast);
            display: inline-block;
            text-align: center;
            cursor: pointer;
        }
        .btn-outline:hover {
            border-color: var(--accent);
            color: var(--accent);
        }
        .btn-accent-fill.lg-btn {
            padding: 16px 44px;
            font-size: 1.1rem;
            border-radius: var(--radius-sm);
        }

        /* 对比列表 */
        .compare-list {
            list-style: none;
            padding: 0;
        }
        .compare-list li {
            padding: 8px 0;
            padding-left: 22px;
            position: relative;
            color: #d0d4db;
            font-size: 0.9rem;
            line-height: 1.6;
        }
        .compare-list li::before {
            content: '';
            position: absolute;
            left: 0;
            top: 14px;
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--accent);
            transform: translateY(-50%);
        }

        /* 页脚链接 */
        .footer-link {
            color: #7a7f8a;
            font-size: 0.875rem;
            transition: color var(--transition-fast);
            display: inline-block;
            padding: 3px 0;
        }
        .footer-link:hover {
            color: var(--accent);
        }