/* roulang page: index */
:root {
            --color-deep: #1c1c1e;
            --color-deep-alt: #252527;
            --color-deep-footer: #161618;
            --color-amber-gold: #c8963e;
            --color-amber-light: #e0b860;
            --color-light-bg: #f7f5f2;
            --color-white: #ffffff;
            --color-text-weak-dark: #b0b0b0;
            --color-text-muted-dark: #6e6e6e;
            --color-text-strong-light: #1c1c1e;
            --color-text-body-light: #3a3a3c;
            --color-text-weak-light: #8e8e8e;
            --border-dark: rgba(255, 255, 255, 0.08);
            --border-light: rgba(0, 0, 0, 0.06);
            --radius-xl: 12px;
            --radius-2xl: 16px;
            --shadow-card-dark: 0 8px 32px rgba(0, 0, 0, 0.35), 0 2px 8px rgba(180, 130, 50, 0.06);
            --shadow-card-light: 0 2px 16px rgba(0, 0, 0, 0.05), 0 1px 4px rgba(0, 0, 0, 0.04);
            --shadow-card-hover: 0 14px 40px rgba(0, 0, 0, 0.45), 0 4px 14px rgba(180, 130, 50, 0.1);
            --shadow-card-light-hover: 0 8px 28px rgba(0, 0, 0, 0.1), 0 3px 10px rgba(0, 0, 0, 0.06);
            --transition-fast: 200ms ease-out;
            --transition-smooth: 300ms ease-out;
        }

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

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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
            line-height: 1.7;
            background-color: var(--color-deep);
            color: var(--color-text-weak-dark);
            margin: 0;
            padding: 0;
            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 {
            font-family: inherit;
        }

        /* 滚动条隐藏 */
        .scrollbar-hide::-webkit-scrollbar {
            display: none;
        }
        .scrollbar-hide {
            -ms-overflow-style: none;
            scrollbar-width: none;
        }

        /* 导航固定 */
        .nav-sticky {
            position: sticky;
            top: 0;
            z-index: 50;
        }

        /* 按钮光泽扫过 */
        .btn-shimmer {
            position: relative;
            overflow: hidden;
        }
        .btn-shimmer::after {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.18), transparent);
            transition: left 0.55s ease-out;
            pointer-events: none;
        }
        .btn-shimmer:hover::after {
            left: 100%;
        }

        /* 链接下划线滑入 */
        .link-underline {
            position: relative;
        }
        .link-underline::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 1.5px;
            background-color: var(--color-amber-gold);
            transition: width var(--transition-smooth);
        }
        .link-underline:hover::after {
            width: 100%;
        }

        /* FAQ手风琴 */
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease-out, padding-top 0.4s ease-out;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding-top: 0.75rem;
        }
        .faq-icon {
            transition: transform var(--transition-smooth);
            display: inline-block;
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }

        /* 卡片hover微抬 */
        .card-lift {
            transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
        }
        .card-lift:hover {
            transform: translateY(-4px);
        }

        /* 滚动进入动画 */
        .reveal-section {
            opacity: 0;
            transform: translateY(24px);
            transition: opacity 0.7s ease-out, transform 0.7s ease-out;
        }
        .reveal-section.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* 案例瀑布流 - CSS columns */
        .masonry-grid {
            column-count: 3;
            column-gap: 1.5rem;
        }
        .masonry-grid .masonry-item {
            break-inside: avoid;
            margin-bottom: 1.5rem;
        }
        @media (max-width: 1023px) {
            .masonry-grid {
                column-count: 2;
                column-gap: 1.25rem;
            }
            .masonry-grid .masonry-item {
                margin-bottom: 1.25rem;
            }
        }
        @media (max-width: 639px) {
            .masonry-grid {
                column-count: 1;
                column-gap: 0;
            }
            .masonry-grid .masonry-item {
                margin-bottom: 1rem;
            }
        }

        /* 汉堡菜单 */
        .mobile-menu {
            position: fixed;
            top: 0;
            right: 0;
            width: 280px;
            max-width: 85vw;
            height: 100vh;
            background-color: #1a1a1d;
            z-index: 60;
            transform: translateX(100%);
            transition: transform 0.35s ease-out;
            box-shadow: -8px 0 32px rgba(0, 0, 0, 0.5);
            padding: 1.5rem;
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }
        .mobile-menu.open {
            transform: translateX(0);
        }
        .mobile-menu-overlay {
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.65);
            z-index: 55;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.35s ease-out;
        }
        .mobile-menu-overlay.active {
            opacity: 1;
            pointer-events: auto;
        }
        .mobile-menu a {
            display: block;
            padding: 0.75rem 1rem;
            color: #cccccc;
            font-size: 1rem;
            font-weight: 500;
            border-radius: 8px;
            transition: all var(--transition-fast);
        }
        .mobile-menu a:hover,
        .mobile-menu a.active-mobile {
            color: var(--color-amber-gold);
            background: rgba(200, 150, 62, 0.08);
        }

        /* 导航pill标签 */
        .nav-pill {
            display: inline-block;
            padding: 0.4rem 1rem;
            border-radius: 9999px;
            font-size: 0.875rem;
            font-weight: 500;
            letter-spacing: 0.03em;
            white-space: nowrap;
            transition: all var(--transition-fast);
            border: 1px solid transparent;
            color: #b0b0b0;
        }
        .nav-pill:hover {
            color: #e0e0e0;
            border-color: rgba(255, 255, 255, 0.25);
        }
        .nav-pill.active-pill {
            background-color: var(--color-amber-gold);
            color: #1c1c1e;
            border-color: var(--color-amber-gold);
            font-weight: 600;
        }

        /* FAQ竖线锚点 */
        .faq-anchor-bar {
            width: 3px;
            height: 18px;
            background-color: var(--color-amber-gold);
            border-radius: 2px;
            flex-shrink: 0;
            margin-right: 12px;
        }

        /* 表单输入框 */
        .form-input-dark {
            background-color: #252527;
            border: 1px solid rgba(255, 255, 255, 0.15);
            color: #ffffff;
            padding: 0.75rem 1rem;
            border-radius: 8px;
            width: 100%;
            font-size: 0.95rem;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
            outline: none;
        }
        .form-input-dark:focus {
            border-color: var(--color-amber-gold);
            box-shadow: 0 0 0 3px rgba(200, 150, 62, 0.12);
        }
        .form-input-dark::placeholder {
            color: #6e6e6e;
        }

        /* 方案对比高亮列 */
        .compare-highlight {
            background-color: #2a2a2d;
            border-top: 2px solid var(--color-amber-gold);
        }

        @media (max-width: 767px) {
            .compare-table-row {
                display: flex;
                flex-direction: column;
                border: 1px solid rgba(255, 255, 255, 0.08);
                border-radius: 12px;
                padding: 1rem;
                background-color: #252527;
                margin-bottom: 0.75rem;
            }
            .compare-table-row .compare-label {
                font-weight: 600;
                color: #ffffff;
                margin-bottom: 0.5rem;
                font-size: 0.9rem;
            }
            .compare-table-row .compare-cells {
                display: flex;
                gap: 0.75rem;
            }
            .compare-table-row .compare-cell {
                flex: 1;
                font-size: 0.85rem;
            }
        }