/* roulang page: index */
:root {
            --color-brand: #0D1B1E;
            --color-bg: #F5F2EB;
            --color-accent: #FF4A1C;
            --color-accent-deep: #D93A0F;
            --color-secondary: #00B4A6;
            --color-secondary-deep: #009A8E;
            --color-text: #2C2C2C;
            --color-text-light: #5A5A5A;
            --color-muted: #8C8C8C;
            --color-border: #D9D5CC;
            --color-card-bg: #FFFFFF;
            --color-dark-bg: #0D1B1E;
            --color-dark-text: #F5F2EB;
            --color-dark-divider: rgba(245, 242, 235, 0.2);
            --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
            --font-mono: "SF Mono", "Fira Code", "DIN Alternate", "PingFang SC", monospace;
            --radius-card: 6px;
            --radius-btn: 4px;
            --radius-img: 4px;
            --shadow-card: 0 4px 24px rgba(13, 27, 30, 0.07);
            --shadow-card-hover: 0 8px 36px rgba(13, 27, 30, 0.12);
            --shadow-nav: 0 1px 0 rgba(13, 27, 30, 0.06);
            --shadow-card-expanded: 0 4px 20px rgba(13, 27, 30, 0.08);
            --transition-default: all 0.2s ease;
            --transition-slow: all 0.25s ease;
            --max-width: 1200px;
            --nav-height-mobile: 56px;
            --nav-height-desktop: 64px;
        }

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

        html {
            scroll-behavior: smooth;
            scroll-padding-top: var(--nav-height-desktop);
            -webkit-text-size-adjust: 100%;
            text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-sans);
            font-size: 1rem;
            line-height: 1.7;
            font-weight: 400;
            color: var(--color-text);
            background-color: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            min-height: 100vh;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition-default);
        }
        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
            font-size: inherit;
        }
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }
        ul,
        ol {
            list-style: none;
        }

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

        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding-left: clamp(1rem, 4vw, 2rem);
            padding-right: clamp(1rem, 4vw, 2rem);
        }

        .section-padding {
            padding-top: clamp(3rem, 8vh, 6rem);
            padding-bottom: clamp(3rem, 8vh, 6rem);
        }

        /* ========== NAVIGATION ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: #FFFFFF;
            border-bottom: 1px solid var(--color-border);
            box-shadow: var(--shadow-nav);
            height: var(--nav-height-mobile);
            transition: var(--transition-default);
            display: flex;
            align-items: center;
        }
        @media (min-width: 1024px) {
            .site-header {
                height: var(--nav-height-desktop);
            }
            html {
                scroll-padding-top: var(--nav-height-desktop);
            }
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding-left: clamp(1rem, 4vw, 2rem);
            padding-right: clamp(1rem, 4vw, 2rem);
            height: 100%;
        }
        .logo {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--color-brand);
            letter-spacing: -0.01em;
            white-space: nowrap;
            flex-shrink: 0;
            z-index: 1001;
        }
        .logo a {
            color: var(--color-brand);
        }
        .logo a:hover {
            color: var(--color-accent);
        }
        .nav-links {
            display: none;
            gap: clamp(1rem, 2.5vw, 1.8rem);
            align-items: center;
            flex-shrink: 0;
        }
        @media (min-width: 1024px) {
            .nav-links {
                display: flex;
            }
        }
        .nav-links a {
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--color-text);
            position: relative;
            padding: 0.3rem 0;
            white-space: nowrap;
            letter-spacing: 0.01em;
        }
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--color-accent);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.2s ease;
        }
        .nav-links a:hover {
            color: var(--color-accent);
        }
        .nav-links a:hover::after,
        .nav-links a.active::after {
            transform: scaleX(1);
        }
        .nav-links a.active {
            color: var(--color-accent);
        }
        .nav-cta {
            display: none;
            flex-shrink: 0;
        }
        @media (min-width: 1024px) {
            .nav-cta {
                display: inline-flex;
            }
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--color-accent);
            color: #FFFFFF;
            font-weight: 600;
            font-size: 0.9rem;
            letter-spacing: 0.04em;
            padding: 0.5rem 1.3rem;
            border-radius: var(--radius-btn);
            transition: var(--transition-default);
            white-space: nowrap;
            cursor: pointer;
            border: none;
            text-align: center;
            line-height: 1.4;
        }
        .btn-primary:hover {
            background: var(--color-accent-deep);
            transform: translateY(-1px);
            box-shadow: 0 4px 16px rgba(255, 74, 28, 0.3);
            color: #FFFFFF;
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: none;
        }

        .btn-outline-light {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: transparent;
            color: var(--color-dark-text);
            border: 1.5px solid rgba(245, 242, 235, 0.6);
            font-weight: 600;
            font-size: 0.9rem;
            letter-spacing: 0.04em;
            padding: 0.6rem 1.6rem;
            border-radius: var(--radius-btn);
            transition: var(--transition-default);
            white-space: nowrap;
            cursor: pointer;
            text-align: center;
            line-height: 1.4;
        }
        .btn-outline-light:hover {
            background: var(--color-accent);
            border-color: var(--color-accent);
            color: #FFFFFF;
            transform: translateY(-1px);
            box-shadow: 0 4px 16px rgba(255, 74, 28, 0.35);
        }

        .btn-outline-dark {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: transparent;
            color: var(--color-brand);
            border: 1.5px solid var(--color-brand);
            font-weight: 600;
            font-size: 0.9rem;
            letter-spacing: 0.04em;
            padding: 0.6rem 1.6rem;
            border-radius: var(--radius-btn);
            transition: var(--transition-default);
            white-space: nowrap;
            cursor: pointer;
            text-align: center;
            line-height: 1.4;
        }
        .btn-outline-dark:hover {
            background: var(--color-brand);
            color: #FFFFFF;
            transform: translateY(-1px);
        }

        .hamburger {
            display: flex;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            z-index: 1001;
            padding: 6px;
            flex-shrink: 0;
        }
        @media (min-width: 1024px) {
            .hamburger {
                display: none;
            }
        }
        .hamburger span {
            display: block;
            width: 24px;
            height: 2.5px;
            background: var(--color-brand);
            border-radius: 2px;
            transition: var(--transition-slow);
            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 {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100vh;
            background: #FFFFFF;
            z-index: 999;
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            justify-content: center;
            padding: 2rem;
            gap: 1.8rem;
            transform: translateY(-100%);
            transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            pointer-events: none;
        }
        .mobile-menu.open {
            transform: translateY(0);
            pointer-events: auto;
        }
        .mobile-menu a {
            font-size: 1.3rem;
            font-weight: 600;
            color: var(--color-brand);
            letter-spacing: 0.02em;
            transition: var(--transition-default);
        }
        .mobile-menu a:hover {
            color: var(--color-accent);
        }
        .mobile-menu .btn-primary {
            margin-top: 0.8rem;
            font-size: 1rem;
            padding: 0.7rem 2rem;
        }

        /* ========== HERO ========== */
        #hero {
            background: var(--color-bg);
            overflow: hidden;
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: clamp(2rem, 5vw, 4rem);
            align-items: center;
        }
        @media (min-width: 1024px) {
            .hero-grid {
                grid-template-columns: 55fr 45fr;
            }
        }
        .hero-left {
            display: flex;
            flex-direction: column;
            gap: 1.4rem;
            align-items: flex-start;
        }
        .hero-left h1 {
            font-size: clamp(2.25rem, 5vw, 3.75rem);
            font-weight: 700;
            line-height: 1.15;
            letter-spacing: -0.02em;
            color: var(--color-brand);
            margin: 0;
        }
        .hero-left .hero-subtitle {
            font-size: 1.1rem;
            line-height: 1.7;
            color: var(--color-text-light);
            max-width: 480px;
            margin: 0;
        }
        .hero-cta-group {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 1rem;
            margin-top: 0.4rem;
        }
        .hero-cta-group .btn-primary {
            font-size: 1rem;
            padding: 0.7rem 2rem;
            letter-spacing: 0.05em;
        }
        .hero-cta-group .link-arrow {
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--color-secondary);
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
            transition: var(--transition-default);
            letter-spacing: 0.02em;
        }
        .hero-cta-group .link-arrow:hover {
            color: var(--color-secondary-deep);
            gap: 0.6rem;
        }
        .link-arrow .arrow-icon {
            display: inline-block;
            transition: var(--transition-default);
            font-size: 1.1em;
            line-height: 1;
        }
        .hero-right {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 100%;
        }
        .hero-visual-wrap {
            width: 100%;
            max-width: 500px;
            aspect-ratio: 4 / 3;
            background: #ECE9E2;
            border-radius: var(--radius-img);
            overflow: hidden;
            position: relative;
            box-shadow: var(--shadow-card);
        }
        .hero-visual-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
        }
        @media (min-width: 1024px) {
            .hero-visual-wrap {
                aspect-ratio: 3 / 4;
                max-width: 420px;
            }
        }

        /* ========== HIGHLIGHTS ========== */
        #highlights {
            background: var(--color-bg);
        }
        .section-title {
            font-size: clamp(1.6rem, 3.5vw, 2.2rem);
            font-weight: 650;
            line-height: 1.25;
            letter-spacing: -0.01em;
            color: var(--color-brand);
            text-align: center;
            margin-bottom: clamp(2rem, 4vh, 3rem);
        }
        .highlights-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1.5rem;
        }
        @media (min-width: 640px) {
            .highlights-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 2rem;
            }
        }
        @media (min-width: 1024px) {
            .highlights-grid {
                grid-template-columns: repeat(4, 1fr);
                gap: 2rem;
            }
        }
        .highlight-card {
            background: var(--color-card-bg);
            border-radius: var(--radius-card);
            padding: clamp(1.5rem, 3vw, 2rem);
            text-align: center;
            box-shadow: none;
            transition: var(--transition-default);
            border: 1px solid transparent;
        }
        .highlight-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-card-hover);
            border-color: #ECE9E2;
        }
        .highlight-card .hl-icon {
            width: 48px;
            height: 48px;
            margin: 0 auto 1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-secondary);
        }
        .highlight-card .hl-icon svg {
            width: 32px;
            height: 32px;
        }
        .highlight-card h3 {
            font-size: 1.1rem;
            font-weight: 600;
            line-height: 1.4;
            color: var(--color-brand);
            margin-bottom: 0.5rem;
        }
        .highlight-card p {
            font-size: 0.9rem;
            line-height: 1.6;
            color: var(--color-text-light);
            margin: 0;
        }

        /* ========== SHOWCASE (深色反转) ========== */
        #showcase {
            background: var(--color-dark-bg);
            color: var(--color-dark-text);
        }
        #showcase .section-title {
            color: var(--color-dark-text);
        }
        .showcase-list {
            display: flex;
            flex-direction: column;
            gap: 0;
        }
        .showcase-card {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1.2rem;
            padding: clamp(1.8rem, 4vw, 2.5rem) 0;
            border-bottom: 1px solid var(--color-dark-divider);
            align-items: center;
            transition: var(--transition-default);
        }
        .showcase-card:last-child {
            border-bottom: none;
        }
        @media (min-width: 768px) {
            .showcase-card {
                grid-template-columns: 200px 1fr;
                gap: 2rem;
            }
        }
        @media (min-width: 1024px) {
            .showcase-card {
                grid-template-columns: 240px 1fr;
                gap: 2.5rem;
            }
        }
        .showcase-card-left {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
        }
        .showcase-card-left img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            border-radius: var(--radius-img);
            display: block;
        }
        .showcase-data {
            font-family: var(--font-mono);
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--color-secondary);
            letter-spacing: -0.02em;
            line-height: 1;
        }
        .showcase-tag {
            display: inline-block;
            border: 1px solid var(--color-accent);
            color: var(--color-accent);
            font-size: 0.75rem;
            font-weight: 500;
            letter-spacing: 0.04em;
            text-transform: uppercase;
            padding: 0.25rem 0.7rem;
            border-radius: 3px;
            width: fit-content;
            white-space: nowrap;
        }
        .showcase-card-right {
            display: flex;
            flex-direction: column;
            gap: 0.6rem;
        }
        .showcase-card-right h3 {
            font-size: 1.2rem;
            font-weight: 600;
            line-height: 1.3;
            color: var(--color-dark-text);
            margin: 0;
        }
        .showcase-card-right p {
            font-size: 0.95rem;
            line-height: 1.6;
            color: rgba(245, 242, 235, 0.75);
            margin: 0;
        }
        .showcase-card-right .link-arrow {
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--color-secondary);
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
            transition: var(--transition-default);
            letter-spacing: 0.02em;
            width: fit-content;
        }
        .showcase-card-right .link-arrow:hover {
            color: #FFFFFF;
            gap: 0.55rem;
        }

        /* ========== COMPARE ========== */
        #compare {
            background: var(--color-bg);
        }
        .compare-wrapper {
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            scroll-snap-type: x proximity;
            padding-bottom: 0.5rem;
            margin: 0 -1rem;
            padding-left: 1rem;
            padding-right: 1rem;
        }
        @media (min-width: 768px) {
            .compare-wrapper {
                overflow-x: visible;
                margin: 0;
                padding-left: 0;
                padding-right: 0;
                scroll-snap-type: none;
            }
        }
        .compare-table {
            display: grid;
            grid-template-columns: repeat(3, 260px);
            gap: 0;
            min-width: max-content;
            scroll-snap-align: start;
        }
        @media (min-width: 768px) {
            .compare-table {
                grid-template-columns: repeat(3, 1fr);
                min-width: unset;
                gap: 1.5rem;
            }
        }
        @media (min-width: 1024px) {
            .compare-table {
                gap: 2rem;
            }
        }
        .compare-col {
            background: var(--color-card-bg);
            border-radius: var(--radius-card);
            padding: clamp(1.5rem, 3vw, 2.2rem);
            display: flex;
            flex-direction: column;
            gap: 1rem;
            border: 1px solid transparent;
            transition: var(--transition-default);
            position: relative;
            box-shadow: none;
        }
        .compare-col.featured {
            border-top: 3px solid var(--color-accent);
            box-shadow: var(--shadow-card);
            z-index: 1;
        }
        .compare-col:hover {
            box-shadow: var(--shadow-card-hover);
        }
        .compare-col.featured:hover {
            box-shadow: var(--shadow-card-hover);
        }
        .compare-col h3 {
            font-size: 1.15rem;
            font-weight: 650;
            color: var(--color-brand);
            text-align: center;
            margin: 0;
        }
        .compare-col .compare-badge {
            text-align: center;
            font-size: 0.7rem;
            font-weight: 600;
            letter-spacing: 0.06em;
            text-transform: uppercase;
            color: var(--color-accent);
            background: rgba(255, 74, 28, 0.08);
            padding: 0.2rem 0.8rem;
            border-radius: 20px;
            width: fit-content;
            margin: 0 auto;
            white-space: nowrap;
        }
        .compare-rows {
            display: flex;
            flex-direction: column;
            gap: 0.7rem;
            flex: 1;
        }
        .compare-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 0.6rem;
            font-size: 0.9rem;
            padding: 0.4rem 0;
            border-bottom: 1px solid #f0ede6;
            color: var(--color-text);
        }
        .compare-row:last-child {
            border-bottom: none;
        }
        .compare-row .check {
            color: var(--color-secondary);
            font-weight: 700;
            font-size: 1.1rem;
            flex-shrink: 0;
        }
        .compare-row .cross {
            color: #c5c0b6;
            font-weight: 400;
            font-size: 1rem;
            flex-shrink: 0;
        }
        .compare-col .btn-wrap {
            margin-top: auto;
            padding-top: 1rem;
            text-align: center;
        }
        .compare-col .btn-wrap .btn-primary {
            width: 100%;
            padding: 0.65rem 1rem;
            font-size: 0.9rem;
        }
        .compare-col .btn-wrap .btn-outline-dark {
            width: 100%;
            padding: 0.65rem 1rem;
            font-size: 0.9rem;
        }

        /* ========== FAQ ========== */
        #faq {
            background: var(--color-bg);
        }
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--color-card-bg);
            border-radius: var(--radius-card);
            overflow: hidden;
            transition: var(--transition-default);
            box-shadow: none;
            border: 1px solid transparent;
        }
        .faq-item[open] {
            box-shadow: var(--shadow-card-expanded);
            border-color: #ECE9E2;
        }
        .faq-item summary {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 1.2rem 1.5rem;
            cursor: pointer;
            font-weight: 600;
            color: var(--color-brand);
            font-size: 1rem;
            line-height: 1.5;
            list-style: none;
            gap: 1rem;
            user-select: none;
            transition: var(--transition-default);
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary::marker {
            display: none;
        }
        .faq-item summary:hover {
            color: var(--color-accent);
        }
        .faq-icon {
            flex-shrink: 0;
            width: 22px;
            height: 22px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-secondary);
            transition: transform 0.25s ease;
            font-size: 1.3rem;
            line-height: 1;
            font-weight: 400;
        }
        .faq-item[open] .faq-icon {
            transform: rotate(45deg);
        }
        .faq-answer {
            padding: 0 1.5rem 1.3rem;
            color: var(--color-text-light);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-cta-mini {
            text-align: center;
            margin-top: 2rem;
        }
        .faq-cta-mini .link-arrow {
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--color-secondary);
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
            transition: var(--transition-default);
            letter-spacing: 0.02em;
        }
        .faq-cta-mini .link-arrow:hover {
            color: var(--color-accent);
            gap: 0.6rem;
        }

        /* ========== FOOTER / CONTACT ========== */
        #contact {
            background: var(--color-dark-bg);
            color: var(--color-dark-text);
            text-align: center;
        }
        .footer-inner {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 1.5rem;
        }
        .footer-inner .footer-heading {
            font-size: 1.4rem;
            font-weight: 650;
            color: var(--color-dark-text);
            letter-spacing: -0.01em;
            margin: 0;
            line-height: 1.3;
        }
        .footer-inner .footer-sub {
            font-size: 1rem;
            color: rgba(245, 242, 235, 0.7);
            max-width: 500px;
            line-height: 1.6;
            margin: 0;
        }
        .footer-btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            justify-content: center;
        }
        .footer-bottom {
            margin-top: 2.5rem;
            padding-top: 1.5rem;
            border-top: 1px solid var(--color-dark-divider);
            width: 100%;
            max-width: var(--max-width);
            text-align: center;
        }
        .footer-bottom p {
            font-size: 0.75rem;
            color: var(--color-muted);
            margin: 0;
            line-height: 1.6;
        }
        .footer-bottom a {
            color: var(--color-muted);
            transition: var(--transition-default);
        }
        .footer-bottom a:hover {
            color: var(--color-dark-text);
        }

        /* ========== COUNT-UP ANIMATION ========== */
        @keyframes countPulse {
            0%,
            100% {
                opacity: 1;
            }
            50% {
                opacity: 0.7;
            }
        }
        .count-up {
            animation: countPulse 2s ease-in-out 1;
            animation-delay: 0.3s;
            animation-fill-mode: backwards;
        }

        /* ========== PARALLAX SUBTLE (desktop) ========== */
        @media (min-width: 1024px) {
            .hero-visual-wrap {
                transition: transform 0.1s ease-out;
            }
        }

        /* ========== RESPONSIVE ADJUSTMENTS ========== */
        @media (max-width: 639px) {
            .hero-left {
                align-items: center;
                text-align: center;
            }
            .hero-left .hero-subtitle {
                max-width: 100%;
            }
            .hero-cta-group {
                justify-content: center;
            }
            .hero-visual-wrap {
                max-width: 100%;
                aspect-ratio: 16 / 10;
            }
            .compare-wrapper {
                margin: 0 -0.5rem;
                padding-left: 0.5rem;
                padding-right: 0.5rem;
            }
            .compare-table {
                grid-template-columns: repeat(3, 240px);
                gap: 0.6rem;
            }
            .showcase-card {
                text-align: left;
            }
            .showcase-card-left {
                align-items: flex-start;
            }
        }
        @media (min-width: 640px) and (max-width: 1023px) {
            .hero-left {
                align-items: flex-start;
                text-align: left;
            }
            .compare-wrapper {
                margin: 0;
                padding-left: 0;
                padding-right: 0;
            }
            .compare-table {
                grid-template-columns: repeat(3, 1fr);
                min-width: unset;
                gap: 1rem;
            }
            .compare-col {
                padding: 1.2rem;
            }
        }