/* roulang page: index */
:root {
            --primary-red: #C8102E;
            --primary-red-dark: #A00D24;
            --primary-red-light: rgba(200, 16, 46, 0.08);
            --accent-gold: #D4AF37;
            --accent-gold-light: rgba(212, 175, 55, 0.2);
            --black-dark: #1A1A1A;
            --black-footer: #0D0D0D;
            --gray-warm: #F5F3EF;
            --card-bg: #FFFFFF;
            --text-dark: #1A1A1A;
            --text-body: #333333;
            --text-muted: #666666;
            --text-light: #999999;
            --white: #FFFFFF;
            --border-light: #E5E5E5;
            --shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
            --shadow-nav: 0 2px 10px rgba(0, 0, 0, 0.05);
            --radius-md: 12px;
            --radius-btn: 8px;
            --radius-full: 50px;
            --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
            --font-number: "Inter", "Roboto", sans-serif;
            --transition: 0.3s ease;
            --max-width: 1200px;
            --nav-height: 72px;
        }

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

        html {
            scroll-behavior: smooth;
            scroll-padding-top: var(--nav-height);
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            font-weight: 400;
            line-height: 1.7;
            color: var(--text-body);
            background-color: var(--gray-warm);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

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

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

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

        button {
            cursor: pointer;
            transition: all var(--transition);
        }

        ul, ol {
            list-style: none;
        }

        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 导航 */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--nav-height);
            background: var(--white);
            z-index: 1000;
            transition: box-shadow var(--transition), background var(--transition);
            display: flex;
            align-items: center;
        }

        .header.scrolled {
            box-shadow: var(--shadow-nav);
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(10px);
        }

        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }

        .logo {
            display: flex;
            align-items: baseline;
            gap: 4px;
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--primary-red);
            letter-spacing: -0.5px;
            white-space: nowrap;
        }

        .logo span {
            color: var(--black-dark);
            font-weight: 600;
            font-size: 0.9rem;
            margin-left: 2px;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 28px;
        }

        .nav-links a {
            color: var(--text-dark);
            font-weight: 500;
            font-size: 0.95rem;
            position: relative;
            padding-bottom: 6px;
            white-space: nowrap;
        }

        .nav-links a.active {
            color: var(--primary-red);
        }

        .nav-links a::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: var(--accent-gold);
            border-radius: 2px;
            transition: width var(--transition);
        }

        .nav-links a:hover::after,
        .nav-links a.active::after {
            width: 100%;
        }

        .btn-nav {
            background: var(--primary-red);
            color: var(--accent-gold);
            padding: 10px 22px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 0.9rem;
            white-space: nowrap;
            letter-spacing: 0.3px;
        }

        .btn-nav:hover {
            background: var(--primary-red-dark);
            color: var(--white);
        }

        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            z-index: 1100;
        }

        .hamburger span {
            width: 26px;
            height: 2.5px;
            background: var(--black-dark);
            border-radius: 2px;
            transition: all var(--transition);
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100vh;
            background: var(--black-dark);
            z-index: 1050;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 32px;
        }

        .mobile-menu.open {
            display: flex;
        }

        .mobile-menu a {
            color: var(--white);
            font-size: 1.4rem;
            font-weight: 500;
            letter-spacing: 0.5px;
        }

        .mobile-close {
            position: absolute;
            top: 24px;
            right: 24px;
            font-size: 2rem;
            color: var(--white);
            cursor: pointer;
            background: none;
            border: none;
        }

        @media (max-width: 768px) {
            .nav-links, .btn-nav.desktop-only {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .btn-nav.mobile-show {
                display: inline-block;
                background: transparent;
                color: var(--accent-gold);
                border: 1px solid var(--accent-gold);
                padding: 8px 20px;
            }
        }

        /* Hero Section */
        .hero {
            background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            position: relative;
            min-height: 90vh;
            display: flex;
            align-items: center;
            margin-top: var(--nav-height);
        }

        .hero::before {
            content: "";
            position: absolute;
            top: 0; left: 0;
            width: 100%; height: 100%;
            background: linear-gradient(135deg, rgba(26, 26, 26, 0.85) 0%, rgba(26, 26, 26, 0.5) 60%, rgba(26, 26, 26, 0.7) 100%);
            z-index: 1;
        }

        .hero .container {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 40px;
            align-items: center;
            width: 100%;
        }

        .hero-content {
            color: var(--white);
        }

        .hero h1 {
            font-size: 3.2rem;
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: 20px;
            letter-spacing: -1px;
            color: var(--white);
        }

        .hero h1 .gold {
            color: var(--accent-gold);
        }

        .hero-subtitle {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.85);
            margin-bottom: 32px;
            line-height: 1.6;
            max-width: 480px;
        }

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

        .btn-primary {
            background: var(--primary-red);
            color: var(--accent-gold);
            padding: 14px 32px;
            border-radius: var(--radius-btn);
            font-weight: 700;
            font-size: 1rem;
            letter-spacing: 0.5px;
            box-shadow: 0 4px 12px rgba(200, 16, 46, 0.3);
        }

        .btn-primary:hover {
            background: var(--primary-red-dark);
            color: var(--white);
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(200, 16, 46, 0.4);
        }

        .btn-outline {
            background: transparent;
            border: 2px solid var(--accent-gold);
            color: var(--accent-gold);
            padding: 12px 30px;
            border-radius: var(--radius-btn);
            font-weight: 600;
        }

        .btn-outline:hover {
            background: var(--accent-gold-light);
            color: var(--white);
            border-color: var(--white);
        }

        .hero-trust {
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .hero-trust strong {
            color: var(--accent-gold);
            font-family: var(--font-number);
            font-size: 1.4rem;
            font-weight: 700;
        }

        .hero-visual {
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .hero-img-placeholder {
            width: 100%;
            aspect-ratio: 4/3;
            background: url('/assets/images/coverpic/cover-1.webp') center/cover no-repeat;
            border-radius: var(--radius-md);
            box-shadow: 0 20px 40px rgba(0,0,0,0.3);
            border: 1px solid rgba(212, 175, 55, 0.3);
        }

        @media (max-width: 1024px) {
            .hero .container {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .hero-subtitle { max-width: 100%; }
            .hero-buttons { justify-content: center; }
            .hero-visual { display: none; }
            .hero h1 { font-size: 2.4rem; }
        }

        @media (max-width: 520px) {
            .hero h1 { font-size: 1.8rem; }
        }

        /* Stats Section */
        .stats-section {
            background: var(--black-dark);
            padding: 60px 0;
            color: var(--white);
        }

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

        .stat-item .stat-number {
            font-family: var(--font-number);
            font-size: 2.8rem;
            font-weight: 700;
            color: var(--accent-gold);
            display: block;
            margin-bottom: 8px;
        }

        .stat-label {
            color: rgba(255,255,255,0.7);
            font-size: 0.95rem;
            letter-spacing: 0.3px;
        }

        @media (max-width: 768px) {
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }

        /* Features Section */
        .features-section {
            background: var(--gray-warm);
            padding: 80px 0;
        }

        .section-title {
            text-align: center;
            font-size: 2.2rem;
            font-weight: 600;
            color: var(--black-dark);
            margin-bottom: 48px;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 12px;
        }

        .section-title::before {
            content: "";
            width: 6px;
            height: 36px;
            background: var(--accent-gold);
            border-radius: 3px;
        }

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

        .feature-card {
            background: var(--card-bg);
            padding: 32px;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            display: flex;
            gap: 20px;
            align-items: flex-start;
            transition: all var(--transition);
        }

        .feature-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }

        .feature-icon {
            width: 52px;
            height: 52px;
            background: var(--primary-red);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--white);
            font-size: 1.4rem;
            flex-shrink: 0;
        }

        .feature-text h3 {
            font-size: 1.25rem;
            font-weight: 600;
            color: var(--black-dark);
            margin-bottom: 8px;
        }

        .feature-text p {
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.6;
        }

        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .features-grid {
                grid-template-columns: 1fr;
            }
        }

        /* Comparison */
        .comparison-section {
            background: var(--white);
            padding: 80px 0;
        }

        .comparison-table {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 0;
            max-width: 800px;
            margin: 0 auto;
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }

        .comp-col {
            padding: 32px;
        }

        .comp-col.left {
            background: #F0F0F0;
            color: var(--text-muted);
        }

        .comp-col.right {
            background: var(--card-bg);
            border-left: 2px solid var(--accent-gold);
        }

        .comp-header {
            font-size: 1.2rem;
            font-weight: 600;
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .comp-row {
            display: flex;
            justify-content: space-between;
            padding: 12px 0;
            border-bottom: 1px solid #eee;
            font-size: 0.95rem;
        }

        .comp-row i {
            font-size: 1.2rem;
        }

        .gold-check {
            color: var(--accent-gold);
        }
        .gray-cross {
            color: #AAAAAA;
        }
        .comp-note {
            text-align: center;
            color: var(--text-muted);
            font-size: 0.8rem;
            margin-top: 16px;
        }

        @media (max-width: 640px) {
            .comparison-table {
                grid-template-columns: 1fr;
            }
            .comp-col.right {
                border-left: none;
                border-top: 2px solid var(--accent-gold);
            }
        }

        /* FAQ */
        .faq-section {
            background: var(--gray-warm);
            padding: 80px 0;
        }

        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--card-bg);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            box-shadow: var(--shadow-sm);
            overflow: hidden;
        }

        .faq-question {
            padding: 20px 24px;
            font-weight: 600;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            color: var(--black-dark);
        }

        .faq-icon {
            color: var(--primary-red);
            font-size: 1.2rem;
            transition: transform 0.2s;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            background: var(--white);
            padding: 0 24px;
            color: var(--text-body);
            line-height: 1.6;
        }

        .faq-item.open .faq-answer {
            max-height: 200px;
            padding: 0 24px 20px;
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }

        /* CTA */
        .cta-section {
            background: var(--black-dark);
            padding: 80px 0;
            text-align: center;
            color: var(--white);
        }

        .cta-form {
            display: flex;
            max-width: 480px;
            margin: 24px auto 0;
            gap: 8px;
        }

        .cta-input {
            flex: 1;
            padding: 14px 16px;
            border-radius: var(--radius-btn);
            background: var(--white);
            color: var(--text-dark);
            font-size: 1rem;
        }

        .btn-cta {
            background: var(--primary-red);
            color: var(--accent-gold);
            font-weight: 700;
            padding: 0 28px;
            border-radius: var(--radius-btn);
            white-space: nowrap;
        }

        .privacy-note {
            font-size: 0.75rem;
            color: rgba(255,255,255,0.5);
            margin-top: 12px;
        }

        @media (max-width: 520px) {
            .cta-form {
                flex-direction: column;
            }
            .btn-cta {
                padding: 14px;
            }
        }

        /* Footer */
        .footer {
            background: var(--black-footer);
            color: rgba(255,255,255,0.6);
            padding: 60px 0 24px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer h4 {
            color: var(--white);
            font-weight: 600;
            margin-bottom: 16px;
        }

        .footer a {
            display: block;
            color: rgba(255,255,255,0.5);
            margin-bottom: 8px;
        }

        .footer a:hover {
            color: var(--accent-gold);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 20px;
            text-align: center;
            font-size: 0.8rem;
        }

        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }