/* roulang page: index */
:root {
            --primary: #0A3D2E;
            --primary-hover: #072E23;
            --accent: #D4A843;
            --accent-light: rgba(212, 168, 67, 0.15);
            --bg: #F7F5F0;
            --card-bg: #FFFFFF;
            --text: #2C2C2C;
            --text-muted: #6B6B6B;
            --case-bg: #EDF1EF;
            --border-radius: 12px;
            --button-radius: 8px;
            --shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
            --container-max: 1280px;
            --section-gap: 120px;
            --font-heading: 'Noto Sans SC', sans-serif;
            --font-number: 'Inter', sans-serif;
            --nav-height: 80px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-heading);
            font-weight: 400;
            font-size: 16px;
            line-height: 1.8;
            color: var(--text);
            background-color: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        h1, h2, h3, h4 {
            font-weight: 700;
            line-height: 1.3;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        button, input {
            font-family: inherit;
            outline: none;
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }
        .section-spacing {
            padding: var(--section-gap) 0;
        }
        .text-accent {
            color: var(--accent);
        }
        .text-muted {
            color: var(--text-muted);
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: 600;
            border-radius: var(--button-radius);
            padding: 14px 32px;
            transition: all 0.3s ease;
            cursor: pointer;
            border: 2px solid transparent;
            font-size: 1rem;
            letter-spacing: 0.5px;
            white-space: nowrap;
        }
        .btn-primary {
            background-color: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }
        .btn-primary:hover {
            background-color: var(--primary-hover);
            border-color: var(--primary-hover);
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(10, 61, 46, 0.3);
        }
        .btn-outline {
            background: transparent;
            border: 2px solid var(--accent);
            color: var(--accent);
        }
        .btn-outline:hover {
            background-color: var(--accent);
            color: var(--primary);
            transform: translateY(-2px);
        }
        .btn-accent {
            background-color: var(--accent);
            color: var(--primary);
            border-color: var(--accent);
        }
        .btn-accent:hover {
            background-color: #c99b32;
            border-color: #c99b32;
            transform: translateY(-2px);
            color: #fff;
            box-shadow: 0 8px 20px rgba(212, 168, 67, 0.4);
        }

        /* Navigation */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 50;
            height: var(--nav-height);
            background: rgba(247, 245, 240, 0.85);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            transition: background 0.3s ease, box-shadow 0.3s ease;
            border-bottom: 1px solid transparent;
        }
        .site-header.scrolled {
            background: rgba(10, 61, 46, 0.95);
            border-bottom: 1px solid rgba(255,255,255,0.1);
            box-shadow: 0 4px 20px rgba(0,0,0,0.1);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo-area {
            display: flex;
            align-items: baseline;
            gap: 6px;
        }
        .logo-text {
            font-family: var(--font-number);
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary);
            transition: color 0.3s;
            letter-spacing: -0.5px;
        }
        .scrolled .logo-text {
            color: var(--accent);
        }
        .logo-domain {
            font-size: 0.8rem;
            color: var(--text-muted);
            font-weight: 400;
            transition: color 0.3s;
            display: inline-block;
        }
        .scrolled .logo-domain {
            color: rgba(212,168,67,0.8);
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 32px;
        }
        .nav-link {
            font-weight: 500;
            font-size: 1rem;
            color: var(--text);
            position: relative;
            padding: 4px 0;
            transition: color 0.3s;
        }
        .scrolled .nav-link {
            color: #fff;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 2px;
            background: var(--accent);
            transition: all 0.3s ease;
            transform: translateX(-50%);
        }
        .nav-link:hover::after,
        .nav-link.active::after {
            width: 100%;
        }
        .nav-link:hover {
            color: var(--accent);
        }
        .scrolled .nav-link:hover {
            color: var(--accent);
        }
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            background: none;
            border: none;
            width: 30px;
            height: 24px;
            justify-content: center;
            z-index: 60;
        }
        .hamburger span {
            display: block;
            height: 2px;
            background: var(--primary);
            transition: 0.3s;
            border-radius: 2px;
        }
        .scrolled .hamburger span {
            background: #fff;
        }

        /* Hero */
        #hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            padding-top: var(--nav-height);
            background: linear-gradient(135deg, rgba(247,245,240,0.95) 0%, rgba(237,241,239,0.8) 100%);
            position: relative;
            overflow: hidden;
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }
        .hero-content h1 {
            font-size: 56px;
            font-weight: 900;
            line-height: 1.1;
            letter-spacing: -1px;
            color: var(--primary);
            margin-bottom: 20px;
        }
        .hero-content h1 span {
            color: var(--accent);
        }
        .hero-subtitle {
            font-size: 1.25rem;
            color: var(--text-muted);
            margin-bottom: 40px;
            max-width: 90%;
        }
        .hero-buttons {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .hero-visual {
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            border-radius: 24px;
            height: 520px;
            position: relative;
            box-shadow: 0 25px 50px rgba(0,0,0,0.15);
            overflow: hidden;
        }
        .hero-visual::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(10,61,46,0.45) 0%, rgba(0,0,0,0.2) 100%);
        }
        .hero-bg-texture {
            position: absolute;
            right: 0;
            top: 0;
            width: 45%;
            height: 100%;
            background: radial-gradient(circle at 20% 30%, rgba(212,168,67,0.05) 0%, transparent 70%);
            pointer-events: none;
        }

        /* Section Titles */
        .section-header {
            text-align: center;
            margin-bottom: 64px;
        }
        .section-header h2 {
            font-size: 40px;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--primary);
        }
        .section-header .divider {
            width: 60px;
            height: 4px;
            background: var(--accent);
            margin: 0 auto;
            border-radius: 2px;
        }

        /* Features */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
        }
        .feature-card {
            background: var(--card-bg);
            padding: 48px 32px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
            text-align: center;
            border: 1px solid transparent;
        }
        .feature-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: var(--accent);
        }
        .feature-icon {
            width: 80px;
            height: 80px;
            background: #EDF1EF;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 24px;
            font-size: 2.2rem;
            color: var(--accent);
            transition: 0.3s;
        }
        .feature-card:hover .feature-icon {
            background: rgba(212,168,67,0.25);
        }
        .feature-card h3 {
            font-size: 1.5rem;
            margin-bottom: 12px;
        }

        /* Scenarios */
        .scenario-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
            margin-bottom: 80px;
        }
        .scenario-row:last-child {
            margin-bottom: 0;
        }
        .scenario-img {
            background-size: cover;
            background-position: center;
            border-radius: 16px;
            height: 400px;
            box-shadow: 0 12px 30px rgba(0,0,0,0.08);
        }
        .scenario-number {
            font-family: var(--font-number);
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--accent);
            letter-spacing: 2px;
            margin-bottom: 16px;
        }
        .scenario-text h3 {
            font-size: 1.8rem;
            margin-bottom: 16px;
        }
        .reverse {
            direction: rtl;
        }
        .reverse .scenario-text {
            direction: ltr;
        }

        /* Cases */
        .cases-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
        }
        .case-card {
            background: var(--case-bg);
            padding: 40px 24px;
            border-radius: var(--border-radius);
            text-align: center;
            transition: 0.3s;
            border: 2px solid transparent;
        }
        .case-card:hover {
            border-color: var(--accent);
            transform: translateY(-4px);
            background: #fff;
        }
        .case-number {
            font-family: var(--font-number);
            font-size: 3.5rem;
            font-weight: 900;
            color: var(--accent);
            line-height: 1;
        }
        .case-logo-placeholder {
            width: 64px;
            height: 64px;
            background: #ddd;
            border-radius: 50%;
            margin: 20px auto;
            background-image: url('/assets/images/coverpic/cover-2.webp');
            background-size: cover;
        }

        /* Pricing */
        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
            align-items: start;
        }
        .pricing-card {
            background: var(--card-bg);
            padding: 48px 32px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-sm);
            text-align: center;
            transition: 0.3s;
            border: 2px solid transparent;
            position: relative;
        }
        .pricing-card.featured {
            background: var(--primary);
            color: #fff;
            transform: scale(1.05);
            border-color: var(--accent);
        }
        .pricing-badge {
            position: absolute;
            top: -14px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--accent);
            color: var(--primary);
            padding: 6px 24px;
            border-radius: 20px;
            font-weight: 700;
            font-size: 0.9rem;
        }
        .price {
            font-family: var(--font-number);
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary);
            margin: 20px 0;
        }
        .featured .price {
            color: #fff;
        }
        .feature-list {
            list-style: none;
            margin: 24px 0;
        }
        .feature-list li {
            margin-bottom: 12px;
            color: var(--text-muted);
        }
        .featured .feature-list li {
            color: rgba(255,255,255,0.8);
        }
        .feature-list i {
            color: var(--accent);
            margin-right: 8px;
        }

        /* FAQ */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            border-bottom: 1px solid #ddd;
            padding: 20px 0;
            cursor: pointer;
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            font-size: 1.2rem;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s;
            color: var(--text-muted);
            border-left: 3px solid var(--accent);
            padding-left: 0;
            margin-top: 0;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding-left: 16px;
            margin-top: 12px;
        }
        .faq-icon {
            font-size: 1.5rem;
            color: var(--accent);
        }

        /* Footer CTA */
        .footer-cta {
            background: var(--primary);
            padding: 100px 0;
            text-align: center;
            color: #fff;
        }
        .footer-cta h2 {
            color: #fff;
            margin-bottom: 16px;
        }
        .subscribe-form {
            display: flex;
            max-width: 480px;
            margin: 30px auto 0;
            gap: 12px;
        }
        .subscribe-form input {
            flex: 1;
            padding: 14px 20px;
            border-radius: var(--button-radius);
            border: none;
            font-size: 1rem;
        }
        .site-footer {
            background: #05261C;
            color: rgba(255,255,255,0.7);
            padding: 40px 0;
            text-align: center;
            font-size: 0.9rem;
        }
        .footer-logo {
            font-family: var(--font-number);
            font-weight: 800;
            font-size: 1.5rem;
            color: var(--accent);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .hero-grid, .scenario-row {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            .hero-visual {
                height: 350px;
            }
            .features-grid, .cases-grid, .pricing-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 768px) {
            .hamburger {
                display: flex;
            }
            .nav-menu {
                position: fixed;
                top: 0;
                right: -100%;
                width: 75%;
                height: 100vh;
                background: var(--primary);
                flex-direction: column;
                justify-content: center;
                gap: 40px;
                transition: 0.3s;
                z-index: 55;
            }
            .nav-menu.active {
                right: 0;
            }
            .nav-link {
                color: #fff;
                font-size: 1.3rem;
            }
            .features-grid, .cases-grid, .pricing-grid {
                grid-template-columns: 1fr;
            }
            .hero-content h1 {
                font-size: 40px;
            }
            .subscribe-form {
                flex-direction: column;
            }
        }