/* roulang page: index */
:root {
            --color-brand: #1e3a5f;
            --color-brand-light: #2a5278;
            --color-accent: #f0c040;
            --color-accent-deep: #ca8a04;
            --color-bg: #f7f8fa;
            --color-surface: #ffffff;
            --color-text: #1a202c;
            --color-text-soft: #5a6677;
            --color-text-muted: #8895a7;
            --color-border: #e5e8ed;
            --color-border-light: #f0f2f5;
            --radius-sm: 0.5rem;
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.25rem;
            --radius-2xl: 1.5rem;
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 1px 3px rgba(0, 0, 0, 0.06), 0 4px 16px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 2px 8px rgba(0, 0, 0, 0.08), 0 8px 32px rgba(0, 0, 0, 0.06);
            --shadow-xl: 0 4px 16px rgba(0, 0, 0, 0.10), 0 16px 48px rgba(0, 0, 0, 0.06);
            --transition-fast: 0.15s ease;
            --transition-normal: 0.25s ease;
            --transition-slow: 0.35s ease;
            --safe-bottom: env(safe-area-inset-bottom, 0px);
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
            text-size-adjust: 100%;
        }

        body {
            font-family: "Inter", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            line-height: 1.6;
            color: var(--color-text);
            background-color: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            min-height: 100vh;
            padding-bottom: 0;
        }

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

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

        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            background: none;
        }

        input {
            font-family: inherit;
            outline: none;
        }

        /* Header / Nav */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--color-border-light);
            box-shadow: var(--shadow-sm);
            transition: box-shadow var(--transition-normal);
        }
        .site-header.scrolled {
            box-shadow: var(--shadow-md);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 1.5rem;
            height: 60px;
            max-width: 1280px;
            margin: 0 auto;
        }
        .logo-link {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-weight: 700;
            font-size: 1.15rem;
            color: var(--color-brand);
            white-space: nowrap;
            letter-spacing: -0.01em;
            transition: opacity var(--transition-fast);
        }
        .logo-link:hover {
            opacity: 0.85;
        }
        .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: var(--radius-md);
            background: linear-gradient(135deg, #1e3a5f 0%, #3b6b94 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.1rem;
            flex-shrink: 0;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 0.25rem;
            list-style: none;
        }
        .nav-links a {
            display: inline-flex;
            align-items: center;
            padding: 0.5rem 0.9rem;
            border-radius: var(--radius-md);
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--color-text-soft);
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .nav-links a:hover {
            color: var(--color-brand);
            background: rgba(30, 58, 95, 0.05);
        }
        .nav-links a.active {
            color: var(--color-brand);
            background: rgba(30, 58, 95, 0.08);
            font-weight: 600;
        }
        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.5rem 1.1rem;
            border-radius: var(--radius-lg);
            font-size: 0.88rem;
            font-weight: 600;
            background: var(--color-brand);
            color: #fff !important;
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .nav-cta:hover {
            background: var(--color-brand-light);
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }
        .search-trigger {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            color: var(--color-text-soft);
            transition: all var(--transition-fast);
            font-size: 1rem;
        }
        .search-trigger:hover {
            color: var(--color-brand);
            background: rgba(30, 58, 95, 0.06);
        }

        /* Mobile Bottom Tab Nav */
        .bottom-tab-nav {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 200;
            background: rgba(255, 255, 255, 0.94);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-top: 1px solid var(--color-border-light);
            box-shadow: var(--shadow-tab);
            padding: 6px 8px calc(6px + var(--safe-bottom));
            display: none;
        }
        .bottom-tab-inner {
            display: flex;
            align-items: center;
            justify-content: space-around;
            max-width: 500px;
            margin: 0 auto;
        }
        .bottom-tab-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 2px;
            padding: 6px 10px;
            border-radius: var(--radius-md);
            font-size: 0.7rem;
            font-weight: 500;
            color: var(--color-text-muted);
            transition: all var(--transition-fast);
            min-width: 56px;
            text-align: center;
            cursor: pointer;
        }
        .bottom-tab-item i {
            font-size: 1.25rem;
            transition: all var(--transition-fast);
        }
        .bottom-tab-item.active {
            color: var(--color-brand);
            font-weight: 600;
        }
        .bottom-tab-item.active i {
            color: var(--color-brand);
        }
        .bottom-tab-item:active {
            transform: scale(0.94);
            background: rgba(30, 58, 95, 0.06);
        }

        /* Hero */
        .hero-section {
            position: relative;
            background: linear-gradient(170deg, #f0f4f8 0%, #e8edf3 30%, #f7f8fa 70%, #ffffff 100%);
            overflow: hidden;
        }
        .hero-bg-pattern {
            position: absolute;
            inset: 0;
            pointer-events: none;
            opacity: 0.04;
            background-image: radial-gradient(circle at 20% 50%, #1e3a5f 1px, transparent 1px),
                radial-gradient(circle at 70% 30%, #1e3a5f 1px, transparent 1px),
                radial-gradient(circle at 40% 80%, #1e3a5f 1.5px, transparent 1.5px);
            background-size: 60px 60px, 80px 80px, 100px 100px;
        }
        .hero-inner {
            position: relative;
            z-index: 1;
            max-width: 900px;
            margin: 0 auto;
            padding: 4rem 1.5rem 4.5rem;
            text-align: center;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.35rem 0.9rem;
            border-radius: 999px;
            background: rgba(30, 58, 95, 0.07);
            color: var(--color-brand);
            font-size: 0.82rem;
            font-weight: 600;
            margin-bottom: 1.25rem;
            letter-spacing: 0.02em;
        }
        .hero-badge .live-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: #e53e3e;
            animation: pulse-dot 2s ease-in-out infinite;
        }
        @keyframes pulse-dot {
            0%,
            100% {
                opacity: 1;
                box-shadow: 0 0 0 0 rgba(229, 62, 62, 0.5);
            }
            50% {
                opacity: 0.7;
                box-shadow: 0 0 0 8px rgba(229, 62, 62, 0);
            }
        }
        .hero-title {
            font-size: clamp(2rem, 5vw, 3.2rem);
            font-weight: 800;
            line-height: 1.2;
            color: #0f1f33;
            margin-bottom: 1rem;
            letter-spacing: -0.02em;
        }
        .hero-title .highlight {
            color: var(--color-brand);
            position: relative;
        }
        .hero-subtitle {
            font-size: 1.1rem;
            color: var(--color-text-soft);
            max-width: 600px;
            margin: 0 auto 2rem;
            line-height: 1.7;
        }
        .hero-search-wrap {
            display: flex;
            align-items: center;
            max-width: 520px;
            margin: 0 auto 1.5rem;
            background: #fff;
            border-radius: 999px;
            box-shadow: var(--shadow-lg);
            border: 2px solid transparent;
            transition: all var(--transition-normal);
            overflow: hidden;
        }
        .hero-search-wrap:focus-within {
            border-color: var(--color-brand);
            box-shadow: var(--shadow-xl);
        }
        .hero-search-wrap input {
            flex: 1;
            padding: 0.85rem 1.25rem;
            border: none;
            font-size: 0.95rem;
            color: var(--color-text);
            background: transparent;
            min-width: 0;
        }
        .hero-search-wrap input::placeholder {
            color: var(--color-text-muted);
        }
        .hero-search-btn {
            display: flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.75rem 1.4rem;
            margin: 4px;
            border-radius: 999px;
            background: var(--color-brand);
            color: #fff;
            font-weight: 600;
            font-size: 0.9rem;
            white-space: nowrap;
            transition: all var(--transition-fast);
        }
        .hero-search-btn:hover {
            background: var(--color-brand-light);
            box-shadow: 0 4px 16px rgba(30, 58, 95, 0.3);
        }
        .hero-tags {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 0.5rem;
            font-size: 0.8rem;
            color: var(--color-text-muted);
        }
        .hero-tags span {
            padding: 0.25rem 0.7rem;
            border-radius: 999px;
            background: rgba(30, 58, 95, 0.04);
            color: var(--color-text-soft);
            cursor: default;
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .hero-tags span:hover {
            background: rgba(30, 58, 95, 0.1);
            color: var(--color-brand);
        }

        /* Section共通 */
        .section {
            padding: 3.5rem 1.5rem;
        }
        .section-header {
            text-align: center;
            margin-bottom: 2.5rem;
        }
        .section-label {
            display: inline-block;
            font-size: 0.78rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            color: var(--color-accent-deep);
            margin-bottom: 0.5rem;
        }
        .section-title {
            font-size: clamp(1.5rem, 3.5vw, 2rem);
            font-weight: 700;
            color: #0f1f33;
            letter-spacing: -0.01em;
            margin-bottom: 0.5rem;
        }
        .section-desc {
            color: var(--color-text-soft);
            max-width: 550px;
            margin: 0 auto;
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
        }

        /* Cards */
        .card {
            background: #fff;
            border-radius: var(--radius-xl);
            border: 1px solid var(--color-border-light);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition-normal);
            overflow: hidden;
        }
        .card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
            border-color: var(--color-border);
        }
        .card-thumb {
            position: relative;
            aspect-ratio: 16/9;
            background: linear-gradient(135deg, #1a3a55 0%, #2a5a7a 40%, #1e4a3a 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }
        .card-thumb .play-btn {
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.9);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-brand);
            font-size: 1.1rem;
            transition: all var(--transition-fast);
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
        }
        .card:hover .card-thumb .play-btn {
            background: #fff;
            transform: scale(1.08);
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.3);
        }
        .card-thumb-badge {
            position: absolute;
            top: 10px;
            left: 10px;
            padding: 0.25rem 0.6rem;
            border-radius: 999px;
            background: rgba(0, 0, 0, 0.6);
            color: #fff;
            font-size: 0.72rem;
            font-weight: 600;
            backdrop-filter: blur(4px);
        }
        .card-thumb-duration {
            position: absolute;
            bottom: 10px;
            right: 10px;
            padding: 0.2rem 0.5rem;
            border-radius: 4px;
            background: rgba(0, 0, 0, 0.7);
            color: #fff;
            font-size: 0.7rem;
            font-weight: 500;
        }
        .card-body {
            padding: 1rem 1.15rem 1.15rem;
        }
        .card-title {
            font-weight: 600;
            font-size: 0.95rem;
            color: #0f1f33;
            line-height: 1.4;
            margin-bottom: 0.35rem;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .card-meta {
            font-size: 0.78rem;
            color: var(--color-text-muted);
            display: flex;
            align-items: center;
            gap: 0.6rem;
            flex-wrap: wrap;
        }

        /* Feature icon cards */
        .feature-card {
            background: #fff;
            border-radius: var(--radius-xl);
            border: 1px solid var(--color-border-light);
            padding: 1.5rem;
            text-align: center;
            transition: all var(--transition-normal);
            box-shadow: var(--shadow-sm);
        }
        .feature-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
            border-color: var(--color-border);
        }
        .feature-icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-lg);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1rem;
            font-size: 1.4rem;
            transition: all var(--transition-normal);
        }
        .feature-card:hover .feature-icon {
            transform: scale(1.06);
        }
        .feature-icon.blue {
            background: #e8f0fb;
            color: #2a5278;
        }
        .feature-icon.green {
            background: #e6f4ec;
            color: #2d7a3f;
        }
        .feature-icon.amber {
            background: #fef8e6;
            color: #a16207;
        }
        .feature-icon.purple {
            background: #f3edfa;
            color: #5b3e8c;
        }
        .feature-title {
            font-weight: 700;
            font-size: 1rem;
            color: #0f1f33;
            margin-bottom: 0.4rem;
        }
        .feature-desc {
            font-size: 0.85rem;
            color: var(--color-text-soft);
            line-height: 1.6;
        }

        /* Stats */
        .stat-block {
            text-align: center;
            padding: 1rem;
        }
        .stat-number {
            font-size: clamp(1.8rem, 4vw, 2.6rem);
            font-weight: 800;
            color: var(--color-brand);
            letter-spacing: -0.02em;
        }
        .stat-label {
            font-size: 0.85rem;
            color: var(--color-text-soft);
            margin-top: 0.2rem;
        }

        /* Steps */
        .step-card {
            display: flex;
            align-items: flex-start;
            gap: 1rem;
            padding: 1.25rem;
            background: #fff;
            border-radius: var(--radius-xl);
            border: 1px solid var(--color-border-light);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition-normal);
        }
        .step-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-1px);
        }
        .step-number {
            width: 42px;
            height: 42px;
            border-radius: 50%;
            background: var(--color-brand);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.05rem;
            flex-shrink: 0;
        }
        .step-content h4 {
            font-weight: 600;
            font-size: 0.95rem;
            color: #0f1f33;
            margin-bottom: 0.2rem;
        }
        .step-content p {
            font-size: 0.83rem;
            color: var(--color-text-soft);
            line-height: 1.6;
        }

        /* FAQ */
        .faq-item {
            border-bottom: 1px solid var(--color-border-light);
            padding: 1.1rem 0;
            cursor: pointer;
            transition: all var(--transition-fast);
        }
        .faq-item:hover .faq-question {
            color: var(--color-brand);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-weight: 600;
            font-size: 0.95rem;
            color: #0f1f33;
            gap: 1rem;
            transition: color var(--transition-fast);
        }
        .faq-question i {
            font-size: 0.8rem;
            color: var(--color-text-muted);
            transition: all var(--transition-normal);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--color-brand);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-slow);
            font-size: 0.88rem;
            color: var(--color-text-soft);
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding-top: 0.7rem;
        }

        /* CTA Banner */
        .cta-banner {
            background: linear-gradient(140deg, #1e3a5f 0%, #2a5278 40%, #1e4a3a 100%);
            border-radius: var(--radius-2xl);
            padding: 2.5rem 2rem;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .cta-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            pointer-events: none;
            opacity: 0.06;
            background: radial-gradient(circle at 30% 50%, #fff 1px, transparent 1px),
                radial-gradient(circle at 70% 40%, #fff 1.5px, transparent 1.5px);
            background-size: 50px 50px, 70px 70px;
        }
        .cta-banner h3 {
            position: relative;
            z-index: 1;
            font-size: clamp(1.4rem, 3vw, 1.8rem);
            font-weight: 700;
            margin-bottom: 0.6rem;
        }
        .cta-banner p {
            position: relative;
            z-index: 1;
            opacity: 0.85;
            margin-bottom: 1.5rem;
            font-size: 0.95rem;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }
        .cta-btn {
            position: relative;
            z-index: 1;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.8rem 2rem;
            border-radius: 999px;
            background: var(--color-accent);
            color: #1a202c;
            font-weight: 700;
            font-size: 0.95rem;
            transition: all var(--transition-fast);
            box-shadow: 0 4px 20px rgba(240, 192, 64, 0.35);
        }
        .cta-btn:hover {
            background: #f5d060;
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(240, 192, 64, 0.45);
        }

        /* Footer */
        .site-footer {
            background: #fff;
            border-top: 1px solid var(--color-border-light);
            padding: 2.5rem 1.5rem;
            text-align: center;
        }
        .footer-brand {
            font-weight: 700;
            font-size: 1.05rem;
            color: var(--color-brand);
            margin-bottom: 0.5rem;
        }
        .footer-links {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 1rem;
            margin-bottom: 1rem;
            font-size: 0.85rem;
            color: var(--color-text-soft);
        }
        .footer-links a {
            transition: color var(--transition-fast);
        }
        .footer-links a:hover {
            color: var(--color-brand);
        }
        .footer-copy {
            font-size: 0.78rem;
            color: var(--color-text-muted);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .header-inner {
                padding: 0 1rem;
                height: 54px;
            }
            .nav-links a {
                padding: 0.4rem 0.65rem;
                font-size: 0.82rem;
            }
            .logo-link {
                font-size: 1rem;
            }
            .logo-icon {
                width: 30px;
                height: 30px;
                font-size: 0.9rem;
            }
            .section {
                padding: 2.5rem 1rem;
            }
        }

        @media (max-width: 768px) {
            .header-inner {
                height: 50px;
                padding: 0 0.9rem;
            }
            .nav-links {
                display: none;
            }
            .nav-cta-desktop {
                display: none;
            }
            .logo-link {
                font-size: 0.9rem;
            }
            .logo-icon {
                width: 28px;
                height: 28px;
                font-size: 0.8rem;
                border-radius: var(--radius-sm);
            }
            .search-trigger {
                width: 34px;
                height: 34px;
                font-size: 0.9rem;
            }
            .bottom-tab-nav {
                display: block;
            }
            body {
                padding-bottom: 75px;
            }
            .hero-inner {
                padding: 2.5rem 1rem 3rem;
            }
            .hero-title {
                font-size: 1.7rem;
            }
            .hero-subtitle {
                font-size: 0.9rem;
            }
            .hero-search-wrap {
                max-width: 100%;
                border-radius: var(--radius-xl);
            }
            .hero-search-wrap input {
                padding: 0.7rem 1rem;
                font-size: 0.88rem;
            }
            .hero-search-btn {
                padding: 0.6rem 1rem;
                font-size: 0.8rem;
            }
            .section {
                padding: 2rem 0.8rem;
            }
            .section-title {
                font-size: 1.35rem;
            }
            .card-thumb .play-btn {
                width: 40px;
                height: 40px;
                font-size: 0.9rem;
            }
            .cta-banner {
                padding: 1.8rem 1.2rem;
                border-radius: var(--radius-xl);
            }
            .footer-links {
                gap: 0.6rem;
                font-size: 0.78rem;
            }
        }

        @media (max-width: 520px) {
            .hero-title {
                font-size: 1.45rem;
            }
            .hero-subtitle {
                font-size: 0.82rem;
            }
            .hero-search-wrap {
                flex-direction: column;
                border-radius: var(--radius-xl);
                box-shadow: var(--shadow-md);
                border-width: 1px;
            }
            .hero-search-wrap input {
                width: 100%;
                padding: 0.7rem 1rem;
                text-align: center;
            }
            .hero-search-btn {
                width: calc(100% - 8px);
                justify-content: center;
                margin: 0 4px 4px;
                border-radius: var(--radius-lg);
            }
            .hero-tags {
                gap: 0.35rem;
                font-size: 0.72rem;
            }
            .hero-tags span {
                padding: 0.2rem 0.5rem;
            }
            .section-title {
                font-size: 1.2rem;
            }
            .bottom-tab-item {
                font-size: 0.65rem;
                padding: 4px 6px;
                min-width: 44px;
            }
            .bottom-tab-item i {
                font-size: 1.1rem;
            }
            .card-body {
                padding: 0.75rem 0.85rem;
            }
            .card-title {
                font-size: 0.85rem;
            }
            .feature-card {
                padding: 1rem 0.8rem;
            }
            .feature-icon {
                width: 44px;
                height: 44px;
                font-size: 1.1rem;
                border-radius: var(--radius-md);
            }
        }