/* Base styles */
    body {
        font-family: 'Inter', 'Noto Sans JP', sans-serif;
        background-color: #f8fafc; /* bg-slate-50 */
        color: #334155; /* text-slate-800 */
        scroll-behavior: smooth; /* scroll-smooth */
        margin: 0;
        padding: 0;
    }

    /* Container */
    .container {
        width: 100%;
        max-width: 1280px; /* max-w-7xl (container default for larger screens) */
        margin-left: auto;
        margin-right: auto;
        padding-left: 1.5rem; /* px-6 */
        padding-right: 1.5rem; /* px-6 */
    }

    /* Header (Removed for main tag only output, but keeping definition for reference if needed) */
    .header {
        background-color: rgba(255, 255, 255, 0.8); /* bg-white/80 */
        backdrop-filter: blur(8px); /* backdrop-blur-md */
        position: sticky;
        top: 0;
        z-index: 50;
        box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05); /* shadow-sm */
    }

    .header-nav {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding-top: 1rem; /* py-4 */
        padding-bottom: 1rem; /* py-4 */
    }

    .header-logo {
        font-size: 1.5rem; /* text-2xl */
        font-weight: 700; /* font-bold */
        color: #0f172a; /* text-slate-900 */
    }

    .header-nav-links {
        display: none; /* hidden */
        gap: 1.5rem; /* space-x-6 */
        align-items: center;
    }

    .header-nav-links a {
        color: #475569; /* text-slate-600 */
        transition-property: color; /* transition-colors */
        transition-duration: 150ms;
        transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
    }

    .header-nav-links a:hover {
        color: #2563eb; /* hover:text-blue-600 */
    }

    .header-cta-button {
        background-color: #2563eb; /* bg-blue-600 */
        color: #fff; /* text-white */
        padding: 0.5rem 1rem; /* px-4 py-2 */
        border-radius: 0.5rem; /* rounded-lg */
        font-weight: 600; /* font-semibold */
        transition-property: all; /* transition-all */
        transition-duration: 150ms;
        transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06); /* shadow */
    }

    .header-cta-button:hover {
        background-color: #1d4ed8; /* hover:bg-blue-700 */
    }

    .mobile-menu-button {
        color: #334155; /* text-slate-800 */
        font-size: 1.5rem; /* text-2xl */
        display: block; /* md:hidden */
    }

    .mobile-menu {
        display: none; /* hidden md:hidden */
        background-color: #fff; /* bg-white */
    }

    .mobile-menu a {
        display: block;
        padding: 0.5rem 1.5rem; /* py-2 px-6 */
        color: #475569; /* text-slate-600 */
    }

    .mobile-menu a:hover {
        background-color: #f1f5f9; /* hover:bg-slate-100 */
    }

    .mobile-menu .cta-link {
        padding: 1rem 1.5rem; /* py-4 px-6 */
        text-align: center;
        background-color: #2563eb; /* bg-blue-600 */
        color: #fff; /* text-white */
    }

    .mobile-menu .cta-link:hover {
        background-color: #1d4ed8; /* hover:bg-blue-700 */
    }

    /* Sections */
    section {
        padding-top: 4rem; /* py-16 */
        padding-bottom: 4rem; /* py-16 */
    }

    .section-title {
        font-size: 1.875rem; /* text-3xl */
        font-weight: 700; /* font-bold */
        color: #0f172a; /* text-slate-900 */
        text-align: center;
        margin-bottom: 3rem; /* mb-12 */
    }

    .section-description {
        margin-top: 1rem; /* mt-4 */
        color: #475569; /* text-slate-600 */
        max-width: 48rem; /* max-w-2xl */
        margin-left: auto;
        margin-right: auto;
        text-align: center;
    }

    /* Hero Section */
    #hero {
        background-color: #fff; /* bg-white */
        padding-top: 5rem; /* py-20 */
        padding-bottom: 5rem; /* py-20 */
        text-align: center;
    }

    .hero-title {
        font-size: 2.25rem; /* text-4xl */
        font-weight: 700; /* font-bold */
        color: #0f172a; /* text-slate-900 */
        line-height: 1.25; /* leading-tight */
    }

    .hero-title .highlight {
        color: #2563eb; /* text-blue-600 */
    }

    .hero-description {
        margin-top: 1.5rem; /* mt-6 */
        font-size: 1.125rem; /* text-lg */
        color: #475569; /* text-slate-600 */
        max-width: 42rem; /* max-w-2xl */
        margin-left: auto;
        margin-right: auto;
    }

    .hero-cta-wrapper {
        margin-top: 2.5rem; /* mt-10 */
    }

    .hero-cta-button {
        background-color: #2563eb; /* bg-blue-600 */
        color: #fff; /* text-white */
        padding: 1rem 2rem; /* px-8 py-4 */
        border-radius: 0.5rem; /* rounded-lg */
        font-size: 1.125rem; /* text-lg */
        font-weight: 600; /* font-semibold */
        transition-property: all; /* transition-all */
        transition-duration: 150ms;
        transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05); /* shadow-lg */
        display: inline-block;
    }

    .hero-cta-button:hover {
        background-color: #1d4ed8; /* hover:bg-blue-700 */
        box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04); /* hover:shadow-xl */
        transform: translateY(-0.25rem); /* hover:-translate-y-1 */
    }

    /* Features Section */
    .feature-card {
        background-color: #fff; /* bg-white */
        padding: 2rem; /* p-8 */
        border-radius: 0.75rem; /* rounded-xl */
        box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06); /* shadow-md */
        text-align: center;
        transition-property: box-shadow; /* transition-shadow */
        transition-duration: 150ms;
        transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
    }

    .feature-card:hover {
        box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05); /* hover:shadow-lg */
    }

    .feature-icon {
        font-size: 2.25rem; /* text-4xl */
        color: #2563eb; /* text-blue-600 */
        margin-bottom: 1rem; /* mb-4 */
    }

    .feature-title {
        font-size: 1.25rem; /* text-xl */
        font-weight: 700; /* font-bold */
        margin-bottom: 0.5rem; /* mb-2 */
        color: #0f172a; /* text-slate-900 */
    }

    .feature-description {
        color: #475569; /* text-slate-600 */
    }

    /* Services Section */
    #services {
        background-color: #fff; /* bg-white */
    }

    .service-item {
        padding: 1rem; /* p-4 */
        background-color: #f8fafc; /* bg-slate-50 */
        border-radius: 0.5rem; /* rounded-lg */
        text-align: center;
    }

    .service-icon {
        font-size: 2.25rem; /* text-4xl */
        margin-bottom: 0.5rem; /* mb-2 */
    }

    .service-name {
        display: block;
        font-weight: 600; /* font-semibold */
    }

    /* Pricing Section */
    .pricing-card {
        background-color: #fff; /* bg-white */
        padding: 2rem; /* p-8 */
        border-radius: 0.75rem; /* rounded-xl */
        box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05); /* shadow-lg */
        border: 1px solid #e2e8f0; /* border border-slate-200 */
        display: flex;
        flex-direction: column;
    }

    .pricing-card.popular {
        background-color: #2563eb; /* bg-blue-600 */
        color: #fff; /* text-white */
        box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04); /* shadow-2xl */
        border: 2px solid #1d4ed8; /* border-2 border-blue-700 */
        transform: scale(1.05); /* transform scale-105 */
        position: relative;
    }

    .pricing-card.popular .badge {
        position: absolute;
        top: 0;
        right: 1rem; /* right-4 */
        margin-top: -1rem; /* -mt-4 */
        background-color: #facc15; /* bg-yellow-400 */
        color: #78350f; /* text-yellow-900 */
        font-size: 0.75rem; /* text-xs */
        font-weight: 700; /* font-bold */
        padding: 0.25rem 0.75rem; /* px-3 py-1 */
        border-radius: 9999px; /* rounded-full */
    }

    .pricing-title {
        font-size: 1.5rem; /* text-2xl */
        font-weight: 700; /* font-bold */
        text-align: center;
        color: #0f172a; /* text-slate-900 */
    }

    .pricing-card.popular .pricing-title {
        color: #fff;
    }

    .pricing-subtitle {
        text-align: center;
        color: #64748b; /* text-slate-500 */
        margin-top: 0.5rem; /* mt-2 */
    }

    .pricing-card.popular .pricing-subtitle {
        color: #bfdbfe; /* text-blue-200 */
    }

    .price-display {
        text-align: center;
        margin-top: 1.5rem; /* my-6 */
        margin-bottom: 1.5rem; /* my-6 */
    }

    .price-value {
        font-size: 3.125rem; /* text-5xl */
        font-weight: 700; /* font-bold */
        color: #0f172a; /* text-slate-900 */
    }

    .pricing-card.popular .price-value {
        color: #fff;
    }

    .price-unit {
        font-size: 1.5rem; /* text-2xl */
        font-weight: 600; /* font-semibold */
        color: #334155; /* text-slate-700 */
    }

    .pricing-card.popular .price-unit {
        color: #fff;
    }

    .price-suffix {
        color: #64748b; /* text-slate-500 */
    }

    .pricing-card.popular .price-suffix {
        color: #bfdbfe; /* text-blue-200 */
    }

    .pricing-features {
        list-style: none;
        padding: 0;
        margin: 0;
        margin-top: 1rem; /* space-y-4 */
        display: flex;
        flex-direction: column;
        gap: 1rem;
        flex-grow: 1;
    }

    .pricing-features li {
        display: flex;
        align-items: center;
        color: #475569; /* text-slate-600 */
    }

    .pricing-card.popular .pricing-features li {
        color: #e0f2fe; /* text-blue-100 */
    }

    .pricing-features li i {
        color: #22c55e; /* text-green-500 */
        margin-right: 0.75rem; /* mr-3 */
    }

    .pricing-card.popular .pricing-features li i {
        color: #fff;
    }

    .pricing-cta-button {
        margin-top: 2rem; /* mt-8 */
        display: block;
        width: 100%;
        text-align: center;
        background-color: #e2e8f0; /* bg-slate-200 */
        color: #334155; /* text-slate-800 */
        padding: 0.75rem 0; /* py-3 */
        border-radius: 0.5rem; /* rounded-lg */
        font-weight: 600; /* font-semibold */
        transition-property: background-color; /* transition-colors */
        transition-duration: 150ms;
        transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
    }

    .pricing-cta-button:hover {
        background-color: #cbd5e1; /* hover:bg-slate-300 */
    }

    .pricing-card.popular .pricing-cta-button {
        background-color: #fff; /* bg-white */
        color: #2563eb; /* text-blue-600 */
    }

    .pricing-card.popular .pricing-cta-button:hover {
        background-color: #f1f5f9; /* hover:bg-slate-100 */
    }

    /* Portfolio Section */
    #client-portfolio, #our-portfolio { /* Apply common styles to both portfolio sections */
        background-color: #fff; /* bg-white */
    }

    .portfolio-category-title {
        font-size: 1.25rem; /* text-xl */
        font-weight: 600; /* font-semibold */
        margin-bottom: 1rem; /* mb-4 */
        display: flex;
        align-items: center;
    }

    .portfolio-category-title i {
        margin-right: 0.75rem; /* mr-3 */
    }

    /* New card UI styles */
    .portfolio-grid {
        display: grid;
        gap: 1.5rem; /* gap-6 */
        max-width: 64rem; /* max-w-4xl */
        margin-left: auto;
        margin-right: auto;
        grid-template-columns: repeat(1, minmax(0, 1fr)); /* Default 1 column on mobile */
    }

    .portfolio-card {
        display: flex;
        flex-direction: column;
        background-color: #fff;
        padding: 1.5rem; /* p-6 */
        border-radius: 0.75rem; /* rounded-xl */
        box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06); /* shadow-md */
        text-align: center;
        transition-property: box-shadow, transform;
        transition-duration: 150ms;
        transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
        text-decoration: none; /* Remove underline from link */
        color: inherit; /* Inherit text color */
    }

    .portfolio-card:hover {
        box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05); /* hover:shadow-lg */
        transform: translateY(-0.25rem); /* hover:-translate-y-1 */
    }

    .portfolio-card-image {
        width: 100%;
        height: 150px; /* Fixed height for consistency */
        object-fit: cover; /* Cover the area, cropping if necessary */
        border-radius: 0.5rem; /* rounded-lg */
        margin-bottom: 1rem; /* mb-4 */
    }

    .portfolio-card-title {
        font-size: 1.125rem; /* text-lg */
        font-weight: 600; /* font-semibold */
        color: #0f172a; /* text-slate-900 */
        margin-bottom: 0.5rem; /* mb-2 */
    }

    .portfolio-card-description {
        font-size: 0.875rem; /* text-sm */
        color: #475569; /* text-slate-600 */
        flex-grow: 1; /* Allow description to take available space */
    }

    /* Target Section */
    .target-card {
        background-color: #fff; /* bg-white */
        padding: 2rem; /* p-8 */
        border-radius: 0.75rem; /* rounded-xl */
        box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06); /* shadow-md */
    }

    .target-icon {
        font-size: 1.875rem; /* text-3xl */
        color: #2563eb; /* text-blue-600 */
        margin-bottom: 1rem; /* mb-4 */
    }

    .target-title {
        font-size: 1.25rem; /* text-xl */
        font-weight: 700; /* font-bold */
        margin-bottom: 0.5rem; /* mb-2 */
        color: #0f172a; /* text-slate-900 */
    }

    .target-description {
        color: #475569; /* text-slate-600 */
    }

    /* Contact Section */
    #contact {
        background-color: #1d4ed8; /* bg-blue-700 */
        color: #fff; /* text-white */
        padding-top: 5rem; /* py-20 */
        padding-bottom: 5rem; /* py-20 */
        text-align: center;
    }

    .contact-title {
        font-size: 1.875rem; /* text-3xl */
        font-weight: 700; /* font-bold */
    }

    .contact-description {
        margin-top: 1rem; /* mt-4 */
        font-size: 1.125rem; /* text-lg */
        color: #bfdbfe; /* text-blue-200 */
        max-width: 48rem; /* max-w-2xl */
        margin-left: auto;
        margin-right: auto;
    }

    .contact-cta-wrapper {
        margin-top: 2.5rem; /* mt-10 */
    }

    .contact-cta-button {
        background-color: #fff; /* bg-white */
        color: #1d4ed8; /* text-blue-700 */
        padding: 1rem 2rem; /* px-8 py-4 */
        border-radius: 0.5rem; /* rounded-lg */
        font-size: 1.125rem; /* text-lg */
        font-weight: 600; /* font-semibold */
        transition-property: all; /* transition-all */
        transition-duration: 150ms;
        transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05); /* shadow-lg */
        display: inline-block;
    }

    .contact-cta-button:hover {
        background-color: #f1f5f9; /* hover:bg-slate-100 */
        box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04); /* hover:shadow-xl */
        transform: translateY(-0.25rem); /* hover:-translate-y-1 */
    }

    .contact-email-note {
        margin-top: 1.5rem; /* mt-6 */
        font-size: 0.875rem; /* text-sm */
        color: #93c5fd; /* text-blue-300 */
    }

    /* Footer (Removed for main tag only output, but keeping definition for reference if needed) */
    .footer {
        background-color: #1e293b; /* bg-slate-800 */
        color: #94a3b8; /* text-slate-400 */
        padding-top: 2rem; /* py-8 */
        padding-bottom: 2rem; /* py-8 */
        text-align: center;
        font-size: 0.875rem; /* text-sm */
    }

    /* Generic grid and gap definitions */
    .grid {
        display: grid;
    }

    .gap-8 {
        gap: 2rem; /* 32px */
    }

    .gap-4 {
        gap: 1rem; /* 16px */
    }

    /* Responsive adjustments */
    @media (min-width: 640px) { /* sm breakpoint */
        /* Portfolio grid for sm:grid-cols-2 */
        .portfolio-grid {
            grid-template-columns: repeat(2, minmax(0, 1fr));
        }
    }

    @media (min-width: 768px) { /* md breakpoint */
        .header-nav-links {
            display: flex;
        }
        .mobile-menu-button, .mobile-menu {
            display: none !important;
        }
        #hero {
            padding-top: 8rem; /* sm:py-32 */
            padding-bottom: 8rem; /* sm:py-32 */
        }
        .hero-title {
            font-size: 3.75rem; /* md:text-6xl */
        }
        section {
            padding-top: 6rem; /* sm:py-24 */
            padding-bottom: 6rem; /* sm:py-24 */
        }
        .section-title {
            font-size: 2.25rem; /* md:text-4xl */
        }
        #features .grid {
            grid-template-columns: repeat(3, minmax(0, 1fr)); /* md:grid-cols-3 */
        }
        #services .grid {
            grid-template-columns: repeat(3, minmax(0, 1fr)); /* md:grid-cols-3 */
        }
        #services .service-item.col-span-2 {
            grid-column: span 3 / span 3; /* md:col-span-3 */
        }
        #target .grid {
            grid-template-columns: repeat(2, minmax(0, 1fr)); /* md:grid-cols-2 */
        }
        #contact {
            padding-top: 7rem; /* sm:py-28 */
            padding-bottom: 7rem; /* sm:py-28 */
        }
        .contact-title {
            font-size: 2.25rem; /* md:text-4xl */
        }
    }

    @media (min-width: 1024px) { /* lg breakpoint */
        #services .grid {
            grid-template-columns: repeat(5, minmax(0, 1fr)); /* lg:grid-cols-5 */
        }
        #services .service-item.col-span-2 {
            grid-column: span 5 / span 5; /* lg:col-span-5 */
        }
        #pricing .grid {
            grid-template-columns: repeat(3, minmax(0, 1fr)); /* lg:grid-cols-3 */
        }
        .portfolio-grid {
            grid-template-columns: repeat(3, minmax(0, 1fr)); /* lg:grid-cols-3 */
        }
    }