:root {
            --bg: #f4f6f8;
            --card: #ffffff;
            --text: #1f2937;
            --muted: #6b7280;
            --border: #e5e7eb;
            --dark: #111827;
            --blue: #2563eb;
            --blue-dark: #1d4ed8;
            --green: #16a34a;
            --orange: #ea580c;
            --yellow-soft: #fff7ed;
            --shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
            --radius: 18px;
        }

        * {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            font-family: Arial, Helvetica, sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.6;
        }

        a {
            color: inherit;
        }

        .site-header {
            background: #fff;
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 50;
        }

        .container {
            width: min(1180px, calc(100% - 32px));
            margin: 0 auto;
        }

        .header-inner {
            min-height: 76px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 18px;
        }

        .brand {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
            font-size: 24px;
            font-weight: 900;
            letter-spacing: -0.04em;
        }

        .brand-mark {
            width: 38px;
            height: 38px;
            border-radius: 12px;
            background: var(--dark);
            color: #fff;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: 900;
        }

        .brand span:last-child {
            color: var(--blue);
        }

        .nav {
            display: flex;
            align-items: center;
            gap: 18px;
            font-size: 14px;
            font-weight: 800;
        }

        .nav a {
            text-decoration: none;
            color: var(--muted);
            white-space: nowrap;
        }

        .nav a:hover {
            color: var(--text);
        }

        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }

        .language-switcher {
            display: inline-flex;
            align-items: center;
            margin: 0;
        }

        .language-switcher select {
            min-height: 40px;
            padding: 8px 34px 8px 12px;
            border: 1px solid var(--border);
            border-radius: 12px;
            background: #f9fafb;
            color: var(--text);
            font-size: 13px;
            font-weight: 900;
            cursor: pointer;
        }

        .language-switcher select:focus {
            outline: 2px solid rgba(37, 99, 235, 0.25);
            border-color: var(--blue);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            min-height: 44px;
            padding: 11px 16px;
            border-radius: 12px;
            border: 1px solid var(--border);
            background: #fff;
            color: var(--text);
            text-decoration: none;
            font-size: 14px;
            font-weight: 900;
            cursor: pointer;
            transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
        }

        .btn:hover {
            transform: translateY(-1px);
            box-shadow: 0 10px 22px rgba(15, 23, 42, 0.08);
        }

        .btn-primary {
            background: var(--blue);
            border-color: var(--blue);
            color: #fff;
        }

        .btn-primary:hover {
            background: var(--blue-dark);
        }

        .btn-dark {
            background: var(--dark);
            border-color: var(--dark);
            color: #fff;
        }

        .hero {
            padding: 76px 0 42px;
            background:
                radial-gradient(circle at 20% 10%, rgba(37, 99, 235, 0.16), transparent 32%),
                radial-gradient(circle at 90% 20%, rgba(234, 88, 12, 0.12), transparent 30%),
                linear-gradient(180deg, #ffffff 0%, #f4f6f8 100%);
        }

        .hero-grid {
            display: grid;
            grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.92fr);
            gap: 36px;
            align-items: center;
        }

        .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 7px 11px;
            border-radius: 999px;
            background: #eff6ff;
            color: var(--blue);
            font-size: 13px;
            font-weight: 900;
            margin-bottom: 18px;
        }

        .hero h1 {
            margin: 0;
            font-size: clamp(38px, 6vw, 64px);
            line-height: 0.95;
            letter-spacing: -0.07em;
            color: var(--dark);
        }

        .hero h1 strong {
            color: var(--blue);
        }

        .hero-text {
            margin: 22px 0 0;
            font-size: 18px;
            color: #4b5563;
            max-width: 680px;
        }

        .hero-actions {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            margin-top: 28px;
        }

        .hero-points {
            display: grid;
            grid-template-columns: repeat(3, minmax(0, 1fr));
            gap: 12px;
            margin-top: 28px;
        }

        .hero-point {
            background: rgba(255,255,255,0.8);
            border: 1px solid var(--border);
            border-radius: 14px;
            padding: 13px;
            font-size: 13px;
            font-weight: 800;
            color: #374151;
        }

        .hero-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 28px;
            box-shadow: var(--shadow);
            padding: 22px;
            position: relative;
            overflow: hidden;
        }

        .checkout-demo {
            position: relative;
            z-index: 1;
            display: grid;
            gap: 14px;
        }

        .demo-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
        }

        .demo-title {
            font-weight: 900;
            color: var(--dark);
            letter-spacing: -0.03em;
        }

        .badge {
            display: inline-flex;
            align-items: center;
            border-radius: 999px;
            padding: 5px 9px;
            background: #dcfce7;
            color: #166534;
            font-size: 12px;
            font-weight: 900;
            white-space: nowrap;
        }

        .qr-box {
            display: grid;
            grid-template-columns: 128px 1fr;
            gap: 16px;
            align-items: center;
            background: #f9fafb;
            border: 1px solid var(--border);
            border-radius: 18px;
            padding: 16px;
        }

        img.demo-qr {
    width: 128px;
    height: 128px;
    border-radius: 14px;
    background: #fff;
    border: 6px solid #fff;
    box-shadow: inset 0 0 0 1px #d1d5db;
    object-fit: contain;
    display: block;
}

        .demo-row {
            display: flex;
            justify-content: space-between;
            gap: 14px;
            padding: 12px 0;
            border-bottom: 1px solid var(--border);
            font-size: 14px;
        }

        .demo-row:last-child {
            border-bottom: 0;
        }

        .demo-row span:first-child {
            color: var(--muted);
            font-weight: 700;
        }

        .demo-row span:last-child {
            font-weight: 900;
            color: var(--dark);
            text-align: right;
        }

        .address {
            word-break: break-all;
            font-family: Consolas, Monaco, monospace;
            font-size: 12px;
        }

        .section {
            padding: 70px 0;
        }

        .section-header {
            max-width: 760px;
            margin-bottom: 28px;
        }

        .section-header.center {
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }

        .section-header h2 {
            margin: 0;
            font-size: clamp(30px, 4vw, 44px);
            line-height: 1.05;
            letter-spacing: -0.06em;
            color: var(--dark);
        }

        .section-header p {
            margin: 14px 0 0;
            color: var(--muted);
            font-size: 17px;
        }

        .billing-toggle {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
            margin: 0 auto 26px;
            padding: 6px;
            border: 1px solid var(--border);
            border-radius: 999px;
            background: #f9fafb;
        }

        .billing-toggle button {
            border: 0;
            border-radius: 999px;
            padding: 10px 16px;
            background: transparent;
            color: var(--muted);
            font-size: 14px;
            font-weight: 900;
            cursor: pointer;
        }

        .billing-toggle button.active {
            background: var(--blue);
            color: #fff;
            box-shadow: 0 8px 18px rgba(37, 99, 235, 0.18);
        }

        .plan-set {
            display: none;
        }

        .plan-set.active {
            display: block;
        }

        .plan-saving {
            display: inline-flex;
            align-items: center;
            width: fit-content;
            margin: 0 0 8px;
            padding: 5px 9px;
            border-radius: 999px;
            background: #dcfce7;
            color: #166534;
            font-size: 12px;
            font-weight: 900;
        }

        .benefit-grid,
        .plans-grid,
        .faq-grid {
            display: grid;
            gap: 18px;
        }

        .benefit-grid {
            grid-template-columns: repeat(3, minmax(0, 1fr));
        }

        .plans-grid {
            grid-template-columns: repeat(4, minmax(0, 1fr));
            align-items: stretch;
        }

        .faq-grid {
            grid-template-columns: repeat(2, minmax(0, 1fr));
        }

        .benefit-card,
        .step-card,
        .plan-card,
        .faq-card {
            background: var(--card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            box-shadow: 0 10px 24px rgba(15, 23, 42, 0.04);
        }

        .benefit-card,
        .faq-card {
            padding: 22px;
        }

        .icon {
            width: 44px;
            height: 44px;
            border-radius: 14px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: #eff6ff;
            color: var(--blue);
            font-size: 21px;
            margin-bottom: 12px;
        }

        .benefit-card h3,
        .step-card h3,
        .plan-card h3,
        .faq-card h3 {
            margin: 0;
            font-size: 19px;
            letter-spacing: -0.03em;
            color: var(--dark);
        }

        .benefit-card p,
        .step-card p,
        .faq-card p {
            margin: 10px 0 0;
            color: var(--muted);
        }

        .steps {
            display: grid;
            grid-template-columns: repeat(4, minmax(0, 1fr));
            gap: 16px;
        }

        .step-card {
            padding: 20px;
        }

        .step-number {
            width: 34px;
            height: 34px;
            border-radius: 50%;
            background: var(--dark);
            color: #fff;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: 900;
            margin-bottom: 14px;
        }

        .plans-section {
            background: #fff;
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }

        .plan-card {
            padding: 22px;
            display: flex;
            flex-direction: column;
        }

        .plan-card.featured {
            border-color: rgba(37, 99, 235, 0.45);
            box-shadow: 0 18px 38px rgba(37, 99, 235, 0.12);
        }

        .plan-head {
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
            gap: 12px;
            margin-bottom: 12px;
        }

        .plan-badge {
            display: inline-flex;
            align-items: center;
            padding: 5px 9px;
            border-radius: 999px;
            background: #eff6ff;
            color: var(--blue);
            font-size: 12px;
            font-weight: 900;
            white-space: nowrap;
        }

        .price {
            display: flex;
            align-items: baseline;
            gap: 4px;
            margin: 12px 0 4px;
            color: var(--dark);
        }

        .price strong {
            font-size: 34px;
            letter-spacing: -0.06em;
        }

        .price span {
            color: var(--muted);
            font-size: 13px;
            font-weight: 800;
        }

        .plan-description {
            color: var(--muted);
            margin: 8px 0 16px;
            min-height: 52px;
        }

        .feature-list {
            list-style: none;
            padding: 0;
            margin: 0 0 18px;
            display: grid;
            gap: 10px;
        }

        .feature-list li {
            position: relative;
            padding-left: 24px;
            color: #374151;
            font-size: 14px;
            font-weight: 700;
        }

        .feature-list li::before {
            content: "✓";
            position: absolute;
            left: 0;
            top: 0;
            color: var(--green);
            font-weight: 900;
        }

        .plan-card .btn {
            margin-top: auto;
            width: 100%;
        }

        .notice {
            margin-top: 18px;
            padding: 14px 16px;
            border-radius: 14px;
            background: var(--yellow-soft);
            border: 1px solid #fed7aa;
            color: #9a3412;
            font-size: 14px;
            font-weight: 700;
        }

        .split {
            display: grid;
            grid-template-columns: 0.92fr 1.08fr;
            gap: 28px;
            align-items: start;
        }

        .tech-card {
            background: var(--dark);
            color: #fff;
            border-radius: 24px;
            padding: 24px;
            box-shadow: var(--shadow);
        }

        .tech-card h3 {
            margin: 0;
            font-size: 24px;
            letter-spacing: -0.04em;
        }

        .tech-list {
            margin: 18px 0 0;
            padding: 0;
            list-style: none;
            display: grid;
            gap: 12px;
        }

        .tech-list li {
            padding: 13px;
            border-radius: 14px;
            background: rgba(255,255,255,0.08);
            color: #e5e7eb;
        }

        .cta {
            padding: 70px 0;
            background:
                radial-gradient(circle at 10% 20%, rgba(96, 165, 250, 0.22), transparent 30%),
                linear-gradient(135deg, #111827, #1f2937);
            color: #fff;
            text-align: center;
        }

        .cta h2 {
            margin: 0;
            font-size: clamp(32px, 5vw, 50px);
            letter-spacing: -0.06em;
            line-height: 1.05;
        }

        .cta p {
            color: #d1d5db;
            max-width: 720px;
            margin: 16px auto 0;
            font-size: 17px;
        }

        .cta-actions {
            display: flex;
            justify-content: center;
            gap: 12px;
            flex-wrap: wrap;
            margin-top: 26px;
        }

        .footer {
            background: #fff;
            border-top: 1px solid var(--border);
            padding: 28px 0;
            color: var(--muted);
            font-size: 14px;
        }

        .footer-inner {
            display: flex;
            justify-content: space-between;
            gap: 18px;
            flex-wrap: wrap;
        }

        @media (max-width: 1040px) {
            .hero-grid,
            .split {
                grid-template-columns: 1fr;
            }

            .plans-grid,
            .steps {
                grid-template-columns: repeat(2, minmax(0, 1fr));
            }
        }

        @media (max-width: 760px) {
            .header-inner {
                align-items: flex-start;
                flex-direction: column;
                padding: 16px 0;
            }

            .nav {
                width: 100%;
                overflow-x: auto;
                padding-bottom: 4px;
                flex-wrap: wrap;
            }

            .hero {
                padding-top: 48px;
            }

            .hero-points,
            .benefit-grid,
            .plans-grid,
            .steps,
            .faq-grid {
                grid-template-columns: 1fr;
            }

            .qr-box {
                grid-template-columns: 1fr;
            }

            .demo-qr {
               margin: 0 auto;
            }

            .section {
                padding: 48px 0;
            }
        }