:root {
            --ysa473-primary: #0060df;
            --ysa473-primary-hover: #003eaa;
            --ysa473-secondary: #ff7139;
            --ysa473-dark: #0b0838;
            --ysa473-light: #f9f9fb;
            --ysa473-text: #20123a;
            --ysa473-text-muted: #5b5b66;
            --ysa473-white: #ffffff;
            --ysa473-border: #e0e0e0;
            --ysa473-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            --ysa473-radius: 16px;
            --ysa473-max-width: 1320px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            color: var(--ysa473-text);
            line-height: 1.6;
            background-color: var(--ysa473-light);
            word-break: break-word;
            overflow-x: hidden;
        }

        /* Navigation */
        .ysa473-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--ysa473-border);
            transition: box-shadow 0.3s ease;
        }

        .ysa473-nav-container {
            max-width: var(--ysa473-max-width);
            margin: 0 auto;
            padding: 16px 24px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
        }

        .ysa473-logo {
            flex: 0 0 auto;
            min-width: 0;
            display: flex;
            align-items: center;
        }

        .ysa473-logo img {
            height: 40px;
            width: auto;
        }

        .ysa473-nav-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 8px;
            min-width: 0;
        }

        .ysa473-nav-item a {
            text-decoration: none;
            color: var(--ysa473-text);
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 8px;
            transition: all 0.2s ease;
            font-size: 0.95rem;
            display: block;
        }

        .ysa473-nav-item a:hover {
            background-color: rgba(0, 96, 223, 0.1);
            color: var(--ysa473-primary);
        }

        .ysa473-nav-item a.ysa473-active {
            background-color: var(--ysa473-primary);
            color: var(--ysa473-white);
        }

        /* Hero Section */
        .ysa473-hero {
            padding: 96px 24px;
            background: linear-gradient(135deg, var(--ysa473-dark) 0%, #1a1a4b 100%);
            color: var(--ysa473-white);
            position: relative;
            overflow: hidden;
            text-align: center;
        }

        .ysa473-hero-content {
            max-width: 900px;
            margin: 0 auto;
            position: relative;
            z-index: 2;
        }

        .ysa473-hero h1 {
            font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
            font-weight: 800;
            line-height: 1.1;
            margin-bottom: 24px;
            letter-spacing: -0.02em;
        }

        .ysa473-hero p {
            font-size: clamp(1.1rem, 1.5vw + 0.5rem, 1.5rem);
            opacity: 0.9;
            margin-bottom: 48px;
            line-height: 1.5;
        }

        .ysa473-f12-key {
            display: inline-block;
            padding: 32px 64px;
            background: rgba(255, 255, 255, 0.1);
            border: 2px solid rgba(255, 255, 255, 0.2);
            border-radius: 24px;
            font-size: 5rem;
            font-weight: 900;
            box-shadow: 0 20px 50px rgba(0,0,0,0.3);
            margin-bottom: 24px;
            transition: transform 0.3s ease;
            cursor: pointer;
        }

        .ysa473-f12-key:hover {
            transform: translateY(-10px);
            background: rgba(255, 255, 255, 0.15);
        }

        /* Section Styling */
        .ysa473-section {
            padding: 96px 24px;
            max-width: var(--ysa473-max-width);
            margin: 0 auto;
        }

        .ysa473-section-title {
            margin-bottom: 48px;
            text-align: center;
        }

        .ysa473-section-title h2 {
            font-size: clamp(2rem, 3vw + 0.5rem, 2.8rem);
            margin-bottom: 16px;
        }

        /* Grid Layouts */
        .ysa473-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
        }

        .ysa473-card {
            background: var(--ysa473-white);
            padding: 40px;
            border-radius: var(--ysa473-radius);
            box-shadow: var(--ysa473-shadow);
            transition: all 0.3s ease;
            border: 1px solid var(--ysa473-border);
            min-width: 0;
        }

        .ysa473-card:hover {
            transform: translateY(-8px);
            border-color: var(--ysa473-primary);
        }

        .ysa473-card-icon {
            font-size: 3rem;
            margin-bottom: 24px;
            display: block;
        }

        .ysa473-card h3 {
            font-size: 1.5rem;
            margin-bottom: 16px;
            color: var(--ysa473-primary);
        }

        /* Shortcuts Table */
        .ysa473-table-wrapper {
            overflow-x: auto;
            background: var(--ysa473-white);
            border-radius: var(--ysa473-radius);
            box-shadow: var(--ysa473-shadow);
            margin-top: 48px;
        }

        .ysa473-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
        }

        .ysa473-table th, .ysa473-table td {
            padding: 20px 24px;
            border-bottom: 1px solid var(--ysa473-border);
        }

        .ysa473-table th {
            background: #f8f9fa;
            font-weight: 700;
            color: var(--ysa473-dark);
        }

        .ysa473-kbd {
            background: #f1f3f5;
            border: 1px solid #ced4da;
            border-radius: 4px;
            padding: 2px 8px;
            font-family: monospace;
            font-size: 0.9em;
            box-shadow: 0 2px 0 #ced4da;
        }

        /* CTA Section */
        .ysa473-cta {
            background: var(--ysa473-primary);
            color: var(--ysa473-white);
            text-align: center;
            padding: 80px 24px;
            border-radius: var(--ysa473-radius);
            margin: 0 24px 96px;
        }

        .ysa473-btn {
            display: inline-block;
            padding: 16px 40px;
            background: var(--ysa473-white);
            color: var(--ysa473-primary);
            text-decoration: none;
            font-weight: 700;
            border-radius: 50px;
            transition: all 0.3s ease;
            margin-top: 32px;
        }

        .ysa473-btn:hover {
            transform: scale(1.05);
            box-shadow: 0 10px 20px rgba(0,0,0,0.2);
        }

        /* Footer */
        .ysa473-footer {
            background: var(--ysa473-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 64px 24px;
        }

        .ysa473-footer-content {
            max-width: var(--ysa473-max-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
        }

        .ysa473-footer-brand {
            flex: 1 1 300px;
            min-width: 0;
        }

        .ysa473-footer-brand h4 {
            color: var(--ysa473-white);
            font-size: 1.5rem;
            margin-bottom: 16px;
        }

        .ysa473-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            flex: 2 1 600px;
            min-width: 0;
        }

        .ysa473-footer-column {
            flex: 1 1 150px;
            min-width: 0;
        }

        .ysa473-footer-column h5 {
            color: var(--ysa473-white);
            margin-bottom: 20px;
        }

        .ysa473-footer-column ul {
            list-style: none;
        }

        .ysa473-footer-column ul li {
            margin-bottom: 12px;
        }

        .ysa473-footer-column a {
            color: inherit;
            text-decoration: none;
            transition: color 0.2s;
        }

        .ysa473-footer-column a:hover {
            color: var(--ysa473-secondary);
        }

        .ysa473-footer-bottom {
            max-width: var(--ysa473-max-width);
            margin: 48px auto 0;
            padding-top: 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            text-align: center;
            font-size: 0.9rem;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .ysa473-nav-menu {
                justify-content: center;
                margin-top: 16px;
                width: 100%;
            }
            .ysa473-nav-container {
                justify-content: center;
            }
        }

        @media (max-width: 768px) {
            .ysa473-grid {
                grid-template-columns: 1fr;
            }
            .ysa473-hero h1 {
                font-size: 3rem;
            }
            .ysa473-section {
                padding: 64px 24px;
            }
        }