:root {
            --i0yps4-primary: #0078d4;
            --i0yps4-secondary: #f3f2f1;
            --i0yps4-accent: #d13438;
            --i0yps4-dark: #201f1e;
            --i0yps4-text: #323130;
            --i0yps4-bg: #ffffff;
            --i0yps4-card-shadow: 0 4px 12px rgba(0,0,0,0.08);
            --i0yps4-kbd-bg: #faf9f8;
        }

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

        body {
            font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
            color: var(--i0yps4-text);
            line-height: 1.6;
            background-color: #f8f9fa;
            overflow-x: hidden;
        }

        /* 导航栏 */
        .i0yps4-navbar {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 72px;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            z-index: 1000;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .i0yps4-nav-container {
            width: 95%;
            max-width: 1300px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

        .i0yps4-logo {
            flex: 0 0 auto;
            min-width: 0;
        }

        .i0yps4-logo img {
            height: 40px;
            display: block;
        }

        .i0yps4-nav-menu {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
            min-width: 0;
        }

        .i0yps4-nav-menu li {
            margin-left: 16px;
        }

        .i0yps4-nav-menu a {
            text-decoration: none;
            color: var(--i0yps4-dark);
            font-size: 0.95rem;
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 6px;
            transition: all 0.3s ease;
        }

        .i0yps4-nav-menu a:hover {
            color: var(--i0yps4-primary);
            background: var(--i0yps4-secondary);
        }

        .i0yps4-nav-menu a.i0yps4-active {
            color: var(--i0yps4-primary);
            background: rgba(0, 120, 212, 0.1);
        }

        /* Hero 区块 */
        .i0yps4-hero {
            padding: 140px 24px 80px;
            background: linear-gradient(135deg, #001a33 0%, #004578 100%);
            color: white;
            text-align: center;
            clip-path: polygon(0 0, 100% 0, 100% 85%, 0 100%);
        }

        .i0yps4-hero-content {
            max-width: 900px;
            margin: 0 auto;
        }

        .i0yps4-hero h1 {
            font-size: clamp(2rem, 4vw + 1rem, 3.5rem);
            line-height: 1.2;
            margin-bottom: 24px;
            word-break: keep-all;
        }

        .i0yps4-hero p {
            font-size: clamp(1rem, 1.5vw + 0.5rem, 1.25rem);
            opacity: 0.9;
            margin-bottom: 32px;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
            word-break: break-word;
        }

        /* 快捷键布局 */
        .i0yps4-main-content {
            width: 90vw;
            max-width: 1100px;
            margin: -60px auto 64px;
            position: relative;
            z-index: 10;
        }

        .i0yps4-shortcut-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 24px;
        }

        .i0yps4-card {
            background: white;
            border-radius: 16px;
            padding: 32px;
            box-shadow: var(--i0yps4-card-shadow);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            min-width: 0;
            border: 1px solid rgba(0,0,0,0.03);
        }

        .i0yps4-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 24px rgba(0,0,0,0.12);
        }

        .i0yps4-card-title {
            font-size: 1.5rem;
            color: var(--i0yps4-primary);
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            border-bottom: 2px solid var(--i0yps4-secondary);
            padding-bottom: 12px;
        }

        .i0yps4-list {
            list-style: none;
        }

        .i0yps4-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 12px 0;
            border-bottom: 1px solid #f0f0f0;
            word-break: break-word;
        }

        .i0yps4-item:last-child {
            border-bottom: none;
        }

        .i0yps4-key-label {
            font-weight: 500;
            color: var(--i0yps4-dark);
            padding-right: 16px;
            flex: 1;
        }

        .i0yps4-key-combo {
            display: flex;
            gap: 4px;
            flex-wrap: wrap;
            justify-content: flex-end;
            min-width: 0;
        }

        kbd {
            background-color: var(--i0yps4-kbd-bg);
            border: 1px solid #d1d1d1;
            border-radius: 4px;
            box-shadow: 0 2px 0 #d1d1d1;
            color: var(--i0yps4-dark);
            display: inline-block;
            font-family: "Consolas", monospace;
            font-size: 0.85rem;
            font-weight: 600;
            line-height: 1;
            padding: 4px 8px;
            white-space: nowrap;
        }

        /* 效率提示区块 */
        .i0yps4-tips-section {
            background: #ffffff;
            padding: 64px 0;
            margin-top: 48px;
            border-radius: 24px;
            box-shadow: inset 0 0 20px rgba(0,0,0,0.02);
        }

        .i0yps4-section-title {
            text-align: center;
            font-size: 2.25rem;
            margin-bottom: 48px;
            color: var(--i0yps4-dark);
        }

        .i0yps4-tip-item {
            display: flex;
            align-items: flex-start;
            padding: 24px;
            background: var(--i0yps4-secondary);
            border-radius: 12px;
            margin-bottom: 16px;
            min-width: 0;
        }

        .i0yps4-tip-content {
            margin-left: 16px;
            min-width: 0;
        }

        .i0yps4-tip-content h4 {
            font-size: 1.2rem;
            margin-bottom: 8px;
            color: var(--i0yps4-primary);
        }

        /* 动态内容 */
        .i0yps4-dynamic-wrapper {
            max-width: 1100px;
            margin: 64px auto;
            padding: 0 24px;
        }

        /* 页脚 */
        .i0yps4-footer {
            background: var(--i0yps4-dark);
            color: #d1d1d1;
            padding: 64px 24px 32px;
            margin-top: 96px;
        }

        .i0yps4-footer-grid {
            max-width: 1100px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            flex-wrap: wrap;
        }

        .i0yps4-footer-brand h2 {
            color: white;
            margin-bottom: 16px;
            font-size: 1.5rem;
        }

        .i0yps4-footer-links h3 {
            color: white;
            margin-bottom: 20px;
            font-size: 1.1rem;
        }

        .i0yps4-footer-links ul {
            list-style: none;
        }

        .i0yps4-footer-links li {
            margin-bottom: 12px;
        }

        .i0yps4-footer-links a {
            color: #a1a1a1;
            text-decoration: none;
            transition: color 0.3s;
        }

        .i0yps4-footer-links a:hover {
            color: white;
        }

        .i0yps4-copyright {
            text-align: center;
            margin-top: 64px;
            padding-top: 32px;
            border-top: 1px solid #333;
            font-size: 0.85rem;
        }

        /* 响应式调整 */
        @media (max-width: 768px) {
            .i0yps4-navbar {
                height: auto;
                padding: 12px 0;
            }
            .i0yps4-nav-container {
                flex-direction: column;
                gap: 12px;
            }
            .i0yps4-nav-menu {
                justify-content: center;
                gap: 8px;
            }
            .i0yps4-nav-menu li {
                margin: 0;
            }
            .i0yps4-hero {
                padding-top: 180px;
            }
            .i0yps4-shortcut-grid {
                grid-template-columns: 1fr;
            }
            .i0yps4-item {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
            .i0yps4-key-combo {
                justify-content: flex-start;
            }
        }