:root {
    --bg-main: #F0F4F8;
    --text-dark: #1E293B;
    --text-muted: #64748B;
    --primary-3d: #3B82F6;
    --primary-light: #60A5FA;
    --primary-dark: #1D4ED8;
    --shadow-3d: 
        0px 10px 0px var(--primary-dark),
        0px 15px 20px rgba(0,0,0,0.2);
    --shadow-3d-active: 
        0px 2px 0px var(--primary-dark),
        0px 4px 10px rgba(0,0,0,0.1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: 'Poppins', "Microsoft YaHei", -apple-system, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-dark);
    line-height: 1.6;
    /* 弱几何3D背景 */
    background-image: 
        linear-gradient(45deg, rgba(59, 130, 246, 0.03) 25%, transparent 25%, transparent 75%, rgba(59, 130, 246, 0.03) 75%, rgba(59, 130, 246, 0.03)),
        linear-gradient(45deg, rgba(59, 130, 246, 0.03) 25%, transparent 25%, transparent 75%, rgba(59, 130, 246, 0.03) 75%, rgba(59, 130, 246, 0.03));
    background-size: 60px 60px;
    background-position: 0 0, 30px 30px;
    overflow-x: hidden;
}

a { text-decoration: none; color: inherit; transition: 0.2s; }
img { max-width: 100%; display: block; border-radius: 12px; }

/* 3D 悬浮导航 */
.header {
    background-color: #FFFFFF;
    border-bottom: 3px solid #E2E8F0;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    position: sticky; top: 0; z-index: 1000;
}
.nav-wrap { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; padding: 15px 20px; }
.logo { font-size: 24px; font-weight: 900; color: var(--text-dark); display: flex; align-items: center; gap: 12px; letter-spacing: -0.5px; }
/* 伪 3D 图标 */
.logo-icon { width: 44px; height: 44px; border-radius: 12px; background: linear-gradient(135deg, var(--primary-light), var(--primary-3d)); box-shadow: 0 4px 0 var(--primary-dark); padding: 4px; border: 2px solid #FFF; }
.nav-links { display: flex; gap: 30px; }
.nav-links a { font-size: 16px; font-weight: 700; color: var(--text-muted); position: relative; padding: 5px 10px; }
.nav-links a:hover, .nav-links a.active { color: var(--primary-3d); transform: translateY(-2px); }
.nav-links a.active::after { content: ''; position: absolute; bottom: -5px; left: 10px; right: 10px; height: 4px; background: var(--primary-3d); border-radius: 2px; }

/* 超强 3D 立体按钮 */
.btn {
    display: inline-flex; align-items: center; justify-content: center; padding: 16px 40px;
    border-radius: 16px; font-size: 20px; font-weight: 800; cursor: pointer; transition: 0.1s ease;
    border: none; outline: none; position: relative; top: 0; letter-spacing: 1px;
}
.btn-primary {
    background: linear-gradient(180deg, var(--primary-light), var(--primary-3d));
    color: #FFF; box-shadow: var(--shadow-3d);
}
.btn-primary:active { top: 8px; box-shadow: var(--shadow-3d-active); }
.btn-outline {
    background: linear-gradient(180deg, #FFFFFF, #F1F5F9);
    color: var(--primary-3d); border: 2px solid #E2E8F0;
    box-shadow: 0px 8px 0px #CBD5E1, 0px 12px 15px rgba(0,0,0,0.1);
}
.btn-outline:active { top: 6px; box-shadow: 0px 2px 0px #CBD5E1, 0px 4px 5px rgba(0,0,0,0.1); }

/* 3D 箭头特效 (放入下载按钮) */
.btn .arrow { display: inline-block; margin-left: 10px; transition: 0.2s; font-size: 24px; }
.btn:hover .arrow { transform: translateY(4px); }

/* 通用容器 */
.container { max-width: 1200px; margin: 0 auto; padding: 80px 20px; position: relative; }
.sec-title { text-align: center; font-size: 42px; font-weight: 900; color: var(--text-dark); margin-bottom: 15px; text-shadow: 2px 2px 0 #CBD5E1; }
.sec-subtitle { text-align: center; font-size: 18px; color: var(--text-muted); font-weight: 600; margin-bottom: 60px; }

/* 3D 立体卡片 */
.card-3d {
    background: #FFFFFF; border-radius: 20px; border: 2px solid #E2E8F0;
    box-shadow: 0 15px 0 #E2E8F0, 0 20px 25px rgba(0,0,0,0.05);
    transition: 0.2s ease; position: relative; top: 0;
}
.card-3d:hover { top: 5px; box-shadow: 0 10px 0 #E2E8F0, 0 15px 20px rgba(0,0,0,0.08); border-color: var(--primary-light); }

/* Hero区 */
.hero { text-align: center; padding: 80px 20px 120px; }
.hero h1 { font-size: 64px; font-weight: 900; color: var(--text-dark); margin-bottom: 20px; line-height: 1.1; text-shadow: 3px 3px 0 #CBD5E1, 6px 6px 0 rgba(0,0,0,0.05); }
.hero .subtitle { font-size: 26px; font-weight: 800; color: var(--primary-3d); margin-bottom: 50px; text-shadow: 1px 1px 0 rgba(0,0,0,0.1); }
.hero-btns { display: flex; justify-content: center; gap: 30px; margin-bottom: 80px; }
/* 3D透视容器展示图 */
.hero-visual { max-width: 900px; margin: 0 auto; perspective: 1200px; }
.hero-visual img { 
    border: 8px solid #FFF; border-radius: 24px; 
    box-shadow: 0 30px 0 #E2E8F0, 0 40px 40px rgba(0,0,0,0.15);
    transform: rotateX(10deg); transition: transform 0.5s ease; 
}
.hero-visual:hover img { transform: rotateX(0deg); box-shadow: 0 10px 0 #E2E8F0, 0 15px 20px rgba(0,0,0,0.1); }

/* 核心卖点 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 25px; }
.f-box { text-align: center; padding: 40px 15px; }
.f-icon-wrap { 
    width: 80px; height: 80px; margin: 0 auto 25px; border-radius: 20px; 
    background: linear-gradient(135deg, #FFF, #F8FAFC); border: 2px solid #E2E8F0;
    box-shadow: 0 8px 0 #CBD5E1; display: flex; align-items: center; justify-content: center;
    transition: 0.2s; position: relative; top: 0;
}
.f-box:hover .f-icon-wrap { top: 4px; box-shadow: 0 4px 0 #CBD5E1; }
.f-box img { width: 40px; height: 40px; filter: drop-shadow(2px 2px 0px rgba(0,0,0,0.1)); }
.f-box h3 { font-size: 18px; font-weight: 800; margin-bottom: 10px; color: var(--text-dark); }
.f-box p { font-size: 14px; font-weight: 600; color: var(--text-muted); }

/* 功能详情 */
.detail-item { display: flex; align-items: center; gap: 80px; margin-bottom: 100px; }
.detail-item:nth-child(even) { flex-direction: row-reverse; }
.d-text { flex: 1; }
.d-text h3 { font-size: 36px; font-weight: 900; margin-bottom: 20px; color: var(--primary-3d); text-shadow: 2px 2px 0 #BFDBFE; }
.d-text p { font-size: 18px; font-weight: 600; color: var(--text-muted); margin-bottom: 30px; line-height: 1.8; }
.d-data { display: inline-block; padding: 12px 24px; background: #FFF; border: 2px solid #E2E8F0; box-shadow: 0 6px 0 #CBD5E1; border-radius: 16px; font-weight: 800; font-size: 18px; color: var(--text-dark); }
.d-visual { flex: 1; padding: 10px; background: #FFF; border: 2px solid #E2E8F0; border-radius: 24px; box-shadow: 0 20px 0 #CBD5E1; transform: rotate(-2deg); }
.detail-item:nth-child(even) .d-visual { transform: rotate(2deg); box-shadow: -20px 20px 0 #CBD5E1; }
.d-visual img { border: 2px solid #F1F5F9; }

/* 浏览器对比 */
.compare-box { padding: 30px; }
.compare-table { width: 100%; border-collapse: collapse; text-align: left; }
.compare-table th, .compare-table td { padding: 25px 20px; border-bottom: 2px solid #E2E8F0; }
.compare-table th { font-weight: 900; color: var(--text-muted); font-size: 18px; text-transform: uppercase; }
.compare-table td { font-weight: 700; font-size: 16px; }
.compare-table .hl { color: var(--primary-3d); font-size: 20px; font-weight: 900; }
.compare-table tr:last-child td { border-bottom: none; }

/* 数据背书 */
.data-sec { background: var(--primary-3d); border-top: 4px solid var(--primary-dark); border-bottom: 12px solid var(--primary-dark); padding: 80px 0; margin: 80px 0; color: #FFF; }
.data-inner { max-width: 1000px; margin: 0 auto; display: flex; justify-content: space-around; align-items: center; text-align: center; }
.data-item h4 { font-size: 64px; font-weight: 900; text-shadow: 0 8px 0 var(--primary-dark); margin-bottom: 15px; line-height: 1; }
.data-item p { font-size: 18px; font-weight: 800; background: rgba(0,0,0,0.2); display: inline-block; padding: 6px 16px; border-radius: 12px; box-shadow: 0 4px 0 var(--primary-dark); }
.data-icon { width: 100px; height: 100px; background: #FFF; border-radius: 24px; padding: 20px; box-shadow: 0 10px 0 var(--primary-dark); }
.data-icon img { filter: brightness(0) saturate(100%) invert(43%) sepia(85%) saturate(2250%) hue-rotate(205deg) brightness(98%) contrast(93%); }

/* 下载版本区 */
.dl-wrap { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.dl-card { padding: 50px 30px; text-align: center; }
.dl-card h3 { font-size: 28px; font-weight: 900; color: var(--text-dark); margin-bottom: 15px; }
.dl-card p { font-size: 16px; font-weight: 600; color: var(--text-muted); margin-bottom: 40px; height: 48px; }
.dl-card .btn { width: 100%; font-size: 18px; padding: 18px; }

/* FAQ */
.faq-wrap { max-width: 900px; margin: 0 auto; }
.faq-item { margin-bottom: 30px; padding: 30px; }
.faq-item h4 { font-size: 20px; font-weight: 800; color: var(--text-dark); margin-bottom: 15px; display: flex; align-items: flex-start; gap: 15px; }
.faq-item h4::before { content: "Q"; background: var(--primary-3d); color: #FFF; width: 32px; height: 32px; display: inline-flex; align-items: center; justify-content: center; border-radius: 8px; box-shadow: 0 4px 0 var(--primary-dark); flex-shrink: 0; }
.faq-item p { font-size: 16px; font-weight: 600; color: var(--text-muted); padding-left: 47px; line-height: 1.7; }

/* Footer */
.footer { background: #FFF; border-top: 4px solid #E2E8F0; padding: 50px 20px; text-align: center; font-weight: 700; color: var(--text-muted); margin-top: 80px; box-shadow: 0 -10px 20px rgba(0,0,0,0.02); }