:root {
    --primary: #0ea5e9;
    --primary-hover: #0284c7;
    --accent: #38bdf8;
    --text-dark: #0f172a;
    --text-gray: #475569;
    --bg-light: #f0f9ff;
    --bg-white: #ffffff;
    --shadow-fast: 0 10px 30px -10px rgba(14, 165, 233, 0.3);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { 
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif; 
    color: var(--text-dark);
    background-color: var(--bg-white);
    line-height: 1.6;
    overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; position: relative; }

/* 导航栏 */
header {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    position: sticky; top: 0; z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}
.nav-inner { display: flex; justify-content: space-between; align-items: center; height: 70px; }
.logo { font-size: 24px; font-weight: 800; color: var(--primary); font-style: italic; letter-spacing: -1px; }
.nav-links { display: flex; gap: 30px; }
.nav-links a { font-weight: 600; font-size: 15px; color: var(--text-gray); transition: 0.2s; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); transform: translateX(2px); }

/* 极速按钮 */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 12px 36px; border-radius: 30px; font-weight: 700; font-size: 16px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1); cursor: pointer;
    font-style: italic;
}
.btn-primary { 
    background: linear-gradient(135deg, var(--accent), var(--primary)); color: #fff; 
    box-shadow: var(--shadow-fast); border: none;
}
.btn-primary:hover { transform: translateY(-3px) scale(1.02); box-shadow: 0 15px 35px -10px rgba(14, 165, 233, 0.5); }
.btn-outline { 
    background: transparent; color: var(--primary); 
    border: 2px solid var(--primary); 
}
.btn-outline:hover { background: var(--bg-light); transform: translateY(-3px); }

/* 飞行轨迹背景 */
.speed-bg {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: -1;
    background: 
        linear-gradient(105deg, transparent 40%, rgba(14, 165, 233, 0.05) 45%, transparent 50%),
        linear-gradient(105deg, transparent 60%, rgba(14, 165, 233, 0.08) 65%, transparent 70%);
    background-size: 200% 100%;
    animation: fly 10s infinite linear;
}
@keyframes fly { 0% { background-position: 100% 0; } 100% { background-position: -100% 0; } }

/* Hero 区 */
.hero {
    padding: 120px 0 80px; text-align: center; position: relative;
    background: var(--bg-light); overflow: hidden;
}
.hero h1 { font-size: 56px; font-weight: 900; color: #0f172a; margin-bottom: 20px; font-style: italic; transform: skewX(-5deg); }
.hero p { font-size: 20px; color: var(--text-gray); margin-bottom: 40px; }
.hero-btns { display: flex; justify-content: center; gap: 20px; margin-bottom: 60px; }
.browser-window {
    max-width: 900px; margin: 0 auto;
    border-radius: 12px; overflow: hidden;
    box-shadow: var(--shadow-fast);
    border: 1px solid rgba(14, 165, 233, 0.2);
    background: #fff;
    transform: perspective(1000px) rotateX(2deg);
    transition: transform 0.5s;
}
.browser-window:hover { transform: perspective(1000px) rotateX(0deg); }
.browser-header { height: 32px; background: #f8fafc; border-bottom: 1px solid #e2e8f0; display: flex; align-items: center; padding: 0 16px; gap: 8px; }
.dot { width: 10px; height: 10px; border-radius: 50%; background: #cbd5e1; }

/* 通用模块 */
section { padding: 80px 0; position: relative; }
.section-title { text-align: center; font-size: 36px; font-weight: 800; margin-bottom: 50px; font-style: italic; }

/* 核心卖点 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.feature-card {
    background: #fff; padding: 30px 20px; border-radius: 12px; text-align: center;
    border: 1px solid #f1f5f9; transition: 0.3s;
}
.feature-card:hover { border-color: var(--primary); transform: translateY(-5px); box-shadow: var(--shadow-fast); }
.feature-card img { width: 50px; height: 50px; margin: 0 auto 15px; }
.feature-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.feature-card p { font-size: 14px; color: var(--text-gray); }

/* 功能详情 */
.detail-item { display: flex; align-items: center; gap: 50px; margin-bottom: 80px; }
.detail-item:nth-child(even) { flex-direction: row-reverse; }
.detail-text { flex: 1; }
.detail-text h3 { font-size: 28px; font-weight: 800; margin-bottom: 15px; font-style: italic; color: var(--primary); }
.detail-text p { font-size: 16px; color: var(--text-gray); line-height: 1.8; }
.detail-img { flex: 1; border-radius: 12px; overflow: hidden; box-shadow: 0 10px 20px rgba(0,0,0,0.05); }

/* 对比区 */
.compare-box { background: #fff; border-radius: 16px; box-shadow: 0 5px 15px rgba(0,0,0,0.05); overflow: hidden; border: 1px solid #e2e8f0; }
.compare-table { width: 100%; border-collapse: collapse; }
.compare-table th, .compare-table td { padding: 20px; text-align: center; border-bottom: 1px solid #e2e8f0; }
.compare-table th { background: #f8fafc; font-weight: 700; }
.highlight { color: var(--primary); font-weight: 700; background: var(--bg-light); }

/* 版本区 */
.versions { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.v-card { padding: 40px 30px; text-align: center; border-radius: 16px; border: 2px solid #e2e8f0; transition: 0.3s; background: #fff; }
.v-card:hover { border-color: var(--primary); transform: translateY(-5px); box-shadow: var(--shadow-fast); }
.v-card h3 { font-size: 24px; font-weight: 800; margin-bottom: 15px; font-style: italic; }
.v-card p { color: var(--text-gray); margin-bottom: 30px; height: 48px; }

/* 数据背书 */
.data-sec { background: var(--bg-light); border-top: 1px solid #e2e8f0; border-bottom: 1px solid #e2e8f0; }
.stats-flex { display: flex; justify-content: space-around; text-align: center; flex-wrap: wrap; }
.stat { padding: 20px; }
.stat h4 { font-size: 48px; font-weight: 900; color: var(--primary); font-style: italic; margin-bottom: 5px; }
.stat p { font-size: 16px; color: var(--text-gray); font-weight: 600; }

/* FAQ */
.faq-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.faq-item { background: #f8fafc; padding: 20px; border-radius: 12px; }
.faq-item h4 { font-size: 16px; font-weight: 700; color: var(--text-dark); margin-bottom: 10px; }
.faq-item p { font-size: 14px; color: var(--text-gray); }

footer { background: #0f172a; color: #94a3b8; text-align: center; padding: 40px 0; font-size: 14px; }