:root {
    --bg-black: #000000;
    --bg-surface: #0A0A0C;
    --text-white: #FFFFFF;
    --text-gray: #A0AAB5;
    --accent-blue: #007AFF;
    --accent-cyan: #00E5FF;
    --stage-glow: rgba(0, 229, 255, 0.15);
    --border-dark: rgba(255, 255, 255, 0.1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, "Microsoft YaHei", sans-serif;
    background-color: var(--bg-black);
    color: var(--text-white);
    line-height: 1.6;
    position: relative;
    overflow-x: hidden;
}

/* 科技舞台灯光背景 */
.stage-light {
    position: absolute; top: 0; left: 0; width: 100%; height: 100vh;
    background: radial-gradient(circle at 50% 0%, var(--stage-glow) 0%, transparent 60%);
    z-index: -1; pointer-events: none;
}
.stage-light-bottom {
    position: absolute; bottom: 0; left: 0; width: 100%; height: 50vh;
    background: radial-gradient(circle at 50% 100%, rgba(0, 122, 255, 0.1) 0%, transparent 70%);
    z-index: -1; pointer-events: none;
}

a { text-decoration: none; color: inherit; transition: 0.3s ease; }
img { max-width: 100%; display: block; border-radius: 12px; }

/* 导航 */
.header {
    background-color: rgba(0, 0, 0, 0.8); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-dark); 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: 18px 24px; }
.logo { font-size: 20px; font-weight: 700; color: var(--text-white); display: flex; align-items: center; gap: 12px; letter-spacing: 1px; }
.logo-icon { width: 32px; height: 32px; border-radius: 8px; box-shadow: 0 0 10px var(--stage-glow); }
.nav-links { display: flex; gap: 32px; }
.nav-links a { font-size: 14px; font-weight: 500; color: var(--text-gray); text-transform: uppercase; letter-spacing: 1px; }
.nav-links a:hover, .nav-links a.active { color: var(--text-white); }

/* 发布会按钮 */
.btn {
    display: inline-flex; align-items: center; justify-content: center; padding: 16px 40px;
    border-radius: 40px; font-size: 16px; font-weight: 600; cursor: pointer; transition: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    letter-spacing: 1px;
}
.btn-primary {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
    color: #000; box-shadow: 0 8px 24px rgba(0, 229, 255, 0.3); border: none;
}
.btn-primary:hover {
    box-shadow: 0 12px 32px rgba(0, 229, 255, 0.5); transform: scale(1.02); filter: brightness(1.1);
}
.btn-outline {
    background: transparent; color: var(--text-white); border: 1px solid rgba(255, 255, 255, 0.3);
}
.btn-outline:hover { background: rgba(255, 255, 255, 0.1); border-color: #FFF; }

/* 通用容器 */
.container { max-width: 1200px; margin: 0 auto; padding: 100px 20px; position: relative; z-index: 1; }
.sec-title { 
    text-align: center; font-size: 48px; font-weight: 700; margin-bottom: 20px; 
    background: linear-gradient(180deg, #FFFFFF 0%, #A0AAB5 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; letter-spacing: -0.5px;
}
.sec-subtitle { text-align: center; font-size: 20px; color: var(--text-gray); margin-bottom: 80px; font-weight: 400; }

/* Hero区 */
.hero { text-align: center; padding: 120px 20px 80px; position: relative; }
.hero h1 { 
    font-size: 80px; font-weight: 800; margin-bottom: 24px; letter-spacing: -2px; line-height: 1.1;
    background: linear-gradient(180deg, #FFFFFF 0%, rgba(255, 255, 255, 0.7) 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.hero .subtitle { font-size: 28px; color: var(--accent-cyan); font-weight: 500; margin-bottom: 50px; letter-spacing: 2px; }
.hero-btns { display: flex; justify-content: center; gap: 24px; margin-bottom: 80px; }
.hero-visual { max-width: 1000px; margin: 0 auto; position: relative; perspective: 1000px; }
.hero-visual img { 
    border-radius: 20px; border: 1px solid rgba(255, 255, 255, 0.15); 
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.8), 0 0 40px var(--stage-glow);
    transform: rotateX(5deg); transition: transform 0.5s ease;
}
.hero-visual:hover img { transform: rotateX(0deg); }

/* 核心卖点 */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; }
.f-box { text-align: center; padding: 40px 20px; background: var(--bg-surface); border: 1px solid var(--border-dark); border-radius: 24px; transition: 0.3s; }
.f-box:hover { background: rgba(255, 255, 255, 0.05); transform: translateY(-5px); border-color: rgba(255, 255, 255, 0.3); }
.f-icon { width: 64px; height: 64px; margin: 0 auto 24px; display: flex; align-items: center; justify-content: center; }
.f-box img { width: 48px; height: 48px; filter: drop-shadow(0 0 10px rgba(255,255,255,0.2)); }
.f-box h3 { font-size: 18px; font-weight: 600; color: var(--text-white); margin-bottom: 10px; letter-spacing: 1px; }
.f-box p { font-size: 14px; color: var(--text-gray); }

/* 功能详情 - 发布会PPT式排版 */
.detail-item { display: flex; align-items: center; gap: 80px; margin-bottom: 120px; }
.detail-item:nth-child(even) { flex-direction: row-reverse; }
.d-text { flex: 1; }
.d-text h3 { font-size: 40px; font-weight: 700; margin-bottom: 24px; line-height: 1.2; letter-spacing: -1px; }
.d-text p { font-size: 18px; color: var(--text-gray); margin-bottom: 40px; line-height: 1.8; }
.d-data { display: inline-block; font-size: 32px; font-weight: 800; color: var(--accent-cyan); }
.d-data span { font-size: 14px; color: var(--text-gray); display: block; font-weight: 400; text-transform: uppercase; letter-spacing: 1px; margin-top: 5px; }
.d-visual { flex: 1; position: relative; }
.d-visual img { border-radius: 24px; box-shadow: 0 20px 50px rgba(0,0,0,0.5); border: 1px solid var(--border-dark); }
.d-visual::after { content: ''; position: absolute; inset: -20px; background: radial-gradient(circle, var(--stage-glow) 0%, transparent 70%); z-index: -1; }

/* 浏览器对比 */
.compare-box { background: var(--bg-surface); border: 1px solid var(--border-dark); border-radius: 24px; padding: 40px; overflow: hidden; }
.compare-table { width: 100%; border-collapse: collapse; text-align: left; }
.compare-table th, .compare-table td { padding: 24px; border-bottom: 1px solid rgba(255,255,255,0.05); }
.compare-table th { font-weight: 600; color: var(--text-gray); text-transform: uppercase; font-size: 14px; letter-spacing: 1px; }
.compare-table td { font-weight: 500; font-size: 16px; }
.compare-table .hl { color: var(--text-white); font-weight: 700; background: rgba(0, 229, 255, 0.05); border-radius: 8px; border-left: 2px solid var(--accent-cyan); }
.compare-table tr:last-child td { border-bottom: none; }

/* 数据背书 - 巨幕数字 */
.data-sec { padding: 120px 0; margin: 40px 0; text-align: center; position: relative; border-top: 1px solid var(--border-dark); border-bottom: 1px solid var(--border-dark); background: linear-gradient(90deg, rgba(0,0,0,0) 0%, rgba(255,255,255,0.02) 50%, rgba(0,0,0,0) 100%); }
.data-inner { max-width: 1000px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; }
.data-item h4 { font-size: 80px; font-weight: 800; letter-spacing: -2px; margin-bottom: 10px; background: linear-gradient(180deg, #FFFFFF 0%, #555 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.data-item p { font-size: 18px; color: var(--text-gray); font-weight: 500; letter-spacing: 2px; text-transform: uppercase; }
.data-icon { width: 100px; height: 100px; padding: 20px; border-radius: 50%; background: rgba(255,255,255,0.03); border: 1px solid var(--border-dark); }

/* 下载版本区 */
.dl-wrap { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.dl-card { padding: 48px 32px; background: var(--bg-surface); border: 1px solid var(--border-dark); border-radius: 24px; text-align: center; transition: 0.4s; }
.dl-card:hover { transform: translateY(-10px); border-color: rgba(255,255,255,0.4); box-shadow: 0 20px 40px rgba(0,0,0,0.5); }
.dl-card h3 { font-size: 28px; font-weight: 700; color: var(--text-white); margin-bottom: 16px; }
.dl-card p { font-size: 15px; color: var(--text-gray); margin-bottom: 40px; line-height: 1.6; height: 48px; }
.dl-card .btn { width: 100%; }
.dl-card.pro { background: linear-gradient(180deg, rgba(0, 122, 255, 0.1) 0%, var(--bg-surface) 100%); border-color: rgba(0, 229, 255, 0.3); }

/* FAQ */
.faq-wrap { max-width: 900px; margin: 0 auto; }
.faq-item { padding: 32px 0; border-bottom: 1px solid var(--border-dark); }
.faq-item h4 { font-size: 20px; font-weight: 600; color: var(--text-white); margin-bottom: 16px; }
.faq-item p { font-size: 16px; color: var(--text-gray); line-height: 1.8; }

/* Footer */
.footer { padding: 60px 20px; text-align: center; border-top: 1px solid var(--border-dark); color: var(--text-gray); font-size: 14px; margin-top: 80px; }