:root {
    --ver-primary: #0055FF; /* 极速蓝 */
    --ver-accent: #FF5500; /* 升级橙 */
    --bg-light: #F4F7FB;
    --bg-white: #FFFFFF;
    --text-dark: #111827;
    --text-gray: #4B5563;
    --border-color: #E5E7EB;
    --shadow-sm: 0 4px 12px rgba(0, 85, 255, 0.08);
    --shadow-lg: 0 16px 40px rgba(0, 85, 255, 0.15);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: "PingFang SC", "Microsoft YaHei", sans-serif; background-color: var(--bg-light); color: var(--text-dark); line-height: 1.6; }
a { text-decoration: none; color: inherit; transition: 0.3s; }
img { max-width: 100%; border-radius: 8px; }
ul { list-style: none; }

/* 升级标签 */
.tag-new { background: linear-gradient(90deg, #FF3300, #FF7700); color: #FFF; font-size: 12px; padding: 2px 8px; border-radius: 12px 12px 12px 0; font-weight: bold; margin-left: 6px; display: inline-block; vertical-align: middle; text-transform: uppercase; letter-spacing: 1px; animation: pulse 2s infinite; }
.tag-up { color: var(--ver-accent); font-weight: 800; font-style: italic; }

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

/* 导航 */
.header { background: var(--bg-white); border-bottom: 1px solid var(--border-color); position: sticky; top: 0; z-index: 1000; box-shadow: var(--shadow-sm); }
.nav-wrap { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; height: 72px; padding: 0 20px; }
.logo { font-size: 24px; font-weight: 900; color: var(--text-dark); display: flex; align-items: center; gap: 10px; font-style: italic; }
.logo img { width: 36px; height: 36px; }
.logo span { color: var(--ver-primary); }
.nav-links { display: flex; gap: 32px; }
.nav-links a { font-size: 16px; font-weight: 600; color: var(--text-gray); }
.nav-links a:hover, .nav-links a.active { color: var(--ver-primary); }

.container { max-width: 1200px; margin: 0 auto; padding: 60px 20px; }

/* 速度感按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 14px 36px; border-radius: 4px; font-size: 18px; font-weight: 800; cursor: pointer; transition: 0.3s; transform: skewX(-5deg); }
.btn-inner { transform: skewX(5deg); display: flex; align-items: center; gap: 8px; }
.btn-primary { background: linear-gradient(90deg, #0055FF, #0088FF); color: #FFF; box-shadow: 0 8px 20px rgba(0, 85, 255, 0.4); border: none; }
.btn-primary:hover { background: linear-gradient(90deg, #0044CC, #0066FF); box-shadow: 0 10px 25px rgba(0, 85, 255, 0.5); transform: skewX(-5deg) translateY(-2px); }
.btn-outline { background: var(--bg-white); color: var(--ver-primary); border: 2px solid var(--ver-primary); }
.btn-outline:hover { background: #F0F6FF; transform: skewX(-5deg) translateY(-2px); }
.btn-accent { background: linear-gradient(90deg, #FF5500, #FF2200); color: #FFF; box-shadow: 0 8px 20px rgba(255, 85, 0, 0.4); border: none; }
.btn-accent:hover { background: linear-gradient(90deg, #CC4400, #CC1100); transform: skewX(-5deg) translateY(-2px); }

/* 首屏版本升级风 */
.hero { background: var(--bg-white); position: relative; overflow: hidden; padding: 80px 20px 100px; border-bottom: 1px solid var(--border-color); }
.hero-watermark { position: absolute; top: -50px; right: -50px; font-size: 300px; font-weight: 900; color: rgba(0, 85, 255, 0.03); z-index: 0; font-style: italic; pointer-events: none; }
.hero-wrap { max-width: 1200px; margin: 0 auto; display: flex; align-items: center; gap: 60px; position: relative; z-index: 1; }
.hero-content { flex: 1; }
.hero-version { display: inline-block; background: rgba(0, 85, 255, 0.1); color: var(--ver-primary); font-size: 18px; font-weight: 900; padding: 4px 16px; border-radius: 4px; margin-bottom: 20px; font-style: italic; border-left: 4px solid var(--ver-primary); }
.hero-content h1 { font-size: 56px; font-weight: 900; line-height: 1.1; margin-bottom: 15px; letter-spacing: -1px; }
.hero-content .subtitle { font-size: 26px; font-weight: 800; color: var(--ver-accent); margin-bottom: 25px; font-style: italic; }
.hero-content .desc { font-size: 16px; color: var(--text-gray); margin-bottom: 40px; }
.hero-btns { display: flex; gap: 20px; }
.hero-visual { flex: 1.2; position: relative; }
.hero-visual img { border-radius: 12px; box-shadow: var(--shadow-lg); border: 1px solid var(--border-color); transform: perspective(1000px) rotateY(-5deg); transition: 0.5s; }
.hero-visual:hover img { transform: perspective(1000px) rotateY(0deg); }
.hero-visual::before { content: 'V15.0 SPEED'; position: absolute; bottom: -20px; right: -20px; font-size: 60px; font-weight: 900; color: var(--ver-accent); opacity: 0.2; font-style: italic; z-index: -1; }

/* 模块标题 */
.sec-title { text-align: center; font-size: 36px; font-weight: 900; margin-bottom: 50px; font-style: italic; letter-spacing: 1px; text-transform: uppercase; }
.sec-title span { color: var(--ver-primary); }

/* 核心卖点 (升级参数风) */
.feature-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.f-box { background: var(--bg-white); border: 1px solid var(--border-color); padding: 30px 15px; border-radius: 8px; text-align: center; box-shadow: var(--shadow-sm); transition: 0.3s; position: relative; overflow: hidden; }
.f-box::before { content: ''; position: absolute; top: 0; left: 0; width: 4px; height: 100%; background: var(--ver-primary); }
.f-box:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); border-color: rgba(0,85,255,0.3); }
.f-box img { width: 52px; height: 52px; margin-bottom: 15px; }
.f-box h3 { font-size: 16px; font-weight: 800; margin-bottom: 8px; }
.f-box p { font-size: 13px; color: var(--text-gray); }

/* 功能详情 */
.detail-box { display: flex; align-items: center; gap: 50px; background: var(--bg-white); padding: 50px; border-radius: 12px; margin-bottom: 40px; box-shadow: var(--shadow-sm); border: 1px solid var(--border-color); }
.detail-box:nth-child(odd) { flex-direction: row-reverse; }
.d-text { flex: 1; }
.d-text h3 { font-size: 28px; font-weight: 900; margin-bottom: 20px; font-style: italic; }
.d-text p { font-size: 16px; color: var(--text-gray); margin-bottom: 24px; line-height: 1.8; }
.d-data { display: inline-flex; align-items: center; gap: 10px; font-size: 20px; font-weight: 900; color: var(--ver-accent); font-style: italic; background: #FFF0E5; padding: 8px 16px; border-radius: 4px; border-left: 4px solid var(--ver-accent); }
.d-visual { flex: 1.2; position: relative; }
.d-visual img { border-radius: 8px; border: 1px solid var(--border-color); box-shadow: var(--shadow-sm); }
.d-visual::after { content: ''; position: absolute; top: -10px; right: -10px; bottom: 10px; left: 10px; border: 2px dashed rgba(0,85,255,0.2); z-index: -1; border-radius: 8px; }

/* 竞品对比 (参数跑分风) */
.compare-box { background: var(--bg-white); border-radius: 12px; box-shadow: var(--shadow-sm); padding: 30px; border: 1px solid var(--border-color); }
.compare-table { width: 100%; border-collapse: collapse; text-align: left; }
.compare-table th, .compare-table td { padding: 20px 24px; border-bottom: 1px solid var(--border-color); }
.compare-table th { background: #F9FAFB; font-weight: 800; color: var(--text-gray); font-size: 15px; text-transform: uppercase; }
.compare-table .hl { background: #F0F6FF; color: var(--ver-primary); font-weight: 900; border-left: 3px solid var(--ver-primary); border-right: 3px solid var(--ver-primary); font-size: 16px; }
.compare-table tr:last-child td { border-bottom: none; }

/* 下载版本区 */
.version-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.v-card { background: var(--bg-white); padding: 50px 30px; border-radius: 8px; text-align: center; border: 1px solid var(--border-color); box-shadow: var(--shadow-sm); transition: 0.3s; position: relative; }
.v-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.v-card.extreme { border: 2px solid var(--ver-accent); box-shadow: 0 10px 30px rgba(255,85,0,0.15); transform: scale(1.05); z-index: 2; }
.v-card.extreme:hover { transform: scale(1.05) translateY(-5px); }
.v-card.extreme::before { content: '主推版本 v15.0'; position: absolute; top: -14px; left: 50%; transform: translateX(-50%); background: var(--ver-accent); color: #fff; padding: 4px 16px; border-radius: 20px; font-weight: 900; font-size: 13px; font-style: italic; }
.v-card h3 { font-size: 24px; font-weight: 900; margin-bottom: 15px; }
.v-card p { font-size: 14px; color: var(--text-gray); margin-bottom: 30px; height: 45px; }
.v-card .btn { width: 100%; }

/* 数据跑分背书 */
.data-sec { display: flex; justify-content: space-around; background: var(--text-dark); color: #fff; padding: 60px 40px; border-radius: 12px; margin: 80px 0; background-image: linear-gradient(135deg, #111827 0%, #1F2937 100%); position: relative; overflow: hidden; }
.data-sec::before { content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: repeating-linear-gradient(45deg, transparent, transparent 10px, rgba(255,255,255,0.02) 10px, rgba(255,255,255,0.02) 20px); pointer-events: none; }
.data-item { text-align: center; position: relative; z-index: 1; }
.data-item h4 { font-size: 52px; font-weight: 900; color: var(--ver-primary); margin-bottom: 5px; font-style: italic; text-shadow: 0 4px 10px rgba(0,85,255,0.3); }
.data-item p { font-size: 16px; font-weight: 600; color: #9CA3AF; letter-spacing: 1px; }

/* FAQ */
.faq-wrap { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
.faq-box { background: var(--bg-white); border: 1px solid var(--border-color); padding: 25px 30px; border-radius: 8px; transition: 0.3s; border-left: 4px solid var(--text-gray); }
.faq-box:hover { border-left-color: var(--ver-primary); box-shadow: var(--shadow-sm); }
.faq-box h4 { font-size: 18px; font-weight: 800; color: var(--text-dark); margin-bottom: 12px; display: flex; align-items: center; gap: 10px; }
.faq-box h4::before { content: 'Q:'; color: var(--ver-primary); font-size: 20px; font-style: italic; }
.faq-box p { font-size: 15px; color: var(--text-gray); line-height: 1.6; }

/* Footer */
.footer { background: #E5E7EB; text-align: center; padding: 40px; color: var(--text-gray); font-size: 14px; margin-top: 60px; font-weight: 600; }