/* ============================================================
   Xhealth V2 — 全新设计系统
   字体：Petrona (正文 ExtraLight) + Fraunces (标题)
   布局：垂直瀑布流，独立圆角模块
   ============================================================ */

/* === 字体 === */
@import url('https://fonts.googleapis.com/css2?family=Petrona:wght@200;400&display=swap');

@font-face{font-family:"Petrona";font-style:normal;font-weight:400;font-display:swap;src:url("fonts/petrona-400-normal.woff2") format("woff2")}
@font-face{font-family:"Petrona";font-style:italic;font-weight:200;font-display:swap;src:url("fonts/petrona-200-italic.woff2") format("woff2")}
@font-face{font-family:"Fraunces";font-style:normal;font-weight:200;font-display:swap;src:url("fonts/fraunces-200-normal.ttf") format("truetype")}
@font-face{font-family:"Fraunces";font-style:normal;font-weight:300;font-display:swap;src:url("fonts/fraunces-300-normal.ttf") format("truetype")}
@font-face{font-family:"Fraunces";font-style:normal;font-weight:400;font-display:swap;src:url("fonts/fraunces-400-normal.ttf") format("truetype")}

/* === 设计变量 === */
:root{
    --ink:#0b303b;
    --ink-soft:#1a3a45;
    --bg:#f0f9ff;
    --bg-card:#ffffff;
    --bg-tint:#eaf4f5;
    --bg-warm:#fff4ed;
    --accent:#0693e3;
    --pale:#8ed1fc;
    --purple:#1436ca;
    --radius:20px;
    --radius-sm:12px;
    --shadow:0 4px 24px rgba(11,48,59,0.06);
    --shadow-hover:0 8px 32px rgba(11,48,59,0.12);
    --maxw:1200px;
    --pad:clamp(16px,4vw,40px);
    --font-body:"Petrona",Georgia,serif;
    --font-head:"Fraunces",Georgia,serif;
}

/* === Reset === */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none;transition:color .2s}
a:hover{color:var(--accent)}
ul{list-style:none}

/* === Body === */
body{
    font-family:var(--font-body);
    font-weight:200;
    font-size:clamp(1rem,0.95rem + 0.3vw,1.125rem);
    line-height:1.65;
    color:var(--ink);
    background:linear-gradient(160deg,#eef6fb 0%,#f0f9ff 40%,#eaf4f5 100%);
    background-attachment:fixed;
    -webkit-font-smoothing:antialiased;
    padding-top:68px;
}

/* === 通用容器 === */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 var(--pad)}
.section{padding:clamp(32px,6vw,64px) 0}

/* === 标题 === */
h1,h2,h3,h4,h5{font-family:var(--font-head);font-weight:300;line-height:1.2;letter-spacing:-0.01em}
h2{font-size:clamp(1.5rem,1.2rem + 1.5vw,2.25rem)}
h3{font-size:clamp(1.15rem,1rem + 0.7vw,1.5rem)}
.eyebrow{font-family:var(--font-body);font-size:0.85rem;font-weight:400;letter-spacing:0.12em;text-transform:uppercase;color:var(--accent)}
.center{text-align:center}

/* === 顶部导航 === */
.site-header{
    position:fixed;top:0;left:0;right:0;z-index:1000;
    background:rgba(255,255,255,0.82);
    backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
    border-bottom:1px solid rgba(11,48,59,0.06);
}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:68px;gap:24px}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.brand img{height:40px;width:auto}
.nav{display:flex;align-items:center;gap:clamp(16px,2vw,28px);flex-wrap:wrap;justify-content:flex-end}
.nav a{font-size:1.2rem;font-weight:400;color:var(--ink);white-space:nowrap;position:relative;padding:4px 0}
.nav a:hover,.nav a.active{color:var(--accent)}
.nav a.active::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--accent);border-radius:2px}

/* === Hero === */
.hero{padding:clamp(18px,8vw,28px) 0 clamp(32px,5vw,56px)}
.hero h1{font-size:clamp(1.8rem,1.3rem + 2.8vw,3rem);font-weight:200;text-align:center;max-width:900px;margin:0 auto;line-height:1.15}
.hero .tagline{font-family:var(--font-head);font-weight:300;text-align:center;font-size:clamp(1.05rem,0.95rem + 0.5vw,1.35rem);color:var(--ink-soft);margin-top:14px}
.hero .divider{width:64px;height:3px;background:var(--accent);border-radius:3px;margin:28px auto 0;opacity:.5}

/* === 独立圆角模块（通用卡片） === */
.module{
    background:var(--bg-card);
    border-radius:var(--radius);
    box-shadow:var(--shadow);
    padding:clamp(24px,4vw,44px);
    margin-bottom:clamp(20px,3vw,32px);
}

/* === 模块标题行 === */
.module-head{display:flex;align-items:baseline;gap:12px;margin-bottom:clamp(20px,3vw,32px);flex-wrap:wrap}
.module-head h2{flex:1 1 auto}
.module-head .count{font-size:0.8rem;color:var(--ink-soft);opacity:.7;font-weight:400}

/* === 三卡片网格（About） === */
.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:clamp(16px,2.5vw,28px)}
.feature{
    background:var(--bg-card);
    border-radius:var(--radius);
    padding:clamp(22px,3vw,32px);
    box-shadow:var(--shadow);
    transition:transform .25s,box-shadow .25s;
    border:1px solid rgba(11,48,59,0.04);
}
.feature:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.feature.tint-warm{background:var(--bg-warm)}
.feature.tint-dark{background:var(--purple);color:#fff}
.feature.tint-dark h3,.feature.tint-dark p{color:#fff}
.feature.tint-dark a{color:#fff}
.feature .icon{width:64px;height:64px;object-fit:contain;margin-bottom:18px}
.feature h3{margin-bottom:10px;font-size:1.2rem;font-weight:300}
.feature p{font-size:0.97rem;color:var(--ink);line-height:1.6}
.feature.tint-dark p{color:rgba(255,255,255,0.85)}

/* === Vision / Mission 双列 === */
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(24px,4vw,48px);align-items:center}
.split .media img{width:100%;border-radius:var(--radius-sm);box-shadow:var(--shadow)}
.split .copy h2{margin-bottom:12px}
.split .copy p{color:var(--ink);margin-bottom:14px}
.split .copy .sub-head{font-family:var(--font-head);font-size:1.1rem;color:var(--ink);margin:18px 0 8px;font-weight:300}
.split .copy ul li{padding-left:22px;position:relative;margin-bottom:8px;color:var(--ink-soft)}
.split .copy ul li::before{content:"";position:absolute;left:0;top:0.7em;width:8px;height:8px;border-radius:50%;background:var(--accent)}

/* === 引言区（渐变） === */
.quote-band{
    background:linear-gradient(100deg,#0693e3 0%,#9b51e0 100%);
    border-radius:var(--radius);
    padding:clamp(32px,5vw,56px);
    color:#fff;
    display:grid;grid-template-columns:1fr 1fr;gap:clamp(24px,4vw,48px);align-items:center;
    box-shadow:var(--shadow);
    margin-bottom:clamp(20px,3vw,32px);
}
.quote-band .quote-img{border-radius:var(--radius-sm);width:100%;max-width:420px;justify-self:center}
.quote-band blockquote{font-family:var(--font-head);font-weight:200;font-size:clamp(1.15rem,1rem + 0.8vw,1.6rem);line-height:1.4;margin:0 0 18px}
.quote-band cite{font-style:normal;font-size:0.95rem;opacity:.9;display:block}
.quote-band cite strong{font-weight:400;display:block;font-size:1.05rem}

/* === 产品列表（垂直堆叠） === */
.products{display:flex;flex-direction:column;gap:clamp(20px,3vw,28px)}
.product{
    background:var(--bg-card);
    border-radius:var(--radius);
    box-shadow:var(--shadow);
    padding:clamp(24px,4vw,40px);
    display:grid;grid-template-columns:1.3fr 1fr;gap:clamp(24px,4vw,44px);align-items:center;
    transition:box-shadow .25s;
}
.product:hover{box-shadow:var(--shadow-hover)}
.product:nth-child(even) .product-media{order:-1}
.product.alt-tint{background:var(--bg-tint)}
.product .product-body h3{margin-bottom:8px;font-size:clamp(1.2rem,1.05rem + 0.6vw,1.6rem)}
.product .product-body .sub{font-family:var(--font-head);font-weight:300;color:var(--accent);margin-bottom:12px;font-size:1.02rem}
.product .product-body p{color:var(--ink);margin-bottom:14px;font-size:0.98rem}
.product .product-body .award{font-weight:400;color:var(--ink);font-size:0.95rem;display:block;margin-bottom:18px}
.product .product-media img{width:100%;border-radius:var(--radius-sm);box-shadow:var(--shadow)}

/* === 按钮 === */
.btn{
    display:inline-block;font-family:var(--font-body);font-size:0.95rem;font-weight:400;
    padding:11px 28px;border-radius:999px;cursor:pointer;border:2px solid var(--ink);
    background:var(--ink);color:#fff;transition:all .2s;letter-spacing:0.02em;
    line-height:1.4;text-align:center;
}
.btn:hover{background:var(--accent);border-color:var(--accent);color:#fff;transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.btn.ghost{background:transparent;color:var(--ink)}
.btn.ghost:hover{background:var(--ink);color:#fff;border-color:var(--ink);transform:translateY(-1px)}
.btn-row{display:flex;justify-content:center;flex-wrap:wrap;gap:14px;margin-top:clamp(28px,4vw,44px)}

/* === 横幅图 === */
.banner{width:100%;border-radius:var(--radius-sm);margin:8px 0}

/* === Footer === */
.site-footer{background:var(--bg-card);border-top:1px solid rgba(11,48,59,0.06);margin-top:40px}
.site-footer .wrap{padding-top:48px;padding-bottom:32px}
.footer-top{display:flex;justify-content:space-between;gap:32px;flex-wrap:wrap;padding-bottom:32px;border-bottom:1px solid rgba(11,48,59,0.08)}
.footer-cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:32px;flex:1}
.footer-col h4{font-family:var(--font-body);font-size:0.95rem;font-weight:400;margin-bottom:12px;color:var(--ink)}
.footer-col a{display:block;font-size:0.9rem;color:var(--ink-soft);padding:3px 0}
.footer-col a:hover{color:var(--accent)}
.social{display:flex;gap:12px;align-items:flex-start}
.social a{width:38px;height:38px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:var(--bg-tint);color:var(--ink);transition:all .2s}
.social a:hover{background:var(--accent);color:#fff;transform:translateY(-2px)}
.social svg{width:18px;height:18px}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;padding-top:24px;font-size:0.8rem;color:var(--ink-soft);opacity:.8}
.footer-bottom a:hover{color:var(--accent)}

/* === 新闻文章卡片 === */
.news-list{display:flex;flex-direction:column;gap:clamp(20px,3vw,32px)}
.news-card{
    background:var(--bg-card);border-radius:var(--radius);box-shadow:var(--shadow);
    padding:clamp(24px,4vw,40px);transition:box-shadow .25s;
}
.news-card:hover{box-shadow:var(--shadow-hover)}
.news-card .news-meta{font-size:0.82rem;color:var(--accent);letter-spacing:0.08em;text-transform:uppercase;margin-bottom:10px}
.news-card h3{font-size:clamp(1.2rem,1.05rem + 0.6vw,1.55rem);margin-bottom:14px;line-height:1.25}
.news-card p{color:var(--ink);margin-bottom:14px;font-size:0.97rem}
.news-card .news-img{width:100%;border-radius:var(--radius-sm);margin:0 0 18px;box-shadow:var(--shadow)}
.news-card .read-more{display:inline-block;font-size:0.9rem;font-weight:400;color:var(--accent);margin-top:6px}
.news-card .read-more::after{content:" →";transition:margin .2s}
.news-card .read-more:hover::after{margin-left:4px}
.news-card h4{font-family:var(--font-head);font-weight:300;font-size:1.1rem;margin:18px 0 10px;color:var(--ink)}

/* === 技术特性列表（Innovations）=== */
.tech-list{display:grid;grid-template-columns:1fr;gap:14px;margin:20px 0 28px}
.tech-list li{padding:16px 20px;background:var(--bg-tint);border-radius:var(--radius-sm);border-left:3px solid var(--accent);color:var(--ink);font-size:0.97rem;line-height:1.55}
.tech-list li strong{color:var(--ink);font-weight:400}
.research-block{margin-top:clamp(24px,4vw,40px)}
.research-block h3{margin-bottom:14px}
.research-block .key-points{background:var(--bg-tint);border-radius:var(--radius-sm);padding:clamp(20px,3vw,28px);margin:18px 0}
.research-block .key-points p{margin-bottom:12px;color:var(--ink)}
.research-block .key-points p:last-child{margin-bottom:0}
.research-block .key-points strong{color:var(--ink);font-weight:400}

/* === 联系表单 === */
.contact-form{max-width:640px;margin:0 auto}
.contact-form .field{margin-bottom:22px}
.contact-form label{display:block;font-size:0.88rem;font-weight:400;color:var(--ink);margin-bottom:6px;letter-spacing:0.02em}
.contact-form label .req{color:var(--accent)}
.contact-form input,.contact-form textarea{
    width:100%;padding:12px 16px;border:1.5px solid rgba(11,48,59,0.12);
    border-radius:var(--radius-sm);font-family:var(--font-body);font-size:1rem;
    font-weight:200;color:var(--ink);background:#fff;transition:border-color .2s;
}
.contact-form input:focus,.contact-form textarea:focus{outline:none;border-color:var(--accent)}
.contact-form textarea{min-height:160px;resize:vertical}
.contact-form .btn{width:100%;text-align:center;margin-top:6px}
.contact-img{width:60%;border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:50px}

/* === 长文段落（Global Network）=== */
.article-body{max-width:760px;margin:0 auto}
.article-body p{color:var(--ink);margin-bottom:18px;font-size:1rem;line-height:1.75}
.article-body p:first-of-type{font-size:1.08rem;color:var(--ink)}
.article-body .lead{font-family:var(--font-head);font-weight:300;font-size:1.2rem;color:var(--ink);margin-bottom:24px}

/* === 响应式 === */
@media (max-width:880px){
    .split{grid-template-columns:1fr}
    .split .media{order:-1}
    .quote-band{grid-template-columns:1fr}
    .quote-band .quote-img{order:-1}
    .product{grid-template-columns:1fr}
    .product:nth-child(even) .product-media{order:0}
    .product .product-media{margin-bottom:8px}
    .nav{gap:12px}
    .site-header .wrap{height:60px}
    body{padding-top:60px}
}
@media (max-width:560px){
    .nav{display:none}
    .nav.open{display:flex;position:absolute;top:100%;left:0;right:0;flex-direction:column;background:rgba(255,255,255,0.96);padding:16px var(--pad);gap:14px;border-bottom:1px solid rgba(11,48,59,0.08)}
    .menu-toggle{display:flex}
    .footer-top{flex-direction:column}
}
.menu-toggle{display:none;flex-direction:column;gap:4px;background:none;border:0;cursor:pointer;padding:6px}
.menu-toggle span{width:22px;height:2px;background:var(--ink);border-radius:2px}