/* ==========================================================================
   wind.css — 你若成风科技官网 · 「风」设计系统
   概念：以品牌名"风"为核心 —— 流场动画、空气感排版、风痕渐变。
   自包含，无外部依赖（系统字体 / 纯 CSS 图形）。
   末尾保留产品详情页的原版浅色样式 (.pd-* + body.pd-page)。
   ========================================================================== */
:root{
  --ink:#06080f; --ink-2:#0a0e1a; --panel:rgba(255,255,255,.028);
  --line:rgba(148,163,184,.14); --line-2:rgba(148,163,184,.28);
  --text:#eef2f8; --muted:#8b96ad; --dim:#5b6478;
  --teal:#5eead4; --sky:#7dd3fc; --peri:#a5b4fc;
  --wind:linear-gradient(100deg,#5eead4 0%,#7dd3fc 48%,#a5b4fc 100%);
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --mono:"SF Mono",ui-monospace,"Cascadia Mono",Menlo,Consolas,monospace;
  --wrap:1180px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;overflow-x:hidden}
body{margin:0;background:var(--ink);color:var(--text);font-family:var(--sans);line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0}
::selection{background:rgba(94,234,212,.28);color:#fff}
.wrap,.wd-container{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 28px}
.mono{font-family:var(--mono);font-size:12px;letter-spacing:.24em;text-transform:uppercase;color:var(--teal)}
.grad{background:var(--wind);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent}

/* ---------- nav (fixed, transparent → scrolled) ---------- */
.nav{position:fixed;inset:0 0 auto 0;z-index:50;transition:background .3s,border-color .3s}
.nav.scrolled{background:rgba(6,8,15,.72);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav__in{display:flex;align-items:center;justify-content:space-between;height:76px}
.brand{display:flex;align-items:center;gap:12px;font-size:16px;letter-spacing:.06em;font-weight:500;color:#fff}
.brand__gust{width:26px;height:26px;flex:none;position:relative}
.brand__gust::before,.brand__gust::after{content:"";position:absolute;left:0;height:2px;border-radius:2px;background:var(--wind)}
.brand__gust::before{top:8px;width:26px}
.brand__gust::after{top:15px;width:17px;opacity:.7}
.nav__links{display:flex;gap:34px;align-items:center;list-style:none;margin:0;padding:0}
.nav__links a{font-size:14px;color:var(--muted);letter-spacing:.04em;transition:color .2s}
.nav__links a:hover,.nav__links a.active{color:var(--text)}
.nav__toggle{display:none;background:none;border:0;color:#fff;cursor:pointer;padding:6px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:10px;padding:14px 30px;border-radius:2px;font-size:15px;letter-spacing:.04em;transition:.25s;cursor:pointer;border:1px solid transparent}
.btn--fill{background:var(--wind);color:#05121a;font-weight:600}
.btn--fill:hover{transform:translateY(-2px);box-shadow:0 14px 40px rgba(94,234,212,.28)}
.btn--line{border-color:var(--line-2);color:var(--text)}
.btn--line:hover{border-color:var(--teal);color:var(--teal)}
.btn .ar{transition:transform .25s}
.btn:hover .ar{transform:translateX(5px)}

/* ---------- hero ---------- */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;overflow:hidden}
#windfield{position:absolute;inset:0;z-index:0;width:100%;height:100%;display:block}
.hero::after{content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background:radial-gradient(120% 90% at 78% 12%,transparent 40%,rgba(6,8,15,.55) 100%),linear-gradient(180deg,rgba(6,8,15,.5),transparent 30%,transparent 70%,var(--ink))}
.hero__in{position:relative;z-index:2;width:100%;padding:120px 0 90px}
.hero__eyebrow{display:flex;gap:16px;align-items:center;margin-bottom:34px}
.hero__eyebrow span{height:1px;width:64px;background:var(--line-2)}
.hero__title{font-weight:200;letter-spacing:.14em;line-height:.98;margin:0;font-size:clamp(64px,15vw,190px);text-indent:-.06em}
.hero__title b{font-weight:600}
.hero__sub{max-width:520px;margin:30px 0 0;color:var(--muted);font-size:clamp(16px,1.7vw,20px);line-height:1.9;font-weight:300}
.hero__cta{display:flex;gap:18px;flex-wrap:wrap;margin-top:44px}
.hero__readout{position:absolute;bottom:96px;z-index:2;text-align:right;font-family:var(--mono);color:var(--dim);font-size:12px;letter-spacing:.16em;line-height:2.1;right:max(28px,calc(50vw - var(--wrap)/2 + 28px))}
.hero__readout b{color:var(--teal);font-weight:500}
.scrollcue{position:absolute;left:28px;bottom:40px;z-index:2;font-family:var(--mono);font-size:11px;letter-spacing:.3em;color:var(--dim);writing-mode:vertical-rl;display:flex;align-items:center;gap:14px}
.scrollcue::after{content:"";width:1px;height:60px;background:linear-gradient(var(--line-2),transparent);animation:drop 2.4s infinite}
@keyframes drop{0%{opacity:0;transform:scaleY(0);transform-origin:top}40%{opacity:1;transform:scaleY(1);transform-origin:top}100%{opacity:0;transform:scaleY(1);transform-origin:bottom}}

/* ---------- section shell ---------- */
.sec{position:relative;padding:130px 0}
.sec__tag{display:flex;align-items:center;gap:16px;margin-bottom:40px}
.sec__tag span{height:1px;flex:1;max-width:120px;background:var(--line)}

/* page header (product / contact) */
.pagehead{position:relative;padding:150px 0 40px;text-align:center;overflow:hidden}
.pagehead::after{content:"";position:absolute;width:520px;height:520px;border-radius:50%;top:-220px;left:50%;transform:translateX(-50%);z-index:-1;
  background:radial-gradient(circle,rgba(94,234,212,.14),transparent 65%)}
.pagehead h1{font-weight:200;letter-spacing:.06em;font-size:clamp(36px,6vw,64px);margin:14px 0 18px}
.pagehead p{color:var(--muted);font-weight:300;font-size:clamp(15px,1.6vw,18px);max-width:600px;margin:0 auto;line-height:1.9}

/* ---------- about ---------- */
.about{display:grid;grid-template-columns:1.55fr .85fr;gap:70px;align-items:end}
.about__lead{font-size:clamp(26px,3.4vw,42px);font-weight:200;line-height:1.4;letter-spacing:.01em;margin:0 0 34px}
.about__lead em{font-style:normal;font-weight:500}
.about__body{color:var(--muted);font-size:16.5px;line-height:2;font-weight:300;max-width:640px;margin:0}
.about__meta{border-left:1px solid var(--line);padding-left:28px;display:flex;flex-direction:column;gap:26px}
.about__meta .k{font-family:var(--mono);font-size:11px;letter-spacing:.2em;color:var(--dim);text-transform:uppercase}
.about__meta .v{font-size:30px;font-weight:200;margin-top:6px;letter-spacing:.02em}

/* ---------- capabilities (a current) ---------- */
.flowline{position:relative;margin-top:16px}
.flowline::before{content:"";position:absolute;top:9px;left:2%;right:2%;height:1px;background:linear-gradient(90deg,transparent,var(--line-2) 12%,var(--line-2) 88%,transparent)}
.caps{display:grid;grid-template-columns:repeat(3,1fr);gap:48px;position:relative}
.cap__node{width:18px;height:18px;border-radius:50%;background:var(--ink);border:1px solid var(--line-2);position:relative;margin-bottom:34px}
.cap__node::after{content:"";position:absolute;inset:4px;border-radius:50%;background:var(--wind)}
.cap h3{font-size:22px;font-weight:500;margin:0 0 14px;letter-spacing:.02em}
.cap p{color:var(--muted);font-size:15px;line-height:1.9;font-weight:300;margin:0;max-width:300px}
.cap .idx{font-family:var(--mono);font-size:12px;color:var(--dim);letter-spacing:.16em;margin-bottom:20px;display:block}

/* ---------- products: drifting river ---------- */
.prod-head{display:flex;justify-content:space-between;align-items:flex-end;flex-wrap:wrap;gap:20px;margin-bottom:8px}
.prod-head h2{font-size:clamp(30px,4.4vw,54px);font-weight:200;letter-spacing:.03em;margin:.2em 0 0}
.river{position:relative;overflow:hidden;padding:14px 0;-webkit-mask-image:linear-gradient(90deg,transparent,#000 7%,#000 93%,transparent);mask-image:linear-gradient(90deg,transparent,#000 7%,#000 93%,transparent)}
.river__track{display:flex;gap:20px;width:max-content;animation:drift 46s linear infinite}
.river:hover .river__track{animation-play-state:paused}
.river--rev .river__track{animation-duration:54s;animation-direction:reverse}
@keyframes drift{to{transform:translateX(-50%)}}
.pcard{display:flex;align-items:center;gap:16px;padding:16px 22px 16px 16px;border:1px solid var(--line);border-radius:14px;background:var(--panel);min-width:250px;transition:.3s}
.pcard:hover{border-color:var(--line-2);background:rgba(255,255,255,.05);transform:translateY(-4px)}
.pcard img{width:52px;height:52px;border-radius:13px;flex:none;background:#0e1524}
.pcard .nm{font-size:15px;font-weight:500;letter-spacing:.02em}
.pcard .ds{font-size:12.5px;color:var(--dim);margin-top:3px}
.prod-cta{margin-top:52px;text-align:center}

/* ---------- product grid (full listing) ---------- */
.appgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.acard{display:flex;flex-direction:column;align-items:center;text-align:center;padding:32px 20px;border:1px solid var(--line);border-radius:16px;background:var(--panel);transition:.3s}
.acard:hover{border-color:var(--line-2);background:rgba(255,255,255,.05);transform:translateY(-5px);box-shadow:0 20px 50px rgba(0,0,0,.4)}
.acard img{width:70px;height:70px;border-radius:17px;margin-bottom:16px;background:#0e1524;box-shadow:0 8px 22px rgba(0,0,0,.4)}
.acard h3{font-size:16px;font-weight:500;margin:0 0 8px;letter-spacing:.02em}
.acard p{font-size:12.5px;color:var(--muted);line-height:1.7;margin:0;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* ---------- contact ---------- */
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;max-width:900px;margin:0 auto}
.citem{display:flex;align-items:center;gap:20px;padding:28px 30px;border:1px solid var(--line);border-radius:16px;background:var(--panel);transition:.3s}
.citem:hover{border-color:var(--line-2);background:rgba(255,255,255,.05)}
.citem__ic{width:52px;height:52px;flex:none;border-radius:13px;display:flex;align-items:center;justify-content:center;background:rgba(94,234,212,.1);border:1px solid var(--line);color:var(--teal)}
.citem__ic svg{width:26px;height:26px}
.citem .k{font-family:var(--mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--dim)}
.citem .v{font-size:17px;font-weight:500;margin-top:5px}

/* ---------- footer ---------- */
.foot{border-top:1px solid var(--line);padding:56px 0 40px;margin-top:40px}
.foot__in{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap;align-items:center}
.foot__links{display:flex;gap:28px;flex-wrap:wrap}
.foot__links a{color:var(--muted);font-size:14px;transition:color .2s}
.foot__links a:hover{color:var(--teal)}
.foot__copy{color:var(--dim);font-size:12.5px;line-height:2;margin-top:26px;font-family:var(--mono);letter-spacing:.04em}
.foot__copy a{color:var(--dim)}
.foot__copy a:hover{color:var(--muted)}

/* ---------- reveal (scroll-based; no-JS shows content) ---------- */
html.js .rv{opacity:0;transform:translateY(26px);transition:opacity .9s cubic-bezier(.2,.7,.2,1),transform .9s cubic-bezier(.2,.7,.2,1)}
html.js .rv.in{opacity:1;transform:none}
html.js .rv-l{opacity:0;transform:translateX(-40px);transition:opacity 1s cubic-bezier(.2,.7,.2,1),transform 1s cubic-bezier(.2,.7,.2,1)}
html.js .rv-l.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  html.js .rv,html.js .rv-l{opacity:1;transform:none;transition:none}
  .river__track{animation:none;flex-wrap:wrap;justify-content:center}
  .scrollcue::after{animation:none}
}

/* ---------- responsive ---------- */
@media(max-width:960px){
  .appgrid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:900px){
  .about{grid-template-columns:1fr;gap:40px}
  .about__meta{flex-direction:row;flex-wrap:wrap;gap:30px;border-left:0;border-top:1px solid var(--line);padding:28px 0 0}
  .caps{grid-template-columns:1fr;gap:40px}
  .flowline::before{display:none}
  .hero__readout{display:none}
  .contact-grid{grid-template-columns:1fr}
}
@media(max-width:640px){
  .nav__links{position:fixed;inset:76px 0 auto 0;flex-direction:column;gap:0;background:rgba(8,11,20,.97);backdrop-filter:blur(14px);border-bottom:1px solid var(--line);padding:10px 28px 22px;transform:translateY(-8px);opacity:0;pointer-events:none;transition:.25s}
  .nav__links.open{transform:none;opacity:1;pointer-events:auto}
  .nav__links a{padding:14px 0;width:100%;border-bottom:1px solid var(--line)}
  .nav__toggle{display:block}
  .sec{padding:88px 0}
  .pagehead{padding:120px 0 30px}
  .appgrid{grid-template-columns:1fr}
  .scrollcue{display:none}
  .btn{flex:1;justify-content:center}
}

/* ==========================================================================
   产品详情页：原版浅色布局（深灰 Hero + 红色下载按钮 + 白底特性区），配新页头页脚。
   <body class="pd-page"> 切换为浅色主题。
   ========================================================================== */
body.pd-page{background:#fff;color:#222}
body.pd-page::selection{background:rgba(255,80,80,.2);color:#222}
/* 原版正文靠"内联图片 + text-align"居中/对齐；wind.css 基础的 img{display:block} 会破坏它，详情页改回 inline-block */
body.pd-page img{display:inline-block;vertical-align:middle;max-width:100%}
body.pd-page .container{margin-left:auto;margin-right:auto}
/* 特性区：还原左右并排布局，图片在各自半区居中，收敛原版过大的 margin:30% 让图文对齐 */
body.pd-page .headings{display:flex;align-items:center;justify-content:center;gap:48px;max-width:1040px;margin:0 auto}
body.pd-page .headings>div{flex:1;padding:0!important;text-align:left}
body.pd-page .headings>div img{display:block;margin:0 auto}
body.pd-page .headings [style*="30%"]{margin:0!important}
/* 装饰性粉色圆(.class-style)是绝对定位元素，默认会盖在图片上——压到最底层，只当背景 */
body.pd-page .headings{position:relative}
body.pd-page .headings>div:not(.class-style){position:relative;z-index:1}
body.pd-page .class-style{z-index:0}
@media(max-width:820px){body.pd-page .headings{flex-direction:column;gap:24px}body.pd-page .class-style{display:none}}
.pd-hero{background:#3c3c3c;color:#fff;padding:116px 0 64px}
.pd-hero__inner{display:grid;grid-template-columns:5fr 6fr;gap:48px;align-items:center}
.pd-hero__logo{width:120px;height:120px;border-radius:26px;margin-bottom:22px;box-shadow:0 8px 24px rgba(0,0,0,.35)}
.pd-hero__name{font-size:28px;font-weight:700;margin:0 0 16px}
.pd-hero__desc{font-size:20px;line-height:1.9;margin:0 0 30px;opacity:.9}
.pd-hero__shot{max-height:520px;width:auto;margin:0 auto;border-radius:14px}
.pd-btn{display:inline-block;background:#ff5050;color:#fff;font-size:20px;font-weight:500;line-height:50px;height:50px;padding:0 56px;border-radius:40px;border:0;cursor:pointer;transition:background .2s}
.pd-btn:hover{background:#ff6a6a;color:#fff}
.pd-btn--muted{background:#8a8a8a;cursor:default}
.pd-btn--muted:hover{background:#8a8a8a}
.pd-features{padding:80px 0}
.pd-row{display:flex;align-items:center;gap:60px;max-width:1040px;margin:0 auto 76px}
.pd-row:last-child{margin-bottom:0}
.pd-row:nth-child(even){flex-direction:row-reverse}
.pd-row__img{flex:1;min-width:0}
.pd-row__img img{width:100%;border-radius:12px;box-shadow:0 10px 30px rgba(0,0,0,.1)}
.pd-row__text{flex:1}
.pd-row__bar{width:130px;height:9px;border-radius:2px;margin-bottom:20px}
.pd-row__text h3{font-size:24px;color:#222;margin:0 0 14px;font-weight:700}
.pd-row__text p{font-size:16px;color:#555;margin:0;line-height:1.9}
@media(max-width:820px){
  .pd-hero{padding:96px 0 48px}
  .pd-hero__inner{grid-template-columns:1fr;gap:28px;text-align:center}
  .pd-hero__logo{margin-left:auto;margin-right:auto}
  .pd-hero__shot{max-height:400px}
  .pd-row,.pd-row:nth-child(even){flex-direction:column;gap:24px;text-align:center}
  .pd-row__bar{margin-left:auto;margin-right:auto}
  .pd-btn{width:100%;padding:0}
}