/* 全站共用样式。设计参考：awesome-design-md 中的 Apple DESIGN.md */
:root{
    --ink:#1d1d1f;--muted:#6e6e73;--parchment:#f5f5f7;--white:#fff;--black:#000;
    --tile-dark:#1d1d1f;--line:#d2d2d7;--line-dark:#3a3a3c;
    --blue:#0071e3;--blue-hover:#0077ed;--link:#0066cc;--link-dark:#2997ff;
    --on-dark:#f5f5f7;--on-dark-muted:#a1a1a6;
    --font:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","PingFang SC","HarmonyOS Sans SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",system-ui,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth;}}
body{font-family:var(--font);color:var(--ink);background:var(--white);line-height:1.6;font-size:17px;-webkit-font-smoothing:antialiased;}
a{color:inherit;}
ul,ol{list-style:none;}
h1,h2,h3{text-wrap:balance;font-weight:600;}
section[id]{scroll-margin-top:48px;}
:focus-visible{outline:2px solid var(--blue);outline-offset:3px;border-radius:6px;}
.on-dark :focus-visible{outline-color:var(--link-dark);}
.container{max-width:980px;margin:0 auto;padding:0 24px;}
.skip{position:absolute;left:-9999px;top:8px;background:var(--ink);color:#fff;padding:8px 14px;border-radius:8px;z-index:200;}
.skip:focus{left:8px;}

/* 顶栏 */
header{position:sticky;top:0;z-index:100;height:48px;background:rgba(245,245,247,.82);-webkit-backdrop-filter:saturate(180%) blur(20px);backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid rgba(0,0,0,.08);}
.bar{height:100%;display:flex;align-items:center;justify-content:space-between;gap:24px;}
.brand{display:flex;align-items:center;gap:8px;text-decoration:none;font-weight:600;font-size:17px;letter-spacing:.01em;}
.brand svg{flex:none;}
nav ul{display:flex;gap:28px;}
nav a{text-decoration:none;color:rgba(0,0,0,.8);font-size:13px;transition:color .2s;}
nav a:hover{color:#000;}
nav a[aria-current="page"]{color:#000;font-weight:600;}

/* 通用 */
.btn{display:inline-block;padding:11px 22px;border-radius:980px;font-size:17px;line-height:1.2;text-decoration:none;border:1px solid transparent;cursor:pointer;font-family:inherit;transition:background .2s,color .2s;}
.btn-primary{background:var(--blue);color:#fff;}
.btn-primary:hover{background:var(--blue-hover);}
.btn-secondary{background:transparent;color:var(--link);border-color:var(--link);}
.btn-secondary:hover{background:var(--link);color:#fff;}
.on-dark .btn-secondary{color:var(--link-dark);border-color:var(--link-dark);}
.on-dark .btn-secondary:hover{background:var(--link-dark);color:#000;}
.more{color:var(--link);text-decoration:none;font-size:17px;}
.more:hover{text-decoration:underline;}
.more::after{content:" \203A";}
.on-dark .more{color:var(--link-dark);}
.actions{display:flex;flex-wrap:wrap;gap:14px 20px;justify-content:center;align-items:center;margin-top:32px;}

.block{padding:112px 0;}
.block.parchment{background:var(--parchment);}
.block.dark{background:var(--black);color:var(--on-dark);}
.block.flush-top{padding-top:0;}
.head{text-align:center;max-width:720px;margin:0 auto 64px;}
.head h2{font-size:clamp(30px,4.6vw,48px);line-height:1.12;letter-spacing:-.01em;}
.head p{margin-top:14px;font-size:clamp(17px,2vw,21px);line-height:1.45;color:var(--muted);}
.dark .head p{color:var(--on-dark-muted);}
.note{margin-top:40px;text-align:center;font-size:14px;color:var(--muted);}
.center-link{text-align:center;margin-top:48px;}

/* 首屏与内页页头 */
.hero{background:var(--parchment);text-align:center;padding:88px 0 96px;}
.hero h1{font-size:clamp(34px,6.2vw,64px);line-height:1.1;letter-spacing:-.02em;max-width:14em;margin:0 auto;}
.hero h1 .nb{display:inline-block;}
.hero p.lead{margin:22px auto 0;max-width:34em;font-size:clamp(17px,2.1vw,21px);line-height:1.5;color:var(--muted);}
.page-head{background:var(--parchment);text-align:center;padding:80px 0 72px;}
.page-head h1{font-size:clamp(34px,5.6vw,56px);line-height:1.1;letter-spacing:-.02em;}
.page-head p{margin:18px auto 0;max-width:30em;font-size:clamp(17px,2.1vw,21px);line-height:1.5;color:var(--muted);}

/* 首页链路图 */
.path{background:var(--black);border-radius:28px;max-width:980px;margin:64px auto 0;padding:44px 40px 40px;color:var(--on-dark);text-align:left;}
.path h2{font-size:17px;font-weight:600;color:var(--on-dark);margin-bottom:28px;}
.path svg{display:block;width:100%;height:auto;}
.path .v{display:none;max-width:280px;margin:0 auto;}
.node{fill:var(--tile-dark);stroke:var(--line-dark);stroke-width:1.5;}
.node-t{fill:#f5f5f7;font-size:17px;font-weight:600;font-family:var(--font);}
.node-s{fill:#a1a1a6;font-size:13px;font-family:var(--font);}
.wire{fill:none;stroke:var(--line-dark);stroke-width:2;}
.flow{fill:none;stroke:var(--link-dark);stroke-width:2.5;stroke-dasharray:5 11;stroke-linecap:round;}
@media (prefers-reduced-motion:no-preference){
    .flow{animation:flow 1.6s linear infinite;}
    @keyframes flow{to{stroke-dashoffset:-16;}}
}

/* 服务：首页概览 */
.ov{display:grid;grid-template-columns:repeat(4,1fr);gap:0 32px;}
.ov a{display:block;text-decoration:none;padding:24px 0 28px;border-top:1px solid var(--line);}
.ov h3{font-size:19px;line-height:1.3;}
.ov p{margin-top:8px;font-size:15px;line-height:1.55;color:var(--muted);}

/* 服务：详情页 */
.cap-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 72px;}
.cap{padding:30px 0 34px;border-top:1px solid var(--line);}
.cap h3{font-size:24px;line-height:1.25;letter-spacing:-.005em;}
.cap p{margin-top:10px;font-size:17px;line-height:1.55;color:var(--muted);}
.cap .tech{margin-top:12px;font-size:14px;color:var(--ink);}
.cap .tech b{font-weight:600;}

/* 项目 */
.cases{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
.case{background:var(--white);border-radius:28px;padding:44px 40px 40px;display:flex;flex-direction:column;}
.case.feature{grid-column:1 / -1;background:var(--tile-dark);color:var(--on-dark);}
.case h3{font-size:clamp(24px,2.8vw,32px);line-height:1.15;letter-spacing:-.01em;}
.tags{display:flex;align-items:center;gap:10px;margin-top:14px;font-size:14px;color:var(--muted);}
.feature .tags{color:var(--on-dark-muted);}
.badge{display:inline-block;font-size:12px;line-height:1.6;padding:1px 10px;border-radius:980px;border:1px solid var(--muted);color:var(--muted);}
.badge.live{border-color:#1d8f3a;color:#1d7a34;}
.badge.wip{border-color:#b86e00;color:#8a5200;}
.feature .badge.wip{border-color:#ff9f0a;color:#ff9f0a;}
.case p{margin-top:18px;font-size:17px;line-height:1.55;}
.case ul{margin-top:18px;}
.case li{padding:12px 0;border-top:1px solid var(--line);font-size:15px;line-height:1.55;color:var(--muted);}
.feature li{border-top-color:var(--line-dark);color:var(--on-dark-muted);}
.feature .cols{display:grid;grid-template-columns:1fr 1fr;gap:0 64px;align-items:start;}
.case a.ext{display:inline-block;margin-top:20px;}

/* 技术栈 */
.stack{display:grid;grid-template-columns:repeat(3,1fr);gap:0 48px;}
.stack div{padding:24px 0 28px;border-top:1px solid var(--line-dark);}
.stack dt{font-size:21px;font-weight:600;color:var(--on-dark);}
.stack dd{margin-top:8px;font-size:15px;line-height:1.8;color:var(--on-dark-muted);}

/* 工作方式 */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:32px;}
.steps li{text-align:center;position:relative;}
.steps .n{display:grid;place-items:center;width:48px;height:48px;margin:0 auto 18px;border-radius:50%;background:var(--parchment);font-size:19px;font-weight:600;position:relative;z-index:1;}
.steps li::before{content:"";position:absolute;top:24px;left:-50%;width:100%;height:1px;background:var(--line);}
.steps li:first-child::before{display:none;}
.steps h3{font-size:21px;line-height:1.25;}
.steps p{margin-top:8px;font-size:15px;line-height:1.55;color:var(--muted);}

/* 关于 */
.about-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:72px;align-items:start;}
.about-grid h2{font-size:clamp(28px,3.8vw,40px);line-height:1.15;letter-spacing:-.01em;}
.about-grid .copy p{margin-top:16px;color:var(--muted);max-width:34em;}
.proof{background:var(--parchment);border-radius:28px;padding:36px 32px 28px;}
.proof h3{font-size:24px;line-height:1.2;}
.proof p{margin-top:10px;font-size:15px;color:var(--muted);}
.proof ul{margin-top:18px;}
.proof li{padding:12px 0;border-top:1px solid var(--line);font-size:15px;}

/* 联系 */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:72px;align-items:center;}
.contact h2{font-size:clamp(30px,4.6vw,48px);line-height:1.12;letter-spacing:-.01em;}
.contact .intro{margin-top:14px;font-size:clamp(17px,2vw,21px);line-height:1.45;color:var(--on-dark-muted);max-width:22em;}
.contact .actions{justify-content:flex-start;margin-top:32px;}
#copyTip{display:block;min-height:1.8em;margin-top:14px;font-size:14px;color:var(--on-dark-muted);}
dl.info div{display:grid;grid-template-columns:4em 1fr;gap:12px;padding:18px 0;border-top:1px solid var(--line-dark);}
dl.info div:last-child{border-bottom:1px solid var(--line-dark);}
dl.info dt{color:var(--on-dark-muted);font-size:15px;}
dl.info dd{font-size:19px;word-break:break-all;}
dl.info a{text-decoration:none;color:var(--link-dark);}
dl.info a:hover{text-decoration:underline;}

/* 页脚 */
footer{background:var(--parchment);color:var(--muted);font-size:12px;line-height:1.8;padding:22px 0 calc(22px + env(safe-area-inset-bottom,0px));border-top:1px solid var(--line);}
footer .container{display:flex;flex-wrap:wrap;justify-content:space-between;gap:4px 32px;}
footer a{text-decoration:none;}
footer a:hover{text-decoration:underline;}
footer .fnav{display:flex;gap:20px;}

@media (max-width:900px){
    .block{padding:80px 0;}
    .hero{padding:64px 0 72px;}
    .page-head{padding:56px 0 48px;}
    .about-grid,.contact-grid{grid-template-columns:1fr;gap:44px;}
    .cap-grid{grid-template-columns:1fr;}
    .ov{grid-template-columns:1fr 1fr;}
    .cases{grid-template-columns:1fr;}
    .feature .cols{grid-template-columns:1fr;gap:0;}
    .stack{grid-template-columns:1fr 1fr;}
    .steps{grid-template-columns:1fr 1fr;gap:40px 24px;}
    .steps li:nth-child(odd)::before{display:none;}
    .head{margin-bottom:44px;}
}
@media (max-width:700px){
    .path{padding:32px 24px 28px;border-radius:22px;}
    .path .h{display:none;}
    .path .v{display:block;}
}
@media (max-width:600px){
    .container{padding:0 20px;}
    nav ul{gap:14px;}
    nav a{font-size:12px;}
    .brand span{font-size:15px;}
    .ov{grid-template-columns:1fr;}
    .stack{grid-template-columns:1fr;}
    .steps{grid-template-columns:1fr;gap:32px;}
    .steps li::before{display:none!important;}
    .case,.proof{padding:32px 24px 26px;border-radius:22px;}
}

/* 顶栏在窄屏上保持单行 */
.brand,nav a{white-space:nowrap;}
@media (max-width:600px){.bar{gap:12px;}nav ul{gap:12px;}}
@media (max-width:400px){.brand span{display:none;}}