:root{--paper:#f7f2e9;--paper2:#fffdf8;--ink:#1f211d;--muted:#746f65;--line:#ddd5c9;--green:#263a2d;--warm:#9b673d;--shadow:0 28px 80px rgba(60,45,30,.12)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,"PingFang SC","Microsoft YaHei",sans-serif}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}.top{height:70px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:0 clamp(20px,4vw,64px);border-bottom:1px solid var(--line);background:rgba(255,253,248,.92);backdrop-filter:blur(16px);position:sticky;top:0;z-index:30}.brand{justify-self:start;display:flex;align-items:baseline;gap:10px}.brand b{font-family:Georgia,serif;font-size:24px;letter-spacing:.03em}.brand span{font-family:Georgia,serif;color:#8e877d;font-size:12px}.topnav{display:flex;gap:28px;color:#625e56;font-size:13px}.back{justify-self:end;padding:9px 13px;border:1px solid #cfc7bb;border-radius:7px;font-size:12px;background:#fff}.hero{width:min(1320px,calc(100% - 40px));margin:0 auto;padding:72px 0 46px;display:grid;grid-template-columns:minmax(0,.75fr) minmax(520px,1.25fr);gap:64px;align-items:center}.eyebrow{margin:0 0 13px;color:var(--warm);font-size:11px;font-weight:850;letter-spacing:.17em}.hero h1{margin:0 0 20px;font-family:"Songti SC","STSong",serif;font-size:clamp(46px,5.2vw,76px);line-height:1.06;letter-spacing:-.035em}.hero .lead{max-width:650px;margin:0;color:var(--muted);font-size:17px;line-height:1.9}.meta{display:flex;gap:18px;flex-wrap:wrap;margin:26px 0 0}.meta div{padding-right:18px;border-right:1px solid var(--line)}.meta div:last-child{border-right:0}.meta strong,.meta small{display:block}.meta strong{font-family:"Songti SC","STSong",serif;font-size:17px}.meta small{margin-top:4px;color:#8f897e;font-size:11px}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;padding:12px 18px;border:1px solid #2b3c30;border-radius:7px;font-weight:800;font-size:13px}.btn.primary{background:var(--green);color:#fff}.stage{padding:14px;border:1px solid #d7cfc3;border-radius:18px;background:#e8dccb;box-shadow:var(--shadow)}.browser{overflow:hidden;border:1px solid #cfc8bd;border-radius:12px;background:#fff;box-shadow:0 22px 60px rgba(58,43,28,.14)}.browserbar{height:38px;display:flex;align-items:center;gap:7px;padding:0 12px;background:#f4f1ec;border-bottom:1px solid #ddd7ce}.browserbar i{width:8px;height:8px;border-radius:50%;background:#c9c2b7}.browserbar span{margin-left:10px;color:#918b80;font-size:10px}.browser iframe{display:block;width:100%;height:620px;border:0;background:#fff}.section{width:min(1180px,calc(100% - 40px));margin:0 auto;padding:64px 0;border-top:1px solid var(--line)}.section-head{display:grid;grid-template-columns:.7fr 1.3fr;gap:50px;margin-bottom:34px}.section h2{margin:0;font-family:"Songti SC","STSong",serif;font-size:38px}.section-head p{margin:0;color:var(--muted);line-height:1.9}.flow{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1px solid var(--line);border-radius:10px;background:#fff;overflow:hidden}.flow article{padding:24px;border-right:1px solid var(--line)}.flow article:last-child{border-right:0}.flow b{display:block;color:var(--warm);font-family:Georgia,serif;font-size:15px}.flow h3{margin:12px 0 8px;font-family:"Songti SC","STSong",serif;font-size:18px}.flow p{margin:0;color:#7b756b;font-size:12px;line-height:1.7}.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.card{padding:26px;border:1px solid var(--line);border-radius:10px;background:#fff}.card .icon{display:grid;place-items:center;width:38px;height:38px;border-radius:50%;background:#efe5d7;color:var(--warm);font-weight:900}.card h3{margin:16px 0 8px;font-family:"Songti SC","STSong",serif;font-size:20px}.card p{margin:0;color:#777168;font-size:13px;line-height:1.8}.fit{display:grid;grid-template-columns:1fr 1fr;gap:18px}.fit>div{padding:28px;border-radius:10px}.fit .yes{background:#eaf0e8;border:1px solid #cfdbcd}.fit .no{background:#f3eee6;border:1px solid #e0d6ca}.fit h3{margin:0 0 14px;font-family:"Songti SC","STSong",serif;font-size:21px}.fit ul{margin:0;padding-left:18px;color:#625f58;line-height:2}.cta{width:min(1180px,calc(100% - 40px));margin:0 auto 70px;padding:38px 42px;display:flex;justify-content:space-between;gap:28px;align-items:center;border-radius:12px;background:#29392f;color:#fff}.cta h2{margin:0 0 7px;font-family:"Songti SC","STSong",serif;font-size:31px}.cta p{margin:0;color:#d9dfda}.cta .btn{border-color:#fff;background:#fff;color:#253229;white-space:nowrap}.foot{display:flex;justify-content:space-between;gap:20px;padding:24px clamp(20px,4vw,64px);border-top:1px solid var(--line);color:#7c766d;font-size:11px;background:#fbf8f3}
@media(max-width:980px){.top{grid-template-columns:1fr auto}.topnav{display:none}.hero{grid-template-columns:1fr}.stage{order:2}.browser iframe{height:560px}.section-head{grid-template-columns:1fr;gap:12px}.flow{grid-template-columns:1fr 1fr}.flow article:nth-child(2){border-right:0}.flow article:nth-child(-n+2){border-bottom:1px solid var(--line)}.cta{align-items:flex-start;flex-direction:column}}
@media(max-width:620px){.hero{width:calc(100% - 28px);padding-top:48px;gap:36px}.hero h1{font-size:44px}.stage{padding:7px}.browser iframe{height:620px}.section{width:calc(100% - 28px);padding:48px 0}.flow,.grid,.fit{grid-template-columns:1fr}.flow article{border-right:0;border-bottom:1px solid var(--line)}.flow article:last-child{border-bottom:0}.cta{width:calc(100% - 28px);padding:28px 24px}.foot{flex-direction:column}}

/* v15 — case page polish */
:where(a,button,input,select,textarea):focus-visible{outline:3px solid rgba(155,103,61,.26);outline-offset:3px}
.btn,.back,.card,.flow article,.fit>div,.stage{transition:transform .24s ease,box-shadow .28s ease,border-color .24s ease,background-color .24s ease}
.btn:hover,.back:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(57,44,31,.09)}
.stage:hover{transform:translateY(-3px);box-shadow:0 34px 86px rgba(60,45,30,.14)}
.card:hover,.flow article:hover,.fit>div:hover{transform:translateY(-3px);box-shadow:0 15px 36px rgba(60,45,30,.07);border-color:#cbbdab}
.topnav a{position:relative}.topnav a:after{content:"";position:absolute;left:0;right:100%;bottom:-8px;height:1px;background:#9b673d;transition:right .22s ease}.topnav a:hover:after{right:0}
.browser{transition:box-shadow .3s ease}.stage:hover .browser{box-shadow:0 28px 68px rgba(58,43,28,.17)}
@media(prefers-reduced-motion:reduce){.btn,.back,.card,.flow article,.fit>div,.stage,.browser{transition:none!important}}

/* V16: keep source images within the case grid. */
.case-visual{min-width:0;overflow:hidden;border-radius:18px}.case-visual img{display:block;width:100%;height:auto}.case-visual + .stage{grid-column:1/-1}