:root{
  --brand:#f04800;--brand-d:#b83300;--brand-l:#fff0e8;--tint:#fff3ec;
  --ink:#1c1b1a;--ink2:#4f4a45;--ink3:#8d857d;--line:#f0e2d8;
  --bg:#fffdf9;--soft:#fff6f0;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.76;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
.wrap{width:min(1120px,92%);margin:0 auto}
.btn{display:inline-flex;align-items:center;gap:9px;background:var(--brand);color:#fff;font-weight:800;font-size:15px;
  padding:14px 30px;border-radius:12px;box-shadow:0 3px 0 var(--brand-d),0 12px 24px rgba(240,72,0,.24);transition:.2s}
.btn:hover{transform:translateY(-1px)}
.btn svg{width:17px;height:17px}
.sec-k{display:inline-block;font-size:10.5px;letter-spacing:3px;font-weight:800;color:var(--brand);
  background:var(--brand-l);padding:3px 10px;border-radius:99px;margin-bottom:12px}
.sec-h h2{font-size:clamp(25px,3.3vw,35px);line-height:1.28;letter-spacing:-.6px}
.sec-h p{margin-top:9px;font-size:14.4px;color:var(--ink2);max-width:620px}

/* header */
.sh{position:fixed;top:0;left:0;right:0;z-index:60;background:rgba(255,253,249,.94);backdrop-filter:blur(10px);
  border-bottom:1px solid transparent;transition:.25s}
.sh.on{border-bottom-color:var(--line);box-shadow:0 4px 18px rgba(184,51,0,.06)}
.sh-in{display:flex;align-items:center;gap:20px;height:64px}
.sh-brand{display:flex;align-items:center;gap:9px}
.sh-brand img{border-radius:10px}
.sh-brand strong{display:block;font-size:16px;letter-spacing:.4px}
.sh-brand small{display:block;font-size:10.5px;color:var(--ink3);letter-spacing:1px}
.sh nav{display:flex;gap:22px;margin-left:auto;font-size:13.5px;color:var(--ink2)}
.sh nav a{padding:4px 0;border-bottom:2px solid transparent}
.sh nav a:hover{color:var(--brand);border-bottom-color:var(--brand)}
.sh-cta{background:var(--brand);color:#fff;font-weight:800;font-size:13.5px;padding:9px 20px;border-radius:10px;
  box-shadow:0 2px 0 var(--brand-d)}
.sh nav .sh-cta{padding:9px 20px;color:#fff;border-bottom:0;margin-left:4px}
.sh nav .sh-cta:hover{color:#fff;border-bottom-color:transparent}
.sh-menu{display:none;margin-left:auto;background:none;border:0;color:var(--ink);width:38px;height:38px;
  align-items:center;justify-content:center}

/* hero4 */
.hero4{padding:104px 0 0;background:radial-gradient(70% 55% at 50% 0,#ffe9dc 0%,transparent 68%),var(--bg);text-align:center}
.hero4 .kicker{display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:800;letter-spacing:1.5px;
  color:var(--brand-d);background:#fff;border:1px solid var(--line);padding:5px 13px;border-radius:99px}
.hero4 .kicker i{width:6px;height:6px;border-radius:50%;background:var(--brand)}
.hero4 h1{font-size:clamp(44px,7vw,72px);line-height:1.02;letter-spacing:-3px;margin:12px 0 10px}
.hero4 h1 u{text-decoration:none;color:var(--brand)}
.hero4 .lead{font-size:clamp(18px,2.4vw,24px);font-weight:800;color:var(--ink)}
.hero4 .desc{margin:12px auto 0;font-size:14.6px;color:var(--ink2);max-width:640px}
.hero4 .acts{margin:22px 0 10px}
.hero4 .upd{font-size:12px;color:var(--ink3)}
.hero4 .upd time{font-weight:800;color:var(--ink2);font-variant-numeric:tabular-nums}
.stage{display:flex;justify-content:center;align-items:flex-end;gap:22px;margin-top:26px;padding-bottom:0}
.ph{background:#fff;border:1px solid var(--line);border-radius:20px;padding:7px;box-shadow:0 18px 40px rgba(184,51,0,.12)}
.ph img{width:100%;height:100%;object-fit:cover;border-radius:14px}
.ph.side{width:190px;height:388px;transform:rotate(-4deg);opacity:.92}
.ph.side.r{transform:rotate(4deg)}
.ph.main{width:252px;height:470px;border-radius:26px;position:relative;z-index:2}
.ph.main::after{content:"竖屏一滑到底";position:absolute;left:50%;bottom:-13px;transform:translateX(-50%);
  background:var(--brand);color:#fff;font-size:10px;font-weight:800;letter-spacing:1px;padding:3px 11px;border-radius:99px;white-space:nowrap}

/* strip */
.strip{background:var(--ink);color:#fff;margin-top:26px;padding:13px 0;overflow:hidden}
.strip-in{display:flex;gap:34px;justify-content:center;flex-wrap:wrap;font-size:12px;color:rgba(255,255,255,.72)}
.strip-in b{color:#fff;font-size:13px;margin-right:5px}
.strip-in span{display:inline-flex;align-items:center;gap:7px}
.strip-in span::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--brand)}

/* feat4 */
.feat4{padding:56px 0 74px;background:var(--bg)}
.feat4 .sec-h{margin-bottom:24px}
.grid4{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.item4{position:relative;background:#fff;border:1px solid var(--line);border-left:4px solid var(--brand);border-radius:10px;
  padding:20px 22px;overflow:hidden}
.item4::after{content:attr(data-n);position:absolute;right:12px;top:4px;font-size:46px;font-weight:800;color:var(--brand-l);line-height:1}
.item4 h4{font-size:15.4px;margin-bottom:4px;position:relative;z-index:1}
.item4 p{font-size:13.1px;color:var(--ink2);position:relative;z-index:1}
.item4 .tag{display:inline-block;margin-top:8px;font-size:10.5px;color:var(--brand-d);background:var(--brand-l);
  border-radius:99px;padding:2px 9px}

/* trio */
.trio{padding:72px 0 66px;background:var(--soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.trio .sec-h{margin-bottom:26px}
.trio-row{display:flex;gap:18px;overflow-x:auto;scroll-snap-type:x mandatory;padding:6px 2px 14px}
.trio-row li{flex:1;min-width:230px;scroll-snap-align:start;background:#fff;border:1px solid var(--line);border-radius:14px;
  padding:8px 8px 12px}
.trio-row img{width:100%;height:380px;object-fit:cover;border-radius:9px}
.trio-row figcaption{padding:10px 6px 0;font-size:12.3px;color:var(--ink2)}
.trio-row figcaption b{display:block;font-size:13.4px;color:var(--ink)}
.trio-row figcaption em{font-style:normal;display:inline-block;font-size:10px;font-weight:800;letter-spacing:1.5px;
  color:var(--brand);margin-bottom:3px}
.trio-notes{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:20px}
.trio-notes div{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 16px;font-size:12.7px;color:var(--ink2)}
.trio-notes b{display:block;color:var(--ink);font-size:13.3px}
/* guide */
.guide{padding:70px 0 64px;background:var(--bg)}
.guide .sec-h{margin-bottom:24px}
.gbox{background:var(--soft);border:1px solid var(--line);border-radius:16px;padding:24px 26px}
.gbox ol{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:18px 22px;counter-reset:g}
.gbox li{counter-increment:g;position:relative;padding-left:31px;font-size:12.9px;color:var(--ink2)}
.gbox li::before{content:counter(g);position:absolute;left:0;top:2px;width:21px;height:21px;border-radius:50%;
  background:var(--brand);color:#fff;font-size:11px;font-weight:800;display:grid;place-items:center}
.gbox li b{display:block;color:var(--ink);font-size:13.4px;margin-bottom:2px}

/* faq4 */
.faq4{padding:72px 0 66px;background:#fff}
.faq4 .sec-h{margin-bottom:24px}
.faq4-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.q4{border:1px solid var(--line);border-radius:12px;padding:16px 18px;background:var(--bg)}
.q4 h3{font-size:14.2px;display:flex;gap:9px;align-items:flex-start;margin-bottom:5px;line-height:1.6}
.q4 h3 span{flex:none;display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;
  border-radius:6px;background:var(--brand);color:#fff;font-size:10.5px;font-weight:800;margin-top:2px}
.q4 p{font-size:12.8px;color:var(--ink2)}

/* comments */
.wall{padding:70px 0 66px;background:var(--bg)}
.wall .sec-h{margin-bottom:22px}
.wall-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.wall .c4{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px 17px;display:flex;flex-direction:column}
.wall .stars{color:var(--brand);font-size:12px;letter-spacing:2px;margin-bottom:7px}
.wall .c4 p{font-size:12.7px;color:var(--ink2);flex:1}
.wall .c4 footer{margin-top:10px;padding-top:9px;border-top:1px dashed var(--line);font-size:11.2px;color:var(--ink3);
  display:flex;justify-content:space-between;gap:8px}
.wall .c4 footer b{color:var(--ink);font-size:12.2px}
.wall .c4 footer time{font-variant-numeric:tabular-nums}

/* grab4 */
.grab4{padding:0 0 76px;background:var(--bg)}
.grab4-card{background:linear-gradient(120deg,#ff6a1f,#e23c00);border-radius:22px;padding:8px;color:#fff;
  box-shadow:0 20px 44px rgba(240,72,0,.24)}
.grab4-in{background:rgba(0,0,0,.14);border-radius:16px;padding:30px 32px;display:flex;align-items:center;gap:26px;flex-wrap:wrap}
.grab4-in img{width:60px;height:60px;border-radius:14px;flex:none;box-shadow:0 6px 16px rgba(0,0,0,.2)}
.grab4-in h2{font-size:clamp(22px,3vw,30px);line-height:1.3}
.grab4-in p{font-size:13.3px;color:rgba(255,255,255,.82);margin-top:6px;max-width:540px}
.grab4-in .btn{background:#fff;color:var(--brand-d);box-shadow:0 3px 0 rgba(0,0,0,.16);margin-left:auto}
.grab4-in .meta{display:flex;gap:14px;flex-wrap:wrap;margin-top:11px;font-size:11.3px;color:rgba(255,255,255,.66)}

/* footer */
.ft{background:#171614;color:rgba(255,255,255,.6);padding:44px 0 24px;font-size:12.5px}
.ft-in{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:28px}
.ft-brand{display:flex;align-items:center;gap:9px;color:#fff;font-size:15px;font-weight:800;margin-bottom:8px}
.ft-brand img{border-radius:8px}
.ft h4{color:#fff;font-size:12.7px;margin-bottom:8px;letter-spacing:.6px}
.ft-col a,.ft-col span{display:block;margin-bottom:5px;font-size:12.1px;color:rgba(255,255,255,.55)}
.ft-col a:hover{color:#ff8a4d}
.ft-copy{margin-top:28px;padding-top:15px;border-top:1px solid rgba(255,255,255,.12);font-size:11.4px;
  color:rgba(255,255,255,.4);line-height:1.9}

.backtop{position:fixed;right:24px;bottom:84px;width:42px;height:42px;border-radius:50%;border:1px solid var(--line);
  background:#fff;color:var(--brand-d);display:flex;align-items:center;justify-content:center;cursor:pointer;
  box-shadow:0 6px 18px rgba(184,51,0,.16);opacity:0;visibility:hidden;transition:.25s;z-index:55}
.backtop.on{opacity:1;visibility:visible}

@media (max-width:1000px){
  .grid4{grid-template-columns:1fr}
  .trio-row li{flex:0 0 46%}
  .gbox ol{grid-template-columns:1fr 1fr}
  .wall-grid{grid-template-columns:1fr 1fr}
  .ph.side{display:none}
  .ph.main{width:268px;height:500px}
}
@media (max-width:720px){
  .sh nav{display:none}
  .sh-menu{display:inline-flex}
  .sh nav.open .sh-cta{margin-left:0;text-align:center}
  .sh nav.open{display:flex;position:absolute;top:64px;left:0;right:0;background:var(--bg);flex-direction:column;
    padding:14px 22px 18px;gap:14px;border-bottom:1px solid var(--line)}
  .hero4{padding-top:88px}
  .stage{gap:0;margin-top:20px}
  .ph.main{width:236px;height:440px}
  .faq4-grid,.wall-grid,.trio-notes{grid-template-columns:1fr}
  .gbox ol{grid-template-columns:1fr}
  .trio-row li{flex:0 0 78%}
  .trio-row img{height:340px}
  .ft-in{grid-template-columns:1fr}
  .btn{width:100%;justify-content:center}
  .grab4-in{padding:22px}
  .grab4-in .btn{margin-left:0}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
}