/* 苏哲游戏 games.suzhe.ai
   设计语言沿用主站 suzhe.ai（白 / #f5f5f7 交替 + 深色章节 + 蓝色胶囊按钮） */

:root{
  --f-text:-apple-system,BlinkMacSystemFont,"SF Pro Text","Inter","PingFang SC","Hiragino Sans GB","Noto Sans CJK SC","Noto Sans SC","Microsoft YaHei",sans-serif;
  --f-display:-apple-system,BlinkMacSystemFont,"SF Pro Display","Inter","PingFang SC","Hiragino Sans GB","Noto Sans CJK SC","Noto Sans SC","Microsoft YaHei",sans-serif;

  --bg:#fff; --bg-2:#f5f5f7; --bg-3:#e8e8ed;
  --ink:#1d1d1f; --ink-2:#6e6e73; --ink-3:#86868b;
  --line:#d2d2d7; --line-2:#e8e8ed;
  --blue:#0071e3; --blue-h:#0077ed;
  --green:#1d7d38;

  --r-xl:28px; --r-lg:18px; --r-md:12px; --pill:980px;
  --ease:cubic-bezier(.28,.11,.32,1);
  --nav-h:48px; --wrap:1120px; --gut:22px;
  --sh-card:0 1px 2px rgba(0,0,0,.04),0 6px 18px rgba(0,0,0,.05);
  --sh-card-h:0 2px 6px rgba(0,0,0,.05),0 18px 40px rgba(0,0,0,.1);
}

*,*::before,*::after{box-sizing:border-box}

html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

body{
  margin:0;
  font-family:var(--f-text);
  font-size:17px;
  line-height:1.55;
  color:var(--ink);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

img{max-width:100%;display:block}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 var(--gut)}
.wrap-narrow{max-width:820px}

/* ---------- nav ---------- */
.nav{
  position:sticky;top:0;z-index:100;
  height:var(--nav-h);
  background:rgba(255,255,255,.72);
  backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid transparent;
  transition:border-color .3s var(--ease),background .3s var(--ease);
}
.nav.is-scrolled{border-bottom-color:var(--line-2)}
.nav-inner{
  max-width:var(--wrap);margin:0 auto;height:100%;
  padding:0 var(--gut);
  display:flex;align-items:center;gap:28px;
}
.brand{display:flex;align-items:center;gap:9px;color:var(--ink);text-decoration:none}
.brand:hover{text-decoration:none}
.brand-mark{
  width:26px;height:26px;border-radius:8px;
  background:var(--ink);color:#fff;
  display:grid;place-items:center;
  font-size:14px;font-weight:600;line-height:1;
}
.brand-mark-sm{width:22px;height:22px;border-radius:7px;font-size:12px}
.brand-name{font-size:15px;font-weight:600;letter-spacing:-.01em}

.nav-links{display:flex;gap:26px;margin-left:auto}
.nav-links a{
  font-size:13.5px;color:var(--ink-2);text-decoration:none;
  transition:color .2s var(--ease);
}
.nav-links a:hover{color:var(--ink);text-decoration:none}
.nav .btn{margin-left:8px}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  border:0;cursor:pointer;
  font-family:inherit;font-size:16px;font-weight:500;
  padding:12px 26px;border-radius:var(--pill);
  text-decoration:none;
  transition:background .22s var(--ease),color .22s var(--ease),transform .22s var(--ease),border-color .22s var(--ease);
}
.btn:hover{text-decoration:none}
.btn:active{transform:scale(.98)}
.btn-sm{font-size:14px;padding:8px 18px}

.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-h);color:#fff}

.btn-ghost{background:transparent;color:var(--blue)}
.btn-ghost:hover{background:rgba(0,113,227,.06);color:var(--blue)}

/* ---------- hero ---------- */
.hero{padding:104px 0 92px;background:var(--bg)}
.hero-inner{text-align:center;max-width:920px}
.eyebrow{
  margin:0 0 14px;
  font-size:12px;font-weight:600;letter-spacing:.14em;
  text-transform:uppercase;color:var(--ink-3);
}
.hero h1{
  margin:0;
  font-family:var(--f-display);
  font-size:clamp(34px,5.4vw,64px);
  line-height:1.06;
  letter-spacing:-.024em;
  font-weight:600;
}
.hero-sub{
  margin:22px auto 0;max-width:600px;
  font-size:clamp(17px,2.1vw,21px);
  line-height:1.45;color:var(--ink-2);
  letter-spacing:-.01em;
  text-wrap:balance;
}
.hero-actions{display:flex;gap:20px;justify-content:center;align-items:center;margin-top:34px;flex-wrap:wrap}
.hero-note{margin:26px 0 0;font-size:13px;color:var(--ink-3)}

/* ---------- section ---------- */
.section{padding:92px 0}
.section-gray{background:var(--bg-2)}
.section-dark{background:#1d1d1f;color:#f5f5f7}
.section-dark .eyebrow{color:#86868b}

.section h2{
  margin:0 0 16px;
  font-family:var(--f-display);
  font-size:clamp(28px,3.6vw,44px);
  line-height:1.1;letter-spacing:-.02em;font-weight:600;
}
.section-dark h2{color:#f5f5f7}
.lede{margin:0 0 44px;max-width:640px;font-size:17px;color:var(--ink-2)}
.section-dark .lede{color:#a1a1a6}

/* ---------- categories ---------- */
.cats{
  display:grid;grid-template-columns:repeat(4,1fr);gap:18px;
  margin-bottom:56px;
}
.cat{
  background:#fff;border-radius:var(--r-lg);padding:26px 24px 28px;
  box-shadow:var(--sh-card);
  transition:box-shadow .3s var(--ease),transform .3s var(--ease);
}
.cat:hover{box-shadow:var(--sh-card-h);transform:translateY(-2px)}
.cat-mark{
  width:38px;height:38px;border-radius:11px;
  background:var(--bg-2);color:var(--ink);
  display:grid;place-items:center;
  font-size:17px;font-weight:600;margin-bottom:16px;
}
.cat h3{margin:0 0 8px;font-size:17px;font-weight:600;letter-spacing:-.01em}
.cat p{margin:0;font-size:14px;line-height:1.55;color:var(--ink-2)}

/* ---------- product cards ---------- */
.plist{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.pcard{
  background:#fff;border-radius:var(--r-lg);padding:22px 22px 20px;
  display:flex;flex-direction:column;
  box-shadow:var(--sh-card);
  transition:box-shadow .3s var(--ease),transform .3s var(--ease);
}
.pcard:hover{box-shadow:var(--sh-card-h);transform:translateY(-2px)}
.pcard-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}
.ptag{
  font-size:11.5px;font-weight:600;letter-spacing:.04em;
  color:var(--ink);background:var(--bg-2);
  padding:3px 9px;border-radius:6px;
}
.pstate{font-size:12px;color:var(--green);font-weight:500}
.pcard h3{margin:0 0 8px;font-size:16px;font-weight:600;letter-spacing:-.01em}
.pcard p{margin:0 0 18px;font-size:13.5px;line-height:1.55;color:var(--ink-2);flex:1}
.pcard-link{font-size:13.5px;font-weight:500;color:var(--blue);text-decoration:none}
.pcard-link:hover{text-decoration:underline}

/* ---------- promises ---------- */
.promises{display:grid;grid-template-columns:repeat(4,1fr);gap:36px;margin-top:44px}
.promise h3{margin:0 0 10px;font-size:19px;font-weight:600;letter-spacing:-.015em}
.promise p{margin:0;font-size:15px;line-height:1.6;color:var(--ink-2)}

/* ---------- flow ---------- */
.flow{
  list-style:none;margin:48px 0 0;padding:0;
  display:grid;grid-template-columns:repeat(4,1fr);gap:36px;
  counter-reset:none;
}
.flow li{position:relative;padding-top:26px;border-top:1px solid rgba(255,255,255,.16)}
.flow-n{
  display:block;font-family:var(--f-display);
  font-size:13px;font-weight:600;letter-spacing:.1em;
  color:#86868b;margin-bottom:12px;
}
.flow h3{margin:0 0 10px;font-size:19px;font-weight:600;letter-spacing:-.015em;color:#f5f5f7}
.flow p{margin:0;font-size:15px;line-height:1.6;color:#a1a1a6}
.flow-note{margin:44px 0 0;font-size:13.5px;color:#86868b}

/* ---------- faq ---------- */
.faq{margin-top:36px;border-top:1px solid var(--line-2)}
.faq details{border-bottom:1px solid var(--line-2)}
.faq summary{
  cursor:pointer;list-style:none;
  padding:22px 34px 22px 0;position:relative;
  font-size:17px;font-weight:500;letter-spacing:-.01em;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{
  content:"";position:absolute;right:6px;top:50%;
  width:9px;height:9px;margin-top:-6px;
  border-right:1.5px solid var(--ink-2);border-bottom:1.5px solid var(--ink-2);
  transform:rotate(45deg);
  transition:transform .25s var(--ease);
}
.faq details[open] summary::after{transform:rotate(-135deg);margin-top:-2px}
.faq details p{margin:0 0 24px;font-size:15px;line-height:1.65;color:var(--ink-2);max-width:680px}

/* ---------- contacts ---------- */
.contacts{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.contact{
  background:#fff;border-radius:var(--r-lg);padding:28px 26px 26px;
  box-shadow:var(--sh-card);
}
.contact h3{margin:0 0 18px;font-size:17px;font-weight:600;letter-spacing:-.01em}
.contact-kv{display:flex;flex-direction:column;gap:4px;margin:0 0 18px}
.kv-label{font-size:12px;color:var(--ink-3);letter-spacing:.04em}
.kv-value{font-family:ui-monospace,"SF Mono",Menlo,Consolas,monospace;font-size:16px;font-weight:500;word-break:break-all}
.contact-note{margin:16px 0 0;font-size:12.5px;color:var(--ink-3);line-height:1.5}
.qr{
  width:180px;height:180px;border-radius:12px;
  border:1px solid var(--line-2);background:#fff;
}

/* copy button feedback */
.btn.is-copied{background:var(--green)}

/* ---------- footer ---------- */
.foot{background:var(--bg);border-top:1px solid var(--line-2);padding:40px 0 46px}
.foot-inner{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
.foot-left{display:flex;align-items:center;gap:9px;font-size:13px;color:var(--ink-2)}
.foot-right{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--ink-2)}
.foot-right a{color:var(--ink-2);text-decoration:none}
.foot-right a:hover{color:var(--ink);text-decoration:underline}
.foot-sep{color:var(--line)}
.foot-note{margin:22px 0 0;font-size:12px;line-height:1.6;color:var(--ink-3);max-width:760px}

/* ---------- responsive ---------- */
@media (max-width:1024px){
  .cats,.plist,.promises{grid-template-columns:repeat(2,1fr)}
  .flow{grid-template-columns:repeat(2,1fr);gap:32px}
  .contacts{grid-template-columns:1fr 1fr}
  .contacts .contact:nth-child(3){grid-column:1 / -1}
}
@media (max-width:720px){
  body{font-size:16px}
  .nav-links{display:none}
  .nav .btn{margin-left:auto}
  .hero{padding:64px 0 60px}
  .hero h1{letter-spacing:-.02em}
  .br-desk{display:none}
  .hero-actions{gap:12px;flex-direction:column;align-items:stretch}
  .hero-actions .btn{width:100%}
  .section{padding:64px 0}
  .cats,.plist,.promises,.flow,.contacts{grid-template-columns:1fr}
  .contacts .contact:nth-child(3){grid-column:auto}
  .foot-inner{flex-direction:column;align-items:flex-start}
}