/* ============================================================
   开物成务 · Patefio —— 站点样式
   设计语言取自 deepseek.com 源码提取的设计令牌：
   品牌蓝 #4d6bfe / 深蓝标题 #152443 / 页面底 #f9f8f8(暗色 #0a0a0a)
   字体 DM Sans + 系统中文回退；玻璃模糊 12px；圆角 24/16/12/8
   ============================================================ */

/* ---------- 字体 ---------- */
@font-face{font-family:"DM Sans";font-style:normal;font-weight:400;font-display:swap;src:url("fonts/dm-sans-400.woff2") format("woff2")}
@font-face{font-family:"DM Sans";font-style:normal;font-weight:500;font-display:swap;src:url("fonts/dm-sans-500.woff2") format("woff2")}
@font-face{font-family:"DM Sans";font-style:normal;font-weight:700;font-display:swap;src:url("fonts/dm-sans-700.woff2") format("woff2")}

/* ---------- 设计令牌 ---------- */
:root{
  color-scheme:light;
  --ease:cubic-bezier(.16,1,.3,1);
  --font-sans:"DM Sans",system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;

  --brand:#4d6bfe;--brand-hover:#4160f0;--brand-rgb:77,107,254;
  --bg-page:#f9f8f8;--bg-card:#ffffff;--bg-surface:rgba(255,255,255,.55);
  --nav-bg:rgba(249,248,248,.72);

  --text-1:#1e232c;--text-1-bluish:#152443;--text-2:rgba(0,0,0,.66);--text-3:rgba(0,0,0,.45);

  --border-subtle:rgba(0,0,0,.06);--border:rgba(0,0,0,.1);--border-2:rgba(9,45,78,.22);
  --glass:rgba(255,255,255,.5);--glass-hover:rgba(255,255,255,.8);--glass-border:rgba(255,255,255,.7);--glass-border-hover:rgba(255,255,255,.95);
  --hover-bg:rgba(0,0,0,.04);

  --card-shadow:0 0 0 1px #f1f5f9,0 2px 4px rgba(0,0,0,.05),0 12px 24px rgba(0,0,0,.05);
  --card-shadow-hover:0 0 0 1px #e8eef6,0 6px 16px rgba(9,45,78,.07),0 20px 44px rgba(9,45,78,.10);
  --icon-bg:rgba(77,107,254,.09);

  --hero-wash:linear-gradient(180deg,#9cc1e7 0%,rgba(249,248,248,0) 100%);
  --overlay-bg:rgba(249,248,248,.72);
  --flow-opacity:.85;

  --r-card:24px;--r-panel:16px;--r-pill:100px;--r-sm:10px;
  --blur-glass:12px;
}
[data-theme="dark"]{
  color-scheme:dark;
  --brand:#6799fe;--brand-hover:#7aa8ff;--brand-rgb:103,153,254;
  --bg-page:#0a0a0a;--bg-card:#131316;--bg-surface:rgba(255,255,255,.06);
  --nav-bg:rgba(10,10,10,.72);
  --text-1:#ffffff;--text-1-bluish:#f2f6ff;--text-2:hsla(0,0%,100%,.78);--text-3:hsla(0,0%,100%,.5);
  --border-subtle:hsla(0,0%,100%,.08);--border:hsla(0,0%,100%,.12);--border-2:hsla(0,0%,100%,.24);
  --glass:hsla(0,0%,100%,.08);--glass-hover:hsla(0,0%,100%,.15);--glass-border:hsla(0,0%,100%,.18);--glass-border-hover:hsla(0,0%,100%,.32);
  --hover-bg:hsla(0,0%,100%,.06);
  --card-shadow:hsla(0,0%,100%,.10) 0 1px 0 0 inset,0 8px 24px rgba(0,0,0,.4);
  --card-shadow-hover:hsla(0,0%,100%,.14) 0 1px 0 0 inset,0 14px 40px rgba(0,0,0,.55);
  --icon-bg:rgba(103,153,254,.14);
  --hero-wash:linear-gradient(180deg,rgba(77,107,254,.22) 0%,rgba(10,10,10,0) 100%);
  --overlay-bg:rgba(16,16,18,.72);
  --flow-opacity:1;
}

/* ---------- 基础 ---------- */
*{margin:0;padding:0;box-sizing:border-box}
html{height:100%;scroll-behavior:smooth}
body{
  min-height:100%;
  background:var(--bg-page);color:var(--text-1);
  font-family:var(--font-sans);
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;
  transition:background .4s ease;
}
a{color:inherit}
::selection{background:rgba(var(--brand-rgb),.22)}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-thumb{background:rgba(0,0,0,.15);border-radius:100px;border:3px solid transparent;background-clip:content-box}
[data-theme="dark"] ::-webkit-scrollbar-thumb{background:hsla(0,0%,100%,.2);border:3px solid transparent;background-clip:content-box}

/* ---------- 背景流场 ---------- */
#flow-canvas{
  position:fixed;inset:0;width:100%;height:100%;
  z-index:0;pointer-events:none;
  filter:blur(28px) saturate(1.05);
  opacity:var(--flow-opacity);
  transform:translate3d(calc(var(--mx,0)*-8px),calc(var(--my,0)*-6px),0) scale(1.02);
  will-change:transform;
}

/* ---------- 导航 ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:50;
  border-bottom:1px solid transparent;
  transition:background .35s ease,border-color .35s ease;
}
.nav.scrolled{
  background:var(--nav-bg);
  -webkit-backdrop-filter:blur(var(--blur-glass)) saturate(1.4);
  backdrop-filter:blur(var(--blur-glass)) saturate(1.4);
  border-bottom-color:var(--border-subtle);
}
.nav-inner{max-width:1200px;margin:0 auto;height:64px;display:flex;align-items:center;justify-content:space-between;padding:0 24px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text-1)}
.brand .mark{width:26px;height:26px;flex:none}
.brand-name{font-size:16px;font-weight:600;letter-spacing:.02em}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-link{font-size:14px;color:var(--text-2);text-decoration:none;padding:8px 12px;border-radius:10px;transition:color .25s,background .25s}
.nav-link:hover{color:var(--text-1);background:var(--hover-bg)}
.nav-link[aria-current="page"]{color:var(--text-1);font-weight:500}
.theme-toggle{width:36px;height:36px;margin-left:8px;border-radius:50%;border:1px solid var(--border-subtle);background:var(--bg-surface);color:var(--text-2);display:grid;place-items:center;cursor:pointer;transition:color .25s,background .25s,transform .25s var(--ease)}
.theme-toggle:hover{color:var(--text-1);transform:scale(1.06)}
.theme-toggle svg{width:16px;height:16px}
.theme-toggle .moon{display:none}
[data-theme="dark"] .theme-toggle .sun{display:none}
[data-theme="dark"] .theme-toggle .moon{display:block}

/* ---------- Hero ---------- */
.hero{
  position:relative;z-index:1;
  min-height:100vh;min-height:100svh;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:150px 24px 90px;text-align:center;
}
.wash{
  position:absolute;top:0;left:50%;
  width:100vw;height:min(74vh,760px);
  background:var(--hero-wash);pointer-events:none;z-index:-1;
  transform:translateX(-50%) translate3d(calc(var(--mx,0)*14px),calc(var(--my,0)*10px),0);
  transition:background .4s ease;
  will-change:transform;
}
.hero-inner{width:100%;display:flex;flex-direction:column;align-items:center}
.kicker{font-size:13px;letter-spacing:.22em;color:var(--text-3);text-indent:.22em}
.slogan{
  margin-top:26px;font-weight:400;font-size:clamp(24px,5.4vw,50px);letter-spacing:.2em;line-height:1.66;color:var(--text-1-bluish);
  transform:translate3d(calc(var(--mx,0)*5px),calc(var(--my,0)*4px),0);
  will-change:transform;
}
.slogan .line{display:block;padding-left:.2em}

/* ---------- 加强动效（桌面端） ---------- */
.slogan .ch{display:inline-block;opacity:0;filter:blur(10px);transform:translateY(16px);animation:chIn .95s var(--ease) forwards;animation-delay:var(--cd,0s)}
@keyframes chIn{to{opacity:1;filter:none;transform:none}}
.kicker .star{display:inline-block;animation:spark 2.8s ease-in-out infinite}
@keyframes spark{0%,100%{opacity:.7;transform:scale(1)}50%{opacity:1;transform:scale(1.28)}}
.cards-inner .card:nth-child(2){transition-delay:.12s}
.spot{
  position:fixed;left:0;top:0;width:640px;height:640px;border-radius:50%;
  pointer-events:none;z-index:0;opacity:0;
  background:radial-gradient(circle,rgba(77,107,254,.13),rgba(77,107,254,0) 62%);
  transition:opacity .9s ease;
  will-change:transform;
  transform:translate3d(-9999px,-9999px,0);
}
[data-theme="dark"] .spot{background:radial-gradient(circle,rgba(103,153,254,.16),rgba(103,153,254,0) 62%)}
.has-pointer .spot{opacity:1}

/* 按钮 */
.cta{margin-top:34px;display:flex;gap:14px;flex-wrap:wrap;justify-content:center}
.btn{
  display:inline-flex;align-items:center;gap:9px;height:44px;padding:0 22px;
  border-radius:var(--r-pill);border:1px solid transparent;
  font:500 15px/1 var(--font-sans);text-decoration:none;cursor:pointer;
  transition:transform .3s var(--ease),background .3s,border-color .3s,box-shadow .3s;
}
.btn svg{width:16px;height:16px;flex:none}
.btn-glass{background:var(--glass);border-color:var(--glass-border);color:var(--text-1);-webkit-backdrop-filter:blur(var(--blur-glass));backdrop-filter:blur(var(--blur-glass));box-shadow:0 2px 10px rgba(9,45,78,.05)}
.btn-glass:hover{background:var(--glass-hover);border-color:var(--glass-border-hover);transform:translateY(-1px)}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 8px 24px rgba(var(--brand-rgb),.3)}
.btn-primary:hover{background:var(--brand-hover);transform:translateY(-1px);box-shadow:0 10px 28px rgba(var(--brand-rgb),.4)}
.btn .arr{transition:transform .3s var(--ease)}
.btn:hover .arr{transform:translateX(3px)}

/* ---------- 卡片区 ---------- */
.cards{position:relative;z-index:1;padding:10px 24px 110px}
.cards-inner{max-width:860px;margin:0 auto;display:grid;grid-template-columns:1fr 1fr;gap:20px}
.card{
  background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--r-card);
  padding:26px 28px;text-decoration:none;color:var(--text-1);box-shadow:var(--card-shadow);
  transition:transform .45s var(--ease),box-shadow .45s,border-color .45s;
}
.card:hover{transform:translateY(-3px);border-color:var(--border-2);box-shadow:var(--card-shadow-hover)}
.card-top{display:flex;justify-content:space-between;align-items:center}
.card-ic{width:38px;height:38px;border-radius:12px;background:var(--icon-bg);display:grid;place-items:center;color:var(--brand)}
.card-ic svg{width:19px;height:19px}
.card-arr{color:var(--text-3);transition:color .3s,transform .3s var(--ease)}
.card:hover .card-arr{color:var(--brand);transform:translateX(3px)}
.card h3{font-size:18px;font-weight:500;letter-spacing:-.01em;margin-top:16px}
.card p{margin-top:8px;font-size:14px;line-height:1.7;color:var(--text-2)}

/* ---------- 页脚 ---------- */
.footer{position:relative;z-index:1;border-top:1px solid var(--border-subtle);margin-top:20px}
.footer-inner{max-width:1200px;margin:0 auto;padding:52px 24px 34px}
.f-top{display:flex;justify-content:space-between;align-items:flex-start;gap:40px;flex-wrap:wrap}
.f-quote{margin-top:16px;max-width:380px;font-size:14px;line-height:1.9;color:var(--text-3)}
.f-nav h4{font-size:13px;font-weight:600;color:var(--text-1);margin-bottom:16px}
.f-nav a{display:block;font-size:14px;color:var(--text-2);text-decoration:none;margin-bottom:11px;transition:color .25s}
.f-nav a:hover{color:var(--brand)}
.f-bottom{margin-top:44px;padding-top:22px;border-top:1px solid var(--border-subtle);font-size:13px;color:var(--text-3)}

/* ---------- 关于页 ---------- */
.about{position:relative;z-index:1;max-width:660px;margin:0 auto;padding:158px 24px 0;text-align:center}
.about .label{font-size:13px;letter-spacing:.22em;color:var(--text-3);text-indent:.22em}
.lead{margin-top:22px;font-size:22px;font-weight:500;letter-spacing:-.01em}
.about p.para{margin-top:18px;font-size:16px;line-height:1.9;color:var(--text-2);text-wrap:pretty}
.game{position:relative;z-index:1;margin:58px auto 110px;max-width:430px;padding:0 24px;scroll-margin-top:96px}
.game-card{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--r-card);box-shadow:var(--card-shadow);padding:20px;transition:box-shadow .45s}
.game-head{display:flex;justify-content:center;margin-bottom:14px}
.score-pill{font-size:13px;color:var(--text-2);border:1px solid var(--border-subtle);border-radius:100px;padding:6px 16px;background:var(--bg-surface)}
.score-pill b{color:var(--text-1);font-weight:600;margin-left:4px;font-variant-numeric:tabular-nums}
.board{position:relative;aspect-ratio:1/1;border-radius:16px;overflow:hidden;border:1px solid var(--border-subtle)}
.board canvas{width:100%;height:100%;display:block;touch-action:none}
.overlay{
  position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;
  background:var(--overlay-bg);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  opacity:0;pointer-events:none;transition:opacity .35s var(--ease);
}
.overlay.show{opacity:1;pointer-events:auto}
.ov-title{font-size:20px;font-weight:500}
.ov-sub{font-size:13px;color:var(--text-3)}
.hint{margin-top:16px;text-align:center;font-size:13px;color:var(--text-3)}

/* ---------- 入场动效 ---------- */
@keyframes fx{from{opacity:0;transform:translateY(18px);filter:blur(8px)}to{opacity:1;transform:none;filter:none}}
.fx{animation:fx 1.05s var(--ease) both;animation-delay:var(--d,0s)}
html.js [data-io]{opacity:0;transform:translateY(18px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
html.js [data-io].fx{opacity:1;transform:none}

/* ---------- 可访问性 ---------- */
:focus-visible{outline:2px solid var(--brand);outline-offset:3px;border-radius:6px}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .fx{animation:none}
  .slogan .ch{animation:none;opacity:1;filter:none;transform:none}
  .kicker .star{animation:none}
  .cards-inner .card:nth-child(2){transition-delay:0s}
  .spot{display:none}
  html.js [data-io]{opacity:1;transform:none;transition:none}
  .btn,.card,.nav-link,.theme-toggle,.overlay{transition:none}
}

/* ---------- 响应式 ---------- */
@media (max-width:768px){
  .nav-inner{height:56px;padding:0 16px}
  .brand-name{font-size:15px}
  .hero{padding:120px 18px 70px}
  .cta{margin-top:26px;gap:10px}
  .btn{height:42px;padding:0 18px;font-size:14px}
  .cards{padding:6px 18px 80px}
  .cards-inner{grid-template-columns:1fr;gap:14px}
  .footer-inner{padding:40px 20px 30px}
  .f-top{gap:30px}
  .f-bottom{margin-top:34px}
  .about{padding:126px 20px 0}
  .lead{font-size:20px}
  .game{margin:48px auto 84px}
}
@media (max-width:480px){
  .slogan{font-size:22px;letter-spacing:.13em}
  .slogan .line{padding-left:.13em}
}