@import url("https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;600;700&family=Syne:wght@600;700&display=swap");:root{--felt-deep:#2a3124;--felt:#456038;--green:#7a9a64;--green-dark:#456038;--gold:#c9a227;--gold-soft:#e4c878;--ink:#0e1613;--muted:#5a6b62;--bg:#f0f4f2;--card:#ffffff;--border:#d0ddd6;--square-dark:#769656;--square-light:#eeeed2;--radius:16px;--max:1140px;--sticky-h:58px;--ease:cubic-bezier(0.22,1,0.36,1);--font:"Outfit","PingFang SC","Noto Sans SC","Noto Sans TC",system-ui,sans-serif;--font-display:"Syne","Outfit","PingFang SC",system-ui,sans-serif;--shadow-sm:0 2px 8px rgb(3 10 8/6%);--shadow-md:0 12px 40px rgb(3 10 8/10%)}*{box-sizing:border-box}body,html{margin:0}body{font-family:var(--font);color:var(--ink);background:radial-gradient(ellipse 120% 60% at 50% -10%,rgb(93 124 74/9%),transparent 55%),var(--bg);line-height:1.6;padding-bottom:calc(var(--sticky-h) + env(safe-area-inset-bottom, 0px));-webkit-font-smoothing:antialiased}a{color:var(--green-dark);text-decoration:none}.container{width:min(var(--max),calc(100% - 40px));margin:0 auto}.display,h1,h2{font-family:var(--font-display)}.site-header{position:-webkit-sticky;position:sticky;top:0;z-index:50;height:58px;background:rgb(255 255 255/94%);-webkit-backdrop-filter:blur(14px) saturate(1.2);backdrop-filter:blur(14px) saturate(1.2);border-bottom:1px solid var(--border)}.header-inner,.site-header{display:flex;align-items:center}.header-inner{justify-content:space-between;gap:16px;width:min(var(--max),calc(100% - 40px));margin:0 auto}.brand-link{display:flex;align-items:center;gap:10px;font-weight:700;color:#3d5230}.brand-mark{width:32px;height:32px;flex:0 0 32px;border-radius:9px;box-shadow:0 5px 14px rgb(69 96 56/18%)}.nav{display:flex;gap:18px;align-items:center;font-size:14px}.lang-switch{display:flex;gap:8px;font-size:12px;color:var(--muted)}.menu-btn{display:none;background:#456038;color:#fff;border:0;border-radius:10px;width:40px;height:40px}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:10px 18px;border-radius:999px;font-weight:600;border:1px solid transparent;transition:.15s var(--ease)}.btn:active{transform:scale(.98)}.btn-primary{background:linear-gradient(145deg,var(--green),var(--green-dark));color:#fff;box-shadow:0 8px 24px rgb(69 96 56/28%)}.btn-primary:hover{color:#fff}.btn-gold{background:linear-gradient(145deg,var(--gold-soft),var(--gold));color:#1a1408;box-shadow:0 8px 22px rgb(201 168 74/28%)}.btn-ghost{background:rgb(255 255 255/8%);color:#fff;border-color:rgb(255 255 255/35%)}.btn-secondary{background:#fff;border-color:var(--border);color:var(--ink)}.btn-disabled{opacity:.55;cursor:not-allowed;box-shadow:none}.hero{position:relative;color:#fff;overflow:hidden;background:#2a3124;padding:72px 0 56px}.hero-bg{position:absolute;inset:0;background:radial-gradient(ellipse 110% 80% at 50% 0,rgb(122 154 100/28%),transparent 55%),linear-gradient(165deg,#2a3124,#456038 52%,#35462c)}.hero-inner{position:relative;display:grid;grid-template-columns:1.1fr .9fr;grid-gap:40px;gap:40px;align-items:center}.hero h1{font-size:clamp(32px,5vw,52px);font-weight:500;line-height:1.15;margin:12px 0;color:#e8f5e9}.hero .lead{font-size:18px;color:rgb(232 245 233/80%)}.hero .note{color:var(--gold-soft);font-size:14px}.cta-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}.mini-board{width:min(100%,360px);aspect-ratio:1;border-radius:18px;overflow:hidden;box-shadow:0 24px 64px rgb(0 0 0/35%);border:10px solid #312e2b;display:grid;grid-template-columns:repeat(8,1fr);animation:floaty 5s ease-in-out infinite}@keyframes floaty{50%{transform:translateY(-6px) rotate(-1deg)}}.sq{aspect-ratio:1;display:flex;align-items:center;justify-content:center;font-size:22px}.sq.light{background:var(--square-light)}.sq.dark{background:var(--square-dark)}.section{padding:40px 0}.section-soft{background:linear-gradient(180deg,transparent,rgb(13 79 60/4%))}.grid-4{display:grid;grid-template-columns:repeat(4,1fr);grid-gap:16px;gap:16px}.pillar{display:flex;flex-direction:column;background:#fff;border-radius:16px;padding:20px;box-shadow:var(--shadow-sm);transition:transform .25s var(--ease),box-shadow .25s var(--ease)}.pillar:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.pillar-link{margin-top:auto;color:var(--green-dark);font-weight:600}.section-heading{max-width:720px;margin-bottom:22px}.section-heading h2{margin-bottom:6px}.section-heading p{margin:0;color:var(--muted);font-size:17px}.guide-grid{display:grid;grid-template-columns:repeat(4,1fr);grid-gap:14px;gap:14px}.guide-card{position:relative;min-height:220px;padding:22px;border-radius:18px;background:linear-gradient(155deg,#fff,#f7fbf8);border:1px solid var(--border);box-shadow:var(--shadow-sm)}.guide-card h3{margin:24px 0 8px;font-size:19px}.guide-card p{color:var(--muted);margin:0 0 18px}.guide-card strong{color:var(--green-dark);font-size:14px}.guide-index{position:absolute;top:18px;right:20px;font-family:var(--font-display);color:rgb(13 79 60/24%);font-size:28px;font-weight:700}.legal-page{max-width:820px}.legal-page>h1{margin-bottom:4px;font-size:clamp(30px,5vw,46px)}.legal-updated{color:var(--muted);font-size:14px}.legal-intro{margin:26px 0;padding:20px 22px;background:#fff;border-left:4px solid var(--green);border-radius:0 14px 14px 0;font-size:17px}.legal-page section{padding:18px 0;border-bottom:1px solid var(--border)}.legal-page section h2{margin:0 0 8px;font-size:20px}.legal-page section p{margin:0;color:#42534a}.article-list{display:grid;grid-gap:12px;gap:12px}.article-item{display:block;padding:16px 18px;background:#fff;border-radius:12px;border:1px solid var(--border);transition:transform .2s var(--ease),box-shadow .2s var(--ease)}.article-item:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.article-item p{margin:6px 0 0;color:var(--muted)}.download-sec{background:linear-gradient(135deg,#5d7c4a,#456038 55%,#2a3124);color:#fff;border-radius:20px;padding:32px 28px;margin:12px 0 32px}.faq details{background:#fff;border-radius:12px;border:1px solid #e2ebe6;padding:12px 16px;margin-bottom:10px}.faq summary{cursor:pointer;font-weight:600}.site-footer{background:linear-gradient(180deg,#2a3124,#171b14);color:#9bb5a8;border-top:1px solid rgb(201 168 74/18%);padding:36px 0 88px}.site-footer a{color:var(--gold-soft)}.footer-inner{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}.footer-brand{display:inline-flex;align-items:center;gap:9px}.footer-brand img{border-radius:8px}.sticky-bar{left:0;right:0;bottom:0;z-index:55;height:var(--sticky-h);align-items:center;justify-content:center;gap:10px;background:rgb(6 20 16/96%);border-top:1px solid rgb(201 168 74/22%);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);padding-bottom:env(safe-area-inset-bottom,0)}.drawer,.sticky-bar{position:fixed;display:flex}.drawer{inset:0 0 0 auto;width:min(82vw,320px);background:#fff;z-index:70;padding:24px 18px;box-shadow:-12px 0 40px rgb(0 0 0/18%);flex-direction:column;gap:14px}.scrim{position:fixed;inset:0;background:rgb(0 0 0/35%);z-index:60}.play-wrap{display:grid;grid-template-columns:minmax(0,1fr) 240px;grid-gap:24px;gap:24px;align-items:start;padding:32px 0 64px}.board-shell{width:min(100%,480px);min-width:0}.board-grid{width:100%;aspect-ratio:1/1;display:grid;grid-template-columns:repeat(8,minmax(0,1fr));grid-template-rows:repeat(8,minmax(0,1fr));border:clamp(6px,2.5vw,12px) solid #312e2b;border-radius:12px;overflow:hidden;contain:layout paint size;touch-action:manipulation}.cell{min-width:0;min-height:0;width:100%;height:100%;padding:0;margin:0;-webkit-appearance:none;-moz-appearance:none;appearance:none;border:0;border-radius:0;line-height:1;display:flex;align-items:center;justify-content:center;background:var(--square-light);color:#2d2a27;font-family:Georgia,Times New Roman,serif;font-size:clamp(24px,7vw,38px);cursor:pointer;-webkit-user-select:none;-moz-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent;position:relative}.cell.dark{background:var(--square-dark)}.cell.light{background:var(--square-light)}.cell:disabled{opacity:1;cursor:wait}.cell.last-move{background:#f0d95a}.cell.dark.last-move{background:#b6a338}.cell.sel{box-shadow:inset 0 0 0 4px #f5c542;z-index:2}.cell.legal:after{content:"";position:absolute;width:24%;aspect-ratio:1;border-radius:50%;background:rgb(13 79 60/42%);pointer-events:none}.cell.legal-capture:after{width:78%;background:transparent;border:clamp(3px,.8vw,6px) solid rgb(13 79 60/48%)}.cell.in-check{background:#df6b64;box-shadow:inset 0 0 0 4px #a51f19;animation:check-pulse 1.1s ease-in-out infinite alternate}.cell:focus-visible{outline:3px solid #fff;outline-offset:-5px;z-index:3}@keyframes check-pulse{0%{filter:saturate(1)}to{filter:saturate(1.45) brightness(1.05)}}.play-panel{position:-webkit-sticky;position:sticky;top:82px;box-shadow:var(--shadow-sm)}.play-sides{display:grid;grid-gap:8px;gap:8px}.play-sides p{display:flex;align-items:center;gap:8px;margin:0;font-weight:600}.side-dot{width:10px;height:10px;border-radius:50%;box-shadow:0 0 0 3px rgb(13 79 60/8%)}.side-you{background:#f5f2e5;border:1px solid #8a8175}.side-ai{background:#292724}.play-status{min-height:26px;margin:18px 0;color:var(--green-dark);font-weight:700}.last-move-label{margin:-10px 0 18px;color:var(--muted);font-size:14px;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.play-new{width:100%}.gate{background:#fff;border-radius:var(--radius);padding:24px;border:1px solid var(--border)}.empty-download{max-width:680px;padding:clamp(24px,5vw,42px);background:linear-gradient(145deg,#fff,#f1f7f3)}.empty-download h1,.empty-download h2,.empty-download h3{margin-top:0}.empty-download p{color:var(--muted);margin-bottom:22px}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px}@media (max-width:860px){.grid-4,.guide-grid,.hero-inner,.play-wrap{grid-template-columns:1fr}.nav{display:none}.menu-btn{display:inline-flex;align-items:center;justify-content:center}.play-wrap{gap:14px;padding:18px 0 36px}.board-shell{width:100%}.play-panel{position:static;display:grid;grid-template-columns:1fr auto;grid-gap:12px 16px;gap:12px 16px;align-items:center;padding:16px}.play-sides{grid-template-columns:repeat(2,auto);justify-content:start;gap:16px}.play-status{min-height:24px;margin:0;grid-column:1}.last-move-label{margin:-8px 0 0;grid-column:1}.play-new{width:auto;min-height:42px;grid-column:2;grid-row:1/span 2}}@media (max-width:520px){.container{width:min(100% - 24px,var(--max))}.header-inner{width:calc(100% - 24px)}.brand-link{max-width:calc(100vw - 164px);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.play-wrap{margin-inline:-2px}.board-grid{border-radius:9px}.play-panel{border-radius:14px}}@media (min-width:900px){.sticky-bar{display:none}body{padding-bottom:0}.site-footer{padding-bottom:36px}}