:root{
  --bg:#eceff3; --card:#ffffff; --ink:#1f2633; --muted:#6b7482; --line:#d8dde5;
  --blue:#2a6fdb; --blue-l:#e6efff; --blue-d:#1b4fa6;
  --red:#d9473a; --red-l:#fff0ee; --red-d:#a8322a;
  --font:'Noto Sans TC','PingFang TC','Microsoft JhengHei',sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{font-family:var(--font);color:var(--ink);background:var(--bg);-webkit-tap-highlight-color:transparent}
button{font-family:inherit;cursor:pointer;border:0;background:none;color:inherit}
button:focus-visible,input:focus-visible{outline:3px solid var(--blue);outline-offset:2px}
.topbar{position:fixed;top:0;left:0;right:0;height:52px;background:#0b0d12;color:#fff;display:flex;align-items:center;justify-content:space-between;padding:0 16px;z-index:20}
.brand{display:flex;align-items:center;gap:10px;font-weight:900;font-size:16px;letter-spacing:.04em}
.icon-btn{width:40px;height:40px;border-radius:999px;display:grid;place-items:center;color:#fff;border:1px solid rgba(255,255,255,.25)}
.icon-btn.muted .wave{display:none}.icon-btn.muted .x{display:inline!important}

.screen{display:none}
.screen.active{display:block}

/* ---------- select ---------- */
#scr-select{padding:76px 16px 48px;max-width:1040px;margin:0 auto}
.logo{text-align:center;font-size:clamp(40px,8vw,64px);font-weight:900;letter-spacing:.02em;line-height:1.1}
.logo .b{color:var(--blue)} .logo .r{color:var(--red);font-family:'LXGW WenKai TC',serif} .logo .k{font-family:'Noto Serif TC',serif}
.lead{text-align:center;color:var(--muted);margin:10px 0 24px;font-size:15px}
.cards{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.card{background:var(--card);border-radius:16px;border:1px solid var(--line);border-top:5px solid var(--blue);padding:16px 18px 18px;display:flex;flex-direction:column;gap:12px}
.card.p2{border-top-color:var(--red);background:linear-gradient(#fff, #fffafa)}
.card-head{display:flex;align-items:center;justify-content:space-between;gap:8px;min-height:32px}
.who{font-weight:700;font-size:15px;color:var(--blue)}
.p2 .who{color:var(--red)}
.hint{font-size:13px;color:var(--muted)}
.glyph-row{display:grid;grid-template-columns:1fr;gap:12px;align-items:center;justify-items:center}
.pad-wrap{position:relative;width:95%;aspect-ratio:1;justify-self:center;border-radius:12px;background:#fff;border:2px solid var(--line);overflow:hidden;touch-action:none}
.p1 .pad-wrap{border-color:#bcd1f5} .p2 .pad-wrap{border-color:#f2c3bd}
.pad{position:absolute;inset:0;width:100%;height:100%;touch-action:none;cursor:crosshair}
.pad-ph{position:absolute;inset:0;display:grid;place-items:center;font-weight:900;font-size:clamp(40px,8vw,64px);color:rgba(31,38,51,.07);pointer-events:none}
.cpu-glyph{width:100%;max-width:300px;aspect-ratio:1;justify-self:center;display:grid;place-items:center;font-size:clamp(120px,22vw,210px);line-height:1;color:var(--red);font-weight:700}
.stats{display:flex;flex-direction:column;gap:9px;width:min(260px,90%);align-self:center}
.stat{display:flex;flex-direction:column;gap:5px;font-size:13px;color:var(--muted)}
.stat .track{height:9px;background:#dde3ea;border-radius:999px;overflow:hidden}
.stat .fill{height:100%;border-radius:999px;background:var(--blue);transition:width .3s ease}
.p2 .stat .fill{background:var(--red)}
.seg4,.seg3,.seg2{display:grid;border:1px solid #c9d0da;border-radius:10px;overflow:hidden;background:#f6f8fa}
.seg4{grid-template-columns:repeat(4,1fr)} .seg3{grid-template-columns:repeat(3,1fr)} .seg2{grid-template-columns:repeat(2,1fr);border-radius:999px}
.seg4 button,.seg3 button,.seg2 button{padding:11px 4px;font-size:14px;font-weight:500;border-left:1px solid #c9d0da}
.seg2 button{padding:5px 14px;font-size:13px}
.seg4 button:first-child,.seg3 button:first-child,.seg2 button:first-child{border-left:0}
.p1 .seg4 button.on{background:var(--blue-l);color:var(--blue);font-weight:700}
.p2 .seg4 button.on,.p2 .seg3 button.on,.seg2 button.on{background:var(--red-l);color:var(--red);font-weight:700}
#human-panel .seg4 button.on{background:var(--red-l);color:var(--red)}
.pad-tools{display:flex;gap:8px;justify-content:flex-end}
.tool{border:1px solid #c9d0da;border-radius:10px;padding:8px 14px;font-size:14px;background:#fff}
.tool:active{background:#eef1f5}
.lbl{font-size:13px;color:var(--muted);margin-bottom:-4px}
.char-row{display:grid;grid-template-columns:1fr 46px;gap:8px}
#cpu-char{font:inherit;font-size:18px;padding:9px 12px;border:1px solid #c9d0da;border-radius:10px;color:var(--red);min-width:0}
.dice{display:grid;place-items:center;padding:0}

.modes{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:14px;margin-top:20px}
.mode{display:flex;flex-direction:column;align-items:center;gap:4px;padding:16px;border-radius:14px;background:#fff;border:1px solid var(--line);box-shadow:0 3px 0 #cfd5de;transition:transform .1s}
.mode:active{transform:translateY(2px);box-shadow:0 1px 0 #cfd5de}
.mode b{font-size:20px;font-weight:900}
.mode small{font-size:12px;color:var(--muted)}
.mode.main{background:var(--blue);color:#fff;border-color:var(--blue-d);box-shadow:0 3px 0 var(--blue-d)}
.mode.main small{color:rgba(255,255,255,.8)}
.mode:disabled{opacity:.45;pointer-events:none}
.warn{min-height:1.4em;text-align:center;color:var(--red);font-size:14px;margin-top:10px}
.howto{margin-top:8px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 16px;font-size:14px;line-height:1.75}
.howto summary{cursor:pointer;font-weight:700}
.howto ul{padding-left:20px;margin-top:6px;color:#3b4350}

/* ---------- battle ---------- */
#scr-battle{position:fixed;inset:52px 0 0 0;background:#c9ccd1;overflow:hidden}
#stage{position:absolute;inset:0}
#stage canvas{display:block;touch-action:none}
.hud{position:absolute;top:12px;left:50%;transform:translateX(-50%);width:min(640px,94vw);background:rgba(255,255,255,.94);border-radius:14px;padding:8px 14px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:10px;box-shadow:0 4px 18px rgba(0,0,0,.08);z-index:5}
.hud-side{display:flex;align-items:center;gap:8px;min-width:0}
.hud-side.p2{justify-content:flex-end}
.hud-who{font-size:12px;font-weight:700;white-space:nowrap}
.p1 .hud-who{color:var(--blue)} .p2 .hud-who{color:var(--red)}
.hud-glyph{width:34px;height:34px;object-fit:contain}
.bar{flex:1;height:8px;border-radius:999px;background:#e3e7ec;overflow:hidden;position:relative;min-width:40px}
.bar i{position:absolute;top:0;bottom:0;width:100%;border-radius:999px}
.p1 .bar i{left:0;background:var(--blue)} .p2 .bar i{right:0;background:var(--red)}
.hud-mid{display:flex;flex-direction:column;align-items:center;font-size:13px;color:var(--muted);font-weight:500;min-width:70px;text-align:center;font-variant-numeric:tabular-nums}
.spin-btn{position:absolute;z-index:6;left:50%;bottom:max(76px,12dvh);transform:translateX(-50%);width:68px;height:68px;display:grid;place-items:center;border-radius:50%;padding:0;background:#d7dce1;border:1px solid #abb4be;color:#46515e;box-shadow:0 3px 0 #a4aeb8;touch-action:manipulation}
.spin-btn:hover{background:#cbd2d9}
.spin-btn:active{transform:translate(-50%,1px);box-shadow:0 2px 0 #a4aeb8}
.spin-btn svg{position:absolute;inset:8px;width:50px;height:50px;fill:none;stroke:currentColor;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round;pointer-events:none}
.spin-btn.is-clockwise svg{transform:scaleX(-1)}
.spin-btn span{font-weight:700;font-size:19px;line-height:1;pointer-events:none}
.spin-btn.top{top:112px;bottom:auto}
.spin-btn[hidden]{display:none}
.round-intro{position:absolute;z-index:7;top:27%;left:50%;pointer-events:none;opacity:0;transform:translate(-50%,-50%);color:#17202a;font-weight:900;font-size:clamp(42px,9vw,88px);line-height:1.1;letter-spacing:-.03em;white-space:nowrap;text-shadow:0 2px 0 #fff,0 0 16px rgba(255,255,255,.72)}
.round-intro.is-visible{animation:round-intro 1.25s cubic-bezier(.16,.8,.25,1) both}
@keyframes round-intro{0%{opacity:0;transform:translate(-50%,-45%) scale(.82)}14%,58%{opacity:1;transform:translate(-50%,-50%) scale(1)}100%{opacity:0;transform:translate(-50%,-55%) scale(1.08)}}
#hud-clock{display:block;font-size:15px;font-weight:700;color:var(--ink);font-variant-numeric:tabular-nums;margin-top:1px}
#hud-clock[hidden]{display:none}
.tip{position:absolute;left:50%;bottom:20px;transition:opacity .4s;transform:translateX(-50%);background:rgba(31,38,51,.82);color:#fff;font-size:14px;padding:8px 16px;border-radius:999px;z-index:6;white-space:nowrap;pointer-events:none}
.tip[hidden]{display:none}
.tip.fade{opacity:0}
.tip b{font-weight:700;color:#9cc2ff}
@media (hover:none){.tip .kb{display:none}}
.streak-tag{position:absolute;right:14px;top:78px;z-index:5;background:#fff;border-radius:10px;padding:6px 12px;font-size:13px;font-weight:700;color:var(--blue);box-shadow:0 2px 8px rgba(0,0,0,.08)}
.streak-tag:empty{display:none}
.callout{position:absolute;left:0;right:0;top:36%;text-align:center;font-size:clamp(36px,8vw,64px);font-weight:900;color:var(--ink);pointer-events:none;opacity:0;z-index:6;text-shadow:0 2px 0 #fff,0 0 18px rgba(255,255,255,.9)}
.callout.show{animation:co 1s ease both}
@keyframes co{0%{opacity:0;transform:scale(.6)}18%{opacity:1;transform:scale(1.06)}75%{opacity:1;transform:scale(1)}100%{opacity:0}}
.back-btn{position:absolute;left:14px;bottom:16px;width:44px;height:44px;border-radius:50%;background:rgba(255,255,255,.9);border:1px solid #c9d0da;font-size:20px;z-index:6}
.result{position:absolute;inset:0;z-index:8;display:flex;flex-direction:column;align-items:center;justify-content:space-between;padding:8vh 16px 6vh;pointer-events:none}
.result[hidden]{display:none}
.win-line{display:flex;align-items:center;gap:10px;font-size:clamp(44px,10vw,80px);font-weight:900;color:var(--blue);animation:co2 .5s cubic-bezier(.2,1.5,.4,1) both;text-shadow:0 3px 0 #fff}
.win-line.red{color:var(--red)} .win-line.draw{color:var(--ink)}
.win-line img{height:1.15em;width:1.15em;object-fit:contain}
@keyframes co2{from{transform:scale(.4);opacity:0}}
#win-sub{background:rgba(255,255,255,.92);border-radius:999px;padding:6px 16px;font-size:15px;margin-top:8px}
#win-sub:empty{display:none}
.result>div:first-child,.result p{pointer-events:none}
.result-btns{display:flex;gap:12px;pointer-events:auto;margin-top:auto}
.rbtn{min-width:150px;padding:14px 22px;border-radius:10px;font-size:16px;font-weight:700}
.rbtn.primary{background:var(--blue);color:#fff;box-shadow:0 3px 0 var(--blue-d)}
.rbtn.ghost{background:#fff;border:1px solid #c9d0da}

@media (max-width:760px){
  .cards{grid-template-columns:1fr}
  .modes{grid-template-columns:1fr}
  .tip{font-size:13px;bottom:16px;white-space:normal;text-align:center;width:max-content;max-width:calc(100vw - 132px);border-radius:14px;line-height:1.45}
  .tip .kb{display:none}
  .spin-btn{bottom:max(72px,11dvh);width:60px;height:60px}.spin-btn svg{inset:6px;width:46px;height:46px}.spin-btn span{font-size:17px}
  .spin-btn.top{top:94px}
  .rbtn{min-width:130px}
}

/* 手機：寫字格貼近屏幕 95% 寬、保持正方形 */
@media (max-width:760px){
  #scr-select{padding-left:4px;padding-right:4px}
  .card{padding-left:4px;padding-right:4px}
  .pad-wrap{width:min(85vw,100%)}
}
/* 舊瀏覽器唔支援 aspect-ratio 嘅後備：用 padding-bottom 整正方形 */
@supports not (aspect-ratio:1/1){ .pad-wrap{height:0;padding-bottom:100%} }

.mode.pvp{border-color:#f2c3bd;box-shadow:0 3px 0 #e8a69e}
.mode.pvp b{color:var(--red)}
.ready-tag{font-size:11px;font-weight:700;color:#fff;background:#2fa36b;border-radius:999px;padding:2px 7px;white-space:nowrap}
.ready-tag[hidden]{display:none}
.tip2{top:70px;bottom:auto;transform:translateX(-50%) rotate(180deg)}
.spin-btn.top.flip svg{transform:rotate(180deg)}
.spin-btn.top.flip.is-clockwise svg{transform:rotate(180deg) scaleX(-1)}
.spin-btn.top.flip span{transform:rotate(180deg)}
.score-tag{position:absolute;left:14px;top:78px;z-index:5;background:#fff;border-radius:10px;padding:6px 12px;font-size:14px;font-weight:900;box-shadow:0 2px 8px rgba(0,0,0,.08)}
.score-tag .b{color:var(--blue)} .score-tag .r{color:var(--red)}
.score-tag[hidden]{display:none}
.hud-mid.countdown #hud-status{color:var(--red);font-weight:700}
@media (max-width:760px){.tip2{top:160px;max-width:calc(100vw - 40px)}}
.hud-side{position:relative}
.ready-tag{position:absolute;top:calc(100% + 10px);}
.hud-side.p1 .ready-tag{left:0}.hud-side.p2 .ready-tag{right:0}
@media (min-width:761px){.spin-btn.top{left:calc(50% + 120px);top:118px}}
@media (max-width:760px){.ready-tag{position:static}.hud-side.ready .hud-who{display:none}}
.hud-mid{white-space:nowrap}@media (max-width:760px){.hud{gap:6px;padding:8px 10px}.hud-mid{font-size:12px;min-width:0}}

/* ---------- footer / contact ---------- */
.site-footer{margin-top:28px;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px 22px 0}
.footer-inner{display:grid;grid-template-columns:1fr 1fr;gap:24px;padding-bottom:18px}
.site-footer h2{font-size:16px;font-weight:900;margin-bottom:10px;color:var(--ink)}
.about .team{font-size:15px;font-weight:500;color:var(--muted);line-height:1.8}
.about .team-link{color:var(--blue);font-weight:900;text-decoration:none}
.about .team-link:hover{text-decoration:underline}
.contact-desc{font-size:13px;color:var(--muted);margin-bottom:10px}
.fb-open{background:var(--blue);color:#fff;border-radius:10px;padding:12px 18px;font-size:15px;font-weight:700;box-shadow:0 3px 0 var(--blue-d)}
.fb-open:active{transform:translateY(2px);box-shadow:0 1px 0 var(--blue-d)}
.copyright{text-align:center;font-size:12px;color:var(--muted);border-top:1px solid var(--line);padding:14px 0}
@media (max-width:760px){.footer-inner{grid-template-columns:1fr;gap:20px}}

/* ---------- contact modal ---------- */
.modal-overlay{position:fixed;inset:0;z-index:50;background:rgba(11,13,18,.55);display:grid;place-items:center;padding:16px}
.modal-overlay[hidden]{display:none}
.modal-card{background:var(--card);border-radius:16px;border:1px solid var(--line);padding:22px;width:min(480px,100%);position:relative;box-shadow:0 18px 50px rgba(0,0,0,.28);max-height:calc(100dvh - 40px);overflow:auto}
.modal-card h2{font-size:18px;font-weight:900;margin-bottom:6px;color:var(--ink)}
.modal-close{position:absolute;top:12px;right:12px;width:34px;height:34px;border-radius:50%;display:grid;place-items:center;font-size:16px;line-height:1;color:var(--muted);background:#f2f4f7;border:1px solid var(--line)}
.modal-close:active{background:#e6eaf0}
#feedback-form{display:flex;flex-direction:column;gap:8px;margin-top:14px}
#feedback-form label{font-size:13px;color:var(--muted)}
#feedback-form input,#feedback-form textarea{font:inherit;font-size:15px;padding:10px 12px;border:1px solid #c9d0da;border-radius:10px;background:#fff;color:var(--ink);width:100%;resize:vertical}
#feedback-form textarea{min-height:88px}
.fb-submit{background:var(--blue);color:#fff;border-radius:10px;padding:12px 16px;font-size:15px;font-weight:700;box-shadow:0 3px 0 var(--blue-d);align-self:flex-start}
.fb-submit:active{transform:translateY(2px);box-shadow:0 1px 0 var(--blue-d)}
.fb-submit:disabled{opacity:.55;cursor:wait}
.fb-status{font-size:13px;font-weight:700;margin-top:4px}
.fb-status.ok{color:#2fa36b}.fb-status.err{color:var(--red)}.fb-status.sending{color:var(--muted)}