:root{--bg: #faf8ef;--text: #776e65;--text-secondary: #8f7a66;--grid-bg: #bbada0;--cell-bg: #cdc1b4;--score-bg: #bbada0;--score-text: #fff;--btn-primary-bg: #8f7a66;--btn-primary-text: #f9f6f2;--btn-secondary-bg: #bbada0;--btn-secondary-text: #f9f6f2;--overlay-bg: rgba(250, 248, 239, .85);--hint-color: #bbada0;--hero-gradient-start: #f0f5ee;--accent-green: #6ab04c;--footer-border: rgba(187, 173, 160, .3)}@media(prefers-color-scheme:dark){:root{--bg: #1a1a2e;--text: #e0d6c8;--text-secondary: #c4b8a8;--grid-bg: #3d3a50;--cell-bg: #2d2b3d;--score-bg: #3d3a50;--score-text: #e0d6c8;--btn-primary-bg: #6b5a4e;--btn-primary-text: #f0ebe4;--btn-secondary-bg: #3d3a50;--btn-secondary-text: #e0d6c8;--overlay-bg: rgba(26, 26, 46, .9);--hint-color: #5a5670;--hero-gradient-start: #1a2a1e;--footer-border: rgba(61, 58, 80, .5)}}@media(prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}*{margin:0;padding:0;box-sizing:border-box}html,body{width:100%;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text)}.btn{padding:10px 12px;border:none;border-radius:6px;font-size:.85rem;font-weight:600;cursor:pointer;transition:opacity .15s}.btn:active{opacity:.8}.btn:disabled{opacity:.4;cursor:not-allowed}.btn:focus-visible{outline:2px solid var(--text);outline-offset:2px}.btn-primary{background:var(--btn-primary-bg);color:var(--btn-primary-text)}.btn-secondary{background:var(--btn-secondary-bg);color:var(--btn-secondary-text)}.overlay{display:flex;position:fixed;inset:0;background:var(--overlay-bg);z-index:100;justify-content:center;align-items:center;flex-direction:column;visibility:hidden;opacity:0;transition:opacity .25s ease,visibility .25s ease}.overlay.active{visibility:visible;opacity:1}.overlay-content{text-align:center;padding:24px;transform:translateY(20px);transition:transform .25s ease}.overlay.active .overlay-content{transform:translateY(0)}.overlay-title{font-size:2.5rem;font-weight:800;margin-bottom:8px}.overlay-title.win{color:#edc22e}@media(prefers-reduced-motion:no-preference){.overlay-title.win{animation:win-glow 1.5s ease-in-out infinite}}@keyframes win-glow{0%,to{text-shadow:0 0 10px rgba(237,194,46,.3)}50%{text-shadow:0 0 25px rgba(237,194,46,.7),0 0 50px rgba(237,194,46,.3)}}.overlay-title.lose{color:var(--text)}.overlay-score{font-size:1.2rem;margin-bottom:20px;color:var(--text-secondary)}.overlay .btn{min-width:160px;padding:14px 24px;font-size:1rem;margin:4px}.welcome-text{font-size:1rem;line-height:1.5;margin:12px 0;color:var(--text);max-width:320px}#confetti-container{position:fixed;top:0;left:0;width:100%;height:100%;pointer-events:none;overflow:hidden;z-index:101}.confetti-piece{position:absolute;top:-20px;width:10px;height:10px;opacity:0}@media(prefers-reduced-motion:no-preference){.confetti-piece{animation:confetti-fall 3s ease-out forwards}}@keyframes confetti-fall{0%{opacity:1;transform:translateY(0) rotate(0)}to{opacity:0;transform:translateY(100vh) rotate(720deg)}}.copied-toast{position:fixed;bottom:80px;left:50%;transform:translate(-50%) translateY(20px);background:var(--btn-primary-bg);color:var(--btn-primary-text);padding:8px 20px;border-radius:20px;font-size:.85rem;font-weight:600;opacity:0;transition:opacity .2s,transform .2s;z-index:200;pointer-events:none}.copied-toast.visible{opacity:1;transform:translate(-50%) translateY(0)}.portal-nav{display:flex;align-items:center;justify-content:space-between;padding:8px 16px;background:var(--score-bg);color:var(--score-text);font-size:.85rem}.portal-nav-brand{font-weight:700;color:var(--score-text);text-decoration:none}.portal-nav-logo{height:20px;width:20px;vertical-align:middle;margin-right:6px;border-radius:4px}.portal-nav-links{display:flex;gap:12px}.portal-nav-link{color:var(--score-text);text-decoration:none;opacity:.7;transition:opacity .15s}.portal-nav-link:hover,.portal-nav-link.active{opacity:1}.portal-nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:4px;flex-direction:column;justify-content:center;gap:4px}.portal-nav-toggle span{display:block;width:20px;height:2px;background:var(--score-text);border-radius:1px;transition:transform .2s,opacity .2s}@media(max-width:600px){.portal-nav{flex-wrap:wrap}.portal-nav-toggle{display:flex}.portal-nav-menu{display:none;width:100%;flex-direction:column;gap:4px;padding-top:8px}.portal-nav.open .portal-nav-menu{display:flex}.portal-nav.open .portal-nav-toggle span:nth-child(1){transform:translateY(6px) rotate(45deg)}.portal-nav.open .portal-nav-toggle span:nth-child(2){opacity:0}.portal-nav.open .portal-nav-toggle span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}.portal-nav-links{flex-direction:column;gap:0}.portal-nav-link{display:block;padding:10px 8px;min-height:44px;line-height:24px}.locale-picker{align-self:flex-start;margin-top:4px;margin-bottom:4px}}@media(prefers-reduced-motion:reduce){.overlay{transition:none}.overlay-content{transition:none;transform:none}.copied-toast,.portal-nav-toggle span{transition:none}}.locale-picker{background:transparent;color:var(--score-text);border:1px solid var(--score-text);border-radius:4px;padding:4px 8px;font-size:.8rem;cursor:pointer;opacity:.85;transition:opacity .15s}.locale-picker:hover,.locale-picker:focus{opacity:1;outline:none}:lang(zh){font-family:-apple-system,PingFang SC,Microsoft YaHei,sans-serif}