:root{color-scheme:light;font-size:20px;--paper: #f6f1e6;--tile: #ecebe3;--tile-face: #fffefa;--tile-edge: #a9ad9f;--tile-side-light: #c9cec0;--tile-side-mid: #738170;--tile-side-dark: #314238;--jade: #23614f;--jade-dark: #12372d;--mint: #dbeadf;--ink: #18221d;--muted: #53635a;--line: #bdcbbc;--red: #a13a2f;--gold: #b5842f;--cobalt: #245c91;--felt: #14513f;--felt-dark: #0b3328;--rail: #5b2b2a;--rail-dark: #2a1717;--brass: #d1a047;--shadow: 0 24px 56px rgba(20, 32, 25, .16);--panel-bg: rgba(255, 250, 237, .96);--modal-bg: rgba(255, 250, 237, .95);--button-bg: #f6ead0}:root[data-contrast=high]{--paper: #fffefa;--tile: #fffefa;--tile-face: #ffffff;--tile-edge: #8f9a86;--tile-side-light: #d7ddcf;--tile-side-mid: #526a5b;--tile-side-dark: #193a2b;--jade: #14583f;--jade-dark: #07351f;--mint: #d9f0e2;--ink: #07110d;--muted: #26392f;--line: #86ad96;--red: #b50000;--gold: #8c650d;--felt: #06442c;--felt-dark: #031e14;--rail: #401111;--brass: #9a6e0a;--button-bg: #fff0bd;--shadow: 0 18px 44px rgba(0, 0, 0, .22)}:root[data-theme=low-glare]{--paper: #e7dfcf;--tile: #dfded4;--tile-face: #ece9df;--tile-edge: #969989;--tile-side-light: #afb5a7;--tile-side-mid: #687264;--tile-side-dark: #354035;--jade: #1c4938;--jade-dark: #102f23;--mint: #d2dacd;--ink: #1a1a1a;--muted: #34433c;--line: #a2b29f;--red: #912f28;--gold: #806419;--felt: #254737;--felt-dark: #172d23;--rail: #4a302f;--brass: #8f783f;--button-bg: #ded2b5;--shadow: 0 10px 28px rgba(20, 30, 24, .18);--panel-bg: rgba(231, 223, 207, .97);--modal-bg: rgba(231, 223, 207, .96)}*{box-sizing:border-box}html{overflow-x:hidden}body{margin:0;color:var(--ink);background:linear-gradient(180deg,#ffffffb8,#ece6d685),repeating-linear-gradient(90deg,rgba(24,34,29,.035) 0 1px,transparent 1px 28px),repeating-linear-gradient(0deg,rgba(24,34,29,.025) 0 1px,transparent 1px 28px),var(--paper);font-family:Georgia,Times New Roman,serif}button{cursor:pointer;font:inherit}button:disabled{cursor:not-allowed}a{color:inherit}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.mahjong-page{width:calc(100vw - 8px);min-height:100vh;display:grid;grid-template-rows:auto 1fr auto;margin:0 auto;padding:2px 0 10px}.page-shell{width:min(1320px,calc(100vw - 32px));margin:0 auto;padding:16px 0 30px}.site-header,.site-footer{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:14px 0}.mahjong-page .site-header{padding:4px 8px 6px}.mahjong-page .site-footer{padding:10px 0 6px}.mahjong-page .site-header nav a{min-height:30px;font-size:.84rem}.mahjong-page .brand{font-size:1.02rem}.brand{display:inline-flex;align-items:center;gap:10px;color:var(--jade-dark);font-size:1.15rem;font-weight:900;text-decoration:none}.brand:before{content:none}nav{display:flex;flex-wrap:wrap;gap:10px 16px}nav a{min-height:44px;display:inline-flex;align-items:center;text-decoration-thickness:.08em;text-underline-offset:.18em}.game-layout{display:grid;gap:10px;min-height:0}.hero{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:24px;align-items:center;padding:28px;border:1px solid var(--line);background:#fffdf4f2;box-shadow:var(--shadow)}.hero{grid-template-columns:minmax(0,1fr) minmax(280px,380px);min-height:360px}.hero-copy{display:grid;gap:10px}.eyebrow{margin:0;color:var(--jade-dark);font-weight:900;letter-spacing:0;text-transform:uppercase}h1,h2,p{margin-top:0}h1{margin-bottom:0;font-size:3rem;line-height:1.04;letter-spacing:0}.board-title{margin-bottom:10px;font-size:1.35rem;line-height:1.15}h2{margin-bottom:10px;font-size:1.35rem;line-height:1.15;letter-spacing:0}p,li{line-height:1.55}.hero-actions,.panel-actions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.hero-actions button,.completion-card button,.button-link{min-height:56px;border:1px solid color-mix(in srgb,var(--jade) 58%,var(--line));background:color-mix(in srgb,var(--jade) 11%,white);color:var(--ink);padding:12px 16px;font-weight:900;text-align:center}.hero-actions button:hover,.completion-card button:hover,.button-link:hover{background:color-mix(in srgb,var(--jade) 18%,white)}.hero-actions button:disabled{opacity:.5}.action-button,.floating-button,.quick-hint-button,.close-button{display:inline-flex;align-items:center;justify-content:center;gap:9px;border-radius:8px}.action-button{min-height:58px;justify-content:flex-start;border:1px solid color-mix(in srgb,var(--jade) 34%,var(--line));background:linear-gradient(180deg,#ffffffa3,#f6ead0db),var(--button-bg);color:var(--jade-dark);padding:11px 12px;text-align:left;box-shadow:inset 0 1px #ffffffb8,0 8px 18px #12372d14;transition:transform .14s ease,background .14s ease,box-shadow .14s ease}.action-button.primary{border-color:color-mix(in srgb,var(--rail) 34%,var(--brass));background:linear-gradient(180deg,color-mix(in srgb,var(--red) 78%,#ffffff 4%),var(--rail));color:#fffaf0}.action-button.rescue-button:not(:disabled),.floating-button[data-action=reshuffle]:not(:disabled){border-color:color-mix(in srgb,var(--brass) 78%,white);background:linear-gradient(180deg,#ffffffdb,#ffd35ce6),#ffd15c;color:#241a0a;box-shadow:inset 0 1px #ffffffb8,0 10px 24px #7a56162e}.action-button:hover,.floating-button:hover,.quick-hint-button:hover,.close-button:hover{transform:translateY(-1px)}.panel-actions .action-button:hover{background:linear-gradient(180deg,#ffffffb3,#e8dcb8eb),var(--button-bg);box-shadow:inset 0 1px #ffffffc7,0 10px 22px #12372d1f}.panel-actions .action-button.primary:hover{background:linear-gradient(180deg,color-mix(in srgb,var(--red) 84%,white 4%),var(--rail-dark))}.action-button:disabled,.floating-button:disabled,.quick-hint-button:disabled{opacity:.46;transform:none}.button-icon{width:1.25rem;height:1.25rem;flex:0 0 auto;display:grid;place-items:center}.button-label{min-width:0;font-weight:900;line-height:1.08;overflow-wrap:anywhere;white-space:normal}.ui-icon{width:1.15rem;height:1.15rem;display:block;fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:2}.mahjong-shell{display:grid;grid-template-columns:minmax(0,1fr) minmax(286px,330px);gap:8px;align-items:stretch;min-height:calc(100vh - 70px)}.board-panel,.control-panel,.seo-panel,.panel,.wide-panel{border:1px solid var(--line);border-radius:8px;background:var(--panel-bg);box-shadow:var(--shadow);padding:22px}.board-panel{position:relative;display:grid;grid-template-rows:auto minmax(0,1fr);min-width:0;min-height:calc(100vh - 70px);gap:8px;border-color:color-mix(in srgb,var(--rail) 32%,var(--line));background:linear-gradient(180deg,#ffffff94,#fffaedeb),var(--panel-bg);padding:10px}.board-topbar{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:18px;align-items:end}.board-title-block{min-width:0}.board-title-block .eyebrow{color:var(--red);font-size:.78rem}.board-title{margin:0;color:var(--jade-dark);font-size:1.7rem;line-height:1.04}.board-subtitle{margin:4px 0 0;color:var(--muted);font-size:.9rem;font-weight:900;line-height:1.25}.board-stats{display:grid;grid-template-columns:repeat(2,minmax(82px,1fr));gap:8px}.board-stat{min-height:58px;display:grid;align-content:center;gap:2px;border:1px solid color-mix(in srgb,var(--brass) 50%,var(--line));border-radius:8px;background:linear-gradient(180deg,#ffffffb8,#f6ead0d6),var(--button-bg);padding:8px 12px;box-shadow:inset 0 1px #ffffffb3}.board-stat span{color:var(--muted);font-size:.68rem;font-weight:900;text-transform:uppercase}.board-stat strong{color:var(--jade-dark);font-size:1.16rem;line-height:1}.side-board-summary{display:grid;gap:12px}.side-board-summary .board-title-block{display:grid;gap:4px}.side-board-summary .board-title-block .eyebrow{font-size:.66rem}.side-board-summary .board-title{margin-bottom:0;font-size:1.26rem;line-height:1.06}.side-board-summary .board-subtitle{margin-top:0;font-size:.78rem;line-height:1.2}.side-board-summary .board-stats{grid-template-columns:repeat(2,minmax(0,1fr))}.side-board-summary .board-stat{min-height:48px;padding:7px 9px}.side-board-summary .board-stat span{font-size:.58rem}.side-board-summary .board-stat strong{font-size:1rem}.board-feedback{display:none;min-height:0}.board-meta{display:flex;justify-content:space-between;gap:16px;align-items:start}.board-meta p{margin-bottom:0;color:var(--muted);font-weight:800}.progress{min-width:5rem;border:1px solid var(--line);background:var(--mint);padding:10px 12px;text-align:center;font-weight:900}.feedback,.prototype-status{min-height:3.1rem;display:flex;align-items:center;border:1px solid color-mix(in srgb,var(--jade) 24%,var(--line));border-left:6px solid var(--jade);border-radius:8px;background:linear-gradient(180deg,#ffffffc7,#fffaedf5),var(--panel-bg);padding:10px 12px;color:var(--muted);font-weight:900;line-height:1.35}.board-feedback,.board-feedback:empty,.board-feedback:not(:empty){display:none}.feedback.success{border-color:color-mix(in srgb,var(--jade) 55%,var(--line));border-left-color:var(--jade);background:color-mix(in srgb,var(--jade) 13%,white);color:var(--jade-dark)}.feedback.warning{border-color:color-mix(in srgb,var(--red) 55%,var(--line));border-left-color:var(--red);background:color-mix(in srgb,var(--red) 9%,white);color:#743126}.status-panel{display:grid;gap:10px}.scroll-hint{display:none;margin:0;border-left:6px solid var(--gold);border-radius:8px;background:color-mix(in srgb,var(--gold) 12%,white);color:var(--jade-dark);padding:10px 12px;font-weight:900;line-height:1.35}.board-scroll{position:relative;min-height:0;display:grid;align-items:start;justify-items:center;overflow-x:auto;overflow-y:auto;border-radius:8px;padding:0 2px 10px;scrollbar-gutter:stable}.board-fullscreen-button{position:absolute;z-index:850;top:18px;right:max(18px,calc((100% - var(--mahjong-board-w, 900px)) / 2 + 18px));width:46px;min-width:46px;height:46px;min-height:46px;display:inline-flex;align-items:center;justify-content:center;border:1px solid rgba(255,255,255,.18);border-radius:8px;background:#091b163d;color:#fffdf4bd;box-shadow:none;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);opacity:.42;padding:0;transition:opacity .14s ease,transform .14s ease,background .14s ease,box-shadow .14s ease,border-color .14s ease}.board-fullscreen-button:hover,.board-fullscreen-button:focus-visible{border-color:#ffffff57;background:#091b1694;color:#fffdf4;box-shadow:0 10px 22px #0003;opacity:.92;transform:translateY(-1px)}.board-fullscreen-button:focus-visible{outline:3px solid rgba(209,160,71,.62);outline-offset:3px}.board-fullscreen-button:active{opacity:1;transform:translateY(0) scale(.98)}.board-fullscreen-button .button-icon{width:1.1rem;height:1.1rem}.tile-board{position:relative;margin:0 auto;width:var(--mahjong-board-w, 900px);height:max(var(--mahjong-board-h, 660px),var(--mahjong-board-min-h, 0px));min-width:var(--mahjong-board-w, 900px);min-height:max(var(--mahjong-board-h, 660px),var(--mahjong-board-min-h, 0px));padding:0;border:8px solid var(--rail);border-radius:8px;background:radial-gradient(ellipse at 50% 42%,rgba(255,255,255,.11),transparent 58%),repeating-linear-gradient(45deg,rgba(255,255,255,.035) 0 1px,transparent 1px 8px),repeating-linear-gradient(-45deg,rgba(0,0,0,.04) 0 1px,transparent 1px 10px),linear-gradient(180deg,var(--felt),var(--felt-dark));box-shadow:inset 0 0 0 2px #b9a97e6b,inset 0 20px 55px #ffffff14,inset 0 -24px 48px #00000038,0 20px 46px #14201947}.tile-board:before{content:"";position:absolute;inset:14px;z-index:0;border:1px solid rgba(185,169,126,.24);border-radius:6px;pointer-events:none}.tile-board:after{content:"";position:absolute;inset:38px 34px;z-index:0;border-radius:50%;background:radial-gradient(ellipse at 52% 50%,rgba(0,0,0,.34),rgba(0,0,0,.12) 42%,transparent 70%);filter:blur(10px);pointer-events:none}.mahjong-tile{--tile-depth-x: 16px;--tile-depth-y: 19px;position:absolute;width:var(--mahjong-tile-w, 110px);height:var(--mahjong-tile-h, 132px);min-height:0;isolation:isolate;display:grid;place-items:center;gap:3px;overflow:visible;border:0;border-radius:10px;background:transparent;color:var(--jade-dark);padding:13px calc(var(--tile-depth-x) + 6px) calc(var(--tile-depth-y) + 7px) 9px;box-shadow:none;transform:translateY(var(--tile-lift, 0));transform-origin:52% 62%;transition:transform .14s ease,box-shadow .14s ease,filter .14s ease}.mahjong-tile:before{content:"";position:absolute;z-index:0;left:9px;right:5px;bottom:-2px;height:34px;border-radius:50%;background:#030a079e;filter:blur(11px);transform:translate(var(--tile-cast-x, 8px),var(--tile-cast-y, 10px));pointer-events:none}.mahjong-tile:after{content:"";position:absolute;z-index:1;inset:6px 6px 5px;border:1px solid rgba(74,82,69,.54);border-radius:10px;background:linear-gradient(115deg,rgba(255,255,255,.66),transparent 24%),linear-gradient(180deg,#f4f2e9,#c9c8ba 62%,#727967);box-shadow:inset 0 2px #ffffffb3,inset -10px -10px #3142383d,inset 0 -14px 20px #26312947,0 2px #ffffff3d}.mahjong-tile.raised:before{opacity:.96;height:40px;transform:translate(var(--tile-cast-x, 10px),var(--tile-cast-y, 13px)) scale(1.08)}.mahjong-tile.raised:after{box-shadow:inset 0 2px #ffffffb3,inset -10px -10px #3142383d,inset 0 -14px 20px #26312947,0 8px 16px rgb(14 30 23 / var(--tile-body-shadow, .24))}.tile-side,.tile-face-panel,.tile-glaze{position:absolute;pointer-events:none}.tile-side{z-index:2}.tile-side:before{content:"";position:absolute;pointer-events:none}.tile-side-right{top:12px;right:3px;bottom:calc(var(--tile-depth-y) + 5px);width:var(--tile-depth-x);border:1px solid rgba(46,60,50,.46);border-left:0;border-radius:0 9px 8px 0;background:linear-gradient(180deg,rgba(250,251,240,.6),transparent 17%),linear-gradient(90deg,var(--tile-side-light) 0%,var(--tile-side-mid) 50%,var(--tile-side-dark) 100%);clip-path:polygon(0 0,100% 8%,100% 100%,0 92%);box-shadow:inset 4px 0 7px #ffffff29}.tile-side-right:before{top:12%;bottom:10%;left:3px;width:2px;border-radius:999px;background:linear-gradient(180deg,#fcfff66b,#fcfff614)}.tile-side-bottom{left:10px;right:calc(var(--tile-depth-x) + 4px);bottom:3px;height:var(--tile-depth-y);border:1px solid rgba(46,60,50,.44);border-top:0;border-radius:0 0 8px 9px;background:linear-gradient(180deg,var(--tile-side-light),var(--tile-side-mid) 68%,var(--tile-side-dark));clip-path:polygon(0 0,calc(100% - var(--tile-depth-x)) 0,100% 100%,10px 100%);box-shadow:inset 0 5px 8px #ffffff1f}.tile-side-bottom:before{top:4px;right:18%;left:8%;height:2px;border-radius:999px;background:linear-gradient(90deg,#fcfff61f,#fcfff661,#fcfff614)}.tile-side-corner{right:3px;bottom:3px;width:var(--tile-depth-x);height:var(--tile-depth-y);border-radius:0 0 8px;background:linear-gradient(135deg,color-mix(in srgb,var(--tile-side-mid) 75%,white) 0%,var(--tile-side-mid) 52%,var(--tile-side-dark) 100%);clip-path:polygon(0 0,100% 22%,100% 100%,30% 100%)}.tile-face-panel{z-index:3;top:7px;right:calc(var(--tile-depth-x) + 4px);bottom:calc(var(--tile-depth-y) + 5px);left:7px;overflow:hidden;border:1px solid rgba(133,140,121,.6);border-radius:8px;background:radial-gradient(circle at 27% 17%,rgba(255,255,255,.98),rgba(255,255,255,.24) 32%,transparent 33%),linear-gradient(180deg,#fffefa 0%,var(--tile-face) 44%,#e6e3d8 100%);box-shadow:inset 0 0 0 4px #ffffff8a,inset 0 -11px 18px #424c3b24,0 1px #ffffffc2}.tile-face-panel:before,.tile-face-panel:after{content:"";position:absolute;pointer-events:none}.tile-face-panel:before{inset:5px;border:1px solid rgba(99,116,91,.22);border-radius:5px;box-shadow:inset 0 1px #ffffffb8,inset 0 -1px #4e5c441a}.tile-face-panel:after{inset:0;background:linear-gradient(135deg,rgba(255,255,255,.36) 0 12%,transparent 13% 62%,rgba(63,75,54,.09) 100%),repeating-linear-gradient(90deg,rgba(64,74,59,.028) 0 1px,transparent 1px 9px);opacity:.46}.tile-glaze{z-index:5;top:13px;left:15px;width:42%;height:24%;border-radius:999px 40% 999px 38%;background:linear-gradient(135deg,rgba(255,255,255,.68),rgba(255,255,255,.16) 62%,transparent 63%);opacity:.56}.mahjong-tile.free:hover{transform:translateY(var(--tile-hover-lift, -4px));filter:saturate(1.06)}.mahjong-tile.free:hover:before{opacity:.86;filter:blur(11px);transform:translate(var(--tile-hover-cast-x, 11px),var(--tile-hover-cast-y, 14px))}.mahjong-tile.free:hover .tile-face-panel{background:radial-gradient(circle at 27% 17%,rgba(255,255,255,1),transparent 32%),radial-gradient(circle at 76% 80%,rgba(101,118,91,.12),transparent 36%),linear-gradient(180deg,#ffffff 0%,var(--tile-face) 42%,#e9e6db 100%);box-shadow:inset 0 0 0 4px #ffffff80,inset 0 -9px 17px #4c604621,0 2px #fffc}.tile-art{position:relative;z-index:4}.tile-art{width:min(82%,5.45rem);aspect-ratio:4 / 5;min-height:0;display:grid;place-items:center;align-self:center}.tile-art-large-face{position:absolute;top:8px;left:5px;width:calc(var(--mahjong-tile-w, 110px) - var(--tile-depth-x, 16px) - 4px);height:calc(var(--mahjong-tile-h, 132px) - var(--tile-depth-y, 19px) - 11px);aspect-ratio:auto;align-self:auto}.tile-svg{width:100%;height:100%;min-height:0;display:block;filter:drop-shadow(0 1px 0 rgba(255,255,255,.65))}.card-frame,.bold-frame{fill:#ffffff47;stroke:currentColor;stroke-width:5}.card-tile.red{color:#b4232d}.card-tile.black{color:#17211d}.card-corner,.card-rank-large,.card-suit,.card-corner-suit,.card-label,.bold-abbr,.bold-label{font-family:Georgia,Times New Roman,serif;font-weight:950;dominant-baseline:middle;fill:currentColor}.card-corner{font-size:1.42rem}.card-corner-suit{font-size:1.24rem}.card-suit{font-size:2.38rem}.card-rank-large{font-size:2.08rem}.card-label-band{fill:#fffffff0;stroke:currentColor;stroke-opacity:.18;stroke-width:1.6}.card-label{fill:currentColor;font-size:.7rem;letter-spacing:0}.bold-frame{color:var(--face-accent);fill:#fff3}.bold-tile{overflow:visible}.bold-object{filter:drop-shadow(0 3px 0 rgba(17,26,22,.16))}.bold-label-band{fill:#fffdf7f5;stroke:#111a1633;stroke-width:2}.bold-main,.bold-petal{fill:var(--face-color);stroke:var(--face-accent);stroke-linecap:round;stroke-linejoin:round;stroke-width:6.1}.bold-petal{fill:color-mix(in srgb,var(--face-color) 76%,white)}.bold-accent-fill{fill:var(--face-accent);stroke:#111a163d;stroke-linejoin:round;stroke-width:3}.bold-cream{fill:#fff4d6;stroke:var(--face-accent);stroke-linecap:round;stroke-linejoin:round;stroke-width:4.5}.bold-hole{fill:color-mix(in srgb,var(--face-accent) 64%,#8b5a21);stroke:#111a162e;stroke-width:2}.bold-line,.bold-light{fill:none;stroke:var(--face-accent);stroke-linecap:round;stroke-linejoin:round;stroke-width:6.1}.bold-light{stroke:#ffffffd1;stroke-width:4.4}.bold-abbr{fill:#111a16;font-size:1.3rem;letter-spacing:0}.bold-label{fill:#111a16;font-size:.68rem;letter-spacing:0}.bamboo-stroke,.bamboo-node,.dot-cross,.dragon-line,.bird-neck,.corner-cloud,.flower-stem,.plum-branch,.red-seal-mark{fill:none;stroke-linecap:round;stroke-linejoin:round}.bamboo-stroke{stroke:#247254;stroke-width:7}.bamboo-stroke.slim,.bamboo-stroke.mini{stroke-width:4}.bamboo-node{stroke:#18533d;stroke-width:3}.bamboo-node.mini{stroke-width:2}.bamboo-stick{stroke-width:2.2}.bamboo-stick.mini{stroke-width:1.8}.bamboo-stick.green{fill:#247254;stroke:#18533d}.bamboo-stick.blue{fill:#2d5f98;stroke:#173f6f}.bamboo-stick.red{fill:#a83f32;stroke:#7f241d}.bamboo-node.green{stroke:#d7efe0}.bamboo-node.blue{stroke:#d8e7f7}.bamboo-node.red{stroke:#f5d7d2}.bamboo-leaf,.flower-leaf{fill:#2f8060;stroke:#18533d;stroke-width:2}.bamboo-leaf.mini{stroke-width:1.5}.tile-seal.green{fill:#2f806024;stroke:#247254;stroke-width:3}.dot-ring{fill:none;stroke-width:8}.tile-glyph.red,.tile-rank.red,.tile-caption.red{color:#a83f32;fill:#a83f32}.dot-ring.blue{stroke:#2d5f98}.dot-ring.green{stroke:#247254}.dot-ring.red{stroke:#a83f32}.dot-pip.outer{fill:none;stroke-width:5}.dot-pip.inner{stroke-width:0}.dot-pip.outer.blue{stroke:#2d5f98;fill:none}.dot-pip.outer.green{stroke:#247254;fill:none}.dot-pip.outer.red{stroke:#a83f32;fill:none}.dot-pip.inner.blue{fill:#2d5f98}.dot-pip.inner.green{fill:#247254}.dot-pip.inner.red{fill:#a83f32}.dot-cross{stroke:#24725475;stroke-width:3}.wind-tile.green{color:#1f6b50}.wind-tile.red{color:#a83f32}.wind-chinese{font-family:Georgia,Times 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0 0 0 4px #ffffff9e,inset 0 -9px 17px #b0802c1f,0 3px #ffffffe0;animation:tile-selected-ring 1.4s ease-in-out infinite}.mahjong-tile.hinted .tile-side-right{background:linear-gradient(180deg,rgba(245,251,244,.58),transparent 17%),linear-gradient(90deg,#c6d3c8,#728f85,#2e544d)}.mahjong-tile.hinted .tile-side-bottom,.mahjong-tile.hinted .tile-side-corner{filter:saturate(1.12) brightness(1.04)}.mahjong-tile.selected .tile-side-right{background:linear-gradient(180deg,rgba(255,249,230,.7),transparent 17%),linear-gradient(90deg,#e2d7aa,#a98e4e,#614b21)}.mahjong-tile.selected .tile-side-bottom,.mahjong-tile.selected .tile-side-corner{filter:saturate(1.18) brightness(1.08)}.mahjong-tile.hinted,.mahjong-tile.idle-hinted{animation:tile-idle-nudge 1s ease-in-out infinite}.mahjong-tile.idle-hinted .tile-face-panel{border-color:color-mix(in srgb,var(--cobalt) 72%,white);box-shadow:0 0 0 5px #245c913d,0 0 24px #245c9157,inset 0 0 0 4px #ffffff8a,inset 0 -9px 17px #245c911f,0 2px #ffffffdb}.mahjong-tile.matched{z-index:9000!important;pointer-events:none;animation:tile-match-lift .32s cubic-bezier(.2,.8,.25,1) forwards}.mahjong-tile.matched:before{animation:tile-match-shadow .32s cubic-bezier(.2,.8,.25,1) forwards}.mahjong-tile.matched:after{border-color:#4b7157b8;background:linear-gradient(115deg,rgba(255,255,255,.58),transparent 27%),linear-gradient(180deg,#fffdf4,#cbd7c6 76%,#5c765f)}.mahjong-tile.matched .tile-face-panel{animation:tile-match-face .32s ease forwards}.mahjong-tile.matched .tile-side-right,.mahjong-tile.matched .tile-side-bottom,.mahjong-tile.matched .tile-side-corner{filter:saturate(1.18) brightness(1.08)}.mahjong-tile.matched .tile-glaze{animation:tile-match-glaze .32s ease forwards}.mahjong-tile.matched .tile-art{animation:tile-match-art .32s ease forwards}.mahjong-tile.removed{visibility:hidden;opacity:0;filter:grayscale(1);pointer-events:none;transform:translateY(calc(var(--tile-lift, 0px) + 5px)) scale(.96)}.mahjong-tile.removed:before{opacity:0}.mahjong-tile.removed .tile-side,.mahjong-tile.removed .tile-face-panel,.mahjong-tile.removed .tile-glaze,.mahjong-tile.removed .tile-art{opacity:0}@keyframes tile-selected-ring{0%,to{box-shadow:0 0 0 5px #d1a04757,0 0 0 10px #a13a2f1a,0 0 24px #d1a04747,inset 0 0 0 4px #ffffff9e,inset 0 -9px 17px #b0802c1f,0 3px #ffffffe0}50%{box-shadow:0 0 0 7px #d1a04780,0 0 0 13px #a13a2f24,0 0 34px #d1a0476b,inset 0 0 0 4px #ffffffad,inset 0 -9px 17px #b0802c1f,0 3px #ffffffe6}}@keyframes tile-idle-nudge{0%,to{filter:saturate(1.04);transform:translateY(var(--tile-lift, 0px)) translate(0)}30%{filter:saturate(1.18) brightness(1.08);transform:translateY(calc(var(--tile-lift, 0px) - 4px)) translate(-3px)}60%{filter:saturate(1.18) brightness(1.08);transform:translateY(calc(var(--tile-lift, 0px) - 4px)) translate(3px)}}@keyframes tile-match-lift{0%{opacity:1;filter:saturate(1.08);transform:translateY(var(--tile-lift, 0px)) scale(1)}46%{opacity:1;filter:saturate(1.2) brightness(1.04);transform:translateY(calc(var(--tile-lift, 0px) - 16px)) scale(1.035)}to{opacity:0;filter:saturate(.72) brightness(1.14);transform:translateY(calc(var(--tile-lift, 0px) - 26px)) scale(.91)}}@keyframes tile-match-shadow{0%{opacity:.88;transform:translate(var(--tile-cast-x, 8px),var(--tile-cast-y, 10px)) scale(1)}48%{opacity:.68;transform:translate(var(--tile-hover-cast-x, 11px),var(--tile-hover-cast-y, 14px)) scale(1.12)}to{opacity:0;transform:translate(calc(var(--tile-hover-cast-x, 11px) + 12px),calc(var(--tile-hover-cast-y, 14px) + 18px)) scale(1.28)}}@keyframes tile-match-face{0%{box-shadow:inset 0 0 0 4px #ffffff80,inset 0 -9px 17px #b0802c24,0 2px #fffc}44%{border-color:#d1a047eb;box-shadow:0 0 0 4px #d1a0474d,0 0 28px #d1a0475c,inset 0 0 0 4px #ffffff9e,inset 0 -9px 17px #b0802c1f,0 3px #ffffffdb}to{border-color:#d1a04738;box-shadow:0 0 0 8px #d1a04700,inset 0 0 0 4px #ffffff4d}}@keyframes tile-match-glaze{0%{opacity:.74;transform:translate(0) scale(1)}48%{opacity:.96;transform:translate(16%,-16%) scale(1.18)}to{opacity:0;transform:translate(34%,-32%) scale(1.32)}}@keyframes tile-match-art{0%,52%{opacity:1}to{opacity:0}}@media(prefers-reduced-motion:reduce){.mahjong-tile,.mahjong-tile:before,.action-button,.floating-button,.close-button{transition:none}.mahjong-tile.hinted,.mahjong-tile.idle-hinted,.mahjong-tile.selected .tile-face-panel,.floating-button[data-action=hint],.quick-hint-button{animation:none}.celebration-confetti span{animation:none;opacity:.3}.mahjong-tile.matched{animation:tile-match-fade .12s linear forwards}.mahjong-tile.matched:before,.mahjong-tile.matched .tile-face-panel,.mahjong-tile.matched .tile-glaze,.mahjong-tile.matched .tile-art{animation:none}}@keyframes tile-match-fade{to{opacity:0}}@keyframes hint-button-breathe{0%,to{box-shadow:0 0 #d1a04757,0 12px 28px #7a561633}50%{box-shadow:0 0 0 8px #d1a04724,0 14px 34px #7a561647}}.control-panel{display:grid;gap:18px;background:linear-gradient(180deg,#ffffff9e,#fffaedf0),var(--panel-bg)}.control-panel section+section,.control-panel section+details,.control-panel details+section,.control-panel details+details{border-top:1px solid var(--line);padding-top:18px}.control-disclosure summary{min-height:44px;display:flex;align-items:center;justify-content:space-between;color:var(--jade-dark);cursor:pointer;font-weight:900;list-style:none}.control-disclosure summary::-webkit-details-marker{display:none}.control-disclosure summary:after{width:1.8rem;height:1.8rem;display:grid;place-items:center;border:1px solid color-mix(in srgb,var(--gold) 60%,var(--line));background:color-mix(in srgb,var(--gold) 12%,white);content:"+";font-weight:950}.control-disclosure[open] summary:after{content:"-"}.disclosure-body,.settings-popover-body{display:grid;gap:14px}.preference-block{display:grid;gap:8px}.preference-label,.comfort-note{margin:0;color:var(--muted);font-weight:900}.comfort-note{font-size:.9rem}.segmented-control{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px}.segmented-control button{min-height:44px;border:1px solid color-mix(in srgb,var(--jade) 45%,var(--line));background:color-mix(in srgb,var(--mint) 50%,white);color:var(--ink);padding:8px 10px;font-weight:900;line-height:1.08;overflow-wrap:anywhere;white-space:normal}.segmented-control button.active{border-color:var(--jade-dark);background:var(--jade);color:#fffdf4}.tile-skin-control{grid-template-columns:1fr}.two-option-control,.open-rule-control,.board-mode-control{grid-template-columns:repeat(2,minmax(0,1fr))}.floating-toolbar{display:none;position:fixed;z-index:60;right:12px;bottom:max(14px,env(safe-area-inset-bottom));gap:6px;border:1px solid color-mix(in srgb,var(--jade) 42%,var(--line));border-radius:8px;background:linear-gradient(180deg,#ffffffd1,#fffaedf0),var(--panel-bg);box-shadow:0 14px 34px #0d20163d;padding:6px}.floating-button{position:relative;min-width:58px;min-height:52px;flex-direction:column;border:1px solid color-mix(in srgb,var(--jade) 32%,var(--line));border-radius:8px;background:linear-gradient(180deg,#ffffffb8,#dbeadfb8),var(--mint);color:var(--jade-dark);padding:5px 8px;white-space:nowrap;transition:transform .14s ease,background .14s ease,box-shadow .14s ease}.floating-button[data-action=hint]{border-color:color-mix(in srgb,var(--brass) 70%,white);background:linear-gradient(180deg,#ffffffd6,#ffdc70e6),#ffd95a;color:#241a0a;box-shadow:0 0 #d1a04757,0 12px 28px #7a561633;animation:hint-button-breathe 2.1s ease-in-out infinite}.floating-button[data-action=hint]:hover{background:linear-gradient(180deg,#ffffffeb,#ffcd48f0),#ffcd48}.quick-hint-button{position:fixed;z-index:58;right:22px;bottom:max(22px,calc(env(safe-area-inset-bottom) + 22px));min-width:104px;min-height:64px;border:2px solid color-mix(in srgb,var(--brass) 76%,white);border-radius:8px;background:linear-gradient(180deg,#ffffffe6,#ffdb5cf0),#ffd75a;color:#241a0a;padding:10px 16px;box-shadow:0 0 #d1a04757,0 16px 34px #7a56163d;animation:hint-button-breathe 2.1s ease-in-out infinite}.quick-hint-button .button-icon{width:1.35rem;height:1.35rem}.quick-hint-button .button-label{font-size:.9rem;letter-spacing:0}.floating-button .button-icon{width:1.05rem;height:1.05rem}.floating-button .button-label{font-size:.62rem}.settings-popover{display:none;position:fixed;z-index:70;right:12px;bottom:calc(max(14px,env(safe-area-inset-bottom)) + 64px);width:min(340px,calc(100vw - 24px));max-height:calc(100vh - 96px);overflow-y:auto;border:1px solid var(--line);border-radius:8px;background:linear-gradient(180deg,#ffffffd1,#fffaedf5),var(--panel-bg);box-shadow:0 18px 44px #0d201647;padding:14px}.settings-popover:not([hidden]){display:grid;gap:12px}.settings-popover-header{display:flex;align-items:center;justify-content:space-between;gap:12px;border-bottom:1px solid var(--line);padding-bottom:10px}.settings-popover-header h3{margin:0;color:var(--jade-dark);font-size:1.05rem}.close-button{min-width:40px;min-height:40px;border:1px solid var(--line);background:color-mix(in srgb,var(--mint) 45%,white);color:var(--ink);padding:0}.floating-feedback{position:fixed;z-index:65;left:50%;bottom:max(86px,calc(env(safe-area-inset-bottom) + 86px));width:min(620px,calc(100vw - 24px));min-height:0;transform:translate(-50%,8px);border:1px solid var(--line);border-left:6px solid var(--jade);border-radius:8px;background:var(--panel-bg);box-shadow:0 14px 36px #0d201642;padding:12px 16px;color:var(--ink);font-size:.9rem;font-weight:900;line-height:1.3;opacity:0;pointer-events:none;transition:opacity .16s ease,transform .16s ease}.floating-feedback:not(:empty){opacity:1;transform:translate(-50%)}.floating-feedback.success{border-left-color:var(--jade)}.floating-feedback.warning{border-left-color:var(--red)}:root[data-hand-mode=left] .floating-toolbar,:root[data-hand-mode=left] .settings-popover{right:auto;left:12px}.steps{margin:0;padding-left:1.25rem}.seo-panel{width:100%}.seo-panel>h2,.seo-panel>p{max-width:920px}.theme-link-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin-top:16px}.theme-link-grid a{min-height:46px;display:inline-flex;align-items:center;justify-content:center;border:1px solid color-mix(in srgb,var(--jade) 28%,var(--line));background:#fffdf4c2;color:var(--jade-dark);font-weight:900;text-align:center;text-decoration:none}.theme-link-grid a:hover{border-color:color-mix(in srgb,var(--jade) 58%,var(--line));background:#f5faf1f0}.completion-card{position:absolute;z-index:90;top:50%;left:50%;width:min(460px,calc(100% - 28px));min-height:280px;max-height:min(520px,calc(100vh - 112px));display:grid;place-items:center;gap:10px;overflow:hidden;border:2px solid color-mix(in srgb,var(--gold) 60%,var(--line));border-radius:8px;background:radial-gradient(circle at 50% 0%,rgba(255,255,255,.86),transparent 44%),linear-gradient(180deg,color-mix(in srgb,var(--gold) 18%,white),#fffaedfa);box-shadow:0 26px 80px #0d201657,inset 0 1px #ffffffdb;padding:26px;text-align:center;transform:translate(-50%,-50%)}.completion-card>*{position:relative;z-index:1}.completion-card h2{margin:0;color:var(--jade-dark);font-size:1.9rem}.completion-card p{margin-bottom:0;max-width:340px;font-weight:800}.completion-card button{min-width:min(100%,260px);margin-top:6px;border-color:color-mix(in srgb,var(--jade) 62%,var(--line));background:linear-gradient(180deg,color-mix(in srgb,var(--jade) 88%,white 5%),var(--jade-dark));color:#fffdf4;box-shadow:0 12px 26px #12372d38}.completion-card button:hover{background:linear-gradient(180deg,color-mix(in srgb,var(--jade) 96%,white 3%),#092c22)}.celebration-confetti{position:absolute;inset:0;z-index:0;overflow:hidden;pointer-events:none}.celebration-confetti span{position:absolute;top:-18px;left:var(--confetti-x, 50%);width:10px;height:18px;border-radius:3px;background:var(--confetti-color, var(--gold));opacity:.88;transform:rotate(var(--confetti-rotate, 0deg));animation:confetti-fall 2.8s ease-in-out infinite;animation-delay:var(--confetti-delay, 0s)}.celebration-confetti span:nth-child(1){--confetti-x: 8%;--confetti-color: var(--red);--confetti-delay: 0s;--confetti-rotate: 16deg}.celebration-confetti span:nth-child(2){--confetti-x: 18%;--confetti-color: var(--brass);--confetti-delay: .35s;--confetti-rotate: -24deg}.celebration-confetti span:nth-child(3){--confetti-x: 28%;--confetti-color: var(--jade);--confetti-delay: .12s;--confetti-rotate: 48deg}.celebration-confetti span:nth-child(4){--confetti-x: 39%;--confetti-color: var(--cobalt);--confetti-delay: .55s;--confetti-rotate: -38deg}.celebration-confetti span:nth-child(5){--confetti-x: 48%;--confetti-color: var(--gold);--confetti-delay: .25s;--confetti-rotate: 9deg}.celebration-confetti span:nth-child(6){--confetti-x: 57%;--confetti-color: var(--red);--confetti-delay: .7s;--confetti-rotate: 31deg}.celebration-confetti span:nth-child(7){--confetti-x: 66%;--confetti-color: var(--jade);--confetti-delay: .18s;--confetti-rotate: -12deg}.celebration-confetti span:nth-child(8){--confetti-x: 73%;--confetti-color: var(--brass);--confetti-delay: .45s;--confetti-rotate: 26deg}.celebration-confetti span:nth-child(9){--confetti-x: 82%;--confetti-color: var(--cobalt);--confetti-delay: .05s;--confetti-rotate: -45deg}.celebration-confetti span:nth-child(10){--confetti-x: 90%;--confetti-color: var(--gold);--confetti-delay: .62s;--confetti-rotate: 18deg}.celebration-confetti span:nth-child(11){--confetti-x: 14%;--confetti-color: var(--jade);--confetti-delay: .9s;--confetti-rotate: -8deg}.celebration-confetti span:nth-child(12){--confetti-x: 78%;--confetti-color: var(--red);--confetti-delay: 1s;--confetti-rotate: 38deg}@keyframes confetti-fall{0%{opacity:0;transform:translateY(-22px) rotate(var(--confetti-rotate, 0deg))}16%{opacity:.9}to{opacity:0;transform:translateY(330px) rotate(calc(var(--confetti-rotate, 0deg) + 240deg))}}.completion-card[hidden]{display:none}.site-footer{border-top:1px solid var(--line);color:var(--muted);margin-top:22px}.content-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-top:18px}.wide-panel{margin-top:18px}.check-list{margin:14px 0 0;padding-left:1.2rem}.check-list li+li{margin-top:8px}.faq-list{display:grid;gap:18px}.faq-list article{border-bottom:1px solid var(--line);padding-bottom:18px}.button-link{display:inline-flex;align-items:center;justify-content:center;text-decoration:none}.visual{min-height:260px;border:1px solid color-mix(in srgb,var(--jade) 28%,var(--line));background:linear-gradient(145deg,#ffffffb8,#fffdf4f0),color-mix(in srgb,var(--jade) 10%,white);box-shadow:inset 0 0 0 10px #ffffff8a}.tile-stack{display:flex;gap:14px;align-items:center;justify-content:center;flex-wrap:wrap;padding:28px}.tile-stack span{width:78px;height:88px;display:grid;place-items:center;border:2px solid #d8c9a6;background:var(--tile);color:var(--jade-dark);font-size:2rem;font-weight:900;box-shadow:0 10px 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.button-label{font-size:.58rem}.hero-actions{grid-template-columns:repeat(4,minmax(0,1fr))}.content-grid{grid-template-columns:1fr}.theme-link-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:1180px){.mahjong-page .site-header{min-height:34px;justify-content:center;padding:3px 8px 5px}.mahjong-page .site-header nav{display:none}.floating-toolbar{top:58px}}@media(min-width:900px)and (max-width:1199px)and (orientation:landscape){.mahjong-page{min-height:100vh;padding-bottom:8px}.mahjong-shell:not(.is-fullscreen){grid-template-columns:minmax(0,1fr) minmax(250px,292px);min-height:calc(100vh - 48px);align-items:stretch}.mahjong-shell:not(.is-fullscreen)>.board-panel>.board-topbar{display:none}.mahjong-shell:not(.is-fullscreen) .board-panel{min-height:calc(100vh - 48px);padding:8px}.mahjong-shell:not(.is-fullscreen) .board-scroll{height:calc(100vh - 64px);max-height:calc(100vh - 64px)}.mahjong-shell:not(.is-fullscreen) .control-panel{min-height:calc(100vh - 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.mahjong-page{width:100vw;min-height:100vh;padding:0 0 max(6px,env(safe-area-inset-bottom))}:root[data-viewport-profile=phone] .mahjong-page .site-header,:root[data-viewport-profile=phone] .mahjong-page .site-header nav,:root[data-viewport-profile=phone] .mahjong-page .site-footer,:root[data-viewport-profile=phone] .control-panel,:root[data-viewport-profile=phone] .settings-popover{display:none}:root[data-viewport-profile=phone] .mahjong-page .brand{font-size:.86rem}:root[data-viewport-profile=phone] .game-layout{gap:4px}:root[data-viewport-profile=phone] .mahjong-shell:not(.is-fullscreen){grid-template-columns:1fr;grid-template-rows:minmax(0,1fr) auto;gap:2px;height:100vh}:root[data-viewport-profile=phone] .mahjong-page .board-panel,:root[data-viewport-profile=phone] .mahjong-shell:not(.is-fullscreen) .board-panel{min-height:0;gap:2px;border-right:0;border-left:0;border-radius:0;box-shadow:none;padding:2px 4px 4px}:root[data-viewport-profile=phone] 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18px,1220px)}.site-header,.site-footer,.board-meta{align-items:stretch;flex-direction:column}.game-hero,.hero,.board-panel,.control-panel,.seo-panel,.panel,.wide-panel{padding:16px}.mahjong-page .site-header{min-height:34px;justify-content:center;padding:2px 6px 4px}.mahjong-page .site-header nav{display:none}.mahjong-page .brand{font-size:.96rem}.mahjong-page .brand:before{width:22px;height:27px;border-radius:4px}.mahjong-page .board-panel{gap:6px;border-right:0;border-left:0;border-radius:6px;box-shadow:none;padding:6px}h1{font-size:2.35rem}.hero-actions{grid-template-columns:1fr 1fr}.theme-link-grid{grid-template-columns:1fr}.mahjong-page,.page-shell{padding-bottom:calc(82px + env(safe-area-inset-bottom))}.site-header nav,.site-footer nav{width:100%;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 12px}.site-header nav a,.site-footer nav a{min-width:0;min-height:36px;font-size:.9rem;overflow-wrap:anywhere}.board-scroll{justify-items:start;margin-right:-6px;margin-left:-6px;padding:0 6px calc(74px + env(safe-area-inset-bottom))}.board-topbar{grid-template-columns:1fr;gap:8px}.mahjong-page .board-title-block .eyebrow{font-size:.6rem}.board-title{font-size:1.18rem}.board-subtitle{font-size:.72rem}.board-stats{width:100%;grid-template-columns:repeat(2,minmax(0,1fr))}.board-stat{min-height:42px;padding:5px 8px}.board-stat span{font-size:.58rem}.board-stat strong{font-size:1rem}.board-feedback{min-height:0;border-left-width:4px;padding:7px 9px;font-size:.76rem;line-height:1.22}.board-feedback:not(:empty){display:none}.tile-board{border-radius:0}:root[data-board-mode=phone] .tile-board{border-width:6px}.scroll-hint{display:block;border-left-width:4px;padding:4px 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