:root{color:#183b43;font-synthesis:none;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;background:#edf2e8;font-family:Yu Gothic UI,Hiragino Kaku Gothic ProN,Meiryo,sans-serif}*{box-sizing:border-box}body{background:radial-gradient(at 15% 10%,#f9f5df 0,#0000 55%),#edf2e8;margin:0}button,input{font:inherit}button{cursor:pointer;touch-action:manipulation}button:disabled{cursor:default;opacity:.4}button:focus-visible,input:focus-visible,summary:focus-visible,#stage:focus-visible{outline-offset:3px;outline:3px solid #d9656a}[hidden]{display:none!important}.app{max-width:960px;margin:0 auto;padding:22px 28px 12px}.heading{justify-content:space-between;align-items:center;margin-bottom:14px;display:flex}.eyebrow{letter-spacing:.2em;color:#4b726d;margin:0 0 7px;font-size:10px;font-weight:700}h1{letter-spacing:.05em;margin:0;font-size:clamp(22px,3.6vw,33px);font-weight:800}.title-wave{color:#42a5a0;margin-left:10px;display:inline-block}.tagline{color:#527168;text-align:right;margin:0;font-size:12px;line-height:1.8}.workspace{grid-template-columns:minmax(0,1fr) 300px;align-items:start;gap:26px;display:grid}.river-card{background:#f7f6e7;border:1px solid #d6dfcd;border-radius:22px;min-width:0;padding:9px 12px 12px;box-shadow:0 12px 35px #2343360b}.river-caption{color:#52746e;justify-content:space-between;margin:1px 4px 7px;font-size:11px;font-weight:700;display:flex}.river-caption>span:first-child{color:#183f48}.river-stage{aspect-ratio:480/780;touch-action:none;cursor:crosshair;border-radius:15px;width:auto;max-width:100%;height:min(690px,100svh - 155px);margin:auto;position:relative;overflow:hidden}canvas{width:100%;height:100%;display:block}.controls{min-width:0;padding-top:9px}.scoreboard{border-bottom:1px solid #cbd6c6;justify-content:space-between;align-items:center;padding:0 2px 17px;display:flex}.scoreboard span{color:#56736a;font-size:11px;display:block}.scoreboard strong{letter-spacing:-.04em;font-variant-numeric:tabular-nums;font-size:42px;line-height:1.15;display:block}.scoreboard strong span{margin-left:5px;font-size:14px;display:inline}.best{text-align:right}.best strong{color:#64776a;margin-top:7px;font-size:25px}.result{background:#fae9aa;border-radius:12px;flex-direction:column;gap:4px;margin-top:12px;padding:12px 14px;display:flex}.result strong{font-size:20px}.result span{color:#5f654a;font-size:12px}.settings{margin-top:23px}.settings label{justify-content:space-between;font-size:13px;font-weight:700;display:flex}.settings output{color:#517569;font-size:12px;font-weight:500}input[type=range]{accent-color:#206f74;cursor:ew-resize;touch-action:pan-y;width:100%;min-width:0;height:44px;margin:0 0 10px}.actions{grid-template-columns:1fr;gap:9px;display:grid}button{border:0;border-radius:11px;min-height:48px;padding:10px 14px;font-weight:700}.actions button{justify-content:space-between;align-items:center;display:flex}.primary{color:#fffbed;background:#173f48;font-size:15px;box-shadow:0 5px #0b2e36}.primary:active{transform:translateY(2px);box-shadow:0 3px #0b2e36}.secondary{color:#325446;background:#e0e7d7;border:1px solid #c5d0ba;font-size:13px}.run-tools{color:#6e7f71;flex-wrap:wrap;align-items:center;gap:10px;margin-top:12px;font-size:11px;display:flex}.run-tools button{color:#375c57;text-underline-offset:3px;background:0 0;min-height:44px;padding:0 7px;font-size:11px;text-decoration:underline}.hint{color:#46685e;min-height:38px;margin:12px 0;font-size:12px;line-height:1.7}.legend{border-top:1px solid #cbd6c6;gap:15px;padding:10px 0 12px;font-size:11px;display:flex}.legend span{align-items:center;gap:4px;display:flex}.legend i{font-size:19px;font-style:normal}.naruto-icon{color:#d45180}.monster-icon{color:#645293}.guide{color:#5c7061;font-size:11px;line-height:1.8}.guide summary{cursor:pointer;align-items:center;min-height:44px;font-weight:700;display:flex}.guide summary:before{content:"＋";margin-right:7px}.guide[open] summary:before{content:"−"}.guide p{margin:8px 0}footer{text-align:center;letter-spacing:.08em;color:#809078;margin-top:13px;font-size:10px}.pause-overlay{color:#244d50;background:#eaf4e3dd;flex-direction:column;justify-content:center;align-items:center;gap:13px;font-size:15px;display:flex;position:absolute;inset:0}.pause-overlay p{margin:0}.pause-overlay button{color:#fff;background:#173f48;min-width:150px}.sr-only{clip:rect(0,0,0,0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}@media (max-width:620px){.app{padding:12px 14px 8px}.heading{margin-bottom:9px}.eyebrow{margin-bottom:3px;font-size:8px}h1{font-size:22px}.tagline{display:none}.workspace{grid-template-columns:1fr;gap:10px}.river-card{border-radius:16px;padding:6px 7px 7px}.river-caption{margin-bottom:4px;font-size:10px}.river-stage{border-radius:10px;height:clamp(245px,100svh - 376px,560px)}.controls{padding:0}.scoreboard{padding:0 3px 7px}.scoreboard strong{font-size:25px}.scoreboard span{font-size:9px}.best strong{margin-top:2px;font-size:19px}.settings{grid-template-columns:1fr 1fr;gap:0 15px;margin-top:9px;display:grid}.settings label{font-size:11px}.settings label[for=position]{grid-area:1/1}.settings label[for=angle]{grid-area:1/2}.settings input{grid-row:2;height:44px;margin:0}.settings output{font-size:10px}.actions{grid-template-columns:1.15fr 1fr;gap:9px}.actions button{min-height:44px;padding:8px 12px;font-size:12px}.run-tools{float:right;gap:10px;margin-top:3px}.run-tools button{min-height:44px}.hint{clear:both;min-height:18px;margin:6px 0 4px;font-size:10px}.legend{border:0;justify-content:center;padding:6px 0 0;font-size:10px}.guide summary{justify-content:center;min-height:32px}.result{flex-direction:row;align-items:center;gap:10px;margin:4px 0;padding:5px 9px}.result strong{font-size:16px}.result span{font-size:10px}footer{margin-top:5px;font-size:9px}}@media (min-width:621px) and (max-height:540px){.app{padding:8px 16px}.heading{margin-bottom:6px}.eyebrow{margin-bottom:2px;font-size:8px}h1{font-size:21px}.workspace{grid-template-columns:minmax(0,1fr) 330px;gap:16px}.river-stage{height:calc(100svh - 97px)}.controls{padding-top:0}.scoreboard{padding-bottom:5px}.scoreboard strong{font-size:26px}.best strong{font-size:18px}.settings{grid-template-columns:1fr 1fr;gap:0 15px;margin-top:7px;display:grid}.settings label[for=position]{grid-area:1/1}.settings label[for=angle]{grid-area:1/2}.settings input{grid-row:2;margin:0}.settings label{font-size:11px}.settings output{font-size:10px}.actions{grid-template-columns:1fr 1fr;gap:6px}.actions button{min-height:44px;padding:8px;font-size:11px}.run-tools{margin-top:3px}.run-tools button{min-height:44px}.hint{min-height:0;margin:3px 0;font-size:10px}.legend{padding:4px 0;font-size:10px}.guide summary{min-height:30px}.result{flex-direction:row;gap:10px;margin-top:4px;padding:5px 9px}.result strong{font-size:15px}.result span{font-size:10px}footer{margin-top:5px}}@media (prefers-reduced-motion:reduce){.primary:active{transform:none}}#next-river{white-space:nowrap;background:#f7f6e7;border:1px solid #c5d0ba;border-radius:9px;min-height:44px;padding:0 10px;text-decoration:none}