:root{color-scheme:dark;--paper:#e5eddf;--muted:#9aaa9f;--green:#85c799;--line:#294837;--bg:#0a1410}
*{box-sizing:border-box}
html{background:var(--bg);color:var(--paper);font-family:"Yu Gothic","Meiryo",system-ui,sans-serif}
body{margin:0;background-color:#10271b;background-image:linear-gradient(90deg,transparent,rgba(8,24,16,.7) 24%,rgba(8,24,16,.7) 76%,transparent),url("assets/forest-pattern.svg"),radial-gradient(ellipse at 8% 0%,#315c37 0,transparent 55%),radial-gradient(ellipse at 100% 50%,#234d31 0,transparent 65%);background-size:auto,240px 320px,100% 100%,100% 100%;background-attachment:scroll}
main{width:min(1200px,calc(100% - 48px));margin:auto}
.masthead{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:22px 0 18px}
h1{font-size:23px;line-height:1.25;margin:0;letter-spacing:.04em;font-weight:700}
h1 span{font-size:14px;letter-spacing:.07em;margin-left:14px;color:var(--green);font-weight:500}
.version{font-size:12px;color:var(--muted);white-space:nowrap}
.game-frame{width:min(100%,calc((100svh - 140px)*16/9));margin:auto;border:1px solid #43654c;box-shadow:0 0 0 4px #14271c,0 12px 36px #0005;background:#000;aspect-ratio:16/9}
iframe{display:block;border:0;width:100%;height:100%;background:#000}
.play-note{display:flex;justify-content:space-between;gap:16px;color:var(--muted);font-size:12px;padding:10px 0}
.play-note p{margin:0;line-height:1.8}
kbd{font-family:inherit;font-size:11px;color:#dfebdf;background:#1d3024;border:1px solid #4a6952;border-bottom-width:2px;padding:1px 5px;border-radius:2px}
.mobile-note{display:none}
.manual{margin-top:48px}
.section-title{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:18px}
h2{font-size:17px;letter-spacing:.09em;margin:0;font-weight:600}
h2 span{font-size:11px;color:var(--green);margin-left:12px;letter-spacing:.15em}
.hint{font-size:11px;color:var(--muted)}
.manual-link{display:block;border:1px solid var(--line);background:#19251b;outline-offset:6px}
.manual-link:hover{border-color:var(--green)}
.manual-link:focus-visible{outline:2px solid var(--green)}
.manual-link img{display:block;width:100%;height:auto}
.about{border-top:1px solid var(--line);margin-top:48px;padding:28px 0 32px}
.about h2{font-size:12px;color:var(--green);letter-spacing:.18em}
.about p{font-size:14px;line-height:1.9;margin:15px 0 24px}
.credits{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin:0}
dt{font-size:10px;color:var(--muted);letter-spacing:.08em;line-height:1.8}
dd{font-size:15px;margin:8px 0 0}
footer{display:flex;justify-content:space-between;gap:16px;border-top:1px solid var(--line);padding:20px 0 32px;color:var(--muted);font-size:11px}
@media(max-width:700px){main{width:calc(100% - 28px)}.masthead{padding:18px 0;align-items:flex-start}h1{font-size:20px}h1 span{display:block;margin:5px 0 0;font-size:12px}.version{font-size:10px;padding-top:5px}.game-frame{width:100%}.play-note{font-size:11px}.play-note p:last-child{display:none}.mobile-note{display:block;color:var(--muted);font-size:12px;line-height:1.8;margin:4px 0 0}.manual{margin-top:32px}.section-title{display:block;margin-bottom:12px}h2{font-size:16px}h2 span{font-size:10px}.hint{display:block;margin-top:8px}.credits{grid-template-columns:1fr 1fr;gap:24px 12px}.about{margin-top:30px}footer{flex-direction:column;gap:6px;font-size:10px}}