:root{--ink:#20332c;--muted:#5d6b61;--cream:#f6f1e8;--paper:#fffdf8;--line:#d9dfd4;--green:#285947;--mint:#e1eee3;--yellow:#f3c95f;--orange:#de7f55;--shadow:0 24px 70px rgba(42,68,47,.12)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--cream);font-family:'DM Sans','Noto Sans JP',sans-serif;line-height:1.7}button,a{touch-action:manipulation}button{font:inherit;cursor:pointer}a{color:inherit}button:focus-visible,a:focus-visible{outline:3px solid #dc7b45;outline-offset:4px}.wrap{width:min(1120px,calc(100% - 48px));margin-inline:auto}.site-header{height:92px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;font-size:18px;font-weight:800;white-space:nowrap}.brand-mark{display:grid;place-items:center;width:39px;height:39px;border-radius:12px;background:var(--green);color:#fff;line-height:1;font-size:19px;letter-spacing:-2px}.site-header nav{display:flex;gap:30px}.site-header nav a,.footer-links a{font-size:13px;text-decoration:none;font-weight:700}.site-header nav a:hover,.footer-links a:hover{text-decoration:underline}.eyebrow{margin:0 0 15px;color:#527562;font-size:12px;font-weight:800;letter-spacing:.16em}.hero{min-height:530px;display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:36px;padding:40px 0 68px}.hero-copy h1{margin:0;font-size:clamp(42px,5vw,66px);line-height:1.24;letter-spacing:-.07em}.hero-copy h1 em{color:#d8764e;font-style:normal}.hero-copy>p:not(.eyebrow){max-width:440px;color:var(--muted);font-size:16px;margin:22px 0 28px}.hero-link{display:inline-flex;align-items:center;justify-content:center;gap:25px;min-height:52px;padding:12px 25px;border-radius:14px;background:var(--green);color:#fff;text-decoration:none;font-weight:800;font-size:14px;box-shadow:0 12px 22px rgba(27,77,53,.15)}.hero-link:hover,.next-button:hover{background:#1d4234}.hero-art{position:relative;min-height:370px;background:#e3ebde;border-radius:40px;overflow:hidden;display:flex;align-items:center;justify-content:center;gap:13px;transform:rotate(-2deg)}.hero-art:before,.hero-art:after{content:"";position:absolute;border:2px solid #b7cdbb;border-radius:50%;width:350px;height:350px;right:-120px;top:-165px}.hero-art:after{width:220px;height:220px;left:-80px;top:auto;bottom:-130px}.art-card{position:relative;z-index:1;display:grid;place-items:center;width:77px;height:106px;border-radius:19px;background:var(--paper);font-size:45px;font-weight:800;box-shadow:0 11px 18px rgba(49,70,51,.13)}.c1{transform:rotate(-12deg) translateY(8px)}.c2{transform:rotate(8deg) translateY(-10px)}.art-symbol,.art-equals{position:relative;z-index:1;font-size:39px;font-weight:600;color:#567564}.art-result{position:relative;z-index:1;color:#d87952;font-size:76px;font-weight:800;letter-spacing:-.1em}.spark{position:absolute;right:-24px;top:-22px;color:#e1b943;font-size:34px}.game-section{background:#e9eee5;padding:77px 0 76px}.game-wrap{max-width:790px}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:23px}.section-heading h2,.content-heading h2,.about-grid h2{margin:0;font-size:clamp(30px,4vw,42px);line-height:1.3;letter-spacing:-.04em}.daily-note{font-size:13px;color:var(--muted);font-weight:700;margin:0 0 5px}.mode-switch{display:flex;gap:10px;margin-bottom:17px}.mode{min-height:44px;padding:10px 23px;border:1px solid #c9d8ca;background:transparent;border-radius:999px;color:var(--green);font-size:14px;font-weight:800}.mode.active{background:var(--green);color:#fff;border-color:var(--green)}.game-card{padding:35px 42px 31px;background:var(--paper);border:1px solid #e5e9df;border-radius:26px;box-shadow:var(--shadow)}.game-top{display:flex;justify-content:space-between;align-items:start;gap:20px}.game-kicker{margin:0 0 3px;color:#b67a4d;font-size:11px;font-weight:800;letter-spacing:.15em}.game-top h3{margin:0;font-size:23px;line-height:1.4}.target{display:flex;flex-direction:column;align-items:center;justify-content:center;min-width:68px;height:68px;border-radius:19px;background:#f8edc6;color:#664c16}.target small{font-size:10px;line-height:1;font-weight:800}.target strong{font-size:30px;line-height:1.2;letter-spacing:-.1em}.progress{display:flex;justify-content:space-between;margin:28px 0 15px;color:var(--muted);font-size:12px;font-weight:800}.tiles{display:flex;justify-content:center;gap:13px;min-height:107px}.tile{min-width:88px;max-width:142px;flex:1;min-height:105px;padding:8px;border:2px solid #d6e1d7;border-radius:18px;background:#f5f8f2;color:var(--ink);font-size:33px;font-weight:800;box-shadow:0 5px 0 #d6e1d7;transition:transform .15s,border-color .15s,background .15s}.tile:hover{transform:translateY(-3px)}.tile.selected{background:#fff0cf;border-color:#cf9e38;box-shadow:0 5px 0 #cf9e38}.tile small{display:block;font-size:10px;font-weight:600;color:var(--muted);line-height:1.2;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.selection-help{text-align:center;min-height:27px;margin:20px 0 15px;color:var(--muted);font-size:13px}.operators{display:flex;justify-content:center;gap:12px}.operators button{width:65px;height:56px;border:1px solid #b8cebd;border-radius:13px;background:var(--mint);color:var(--green);font-size:27px;font-weight:700}.operators button:hover:not(:disabled){background:#cbe2d0}.operators button:disabled{opacity:.42;cursor:not-allowed}.game-actions{display:flex;justify-content:center;flex-wrap:wrap;gap:5px 18px;margin:20px 0 0}.text-button{border:0;background:transparent;color:var(--green);font-weight:800;font-size:12px;text-decoration:underline;text-underline-offset:3px;padding:10px 4px}.text-button:disabled{opacity:.4;text-decoration:none;cursor:not-allowed}.game-message{min-height:46px;margin-top:10px;padding:12px 15px;text-align:center;background:#f5f3e9;border-radius:12px;font-size:13px;font-weight:600;color:#536153}.game-message.success{background:#def0dc;color:#235537}.game-message.error{background:#fbe6db;color:#9b4e36}.next-button{display:block;width:100%;min-height:48px;margin-top:15px;border:0;border-radius:12px;background:var(--green);color:white;font-weight:800}.next-button[hidden]{display:none}.game-footnote{text-align:center;color:var(--muted);font-size:12px;line-height:1.8;margin:19px 5px 0}.content-section{padding:96px 0 105px}.content-heading{max-width:580px;margin-bottom:39px}.content-heading>p:last-child{color:var(--muted);margin:16px 0 0}.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.steps article{min-height:215px;padding:27px;background:var(--paper);border:1px solid #e8e5d9;border-radius:19px}.step-num{color:#cf905b;font-size:24px;font-weight:800}.steps h3{margin:12px 0 6px;font-size:18px}.steps p{margin:0;color:var(--muted);font-size:13px;line-height:1.9}.about-section{padding:85px 0;background:#dce8dd}.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:70px}.about-grid>div:last-child p{color:#4b6352;margin:0 0 16px;font-size:14px;line-height:2}.about-grid .ad-disclosure{font-size:12px!important;border-top:1px solid #b8d1bb;padding-top:17px}.site-footer{display:flex;align-items:start;justify-content:space-between;gap:25px;padding:45px 0 55px}.site-footer p{margin:5px 0;color:var(--muted);font-size:12px}.site-footer small{font-size:11px;color:var(--muted)}.footer-links{display:flex;gap:23px}.policy{max-width:790px;padding:62px 0 105px}.policy h1{font-size:clamp(34px,5vw,50px);line-height:1.3;margin:0}.policy-date{font-size:13px;color:var(--muted);margin:10px 0 45px}.policy section{border-top:1px solid var(--line);padding:27px 0}.policy h2{font-size:20px;margin:0 0 12px}.policy section p{font-size:14px;color:var(--muted);line-height:2;margin:0}.policy .hero-link{margin-top:20px}
@media(max-width:750px){.site-header{height:75px}.site-header nav{gap:13px}.site-header nav a{font-size:11px}.site-header nav a[href="#about"]{display:none}.hero{grid-template-columns:1fr;padding:35px 0 55px;gap:32px}.hero-art{min-height:240px}.hero-copy h1{font-size:clamp(39px,10vw,54px)}.hero-copy>p:not(.eyebrow){font-size:14px}.art-card{width:61px;height:82px;font-size:34px}.art-symbol,.art-equals{font-size:27px}.art-result{font-size:55px}.game-section{padding:58px 0}.game-card{padding:27px 20px}.steps,.about-grid{grid-template-columns:1fr;gap:14px}.steps article{min-height:0}.content-section{padding:73px 0}.about-section{padding:70px 0}.site-footer{flex-wrap:wrap}.footer-links{flex-wrap:wrap}.policy{padding-top:50px}}
@media(max-width:430px){.wrap{width:min(100% - 28px,1120px)}.site-header nav a[href="#how-to"]{display:none}.hero-art{gap:8px}.hero-copy h1{font-size:40px}.game-card{padding:24px 14px}.game-top h3{font-size:18px}.target{min-width:56px;height:56px;border-radius:14px}.target strong{font-size:25px}.tiles{gap:7px;min-height:84px}.tile{min-width:0;min-height:82px;font-size:27px;border-radius:13px}.tile small{font-size:8px}.operators{gap:8px}.operators button{width:57px;height:50px}.game-actions{gap:3px 10px}.text-button{font-size:11px}.mode{padding:9px 17px;font-size:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.tile{transition:none}.tile:hover{transform:none}}