:root{color-scheme:light;--ink:#172339;--muted:#66758b;--bg:#f6f9fb;--white:#fff;--line:#e3eaf1;--teal:#0f766e;--teal-dark:#105e59;--teal-light:#e7f5f2;--amber:#f59e0b;--shadow:0 18px 55px rgba(26,48,67,.07)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--bg);font-family:system-ui,-apple-system,"Hiragino Kaku Gothic ProN","Hiragino Sans",Meiryo,sans-serif;line-height:1.65}button,input{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #49b4ac;outline-offset:3px}button svg,.save-note svg{height:18px;width:18px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;vertical-align:middle}button[hidden],[hidden]{display:none!important}.page-wrap{max-width:1010px;margin:0 auto;padding:0 20px}.site-header{height:83px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line)}.brand{color:var(--ink);text-decoration:none;display:flex;gap:10px;align-items:center;font-weight:800;font-size:23px;letter-spacing:-.06em}.brand img{filter:drop-shadow(0 3px 5px rgba(15,118,110,.12))}.brand-dot{color:var(--teal)}.header-note{font-size:12px;font-weight:700;color:var(--teal);background:var(--teal-light);border-radius:50px;padding:7px 12px}.header-dot{display:inline-block;background:#1caa89;border-radius:50%;height:7px;width:7px;margin-right:5px}.intro{text-align:center;padding:44px 0 30px}.eyebrow,.game-kicker,.dialog-eyebrow{font-size:10px;font-weight:800;letter-spacing:.2em;color:var(--teal)}.intro h1{font-size:clamp(27px,5vw,39px);margin:9px 0 7px;letter-spacing:-.05em;line-height:1.35}.intro h1 span{color:var(--teal)}.intro p{margin:0;color:var(--muted);font-size:14px}.game-shell{background:white;border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow);padding:28px 32px 25px}.game-header{display:flex;justify-content:space-between;gap:15px;align-items:center}.game-header h2{font-size:23px;margin:4px 0 0;letter-spacing:-.04em}.count-tag{font-size:13px;vertical-align:middle;display:inline-block;color:var(--teal);background:var(--teal-light);padding:3px 11px;border-radius:30px;letter-spacing:0}.btn{border-radius:11px;min-height:43px;border:1px solid transparent;padding:9px 16px;font-size:13px;font-weight:750;display:inline-flex;align-items:center;justify-content:center;gap:8px;transition:background .15s,transform .15s,border-color .15s}.btn:active{transform:translateY(1px)}.btn-primary{color:#fff;background:var(--teal);border-color:var(--teal)}.btn-primary:hover{background:var(--teal-dark)}.btn-outline{background:white;color:#34445b;border-color:#d4dfe8}.btn-outline:hover{background:#f1f7f7}.btn-setting{white-space:nowrap}.hint-line{background:#f0faf7;border:1px solid #d6eee8;color:#326f65;text-align:center;padding:9px 12px;border-radius:10px;margin:23px 0 13px;font-weight:700;font-size:13px}.hint-icon{color:#e39b19;margin-right:5px}.board-frame{border:1px solid var(--line);border-radius:17px;overflow:hidden;background:white}.board-topline{display:flex;justify-content:space-between;align-items:center;background:#fafcfd;padding:11px 16px;border-bottom:1px solid var(--line);font-size:12px;font-weight:750;color:#5a687b}.step-dot{display:inline-grid;place-items:center;border:1px solid #a3d9d1;border-radius:50%;background:var(--teal-light);color:var(--teal);width:22px;height:22px;margin-right:5px}.progress-label{color:var(--teal)}.board-scroll{overflow-x:auto;overflow-y:hidden;overscroll-behavior-x:contain;scrollbar-color:#bbd2d0 #f5f8f8;padding:19px 12px 8px;scroll-behavior:smooth}.board-stage{width:100%;min-width:calc(var(--players, 4) * 76px)}.names-row,.results-row{display:grid;grid-template-columns:repeat(var(--players,4),minmax(0,1fr));align-items:center}.name-button{display:block;text-align:center;width:calc(100% - 8px);min-height:50px;padding:7px 3px;margin:0 auto;border:1px solid #b7ddd6;color:#11685f;border-radius:10px;background:#eaf8f4;font-size:12px;font-weight:800;overflow-wrap:anywhere;line-height:1.3}.name-button:hover:not(:disabled){background:#d3f3ea;border-color:#74bfb0}.name-button.selected{background:var(--teal);border-color:var(--teal);color:white}.name-button.done{color:#677a87;background:#eff3f5;border-color:#dbe5e9;opacity:.85}.amida-svg{display:block;width:100%;height:426px;margin:1px auto;overflow:visible}.ladder-vertical{stroke:#a3adb9;stroke-width:3.2;stroke-linecap:round}.ladder-horizontal{stroke:#a3adb9;stroke-width:3.2;stroke-linecap:round}.trail-done{fill:none;stroke:#b3dfd6;stroke-width:6;stroke-linecap:round;stroke-linejoin:round;opacity:.88}.trail-active{fill:none;stroke:#0f766e;stroke-width:6.8;stroke-linecap:round;stroke-linejoin:round;filter:drop-shadow(0 0 3px rgba(15,118,110,.17))}.results-row{margin-bottom:9px}.result-cell{min-height:50px;display:flex;align-items:center;justify-content:center;text-align:center;padding:5px 2px;margin:0 4px;border-radius:9px;border:1px solid #e4eaf1;background:#f3f6f9;overflow-wrap:anywhere;line-height:1.3;font-size:13px;font-weight:850}.result-cell.question{font-size:22px;color:#9aabb8}.result-cell.revealed{color:var(--teal-dark);background:#e2f4ee;border-color:#b2e0d4}.result-cell.win{color:#98600c;background:#fff3d9;border-color:#f3d28b}.board-underbar{display:flex;justify-content:space-between;align-items:center;gap:8px;min-height:42px;padding:7px 14px;background:#fbfcfd;border-top:1px solid var(--line)}.scroll-tip{color:#8794a3;font-size:11px}.btn-compact{padding:6px 12px;min-height:31px;font-size:12px}.game-actions{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:20px}.btn-main{min-height:51px;font-size:14px}.bottom-controls{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:18px}.save-note{color:#8290a0;font-size:11px;display:flex;align-items:center;gap:6px}.save-note svg{height:14px;width:14px;color:#15a687}.sound-switch{border:0;background:transparent;color:#74849a;display:flex;align-items:center;gap:7px;font-size:12px;padding:8px}.sound-switch strong{color:var(--teal)}.sound-switch[aria-pressed=false] strong{color:#8a9ca7}.outcome-summary{margin-top:23px;padding:20px;background:#f7fbfa;border:1px solid #dceee9;border-radius:13px}.outcome-summary h3{margin:0 0 12px;font-size:17px}.summary-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:8px}.summary-item{display:flex;justify-content:space-between;gap:9px;background:white;border:1px solid var(--line);border-radius:9px;padding:10px 12px;font-size:13px}.summary-item b{color:var(--teal-dark)}.content-section{padding:53px 0 0}.section-heading{text-align:center;margin-bottom:22px}.section-heading h2{margin:5px 0;font-size:24px;letter-spacing:-.04em}.how-grid,.use-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.how-card,.use-item{background:white;border:1px solid var(--line);border-radius:15px;padding:19px}.how-number{font-weight:900;color:#19a18e;font-size:22px}.how-card h3,.use-item h3{font-size:15px;margin:7px 0}.how-card p,.use-item p{font-size:12px;color:var(--muted);margin:0}.use-item{display:flex;gap:10px;align-items:center}.use-item>span{font-size:27px}.faq-section details{background:white;border:1px solid var(--line);padding:14px 18px;border-radius:11px;margin-bottom:8px}.faq-section summary{font-size:14px;font-weight:800;cursor:pointer}.faq-section details p{font-size:13px;color:var(--muted)}.footer{margin-top:70px;border-top:1px solid var(--line);padding:25px 0 35px;display:flex;justify-content:space-between;gap:10px;color:#8794a3;font-size:11px}
.app-dialog{width:min(calc(100% - 22px),510px);max-height:min(90dvh,840px);border:1px solid #dce7e7;border-radius:20px;box-shadow:0 35px 100px rgba(8,29,35,.25);background:white;padding:0;color:var(--ink)}.app-dialog::backdrop{background:rgba(17,29,42,.55);backdrop-filter:blur(3px)}.dialog-head{display:flex;align-items:center;justify-content:space-between;padding:22px 25px 12px}.dialog-head h2{font-size:23px;letter-spacing:-.04em;margin:3px 0}.icon-button{border:0;background:#f2f5f7;border-radius:50%;height:37px;width:37px;font-size:23px;color:#59677b}.settings-dialog{overflow:hidden;flex-direction:column}.settings-dialog[open]{display:flex}.settings-body{overflow-y:auto;min-height:0;padding:3px 25px 16px;overscroll-behavior:contain}.setting-heading{display:flex;justify-content:space-between;align-items:center;gap:10px;margin:18px 0 10px}.setting-heading h3{font-size:14px;margin:0}.field-note{font-size:11px;color:#8695a5}.counter-wrap{display:flex;justify-content:center;align-items:center;gap:23px;background:#f7fafb;border-radius:11px;padding:11px}.counter-btn{border:1px solid #c9e0dc;background:white;border-radius:9px;width:41px;height:41px;font-weight:800;color:var(--teal);font-size:22px}.counter-wrap strong{min-width:72px;text-align:center;font-size:25px}.counter-wrap small{font-size:13px}.input-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.input-wrap{display:flex;align-items:center;gap:8px;border:1px solid #d9e3eb;border-radius:9px;padding:4px 10px;background:white;min-width:0}.input-wrap span{color:#8693a1;font-size:11px;white-space:nowrap}.input-wrap input{min-width:0;width:100%;padding:9px 0;border:0;outline:0;font-size:14px;color:var(--ink)}.input-wrap:focus-within{border-color:var(--teal);box-shadow:0 0 0 2px rgba(15,118,110,.1)}.mode-tabs{display:grid;grid-template-columns:repeat(3,1fr);gap:6px}.mode-tabs button{min-height:42px;background:#f5f8fa;border:1px solid #dfe8ed;border-radius:9px;font-weight:700;color:#617084;font-size:11px;padding:5px 2px}.mode-tabs button[aria-pressed=true]{color:var(--teal);background:#e9f8f3;border-color:#87cec2}.winner-options{margin-top:12px;display:flex;justify-content:space-between;align-items:center;background:#fbf9f3;padding:9px 12px;border-radius:10px;color:#7a6233;font-size:13px}.mini-counter{display:flex;align-items:center;gap:10px}.mini-counter button{height:30px;width:30px;border-radius:7px;border:1px solid #e4d7b8;background:white;color:#95721e;font-size:17px}.mini-counter strong{min-width:35px;text-align:center}.form-tip{font-size:11px;color:#82909e;margin-bottom:4px}.dialog-actions{background:white;border-top:1px solid var(--line);padding:14px 25px 20px;display:grid;grid-template-columns:1fr 1.4fr;gap:10px}.result-dialog,.confirm-dialog{text-align:center;padding:34px 28px 27px;max-width:400px;overflow:visible}.result-confetti{color:#e8a326;font-size:28px;letter-spacing:16px;line-height:1.2}.result-icon{font-size:46px;margin:8px}.result-dialog h2{margin:7px 0;color:#647489;font-size:19px}.result-value{font-size:clamp(26px,7vw,36px);font-weight:900;letter-spacing:-.04em;color:var(--teal);overflow-wrap:anywhere;line-height:1.4}.result-dialog.is-win .result-value{color:#bb7906}.result-help{color:#8792a0;font-size:12px;margin:12px 0 24px}.btn-result{min-width:210px;min-height:49px}.confirm-icon{margin:0 auto 12px;display:grid;place-items:center;width:48px;height:48px;background:#fff1dd;border-radius:50%;color:#a8781d;font-size:27px;font-weight:800}.confirm-dialog h2{font-size:22px;margin:4px 0}.confirm-dialog p{color:#647287;font-size:14px}.confirm-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:25px}
@media(max-width:600px){.page-wrap{padding:0 12px}.site-header{height:65px}.brand{font-size:19px}.brand img{width:35px;height:35px}.header-note{font-size:10px;padding:6px 9px}.intro{padding:30px 5px 22px}.intro h1{font-size:28px}.intro p{font-size:12px}.game-shell{border-radius:17px;padding:17px 13px 18px}.game-header h2{font-size:20px}.btn-setting{font-size:11px;padding:7px 10px;min-height:39px;gap:5px}.btn-setting svg{width:15px;height:15px}.hint-line{margin:17px 0 10px;font-size:12px}.board-topline{padding:10px;font-size:11px}.board-scroll{padding:16px 6px 5px}.amida-svg{height:360px}.name-button{font-size:11px;min-height:46px}.result-cell{min-height:45px;font-size:12px}.game-actions{gap:8px;margin-top:14px}.btn-main{font-size:12px;padding:9px 5px;min-height:49px;gap:4px}.btn-main svg{width:15px}.bottom-controls{margin-top:10px}.save-note{font-size:10px}.content-section{padding-top:39px}.section-heading h2{font-size:21px}.how-grid{grid-template-columns:1fr;gap:9px}.how-card{padding:14px 17px}.how-number{font-size:18px}.how-card h3{margin:1px 0}.use-grid{grid-template-columns:1fr}.use-item{padding:13px 18px}.footer{margin-top:40px}.settings-body{padding:2px 17px 11px}.dialog-head{padding:17px 17px 6px}.dialog-actions{padding:11px 17px 15px}.mode-tabs button{font-size:10px}.input-wrap{padding:3px 7px}.input-wrap input{font-size:12px}}
@media(max-width:350px){.game-actions{grid-template-columns:1fr}.input-grid{grid-template-columns:1fr}.name-button{font-size:10px}.save-note{max-width:180px}.btn-setting{padding:6px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important}}
/* Phase 2: top-right language / parent-site links; settings-only sound control */
.header-actions{display:flex;align-items:center;gap:9px;flex-shrink:0}
.header-button{display:inline-flex;align-items:center;justify-content:center;gap:3px;min-height:38px;border:1px solid #d6e4e9;border-radius:10px;background:#fff;color:#334659;text-decoration:none;font-size:12px;font-weight:750;padding:7px 12px;white-space:nowrap;transition:background .15s,border-color .15s}
.header-button:hover{background:#effaf7;border-color:#a6d9d0}
.header-button:focus-visible{outline:3px solid #49b4ac;outline-offset:2px}
.lang-button{color:var(--teal);background:var(--teal-light);border-color:#c8e9e2;font-size:12px;min-width:48px}
.header-button strong{color:var(--teal)}
.bottom-controls{justify-content:flex-start}
.sound-setting{display:flex;align-items:center;justify-content:space-between;gap:10px;cursor:pointer;border:1px solid #dce7ea;background:#f8fbfb;border-radius:11px;padding:12px 14px;font-weight:750;font-size:13px}
.sound-setting>span:first-child{display:flex;align-items:center;gap:9px}
.sound-setting>span:first-child>span{color:var(--teal);font-size:21px}
.sound-setting input{position:absolute;opacity:0;width:1px;height:1px}
.setting-switch{position:relative;flex-shrink:0;width:45px;height:25px;background:#c9d4db;border-radius:20px;transition:background .15s}
.setting-switch:after{content:'';position:absolute;top:3px;left:3px;width:19px;height:19px;border-radius:50%;background:#fff;box-shadow:0 1px 3px #0002;transition:transform .15s}
.sound-setting input:checked+.setting-switch{background:var(--teal)}
.sound-setting input:checked+.setting-switch:after{transform:translateX(20px)}
.sound-setting input:focus-visible+.setting-switch{outline:3px solid #49b4ac;outline-offset:3px}
@media(max-width:600px){.header-actions{gap:6px}.header-button{min-height:34px;padding:5px 8px;font-size:10px;border-radius:9px}.tools-button{letter-spacing:-.02em}.lang-button{min-width:42px}}
@media(max-width:390px){.brand{font-size:17px;gap:5px}.brand img{width:29px;height:29px}.header-button{padding:5px 6px;font-size:9px}.lang-button{min-width:38px}.header-actions{gap:4px}}
@media(max-width:340px){.brand{font-size:15px}.brand img{width:27px;height:27px}.header-button{font-size:8px}}
/* Phase 3: legal pages, footer links and contact form */
.footer{align-items:center;flex-wrap:wrap}
.footer-links{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:13px}
.footer-links a{color:#526575;text-decoration:none;font-size:12px;font-weight:650}
.footer-links a:hover,.legal-page a:not(.btn):hover{text-decoration:underline;color:var(--teal)}
.contact-callout{margin:48px auto 0;background:#eaf7f4;border:1px solid #cce9e2;border-radius:17px;padding:22px 26px;display:flex;align-items:center;flex-wrap:wrap;gap:10px 22px}
.contact-callout h2{font-size:17px;margin:0;flex:1 1 230px}.contact-callout p{margin:0;font-size:13px;color:var(--muted);flex:1 1 235px}.contact-callout .btn{min-width:180px;color:var(--teal)}
.legal-page{max-width:820px;margin:34px auto 0;background:#fff;border:1px solid var(--line);border-radius:20px;padding:30px clamp(18px,4vw,42px);box-shadow:var(--shadow)}
.legal-page h1{font-size:clamp(25px,4vw,33px);letter-spacing:-.04em;margin:5px 0 7px}
.legal-page .lead{color:var(--muted);font-size:14px;margin:0 0 19px}
.legal-page h2{font-size:18px;margin:30px 0 10px;border-left:4px solid var(--teal);padding-left:11px}
.legal-page p,.legal-page li{font-size:14px;line-height:1.95;color:#34455a}
.legal-page ul{padding-left:24px}.legal-page li+li{margin-top:3px}
.legal-page a:not(.btn){color:#0c716c;overflow-wrap:anywhere}
.legal-page .date-line{font-size:12px;color:var(--muted);margin:0 0 18px}
.legal-page .back-link{margin-top:26px}
.contact-form{display:grid;gap:17px;margin:20px 0 0}
.contact-field{display:flex;flex-direction:column;gap:6px}
.contact-field label{font-size:14px;font-weight:750}
.contact-field input,.contact-field textarea{width:100%;padding:12px 13px;border:1px solid #cddae1;border-radius:10px;background:white;font:inherit;font-size:16px;color:var(--ink)}
.contact-field textarea{resize:vertical;min-height:180px}
.contact-field input:focus,.contact-field textarea:focus{border-color:var(--teal);outline:3px solid #d8f1eb}
.required-mark{font-size:11px;color:#9b3b27;background:#fff0ea;padding:2px 7px;border-radius:5px;margin-left:5px}
.optional-mark{font-size:11px;color:#66758b;background:#eef3f6;padding:2px 7px;border-radius:5px;margin-left:5px}
.field-hint{font-size:12px;color:var(--muted);margin:0}
.contact-submit{width:100%;max-width:260px;font-size:15px}
.form-message{border-radius:12px;border:1px solid #d7e9e3;background:#effaf6;color:#125e4f;padding:12px 15px;font-size:14px}
.form-message.error{background:#fff4ef;border-color:#f2c6b4;color:#973a25}
.contact-footer-note{color:var(--muted);font-size:12px}
.contact-honeypot{position:absolute!important;left:-99999px!important;height:1px!important;width:1px!important;overflow:hidden!important}
@media(max-width:600px){.legal-page{margin-top:20px;padding:20px 16px;border-radius:14px}.contact-callout{padding:19px}.footer{justify-content:center;text-align:center}.footer-links{order:3;width:100%}}

/* Phase 4: compact, keyboard-accessible share tools */
.share-section{margin:19px 0 0;border:1px solid #d7e9e5;border-radius:18px;background:linear-gradient(115deg,#f3fbf8,#fff);padding:22px 24px;display:flex;align-items:center;gap:13px 22px;flex-wrap:wrap}
.share-copy{flex:1 1 260px}.share-copy h2{font-size:17px;margin:2px 0 4px;color:var(--ink)}.share-copy p{font-size:12px;line-height:1.7;margin:0;color:var(--muted)}
.share-actions{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end}.share-button{appearance:none;display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:42px;border:1px solid #d2e1e4;border-radius:10px;background:white;color:#33485d;font:inherit;font-size:12px;font-weight:800;text-decoration:none;padding:7px 13px;cursor:pointer;transition:transform .15s,background .15s,border-color .15s}
.share-button:hover{background:#e8f6f2;border-color:#89cbbd;transform:translateY(-1px)}.share-button:focus-visible{outline:3px solid #49b4ac;outline-offset:2px}
.share-button svg{width:16px;height:16px;stroke:currentColor;stroke-width:1.8;fill:none;stroke-linejoin:round;stroke-linecap:round}.share-symbol{font-size:17px;font-weight:950;line-height:1}.share-facebook .share-symbol{color:#1877f2;font-family:Arial,sans-serif;font-size:21px}.share-line-symbol{display:grid;place-items:center;border-radius:5px;background:#06c755;color:white;font-size:8px;width:24px;height:22px;letter-spacing:-.05em}
.share-feedback{width:100%;font-size:12px;color:#0c766d;min-height:0}.share-feedback:empty{display:none}
@media(max-width:650px){.share-section{padding:16px;gap:12px}.share-actions{justify-content:flex-start;width:100%;display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}.share-button{padding:8px 6px;min-width:0}.share-copy{flex-basis:100%}}