:root{--font-display:"Hiragino Mincho ProN","Yu Mincho",YuMincho,"Noto Serif JP",serif;--font-body:"Hiragino Kaku Gothic ProN","Hiragino Sans","Noto Sans JP","BIZ UDPGothic","Yu Gothic","Meiryo",system-ui,sans-serif;--radius-card:3px;--radius-control:2px;--shadow-card:none;--shadow-soft:none;--color-surface:#ffffff;--color-bg:var(--color-paper);--color-border:var(--rule-hair);--color-danger:#9d2f28;--frame-width:42rem;--frame-pad-x:1rem;--frame-pad-y:1.5rem;--text-xs:0.75rem;--text-sm:0.875rem;--text-base:1rem;--text-lg:1.125rem;--text-xl:1.25rem;--text-2xl:1.5rem;--text-3xl:1.875rem;--text-4xl:2.5rem;--rule-hair:#d5dae0;--rule-ink:#1f2933;--color-paper:#eef0f3;--color-text:#1f2933;--color-muted:#5f6b76;--color-brand:#1f4e79;--color-brand-strong:#173a5a;--color-brand-soft:#e3eaf1;--grid-line:rgba(40,60,90,0.05);--grid-line-faint:rgba(40,60,90,0.04)}*,:after,:before{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body,html{margin:0;background:var(--color-bg);color:var(--color-text);font-family:var(--font-body);font-size:18px;line-height:1.9;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}body{overflow-x:hidden;background-image:repeating-linear-gradient(to bottom,transparent 0 21px,var(--grid-line) 21px 22px),repeating-linear-gradient(to right,transparent 0 21px,var(--grid-line-faint) 21px 22px);background-attachment:fixed;overflow-wrap:anywhere;word-break:normal}h1,h2,h3{font-family:var(--font-display);font-weight:600;letter-spacing:.04em;line-height:1.55}h1{padding-bottom:4px;border-bottom:2px solid var(--color-brand);display:inline-block}.tabular,table{font-feature-settings:"tnum";font-variant-numeric:tabular-nums}a,button,input,select,textarea{font:inherit;transition:background-color .18s ease,border-color .18s ease,opacity .18s ease}a.btn,a[role=button],button{min-height:44px}input,select,textarea{font-size:max(16px,1rem);max-width:100%;border-radius:var(--radius-control)}@media (max-width:600px){input,select,textarea{font-size:16px!important}}:focus-visible{outline:none;box-shadow:0 0 0 2px var(--color-surface),0 0 0 3px var(--color-brand);border-radius:2px}::selection{background:var(--color-brand-soft)}canvas,img,svg,video{max-width:100%;height:auto}table{max-width:100%}pre{overflow-x:auto}:where(.wrap-row){flex-wrap:wrap}:where(.frame-nav,nav) a,:where(.frame-nav,nav) a>span:last-child{min-width:0}:where(button,a.btn){height:auto}:where(.frame-nav) a,:where(nav[aria-label]) a{text-align:center;line-height:1.3;padding-inline:2px}.app-header{position:-webkit-sticky;position:sticky;top:0;z-index:10;background:rgba(255,255,255,.9);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--rule-hair)}.app-header-inner{max-width:var(--frame-width);margin:0 auto;padding:.75rem var(--frame-pad-x);display:flex;align-items:center;gap:.75rem}.app-brand{display:inline-flex;align-items:baseline;gap:.45em;text-decoration:none;min-height:0}.app-brand-ja{font-family:var(--font-display);font-size:1.35rem;font-weight:700;letter-spacing:.04em;color:var(--color-brand)}.app-brand-en{font-size:.9rem;font-weight:400;letter-spacing:.08em;color:var(--color-muted)}.app-header-right{margin-left:auto;display:flex;align-items:center;gap:.75rem}.app-greeting{font-size:1rem;color:var(--color-muted)}@media (max-width:480px){.app-greeting{display:none}}.app-menu-btn{padding:.5rem .75rem;border:none;background:transparent;border-radius:var(--radius-control);font-size:1.25rem;color:var(--color-text);cursor:pointer}.app-menu-btn:hover{background:rgba(0,0,0,.05)}:where(div,section,article,main,aside,header,footer,nav,ul,ol,li,p,form,label,fieldset){min-width:0}.loading-block{border-radius:var(--radius-card);background:linear-gradient(90deg,var(--color-paper) 25%,#ffffff 37%,var(--color-paper) 63%);background-size:400% 100%;animation:loading-sheen 1.4s ease-in-out infinite}@keyframes loading-sheen{0%{background-position:100% 50%}to{background-position:0 50%}}@media (prefers-reduced-motion:reduce){a,button,input,select,textarea{transition:none}.loading-block{animation:none}}.tour-spot{transition:top .28s cubic-bezier(.22,1,.36,1),left .28s cubic-bezier(.22,1,.36,1),width .28s cubic-bezier(.22,1,.36,1),height .28s cubic-bezier(.22,1,.36,1)}.tour-bubble{animation:tour-pop .3s cubic-bezier(.22,1,.36,1);transition:top .28s cubic-bezier(.22,1,.36,1),left .28s cubic-bezier(.22,1,.36,1)}.tour-emoji{display:inline-block;animation:tour-nudge 2.4s ease-in-out infinite}@keyframes tour-pop{0%{opacity:0;transform:translateY(8px) scale(.96)}to{opacity:1;transform:none}}@keyframes tour-nudge{0%,70%,to{transform:none}80%{transform:translateY(-3px) rotate(-6deg)}90%{transform:translateY(-1px) rotate(3deg)}}@media (prefers-reduced-motion:reduce){.tour-bubble,.tour-spot{transition:none}.tour-bubble,.tour-emoji{animation:none}}