:root{--bg: #fafbfc;--surface: #ffffff;--ink: #111827;--ink-soft: #5b6478;--muted: #6b7280;--border: #e3e8f2;--brand: #4f46e5;--brand-hover: #4338ca;--shadow-soft: 0 16px 36px rgba(15, 23, 42, .09);--shadow-card: 0 10px 24px rgba(15, 23, 42, .08);--font-ui: "Inter", "Nunito", "Noto Sans JP", "Hiragino Sans", "Yu Gothic", system-ui, sans-serif;--radius: 16px;--radius-sm: 10px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-family:var(--font-ui);color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{min-height:100dvh}.page{max-width:720px;margin:0 auto;padding:0 16px 32px;display:flex;flex-direction:column;min-height:100dvh}.app-header{display:flex;align-items:center;justify-content:space-between;padding:16px 0;gap:12px;flex-wrap:wrap}.app-header-left{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.brand-mark{display:flex;align-items:center;gap:6px;text-decoration:none;color:var(--brand);font-weight:800;font-size:1rem}.brand-logo{width:28px;height:28px}.app-header-title{font-family:"Nunito",var(--font-ui);font-size:clamp(1.1rem,3vw,1.4rem);font-weight:800;color:var(--ink)}.locale-select-wrap{display:flex;align-items:center;gap:6px}.locale-select-label{font-size:.8rem;color:var(--muted)}.locale-select{font-family:var(--font-ui);font-size:.85rem;padding:6px 10px;border:1.5px solid var(--border);border-radius:8px;background:var(--surface);color:var(--ink);cursor:pointer;min-height:36px}.locale-select:focus-visible{outline:2px solid var(--brand);outline-offset:2px}.main-content{flex:1}.number-line-wrap{padding:8px 0 16px}.number-line-controls{display:flex;align-items:center;justify-content:center;gap:16px;margin-bottom:16px}.selected-number{font-family:"Nunito",var(--font-ui);font-size:clamp(3rem,10vw,4.5rem);font-weight:800;color:var(--brand);line-height:1;min-width:80px;text-align:center}.adjust-btn{font-family:var(--font-ui);font-size:1.6rem;font-weight:700;width:64px;height:64px;border:2px solid var(--border);border-radius:50%;background:var(--surface);color:var(--ink);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .15s ease;box-shadow:0 2px 6px #0000000a}.adjust-btn:hover:not(:disabled){border-color:var(--brand);color:var(--brand);transform:translateY(-1px);box-shadow:var(--shadow-card)}.adjust-btn:active:not(:disabled){transform:scale(.95)}.adjust-btn:disabled{opacity:.35;cursor:not-allowed}.adjust-btn:focus-visible{outline:2px solid var(--brand);outline-offset:2px}.number-line-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:thin;padding:8px 0}.number-line-track{display:flex;align-items:flex-end;gap:0;position:relative;min-width:max-content;padding:0 16px}.number-line-bar{position:absolute;bottom:28px;left:16px;right:16px;height:4px;background:var(--border);border-radius:2px}.number-line-tick{display:flex;flex-direction:column;align-items:center;gap:4px;padding:8px 4px;min-width:44px;border:none;background:none;cursor:pointer;position:relative;font-family:var(--font-ui);transition:all .15s ease}.tick-mark{width:4px;height:20px;background:var(--border);border-radius:2px;transition:all .15s ease}.tick-label{font-size:.9rem;font-weight:600;color:var(--muted);transition:all .15s ease}.number-line-tick--active .tick-mark{background:var(--brand);height:28px;width:6px}.number-line-tick--active .tick-label{color:var(--brand);font-weight:800;font-size:1.1rem}.number-line-tick--highlight .tick-mark{background:#e11d48;height:24px;width:5px}.number-line-tick--highlight .tick-label{color:#e11d48;font-weight:700}.number-line-tick:hover .tick-mark{background:var(--brand)}.number-line-tick:hover .tick-label{color:var(--brand)}.number-line-tick:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:4px}.number-line-hint{text-align:center;font-size:.85rem;color:var(--muted);margin-top:8px}.dot-display{display:flex;flex-direction:column;align-items:center;gap:8px;padding:16px 0}.dot-display-label{font-family:"Nunito",var(--font-ui);font-size:1.1rem;font-weight:700;color:var(--ink)}.dot-svg{width:100%;max-width:280px}.dot{filter:drop-shadow(0 2px 4px rgba(0,0,0,.1));transition:all .2s ease}.compare-toggle-wrap{display:flex;justify-content:center;padding:8px 0 16px}.compare-toggle-btn{font-family:var(--font-ui);font-size:1rem;font-weight:700;padding:12px 28px;border:2px solid var(--brand);border-radius:12px;background:var(--surface);color:var(--brand);cursor:pointer;transition:all .15s ease;min-height:48px}.compare-toggle-btn:hover{background:var(--brand);color:#fff}.compare-toggle-btn:focus-visible{outline:2px solid var(--brand);outline-offset:2px}.compare-mode{padding:8px 0}.compare-header{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px;flex-wrap:wrap}.compare-selector{display:flex;gap:8px}.compare-tab{font-family:"Nunito",var(--font-ui);font-size:1.1rem;font-weight:700;padding:8px 20px;border:2px solid var(--border);border-radius:10px;background:var(--surface);color:var(--ink-soft);cursor:pointer;transition:all .15s ease;min-height:44px}.compare-tab--active{border-color:var(--brand);color:var(--brand);background:#eef2ff}.compare-exit-btn{font-family:var(--font-ui);font-size:.9rem;font-weight:600;padding:8px 16px;border:1.5px solid var(--border);border-radius:8px;background:var(--surface);color:var(--muted);cursor:pointer;min-height:40px}.compare-exit-btn:hover{color:var(--ink);border-color:var(--ink-soft)}.compare-instruction{text-align:center;font-size:.95rem;color:var(--ink-soft);margin-bottom:8px}.compare-result{text-align:center;padding:16px 0}.compare-result-text{font-family:"Nunito",var(--font-ui);font-size:clamp(1.2rem,4vw,1.6rem);font-weight:800;color:var(--brand)}.compare-dots{display:grid;grid-template-columns:1fr 1fr;gap:16px;padding:8px 0}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000073;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:100;padding:16px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-soft)}.app-modal{width:100%;max-width:480px;max-height:80vh;overflow-y:auto;padding:24px;animation:pop-in .2s ease}.app-modal-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.app-modal-header h2{font-size:1.2rem;font-weight:700}.app-modal-close{font-family:var(--font-ui);font-size:.85rem;padding:6px 14px;border:1.5px solid var(--border);border-radius:8px;background:var(--surface);color:var(--muted);cursor:pointer}.app-modal-body{font-size:.95rem;line-height:1.7;color:var(--ink-soft)}.app-modal-body p{margin-bottom:12px}.app-modal-body ol{padding-left:1.5em}.app-modal-body li{margin-bottom:8px}.app-modal-body a{color:var(--brand);text-decoration:underline}.site-footer{margin-top:auto;padding:24px 0 16px;border-top:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px}.site-footer-brand{display:flex;align-items:center;gap:12px}.site-footer-copy{font-size:.75rem;color:var(--muted)}.site-footer-links{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.site-footer-link,.site-footer-button{font-family:var(--font-ui);font-size:.8rem;color:var(--muted);text-decoration:none;background:none;border:none;cursor:pointer;padding:4px 0}.site-footer-link:hover,.site-footer-button:hover{color:var(--brand)}@keyframes pop-in{0%{opacity:0;transform:scale(.92)}to{opacity:1;transform:scale(1)}}@media (max-width: 480px){.selected-number{font-size:2.5rem}.adjust-btn{width:52px;height:52px;font-size:1.3rem}.compare-dots{grid-template-columns:1fr}.site-footer{flex-direction:column;align-items:flex-start}}