: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}.shape-grid-wrap{padding:8px 0 16px}.shape-grid-hint{text-align:center;font-size:.95rem;color:var(--muted);margin-bottom:16px}.shape-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.shape-card{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;padding:20px 12px;min-height:140px;border:2px solid var(--border);border-radius:var(--radius);background:var(--surface);cursor:pointer;transition:all .15s ease;box-shadow:0 2px 6px #0000000a;font-family:var(--font-ui)}.shape-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-card);border-color:var(--brand)}.shape-card:active{transform:scale(.97)}.shape-card:focus-visible{outline:2px solid var(--brand);outline-offset:2px}.shape-card-name{font-family:"Nunito",var(--font-ui);font-size:1rem;font-weight:700;color:var(--ink)}.shape-detail{padding:8px 0}.shape-detail-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.shape-detail-name{font-family:"Nunito",var(--font-ui);font-size:clamp(1.4rem,4vw,1.8rem);font-weight:800;color:var(--ink)}.shape-detail-back{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}.shape-detail-back:hover{color:var(--ink);border-color:var(--ink-soft)}.shape-detail-visual{display:flex;justify-content:center;padding:24px 0}.shape-detail-svg{filter:drop-shadow(0 4px 12px rgba(0,0,0,.12))}.shape-detail-rotate{display:flex;align-items:center;gap:12px;padding:8px 0 20px}.shape-detail-rotate-label{font-size:.9rem;font-weight:600;color:var(--ink-soft);white-space:nowrap}.shape-detail-slider{flex:1;height:6px;-webkit-appearance:none;-moz-appearance:none;appearance:none;background:var(--border);border-radius:3px;outline:none}.shape-detail-slider::-webkit-slider-thumb{-webkit-appearance:none;width:24px;height:24px;border-radius:50%;background:var(--brand);cursor:pointer;border:2px solid white;box-shadow:0 2px 6px #00000026}.shape-detail-slider::-moz-range-thumb{width:24px;height:24px;border-radius:50%;background:var(--brand);cursor:pointer;border:2px solid white;box-shadow:0 2px 6px #00000026}.shape-detail-rotate-value{font-size:.85rem;font-weight:600;color:var(--muted);min-width:40px;text-align:right}.shape-detail-info{display:grid;grid-template-columns:1fr 1fr;gap:12px}.info-card{display:flex;flex-direction:column;align-items:center;gap:6px;padding:16px 12px;background:var(--surface);border:1.5px solid var(--border);border-radius:var(--radius-sm);box-shadow:0 2px 6px #0000000a}.info-card-label{font-size:.85rem;color:var(--muted)}.info-card-value{font-family:"Nunito",var(--font-ui);font-size:clamp(1.6rem,5vw,2.2rem);font-weight:800;color:var(--brand)}.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){.shape-grid{grid-template-columns:repeat(2,1fr);gap:8px}.shape-card{min-height:120px;padding:14px 8px}.shape-detail-info{grid-template-columns:1fr 1fr}.site-footer{flex-direction:column;align-items:flex-start}}