:root{--ink:#1a1a18;--paper:#f7f5f0;--accent:#2a5c45;--accent-light:#e8f0ec;--accent-mid:#4a8c6a;--warm:#c8a96e;--warm-light:#faf6ee;--border:#d4cfc4;--muted:#7a7770;--danger:#c0392b;--font-body:"Hiragino Kaku Gothic ProN","Hiragino Sans","Noto Sans JP","Yu Gothic","Meiryo",sans-serif;--font-serif:"Hiragino Mincho ProN","Hiragino Mincho Pro","Yu Mincho","HG Mincho E",serif;--font-mono:"Menlo","Monaco","Consolas","Courier New",monospace}*,:after,:before{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-body);background:var(--paper);color:var(--ink);font-size:15px;line-height:1.7}.main-wrap{max-width:780px;margin:0 auto;padding:2.5rem 1.5rem}.nav-link{font-size:13px;color:var(--muted);padding:.35rem .7rem;border-radius:6px;text-decoration:none;transition:background .15s}.nav-link:hover{background:var(--accent-light);color:var(--accent)}.btn{display:inline-flex;align-items:center;gap:6px;padding:.65rem 1.3rem;border-radius:8px;font-size:13px;font-weight:700;cursor:pointer;border:none;transition:all .15s;font-family:var(--font-body);text-decoration:none}.btn-primary{background:var(--accent);color:white}.btn-primary:hover:not(:disabled){background:#234d3a}.btn-primary:disabled{background:var(--border);color:var(--muted);cursor:not-allowed}.btn-ghost{background:transparent;color:var(--muted);border:1px solid var(--border)}.btn-sm{padding:.4rem .85rem;font-size:12px}.btn-row{gap:10px;margin-top:1.25rem}.btn-row,.site-header{display:flex;align-items:center}.site-header{justify-content:space-between;padding:.75rem 1.5rem;background:white;border-bottom:1px solid var(--border);position:-webkit-sticky;position:sticky;top:0;z-index:100;gap:1rem}.nav-links{display:flex;align-items:center;gap:.25rem;flex-wrap:wrap}.logo-text{font-size:1.1rem;font-weight:700;color:var(--ink);letter-spacing:-.3px}.header-right{display:flex;align-items:center;gap:.5rem;flex-shrink:0}