:root{--c-bg:#f5f4f0;--c-surface:#ffffff;--c-border:#e0dbd2;--c-border-dark:#b8b1a6;--c-text:#1c1b18;--c-text-muted:#78726a;--c-accent:#1a4a6b;--c-accent-lt:#e8eff5;--c-accent2:#c8860a;--c-accent2-lt:#fdf3e0;--c-row-hover:#f0f3f7;--c-header-bg:#0f2d45;--font-ui:'Noto Sans JP', 'Helvetica Neue', Arial, sans-serif;--radius:3px;--shadow:0 2px 10px rgba(0,0,0,.07)}*,::after,::before{box-sizing:border-box;margin:0;padding:0}html{font-size:15px;scroll-behavior:smooth}body{font-family:var(--font-ui);background:var(--c-bg);color:var(--c-text);line-height:1.6;-webkit-font-smoothing:antialiased}a{color:var(--c-accent);text-decoration:none}a:hover{text-decoration:underline}.site-wrapper{display:flex;flex-direction:column;min-height:100vh}.site-main{flex:1;width:100%;max-width:1400px;margin:0 auto;padding:1.75rem 1.25rem 4rem}.site-header{background:var(--c-header-bg);color:#fff;padding:.8rem 1.25rem;display:flex;align-items:baseline;gap:1rem}.site-title{font-size:1rem;font-weight:700;letter-spacing:.04em}.site-title a{color:#fff}.site-header-btn,.site-title a:hover{color:#8ab4d0;text-decoration:none}.site-header-btn{margin-left:auto;display:inline-flex;align-items:center;padding:.3rem .85rem;border:1px solid rgb(255 255 255/.5);border-radius:var(--radius);color:#fff;font-size:.75rem;font-weight:600;white-space:nowrap;transition:background .15s,border-color .15s}.site-header-btn:hover{background:rgb(255 255 255/.12);border-color:#fff;text-decoration:none;color:#fff}.site-footer{background:var(--c-header-bg);color:#5a7a90;text-align:center;font-size:.72rem;padding:.7rem}.back-link,.single-placeholder{border:1px solid var(--c-border);border-radius:var(--radius)}.single-placeholder{background:var(--c-surface);padding:2rem;max-width:640px}.single-placeholder h1{font-size:1.25rem;margin-bottom:1rem}.back-link{display:inline-flex;align-items:center;gap:.35rem;font-size:.82rem;color:var(--c-text-muted);padding:.35rem .75rem;margin-bottom:1.25rem;transition:background .12s}.back-link:hover{background:var(--c-accent-lt);color:var(--c-accent);text-decoration:none}