.oi-doc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-bottom:50px}.oi-doc-card{background:var(--bg);border:1px solid var(--border);border-radius:20px;padding:30px 26px;transition:all 0.4s ease;display:flex;flex-direction:column;gap:14px}.oi-doc-card:hover{box-shadow:var(--shadow-md);transform:translateY(-6px);border-color:var(--teal);border-bottom:3px solid var(--teal)}.oi-doc-header{display:flex;gap:14px;align-items:flex-start}.oi-doc-icon{font-size:2rem;line-height:1;flex-shrink:0}.oi-doc-tag{font-family:'Space Mono',monospace;font-size:0.55rem;letter-spacing:0.18em;color:var(--teal);text-transform:uppercase;display:block;margin-bottom:4px}.oi-doc-card h4{font-family:'Playfair Display',serif;font-size:1.1rem;font-weight:400;color:var(--text);line-height:1.3}.oi-doc-card>p{font-family:'DM Sans',sans-serif;font-size:0.92rem;color:var(--text-2);line-height:1.75;flex:1}.oi-doc-how{background:var(--teal-light);border-radius:12px;padding:14px 16px;border-left:3px solid var(--teal);margin-top:auto}.oi-doc-how strong{font-family:'Space Mono',monospace;font-size:0.62rem;letter-spacing:0.1em;color:var(--teal);text-transform:uppercase;display:block;margin-bottom:6px}.oi-doc-how p{font-family:'DM Sans',sans-serif;font-size:0.88rem;color:var(--text-2);line-height:1.65;margin:0}.oi-doc-cta{background:linear-gradient(135deg,var(--text) 0%,#2a2a4e 100%);border-radius:24px;padding:44px 48px;display:flex;align-items:center;justify-content:space-between;gap:30px;overflow:hidden;position:relative}.oi-doc-cta::before{content:'書';position:absolute;right:180px;top:50%;transform:translateY(-50%);font-family:'Noto Serif JP',serif;font-size:160px;color:rgba(255,255,255,0.03);pointer-events:none}.oi-doc-cta-text h3{font-family:'Playfair Display',serif;font-size:1.5rem;font-weight:300;color:#fff;margin-bottom:8px}.oi-doc-cta-text p{font-family:'DM Sans',sans-serif;font-size:0.95rem;color:rgba(255,255,255,0.6)}.oi-doc-cta-btn{display:inline-block;padding:14px 32px;background:var(--teal);color:#fff;font-family:'Space Mono',monospace;font-size:0.72rem;letter-spacing:0.15em;border-radius:40px;text-decoration:none;text-transform:uppercase;white-space:nowrap;transition:all 0.3s;flex-shrink:0}.oi-doc-cta-btn:hover{background:var(--coral);transform:translateY(-3px);box-shadow:0 10px 30px rgba(231,111,81,0.4)}