:root{--bg-color:#e5e9f0;--card-bg:#f1f4f9;--card-bg-hover:#fff;--card-border:#cbd5e1;--card-border-hover:#2563eb;--card-shadow:0 1px 3px rgba(15,23,42,.06);--card-shadow-hover:0 6px 16px rgba(15,23,42,.12);--text-primary:#0f172a;--text-secondary:#334155;--text-muted:#64748b;--accent-color:#2563eb;--accent-hover:#1d4ed8;--search-bg:#f8fafc;--search-border:#cbd5e1;--search-border-focus:#2563eb;--radius-sm:6px;--radius-md:10px;--radius-lg:14px;--font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans JP",sans-serif;--transition:all 0.2s cubic-bezier(0.4,0,0.2,1)}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-primary);font-family:var(--font-family);min-height:100vh;align-items:center;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.tethys-container,body{display:flex;flex-direction:column}.tethys-container{width:100%;max-width:1200px;padding:64px 24px 80px;gap:36px}.tethys-header{text-align:center;display:flex;flex-direction:column;align-items:center;gap:10px}.tethys-badge{font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.08em;padding:4px 10px;border-radius:9999px;background:rgba(37,99,235,.08);color:var(--accent-color);border:1px solid rgba(37,99,235,.2)}.tethys-title{font-size:2.25rem;font-weight:700;letter-spacing:-.02em;color:var(--text-primary)}.tethys-subtitle{font-size:1rem;color:var(--text-secondary)}.search-wrapper{position:relative;width:100%;max-width:720px;margin:0 auto}.search-input-box{width:100%;height:52px;background-color:var(--search-bg);border:1px solid var(--search-border);border-radius:var(--radius-lg);padding:0 48px;font-size:1.05rem;color:var(--text-primary);outline:none;transition:var(--transition);box-shadow:0 2px 8px rgba(0,0,0,.04)}.search-input-box::placeholder{color:var(--text-muted)}.search-input-box:focus{border-color:var(--search-border-focus);box-shadow:0 0 0 3px rgba(37,99,235,.15),0 4px 16px rgba(0,0,0,.06)}.search-icon{left:16px;pointer-events:none}.search-clear-btn,.search-icon{position:absolute;top:50%;transform:translateY(-50%);color:var(--text-muted);display:flex;align-items:center;justify-content:center}.search-clear-btn{right:14px;background:none;border:none;cursor:pointer;padding:6px;border-radius:50%;transition:var(--transition)}.search-clear-btn:hover{color:var(--text-primary);background-color:rgba(0,0,0,.06)}.search-meta{display:flex;justify-content:space-between;align-items:center;padding:0 4px;font-size:.875rem;color:var(--text-secondary)}.book-grid{display:grid;grid-template-columns:repeat(2,1fr);grid-gap:20px;gap:20px;list-style:none}@media (max-width:640px){.book-grid{grid-template-columns:1fr}}.book-card,.book-grid>li{display:flex}.book-card{background-color:var(--card-bg);border:1px solid var(--card-border);border-radius:var(--radius-md);padding:16px 20px;width:100%;height:96px;align-items:center;justify-content:space-between;gap:16px;transition:var(--transition);box-shadow:var(--card-shadow)}.book-card:hover{background-color:var(--card-bg-hover);border-color:var(--card-border-hover);transform:translateY(-2px);box-shadow:var(--card-shadow-hover)}.book-card-main{text-decoration:none;color:inherit;display:flex;align-items:center;gap:14px;flex:1 1;min-width:0;height:100%;outline:none}.book-card-main:focus-visible{outline:2px solid var(--accent-color);border-radius:var(--radius-sm)}.book-icon{color:var(--accent-color);flex-shrink:0;display:flex;align-items:center;justify-content:center}.book-card-title{font-size:1.05rem;font-weight:600;line-height:1.45;color:var(--text-primary);overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}.book-card-actions{display:flex;align-items:center;gap:10px;flex-shrink:0}.book-pdf-btn{display:inline-flex;align-items:center;gap:5px;padding:5px 10px;background-color:rgba(220,38,38,.08);border:1px solid rgba(220,38,38,.25);border-radius:var(--radius-sm);color:#dc2626;font-size:.75rem;font-weight:700;letter-spacing:.04em;text-decoration:none;transition:var(--transition);cursor:pointer;white-space:nowrap}.book-pdf-btn:hover{background-color:#dc2626;border-color:#dc2626;color:#fff;transform:translateY(-1px);box-shadow:0 2px 8px rgba(220,38,38,.25)}.book-card-main:hover .book-card-title{color:var(--accent-color)}.empty-state{text-align:center;padding:64px 16px;display:flex;flex-direction:column;align-items:center;gap:16px;color:var(--text-secondary)}.empty-state-icon{color:var(--text-muted)}.empty-state-text{font-size:1.1rem}.empty-state-reset-btn{background-color:var(--card-bg);border:1px solid var(--card-border);color:var(--accent-color);padding:8px 18px;border-radius:var(--radius-sm);font-size:.9rem;cursor:pointer;transition:var(--transition);box-shadow:var(--card-shadow)}.empty-state-reset-btn:hover{background-color:var(--card-bg-hover);border-color:var(--accent-color)}