body{font-family:sans-serif;background:#f4f4f4;padding:0;margin:0}:root{--color-bg-light: #f5f9ff;--color-primary: #4a5fc1;--color-accent: #b9c6ff;--color-text: #333;--radius-lg: .625rem;--shadow-sm: 0 .2rem .6rem rgba(0, 0, 0, .06);--spacing-xs: .5rem;--spacing-sm: 1rem;--spacing-md: 1.5rem;--spacing-lg: 2rem}.app-container{min-height:100vh;display:flex;flex-direction:column;align-items:center;background:var(--color-bg-light);color:var(--color-text);font-family:system-ui,Arial,sans-serif;padding-inline:var(--spacing-sm)}.app-header{width:100%;text-align:center;padding-block:var(--spacing-lg);background-color:var(--color-primary);color:#fff;border-bottom:.25rem solid var(--color-accent)}.title{font-size:clamp(1.6rem,4vw,2.2rem);margin-bottom:var(--spacing-xs);letter-spacing:.5px}.subtitle{font-size:clamp(.9rem,2.5vw,1.1rem);opacity:.95}.content{width:min(100%,56rem);margin-top:var(--spacing-lg);padding:var(--spacing-md);background:#fff;border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);transition:border-radius .2s ease}@media (max-width: 768px){.content{padding:var(--spacing-sm)}}@media (max-width: 480px){.app-header{padding-block:var(--spacing-md)}.content{margin-top:var(--spacing-md)}}.booklist-section{display:flex;flex-direction:column;align-items:center;gap:16px;padding:1rem}.add-book-btn{background-color:var(--primary-blue);color:#fff;border:none;padding:10px 14px;font-size:1rem;border-radius:6px;cursor:pointer;transition:.2s ease}.add-book-btn:hover{background-color:var(--accent-blue)}.booklist{list-style:none;padding:0;width:100%}.booklist-item{background-color:#fff;padding:14px 16px;margin-bottom:12px;border-radius:8px;border-left:5px solid var(--primary-blue);box-shadow:0 2px 8px #0000000d;transition:transform .15s ease,box-shadow .15s ease}.booklist-item:hover{transform:translateY(-2px);box-shadow:0 4px 14px #0000001a}@media (max-width: 600px){.add-book-btn{width:100%}.booklist-item{padding:12px}}.modal-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#00000073;display:flex;justify-content:center;align-items:center;padding:1rem}.modal-content{background:#fff;width:100%;max-width:400px;padding:1.5rem;border-radius:12px;box-shadow:0 6px 15px #00000026}label{display:block;font-weight:600;margin-top:12px}input,textarea{width:100%;padding:8px;margin-top:6px;border:1px solid #ccc;border-radius:6px}textarea{resize:vertical;min-height:70px}.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:1.2rem}.confirm-btn,.cancel-btn{cursor:pointer;border:none;padding:10px 14px;border-radius:6px;font-weight:600}.confirm-btn{background-color:#4a5fc1;color:#fff}.confirm-btn:hover{background-color:#3f53aa}.cancel-btn{background-color:#e5e7eb}.cancel-btn:hover{background-color:#d1d5db}.required,.error-text{color:red}:root{--primary-blue: #4a5fc1;--accent-blue: #b9c6ff;--bg-light: #f5f9ff;--text-dark: #333}.book-card{display:flex;align-items:flex-start;gap:14px}.book-image{width:80px;height:110px;object-fit:cover;border-radius:6px;background-color:var(--accent-blue)}.book-info{flex:1}.book-title{margin:0 0 6px;font-size:1.1rem;color:var(--text-dark)}.toggle-btn{background-color:var(--primary-blue);color:#fff;border:none;padding:6px 10px;font-size:.85rem;border-radius:6px;cursor:pointer;margin-bottom:8px;transition:.2s}.toggle-btn:hover{background-color:var(--accent-blue)}.book-desc{font-size:.9rem;margin:0;background-color:var(--bg-light);padding:8px;border-radius:6px}@media (max-width: 600px){.book-card{flex-direction:column;align-items:center;text-align:center}.book-image{width:100px;height:140px}.toggle-btn{width:100%}}