:root{--bg-color: #f0f2f5;--card-bg-color: #ffffff;--text-color: #1c1e21;--text-secondary-color: #606770;--accent-color: #1877f2;--accent-color-hover: #166fe5;--border-color: #dddfe2;--input-bg-color: #f5f6f7;--error-bg-color: #f8d7da;--error-border-color: #f5c6cb;--error-text-color: #721c24;--button-secondary-bg: #e4e6eb;--button-secondary-hover: #d8dade;--button-secondary-text: #050505;--button-green-bg: #42b72a;--button-green-hover: #36a420}*,*:before,*:after{box-sizing:border-box}body{margin:0;font-family:Sarabun,sans-serif;background-color:var(--bg-color);color:var(--text-color);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;padding-bottom:90px}input,button,select,textarea{font-family:Sarabun,sans-serif}.container{min-height:100vh;display:flex;align-items:flex-start;justify-content:center;padding:1.5rem 1rem}.content-wrapper{width:100%;max-width:900px;margin:0 auto}.app-header{margin-bottom:2rem;display:flex;justify-content:flex-start;align-items:center;padding:0 .5rem}.title-group{text-align:left}.app-title{font-size:1.75rem;font-weight:700;color:var(--text-color);margin:0}.app-description{color:var(--text-secondary-color);margin:.25rem 0 0;font-size:1rem}.how-to-use-button{display:flex;align-items:center;gap:.5rem;background-color:var(--card-bg-color);border:1px solid var(--border-color);color:var(--text-secondary-color);padding:.5rem 1rem;border-radius:6px;font-size:.875rem;font-weight:500;cursor:pointer;transition:background-color .2s,color .2s}.how-to-use-button:hover{background-color:var(--input-bg-color);color:var(--text-color)}.how-to-use-button .icon{width:1.25rem;height:1.25rem}#epub-form{display:grid;gap:1.5rem;grid-template-columns:1fr}.form-section{background-color:var(--card-bg-color);padding:1.5rem;border-radius:8px;border:1px solid var(--border-color);box-shadow:0 1px 2px #0000001a}.section-title{font-size:1.125rem;font-weight:700;color:var(--text-color);margin:0 0 .25rem}.section-description{color:var(--text-secondary-color);font-size:.875rem;margin:0 0 1.25rem}.file-upload-wrapper{display:grid;gap:1rem}.form-label{display:block;font-size:.875rem;font-weight:500;color:var(--text-secondary-color);margin-bottom:.5rem}.file-upload-box{position:relative;display:flex;align-items:center;justify-content:center;width:100%;padding:1rem;min-height:100px;background-color:#f7f8fa;border:2px dashed var(--border-color);border-radius:8px;cursor:pointer;transition:background-color .2s ease-in-out,border-color .2s ease-in-out}.file-upload-box:hover,.file-upload-box.drag-over{background-color:#e9ecef}.file-upload-box.drag-over{border-color:var(--accent-color)}.file-upload-content{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;color:var(--text-secondary-color);width:100%;pointer-events:none}.file-upload-content.has-files{align-items:flex-start;text-align:left}.upload-icon{width:1.75rem;height:1.75rem;margin-bottom:.5rem}.file-upload-text{font-weight:500}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-width:0}.number-input,.select-input,.metadata-field input{display:block;width:100%;background-color:var(--input-bg-color);border:1px solid var(--border-color);border-radius:6px;padding:.6rem .75rem;color:var(--text-color);font-size:.9rem;transition:border-color .2s,box-shadow .2s}.number-input:focus,.select-input:focus,.metadata-field input:focus{outline:none;border-color:var(--accent-color);box-shadow:0 0 0 2px #1877f233}.select-input{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236c757d' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");background-position:right .5rem center;background-repeat:no-repeat;background-size:1.5em 1.5em;padding-right:2.5rem}.error-box{background-color:var(--error-bg-color);border:1px solid var(--error-border-color);color:var(--error-text-color);padding:.75rem 1rem;border-radius:6px;font-size:.875rem;margin-top:1rem}.error-box p{margin:0}.error-title{font-weight:700}.generate-button{width:100%;display:flex;align-items:center;justify-content:center;padding:.75rem 1.5rem;border:none;font-size:1rem;font-weight:500;border-radius:6px;color:#fff;background-color:var(--accent-color);cursor:pointer;transition:all .15s ease-in-out}.generate-button:hover:not(:disabled){background-color:var(--accent-color-hover)}.generate-button:focus{outline:none;box-shadow:0 0 0 2px #1877f24d}.generate-button:disabled{background-color:#adb5bd;cursor:not-allowed}.button-spinner{display:flex;align-items:center}.spinner{width:1.25rem;height:1.25rem;margin-right:.75rem;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.app-footer{text-align:center;margin-top:2rem}.app-footer p{font-size:.875rem;color:var(--text-secondary-color)}.file-list-container{width:100%;text-align:left;max-height:150px;overflow-y:auto;padding:.5rem;background-color:#fff;border-radius:6px;pointer-events:all}.file-list-header{display:flex;justify-content:space-between;align-items:center;width:100%;margin:0 0 .5rem;padding:0 .25rem;pointer-events:all}.file-list-title{font-weight:500;color:var(--text-color);margin:0;font-size:.875rem}.btn-add-files{background:none;border:none;color:var(--accent-color);font-weight:500;cursor:pointer;font-size:.875rem;padding:.25rem}.btn-add-files:hover{text-decoration:underline}.file-list{list-style:none;margin:0;padding:0;font-size:.875rem}.file-list li{display:flex;justify-content:space-between;align-items:center;padding:.35rem .5rem;background-color:#f1f3f5;border-radius:4px;margin-bottom:.25rem;color:var(--text-color)}.file-list-item-name{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex-grow:1;margin-right:.5rem}.btn-remove-file-inline{background:none;border:none;color:var(--error-text-color);cursor:pointer;font-size:1.2rem;line-height:1;padding:0 .5rem;flex-shrink:0;pointer-events:all}.btn-remove-file-inline:hover{color:#a00}.checkbox-group{display:flex;align-items:center}.checkbox-group input[type=checkbox]{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-color:#fff;margin:0;color:currentColor;width:1.15em;height:1.15em;border:1px solid var(--border-color);border-radius:.25em;display:grid;place-content:center;cursor:pointer}.checkbox-group input[type=checkbox]:before{content:"";width:.65em;height:.65em;transform:scale(0);transition:.12s transform ease-in-out;box-shadow:inset 1em 1em var(--accent-color);clip-path:polygon(14% 44%,0 65%,50% 100%,100% 16%,80% 0%,43% 62%)}.checkbox-group input[type=checkbox]:checked:before{transform:scale(1)}.checkbox-group input[type=checkbox]:focus{outline:none;box-shadow:0 0 0 2px #1877f233}.checkbox-group label{margin-left:.5rem;color:var(--text-color);cursor:pointer}.secondary-button{background-color:var(--button-secondary-bg);color:var(--button-secondary-text)}.secondary-button:hover:not(:disabled){background-color:var(--button-secondary-hover);color:var(--button-secondary-text)}.secondary-button:disabled{background-color:var(--button-secondary-bg);opacity:.5}.get-data-button{background-color:var(--button-green-bg);color:#fff;padding:.75rem 1.5rem;border-radius:6px;border:none;cursor:pointer;font-weight:500;transition:background-color .2s}.get-data-button:hover:not(:disabled){background-color:var(--button-green-hover)}.get-data-button:disabled{background-color:var(--button-secondary-bg);color:var(--button-secondary-text);opacity:.5;cursor:not-allowed}.metadata-section-container{padding-top:1.5rem;width:100%}.metadata-section-container .form-section{border:none;box-shadow:none;padding:0;background:none}.metadata-grid{display:grid;grid-template-columns:1fr;gap:1.5rem}.card{background-color:var(--card-bg-color);border:1px solid var(--border-color);border-radius:8px;box-shadow:0 1px 2px #0000001a;display:flex;flex-direction:column}.card-header{display:flex;align-items:center;padding:1rem 1.5rem;border-bottom:1px solid var(--border-color);min-height:65px}.card-title-input{width:100%;font-size:1.125rem;font-weight:700;color:var(--text-color);border:1px solid transparent;border-radius:4px;padding:.25rem .5rem;background-color:transparent;transition:all .2s}.card-title-input:hover{background-color:var(--input-bg-color)}.card-title-input:focus{outline:none;background-color:var(--card-bg-color);border-color:var(--accent-color);box-shadow:0 0 0 2px #1877f233}.card-body{padding:1.5rem;flex-grow:1}.card-footer{padding:1rem 1.5rem;border-top:1px solid var(--border-color);background-color:#f7f8fa;border-bottom-left-radius:8px;border-bottom-right-radius:8px}.book-card-layout{display:flex;flex-direction:column;gap:1.5rem}.book-cover-column{width:100%;display:flex;flex-direction:column;align-items:center;gap:.75rem}.book-details-column{width:100%;display:flex;flex-direction:column;gap:1rem}.details-row{display:flex;flex-direction:column;gap:1rem;width:100%}@media(min-width:640px){.book-card-layout{flex-direction:row;align-items:flex-start}.book-cover-column{width:140px;flex-shrink:0}.book-details-column{flex-grow:1}.details-row{flex-direction:row}}.clickable-cover{cursor:pointer;transition:opacity .2s;position:relative}.clickable-cover:hover{opacity:.8}.cover-preview{width:100%;aspect-ratio:2 / 3;background-color:var(--input-bg-color);border-radius:4px;display:flex;align-items:center;justify-content:center;color:#adb5bd;font-weight:500;border:1px solid var(--border-color);overflow:hidden}.cover-preview img{width:100%;height:100%;object-fit:cover}.metadata-field{display:flex;flex-direction:column;width:100%}.metadata-field label{font-size:.8rem;font-weight:500;color:var(--text-secondary-color);margin-bottom:.25rem}.metadata-field input{background-color:#fff}.flex-grow-1{flex:1}.flex-grow-2{flex:2}.flex-grow-05{flex:.5}.css-settings-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1.5rem;margin-top:1rem}.setting-group-title{margin:0 0 1rem;font-size:.9rem;font-weight:600;color:var(--text-color)}.css-setting-group .metadata-field{margin-bottom:1rem}.css-setting-group .metadata-field:last-child{margin-bottom:0}@media(min-width:900px){#epub-form{grid-template-columns:1fr;align-items:start}}.settings-grid{display:grid;grid-template-columns:1fr;gap:1.5rem}@media(min-width:768px){.settings-grid{grid-template-columns:1fr 1fr;align-items:start;gap:2rem}}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:center;justify-content:center;opacity:0;visibility:hidden;transition:opacity .3s ease,visibility 0s .3s;z-index:1000}.modal-overlay.is-visible{opacity:1;visibility:visible;transition:opacity .3s ease}.modal-content{background:#fff;padding:2rem;border-radius:8px;max-width:600px;width:90%;max-height:80vh;overflow-y:auto;position:relative;box-shadow:0 5px 15px #0003;transform:translateY(20px);transition:transform .3s ease}.modal-overlay.is-visible .modal-content{transform:translateY(0)}.modal-close-button{position:absolute;top:1rem;right:1rem;background:transparent;border:none;cursor:pointer;color:var(--text-secondary-color);padding:0}.modal-close-button svg{width:24px;height:24px}.modal-content h2{margin-top:0;font-size:1.5rem}.modal-content h4{margin-top:1.5rem;margin-bottom:.5rem;font-size:1.1rem;font-weight:700}.modal-content p,.modal-content ul{color:var(--text-secondary-color);line-height:1.6}.modal-content ul{padding-left:1.5rem}.modal-content li{margin-bottom:.5rem}.modal-content strong{color:var(--text-color);font-weight:500}.sticky-footer{position:fixed;bottom:0;left:0;width:100%;background-color:var(--card-bg-color);border-top:1px solid var(--border-color);padding:1rem;box-shadow:0 -2px 10px #00000014;z-index:100}.sticky-footer .content-wrapper{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:1rem;padding:0}.sticky-footer .content-wrapper>#how-to-use-btn{justify-self:start}.sticky-footer .content-wrapper>#generate-btn{justify-self:center;width:auto;min-width:220px}.sticky-footer .content-wrapper>#settings-btn{justify-self:end}