.pdf-page { background: radial-gradient(circle at 20% 0, rgba(249,115,22,.08), transparent 30%), var(--bg); }
.pdf-shell { width: min(1080px, calc(100% - 32px)); margin: 0 auto; padding: 108px 0 70px; }
.tool-heading { max-width: 760px; margin-bottom: 30px; }
.tool-heading h1 { font-size: clamp(2rem,5vw,3.25rem); letter-spacing: -.04em; margin: 10px 0 12px; }
.tool-heading p { color: var(--text-2); font-size: 1rem; line-height: 1.8; }
.back-link { display: inline-block; color: var(--text-2); font-size: .86rem; margin-bottom: 22px; }
.back-link:hover { color: var(--cyan); }
.control-card,.queue-card { background: rgba(13,18,32,.82); border: 1px solid var(--border); border-radius: 20px; padding: 24px; box-shadow: var(--shadow); }
.upload-zone { min-height: 220px; border: 1.5px dashed rgba(249,115,22,.42); border-radius: 15px; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; cursor: pointer; transition: .2s; background: rgba(249,115,22,.025); }
.upload-zone:hover,.upload-zone.dragover { border-color: var(--orange); background: rgba(249,115,22,.07); transform: translateY(-1px); }
.upload-icon { width: 58px; height: 66px; display: grid; place-items: center; color: var(--orange); border: 2px solid var(--orange); border-radius: 8px 8px 14px 8px; font-weight: 800; font-size: .8rem; margin-bottom: 18px; box-shadow: 0 0 24px rgba(249,115,22,.15); }
.upload-zone h2 { font-size: 1.05rem; margin-bottom: 6px; }
.upload-zone p { color: var(--text-3); font-size: .82rem; }
.settings-row { display: grid; grid-template-columns: 2fr 1fr; gap: 22px; padding-top: 24px; }
.setting-label { display: block; font-size: .8rem; color: var(--text-2); margin-bottom: 9px; }
.quality-options { display: grid; grid-template-columns: repeat(3,1fr); gap: 8px; }
.quality-options button { font-family: var(--font); padding: 11px 10px; border-radius: 9px; border: 1px solid var(--border); background: var(--surface); color: var(--text-2); cursor: pointer; text-align: left; }
.quality-options button.active { color: var(--cyan); border-color: var(--cyan); background: var(--cyan-dim); }
.quality-options b,.quality-options small { display: block; }
.quality-options small { margin-top: 2px; color: var(--text-3); font-size: .68rem; }
.setting-note { align-self: end; padding: 11px 14px; border-radius: 9px; background: var(--surface); border: 1px solid var(--border); }
.setting-note b,.setting-note span { display: block; font-size: .76rem; }
.setting-note span { color: var(--text-3); margin-top: 3px; }
.queue-card { margin-top: 20px; }
.queue-header,.action-bar { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.queue-header h2 { font-size: 1rem; }
.queue-header span { color: var(--text-3); font-size: .76rem; }
.text-button { border: 0; background: none; font: inherit; font-size: .76rem; cursor: pointer; color: var(--text-2); }
.text-button.danger:hover { color: var(--red); }
.file-list { display: grid; gap: 9px; margin: 18px 0; }
.file-row { display: grid; grid-template-columns: 38px 1fr auto auto; align-items: center; gap: 12px; padding: 12px; background: var(--surface); border: 1px solid var(--border); border-radius: 10px; }
.file-type { width: 38px; height: 38px; display: grid; place-items: center; background: var(--orange-dim); color: var(--orange); border-radius: 8px; font-size: .65rem; font-weight: 700; }
.file-name { min-width: 0; }
.file-name b { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: .84rem; }
.file-name small,.file-status { color: var(--text-3); font-size: .7rem; }
.file-status.done { color: var(--green); }.file-status.error { color: var(--red); }.file-status.working { color: var(--cyan); }
.row-button { border: 1px solid var(--border); background: var(--surface); color: var(--text-2); border-radius: 6px; padding: 6px 9px; cursor: pointer; font-size: .72rem; }
.row-button:hover { border-color: var(--cyan); color: var(--cyan); }
.progress-area { display: flex; align-items: center; gap: 12px; margin: 14px 0; }
.progress-track { height: 5px; flex: 1; background: rgba(255,255,255,.06); border-radius: 5px; overflow: hidden; }
#progress-fill { height: 100%; width: 0; background: linear-gradient(90deg,var(--orange),var(--cyan)); transition: width .2s; }
#progress-text { color: var(--text-3); font-size: .72rem; white-space: nowrap; }
.action-bar { justify-content: flex-end; padding-top: 17px; border-top: 1px solid var(--border); flex-wrap: wrap; }
.primary-button,.secondary-button { border-radius: 9px; padding: 10px 18px; font-family: var(--font); font-weight: 600; cursor: pointer; }
.primary-button { border: 0; color: #111827; background: linear-gradient(135deg,var(--orange),#fbbf24); }
.secondary-button { border: 1px solid var(--border-2); color: var(--text-2); background: var(--surface-2); }
.primary-button:disabled,.secondary-button:disabled { opacity: .45; cursor: not-allowed; }
.explain-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 15px; margin-top: 20px; }
.explain-grid article { padding: 20px; border: 1px solid var(--border); border-radius: 14px; background: var(--surface); }
.explain-grid article>span { color: var(--orange); font: 700 .72rem var(--font-mono); }
.explain-grid h3 { font-size: .9rem; margin: 8px 0 5px; }.explain-grid p { color: var(--text-3); font-size: .76rem; }
.hidden { display: none !important; }
@media(max-width:720px){.settings-row,.explain-grid{grid-template-columns:1fr}.quality-options{grid-template-columns:1fr}.file-row{grid-template-columns:38px 1fr auto}.file-status{grid-column:2}.action-bar>*{flex:1}.nav-links{display:flex}}