:root{color-scheme:light;--bg: #f5f6f8;--panel: #ffffff;--border: #e2e5ea;--text: #1a1d23;--muted: #6b7280;--accent: #1d4ed8;--accent-contrast: #ffffff;--danger: #dc2626;font-family:Segoe UI,system-ui,-apple-system,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}button{font-family:inherit;cursor:pointer}button.secondary{display:inline-flex;align-items:center;gap:6px;background:var(--panel);border:1px solid var(--border);padding:8px 14px;border-radius:8px;font-weight:600;font-size:.85rem;color:var(--text)}.app-shell{display:flex;min-height:100vh}.app-sidebar{width:240px;flex-shrink:0;background:var(--panel);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:16px 12px}.app-brand{font-weight:700;font-size:1.1rem;padding:8px 12px 20px}.app-sidebar nav{display:flex;flex-direction:column;gap:2px;flex:1}.nav-link{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:8px;color:var(--text);text-decoration:none;font-size:.92rem}.nav-link:hover{background:var(--bg)}.nav-link.active{background:var(--accent);color:var(--accent-contrast)}.app-user{display:flex;align-items:center;justify-content:space-between;padding:12px;border-top:1px solid var(--border);margin-top:12px}.app-user-name{font-size:.85rem;font-weight:600}.app-user-role{font-size:.75rem;color:var(--muted);text-transform:capitalize}.icon-button{background:none;border:none;padding:6px;border-radius:6px;color:var(--muted)}.icon-button:hover{background:var(--bg)}.app-content{flex:1;padding:32px}.page h1{margin-top:0}.muted{color:var(--muted)}.stat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:16px;margin-top:24px}.stat-card{background:var(--panel);border:1px solid var(--border);border-radius:10px;padding:18px}.stat-value{font-size:1.6rem;font-weight:700}.stat-label{color:var(--muted);font-size:.85rem;margin-top:4px}.stat-card-link{text-decoration:none;color:inherit;display:block;transition:border-color .15s}.stat-card-link:hover{border-color:var(--accent)}.stat-value.warn{color:#f59e0b}.dashboard-columns{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:32px}.section-title{font-size:1rem;margin:0 0 12px}.activity-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:2px}.activity-list li{display:flex;justify-content:space-between;gap:12px;padding:10px 12px;background:var(--panel);border:1px solid var(--border);border-radius:8px;font-size:.85rem}.activity-list li:not(:last-child){margin-bottom:6px}.activity-list span:first-child{font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.activity-list span.muted{flex-shrink:0;font-size:.78rem}@media (max-width: 720px){.dashboard-columns{grid-template-columns:1fr}}.search-results{display:flex;flex-direction:column;gap:8px}.search-result-row{background:var(--panel);border:1px solid var(--border);border-radius:10px;padding:12px 14px;display:flex;align-items:center;justify-content:space-between;gap:12px}.search-result-title{font-weight:600;font-size:.92rem}.toolbar input{border:1px solid var(--border);border-radius:8px;padding:8px 10px;font-size:.85rem;background:var(--panel);color:var(--text)}.bulk-row-list{display:flex;flex-direction:column;gap:6px}.bulk-row{display:grid;grid-template-columns:1.5fr 1fr 1.2fr auto auto;align-items:center;gap:10px;background:var(--panel);border:1px solid var(--border);border-radius:8px;padding:8px 10px}.bulk-row input{border:1px solid var(--border);border-radius:6px;padding:6px 8px;font-size:.82rem}.bulk-row-filename{font-size:.78rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.bulk-row-status{font-size:.78rem;white-space:nowrap}.bulk-row-actions{display:flex;gap:2px}@media (max-width: 760px){.bulk-row{grid-template-columns:1fr 1fr}.bulk-row-filename{grid-column:1 / -1}}.import-tabs{display:flex;gap:4px;border-bottom:1px solid var(--border);padding:0 32px;margin:-32px -32px 24px;background:var(--panel)}.import-tabs button{background:none;border:none;padding:14px 16px;font-weight:600;font-size:.88rem;color:var(--muted);border-bottom:2px solid transparent}.import-tabs button.active{color:var(--accent);border-bottom-color:var(--accent)}.import-steps{display:flex;gap:8px;margin:16px 0 20px;flex-wrap:wrap}.import-step{font-size:.78rem;padding:6px 12px;border-radius:999px;background:var(--bg);color:var(--muted);border:1px solid var(--border)}.import-step.active{background:var(--accent);color:var(--accent-contrast);border-color:var(--accent)}.import-step.done{color:#16a34a;border-color:#16a34a}.import-summary-bar{display:flex;gap:10px;margin-bottom:16px;flex-wrap:wrap}.badge-inline{font-size:.78rem;padding:5px 12px;border-radius:999px;font-weight:600}.badge-success{background:#16a34a1f;color:#16a34a}.badge-warning-inline{background:#f59e0b26;color:#b45309}.badge-danger-inline{background:#dc26261f;color:var(--danger)}.import-summary-card{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:32px;text-align:center;max-width:480px;display:flex;flex-direction:column;align-items:center;gap:8px}.import-summary-card button{margin-top:12px;background:var(--accent);color:var(--accent-contrast);border:none;padding:9px 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button.link-button{background:none;border:none;color:var(--accent);font-size:.85rem;padding:4px}.field-error{color:var(--danger);font-weight:400;font-size:.78rem}.form-error{color:var(--danger);font-size:.85rem}.form-success{color:#16a34a;font-size:.85rem}.page-loading{display:flex;align-items:center;justify-content:center;min-height:100vh;color:var(--muted)}.page-header{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.page-header button{display:inline-flex;align-items:center;gap:6px;background:var(--accent);color:var(--accent-contrast);border:none;padding:9px 14px;border-radius:8px;font-weight:600;font-size:.88rem}.toolbar{display:flex;gap:12px;margin:20px 0;flex-wrap:wrap}.search-box{display:flex;align-items:center;gap:8px;background:var(--panel);border:1px solid var(--border);border-radius:8px;padding:8px 12px;flex:1;min-width:220px;color:var(--muted)}.search-box input{border:none;outline:none;flex:1;font-size:.9rem;color:var(--text);background:transparent}.toolbar select{border:1px solid var(--border);border-radius:8px;padding:8px 10px;background:var(--panel);font-size:.88rem}.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}.book-card{background:var(--panel);border:1px solid var(--border);border-radius:10px;overflow:hidden;display:flex;flex-direction:column}.book-cover{position:relative;aspect-ratio:3 / 4;background:var(--bg);display:flex;align-items:center;justify-content:center}.book-cover img{width:100%;height:100%;object-fit:cover}.book-cover-placeholder{font-size:2.4rem;font-weight:700;color:var(--border)}.badge{position:absolute;top:8px;right:8px;font-size:.7rem;padding:3px 8px;border-radius:999px;font-weight:600}.badge-muted{background:#0000008c;color:#fff}.badge-warning{background:#f59e0b;color:#1a1d23}.badge-danger{background:var(--danger);color:#fff}.book-body{padding:12px;flex:1}.book-title{font-weight:600;font-size:.92rem;line-height:1.3}.book-meta{font-size:.8rem;margin-top:4px}.book-actions{display:flex;gap:2px;padding:8px 10px;border-top:1px solid var(--border)}.icon-button.danger{color:var(--danger)}.icon-button:disabled{opacity:.35;cursor:not-allowed}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000073;display:flex;align-items:center;justify-content:center;padding:16px;z-index:100}.modal-card{background:var(--panel);border-radius:12px;width:100%;max-width:640px;max-height:90vh;display:flex;flex-direction:column;overflow:hidden}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--border)}.modal-header h2{margin:0;font-size:1.1rem}.modal-body{padding:20px;overflow-y:auto;display:flex;flex-direction:column;gap:16px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.form-grid label{display:flex;flex-direction:column;gap:6px;font-size:.82rem;font-weight:600}.form-grid label.span-2{grid-column:1 / -1}.form-grid input,.form-grid textarea{padding:9px 10px;border:1px solid var(--border);border-radius:8px;font-size:.9rem;font-family:inherit;font-weight:400}.dropzone-field{display:flex;flex-direction:column;gap:6px}.dropzone-label{font-size:.82rem;font-weight:600}.dropzone{border:2px dashed var(--border);border-radius:10px;padding:18px;text-align:center;cursor:pointer}.dropzone.active{border-color:var(--accent);background:#1d4ed80d}.dropzone-placeholder,.dropzone-file{display:flex;flex-direction:column;align-items:center;gap:6px;color:var(--muted);font-size:.82rem}.dropzone-hint{font-size:.75rem;color:var(--muted)}.modal-actions{display:flex;justify-content:flex-end;gap:10px;padding-top:8px;border-top:1px solid var(--border)}.modal-actions button[type=submit]{background:var(--accent);color:var(--accent-contrast);border:none;padding:9px 16px;border-radius:8px;font-weight:600}.modal-actions button.secondary{background:var(--panel);border:1px solid var(--border);padding:9px 16px;border-radius:8px;font-weight:600}@media (max-width: 560px){.form-grid{grid-template-columns:1fr}.form-grid label.span-2{grid-column:auto}}.badge.static{position:static;display:inline-block}.course-list{display:flex;flex-direction:column;gap:10px}.course-row{background:var(--panel);border:1px solid var(--border);border-radius:10px;padding:14px 16px;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.course-title-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.course-name{font-weight:600}.course-code{font-size:.78rem;color:var(--muted);background:var(--bg);border-radius:6px;padding:2px 8px}.course-actions{display:flex;gap:2px}.link-section{border-top:1px solid var(--border);padding-top:12px}.link-section:first-child{border-top:none;padding-top:0}.link-section h3{margin:0 0 8px;font-size:.88rem}.link-section select{width:100%;padding:9px 10px;border:1px solid var(--border);border-radius:8px}.checkbox-list{display:flex;flex-direction:column;gap:6px;max-height:160px;overflow-y:auto}.checkbox-row{display:flex;align-items:center;gap:8px;font-size:.85rem;font-weight:400}.pricing-layout{display:grid;grid-template-columns:2fr 1fr;gap:20px;align-items:start;margin-top:16px}.pricing-form{background:var(--panel);border:1px solid var(--border);border-radius:10px;padding:18px;display:flex;flex-direction:column;gap:14px}.pricing-form label{display:flex;flex-direction:column;gap:6px;font-size:.82rem;font-weight:600}.pricing-form input{padding:9px 10px;border:1px solid var(--border);border-radius:8px;font-size:.9rem;font-weight:400}.pricing-summary{display:flex;flex-direction:column;gap:12px}.history-table-wrap{margin-top:24px;overflow-x:auto}.history-table{width:100%;border-collapse:collapse;background:var(--panel);border:1px solid var(--border);border-radius:10px;overflow:hidden;font-size:.85rem}.history-table th,.history-table td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--border)}.history-table th{background:var(--bg);font-weight:600;font-size:.78rem;text-transform:uppercase;color:var(--muted)}@media (max-width: 720px){.pricing-layout{grid-template-columns:1fr}}