.sk-hub,.sk-tool-page{max-width:1180px;margin:auto;padding:42px 20px;color:#12233f}.sk-hub-head{display:flex;justify-content:space-between;gap:25px;align-items:end;margin-bottom:25px}.sk-kicker{color:#176ff2;font-weight:700;font-size:.78rem;text-transform:uppercase;letter-spacing:.08em}.sk-hub h1,.sk-tool-header h1{font-size:clamp(2rem,4vw,3.1rem);line-height:1.06;letter-spacing:-.035em;margin:.35rem 0 .7rem}.sk-hub p,.sk-tool-header p{color:#64748b;line-height:1.7}.sk-search input{width:330px;border:1px solid #dfe7f2;border-radius:999px;padding:14px 18px;font:inherit}.sk-category-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:14px;margin:24px 0 34px}.sk-cat,.sk-tool-card{border:1px solid #e5ecf5;background:#fff;border-radius:18px;box-shadow:0 8px 28px rgba(20,50,90,.05);text-decoration:none;color:inherit}.sk-cat{display:flex;flex-direction:column;gap:8px;padding:18px;min-height:145px}.sk-cat:hover,.sk-tool-card:hover{transform:translateY(-2px);box-shadow:0 14px 34px rgba(20,50,90,.09)}.sk-cat-icon{font-size:24px}.sk-cat small{color:#718096;line-height:1.45}.sk-tool-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.sk-tool-card{display:flex;flex-direction:column;gap:9px;padding:21px}.sk-tool-card strong{font-size:1.1rem}.sk-tool-card>span:not(.sk-tool-cat){color:#687891;line-height:1.5}.sk-tool-card b{color:#176ff2;margin-top:auto}.sk-tool-cat{font-size:.72rem;color:#176ff2;font-weight:700;text-transform:uppercase;letter-spacing:.06em}.sk-breadcrumb{display:flex;gap:9px;color:#718096;font-size:.9rem;margin-bottom:25px}.sk-breadcrumb a{color:#176ff2;text-decoration:none}.sk-tool-header{padding:15px 0}.sk-app{margin:18px 0 34px;padding:26px;border:1px solid #e0e9f3;border-radius:24px;background:linear-gradient(135deg,#f5f9ff,#fff);box-shadow:0 12px 40px rgba(24,64,110,.07)}.sk-form{display:grid;gap:14px;max-width:760px}.sk-form label{display:grid;gap:7px;font-weight:600}.sk-form input,.sk-form textarea,.sk-form select{font:inherit;border:1px solid #d7e1ee;border-radius:12px;padding:12px;background:#fff;color:#172840}.sk-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}.sk-subjects{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.sk-btn,.sk-btn-link{width:max-content;border:0;border-radius:999px;padding:12px 19px;background:#176ff2;color:#fff;font-weight:700;cursor:pointer;text-decoration:none}.sk-result{display:none;padding:16px 18px;border-radius:14px;background:#fff;border:1px solid #dfe8f3}.sk-result.is-visible{display:block}.sk-result strong{display:block;font-size:1.35rem;color:#12325a}.sk-result small{display:block;color:#70809a;margin-top:5px}.sk-help{color:#64748b;line-height:1.6}.sk-table{display:grid;gap:8px}.sk-table>div{display:grid;grid-template-columns:150px 1fr 1fr;gap:10px;padding:11px;border:1px solid #e3eaf3;border-radius:10px;background:#fff}.sk-tool-copy{max-width:800px;color:#40516a;line-height:1.8}.sk-tool-copy h2{color:#132945;margin-top:2em}.sk-info-box{padding:18px;border:1px solid #dfe8f3;border-radius:14px;background:#fff;line-height:1.7}.sk-cards{display:grid;gap:10px}.sk-flash{border:1px solid #dfe8f3;background:#fff;border-radius:14px;padding:16px;text-align:left;cursor:pointer}.sk-flash span{display:none;margin-top:8px;color:#176ff2}.sk-flash.show-back span{display:block}.screen-reader-text{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
@media(max-width:980px){.sk-category-grid{grid-template-columns:repeat(3,1fr)}.sk-tool-grid{grid-template-columns:repeat(2,1fr)}.sk-hub-head{display:block}.sk-search input{width:100%;margin-top:16px}}@media(max-width:620px){.sk-category-grid,.sk-tool-grid{grid-template-columns:1fr}.sk-row,.sk-subjects{grid-template-columns:1fr}.sk-hub,.sk-tool-page{padding:28px 15px}.sk-app{padding:18px}.sk-table>div{grid-template-columns:1fr}}
.sk-checklist{display:grid;gap:10px}.sk-checklist label{display:flex;gap:10px;align-items:center;padding:11px 12px;background:#fff;border:1px solid #e3eaf3;border-radius:10px;font-weight:500}.sk-checklist input{accent-color:#176ff2}

/* v1.3 premium navigation helpers */
.sk-tool-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.sk-tool-actions button{border:1px solid #d9e2ef;background:#fff;border-radius:10px;padding:9px 13px;font:inherit;cursor:pointer;color:#24364b}
.sk-tool-actions button:hover{border-color:#9fb4cc;background:#f7fafc}
.sk-save-tool[aria-pressed="true"]{background:#eef5ff;border-color:#b8d1f4}
.sk-related{margin-top:42px;padding-top:30px;border-top:1px solid #e5ebf2}
.sk-related-head{display:flex;justify-content:space-between;gap:20px;align-items:end;margin-bottom:18px}
.sk-related-head h2{margin:4px 0 6px}.sk-related-head p{margin:0;color:#64748b}.sk-related-head>a{white-space:nowrap;font-weight:700;text-decoration:none}
.sk-related-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
.sk-related-card{display:flex;flex-direction:column;gap:8px;padding:18px;border:1px solid #e1e8f0;border-radius:16px;background:#fff;text-decoration:none;color:inherit;transition:.18s ease}
.sk-related-card:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(30,60,90,.08);border-color:#bfd0e2}
.sk-related-card span,.sk-related-card small{color:#64748b;font-size:.86rem}.sk-related-card strong{font-size:1rem}.sk-related-card b{margin-top:auto;font-size:.9rem}
.sk-tools-archive{max-width:1180px;margin:0 auto;padding:45px 20px}.sk-archive-hero{padding:32px 0 28px}.sk-archive-hero h1{margin:.25rem 0 .5rem}.sk-archive-hero p{max-width:760px;color:#64748b;line-height:1.7}.sk-archive-search{display:block;max-width:620px;margin-top:20px}.sk-archive-search input{width:100%;box-sizing:border-box;padding:14px 16px;border:1px solid #d9e2ef;border-radius:12px;font-size:1rem}
@media(max-width:900px){.sk-related-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:600px){.sk-related-head{display:block}.sk-related-head>a{display:inline-block;margin-top:12px}.sk-related-grid{grid-template-columns:1fr}.sk-tools-archive{padding:30px 16px}}
/* v1.4 premium utility navigation */
.sk-recent-wrap{margin:10px 0 34px;padding:22px;border:1px solid #e3eaf3;border-radius:22px;background:#f8fbff}.sk-section-head{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:14px}.sk-section-head h2{margin:.25rem 0 0}.sk-section-head a{font-weight:700;text-decoration:none;color:#176ff2}.sk-mini-grid{grid-template-columns:repeat(4,1fr)}.sk-saved-page{max-width:1180px;margin:auto;padding:44px 20px}.sk-saved-page>p{color:#64748b;line-height:1.7;max-width:760px}.sk-saved-page .sk-tool-grid{margin-top:24px}@media(max-width:900px){.sk-mini-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:600px){.sk-section-head{display:block}.sk-mini-grid{grid-template-columns:1fr}.sk-saved-page{padding:30px 16px}}


/* StudyKit Premium JPG-to-PDF engine */
.sk-pdf-maker .sk-pdf-drop{border:2px dashed rgba(30,64,175,.25);border-radius:16px;padding:22px;text-align:center;background:#f8fbff;cursor:pointer;display:flex;flex-direction:column;gap:5px;align-items:center}
.sk-pdf-maker .sk-pdf-drop input{margin-top:8px;max-width:100%}
.sk-pdf-maker .sk-pdf-drop.is-dragging{border-color:#2563eb;background:#eef5ff}
.sk-pdf-options{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:16px 0}
.sk-pdf-options label,.sk-pdf-actions label{display:flex;flex-direction:column;gap:6px;font-weight:600}
.sk-pdf-files{display:grid;gap:8px;margin:12px 0}
.sk-pdf-file{display:grid;grid-template-columns:52px 1fr auto;align-items:center;gap:12px;padding:9px 10px;border:1px solid #e5e7eb;border-radius:12px;background:#fff}
.sk-pdf-file[draggable="true"]{cursor:grab}
.sk-pdf-thumb{width:52px;height:52px;border-radius:8px;overflow:hidden;background:#f3f4f6}
.sk-pdf-thumb img{width:100%;height:100%;object-fit:cover;display:block}
.sk-pdf-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.sk-pdf-remove{border:0;background:transparent;text-decoration:underline;cursor:pointer;padding:6px}
.sk-pdf-actions{display:grid;grid-template-columns:1fr auto;gap:12px;align-items:end}
.sk-pdf-actions input,.sk-pdf-options select{width:100%;box-sizing:border-box}
@media(max-width:700px){
  .sk-pdf-options{grid-template-columns:1fr 1fr}
  .sk-pdf-actions{grid-template-columns:1fr}
  .sk-pdf-file{grid-template-columns:44px 1fr}
  .sk-pdf-remove{grid-column:2;justify-self:start}
}
@media(max-width:480px){
  .sk-pdf-options{grid-template-columns:1fr}
  .sk-pdf-maker .sk-pdf-drop{padding:18px 12px}
}


/* StudyKit v1.9 — Plagiarism Checker */
.sk-plagiarism-note{display:flex;flex-direction:column;gap:4px;padding:14px 16px;border:1px solid #dbeafe;background:#f8fbff;border-radius:14px;margin-bottom:16px}
.sk-plagiarism-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.sk-plagiarism-grid label{display:flex;flex-direction:column;gap:7px;font-weight:600}
.sk-plagiarism-grid textarea{width:100%;min-height:190px;box-sizing:border-box;resize:vertical}
.sk-sim-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:14px 0}
.sk-sim-grid span{padding:14px;border:1px solid #e5e7eb;border-radius:12px;background:#fff;text-align:center}
.sk-sim-grid b{display:block;font-size:1.35rem}
.sk-sim-grid small{display:block;margin-top:4px}
.sk-external-check{margin-top:18px;padding:16px;border-radius:14px;background:#f8fafc;border:1px solid #e5e7eb}
.sk-external-check p{margin:6px 0 12px}
@media(max-width:700px){
  .sk-plagiarism-grid,.sk-sim-grid{grid-template-columns:1fr}
}


/* StudyKit v2.0 — premium similarity checker */
.sk-plagiarism-grid label{min-width:0}.sk-field-meta{color:#718096;font-weight:500}.sk-plagiarism-actions{display:flex;gap:10px;flex-wrap:wrap}.sk-secondary-btn{border:1px solid #d7e1ee;background:#fff;color:#233650;border-radius:999px;padding:12px 18px;font-weight:700;cursor:pointer}.sk-secondary-btn:hover{background:#f6f9fc;border-color:#b8c9dc}.sk-secondary-btn:disabled{opacity:.5;cursor:not-allowed}.sk-match-preview{margin-top:16px;padding:16px;border:1px solid #dfe8f3;border-radius:14px;background:#fff}.sk-match-list{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}.sk-match-list span{display:inline-block;padding:7px 10px;border-radius:999px;background:#f2f6fb;border:1px solid #dce6f1;color:#29405e;font-size:.9rem}.sk-match-preview small{color:#718096;line-height:1.6}.sk-plagiarism .sk-result p{margin:8px 0}.sk-plagiarism .sk-result p strong{font-size:1rem;color:#233650}@media(max-width:700px){.sk-plagiarism-actions{display:grid;grid-template-columns:1fr}.sk-plagiarism-actions button{width:100%}}