/* Chapter 1 ICT theme: purple is dominant, supported by distinct topic accents. */
.ict-chapter-page{
  --ch-purple:#6d28d9;
  --ch-purple-dark:#4c1d95;
  --ch-purple-mid:#7c3aed;
  --ch-purple-light:#ede9fe;
  --ch-blue:#2563eb;
  --ch-teal:#0f766e;
  --ch-orange:#d97706;
  --ch-rose:#e11d48;
  --ch-cyan:#0891b2;
  background:linear-gradient(180deg,#fbfaff 0%,#ffffff 13%,#fbfaff 100%);
}

/* Keep purple visually dominant in the chapter shell. */
.ict-chapter-page .hero{
  background:
    radial-gradient(circle at 90% 15%,rgba(255,255,255,.15) 0 8%,transparent 9%),
    linear-gradient(135deg,#3f176f 0%,#5b21b6 35%,#7c3aed 72%,#9f67ff 100%);
  border:1px solid rgba(221,214,254,.82);
}
.ict-chapter-page .hero .eyebrow{background:rgba(255,255,255,.18);}
.ict-chapter-page .hero h2{max-width:900px;text-shadow:0 2px 10px rgba(31,15,61,.18);}
.ict-chapter-page .ict-pill-strip span:nth-child(1){border-color:#bfdbfe;background:rgba(37,99,235,.20);}
.ict-chapter-page .ict-pill-strip span:nth-child(2){border-color:#99f6e4;background:rgba(15,118,110,.20);}
.ict-chapter-page .ict-pill-strip span:nth-child(3){border-color:#fed7aa;background:rgba(217,119,6,.20);}
.ict-chapter-page .ict-pill-strip span:nth-child(4){border-color:#fecdd3;background:rgba(225,29,72,.18);}
.ict-chapter-page .ict-pill-strip span:nth-child(5){border-color:#a5f3fc;background:rgba(8,145,178,.20);}

.ict-chapter-page .ict-jump-panel{
  background:linear-gradient(135deg,#faf7ff 0%,#f4efff 60%,#fff 100%);
  border:1px solid #d8c9fb;
  box-shadow:0 14px 34px rgba(91,33,182,.11);
}
.ict-chapter-page .ict-jump-panel h2{color:var(--ch-purple-dark);}
.ict-chapter-page .ict-jump-grid a{transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease;}
.ict-chapter-page .ict-jump-grid a:nth-child(1){border-left-color:var(--ch-blue);}
.ict-chapter-page .ict-jump-grid a:nth-child(2){border-left-color:var(--ch-teal);}
.ict-chapter-page .ict-jump-grid a:nth-child(3){border-left-color:var(--ch-orange);}
.ict-chapter-page .ict-jump-grid a:nth-child(4){border-left-color:var(--ch-rose);}
.ict-chapter-page .ict-jump-grid a:nth-child(5){border-left-color:var(--ch-cyan);}

/* Every major section still uses purple headings, with a secondary accent strip. */
.ict-chapter-page .ict-topic-section{
  position:relative;
  overflow:hidden;
  border-color:#e1d7fb;
  box-shadow:0 12px 30px rgba(76,29,149,.075);
}
.ict-chapter-page .ict-topic-section::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:6px;
  background:var(--section-accent,var(--ch-purple));
}
.ict-chapter-page #topic-1-1{--section-accent:var(--ch-blue);}
.ict-chapter-page #topic-1-2{--section-accent:var(--ch-teal);}
.ict-chapter-page #topic-1-3{--section-accent:var(--ch-orange);}
.ict-chapter-page #topic-1-4{--section-accent:var(--ch-rose);}
.ict-chapter-page #topic-1-5{--section-accent:var(--ch-cyan);}
.ict-chapter-page .ict-topic-section>h2{
  color:var(--ch-purple-dark);
  background:linear-gradient(90deg,#f6f0ff 0%,rgba(255,255,255,0) 78%);
  border-bottom-color:#e8ddff;
  border-radius:12px 12px 0 0;
  padding:10px 12px 12px;
}
.ict-chapter-page .ict-topic-section>.topic-intro{
  border-left:4px solid var(--section-accent,var(--ch-purple));
  background:#fcfbff;
  padding:12px 14px;
  border-radius:0 12px 12px 0;
}

/* Supporting colours make dense notes easier to scan without taking over from purple. */
.ict-chapter-page .ict-card,
.ict-chapter-page .ict-compare-card{
  border-color:#e8e2f4;
  transition:transform .16s ease,box-shadow .16s ease;
}
.ict-chapter-page .ict-grid>.ict-card:nth-child(5n+1),
.ict-chapter-page .ict-compare-grid>.ict-compare-card:nth-child(5n+1){border-top:4px solid var(--ch-purple-mid);background:linear-gradient(180deg,#faf7ff,#fff);}
.ict-chapter-page .ict-grid>.ict-card:nth-child(5n+2),
.ict-chapter-page .ict-compare-grid>.ict-compare-card:nth-child(5n+2){border-top:4px solid var(--ch-blue);background:linear-gradient(180deg,#f5f9ff,#fff);}
.ict-chapter-page .ict-grid>.ict-card:nth-child(5n+3),
.ict-chapter-page .ict-compare-grid>.ict-compare-card:nth-child(5n+3){border-top:4px solid var(--ch-teal);background:linear-gradient(180deg,#f1fbf8,#fff);}
.ict-chapter-page .ict-grid>.ict-card:nth-child(5n+4),
.ict-chapter-page .ict-compare-grid>.ict-compare-card:nth-child(5n+4){border-top:4px solid var(--ch-orange);background:linear-gradient(180deg,#fff8ee,#fff);}
.ict-chapter-page .ict-grid>.ict-card:nth-child(5n),
.ict-chapter-page .ict-compare-grid>.ict-compare-card:nth-child(5n){border-top:4px solid var(--ch-rose);background:linear-gradient(180deg,#fff6f8,#fff);}
.ict-chapter-page .ict-card h4,
.ict-chapter-page .ict-card h5,
.ict-chapter-page .ict-compare-card h3{color:var(--ch-purple-dark);}
.ict-chapter-page .ict-subsection>h3{
  color:var(--ch-purple-dark);
  display:flex;
  align-items:center;
  gap:10px;
}
.ict-chapter-page .ict-subsection>h3::before{
  content:"";
  width:10px;height:10px;border-radius:50%;
  flex:0 0 auto;
  background:var(--section-accent,var(--ch-purple));
  box-shadow:0 0 0 5px rgba(124,58,237,.09);
}

.ict-chapter-page .ict-bullet-list li:nth-child(4n+1)::before{background:var(--ch-purple-mid);box-shadow:0 0 0 4px rgba(124,58,237,.12);}
.ict-chapter-page .ict-bullet-list li:nth-child(4n+2)::before{background:var(--ch-blue);box-shadow:0 0 0 4px rgba(37,99,235,.10);}
.ict-chapter-page .ict-bullet-list li:nth-child(4n+3)::before{background:var(--ch-teal);box-shadow:0 0 0 4px rgba(15,118,110,.10);}
.ict-chapter-page .ict-bullet-list li:nth-child(4n)::before{background:var(--ch-orange);box-shadow:0 0 0 4px rgba(217,119,6,.10);}

.ict-chapter-page .ict-tag-row span:nth-child(4n+1){background:#f5f3ff;border-color:#ddd6fe;color:#5b21b6;}
.ict-chapter-page .ict-tag-row span:nth-child(4n+2){background:#eff6ff;border-color:#bfdbfe;color:#1d4ed8;}
.ict-chapter-page .ict-tag-row span:nth-child(4n+3){background:#ecfdf5;border-color:#a7f3d0;color:#047857;}
.ict-chapter-page .ict-tag-row span:nth-child(4n){background:#fff7ed;border-color:#fed7aa;color:#c2410c;}

.ict-chapter-page .ict-note-box{background:linear-gradient(90deg,#f5f3ff,#f8fbff);border-color:#d8c9fb;border-left-color:var(--ch-blue);}
.ict-chapter-page .ict-memory-box{background:linear-gradient(90deg,#f4efff,#fff);border-color:#d8c9fb;border-left-color:var(--ch-purple-dark);}
.ict-chapter-page .ict-footer-nav{background:linear-gradient(135deg,#f6f0ff,#fff 70%);border-color:#d8c9fb;}
.ict-chapter-page .ict-footer-nav a{background:linear-gradient(135deg,#5b21b6,#7c3aed);}
.ict-chapter-page .ict-footer-nav a.secondary{background:#fff;color:#5b21b6;border-color:#d8c9fb;}

@media (hover:hover) and (pointer:fine){
  .ict-chapter-page .ict-card:hover,.ict-chapter-page .ict-compare-card:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(76,29,149,.10);}
}
@media(max-width:700px){
  .ict-chapter-page .ict-topic-section>h2{padding-left:8px;padding-right:8px;}
}

/* Chapter-to-chapter navigation: matches other IGCSE360 subjects */
.ict-nav-disabled{opacity:.48;cursor:not-allowed;pointer-events:none;background:#eeeaf8!important;color:#756a8d!important;border-color:#ddd5ee!important;box-shadow:none!important;}