/* =========================================================
   GCSE Maths Category Page
   ========================================================= */

.category-page {
  background:
    radial-gradient(circle at top left, rgba(250, 204, 21, 0.15), transparent 28rem),
    radial-gradient(circle at top right, rgba(37, 99, 235, 0.14), transparent 30rem),
    linear-gradient(180deg, #eef4ff 0%, #f8fbff 45%, #ffffff 100%);
  padding: 3rem 1rem 4rem;
}

.category-page > * {
  width: min(1180px, 100%);
  margin-left: auto;
  margin-right: auto;
}

/* Hero */

.category-hero {
  background:
    linear-gradient(rgba(11, 18, 32, 0.78), rgba(17, 28, 52, 0.9)),
    url("/static/img/home/home_hero_normal.avif");
  background-size: cover;
  background-position: center;
  color: #ffffff;
  border-radius: 30px;
  padding: clamp(2rem, 5vw, 4rem);
  margin-bottom: 2rem;
  box-shadow: 0 24px 50px rgba(15, 23, 42, 0.24);
}

.topic-hero-content {
  max-width: 850px;
}

.topic-label {
  display: inline-flex;
  margin: 0 0 1rem;
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  background: rgba(250, 204, 21, 0.18);
  color: #facc15;
  font-weight: 800;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.category-hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(2.4rem, 5vw, 4.4rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
}

.category-hero p {
  max-width: 800px;
  margin: 0;
  color: #dbeafe;
  font-size: 1.1rem;
  line-height: 1.75;
}

/* Layout */

.topic-layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 1.5rem;
  align-items: start;
}

/* Sidebar */

.topic-sidebar {
  position: sticky;
  top: 90px;
}

.topic-sidebar nav {
  display: grid;
  gap: 0.55rem;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid #dbeafe;
  border-radius: 22px;
  padding: 1rem;
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
}

.topic-sidebar a {
  display: block;
  padding: 0.65rem 0.8rem;
  border-radius: 12px;
  color: #1e40af;
  background: #eef4ff;
  font-weight: 800;
  text-decoration: none;
  line-height: 1.3;
}

.topic-sidebar a:hover {
  background: #dbeafe;
  color: #0f172a;
}

/* Content */

.topic-content {
  display: grid;
  gap: 1.5rem;
}

.topic-section {
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid #dbeafe;
  border-radius: 26px;
  padding: clamp(1.35rem, 3vw, 2rem);
  box-shadow: 0 16px 36px rgba(15, 23, 42, 0.08);
}

.topic-section h2 {
  margin: 0 0 1rem;
  color: #1e40af;
  font-size: clamp(1.65rem, 3vw, 2.3rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.topic-section p,
.topic-section li {
  color: #475569;
  line-height: 1.75;
}

/* Topic cards */

.topics-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.topic-card {
  display: block;
  background: linear-gradient(180deg, #ffffff 0%, #f3f7ff 100%);
  border: 1px solid #bfdbfe;
  border-radius: 20px;
  padding: 1.2rem;
  text-decoration: none;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.07);
  transition: transform 0.18s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.topic-card:hover {
  transform: translateY(-4px);
  border-color: #93c5fd;
  box-shadow: 0 18px 36px rgba(37, 99, 235, 0.12);
}

.topic-card h3 {
  margin: 0 0 0.6rem;
  color: #0f172a;
  font-size: 1.18rem;
}

.topic-card p {
  margin: 0;
}

/* Learning order */

.learning-order-list {
  display: grid;
  gap: 0.8rem;
  margin-top: 1.2rem;
}

.learning-order-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
  background: #ffffff;
  border: 1px solid #bfdbfe;
  border-radius: 18px;
  padding: 1rem;
  text-decoration: none;
  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.06);
  transition: transform 0.18s ease, box-shadow 0.2s ease;
}

.learning-order-card:hover {
  transform: translateX(4px);
  box-shadow: 0 14px 30px rgba(37, 99, 235, 0.12);
}

.learning-order-card span {
  display: inline-flex;
  width: 2.2rem;
  height: 2.2rem;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: #facc15;
  color: #0f172a;
  font-weight: 900;
}

.learning-order-card h3 {
  margin: 0 0 0.35rem;
  color: #0f172a;
}

.learning-order-card p {
  margin: 0;
}

/* Lists */

.check-list,
.warning-list {
  display: grid;
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.check-list li,
.warning-list li {
  padding: 0.9rem 1rem;
  border-radius: 14px;
}

.check-list li {
  background: #ecfdf5;
  border-left: 5px solid #16a34a;
}

.warning-list li {
  background: #fffbeb;
  border-left: 5px solid #f59e0b;
}

/* FAQ */

.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.faq-card {
  background: #ffffff;
  border: 1px solid #bfdbfe;
  border-radius: 18px;
  padding: 1.1rem;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.06);
}

.faq-card h3 {
  margin: 0 0 0.6rem;
  color: #0f172a;
  font-size: 1.08rem;
}

.faq-card p {
  margin: 0;
}

/* Mobile */

@media (max-width: 900px) {
  .topic-layout {
    grid-template-columns: 1fr;
  }

  .topic-sidebar {
    position: static;
  }

  .topic-sidebar nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .topics-grid,
  .faq-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .category-page {
    padding: 2rem 1rem 3rem;
  }

  .topic-sidebar nav {
    grid-template-columns: 1fr;
  }
}