:root {
  --paper: #0b2545;
  --panel: #123a66;
  --ink: #f3f7fb;
  --muted: #9fb4cc;
  --copy: #d9e6f2;
  --line: #2f5586;
  --accent: #e8a33d;
  --accent-soft: #f4c871;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; font-size: 118.75%; }
body {
  margin: 0;
  font-family: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.5;
}
code, .mono { font-family: "IBM Plex Mono", ui-monospace, Menlo, monospace; }

a { color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

header {
  padding: 8px 28px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  column-gap: 20px;
  align-items: center;
  border-bottom: 1px solid var(--line);
}
header a.logo {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-self: start;
}
.logo-icon {
  border-radius: 12px;
  display: block;
  flex-shrink: 0;
}
header a.logo .logo-icon { height: 110px; width: 110px; }
header nav {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  align-items: baseline;
  justify-content: center;
  justify-self: center;
}
header nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: 1.35rem;
  font-weight: 600;
}
header nav a:hover { color: var(--ink); }

main { max-width: 1120px; margin: 0 auto; padding: 0 28px 100px; }

/* ---------------- Hero ---------------- */
.hero { padding: 48px 0 40px; border-bottom: 1px solid var(--line); margin-bottom: 48px; }
.code-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0 18px;
  margin: 0 0 28px;
  padding: 0;
  list-style: none;
  overflow-x: auto;
}
.code-strip li {
  font-family: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  font-size: 0.92rem;
  white-space: nowrap;
  border-left: 2px solid var(--accent-soft);
  padding-left: 8px;
}
.code-strip li a {
  color: #c9972a;
  text-decoration: none;
}
.code-strip li a:hover {
  color: #e0ad3f;
  text-decoration: underline;
  text-decoration-color: var(--accent-soft);
}
.hero h1 {
  font-size: clamp(1.5rem, 2.6vw, 2.15rem);
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin: 0 0 16px;
  max-width: none;
  font-weight: 700;
}
.hero p {
  color: var(--ink);
  font-weight: 500;
  font-size: 1.02rem;
  max-width: none;
  margin: 0;
}

/* ---------------- Filter bar ---------------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 20px;
  margin-bottom: 36px;
}
.search-input {
  font-family: inherit;
  font-size: 1rem;
  padding: 10px 14px;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  flex: 1 1 240px;
  min-width: 200px;
  max-width: 340px;
}
.search-input::placeholder { color: var(--muted); }
.search-input:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.cat-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.cat-pill {
  font-family: inherit;
  font-size: 0.92rem;
  padding: 8px 14px;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--muted);
  cursor: pointer;
}
.cat-pill:hover { border-color: var(--accent-soft); color: var(--ink); }
.cat-pill.active {
  border-color: var(--accent);
  color: var(--ink);
  background: var(--panel);
  font-weight: 600;
}
.no-results {
  display: none;
  color: var(--muted);
  font-size: 1.05rem;
  padding: 48px 0;
  text-align: center;
}
.no-results.visible { display: block; }
@media (max-width: 640px) {
  .filter-bar { flex-direction: column; align-items: stretch; }
  .search-input { max-width: none; }
}

/* ---------------- Catalog grid ---------------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 32px 24px;
}
.exam { display: flex; flex-direction: column; }
.exam-cover {
  position: relative;
  aspect-ratio: 896 / 1200;
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: 5px 5px 0 var(--line);
  overflow: hidden;
  margin-bottom: 14px;
}
.exam-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.exam-cover.placeholder {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: var(--panel);
  color: var(--ink);
  border-top: 5px solid var(--accent-soft);
  padding: 18px;
}
.exam-cover.placeholder .ph-brand {
  font-size: 0.88rem;
  text-transform: none;
  color: var(--muted);
}
.exam-cover.placeholder .ph-code {
  font-family: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  font-size: 1.3rem;
  line-height: 1.3;
  font-weight: 600;
  word-break: break-word;
}
.exam-code {
  font-family: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  font-size: 0.88rem;
  color: var(--accent);
  margin-bottom: 4px;
  display: block;
}
.exam-info h3 {
  margin: 0 0 10px;
  font-size: 1.12rem;
  line-height: 1.4;
  font-weight: 600;
}
.exam-info h3 a { text-decoration: none; }
.exam-info h3 a:hover { text-decoration: underline; text-decoration-color: var(--accent-soft); }
.exam-info .row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.price {
  font-family: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  font-size: 1.18rem;
  font-weight: 600;
}

a.btn, button.btn {
  display: inline-block;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  padding: 11px 18px;
  font-weight: 600;
  font-size: 1.02rem;
  border: none;
  cursor: pointer;
  text-align: center;
}
a.btn:hover, button.btn:hover { background: var(--accent); }
a.btn:disabled, button.btn:disabled { opacity: 0.6; cursor: default; }

a.link { color: var(--muted); text-decoration: none; font-size: 1rem; }
a.link:hover { color: var(--ink); }

/* ---------------- Product detail ---------------- */
.product-detail { max-width: 920px; margin: 0 auto; padding-top: 36px; }
.back-link { display: inline-block; margin-bottom: 28px; }
.product-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 40px;
  align-items: start;
}
.product-layout .exam-cover { margin-bottom: 0; }
.product-main h1 {
  font-size: 1.8rem;
  line-height: 1.32;
  margin: 0 0 8px;
  font-weight: 700;
}
.product-main .price { font-size: 1.65rem; margin: 10px 0 22px; }
.product-main p.body-copy { color: var(--copy); font-size: 1.1rem; margin: 0 0 24px; max-width: 56ch; }
#buy-status { margin-top: 10px; }

.description {
  max-width: 68ch;
  margin-top: 48px;
  padding-top: 40px;
  border-top: 1px solid var(--line);
}
.description .hook {
  font-size: 1.45rem;
  line-height: 1.42;
  font-weight: 600;
  color: var(--ink);
  max-width: 32ch;
  margin: 0 0 22px;
}
.description p { color: var(--copy); font-size: 1.08rem; margin: 0 0 20px; }
.description h2 {
  font-size: 1.22rem;
  font-weight: 600;
  color: var(--ink);
  margin: 36px 0 16px;
}
.feature-list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.feature-list li {
  padding-left: 18px;
  font-size: 1.08rem;
  border-left: 2px solid var(--accent-soft);
  color: var(--copy);
}
.feature-list li strong { color: var(--ink); font-weight: 600; }

.topics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin: 0 0 20px;
}
.topic-group h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 10px;
}
.topic-list {
  list-style: disc;
  margin: 0;
  padding-left: 1.2em;
  color: var(--copy);
  font-size: 1.08rem;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.topic-list li::marker { color: var(--accent-soft); }
.topic-list li strong { color: var(--ink); font-weight: 600; }
@media (max-width: 640px) {
  .topics { grid-template-columns: 1fr; gap: 24px; }
}

.disclaimer {
  margin-top: 48px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.6;
}

/* ---------------- Site footer ---------------- */
.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 60px;
  padding: 48px 28px 32px;
  color: var(--muted);
  font-size: 0.95rem;
}
.footer-top {
  max-width: 1120px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 32px;
}
.footer-brand p { margin: 0; max-width: 32ch; line-height: 1.55; }
.footer-col h4 {
  margin: 0 0 14px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink);
}
.footer-col a {
  display: block;
  text-decoration: none;
  color: var(--muted);
  margin-bottom: 10px;
}
.footer-col a:hover { color: var(--ink); }
.footer-bottom {
  max-width: 1120px;
  margin: 0 auto;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  font-size: 0.85rem;
}

/* ---------------- Simple content pages (legal, contact) ---------------- */
.simple-page { max-width: 760px; margin: 0 auto; padding-top: 36px; }
.simple-page h1 {
  font-size: 2rem;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
  font-weight: 700;
}
.simple-page .updated { color: var(--muted); font-size: 0.92rem; margin: 0 0 40px; }
.simple-page .intro { color: var(--copy); font-size: 1.1rem; margin: 0 0 40px; max-width: 58ch; }
.simple-page h2 { font-size: 1.22rem; font-weight: 600; color: var(--ink); margin: 40px 0 14px; }
.simple-page h3 { font-size: 1.04rem; font-weight: 600; color: var(--ink); margin: 28px 0 10px; }
.simple-page p { color: var(--copy); font-size: 1.05rem; margin: 0 0 18px; line-height: 1.6; max-width: 62ch; }
.simple-page ul {
  color: var(--copy);
  font-size: 1.05rem;
  line-height: 1.6;
  padding-left: 1.2em;
  margin: 0 0 18px;
  max-width: 62ch;
}
.simple-page li { margin-bottom: 8px; }
.simple-page a { color: var(--accent); text-decoration: underline; }
.faq-list { margin: 0 0 40px; }
.faq-item {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 4px 20px;
  margin-bottom: 14px;
}
.faq-item summary {
  cursor: pointer;
  list-style: none;
  padding: 16px 32px 16px 0;
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--ink);
  position: relative;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 14px;
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--accent);
}
.faq-item[open] summary::after { content: "−"; }
.faq-item summary:hover { color: var(--accent-soft); }
.faq-item .faq-answer { padding: 0 0 18px; }
.faq-item .faq-answer p { margin: 0; max-width: none; }
.contact-points {
  list-style: none;
  padding: 0;
  margin: 0 0 36px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.contact-points li {
  padding-left: 18px;
  border-left: 2px solid var(--accent-soft);
  font-size: 1.05rem;
  color: var(--copy);
}
.contact-points li strong { color: var(--ink); font-weight: 600; display: block; margin-bottom: 2px; }

.blog-cta {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 24px 28px;
  margin: 32px 0;
  max-width: 62ch;
}
.blog-cta p { margin: 0 0 14px; max-width: none; }
.blog-cta .btn { display: inline-block; }
.blog-related {
  list-style: none;
  padding: 0;
  margin: 0 0 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.blog-related li a {
  display: inline-block;
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  text-decoration: none;
  color: var(--ink);
  font-size: 0.95rem;
}
.blog-related li a:hover { border-color: var(--accent); color: var(--accent); }
.blog-index-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 28px; }
.blog-index-list li { border-bottom: 1px solid var(--line); padding-bottom: 28px; }
.blog-index-list h2 { margin: 0 0 8px; font-size: 1.3rem; }
.blog-index-list h2 a { color: var(--ink); text-decoration: none; }
.blog-index-list h2 a:hover { color: var(--accent); }
.blog-index-list p { margin: 0; max-width: 62ch; }

.preview-q {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 24px 28px;
  margin: 0 0 20px;
  max-width: 68ch;
}
.preview-q .q-meta { color: var(--muted); font-size: 0.85rem; margin: 0 0 10px; text-transform: none; }
.preview-q .stem { color: var(--ink); font-weight: 600; font-size: 1.05rem; margin: 0 0 16px; max-width: none; }
.preview-q .options { list-style: none; padding: 0; margin: 0 0 16px; display: flex; flex-direction: column; gap: 8px; }
.preview-q .options li { color: var(--copy); font-size: 1rem; }
.preview-q details { margin-top: 10px; }
.preview-q summary {
  cursor: pointer;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 10px 0;
}
.preview-q .rationale { margin-top: 12px; padding-top: 14px; border-top: 1px solid var(--line); }
.preview-q .rationale p { font-size: 0.96rem; max-width: none; margin: 0 0 12px; color: var(--copy); }

@media (max-width: 760px) {
  .footer-top { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 640px) {
  header { padding: 18px 20px; }
  main { padding: 0 20px 80px; }
  .product-layout { grid-template-columns: 1fr; }
  .product-layout .exam-cover { max-width: 260px; }
  .footer-top { grid-template-columns: 1fr; }
}