/* === Customs Brokerage & HS Code Classification Workflows ===
 * Light, elegant, professional color scheme inspired by customs seals,
 * regulatory navy, and a touch of parchment.
 */

:root {
  --c-ink: #1a2433;
  --c-ink-soft: #41506a;
  --c-muted: #6b7a92;
  --c-paper: #fbfaf5;
  --c-paper-soft: #f3eedf;
  --c-card: #ffffff;
  --c-border: #e3dcc7;
  --c-border-strong: #c9bea1;

  --c-navy: #0f2a4a;
  --c-navy-2: #163b67;
  --c-gold: #c9a227;
  --c-gold-soft: #e2b83a;
  --c-teal: #1f8fa3;
  --c-teal-soft: #5bb6c5;
  --c-crimson: #a6342a;
  --c-emerald: #2f7d4f;

  --c-link: #0f2a4a;
  --c-link-hover: #1f8fa3;

  --c-code-bg: #f4efe1;
  --c-code-ink: #2a2014;
  --c-inline-code-bg: rgba(201, 162, 39, 0.14);
  --c-inline-code-ink: #6c4e10;

  --header-h: 68px;

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 18px;

  --shadow-sm: 0 1px 2px rgba(15, 42, 74, 0.06);
  --shadow: 0 6px 24px rgba(15, 42, 74, 0.10);
  --shadow-lg: 0 18px 48px rgba(15, 42, 74, 0.14);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Iowan Old Style", "Apple Garamond", Baskerville, Georgia, "Times New Roman", serif;
  --font-mono: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --measure: 78ch;
  --container: min(1400px, 92vw);
}

@media (min-width: 1600px) {
  :root { --container: min(1500px, 88vw); }
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  /* Push anchored targets below the sticky header. Belt-and-suspenders with
     scroll-margin-top on each heading. */
  scroll-padding-top: calc(var(--header-h) + 24px);
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  color: var(--c-ink);
  background: var(--c-paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--c-link);
  text-decoration: none;
  background-image: linear-gradient(currentColor, currentColor);
  background-size: 100% 1px;
  background-repeat: no-repeat;
  background-position: 0 100%;
  transition: color 160ms ease, background-size 200ms ease;
}
a:hover, a:focus {
  color: var(--c-link-hover);
  background-size: 100% 2px;
}
a:focus-visible { outline: 2px solid var(--c-teal); outline-offset: 3px; border-radius: 2px; }

::selection { background: var(--c-gold-soft); color: var(--c-navy); }

/* === Layout shell === */
.container { width: var(--container); margin: 0 auto; }
.site-main { flex: 1 1 auto; padding: 24px 0 64px; }

/* === Header === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(251, 250, 245, 0.92);
  backdrop-filter: saturate(160%) blur(10px);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--c-border);
  height: var(--header-h);
  display: flex;
  align-items: center;
}
.site-header .container {
  display: flex;
  align-items: center;
  gap: 24px;
  justify-content: space-between;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background-image: none !important;
  color: var(--c-navy);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.2px;
}
.brand:hover { color: var(--c-teal); }
.brand .brand-mark { height: 40px; width: 40px; flex: 0 0 40px; display: block; }
.brand .brand-text { display: inline-flex; flex-direction: column; line-height: 1.05; }
.brand .brand-text small {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-muted);
  font-family: var(--font-sans);
  font-weight: 600;
}

.site-nav { display: flex; align-items: center; gap: 4px; }
.site-nav a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  background-image: none !important;
  color: var(--c-ink-soft);
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 160ms ease, color 160ms ease, transform 160ms ease;
}
.site-nav a svg { width: 18px; height: 18px; flex: 0 0 18px; }
.site-nav a:hover { color: var(--c-navy); background: var(--c-paper-soft); }
.site-nav a.is-current {
  background: linear-gradient(135deg, rgba(31,143,163,0.14), rgba(201,162,39,0.18));
  color: var(--c-navy);
}
.site-nav a.is-current svg { color: var(--c-teal); }

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  cursor: pointer;
  color: var(--c-navy);
}

@media (max-width: 820px) {
  .nav-toggle { display: inline-flex; align-items: center; }
  .site-nav {
    position: absolute;
    top: var(--header-h);
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--c-paper);
    padding: 12px;
    border-bottom: 1px solid var(--c-border);
    box-shadow: var(--shadow);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 160ms ease, transform 160ms ease;
  }
  .site-nav.is-open { opacity: 1; transform: none; pointer-events: auto; }
  .site-nav a { padding: 12px 14px; }
}

/* === Footer === */
.site-footer {
  margin-top: auto;
  background: linear-gradient(180deg, var(--c-paper), var(--c-paper-soft));
  border-top: 1px solid var(--c-border);
  padding: 36px 0 24px;
  color: var(--c-ink-soft);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: start;
}
@media (min-width: 900px) {
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; }
}
.site-footer h4 {
  font-family: var(--font-serif);
  color: var(--c-navy);
  margin: 0 0 10px;
  font-size: 1.02rem;
}
.site-footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; }
.site-footer a { color: var(--c-ink-soft); }
.site-footer a:hover { color: var(--c-navy); }
.footer-bottom {
  margin-top: 28px;
  padding-top: 16px;
  border-top: 1px dashed var(--c-border-strong);
  font-size: 0.86rem;
  color: var(--c-muted);
}

/* === Breadcrumbs === */
.breadcrumbs {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 8px;
  padding: 0;
  margin: 0 0 20px;
  font-size: 0.88rem;
  color: var(--c-muted);
}
nav[aria-label="Breadcrumb"] { margin: 0; }
.breadcrumbs li { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumbs li + li::before {
  content: "›";
  color: var(--c-border-strong);
  font-weight: 700;
}
.breadcrumbs a { color: var(--c-ink-soft); background-image: none; }
.breadcrumbs a:hover { color: var(--c-teal); }
.breadcrumbs .crumb-current { color: var(--c-navy); font-weight: 600; }

/* === Headings === */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  color: var(--c-navy);
  line-height: 1.18;
  margin: 1.6em 0 0.55em;
  scroll-margin-top: calc(var(--header-h) + 16px);
}
h1 {
  font-size: clamp(1.85rem, 1.2rem + 2.6vw, 2.85rem);
  background: linear-gradient(120deg, var(--c-navy) 0%, var(--c-teal) 55%, var(--c-gold) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-top: 0;
  letter-spacing: -0.01em;
}
h2 {
  font-size: clamp(1.4rem, 1rem + 1.4vw, 1.85rem);
  padding-bottom: 0.25em;
  border-bottom: 1px solid var(--c-border);
}
h2 .heading-anchor, h3 .heading-anchor, h4 .heading-anchor {
  color: var(--c-border-strong);
  margin-right: 8px;
  text-decoration: none;
  background-image: none;
  opacity: 0;
  transition: opacity 120ms ease;
  font-weight: 400;
}
h2:hover .heading-anchor,
h3:hover .heading-anchor,
h4:hover .heading-anchor { opacity: 1; color: var(--c-teal); }
h3 { font-size: clamp(1.15rem, 0.95rem + 0.8vw, 1.4rem); color: var(--c-navy-2); }
h4 { font-size: 1.08rem; color: var(--c-navy-2); }

/* === Article === */
.article-body { min-width: 0; }
.article-body { min-width: 0; }
.article-body p { margin: 0 0 1.15em; }
.article-body ul, .article-body ol { padding-left: 1.4em; }
.article-body li { margin-bottom: 0.35em; }

/* Inline code */
.article-body code,
.article-body :not(pre) > code {
  background: var(--c-inline-code-bg);
  color: var(--c-inline-code-ink);
  padding: 1px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.92em;
  border: none;
}

/* Fenced code blocks */
.codeblock {
  position: relative;
  margin: 1.4em 0;
  background: var(--c-code-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.codeblock::before {
  content: attr(data-lang);
  position: absolute;
  top: 8px;
  left: 14px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-muted);
}
.codeblock pre {
  margin: 0;
  padding: 32px 16px 18px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--c-code-ink);
  background: transparent;
}
.codeblock pre code { background: transparent !important; padding: 0; color: inherit; }
.copy-btn {
  position: absolute;
  top: 6px;
  right: 8px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 9px;
  font-size: 0.74rem;
  font-weight: 600;
  font-family: var(--font-sans);
  color: var(--c-navy);
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 140ms ease, color 140ms ease, transform 140ms ease;
}
.copy-btn:hover { background: var(--c-navy); color: #fff; }
.copy-btn.copied { background: var(--c-emerald); color: #fff; border-color: var(--c-emerald); }
.copy-btn:focus-visible { outline: 2px solid var(--c-teal); outline-offset: 2px; }

/* Prism light overrides */
.codeblock .token.comment, .codeblock .token.prolog, .codeblock .token.cdata { color: #8b7e5a; font-style: italic; }
.codeblock .token.keyword, .codeblock .token.boolean, .codeblock .token.atrule { color: #0f2a4a; font-weight: 600; }
.codeblock .token.string, .codeblock .token.char, .codeblock .token.attr-value { color: #2f7d4f; }
.codeblock .token.number, .codeblock .token.constant { color: #a6342a; }
.codeblock .token.function, .codeblock .token.class-name { color: #1f8fa3; }
.codeblock .token.operator, .codeblock .token.punctuation { color: #41506a; }
.codeblock .token.tag, .codeblock .token.attr-name, .codeblock .token.builtin { color: #c9a227; }
.codeblock .token.deleted { color: #a6342a; }
.codeblock .token.inserted { color: #2f7d4f; }

/* Tables */
.table-wrap { overflow-x: auto; border: 1px solid var(--c-border); border-radius: var(--radius); margin: 1.4em 0; }
.table-wrap table { width: 100%; border-collapse: collapse; font-size: 0.94rem; }
.table-wrap th, .table-wrap td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--c-border); }
.table-wrap th { background: var(--c-paper-soft); font-family: var(--font-serif); color: var(--c-navy); }
.table-wrap tr:nth-child(even) td { background: rgba(243, 238, 223, 0.4); }
.table-wrap tr:last-child td { border-bottom: none; }

/* Task lists rendered from markdown */
.article-body ul.contains-task-list,
.article-body ol.contains-task-list {
  list-style: none;
  padding-left: 0;
}
.article-body li.task-list-item {
  position: relative;
  padding-left: 30px;
  margin-bottom: 0.45em;
}
.article-body li.task-list-item::marker { content: ""; }
.article-body li.task-list-item input.task-list-item-checkbox {
  position: absolute;
  left: 0;
  top: 6px;
  width: 18px;
  height: 18px;
  accent-color: var(--c-teal);
  cursor: pointer;
}
.article-body li.task-list-item input.task-list-item-checkbox:checked ~ * { text-decoration: line-through; color: var(--c-muted); }
/* Inline state: when the input is checked, line-through the following inline content */
.article-body li.task-list-item input.task-list-item-checkbox:checked + * { text-decoration: line-through; color: var(--c-muted); }
.article-body li.task-list-item input.task-list-item-checkbox:checked {
  filter: none;
}
.article-body li.task-list-item.task-done > label,
.article-body li.task-list-item.task-done { text-decoration: line-through; color: var(--c-muted); }

/* FAQ accordions (auto-generated and hand-authored) */
.faq-accordion { margin: 1.4em 0; display: grid; gap: 10px; }
.faq-accordion details {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 0;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.faq-accordion summary {
  cursor: pointer;
  padding: 14px 18px;
  font-weight: 600;
  font-family: var(--font-serif);
  color: var(--c-navy);
  font-size: 1.02rem;
  list-style: none;
  position: relative;
  padding-right: 44px;
  transition: background 140ms ease;
}
.faq-accordion summary::-webkit-details-marker { display: none; }
.faq-accordion summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.5rem;
  color: var(--c-teal);
  transition: transform 160ms ease;
  font-weight: 400;
}
.faq-accordion details[open] summary::after { content: "−"; }
.faq-accordion summary:hover { background: var(--c-paper-soft); }
.faq-accordion details > *:not(summary) { padding: 0 18px 16px; }

/* Mermaid block container — used while the source is unrendered and after */
pre.mermaid,
.mermaid-rendered {
  background: linear-gradient(180deg, #ffffff, var(--c-paper));
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 22px 18px;
  margin: 1.6em 0;
  text-align: center;
  overflow-x: auto;
  box-shadow: var(--shadow-sm);
}
pre.mermaid {
  font-family: var(--font-mono);
  color: var(--c-muted);
  font-size: 0.86rem;
  text-align: left;
}
.mermaid-rendered svg {
  max-width: 100%;
  height: auto;
  display: inline-block;
}
.mermaid-rendered .label,
.mermaid-rendered .nodeLabel {
  font-family: var(--font-sans) !important;
  font-weight: 500;
}

/* KaTeX scoping */
.katex { font-size: 1.05em; }
.katex-display { overflow-x: auto; overflow-y: hidden; padding: 6px 0; }

/* === Article meta strip === */
.article-meta {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
  padding: 0;
  margin: 0 0 14px;
  font-size: 0.82rem;
  color: var(--c-muted);
}
.article-meta li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--c-paper-soft);
  border: 1px solid var(--c-border);
  border-radius: 999px;
  font-feature-settings: "tnum" 1;
}
.article-meta svg { color: var(--c-teal); }

/* === Page table of contents === */
.page-toc {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 0;
  margin: 0 0 24px;
  box-shadow: var(--shadow-sm);
  font-size: 0.94rem;
  overflow: hidden;
}
.page-toc:not(.is-populated) { display: none; }
.page-toc summary {
  cursor: pointer;
  list-style: none;
  padding: 12px 18px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--c-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background 140ms ease;
}
.page-toc summary:hover { background: var(--c-paper-soft); }
.page-toc summary::-webkit-details-marker { display: none; }
.page-toc summary::after {
  content: "▾";
  color: var(--c-teal);
  font-size: 0.9rem;
  transition: transform 160ms ease;
}
.page-toc[open] summary::after { transform: rotate(-180deg); }
.page-toc .toc-list {
  list-style: none;
  padding: 4px 12px 12px;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  border-top: 1px solid var(--c-border);
}
@media (min-width: 900px) {
  .page-toc .toc-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1400px) {
  .page-toc .toc-list { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
.page-toc a {
  display: block;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  background-image: none;
  color: var(--c-ink-soft);
  border-left: 2px solid transparent;
  line-height: 1.35;
  transition: background 140ms ease, color 140ms ease, border-color 140ms ease, transform 140ms ease;
}
.page-toc .toc-h2 > a { font-weight: 600; }
.page-toc .toc-h3 > a { padding-left: 22px; font-size: 0.92em; color: var(--c-muted); }
.page-toc a:hover {
  background: var(--c-paper-soft);
  color: var(--c-navy);
  transform: translateX(1px);
}
.page-toc a.toc-active {
  color: var(--c-navy);
  background: linear-gradient(90deg, rgba(31,143,163,0.12), transparent);
  border-left-color: var(--c-teal);
}

/* === Related pages — card row at the bottom of every content page === */
.related-pages {
  margin: 48px 0 0;
  padding-top: 28px;
  border-top: 1px solid var(--c-border);
}
.related-pages h2 {
  margin: 0 0 16px;
  font-size: 1.1rem;
  border-bottom: none;
  color: var(--c-navy);
}
.related-pages ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
}
@media (min-width: 700px) { .related-pages ul { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1100px) { .related-pages ul { grid-template-columns: repeat(3, 1fr); } }
.related-pages a {
  display: block;
  padding: 14px 16px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  background: var(--c-card);
  background-image: none;
  color: var(--c-ink-soft);
  font-size: 0.96rem;
  box-shadow: var(--shadow-sm);
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease, color 160ms ease;
}
.related-pages a:hover {
  color: var(--c-navy);
  border-color: var(--c-border-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

/* === Front page === */
.hero {
  text-align: center;
  padding: 8px 0 28px;
}
.hero .hero-logo {
  display: block;
  margin: 0 auto 22px;
  width: clamp(140px, 18vw, 220px);
  height: auto;
  filter: drop-shadow(0 14px 30px rgba(15, 42, 74, 0.18));
  transition: transform 320ms ease;
}
.hero:hover .hero-logo { transform: rotate(-2deg) scale(1.02); }
.hero h1 { margin-bottom: 12px; }
.hero .tagline {
  max-width: 760px;
  margin: 0 auto 8px;
  font-size: 1.12rem;
  color: var(--c-ink-soft);
}
.hero .lead {
  max-width: 820px;
  margin: 14px auto 0;
  font-size: 1rem;
  color: var(--c-ink-soft);
}

.cta-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 32px auto 8px;
  max-width: 1100px;
}
@media (min-width: 700px) {
  .cta-row { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1100px) {
  .cta-row { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
.cta {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 20px;
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  background-image: none;
  color: var(--c-ink);
  transition: transform 200ms ease, box-shadow 200ms ease, border-color 200ms ease;
}
.cta:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--c-border-strong); color: var(--c-navy); }
.cta-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}
.cta-icon.navy { background: linear-gradient(135deg, #0f2a4a, #1f8fa3); }
.cta-icon.gold { background: linear-gradient(135deg, #e2b83a, #c9a227); color: #4a3a0e; }
.cta-icon.teal { background: linear-gradient(135deg, #1f8fa3, #5bb6c5); }
.cta-icon.crimson { background: linear-gradient(135deg, #a6342a, #d05044); }
.cta-icon svg { width: 22px; height: 22px; }
.cta strong { font-family: var(--font-serif); color: var(--c-navy); font-size: 1.08rem; }
.cta span.cta-desc { color: var(--c-ink-soft); font-size: 0.94rem; }

.section-block { margin: 56px 0; }
.section-block h2 { margin-top: 0; }
.section-block .intro { max-width: 820px; color: var(--c-ink-soft); }

.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 22px;
}
@media (min-width: 720px) { .card-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1100px) { .card-grid { grid-template-columns: repeat(3, 1fr); } }
.card {
  display: block;
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 18px 20px;
  text-decoration: none;
  background-image: none;
  color: var(--c-ink);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow); border-color: var(--c-border-strong); }
.card strong { font-family: var(--font-serif); color: var(--c-navy); display: block; margin-bottom: 6px; font-size: 1.05rem; }
.card span { color: var(--c-ink-soft); font-size: 0.94rem; }

/* Utilities */
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}