/* PostaTracking.org — theme: clean, postal blue/yellow, fully responsive */
:root {
  --blue: #003399;
  --blue-dark: #002266;
  --yellow: #ffcc00;
  --ink: #1c2333;
  --muted: #5b6577;
  --line: #e2e6ee;
  --bg: #f5f7fb;
  --card: #ffffff;
  --ok: #1a7f43;
  --radius: 12px;
  --wrap: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; font-family: var(--font); color: var(--ink);
  background: var(--bg); line-height: 1.65; font-size: 17px;
}
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }
a { color: var(--blue); }
img { max-width: 100%; height: auto; }
h1, h2, h3 { line-height: 1.25; color: var(--ink); }
h1 { font-size: 2rem; margin: .2em 0 .5em; }
h2 { font-size: 1.4rem; margin: 1.8em 0 .5em; }
h3 { font-size: 1.12rem; margin: 1.4em 0 .4em; }
p { margin: .7em 0; }
table { border-collapse: collapse; width: 100%; margin: 1em 0; font-size: .96rem; }
th, td { border: 1px solid var(--line); padding: 9px 12px; text-align: left; vertical-align: top; }
th { background: #eef1f8; }
ul, ol { padding-left: 1.3em; }
li { margin: .3em 0; }
code { background: #eef1f8; padding: 1px 6px; border-radius: 5px; font-size: .92em; }
.sr-only, .skip-link {
  position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0);
}
.skip-link:focus {
  position: static; width: auto; height: auto; background: var(--yellow);
  padding: 8px 14px; display: inline-block;
}

/* ---------- header / nav ---------- */
.site-header { background: var(--blue); position: sticky; top: 0; z-index: 50; }
.nav { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.brand {
  color: #fff; font-weight: 700; font-size: 1.15rem; text-decoration: none;
  padding: 14px 0; display: flex; align-items: center; gap: 8px;
}
.brand-mark {
  background: var(--yellow); color: var(--blue); font-weight: 800;
  border-radius: 6px; padding: 2px 7px; font-size: .95rem;
}
.nav-links { display: flex; gap: 4px; flex-wrap: wrap; }
.nav-links a {
  color: #fff; text-decoration: none; padding: 10px 12px; border-radius: 7px;
  font-size: .95rem; font-weight: 500;
}
.nav-links a:hover { background: var(--blue-dark); }
.nav-toggle {
  display: none; background: none; border: 0; color: #fff; font-size: 1.5rem;
  cursor: pointer; padding: 8px;
}

/* ---------- hero ---------- */
.hero {
  background: linear-gradient(135deg, var(--blue), var(--blue-dark));
  color: #fff; padding: 38px 0 30px;
}
.hero h1 { color: #fff; margin-top: 0; font-size: 2.1rem; }
.hero-sub { color: #d6deff; font-size: 1.08rem; max-width: 640px; }

/* ---------- tracking tool ---------- */
.tracker {
  background: var(--card); border: 1px solid var(--line); border-top: 4px solid var(--yellow);
  border-radius: var(--radius); padding: 22px; margin: -28px 0 26px;
  box-shadow: 0 8px 28px rgba(0,30,90,.10);
}
.article .tracker { margin: 22px 0; }
.tracker-h { margin: 0 0 4px; font-size: 1.35rem; }
.tracker-sub { margin: 0 0 14px; color: var(--muted); font-size: .96rem; }
.tracker-form { display: flex; gap: 10px; flex-wrap: wrap; }
.tracker-form input {
  flex: 1 1 240px; padding: 13px 14px; font-size: 1rem; border: 1px solid #c4ccdc;
  border-radius: 9px; min-width: 0;
}
.tracker-form input:focus { outline: 3px solid #b9c7ff; border-color: var(--blue); }
.tracker-form button {
  padding: 13px 26px; font-size: 1rem; font-weight: 700; cursor: pointer;
  background: var(--blue); color: #fff; border: 0; border-radius: 9px;
}
.tracker-form button:hover { background: var(--blue-dark); }
.tracker-err {
  background: #fff2f2; border: 1px solid #ffc9c9; color: #9b1c1c;
  padding: 10px 13px; border-radius: 8px; margin: 12px 0 0; font-size: .94rem;
}
.tracker-note { font-size: .82rem; color: var(--muted); margin: 12px 0 0; }
.tracker-result { margin-top: 14px; }
.tr-card {
  background: #f3f6ff; border: 1px solid #d4ddf6; border-radius: 10px; padding: 16px;
}
.tr-code, .tr-service { margin: 2px 0; }
.tr-hint { color: var(--muted); font-size: .92rem; margin: 6px 0 12px; }
.tr-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 11px 18px; border-radius: 9px; font-weight: 700;
  text-decoration: none; font-size: .95rem;
}
.btn-primary { background: var(--yellow); color: var(--blue-dark); }
.btn-primary:hover { background: #ffd633; }
.btn-ghost { background: #fff; color: var(--blue); border: 1px solid #c4ccdc; }
.tr-disclaimer { font-size: .8rem; color: var(--muted); margin: 12px 0 0; }
.tr-loading { color: var(--muted); }

/* ---------- progress animation ---------- */
.tr-progress {
  background: #f3f6ff; border: 1px solid #d4ddf6; border-radius: 10px; padding: 16px 18px;
}
.tr-step {
  margin: 0 0 10px; font-weight: 700; color: var(--blue-dark); font-size: 1rem;
}
.tr-step::before {
  content: ""; display: inline-block; width: 14px; height: 14px; margin-right: 8px;
  border: 3px solid #c4ccdc; border-top-color: var(--blue); border-radius: 50%;
  vertical-align: -2px; animation: tr-spin .7s linear infinite;
}
.tr-bar {
  height: 12px; background: #e2e6ee; border-radius: 7px; overflow: hidden;
}
.tr-bar > span {
  display: block; height: 100%; width: 0;
  background: linear-gradient(90deg, var(--blue), #2f6fe0, var(--blue));
  border-radius: 7px; transition: width .2s linear;
}
.tr-prow {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 8px; font-size: .85rem; color: var(--muted);
}
.tr-percent { font-weight: 700; color: var(--blue); }
.tr-ok {
  margin: 0 0 8px; color: var(--ok); font-weight: 700; font-size: .98rem;
}
.tr-done { animation: tr-fade .4s ease; }
@keyframes tr-spin { to { transform: rotate(360deg); } }
@keyframes tr-fade {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .tr-step::before { animation: none; }
  .tr-bar > span { transition: none; }
  .tr-done { animation: none; }
}
.tr-events { margin: 8px 0 0; }
.tr-events li span { color: var(--muted); font-size: .88rem; margin-right: 6px; }

/* ---------- cards ---------- */
.card-grid {
  display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  margin: 14px 0 8px;
}
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px 18px; text-decoration: none; color: var(--ink); transition: .15s;
}
.card:hover { border-color: var(--blue); box-shadow: 0 6px 20px rgba(0,30,90,.10); }
.card h3 { margin: 0 0 6px; color: var(--blue); }
.card p { margin: 0; font-size: .92rem; color: var(--muted); }

/* ---------- article ---------- */
.article { padding: 24px 0 10px; }
.breadcrumb { font-size: .85rem; color: var(--muted); margin: 4px 0 10px; }
.breadcrumb a { color: var(--muted); }
.breadcrumb .sep { margin: 0 4px; }
.meta-row {
  display: flex; gap: 16px; flex-wrap: wrap; font-size: .85rem; color: var(--muted);
  border-bottom: 1px solid var(--line); padding-bottom: 12px; margin-bottom: 14px;
}
.section-intro { font-size: 1.05rem; }
.answer-box {
  background: #fff8db; border: 1px solid #f0dd8c; border-left: 4px solid var(--yellow);
  padding: 14px 16px; border-radius: 8px; margin: 16px 0;
}
.toc {
  background: var(--card); border: 1px solid var(--line); border-radius: 10px;
  padding: 14px 18px; margin: 18px 0;
}
.toc h2 { margin: 0 0 6px; font-size: 1.05rem; }
.toc ol { margin: 0; }
.toc a { text-decoration: none; }

/* ---------- faq ---------- */
.faq-item {
  border: 1px solid var(--line); border-radius: 9px; padding: 4px 16px;
  margin: 10px 0; background: var(--card);
}
.faq-item h3 { margin: 12px 0 4px; font-size: 1.04rem; }
.faq-a { margin-bottom: 12px; }
.faq-a p { margin: .4em 0; }

/* ---------- related ---------- */
.related-block { margin-top: 26px; }
.related { display: flex; flex-wrap: wrap; gap: 10px; }
.related a {
  background: var(--card); border: 1px solid var(--line); border-radius: 8px;
  padding: 9px 14px; text-decoration: none; font-size: .92rem; font-weight: 500;
}
.related a:hover { border-color: var(--blue); }

/* ---------- callout ---------- */
.callout {
  background: #eef4ff; border: 1px solid #cfdcfb; border-radius: 9px;
  padding: 12px 16px; margin: 14px 0;
}
.callout.warn { background: #fff6ed; border-color: #f4d4ad; }

/* ---------- footer ---------- */
.site-footer {
  background: var(--blue-dark); color: #c6cfe6; margin-top: 44px;
  padding: 30px 0 22px; font-size: .9rem;
}
.footer-cols {
  display: grid; gap: 22px; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}
.footer-cols strong { color: #fff; display: block; margin-bottom: 8px; }
.footer-cols a { color: #c6cfe6; text-decoration: none; display: block; padding: 2px 0; }
.footer-cols a:hover { color: #fff; }
.footer-cols p { margin: 0; }
.footer-legal {
  border-top: 1px solid #1c3a7a; margin-top: 22px; padding-top: 16px; font-size: .82rem;
}
.footer-legal a { color: var(--yellow); }

/* ---------- responsive ---------- */
@media (max-width: 760px) {
  body { font-size: 16px; }
  h1, .hero h1 { font-size: 1.65rem; }
  .nav-toggle { display: block; }
  .nav-links {
    display: none; flex-direction: column; width: 100%; padding: 6px 0 12px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 11px 6px; }
  .tracker { margin-top: 18px; }
  .tracker-form button { flex: 1 1 100%; }
}