/* ============================================================
   Alumina Continuous Fiber — design system v2
   Modern B2B-industrial look. Pure CSS, no dependencies.
   ============================================================ */
:root {
  --navy: #0f2a43;
  --navy-deep: #0a1e32;
  --navy-soft: #16405f;
  --accent: #e8851a;
  --accent-dark: #c96f0e;
  --accent-soft: #fdf1e0;
  --ink: #1e2a38;
  --muted: #5a6b7d;
  --line: #e3e9f0;
  --soft: #f5f7fa;
  --soft-2: #eef2f7;
  --card: #ffffff;
  --ok: #1a7a4a;
  --warn: #b7791f;
  --radius: 12px;
  --maxw: 1120px;
  --shadow-sm: 0 1px 3px rgba(15, 42, 67, 0.10);
  --shadow-md: 0 4px 14px rgba(15, 42, 67, 0.12);
  --header-h: 64px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  color: var(--ink);
  background: #fff;
  line-height: 1.7;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; }
a { color: var(--navy-soft); text-decoration: underline; text-underline-offset: 2px; }
a:hover { color: var(--accent-dark); }

/* Skip link for keyboard users */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--navy-deep);
  padding: 0.6rem 1rem;
  z-index: 200;
  border-radius: 0 0 8px 0;
  text-decoration: none;
  font-weight: 700;
}
.skip-link:focus { left: 0; }

/* ============ Header ============ */
.site-header {
  background: linear-gradient(180deg, var(--navy) 0%, var(--navy-deep) 100%);
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.25);
  min-height: var(--header-h);
}
.header-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.25rem;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 1.25rem;
}
.brand {
  font-weight: 800;
  font-size: 1.12rem;
  color: #fff;
  text-decoration: none;
  letter-spacing: 0.2px;
  white-space: nowrap;
  line-height: 1.2;
  margin-right: auto;
}
.brand small {
  display: block;
  font-weight: 500;
  font-size: 0.66rem;
  color: #a9c2da;
  letter-spacing: 1.5px;
}
.brand:hover { color: #fff; }

/* Hamburger button (hidden on desktop) */
.nav-toggle {
  display: none;
  background: transparent;
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-radius: 8px;
  width: 44px;
  height: 44px;
  cursor: pointer;
  padding: 0;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav-toggle:hover { border-color: var(--accent); }
.nav-toggle:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

nav.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.1rem;
}
nav.main-nav a {
  color: #d7e5f3;
  text-decoration: none;
  padding: 0.5rem 0.65rem;
  border-radius: 8px;
  font-size: 0.87rem;
  font-weight: 500;
  white-space: nowrap;
  transition: background 0.15s ease, color 0.15s ease;
}
nav.main-nav a:hover { background: rgba(255, 255, 255, 0.12); color: #fff; }
nav.main-nav a[aria-current="page"] { background: rgba(232, 133, 26, 0.22); color: #ffd9a8; }

/* ============ Layout ============ */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 1.25rem; }
main { padding: 0 0 3.5rem; }
main > .wrap { padding-top: 1.75rem; }
article section { margin-bottom: 2.5rem; }

h1 {
  font-size: 2.1rem;
  line-height: 1.22;
  margin: 0.5rem 0 1rem;
  letter-spacing: -0.3px;
  color: var(--navy);
}
h2 {
  font-size: 1.5rem;
  line-height: 1.3;
  margin: 2.2rem 0 0.8rem;
  padding-bottom: 0.45rem;
  border-bottom: 3px solid var(--accent);
  color: var(--navy);
  letter-spacing: -0.2px;
}
h3 { font-size: 1.15rem; margin: 1.5rem 0 0.5rem; color: var(--navy-soft); }
h4 { font-size: 1.02rem; margin: 1.2rem 0 0.4rem; color: var(--navy-soft); }
p { margin: 0.75rem 0; }
.lead { font-size: 1.14rem; color: var(--muted); line-height: 1.65; }

/* Breadcrumb */
.breadcrumb { font-size: 0.82rem; color: var(--muted); margin: 0 0 1rem; }
.breadcrumb a { text-decoration: none; color: var(--muted); }
.breadcrumb a:hover { color: var(--accent-dark); }
.breadcrumb-light, .breadcrumb-light a { color: #c8d9ea; }

/* ============ Hero (homepage) ============ */
.hero {
  background:
    radial-gradient(1200px 400px at 80% -10%, rgba(232, 133, 26, 0.25), transparent 60%),
    linear-gradient(135deg, var(--navy-deep) 0%, var(--navy) 55%, #14385c 100%);
  color: #fff;
  padding: 3.5rem 0 3rem;
  margin-bottom: 0;
}
.hero h1 { color: #fff; font-size: 2.5rem; margin-top: 0.25rem; }
.hero .lead { color: #c8d9ea; max-width: 62ch; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 1.6rem; }
.hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 2.5rem; align-items: center; }
.market-panel {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 14px;
  padding: 1.4rem 1.5rem 1.2rem;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
}
.panel-title { font-size: 1.05rem; font-weight: 700; color: #fff; margin: 0 0 1rem; }
.panel-year { font-size: 0.78rem; font-weight: 400; color: #9db4cc; margin-left: 0.4rem; }
.stat-tiles { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-bottom: 1.1rem; }
.stat-tile { background: rgba(255, 255, 255, 0.07); border: 1px solid rgba(255, 255, 255, 0.1); border-radius: 10px; padding: 0.7rem 0.5rem; text-align: center; }
.stat-num { display: block; font-size: 1.45rem; font-weight: 800; color: var(--accent); }
.stat-label { font-size: 0.78rem; color: #b9cde2; }
.chart-title { font-size: 0.85rem; font-weight: 700; color: #dbe7f4; margin: 0 0 0.6rem; text-transform: uppercase; letter-spacing: 0.04em; }
.bar-chart { display: grid; gap: 0.55rem; margin-bottom: 1rem; }
.bar-row { display: grid; grid-template-columns: 7.5rem 1fr 3rem; align-items: center; gap: 0.6rem; }
.bar-name { font-size: 0.82rem; color: #c8d9ea; }
.bar-track { background: rgba(255, 255, 255, 0.12); border-radius: 6px; height: 10px; overflow: hidden; }
.bar-fill { background: linear-gradient(90deg, #f0a13a, var(--accent-dark)); height: 100%; border-radius: 6px; }
.bar-val { font-size: 0.85rem; font-weight: 700; color: #fff; text-align: right; }
.panel-countries { font-size: 0.85rem; color: #c8d9ea; margin: 0 0 0.6rem; }
.panel-countries strong { color: #fff; }
.panel-note { font-size: 0.75rem; color: #8fa5bd; margin: 0 0 0.8rem; line-height: 1.5; }
.panel-link { font-size: 0.88rem; font-weight: 700; color: var(--accent); text-decoration: none; }
.panel-link:hover { text-decoration: underline; }

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 10px;
  font-weight: 700;
  font-size: 1rem;
  text-decoration: none;
  transition: transform 0.12s ease, box-shadow 0.12s ease, background 0.12s ease;
  border: 2px solid transparent;
}
.btn-primary { background: var(--accent); color: var(--navy-deep); box-shadow: var(--shadow-md); }
.btn-primary:hover { background: var(--accent-dark); color: var(--navy-deep); transform: translateY(-1px); }
.btn-ghost { background: transparent; color: #fff; border-color: rgba(255, 255, 255, 0.55); }
.btn-ghost:hover { border-color: #fff; color: #fff; background: rgba(255, 255, 255, 0.08); }

/* ============ Cards ============ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.1rem;
  margin: 1.4rem 0;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.3rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.card h3 { margin-top: 0; font-size: 1.08rem; }
.card p { font-size: 0.94rem; color: var(--muted); margin-bottom: 0; }
.card .card-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  color: #96500a;
  background: var(--accent-soft);
  border-radius: 20px;
  padding: 0.15rem 0.65rem;
  margin-bottom: 0.55rem;
}

/* ============ Tables ============ */
.table-wrap {
  overflow-x: auto;
  margin: 1.25rem 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  -webkit-overflow-scrolling: touch;
}
table { border-collapse: collapse; width: 100%; font-size: 0.93rem; min-width: 560px; }
caption { text-align: left; font-weight: 700; padding: 0.75rem 1rem; color: var(--navy); background: var(--soft); }
th, td { text-align: left; padding: 0.7rem 0.9rem; border-bottom: 1px solid var(--line); vertical-align: top; }
thead th {
  background: var(--navy);
  color: #fff;
  font-weight: 700;
  white-space: nowrap;
  position: sticky;
  top: 0;
}
tbody tr:nth-child(even) { background: var(--soft); }
tbody tr:hover { background: #eaf1f8; }
tbody tr:last-child th, tbody tr:last-child td { border-bottom: none; }
td:first-child { font-weight: 600; }

/* ============ Callouts ============ */
.callout {
  background: var(--soft);
  border-left: 5px solid var(--navy-soft);
  border-radius: 0 10px 10px 0;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  box-shadow: var(--shadow-sm);
}
.callout.cta { border-left-color: var(--ok); background: #eef7f1; }
.callout.warning { border-left-color: var(--warn); background: #fdf6e7; }
.callout.tip { border-left-color: var(--accent); background: var(--accent-soft); }
.callout p { margin: 0.45rem 0; }
.callout p:first-child { margin-top: 0; }
.callout p:last-child { margin-bottom: 0; }

blockquote {
  border-left: 5px solid var(--accent);
  margin: 1.4rem 0;
  padding: 0.6rem 1.2rem;
  background: var(--accent-soft);
  border-radius: 0 10px 10px 0;
  font-style: italic;
  color: var(--navy-soft);
}

/* ============ Lists ============ */
ul.tight li, ol.tight li { margin-bottom: 0.45rem; }
ul.checklist { list-style: none; padding-left: 0; }
ul.checklist li { padding-left: 1.8rem; position: relative; margin-bottom: 0.5rem; }
ul.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.32em;
  width: 1em;
  height: 0.55em;
  border-left: 3px solid var(--ok);
  border-bottom: 3px solid var(--ok);
  transform: rotate(-45deg);
}

/* Pros / cons */
.pros-cons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.1rem;
  margin: 1.4rem 0;
}
.pros-cons > div {
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  border: 1px solid var(--line);
}
.pros-cons .pros { background: #eef7f1; border-top: 4px solid var(--ok); }
.pros-cons .cons { background: #fdf3ec; border-top: 4px solid var(--warn); }
.pros-cons h4 { margin-top: 0; }
.pros-cons ul { margin: 0.5rem 0 0; padding-left: 1.2rem; }
.pros-cons li { margin-bottom: 0.35rem; font-size: 0.95rem; }

/* Glossary */
dl.glossary { margin: 1.2rem 0; }
dl.glossary dt {
  font-weight: 700;
  color: var(--navy);
  margin-top: 0.9rem;
}
dl.glossary dd { margin: 0.25rem 0 0 0; color: var(--muted); }

/* Steps */
ol.steps { counter-reset: step; list-style: none; padding-left: 0; }
ol.steps > li {
  counter-increment: step;
  position: relative;
  padding: 1rem 1.2rem 1rem 4rem;
  margin-bottom: 0.9rem;
  background: var(--soft);
  border-radius: var(--radius);
  border: 1px solid var(--line);
}
ol.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 1.1rem;
  top: 1rem;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--navy);
  color: #fff;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
}
ol.steps > li strong { color: var(--navy); }

/* ============ Related links ============ */
.related {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1rem;
  margin: 1.4rem 0;
}
.related a {
  display: block;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.15rem;
  text-decoration: none;
  background: #fff;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.related a:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.related strong { display: block; margin-bottom: 0.25rem; color: var(--navy); }
.related span { font-size: 0.86rem; color: var(--muted); }

/* ============ FAQ ============ */
details.faq {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin: 0.7rem 0;
  padding: 0;
  background: #fff;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
details.faq summary {
  font-weight: 700;
  cursor: pointer;
  padding: 0.95rem 1.2rem;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--navy);
}
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary::before {
  content: "+";
  flex: 0 0 auto;
  width: 1.7rem;
  height: 1.7rem;
  border-radius: 50%;
  background: var(--accent-soft);
  color: #96500a;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  line-height: 1;
}
details.faq[open] summary::before { content: "–"; background: var(--accent); color: var(--navy-deep); }
details.faq summary:hover { background: var(--soft); }
details.faq summary:focus-visible { outline: 3px solid var(--accent); outline-offset: -3px; }
details.faq > p, details.faq > div { padding: 0 1.2rem 1.1rem 3.6rem; margin: 0; color: var(--ink); }

/* ============ Footer ============ */
.site-footer {
  background: linear-gradient(180deg, var(--navy-deep) 0%, #081625 100%);
  color: #c2d4e8;
  margin-top: 3rem;
}
.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2.75rem 1.25rem 2rem;
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 2rem;
}
.site-footer .footer-heading {
  color: #fff;
  margin: 0 0 0.8rem;
  font-size: 0.95rem;
  letter-spacing: 0.8px;
  text-transform: uppercase;
}
.site-footer .footer-heading::after {
  content: "";
  display: block;
  width: 2.2rem;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
  margin-top: 0.4rem;
}
.site-footer p { font-size: 0.9rem; line-height: 1.65; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 0.45rem; }
.site-footer a { color: #c2d4e8; text-decoration: none; font-size: 0.92rem; }
.site-footer a:hover { color: var(--accent); text-decoration: underline; }
.copyright {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 1.1rem 1.25rem;
  text-align: center;
  font-size: 0.82rem;
  color: #8ba3bd;
  max-width: var(--maxw);
  margin: 0 auto;
}

/* ============ Responsive ============ */
/* Tablet */
@media (max-width: 1024px) {
  .header-inner { gap: 0.9rem; }
  nav.main-nav a { font-size: 0.82rem; padding: 0.45rem 0.5rem; }
  h1 { font-size: 1.85rem; }
  .hero h1 { font-size: 2.15rem; }
}

/* Mobile nav: hamburger */
@media (max-width: 860px) {
  .nav-toggle { display: flex; }
  .header-inner { flex-wrap: wrap; padding-top: 0.6rem; padding-bottom: 0.6rem; }
  nav.main-nav { width: 100%; order: 3; }
  nav.main-nav ul {
    display: none;
    flex-direction: column;
    gap: 0;
    background: var(--navy-deep);
    border-radius: 10px;
    padding: 0.5rem;
    margin-top: 0.4rem;
    max-height: 70vh;
    overflow-y: auto;
  }
  nav.main-nav.open ul { display: flex; }
  nav.main-nav a {
    display: block;
    padding: 0.75rem 0.9rem;
    font-size: 0.95rem;
    border-radius: 8px;
  }
  nav.main-nav li + li { border-top: 1px solid rgba(255, 255, 255, 0.08); }
  .hero { padding: 2.5rem 0 2.25rem; }
  .hero h1 { font-size: 1.9rem; }
  .hero-grid { grid-template-columns: 1fr; gap: 1.75rem; }
  .pros-cons { grid-template-columns: 1fr; }
}

/* Small phones */
@media (max-width: 640px) {
  body { font-size: 16px; }
  h1 { font-size: 1.6rem; }
  h2 { font-size: 1.3rem; }
  .hero h1 { font-size: 1.7rem; }
  .lead { font-size: 1.05rem; }
  .footer-inner { grid-template-columns: 1fr; gap: 1.5rem; }
  .card-grid { grid-template-columns: 1fr; }
  .btn { width: 100%; text-align: center; }
  .hero-cta .btn { width: auto; }
  thead th { position: static; }
  details.faq > p, details.faq > div { padding-left: 1.2rem; }
}

@media print {
  .site-header, .site-footer, .nav-toggle, .hero-cta { display: none; }
  .hero { background: none; color: #000; padding: 0; }
  .hero h1, .hero .lead { color: #000; }
}