/* MTC Knowledge Center — isolated additions for articles.html and /articles/*.html */

.knowledge-page,
.article-page {
  background: var(--ice);
}

.knowledge-header .main-nav {
  gap: clamp(12px, 1.6vw, 24px);
  font-size: 12px;
}

.knowledge-header .main-nav a[aria-current="page"] {
  color: var(--white);
}

.knowledge-header .main-nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

.knowledge-whatsapp {
  display: flex;
  align-items: center;
  gap: 10px;
}

a.knowledge-whatsapp:hover strong,
a.knowledge-whatsapp:focus-visible strong {
  color: var(--cyan-500);
}

.knowledge-whatsapp strong {
  color: var(--white);
  font: 700 11px/1.5 "IRANSansX", Tahoma, sans-serif;
}

.knowledge-whatsapp b {
  color: var(--cyan-500);
  font: 700 12px/1 "IRANSansX", Tahoma, sans-serif;
  letter-spacing: .01em;
}

.knowledge-lang {
  display: flex;
  align-items: center;
  gap: 6px;
  direction: ltr;
  color: #819ca6;
  font: 700 10px/1 Arial, sans-serif;
}

.knowledge-lang span,
.knowledge-lang a.is-active {
  color: var(--white);
}

.knowledge-lang i {
  width: 1px;
  height: 14px;
  background: rgba(255,255,255,.28);
}

.knowledge-lang a:hover {
  color: var(--white);
}

.knowledge-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(86px, 9vw, 138px) clamp(72px, 8vw, 112px);
  color: var(--white);
  background:
    radial-gradient(circle at 12% 20%, rgba(25,194,217,.18), transparent 29%),
    linear-gradient(135deg, var(--navy-950), var(--navy-850));
}

.knowledge-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .16;
  background-image:
    linear-gradient(rgba(25,194,217,.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(25,194,217,.16) 1px, transparent 1px);
  background-size: 74px 74px;
  mask-image: linear-gradient(90deg, #000, transparent 74%);
}

.knowledge-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(270px, .42fr);
  align-items: end;
  gap: clamp(38px, 8vw, 110px);
}

.knowledge-hero h1 {
  max-width: 850px;
  margin: 0;
  font-size: clamp(42px, 6.2vw, 78px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -.045em;
  text-wrap: balance;
}

.knowledge-hero__lead {
  max-width: 790px;
  margin: 24px 0 0;
  color: #b6cdd4;
  font-size: clamp(14px, 1.5vw, 17px);
  line-height: 2.05;
}

.knowledge-hero__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.13);
  border-radius: 18px;
  background: rgba(255,255,255,.1);
}

.knowledge-hero__stats div {
  min-height: 128px;
  display: flex;
  flex-direction: column;
  justify-content: end;
  padding: 20px;
  background: rgba(4,18,27,.62);
}

.knowledge-hero__stats strong {
  color: var(--cyan-500);
  font: 900 34px/1 "IRANSansX", Tahoma, sans-serif;
}

.knowledge-hero__stats span {
  margin-block-start: 9px;
  color: #9eb9c2;
  font-size: 10px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 24px;
  padding: 0;
  color: #88a8b2;
  font-size: 10px;
  list-style: none;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb li:not(:last-child)::after {
  content: "←";
  color: var(--cyan-500);
}

.breadcrumb a:hover {
  color: var(--white);
}

.knowledge-toolbar {
  position: relative;
  z-index: 4;
  margin-block-start: -33px;
}

.knowledge-search {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 16px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--white);
  box-shadow: var(--shadow-md);
}

.knowledge-search label {
  display: flex;
  align-items: center;
  min-height: 54px;
  padding-inline: 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--ice);
}

.knowledge-search svg {
  flex: 0 0 auto;
  color: var(--cyan-700);
}

.knowledge-search input {
  min-width: 0;
  flex: 1;
  border: 0;
  outline: 0;
  padding-inline: 12px;
  color: var(--ink);
  background: transparent;
  font-size: 12px;
}

.knowledge-search__count {
  min-width: 132px;
  padding-inline: 12px;
  color: var(--muted);
  font-size: 10px;
  text-align: center;
}

.knowledge-filters {
  display: flex;
  gap: 8px;
  margin-block: 24px 36px;
  overflow-x: auto;
  scrollbar-width: none;
}

.knowledge-filters::-webkit-scrollbar {
  display: none;
}

.knowledge-filter {
  flex: 0 0 auto;
  min-height: 40px;
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: #58737d;
  background: var(--white);
  font-size: 10px;
  font-weight: 700;
  cursor: pointer;
}

.knowledge-filter:hover,
.knowledge-filter.is-active {
  color: var(--white);
  border-color: var(--navy-900);
  background: var(--navy-900);
}

.knowledge-main {
  padding-block: 0 clamp(90px, 10vw, 140px);
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.article-card {
  position: relative;
  overflow: hidden;
  min-width: 0;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--white);
  transition: transform .24s var(--ease), box-shadow .24s, border-color .24s;
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: #bddfe7;
  box-shadow: var(--shadow-md);
}

.article-card[hidden] {
  display: none;
}

.article-card__visual {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: linear-gradient(145deg, #f8fcfd, #e6f2f5);
}

.article-card__visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  mix-blend-mode: multiply;
  transition: transform .45s var(--ease);
}

.article-card:hover .article-card__visual img {
  transform: scale(1.04);
}

.article-card__number {
  position: absolute;
  inset-block-start: 14px;
  inset-inline-start: 14px;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 1px solid rgba(255,255,255,.4);
  border-radius: 10px;
  color: var(--white);
  background: rgba(7,26,38,.8);
  backdrop-filter: blur(10px);
  font: 800 10px/1 "IRANSansX", Arial, sans-serif;
}

.article-card__body {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 24px;
}

.article-card__meta,
.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  color: #718a93;
  font-size: 9px;
}

.article-card__category,
.article-category {
  display: inline-flex;
  align-items: center;
  min-height: 27px;
  padding: 4px 10px;
  border-radius: 999px;
  color: var(--cyan-800);
  background: var(--cyan-100);
  font-size: 9px;
  font-weight: 800;
}

.article-card h2 {
  margin: 17px 0 0;
  color: var(--navy-900);
  font-size: 19px;
  font-weight: 900;
  line-height: 1.65;
  letter-spacing: -.025em;
  text-wrap: balance;
}

.article-card p {
  margin: 11px 0 20px;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.95;
}

.article-card__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-block-start: auto;
  padding-block-start: 16px;
  border-top: 1px solid var(--line);
  color: var(--navy-900);
  font-size: 10px;
  font-weight: 800;
}

.article-card__link i {
  color: var(--cyan-600);
  font-style: normal;
  font-size: 17px;
}

.knowledge-empty {
  margin: 50px auto;
  color: var(--muted);
  text-align: center;
}

.knowledge-empty[hidden] {
  display: none;
}

/* Individual article */
.article-progress {
  position: fixed;
  z-index: 200;
  inset-block-start: 0;
  inset-inline: 0;
  height: 3px;
  pointer-events: none;
}

.article-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan-500), var(--amber));
}

.article-hero {
  position: relative;
  overflow: hidden;
  color: var(--white);
  background: var(--navy-950);
}

.article-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 15% 20%, rgba(25,194,217,.16), transparent 28%),
    linear-gradient(120deg, transparent, rgba(25,194,217,.04));
}

.article-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, .62fr);
  align-items: center;
  gap: clamp(36px, 7vw, 100px);
  min-height: 570px;
  padding-block: clamp(70px, 8vw, 112px);
}

.article-hero h1 {
  max-width: 850px;
  margin: 18px 0 0;
  font-size: clamp(36px, 5.2vw, 64px);
  font-weight: 900;
  line-height: 1.33;
  letter-spacing: -.045em;
  text-wrap: balance;
}

.article-hero__summary {
  max-width: 800px;
  margin: 22px 0 20px;
  color: #b4cbd3;
  font-size: 14px;
  line-height: 2.05;
}

.article-hero .article-meta {
  color: #8daab3;
}

.article-hero__visual {
  position: relative;
  overflow: hidden;
  aspect-ratio: 1 / .86;
  border: 1px solid rgba(255,255,255,.13);
  border-radius: 26px;
  background: linear-gradient(145deg, #edf8fa, #dcebef);
  box-shadow: 0 35px 90px rgba(0,0,0,.3);
}

.article-hero__visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  mix-blend-mode: multiply;
}

.article-hero__visual::after {
  content: "MTC";
  position: absolute;
  inset-inline-end: 20px;
  inset-block-end: 18px;
  color: rgba(7,26,38,.24);
  font: 900 22px/1 Arial, sans-serif;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  align-items: start;
  gap: clamp(34px, 6vw, 82px);
  padding-block: clamp(62px, 8vw, 110px);
}

.article-content {
  min-width: 0;
  max-width: 850px;
  padding: clamp(28px, 4vw, 56px);
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--white);
  box-shadow: 0 16px 50px rgba(7,26,38,.06);
}

.article-content__intro {
  margin-block-end: 40px;
  padding-block-end: 34px;
  border-bottom: 1px solid var(--line);
}

.article-content p,
.article-content li,
.faq-item p {
  color: #314d58;
  font-size: 14px;
  line-height: 2.15;
}

.article-content p {
  margin: 0 0 18px;
}

.article-content__intro p:first-child::first-letter {
  float: right;
  margin: 7px 0 0 10px;
  color: var(--cyan-700);
  font-size: 54px;
  font-weight: 900;
  line-height: .8;
}

.article-section {
  scroll-margin-top: 110px;
  margin-block-start: 48px;
}

.article-section h2,
.article-faq h2,
.article-related h2 {
  margin: 0 0 22px;
  color: var(--navy-900);
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 900;
  line-height: 1.55;
  letter-spacing: -.03em;
}

.article-section h3 {
  margin: 30px 0 13px;
  color: var(--navy-800);
  font-size: 18px;
  font-weight: 800;
}

.article-section ul,
.article-section ol {
  margin: 20px 0 25px;
  padding: 0 25px 0 0;
}

.article-section li {
  margin-block-end: 9px;
  padding-inline-start: 6px;
}

.article-section li::marker {
  color: var(--cyan-700);
  font-weight: 900;
}

.article-note {
  position: relative;
  margin-block: 28px;
  padding: 21px 24px;
  border-inline-start: 4px solid var(--cyan-500);
  border-radius: 12px;
  color: #234450;
  background: var(--cyan-100);
  font-size: 12px;
  line-height: 2;
}

.article-note strong {
  display: block;
  margin-block-end: 5px;
  color: var(--cyan-800);
  font-size: 11px;
}

.article-warning {
  border-inline-start-color: var(--amber);
  background: #fff6e7;
}

.article-warning strong {
  color: #79500b;
}

.article-table-wrap {
  margin-block: 28px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 14px;
}

.article-table {
  width: 100%;
  min-width: 580px;
  border-collapse: collapse;
  font-size: 11px;
}

.article-table th,
.article-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  text-align: start;
  vertical-align: top;
}

.article-table th {
  color: var(--navy-900);
  background: var(--ice);
  font-weight: 800;
}

.article-table tr:last-child td {
  border-bottom: 0;
}

.article-table td {
  color: #47636d;
  line-height: 1.8;
}

.article-cta {
  position: relative;
  overflow: hidden;
  margin-block: 50px 15px;
  padding: 30px;
  border-radius: 18px;
  color: var(--white);
  background: var(--navy-900);
}

.article-cta::after {
  content: "";
  position: absolute;
  width: 180px;
  height: 180px;
  inset-inline-end: -55px;
  inset-block-end: -100px;
  border-radius: 50%;
  background: rgba(25,194,217,.13);
}

.article-cta h2 {
  position: relative;
  z-index: 1;
  margin: 0;
  color: var(--white);
  font-size: 22px;
}

.article-cta p {
  position: relative;
  z-index: 1;
  max-width: 660px;
  margin: 12px 0 21px;
  color: #a9c2ca;
  font-size: 12px;
}

.article-cta__links {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.article-cta__links a {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 9px 15px;
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 9px;
  color: #dcecef;
  font-size: 10px;
  font-weight: 800;
  transition: .2s;
}

.article-cta__links a:first-child {
  color: var(--navy-950);
  border-color: var(--cyan-500);
  background: var(--cyan-500);
}

.article-cta__links a:hover {
  border-color: var(--cyan-500);
}

.article-sidebar {
  position: sticky;
  inset-block-start: 96px;
}

.article-toc,
.article-contact-box {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--white);
  box-shadow: var(--shadow-sm);
}

.article-toc strong,
.article-contact-box strong {
  display: block;
  margin-block-end: 14px;
  color: var(--navy-900);
  font-size: 11px;
}

.article-toc ol {
  margin: 0;
  padding: 0;
  counter-reset: toc;
  list-style: none;
}

.article-toc li {
  counter-increment: toc;
}

.article-toc a {
  display: grid;
  grid-template-columns: 23px 1fr;
  gap: 8px;
  padding-block: 9px;
  border-bottom: 1px solid var(--line);
  color: #54717b;
  font-size: 9px;
  line-height: 1.75;
}

.article-toc li:last-child a {
  border-bottom: 0;
}

.article-toc a::before {
  content: counter(toc, decimal-leading-zero);
  color: var(--cyan-700);
  font: 800 8px/1.8 "IRANSansX", Arial, sans-serif;
}

.article-toc a:hover,
.article-toc a.is-active {
  color: var(--navy-900);
}

.article-contact-box {
  margin-block-start: 14px;
  color: #607a84;
  font-size: 9px;
  line-height: 1.9;
}

a.article-contact-box {
  display: block;
  transition: border-color .2s, transform .2s, box-shadow .2s;
}

a.article-contact-box:hover,
a.article-contact-box:focus-visible {
  border-color: var(--cyan-500);
  box-shadow: 0 12px 28px rgba(12, 84, 104, .09);
  transform: translateY(-2px);
}

.article-contact-box b {
  display: block;
  margin-block-start: 12px;
  color: var(--cyan-800);
  font: 800 14px/1.4 "IRANSansX", Tahoma, sans-serif;
}

.article-faq {
  margin-block-start: 64px;
  padding-block-start: 46px;
  border-top: 1px solid var(--line);
}

.faq-list {
  display: grid;
  gap: 10px;
}

.faq-item {
  border: 1px solid var(--line);
  border-radius: 13px;
  background: var(--ice);
}

.faq-item summary {
  padding: 17px 19px;
  color: var(--navy-900);
  font-size: 12px;
  font-weight: 800;
  cursor: pointer;
}

.faq-item p {
  margin: 0;
  padding: 0 19px 18px;
  font-size: 12px;
}

.article-related {
  margin-block-start: 65px;
}

.article-related__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.article-related__card {
  min-width: 0;
  display: flex;
  flex-direction: column;
  min-height: 155px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--ice);
  transition: .2s;
}

.article-related__card:hover {
  border-color: var(--cyan-500);
  background: var(--white);
}

.article-related__card small {
  color: var(--cyan-800);
  font-size: 8px;
}

.article-related__card strong {
  margin-block: 9px auto;
  color: var(--navy-900);
  font-size: 11px;
  line-height: 1.8;
}

.article-related__card span {
  color: #6d858e;
  font-size: 8px;
}

.knowledge-footer .footer__top {
  grid-template-columns: 1.5fr .8fr .9fr 1fr;
}

.knowledge-footer .footer__contact-number {
  color: var(--cyan-500);
  font: 800 14px/1.4 "IRANSansX", Tahoma, sans-serif;
}

.knowledge-footer .footer__contact small {
  max-width: 180px;
  line-height: 1.8;
}

@media (max-width: 1100px) {
  .knowledge-header .main-nav { gap: 12px; }
  .knowledge-header .main-nav a { font-size: 10px; }
  .article-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .article-hero__inner { grid-template-columns: minmax(0, 1fr) minmax(280px, .52fr); }
  .article-layout { grid-template-columns: minmax(0, 1fr) 235px; gap: 32px; }
}

@media (max-width: 900px) {
  .knowledge-header .main-nav {
    position: fixed;
    z-index: 100;
    inset: calc(var(--header-h) + 42px) 14px auto;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px;
    border: 1px solid var(--line-dark);
    border-radius: 16px;
    background: rgba(4,18,27,.98);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-12px);
    transition: .2s;
  }
  .knowledge-header .main-nav.is-open { opacity: 1; pointer-events: auto; transform: none; }
  .knowledge-header .main-nav a { padding: 12px 10px; border-bottom: 1px solid var(--line-dark); font-size: 12px; }
  .knowledge-header .menu-toggle { display: grid; }
  .knowledge-lang { display: none; }
  .knowledge-hero__inner { grid-template-columns: 1fr; }
  .knowledge-hero__stats { max-width: 440px; }
  .article-hero__inner { grid-template-columns: 1fr; min-height: 0; }
  .article-hero__visual { max-width: 580px; width: 100%; }
  .article-layout { grid-template-columns: 1fr; }
  .article-sidebar { position: relative; inset: auto; order: -1; }
  .article-toc ol { columns: 2; column-gap: 24px; }
  .article-toc li { break-inside: avoid; }
  .knowledge-footer .footer__top { grid-template-columns: 1fr 1fr; }
  .knowledge-footer .footer__brand { grid-column: span 2; }
  .knowledge-footer .footer__contact { grid-column: span 2; }
}

@media (max-width: 620px) {
  .knowledge-whatsapp strong { display: none; }
  .knowledge-whatsapp b { font-size: 10px; }
  .knowledge-hero { padding-block-start: 68px; }
  .knowledge-hero h1 { font-size: 38px; }
  .knowledge-hero__stats div { min-height: 105px; padding: 16px; }
  .knowledge-search { grid-template-columns: 1fr; gap: 8px; }
  .knowledge-search__count { padding-block: 4px; }
  .article-grid { grid-template-columns: 1fr; }
  .article-card h2 { font-size: 18px; }
  .article-hero__inner { padding-block: 55px 70px; }
  .article-hero h1 { font-size: 34px; }
  .article-hero__visual { border-radius: 19px; }
  .article-content { padding: 24px 19px; border-radius: 18px; }
  .article-content p,
  .article-content li { font-size: 13px; }
  .article-content__intro p:first-child::first-letter { font-size: 46px; }
  .article-section h2 { font-size: 24px; }
  .article-toc ol { columns: 1; }
  .article-related__grid { grid-template-columns: 1fr; }
  .article-related__card { min-height: 0; }
  .article-cta { padding: 24px 20px; }
  .knowledge-footer .footer__top { grid-template-columns: 1fr; }
  .knowledge-footer .footer__brand,
  .knowledge-footer .footer__contact { grid-column: auto; }
}

@media print {
  .announcement,
  .site-header,
  .article-sidebar,
  .article-progress,
  .knowledge-footer,
  .back-to-top,
  .article-cta { display: none !important; }
  .article-hero { color: #000; background: #fff; }
  .article-hero__inner { min-height: 0; grid-template-columns: 1fr; padding-block: 25px; }
  .article-hero__summary,
  .article-hero .article-meta { color: #333; }
  .article-hero__visual { display: none; }
  .article-layout { display: block; padding: 0; }
  .article-content { max-width: none; border: 0; box-shadow: none; }
}