/* ── Base.css ── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
  font-size: 16px;
}
body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: var(--surface-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

html.loading body {
  opacity: 0;
}

body {
  opacity: 1;
  transition: opacity 0.2s ease;
}

img {
  max-width: 100%;
  display: block;
}
a {
  text-decoration: none;
  color: inherit;
}
ul,
ol {
  list-style: none;
}
address {
  font-style: normal;
}

/* ── Scrollbar ── */
::-webkit-scrollbar {
  width: 4px;
  height: 4px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border-default);
  border-radius: 999px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ── Focus ── */
:focus-visible {
  outline: 2px solid var(--brand-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ── STICKY HEADER WRAPPER ──
   #header is the injection target in every HTML file.
   It must be position:sticky so the header component
   inside it stops at the top when scrolling.
   The .site-header element itself is NOT sticky —
   only this wrapper is.
── */
#header {
  position: sticky;
  top: 0;
  z-index: 200;
  /* Ensure it renders above page content */
  isolation: isolate;
}

/* ── Scroll reveal ── */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 0.45s ease,
    transform 0.45s ease;
}
.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ── Utilities ── */
.container {
  max-width: 1400px;
  margin-inline: auto;
  padding-inline: 40px;
}
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ── Section labels / headings ── */
.section-label {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 2.4px;
  text-transform: uppercase;
  color: var(--brand-light);
  text-align: center;
  margin-bottom: 4px;
}
.section-heading {
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 700;
  /* color: var(--text-primary); */
  color:var(--h2-text);
  text-align: center;
  margin-bottom: 4px;
  letter-spacing: -0.72px;
}
.section-subheading {
  font-family: var(--font-sans);
  font-size: clamp(14px, 1.5vw, 16px);
  color: var(--text-muted);
  text-align: center;
  max-width: 640px;
  margin-inline: auto;
  margin-bottom: 48px;
}

/* ── Buttons ── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  /* background: var(--gradient-brand-h); */
  background: var(--gradient-accent);
  /* color: var(--text-on-brand); */
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition:
    opacity 0.2s,
    transform 0.15s;
  white-space: nowrap;
}
.btn-primary:hover {
  opacity: 0.88;
  transform: translateY(-1px);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--surface-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-brand-mid);
  cursor: pointer;
  box-shadow: var(--shadow-btn);
  transition:
    box-shadow 0.25s,
    transform 0.25s,
    border-color 0.25s;
}
.btn-outline:hover {
  border-color: rgba(0, 0, 0, 0.12);
  box-shadow:
    0px 2px 4px rgba(0, 0, 0, 0.1),
    0px 6px 12px rgba(0, 0, 0, 0.1);
  transform: translateY(-1px);
}

.btn-gold {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: var(--text-on-accent);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  padding: 8px 22px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: background 0.2s;
}
.btn-gold:hover {
  background: var(--accent-light);
}

/* ── Breadcrumb ── */
.breadcrumb {
  margin-bottom: 18px;
}
.breadcrumb__list {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.breadcrumb__item {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.6px;
  text-transform: uppercase;
}
.breadcrumb__link {
  color: var(--text-on-brand-dim);
  transition: color 0.2s;
}
.breadcrumb__link:hover {
  color: var(--text-on-brand-sub);
}
.breadcrumb__separator {
  color: var(--text-on-brand-dim);
  display: flex;
  align-items: center;
}
.breadcrumb__separator svg {
  width: 13px;
  height: 13px;
}

.breadcrumb__item--current {
  color: var(--accent);
}

/* ── DOI link ── */
.doi-link {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--link-color);
  word-break: break-all;
  transition: color 0.2s;
  font-weight: 600;
}
.doi-link:hover {
  color: var(--link-hover);
}

/* ── Citation toast ── */
.citation-toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--brand-dark);
  color: var(--text-on-brand);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  padding: 10px 22px;
  border-radius: 30px;
  display: flex;
  align-items: center;
  gap: 8px;
  opacity: 0;
  z-index: 2000;
  transition:
    opacity 0.3s ease,
    transform 0.3s ease;
  pointer-events: none;
  box-shadow: 0 4px 20px var(--glow-brand);
}
.citation-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* header Main menu dropdown */
.has-dropdown {
  position: relative;
}

.has-dropdown > a {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-arrow {
  width: 14px;
  height: 14px;
  transition: transform 0.25s ease;
}

.has-dropdown:hover .nav-arrow,
.has-dropdown.active .nav-arrow {
  transform: rotate(180deg);
}

.nav-dropdown {
  position: absolute;
  top: calc(100% + 5px);
  left: 0;

  background: var(--surface-primary);
  border-radius: 16px;

  padding: 6px;

  box-shadow: var(--shadow-md);

  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);

  transition: all 0.25s ease;

  z-index: 500;
}

.has-dropdown:hover .nav-dropdown,
.has-dropdown.active .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown a {
  display: block;

  padding: 10px 12px;

  border-radius: 10px;

  font-size: 14px;
  font-weight: 500;

  color: var(--text-primary);

  transition: all 0.2s ease;
}

.nav-dropdown a:hover {
  background: var(--nav-hover-bg);
  color: var(--brand-dark);
}

/* ── Mobile drawer (shared) ── */
.mobile-drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: min(320px, 85%);
  height: 100vh;
  background: var(--surface-primary);
  box-shadow: -8px 0 32px rgba(0, 0, 0, 0.15);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  padding: 24px 20px;
  overflow: hidden;

  /* Use transform instead of right for smooth animation */
  transform: translateX(100%);
  transition: transform 0.3s ease-in-out;
}

.mobile-drawer.open {
  transform: translateX(0);
}

.drawer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity 0.3s ease,
    visibility 0.3s;
}
.drawer-overlay.active {
  opacity: 1;
  visibility: visible;
}
.mobile-drawer__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 32px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-default);
}
.mobile-drawer__close {
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-mid);
  padding: 8px;
  display: flex;
  align-items: center;
}

.mobile-nav {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
}

.mobile-nav__list {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  /* remove the fixed margin-bottom so it fills available space */
  margin-bottom: 0;
  padding-bottom: 16px;
}
.mobile-nav__item a {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 400;
  color: var(--text-primary);
  display: block;
  padding: 10px 8px;
  border-radius: var(--radius-md);
  transition:
    color 0.2s,
    background 0.2s;
}
.mobile-nav__item a:hover,
.mobile-nav__item a.active {
  color: var(--brand-dark);
  background: var(--nav-hover-bg);
}
.mobile-drawer__cta {
  margin-top: auto;
  padding-top: 24px;
}
.mobile-submit-btn {
  width: 100%;
  justify-content: center;
}
.mobile-menu-btn {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--brand-dark);
  padding: 6px;
  align-items: center;
  justify-content: center;
}
.nav-submit-btn_menu-icon {
  display: flex;
  align-items: center;
  gap: 8px;
}

.mobile-dropdown {
  border-bottom: 1px solid var(--border-default);
}

.mobile-dropdown__trigger {
  width: 100%;
  background: transparent;
  border: none;

  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 400;
  color: var(--text-primary);
  display: block;
  padding: 10px 8px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}
.mobile-dropdown__trigger svg {
  color: var(--text-primary);
  font-weight: 400;
}
.mobile-arrow {
  width: 18px;
  height: 18px;
  flex-shrink: 0;

  transition: transform 0.25s ease;
}

.mobile-dropdown__content {
  display: grid;
  grid-template-rows: 0fr; /* collapsed */
  transition: grid-template-rows 0.3s ease;
}

.mobile-dropdown.open .mobile-dropdown__content {
    grid-template-rows: 1fr;          /* expanded */
}

.mobile-dropdown__inner {
  overflow: hidden;

  display: flex;
  flex-direction: column;
}

.mobile-dropdown__inner a {
  padding: 8px 12px 8px 20px;
  font-size: 14px;
  color: var(--text-muted);
  border-radius: var(--radius-lg);
  display: block;
}

.mobile-dropdown__inner a:hover {
  background: var(--nav-hover-bg);
  color: var(--brand-dark);
}


.mobile-dropdown.open .mobile-arrow {
  transform: rotate(180deg);
}

/* Mobile dropdown open indicator */
.mobile-dropdown__trigger {
  position: relative;
}

/* Highlight active/open dropdown trigger */
.mobile-dropdown.open .mobile-dropdown__trigger {
  color: var(--brand-dark);
}

.mobile-dropdown__trigger svg {
  pointer-events: none;
}

/* Indent sub-links and add left accent bar when open */
.mobile-dropdown.open .mobile-dropdown__inner {
  border-left: 2px solid var(--brand-accent, var(--accent));
  margin: 0 0 8px 8px;
}

/* ── Footer ── */
.site-footer {
  background: var(--footer-bg);
  padding: 56px 0 0;
}
.site-footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: 48px;
  max-width: 1400px;
  margin-inline: auto;
  padding-inline: 40px;
  padding-bottom: 48px;
}
.footer-brand__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.footer-brand__logo-icon {
  width: 100px;
  height: 100px;
  background: var(--accent);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--surface-primary);
  flex-shrink: 0;
}
.footer-brand__logo-icon svg {
  width: 18px;
  height: 18px;
}
.footer-brand__logo_head {
  display: flex;
  flex-direction: column;
}
.footer-brand__logo-name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-on-brand);
}
.footer-brand__logo-desc {
  font-family: var(--font-sans);
  font-size: 10px;
  color: var(--text-on-brand-dim);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}
.footer-brand__desc {
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--footer-text);
  margin-bottom: 20px;
  max-width: 280px;
  line-height: 1.65;
}

.footer-brand__desc .footer-brand_desc_title{
  font-weight: 600;
  font-size:18px;
  /* color: var(--accent); */
}
.footer-social {
  display: flex;
  gap: 10px;
}
.footer-social__link {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(254, 248, 234, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-on-brand-sub);
  transition:
    background 0.2s,
    color 0.2s;
}
.footer-social__link:hover {
  background: rgba(254, 248, 234, 0.2);
  color: var(--text-on-brand);
}
.footer-social__link svg {
  width: 14px;
  height: 14px;
}
.footer-col__heading {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--footer-heading);
  margin-bottom: 16px;
}
.footer-nav__list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.footer-nav__link {
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--footer-text);
  transition: color 0.2s;
}
.footer-nav__link:hover {
  color: var(--text-on-brand);
}
.footer-contact__item {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  font-family: var(--font-sans);
  font-size: 13.5px;
  color: var(--text-on-brand-sub);
  margin-bottom: 12px;
  line-height: 1.5;
}
.footer-contact__item svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--accent);
}
.site-footer__bottom {
  max-width: 1400px;
  margin-inline: auto;
  padding: 0 40px 16px;
}
.site-footer__bottom-inner {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 16px;
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--text-on-brand-dim);
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .mobile-menu-btn {
    display: flex;
  }
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}
@media (max-width: 768px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
    padding-inline: 24px;
    padding-bottom: 36px;
  }
  .site-footer__bottom {
    padding-inline: 24px;
  }
}
@media (max-width: 480px) {
  .site-footer__grid {
    grid-template-columns: 1fr;
    padding-inline: 16px;
    gap: 24px;
  }
  .site-footer__bottom {
    padding-inline: 16px;
  }
  .citation-toast {
    bottom: 16px;
    left: 16px;
    right: 16px;
    transform: translateX(0) translateY(80px);
    width: calc(100% - 32px);
    justify-content: center;
  }
  .citation-toast.show {
    transform: translateX(0) translateY(0);
  }
}

/* ── Desktop: hide mobile chrome ── */
@media (min-width: 1025px) {
  .mobile-drawer,
  .drawer-overlay,
  .mobile-menu-btn {
    display: none !important;
  }
  .primary-nav {
    display: block;
  }
}