/* ==========================================================================
   Components — buttons, header/nav, footer, cards, stats, and shared UI
   ========================================================================== */

/* ---------------------------------- Buttons ---------------------------------- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0.95rem 1.9rem;
  font-family: var(--font-body);
  font-size: var(--fs-small);
  font-weight: 600;
  letter-spacing: 0.02em;
  border-radius: var(--radius-pill);
  transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out), background-color var(--dur-base) var(--ease-out), color var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out);
  white-space: nowrap;
}

.btn svg {
  width: 16px;
  height: 16px;
  transition: transform var(--dur-base) var(--ease-out);
}

.btn:hover svg {
  transform: translateX(3px);
}

.btn-primary {
  background: var(--color-forest-500);
  color: var(--color-white);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: var(--color-forest-600);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.btn-gold {
  background: var(--color-gold-500);
  color: var(--color-forest-900);
}

.btn-gold:hover {
  background: var(--color-gold-400);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-forest-500);
  color: var(--color-forest-600);
  transform: translateY(-2px);
}

.section--dark .btn-outline,
.btn-outline-light {
  color: var(--color-white);
  border: 1.5px solid var(--color-border-on-dark);
}

.section--dark .btn-outline:hover,
.btn-outline-light:hover {
  border-color: var(--color-gold-400);
  color: var(--color-gold-400);
}

.btn-text {
  padding: 0.4rem 0;
  border-radius: 0;
  color: var(--color-forest-600);
  border-bottom: 1.5px solid currentColor;
}

.section--dark .btn-text {
  color: var(--color-gold-400);
}

.btn-text:hover {
  gap: var(--space-4);
}

/* ---------------------------------- Header ---------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  padding-block: var(--space-6);
  transition: padding var(--dur-base) var(--ease-out), background-color var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out);
  border-bottom: 1px solid transparent;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.site-header.is-scrolled {
  padding-block: var(--space-3);
  background: rgba(10, 38, 32, 0.82);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06), var(--shadow-md);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.brand img {
  /* Uses the white silhouette variant of the mark (paxventus-mark-light.png)
     -- the full-color version's darker teal tones read almost identically
     to the dark header/footer background and mostly disappear there. The
     white cutout stays crisp against any background without needing a
     backing chip. */
  height: 40px;
  width: auto;
}

.site-footer .brand img {
  height: 32px;
}

.brand-wordmark {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.brand-wordmark strong {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--color-white);
}

.brand-wordmark span {
  font-size: 0.6rem;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-gold-400);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-7);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-list > li {
  position: relative;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) 0;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-on-dark);
  opacity: 0.86;
  transition: opacity var(--dur-fast) var(--ease-out);
}

.nav-link:hover,
.nav-item.is-open .nav-link {
  opacity: 1;
  color: var(--color-gold-400);
}

.nav-link svg {
  width: 12px;
  height: 12px;
  transition: transform var(--dur-fast) var(--ease-out);
}

.nav-item.is-open .nav-link svg {
  transform: rotate(180deg);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

/* Mega menu */
.mega-menu {
  position: absolute;
  top: calc(100% + var(--space-5));
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  width: min(560px, 80vw);
  padding: var(--space-6);
  background: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-2);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out), visibility var(--dur-base);
}

.nav-item.is-open .mega-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.mega-menu a {
  display: block;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  transition: background-color var(--dur-fast) var(--ease-out);
}

.mega-menu a:hover {
  background: var(--color-mist-100);
}

.mega-menu strong {
  display: block;
  font-family: var(--font-display);
  font-size: 0.95rem;
  color: var(--color-forest-700);
}

.mega-menu span {
  display: block;
  margin-top: 2px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.nav-toggle {
  display: none;
  position: relative;
  z-index: calc(var(--z-header) + 1);
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--color-white);
  transition: transform var(--dur-fast) var(--ease-out), opacity var(--dur-fast) var(--ease-out);
}

@media (max-width: 960px) {
  .main-nav {
    position: fixed;
    inset: 0;
    top: 0;
    background: var(--color-forest-900);
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    gap: var(--space-8);
    padding: var(--space-10) var(--space-7);
    transform: translateX(100%);
    transition: transform var(--dur-slow) var(--ease-in-out);
  }

  body.nav-open .main-nav {
    transform: translateX(0);
  }

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-5);
    width: 100%;
  }

  .nav-link {
    font-size: 1.3rem;
  }

  .mega-menu {
    position: static;
    transform: none;
    width: 100%;
    grid-template-columns: 1fr;
    box-shadow: none;
    background: var(--color-forest-800);
    display: none;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav-item.is-open .mega-menu {
    display: grid;
    transform: none;
  }

  .mega-menu strong { color: var(--color-white); }
  .mega-menu a:hover { background: rgba(255,255,255,0.06); }

  .nav-toggle {
    display: flex;
  }

  body.nav-open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  body.nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
  body.nav-open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

/* ---------------------------------- Footer ---------------------------------- */
.site-footer {
  background: var(--color-forest-900);
  color: var(--color-text-on-dark);
  padding-block: var(--space-11) var(--space-6);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: var(--space-8);
  padding-bottom: var(--space-9);
  border-bottom: 1px solid var(--color-border-on-dark);
}

@media (max-width: 900px) {
  .footer-top {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  .footer-top {
    grid-template-columns: 1fr;
  }
}

.footer-brand p {
  margin-top: var(--space-4);
  max-width: 34ch;
  color: var(--color-text-on-dark-muted);
}

.footer-col h4 {
  font-size: 0.85rem;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-gold-400);
  margin-bottom: var(--space-5);
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-col a {
  color: var(--color-text-on-dark-muted);
  font-size: 0.92rem;
  transition: color var(--dur-fast) var(--ease-out);
}

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

.footer-social {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

.footer-social a {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--color-border-on-dark);
  transition: border-color var(--dur-fast), background-color var(--dur-fast);
}

.footer-social a:hover {
  border-color: var(--color-gold-400);
  background: rgba(201, 162, 76, 0.1);
}

.footer-social svg {
  width: 16px;
  height: 16px;
}

.footer-affiliation {
  /* footer-top already has its own border-bottom directly above this --
     adding a second border-top here rendered as a doubled/thick line. */
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding-top: var(--space-6);
}

.footer-affiliation span {
  font-size: 0.78rem;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-text-on-dark-muted);
}

.footer-affiliation img {
  height: 44px;
  width: auto;
  background: var(--color-white);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding-top: var(--space-6);
  font-size: 0.82rem;
  color: var(--color-text-on-dark-muted);
}

.footer-bottom nav {
  display: flex;
  gap: var(--space-5);
}

/* ---------------------------------- Cards ---------------------------------- */
.card-project {
  position: relative;
  display: block;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4 / 5;
  isolation: isolate;
}

.card-project img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--dur-slow) var(--ease-out);
}

.card-project::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10,38,32,0) 30%, rgba(8,24,20,0.92) 100%);
  z-index: 1;
}

.card-project:hover img {
  transform: scale(1.06);
}

.card-project-body {
  position: absolute;
  z-index: 2;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--space-7);
  color: var(--color-white);
}

.card-project-body .eyebrow {
  color: var(--color-gold-400);
}

.card-project-body h3 {
  color: var(--color-white);
  margin-block: var(--space-3);
}

.card-project-body p {
  color: rgba(255,255,255,0.78);
  margin-bottom: var(--space-5);
}

.card-project-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-white);
  transform: translateY(0);
  transition: gap var(--dur-base) var(--ease-out);
}

.card-project:hover .card-project-cta {
  gap: var(--space-4);
}

.card-project-cta svg {
  width: 15px;
  height: 15px;
}

.card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: var(--space-7);
  border: 1px solid var(--color-border);
  transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

.card-icon {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--color-forest-900);
  margin-bottom: var(--space-5);
}

.card-icon svg {
  width: 26px;
  height: 26px;
  color: var(--color-gold-400);
}

.card h3 {
  font-size: var(--fs-h4);
  margin-bottom: var(--space-2);
}

/* ---------------------------------- Stats ---------------------------------- */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

@media (max-width: 900px) {
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  .stat-grid { grid-template-columns: 1fr; }
}

.stat-block {
  padding-block: var(--space-6);
  border-top: 1px solid var(--color-border-on-dark);
}

.stat-value {
  display: flex;
  align-items: baseline;
  gap: 2px;
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 1.8rem + 1.6vw, 3.4rem);
  font-weight: 800;
  color: var(--color-gold-400);
  letter-spacing: var(--tracking-tight);
}

.stat-label {
  margin-top: var(--space-2);
  font-size: 0.92rem;
  color: var(--color-text-on-dark-muted);
  max-width: 24ch;
}

/* ---------------------------------- Zone / pillar tiles ---------------------------------- */
.tile-icon {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--gradient-brand);
  flex-shrink: 0;
}

.tile-icon svg {
  width: 24px;
  height: 24px;
  color: var(--color-white);
}

/* ---------------------------------- Timeline ---------------------------------- */
.timeline {
  position: relative;
  padding-left: var(--space-8);
  border-left: 1px solid var(--color-border-on-dark);
}

.timeline-item {
  position: relative;
  padding-bottom: var(--space-9);
}

.timeline-item:last-child { padding-bottom: 0; }

.timeline-item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-8) - 5px);
  top: 4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-gold-500);
  box-shadow: 0 0 0 4px rgba(201,162,76,0.18);
}

.timeline-item .eyebrow { margin-bottom: var(--space-2); }

/* ---------------------------------- Accordion ---------------------------------- */
.accordion-item {
  border-bottom: 1px solid var(--color-border);
}

.accordion-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  padding-block: var(--space-6);
  text-align: left;
  font-family: var(--font-display);
  font-size: var(--fs-h4);
  font-weight: 700;
}

.accordion-trigger svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform var(--dur-base) var(--ease-out);
}

.accordion-item.is-open .accordion-trigger svg {
  transform: rotate(45deg);
}

.accordion-panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--dur-base) var(--ease-out);
}

.accordion-item.is-open .accordion-panel {
  grid-template-rows: 1fr;
}

.accordion-panel-inner {
  overflow: hidden;
}

.accordion-panel p {
  padding-bottom: var(--space-6);
  max-width: 68ch;
}

/* ---------------------------------- Gallery ---------------------------------- */
.gallery {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}

.gallery-item {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: zoom-in;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 1;
  transition: transform var(--dur-slow) var(--ease-out);
}

.gallery-item:hover img {
  transform: scale(1.08);
}

@media (max-width: 900px) {
  .gallery { grid-template-columns: repeat(2, 1fr); }
}

/* ---------------------------------- Forms ---------------------------------- */
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}

@media (max-width: 640px) {
  .form-row { grid-template-columns: 1fr; }
}

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}

.field label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text);
}

.field input,
.field textarea,
.field select {
  padding: var(--space-4);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-white);
  transition: border-color var(--dur-fast) var(--ease-out);
}

.field input:focus,
.field textarea:focus,
.field select:focus {
  border-color: var(--color-forest-500);
}

/* ---------------------------------- CTA banner ---------------------------------- */
.cta-banner {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  padding: var(--space-11) var(--space-9);
  text-align: center;
  isolation: isolate;
}

.cta-banner img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: -2;
}

.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(10,38,32,0.94), rgba(11,74,74,0.88));
  z-index: -1;
}

.cta-banner h2 {
  color: var(--color-white);
  max-width: 20ch;
  margin-inline: auto;
}

.cta-banner .lead {
  color: var(--color-text-on-dark-muted);
  margin-inline: auto;
  margin-top: var(--space-4);
}

.cta-banner .cluster {
  justify-content: center;
  margin-top: var(--space-7);
}

/* ---------------------------------- Back to top ---------------------------------- */
.back-to-top {
  position: fixed;
  right: var(--space-6);
  bottom: var(--space-6);
  z-index: var(--z-overlay);
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--color-forest-900);
  color: var(--color-white);
  display: grid;
  place-items: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out), visibility var(--dur-base);
  box-shadow: var(--shadow-md);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top svg {
  width: 18px;
  height: 18px;
}