/* ============================================
   COMPONENTS — Reusable UI elements
   ============================================ */

/* ── Header / Navigation ── */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  padding: var(--sp-4) var(--page-mx);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background var(--dur-fast) var(--ease),
              backdrop-filter var(--dur-fast) var(--ease);
}

.header.scrolled {
  background: rgba(239, 238, 234, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.header-logo {
  font-family: var(--f-zh), var(--f-sans);
  font-size: var(--fs-base);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-wide);
  transition: opacity var(--dur-fast) var(--ease);
}

.header-logo:hover { opacity: 1; }

.header-logo .site-logo {
  width: 32px;
  height: 32px;
  color: var(--c-text);
  vertical-align: middle;
  transition: transform var(--dur-fast) var(--ease);
}

.header-logo:hover .site-logo {
  transform: scale(1.05);
}

.header-center {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  text-transform: uppercase;
  letter-spacing: var(--ls-widest);
  color: var(--c-text-muted);
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}

.header-lang {
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-wide);
  cursor: pointer;
  opacity: 0.5;
  transition: opacity var(--dur-fast) var(--ease);
}

.header-lang.active,
.header-lang:hover { opacity: 1; }

.header-lang-divider {
  font-size: var(--fs-xs);
  color: var(--c-text-muted);
  user-select: none;
}

.header-menu-btn {
  font-size: var(--fs-xs);
  font-weight: var(--fw-bold);
  text-transform: uppercase;
  letter-spacing: var(--ls-widest);
  cursor: pointer;
  position: relative;
  padding: var(--sp-2) 0;
}

.header-menu-btn::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--c-text);
  transition: width var(--dur-fast) var(--ease);
}

.header-menu-btn:hover::after { width: 100%; }

/* ── Full-screen Menu ── */
.menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 100vh;
  height: var(--menu-vh, 100vh);
  z-index: var(--z-overlay);
  background: var(--c-bg-dark);
  display: flex;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-normal) var(--ease),
              visibility var(--dur-normal) var(--ease);
}

.menu-overlay.open {
  opacity: 1;
  visibility: visible;
}

.menu-overlay-inner {
  width: 100%;
  height: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  padding: var(--sp-4) var(--page-mx);
}

.menu-brand {
  display: flex;
  flex-direction: column;
  justify-content: center;
  color: var(--c-text-light);
}

.menu-brand-name {
  font-size: var(--fs-lg);
  font-weight: var(--fw-regular);
}

.menu-logo-mark {
  display: flex;
  align-items: center;
  justify-content: center;
}

.menu-logo-mark svg {
  width: 220px;
  height: 220px;
}

.menu-nav {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--sp-3);
}

.menu-nav-link {
  font-size: var(--fs-mega);
  font-weight: var(--fw-light);
  color: var(--c-text-light);
  line-height: var(--lh-tight);
  transition: opacity var(--dur-fast) var(--ease),
              transform var(--dur-fast) var(--ease);
  transform: translateX(0);
}

.menu-nav-link:hover {
  opacity: 1;
  transform: translateX(12px);
}

.menu-close {
  position: absolute;
  top: var(--sp-4);
  right: var(--page-mx);
  font-size: var(--fs-xs);
  font-weight: var(--fw-bold);
  text-transform: uppercase;
  letter-spacing: var(--ls-widest);
  color: var(--c-text-light);
  cursor: pointer;
}

.menu-footer {
  position: absolute;
  bottom: var(--sp-4);
  left: 0;
  right: 0;
  padding: 0 var(--page-mx);
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
}

.menu-social {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}

.menu-social a {
  font-size: var(--fs-xs);
  font-weight: var(--fw-bold);
  text-transform: uppercase;
  letter-spacing: var(--ls-wider);
  color: var(--c-text-light);
}

.menu-copyright {
  font-size: var(--fs-xs);
  color: var(--c-text-subtle);
}

/* ── Project Card (Works list) ── */
.project-item {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--sp-7);
  padding: var(--sp-8) 0;
  border-bottom: var(--border);
  cursor: pointer;
}

.project-item:first-child {
  padding-top: var(--sp-6);
}

.project-info {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: var(--sp-3);
}

.project-client {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-wide);
}

.project-title {
  font-size: var(--fs-xl);
  font-weight: var(--fw-light);
  line-height: var(--lh-snug);
}

.project-code {
  font-family: var(--f-mono);
  font-size: var(--fs-xs);
  color: var(--c-text-muted);
  letter-spacing: var(--ls-wide);
}

.project-summary {
  font-size: var(--fs-sm);
  line-height: var(--lh-relaxed);
  color: var(--c-text-muted);
  max-width: 300px;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-1);
}

.project-images {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--grid-gap);
}

.project-images .img-wrap {
  aspect-ratio: 4/3;
}

/* ── Tags ── */
.tag {
  display: inline-flex;
  align-items: center;
  padding: var(--sp-1) var(--sp-2);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-wide);
  border: 1px solid var(--c-border);
  transition: all var(--dur-fast) var(--ease);
  cursor: pointer;
}

.tag:hover,
.tag.active {
  background: var(--c-text);
  color: var(--c-bg);
  border-color: var(--c-text);
}

/* ── Category Filter ── */
.filter-bar {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.filter-categories {
  display: flex;
  gap: var(--sp-3);
}

.filter-cat {
  font-size: var(--fs-xs);
  font-weight: var(--fw-bold);
  text-transform: uppercase;
  letter-spacing: var(--ls-wider);
  color: var(--c-text-muted);
  cursor: pointer;
  transition: color var(--dur-fast) var(--ease);
  position: relative;
  padding-bottom: 2px;
}

.filter-cat.active,
.filter-cat:hover {
  color: var(--c-text);
}

.filter-cat.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--c-text);
}

.filter-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-1);
}

/* ── Footer ── */
.footer {
  padding: var(--sp-7) var(--page-mx);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: var(--border);
}

.footer-links {
  display: flex;
  gap: var(--sp-5);
}

.footer-links a {
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  text-transform: uppercase;
  letter-spacing: var(--ls-wider);
}

.footer-copy {
  font-size: var(--fs-xs);
  color: var(--c-text-muted);
}

.footer-social {
  display: flex;
  gap: var(--sp-4);
}

.footer-social a {
  font-size: var(--fs-xs);
  font-weight: var(--fw-bold);
  text-transform: uppercase;
  letter-spacing: var(--ls-wider);
}

/* ── Link with arrow ── */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-wide);
  transition: gap var(--dur-fast) var(--ease);
}

.link-arrow:hover {
  opacity: 1;
  gap: var(--sp-3);
}

.link-arrow .arrow {
  transition: transform var(--dur-fast) var(--ease);
}

.link-arrow:hover .arrow {
  transform: translateX(4px);
}

/* ── Page Header (for inner pages) ── */
.page-header {
  padding-top: calc(var(--sp-9) + 60px);
  padding-bottom: var(--sp-7);
}

.page-title {
  font-size: var(--fs-hero);
  font-weight: var(--fw-light);
  letter-spacing: var(--ls-tight);
  line-height: var(--lh-tight);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .header-center { display: none; }

  /* Menu: flex-column layout so footer never overlaps nav */
  .menu-overlay {
    flex-direction: column;
  }

  .menu-overlay-inner {
    grid-template-columns: 1fr;
    padding-top: 72px;  /* space below close button */
    height: auto;
    flex: 1;
    min-height: 0;
    overflow-y: auto;
  }

  /* Footer sits in normal flow at the bottom — no absolute positioning */
  .menu-footer {
    position: static;
    left: auto;
    right: auto;
    bottom: auto;
    padding: var(--sp-4) var(--page-mx);
    flex-shrink: 0;
  }

  .menu-brand { display: none; }
  .menu-images { display: none; }

  .menu-nav-link {
    font-size: var(--fs-2xl);
  }

  /* Footer links: wrap to multiple rows on mobile */
  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--sp-1) var(--sp-3);
  }

  .project-item {
    grid-template-columns: 1fr;
    gap: var(--sp-4);
  }

  .project-title {
    font-size: var(--fs-lg);
  }

  .page-title {
    font-size: var(--fs-2xl);
  }
  
  .heading-hero {
    font-size: var(--fs-2xl);
  }
  
  .heading-display {
    font-size: var(--fs-xl);
  }
  
  .footer {
    flex-direction: column;
    gap: var(--sp-4);
    text-align: center;
  }
}