/* ==========================================================================
   Global Sidebar & Responsive Navigation (nav.css)
   Reuses global variables from styles.css: --bg, --fg, --muted, --line, --pad, --radius
   ========================================================================== */

:root {
  --sidebar-width: 220px;
  --mobile-nav-height: 60px;
}

/* --- Page Layout Offset for Fixed Sidebar --- */
@media (min-width: 900px) {
  body {
    padding-left: var(--sidebar-width);
  }

  main,
  .project-page {
    padding-top: calc(var(--pad) * 1.5);
  }
}

@media (max-width: 899px) {
  body {
    padding-left: 0;
    overflow-x: hidden;
  }

  main,
  .project-page {
    padding-top: calc(var(--mobile-nav-height) + 28px);
  }
}

/* Anchor scroll offset so fixed navigation never covers targets */
#statement,
#cv,
#work,
#about,
#contact,
#email,
#socials {
  scroll-margin-top: 32px;
}

@media (max-width: 899px) {
  #statement,
  #cv,
  #work,
  #about,
  #contact,
  #email,
  #socials {
    scroll-margin-top: calc(var(--mobile-nav-height) + 20px);
  }
}

/* --- Sidebar Container (Desktop Fixed Left) --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  z-index: 100;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: stretch;
  padding: 40px 28px;
  background: var(--bg);
  border-right: 1px solid var(--line);
  border-radius: 0;
  inset: 0 auto 0 0;
  backdrop-filter: none;
}

.nav-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 44px;
}

.nav-brand-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.nav .brand {
  color: var(--fg);
  text-decoration: none;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.08em;
  line-height: 1.2;
  transition: opacity 0.2s ease;
}

.nav .brand span {
  opacity: 0.65;
  font-weight: 500;
}

.nav .brand:hover {
  opacity: 0.85;
}

.koname {
  position: static;
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.04em;
  line-height: 1.2;
  pointer-events: auto;
}

/* --- Primary Navigation Links --- */
.nav-links {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
  width: 100%;
}

.nav .nav-links a {
  margin-left: 0;
}

.nav-link,
.dropbtn {
  display: inline-block;
  width: 100%;
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1.4;
  padding: 2px 0;
  opacity: 1;
  transition: color 0.2s ease, opacity 0.2s ease;
}

.nav-link:hover,
.nav-link:focus-visible,
.dropbtn:hover,
.dropbtn:focus-visible,
.nav-link.active,
.dropbtn.active {
  color: var(--fg);
  opacity: 1;
}

.nav-link:focus-visible,
.dropbtn:focus-visible,
.nav-sublink:focus-visible {
  outline: 1px solid var(--fg);
  outline-offset: 4px;
  border-radius: 2px;
}

/* --- Nested Work Navigation --- */
.nav-group.dropdown {
  position: relative;
  display: flex;
  flex-direction: column;
  width: 100%;
}

.nav-sub.dropdown-content {
  position: static;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  width: 100%;
  background: transparent;
  backdrop-filter: none;
  border: none;
  border-left: 1px solid var(--line);
  border-radius: 0;
  padding: 0 0 0 14px;
  margin-left: 2px;
  margin-top: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  pointer-events: none;
  transition:
    max-height 0.28s cubic-bezier(0.22, 1, 0.36, 1),
    opacity 0.22s ease,
    margin-top 0.28s cubic-bezier(0.22, 1, 0.36, 1);
}

.nav-group.dropdown.open .nav-sub.dropdown-content,
.nav-group.dropdown.active-group .nav-sub.dropdown-content,
.nav-group.dropdown:focus-within .nav-sub.dropdown-content {
  max-height: 100px;
  opacity: 1;
  margin-top: 8px;
  pointer-events: auto;
}

.nav-sub.dropdown-content a.nav-sublink {
  display: block;
  padding: 2px 0;
  font-size: 13px;
  font-weight: 400;
  color: var(--muted);
  text-decoration: none;
  opacity: 0.85;
  background: transparent;
  transition: color 0.2s ease, opacity 0.2s ease;
}

.nav-sub.dropdown-content a.nav-sublink:hover,
.nav-sub.dropdown-content a.nav-sublink:focus-visible,
.nav-sub.dropdown-content a.nav-sublink.active {
  color: var(--fg);
  opacity: 1;
  background: transparent;
}

/* --- Mobile Menu Toggle Button (Hidden on Desktop) --- */
.nav-toggle {
  display: none;
  appearance: none;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--fg);
  width: 38px;
  height: 34px;
  padding: 0;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  transition: border-color 0.2s ease;
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: var(--muted);
}

.nav-toggle-bar {
  display: block;
  width: 16px;
  height: 1.5px;
  background: var(--fg);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav.menu-open .nav-toggle-bar:first-child {
  transform: translateY(3.25px) rotate(45deg);
}

.nav.menu-open .nav-toggle-bar:last-child {
  transform: translateY(-3.25px) rotate(-45deg);
}

/* --- Mobile Compact Top Navigation (< 900px) --- */
@media (max-width: 899px) {
  .nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: auto;
    width: 100%;
    height: auto;
    padding: 0;
    background: color-mix(in oklab, var(--bg), transparent 12%);
    backdrop-filter: blur(10px);
    border-right: none;
    border-bottom: 1px solid var(--line);
  }

  .nav-header {
    height: var(--mobile-nav-height);
    padding: 0 var(--pad);
    margin-bottom: 0;
    align-items: center;
  }

  .nav-brand-group {
    flex-direction: row;
    align-items: baseline;
    gap: 10px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    gap: 12px;
    padding: 16px var(--pad) 24px;
    border-top: 1px solid var(--line);
    background: var(--bg);
  }

  .nav.menu-open .nav-links {
    display: flex;
  }

  .nav-link,
  .dropbtn {
    font-size: 15px;
    padding: 4px 0;
  }

  /* Always show Fine Art & Creative Coding inside mobile menu for direct touch access */
  .nav-sub.dropdown-content {
    max-height: none;
    opacity: 1;
    margin-top: 6px;
    pointer-events: auto;
    padding-left: 14px;
    gap: 8px;
  }

  .nav-sub.dropdown-content a.nav-sublink {
    font-size: 14px;
    padding: 3px 0;
  }
}

/* --- About Page Statement & CV Separation --- */
.about-page .statement {
  max-width: 860px;
  margin: 0 auto calc(var(--pad) * 2);
}

.about-page .cv {
  border-top: 1px solid var(--line);
  padding-top: calc(var(--pad) * 2);
}