/* ============================================================
   claude_header.css — Header, navigation, mobile drawer
   ============================================================ */

/* --- Sticky Header --- */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(14, 14, 16, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--c-line);
}

header .headerInner {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 48px;
}

/* Logo */
header .logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--c-ink);
  transition: opacity var(--c-duration) var(--c-ease);
}

header .logo:hover {
  opacity: 0.8;
}

header .logo img {
  height: 26px;
  display: block;
  filter: invert(1) brightness(1.1);
}

/* Mobile toggle */
header .mobileMenuWrap {
  display: none;
  width: 100%;
  padding-left: 40px;
  justify-content: flex-end;
}

header .menuBtn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  font-size: 1rem;
  color: var(--c-ink);
  text-decoration: none;
  border-radius: var(--c-radius-sm);
  border: 1px solid var(--c-line-strong);
  background: rgba(255, 255, 255, 0.04);
  transition: background var(--c-duration) var(--c-ease), border-color var(--c-duration) var(--c-ease);
}

header .menuBtn:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
}

/* Main Nav */
header .mainNav {
  display: flex;
  gap: 8px;
  align-items: center;
  justify-content: center;
}

header .mainNav > div {
  position: relative;
  display: flex;
  align-items: center;
}

/* Hover bridge */
header .mainNav > div::after {
  content: "";
  position: absolute;
  left: -8px;
  right: -8px;
  top: 100%;
  height: 24px;
  pointer-events: none;
}

header .mainNav > div > a {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--c-ink-secondary);
  text-decoration: none;
  border-radius: var(--c-radius-xs);
  position: relative;
  transition: color var(--c-duration) var(--c-ease), background var(--c-duration) var(--c-ease);
}

header .mainNav > div > a:hover,
header .mainNav > div:hover > a {
  color: var(--c-ink);
  background: rgba(255, 255, 255, 0.05);
}

/* Underline indicator */
header .mainNav > div > a::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 2px;
  height: 2px;
  background: var(--c-accent);
  border-radius: 2px;
  transform: scaleX(0);
  transition: transform 0.25s var(--c-ease);
}

header .mainNav > div:hover > a::after,
header .mainNav > div:focus-within > a::after {
  transform: scaleX(1);
}

/* --- Submenu Dropdown --- */
header .mainNav > div > nav {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  min-width: 200px;
  padding: 8px;
  background: var(--c-bg-card);
  border: 1px solid var(--c-line-strong);
  border-radius: var(--c-radius);
  box-shadow: var(--c-shadow-lg);
  z-index: 200;
  display: grid;
  gap: 2px;

  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.2s var(--c-ease), visibility 0.2s var(--c-ease), transform 0.2s var(--c-ease);
}

header .mainNav > div > nav::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -16px;
  height: 16px;
}

header .mainNav > div > nav > a {
  display: block;
  padding: 10px 14px;
  font-size: 0.88rem;
  font-weight: 400;
  color: var(--c-ink-secondary);
  text-decoration: none;
  border-radius: var(--c-radius-xs);
  transition: background var(--c-duration) var(--c-ease), color var(--c-duration) var(--c-ease);
}

header .mainNav > div > nav > a:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--c-ink);
}

header .mainNav > div:hover > nav,
header .mainNav > div:focus-within > nav {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

/* --- Drawer (Mobile Side Panel) --- */
.drawerPanel {
  position: fixed;
  inset: 0 auto 0 0;
  width: min(86vw, 360px);
  background: var(--c-bg-elevated);
  border-right: 1px solid var(--c-line-strong);
  box-shadow: var(--c-shadow-lg);
  transform: translateX(-100%);
  visibility: hidden;
  z-index: 6000;
  display: flex;
  flex-direction: column;
  transition: transform 0.35s var(--c-ease), visibility 0.35s;
  overflow-y: auto;
}

.drawerPanel .drawerHead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  border-bottom: 1px solid var(--c-line);
  position: sticky;
  top: 0;
  background: var(--c-bg-elevated);
  z-index: 10;
}

.drawerPanel .drawerHead .logo img {
  height: 24px;
  filter: invert(1) brightness(1.1);
}

.drawerPanel .drawerHead .closeBtn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  text-decoration: none;
  transition: background var(--c-duration) var(--c-ease);
}

.drawerPanel .drawerHead .closeBtn .material-icons {
  font-size: 20px;
  color: var(--c-ink-secondary);
}

.drawerPanel .drawerHead .closeBtn:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* Drawer Nav */
.drawerPanel .drawerNav,
.drawerPanel > .mainNav {
  display: grid;
  gap: 0;
  padding: 12px 0;
}

.drawerPanel .drawerNav > div,
.drawerPanel > .mainNav > div {
  display: block;
  border-bottom: 1px solid var(--c-line);
}

.drawerPanel .drawerNav > div > a,
.drawerPanel > .mainNav > div > a {
  display: block;
  padding: 16px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--c-ink);
  text-decoration: none;
  transition: background var(--c-duration) var(--c-ease);
}

.drawerPanel .drawerNav > div > a::after {
  display: none;
}

.drawerPanel .drawerNav > div > a:hover,
.drawerPanel > .mainNav > div > a:hover {
  background: rgba(255, 255, 255, 0.04);
}

/* Drawer subnav */
.drawerPanel .drawerNav > div > nav,
.drawerPanel > .mainNav > div > nav {
  position: static;
  transform: none;
  min-width: 0;
  padding: 0 0 8px 0;
  border: 0;
  box-shadow: none;
  border-radius: 0;
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  display: grid;
  gap: 0;
  background: transparent;
}

.drawerPanel .drawerNav > div > nav a,
.drawerPanel > .mainNav > div > nav > a {
  display: block;
  padding: 10px 24px 10px 40px;
  font-size: 0.88rem;
  font-weight: 400;
  color: var(--c-ink-tertiary);
  text-decoration: none;
  border-radius: 0;
  transition: color var(--c-duration) var(--c-ease), background var(--c-duration) var(--c-ease);
}

.drawerPanel .drawerNav > div > nav a:hover,
.drawerPanel > .mainNav > div > nav > a:hover {
  color: var(--c-ink);
  background: rgba(255, 255, 255, 0.04);
}

/* Drawer overlay */
.drawerOverlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  visibility: hidden;
  z-index: 5500;
  transition: opacity 0.35s var(--c-ease), visibility 0.35s;
}

/* --- Responsive --- */
@media (max-width: 767px) {
  header .headerInner {
    height: 56px;
    padding: 0 16px;
    gap: 0;
  }

  header .mobileMenuWrap {
    display: flex;
  }

  header .menuBtn {
    display: inline-flex;
  }

  header .logo {
    justify-self: start;
  }

  header .mainNav {
    display: none;
  }
}