/* ═══════════════════════════════════════════════════════════════
   LoveCats — Header & Navigation
   ═══════════════════════════════════════════════════════════════ */

/* ── Site Header ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: color-mix(in srgb, var(--c-bg) 82%, transparent);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--c-border);
  transition:
    background var(--dur-slow) var(--ease-out),
    border-color var(--dur-slow) var(--ease-out),
    box-shadow var(--dur-base) var(--ease-out);
}

.site-header.is-scrolled {
  border-bottom-color: var(--c-border-strong);
  box-shadow: 0 4px 32px rgba(0, 0, 0, 0.35);
}

/* ── Header Inner (flex row) ── */
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: var(--s-6);
  padding-inline: clamp(var(--s-5), 5vw, var(--s-12));
}

/* ── Logo ── */
.logo {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  flex-shrink: 0;
  text-decoration: none;
  transition: opacity var(--dur-fast);
}
.logo:hover { opacity: 0.82; }

.logo__icon { height: 3.0rem;  width: auto; }
.logo__text { height: 5.0rem;  width: auto; }

/* ── Desktop Nav ── */
.site-nav {
  display: flex;
  align-items: center;
  flex: 1;
  justify-content: center;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(var(--s-3), 2.5vw, var(--s-8));
  list-style: none;
}

.site-nav__link {
  position: relative;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--c-text-2);
  padding: var(--s-1-5) var(--s-2);
  letter-spacing: 0.01em;
  white-space: nowrap;
  transition: color var(--dur-base);
}

.site-nav__link::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 50%;
  width: 0;
  height: 2px;
  border-radius: var(--r-full);
  background: var(--c-primary);
  transform: translateX(-50%);
  transition: width var(--dur-base) var(--ease-out);
}

.site-nav__link:hover { color: var(--c-text-1); }
.site-nav__link:hover::after { width: 100%; }

.site-nav__link.is-active {
  color: var(--c-primary);
  font-weight: 600;
}
.site-nav__link.is-active::after { width: 100%; }

/* ── Header Actions ── */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--s-2-5);
  flex-shrink: 0;
}

/* ── Theme Toggle ── */
.btn-theme {
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--r-full);
  background: var(--c-surface-raised);
  border: 1px solid var(--c-border-strong);
  cursor: pointer;
  transition:
    background var(--dur-base) var(--ease-out),
    border-color var(--dur-base),
    transform var(--dur-fast) var(--ease-spring);
}
.btn-theme:hover {
  background: var(--c-surface-high);
  border-color: var(--c-primary);
  transform: rotate(18deg) scale(1.1);
}

.btn-theme svg {
  width: 1rem;
  height: 1rem;
  stroke: var(--c-text-2);
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: stroke var(--dur-base);
}
.btn-theme:hover svg { stroke: var(--c-primary); }

/* Show sun icon in dark mode (to switch to light), moon in light mode */
[data-theme="dark"]  .icon-moon { display: none; }
[data-theme="light"] .icon-sun  { display: none; }
[data-theme="dark"]  .icon-sun  { display: block; }
[data-theme="light"] .icon-moon { display: block; }

/* ── Hamburger Button (mobile) ── */
.btn-menu {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 2.25rem;
  height: 2.25rem;
  padding: 7px;
  border-radius: var(--r-sm);
  background: var(--c-surface-raised);
  border: 1px solid var(--c-border-strong);
  cursor: pointer;
  transition: background var(--dur-base), border-color var(--dur-base);
}
.btn-menu:hover {
  background: var(--c-surface-high);
  border-color: var(--c-primary);
}

.btn-menu__bar {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--c-text-1);
  transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-base);
}

/* Animate to X when drawer is open */
.btn-menu[aria-expanded="true"] .btn-menu__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.btn-menu[aria-expanded="true"] .btn-menu__bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.btn-menu[aria-expanded="true"] .btn-menu__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Drawer Close Button ── */
.btn-drawer-close {
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  margin-left: auto;
  border-radius: var(--r-full);
  background: var(--c-surface-raised);
  border: 1px solid var(--c-border-strong);
  cursor: pointer;
  transition: background var(--dur-base), transform var(--dur-fast);
  flex-shrink: 0;
}
.btn-drawer-close:hover {
  background: var(--c-error-dim);
  border-color: var(--c-error);
  transform: rotate(90deg);
}
.btn-drawer-close svg {
  width: 1rem;
  height: 1rem;
  stroke: var(--c-text-2);
}

/* ── Mobile Drawer ── */
.mobile-drawer {
  display: none;
  position: fixed;
  inset: var(--header-h) 0 0 0;
  background: var(--c-bg);
  border-top: 1px solid var(--c-border);
  flex-direction: column;
  z-index: 99;
  overflow-y: auto;
}

@keyframes drawerIn {
  from { opacity: 0; transform: translateY(-10px); }
  to   { opacity: 1; transform: none; }
}

.mobile-drawer.is-open {
  display: flex;
  animation: drawerIn var(--dur-base) var(--ease-out) both;
}

.drawer-inner {
  display: flex;
  flex-direction: column;
  padding: var(--s-5) clamp(var(--s-5), 8vw, var(--s-12));
  gap: var(--s-1);
}

/* In mobile drawer, use block links */
.mobile-drawer .site-nav__list {
  flex-direction: column;
  align-items: stretch;
  gap: var(--s-1);
  margin-top: var(--s-3);
}

.mobile-drawer .site-nav__link {
  display: block;
  padding: var(--s-4) var(--s-5);
  border-radius: var(--r-md);
  font-size: var(--text-md);
  font-weight: 600;
  background: transparent;
  transition: background var(--dur-base), color var(--dur-base), padding-left var(--dur-base);
}

.mobile-drawer .site-nav__link::after { display: none; }

.mobile-drawer .site-nav__link:hover {
  background: var(--c-surface-raised);
  color: var(--c-primary);
  padding-left: var(--s-7);
}

.mobile-drawer .site-nav__link.is-active {
  background: var(--c-primary-dim);
  color: var(--c-primary);
}

/* ── Responsive ── */
@media (max-width: 820px) {
  .site-nav  { display: none; }
  .btn-menu  { display: flex; }
}

@media (max-width: 480px) {
  .header-inner { padding-inline: var(--s-4); }
  .logo__text   { height: 1.35rem; }
  .logo__icon   { height: 2.4rem; }
}