/* ============================================================
   layout.css — header, navigation, search, dropdowns, theme
   toggle, footer, and the responsive (mobile) behaviour.
   ============================================================ */

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  gap: 18px;
  min-height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--fd);
  font-weight: 700;
  font-size: 1.28rem;
  color: var(--text);
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.brand:hover {
  text-decoration: none;
}
.brand-mark,
.brand-accent {
  color: var(--accent);
}

/* Hamburger */
.nav-toggle {
  display: none;
  margin-left: auto;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 40px;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  padding: 0 10px;
}
.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--text);
  border-radius: 2px;
  transition:
    transform 0.2s,
    opacity 0.2s;
}
.nav-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-collapse {
  display: flex;
  align-items: center;
  gap: 18px;
  flex: 1;
  margin-left: 10px;
}

/* Search + live results */
.nav-search {
  position: relative;
  flex: 1;
  max-width: 360px;
}
.nav-search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-soft);
  font-size: 0.95rem;
  pointer-events: none;
}
.nav-search input {
  width: 100%;
  border: 1.5px solid var(--border);
  border-radius: 999px;
  padding: 9px 16px 9px 36px;
  font: inherit;
  font-size: 0.92rem;
  background: var(--surface);
  color: var(--text);
  transition:
    border-color 0.15s,
    box-shadow 0.15s;
}
.nav-search input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.search-results {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: auto;
  width: 480px;
  max-width: 88vw;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow-lg);
  padding: 6px;
  z-index: 70;
  max-height: 360px;
  overflow-y: auto;
  animation: pop 0.16s ease;
}
.sr-title {
  font-weight: 700;
  font-size: 0.92rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.sr-ex {
  font-size: 0.8rem;
  color: var(--text-soft);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.sr-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--text);
}
.sr-item:hover {
  background: var(--accent-soft);
  text-decoration: none;
}

.sr-empty {
  padding: 14px;
  text-align: center;
  color: var(--text-soft);
  font-size: 0.88rem;
}

/* Links */
.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}
.nav-item {
  color: var(--text-soft);
  font-weight: 600;
  font-size: 0.92rem;
  padding: 8px 11px;
  border-radius: 8px;
  transition:
    background 0.15s,
    color 0.15s;
  white-space: nowrap;
}
.nav-item:hover {
  color: var(--text);
  background: rgba(15, 118, 110, 0.1);
  text-decoration: none;
}

/* Dropdowns */
.nav-dd {
  position: relative;
}
.nav-dd-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.nav-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  min-width: 212px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition:
    opacity 0.16s,
    transform 0.16s,
    visibility 0.16s;
  z-index: 60;
}
.nav-dd:hover .nav-menu,
.nav-dd:focus-within .nav-menu,
.nav-dd.open .nav-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.nav-dd:hover .nav-menu,
.nav-dd:focus-within .nav-menu,
.nav-dd.open .nav-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
/* Invisible bridge so the menu stays open while the cursor moves into it */
.nav-menu::before {
  content: "";
  position: absolute;
  top: -14px;
  left: 0;
  right: 0;
  height: 14px;
}
.nav-menu a,
.nav-menu-logout {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  text-align: left;
  padding: 9px 12px;
  border-radius: 8px;
  color: var(--text);
  font: inherit;
  font-weight: 500;
  font-size: 0.92rem;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-menu a:hover,
.nav-menu-logout:hover {
  background: var(--accent-soft);
  color: var(--accent-dark);
  text-decoration: none;
}
.nm-icon {
  width: 18px;
  text-align: center;
  color: var(--accent);
}
.nav-menu-name {
  display: block;
  padding: 6px 12px 10px;
  font-weight: 700;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  margin-bottom: 6px;
}
.nav-menu-logout {
  color: var(--danger);
}
.nav-menu-logout:hover {
  background: rgba(179, 38, 30, 0.1);
  color: var(--danger);
}
.nav-avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--grad);
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  user-select: none;
}
.theme-toggle-wrap {
  display: flex;
  align-items: center;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 0 24px;
  color: var(--text-soft);
  font-size: 0.9rem;
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  margin-top: 40px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 30px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--border);
}
.footer-col {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-col h4 {
  font-family: var(--fd);
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
  margin-bottom: 4px;
}
.footer-col a {
  color: var(--text-soft);
}
.footer-col a:hover {
  color: var(--accent);
}
.brand-footer {
  font-size: 1.2rem;
  margin-bottom: 4px;
}
.footer-brand-col .muted {
  max-width: 280px;
}
.footer-bottom {
  text-align: center;
  padding-top: 20px;
}
.footer-bottom .muted {
  font-size: 0.82rem;
  margin-top: 4px;
}

/* Scroll-to-top */
.to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: none;
  background: var(--grad);
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition:
    opacity 0.25s,
    transform 0.25s,
    visibility 0.25s;
  z-index: 80;
}
.to-top.show {
  opacity: 1;
  visibility: visible;
  transform: none;
}
.to-top:hover {
  filter: brightness(1.08);
  transform: translateY(-2px);
}

/* ===================== RESPONSIVE ===================== */
@media (max-width: 980px) {
  .nav-search {
    max-width: 220px;
  }
  .nav-item {
    padding: 8px 9px;
    font-size: 0.9rem;
  }
}
@media (max-width: 820px) {
  * {
    cursor: default;
  }
  .nav-toggle {
    display: flex;
  }
  .nav-collapse {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
    background: color-mix(in srgb, var(--surface) 95%, transparent);
    backdrop-filter: blur(20px) saturate(140%);
    -webkit-backdrop-filter: blur(20px) saturate(140%);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    padding: 18px 22px 24px;
    margin: 0;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition:
      max-height 0.25s ease,
      opacity 0.2s ease,
      visibility 0.2s;
  }
  .nav-collapse.open {
    max-height: 92vh;
    overflow-y: auto;
    opacity: 1;
    visibility: visible;
  }
  .nav-search {
    max-width: none;
    width: 100%;
  }
  .nav-links {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    margin-left: 0;
    width: 100%;
  }
  .nav-item {
    padding: 12px;
    font-size: 1rem;
    border-radius: 10px;
  }
  .nav-item:hover {
    background: var(--accent-soft);
  }
  .nav-dd {
    width: 100%;
  }
  .nav-dd-btn {
    width: 100%;
  }
  .nav-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    padding: 4px 0 0 8px;
    min-width: 0;
    display: none;
    background: transparent !important;
  }
  .nav-dd.open .nav-menu {
    display: block;
  }
  .nav-account .nav-avatar {
    display: none;
  }
  .nav-account .nav-menu {
    display: block;
    padding-left: 0;
  }
  .nav-menu-name {
    padding-left: 12px;
  }
  .nav-contribute {
    width: 88%;
  }
  .theme-toggle-wrap {
    position: absolute;
    bottom: 20px;
    right: 23px;
  }
}
@media (max-width: 760px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 22px;
  }
  .footer-brand-col {
    grid-column: 1 / -1;
  }
}
@media (max-width: 600px) {
  .container {
    padding: 0 16px;
  }
  .brand {
    font-size: 1.15rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
}