/* ===== Layout: Header, Footer, Grid ===== */

/* --- Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--clr-bg);
  border-bottom: 1px solid var(--clr-border);
}

.header-status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background: linear-gradient(90deg, #111, var(--clr-bg-elevated), #111);
  border-bottom: 1px solid var(--clr-border);
}

.header-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  transition: opacity var(--transition-fast);
  &:hover { opacity: 0.85; }
}

.header-radiation-icon {
  color: var(--clr-accent);
  filter: drop-shadow(0 0 6px var(--clr-accent-glow));
  transition: filter var(--transition-base);
  .header-logo:hover & { filter: drop-shadow(0 0 12px var(--clr-accent-glow)); }
}

.header-title {
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: var(--tracking-wide);
  color: var(--clr-accent);
  text-shadow: 0 0 15px var(--clr-accent-glow), 0 0 40px color-mix(in srgb, var(--clr-accent) 10%, transparent);
}

.header-subtitle {
  font-size: var(--text-xs);
  color: var(--clr-text-muted);
  letter-spacing: 0.2em;
}

.header-status-right {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--text-xs);
  color: var(--clr-text-dim);
}

.status-terminal-text {
  letter-spacing: 0.05em;
}

.status-online-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--clr-success);
}

.status-version {
  color: var(--clr-text-dim);
}

/* --- Navigation --- */
.header-nav {
  display: flex;
  align-items: center;
  gap: 0;
  padding: 0 var(--space-4);
  background: color-mix(in srgb, var(--clr-bg) 90%, transparent);
  backdrop-filter: blur(8px);
  height: 44px;
  overflow-x: auto;
}

.nav-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--clr-text-muted);
  letter-spacing: 0.05em;
  transition: color var(--transition-fast), background var(--transition-fast);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  flex-shrink: 0;

  &:hover { color: var(--clr-text); background: var(--clr-surface); }
  &:focus-visible { outline: 2px solid var(--clr-accent); outline-offset: 2px; }

  &[aria-current="page"],
  &.active {
    color: var(--clr-accent);
  }
}

.nav-divider {
  color: var(--clr-border-light);
  font-size: var(--text-sm);
  margin: 0 var(--space-1);
  flex-shrink: 0;
}

.nav-admin {
  margin-left: auto;
  color: var(--clr-text-dim);
  border: 1px solid var(--clr-border);

  &:hover { border-color: var(--clr-accent); color: var(--clr-accent); }
}

/* --- Main 3-column layout --- */
.main-layout {
  display: grid;
  grid-template-columns: minmax(0, 250px) 700px minmax(0, 250px);
  justify-content: center;
  gap: var(--space-4);
  width: 100%;
  padding: var(--space-4);
  flex: 1;
  min-height: 0;
}

.sidebar-left {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  position: sticky;
  top: calc(var(--header-height) + var(--space-4));
  height: fit-content;
  max-height: calc(100vh - var(--header-height) - var(--space-8));
  overflow-y: auto;
  order: 1;
}

.main-content {
  min-width: 0;
  overflow-x: visible;
  order: 2;
  flex-basis: 0;
  flex-grow: 1;
}

.sidebar-right {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  position: sticky;
  top: calc(var(--header-height) + var(--space-4));
  height: fit-content;
  max-height: calc(100vh - var(--header-height) - var(--space-8));
  overflow-y: auto;
  order: 3;
}

/* --- Footer --- */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--clr-border);
  background: var(--clr-bg-elevated);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1.2fr;
  gap: var(--space-8);
  max-width: 1280px;
  margin: 0 auto;
  padding: var(--space-6) var(--space-4);
}

.footer-nav-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--clr-text-muted);
  cursor: pointer;
  transition: color var(--transition-fast);
  text-decoration: none;
  padding: var(--space-1) 0;

  &:hover, &.active { color: var(--clr-accent); }

  &.active::after { content: '[активно]'; font-size: var(--text-xs); color: var(--clr-accent); margin-left: var(--space-2); }
}

.footer-heading {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--clr-accent);
  margin-bottom: var(--space-2);
}

.footer-text {
  font-size: var(--text-xs);
  color: var(--clr-text-muted);
  line-height: var(--leading-relaxed);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1280px;
  margin: 0 auto;
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--clr-border);
  font-size: var(--text-xs);
  color: var(--clr-text-dim);
}

/* --- Scroll to top --- */
.scroll-to-top {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--clr-bg-elevated);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  color: var(--clr-text-muted);
  opacity: 0;
  visibility: hidden;
  transform: scale(0.8);
  transition: all var(--transition-base);

  &.is-visible {
    opacity: 1;
    visibility: visible;
    transform: scale(1);
  }

  &:hover { border-color: var(--clr-accent); color: var(--clr-accent); }
  &:focus-visible { outline: 2px solid var(--clr-accent); outline-offset: 2px; }
}

/* --- Telegram Card --- */
.telegram-card {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--clr-bg-panel);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  color: var(--clr-text-muted);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: all var(--transition-fast);

  &:hover { border-color: #229ed9; color: #229ed9; background: color-mix(in srgb, #229ed9 8%, var(--clr-bg-panel)); }
}

/* --- Responsive --- */
@media (max-width: 1023px) {
  .main-layout {
    grid-template-columns: 1fr;
    padding: var(--space-3);
    max-width: 100%;
    overflow: visible;
  }

  .sidebar-left, .sidebar-right {
    position: static;
    max-height: none;
    order: unset;
  }

  .sidebar-left { order: 2; }
  .main-content  { order: 1; min-width: 0; overflow-x: visible; }
  .sidebar-right { order: 3; }

  .header-status-right {
    display: none;
  }
}

@media (max-width: 768px) {
  .main-layout {
    padding: var(--space-2);
    gap: var(--space-2);
  }
  .page-title { font-size: var(--text-lg); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-about { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .header-nav { padding: 0 var(--space-2); }
  .nav-item { padding: var(--space-2); font-size: 0.625rem; letter-spacing: 0.02em; }
  .nav-divider { margin: 0 2px; }
  .header-title { font-size: var(--text-md); }
  .header-subtitle { display: none; }

  .footer-grid { grid-template-columns: 1fr; gap: var(--space-5); }
  .footer-bottom { flex-direction: column; gap: var(--space-1); text-align: center; }
}