/* ==========================================================================
   TUPPA MA — header.css
   Sidebar fissa a sinistra su desktop; header superiore compatto su mobile.
   Il markup è unico e viene iniettato da layout.js su tutte le pagine.
   ========================================================================== */

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: 260px;
  height: 100vh;
  padding: 56px 40px;
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 56px;
  background: var(--bg);
  transition: background 0.25s ease, border-color 0.25s ease;
}

.sidebar__logo {
  display: block;
  border-bottom: none;
  color: var(--fg);
}

.sidebar__logo svg,
.sidebar__logo img {
  width: 100%;
  max-width: 150px;
  height: auto;
  transition: filter 0.25s ease;
}

/* Il file logo.svg usa un fill bianco fisso: sul tema chiaro lo invertiamo
   via filtro, cosi resta leggibile senza toccare l'SVG originale. */
:root[data-theme="light"] .sidebar__logo img {
  filter: invert(1);
}

.sidebar__nav {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.sidebar__link {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--fg-muted);
  border-bottom: none;
  width: fit-content;
  transition: color 0.15s ease;
}

.sidebar__link:hover,
.sidebar__link:focus-visible {
  color: var(--fg);
}

.sidebar__link.is-active {
  color: var(--fg);
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 2px;
}

/* Pulsante inverti colori, in fondo alla sidebar */
.theme-toggle {
  margin-top: auto;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg-muted);
  border: 1px solid var(--line);
  padding: 10px 14px;
  width: fit-content;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  color: var(--fg);
  border-color: var(--line-strong);
}

/* --------------------------------------------------------------------------
   Mobile: header superiore compatto
   -------------------------------------------------------------------------- */

@media (max-width: 860px) {
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    height: auto;
    padding: 14px 20px;
    border-right: none;
    border-bottom: 1px solid var(--line);
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    z-index: 100;
  }

  .sidebar__logo {
    flex-shrink: 0;
    width: 44px;
  }

  .sidebar__nav {
    flex-direction: row;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
  }

  .sidebar__link {
    font-size: 11px;
    letter-spacing: 0.15em;
  }

  .theme-toggle {
    margin-top: 0;
    padding: 6px 10px;
    font-size: 10px;
  }
}

@media (max-width: 480px) {
  .theme-toggle .theme-toggle__label {
    display: none; /* su schermi molto stretti resta solo il simbolo */
  }
}