/* ============================================================
   SIDEBAR NAVIGATION (right side, vertical)
============================================================ */
.sidebar-nav {
  position: fixed;
  right: 0;
  top: 0;
  height: 100vh;    /* fallback */
  height: 100dvh;   /* accounts for the browser UI on mobile/tablet */
  display: flex;
  flex-direction: row;
  align-items: stretch;
  z-index: 100;
  pointer-events: none;
}

/* Logo box */
.sidebar-logo {
  position: fixed;
  top: 1.25rem;
  right: 1.25rem;
  z-index: 200;
  background: var(--white);
  border-radius: 16px;
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(0,0,0,0.12);
  pointer-events: auto;
  text-decoration: none;
  transition: transform var(--transition), box-shadow var(--transition);
}
.sidebar-logo:hover,
.sidebar-logo:focus {
  transform: scale(1.07);
  box-shadow: 0 8px 30px rgba(0,0,0,0.18);
  outline: 3px solid var(--teal);
}
.sidebar-logo img { width: 36px; height: 36px; }

/* Three coloured stripes */
.sidebar-strip {
  width: var(--sidebar-w);
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  padding-bottom: 1.5rem;
  pointer-events: auto;
  position: relative;
}
.sidebar-strip--mauve  { background: var(--mauve); }
.sidebar-strip--orange { background: var(--orange); }
.sidebar-strip--apricot   { background: var(--apricot); }
.sidebar-strip--darkteal   { background: var(--darkteal); }
.sidebar-strip--teal   { background: var(--teal); }

.sidebar-link {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  transform: rotate(180deg);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.6);
  text-decoration: none;
  transition: color var(--transition);
  padding: 0.5rem 0;
}
.sidebar-link:hover,
.sidebar-link:focus,
.sidebar-link.active {
  color: var(--white);
  outline: none;
}
.sidebar-link:focus-visible { outline: 2px solid var(--white); outline-offset: 2px; }

/* Numbering prefix */
.sidebar-link span {
  opacity: 0.5;
  margin-bottom: 2px;
  display: block;
  font-size: 0.55rem;
}

/* ============================================================
   MOBILE BOTTOM NAV — shown only on mobile/tablet
============================================================ */
.mobile-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 200;
  background: var(--dark);
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 0.4rem 0 env(safe-area-inset-bottom, 0.4rem);
}

.mobile-nav__list {
  display: flex;
  justify-content: space-around;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

.mobile-nav__item { flex: 1; }

.mobile-nav__link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 0.5rem 0.25rem;
  text-decoration: none;
  color: rgba(255,255,255,0.4);
  font-size: 0.58rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: color var(--transition);
}
.mobile-nav__link:hover,
.mobile-nav__link.active { color: var(--white); }
.mobile-nav__link:focus-visible { outline: 2px solid var(--teal); outline-offset: 2px; }

.mobile-nav__icon {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.mobile-nav__dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: transparent;
  transition: background var(--transition);
}
.mobile-nav__link.active .mobile-nav__dot { background: var(--teal); }