/* ============================================================
   Awall surface stylesheet: sidebar.css
   Split from styles.css (F1, issue #186) — NO rule changes.
   Owns: sidebar nav + collapsed icon-rail (shell / S1)
   Concatenating every surfaces/*.css in base.html <link> order
   reproduces the original styles.css byte-for-byte.
   ============================================================ */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width-current);
  height: 100vh;
  height: 100dvh; /* fit the dynamic mobile viewport so the footer is reachable */
  background: var(--sidebar-bg);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overflow-x: hidden;
  /* As a mobile drawer the sidebar scrolls internally; contain keeps that
     scroll from chaining to the locked page behind it (#208). */
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  z-index: 100;
  flex-shrink: 0;
  transition: width var(--transition-base) var(--ease-out);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: var(--space-4) var(--space-6) var(--space-3);
  border-bottom: 1px solid var(--color-sidebar-brand-border);
}

.sidebar-logo {
  width: 36px;
  height: 36px;
  display: block;
  flex-shrink: 0;
}

.sidebar-brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  min-width: 0;
}

.sidebar-brand-name {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 500;
  color: var(--color-sidebar-active-text);
  letter-spacing: -0.01em;
}

.sidebar-brand-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: lowercase;
  color: var(--sidebar-text);
  margin-top: 3px;
  white-space: nowrap;
}

.sidebar-nav {
  flex: 1;
  padding: var(--space-4) 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.sidebar-nav-section {
  padding: var(--space-4) var(--space-6) var(--space-1);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--sidebar-text);
  opacity: 0.55;
}

.sidebar-nav-section + .sidebar-nav-link {
  margin-top: 0;
}

.sidebar-nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-6);
  color: var(--sidebar-text);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-decoration: none;
  border-radius: 0;
  transition: background 200ms var(--ease-out, ease),
              color 200ms var(--ease-out, ease),
              border-color 200ms var(--ease-out, ease);
  border-left: 3px solid transparent;
}

.sidebar-nav-link:hover {
  color: var(--sidebar-text-hover);
  background: var(--color-sidebar-hover-bg);
  text-decoration: none;
}

.sidebar-nav-link:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: -2px;
  color: var(--sidebar-text-hover);
}

.sidebar-nav-link.active {
  color: var(--sidebar-active-text);
  background: var(--sidebar-active-bg);
  border-left-color: var(--color-primary);
  box-shadow: inset 1px 0 0 0 var(--color-primary-glow);
}

/* Soft accent glow next to active marker */
.sidebar-nav-link.active::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 28px;
  background: radial-gradient(ellipse at left center, var(--color-sidebar-glow-soft), transparent 70%);
  pointer-events: none;
}

.sidebar-nav-icon {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  opacity: 0.75;
}

.sidebar-nav-link.active .sidebar-nav-icon,
.sidebar-nav-link:hover .sidebar-nav-icon {
  opacity: 1;
}

/* Footer: stacked user identity (top) + actions strip (bottom). */
.sidebar-footer {
  padding: var(--space-4);
  border-top: 1px solid var(--color-sidebar-brand-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
  color: inherit;
  text-decoration: none;
}

.sidebar-user:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-btn);
}

.sidebar-user__avatar {
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
  user-select: none;
}

.sidebar-user__name {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-sidebar-text-strong);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

.sidebar-footer__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.sidebar-logout-form {
  margin: 0;
  flex: 1 1 auto;
  min-width: 0;
}

.sidebar-logout {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  width: 100%;
  min-height: 32px;
  padding: 6px 10px;
  background: transparent;
  border: 1px solid var(--color-sidebar-brand-border);
  border-radius: var(--radius-btn);
  color: var(--sidebar-text);
  font-family: inherit;
  font-size: var(--font-size-xs);
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition-fast),
              border-color var(--transition-fast),
              color var(--transition-fast);
}

.sidebar-logout::before {
  content: "";
  position: absolute;
  inset: -4px;
}

.sidebar-logout:hover {
  background: var(--color-sidebar-danger-soft);
  border-color: var(--color-sidebar-danger);
  color: var(--color-sidebar-danger);
}

.sidebar-logout:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.sidebar-logout__icon { flex: 0 0 auto; }
.sidebar-logout__label { white-space: nowrap; }

.sidebar-collapse-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  margin-left: auto;
  padding: 0;
  background: transparent;
  border: 1px solid var(--color-sidebar-brand-border);
  border-radius: var(--radius-btn);
  color: var(--sidebar-text);
  cursor: pointer;
  flex-shrink: 0;
  font-family: inherit;
  transition: background var(--transition-fast),
              color var(--transition-fast),
              border-color var(--transition-fast);
}

/* Hit-area extension: keeps the 28x28 visual chip but accepts a touch
   anywhere inside a 40x40 box (WCAG 2.5.5). */
.sidebar-collapse-btn::before {
  content: "";
  position: absolute;
  inset: -6px;
}

.sidebar-collapse-btn:hover {
  color: var(--sidebar-text-hover);
  background: var(--color-sidebar-hover-bg);
  border-color: rgba(255, 255, 255, 0.12);
}

.sidebar-collapse-icon {
  transition: transform var(--transition-base) var(--ease-out);
}

/* ---------------------------------------------------------
   4b. Sidebar — collapsed (icon-rail) state
   Activates only on viewports ≥ 768px; mobile drawer untouched.
   --------------------------------------------------------- */
@media (min-width: 768px) {
  [data-sidebar="collapsed"] {
    --sidebar-width-current: var(--sidebar-width-collapsed);
  }

  [data-sidebar="collapsed"] .sidebar-brand {
    padding: var(--space-4) 0;
    justify-content: center;
    border-bottom-color: transparent;
  }

  [data-sidebar="collapsed"] .sidebar-logo {
    width: 28px;
    height: 28px;
  }

  [data-sidebar="collapsed"] .sidebar-brand-text,
  [data-sidebar="collapsed"] .sidebar-user__name,
  [data-sidebar="collapsed"] .sidebar-logout__label,
  [data-sidebar="collapsed"] .sidebar-nav-label,
  [data-sidebar="collapsed"] .sidebar-nav-section {
    display: none;
  }

  [data-sidebar="collapsed"] .sidebar-nav-link {
    justify-content: center;
    padding: var(--space-2) 0;
    gap: 0;
  }

  [data-sidebar="collapsed"] .sidebar-nav-link.active::before {
    width: 100%;
  }

  [data-sidebar="collapsed"] .sidebar-footer {
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-2);
  }

  [data-sidebar="collapsed"] .sidebar-user {
    justify-content: center;
  }

  [data-sidebar="collapsed"] .sidebar-footer__actions {
    flex-direction: column;
    width: 100%;
    gap: var(--space-2);
  }

  [data-sidebar="collapsed"] .sidebar-logout-form {
    width: 100%;
    display: flex;
    justify-content: center;
  }

  [data-sidebar="collapsed"] .sidebar-logout {
    width: 28px;
    height: 28px;
    min-height: 28px;
    padding: 0;
  }

  /* Match the collapsed visual chip while keeping the 40x40 hit area
     bigger than the default ::before in expanded mode. */
  [data-sidebar="collapsed"] .sidebar-logout::before,
  [data-sidebar="collapsed"] .sidebar-collapse-btn::before {
    inset: -6px;
  }

  [data-sidebar="collapsed"] .sidebar-collapse-btn {
    margin-left: 0;
    width: 28px;
  }

  [data-sidebar="collapsed"] .sidebar-collapse-icon {
    transform: rotate(180deg);
  }

  /* Tooltip on hover for collapsed nav links */
  [data-sidebar="collapsed"] .sidebar-nav-link {
    position: relative;
  }

  [data-sidebar="collapsed"] .sidebar-nav-link::after {
    content: attr(data-label);
    position: absolute;
    left: calc(100% + 8px);
    top: 50%;
    transform: translateY(-50%);
    background: var(--color-elevated);
    color: var(--color-text-heading);
    font-size: var(--font-size-xs);
    font-weight: 500;
    padding: 4px 8px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-btn);
    box-shadow: var(--shadow-modal);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-fast);
    z-index: 200;
  }

  [data-sidebar="collapsed"] .sidebar-nav-link:hover::after,
  [data-sidebar="collapsed"] .sidebar-nav-link:focus-visible::after {
    opacity: 1;
  }
}