mathew/frontend/app/assets/css/_layout.scss

@use 'mixins' as *;

// ---------- Layout shell ----------
.app-shell { display: flex; min-height: 100vh; }

.app-main { flex: 1; min-width: 0; }

// ---------- Sidebar (site navigation) ----------
.site-sidebar {
  position: sticky;
  top: 0;
  z-index: 60;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: var(--sidebar-w);
  height: 100vh;
  padding: 22px 18px;
  backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-right: 1px solid var(--border);
  transition: width 0.22s ease, padding 0.22s ease;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 6px;
  margin-top: 26px;

  .btn { justify-content: center; margin-top: 6px; }
}

.sidebar-footer {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  margin-top: auto;

  // the footer buttons read as nav rows — icon then label, centred, taking the
  // sidebar's width so they grow and shrink with it (both classes are grid, which
  // would drop the label under the icon, and the label shows on mobile too, so
  // the row layout lives outside the desktop block)
  .panel-icon-btn,
  .icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 0.86rem;
    font-weight: 550;
    white-space: nowrap;

    svg { flex-shrink: 0; }
  }
}

// The account row: who the wiki is being written as. It reads as one of the
// sidebar's rows — an initial in a circle, the name while the sidebar has room
// for it, and the way out at the end of the line.
.account-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 550;
  white-space: nowrap;
}

.account-avatar { @include avatar(30px, 0.84rem); }

// the row's avatar and name together form the button that opens the profile
// popup; the exit button beside it stays its own
.account-open {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex: 1;
  min-width: 0;
  border-radius: 9px;
  text-align: left;

  &:hover .account-avatar { background: color-mix(in srgb, var(--accent) 24%, transparent); }

  &:hover .account-name { color: var(--accent); }
}

.account-name {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text);
}

.account-exit {
  @include icon-target(24px, 7px);
  color: var(--faint);
  transition: color 0.15s, background-color 0.15s;

  &:hover { background: var(--surface-2); color: var(--danger); }
}

@media (max-width: 900px) {
  .app-shell { flex-direction: column; }

  .site-sidebar {
    width: 100%;
    height: auto;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    row-gap: 10px;
    padding: 12px clamp(16px, 4vw, 32px);
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  .sidebar-nav {
    flex-direction: row;
    align-items: center;
    margin-top: 0;

    .btn { margin-top: 0; }
  }

  .sidebar-search { width: auto; min-width: 132px; max-width: 240px; }

  .sidebar-footer { margin-top: 0; flex-direction: row; align-items: center; }

  // the rail is a desktop affordance — the top bar is always expanded
  .sidebar-collapse-btn { display: none; }
}

// ---------- Collapsed sidebar: an icon rail (desktop only) ----------
.sidebar-collapse-btn svg { transition: transform 0.22s ease; }

@media (min-width: 901px) {
  // desktop: stack above the reading surface (book layer, z 70/74) so the
  // book's edge shadow falls behind the nav instead of darkening it
  .site-sidebar { z-index: 75; }

  // on desktop they fill the sidebar's width instead of their own: the collapsing
  // sidebar relayouts them every frame, the rail drops their labels (.hide-collapsed)
  // and their fixed heights hold, so the icons ride the centre the whole way
  .sidebar-footer .panel-icon-btn,
  .sidebar-footer .icon-btn,
  .sidebar-footer .account-row {
    width: 100%;
  }

  // the root class also moves the fixed reading surface in step, since
  // --sidebar-w feeds the book layer's left inset
  html.sidebar-collapsed { --sidebar-w: 68px; }

  .site-sidebar.collapsed {
    padding-inline: 12px;

    .sidebar-collapse-btn svg { transform: rotate(180deg); }

    // with the labels gone, center what's left: the icons. The buttons keep
    // the height the labels used to give them (font-size x line-height 1.6
    // + their vertical padding), so the rail doesn't shrink them
    .sidebar-search {
      justify-content: center;
      padding-inline: 0;
      min-height: 40px; // 9+9 padding + 13.76px x 1.6 label line
    }

    .nav-link {
      justify-content: center;
      padding-inline: 0;
      min-height: 39px; // 8+8 padding + 14.4px x 1.6 label line
    }

    // the waiting count is not carried off with the labels: pinned to the
    // icon's corner, it stays a dot on the rail
    .sidebar-requests .requests-count {
      position: absolute;
      top: 2px;
      right: 2px;
      margin-left: 0;
    }

    .sidebar-nav .btn {
      min-height: 35px; // 7+7 padding + 13.12px x 1.6 label line
    }

    // the mark is all that's left of the wordmark, so it rides the rail's
    // centre like the icons beside it
    .logo { justify-content: center; }

    // the way out drops away with the labels, leaving just the avatar centred
    // on the rail; the avatar sets the row's height now, so the rail doesn't
    // shrink it
    .account-row {
      min-height: 44px; // 1+1 border + 6+6 padding + 30px avatar
    }
  }

  // collapsing drops the labels at once; expanding waits for the rail to
  // open before fading them back in, so they never render squished at
  // half width mid-transition
  .hide-collapsed { transition: opacity 0.16s ease 0.1s, display 0.26s allow-discrete; }

  @starting-style {
    .hide-collapsed { opacity: 0; }
  }

  html.sidebar-collapsed .hide-collapsed { display: none; transition: none; }
}

// ---------- Sidebar tallies: articles open, requests waiting ----------
.sidebar-open.is-current {
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 9%, transparent);
}

.tabs-count,
.requests-count {
  margin-left: auto;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  display: inline-grid;
  place-items: center;
  border-radius: 9px;
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  color: var(--accent);
  font-size: 0.68rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

// the waiting pile is the very reason to open the desk, so its number stays
// on the collapsed rail — the link is the frame it rides the corner of
.sidebar-requests { position: relative; }

.logo {
  display: flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
  color: var(--text);
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

// a 40px square — the height the nav rows settle at (the search bar's own
// padding + label line), so the sigma reads as one of the sidebar's buttons
.logo-mark {
  width: 40px;
  height: 40px;
  border-radius: 11px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  font-size: 1.4rem;
  font-weight: 700;
  box-shadow: 0 4px 14px -4px color-mix(in srgb, var(--accent) 60%, transparent);
}

.logo-accent { @include gradient-text; }

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 13px;
  border-radius: 9px;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 550;
  @include hover-row;

  &.router-link-active {
    color: var(--accent);
    background: color-mix(in srgb, var(--accent) 9%, transparent);
  }
}

// small icon button used in modal/popup headers
.panel-icon-btn { @include icon-target(30px, 8px); color: var(--muted); @include hover-row; }