/* App shell: sidebar on wide screens, top bar + tab bar on phones. */

#app { min-height: 100vh; min-height: 100dvh; }

.shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  min-height: 100vh;
  min-height: 100dvh;
}

/* ------------------------------------------------------------- sidebar */
.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  gap: var(--s2);
  padding: var(--s5) var(--s4);
  border-right: var(--bw) solid var(--hair);
  overflow-y: auto;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: var(--s1) var(--s2);
  margin-bottom: var(--s4);
  font-family: var(--font-display);
  font-variation-settings: 'SOFT' 100;
  font-weight: 800;
  font-size: 1.7rem;
  letter-spacing: -0.03em;
  line-height: 1;
  text-decoration: none;
  color: var(--ink);
  border-radius: 10px;
}
.wordmark .wordmark-dot { color: var(--brand); }
.wordmark svg { flex: none; }

.nav { display: flex; flex-direction: column; gap: 4px; }
.nav-item {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--s3);
  min-height: 46px;
  padding: 0.5rem 0.8rem;
  border: var(--bw) solid transparent;
  border-radius: var(--r);
  color: var(--ink-2);
  font-weight: 700;
  text-decoration: none;
  transition: background-color 0.15s ease, color 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}
.nav-item:hover { background: var(--sunken); color: var(--ink); }
.nav-item[aria-current='page'] {
  background: var(--brand-soft);
  border-color: var(--edge);
  color: var(--ink);
  box-shadow: 2px 2px 0 var(--drop);
}
.nav-item .badge-dot { margin-left: auto; }

.sidebar-foot { margin-top: auto; display: grid; gap: var(--s3); }
.status-card {
  display: grid;
  gap: var(--s3);
  padding: var(--s3) var(--s4);
  border: var(--bw) solid var(--hair);
  border-radius: var(--r-lg);
  background: var(--surface);
}
.status-row { display: flex; align-items: center; gap: var(--s2); font-weight: 700; font-size: var(--fs-sm); }
.status-row .num { margin-left: auto; font-variant-numeric: tabular-nums; }

/* ---------------------------------------------------------------- main */
.main { min-width: 0; }
.page {
  width: min(1040px, 100%);
  margin: 0 auto;
  padding: var(--s8) var(--s6) var(--s16);
}
.page-narrow { width: min(720px, 100%); }
.page-head { margin-bottom: var(--s6); }
.page-head h1 { margin-bottom: var(--s2); }
.page-head p { color: var(--ink-2); font-size: var(--fs-lg); max-width: 60ch; }
.page > .section { margin-top: var(--s8); }
.page > .section:first-child, .page > .page-head + .section, .page > .filters + div > .section:first-child { margin-top: 0; }
.section + .section { margin-top: var(--s8); }
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--s3);
  margin-bottom: var(--s4);
}
.section-head h2 { font-size: var(--fs-xl); }

/* ------------------------------------------------- mobile bars (hidden ≥960) */
.topbar, .tabbar { display: none; }

@media (max-width: 959px) {
  .shell { display: block; }
  .sidebar { display: none; }

  .topbar {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--s3);
    height: var(--topbar-h);
    padding: 0 var(--s4);
    background: var(--paper);
    border-bottom: var(--bw) solid var(--hair);
  }
  .topbar .wordmark { margin: 0; font-size: 1.45rem; padding: 0; }
  .topbar-stats { display: flex; align-items: center; gap: var(--s2); }

  .tabbar {
    position: fixed;
    left: 0; right: 0; bottom: 0;
    z-index: 100;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    height: calc(var(--tabbar-h) + env(safe-area-inset-bottom, 0px));
    padding-bottom: env(safe-area-inset-bottom, 0px);
    background: var(--surface);
    border-top: var(--bw) solid var(--edge);
  }
  .tab {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    color: var(--ink-3);
    font-size: 0.68rem;
    font-weight: 800;
    text-decoration: none;
    -webkit-tap-highlight-color: transparent;
  }
  .tab .tab-icon {
    display: grid; place-items: center;
    width: 46px; height: 30px;
    border-radius: 999px;
    transition: background-color 0.2s ease, transform 0.2s var(--ease-spring);
  }
  .tab[aria-current='page'] { color: var(--ink); }
  .tab[aria-current='page'] .tab-icon { background: var(--brand); color: var(--on-color); transform: translateY(-1px); }
  .tab .badge-dot { position: absolute; top: 6px; left: calc(50% + 8px); transform: scale(0.85); }

  .page { padding: var(--s5) var(--s4) calc(var(--tabbar-h) + var(--s12)); }
}

.stat-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  min-height: 34px;
  padding: 0.2rem 0.65rem;
  border: var(--bw) solid var(--hair);
  border-radius: 999px;
  background: var(--surface);
  font-weight: 800;
  font-size: var(--fs-sm);
  font-variant-numeric: tabular-nums;
  text-decoration: none;
  color: var(--ink);
}
.stat-pill.is-lit { border-color: var(--edge); }
.stat-pill .flame-off { color: var(--ink-3); }
.stat-pill .flame-on { color: var(--orange); }

/* focus mode: lesson player takes the whole screen */
body.mode-focus .shell { display: block; }
body.mode-focus .sidebar,
body.mode-focus .topbar,
body.mode-focus .tabbar { display: none; }
body.mode-focus .main { min-height: 100vh; min-height: 100dvh; }

/* generic responsive grids */
.grid { display: grid; gap: var(--s4); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-auto { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
@media (max-width: 720px) {
  .grid-2, .grid-3 { grid-template-columns: minmax(0, 1fr); }
}