.app-layout {
  display: flex;
  min-height: 100vh;
  min-height: 100dvh;
}

/* —— Sidebar —— */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  height: 100dvh;
  background: var(--bg);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: calc(var(--space-6) + var(--safe-top)) var(--space-4) calc(var(--space-6) + var(--safe-bottom));
  z-index: 100;
}

.sidebar-logo {
  display: block;
  margin-bottom: 0.35rem;
  width: fit-content;
}

.sidebar-logo img {
  height: 22px;
  width: auto;
}

.sidebar-logo .logo-for-light {
  display: none;
}

[data-theme="light"] .sidebar-logo .logo-for-dark {
  display: none;
}

[data-theme="light"] .sidebar-logo .logo-for-light {
  display: block;
}

.sidebar-tagline {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-bottom: var(--space-8);
  font-weight: 400;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.625rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: color var(--transition), background var(--transition);
}

.sidebar-link:hover {
  color: var(--text);
  background: var(--bg-muted);
}

.sidebar-link.active {
  color: var(--text);
  background: var(--bg-muted);
}

.sidebar-link svg {
  width: 18px;
  height: 18px;
  opacity: 0.65;
  flex-shrink: 0;
}

.sidebar-link.active svg {
  opacity: 1;
}

.sidebar-footer {
  padding-top: var(--space-4);
  border-top: 1px solid var(--border);
  font-size: var(--text-xs);
  color: var(--text-faint);
  letter-spacing: 0.04em;
}

/* —— Main ——
   Desktop: fill space beside sidebar, equal left/right gutters,
   shared content column so every page lines up. */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  width: calc(100% - var(--sidebar-width));
  max-width: none;
  padding: calc(var(--space-6) + var(--safe-top)) max(var(--page-gutter), var(--safe-right)) calc(var(--space-6) + var(--safe-bottom)) max(var(--page-gutter), var(--safe-left));
  box-sizing: border-box;
  display: grid;
  grid-template-columns: minmax(0, var(--content-max));
  justify-content: center;
  align-content: start;
}

.page-header,
.header-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-5);
  margin-bottom: var(--space-6);
}

.page-header h1,
.header-row h1 {
  margin-bottom: 0.35rem;
  font-size: var(--text-2xl);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
}

.header-row.dashboard-header h1 {
  font-size: clamp(2.25rem, 4vw, 3.25rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: var(--tracking-tight);
}

.header-row.dashboard-header p,
.header-row.dashboard-header #subtitle {
  font-size: var(--text-base);
  color: var(--text-secondary);
}

.page-header p,
.header-row p,
#subtitle {
  color: var(--text-muted);
  font-size: var(--text-sm);
  font-weight: 400;
}

.header-user {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

/* —— Mobile nav —— */
.mobile-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 0.375rem max(0px, var(--safe-right)) calc(0.375rem + var(--safe-bottom)) max(0px, var(--safe-left));
  background: var(--glass-bg);
  backdrop-filter: blur(28px) saturate(1.85);
  -webkit-backdrop-filter: blur(28px) saturate(1.85);
  border-top: 1px solid var(--glass-border);
  box-shadow: inset 0 1px 0 var(--glass-highlight);
}

.mobile-nav::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 1px;
  pointer-events: none;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--glass-highlight) 20%,
    var(--glass-highlight) 80%,
    transparent 100%
  );
  opacity: 0.7;
}

.mobile-nav-inner {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: space-around;
  max-width: 480px;
  margin: 0 auto;
}

.mobile-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  padding: 0.5rem 0.625rem;
  min-width: 3.5rem;
  font-size: 0.625rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--text-faint);
  transition: color var(--transition);
}

.mobile-link.active {
  color: var(--text);
}

.mobile-link svg {
  width: 20px;
  height: 20px;
}

/* —— Practice progress (static — no bounce) —— */
.practice-layout {
  max-width: none;
  width: 100%;
  margin: 0;
}

.practice-progress {
  position: sticky;
  top: var(--safe-top);
  z-index: 10;
  background: var(--bg);
  padding-top: var(--space-2);
  margin-bottom: var(--space-6);
}

.practice-goal-banner {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.35rem 0.65rem;
  margin-top: var(--space-3);
  padding: 0.65rem 0.9rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--bg-muted);
}

.practice-goal-banner[hidden] {
  display: none;
}

.practice-goal-label {
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 500;
  flex-shrink: 0;
}

.practice-goal-label::after {
  content: ':';
}

.practice-goal-text {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-snug);
}

.tri-progress {
  display: flex;
  gap: 4px;
  margin-bottom: 0.5rem;
}

.tri-bar {
  flex: 1;
  height: 2px;
  background: var(--border);
  border-radius: 1px;
  overflow: hidden;
}

.tri-bar-fill {
  height: 100%;
  width: 0;
  background: var(--accent);
  transition: none;
  transform: none;
}

.tri-bar.filled .tri-bar-fill,
.tri-bar.in-progress .tri-bar-fill {
  width: 100%;
  animation: none !important;
  transform: none !important;
  opacity: 1;
}

.tri-bar.in-progress .tri-bar-fill {
  opacity: 0.4;
}

.tri-bar.empty .tri-bar-fill {
  width: 0;
}

.tri-progress-labels {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0;
  font-size: 0.6875rem;
  color: var(--text-faint);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  font-weight: 500;
}

.tri-label.active {
  color: var(--text);
}

.tri-label.done {
  color: var(--text-muted);
}

.practice-step {
  display: none;
}

.practice-step.active {
  display: block;
}

/* —— Practice page layout —— */
.main-content--practice {
  grid-template-columns: minmax(0, 1fr);
  padding-top: calc(var(--space-4) + var(--safe-top));
  padding-bottom: calc(var(--space-4) + var(--safe-bottom));
  min-height: 100vh;
  min-height: 100dvh;
  box-sizing: border-box;
}

.practice-layout {
  display: flex;
  flex-direction: column;
  width: 100%;
  min-height: calc(100dvh - var(--space-4) * 2 - var(--safe-top) - var(--safe-bottom));
}

.practice-progress {
  flex-shrink: 0;
}

.practice-step--centered.active {
  display: flex;
  flex: 1;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: var(--space-6) 0;
  min-height: 0;
}

.practice-stage {
  width: 100%;
  max-width: 42rem;
}

.practice-step--research.active {
  display: flex;
  flex: 1;
  flex-direction: column;
  min-height: 0;
  gap: var(--space-5);
}

/* —— Responsive —— */
@media (max-width: 1024px) {
  :root {
    --page-gutter: var(--space-5);
  }
}

@media (max-width: 768px) {
  :root {
    /* Keep side margins roomy on phones — never squeeze below ~20px */
    --page-gutter: 1.5rem;
    /* Guarantee room for the status bar / Dynamic Island even when
       env(safe-area-inset-top) fails to report (common in WebKit). */
    --safe-top: max(constant(safe-area-inset-top, 0px), 47px);
    --safe-top: max(env(safe-area-inset-top, 0px), 47px);
  }

  .sidebar {
    display: none;
  }

  .main-content {
    margin-left: 0;
    width: 100%;
    padding: calc(var(--space-5) + var(--safe-top)) max(var(--page-gutter), var(--safe-right)) calc(6rem + var(--safe-bottom)) max(var(--page-gutter), var(--safe-left));
    row-gap: var(--space-5);
  }

  .main-content--practice {
    padding-top: calc(var(--space-5) + var(--safe-top));
    padding-bottom: calc(6rem + var(--safe-bottom));
  }

  .mobile-nav {
    display: block;
  }

  h1,
  .header-row h1,
  .page-header h1 {
    font-size: var(--text-xl);
  }

  .header-row.dashboard-header h1 {
    font-size: clamp(1.75rem, 8vw, 2.25rem);
  }

  .header-row,
  .page-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
  }

  /* Subcopy adds clutter under titles on small screens */
  .header-row p,
  .page-header p,
  #subtitle {
    display: none;
  }

  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
  }

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .topic-actions .topic-action-btn,
  .topic-actions .category-dropdown {
    width: 100%;
  }

  .topic-actions .category-select {
    width: 100%;
  }

  .practice-progress {
    margin-bottom: var(--space-5);
  }

  .practice-goal-banner {
    display: none;
  }

  .practice-step--centered.active {
    padding: var(--space-5) 0;
  }

  .research-header {
    align-items: flex-start;
  }

  .speak-timer {
    font-size: 2.25rem;
  }

  .mic-button {
    width: 88px;
    height: 88px;
  }
}

@media (max-width: 480px) {
  :root {
    --page-gutter: 1.5rem;
  }

  .main-content {
    padding: calc(var(--space-5) + var(--safe-top)) max(var(--page-gutter), var(--safe-right)) calc(6rem + var(--safe-bottom)) max(var(--page-gutter), var(--safe-left));
  }

  .main-content--practice {
    padding-top: calc(var(--space-5) + var(--safe-top));
    padding-bottom: calc(6rem + var(--safe-bottom));
  }

  .stat-value {
    font-size: 1.25rem;
  }

  .stat-grid {
    gap: var(--space-3) var(--space-4);
  }

  .mobile-link {
    min-width: 0;
    padding: 0.5rem 0.35rem;
    font-size: 0.6rem;
  }
}