/* Header */
  header.hero {
    position: relative;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 36px 32px;
    background:
      linear-gradient(180deg, var(--hero-grad) 0%, transparent 100%),
      linear-gradient(180deg, var(--surface-2) 0%, var(--surface) 100%);
    overflow: hidden;
    margin-bottom: 24px;
  }
  /* Relax the hero's overflow:hidden while a dropdown menu is open so the menu
     is not clipped at the bottom. Relies on :has(), supported in modern browsers. */
  header.hero:has(.lv-menu:not([hidden])) {
    overflow: visible;
  }
  header.hero::before {
    content: "";
    position: absolute; inset: 0;
    background: radial-gradient(600px 200px at 90% 0%, rgba(59, 130, 246, 0.18), transparent 60%);
    pointer-events: none;
    /* When hero is overflow:visible (dropdown open), match the rounded corners on
       the pseudo element so the gradient stays inside the rounded boundary. */
    border-radius: inherit;
  }
  .eyebrow {
    font-size: 12px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--accent-2);
    font-weight: 600;
    margin-bottom: 10px;
  }
  h1 {
    margin: 0 0 8px;
    font-size: clamp(28px, 4vw, 40px);
    line-height: 1.15;
    font-weight: 700;
    letter-spacing: -0.02em;
  }
  h1 em {
    font-style: italic;
    background: linear-gradient(120deg, #fb923c, #f97316 60%, #22c55e);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
  /* Instructor badge (inside hero, below h1): hidden LinkedIn easter egg.
     Hover and active states give a pressable feel; a short tap does nothing.
     Holding for ~3 seconds fills the ::after progress gradient and, when
     complete, opens the profile. */
  .instructor {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin: 0 0 20px;
    padding: 6px 12px 6px 6px;
    background: rgba(249, 115, 22, 0.08);
    border: 1px solid rgba(249, 115, 22, 0.22);
    border-radius: 999px;
    cursor: pointer;
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
    -webkit-tap-highlight-color: transparent;
    position: relative;
    overflow: hidden;
    transition: border-color 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease, background-color 0.2s ease;
  }
  .instructor:hover {
    border-color: var(--accent);
    background: rgba(249, 115, 22, 0.14);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(249, 115, 22, 0.20);
  }
  .instructor:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(249, 115, 22, 0.18);
  }
  .instructor::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 0;
    background: linear-gradient(90deg, rgba(249, 115, 22, 0.42), rgba(34, 197, 94, 0.36));
    pointer-events: none;
    z-index: 0;
    transition: width 0s linear;
  }
  .instructor.pressing::after {
    width: 100%;
    transition: width 3s linear;
  }
  .instructor > * {
    position: relative;
    z-index: 1;
  }
  .instructor.triggered {
    border-color: var(--mvp);
    background: var(--mvp-bg);
    animation: instructorPulse 0.7s ease;
  }
  @keyframes instructorPulse {
    0%   { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.55); }
    100% { box-shadow: 0 0 0 18px rgba(34, 197, 94, 0); }
  }
  .instructor-label {
    text-transform: uppercase;
    letter-spacing: 0.14em;
    font-size: 10.5px;
    font-weight: 700;
    color: #0b0f17;
    background: var(--accent-2);
    padding: 4px 10px;
    border-radius: 999px;
  }
  .instructor-name {
    color: var(--text);
    font-size: 13.5px;
    font-weight: 600;
    letter-spacing: -0.005em;
  }

  /* Hero controls: level filters and the framework/project selector (replaces
     the old legend). Kept in the hero so this stable, rarely-changing UI does
     not crowd the toolbar. */
  .hero-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-top: 20px;
    flex-wrap: wrap;
  }
  .level-filters {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 8px;
  }
  .level-filter-pill {
    appearance: none;
    border: 1px solid var(--border);
    background: var(--surface-3);
    color: var(--text-dim);
    padding: 8px 14px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.15s ease;
    white-space: nowrap;
  }
  .level-filter-pill:hover {
    background: var(--surface-2);
    border-color: var(--text-mute);
    color: var(--text);
  }
  .level-filter-pill.active.mvp {
    background: var(--mvp-bg);
    border-color: var(--mvp-border);
    color: var(--mvp);
    box-shadow: 0 0 0 3px var(--mvp-strong);
  }
  .level-filter-pill.active.release {
    background: var(--release-bg);
    border-color: var(--release-border);
    color: var(--release);
    box-shadow: 0 0 0 3px var(--release-strong);
  }
  .level-filter-pill.active.both {
    background: rgba(239, 68, 68, 0.10);
    border-color: rgba(239, 68, 68, 0.55);
    color: #ef4444;
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.18);
    font-weight: 600;
  }
  [data-theme="light"] .level-filter-pill.active.both {
    color: #b91c1c;
    background: rgba(239, 68, 68, 0.08);
    border-color: rgba(220, 38, 38, 0.55);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.16);
  }

  /* Hero project + framework + backend compact card pill.
     Layout: 3 rows (project / framework / backend) stacked in the left column,
     chevron vertically centered on the right.
     Takes little horizontal space (a small rectangular card replacing the
     older single-line pill). */
  .hero-project-pill {
    appearance: none;
    border: 1px solid var(--border);
    background: var(--surface-3);
    color: var(--text);
    padding: 8px 12px;
    border-radius: 12px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    flex-direction: row;
    align-items: center;
    gap: 8px;
    transition: all 0.15s ease;
    max-width: 100%;
    min-width: 140px;
    text-align: left;
    line-height: 1.2;
  }
  .hero-project-pill:hover { background: var(--surface-2); border-color: var(--accent); }
  .hero-project-pill:disabled, .hero-project-pill[disabled] {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
    filter: grayscale(0.6);
  }
  /* Left column: 3 stacked rows */
  .hero-project-pill .proj-pill-rows {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 3px;
    flex: 1;
    min-width: 0;
  }
  /* Each row: icon + label laid out horizontally */
  .hero-project-pill .proj-pill-row {
    display: flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
    min-width: 0;
  }
  /* Top row: emphasized project name */
  .hero-project-pill .proj-pill-project { font-size: 13px; }
  .hero-project-pill .proj-pill-icon { font-size: 14px; line-height: 1; flex-shrink: 0; }
  .hero-project-pill .proj-pill-name {
    font-weight: 700;
    color: var(--accent-2);
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  /* Bottom rows: framework + backend rendered smaller and dimmer */
  .hero-project-pill .proj-pill-framework,
  .hero-project-pill .proj-pill-backend {
    font-size: 11.5px;
    color: var(--text-dim);
    font-weight: 500;
  }
  .hero-project-pill .fw-pill-icon,
  .hero-project-pill .be-pill-icon { font-size: 13px; line-height: 1; flex-shrink: 0; }
  .hero-project-pill .fw-pill-label,
  .hero-project-pill .be-pill-label {
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
  }
  /* Right column: vertically centered chevron */
  .hero-project-pill .fw-pill-chevron {
    color: var(--text-mute);
    font-size: 12px;
    flex-shrink: 0;
    align-self: center;
  }
  /* Extra mobile tightening so the project name does not overflow */
  @media (max-width: 560px) {
    .hero-project-pill { min-width: 120px; padding: 6px 10px; }
    .hero-project-pill .proj-pill-name { max-width: 130px; }
  }
  @media (max-width: 380px) {
    .hero-project-pill { min-width: 110px; }
    .hero-project-pill .proj-pill-project { font-size: 12px; }
    .hero-project-pill .proj-pill-framework,
    .hero-project-pill .proj-pill-backend { font-size: 11px; }
  }

  .dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; flex-shrink: 0; }
  .dot.mvp { background: var(--mvp); box-shadow: 0 0 0 3px var(--mvp-strong); }
  .dot.release { background: var(--release); box-shadow: 0 0 0 3px var(--release-strong); }

  /* Lock button: green-tinted when active (locked), neutral otherwise.
     The right-side icon is swapped by JS to reflect the open/closed lock state. */
  #lockBtn .lock-icon { font-size: 14px; line-height: 1; }
  #lockBtn.locked {
    background: var(--mvp-bg);
    border-color: var(--mvp-border);
    color: var(--mvp);
  }
  #lockBtn.locked:hover {
    background: var(--mvp-strong);
    border-color: var(--mvp);
  }

  /* When body.locked: checks are frozen, framework/reset/import become disabled,
     and export/print are visually emphasized so the user spots the natural next action. */
  body.locked .level {
    pointer-events: none;
    cursor: not-allowed;
  }
  /* Emphasized Print + Export: gold border and glow while the checklist is locked */
  body.locked #printBtn,
  body.locked #exportBtn {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(249, 115, 22, 0.18), 0 4px 14px rgba(249, 115, 22, 0.18);
    font-weight: 600;
  }
  body.locked #exportBtn {
    background: var(--hero-grad);
    color: var(--text);
  }
  /* While the lock is active, show a thin info strip (hint pill) above hero-controls */
  body.locked .hero::after {
    content: attr(data-locked-msg);
    display: block;
    text-align: center;
    background: var(--mvp-bg);
    border: 1px solid var(--mvp-border);
    border-radius: 999px;
    color: var(--mvp);
    font-size: 12px;
    font-weight: 600;
    padding: 6px 14px;
    margin-top: 14px;
  }

  /* Level view filters:
     - "MVP only": all Release rows are hidden (checked or unchecked)
     - "Release only": all MVP rows are hidden
     - The top summary bars in the progress blocks shrink accordingly. */
  body.view-mvp-only .progress-block[data-level="release"],
  body.view-mvp-only .progress-block[data-level="total"] { display: none !important; }
  body.view-release-only .progress-block[data-level="mvp"],
  body.view-release-only .progress-block[data-level="total"] { display: none !important; }

  body.view-mvp-only .level.release { display: none !important; }
  body.view-release-only .level.mvp { display: none !important; }

  /* viewFilter (status) rules: combined with viewMode (level group) they yield 9 combinations:
     - filter-pending: all checked rows hidden (only to-do items visible)
     - filter-done:    all unchecked rows hidden (only completed items visible)
     - (no filter):    all rows visible regardless of status

     view-mvp-only / view-release-only already hide the opposite level; combined
     with these rules, e.g. view-mvp-only + filter-pending shows only unchecked MVP rows. */
  body.filter-pending .level.checked { display: none !important; }
  body.filter-done .level:not(.checked) { display: none !important; }

  /* Toolbar */
  .toolbar {
    position: sticky;
    top: 0;
    z-index: 50;
    margin: 18px 0 24px;
    padding: 12px;
    background: var(--toolbar-bg);
    backdrop-filter: saturate(140%) blur(10px);
    -webkit-backdrop-filter: saturate(140%) blur(10px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 12px;
    align-items: center;
  }
  .search {
    display: flex; align-items: center; gap: 10px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 8px 14px;
  }
  .search input {
    flex: 1;
    background: transparent;
    border: 0;
    outline: 0;
    color: var(--text);
    font-size: 14px;
    padding: 4px 0;
  }
  .search svg { color: var(--text-mute); flex-shrink: 0; }
  .actions {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 4px;
    row-gap: 8px;
  }
  .action-group {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 0 10px;
    position: relative;
  }
  .action-group:first-child { padding-left: 0; }
  .action-group:last-child { padding-right: 0; }
  .action-group + .action-group::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 22px;
    background: var(--border);
    opacity: 0.7;
  }
  .btn {
    appearance: none;
    border: 1px solid var(--border);
    background: var(--surface-2);
    color: var(--text);
    font-size: 13px;
    font-weight: 500;
    padding: 9px 14px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.15s ease;
    white-space: nowrap;
  }
  .btn:hover { background: var(--surface-3); border-color: #2c3445; }
  .btn:disabled, .btn[disabled] {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
    filter: grayscale(0.6);
  }
  .btn.primary {
    background: linear-gradient(180deg, var(--accent-2), var(--accent));
    color: #0b0f17;
    border-color: transparent;
    font-weight: 600;
  }
  .btn.primary:hover { filter: brightness(1.05); }
  .btn.ghost { background: transparent; }
  /* Orange highlight on toolbar toggle pairs that signals "you are in this mode".
     JS adds or removes the .active class based on currentMode (All How-To /
     All List) and on collapsedCats vs category count (Expand All / Collapse All).
     Applied together with aria-pressed for accessibility. */
  .btn.ghost.active {
    background: rgba(249, 115, 22, 0.14);
    border-color: var(--accent);
    color: var(--accent-2);
    font-weight: 600;
  }
  .btn.ghost.active:hover {
    background: rgba(249, 115, 22, 0.22);
    border-color: var(--accent);
  }
  .btn.danger { color: #fca5a5; }
  .btn.danger:hover { color: #fff; background: rgba(239, 68, 68, 0.18); border-color: rgba(239, 68, 68, 0.35); }

  /* Pinned top area: toolbar + progress card stick together at the top */
  .sticky-bar {
    position: sticky;
    top: 0;
    z-index: 50;
    margin: 18px 0 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
  }
  .sticky-bar > .toolbar {
    position: static;
    margin: 0;
  }
  .sticky-bar > .progress-card {
    margin: 0;
  }

  /* Mobile actions open/close toggle: hidden on desktop, shown on mobile */
  .actions-toggle { display: none; }
  .actions-toggle .icon-close { display: none; }

  /* Progress */
  .progress-card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 22px;
    background: var(--toolbar-bg);
    backdrop-filter: saturate(140%) blur(10px);
    -webkit-backdrop-filter: saturate(140%) blur(10px);
    margin-bottom: 24px;
  }
  .progress-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 14px 22px;
    align-items: center;
  }
  .progress-block { }
  .progress-label {
    display: flex; justify-content: space-between; align-items: baseline;
    font-size: 12px;
    color: var(--text-dim);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
  }
  .progress-label .num { color: var(--text); font-weight: 600; font-size: 13px; letter-spacing: 0; }
  .bar {
    height: 8px;
    border-radius: 999px;
    background: var(--surface-3);
    overflow: hidden;
  }
  .bar > span {
    display: block;
    height: 100%;
    width: 0%;
    transition: width 0.4s cubic-bezier(0.2, 0.7, 0.2, 1);
    border-radius: 999px;
  }
  .bar.total > span { background: linear-gradient(90deg, var(--mvp), var(--release)); }
  .bar.mvp-bar > span { background: var(--mvp); }
  .bar.release-bar > span { background: var(--release); }