.app-shell { min-height: 100vh; }

.sidebar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: var(--z-sticky-nav);
  width: 100%;
  height: var(--desktop-nav-h);
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 14px;
  padding: 8px 22px;
  color: #dfe8e9;
  background:
    radial-gradient(circle at 8% 0%, rgba(28,145,135,.20), transparent 260px),
    linear-gradient(90deg, #132328 0%, #0d181c 100%);
  border-bottom: 1px solid rgba(255,255,255,.055);
  box-shadow: 0 12px 34px rgba(8,15,18,.10);
}
.brand {
  width: auto;
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 22px 0 0;
  color: #fff;
  background: transparent;
  border-right: 1px solid rgba(255,255,255,.08);
  text-align: left;
}
.brand-mark { width: 52px; height: 52px; flex: 0 0 52px; }
.brand-mark svg, .brand-mark img { width: 100%; height: 100%; }
.brand > span:last-child { min-width: 0; display: grid; }
.brand strong { color: #fff; font-size: 1.125rem; font-weight: 820; letter-spacing: -.035em; }
.brand small { margin-top: 2px; color: #9aafb3; font-size: .6875rem; font-weight: 600; letter-spacing: .01em; }

.main-nav {
  min-width: 0;
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
}
.main-nav::-webkit-scrollbar { display: none; }
.nav-section-label { display: none; }
.nav-item {
  position: relative;
  width: auto;
  min-width: max-content;
  min-height: 44px;
  flex: 0 0 auto;
  display: grid;
  grid-template-columns: 30px auto;
  align-items: center;
  gap: 7px;
  padding: 5px 10px 5px 7px;
  color: var(--nav-muted);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 12px;
  text-align: left;
  transition: background .18s ease, color .18s ease, border-color .18s ease, transform .18s ease;
}
.nav-item:hover { color: #f2f6f6; background: rgba(255,255,255,.05); border-color: rgba(255,255,255,.045); }
.nav-item.is-active {
  color: var(--nav-active-ink);
  background: linear-gradient(135deg, #e9c878, #d9ad4a);
  border-color: rgba(255,255,255,.12);
  box-shadow: 0 8px 20px rgba(0,0,0,.14);
}
.nav-item:active { transform: translateY(1px); }
.nav-icon {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  color: #86c9c2;
  background: rgba(35,141,131,.12);
  border: 1px solid rgba(117,199,190,.08);
  border-radius: 9px;
  font-family: var(--font-mono);
  font-size: .66667em;
  font-weight: 800;
  transition: background .18s ease, color .18s ease;
}
.nav-item.is-active .nav-icon { color: #15312f; background: rgba(255,255,255,.34); border-color: rgba(255,255,255,.20); }
.nav-copy { min-width: 0; display: grid; }
.nav-copy strong { color: inherit; font-size: .7em; font-weight: 780; white-space: nowrap; }
.nav-copy small { display: none; }
.nav-workspace:disabled { opacity: .43; }

.privacy-note { display: none; }

.main-area {
  min-height: 100vh;
  margin-left: 0;
  padding-top: var(--desktop-nav-h);
  background:
    radial-gradient(circle at 78% 0%, rgba(var(--accent-rgb),.13), transparent 33rem),
    radial-gradient(circle at 15% 23%, rgba(227,173,69,.11), transparent 27rem),
    linear-gradient(180deg, #f6f1e7 0%, #f0ece3 52%, #ece9e2 100%);
}


.view { width: min(var(--content-max), calc(100% - 56px)); margin: 0 auto; padding: 38px 0 82px; }
.view.is-visible { display: block; }


.page-intro {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0,1fr) auto;
  align-items: end;
  gap: 28px;
  padding: 34px 0 32px;
  border-bottom: 1px solid var(--line);
}
.page-intro::after { content: ""; position: absolute; left: 0; bottom: -1px; width: 72px; height: 2px; background: var(--accent); }
.page-intro h1 { margin-top: 5px; max-width: 850px; }
.page-intro p { max-width: 680px; margin-top: 11px; color: var(--muted-strong); font-size: .8em; line-height: 1.65; }
.intro-number { min-width: 118px; text-align: right; }
.intro-number strong { display: block; font-size: 2.26667em; letter-spacing: -.05em; }
.intro-number span { color: var(--muted); font-size: .53333em; font-weight: 750; text-transform: uppercase; letter-spacing: .1em; }

.study-view-count, .study-view-meta { display: inline-flex; align-items: center; gap: 7px; color: var(--muted); font-size: .6em; font-weight: 700; }
.study-view-count strong, .study-view-meta strong { color: var(--ink); font: 800 1.66667em/1 var(--font-display); }
.study-view-meta { width: 100%; justify-content: flex-end; margin-bottom: 12px; }

.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 22px; margin: 42px 0 20px; }
.section-heading h2 { margin-top: 5px; }
.section-subcopy { max-width: 610px; margin-top: 8px; color: var(--muted); font-size: .73333em; }
.catalog-heading-note { padding-bottom: 4px; color: var(--muted); font-size: .6em; font-weight: 700; }
.compact-heading { margin-top: 12px; }
.eyebrow { display: inline-flex; color: rgba(255,255,255,.72); font-size: .53333em; font-weight: 850; letter-spacing: .14em; text-transform: uppercase; }
.eyebrow.dark { color: var(--accent-strong); }

.hero {
  position: relative;
  min-height: 460px;
  overflow: hidden;
  display: grid;
  align-items: end;
  margin-top: 8px;
  background: var(--player);
  border-radius: 28px;
  box-shadow: 0 20px 50px rgba(16,24,28,.13);
}
.hero-cover, .hero-shade { position: absolute; inset: 0; }
.hero-cover { background-position: center; background-size: cover; transform: scale(1.01); }
.hero-shade { background: linear-gradient(90deg, rgba(8,13,16,.95) 0%, rgba(8,13,16,.72) 43%, rgba(8,13,16,.26) 74%, rgba(8,13,16,.12)); }
.hero-copy { position: relative; z-index: var(--z-raised); width: min(650px, 68%); padding: 48px; color: #fff; }
.hero-copy h1 { margin-top: 10px; color: #fff; font-size: clamp(2.53333em,5vw,4.4em); }
.hero-copy p { max-width: 590px; margin-top: 12px; color: #c2ccce; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 20px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.hero-progress-card {
  position: absolute;
  right: 26px;
  bottom: 26px;
  z-index: var(--z-sticky-decor);
  width: 220px;
  padding: 17px;
  color: #fff;
  background: rgba(12,18,21,.74);
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 16px;
  backdrop-filter: blur(14px);
}
.hero-progress-card > span { color: #aebabc; font-size: .53333em; font-weight: 800; letter-spacing: .12em; }
.hero-progress-card strong { display: block; margin-top: 5px; font-size: 1.6em; }
.hero-progress-card small { display: block; margin-top: 8px; color: #b8c2c4; font-size: .6em; }
.progress-track, .kit-progress-line, .workspace-progress-track, .real-progress-total-track, .progress-activity-track, .gamification-xp-track, .xp-reward-track {
  overflow: hidden;
  height: 5px;
  background: rgba(110,122,127,.18);
  border-radius: var(--r-pill);
}
.progress-track { margin-top: 10px; background: rgba(255,255,255,.14); }
.progress-track i, .kit-progress-line i, .workspace-progress-track i, .real-progress-total-track i, .progress-activity-track i, .gamification-xp-track i, .xp-reward-track i { display: block; width: 0; height: 100%; background: var(--accent); border-radius: inherit; transition: width .4s var(--ease); }
.progress-track i { background: var(--gold); }

.kit-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 18px; }

.kit-card {
  position: relative;
  min-width: 0;
  overflow: hidden;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: 0 1px 0 rgba(255,255,255,.75) inset;
  cursor: pointer;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), border-color .25s ease;
}
.kit-card:hover { transform: translateY(-4px); border-color: #c8ccc6; box-shadow: 0 18px 42px rgba(16,24,28,.09); }
.kit-card-media { position: relative; overflow: hidden; aspect-ratio: 16 / 9; background: linear-gradient(135deg,#1a252a,var(--player-deep)); }
.kit-card-cover, .kit-card-shade { position: absolute; inset: 0; }
.kit-card-cover { background-position: center; background-size: cover; transition: transform .5s var(--ease); }
.kit-card:hover .kit-card-cover { transform: scale(1.035); }
.kit-card-shade { background: linear-gradient(180deg, rgba(5,9,11,.45) 0%, rgba(5,9,11,.05) 48%, rgba(5,9,11,.62) 100%); }
.kit-card.is-locked .kit-card-cover { filter: saturate(.55) brightness(.72); }
.kit-card-media-top { position: absolute; z-index: var(--z-raised); inset: 12px 12px auto; display: flex; align-items: start; justify-content: space-between; gap: 8px; }
.kit-type-pill, .kit-access-badge, .kit-access-lock, .kit-library-toggle {
  min-height: 29px;
  display: inline-flex;
  align-items: center;
  padding: 0 9px;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: var(--r-pill);
  color: #fff;
  background: rgba(8,13,16,.64);
  backdrop-filter: blur(11px);
  font-size: .5em;
  font-weight: 850;
  letter-spacing: .05em;
}
.kit-type-pill { max-width: 58%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.kit-card-media-actions { display: flex; align-items: center; justify-content: flex-end; gap: 6px; min-width: 0; }
.kit-access-badge.free { color: #d7f3ec; }
.kit-access-badge.premium, .kit-access-lock { color: #251d0d; background: rgba(240,207,132,.95); border-color: rgba(255,238,191,.8); }
.kit-library-toggle { position: static; letter-spacing: 0; }
.kit-library-toggle.is-saved { color: #d7f3ec; border-color: rgba(117,205,183,.3); }
.kit-card-media-status { position: absolute; z-index: var(--z-raised); left: 13px; right: 13px; bottom: 11px; display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.kit-card-media-status span { color: rgba(255,255,255,.86); font-size: .53333em; font-weight: 700; text-shadow: 0 1px 5px rgba(0,0,0,.45); }
.kit-card-content { position: relative; padding: 17px 17px 15px; }
.kit-card-title-row { display: grid; grid-template-columns: minmax(0,1fr) 38px; align-items: start; gap: 12px; }
.kit-card-content h3 { color: var(--ink); font-size: clamp(1.26667em,1.5vw,1.6em); line-height: 1.12; }
.kit-card-content p { display: -webkit-box; overflow: hidden; min-height: 42px; margin-top: 9px; color: var(--muted-strong); font-size: .73333em; line-height: 1.5; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }
.kit-card-meta { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.kit-card .meta-chip { color: var(--muted-strong); background: var(--surface-soft); border-color: var(--line); }
.kit-card-footer { margin-top: 14px; padding-top: 13px; border-top: 1px solid var(--line-soft); }
.kit-progress-line { height: 4px; background: var(--track-soft); }
.kit-progress small { display: block; margin-top: 8px; color: var(--muted-strong); font-size: .7em; font-weight: 700; }
.open-kit { width: 38px; min-height: 38px; padding: 0; display: grid; place-items: center; color: #fff; background: var(--ink); border-radius: 12px; font-size: 1em; }











.immersion-toolbar { display: flex; justify-content: space-between; gap: 20px; align-items: center; margin: 22px 0; padding: 16px 18px; background: var(--surface); border: 1px solid var(--line); border-radius: 15px; }
.immersion-toolbar > div { display: grid; }
.immersion-toolbar strong { font-size: .8em; }
.immersion-toolbar > div span { color: var(--muted); font-size: .66667em; }

.catalog-pagination { display: flex; justify-content: space-between; align-items: center; gap: 18px; margin-top: 30px; padding-top: 18px; border-top: 1px solid var(--line); }
.catalog-pagination-summary { color: var(--muted); font-size: .6em; }
.catalog-pagination-controls { display: flex; gap: 5px; }


.music-view, .immersion-page-intro, .progress-page-intro, .workspace-header-v4, .workspace-stage-progress { min-width: 0; }

/* Responsive rules are colocated with their owning component (V9). */
.mobile-shortcut-bar,
.mobile-drawer-tools,
.mobile-shortcut-editor-backdrop {
  display: none;
}

@media (min-width: 901px) {
  .sidebar { padding-right: 260px; }
  .hero { min-height: 340px; }
  .hero-copy { width: min(760px, 68%); padding: 32px 38px; }
  .hero-copy h1 { font-size: clamp(1.93333em, 3.4vw, 2.93333em); }
  .hero-actions { margin-top: 18px; }
}

@media (max-width: 1180px) {
  :root { --sidebar-w: 156px; }
  .kit-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
}

@media (max-width: 900px) {
  .hero-progress-card { display: none; }
  :root { --topbar-h: 62px; }
  .sidebar {
    inset: auto 10px 10px 10px;
    width: auto;
    height: 62px;
    flex-direction: row;
    align-items: center;
    padding: 5px;
    background: rgba(18,26,30,.96);
    border: 1px solid rgba(255,255,255,.08);
    border-radius: 18px;
    box-shadow: 0 18px 46px rgba(10,15,18,.22);
    backdrop-filter: blur(18px);
  }
  .brand, .nav-section-label, .privacy-note { display: none; }
  .main-nav { width: 100%; display: grid; grid-template-columns: repeat(6,1fr); gap: 2px; }
  .nav-item { min-height: 50px; grid-template-columns: 1fr; place-items: center; padding: 4px; color: #d5dfe0; border-radius: 13px; text-align: center; }
  .nav-item:hover, .nav-item.is-active { background: rgba(255,255,255,.09); box-shadow: none; }
  .nav-icon, .nav-item.is-active .nav-icon { width: 28px; height: 28px; color: #d8e3e4; background: transparent; }
  .nav-copy small { display: none; }
  .nav-copy strong { color: inherit; font-size: .5em; }
  .main-area { margin-left: 0; padding-bottom: 82px; }
  .view { width: min(100% - 28px,var(--content-max)); padding-top: 24px; }
  .hero-copy { width: 78%; padding: 34px; }
  .main-nav { grid-template-columns: repeat(6,minmax(0,1fr)); }
  .main-nav > [data-nav="music"] { display: none; }
  :root { --mobile-shortcut-h: 64px; }
  .main-area {
    margin-left: 0;
    padding-top: 0;
    padding-bottom: calc(var(--mobile-shortcut-h) + env(safe-area-inset-bottom, 0px) + 18px);
  }
  .sidebar {
    inset: 0 auto 0 0;
    z-index: var(--z-mobile-drawer);
    width: min(340px, 88vw);
    height: 100dvh;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    padding: max(14px, env(safe-area-inset-top, 0px)) 12px 20px;
    border: 0;
    border-right: 1px solid rgba(255,255,255,.08);
    border-radius: 0;
    box-shadow: 22px 0 56px rgba(7,12,15,.32);
    transform: translateX(-104%);
    transition: transform .22s ease;
  }
  body.menu-open .sidebar { transform: translateX(0); }
  .sidebar .brand {
    width: 100%;
    display: flex;
    padding: 6px 7px 18px;
    border-right: 0;
  }
  .sidebar .privacy-note { display: flex; }
  .sidebar .main-nav {
    width: 100%;
    display: grid;
    grid-template-columns: 1fr;
    gap: 3px;
    overflow-y: auto;
    padding-bottom: 10px;
  }
  .sidebar .nav-section-label { display: block; }
  .sidebar .nav-item {
    min-height: 51px;
    grid-template-columns: 34px minmax(0,1fr);
    place-items: initial;
    align-items: center;
    padding: 7px 9px;
    color: #9fb0b4;
    border-radius: 14px;
    text-align: left;
  }
  .sidebar .nav-item:hover {
    color: #f2f6f6;
    background: rgba(255,255,255,.05);
  }
  .sidebar .nav-item.is-active {
    color: #10201f;
    background: linear-gradient(135deg, #e9c878, #d9ad4a);
  }
  .sidebar .nav-icon,
  .sidebar .nav-item.is-active .nav-icon {
    width: 34px;
    height: 34px;
  }
  .sidebar .nav-copy small { display: block; }
  .sidebar .nav-copy strong { font-size: .7em; }
  .mobile-drawer-tools {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 4px 6px 12px;
    border-bottom: 1px solid rgba(255,255,255,.07);
  }
  .mobile-drawer-tools > strong {
    color: #f5f7f7;
    font-size: .8em;
  }
  .mobile-drawer-tools > div {
    display: flex;
    align-items: center;
    gap: 7px;
  }
  .mobile-edit-shortcuts,
  .mobile-drawer-close {
    min-height: 34px;
    color: #dbe4e5;
    background: rgba(255,255,255,.07);
    border: 1px solid rgba(255,255,255,.07);
    border-radius: 9px;
    font-size: .53333em;
    font-weight: 800;
  }
  .mobile-edit-shortcuts { padding: 0 10px; }
  .mobile-drawer-close {
    width: 34px;
    font-size: 1.33333em;
    line-height: 1;
  }
  .sidebar-scrim {
    position: fixed;
    inset: 0;
    z-index: var(--z-mobile-scrim);
    display: block;
    background: rgba(5,10,12,.58);
    backdrop-filter: blur(3px);
  }
  .sidebar-scrim[hidden] { display: none !important; }
  .mobile-shortcut-bar {
    position: fixed;
    inset: auto 0 0 0;
    z-index: var(--z-mobile-shortcuts);
    width: 100%;
    min-height: calc(var(--mobile-shortcut-h) + env(safe-area-inset-bottom, 0px));
    display: grid;
    grid-template-columns: minmax(0,1fr) 62px;
    align-items: stretch;
    padding: 0 0 env(safe-area-inset-bottom, 0px);
    color: #dce5e6;
    background: rgba(13,24,28,.985);
    border: 0;
    border-top: 1px solid rgba(255,255,255,.08);
    border-radius: 0;
    box-shadow: 0 -12px 32px rgba(5,10,12,.18);
    backdrop-filter: blur(18px);
  }
  .mobile-shortcut-slots {
    min-width: 0;
    display: grid;
    grid-template-columns: repeat(var(--mobile-shortcut-count, 5), minmax(0,1fr));
  }
  .mobile-shortcut,
  .mobile-shortcut-menu-button {
    min-width: 0;
    min-height: var(--mobile-shortcut-h);
    display: grid;
    place-items: center;
    align-content: center;
    gap: 3px;
    padding: 5px 2px;
    color: #9fb0b4;
    background: transparent;
    border: 0;
    border-radius: 0;
    text-align: center;
  }
  .mobile-shortcut:hover,
  .mobile-shortcut-menu-button:hover,
  .mobile-shortcut.is-active {
    color: #f4d57f;
    background: rgba(255,255,255,.055);
  }
  .mobile-shortcut:disabled { opacity: .34; }
  .mobile-shortcut-icon {
    display: grid;
    place-items: center;
    width: 28px;
    height: 28px;
    color: currentColor;
    font-family: var(--font-mono);
    font-size: .73333em;
    font-weight: 850;
  }
  .mobile-shortcut > span:last-child,
  .mobile-shortcut-menu-button > span:last-child {
    width: 100%;
    overflow: hidden;
    font-size: .63333em;
    font-weight: 760;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  .mobile-shortcut.is-active > span:last-child {
    font-size: .8em;
    font-weight: 820;
  }
  .mobile-shortcut-menu-button { border-left: 1px solid rgba(255,255,255,.07); }
  .mobile-hamburger {
    width: 25px;
    height: 25px;
    display: grid;
    place-content: center;
    gap: 4px;
  }
  .mobile-hamburger i {
    display: block;
    width: 20px;
    height: 2px;
    background: currentColor;
    border-radius: 2px;
  }
  .mobile-shortcut-editor-backdrop {
    position: fixed;
    inset: 0;
    z-index: var(--z-mobile-editor);
    display: grid;
    align-items: end;
    padding: 14px;
    background: rgba(5,10,12,.6);
    backdrop-filter: blur(4px);
  }
  .mobile-shortcut-editor-backdrop[hidden] { display: none !important; }
  .mobile-shortcut-editor {
    width: min(100%, 520px);
    max-height: min(78dvh, 680px);
    margin: 0 auto;
    overflow-y: auto;
    padding: 18px;
    color: var(--ink);
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: 0 24px 70px rgba(5,10,12,.3);
  }
  .mobile-shortcut-editor-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
  }
  .mobile-shortcut-editor-head span {
    display: block;
    color: var(--muted);
    font-size: .46667em;
    font-weight: 850;
    letter-spacing: .14em;
  }
  .mobile-shortcut-editor-head strong {
    display: block;
    margin-top: 4px;
    font-size: 1.13333em;
  }
  .mobile-shortcut-editor-head button {
    width: 36px;
    height: 36px;
    color: var(--ink);
    background: var(--surface-soft);
    border: 1px solid var(--line);
    border-radius: 10px;
    font-size: 1.46667em;
  }
  .mobile-shortcut-editor > p {
    margin-top: 7px;
    color: var(--muted-strong);
    font-size: .6em;
    line-height: 1.5;
  }
  .mobile-shortcut-editor-list {
    display: grid;
    gap: 7px;
    margin-top: 14px;
  }
  .mobile-shortcut-choice {
    display: grid;
    grid-template-columns: 26px 34px minmax(0,1fr) auto;
    align-items: center;
    gap: 8px;
    min-height: 48px;
    padding: 7px 9px;
    background: var(--surface-soft);
    border: 1px solid var(--line);
    border-radius: 11px;
  }
  .mobile-shortcut-choice input {
    width: 17px;
    height: 17px;
    accent-color: var(--accent);
  }
  .mobile-shortcut-choice-icon {
    display: grid;
    place-items: center;
    width: 32px;
    height: 32px;
    color: var(--accent-strong);
    background: var(--accent-soft);
    border-radius: 9px;
    font-family: var(--font-mono);
    font-size: .66667em;
    font-weight: 850;
  }
  .mobile-shortcut-choice strong {
    min-width: 0;
    font-size: .66667em;
  }
  .mobile-shortcut-choice small {
    color: var(--muted);
    font-size: .46667em;
  }
  .mobile-shortcut-editor-actions {
    display: grid;
    grid-template-columns: 1fr 1.25fr;
    gap: 8px;
    margin-top: 14px;
  }
  .mobile-shortcut-editor-actions button {
    min-height: 42px;
    border-radius: 11px;
    font-size: .6em;
    font-weight: 800;
  }
  #mobileShortcutEditorCancel {
    color: var(--ink);
    background: var(--surface-soft);
    border: 1px solid var(--line);
  }
  #mobileShortcutEditorSave {
    color: #fff;
    background: var(--accent);
  }
  body.mobile-shortcut-editor-open,
  body.menu-open { overflow: hidden; }
}

@media (max-width: 700px) {
  .page-intro { grid-template-columns: 1fr; gap: 14px; padding-top: 14px; }
  .intro-number { text-align: left; }
  .section-heading { align-items: start; flex-direction: column; gap: 8px; margin-top: 32px; }
  .catalog-heading-note { display: none; }
  .kit-grid { grid-template-columns: 1fr; gap: 13px; }
  .kit-card { border-radius: 17px; }
  .kit-card-content { padding: 15px; }
  .kit-card-content h3 { font-size: 1.4em; }
  .kit-card-content p { min-height: 34px; font-size: .63333em; line-height: 1.55; }
  .kit-progress small { margin-top: 7px; font-size: .6em; }
  .kit-card-media-top { inset: 9px 9px auto; }
  .kit-type-pill, .kit-access-badge, .kit-access-lock, .kit-library-toggle { min-height: 27px; padding: 0 8px; font-size: .46667em; }
  .kit-type-pill { max-width: 48%; }
  .hero { min-height: 156px; border-radius: 16px; }
  .hero-copy { width: 100%; padding: 18px; }
  .hero-copy .eyebrow { font-size: .46667em; letter-spacing: .11em; }
  .hero-copy h1 { max-width: 72%; margin-top: 5px; font-size: 1.33333em; line-height: 1.08; }
  .hero-copy p,
  .hero-meta,
  #openMaterialsButton { display: none; }
  .hero-actions { margin-top: 12px; }
  .hero-actions .primary-button { min-height: 34px; padding: 0 12px; font-size: .6em; }
  .hero-shade { background: linear-gradient(90deg, rgba(8,13,16,.94) 0%, rgba(8,13,16,.76) 48%, rgba(8,13,16,.18) 100%); }
  .immersion-toolbar { align-items: stretch; flex-direction: column; }
  .study-view-meta { justify-content: flex-start; }
  .catalog-pagination { align-items: stretch; flex-direction: column; }
  .catalog-pagination-controls { flex-wrap: wrap; }
}

@media (max-width: 420px) {
  .view { width: calc(100% - 20px); }
  .nav-copy strong { font-size: .45333em; }
  .kit-card-content { padding: 14px; }
  .kit-card-content h3 { font-size: 1.33333em; }
  .kit-card-media-actions .kit-access-badge { display: none; }
}

/* v40: improve desktop card readability and action hierarchy. */
@media (min-width: 901px) {
  .kit-type-pill,
  .kit-access-badge,
  .kit-access-lock {
    font-size: .66667em;
  }

  .kit-library-toggle {
    min-height: 34px;
    padding-inline: 12px;
    border-color: rgba(255,255,255,.34);
    background: rgba(8,13,16,.88);
    box-shadow: 0 6px 16px rgba(0,0,0,.16);
    font-size: .73333em;
    font-weight: 900;
  }

  .kit-library-toggle:hover {
    border-color: rgba(255,255,255,.58);
    background: rgba(18,29,34,.96);
  }

  .kit-card.is-collection-card .kit-card-content p {
    font-size: .86667em;
    line-height: 1.52;
  }
}