body.study-page {
  --hub-bg: #00030a;
  --hub-panel: rgba(4, 12, 28, 0.82);
  --hub-panel-strong: rgba(6, 16, 36, 0.94);
  --hub-line: rgba(119, 151, 255, 0.24);
  --hub-line-strong: rgba(103, 223, 255, 0.46);
  --hub-muted: #aeb9d2;
  min-width: 320px;
  background:
    radial-gradient(circle at 48% -8%, rgba(83, 118, 255, 0.18), transparent 28%),
    radial-gradient(circle at 92% 12%, rgba(103, 223, 255, 0.08), transparent 24%),
    linear-gradient(180deg, #000206 0%, #01040b 50%, #000103 100%);
}

body.study-page::before {
  background:
    linear-gradient(rgba(93, 124, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(93, 124, 255, 0.032) 1px, transparent 1px);
  background-size: 74px 74px;
}

.hub-shell {
  width: min(100%, 1740px);
  margin: 0 auto;
  padding: 14px 24px 42px;
}

.hub-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.hub-sidebar,
.hub-card,
.hub-link-card,
.hub-table-card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--hub-line);
  border-radius: 10px;
  background:
    linear-gradient(135deg, rgba(10, 24, 53, 0.82), rgba(1, 5, 15, 0.94)),
    var(--hub-panel);
  box-shadow:
    0 26px 80px rgba(0, 0, 0, 0.34),
    inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

.hub-card::before,
.hub-link-card::before,
.hub-sidebar::before {
  position: absolute;
  inset: 0;
  pointer-events: none;
  content: "";
  background:
    radial-gradient(circle at var(--mx, 50%) var(--my, 0%), rgba(93, 124, 255, 0.16), transparent 38%),
    linear-gradient(135deg, rgba(103, 223, 255, 0.04), transparent 42%);
  opacity: 0.9;
}

.hub-sidebar {
  position: sticky;
  top: 72px;
  min-height: calc(100vh - 100px);
  padding: 20px;
}

.hub-sidebar > * {
  position: relative;
  z-index: 1;
}

.hub-logo,
.hub-profile {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 12px;
  align-items: center;
}

.hub-logo {
  margin-bottom: 22px;
}

.hub-mark,
.hub-nav-icon,
.hub-mini-icon {
  display: grid;
  place-items: center;
  border-radius: 10px;
  color: var(--cyan);
  background: rgba(93, 124, 255, 0.13);
  box-shadow: inset 0 0 18px rgba(93, 124, 255, 0.14);
}

.hub-mark {
  width: 42px;
  height: 42px;
  border: 1px solid rgba(93, 124, 255, 0.48);
  font-size: 1.15rem;
}

.hub-logo strong,
.hub-profile strong {
  display: block;
  color: var(--text);
  font-size: 0.98rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hub-logo span,
.hub-profile span,
.hub-kicker,
.hub-chip {
  color: #8495c8;
  font-size: 0.68rem;
  font-weight: 850;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hub-nav {
  display: grid;
  gap: 8px;
}

.hub-nav a,
.hub-button,
.hub-link-card,
.hub-table-card,
.note-card,
.subject-card,
.tool-card {
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.hub-nav a {
  display: grid;
  grid-template-columns: 30px 1fr auto;
  gap: 10px;
  align-items: center;
  min-height: 44px;
  padding: 0 10px;
  border: 1px solid transparent;
  border-radius: 9px;
  color: #dce5fb;
  font-size: 0.9rem;
}

.hub-nav a:hover,
.hub-nav a.active,
.hub-button:hover,
.hub-link-card:hover,
.hub-table-card:hover,
.note-card:hover,
.subject-card:hover,
.tool-card:hover {
  border-color: var(--hub-line-strong);
  box-shadow: 0 0 30px rgba(93, 124, 255, 0.22);
  transform: translateY(-3px);
}

.hub-nav a:hover,
.hub-nav a.active {
  background: linear-gradient(135deg, rgba(44, 80, 230, 0.78), rgba(10, 30, 92, 0.76));
  transform: translateX(3px);
}

.hub-nav-icon,
.hub-mini-icon {
  width: 30px;
  height: 30px;
  color: var(--blue-2);
}

.hub-sidebar-panel,
.hub-profile {
  margin-top: 18px;
  padding: 16px;
  border: 1px solid rgba(122, 156, 255, 0.16);
  border-radius: 10px;
  background: rgba(2, 8, 21, 0.66);
}

.hub-profile img {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid rgba(93, 124, 255, 0.44);
}

.streak-value {
  margin-top: 8px;
  color: #fff;
  font-size: 1.85rem;
  font-weight: 850;
}

.week-bars {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 6px;
  align-items: end;
  height: 42px;
  margin-top: 12px;
}

.week-bars span {
  min-height: 7px;
  border-radius: 999px 999px 3px 3px;
  background: linear-gradient(180deg, var(--cyan), var(--blue));
}

.owner-status {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.hub-main {
  display: grid;
  gap: 18px;
}

.hub-card {
  padding: 22px;
}

.hub-card > *,
.hub-link-card > *,
.hub-table-card > * {
  position: relative;
  z-index: 1;
}

.hub-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(380px, 0.88fr);
  gap: 28px;
  align-items: center;
  min-height: 360px;
  padding: clamp(24px, 3vw, 38px);
}

.hub-hero h1,
.page-title h1 {
  margin: 12px 0;
  font-size: clamp(2.15rem, 3.8vw, 4.25rem);
  line-height: 1.04;
}

.hub-hero p,
.page-title p,
.hub-card p,
.hub-link-card p,
.note-card p,
.subject-card p,
.tool-card p {
  color: var(--hub-muted);
  line-height: 1.58;
}

.visual-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(93, 124, 255, 0.18);
  border-radius: 10px;
  background: #020611;
}

.visual-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.9;
}

.visual-frame::after {
  position: absolute;
  inset: 0;
  content: "";
  background:
    radial-gradient(circle at 76% 30%, rgba(103, 223, 255, 0.22), transparent 28%),
    linear-gradient(180deg, transparent, rgba(1, 4, 12, 0.42));
  pointer-events: none;
}

.hero-visual {
  aspect-ratio: 16 / 9;
  box-shadow: 0 0 50px rgba(93, 124, 255, 0.13);
}

.hub-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.hub-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid rgba(93, 124, 255, 0.38);
  border-radius: 9px;
  color: #dce5ff;
  font-size: 0.82rem;
  font-weight: 850;
  background: rgba(4, 13, 34, 0.72);
  cursor: pointer;
}

.hub-button.primary {
  border-color: rgba(93, 124, 255, 0.72);
  background: linear-gradient(135deg, #5d57ff, #1b60ff);
  color: #fff;
  box-shadow: 0 0 24px rgba(74, 106, 255, 0.22);
}

.hub-button.danger {
  border-color: rgba(255, 91, 107, 0.45);
  color: #ff9aa5;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.stat-card {
  min-height: 136px;
}

.stat-top {
  display: flex;
  align-items: center;
  gap: 10px;
}

.stat-value {
  margin-top: 12px;
  color: #fff;
  font-size: 1.8rem;
  font-weight: 850;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.hub-link-card {
  display: flex;
  min-height: 318px;
  padding: 14px;
  flex-direction: column;
  cursor: pointer;
}

.card-visual {
  height: 150px;
  margin-bottom: 16px;
}

.hub-link-card h2,
.subject-card h2,
.note-card h2,
.tool-card h2 {
  margin: 0 0 8px;
  font-size: 1.18rem;
}

.card-footer {
  display: flex;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 16px;
  color: #95a9ff;
  font-size: 0.8rem;
  font-weight: 850;
}

.split-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(340px, 0.9fr);
  gap: 18px;
}

.card-head {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: center;
  margin-bottom: 16px;
}

.subject-grid,
.note-grid,
.tool-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.subject-card,
.note-card,
.tool-card {
  display: grid;
  gap: 13px;
  padding: 16px;
  border: 1px solid rgba(122, 156, 255, 0.2);
  border-radius: 10px;
  background: rgba(2, 8, 21, 0.68);
  cursor: pointer;
}

.subject-card .visual-frame,
.note-card .visual-frame,
.tool-card .visual-frame {
  aspect-ratio: 16 / 9;
}

.progress-track {
  height: 5px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(93, 124, 255, 0.14);
}

.progress-track span {
  display: block;
  width: var(--p, 50%);
  height: 100%;
  border-radius: inherit;
  background: var(--c, linear-gradient(90deg, var(--blue), var(--cyan)));
  box-shadow: 0 0 16px rgba(93, 124, 255, 0.45);
}

.filter-row {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) repeat(2, minmax(160px, 220px));
  gap: 12px;
  margin-bottom: 16px;
}

.hub-input,
.hub-select,
.hub-textarea {
  width: 100%;
  min-height: 42px;
  border: 1px solid rgba(122, 156, 255, 0.2);
  border-radius: 9px;
  color: #eef3ff;
  background: rgba(2, 8, 21, 0.72);
  font: inherit;
  padding: 0 13px;
}

.hub-textarea {
  min-height: 110px;
  padding-top: 12px;
  resize: vertical;
}

.hub-input::placeholder,
.hub-textarea::placeholder {
  color: #7f8fb9;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.hub-chip {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 0 8px;
  border: 1px solid rgba(103, 223, 255, 0.18);
  border-radius: 999px;
  color: var(--cyan);
  background: rgba(5, 216, 255, 0.08);
}

.flashcard-stage {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.38fr);
  gap: 18px;
}

.flashcard-viewer {
  min-height: 360px;
  display: grid;
  place-items: center;
  padding: 22px;
  cursor: pointer;
  text-align: center;
  background:
    radial-gradient(circle at 25% 30%, rgba(93, 124, 255, 0.22), transparent 32%),
    linear-gradient(135deg, rgba(7, 18, 40, 0.9), rgba(2, 6, 16, 0.96));
}

.flashcard-viewer h2 {
  max-width: 720px;
  font-size: clamp(1.6rem, 3vw, 2.7rem);
  line-height: 1.18;
}

.flashcard-viewer.is-flipped {
  border-color: rgba(37, 224, 182, 0.55);
  box-shadow: 0 22px 70px rgba(37, 224, 182, 0.16), inset 0 0 44px rgba(93, 124, 255, 0.12);
  background:
    radial-gradient(circle at 70% 35%, rgba(37, 224, 182, 0.2), transparent 36%),
    linear-gradient(135deg, rgba(6, 30, 44, 0.92), rgba(2, 6, 16, 0.96));
}

.flash-meta {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 16px;
}

.owner-only {
  display: none !important;
}

body.owner-mode .owner-only {
  display: revert !important;
}

body.owner-mode .owner-grid {
  display: grid !important;
}

.owner-grid {
  display: none;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 18px;
}

.owner-form {
  display: grid;
  gap: 12px;
}

.owner-list {
  display: grid;
  gap: 10px;
  max-height: 520px;
  overflow: auto;
  padding-right: 4px;
}

.owner-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 12px;
  border: 1px solid rgba(122, 156, 255, 0.16);
  border-radius: 9px;
  background: rgba(2, 8, 21, 0.64);
}

.planner-grid,
.progress-grid,
.goals-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 8px;
}

.calendar-grid span,
.goal-item {
  min-height: 48px;
  border: 1px solid rgba(122, 156, 255, 0.16);
  border-radius: 9px;
  background: rgba(2, 8, 21, 0.66);
}

.calendar-grid span {
  display: grid;
  place-items: center;
}

.calendar-grid .active {
  border-color: rgba(93, 124, 255, 0.62);
  color: #fff;
  background: linear-gradient(135deg, #5d57ff, #1b60ff);
}

.goal-item {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 12px;
}

.chart-bars {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 10px;
  align-items: end;
  min-height: 190px;
}

.chart-bars span {
  display: block;
  min-height: 24px;
  border-radius: 9px 9px 3px 3px;
  background: linear-gradient(180deg, var(--cyan), var(--blue));
  box-shadow: 0 0 18px rgba(93, 124, 255, 0.22);
}

@media (max-width: 1280px) {
  .hub-layout {
    grid-template-columns: 230px minmax(0, 1fr);
  }

  .dashboard-grid,
  .subject-grid,
  .note-grid,
  .tool-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hub-hero,
  .split-grid,
  .flashcard-stage,
  .owner-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 920px) {
  .hub-layout {
    grid-template-columns: 1fr;
  }

  .hub-sidebar {
    position: static;
    min-height: auto;
  }

  .hub-nav {
    grid-template-columns: repeat(2, 1fr);
  }

  .stats-grid,
  .planner-grid,
  .progress-grid,
  .goals-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .filter-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .hub-shell {
    padding: 14px;
  }

  .hub-nav,
  .dashboard-grid,
  .subject-grid,
  .note-grid,
  .tool-grid,
  .stats-grid,
  .planner-grid,
  .progress-grid,
  .goals-grid {
    grid-template-columns: 1fr;
  }

  .hub-card,
  .hub-link-card {
    padding: 16px;
  }

  .card-head {
    align-items: flex-start;
    flex-direction: column;
  }
}

body.study-clean-page {
  background:
    radial-gradient(circle at 46% 2%, rgba(18, 105, 255, 0.18), transparent 28%),
    radial-gradient(circle at 84% 8%, rgba(103, 223, 255, 0.08), transparent 24%),
    linear-gradient(180deg, #000206 0%, #020711 48%, #000205 100%);
}

.study-clean-shell {
  width: min(100%, 1580px);
}

.study-clean-main {
  padding: clamp(34px, 5vw, 68px) clamp(16px, 4vw, 54px) 52px;
}

.study-clean-intro {
  max-width: 720px;
  margin-bottom: 28px;
}

.study-clean-intro h1 {
  margin: 10px 0 16px;
  color: #f7f9ff;
  font-size: clamp(3.3rem, 6vw, 5.7rem);
  line-height: 0.96;
  letter-spacing: 0;
}

.study-clean-intro h1 span {
  color: var(--blue);
}

.study-clean-intro p:last-child {
  max-width: 620px;
  margin: 0;
  color: #c1ccdc;
  font-size: clamp(1rem, 1.5vw, 1.16rem);
  line-height: 1.72;
}

.study-app-shell {
  position: relative;
  display: grid;
  grid-template-columns: 235px minmax(0, 1fr);
  min-height: clamp(560px, 58vw, 760px);
  overflow: hidden;
  border: 1px solid rgba(31, 119, 255, 0.78);
  border-radius: 28px;
  background:
    radial-gradient(circle at 54% -12%, rgba(80, 135, 255, 0.23), transparent 38%),
    linear-gradient(135deg, rgba(12, 27, 58, 0.88), rgba(1, 6, 17, 0.98));
  box-shadow:
    0 0 0 1px rgba(128, 178, 255, 0.08),
    0 0 58px rgba(18, 105, 255, 0.28),
    0 34px 110px rgba(0, 0, 0, 0.42),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.study-app-shell::before {
  position: absolute;
  inset: 0;
  content: "";
  pointer-events: none;
  background:
    linear-gradient(rgba(93, 124, 255, 0.034) 1px, transparent 1px),
    linear-gradient(90deg, rgba(93, 124, 255, 0.026) 1px, transparent 1px);
  background-size: 58px 58px;
  mask-image: linear-gradient(90deg, #000, transparent 92%);
}

.study-app-sidebar,
.study-app-screen,
.study-feature-strip {
  position: relative;
  z-index: 1;
}

.study-app-sidebar {
  display: grid;
  grid-template-rows: auto 1fr auto auto;
  gap: 22px;
  padding: 38px 24px 28px;
  border-right: 1px solid rgba(111, 153, 255, 0.12);
  background: linear-gradient(180deg, rgba(4, 13, 30, 0.96), rgba(1, 6, 17, 0.92));
}

.study-app-logo,
.study-app-user {
  display: flex;
  gap: 12px;
  align-items: center;
  color: #fff;
}

.study-app-logo span,
.study-app-user span {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  color: #68d7ff;
  background: rgba(18, 105, 255, 0.14);
  font-size: 0.64rem;
  font-weight: 950;
  letter-spacing: 0.05em;
  box-shadow: inset 0 0 18px rgba(18, 105, 255, 0.16);
}

.study-app-logo strong {
  font-size: 1rem;
}

.study-app-sidebar nav {
  display: grid;
  gap: 8px;
}

.study-app-sidebar nav a {
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 10px;
  align-items: center;
  min-height: 42px;
  padding: 0 12px;
  border: 1px solid transparent;
  border-radius: 9px;
  color: #c9d3e7;
  font-size: 0.9rem;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease, box-shadow 160ms ease;
}

.study-app-sidebar nav a span {
  color: #5b93ff;
  font-size: 0.66rem;
  font-weight: 900;
}

.study-app-sidebar nav a:hover,
.study-app-sidebar nav a.active {
  color: #fff;
  border-color: rgba(50, 125, 255, 0.38);
  background: linear-gradient(135deg, rgba(18, 105, 255, 0.82), rgba(6, 37, 105, 0.82));
  box-shadow: 0 0 26px rgba(18, 105, 255, 0.18);
  transform: translateX(3px);
}

.study-owner-toggle {
  min-height: 42px;
  border: 1px solid rgba(93, 124, 255, 0.32);
  border-radius: 9px;
  color: #dfe8ff;
  background: rgba(2, 9, 24, 0.74);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 850;
  cursor: pointer;
}

.study-app-user {
  padding-top: 18px;
  border-top: 1px solid rgba(111, 153, 255, 0.12);
}

.study-app-user span {
  color: #fff;
  background: #1269ff;
  border-radius: 50%;
}

.study-app-user small {
  color: #94a2ba;
  font-size: 0.72rem;
  line-height: 1.4;
}

.study-app-screen {
  padding: clamp(30px, 4vw, 52px);
}

.study-app-topbar {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: start;
  margin-bottom: 30px;
}

.study-app-topbar h2 {
  margin: 0 0 6px;
  color: #fff;
  font-size: clamp(1.45rem, 2vw, 2rem);
}

.study-app-topbar p {
  margin: 0;
  color: #8e9bb1;
}

.study-app-tools {
  display: flex;
  gap: 12px;
  align-items: center;
}

.study-app-search {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: min(260px, 26vw);
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid rgba(116, 151, 255, 0.2);
  border-radius: 11px;
  background: rgba(0, 4, 13, 0.66);
}

.study-app-search span {
  width: 11px;
  height: 11px;
  border: 2px solid #8191ad;
  border-radius: 50%;
}

.study-app-search input {
  width: 100%;
  border: 0;
  color: #eaf0ff;
  background: transparent;
  font: inherit;
  font-size: 0.86rem;
  outline: 0;
}

.study-app-search input::placeholder {
  color: #74839d;
}

.study-icon-button {
  width: 44px;
  height: 44px;
  border: 1px solid rgba(116, 151, 255, 0.2);
  border-radius: 11px;
  color: #ffe083;
  background: rgba(0, 4, 13, 0.66);
  font-weight: 900;
}

.study-subject-cards {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-bottom: 22px;
}

.study-stat-card,
.study-streak-card,
.study-goals-panel,
.study-progress-panel {
  border: 1px solid rgba(105, 137, 210, 0.12);
  border-radius: 14px;
  background:
    radial-gradient(circle at 85% 12%, rgba(18, 105, 255, 0.12), transparent 34%),
    rgba(5, 15, 32, 0.84);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.26);
}

.study-stat-card,
.study-streak-card {
  display: grid;
  gap: 12px;
  min-height: 126px;
  padding: 18px;
  color: #fff;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.study-stat-card:hover,
.study-streak-card:hover,
.study-goals-panel a:hover {
  border-color: rgba(71, 154, 255, 0.42);
  box-shadow: 0 0 28px rgba(18, 105, 255, 0.16);
  transform: translateY(-2px);
}

.study-stat-card span {
  color: #1687ff;
  font-size: 0.72rem;
  font-weight: 950;
}

.study-stat-card.biology span {
  color: #39d783;
}

.study-stat-card strong,
.study-streak-card strong {
  font-size: 1rem;
}

.study-stat-card small {
  display: flex;
  justify-content: space-between;
  color: #a9b5c8;
}

.study-stat-card b {
  color: #ffd45d;
}

.study-stat-card i,
.study-goals-panel i {
  display: block;
  width: 100%;
  height: 5px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(83, 107, 158, 0.32);
}

.study-stat-card i::before,
.study-goals-panel i::before {
  display: block;
  width: var(--p);
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #1269ff, #7bcaff);
  content: "";
}

.study-streak-card em {
  color: #45d37d;
  font-size: 3.2rem;
  font-style: normal;
  line-height: 0.9;
}

.study-streak-card small {
  color: #9ba8bd;
}

.study-dashboard-bottom {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 0.4fr);
  gap: 22px;
}

.study-goals-panel,
.study-progress-panel {
  padding: 22px;
}

.study-panel-head {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: center;
  margin-bottom: 14px;
}

.study-panel-head h3 {
  margin: 0;
  color: #fff;
  font-size: 1rem;
}

.study-panel-head a {
  color: #5ca1ff;
  font-size: 0.78rem;
  font-weight: 850;
}

.study-goals-panel > a {
  display: grid;
  grid-template-columns: 24px 1fr 46px 124px;
  gap: 14px;
  align-items: center;
  padding: 16px 0;
  border-top: 1px solid rgba(105, 137, 210, 0.1);
  color: inherit;
  transition: transform 160ms ease;
}

.study-goals-panel > a > span {
  width: 17px;
  height: 17px;
  border: 1px solid rgba(255, 212, 93, 0.58);
  border-radius: 50%;
  box-shadow: 0 0 12px rgba(255, 212, 93, 0.18);
}

.study-goals-panel p {
  margin: 0;
  color: #fff;
}

.study-goals-panel small {
  display: block;
  margin-top: 4px;
  color: #8390a8;
  font-size: 0.78rem;
}

.study-goals-panel b {
  color: #dbe8ff;
  font-size: 0.8rem;
}

.study-progress-panel svg {
  width: 100%;
  min-height: 230px;
}

.study-progress-panel .area {
  fill: url(#studyChartFill);
}

.study-progress-panel .line {
  fill: none;
  stroke: #1269ff;
  stroke-width: 5;
  stroke-linecap: round;
  stroke-linejoin: round;
  filter: drop-shadow(0 0 10px rgba(18, 105, 255, 0.6));
}

.study-progress-panel circle {
  fill: #1269ff;
  filter: drop-shadow(0 0 8px rgba(18, 105, 255, 0.72));
}

.study-week-labels {
  display: flex;
  justify-content: space-between;
  color: #8794ab;
  font-size: 0.74rem;
}

.study-feature-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 34px;
}

.study-feature-strip a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  border: 1px solid rgba(93, 124, 255, 0.26);
  border-radius: 9px;
  color: #e8eefb;
  background: rgba(2, 8, 20, 0.7);
  box-shadow: inset 0 0 18px rgba(19, 105, 255, 0.08);
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.study-feature-strip a:hover {
  border-color: rgba(93, 173, 255, 0.52);
  box-shadow: 0 0 28px rgba(18, 105, 255, 0.18);
  transform: translateY(-2px);
}

@media (max-width: 1120px) {
  .study-app-shell {
    grid-template-columns: 1fr;
  }

  .study-app-sidebar {
    grid-template-rows: auto auto auto;
    border-right: 0;
    border-bottom: 1px solid rgba(111, 153, 255, 0.12);
  }

  .study-app-sidebar nav {
    grid-template-columns: repeat(4, 1fr);
  }

  .study-app-user {
    display: none;
  }

  .study-dashboard-bottom {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 820px) {
  .study-clean-main {
    padding-right: 14px;
    padding-left: 14px;
  }

  .study-app-sidebar nav,
  .study-subject-cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .study-app-topbar {
    align-items: stretch;
    flex-direction: column;
  }

  .study-app-tools,
  .study-app-search {
    width: 100%;
  }

  .study-goals-panel > a {
    grid-template-columns: 24px 1fr 46px;
  }

  .study-goals-panel i {
    grid-column: 2 / -1;
  }
}

@media (max-width: 560px) {
  .study-clean-intro h1 {
    font-size: clamp(3rem, 18vw, 4.4rem);
  }

  .study-app-shell {
    border-radius: 18px;
  }

  .study-app-sidebar,
  .study-app-screen {
    padding: 22px 16px;
  }

  .study-app-sidebar nav,
  .study-subject-cards,
  .study-feature-strip {
    grid-template-columns: 1fr;
  }

  .study-feature-strip a {
    width: 100%;
  }
}

/* Full-page Study Hub dashboard */
.study-clean-shell {
  width: min(100%, var(--max));
  padding: 0 24px 34px;
}

.study-clean-main {
  padding: 0;
}

.study-clean-intro,
.study-feature-strip {
  display: none;
}

.study-app-shell {
  grid-template-columns: 270px minmax(0, 1fr);
  min-height: calc(100vh - 86px);
  border: 0;
  border-radius: 0 0 18px 18px;
  background:
    radial-gradient(circle at 46% 0%, rgba(18, 105, 255, 0.16), transparent 34%),
    radial-gradient(circle at 88% 16%, rgba(103, 223, 255, 0.06), transparent 28%),
    linear-gradient(135deg, rgba(2, 8, 18, 0.98), rgba(0, 3, 10, 0.98));
  box-shadow: none;
}

.study-app-shell::before {
  background:
    linear-gradient(rgba(93, 124, 255, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(93, 124, 255, 0.022) 1px, transparent 1px);
  background-size: 76px 76px;
  opacity: 0.8;
  mask-image: linear-gradient(90deg, #000 0 86%, transparent 100%);
}

.study-app-sidebar {
  gap: 24px;
  padding: 38px 26px 28px;
  background:
    radial-gradient(circle at 50% 0%, rgba(18, 105, 255, 0.08), transparent 34%),
    linear-gradient(180deg, rgba(3, 11, 25, 0.98), rgba(1, 5, 14, 0.95));
}

.study-app-logo span {
  color: #0e7dff;
  background: transparent;
  box-shadow: none;
  font-size: 0.68rem;
}

.study-app-sidebar nav a {
  min-height: 48px;
  padding: 0 14px;
  color: #cfd7e8;
}

.study-app-sidebar nav a.active {
  box-shadow: inset 3px 0 0 #1269ff, 0 0 26px rgba(18, 105, 255, 0.12);
}

.study-owner-toggle {
  min-height: 34px;
  justify-self: start;
  padding: 0 14px;
  opacity: 0.62;
}

.study-app-screen {
  padding: clamp(34px, 4.2vw, 58px);
}

.study-app-topbar {
  margin-bottom: 34px;
}

.study-app-topbar h2 {
  font-size: clamp(1.55rem, 2.2vw, 2.1rem);
}

.study-app-search,
.study-icon-button {
  background: rgba(0, 4, 13, 0.58);
}

.study-subject-cards {
  gap: 22px;
  margin-bottom: 28px;
}

.study-stat-card,
.study-streak-card,
.study-goals-panel,
.study-progress-panel {
  border-color: rgba(105, 137, 210, 0.08);
  background:
    radial-gradient(circle at 82% 12%, rgba(18, 105, 255, 0.08), transparent 34%),
    rgba(5, 15, 32, 0.64);
  box-shadow: none;
}

.study-dashboard-bottom {
  grid-template-columns: minmax(0, 1.24fr) minmax(280px, 0.48fr);
  gap: 26px;
}

.study-goals-panel,
.study-progress-panel {
  padding: 24px;
}

@media (max-width: 1120px) {
  .study-clean-shell {
    padding-right: 18px;
    padding-left: 18px;
  }

  .study-app-shell {
    grid-template-columns: 1fr;
    border-radius: 0 0 16px 16px;
  }
}

@media (max-width: 820px) {
  .study-clean-main {
    padding-right: 0;
    padding-left: 0;
  }

  .study-app-screen {
    padding: 28px 18px;
  }
}

/* Matching Study Hub tab pages */
body.study-tab-page {
  background:
    radial-gradient(circle at 46% 2%, rgba(18, 105, 255, 0.15), transparent 30%),
    radial-gradient(circle at 88% 12%, rgba(103, 223, 255, 0.06), transparent 24%),
    linear-gradient(180deg, #000206 0%, #020711 48%, #000205 100%);
}

.study-tab-page .hub-shell {
  width: min(100%, var(--max));
  padding: 0 24px 34px;
}

.study-tab-page .hub-layout {
  position: relative;
  display: grid;
  grid-template-columns: 270px minmax(0, 1fr);
  gap: 0;
  min-height: calc(100vh - 86px);
  overflow: hidden;
  border-radius: 0 0 18px 18px;
  background:
    radial-gradient(circle at 46% 0%, rgba(18, 105, 255, 0.14), transparent 34%),
    radial-gradient(circle at 88% 16%, rgba(103, 223, 255, 0.055), transparent 28%),
    linear-gradient(135deg, rgba(2, 8, 18, 0.98), rgba(0, 3, 10, 0.98));
}

.study-tab-page .hub-layout::before {
  position: absolute;
  inset: 0;
  content: "";
  pointer-events: none;
  background:
    linear-gradient(rgba(93, 124, 255, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(93, 124, 255, 0.022) 1px, transparent 1px);
  background-size: 76px 76px;
  opacity: 0.78;
  mask-image: linear-gradient(90deg, #000 0 86%, transparent 100%);
}

.study-tab-page .hub-sidebar {
  position: relative;
  top: auto;
  z-index: 1;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 24px;
  min-height: auto;
  padding: 38px 26px 28px;
  border: 0;
  border-right: 1px solid rgba(111, 153, 255, 0.12);
  border-radius: 0;
  background:
    radial-gradient(circle at 50% 0%, rgba(18, 105, 255, 0.08), transparent 34%),
    linear-gradient(180deg, rgba(3, 11, 25, 0.98), rgba(1, 5, 14, 0.95));
  box-shadow: none;
}

.study-tab-page .hub-sidebar::before,
.study-tab-page .hub-card.hub-hero::before {
  display: none;
}

.study-tab-page .hub-logo {
  grid-template-columns: 34px 1fr;
  gap: 12px;
  margin-bottom: 0;
}

.study-tab-page .hub-mark {
  width: 34px;
  height: 34px;
  border: 0;
  color: #0e7dff;
  background: transparent;
  box-shadow: none;
  font-size: 0.9rem;
}

.study-tab-page .hub-logo strong {
  color: #fff;
  font-size: 1rem;
  letter-spacing: 0;
  text-transform: none;
}

.study-tab-page .hub-logo > span > span {
  display: none;
}

.study-tab-page .hub-nav {
  gap: 8px;
  align-content: start;
}

.study-tab-page .hub-nav a {
  grid-template-columns: 30px 1fr;
  min-height: 48px;
  padding: 0 14px;
  color: #cfd7e8;
  font-size: 0.94rem;
}

.study-tab-page .hub-nav a > span:last-child:not(.hub-nav-icon) {
  display: none;
}

.study-tab-page .hub-nav-icon {
  color: #5b93ff;
  background: transparent;
  box-shadow: none;
}

.study-tab-page .hub-nav a:hover,
.study-tab-page .hub-nav a.active {
  color: #fff;
  border-color: rgba(50, 125, 255, 0.38);
  background: linear-gradient(135deg, rgba(18, 105, 255, 0.82), rgba(6, 37, 105, 0.82));
  box-shadow: inset 3px 0 0 #1269ff, 0 0 26px rgba(18, 105, 255, 0.12);
  transform: translateX(3px);
}

.study-tab-page .hub-sidebar-panel {
  margin-top: 0;
  padding: 16px 0 0;
  border: 0;
  border-top: 1px solid rgba(111, 153, 255, 0.12);
  border-radius: 0;
  background: transparent;
}

.study-tab-page .owner-status {
  align-items: center;
}

.study-tab-page .hub-sidebar-panel .hub-button {
  min-height: 34px;
  padding: 0 14px;
  opacity: 0.68;
}

.study-tab-page .hub-main {
  position: relative;
  z-index: 1;
  display: grid;
  align-content: start;
  gap: 22px;
  padding: clamp(34px, 4.2vw, 58px);
}

.study-tab-page .hub-hero {
  display: block;
  min-height: auto;
  padding: 0 0 6px;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.study-tab-page .hub-hero .hero-visual {
  display: none;
}

.study-tab-page .hub-hero h1 {
  max-width: 780px;
  margin: 8px 0 10px;
  color: #fff;
  font-size: clamp(2.1rem, 3.6vw, 3.35rem);
  line-height: 1.05;
}

.study-tab-page .hub-hero p {
  max-width: 760px;
  margin: 0;
  color: #aab6ca;
}

.study-tab-page .hub-card,
.study-tab-page .hub-link-card,
.study-tab-page .hub-table-card,
.study-tab-page .subject-card,
.study-tab-page .note-card,
.study-tab-page .tool-card {
  border-color: rgba(105, 137, 210, 0.12);
  border-radius: 14px;
  background:
    radial-gradient(circle at 85% 12%, rgba(18, 105, 255, 0.1), transparent 34%),
    rgba(5, 15, 32, 0.7);
  box-shadow: none;
}

.study-tab-page .hub-card:hover,
.study-tab-page .subject-card:hover,
.study-tab-page .note-card:hover,
.study-tab-page .tool-card:hover {
  border-color: rgba(71, 154, 255, 0.42);
  box-shadow: 0 0 28px rgba(18, 105, 255, 0.14);
}

.study-tab-page .filter-row {
  grid-template-columns: minmax(220px, 1fr) minmax(160px, 220px) minmax(160px, 220px);
}

.study-tab-page .hub-input,
.study-tab-page .hub-select,
.study-tab-page .hub-textarea {
  border-color: rgba(116, 151, 255, 0.2);
  background: rgba(0, 4, 13, 0.66);
}

.study-tab-page .flashcard-viewer {
  min-height: 400px;
}

.study-tab-page .planner-grid,
.study-tab-page .progress-grid,
.study-tab-page .goals-grid,
.study-tab-page .tool-grid,
.study-tab-page .stats-grid {
  gap: 18px;
}

@media (max-width: 1120px) {
  .study-tab-page .hub-shell {
    padding-right: 18px;
    padding-left: 18px;
  }

  .study-tab-page .hub-layout {
    grid-template-columns: 1fr;
  }

  .study-tab-page .hub-sidebar {
    grid-template-rows: auto auto auto;
    border-right: 0;
    border-bottom: 1px solid rgba(111, 153, 255, 0.12);
  }

  .study-tab-page .hub-nav {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Public Study Hub coming soon */
body.study-coming-page {
  min-height: 100vh;
  background:
    radial-gradient(circle at 78% 12%, rgba(18, 105, 255, 0.16), transparent 30%),
    radial-gradient(circle at 28% 84%, rgba(93, 87, 255, 0.12), transparent 28%),
    linear-gradient(180deg, #000206 0%, #020711 48%, #000205 100%);
}

.study-coming-main {
  min-height: calc(100vh - 86px);
  display: grid;
  align-items: center;
  padding: clamp(34px, 5vw, 72px) 0;
}

.study-coming-card {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(360px, 0.68fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
  min-height: min(620px, calc(100vh - 150px));
  overflow: hidden;
  border: 1px solid rgba(105, 137, 210, 0.14);
  border-radius: 20px;
  padding: clamp(28px, 5vw, 72px);
  background:
    radial-gradient(circle at 82% 12%, rgba(18, 105, 255, 0.14), transparent 34%),
    radial-gradient(circle at 30% 92%, rgba(103, 223, 255, 0.08), transparent 34%),
    rgba(5, 15, 32, 0.68);
}

.study-coming-card::before {
  position: absolute;
  inset: 0;
  content: "";
  pointer-events: none;
  background:
    linear-gradient(rgba(93, 124, 255, 0.032) 1px, transparent 1px),
    linear-gradient(90deg, rgba(93, 124, 255, 0.024) 1px, transparent 1px);
  background-size: 76px 76px;
  mask-image: linear-gradient(90deg, #000 0 78%, transparent 100%);
}

.study-coming-copy,
.study-coming-preview {
  position: relative;
  z-index: 1;
}

.study-coming-copy h1 {
  margin: 10px 0 18px;
  color: #f7f9ff;
  font-size: clamp(4rem, 10vw, 8.6rem);
  line-height: 0.9;
  letter-spacing: 0;
}

.study-coming-copy p {
  max-width: 620px;
  margin: 0;
  color: #b7c2d6;
  font-size: clamp(1rem, 1.6vw, 1.22rem);
  line-height: 1.7;
}

.study-coming-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.study-coming-preview {
  perspective: 900px;
}

.study-coming-screen {
  min-height: 330px;
  padding: 24px;
  border: 1px solid rgba(71, 154, 255, 0.28);
  border-radius: 18px;
  background:
    radial-gradient(circle at 72% 24%, rgba(18, 105, 255, 0.2), transparent 34%),
    linear-gradient(135deg, rgba(5, 15, 32, 0.96), rgba(0, 4, 13, 0.98));
  box-shadow: 0 0 44px rgba(18, 105, 255, 0.14), inset 0 1px 0 rgba(255, 255, 255, 0.04);
  transform: rotateY(-8deg) rotateX(4deg);
}

.study-coming-screen > div {
  display: grid;
  grid-template-columns: 1fr 0.76fr 44px;
  gap: 12px;
  margin-bottom: 22px;
}

.study-coming-screen span,
.study-coming-screen article {
  display: block;
  border-radius: 10px;
  background: rgba(105, 137, 210, 0.16);
}

.study-coming-screen > div span {
  height: 42px;
}

.study-coming-screen section {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.study-coming-screen article {
  min-height: 92px;
  background:
    radial-gradient(circle at 82% 22%, rgba(103, 223, 255, 0.16), transparent 38%),
    rgba(105, 137, 210, 0.1);
}

.study-coming-screen footer {
  display: grid;
  grid-template-columns: 1fr 0.7fr 0.5fr;
  gap: 12px;
  margin-top: 18px;
}

.study-coming-screen footer span {
  height: 8px;
  background: linear-gradient(90deg, #1269ff, rgba(103, 223, 255, 0.58));
}

@media (max-width: 900px) {
  .study-coming-card {
    grid-template-columns: 1fr;
  }

  .study-coming-screen {
    transform: none;
  }
}

@media (max-width: 560px) {
  .study-coming-card {
    padding: 24px;
  }

  .study-coming-screen section {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 820px) {
  .study-tab-page .hub-main {
    padding: 28px 18px;
  }

  .study-tab-page .hub-nav,
  .study-tab-page .filter-row {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  .study-tab-page .hub-shell {
    padding-right: 14px;
    padding-left: 14px;
  }

  .study-tab-page .hub-sidebar,
  .study-tab-page .hub-main {
    padding: 22px 16px;
  }

  .study-tab-page .hub-nav,
  .study-tab-page .filter-row {
    grid-template-columns: 1fr;
  }
}

/* Dashboard-style tab refinements */
.study-tab-page .hub-hero {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-start;
  margin-bottom: 4px;
}

.study-tab-page .hub-hero h1 {
  max-width: 760px;
  margin: 6px 0;
  font-size: clamp(1.55rem, 2.2vw, 2.1rem);
  line-height: 1.12;
}

.study-tab-page .hub-hero p {
  max-width: 680px;
  font-size: 0.98rem;
}

.study-tab-page .hub-hero .hub-actions {
  margin-top: 16px;
}

.study-tab-page .subject-grid,
.study-tab-page .note-grid,
.study-tab-page .tool-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.study-tab-page .subject-card,
.study-tab-page .note-card,
.study-tab-page .tool-card {
  min-height: 0;
  gap: 10px;
  padding: 16px;
}

.study-tab-page .subject-card .visual-frame,
.study-tab-page .note-card .visual-frame {
  height: 124px;
  aspect-ratio: auto;
}

.study-tab-page .tool-card {
  min-height: 210px;
}

.study-tab-page .subject-card h2,
.study-tab-page .note-card h2,
.study-tab-page .tool-card h2 {
  font-size: 1.05rem;
}

.study-tab-page .subject-card p,
.study-tab-page .note-card p {
  display: -webkit-box;
  min-height: 3.1em;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.study-tab-page .tag-row {
  margin-top: auto;
}

@media (min-width: 1121px) {
  .study-tab-page .split-grid {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 0.58fr);
    align-items: start;
  }

  .study-tab-page .split-grid .note-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .study-tab-page #noteDetail {
    position: sticky;
    top: 22px;
  }
}

@media (max-width: 1120px) {
  .study-tab-page .subject-grid,
  .study-tab-page .note-grid,
  .study-tab-page .tool-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .study-tab-page .hub-hero {
    display: block;
  }

  .study-tab-page .subject-grid,
  .study-tab-page .note-grid,
  .study-tab-page .tool-grid {
    grid-template-columns: 1fr;
  }
}

/* Unified dashboard tabs */
.study-tab-page .study-app-screen {
  display: grid;
  align-content: start;
  gap: 24px;
}

.study-app-panel,
.study-command-card {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(105, 137, 210, 0.08);
  border-radius: 14px;
  background:
    radial-gradient(circle at 84% 8%, rgba(18, 105, 255, 0.1), transparent 34%),
    rgba(5, 15, 32, 0.64);
  box-shadow: none;
}

.study-app-panel {
  padding: 22px;
}

.study-app-panel.inset {
  padding: 18px;
  background:
    radial-gradient(circle at 12% 10%, rgba(93, 124, 255, 0.08), transparent 32%),
    rgba(2, 9, 22, 0.72);
}

.study-command-card {
  display: grid;
  min-height: 210px;
  align-content: start;
  gap: 12px;
  padding: 22px;
  color: #f5f8ff;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.study-command-card:hover,
.study-app-panel:hover {
  border-color: rgba(71, 154, 255, 0.36);
  box-shadow: 0 0 28px rgba(18, 105, 255, 0.12);
}

.study-command-card:hover {
  transform: translateY(-2px);
}

.study-command-card span {
  color: #5b93ff;
  font-size: 0.82rem;
  font-weight: 950;
  letter-spacing: 0.12em;
}

.study-command-card h3,
.study-app-panel h2 {
  margin: 0;
  color: #fff;
}

.study-command-card p,
.study-app-panel p {
  margin: 0;
  color: #9ca9bf;
  line-height: 1.58;
}

.study-section-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.study-app-screen .subject-grid,
.study-app-screen .note-grid,
.study-app-screen .tool-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.study-app-screen .subject-card,
.study-app-screen .note-card,
.study-app-screen .tool-card {
  border-color: rgba(105, 137, 210, 0.08);
  border-radius: 14px;
  background:
    radial-gradient(circle at 84% 8%, rgba(18, 105, 255, 0.1), transparent 34%),
    rgba(5, 15, 32, 0.64);
  box-shadow: none;
}

.study-app-screen .visual-frame {
  border-color: rgba(105, 137, 210, 0.12);
  border-radius: 12px;
}

.study-app-screen .filter-row {
  margin-bottom: 18px;
}

.study-app-screen .notes-filter-row {
  grid-template-columns: minmax(180px, 240px) auto;
  justify-content: start;
}

.study-app-screen .flashcard-stage {
  grid-template-columns: minmax(0, 1fr) minmax(260px, 0.34fr);
}

.study-app-screen .flashcard-viewer {
  min-height: 340px;
}

.study-settings-stack,
.study-goal-list {
  display: grid;
  gap: 10px;
  margin-top: 16px;
}

.resource-visual-panel {
  min-height: 320px;
  padding: 0;
}

.resource-visual-panel img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 320px;
  object-fit: cover;
  opacity: 0.9;
}

@media (max-width: 1180px) {
  .study-section-grid,
  .study-app-screen .subject-grid,
  .study-app-screen .note-grid,
  .study-app-screen .tool-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .study-app-screen .flashcard-stage,
  .study-app-screen .split-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .study-section-grid,
  .study-app-screen .subject-grid,
  .study-app-screen .note-grid,
  .study-app-screen .tool-grid,
  .study-app-screen .notes-filter-row {
    grid-template-columns: 1fr;
  }

  .study-app-panel {
    padding: 16px;
  }
}