:root {
  --bg: #eff5fc;
  --bg-2: #e6eef9;
  --bg-3: #dce8f6;
  --panel: rgba(255, 255, 255, 0.84);
  --panel-strong: rgba(255, 255, 255, 0.97);
  --panel-soft: rgba(246, 250, 255, 0.84);
  --ink: #0b1d33;
  --muted: #5b6f88;
  --line: rgba(66, 100, 146, 0.16);
  --accent: #2d6cf0;
  --accent-2: #1ea0ff;
  --accent-3: #bfd7ff;
  --accent-4: #173f8a;
  --shadow: 0 28px 70px rgba(42, 66, 104, 0.12);
  --glow: 0 0 0 1px rgba(45, 108, 240, 0.12), 0 18px 42px rgba(45, 108, 240, 0.14);
  --radius: 24px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(47, 140, 255, 0.16), transparent 26%),
    radial-gradient(circle at top right, rgba(35, 198, 168, 0.12), transparent 22%),
    linear-gradient(180deg, #f8fbff 0%, #f1f6fc 48%, #edf3fb 100%);
  font-family: "Aptos", "Segoe UI", "Helvetica Neue", sans-serif;
}

body {
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(120, 150, 180, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 150, 180, 0.035) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 92%);
}

button,
input,
select,
textarea {
  font: inherit;
}

.ambient {
  position: fixed;
  inset: auto;
  width: 42vw;
  height: 42vw;
  border-radius: 999px;
  pointer-events: none;
  filter: blur(88px);
  opacity: 0.42;
  z-index: 0;
  animation: drift 16s ease-in-out infinite;
}

.ambient-a {
  top: -15vw;
  left: -10vw;
  background: radial-gradient(circle, rgba(45, 108, 240, 0.28), transparent 62%);
}

.ambient-b {
  right: -12vw;
  bottom: -18vw;
  background: radial-gradient(circle, rgba(30, 160, 255, 0.18), transparent 58%);
  animation-delay: -8s;
}

@keyframes drift {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(2vw, -1vw, 0) scale(1.06); }
}

.page-shell {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(264px, 296px) minmax(0, 1fr);
  gap: 18px;
  width: min(2048px, calc(100vw - 24px));
  margin: 12px auto;
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 12px;
  align-self: start;
  padding: 26px 22px;
  border: 1px solid rgba(66, 100, 146, 0.12);
  border-radius: 28px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(244, 249, 255, 0.84)),
    radial-gradient(circle at top left, rgba(45, 108, 240, 0.08), transparent 36%);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.brand h1,
.topbar h2,
.card h3,
.detail-card h3,
.timeline-card h3,
.problem-card h3,
.decision-card h3,
.summary-action h3,
.command-palette h3 {
  font-family: "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  letter-spacing: 0.005em;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.22em;
}

.lede,
.muted,
.paper-subline,
.card p,
.detail-card p,
.timeline-card p,
.problem-card p,
.decision-card p,
.summary-action p,
.task-item p {
  color: var(--muted);
  line-height: 1.72;
}

.brand h1 {
  margin: 0;
  font-size: 1.88rem;
  line-height: 1.08;
}

.brand .lede {
  margin-top: 12px;
  font-size: 0.98rem;
}

.nav {
  display: grid;
  gap: 8px;
  margin: 26px 0 22px;
}

.nav-link,
.secondary-btn,
.primary-btn,
.filter-chip,
.status-btn {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.9);
  color: var(--ink);
  cursor: pointer;
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.nav-link {
  padding: 12px 15px;
  text-align: left;
  font-weight: 600;
}

.nav-link:hover,
.secondary-btn:hover,
.primary-btn:hover,
.filter-chip:hover,
.status-btn:hover {
  transform: translateY(-1px);
  border-color: rgba(47, 140, 255, 0.30);
  box-shadow: 0 12px 24px rgba(47, 140, 255, 0.10);
}

.nav-link.active {
  background:
    linear-gradient(135deg, rgba(45, 108, 240, 0.18), rgba(30, 160, 255, 0.12)),
    rgba(255, 255, 255, 0.96);
  border-color: rgba(45, 108, 240, 0.32);
  box-shadow: inset 0 0 0 1px rgba(45, 108, 240, 0.08), 0 14px 28px rgba(45, 108, 240, 0.10);
}

.sidebar-card,
.hero-card,
.stat-card,
.card,
.detail-card,
.timeline-card,
.problem-card,
.decision-card,
.summary-action,
.task-item,
.command-palette,
.command-item {
  position: relative;
  overflow: hidden;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.sidebar-card,
.card,
.detail-card,
.timeline-card,
.problem-card,
.decision-card,
.stat-card {
  padding: 20px;
}

.sidebar-card {
  margin-top: 16px;
}

.chip-row,
.tag-row,
.meta-row,
.filter-row,
.task-meta,
.topbar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip,
.tag,
.status-pill {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(240, 246, 255, 0.96);
  color: var(--muted);
  border: 1px solid rgba(66, 100, 146, 0.12);
  font-size: 0.84rem;
}

.status-pill {
  font-size: 0.78rem;
  justify-content: center;
  min-width: 5.5em;
  white-space: nowrap;
  word-break: keep-all;
  flex-shrink: 0;
}

.status-want {
  color: #ffbe7b;
  background: rgba(255, 196, 107, 0.12);
}

.status-reading {
  color: #78e0c5;
  background: rgba(124, 224, 195, 0.12);
}

.status-read {
  color: #6fd7ff;
  background: rgba(89, 212, 255, 0.14);
}

.status-pause {
  color: #b9b6ff;
  background: rgba(151, 166, 255, 0.14);
}

.status-not_now {
  color: #ff9b75;
  background: rgba(255, 155, 117, 0.14);
}

.status-disliked {
  color: #ff6b7d;
  background: rgba(255, 107, 125, 0.14);
}

.status-not_now {
  color: #ff9d8f;
  background: rgba(255, 123, 99, 0.14);
}

.status-disliked {
  color: #ff6f91;
  background: rgba(255, 111, 145, 0.14);
}

.main {
  padding: 12px 12px 18px 0;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
  padding: 18px 20px;
  border: 1px solid rgba(66, 100, 146, 0.12);
  border-radius: 26px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(246, 250, 255, 0.84)),
    radial-gradient(circle at top right, rgba(45, 108, 240, 0.08), transparent 30%);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
}

.secondary-btn,
.primary-btn {
  padding: 11px 16px;
  border-radius: 14px;
}

.secondary-btn {
  background: rgba(255, 255, 255, 0.88);
}

.primary-btn {
  background: linear-gradient(135deg, rgba(45, 108, 240, 0.96), rgba(30, 160, 255, 0.96));
  color: white;
  border-color: transparent;
  font-weight: 700;
  box-shadow: 0 18px 32px rgba(45, 108, 240, 0.18);
}

.view {
  display: none;
}

.view.active {
  display: block;
  animation: view-in 280ms ease;
}

@keyframes view-in {
  from {
    opacity: 0;
    transform: translateY(8px) scale(0.995);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.hero-card,
.dashboard-grid,
.papers-layout,
.inbox-layout,
.timeline-grid,
.problem-grid,
.decision-grid,
.stats-grid,
.summary-actions {
  display: grid;
  gap: 16px;
}

.hero-card {
  grid-template-columns: 1.45fr 0.95fr;
  padding: 26px;
  margin-bottom: 18px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.96), rgba(244, 249, 255, 0.95)),
    radial-gradient(circle at top left, rgba(45, 108, 240, 0.10), transparent 30%);
}

.hero-card::before,
.card::before,
.topic-spotlight::before,
.sync-banner::before,
.empty-state::before,
.cluster-item::before,
.paper-item::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), rgba(30, 160, 255, 0.78), transparent);
  opacity: 0.7;
}

.stats-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-bottom: 18px;
}

.dashboard-grid {
  grid-template-columns: 1.08fr 0.92fr;
}

.papers-layout {
  grid-template-columns: 0.84fr 1.16fr;
}

.timeline-grid,
.problem-grid,
.decision-grid,
.summary-actions,
.inbox-layout {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.value {
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--ink);
}

.cluster-list,
.paper-list,
.decision-list,
.task-list,
.detail-grid {
  display: grid;
  gap: 12px;
}

.cluster-item,
.paper-item,
.timeline-item,
.decision-result,
.task-item,
.summary-action,
.command-item {
  padding: 14px;
  border-radius: 20px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(246, 250, 255, 0.98)),
    radial-gradient(circle at top right, rgba(45, 108, 240, 0.06), transparent 30%);
  border: 1px solid rgba(66, 100, 146, 0.12);
}

.cluster-item h4,
.paper-item h4,
.timeline-item h4,
.task-item h4 {
  margin: 0 0 6px;
  font-size: 1rem;
}

.paper-item,
.cluster-item.clickable,
.summary-action,
.task-item,
.command-item {
  cursor: pointer;
}

.paper-item.active,
.cluster-item.clickable:hover,
.summary-action:hover,
.task-item:hover,
.command-item:hover {
  transform: translateY(-2px);
  border-color: rgba(45, 108, 240, 0.30);
  box-shadow: var(--glow);
}

.paper-item.active {
  border-color: rgba(45, 108, 240, 0.38);
  box-shadow: inset 0 0 0 1px rgba(45, 108, 240, 0.10), var(--glow);
}

.paper-item-top,
.section-head,
.task-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
}

.detail-top-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 320px);
  gap: 18px;
  align-items: start;
  margin-top: 8px;
}

.detail-top-main {
  min-width: 0;
}

.detail-top-main > p {
  margin-top: 0;
}

.detail-top-side {
  display: flex;
  justify-content: flex-end;
}

.tier-badge {
  min-width: 34px;
  text-align: center;
  padding: 5px 8px;
  border-radius: 999px;
  font-weight: 700;
  color: #07111d;
}

.tier-A { background: linear-gradient(135deg, #78e0c5, #59d4ff); }
.tier-B { background: linear-gradient(135deg, #ffc46b, #ff9466); }
.tier-C { background: linear-gradient(135deg, #b8a8ff, #8ea6ff); }

.filters-bar {
  display: grid;
  gap: 12px;
  margin-bottom: 16px;
}

.filter-chip.active,
.status-btn.active {
  background: linear-gradient(135deg, rgba(45, 108, 240, 0.14), rgba(30, 160, 255, 0.12));
  border-color: rgba(45, 108, 240, 0.30);
}

.search-input,
.select-input,
.textarea-input {
  width: 100%;
  padding: 12px 14px;
  border-radius: 16px;
  border: 1px solid rgba(66, 100, 146, 0.16);
  color: var(--ink);
  background: rgba(255, 255, 255, 0.96);
}

.textarea-input {
  min-height: 120px;
  resize: vertical;
}

.search-input::placeholder {
  color: rgba(96, 117, 142, 0.74);
}

.detail-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 700;
}

.detail-link:hover {
  text-decoration: underline;
}

.detail-preview-card {
  display: grid;
  gap: 8px;
  width: 100%;
  padding: 10px;
  border-radius: 18px;
  border: 1px solid rgba(45, 108, 240, 0.16);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(244, 249, 255, 0.95)),
    radial-gradient(circle at top right, rgba(45, 108, 240, 0.08), transparent 34%);
  cursor: zoom-in;
  text-align: left;
  box-shadow: 0 16px 34px rgba(45, 108, 240, 0.08);
}

.detail-preview-card img {
  display: block;
  width: 100%;
  border-radius: 12px;
  border: 1px solid rgba(66, 100, 146, 0.14);
}

.detail-preview-label {
  color: var(--accent);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.detail-preview-caption {
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.45;
}

.detail-link-btn {
  text-decoration: none;
}

.quick-brief-actions {
  margin-top: 12px;
}

.quick-understand-card {
  margin-top: 18px;
  padding: 18px;
  border-radius: 20px;
  border: 1px solid rgba(45, 108, 240, 0.18);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(244, 249, 255, 0.98)),
    radial-gradient(circle at top right, rgba(45, 108, 240, 0.08), transparent 32%);
}

.quick-understand-card.collapsed {
  display: none;
}

.quick-understand-card.collapsed .quick-takeaway,
.quick-understand-card.collapsed .quick-understand-grid {
  display: none;
}

.quick-takeaway {
  margin: 10px 0 0;
  font-size: 1.02rem;
  color: var(--ink);
}

.quick-understand-grid {
  display: grid;
  gap: 16px;
  margin-top: 16px;
}

.quick-understand-grid.with-figure {
  grid-template-columns: minmax(220px, 0.82fr) minmax(0, 1.18fr);
}

.quick-understand-grid.no-figure {
  grid-template-columns: 1fr;
}

.quick-figure {
  margin: 0;
  padding: 12px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(66, 100, 146, 0.12);
}

.quick-figure-button {
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: zoom-in;
}

.quick-figure img {
  display: block;
  width: 100%;
  border-radius: 12px;
  border: 1px solid rgba(66, 100, 146, 0.14);
}

.quick-figure figcaption {
  margin-top: 10px;
  color: var(--muted);
  line-height: 1.55;
  font-size: 0.92rem;
}

.quick-copy {
  display: grid;
  gap: 12px;
}

.quick-block {
  padding: 14px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.84);
  border: 1px solid rgba(66, 100, 146, 0.12);
}

.quick-block h5 {
  margin: 0 0 8px;
  font-size: 0.95rem;
}

.quick-block p {
  margin: 0;
}

.quick-list {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.65;
}

.quick-list li + li {
  margin-top: 6px;
}

.problem-card.priority {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.96), rgba(245, 250, 255, 0.96)),
    radial-gradient(circle at top left, rgba(45, 108, 240, 0.08), transparent 34%);
}

.week-number {
  color: var(--accent);
  font-weight: 700;
}

.status-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 4px;
}

.detail-section {
  margin-top: 16px;
  border-top: 1px solid rgba(66, 100, 146, 0.14);
  padding-top: 16px;
}

.detail-section h4 {
  margin: 0;
}

.detail-section-toggle {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  background: transparent;
  border: 0;
  color: var(--ink);
  padding: 0;
  cursor: pointer;
  text-align: left;
}

.detail-section-toggle span:last-child {
  color: var(--accent);
  font-size: 0.92rem;
}

.detail-section.collapsed .detail-body {
  display: none;
}

.summary-actions {
  margin-top: 16px;
}

.topic-spotlight,
.sync-banner,
.empty-state {
  position: relative;
  overflow: hidden;
  border-radius: 22px;
  border: 1px solid rgba(66, 100, 146, 0.14);
  background: rgba(255, 255, 255, 0.92);
}

.topic-spotlight {
  padding: 20px;
  margin-bottom: 16px;
}

.topic-spotlight.compact {
  margin-bottom: 0;
}

.sync-banner {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  padding: 12px 16px;
  margin-bottom: 16px;
}

.sync-banner.inline {
  margin-bottom: 14px;
}

.sync-banner.online {
  background: linear-gradient(135deg, rgba(111, 215, 255, 0.14), rgba(120, 224, 197, 0.14));
}

.sync-banner.offline {
  background: linear-gradient(135deg, rgba(255, 180, 73, 0.14), rgba(255, 120, 120, 0.10));
}

.sync-banner strong {
  display: block;
}

.sync-banner span {
  color: var(--muted);
  line-height: 1.55;
}

.inbox-form,
.inbox-list-card .paper-list {
  display: grid;
  gap: 12px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.inbox-form label {
  display: grid;
  gap: 8px;
  color: var(--ink);
}

.inbox-item {
  cursor: default;
}

.inbox-status {
  font-size: 0.78rem;
}

.inbox-new {
  color: #5c80ff;
  background: rgba(92, 128, 255, 0.14);
}

.inbox-shortlisted {
  color: #23c6a8;
  background: rgba(35, 198, 168, 0.14);
}

.inbox-imported {
  color: #2f8cff;
  background: rgba(47, 140, 255, 0.14);
}

.inbox-rejected {
  color: #ff7f5a;
  background: rgba(255, 127, 90, 0.14);
}

.sync-note {
  margin: 12px 0 0;
  color: var(--muted);
}

.active-soft {
  background: linear-gradient(135deg, rgba(255, 107, 125, 0.12), rgba(255, 155, 117, 0.12));
  border-color: rgba(255, 107, 125, 0.28);
}

.empty-state {
  padding: 20px;
}

.empty-state h4 {
  margin-top: 0;
}

.summary-action {
  position: relative;
  overflow: hidden;
}

.summary-action::after {
  content: "";
  position: absolute;
  inset: auto -10% -40% auto;
  width: 160px;
  height: 160px;
  border-radius: 999px;
  background: radial-gradient(circle, rgba(89, 212, 255, 0.18), transparent 66%);
}

.progress-wrap {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.progress-track {
  width: 100%;
  height: 10px;
  border-radius: 999px;
  overflow: hidden;
  background: rgba(118, 147, 186, 0.14);
}

.progress-bar {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 18px rgba(89, 212, 255, 0.28);
  transition: width 260ms ease;
}

.micro-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.micro-stat {
  padding: 12px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(66, 100, 146, 0.12);
}

.micro-stat strong {
  display: block;
  font-size: 1.15rem;
  margin-bottom: 4px;
}

#command-palette-root {
  position: relative;
  z-index: 20;
}

.command-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(233, 241, 251, 0.62);
  backdrop-filter: blur(10px);
}

.command-palette {
  position: fixed;
  top: 10vh;
  left: 50%;
  transform: translateX(-50%);
  width: min(760px, calc(100vw - 32px));
  padding: 20px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.97), rgba(247, 251, 255, 0.99));
}

.command-grid {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.command-item small {
  color: var(--muted);
}

.task-list {
  margin-top: 14px;
}

.task-item {
  position: relative;
}

.task-item::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 18px;
  bottom: 18px;
  width: 3px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--accent), transparent);
  opacity: 0.7;
}

.timeline-item {
  cursor: default;
}

.timeline-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.task-meta {
  margin-bottom: 8px;
}

.status-filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

@media (max-width: 1180px) {
  .page-shell,
  .dashboard-grid,
  .papers-layout,
  .inbox-layout,
  .hero-card,
  .timeline-grid,
  .problem-grid,
  .decision-grid,
  .summary-actions {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .sidebar {
    position: static;
    border-bottom: 1px solid rgba(66, 100, 146, 0.14);
  }
}

@media (max-width: 720px) {
  .page-shell,
  .stats-grid,
  .micro-stats,
  .form-grid {
    grid-template-columns: 1fr;
  }

  .main,
  .sidebar {
    padding: 16px;
  }

  .topbar {
    position: static;
    align-items: flex-start;
    flex-direction: column;
  }

  .sync-banner {
    flex-direction: column;
    align-items: flex-start;
  }
}

#codex-prompt-root {
  position: relative;
  z-index: 24;
}

#deep-understand-root {
  position: relative;
  z-index: 26;
}

#image-viewer-root {
  position: relative;
  z-index: 28;
}

.deep-understand-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(12, 20, 34, 0.56);
  backdrop-filter: blur(12px);
  z-index: 26;
}

.deep-understand-modal {
  position: fixed;
  top: 4vh;
  left: 50%;
  transform: translateX(-50%);
  width: min(1180px, calc(100vw - 28px));
  max-height: 92vh;
  overflow: auto;
  padding: 24px;
  border-radius: 28px;
  border: 1px solid rgba(118, 147, 186, 0.18);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(244, 249, 255, 0.98)),
    radial-gradient(circle at top right, rgba(47, 140, 255, 0.08), transparent 28%);
  box-shadow: 0 34px 90px rgba(18, 35, 60, 0.28);
  z-index: 27;
}

.deep-understand-head {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  align-items: start;
}

.deep-understand-actions {
  display: grid;
  gap: 10px;
  justify-items: end;
}

.teaching-hero,
.teaching-strip,
.teaching-steps,
.deep-understand-grid,
.teaching-questions {
  display: grid;
  gap: 16px;
}

.teaching-hero {
  grid-template-columns: 1.15fr 0.85fr;
  margin-top: 18px;
}

.teaching-hero-copy,
.teaching-panel,
.teaching-step-card,
.teaching-chip-card {
  padding: 18px;
  border-radius: 20px;
  border: 1px solid rgba(118, 147, 186, 0.14);
  background: rgba(255, 255, 255, 0.88);
}

.teaching-hero-copy {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.96), rgba(244, 249, 255, 0.94)),
    radial-gradient(circle at top left, rgba(47, 140, 255, 0.08), transparent 34%);
}

.teaching-hero-copy h4,
.teaching-panel h4,
.teaching-step-card h5,
.teaching-chip-card h5 {
  margin: 0 0 10px;
}

.teaching-hero-figure {
  display: grid;
  gap: 10px;
  padding: 14px;
  border-radius: 20px;
  border: 1px solid rgba(118, 147, 186, 0.14);
  background: rgba(255, 255, 255, 0.9);
  cursor: zoom-in;
}

.teaching-hero-figure img {
  width: 100%;
  display: block;
  border-radius: 14px;
  border: 1px solid rgba(118, 147, 186, 0.14);
}

.teaching-hero-figure span {
  color: var(--muted);
  line-height: 1.55;
  text-align: left;
}

.teaching-strip {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 16px;
}

.teaching-chip-card h5 {
  font-size: 0.88rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.teaching-section {
  margin-top: 18px;
}

.teaching-steps {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 14px;
}

.teaching-step-index {
  display: inline-flex;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(47, 140, 255, 0.12);
  color: var(--accent);
  font-size: 0.82rem;
  margin-bottom: 12px;
}

.deep-understand-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 16px;
}

.teaching-questions {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 12px;
}

.prompt-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(12, 20, 34, 0.52);
  backdrop-filter: blur(12px);
}

.prompt-modal {
  position: fixed;
  top: 8vh;
  left: 50%;
  transform: translateX(-50%);
  width: min(960px, calc(100vw - 32px));
  max-height: 84vh;
  overflow: auto;
  padding: 22px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(246, 250, 255, 0.98));
  border: 1px solid rgba(118, 147, 186, 0.18);
  border-radius: 24px;
  box-shadow: 0 30px 80px rgba(18, 35, 60, 0.28);
}

.prompt-grid {
  display: grid;
  grid-template-columns: 0.92fr 1.08fr;
  gap: 16px;
  margin-top: 16px;
}

.prompt-panel {
  padding: 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(118, 147, 186, 0.14);
}

.prompt-panel h4 {
  margin: 0 0 10px;
}

.prompt-textarea {
  width: 100%;
  min-height: 146px;
  padding: 12px 14px;
  border-radius: 16px;
  border: 1px solid rgba(118, 147, 186, 0.18);
  background: rgba(255, 255, 255, 0.96);
  color: var(--ink);
  resize: vertical;
}

.prompt-output {
  min-height: 320px;
  white-space: pre-wrap;
  line-height: 1.65;
  color: var(--ink);
  font-family: Consolas, "SFMono-Regular", Menlo, monospace;
  font-size: 0.93rem;
}

.prompt-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.context-list {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.context-item {
  padding: 12px;
  border-radius: 14px;
  background: rgba(247, 250, 255, 0.92);
  border: 1px solid rgba(118, 147, 186, 0.12);
}

.image-viewer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(12, 20, 34, 0.62);
  backdrop-filter: blur(12px);
  z-index: 28;
}

.image-viewer-modal {
  position: fixed;
  top: 5vh;
  left: 50%;
  transform: translateX(-50%);
  width: min(1100px, calc(100vw - 32px));
  max-height: 90vh;
  overflow: auto;
  padding: 20px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(246, 250, 255, 0.98));
  border: 1px solid rgba(118, 147, 186, 0.18);
  border-radius: 24px;
  box-shadow: 0 30px 80px rgba(18, 35, 60, 0.28);
  z-index: 29;
}

.image-viewer-head {
  align-items: center;
}

.image-viewer-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.image-viewer-nav {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-top: 16px;
}

.image-viewer-img {
  display: block;
  width: 100%;
  height: auto;
  margin-top: 16px;
  border-radius: 18px;
  border: 1px solid rgba(118, 147, 186, 0.16);
  box-shadow: 0 18px 44px rgba(18, 35, 60, 0.16);
}

.image-viewer-caption {
  margin: 12px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.image-viewer-thumbs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.image-thumb {
  padding: 0;
  border: 2px solid rgba(118, 147, 186, 0.12);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.92);
  cursor: pointer;
  overflow: hidden;
}

.image-thumb.active {
  border-color: var(--accent);
  box-shadow: 0 10px 24px rgba(18, 35, 60, 0.12);
}

.image-thumb img {
  display: block;
  width: 100%;
  height: 88px;
  object-fit: cover;
}

@media (max-width: 980px) {
  .prompt-grid {
    grid-template-columns: 1fr;
  }

  .deep-understand-head,
  .teaching-hero,
  .teaching-strip,
  .teaching-steps,
  .deep-understand-grid,
  .teaching-questions {
    grid-template-columns: 1fr;
  }

  .deep-understand-modal {
    top: 3vh;
    max-height: 94vh;
    padding: 18px;
  }

  .prompt-modal {
    top: 4vh;
    max-height: 90vh;
  }

  .quick-understand-grid.with-figure {
    grid-template-columns: 1fr;
  }

  .detail-top-grid {
    grid-template-columns: 1fr;
  }

  .detail-top-side {
    justify-content: flex-start;
  }

  .detail-preview-card {
    width: min(360px, 100%);
  }

  .teaching-hero,
  .deep-understand-grid,
  .teaching-strip,
  .teaching-steps {
    grid-template-columns: 1fr;
  }

  .deep-understand-modal {
    top: 2vh;
    max-height: 95vh;
    padding: 18px;
  }

  .image-viewer-modal {
    top: 3vh;
    max-height: 92vh;
  }
}