:root {
  --canvas: #d5d5d5;
  --canvas-2: #e1e1e1;
  --panel: #fbfbfa;
  --panel-strong: #ffffff;
  --ink: #111214;
  --ink-soft: #3f4145;
  --ink-muted: #5d6065;
  --stroke: #a9abad;
  --stroke-strong: #7f8388;
  --accent: #2f5f58;
  --accent-soft: rgba(47, 95, 88, 0.12);
  --danger: #8f3d3d;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --shadow-sm: 0 8px 24px rgba(13, 20, 28, 0.06);
  --shadow-md: 0 14px 32px rgba(13, 20, 28, 0.09);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Space Grotesk", "Helvetica Neue", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 14%, rgba(255, 255, 255, 0.5), transparent 42%),
    radial-gradient(circle at 86% 76%, rgba(0, 0, 0, 0.06), transparent 40%),
    var(--canvas);
  line-height: 1.58;
  padding: 1.4rem;
  position: relative;
  overflow-x: hidden;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  line-height: 1.25;
  color: var(--ink);
}

h1 {
  font-size: clamp(1.65rem, 3vw, 2.6rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.16rem, 2vw, 1.55rem);
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.05rem;
}

p {
  margin: 0;
}

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(12, 15, 20, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(12, 15, 20, 0.04) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: radial-gradient(circle at center, rgba(0, 0, 0, 0.68), transparent 86%);
}

.bg-orb {
  position: fixed;
  border-radius: 999px;
  z-index: 0;
  pointer-events: none;
  filter: blur(48px);
  opacity: 0.32;
}

.orb-a {
  width: 300px;
  height: 300px;
  top: -100px;
  right: -90px;
  background: radial-gradient(circle, rgba(120, 126, 138, 0.7) 0%, rgba(120, 126, 138, 0) 70%);
  animation: float-a 12s ease-in-out infinite;
}

.orb-b {
  width: 360px;
  height: 360px;
  bottom: -120px;
  left: -110px;
  background: radial-gradient(circle, rgba(106, 124, 146, 0.62) 0%, rgba(106, 124, 146, 0) 72%);
  animation: float-b 13s ease-in-out infinite;
}

.topbar {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.9rem;
  padding: 1.15rem 1.2rem;
  border-radius: 14px;
  border: 1px solid var(--stroke);
  background: linear-gradient(150deg, rgba(255, 255, 255, 0.45), rgba(248, 248, 247, 0.72));
  box-shadow: var(--shadow-sm);
}

.eyebrow {
  margin: 0 0 0.35rem;
  font-family: "IBM Plex Mono", "SFMono-Regular", ui-monospace, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.subtitle {
  margin-top: 0.48rem;
  max-width: 62ch;
  color: var(--ink-soft);
}

.topbar-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.34rem;
  padding-right: 0.14rem;
}

.view-nav {
  position: relative;
  z-index: 2;
  margin-top: 0.92rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.view-btn,
.primary-btn,
.ghost-btn,
.resource-link,
.scenario-choice,
.lesson-item,
.timeline-item,
.quiz-option {
  font-family: "Space Grotesk", "Helvetica Neue", "Segoe UI", sans-serif;
}

.view-btn {
  border: 1px solid var(--stroke);
  border-radius: 6px;
  padding: 0.48rem 0.72rem;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.11em;
  font-family: "IBM Plex Mono", "SFMono-Regular", ui-monospace, monospace;
  color: var(--ink-soft);
  background: rgba(255, 255, 255, 0.76);
  cursor: pointer;
  transition: 160ms ease;
}

.view-btn:hover {
  transform: translateY(-1px);
  border-color: var(--stroke-strong);
  background: #fff;
}

.view-btn.active {
  color: #fff;
  border-color: rgba(17, 18, 20, 0.35);
  background: #111214;
}

.main-grid {
  position: relative;
  z-index: 2;
  margin-top: 0.92rem;
}

.view {
  display: none;
  animation: fade-up 250ms ease;
}

.view.active {
  display: block;
}

.panel {
  margin-top: 0.76rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--stroke);
  background: rgba(251, 251, 250, 0.92);
  box-shadow: var(--shadow-sm);
  padding: 0.92rem 1rem;
}

.panel h2 {
  margin-bottom: 0.44rem;
}

.panel-title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 0.52rem;
}

.pill {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  border: 1px solid var(--stroke);
  background: #f3f4f5;
  color: var(--ink-soft);
  padding: 0.24rem 0.64rem;
  font-family: "IBM Plex Mono", "SFMono-Regular", ui-monospace, monospace;
  font-size: 0.73rem;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.muted {
  color: var(--ink-muted);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.68rem;
}

.stat-tile {
  border-radius: var(--radius-md);
  border: 1px solid var(--stroke);
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.95), rgba(246, 246, 244, 0.95));
  box-shadow: var(--shadow-sm);
  padding: 0.74rem 0.82rem;
  display: grid;
  gap: 0.1rem;
}

.stat-label,
.stat-sub,
.week-kind,
.lesson-item-meta,
.module-meta,
.label,
.timeline-era,
.activity-date,
.journal-item-date,
.phase-weeks,
.resource-card-description {
  font-family: "IBM Plex Mono", "SFMono-Regular", ui-monospace, monospace;
}

.stat-label {
  font-size: 0.71rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.stat-value {
  font-size: 1.46rem;
  letter-spacing: -0.02em;
}

.stat-sub {
  font-size: 0.72rem;
  color: var(--ink-muted);
}

.learning-phases,
.weekly-roadmap {
  margin-top: 0.78rem;
  display: grid;
  gap: 0.6rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.phase-card,
.week-card {
  border-radius: var(--radius-md);
  border: 1px solid var(--stroke);
  background: var(--panel-strong);
  padding: 0.66rem 0.72rem;
}

.phase-card h3,
.week-card h3 {
  font-size: 0.98rem;
}

.phase-weeks {
  margin: 0.24rem 0 0.3rem;
  color: var(--ink-muted);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.phase-card ul {
  margin: 0.45rem 0 0;
  padding-left: 1rem;
}

.week-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
}

.week-kind {
  color: var(--ink-muted);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.week-card.done {
  border-left: 4px solid var(--accent);
}

.expedition-grid {
  margin-top: 0.72rem;
  display: grid;
  gap: 0.58rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.expedition-card {
  border-radius: var(--radius-md);
  border: 1px solid var(--stroke);
  background: #fff;
  padding: 0.66rem 0.72rem;
}

.expedition-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.6rem;
}

.expedition-card h3 {
  font-size: 0.98rem;
}

.expedition-route {
  margin-top: 0.36rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.expedition-card ul {
  margin: 0.46rem 0 0;
  padding-left: 1rem;
  display: grid;
  gap: 0.3rem;
}

.expedition-card li {
  font-size: 0.88rem;
}

.duo {
  display: grid;
  gap: 0.9rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.clean-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.numbered-list {
  padding-left: 1.25rem;
}

.numbered-list li {
  margin-bottom: 0.32rem;
}

.gossip-panel {
  max-width: 84ch;
}

.gossip-title {
  margin: 0.24rem 0 0.2rem;
  font-size: 1rem;
  font-weight: 600;
}

.activity-feed {
  display: grid;
  gap: 0.52rem;
}

.activity-item {
  display: grid;
  gap: 0.12rem;
  padding-left: 0.62rem;
  border-left: 2px solid rgba(47, 95, 88, 0.4);
}

.activity-date {
  font-size: 0.71rem;
  color: var(--ink-muted);
}

.activity-text {
  font-size: 0.9rem;
  color: var(--ink);
}

.course-layout {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: minmax(252px, 335px) 1fr;
}

.lesson-catalog {
  max-height: calc(100vh - 224px);
  overflow: auto;
}

.module-block {
  margin-bottom: 0.86rem;
}

.module-header {
  margin-bottom: 0.42rem;
}

.module-title {
  font-size: 0.95rem;
  font-weight: 700;
}

.module-meta {
  font-size: 0.69rem;
  color: var(--ink-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.lesson-list {
  display: grid;
  gap: 0.34rem;
}

.lesson-item {
  width: 100%;
  text-align: left;
  border-radius: var(--radius-sm);
  border: 1px solid var(--stroke);
  background: #fff;
  color: var(--ink);
  padding: 0.56rem 0.66rem;
  cursor: pointer;
  transition: 150ms ease;
}

.lesson-item:hover {
  border-color: var(--stroke-strong);
  transform: translateX(2px);
}

.lesson-item.active {
  border-color: rgba(36, 66, 86, 0.48);
  background: linear-gradient(140deg, rgba(244, 248, 252, 0.96), rgba(251, 251, 251, 0.96));
}

.lesson-item.done {
  border-left: 4px solid var(--accent);
}

.lesson-item-title {
  display: block;
  font-size: 0.86rem;
  font-weight: 600;
}

.lesson-item-meta {
  display: block;
  margin-top: 0.08rem;
  font-size: 0.67rem;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.lesson-workspace {
  min-height: 66vh;
}

.lesson-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem 1rem;
}

.lesson-topic-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  align-items: center;
}

.lesson-meta {
  color: var(--ink-muted);
  font-size: 0.84rem;
}

.time-position {
  margin-top: 0.82rem;
  max-width: 88ch;
  border-radius: var(--radius-md);
  border: 1px solid var(--stroke);
  background: linear-gradient(150deg, rgba(255, 255, 255, 0.98), rgba(245, 246, 247, 0.96));
  padding: 0.72rem;
}

.time-line {
  position: relative;
  margin-top: 0.44rem;
  height: 12px;
  border-radius: 999px;
  border: 1px solid var(--stroke);
  background: rgba(214, 217, 220, 0.62);
  overflow: hidden;
}

.time-line-fill {
  position: absolute;
  inset: 0 auto 0 0;
  background: linear-gradient(90deg, rgba(39, 77, 74, 0.75), rgba(26, 51, 61, 0.82));
}

.time-line-marker {
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 16px;
  height: 16px;
  border-radius: 999px;
  border: 2px solid #111214;
  background: #fff;
}

.time-axis-edges {
  margin-top: 0.22rem;
  display: flex;
  justify-content: space-between;
  gap: 0.6rem;
  font-size: 0.66rem;
  color: var(--ink-muted);
  font-family: "IBM Plex Mono", "SFMono-Regular", ui-monospace, monospace;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.time-era-summary {
  margin-top: 0.34rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.36rem;
}

.time-era-summary span {
  border-radius: 999px;
  border: 1px solid var(--stroke);
  background: rgba(255, 255, 255, 0.8);
  padding: 0.18rem 0.52rem;
  font-size: 0.72rem;
  color: var(--ink-soft);
}

.time-segment-strip {
  margin-top: 0.52rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.44rem;
}

.time-segment {
  text-align: left;
  border-radius: 10px;
  border: 1px solid var(--stroke);
  background: #fff;
  padding: 0.46rem 0.52rem;
  cursor: pointer;
  display: grid;
  gap: 0.12rem;
  transition: 150ms ease;
  min-width: 150px;
}

.time-segment:hover {
  border-color: var(--stroke-strong);
  transform: translateY(-1px);
}

.time-segment.active {
  border-color: rgba(17, 18, 20, 0.4);
  background: #111214;
  color: #fff;
}

.time-segment-era {
  font-size: 0.65rem;
  font-family: "IBM Plex Mono", "SFMono-Regular", ui-monospace, monospace;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--ink-muted);
}

.time-segment.active .time-segment-era {
  color: rgba(255, 255, 255, 0.76);
}

.time-segment-title {
  font-size: 0.8rem;
  font-weight: 600;
}

.lesson-hero {
  margin: 0.8rem 0 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--stroke);
  overflow: hidden;
  background: linear-gradient(160deg, rgba(240, 241, 242, 0.92), rgba(228, 232, 236, 0.92));
  max-width: 88ch;
}

.lesson-hero img {
  display: block;
  width: 100%;
  height: clamp(280px, 44vw, 560px);
  object-fit: contain;
  background: rgba(238, 239, 240, 0.9);
}

.lesson-hero figcaption {
  padding: 0.44rem 0.62rem;
  font-size: 0.76rem;
  color: var(--ink-muted);
  font-family: "IBM Plex Mono", "SFMono-Regular", ui-monospace, monospace;
}

.read-layer {
  margin-top: 0.82rem;
  max-width: 88ch;
}

.read-layer-grid {
  margin-top: 0.52rem;
  display: grid;
  gap: 0.52rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.read-layer-card {
  border-radius: var(--radius-sm);
  border: 1px solid var(--stroke);
  background: var(--panel-strong);
  padding: 0.58rem 0.64rem;
}

.read-layer-card h4 {
  font-size: 0.92rem;
}

.read-layer-card p {
  margin-top: 0.34rem;
  font-size: 0.9rem;
  line-height: 1.54;
}

.book-article,
.lesson-reading,
.story-section,
.wow-facts,
.relation-section,
.scenario-section {
  margin-top: 0.85rem;
  max-width: 88ch;
}

.book-article {
  border: 1px solid var(--stroke);
  border-radius: var(--radius-md);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.98), rgba(248, 248, 246, 0.94));
  padding: 0.78rem;
}

.book-intro {
  margin-top: 0.48rem;
  font-size: 0.98rem;
  line-height: 1.67;
  color: var(--ink-soft);
}

.book-narrative {
  margin-top: 0.56rem;
  display: grid;
  gap: 0.62rem;
}

.book-narrative p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.76;
  color: var(--ink);
}

.book-article-body {
  margin-top: 0.58rem;
  display: grid;
  gap: 0.55rem;
}

.book-block {
  border-radius: var(--radius-sm);
  border: 1px solid var(--stroke);
  background: var(--panel-strong);
  padding: 0.58rem 0.66rem;
}

.book-block h4 {
  font-size: 0.95rem;
}

.book-block p {
  margin-top: 0.38rem;
  font-size: 0.95rem;
  line-height: 1.66;
}

.book-block ul,
.book-block ol {
  margin: 0.4rem 0 0;
  padding-left: 1.1rem;
  display: grid;
  gap: 0.34rem;
}

.book-block li {
  font-size: 0.92rem;
  line-height: 1.56;
}

.story-grid,
.relation-grid,
.scenario-grid,
.resource-grid {
  margin-top: 0.52rem;
  display: grid;
  gap: 0.54rem;
}

.story-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.relation-grid,
.scenario-grid {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.story-card,
.relation-card,
.scenario-card,
.mini-card,
.resource-card {
  border-radius: var(--radius-sm);
  border: 1px solid var(--stroke);
  background: var(--panel-strong);
}

.story-card,
.relation-card,
.scenario-card,
.mini-card {
  padding: 0.6rem 0.68rem;
}

.story-card h4,
.relation-card h4,
.scenario-card h4 {
  font-size: 0.94rem;
}

.story-card p,
.relation-card p,
.scenario-card p {
  margin-top: 0.38rem;
  font-size: 0.9rem;
  line-height: 1.55;
}

.story-why {
  color: var(--ink-soft);
}

.wow-facts {
  border-radius: var(--radius-md);
  border: 1px solid rgba(47, 95, 88, 0.42);
  background: linear-gradient(160deg, rgba(248, 252, 251, 0.96), rgba(232, 243, 239, 0.88));
  padding: 0.68rem 0.74rem;
}

.wow-facts ul {
  margin: 0.46rem 0 0;
  padding-left: 1rem;
  display: grid;
  gap: 0.34rem;
}

.wow-facts li {
  font-size: 0.9rem;
  line-height: 1.56;
}

.relation-main {
  margin: 0;
  font-size: 0.9rem;
}

.relation-arrow {
  margin: 0 0.17rem;
  color: var(--accent);
  font-weight: 700;
}

.scenario-choices {
  margin-top: 0.5rem;
  display: grid;
  gap: 0.34rem;
}

.scenario-choice {
  width: 100%;
  text-align: left;
  border-radius: 9px;
  border: 1px solid var(--stroke);
  background: #fff;
  color: var(--ink);
  padding: 0.46rem 0.54rem;
  font-size: 0.86rem;
  cursor: pointer;
}

.scenario-choice.selected {
  border-color: rgba(47, 95, 88, 0.62);
  background: var(--accent-soft);
}

.scenario-outcome {
  margin-top: 0.5rem;
  border-left: 3px solid rgba(47, 95, 88, 0.62);
  padding-left: 0.44rem;
  color: var(--ink-soft);
}

.lesson-reading {
  display: grid;
  gap: 0.52rem;
}

.lesson-reading p {
  margin: 0;
  line-height: 1.68;
  color: var(--ink-soft);
}

.mini-grid {
  margin-top: 0.86rem;
  display: grid;
  gap: 0.64rem;
  grid-template-columns: repeat(auto-fit, minmax(235px, 1fr));
}

.mini-card h3 {
  font-size: 0.95rem;
  margin-bottom: 0.38rem;
}

.mini-card ul {
  margin: 0.22rem 0 0;
  padding-left: 1rem;
}

.artwork-gallery,
.italy-tip {
  margin-top: 0.84rem;
  max-width: 88ch;
}

.artwork-grid {
  margin-top: 0.52rem;
  display: grid;
  gap: 0.58rem;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.artwork-card {
  display: flex;
  flex-direction: column;
  border-radius: var(--radius-sm);
  border: 1px solid var(--stroke);
  background: #fff;
  overflow: hidden;
}

.artwork-image-trigger {
  width: 100%;
  min-height: 220px;
  aspect-ratio: 4 / 3;
  display: grid;
  place-items: center;
  border: 0;
  padding: 0;
  background: linear-gradient(160deg, rgba(240, 241, 242, 0.92), rgba(226, 228, 231, 0.92));
  cursor: pointer;
}

.artwork-card img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: rgba(239, 240, 241, 0.94);
  display: block;
}

.artwork-fallback {
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  color: var(--ink-muted);
  background: linear-gradient(145deg, rgba(217, 220, 224, 0.78), rgba(242, 242, 241, 0.92));
}

.artwork-card-body {
  background: #fff;
  padding: 0.62rem 0.68rem;
}

.artwork-card-body h4 {
  font-size: 0.95rem;
}

.artwork-open-btn {
  margin-top: 0.42rem;
}

.artwork-card-body p {
  margin-top: 0.38rem;
  font-size: 0.88rem;
  line-height: 1.54;
}

.artwork-card-body h5 {
  margin: 0.44rem 0 0;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-family: "IBM Plex Mono", "SFMono-Regular", ui-monospace, monospace;
  color: var(--ink-muted);
}

.artwork-card-body ul {
  margin: 0.32rem 0 0;
  padding-left: 1rem;
  display: grid;
  gap: 0.24rem;
}

.artwork-card-body li {
  font-size: 0.86rem;
  line-height: 1.45;
}

.visual-library {
  margin-top: 0.85rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--stroke);
  background: rgba(250, 250, 249, 0.95);
  padding: 0.74rem;
  max-width: 88ch;
}

.visual-library-grid {
  margin-top: 0.58rem;
  display: grid;
  gap: 0.6rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.visual-card {
  border-radius: var(--radius-sm);
  border: 1px solid var(--stroke);
  background: #fff;
  overflow: hidden;
}

.visual-card-trigger {
  width: 100%;
  min-height: 180px;
  aspect-ratio: 4 / 3;
  display: grid;
  place-items: center;
  border: 0;
  padding: 0;
  background: linear-gradient(160deg, rgba(240, 241, 242, 0.92), rgba(226, 228, 231, 0.92));
  cursor: pointer;
}

.visual-card img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: rgba(239, 240, 241, 0.94);
  display: block;
}

.visual-card-body {
  padding: 0.52rem 0.6rem 0.64rem;
}

.visual-card-body h4 {
  font-size: 0.84rem;
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.visual-card-meta {
  margin-top: 0.28rem;
  font-size: 0.74rem;
  color: var(--ink-muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.visual-card-source {
  margin-top: 0.24rem;
  font-size: 0.7rem;
  color: var(--ink-muted);
  font-family: "IBM Plex Mono", "SFMono-Regular", ui-monospace, monospace;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.italy-tip {
  border-radius: var(--radius-md);
  border: 1px solid rgba(47, 95, 88, 0.45);
  background: linear-gradient(155deg, rgba(255, 255, 255, 0.97), rgba(233, 243, 240, 0.85));
  padding: 0.72rem 0.78rem;
}

.italy-tip h3 {
  font-size: 1rem;
}

.italy-tip p {
  margin-top: 0.36rem;
  font-size: 0.93rem;
  line-height: 1.58;
}

.resource-panel {
  margin-top: 0.85rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--stroke);
  background: rgba(249, 249, 248, 0.92);
  padding: 0.76rem;
}

.resource-grid {
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.resource-card {
  overflow: hidden;
}

.resource-card img {
  width: 100%;
  height: 160px;
  object-fit: contain;
  background: rgba(239, 240, 241, 0.94);
  display: block;
}

.resource-fallback {
  height: 160px;
  display: grid;
  place-items: center;
  background: linear-gradient(145deg, rgba(223, 227, 232, 0.72), rgba(242, 243, 244, 0.72));
  color: var(--ink-muted);
  font-size: 0.82rem;
}

.resource-card-body {
  padding: 0.62rem 0.68rem;
}

.resource-card-body h4 {
  font-size: 0.94rem;
}

.resource-card-description {
  margin: 0.2rem 0 0.28rem;
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.resource-card-body p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.52;
}

.resource-card-body a,
.resource-link {
  color: #1b3e63;
}

.resource-card-body a {
  display: inline-block;
  margin-top: 0.42rem;
  text-decoration-thickness: 1px;
}

.resource-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.42rem;
}

.resource-link {
  border-radius: 999px;
  border: 1px solid var(--stroke);
  background: #fff;
  padding: 0.32rem 0.56rem;
  font-size: 0.78rem;
  text-decoration: none;
}

.artwork-modal {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
}

.artwork-modal[hidden] {
  display: none;
}

.artwork-modal-backdrop {
  position: absolute;
  inset: 0;
  border: 0;
  background: rgba(10, 11, 12, 0.58);
}

.artwork-modal-card {
  position: relative;
  z-index: 1;
  width: min(860px, calc(100vw - 2rem));
  max-height: calc(100vh - 2rem);
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: #f8f8f7;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.32);
  overflow: auto;
}

.artwork-modal-close {
  position: sticky;
  top: 0.38rem;
  float: right;
  margin: 0.38rem 0.38rem 0 0;
  width: 34px;
  height: 34px;
  border-radius: 999px;
  border: 1px solid var(--stroke);
  background: #fff;
  color: var(--ink);
  font-size: 1.12rem;
  line-height: 1;
  cursor: pointer;
}

.artwork-modal-content {
  padding: 1rem 1rem 1.1rem;
}

.artwork-modal-header h3 {
  font-size: 1.18rem;
}

.artwork-modal-header p {
  margin-top: 0.22rem;
}

.artwork-modal-figure {
  margin: 0.76rem 0;
  border-radius: 14px;
  border: 1px solid var(--stroke);
  background: linear-gradient(160deg, rgba(240, 241, 242, 0.92), rgba(226, 228, 231, 0.92));
  overflow: hidden;
}

.artwork-modal-figure img {
  width: 100%;
  max-height: min(68vh, 620px);
  object-fit: contain;
  background: rgba(239, 240, 241, 0.94);
  display: block;
}

.image-fallback {
  display: grid;
  place-items: center;
  text-align: center;
  color: var(--ink-muted);
  background: linear-gradient(145deg, rgba(217, 220, 224, 0.78), rgba(242, 242, 241, 0.92));
  font-size: 0.78rem;
  font-family: "IBM Plex Mono", "SFMono-Regular", ui-monospace, monospace;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.8rem;
}

.image-fallback-media {
  width: 100%;
  height: 100%;
  min-height: 180px;
}

.hero-image-fallback {
  min-height: clamp(280px, 44vw, 560px);
}

.modal-image-fallback {
  min-height: 260px;
}

.artwork-modal-block {
  margin-top: 0.64rem;
}

.artwork-modal-block h4 {
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-family: "IBM Plex Mono", "SFMono-Regular", ui-monospace, monospace;
  color: var(--ink-muted);
}

.artwork-modal-block ul {
  margin: 0.35rem 0 0;
  padding-left: 1rem;
  display: grid;
  gap: 0.28rem;
}

body.modal-open {
  overflow: hidden;
}

.label {
  display: block;
  margin-top: 0.86rem;
  margin-bottom: 0.3rem;
  color: var(--ink-muted);
  font-size: 0.71rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

textarea,
select {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--stroke);
  background: #fff;
  color: var(--ink);
  padding: 0.6rem 0.7rem;
  font: inherit;
}

textarea:focus,
select:focus {
  outline: 2px solid rgba(48, 95, 123, 0.28);
  outline-offset: 1px;
}

.lesson-actions,
.journal-actions,
.quiz-config {
  margin-top: 0.8rem;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.46rem;
}

.primary-btn,
.ghost-btn {
  border-radius: 6px;
  border: 1px solid transparent;
  padding: 0.46rem 0.68rem;
  font-size: 0.69rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-family: "IBM Plex Mono", "SFMono-Regular", ui-monospace, monospace;
  line-height: 1;
  cursor: pointer;
  transition: 150ms ease;
}

.primary-btn {
  color: #fff;
  border-color: rgba(17, 18, 20, 0.3);
  background: #111214;
}

.primary-btn:hover,
.ghost-btn:hover {
  transform: translateY(-1px);
}

.primary-btn:disabled,
.ghost-btn:disabled,
.quiz-option:disabled,
.scenario-choice:disabled {
  opacity: 0.62;
  cursor: not-allowed;
  transform: none;
}

.ghost-btn {
  color: var(--ink-soft);
  border-color: var(--stroke);
  background: rgba(255, 255, 255, 0.58);
}

.lang-btn {
  min-width: 42px;
  text-align: center;
}

.lang-btn.active {
  color: #fff;
  border-color: rgba(17, 18, 20, 0.3);
  background: #111214;
}

.file-btn {
  display: inline-flex;
  align-items: center;
}

#importStateInput {
  display: none;
}

.timeline-track {
  margin-top: 0.82rem;
  display: grid;
  gap: 0.56rem;
}

.timeline-current-card {
  border-radius: 12px;
  border: 1px solid rgba(17, 18, 20, 0.32);
  background: linear-gradient(145deg, rgba(20, 23, 27, 0.94), rgba(32, 36, 41, 0.92));
  color: #fff;
  padding: 0.66rem 0.74rem;
}

.timeline-current-label {
  font-size: 0.67rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.74);
}

.timeline-current-title {
  margin-top: 0.12rem;
  font-weight: 700;
}

.timeline-current-meta {
  margin-top: 0.14rem;
  font-size: 0.84rem;
  color: rgba(255, 255, 255, 0.82);
}

.timeline-item {
  width: 100%;
  text-align: left;
  border-radius: 12px;
  border: 1px solid var(--stroke);
  background: linear-gradient(150deg, rgba(255, 255, 255, 0.98), rgba(248, 248, 247, 0.96));
  color: var(--ink);
  padding: 0.62rem 0.72rem;
  display: grid;
  gap: 0.1rem;
  cursor: pointer;
  transition: 150ms ease;
}

.timeline-item:hover {
  border-color: var(--stroke-strong);
  transform: translateX(2px);
}

.timeline-item.active {
  border-color: rgba(17, 18, 20, 0.4);
  background: linear-gradient(145deg, rgba(232, 238, 243, 0.95), rgba(249, 249, 249, 0.96));
}

.timeline-era {
  color: var(--ink-muted);
  font-size: 0.69rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.timeline-title {
  font-weight: 600;
}

.quiz-area {
  margin-top: 0.9rem;
  border-radius: var(--radius-md);
  border: 1px dashed var(--stroke-strong);
  background: rgba(255, 255, 255, 0.64);
  padding: 0.84rem;
  min-height: 180px;
}

.quiz-question {
  margin-top: 0.2rem;
  font-size: 1.02rem;
  font-weight: 700;
}

.quiz-options {
  margin-top: 0.72rem;
  display: grid;
  gap: 0.46rem;
}

.quiz-option {
  text-align: left;
  border-radius: 9px;
  border: 1px solid var(--stroke);
  background: #fff;
  color: var(--ink);
  padding: 0.52rem 0.62rem;
  cursor: pointer;
}

.quiz-option.correct {
  border-color: rgba(47, 95, 88, 0.72);
  background: rgba(47, 95, 88, 0.12);
}

.quiz-option.wrong {
  border-color: rgba(143, 61, 61, 0.58);
  background: rgba(143, 61, 61, 0.12);
}

.quiz-feedback {
  margin-top: 0.64rem;
  color: var(--ink-soft);
  font-size: 0.89rem;
}

.journal-layout {
  display: grid;
  gap: 0.74rem;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
}

.prompt-box {
  border-radius: 12px;
  border: 1px solid var(--stroke);
  background: rgba(255, 255, 255, 0.86);
  padding: 0.62rem 0.7rem;
  color: var(--ink-soft);
}

.journal-item {
  padding: 0.56rem 0;
  border-bottom: 1px dashed var(--stroke-strong);
}

.journal-item-date {
  display: block;
  font-size: 0.7rem;
  color: var(--ink-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.journal-item-text {
  margin-top: 0.12rem;
  white-space: pre-wrap;
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(8px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float-a {
  0%,
  100% {
    transform: translate(0, 0);
  }

  50% {
    transform: translate(-26px, 14px);
  }
}

@keyframes float-b {
  0%,
  100% {
    transform: translate(0, 0);
  }

  50% {
    transform: translate(28px, -12px);
  }
}

@media (max-width: 960px) {
  body {
    padding: 0.9rem;
  }

  .topbar {
    padding: 0.98rem;
    flex-direction: column;
  }

  .course-layout {
    grid-template-columns: 1fr;
  }

  .lesson-catalog {
    max-height: 42vh;
    overflow: auto;
  }

  .lesson-workspace {
    min-height: auto;
  }

  .view-nav {
    overflow-x: auto;
    flex-wrap: nowrap;
    scrollbar-width: thin;
    padding-bottom: 0.18rem;
  }

  .view-btn {
    flex: 0 0 auto;
  }

  .time-segment-strip {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 0.2rem;
    scrollbar-width: thin;
  }

  .time-segment {
    min-width: 190px;
  }
}

@media (max-width: 620px) {
  body {
    padding: 0.56rem;
  }

  h1 {
    font-size: 2.2rem;
  }

  .panel {
    padding: 0.72rem;
    border-radius: 14px;
  }

  .book-article,
  .resource-panel {
    padding: 0.66rem;
  }

  .topbar {
    padding: 0.78rem;
    gap: 0.66rem;
  }

  .subtitle {
    font-size: 0.95rem;
  }

  .topbar-controls {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.38rem;
  }

  .lang-switch {
    grid-column: 1 / -1;
  }

  .topbar-controls .ghost-btn,
  .topbar-controls .file-btn {
    width: 100%;
    justify-content: center;
  }

  .view-nav {
    gap: 0.38rem;
  }

  .view-btn {
    font-size: 0.66rem;
    padding: 0.42rem 0.6rem;
  }

  .course-layout {
    gap: 0.55rem;
  }

  .lesson-catalog {
    max-height: 34vh;
  }

  .lesson-item {
    padding: 0.5rem 0.54rem;
  }

  .lesson-head {
    align-items: flex-start;
  }

  .lesson-topic-wrap {
    width: 100%;
  }

  .time-position {
    padding: 0.62rem;
  }

  .time-era-summary {
    gap: 0.28rem;
  }

  .time-era-summary span {
    font-size: 0.68rem;
    padding: 0.16rem 0.44rem;
  }

  .time-segment {
    min-width: 168px;
    padding: 0.4rem 0.46rem;
  }

  .time-segment-title {
    font-size: 0.74rem;
  }

  .book-narrative p {
    font-size: 0.95rem;
    line-height: 1.68;
  }

  .artwork-grid {
    grid-template-columns: 1fr;
  }

  .visual-library-grid {
    grid-template-columns: 1fr;
  }

  .artwork-modal-card {
    width: calc(100vw - 1rem);
    max-height: calc(100vh - 1rem);
  }

  .artwork-modal-content {
    padding: 0.78rem;
  }
}