:root {
  --bg: #1e1e32;
  --button: #4682b4;
  --button-hover: #64a0d2;
  --button-text: #ffffff;
  --title: #dcdcff;
  --secondary: #325a82;
  --secondary-hover: #466e96;
  --back-button: #b44646;
  --back-button-hover: #d26464;
  --accent-red: #ff2a2a;
  --card: #282846;
  --card-highlight: #3c3c64;
  --border: #3c3c64;
  --input: #323250;
  --input-highlight: #46466e;
  --text: #e6e8f4;
  --text-muted: #c2c8e6;
  --water: #78b4dc;
  --header-height: 64px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

body.map-body {
  height: 100vh;
  overflow: hidden;
}

html,
body,
body * {
  cursor: url("/assets/map/cursor.png") 2 2, auto !important;
}

header {
  background: var(--bg);
  border-bottom: 1px solid var(--secondary);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav {
  max-width: 1600px;
  margin: 0 auto;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
}

.nav-main {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
  min-width: 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--title);
  font-size: 20px;
  font-weight: bold;
}

.brand-badge {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: var(--secondary);
  display: grid;
  place-items: center;
  color: var(--button-text);
  font-weight: bold;
  overflow: hidden;
  padding: 4px;
}

.brand-badge img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.nav-links {
  display: flex;
  flex-wrap: nowrap;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: thin;
  min-width: 0;
  flex: 1;
  justify-content: center;
}

.nav-links a {
  color: var(--button-text);
  text-decoration: none;
  font-size: 13px;
  padding: 6px 10px;
  border-radius: 8px;
  background: var(--button);
  border: 1px solid var(--card-highlight);
  white-space: nowrap;
  transition: background 0.2s ease;
}

.nav-links a:hover {
  background: var(--button-hover);
}

.nav-links a.active {
  background: var(--button-hover);
}

.nav-user {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

.nav-user .btn {
  font-size: 13px;
  padding: 6px 10px;
}

.nav-user .btn.secondary {
  background: var(--secondary);
}

.nav-icon-btn {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  padding: 0;
  border-radius: 8px;
  border: 1px solid var(--card-highlight);
  background: var(--button);
  color: var(--button-text);
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.nav-icon-btn svg {
  width: 14px;
  height: 14px;
}

.nav-icon-btn:hover {
  background: var(--button-hover);
}

.nav-icon-btn:focus-visible {
  outline: 2px solid var(--input-highlight);
  outline-offset: 2px;
}

.nav-icon-btn.is-disabled,
.nav-icon-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

.nav-fullscreen-btn {
  margin-left: 16px;
}

.pill {
  padding: 6px 10px;
  border-radius: 8px;
  background: var(--secondary);
  border: 1px solid var(--card-highlight);
  font-size: 13px;
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

main a {
  color: var(--button-text);
  text-decoration: underline;
}

main a:visited {
  color: var(--button-text);
}

main a.btn,
main a.menu-button,
main a.card-action,
main a.map-link,
main a.island-node {
  text-decoration: none;
  color: var(--button-text);
}

.hero {
  text-align: center;
  margin: 18px auto 28px;
  display: grid;
  gap: 10px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(32px, 4vw, 56px);
  color: var(--title);
}

.hero p {
  margin: 0;
  color: var(--text-muted);
}

.screen-title {
  text-align: center;
  color: var(--title);
  font-size: clamp(32px, 4vw, 56px);
  margin: 0;
}

.screen-subtitle {
  text-align: center;
  color: var(--text-muted);
  margin: 6px 0 0;
}

.anki-status {
  color: var(--text-muted);
  font-size: 14px;
}

.menu-list {
  display: grid;
  gap: 16px;
  width: min(340px, 90%);
  margin: 16px auto 0;
}

.menu-button {
  background: var(--button);
  color: var(--button-text);
  text-decoration: none;
  padding: 14px 16px;
  border-radius: 10px;
  border: 1px solid var(--card-highlight);
  font-size: 18px;
  text-align: center;
  width: 100%;
  transition: background 0.2s ease;
}

.menu-button:hover {
  background: var(--button-hover);
  box-shadow: inset 0 0 0 2px var(--accent-red);
}

.menu-list form {
  margin: 0;
}

button.menu-button {
  cursor: pointer;
}

.grid {
  display: grid;
  gap: 16px;
}

.grid.cols-3 {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.panel {
  background: var(--card);
  border: 1px solid var(--card-highlight);
  border-radius: 12px;
  padding: 16px;
}

.panel h3 {
  margin: 0 0 10px;
  color: var(--title);
  font-size: 18px;
}

.panel p {
  margin: 0 0 12px;
  color: var(--text-muted);
  font-size: 14px;
}

.prompt-block {
  background: var(--input);
  border: 1px solid var(--card-highlight);
  border-radius: 10px;
  padding: 12px;
  white-space: pre-wrap;
  font-family: "Courier New", Courier, monospace;
  font-size: 12px;
  color: var(--text);
}

.card-action {
  display: inline-block;
  margin-top: 8px;
  color: var(--button-text);
  text-decoration: none;
  background: var(--button);
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid var(--card-highlight);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 8px;
  border: 1px solid var(--card-highlight);
  padding: 8px 14px;
  background: var(--button);
  color: var(--button-text);
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s ease;
}

.btn:hover {
  background: var(--button-hover);
  box-shadow: inset 0 0 0 2px var(--accent-red);
}

.btn.secondary {
  background: var(--secondary);
}

.btn.secondary:hover {
  background: var(--secondary-hover);
  box-shadow: inset 0 0 0 2px var(--accent-red);
}

.btn.danger {
  background: var(--back-button);
}

.btn.danger:hover {
  background: var(--back-button-hover);
  box-shadow: inset 0 0 0 2px var(--accent-red);
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

form.inline {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

input, select, textarea {
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--card-highlight);
  background: var(--input);
  color: var(--text);
  font-family: inherit;
}

input:focus, select:focus, textarea:focus {
  outline: 2px solid var(--input-highlight);
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.table th, .table td {
  text-align: left;
  padding: 8px;
  border-bottom: 1px solid var(--card-highlight);
}

.table th {
  color: var(--title);
  font-weight: bold;
}

.tag {
  display: inline-flex;
  padding: 4px 8px;
  border-radius: 8px;
  background: var(--secondary);
  color: var(--button-text);
  font-size: 12px;
}

.message {
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--card);
  border: 1px solid var(--card-highlight);
  margin-bottom: 12px;
  text-align: center;
}

.split {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.pdf-library {
  display: grid;
  grid-template-columns: minmax(260px, 360px) minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}

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

.pdf-fields {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.pdf-fields select,
.pdf-fields input {
  flex: 1 1 160px;
  min-width: 160px;
}

.pdf-fields .btn {
  flex: 0 0 auto;
}

.file-input {
  width: 100%;
}

.file-input::file-selector-button {
  border: 1px solid var(--card-highlight);
  background: var(--secondary);
  color: var(--button-text);
  border-radius: 8px;
  padding: 6px 12px;
  margin-right: 10px;
  cursor: pointer;
}

.file-input::file-selector-button:hover {
  background: var(--secondary-hover);
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
}

@media (max-width: 900px) {
  .pdf-library {
    grid-template-columns: 1fr;
  }
}

.learning-card {
  background: var(--card);
  border: 2px solid var(--card-highlight);
  border-radius: 12px;
  padding: 20px;
  min-height: 200px;
  display: grid;
  align-content: center;
  text-align: center;
  font-size: 20px;
  color: var(--button-text);
}

.learning-meta {
  font-size: 13px;
  color: var(--text-muted);
}

.shack-hero {
  display: grid;
  gap: 12px;
  margin-bottom: 18px;
}

.shack-hero-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.shack-title {
  margin: 0;
  font-size: clamp(28px, 3.4vw, 42px);
  color: var(--title);
}

.shack-subtitle {
  color: var(--text-muted);
  font-size: 14px;
}

.shack-mode-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.shack-mode-link {
  background: var(--secondary);
  color: var(--button-text);
  border: 1px solid var(--card-highlight);
  border-radius: 10px;
  padding: 8px 12px;
  text-decoration: none;
  font-size: 14px;
  transition: background 0.2s ease;
}

.shack-mode-link:hover {
  background: var(--secondary-hover);
}

.shack-mode-link.is-active {
  background: var(--button-hover);
  box-shadow: 0 0 0 2px var(--accent-red);
}

.shack-content {
  display: grid;
  gap: 16px;
}

.shack-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  align-items: start;
}

.shack-stats {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
}

.shack-stat-label {
  color: var(--text-muted);
  font-size: 12px;
}

.shack-stat-value {
  font-size: 18px;
  font-weight: bold;
  color: var(--title);
}

.flashcard-form {
  margin: 0;
}

.flashcard-group {
  margin-bottom: 12px;
  display: grid;
  gap: 6px;
  max-width: 320px;
}

.flashcard-group label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.flashcard-empty.is-hidden,
.flashcard-active.is-hidden {
  display: none;
}

.flashcard-ratings {
  display: contents;
}

.flashcard-ratings.is-hidden {
  display: none;
}

.flashcard-card {
  width: 100%;
  min-height: clamp(240px, 40vh, 440px);
  display: grid;
  place-items: center;
  padding: 18px;
  border-radius: 14px;
  border: 2px solid var(--card-highlight);
  background: var(--card);
  text-align: center;
  font-size: clamp(18px, 2.4vw, 24px);
  line-height: 1.4;
  cursor: pointer;
  transition: transform 0.1s ease, border-color 0.1s ease, box-shadow 0.1s ease, background 0.1s ease;
  font-family: inherit;
  color: inherit;
  appearance: none;
  -webkit-appearance: none;
}

.flashcard-card.is-clicked,
.flashcard-card:active {
  background: var(--button-hover);
  border-color: var(--button-hover);
  box-shadow: 0 0 0 2px var(--button-hover);
  transform: translateY(-2px);
}

.flashcard-card:focus-visible {
  outline: 2px solid var(--button-hover);
  outline-offset: 2px;
}

.shack-card-actions {
  margin-top: 16px;
}

.typewriter-panel {
  display: grid;
  gap: 14px;
  --typewriter-font-size: 18px;
}

.typewriter-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.typewriter-label {
  font-size: 13px;
  color: var(--text-muted);
}

.typewriter-size-btn {
  padding: 6px 10px;
  font-size: 12px;
}

.typewriter-field {
  position: relative;
}

.typewriter-display {
  background: var(--input);
  border: 1px solid var(--card-highlight);
  border-radius: 12px;
  padding: 18px;
  height: clamp(220px, 36vh, 400px);
  overflow-y: auto;
  font-family: "Courier New", Courier, monospace;
  font-size: var(--typewriter-font-size);
  white-space: pre-wrap;
  line-height: 1.6;
  cursor: text;
}

.typewriter-field:focus-within .typewriter-display {
  border-color: var(--input-highlight);
  box-shadow: 0 0 0 1px var(--input-highlight);
}

.typewriter-input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  border: none;
  background: transparent;
  color: transparent;
  caret-color: transparent;
}

.typewriter-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-left: auto;
  color: var(--text-muted);
  font-size: 13px;
}

.typewriter-summary {
  background: var(--card);
  border: 1px solid var(--card-highlight);
  border-radius: 10px;
  padding: 8px 10px;
  font-size: 13px;
  margin-left: auto;
  min-width: 200px;
  text-align: right;
}

.typewriter-summary.is-hidden {
  display: none;
}

.typewriter-actions {
  justify-content: flex-start;
}

.typewriter-char {
  color: var(--text);
}

.typewriter-char.is-correct {
  color: #9fe88c;
}

.typewriter-char.is-wrong {
  color: #ff9a9a;
  text-decoration: underline;
}

.typewriter-char.is-current {
  background: rgba(255, 255, 255, 0.12);
  border-bottom: 2px solid var(--accent-red);
}

.exam-panel {
  margin-top: 16px;
}

.panel .exam-meta {
  margin-top: 72px;
  padding-top: 0;
}

.exam-panel .btn-row {
  display: grid;
  grid-template-columns: 1fr;
  margin-top: 12px;
}

.exam-panel .btn-row .btn {
  width: 100%;
}

.exam-setup-input {
  width: 88px;
  padding: 6px 8px;
}

.exam-header-left {
  display: grid;
  gap: 6px;
}

.exam-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.exam-timer {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--card);
  border: 1px solid var(--card-highlight);
  font-size: 12px;
  color: var(--text-muted);
}

.exam-timer span {
  font-weight: bold;
  color: var(--title);
}

.exam-timer.is-low {
  border-color: var(--accent-red);
  color: var(--accent-red);
}

.exam-timer.is-low span {
  color: var(--accent-red);
}

.exam-questions {
  display: grid;
  gap: 12px;
}

.exam-question {
  background: var(--card);
  border: 1px solid var(--card-highlight);
  border-radius: 12px;
  padding: 12px 14px;
  display: grid;
  gap: 8px;
}

.exam-question-text {
  font-weight: bold;
  color: var(--title);
}

.exam-answer-label {
  display: grid;
  gap: 6px;
  font-size: 13px;
  color: var(--text-muted);
}

.exam-answer-input {
  width: 100%;
}

.exam-question.is-hidden {
  display: none;
}

.exam-progress {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.exam-progress-label {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 11px;
}

.exam-question-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-muted);
}

.exam-options {
  display: grid;
  gap: 8px;
}

.exam-option {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 10px;
  background: var(--input);
  border: 1px solid var(--card-highlight);
  font-size: 13px;
}

.exam-option input {
  accent-color: var(--accent-red);
}

.exam-nav {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.exam-nav .btn {
  flex: 1 1 120px;
}

.exam-nav .is-hidden {
  display: none;
}

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

.exam-setup-panel {
  position: relative;
  overflow: hidden;
}

.exam-loading {
  position: absolute;
  inset: 0;
  background: rgba(10, 12, 16, 0.6);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: var(--title);
  font-size: 14px;
  backdrop-filter: blur(2px);
}

.exam-loading.is-hidden {
  display: none;
}

.exam-info-note {
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-muted);
}

.exam-job-row td {
  opacity: 0.8;
}

.exam-spinner {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 3px solid rgba(255, 255, 255, 0.2);
  border-top-color: var(--accent-red);
  animation: exam-spin 1s linear infinite;
}

@keyframes exam-spin {
  to {
    transform: rotate(360deg);
  }
}

.exam-setup-table th {
  width: 140px;
  text-align: left;
  font-size: 13px;
  color: var(--text-muted);
}

.exam-setup-table td {
  vertical-align: top;
}

.exam-setup-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.exam-type-grid {
  display: grid;
  gap: 8px;
  border: 1px solid var(--card-highlight);
  border-radius: 12px;
  padding: 10px 12px;
  background: var(--card);
}

.exam-type-grid legend {
  padding: 0 6px;
  font-size: 12px;
  color: var(--text-muted);
}

.exam-type-option {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text);
}

.exam-regenerate {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
}

.exam-time-input {
  display: grid;
  gap: 4px;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.exam-ranking {
  display: grid;
  gap: 8px;
}

.exam-ranking-list {
  display: grid;
  gap: 8px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.exam-ranking-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--input);
  border: 1px solid var(--card-highlight);
  font-size: 13px;
}

.exam-ranking-actions {
  display: flex;
  gap: 6px;
}

.exam-ranking-actions .btn {
  padding: 4px 8px;
  font-size: 12px;
}

.exam-matching {
  display: grid;
  gap: 10px;
}

.exam-matching-row {
  display: grid;
  grid-template-columns: 1fr 180px;
  gap: 12px;
  align-items: center;
}

.exam-match-left {
  font-size: 13px;
  color: var(--text);
}

.exam-results {
  margin-bottom: 16px;
}

.exam-review-summary {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.exam-result-item {
  border: 1px solid var(--card-highlight);
  border-radius: 12px;
  padding: 12px 14px;
  margin-top: 10px;
  background: var(--card);
  display: grid;
  gap: 6px;
}

.exam-result-item.is-correct {
  border-color: rgba(120, 216, 120, 0.5);
}

.exam-result-item.is-incorrect {
  border-color: rgba(255, 120, 120, 0.6);
}

.exam-result-meta {
  display: flex;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.exam-review-flashcards {
  margin-top: 8px;
  display: grid;
  gap: 8px;
}

.exam-review-flashcard {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.exam-review-flashcard-label {
  font-size: 12px;
  color: var(--text-muted);
}

.exam-action-stack {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.exam-action-stack form {
  margin: 0;
}

@media (max-width: 720px) {
  .exam-matching-row {
    grid-template-columns: 1fr;
  }
}

.btn.is-disabled {
  opacity: 0.6;
  pointer-events: none;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 8px;
  background: var(--secondary);
  border: 1px solid var(--card-highlight);
  font-size: 12px;
}

.pdf-preview {
  border-radius: 12px;
  border: 1px solid var(--card-highlight);
  background: var(--input);
  width: 100%;
  min-height: 420px;
}

.pdf-preview-compact {
  min-height: 320px;
}

.chapter-preview-grid {
  display: grid;
  gap: 12px;
}

.chapter-preview {
  background: var(--card);
  border: 1px solid var(--card-highlight);
  border-radius: 12px;
  padding: 12px 14px;
}

.chapter-preview summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.chapter-preview summary::-webkit-details-marker {
  display: none;
}

.chapter-preview-title {
  font-weight: bold;
  color: var(--title);
}

.chapter-preview-meta {
  color: var(--text-muted);
  font-size: 12px;
}

.chapter-preview-body {
  margin-top: 12px;
  display: grid;
  gap: 12px;
}

.auth-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 30px;
}

.auth-card {
  width: min(420px, 90vw);
  background: var(--card);
  border: 1px solid var(--card-highlight);
  border-radius: 12px;
  padding: 20px;
}

.auth-card h2 {
  margin-top: 0;
  color: var(--title);
}

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

.map-shell {
  display: grid;
  gap: 18px;
}

.map-ui {
  z-index: 4;
  pointer-events: auto;
}

.island-map {
  position: relative;
  width: 100%;
  height: 100%;
  background: var(--water);
  border: none;
  border-radius: 0;
  overflow: hidden;
}

.map-layer {
  position: absolute;
  inset: 0;
  z-index: 1;
  transform: translate(0px, 0px);
  transform-origin: 0 0;
  will-change: transform;
}

.map-connector {
  position: absolute;
  transform: translate(-50%, -50%) rotate(var(--conn-rot, 0deg)) scaleX(var(--conn-flip, 1));
  display: block;
  pointer-events: none;
  user-select: none;
  z-index: 0;
  object-fit: contain;
  image-rendering: auto;
  image-rendering: -webkit-optimize-contrast;
}

.is-move-mode .map-connector {
  pointer-events: auto;
  cursor: move;
}

.island-node {
  position: absolute;
  transform: translate(-50%, -50%);
  width: 130px;
  height: 130px;
  z-index: 2;
  background: url("/assets/map/island.png") center / contain no-repeat;
  display: grid;
  place-items: center;
  text-align: center;
  color: var(--button-text);
  font-weight: bold;
  text-shadow: 0 2px 6px rgba(0, 0, 0, 0.6);
  text-decoration: none;
  transition: transform 0.2s ease;
  padding: 12px;
  white-space: normal;
  image-rendering: auto;
  image-rendering: -webkit-optimize-contrast;
  border: none;
  background-color: transparent;
  font-family: inherit;
}

.island-node:hover {
  transform: translate(-50%, -50%) scale(1.05);
  filter:
    drop-shadow(0 0 0 var(--accent-red))
    drop-shadow(2px 0 0 var(--accent-red))
    drop-shadow(-2px 0 0 var(--accent-red))
    drop-shadow(0 2px 0 var(--accent-red))
    drop-shadow(0 -2px 0 var(--accent-red));
}

.island-node.is-disabled {
  cursor: default;
}

.island-node.island-action {
  cursor: pointer;
}

.island-map.is-move-mode .island-node {
  cursor: move;
}

.island-node:focus-visible,
.map-tab:focus-visible,
.slide-tab:focus-visible,
.btn:focus-visible,
.menu-button:focus-visible,
.map-link:focus-visible {
  outline: 2px solid var(--accent-red);
  outline-offset: 2px;
}

.map-body main {
  max-width: none;
  padding: 0;
  height: calc(100vh - var(--header-height));
  min-height: calc(100vh - var(--header-height));
  overflow: hidden;
}

.map-full {
  height: 100%;
  padding: 0;
}

.map-title {
  position: absolute;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  font-size: clamp(28px, 4vw, 48px);
  color: var(--title);
  font-weight: bold;
  text-shadow: 0 4px 0 rgba(0, 0, 0, 0.95), 0 0 12px rgba(0, 0, 0, 0.85);
}

.map-subtitle {
  position: absolute;
  top: 62px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--text-muted);
  text-shadow: 0 2px 0 rgba(0, 0, 0, 0.8);
  font-size: 14px;
}

.map-side {
  position: absolute;
  left: 0;
  top: 37.5%;
  transform: translateY(-50%);
  display: grid;
  gap: 10px;
}

.map-side-right {
  position: absolute;
  right: 0;
  top: 37.5%;
  transform: translateY(-50%);
  display: grid;
  gap: 10px;
}

.map-side form {
  margin: 0;
}

.map-tab {
  background: var(--secondary);
  color: var(--button-text);
  border: 1px solid var(--card-highlight);
  border-radius: 0 12px 12px 0;
  padding: 14px 16px;
  font-size: 16px;
  cursor: pointer;
  text-align: left;
  width: 220px;
}

.map-tab:hover {
  background: var(--secondary-hover);
  box-shadow: inset 0 0 0 2px var(--accent-red);
}

.slide-tab {
  width: 72px;
  min-width: 72px;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 6px;
  overflow: hidden;
  transition: width 0.2s ease, background 0.2s ease;
}

.slide-tab .slide-word {
  display: inline-flex;
  align-items: center;
  font-weight: bold;
  font-size: 16px;
  letter-spacing: 0.8px;
}

.slide-tab .slide-rest {
  display: inline-block;
  max-width: 0;
  overflow: hidden;
  white-space: nowrap;
  transition: max-width 0.25s ease;
  font-size: 16px;
  letter-spacing: 0.8px;
  font-weight: bold;
}

.slide-tab:hover {
  width: auto;
  min-width: 72px;
  max-width: 240px;
}

.slide-tab:hover .slide-rest {
  max-width: 160px;
}

.slide-tab-right {
  border-radius: 12px 0 0 12px;
  margin-left: auto;
  justify-content: flex-end;
  text-align: right;
  flex-direction: row;
  overflow: hidden;
  width: 72px;
  min-width: 72px;
  padding: 14px 12px;
}

.slide-tab-right.is-active,
.slide-tab-right.is-active:hover {
  background: var(--button-hover);
  box-shadow: inset 0 0 0 2px var(--accent-red);
}

.slide-tab-right .slide-icon {
  margin-left: 0;
  margin-right: 0;
  order: 0;
  flex: 0 0 auto;
}

.slide-tab-right .slide-rest {
  order: 1;
}

.slide-tab-right:hover {
  width: auto;
  min-width: 72px;
  max-width: 240px;
}

.slide-tab-right:hover .slide-rest {
  max-width: 160px;
}

.gear-icon {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  background: rgba(0, 0, 0, 0.25);
  border-radius: 8px;
  padding: 4px;
}

.map-timer {
  position: absolute;
  min-width: 200px;
  max-width: 300px;
  background: var(--card);
  border: 1px solid var(--card-highlight);
  border-radius: 10px;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.35);
  z-index: 8;
  color: var(--text);
  user-select: none;
  cursor: default;
}

.map-timer.is-hidden {
  display: none;
}

.map-timer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-bottom: 1px solid var(--card-highlight);
  cursor: move;
  gap: 10px;
}

.map-timer-title {
  font-weight: bold;
  font-size: 15px;
  letter-spacing: 0.8px;
}

.map-timer-close {
  width: 26px;
  height: 26px;
  border: none;
  border-radius: 6px;
  background: var(--secondary);
  color: var(--button-text);
  cursor: pointer;
}

.map-timer-close:hover {
  background: var(--secondary-hover);
}

.map-timer-body {
  padding: 10px 12px 12px;
  display: grid;
  gap: 8px;
}

.map-timer-alarm {
  display: none;
  padding: 16px;
}

.map-timer-alarm-btn {
  width: 100%;
  padding: 16px;
  font-size: 18px;
  justify-content: center;
}

.map-timer-display {
  font-size: 22px;
  font-weight: bold;
  letter-spacing: 1px;
}

.map-timer-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.map-timer-btn {
  padding: 6px 10px;
  font-size: 12px;
}

.map-timer.is-alarming .map-timer-body {
  display: none;
}

.map-timer.is-alarming .map-timer-alarm {
  display: flex;
}

.map-music {
  position: absolute;
  min-width: 200px;
  max-width: 300px;
  width: 200px;
  background: var(--card);
  border: 1px solid var(--card-highlight);
  border-radius: 10px;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.35);
  z-index: 8;
  color: var(--text);
  user-select: none;
  cursor: default;
}

.map-music.is-hidden {
  display: none;
}

.map-music-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-bottom: 1px solid var(--card-highlight);
  cursor: move;
  gap: 10px;
}

.map-music-title {
  font-weight: bold;
  font-size: 15px;
  letter-spacing: 0.8px;
}

.map-music-close {
  width: 26px;
  height: 26px;
  border: none;
  border-radius: 6px;
  background: var(--secondary);
  color: var(--button-text);
  cursor: pointer;
}

.map-music-close:hover {
  background: var(--secondary-hover);
}

.map-music-body {
  padding: 10px 12px 12px;
  display: grid;
  gap: 8px;
}

.map-music-controls {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.map-music-btn {
  padding: 6px 10px;
  font-size: 12px;
}

.map-music-volume {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-muted);
}

.map-music-slider {
  flex: 0 0 90px;
  width: 90px;
}

.map-music audio {
  display: none;
}

.map-calc {
  position: absolute;
  min-width: 220px;
  max-width: 320px;
  background: var(--card);
  border: 1px solid var(--card-highlight);
  border-radius: 10px;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.35);
  z-index: 8;
  color: var(--text);
  user-select: none;
  overflow: hidden;
}

.map-calc.is-hidden {
  display: none;
}

.map-calc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-bottom: 1px solid var(--card-highlight);
  cursor: move;
  gap: 10px;
}

.map-calc-title {
  font-weight: bold;
  font-size: 15px;
  letter-spacing: 0.8px;
}

.map-calc-close {
  width: 26px;
  height: 26px;
  border: none;
  border-radius: 6px;
  background: var(--secondary);
  color: var(--button-text);
  cursor: pointer;
}

.map-calc-close:hover {
  background: var(--secondary-hover);
}

.map-calc-body {
  padding: 10px 12px 12px;
  display: grid;
  gap: 8px;
}

.map-calc-display {
  background: var(--input);
  border: 1px solid var(--card-highlight);
  border-radius: 8px;
  padding: 10px;
  font-size: 18px;
  font-weight: bold;
  letter-spacing: 0.5px;
  text-align: right;
  min-height: 42px;
  overflow: hidden;
}

.map-calc-grid {
  display: grid;
  gap: 6px;
}

.map-calc-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 6px;
}

.map-calc-row:last-child {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.map-calc-btn {
  padding: 8px;
  font-size: 13px;
}
.map-timer-input {
  width: 82px;
  padding: 6px 8px;
  border-radius: 8px;
  border: 1px solid var(--card-highlight);
  background: var(--input);
  color: var(--text);
  font-family: inherit;
  font-size: 12px;
}

.shack-tab {
  width: 140px;
  min-height: 110px;
  padding: 14px 10px 14px 16px;
  gap: 12px;
  overflow: hidden;
  transition: width 0.12s ease, background 0.2s ease;
}

.shack-tab:hover {
  width: 320px;
}

.shack-tab .slide-icon {
  width: 84px;
  height: 84px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  transition: none;
  margin-right: 0;
  margin-left: 0;
}

.shack-tab:hover .slide-icon {
  width: 84px;
  height: 84px;
  transform: none;
  margin-left: 0;
}

.shack-tab .slide-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  image-rendering: auto;
  image-rendering: -webkit-optimize-contrast;
}

.shack-tab .slide-rest {
  max-width: 0;
  overflow: hidden;
  white-space: nowrap;
  font-size: 22px;
  font-weight: bold;
  transition: max-width 0.25s ease;
}

.shack-tab:hover .slide-rest {
  max-width: 480px;
}

.map-links {
  position: absolute;
  left: 18px;
  top: 18px;
  display: flex;
  gap: 10px;
}

.map-link {
  background: var(--back-button);
  color: var(--button-text);
  border: 1px solid var(--card-highlight);
  border-radius: 10px;
  padding: 8px 12px;
  text-decoration: none;
}

.map-link:hover {
  background: var(--back-button-hover);
  box-shadow: inset 0 0 0 2px var(--accent-red);
}

.map-empty {
  position: absolute;
  left: 50%;
  top: 55%;
  transform: translate(-50%, -50%);
  background: var(--card);
  border: 1px solid var(--card-highlight);
  padding: 12px 16px;
  border-radius: 10px;
  color: var(--text-muted);
}

.island-label {
  font-size: 14px;
  line-height: 1.2;
}

.island-category .island-label,
.island-subcategory .island-label,
.island-pdf .island-label {
  font-size: clamp(36px, 4.8vw, 56px);
}

.island-category {
  width: 420px;
  height: 420px;
  background-image: url("/assets/map/island.png");
}

.island-subcategory {
  width: 420px;
  height: 420px;
  background-image: url("/assets/map/island_category.png");
}

.island-pdf {
  width: 420px;
  height: 420px;
  background-image: url("/assets/map/island_subcategory.png");
}

.island-chapter {
  width: 120px;
  height: 120px;
  background-image: url("/assets/map/island_chapter.png");
}

.island-shack {
  width: 240px;
  height: 240px;
  background-image: url("/assets/map/shack.png");
}

.map-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: grid;
  place-items: center;
  z-index: 5;
}

.map-modal-backdrop.is-hidden {
  display: none;
}

.shack-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: grid;
  place-items: center;
  z-index: 6;
}

.shack-overlay.is-hidden {
  display: none;
}

.shack-overlay-backdrop {
  position: absolute;
  inset: 0;
}

.reader-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  display: grid;
  place-items: center;
  z-index: 7;
}

.reader-overlay.is-hidden {
  display: none;
}

.reader-overlay-backdrop {
  position: absolute;
  inset: 0;
}

.reader-overlay-panel {
  position: relative;
  width: min(1400px, 96vw);
  height: min(860px, 90vh);
  background: var(--bg);
  border: 2px solid var(--secondary);
  border-radius: 16px;
  padding: 16px 18px 18px;
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.35);
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 12px;
  overflow: hidden;
}

.reader-overlay-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.reader-overlay-title {
  font-size: clamp(24px, 3vw, 34px);
  font-weight: bold;
  color: var(--title);
}

.reader-overlay-subtitle {
  color: var(--text-muted);
  font-size: 13px;
  margin-top: 2px;
}

.reader-overlay-close {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  border: none;
  background: #c82828;
  color: #fff;
  font-weight: bold;
  cursor: pointer;
}

.reader-overlay-close:hover {
  background: #aa1e1e;
}

.reader-overlay-body {
  position: relative;
  border-radius: 12px;
  background: var(--card);
  border: 1px solid var(--card-highlight);
  overflow: hidden;
  display: grid;
}

.reader-embed {
  width: 100%;
  height: 100%;
  border: none;
  background: #111111;
}

.reader-empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 24px;
  color: var(--text-muted);
  background: var(--bg);
  z-index: 1;
}

.reader-empty.is-hidden {
  display: none;
}

.shack-overlay-panel {
  position: relative;
  width: min(1320px, 98vw);
  height: min(760px, 86vh);
  max-height: 90vh;
  background: var(--bg);
  border: 2px solid var(--secondary);
  border-radius: 16px;
  padding: 16px 22px 20px;
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.35);
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 12px;
  overflow: hidden;
}

.shack-overlay-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding-bottom: 8px;
}

.shack-overlay-title {
  font-size: clamp(24px, 3.4vw, 32px);
  font-weight: bold;
  color: var(--title);
}

.shack-overlay-subtitle {
  color: var(--text-muted);
  font-size: 13px;
  margin-top: 2px;
}

.shack-overlay-close {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  border: none;
  background: #c82828;
  color: #fff;
  font-weight: bold;
  cursor: pointer;
  margin-top: 2px;
}

.shack-overlay-close:hover {
  background: #aa1e1e;
}

.shack-overlay-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow: visible;
  min-height: 0;
}

.shack-menu {
  flex: 1 1 auto;
  display: grid;
  place-items: center;
}

.shack-mode-grid {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  align-content: start;
  align-items: start;
  justify-items: center;
  width: min(900px, 100%);
}

.shack-mode-card {
  position: relative;
  background-color: transparent;
  border: none;
  border-radius: 14px;
  padding: 0;
  text-align: center;
  display: grid;
  place-items: center;
  gap: 0;
  aspect-ratio: 1 / 1;
  max-width: 320px;
  width: 100%;
  color: var(--text);
  cursor: pointer;
  font-family: inherit;
  text-decoration: none;
  appearance: none;
  transition: transform 0.2s ease, filter 0.2s ease;
}

.shack-mode-card-interactive {
  background-repeat: no-repeat;
  background-position: center;
  background-size: 100%;
}

.shack-mode-flashcards {
  background-image: url("/assets/map/flashcard_image_icon.png");
}

.shack-mode-typewriter {
  background-image: url("/assets/map/typewriter_image_icon.png");
}

.shack-mode-exam {
  background-image: url("/assets/map/practice_exam_image_icon.png");
}

.shack-mode-card.is-active {
  filter:
    drop-shadow(0 0 0 var(--accent-red))
    drop-shadow(2px 0 0 var(--accent-red))
    drop-shadow(-2px 0 0 var(--accent-red))
    drop-shadow(0 2px 0 var(--accent-red))
    drop-shadow(0 -2px 0 var(--accent-red));
}

.shack-mode-card-interactive:hover {
  transform: translateY(-2px);
  filter:
    drop-shadow(0 0 0 var(--accent-red))
    drop-shadow(2px 0 0 var(--accent-red))
    drop-shadow(-2px 0 0 var(--accent-red))
    drop-shadow(0 2px 0 var(--accent-red))
    drop-shadow(0 -2px 0 var(--accent-red));
}

.shack-mode-card-interactive:focus-visible {
  outline: none;
  filter:
    drop-shadow(0 0 0 var(--accent-red))
    drop-shadow(2px 0 0 var(--accent-red))
    drop-shadow(-2px 0 0 var(--accent-red))
    drop-shadow(0 2px 0 var(--accent-red))
    drop-shadow(0 -2px 0 var(--accent-red));
}

.shack-mode-content {
  flex: 1 1 auto;
  overflow-y: auto;
  min-height: 0;
  padding: 4px 8px 8px 4px;
}

.shack-mode-panel.is-hidden {
  display: none;
}

.shack-session.is-hidden {
  display: none;
}

.shack-overlay.is-menu .shack-mode-content {
  display: none;
}

.shack-overlay.is-mode .shack-menu {
  display: none;
}

.shack-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.shack-panel-title {
  font-size: 18px;
  font-weight: bold;
  color: var(--title);
}


.map-menu {
  background: var(--bg);
  border: 2px solid var(--secondary);
  border-radius: 14px;
  padding: 20px;
  width: min(520px, 90vw);
  text-align: center;
  box-shadow: 0 10px 0 rgba(0, 0, 0, 0.35), 0 18px 30px rgba(0, 0, 0, 0.3);
  max-height: 90vh;
  overflow-y: auto;
}

.map-menu-header {
  position: relative;
  min-height: 56px;
  display: grid;
  place-items: center;
  margin-bottom: 14px;
}

.map-menu-title {
  font-size: clamp(18px, 2.6vw, 26px);
  font-weight: bold;
  color: #ebf0f8;
  text-shadow: 0 2px 0 rgba(0, 0, 0, 0.7);
}

.map-menu-close {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: #c82828;
  color: #ffffff;
  display: grid;
  place-items: center;
  text-decoration: none;
  font-size: 18px;
  font-weight: bold;
  line-height: 1;
}

.map-menu-close:hover {
  background: #aa1e1e;
}

.map-menu-buttons {
  display: grid;
  gap: 12px;
}

.map-menu-btn {
  height: 60px;
  border-radius: 10px;
  border: 1px solid var(--secondary);
  background: #2c3444;
  color: #ebf0f8;
  font-weight: bold;
  font-size: clamp(16px, 2.2vw, 20px);
  display: grid;
  place-items: center;
  text-decoration: none;
  padding: 0 12px;
  cursor: pointer;
}

.map-menu-btn:hover {
  background: #4c6896;
  color: #ffffff;
}

.map-menu-btn.is-disabled,
.map-menu-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

.map-menu-btn.is-disabled:hover,
.map-menu-btn:disabled:hover {
  background: #2c3444;
  color: #ebf0f8;
}

@media (max-width: 900px) {
  .nav {
    flex-direction: column;
    align-items: flex-start;
  }
  .nav-main {
    width: 100%;
  }
  .nav-links {
    width: 100%;
    justify-content: flex-start;
  }
  .nav-user {
    margin-left: 0;
  }
  .nav-fullscreen-btn {
    margin-left: 0;
    align-self: flex-end;
  }
}

@media (max-width: 720px) {
  .island-node {
    width: 90px;
    height: 90px;
    font-size: 12px;
  }
  .island-category,
  .island-subcategory,
  .island-pdf,
  .island-chapter,
  .island-shack {
    width: 190px;
    height: 190px;
  }
  .map-side {
    position: static;
    margin: 16px;
  }
  .map-tab {
    width: 100%;
  }
  .map-title {
    position: static;
    transform: none;
    text-align: center;
    padding-top: 16px;
  }
  .map-subtitle {
    position: static;
    transform: none;
    text-align: center;
    margin-bottom: 8px;
  }
  .map-links {
    position: static;
    margin: 0 16px 12px;
  }
  .map-menu {
    width: 92vw;
    padding: 16px;
  }
  .map-menu-header {
    min-height: 48px;
    margin-bottom: 12px;
  }
  .map-menu-btn {
    height: 52px;
    font-size: 15px;
  }
}