:root {
  --bg: #fafafa;
  --text: #1f2328;
  --muted: #57606a;
  --accent: #2454ff;
  --accent-hover: #1a40cc;
  --accent-soft: #eef4ff;
  --card-bg: #ffffff;
  --border: #e2e5e9;
  --hover-tint: #f5f7ff;
  --success-bg: #d8ffd8;
  --success-border: #4caf50;
  --error-bg: #ffd8d8;
  --error-border: #f44336;
  --progress-bg: #ececec;
  --max-width: 760px;
}

.term-figure {
  margin: 1.5em 0;
  padding: 1em;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  text-align: center;
}
.term-figure svg {
  max-width: 100%;
  height: auto;
}
.term-figure img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
}
.term-figure figcaption {
  margin-top: 0.6em;
  font-size: 0.85em;
  color: var(--muted);
}

:root[data-theme="dark"] {
  --bg: #14171a;
  --text: #e6edf3;
  --muted: #9aa4af;
  --accent: #6ea8ff;
  --accent-hover: #4c8ce0;
  --accent-soft: #1e2a44;
  --card-bg: #1c2128;
  --border: #30363d;
  --hover-tint: #1e2733;
  --success-bg: #16321c;
  --success-border: #3fa84c;
  --error-bg: #3a1b1b;
  --error-border: #e05353;
  --progress-bg: #2a2f36;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Malgun Gothic", "Apple SD Gothic Neo", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

header.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--card-bg);
}

.site-header .inner {
  /* Wider than the page's content column (--max-width) on purpose: at
     content width the logo + a readable search box + the full nav can't
     coexist in one row without squeezing the search box down to nothing. */
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.menu-toggle{
    display:none;
    background:none;
    border:none;
    font-size:28px;
    cursor:pointer;
    color:var(--text);
}

.theme-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  padding: 0;
  font-size: 1.1rem;
  line-height: 1;
  background: none;
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
  flex-shrink: 0;
}

.theme-toggle-btn:hover {
  border-color: var(--accent);
}

.theme-icon-dark {
  display: none;
}

:root[data-theme="dark"] .theme-icon-light {
  display: none;
}

:root[data-theme="dark"] .theme-icon-dark {
  display: inline;
}

.site-header a.logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  text-decoration: none;
}

.site-header nav{
    display:flex;
    align-items:center;
    flex-shrink:0;
}

.site-header nav a {
  margin-left: 16px;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  white-space: nowrap;
  flex-shrink: 0;
}

.site-header nav a:hover { color: var(--accent); }

.nav-dropdown {
  position: relative;
  margin-left: 16px;
}

.nav-dropdown-toggle {
  background: none;
  border: none;
  padding: 0;
  margin: 0;
  font: inherit;
  color: var(--muted);
  font-size: 0.9rem;
  cursor: pointer;
  white-space: nowrap;
}

.nav-dropdown-toggle:hover,
.nav-dropdown.open .nav-dropdown-toggle {
  color: var(--accent);
}

.nav-dropdown-menu {
  display: none;
  flex-direction: column;
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 120px;
  padding: 6px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
  z-index: 30;
}

.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown.open .nav-dropdown-menu {
  display: flex;
}

.nav-dropdown-menu a {
  margin: 0;
  padding: 8px 10px;
  border-radius: 6px;
}

.nav-dropdown-menu a:hover {
  background: var(--hover-tint);
}

.header-search {
  position: relative;
  flex: 1 1 380px;
  min-width: 0;
  margin: 0 16px;
}

.header-search-input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
  background: var(--bg);
  color: var(--text);
}

.header-search-input:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--card-bg);
}

.category-page-filter {
  display: block;
  width: 100%;
  max-width: 420px;
  padding: 10px 14px;
  margin: 16px 0 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
  background: var(--bg);
  color: var(--text);
}

.category-page-filter:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--card-bg);
}

.header-search-results {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  z-index: 20;
  margin: 0;
  padding: 4px;
  list-style: none;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
  max-height: 320px;
  overflow-y: auto;
}

.header-search-results li a {
  display: block;
  padding: 8px 10px;
  border-radius: 6px;
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
}

.header-search-results li a:hover,
.header-search-results li a:focus {
  background: var(--bg);
  color: var(--accent);
  outline: none;
}

.header-search-results li a .term-search-tag {
  display: block;
  font-size: 0.75rem;
  color: var(--muted);
  margin-top: 2px;
}

.header-search-results li.recent-search-item {
  display: block;
  padding: 8px 10px;
  border-radius: 6px;
  color: var(--muted);
  font-size: 0.9rem;
  cursor: pointer;
}

.header-search-results li.recent-search-item::before {
  content: "🕘 ";
}

.header-search-results li.recent-search-item:hover {
  background: var(--bg);
  color: var(--accent);
}

@media (max-width: 640px) {
  .site-header .inner {
    flex-wrap: wrap;
    row-gap: 10px;
  }

  .header-search {
    order: 3;
    flex: 1 1 100%;
    margin: 0;
  }
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px 20px 60px;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-width: 480px;
  margin-top: 24px;
}

.contact-form label {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 10px;
}

.contact-form input,
.contact-form textarea {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-family: inherit;
  font-size: 0.95rem;
  background: var(--card-bg);
  color: var(--text);
}

.contact-form textarea {
  min-height: 140px;
  resize: vertical;
}

.contact-form button {
  margin-top: 16px;
  align-self: flex-start;
  padding: 10px 24px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 0.95rem;
  cursor: pointer;
}

.contact-form button:disabled {
  background: var(--muted);
  cursor: not-allowed;
}

#contact-status {
  margin-top: 4px;
  font-size: 0.9rem;
}

.contact-status-success { color: #1a7f37; }
.contact-status-error { color: #cf222e; }

.admin-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 24px;
}

.admin-message-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.admin-message-item {
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
}

.admin-message-item.is-unread {
  border-left: 3px solid var(--accent);
}

.admin-message-meta {
  display: flex;
  gap: 10px;
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 8px;
}

.admin-message-body {
  white-space: pre-wrap;
  margin: 0 0 10px;
}

.admin-mark-read-btn,
.admin-logout-btn {
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 0.85rem;
  cursor: pointer;
}

.admin-message-empty {
  color: var(--muted);
  font-size: 0.9rem;
}

.auth-switch-link {
  margin-top: 16px;
  font-size: 0.9rem;
  color: var(--muted);
}

.history-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.history-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
  flex-wrap: wrap;
}

.history-badge {
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 12px;
  background: var(--bg);
  color: var(--muted);
  border: 1px solid var(--border);
  flex-shrink: 0;
}

.history-badge-term { color: var(--accent); border-color: var(--accent); }

.history-title {
  flex: 1 1 auto;
  min-width: 0;
}

.history-title a { color: var(--text); }

.history-time {
  font-size: 0.8rem;
  color: var(--muted);
  flex-shrink: 0;
}

.history-delete-btn {
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 0.8rem;
  cursor: pointer;
  flex-shrink: 0;
}

.history-empty {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 16px;
}

h1 { font-size: 1.9rem; font-weight: 800; letter-spacing: -0.02em; line-height: 1.3; margin-bottom: 6px; }
h2 { font-size: 1.25rem; font-weight: 700; letter-spacing: -0.01em; margin-top: 32px; color: var(--text); }
.subtitle { color: var(--muted); font-size: 1rem; line-height: 1.7; margin-bottom: 28px; }

.viewer-promo {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 20px 0 28px;
  padding: 18px 20px;
  background: var(--accent-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.viewer-promo:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.06);
}

.viewer-promo:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.viewer-promo-icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  color: var(--accent);
}
.viewer-promo-text { flex: 1 1 auto; }
.viewer-promo-cta {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 8px;
  padding: 9px 16px;
  white-space: nowrap;
}
.viewer-promo:hover .viewer-promo-cta { background: var(--accent-hover); }

.viewer-promo-icon svg {
  width: 24px;
  height: 24px;
}

.viewer-promo-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.viewer-promo-text strong {
  font-size: 1rem;
}

.viewer-promo-desc {
  font-size: 0.88rem;
  color: var(--muted);
}

.wod-section {
  margin: 28px 0;
}

.wod-heading,
.home-section-heading {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 14px;
}

.wod-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 10px;
}

.wod-card {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 16px 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card-bg);
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.wod-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.wod-card-term .term-en {
  display: block;
  margin-top: 4px;
  font-size: 0.78rem;
  font-weight: 400;
  color: var(--muted);
}

.home-category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 10px;
  margin-bottom: 12px;
}

.home-category-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card-bg);
  color: var(--text);
  text-decoration: none;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.home-category-card:hover {
  border-color: var(--accent);
  background: var(--hover-tint);
}

.home-category-card-title {
  font-weight: 600;
}

.home-category-card-count {
  font-size: 0.78rem;
  color: var(--muted);
}

.home-browse-all-link {
  display: inline-block;
  margin-bottom: 24px;
  color: var(--accent);
  text-decoration: none;
  font-size: 0.92rem;
}

.home-browse-all-link:hover {
  text-decoration: underline;
}

.home-learn-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 28px;
}

.home-learn-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  text-decoration: none;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.home-learn-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.home-learn-card svg { color: var(--accent); flex-shrink: 0; }

.home-learn-card-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.home-learn-card-text strong { font-size: 0.95rem; }
.home-learn-card-text span { font-size: 0.82rem; color: var(--muted); }

@media (max-width: 560px) {
  .home-learn-grid { grid-template-columns: 1fr; }
  .viewer-promo-cta { display: none; }
}

.term-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}

.term-list li a {
  display: block;
  padding: 14px 16px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  text-decoration: none;
  color: var(--text);
}

.term-list li a { transition: border-color 0.2s ease, transform 0.2s ease; }
.term-list li a:hover { border-color: var(--accent); transform: translateY(-2px); }

.term-list .term-en {
  color: var(--muted);
  font-size: 0.85rem;
  margin-left: 6px;
}

.definition-box {
  background: var(--accent-soft);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 10px;
  padding: 16px 20px;
  margin: 12px 0 24px;
  font-size: 1.05rem;
  line-height: 1.65;
}
.definition-box > strong {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}

.example {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 18px;
  font-size: 0.95rem;
  font-style: italic;
  color: var(--text);
  margin: 10px 0;
}

.related-terms a {
  display: inline-block;
  margin: 4px 8px 4px 0;
  padding: 6px 12px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--accent);
  text-decoration: none;
}

footer.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 40px;
  padding: 24px 20px;
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
}

footer.site-footer a {
  color: var(--muted);
  margin: 0 8px;
}

.breadcrumb {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 16px;
}

.breadcrumb a { color: var(--accent); }

.term-back-btn {
  display: inline-block;
  margin-bottom: 12px;
  padding: 6px 12px;
  font-size: 0.85rem;
  color: var(--muted);
  background: none;
  border: 1px solid var(--border, #ddd);
  border-radius: 6px;
  cursor: pointer;
}

.term-back-btn:hover {
  color: inherit;
  border-color: var(--muted);
}

main.wide {
  max-width: 1200px;
}

.viewer-layout {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

.viewer-input {
  flex: 1 1 60%;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.viewer-input textarea {
  width: 100%;
  min-height: 420px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.95rem;
  line-height: 1.7;
  resize: vertical;
}

.viewer-input button {
  align-self: flex-start;
  padding: 10px 20px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 0.95rem;
  cursor: pointer;
}

.viewer-input button:disabled {
  background: var(--muted);
  cursor: not-allowed;
}

.viewer-rendered {
  padding: 16px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  white-space: pre-wrap;
  line-height: 1.8;
  /* Matches the textarea it replaces on screen, and keeps a long paper from
     stretching the pane far past the sidebar. */
  min-height: 420px;
  max-height: 70vh;
  overflow-y: auto;
}

/* Secondary action next to the primary "용어 찾기" button. */
.viewer-input button#edit-text-btn {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--border);
}

.viewer-input button#edit-text-btn:hover {
  background: var(--hover-tint);
}

.viewer-rendered mark {
  background: #fff3b0;
  color: #1f2328;
  border-radius: 2px;
  padding: 0 2px;
  transition: background 0.3s ease, color 0.3s ease;
}

.viewer-rendered mark.dict-mark,
.textLayer mark.dict-mark {
  cursor: pointer;
}

.viewer-rendered mark.dict-mark:hover,
.textLayer mark.dict-mark:hover {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.viewer-rendered mark.mark-flash {
  background: var(--accent);
  color: #fff;
}

.viewer-terms {
  flex: 1 1 320px;
  position: sticky;
  top: 20px;
}

.viewer-terms input[type="search"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 16px;
  font-size: 0.9rem;
}

.viewer-terms .term-list .term-card {
  position: relative;
  display: block;
  padding: 14px 40px 14px 16px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 10px;
  cursor: pointer;
}

.viewer-terms .term-list .term-card:hover {
  border-color: var(--accent);
}

.term-card-name {
  display: block;
}

.term-card-hide-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 24px;
  height: 24px;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--muted, #888);
  font-size: 0.85rem;
  line-height: 1;
  cursor: pointer;
}

.term-card-hide-btn:hover {
  background: var(--hover-tint);
  color: var(--text);
}

.term-card-difficulty {
  display: inline-block;
  margin-left: 8px;
  padding: 1px 8px;
  font-size: 0.72rem;
  border-radius: 999px;
  background: var(--hover-tint);
  color: var(--muted, #888);
  vertical-align: middle;
}

.term-card-difficulty[data-difficulty="3"] {
  background: rgba(220, 80, 80, 0.15);
  color: #c94a4a;
}

.term-filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  margin-bottom: 12px;
  font-size: 0.85rem;
  color: var(--muted, #888);
}

.term-filter-group {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.term-filter-group label {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
}

#category-filter-select {
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 0.85rem;
}

.term-filter-link {
  border: none;
  background: none;
  color: var(--accent);
  cursor: pointer;
  font-size: 0.85rem;
  text-decoration: underline;
  padding: 0;
}

.term-list-empty {
  color: var(--muted, #888);
  padding: 12px 0;
}

.term-list li a.term-card-detail {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 10px;
  padding: 6px 12px;
  font-size: 0.82rem;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border-radius: 999px;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.term-list li a.term-card-detail:hover {
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

@media (max-width: 720px) {
  .viewer-layout {
    flex-direction: column;
  }

  .viewer-terms {
    position: static;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.delay-1 {
  animation-delay: 0s;
  animation: fadeInUp 1.5s cubic-bezier(0.4, 1, 0.3, 1) forwards;
}

.ad-container {
  margin: 24px auto -40px;
  padding: 10px;
  background: var(--card-bg);
  border-radius: 8px;
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 110px;
}

.ad-placeholder-text {
  font-size: 0.8rem;
  color: var(--muted);
  letter-spacing: 1px;
}

.sidebar {
  position: fixed;
  top: 0;
  right: -350px !important;
  width: 350px;
  height: 100vh;
  background: var(--card-bg, #ffffff);
  box-shadow: -4px 0 15px rgba(0, 0, 0, 0.08);
  border-left: 1px solid var(--border, #e2e5e9);
  z-index: 1000;


  transition: right 0.3s cubic-bezier(0.16, 1, 0.3, 1) !important;

  padding: 24px;
  display: flex;
  flex-direction: column;
}


.sidebar.open {
  right: 0 !important;
}


.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}
.sidebar-header h2 {
  margin: 0 !important;
  font-size: 1.3rem;
}


#close-sidebar-btn {
  background: none;
  border: none;
  font-size: 1.8rem;
  color: var(--muted, #57606a);
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
}
#close-sidebar-btn:hover {
  color: var(--text, #1f2328);
}


.sidebar-search-input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border, #e2e5e9);
  border-radius: 6px;
  font-size: 0.95rem;
  background: var(--bg, #fafafa);
  outline: none;
  margin-bottom: 20px;
}
.sidebar-search-input:focus {
  border-color: var(--accent, #2454ff);
}


.sidebar-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.3);
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}


.sidebar-overlay.open {
  opacity: 1;
  pointer-events: auto; /* 열렸을 때는 배경을 클릭할 수 있게 함(클릭 시 닫힘) */
}

main.delay-1 {
  animation: fadeInUp 0.6s cubic-bezier(0.4, 1, 0.3, 1) forwards;
}

@media (max-width: 480px) {
  .sidebar {
    padding: 16px !important;
    width: 290px !important;
  }


  .sidebar-header h2 {
    font-size: 1.1rem !important;
  }
}

.pdf-viewer {
  margin-top: 20px;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: auto;
  max-height: 900px;
  background: white;
}

.pdf-page {
  display: block;
  margin: 20px auto;
  box-shadow: 0 2px 10px rgba(0,0,0,.12);
}

.search-input:focus {
  border-color: var(--accent);
  background: var(--card-bg);
}

.search-btn {
  width: 100%;
  background: var(--accent);
  color: white;
  border: none;
  padding: 16px;
  font-size: 18px;
  font-weight: bold;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
}

.search-btn:hover {
  background: var(--accent-hover);
}

.input-row {
  display: flex;
  flex-direction: column;
  gap: 15px;
  align-items: flex-start;
  width: 100%;
  margin-top: 10px;
}

.file-label {
  width: 100%;
  text-align: center;
  background: #1f2328;
  color: white;
  padding: 14px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: bold;
  font-size: 15px;
  box-sizing: border-box;
}

#file-input {
  display: none;
}

.status-msg {
  font-size: 14px;
  color: #666;
  font-weight: bold;
  word-break: break-all;
}

details summary::-webkit-details-marker {
  display: none !important;
}

details summary {
  list-style: none !important;
  cursor: pointer !important;
  outline: none !important;
}

.namu-main-category{
    border:1px solid var(--border);
    border-radius:10px;
    background:var(--card-bg);
    margin:18px 0;
    overflow:hidden;
    transition:.25s;
}

.namu-main-category:hover{
    box-shadow:0 4px 12px rgba(0,0,0,.06);
}

.category-summary{
    display:flex;
    justify-content:space-between;
    align-items:center;

    padding:18px 22px;

    cursor:pointer;
    user-select:none;

    font-weight:600;
    list-style:none;
}

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

.category-title{

    display:flex;
    align-items:center;
    gap:12px;

}

.category-title::before{

    content:"▶";
    font-size:.8rem;

    transition:.100s;

    color:#57606a;

}

details[open]>.category-summary .category-title::before{

    transform:rotate(90deg);

}

.category-count{

    color:#656d76;
    font-size:.9rem;
    font-weight:500;

}

.category-more-link {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  white-space: nowrap;
}

.category-more-link:hover {
  background: var(--bg);
}

.category-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 8px 0 16px;
}

.category-badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 4px 12px;
  text-decoration: none;
}

.category-badge:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.bookmark-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 4px 0 16px;
  padding: 6px 14px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--muted);
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
}

.bookmark-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.bookmark-btn.is-bookmarked {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
}

.bookmark-btn .bookmark-icon {
  font-size: 1rem;
}

.namu-sub-wrapper{

    padding:8px 20px 18px;

}

.namu-sub-category{

    border:none;
    margin:18px 0;

}

.sub-summary{

    font-weight:600;
    color:#444;
    list-style:none;
    cursor:pointer;

}

.sub-summary::-webkit-details-marker{

    display:none;

}

.namu-sub-wrapper {
    display: block !important;
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    padding: 0 20px;
    transition: max-height 0.25s linear,
                opacity 0.2s linear,
                padding 0.25s linear;
    pointer-events: none;
}

.namu-sub-wrapper.is-active {
    max-height: 99999px;
    opacity: 1;
    padding: 8px 20px 18px;
    transition: max-height 0.25s linear,
                opacity 0.2s linear,
                padding 0.25s linear;
    pointer-events: auto;
}

.namu-term-list{
    display: block !important;
    list-style: none;
    padding-left: 18px;
    margin: 0;
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.25s linear,
                opacity 0.2s linear;
    pointer-events: none;
}

.namu-term-list.is-active {
    max-height: 99999px;
    opacity: 1;
    transition: max-height 0.25s linear,
                opacity 0.2s linear;
    pointer-events: auto;
}

.category-title::before,
.namu-sub-title::before {
    display: inline-block !important;
    transform: rotate(0deg) !important;
    transition: transform 0.2s linear !important;
}

.namu-main-category.js-animated > .category-summary .category-title::before,
.namu-sub-category.js-animated > .namu-sub-title::before {
    transform: rotate(90deg) !important;
    transition: transform 0.2s linear !important;
}

.namu-term-list li{

    border-top:1px solid var(--border);

}

.namu-term-list li:first-child{

    border-top:none;

}

.namu-term-list a{

    display:block;

    padding:12px 8px;

    color:var(--text);

    text-decoration:none;

    transition:.2s;

}

.namu-term-list a:hover{

    background:var(--hover-tint);
    color:var(--accent);

}

.namu-sub-wrapper{

    animation:fadeInUp .35s ease;

}

.term-list-more-btn{
    display:block;
    width:100%;
    padding:10px 8px;
    margin-top:4px;
    background:none;
    border:1px dashed var(--border);
    border-radius:6px;
    color:var(--accent);
    font-size:.9em;
    cursor:pointer;
    transition:.2s;
}

.term-list-more-btn:hover{
    background:var(--hover-tint);
}

.namu-main-category{
    border-left:4px solid var(--accent);
}

.namu-sub-title {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
  padding: 10px 14px;
  display: block;

  border-radius: 6px;
  transition:
      background-color .2s ease,
      color .2s ease,
      padding-left .2s ease;
}

.namu-sub-title:hover {
    background: var(--hover-tint);
    color: var(--accent);
    padding-left: 18px;
}

.namu-sub-title:active {
    background: var(--border);
}

.namu-sub-title::before {
    content: "▶";
    display: inline-block;
    width: 18px;
    color: var(--muted);
    transition: transform .2s ease;
}

details[open] > .namu-sub-title::before {
    transform: rotate(90deg);
}

.namu-sub-category{
    overflow:hidden;
}

.namu-sub-title{
    cursor:pointer;
    user-select:none;
}

.viewer-input{
    display:flex;
    gap:20px;
    align-items:stretch;
}

.viewer-input.no-pdf #paper-text{
    width:100%;
    height:720px;
    flex:none;
}

.pdf-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 8px;
    padding: 6px 8px;
    border: 1px solid var(--border, #ddd);
    border-radius: 8px;
    background: var(--card-bg, #f8f9fa);
    font-size: 0.85rem;
}

.pdf-toolbar[hidden] {
    display: none;
}

.pdf-toolbar-group {
    display: flex;
    align-items: center;
    gap: 6px;
}

.pdf-toolbar-group button {
    min-width: 28px;
    height: 28px;
    padding: 0 8px;
    border: 1px solid var(--border, #ddd);
    border-radius: 6px;
    background: var(--bg, #fff);
    color: var(--text, #222);
    cursor: pointer;
    font-size: 0.9rem;
    line-height: 1;
}

.pdf-toolbar-group button:hover {
    background: var(--hover-tint, #eef1f5);
}

#pdf-zoom-label {
    min-width: 42px;
    text-align: center;
    color: var(--muted, #888);
}

.pdf-search-group input[type="search"] {
    width: 160px;
    height: 28px;
    padding: 0 8px;
    border: 1px solid var(--border, #ddd);
    border-radius: 6px;
    background: var(--bg, #fff);
    color: var(--text, #222);
    font-size: 0.85rem;
}

#pdf-search-count {
    min-width: 44px;
    color: var(--muted, #888);
    font-variant-numeric: tabular-nums;
}

.viewer-input.no-pdf .pdf-viewer{
    display:none;
}

.viewer-input.has-pdf #paper-text,
.viewer-input.has-pdf .pdf-viewer{
    flex:1;
    aspect-ratio: 5 / 4;
    height: auto;
    max-height: 650px;
}

.pdf-viewer{
    aspect-ratio: 5 / 4;
    overflow-y: auto;
    border: 1px solid #ddd;
    border-radius: 10px;
    background: white;
    padding: 10px;
}

.pdf-page{

    display:block;

    margin:20px auto;

    box-shadow:0 3px 12px rgba(0,0,0,.15);

}

#paper-text{

    resize:none;

    font-size:15px;

    line-height:1.7;

}

.pdf-modal{

    display:none;

    position:fixed;

    inset:0;

    background:rgba(0,0,0,.7);

    z-index:9999;

}

.pdf-modal.show{

    display:flex;

    justify-content:center;

    align-items:center;

}

.pdf-modal-content {
    position: relative;
    width: 90%;
    height: 90%;
    background: white;
    border-radius: 12px;
}

#pdf-full-view {
    overflow-y: auto;
    height: 100%;
    padding: 60px 30px 30px;
}

#pdf-full-view canvas{

    display:block;
    margin:30px auto;
    max-width:100%;
    height:auto;

}

#close-pdf {
    position: fixed;
    top: 20px;
    right: 20px;

    width: 44px;
    height: 44px;

    border: none;
    border-radius: 50%;

    background: rgba(255, 255, 255, 0.95);
    color: #333;

    font-size: 24px;
    font-weight: bold;

    cursor: pointer;

    z-index: 99999;

    box-shadow: 0 2px 8px rgba(0,0,0,.25);
}

#close-pdf:hover {
    background: white;
    transform: scale(1.08);
}

/* Raised from 768px: the inline nav (logo + search + 학습 dropdown + the
   rest of the links) needs more like ~1050px of room to fit without
   squeezing the search box down to nothing, so the hamburger menu now takes
   over earlier, before that squeeze happens. */
@media (max-width:1080px){

    .site-header .inner{
        position:relative;
        display:flex;
        justify-content:space-between;
        align-items:center;
    }

    .menu-toggle{
        display:block;
    }

    .site-header nav{

        display:flex;
        flex-direction:column;

        position:absolute;
        top:100%;
        left:0;
        right:0;
        z-index:1200;

        background:var(--card-bg);
        box-shadow:0 8px 20px rgba(0,0,0,.12);

        opacity:0;
        visibility:hidden;
        transform:translateY(-12px);

        transition:
            opacity .35s ease,
            transform .35s ease,
            visibility .35s;
    }

    .site-header nav.show{

        opacity:1 !important;
        visibility:visible !important;
        transform:translateY(0);
    }

    .site-header nav a{
        margin:0;
        padding:14px 20px;
        border-bottom:1px solid var(--border);
    }

    .nav-dropdown{
        margin:0;
    }

    .nav-dropdown-toggle{
        width:100%;
        text-align:left;
        padding:14px 20px;
        border-bottom:1px solid var(--border);
    }

    .nav-dropdown-menu{
        display:flex;
        position:static;
        border:none;
        box-shadow:none;
        border-radius:0;
        padding:0;
        background:var(--hover-tint);
    }

    .nav-dropdown-menu a{
        margin:0;
        padding:14px 20px 14px 36px;
        border-bottom:1px solid var(--border);
        border-radius:0;
    }

}

.glossary-content {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out, opacity 0.3s ease-out, padding 0.4s ease-out;
    padding-top: 0;
    padding-bottom: 0;
}

.glossary-content.is-active {
    max-height: 500px;
    opacity: 1;
    padding-top: 10px;
    padding-bottom: 10px;
}

.quiz-box{
    max-width:700px;
    margin:auto;
}

#category-select,
#start-btn,
#next-btn{

    width:100%;
    padding:14px;
    margin-top:15px;
    border-radius:8px;
    font-size:16px;

}

#start-btn,
#next-btn{

    background:var(--accent);
    color:white;
    border:none;
    cursor:pointer;

}

#choices{

    display:grid;
    gap:12px;
    margin-top:20px;

}

.choice{

    padding:14px;
    border:1px solid var(--border);
    border-radius:8px;
    cursor:pointer;
    transition:.2s;
    color: var(--text);

}

.choice:hover{

    background:var(--hover-tint);
}

.choice.correct{

    background:var(--success-bg);
    border-color:var(--success-border);

}

.choice.wrong{

    background:var(--error-bg);
    border-color:var(--error-border);

}

.progress{

    height:10px;
    background:var(--progress-bg);
    border-radius:999px;
    overflow:hidden;
    margin:20px 0;

}

#progress-bar{

    width:0%;
    height:100%;
    background:var(--accent);
    transition:.3s;

}

.choice.correct{

    animation:pop .25s;

}

@keyframes pop{

0%{
transform:scale(.9);
}

70%{
transform:scale(1.06);
}

100%{
transform:scale(1);
}

}

#retry-btn{

    width:100%;
    padding:15px;
    margin-top:20px;

    border:none;
    border-radius:8px;

    background:#ff9800;
    color:white;

    cursor:pointer;

    font-size:16px;

    transition:.2s;

}

#retry-btn:hover{

    background:#f57c00;

}

.retry-btn{
    margin-top:20px;
    padding:12px 18px;

    background:var(--accent);
    color:white;

    border:none;
    border-radius:10px;

    font-size:15px;
    font-weight:600;

    cursor:pointer;

    transition:.25s;
}

.retry-btn:hover{
    background:var(--accent-hover);
    transform:translateY(-2px);
}

.retry-btn:active{
    transform:translateY(0);
}

.quiz-result{

    background:var(--card-bg);
    border:1px solid var(--border);
    border-radius:14px;
    padding:30px;
    text-align:center;
    box-shadow:0 4px 16px rgba(0,0,0,.06);

}

.quiz-result h2{
    margin-bottom:15px;
}

.quiz-result-score{
    font-size:32px;
    font-weight:bold;
    color:var(--accent);
}

.category-right{
    display:flex;
    align-items:center;
    gap:12px;
}



.category-more{
    text-decoration:none;
    color:var(--accent);
    font-size:14px;
    font-weight:600;
}

.category-more:hover{
    text-decoration:underline;
}

.namu-sub-title{
    display:flex;
    justify-content:space-between;
    align-items:center;
}

.sub-more-btn{
    font-size:13px;
    color:var(--accent);
    text-decoration:none;
    font-weight:600;
    padding:4px 10px;
    border-radius:999px;
    background:var(--accent-soft);
    transition:.2s;
}

.sub-more-btn:hover{
    background:var(--border);
}
.logo {
    white-space: nowrap;
    flex-shrink: 0;
}
.site-header .inner {
    flex-wrap: nowrap;
}
.update-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.update-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.update-header h2 {
    margin: 0;
    font-size: 1.1rem;
}

.update-tag {
    background: var(--accent-soft);
    color: var(--accent);
    font-size: 0.8rem;
    font-weight: 600;
    padding: 5px 12px;
    border-radius: 999px;
}

.update-card ul {
    margin: 0;
    padding-left: 20px;
}

.update-card li {
    margin-bottom: 8px;
    color: var(--text);
}

/* ---- PDF viewer: text layer, highlights, memos ---- */

.pdf-page-wrap {
    position: relative;
    margin: 20px auto;
    box-shadow: 0 3px 12px rgba(0, 0, 0, .15);
}

.pdf-page-wrap .pdf-page {
    display: block;
    margin: 0;
    box-shadow: none;
}

.textLayer {
    position: absolute;
    inset: 0;
    overflow: clip;
    line-height: 1;
    text-align: initial;
    transform-origin: 0 0;
}

.textLayer span,
.textLayer br {
    color: transparent;
    position: absolute;
    white-space: pre;
    cursor: text;
    transform-origin: 0% 0%;
}

.textLayer ::selection {
    background: rgba(37, 99, 235, 0.35);
}

.textLayer mark {
    color: transparent;
    padding: 0;
    margin: 0;
}

.textLayer mark.dict-mark {
    background: rgba(255, 224, 102, 0.55);
    border-radius: 2px;
}

.textLayer mark.user-mark {
    cursor: pointer;
    border-radius: 2px;
}

.textLayer mark.user-mark[data-color="yellow"] { background: rgba(255, 224, 102, 0.55); }
.textLayer mark.user-mark[data-color="green"]  { background: rgba(140, 233, 154, 0.55); }
.textLayer mark.user-mark[data-color="pink"]   { background: rgba(255, 201, 222, 0.55); }
.textLayer mark.user-mark[data-color="blue"]   { background: rgba(165, 216, 255, 0.55); }

.textLayer mark.mark-flash {
    background: var(--accent) !important;
}

.textLayer mark.search-mark {
    background: rgba(165, 216, 255, 0.6);
    border-radius: 2px;
}

.textLayer mark.search-mark.search-mark-active {
    background: #ff9f43;
}

/* Sidebar tabs (찾은 용어 / 내 메모) */

.viewer-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.viewer-tab {
    flex: 1;
    padding: 10px 8px;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--muted);
    font-size: 0.9rem;
    cursor: pointer;
}

.viewer-tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
    font-weight: 600;
}

.tab-badge {
    display: inline-block;
    min-width: 18px;
    padding: 0 5px;
    margin-left: 4px;
    border-radius: 999px;
    background: var(--accent);
    color: #fff;
    font-size: 0.7rem;
    line-height: 18px;
}

.notes-empty {
    color: var(--muted);
    font-size: 0.9rem;
    padding: 8px 0;
}

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

.note-card {
    display: flex;
    gap: 10px;
    padding: 12px 14px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-bottom: 10px;
    cursor: pointer;
}

.note-card:hover {
    border-color: var(--accent);
}

.note-card-dot {
    flex: none;
    width: 12px;
    height: 12px;
    margin-top: 4px;
    border-radius: 50%;
}

.note-card-dot[data-color="yellow"] { background: #ffe066; }
.note-card-dot[data-color="green"]  { background: #8ce99a; }
.note-card-dot[data-color="pink"]   { background: #ffc9de; }
.note-card-dot[data-color="blue"]   { background: #a5d8ff; }

.note-card-body {
    min-width: 0;
}

.note-card-quote {
    margin: 0 0 4px;
    font-size: 0.85rem;
    color: var(--muted);
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.note-card-memo {
    margin: 0 0 4px;
    font-size: 0.92rem;
}

.note-card-memo-empty {
    color: var(--muted);
    font-style: italic;
}

.note-card-page {
    font-size: 0.75rem;
    color: var(--muted);
}

/* Floating highlight-color toolbar shown on text selection */

.highlight-toolbar {
    position: fixed;
    z-index: 10000;
    display: flex;
    gap: 6px;
    padding: 6px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, .2);
}

.hl-color {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 2px solid #fff;
    box-shadow: 0 0 0 1px var(--border);
    background: var(--hl-color);
    cursor: pointer;
    padding: 0;
}

.hl-color:hover {
    box-shadow: 0 0 0 2px var(--accent);
}

/* Memo popover for creating/editing a note on a highlight */

.memo-popover {
    position: fixed;
    z-index: 10000;
    width: 260px;
    padding: 10px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, .2);
}

.memo-popover textarea {
    width: 100%;
    min-height: 70px;
    padding: 8px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-family: inherit;
    font-size: 0.88rem;
    resize: vertical;
}

.memo-popover-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 8px;
}

.memo-btn {
    padding: 6px 14px;
    border: none;
    border-radius: 6px;
    font-size: 0.85rem;
    cursor: pointer;
}

.memo-btn-primary {
    background: var(--accent);
    color: #fff;
}

.memo-btn-danger {
    background: none;
    color: #d1495b;
    border: 1px solid #d1495b;
}

/* Bookmark tag/category filters */
.bookmark-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin: 8px 0 16px;
}
.bookmark-filter-select {
  padding: 6px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}
.bookmark-tag-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.bookmark-tag-filter-chip {
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  font-size: 0.85em;
}
.bookmark-tag-filter-chip.is-active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.bookmark-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}
.bookmark-tag-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--text);
  font-size: 0.8em;
}
.bookmark-tag-remove {
  border: none;
  background: none;
  cursor: pointer;
  padding: 0;
  font-size: 1em;
  line-height: 1;
  color: inherit;
}
.bookmark-tag-add-btn {
  border: none;
  background: none;
  color: var(--accent);
  cursor: pointer;
  font-size: 0.8em;
  padding: 0;
}
.bookmark-tag-input {
  font-size: 0.8em;
  padding: 2px 6px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

/* Roadmap */
.roadmap-subcat {
  margin: 24px 0;
}
.roadmap-progress-label {
  font-size: 0.75em;
  opacity: 0.7;
  font-weight: normal;
}
.roadmap-progress-bar {
  height: 6px;
  border-radius: 999px;
  background: var(--border);
  overflow: hidden;
  margin: 6px 0 12px;
}
.roadmap-progress-fill {
  height: 100%;
  background: var(--accent);
}
.roadmap-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.roadmap-item label {
  display: flex;
  align-items: center;
  gap: 8px;
}
.roadmap-difficulty {
  font-size: 0.7em;
  padding: 1px 6px;
  border-radius: 4px;
  color: #fff;
}
.roadmap-difficulty-1 { background: #4caf50; }
.roadmap-difficulty-2 { background: #ff9800; }
.roadmap-difficulty-3 { background: #f44336; }

/* Roadmap → quiz scope banner */
.quiz-scope-banner {
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  border-radius: 8px;
  padding: 10px 14px;
  margin-bottom: 12px;
  font-size: 0.9em;
}

/* Flashcards */
.flashcard-start-btn {
  border: 1px solid var(--accent);
  background: transparent;
  color: var(--accent);
  border-radius: 6px;
  padding: 2px 10px;
  font-size: 0.75em;
  cursor: pointer;
  margin-left: 8px;
}
.flashcard-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 16px;
}
.flashcard-panel {
  background: var(--bg);
  color: var(--text);
  border-radius: 12px;
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
  padding: 20px;
  position: relative;
}
.flashcard-close-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  border: none;
  background: none;
  font-size: 1.4em;
  cursor: pointer;
  color: var(--text);
}
.flashcard-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 14px;
  padding-right: 30px;
}
.flashcard-progress-text {
  font-size: 0.85em;
  opacity: 0.75;
}
.flashcard-unknown-toggle {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 0.8em;
  cursor: pointer;
}
.flashcard-unknown-toggle.is-active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.flashcard-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 24px;
  cursor: pointer;
  user-select: none;
  font-size: 1.3em;
  line-height: 1.5;
}
.flashcard-card .flashcard-face-label {
  display: block;
  font-size: 0.5em;
  opacity: 0.55;
  margin-bottom: 10px;
}
.flashcard-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 14px;
  gap: 10px;
}
.flashcard-nav button {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  border-radius: 6px;
  padding: 6px 12px;
  cursor: pointer;
}
.flashcard-judge {
  display: flex;
  gap: 10px;
  margin-top: 14px;
}
.flashcard-judge button {
  flex: 1;
  border-radius: 8px;
  padding: 10px;
  font-size: 1em;
  cursor: pointer;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
}
.flashcard-judge button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.flashcard-judge-known {
  border-color: #4caf50 !important;
  color: #4caf50 !important;
}
.flashcard-judge-unknown {
  border-color: #f44336 !important;
  color: #f44336 !important;
}
.flashcard-summary {
  text-align: center;
}
.flashcard-summary-score {
  font-size: 1.6em;
  margin: 12px 0;
}
.flashcard-summary-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 16px;
}
.flashcard-summary-actions button {
  border-radius: 8px;
  padding: 10px;
  cursor: pointer;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
}
.flashcard-summary-actions .flashcard-quiz-btn {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}