:root {
  --bg: #f5f1e8;
  --bg2: #fffdf8;
  --bg3: #f2ede2;
  --border: #ddd2bf;
  --border2: #c9bca6;
  --text: #241d17;
  --text2: #5f5348;
  --text3: #988a7c;
  --accent: #3f8b2f;
  --accent2: #337026;
  --accent-dim: rgba(63, 139, 47, 0.1);
  --red: #c74d4d;
  --amber: #b97819;
  --blue: #356ec8;
  --teal: #17888d;
  --tag-bg: #f6f0e4;
  --radius: 8px;
  --radius-lg: 14px;
}

body.theme-light {
  --bg: #f5f1e8;
  --bg2: #fffdf8;
  --bg3: #f2ede2;
  --border: #ddd2bf;
  --border2: #c9bca6;
  --text: #241d17;
  --text2: #5f5348;
  --text3: #988a7c;
  --accent: #3f8b2f;
  --accent2: #337026;
  --accent-dim: rgba(63, 139, 47, 0.1);
  --red: #c74d4d;
  --amber: #b97819;
  --blue: #356ec8;
  --teal: #17888d;
  --tag-bg: #f6f0e4;
}

body.theme-dark {
  --bg: #0f0f0f;
  --bg2: #161616;
  --bg3: #1e1e1e;
  --border: #2a2a2a;
  --border2: #333;
  --text: #e8e6e1;
  --text2: #8a8680;
  --text3: #555;
  --accent: #c8f03c;
  --accent2: #a3c72a;
  --accent-dim: rgba(200, 240, 60, 0.08);
  --red: #ff6b6b;
  --amber: #ffb347;
  --blue: #5b9cf6;
  --teal: #4ecdc4;
  --tag-bg: #1a1a1a;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: "DM Sans", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  font-size: 16px;
  line-height: 1.7;
}

body.theme-light .hljs {
  color: #2b2118;
}

button,
input {
  font: inherit;
}

.app {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

.guide-intro {
  color: var(--text2);
  font-size: 15px;
  line-height: 1.7;
}

.guide-label {
  font-family: "DM Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--text3);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.guide-title {
  font-size: 28px;
  line-height: 1.25;
  margin-bottom: 10px;
}

.guide-list {
  color: var(--text2);
  padding-left: 18px;
  display: grid;
  gap: 8px;
  font-size: 14px;
}

.guide-list-numbered {
  padding-left: 20px;
}

.guide-links {
  display: grid;
  gap: 8px;
}

.guide-links a {
  color: var(--accent);
  text-decoration: none;
  font-size: 13px;
}

.guide-links a:hover {
  text-decoration: underline;
}

.sidebar {
  width: 280px;
  min-width: 280px;
  background: var(--bg2);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.main {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  padding: 20px 18px 14px;
  border-bottom: 1px solid var(--border);
}

.logo {
  font-family: "DM Mono", monospace;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}

.logo-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }

  50% {
    opacity: 0.5;
    transform: scale(0.85);
  }
}

.search-wrap {
  position: relative;
}

.search {
  width: 100%;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 7px 10px 7px 32px;
  color: var(--text);
  font-size: 13px;
  outline: none;
  transition: border-color 0.15s;
}

.search:focus {
  border-color: var(--accent);
}

.search::placeholder {
  color: var(--text3);
}

.search-icon {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text3);
  font-size: 12px;
  pointer-events: none;
}

.sidebar-copy {
  color: var(--text3);
  font-size: 11px;
  margin-top: 12px;
  line-height: 1.5;
}

.sidebar-section {
  padding: 10px 10px 4px;
}

.sidebar-actions {
  display: grid;
  gap: 8px;
}

.side-action {
  width: 100%;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px 10px;
  color: var(--text2);
  text-align: center;
  cursor: pointer;
  transition: all 0.12s;
}

.side-action:hover {
  color: var(--text);
  border-color: var(--border2);
}

.side-action.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}

.sidebar-label {
  font-family: "DM Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--text3);
  text-transform: uppercase;
  padding: 0 8px;
  margin-bottom: 4px;
}

.pattern-btn {
  display: flex;
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 7px 10px;
  border-radius: var(--radius);
  color: var(--text2);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.12s;
  align-items: center;
  justify-content: space-between;
}

.pattern-btn:hover {
  background: var(--bg3);
  color: var(--text);
}

.pattern-btn.active {
  background: var(--accent-dim);
  color: var(--accent);
}

.pattern-count {
  font-family: "DM Mono", monospace;
  font-size: 10px;
  color: var(--text3);
  background: var(--bg3);
  border-radius: 999px;
  padding: 1px 7px;
}

.pattern-btn.active .pattern-count {
  color: var(--accent);
  background: rgba(200, 240, 60, 0.12);
}

.sidebar-stats {
  margin-top: auto;
  padding: 14px 18px;
  border-top: 1px solid var(--border);
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.stat-card {
  background: var(--bg3);
  border-radius: var(--radius);
  padding: 10px 12px;
  text-align: center;
}

.stat-num {
  font-family: "DM Mono", monospace;
  font-size: 20px;
  font-weight: 500;
  color: var(--text);
  line-height: 1.1;
}

.stat-label {
  font-size: 10px;
  color: var(--text3);
  margin-top: 2px;
  letter-spacing: 0.04em;
}

.due-today .stat-num {
  color: var(--accent);
}

.main-header {
  padding: 22px 28px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.main-title {
  font-family: "DM Mono", monospace;
  font-size: 13px;
  color: var(--text2);
  flex: 1;
}

.filter-row {
  display: flex;
  gap: 6px;
  align-items: center;
  flex-wrap: wrap;
}

.filter-btn {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 12px;
  color: var(--text2);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.12s;
  white-space: nowrap;
}

.filter-btn:hover {
  border-color: var(--border2);
  color: var(--text);
}

.filter-btn.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}

.problem-list {
  padding: 16px 20px;
}

.problem-card {
  width: 100%;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px 18px;
  margin-bottom: 8px;
  cursor: pointer;
  transition: all 0.15s;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 12px;
  align-items: start;
  text-align: left;
}

.problem-card:hover {
  border-color: var(--border2);
  background: var(--bg3);
  transform: translateX(2px);
}

.problem-card.due {
  border-left: 3px solid var(--accent);
}

.problem-num {
  font-family: "DM Mono", monospace;
  font-size: 11px;
  color: var(--text3);
  padding-top: 2px;
  min-width: 48px;
}

.problem-info {
  min-width: 0;
}

.problem-title {
  font-size: 17px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.problem-summary {
  color: var(--text3);
  font-size: 14px;
  margin-bottom: 8px;
}

.tags,
.fc-patterns {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.tag {
  font-family: "DM Mono", monospace;
  font-size: 10px;
  background: var(--tag-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 7px;
  color: var(--text2);
  white-space: nowrap;
}

.tag.pattern {
  color: var(--blue);
  border-color: rgba(91, 156, 246, 0.25);
  background: rgba(91, 156, 246, 0.06);
}

.problem-right,
.detail-status {
  text-align: right;
  display: flex;
  align-items: flex-end;
  gap: 4px;
}

.detail-status {
  flex-direction: row;
  justify-self: end;
  flex-wrap: wrap;
  gap: 8px;
}

.detail-review-controls {
  display: grid;
  grid-template-columns: auto auto;
  gap: 6px 8px;
  justify-items: end;
  justify-self: end;
  min-width: 0;
}

.fam-badge {
  font-family: "DM Mono", monospace;
  font-size: 12px;
  border-radius: 999px;
  padding: 4px 10px;
  font-weight: 500;
}

.fam-0 {
  background: rgba(255, 107, 107, 0.12);
  color: var(--red);
}

.fam-1 {
  background: rgba(255, 179, 71, 0.12);
  color: var(--amber);
}

.fam-2 {
  background: rgba(91, 156, 246, 0.12);
  color: var(--blue);
}

.fam-3 {
  background: rgba(200, 240, 60, 0.12);
  color: var(--accent);
}

.next-review,
.detail-next {
  font-size: 12px;
  color: var(--text3);
  font-family: "DM Mono", monospace;
}

.next-review.overdue,
.detail-next.overdue {
  color: var(--accent);
}

.empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  color: var(--text3);
  text-align: center;
  font-family: "DM Mono", monospace;
  font-size: 13px;
  gap: 8px;
}

.detail-page {
  display: none;
  flex: 1;
  overflow-y: auto;
  min-width: 0;
}

.detail-page.active {
  display: flex;
}

.detail-panel {
  width: 100%;
  min-height: 100%;
  background: var(--bg);
  display: flex;
  flex-direction: column;
}

.detail-header {
  padding: 14px 20px 12px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg2);
  z-index: 10;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
}

.detail-back {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 5px 10px;
  color: var(--text2);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.12s;
  white-space: nowrap;
}

.detail-back:hover {
  color: var(--text);
  border-color: var(--border2);
}

.detail-title-block {
  min-width: 0;
}

.detail-title-head {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  margin-bottom: 2px;
}

.detail-num {
  font-family: "DM Mono", monospace;
  font-size: 11px;
  color: var(--text3);
  margin-bottom: 0;
  white-space: nowrap;
}

.detail-title {
  font-size: 21px;
  font-weight: 500;
  color: var(--text);
  line-height: 1.25;
  margin-bottom: 4px;
}

.detail-title-block .detail-title {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.detail-title-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.detail-title-tags {
  min-width: 0;
  flex-wrap: nowrap;
  overflow: hidden;
}

.detail-title-tags .tag {
  overflow: hidden;
  text-overflow: ellipsis;
}

.detail-link {
  font-family: "DM Mono", monospace;
  font-size: 11px;
  color: var(--accent);
  text-decoration: none;
  opacity: 0.8;
}

.detail-link:hover {
  opacity: 1;
  text-decoration: underline;
}

.detail-body {
  padding: 18px 20px 28px;
  flex: 1;
}

.detail-layout {
  display: grid;
  grid-template-areas: "problem summary code";
  grid-template-columns: minmax(280px, 0.9fr) minmax(320px, 0.95fr) minmax(440px, 1.15fr);
  gap: 24px;
  align-items: start;
}

.detail-column {
  min-width: 0;
}

.detail-column-problem {
  grid-area: problem;
}

.detail-column-main {
  grid-area: summary;
}

.detail-column-side {
  grid-area: code;
}

.section-stretch .note-text {
  min-height: 360px;
}

.section {
  margin-bottom: 24px;
}

.section-label {
  font-family: "DM Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text3);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-label::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

.summary-text,
.note-text,
.prompt-text,
.example-text {
  font-size: 16px;
  color: var(--text2);
  line-height: 1.7;
  background: var(--bg3);
  border-radius: var(--radius);
  padding: 12px 14px;
}

.summary-text {
  border-left: 3px solid var(--accent);
}

.prompt-text,
.example-text {
  border: 1px solid var(--border);
}

.markdown-body {
  display: grid;
  gap: 10px;
}

.markdown-body > * {
  margin: 0;
}

.markdown-body code {
  font-family: "DM Mono", monospace;
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
  padding: 1px 5px;
  border-radius: 4px;
}

.markdown-body ul,
.markdown-body ol {
  padding-left: 18px;
}

.code-wrap {
  background: #111;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
}

body.theme-light .code-wrap {
  background: #f7f2e9;
}

.code-header {
  padding: 8px 14px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.code-lang {
  font-family: "DM Mono", monospace;
  font-size: 10px;
  color: var(--text3);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.copy-btn {
  font-family: "DM Mono", monospace;
  font-size: 10px;
  color: var(--text3);
  background: none;
  border: none;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
  transition: all 0.12s;
}

.copy-btn:hover {
  color: var(--accent);
  background: var(--accent-dim);
}

.code-wrap pre {
  margin: 0 !important;
  padding: 14px 16px !important;
  background: transparent !important;
  font-size: 14px !important;
  line-height: 1.65 !important;
  overflow-x: auto;
}

.code-wrap code {
  font-family: "DM Mono", monospace !important;
}

.complexity-row {
  display: flex;
  gap: 10px;
}

.complexity-chip {
  flex: 1;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 14px;
  text-align: center;
}

.complexity-type {
  font-family: "DM Mono", monospace;
  font-size: 10px;
  color: var(--text3);
  margin-bottom: 4px;
  letter-spacing: 0.06em;
}

.complexity-val {
  font-family: "DM Mono", monospace;
  font-size: 16px;
  color: var(--teal);
  font-weight: 500;
}

.gotcha-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.gotcha-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13px;
  color: var(--text2);
  background: var(--bg3);
  padding: 9px 12px;
  border-radius: var(--radius);
}

.gotcha-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--amber);
  margin-top: 7px;
  flex-shrink: 0;
}

.review-title {
  font-family: "DM Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text3);
  text-transform: uppercase;
  margin-bottom: 14px;
}

.review-question {
  font-size: 14px;
  color: var(--text2);
  margin-bottom: 14px;
  line-height: 1.6;
}

.fam-grid,
.fc-score-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.fam-grid {
  margin-bottom: 12px;
}

.detail-review-controls .fam-grid {
  margin-bottom: 0;
  grid-template-columns: repeat(4, minmax(0, 54px));
  gap: 6px;
  grid-column: 1;
  grid-row: 1;
}

.fam-btn,
.fc-score-btn {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  font-family: "DM Mono", monospace;
  transition: all 0.15s;
  background: var(--bg2);
  color: var(--text2);
}

.fam-btn {
  padding: 10px 6px;
  font-size: 11px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: center;
}

.detail-review-controls .fam-btn {
  min-width: 54px;
  padding: 6px 4px;
  gap: 2px;
}

.fam-btn .num {
  font-size: 18px;
  font-weight: 500;
}

.detail-review-controls .fam-btn .num {
  font-size: 15px;
}

.fam-btn .desc,
.fc-score-btn span:last-child {
  font-size: 10px;
  color: var(--text3);
  line-height: 1.3;
  text-align: center;
}

.detail-review-controls .fam-btn .desc {
  font-size: 9px;
  line-height: 1.15;
}

.fam-btn:hover {
  border-color: var(--border2);
}

.fam-btn[data-score="0"]:hover,
.fam-btn[data-score="0"].selected,
.fc-score-btn[data-s="0"]:hover {
  border-color: var(--red);
  background: rgba(255, 107, 107, 0.08);
  color: var(--red);
}

.fam-btn[data-score="1"]:hover,
.fam-btn[data-score="1"].selected,
.fc-score-btn[data-s="1"]:hover {
  border-color: var(--amber);
  background: rgba(255, 179, 71, 0.08);
  color: var(--amber);
}

.fam-btn[data-score="2"]:hover,
.fam-btn[data-score="2"].selected,
.fc-score-btn[data-s="2"]:hover {
  border-color: var(--blue);
  background: rgba(91, 156, 246, 0.08);
  color: var(--blue);
}

.fam-btn[data-score="3"]:hover,
.fam-btn[data-score="3"].selected,
.fc-score-btn[data-s="3"]:hover {
  border-color: var(--accent);
  background: var(--accent-dim);
  color: var(--accent);
}

.review-confirm {
  width: 100%;
  background: var(--accent);
  color: #0f0f0f;
  border: none;
  border-radius: var(--radius);
  padding: 10px;
  font-family: "DM Mono", monospace;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: all 0.15s;
  display: none;
}

.detail-review-controls .review-confirm {
  width: auto;
  min-width: 88px;
  padding: 8px 12px;
  font-size: 11px;
  grid-column: 2;
  grid-row: 1;
  align-self: stretch;
}

.review-confirm:hover {
  background: var(--accent2);
  transform: translateY(-1px);
}

.review-result {
  display: none;
  text-align: center;
  padding: 4px 0;
}

.detail-review-controls .review-result {
  padding: 0;
  text-align: right;
  grid-column: 1 / span 2;
  grid-row: 2;
}

.review-result-text {
  font-family: "DM Mono", monospace;
  font-size: 12px;
  color: var(--accent);
}

.detail-review-controls .review-result-text {
  font-size: 10px;
}

.review-page {
  display: none;
  flex: 1;
  flex-direction: column;
}

.guide-page {
  display: none;
  flex: 1;
  flex-direction: column;
  overflow-y: auto;
}

.review-page.active {
  display: flex;
}

.guide-page.active {
  display: flex;
}

.review-page-header {
  padding: 22px 28px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 16px;
  justify-content: space-between;
}

.review-page-title {
  font-family: "DM Mono", monospace;
  font-size: 16px;
  color: var(--text);
  font-weight: 500;
  flex: 1;
}

.review-page-subtitle {
  font-size: 13px;
  color: var(--text3);
  margin-top: 4px;
}

.guide-page-header {
  padding: 24px 32px 18px;
  border-bottom: 1px solid var(--border);
}

.guide-page-body {
  padding: 28px 32px 40px;
}

.guide-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 22px 24px;
}

.guide-card h3 {
  font-size: 20px;
  margin-bottom: 10px;
}

.guide-card-hero {
  margin-bottom: 20px;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.review-queue {
  font-size: 12px;
  color: var(--text3);
  font-family: "DM Mono", monospace;
}

.review-card-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 28px;
}

.flashcard {
  width: 100%;
  max-width: 620px;
  perspective: 1000px;
}

.flashcard-inner {
  position: relative;
  width: 100%;
  min-height: 380px;
  transform-style: preserve-3d;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.flashcard-inner.flipped {
  transform: rotateY(180deg);
}

.flashcard-face {
  position: absolute;
  width: 100%;
  min-height: 380px;
  backface-visibility: hidden;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
}

.flashcard-back {
  transform: rotateY(180deg);
}

.fc-label,
.fc-number {
  font-family: "DM Mono", monospace;
}

.fc-label {
  font-size: 10px;
  color: var(--text3);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.fc-number {
  font-size: 11px;
  color: var(--text3);
  margin-bottom: 16px;
}

.fc-question {
  font-size: 26px;
  font-weight: 500;
  color: var(--text);
  flex: 1;
  display: flex;
  align-items: center;
}

.fc-hint {
  font-size: 12px;
  color: var(--text3);
  font-family: "DM Mono", monospace;
  text-align: center;
  margin-top: 20px;
}

.fc-answer {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.fc-answer-text {
  font-size: 16px;
  color: var(--text2);
  line-height: 1.7;
  margin-bottom: 16px;
}

.fc-note {
  font-size: 14px;
  color: var(--text3);
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
  margin-bottom: 16px;
}

.fc-note ul {
  padding-left: 18px;
}

.fc-score-row {
  margin-top: auto;
}

.fc-score-btn {
  padding: 8px 4px;
  font-size: 11px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.fc-score-btn .n {
  font-size: 16px;
}

.flip-btn {
  width: 100%;
  margin-top: 16px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  color: var(--text2);
  font-family: "DM Mono", monospace;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
  letter-spacing: 0.06em;
}

.flip-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

.review-done {
  display: none;
  flex: 1;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px;
  text-align: center;
}

.done-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.done-title {
  font-family: "DM Mono", monospace;
  font-size: 18px;
  color: var(--accent);
  margin-bottom: 8px;
}

.done-sub {
  font-size: 13px;
  color: var(--text3);
  margin-bottom: 24px;
}

.done-btn {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 24px;
  color: var(--text2);
  font-family: "DM Mono", monospace;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
}

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

.nav {
  display: flex;
  gap: 4px;
}

.nav-btn {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px 14px;
  color: var(--text2);
  font-size: 12px;
  cursor: pointer;
  font-family: "DM Mono", monospace;
  transition: all 0.12s;
  letter-spacing: 0.04em;
}

.nav-btn:hover {
  border-color: var(--border2);
  color: var(--text);
}

.nav-btn.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}

.hljs {
  background: transparent !important;
}

@media (max-width: 920px) {
  .sidebar {
    width: 240px;
    min-width: 240px;
  }

  .review-page-header {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 640px) {
  .app {
    flex-direction: column;
    height: auto;
    min-height: 100vh;
  }

  .sidebar {
    width: 100%;
    min-width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .main,
  .review-page,
  .guide-page,
  .detail-page {
    min-height: 0;
  }

  .detail-panel {
    min-height: auto;
  }

  .fam-grid,
  .fc-score-row,
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .problem-card {
    grid-template-columns: 1fr;
  }

  .problem-right,
  .detail-status {
    align-items: flex-start;
    text-align: left;
  }

  .detail-review-controls {
    justify-items: start;
    grid-template-columns: 1fr;
  }

  .detail-title-head {
    flex-wrap: wrap;
  }

  .detail-title-meta {
    flex-wrap: wrap;
  }

  .detail-review-controls .fam-grid,
  .detail-review-controls .review-confirm,
  .detail-review-controls .review-result {
    grid-column: 1;
  }

  .detail-review-controls .review-confirm,
  .detail-review-controls .review-result {
    text-align: left;
  }

  .detail-header {
    grid-template-columns: 1fr;
    padding: 20px 18px 14px;
  }

  .detail-body {
    padding: 20px 18px 28px;
  }

  .guide-page-body {
    padding: 20px 18px 28px;
  }

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

@media (max-width: 1480px) {
  .detail-layout {
    grid-template-areas:
      "problem summary"
      "code code";
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
}

@media (max-width: 1180px) {
  .detail-layout {
    grid-template-areas:
      "problem"
      "summary"
      "code";
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .section-stretch .note-text {
    min-height: 0;
  }
}