@import url("/assets/katex.min.css");
:root {
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  color: #272b30;
  background: #f8f9fb;
  font-synthesis: none;
  --bg: #f8f9fb;
  --surface: #fff;
  --soft: #f1f3f5;
  --line: #e6e8ec;
  --text: #272b30;
  --muted: #757d88;
  --accent: #b75a30;
  --tint: #fcf0e8;
  --code: #19232e;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
}
body.dark {
  --bg: #14181d;
  --surface: #1c2229;
  --soft: #242c35;
  --line: #323b46;
  --text: #e6e9ed;
  --muted: #a1acb9;
  --accent: #f1a477;
  --tint: #39291f;
  --code: #0c1118;
  background: var(--bg);
  color: var(--text);
}
a {
  color: inherit;
  text-decoration: none;
}
button,
input,
select,
textarea {
  font: inherit;
}
button,
a,
input,
select,
summary {
  touch-action: manipulation;
}
button {
  cursor: pointer;
}
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible {
  outline: 3px solid #d38a60;
  outline-offset: 3px;
}
header {
  height: 74px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 20;
}
.header-inner {
  max-width: 1440px;
  height: 100%;
  margin: auto;
  padding: 0 38px;
  display: flex;
  align-items: center;
  gap: 38px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 750;
  white-space: nowrap;
  letter-spacing: -0.6px;
}
.logo {
  background: var(--accent);
  color: var(--surface);
  height: 34px;
  width: 34px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 19px;
  letter-spacing: -4px;
  padding-right: 4px;
}
.logo span {
  font-size: 15px;
}
.local {
  font-size: 10px;
  letter-spacing: 1.4px;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 3px 5px;
  margin-left: 3px;
}
nav {
  display: flex;
  align-items: center;
  gap: 5px;
  flex: 1;
  height: 100%;
  overflow-x: auto;
}
nav a {
  white-space: nowrap;
  padding: 10px 14px;
  border-radius: 7px;
  font-size: 14px;
  color: var(--muted);
  font-weight: 600;
}
nav a.active {
  background: var(--tint);
  color: var(--accent);
}
nav a:hover {
  background: var(--soft);
}
.icon-button {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  border-radius: 8px;
  width: 35px;
  height: 35px;
  flex-shrink: 0;
}
.layout {
  max-width: 1370px;
  padding: 36px 32px 64px;
  margin: auto;
  display: grid;
  grid-template-columns: 228px minmax(0, 1fr);
  gap: 36px;
}
.sidebar {
  position: sticky;
  top: 109px;
  align-self: start;
}
.side-label {
  font-size: 12px;
  letter-spacing: 1.5px;
  color: var(--muted);
  margin: 0 0 14px;
  padding-left: 12px;
}
.side-links {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.side-links button {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  text-align: left;
  width: 100%;
  border: 0;
  background: transparent;
  border-radius: 7px;
  padding: 10px 12px;
  color: var(--muted);
  font-size: 14px;
}
.side-links button.active {
  background: var(--surface);
  box-shadow: 0 1px 3px #00000009;
  color: var(--accent);
  font-weight: 600;
}
.count {
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
}
.study-box {
  margin-top: 32px;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px;
  background: var(--surface);
}
.study-box p {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.7;
  margin: 9px 0 0;
}
.study-box strong {
  font-size: 15px;
}
.progress-track {
  background: var(--soft);
  height: 5px;
  border-radius: 8px;
  margin: 16px 0 8px;
  overflow: hidden;
}
.progress-track span {
  display: block;
  background: var(--accent);
  height: 100%;
}
.eyebrow {
  color: var(--accent);
  font-size: 12px;
  letter-spacing: 1.8px;
  font-weight: 650;
  margin: 0 0 10px;
}
.page-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 27px;
}
.page-title h1 {
  font-size: 30px;
  letter-spacing: -1px;
  margin: 0 0 9px;
  line-height: 1.3;
}
.page-title p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
}
.outline-button,
.primary-button {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 13px;
  background: var(--surface);
  color: var(--text);
  font-size: 14px;
  white-space: nowrap;
}
.primary-button {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.outline-button.selected {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--tint);
}
.toolbar {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}
.search-wrap {
  position: relative;
  flex: 1;
}
.search-wrap span {
  position: absolute;
  left: 15px;
  top: 12px;
  color: var(--muted);
}
.search-wrap input {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  border-radius: 9px;
  height: 45px;
  padding: 0 16px 0 42px;
  font-size: 14px;
}
.toolbar select {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  border-radius: 9px;
  padding: 0 10px;
  max-width: 150px;
  font-size: 14px;
}
.results-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 13px;
}
.results-head label {
  display: flex;
  align-items: center;
  gap: 6px;
}
.cards {
  display: grid;
  gap: 11px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 22px 24px;
  position: relative;
  transition:
    border-color 0.15s,
    transform 0.15s;
}
.card:hover {
  border-color: #ce9f84;
  transform: translateY(-1px);
}
.card-meta {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 12px;
  flex-wrap: wrap;
  font-size: 12px;
  color: var(--muted);
}
.tag {
  padding: 3px 8px;
  border-radius: 5px;
  background: var(--soft);
  font-size: 12px;
  color: var(--muted);
}
.tag.accent {
  background: var(--tint);
  color: var(--accent);
}
.tag.easy {
  color: #328869;
  background: #32886914;
}
.tag.medium {
  color: #af7928;
  background: #af792814;
}
.tag.hard {
  color: #bb505a;
  background: #bb505a14;
}
.card h2 {
  font-size: 16px;
  line-height: 1.7;
  font-weight: 600;
  margin: 0 35px 8px 0;
  overflow-wrap: anywhere;
}
.card p {
  font-size: 13px;
  line-height: 1.7;
  margin: 0;
  color: var(--muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-footer {
  font-size: 12px;
  color: var(--muted);
  margin-top: 15px;
  display: flex;
  justify-content: space-between;
}
.card-footer .read {
  color: var(--accent);
}
.card-save {
  position: absolute;
  right: 16px;
  top: 20px;
  background: transparent;
  border: 0;
  color: var(--muted);
  font-size: 21px;
}
.card-save.saved {
  color: var(--accent);
}
.grid-cards {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 15px;
  margin: 28px 0;
  color: var(--muted);
  font-size: 14px;
}
button:disabled {
  opacity: 0.4;
  cursor: default;
}
.empty {
  text-align: center;
  padding: 70px 20px;
  background: var(--surface);
  border: 1px dashed var(--line);
  border-radius: 12px;
  color: var(--muted);
}
.empty h2 {
  font-size: 20px;
  color: var(--text);
}
.loading {
  padding: 100px;
  text-align: center;
  color: var(--muted);
}
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 22px;
}
.breadcrumb a:hover {
  color: var(--accent);
}
.detail-layout {
  max-width: 1320px;
  margin: auto;
  padding: 32px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 230px;
  gap: 30px;
}
.article-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 38px 44px;
  min-width: 0;
}
.article-title {
  font-size: 27px;
  line-height: 1.6;
  letter-spacing: -0.5px;
  margin: 16px 0 20px;
  overflow-wrap: anywhere;
}
.article-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 28px;
}
.prose {
  font-size: 16px;
  line-height: 1.95;
  overflow-wrap: anywhere;
}
.prose h1 {
  font-size: 25px;
}
.prose h2 {
  font-size: 22px;
  margin: 34px 0 16px;
}
.prose h3 {
  font-size: 18px;
  margin: 28px 0 12px;
}
.prose p {
  margin: 14px 0;
}
.prose a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.prose ul,
.prose ol {
  padding-left: 24px;
}
.prose li {
  margin: 6px 0;
}
.prose blockquote {
  border-left: 3px solid #d4966f;
  margin: 18px 0;
  background: var(--tint);
  padding: 8px 20px;
  color: var(--muted);
}
.prose code {
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.85em;
  background: var(--soft);
  padding: 2px 5px;
  border-radius: 4px;
}
.prose pre {
  position: relative;
  background: var(--code);
  color: #dce5ef;
  border-radius: 9px;
  padding: 40px 20px 20px;
  overflow: auto;
  line-height: 1.7;
  max-width: 100%;
}
.prose pre code {
  background: transparent;
  padding: 0;
  color: inherit;
  white-space: pre;
  overflow-wrap: normal;
}
.copy-code {
  position: absolute;
  right: 10px;
  top: 8px;
  background: #ffffff12;
  color: #dce5ef;
  border: 1px solid #ffffff25;
  border-radius: 5px;
  font-size: 12px;
  padding: 3px 8px;
}
.table-scroll {
  overflow: auto;
  margin: 20px 0;
}
.prose table {
  border-collapse: collapse;
  width: 100%;
  font-size: 14px;
  white-space: normal;
}
.prose td,
.prose th {
  padding: 10px 13px;
  border: 1px solid var(--line);
  text-align: left;
  min-width: 100px;
}
.prose th {
  background: var(--soft);
}
.prose img {
  max-width: 100%;
  border-radius: 8px;
}
.prose hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 28px 0;
}
.katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 9px 0;
}
.toc {
  position: sticky;
  top: 105px;
  align-self: start;
  max-height: 80vh;
  overflow: auto;
}
.toc h3 {
  font-size: 13px;
  color: var(--muted);
  font-weight: 500;
  margin: 15px 0;
}
.toc a {
  display: block;
  padding: 6px 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}
.toc a:hover {
  color: var(--accent);
}
.toc a.sub {
  padding-left: 13px;
}
.toc hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 24px 0;
}
details.answer {
  margin: 24px 0;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 16px 20px;
}
details.answer summary {
  font-size: 15px;
  font-weight: 600;
  color: var(--accent);
  cursor: pointer;
}
.editor {
  margin-top: 30px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--soft);
}
.editor h2 {
  font-size: 18px;
  margin: 0;
}
.editor p {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.7;
}
.editor textarea {
  width: 100%;
  min-height: 300px;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  color: #e6edf3;
  background: var(--code);
  font:
    14px/1.7 Consolas,
    monospace;
  tab-size: 4;
}
.editor-toolbar {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-top: 12px;
  flex-wrap: wrap;
}
.draft-status {
  font-size: 12px;
  color: var(--muted);
  margin-left: auto;
}
.skip {
  position: fixed;
  top: -100px;
  z-index: 99;
  background: var(--surface);
  padding: 12px;
}
.skip:focus {
  top: 0;
}
#toast {
  position: fixed;
  bottom: 25px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--surface);
  border-radius: 8px;
  padding: 12px 20px;
  font-size: 14px;
  z-index: 50;
  display: none;
}
.footer-note {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.8;
  margin-top: 30px;
}
.section-rule {
  width: 24px;
  height: 3px;
  background: var(--accent);
  margin-bottom: 20px;
}
.prose [id] {
  scroll-margin-top: 100px;
}
@media (min-width: 1500px) {
  .layout {
    padding-top: 45px;
  }
}
@media (max-width: 1000px) {
  .header-inner {
    gap: 18px;
    padding: 0 20px;
  }
  nav a {
    padding: 10px;
  }
  .local {
    display: none;
  }
  .layout {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 22px;
    padding: 28px 20px;
  }
  .detail-layout {
    grid-template-columns: minmax(0, 1fr);
    max-width: 960px;
  }
  .toc {
    display: none;
  }
  .article-card {
    padding: 28px;
  }
  .grid-cards {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 700px) {
  header {
    height: auto;
  }
  .header-inner {
    flex-wrap: wrap;
    padding: 12px 16px 0;
    gap: 8px;
  }
  .brand {
    flex: 1;
  }
  nav {
    order: 3;
    width: 100%;
    height: 49px;
    flex: auto;
    gap: 0;
  }
  nav a {
    font-size: 13px;
    padding: 8px 11px;
  }
  .layout {
    display: block;
    padding: 24px 16px;
  }
  .sidebar {
    position: static;
  }
  .side-label,
  .study-box {
    display: none;
  }
  .side-links {
    flex-direction: row;
    overflow-x: auto;
    margin: 0 0 25px;
    gap: 8px;
    padding-bottom: 5px;
  }
  .side-links button {
    width: auto;
    white-space: nowrap;
    padding: 8px 12px;
    border: 1px solid var(--line);
    font-size: 13px;
  }
  .page-title h1 {
    font-size: 26px;
  }
  .page-title {
    align-items: flex-start;
  }
  .page-title p {
    font-size: 13px;
  }
  .toolbar {
    flex-wrap: wrap;
  }
  .search-wrap {
    flex-basis: 100%;
  }
  .toolbar select {
    height: 38px;
    flex: 1;
    max-width: none;
  }
  .card {
    padding: 18px;
  }
  .card h2 {
    font-size: 15px;
  }
  .detail-layout {
    padding: 22px 12px;
  }
  .article-card {
    padding: 22px 18px;
  }
  .article-title {
    font-size: 23px;
  }
  .article-actions .outline-button {
    font-size: 12px;
  }
  .prose {
    font-size: 16px;
  }
  .prose h2 {
    font-size: 20px;
  }
  .editor {
    padding: 14px;
  }
  .eyebrow {
    font-size: 11px;
  }
  .outline-button {
    font-size: 13px;
  }
  .breadcrumb {
    font-size: 12px;
  }
  .loading {
    padding: 80px 20px;
  }
}
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    scroll-behavior: auto !important;
  }
}
.judge-result {
  margin-top: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px 16px;
  white-space: pre-wrap;
  font:
    13px/1.7 Consolas,
    monospace;
  background: var(--surface);
}
.judge-result.running {
  color: var(--muted);
}
.judge-result.accepted {
  color: #24775c;
  border-color: #6ab398;
  background: #eaf7f1;
}
.judge-result.failed {
  color: #a43f49;
  border-color: #d49aa0;
  background: #fff0f1;
}
body.dark .judge-result.accepted {
  color: #8bdfbc;
  background: #17362c;
}
body.dark .judge-result.failed {
  color: #f1a1aa;
  background: #3c2025;
}
.markdown-editor {
  margin-top: 30px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--soft);
}
.markdown-editor-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}
.markdown-editor h2 {
  font-size: 18px;
  margin: 0;
}
.markdown-editor p {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.7;
  margin: 7px 0;
}
.markdown-editor-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.markdown-editor textarea {
  width: 100%;
  min-height: 440px;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  color: #e6edf3;
  background: var(--code);
  font:
    14px/1.7 Consolas,
    monospace;
  tab-size: 4;
}
.markdown-preview {
  margin-top: 20px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}
.markdown-status {
  min-height: 22px;
}
@media (max-width: 700px) {
  .markdown-editor {
    padding: 14px;
  }
  .markdown-editor-head {
    display: block;
  }
  .markdown-editor-actions {
    margin-top: 12px;
  }
  .markdown-editor textarea {
    min-height: 340px;
  }
}