:root {
  color-scheme: light;
  --bg: #fbfaf8;
  --panel: #ffffff;
  --panel-soft: #fff7f2;
  --ink: #242326;
  --muted: #77737d;
  --line: #ebe4de;
  --accent: #ee6b3a;
  --accent-soft: #fff0e8;
  --shadow: 0 18px 50px rgba(43, 35, 28, 0.08);
  --radius: 18px;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #111012;
  --panel: #19171b;
  --panel-soft: #241b18;
  --ink: #f4eee8;
  --muted: #aaa1ad;
  --line: #2d292f;
  --accent: #ff8756;
  --accent-soft: #2a1b16;
  --shadow: 0 18px 54px rgba(0, 0, 0, 0.32);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top right, #fff3eb 0, transparent 34rem), var(--bg);
}

:root[data-theme="dark"] body {
  background: radial-gradient(circle at top right, rgba(255, 135, 86, 0.18) 0, transparent 34rem), var(--bg);
}

button,
input,
select { font: inherit; }

.shell {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 24px 22px;
  border-right: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(20px);
  overflow-y: auto;
}

:root[data-theme="dark"] .sidebar {
  background: rgba(20, 18, 22, 0.78);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 30px;
  color: var(--ink);
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(145deg, #101014, #323037);
  box-shadow: inset 0 1px rgba(255,255,255,0.18), 0 12px 22px rgba(0,0,0,0.14);
  overflow: hidden;
}

:root[data-theme="dark"] .brand-mark {
  background: #f4eee8;
}

.brand-mark img {
  width: 26px;
  height: 26px;
  object-fit: contain;
}

.brand strong,
.brand small { display: block; }

.brand strong {
  font-size: 17px;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.brand small {
  margin-top: 2px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
}

.filter-group { margin: 0 0 28px; }

.filter-title {
  margin: 0 0 10px;
  color: #8a858d;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.filter-list,
.quick-filters {
  display: flex;
  gap: 8px;
}

.sidebar .filter-list { flex-direction: column; }

.filter-button,
.ghost-button,
.suggest-button,
.more-filters,
.sort-control select {
  border: 1px solid var(--line);
  border-radius: 12px;
  color: #5f5a65;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: 0 8px 20px rgba(34, 28, 24, 0.035);
}

:root[data-theme="dark"] .filter-button,
:root[data-theme="dark"] .ghost-button,
:root[data-theme="dark"] .suggest-button,
:root[data-theme="dark"] .more-filters,
:root[data-theme="dark"] .sort-control select {
  background: rgba(28, 25, 31, 0.9);
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.22);
}

.filter-button {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 11px 13px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 650;
  text-align: left;
  transition: 160ms ease;
}

.button-icon {
  display: grid;
  place-items: center;
  width: 19px;
  height: 19px;
  flex: 0 0 auto;
}

.button-icon img {
  width: 18px;
  height: 18px;
  object-fit: contain;
}

.filter-button:hover,
.filter-button.active {
  color: var(--accent);
  border-color: #ffd7c5;
  background: var(--accent-soft);
}

:root[data-theme="dark"] .filter-button:hover,
:root[data-theme="dark"] .filter-button.active {
  border-color: rgba(255, 135, 86, 0.36);
  background: rgba(255, 135, 86, 0.13);
}

.filter-button.active .button-icon { color: var(--accent); }

.main {
  width: min(100%, 1110px);
  margin: 0 auto;
  padding: 12px 28px 28px;
}

.topbar {
  display: flex;
  justify-content: flex-end;
  min-height: 44px;
  margin-bottom: 12px;
}

.suggest-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 36px;
  padding: 0 15px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 750;
  text-decoration: none;
  cursor: pointer;
}

.search-panel {
  position: sticky;
  top: 12px;
  z-index: 5;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  overflow: hidden;
}

:root[data-theme="dark"] .search-panel {
  background: rgba(25, 23, 27, 0.9);
}

.search-box {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
}

.search-box svg {
  width: 20px;
  height: 20px;
  fill: #77737d;
  flex: 0 0 auto;
}

.search-box input {
  width: 100%;
  border: 0;
  outline: 0;
  color: var(--ink);
  background: transparent;
  font-size: 15px;
}

.search-box input::placeholder { color: #a4a0a8; }

kbd {
  min-width: 30px;
  padding: 6px 9px;
  border: 1px solid var(--line);
  border-radius: 9px;
  color: #9a939c;
  background: #faf7f4;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
  text-align: center;
}

:root[data-theme="dark"] kbd {
  background: #221f25;
}

.quick-filters {
  flex-wrap: wrap;
  padding: 0 0 14px 14px;
}

.quick-filters .filter-button {
  width: auto;
  min-height: 36px;
  padding: 8px 14px;
  border-radius: 12px;
}

.more-filters {
  align-self: start;
  margin: 0 14px 14px 0;
  padding: 10px 16px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
}

.more-filters::before {
  content: "▽";
  margin-right: 8px;
  color: #77737d;
}

.results-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin: 22px 0 14px;
}

.results-heading h2 {
  margin: 0;
  font-size: 25px;
  line-height: 1.1;
  letter-spacing: -0.05em;
}

.results-heading p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.ghost-button {
  margin-left: auto;
  padding: 9px 12px;
  cursor: pointer;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
}

.ghost-button[hidden] { display: none; }

.sort-control {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
}

.sort-control select {
  padding: 9px 30px 9px 12px;
  appearance: none;
  cursor: pointer;
  font-size: 13px;
  font-weight: 650;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.card {
  display: flex;
  min-height: 230px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255,255,255,0.86);
  box-shadow: 0 14px 34px rgba(43, 35, 28, 0.06);
  flex-direction: column;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

:root[data-theme="dark"] .card {
  background: rgba(25, 23, 27, 0.92);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 22px 46px rgba(43, 35, 28, 0.09);
}

.card-top,
.tool-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.card-top {
  justify-content: space-between;
  margin-bottom: 16px;
}

.pill,
.difficulty,
.tool-row span {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 800;
}

.pill {
  padding: 6px 10px;
  color: #6952c7;
  background: #f1ecff;
}

:root[data-theme="dark"] .pill {
  color: #c8b9ff;
  background: rgba(116, 84, 210, 0.18);
}

.difficulty {
  padding: 6px 10px;
  color: var(--accent);
  border: 1px solid #ffd7c5;
  background: #fff8f4;
}

:root[data-theme="dark"] .difficulty {
  border-color: rgba(255, 135, 86, 0.34);
  background: rgba(255, 135, 86, 0.12);
}

.difficulty.beginner {
  color: #24814f;
  border-color: #d7f0df;
  background: #effaf3;
}

:root[data-theme="dark"] .difficulty.beginner {
  color: #76d89d;
  border-color: rgba(118, 216, 157, 0.28);
  background: rgba(118, 216, 157, 0.1);
}

.difficulty.intermediate {
  color: #a66b12;
  border-color: #fde6b8;
  background: #fff8e8;
}

:root[data-theme="dark"] .difficulty.intermediate {
  color: #f3bf61;
  border-color: rgba(243, 191, 97, 0.28);
  background: rgba(243, 191, 97, 0.1);
}

.card h3 {
  margin: 0;
  font-size: 17px;
  line-height: 1.3;
  letter-spacing: -0.035em;
}

.card p {
  margin: 12px 0 16px;
  color: #696470;
  font-size: 13.5px;
  line-height: 1.58;
}

.tool-row { margin-top: auto; }

.tool-row span {
  gap: 6px;
  padding: 6px 9px;
  color: #6d6871;
  background: #f6f4f2;
}

:root[data-theme="dark"] .tool-row span {
  background: #221f25;
}

.tool-row i {
  display: grid;
  place-items: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: transparent;
  font-style: normal;
  overflow: hidden;
}

.tool-row i img {
  width: 18px;
  height: 18px;
  object-fit: contain;
}

.card-link {
  display: inline-flex;
  width: fit-content;
  margin-top: 18px;
  color: #d94f1f;
  font-size: 14px;
  font-weight: 850;
  text-decoration: none;
}

.card-link:hover { text-decoration: underline; }

.empty {
  padding: 52px 18px;
  text-align: center;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.7);
}

:root[data-theme="dark"] .empty {
  background: rgba(25, 23, 27, 0.72);
}

.empty h2 { margin: 0; }
.empty p { color: var(--muted); }

.detail-page {
  width: min(760px, 100%);
  margin: 0 auto;
  padding: 36px 18px;
}

.back-link {
  display: inline-flex;
  margin-bottom: 14px;
  color: var(--accent);
  font-weight: 800;
  text-decoration: none;
}

.detail-card {
  padding: clamp(22px, 4vw, 42px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--shadow);
}

:root[data-theme="dark"] .detail-card {
  background: rgba(25, 23, 27, 0.92);
}

.detail-card h1 {
  margin: 0 0 16px;
  font-size: clamp(32px, 7vw, 54px);
  line-height: 1;
  letter-spacing: -0.06em;
}

.detail-card h2,
.detail-card h3 {
  margin: 30px 0 10px;
  letter-spacing: -0.04em;
}

.detail-card p,
.detail-card li {
  color: #696470;
  font-size: 16px;
  line-height: 1.7;
}

.detail-card a { color: var(--accent); font-weight: 800; }

.detail-card pre {
  position: relative;
  overflow-x: auto;
  padding: 48px 16px 16px;
  border-radius: 14px;
  color: #fff;
  background: #1f1e22;
}

.copy-code {
  position: absolute;
  top: 12px;
  right: 12px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 9px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 9px;
  color: #f4eee8;
  background: rgba(255, 255, 255, 0.08);
  cursor: pointer;
  font-size: 12px;
  font-weight: 750;
}

.copy-code::before {
  content: "";
  width: 14px;
  height: 14px;
  background: currentColor;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M8 7a3 3 0 0 1 3-3h6a3 3 0 0 1 3 3v6a3 3 0 0 1-3 3h-1v1a3 3 0 0 1-3 3H7a3 3 0 0 1-3-3v-6a3 3 0 0 1 3-3h1V7Zm2 1h3a3 3 0 0 1 3 3v3h1a1 1 0 0 0 1-1V7a1 1 0 0 0-1-1h-6a1 1 0 0 0-1 1v1Zm-3 2a1 1 0 0 0-1 1v6a1 1 0 0 0 1 1h6a1 1 0 0 0 1-1v-6a1 1 0 0 0-1-1H7Z'/%3E%3C/svg%3E") center / contain no-repeat;
}

.copy-code:hover {
  background: rgba(255, 255, 255, 0.14);
}

:root[data-theme="dark"] .detail-card pre {
  background: #0d0c0f;
}

.detail-card blockquote {
  margin: 20px 0;
  padding: 14px 16px;
  border-left: 4px solid var(--accent);
  border-radius: 12px;
  color: #5f5a65;
  background: var(--accent-soft);
}

.doc-image {
  margin: 24px 0;
}

.doc-image img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 18px 44px rgba(43, 35, 28, 0.1);
}

.doc-image figcaption {
  margin-top: 8px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

.doc-table-wrap {
  max-width: 100%;
  margin: 24px 0;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  box-shadow: 0 14px 34px rgba(43, 35, 28, 0.06);
}

:root[data-theme="dark"] .doc-table-wrap {
  background: #19171b;
}

.doc-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 560px;
}

.doc-table th,
.doc-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.doc-table th {
  color: var(--ink);
  background: #fff7f2;
  font-size: 13px;
  font-weight: 850;
}

:root[data-theme="dark"] .doc-table th {
  background: #241b18;
}

.doc-table td {
  color: #696470;
  font-size: 14px;
  line-height: 1.55;
}

.doc-table tr:last-child td {
  border-bottom: 0;
}

.detail-card code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }

.detail-card p code,
.detail-card li code {
  padding: 2px 5px;
  border-radius: 6px;
  color: var(--accent);
  background: var(--accent-soft);
}

@media (max-width: 1060px) {
  .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 800px) {
  .shell { display: block; }
  .sidebar {
    position: static;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .sidebar .filter-list { flex-direction: row; flex-wrap: wrap; }
  .sidebar .filter-button { width: auto; }
  .main { padding: 14px; }
  .topbar { justify-content: flex-start; }
  .search-panel { position: static; grid-template-columns: 1fr; }
  .more-filters { display: none; }
  .results-heading { align-items: flex-start; flex-direction: column; }
  .ghost-button { margin-left: 0; }
  .cards { grid-template-columns: 1fr; }
}