:root {
  color-scheme: light;
  --bg: #f6f1ea;
  --bg-alt: #fefcf8;
  --text: #1f1b16;
  --muted: #6a5f52;
  --accent: #c25a2c;
  --accent-dark: #8f3d1e;
  --card: #ffffff;
  --border: rgba(31, 27, 22, 0.12);
  --shadow: 0 24px 60px rgba(45, 27, 15, 0.16);
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

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

.background {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 18% 20%, rgba(194, 90, 44, 0.16), transparent 45%),
    radial-gradient(circle at 80% 12%, rgba(229, 175, 83, 0.2), transparent 50%),
    radial-gradient(circle at 12% 85%, rgba(31, 27, 22, 0.08), transparent 50%),
    linear-gradient(120deg, #fefcf8 0%, #f6f1ea 45%, #f3e9db 100%);
  z-index: -1;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 28px 48px 18px;
  gap: 24px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 18px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 58px;
  height: 58px;
  border-radius: 18px;
  background: var(--text);
  color: #fff;
  font-weight: 700;
  letter-spacing: 1px;
  font-size: 20px;
}

.brand-title {
  font-size: 22px;
  font-weight: 600;
}

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

.topbar-actions {
  display: flex;
  gap: 12px;
  align-items: center;
}

button,
input {
  font-family: inherit;
}

.ghost,
.cta {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  padding: 10px 16px;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.ghost:hover,
.cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(31, 27, 22, 0.12);
  border-color: rgba(31, 27, 22, 0.2);
}

.cta {
  background: var(--accent);
  color: #fff;
  border-color: transparent;
}

.app {
  display: grid;
  grid-template-columns: minmax(240px, 320px) minmax(0, 1fr);
  gap: 22px;
  padding: 0 48px 48px;
}

.sidebar {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  padding: 20px;
  max-height: calc(100vh - 160px);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

.sidebar-title {
  font-weight: 600;
  font-size: 18px;
}

.sidebar-subtitle {
  color: var(--muted);
  font-size: 13px;
  margin-top: 4px;
}

.search input {
  width: 100%;
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg-alt);
}

.tree {
  margin-top: 18px;
  overflow: auto;
  padding-right: 8px;
  flex: 1;
}

.tree-group,
.tree-leaf {
  display: block;
}

.tree-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.2s ease;
}

.tree-item:hover {
  background: rgba(31, 27, 22, 0.06);
}

.tree-item.active {
  background: rgba(194, 90, 44, 0.16);
  color: var(--accent-dark);
  font-weight: 600;
}

.tree-children {
  margin-left: 18px;
  border-left: 1px dashed rgba(31, 27, 22, 0.2);
  padding-left: 12px;
  display: none;
}

.tree-children.expanded {
  display: block;
}

.caret {
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(-45deg);
  transition: transform 0.2s ease;
}

.caret.expanded {
  transform: rotate(45deg);
}

.tree-label {
  flex: 1;
  font-size: 14px;
}

.tree-meta {
  font-size: 11px;
  color: var(--muted);
}

.content {
  background: var(--card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 24px 28px;
  min-height: 60vh;
  display: flex;
  flex-direction: column;
}

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

.content-title {
  font-size: 20px;
  font-weight: 600;
}

.content-actions {
  display: flex;
  gap: 12px;
}

.content-body {
  margin-top: 18px;
  overflow: auto;
  flex: 1;
  width: 100%;
  min-width: 0;
  box-sizing: border-box;
}

pre {
  margin: 0;
  padding: 0;
  background: transparent;
  border: none;
}

code {
  white-space: pre;
  font-family: "Spline Sans Mono", monospace;
  display: block;
  width: 100%;
}

code pre {
  margin: 0;
  padding: 0;
  white-space: pre-wrap;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

#codeContainer {
  margin: 0;
  padding: 18px 20px;
  border-radius: 16px;
  background: #fdf9f2;
  border: 1px solid rgba(31, 27, 22, 0.12);
  font-family: "Spline Sans Mono", monospace;
  font-size: 13.5px;
  line-height: 1.7;
  letter-spacing: 0;
  tab-size: 4;
  overflow-x: auto;
  color: #2d241d;
  width: 100%;
  box-sizing: border-box;
}

.code-lines {
  display: block;
  width: 100%;
}

.code-line {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 12px;
  align-items: baseline;
  width: 100%;
}

.line-number {
  text-align: right;
  color: rgba(31, 27, 22, 0.45);
  user-select: none;
  flex-shrink: 0;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.line-content {
  white-space: pre;
}

.image-viewer {
  background: #fdf9f2;
  border: 1px solid rgba(31, 27, 22, 0.12);
  border-radius: 16px;
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.image-viewer img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 12px 30px rgba(31, 27, 22, 0.18);
}

.markdown {
  background: #fdf9f2;
  border: 1px solid rgba(31, 27, 22, 0.12);
  border-radius: 16px;
  padding: 28px;
  line-height: 1.8;
  font-size: 15px;
  color: var(--text);
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.markdown h1,
.markdown h2,
.markdown h3 {
  margin-top: 24px;
  margin-bottom: 12px;
}

.markdown h1 {
  font-size: 26px;
}

.markdown h2 {
  font-size: 22px;
}

.markdown h3 {
  font-size: 18px;
}

.markdown p {
  margin: 12px 0;
  color: #2d241d;
}

.markdown ul,
.markdown ol {
  padding-left: 22px;
  margin: 12px 0;
}

.markdown li {
  margin: 6px 0;
}

.markdown code {
  font-family: "Spline Sans Mono", monospace;
  background: rgba(31, 27, 22, 0.08);
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 0.9em;
}

.markdown pre {
  margin: 16px 0;
  padding: 18px;
  background: #f7f2ea;
  border-radius: 12px;
  overflow-x: auto;
}

.markdown a {
  color: var(--accent-dark);
  text-decoration: none;
  border-bottom: 1px solid rgba(143, 61, 30, 0.3);
}

.markdown a:hover {
  border-bottom-color: rgba(143, 61, 30, 0.8);
}

.content-footer {
  margin-top: 16px;
  color: var(--muted);
  font-size: 13px;
}

.tree-group.hidden,
.tree-leaf.hidden,
.hidden {
  display: none !important;
}

@media (max-width: 980px) {
  .app {
    grid-template-columns: 1fr;
  }

  .sidebar {
    max-height: none;
  }
}

@media (max-width: 720px) {
  .topbar {
    padding: 20px 24px 12px;
  }

  .app {
    padding: 0 24px 32px;
  }

  .topbar-actions {
    width: 100%;
    justify-content: flex-start;
  }
}