:root {
  color-scheme: light;
  --bg: #f2efe8;
  --panel: rgba(255, 252, 246, 0.82);
  --panel-strong: #fffdf8;
  --border: rgba(57, 45, 32, 0.12);
  --text: #1f1a16;
  --muted: #695948;
  --accent: #b2572c;
  --accent-soft: rgba(178, 87, 44, 0.12);
  --shadow: 0 18px 50px rgba(51, 34, 16, 0.12);
  --code-bg: #f6f1e8;
  --radius: 24px;
  --sidebar-width: 320px;
  font-family:
    "PingFang TC",
    "PingFang HK",
    "Noto Sans CJK TC",
    "Microsoft JhengHei",
    "Helvetica Neue",
    sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top left, rgba(255, 190, 123, 0.24), transparent 28%),
    radial-gradient(circle at bottom right, rgba(194, 214, 137, 0.26), transparent 24%),
    linear-gradient(180deg, #f9f5ee 0%, var(--bg) 100%);
  color: var(--text);
}

body {
  min-height: 100vh;
}

body,
input,
button,
a {
  font-family: inherit;
}

code,
pre {
  font-family: "SFMono-Regular", "Menlo", "Monaco", monospace;
}

.shell {
  display: grid;
  grid-template-columns: minmax(280px, var(--sidebar-width)) 1fr;
  gap: 20px;
  min-height: 100vh;
  padding: 20px;
  transition: grid-template-columns 180ms ease;
}

.shell.is-sidebar-collapsed {
  grid-template-columns: 1fr;
}

.shell.is-sidebar-collapsed .sidebar {
  display: none;
}

.sidebar,
.viewer {
  backdrop-filter: blur(14px);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.sidebar {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.sidebar__top {
  padding: 24px 20px 18px;
  border-bottom: 1px solid var(--border);
}

.eyebrow,
.viewer__badge {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.sidebar h1,
.viewer h2 {
  margin: 0;
  font-family:
    "SF Pro Display",
    "Avenir Next",
    "Helvetica Neue",
    sans-serif;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.sidebar h1 {
  font-size: clamp(2rem, 4vw, 2.6rem);
}

.sidebar__intro,
.viewer__meta {
  margin: 12px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.search {
  display: grid;
  gap: 8px;
  margin-top: 18px;
}

.search__label {
  font-size: 0.85rem;
  color: var(--muted);
}

.search input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.72);
  padding: 12px 14px;
  color: var(--text);
  font-size: 0.95rem;
}

.search input:focus {
  outline: 2px solid rgba(178, 87, 44, 0.16);
  border-color: rgba(178, 87, 44, 0.4);
}

.file-tree {
  flex: 1;
  overflow: auto;
  padding: 12px;
}

.tree-folder {
  margin-bottom: 10px;
}

.tree-folder__label,
.tree-file {
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--text);
  text-align: left;
  border-radius: 14px;
  padding: 10px 12px;
}

.tree-folder__label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 700;
  cursor: pointer;
}

.tree-folder__label:hover,
.tree-file:hover,
.tree-file.is-active {
  background: var(--accent-soft);
}

.tree-folder__children {
  margin-top: 4px;
  padding-left: 12px;
  border-left: 1px dashed rgba(105, 89, 72, 0.24);
}

.tree-file {
  display: grid;
  gap: 4px;
  cursor: pointer;
}

.tree-file__name {
  font-weight: 600;
  word-break: break-word;
}

.tree-file__meta {
  color: var(--muted);
  font-size: 0.8rem;
}

.viewer {
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow: hidden;
}

.viewer__top {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 28px 18px;
  border-bottom: 1px solid var(--border);
}

.viewer__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: flex-start;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 112px;
  padding: 11px 16px;
  border: 1px solid transparent;
  border-radius: 999px;
  text-decoration: none;
  background: var(--accent);
  color: #fffdf9;
  font-weight: 700;
  box-shadow: 0 10px 24px rgba(178, 87, 44, 0.22);
  cursor: pointer;
}

.button--ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: none;
}

.viewer__body {
  flex: 1;
  overflow: auto;
  padding: 28px;
}

.empty-state,
.docx-preview,
.markdown-body,
.plain-preview,
.fallback-card,
.loading-card,
.error-card {
  max-width: 920px;
  margin: 0 auto;
}

.empty-state,
.fallback-card,
.loading-card,
.error-card {
  border: 1px solid var(--border);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.64);
  padding: 26px;
}

.empty-state__lead {
  margin-top: 0;
  font-size: 1.2rem;
  font-weight: 700;
}

.plain-preview {
  border: 1px solid var(--border);
  border-radius: 22px;
  background: var(--code-bg);
  padding: 0;
  overflow: auto;
}

.plain-preview pre,
.markdown-body pre {
  position: relative;
  margin: 0;
  padding: 3.1rem 1.15rem 1.15rem;
  overflow: auto;
  background: var(--code-bg);
  color: #2d241d;
}

.plain-preview code,
.markdown-body pre code {
  display: block;
  font-size: 0.92rem;
  line-height: 1.7;
  white-space: pre;
  word-break: normal;
}

.markdown-body {
  border: 1px solid var(--border);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.72);
  padding: 30px;
  line-height: 1.75;
  font-size: 1rem;
}

.markdown-body > :first-child {
  margin-top: 0;
}

.markdown-body > :last-child {
  margin-bottom: 0;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  font-family:
    "SF Pro Display",
    "Avenir Next",
    "Helvetica Neue",
    sans-serif;
  letter-spacing: -0.03em;
  line-height: 1.2;
  scroll-margin-top: 1rem;
}

.markdown-body h1 {
  margin: 0 0 1.2rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid rgba(57, 45, 32, 0.12);
  font-size: clamp(1.9rem, 2.8vw, 2.5rem);
}

.markdown-body h2 {
  margin: 2.2rem 0 1rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid rgba(57, 45, 32, 0.1);
  font-size: clamp(1.45rem, 2vw, 1.85rem);
}

.markdown-body h3 {
  margin: 1.8rem 0 0.8rem;
  font-size: 1.25rem;
}

.markdown-body h4 {
  margin: 1.3rem 0 0.6rem;
  font-size: 1.05rem;
}

.markdown-body p,
.markdown-body ul,
.markdown-body ol {
  margin: 1rem 0;
}

.markdown-body ul,
.markdown-body ol {
  padding-left: 1.5rem;
}

.markdown-body li + li {
  margin-top: 0.35rem;
}

.markdown-body a {
  color: var(--accent);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.16em;
}

.markdown-body strong {
  color: #17110e;
}

.markdown-body em {
  color: #5c4b3f;
}

.markdown-body :not(pre) > code {
  padding: 0.12rem 0.45rem;
  border: 1px solid rgba(57, 45, 32, 0.1);
  border-radius: 0.5rem;
  background: #f3ede3;
  color: #7d3212;
  font-size: 0.94em;
}

.markdown-body table {
  display: block;
  width: 100%;
  border-collapse: collapse;
  margin: 1.4rem 0;
  border-radius: 14px;
  overflow: hidden;
  overflow-x: auto;
  background: #fff;
  box-shadow: inset 0 0 0 1px rgba(57, 45, 32, 0.08);
}

.markdown-body thead {
  background: #f8f3eb;
}

.markdown-body th,
.markdown-body td {
  border: 1px solid rgba(57, 45, 32, 0.12);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

.markdown-body pre {
  border: 1px solid rgba(57, 45, 32, 0.12);
  border-radius: 16px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.45);
}

.markdown-body pre code {
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  font-size: inherit;
}

.markdown-body blockquote {
  margin: 1.4rem 0;
  padding: 0.15rem 0 0.15rem 1rem;
  border-left: 4px solid rgba(178, 87, 44, 0.35);
  color: #5f5447;
  background: linear-gradient(90deg, rgba(178, 87, 44, 0.08), transparent);
}

.markdown-body hr {
  border: 0;
  border-top: 1px solid rgba(57, 45, 32, 0.12);
  margin: 2rem 0;
}

.markdown-body img,
.asset-preview img {
  max-width: 100%;
  border-radius: 18px;
}

.docx-preview {
  border: 1px solid var(--border);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.75);
  padding: 30px;
  line-height: 1.75;
}

.docx-preview p:first-child,
.fallback-card p:first-child,
.error-card p:first-child {
  margin-top: 0;
}

.asset-preview iframe {
  width: 100%;
  min-height: 75vh;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: #fff;
}

.hint {
  color: var(--muted);
}

.code-block__badge {
  position: absolute;
  top: 0.8rem;
  right: 0.9rem;
  z-index: 1;
  padding: 0.18rem 0.5rem;
  border: 1px solid rgba(57, 45, 32, 0.12);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  color: #7d3212;
  font-family: "SFMono-Regular", "Menlo", "Monaco", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.hljs {
  background: transparent;
  color: #2d241d;
}

@media (max-width: 900px) {
  .shell {
    grid-template-columns: 1fr;
    padding: 14px;
  }

  .sidebar {
    min-height: 40vh;
  }

  .viewer__top,
  .viewer__body {
    padding-left: 18px;
    padding-right: 18px;
  }

  .markdown-body,
  .docx-preview {
    padding: 18px;
  }

  .markdown-body {
    padding: 24px 20px;
  }

  .plain-preview {
    padding: 0;
  }

  .plain-preview pre,
  .markdown-body pre {
    padding-left: 0.9rem;
    padding-right: 0.9rem;
  }
}