:root {
  color-scheme: light;
  --ink: #151515;
  --muted: #6d655c;
  --paper: #f7f1e8;
  --panel: #fffaf1;
  --line: #ded4c5;
  --accent: #d94f30;
  --accent-dark: #9d2e1b;
  --code: #27221d;
  --code-bg: #eee3d4;
  --shadow: 0 24px 70px rgba(35, 28, 20, 0.14);
  font-family: Georgia, "Times New Roman", serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(21, 21, 21, 0.035) 1px, transparent 1px) 0 0 / 28px 28px,
    linear-gradient(var(--paper), var(--paper));
}

button,
input {
  font: inherit;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(300px, 370px) minmax(0, 1fr);
  min-height: 100vh;
}

.library {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: max(18px, env(safe-area-inset-top)) 18px 18px max(18px, env(safe-area-inset-left));
  border-right: 1px solid var(--line);
  background: rgba(255, 250, 241, 0.92);
  backdrop-filter: blur(18px);
  overflow: hidden;
}

.library-header,
.reader-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--accent-dark);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  line-height: 1;
}

h1 {
  font-size: 28px;
}

h2 {
  font-size: clamp(22px, 3vw, 42px);
}

.status-badge {
  flex: 0 0 auto;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: #fff;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 12px;
  font-weight: 750;
}

.status-badge.ready {
  color: #12633d;
  border-color: #9fd4b5;
  background: #eefaf2;
}

.status-badge.offline {
  color: #7a3f00;
  border-color: #e6c28f;
  background: #fff5df;
}

.search-box {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.search-box input {
  width: 100%;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: #fff;
  outline: none;
}

.search-box input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(217, 79, 48, 0.15);
}

.file-list {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 8px;
  min-height: 0;
  padding-right: 4px;
  overflow-y: auto;
}

.group-label {
  margin: 12px 0 2px;
  color: var(--muted);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 11px;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.file-button {
  width: 100%;
  min-height: 50px;
  padding: 10px 12px;
  border: 1px solid transparent;
  border-radius: 8px;
  color: var(--ink);
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.file-button:hover,
.file-button.active {
  border-color: var(--line);
  background: #fff;
}

.file-button.active {
  box-shadow: inset 3px 0 0 var(--accent);
}

.file-button strong {
  display: block;
  line-height: 1.18;
  font-size: 15px;
}

.file-button span {
  display: block;
  margin-top: 5px;
  color: var(--muted);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 12px;
}

.reader {
  min-width: 0;
  padding: max(18px, env(safe-area-inset-top)) max(18px, env(safe-area-inset-right)) 56px 18px;
}

.reader-toolbar {
  position: sticky;
  top: 0;
  z-index: 2;
  padding: 18px clamp(18px, 4vw, 56px);
  margin: -18px max(-18px, calc(env(safe-area-inset-right) * -1)) 0 -18px;
  border-bottom: 1px solid rgba(222, 212, 197, 0.76);
  background: rgba(247, 241, 232, 0.88);
  backdrop-filter: blur(18px);
}

.icon-button {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.icon-button span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: var(--ink);
}

.content {
  max-width: 860px;
  margin: 0 auto;
  padding: clamp(26px, 6vw, 72px) clamp(2px, 2vw, 26px);
  font-size: clamp(18px, 2vw, 21px);
  line-height: 1.68;
}

.content > *:first-child {
  margin-top: 0;
}

.content h1,
.content h2,
.content h3 {
  line-height: 1.1;
}

.content h1 {
  margin: 0 0 20px;
  font-size: clamp(34px, 7vw, 76px);
}

.content h2 {
  margin: 42px 0 14px;
  font-size: clamp(27px, 4vw, 44px);
}

.content h3 {
  margin: 30px 0 10px;
  font-size: clamp(22px, 3vw, 30px);
}

.content p,
.content ul,
.content ol,
.content table,
.content blockquote,
.content pre {
  margin: 0 0 20px;
}

.content ul,
.content ol {
  padding-left: 1.35em;
}

.content li + li {
  margin-top: 6px;
}

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

.content blockquote {
  padding: 16px 20px;
  border-left: 5px solid var(--accent);
  background: rgba(255, 250, 241, 0.72);
}

.content code {
  padding: 0.12em 0.32em;
  border-radius: 5px;
  color: var(--code);
  background: var(--code-bg);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88em;
}

.content pre {
  overflow-x: auto;
  padding: 18px;
  border-radius: 8px;
  color: #fff7eb;
  background: var(--code);
  box-shadow: var(--shadow);
}

.content pre code {
  padding: 0;
  color: inherit;
  background: transparent;
}

.table-wrap {
  overflow-x: auto;
  margin: 0 0 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92em;
}

th,
td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: #f0e5d7;
}

.empty-state {
  max-width: 620px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

body.nav-open {
  overflow: hidden;
}

@media (max-width: 820px) {
  .app-shell {
    display: block;
  }

  .library {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 5;
    width: min(88vw, 380px);
    transform: translateX(-102%);
    transition: transform 180ms ease;
    box-shadow: var(--shadow);
  }

  body.nav-open .library {
    transform: translateX(0);
  }

  .reader {
    padding-left: max(16px, env(safe-area-inset-left));
  }

  .reader-toolbar {
    padding: 14px 16px;
    align-items: flex-start;
    justify-content: flex-start;
  }

  .icon-button {
    display: block;
    flex: 0 0 auto;
  }

  .content {
    padding-top: 30px;
  }
}