:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --surface-soft: #f9fbff;
  --text: #182236;
  --muted: #61708f;
  --border: #dce4f2;
  --accent: #1d4ed8;
  --accent-2: #0891b2;
  --ok: #0f766e;
  --danger: #b91c1c;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.09);
  --radius: 16px;
  --font: 'Plus Jakarta Sans', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  height: 100vh;
  padding: 10px;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(circle at 10% 20%, rgba(8, 145, 178, 0.12), transparent 30%),
    radial-gradient(circle at 80% 0%, rgba(29, 78, 216, 0.12), transparent 35%),
    var(--bg);
  overflow: hidden;
}

.page {
  width: 100%;
  height: 100%;
  margin: 0;
  display: grid;
  grid-template-rows: auto auto 1fr;
  min-height: 0;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
}

.controls {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 8px 12px;
  display: grid;
  gap: 0;
}

.tab {
  border: 0;
  border-radius: 10px;
  padding: 10px 14px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.tab:hover {
  transform: translateY(-1px);
}

.view-switch {
  display: inline-flex;
  gap: 6px;
  padding: 4px;
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
  width: fit-content;
}

.toolbar-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
}

.raw-actions {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.raw-actions.hidden {
  display: none;
}

.action-btn {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 10px;
  padding: 9px 12px;
  font-weight: 700;
  cursor: pointer;
}

.action-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.tab {
  background: transparent;
  color: var(--muted);
}

.tab.active {
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 4px 10px rgba(15, 23, 42, 0.08);
}

.meta {
  margin-top: 0;
  display: grid;
  gap: 4px;
  padding: 8px 12px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.meta p {
  margin: 0;
}

#activeFile {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--muted);
}

#status {
  font-size: 0.92rem;
  color: var(--ok);
}

#status:empty {
  display: none;
}

#status.error {
  color: var(--danger);
}

.recent {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding-top: 4px;
}

.recent.hidden {
  display: none;
}

.recent span {
  font-size: 0.82rem;
  color: var(--muted);
  font-weight: 600;
}

.recent-files {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.recent-files button {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 999px;
  padding: 5px 10px;
  font-size: 0.78rem;
  font-family: var(--mono);
  color: var(--text);
  cursor: pointer;
}

.viewer-wrap {
  background: var(--surface);
  padding: 0;
  min-height: 0;
}

.viewer {
  min-height: 0;
  height: 100%;
  max-height: none;
  overflow: auto;
  border: 0;
  border-radius: 0;
  background: #fff;
  padding: 8px 12px;
}

.viewer.raw {
  font-family: var(--mono);
  white-space: pre-wrap;
  line-height: 1.55;
}

.markdown-body {
  line-height: 1.7;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  margin: 1.1em 0 0.4em;
  line-height: 1.3;
}

.markdown-body p {
  margin: 0.7em 0;
}

.markdown-body ul,
.markdown-body ol {
  margin: 0.7em 0;
  padding-left: 1.4em;
}

.markdown-body blockquote {
  margin: 1em 0;
  padding: 0.5em 0.9em;
  border-left: 4px solid var(--accent);
  background: #f6f9ff;
  color: #354463;
}

.markdown-body code {
  font-family: var(--mono);
  background: #eef3ff;
  padding: 0.15em 0.35em;
  border-radius: 5px;
}

.markdown-body pre {
  background: #0f172a;
  color: #e2e8f0;
  padding: 14px;
  border-radius: 10px;
  overflow: auto;
}

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

.markdown-body a {
  color: var(--accent);
}

@media (max-width: 700px) {
  body {
    padding: 6px;
  }

  .page {
    height: 100%;
  }

  .toolbar-row {
    align-items: stretch;
  }

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