*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Sans', sans-serif;
  background: #f1f5f9;
  color: #1e293b;
  min-height: 100vh;
}

/* ── nav bar ── */
nav {
  background: #1e293b;
  color: #fff;
  display: flex;
  align-items: center;
  padding: .6rem 1.25rem;
  gap: 1.5rem;
  flex-shrink: 0;
}
nav a        { color: #94a3b8; text-decoration: none; font-size: .875rem; }
nav a:hover  { color: #fff; }
nav .brand   { font-weight: 700; font-size: 1rem; color: #fff; margin-right: auto; }

/* ── page wrapper ── */
.page { max-width: 900px; margin: 2rem auto; padding: 0 1rem; }

/* ── card grid (portal) ── */
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; margin-top: 1.5rem; }
a.card {
  display: block; background: #fff; border-radius: 10px; padding: 1.4rem 1.5rem;
  text-decoration: none; color: inherit;
  box-shadow: 0 1px 3px rgba(0,0,0,.08);
  transition: box-shadow .15s, transform .15s;
}
a.card:hover { box-shadow: 0 4px 12px rgba(0,0,0,.14); transform: translateY(-2px); }
.card-icon  { font-size: 2rem; margin-bottom: .5rem; }
.card-title { font-size: 1rem; font-weight: 700; margin-bottom: .25rem; }
.card-path  { font-family: monospace; font-size: .75rem; color: #4f46e5; margin-bottom: .4rem; }
.card-desc  { font-size: .85rem; color: #64748b; }

/* ── section heading ── */
.page h1 { font-size: 1.4rem; margin-bottom: 1rem; }
.page h2 { font-size: 1rem; margin: 1.5rem 0 .5rem; color: #475569; }

/* ── badge ── */
.badge { display: inline-block; padding: .2em .7em; border-radius: 99px; background: #2ecc71; color: #fff; font-size: .8rem; vertical-align: middle; }

/* ── pre / code ── */
pre  { background: #1e293b; color: #e2e8f0; padding: 1rem; border-radius: 6px; overflow-x: auto; font-size: .85rem; line-height: 1.6; }
code { background: #f1f5f9; padding: .15em .4em; border-radius: 4px; font-size: .875em; }

/* ── table ── */
table { border-collapse: collapse; width: 100%; font-size: .9rem; }
td, th { border: 1px solid #e2e8f0; padding: .5rem .75rem; text-align: left; }
th { background: #f8fafc; font-weight: 600; }

/* ── buttons ── */
.btn         { padding: .45rem 1.1rem; border: none; border-radius: 6px; font-size: .9rem; cursor: pointer; }
.btn-primary { background: #4f46e5; color: #fff; }
.btn-primary:hover { background: #4338ca; }
.btn-ghost   { background: #e2e8f0; color: #334155; }
.btn-ghost:hover { background: #cbd5e1; }

/* ── text tools ── */
.split-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.split-2 textarea { width: 100%; height: 200px; padding: .75rem; border: 1px solid #cbd5e1; border-radius: 6px; font-size: 1rem; font-family: inherit; resize: vertical; }
.toolbar { display: flex; gap: .5rem; align-items: center; flex-wrap: wrap; margin: .75rem 0; }
.char-count { font-size: .75rem; color: #94a3b8; margin-left: auto; }
select { padding: .45rem .7rem; border: 1px solid #cbd5e1; border-radius: 6px; font-size: .9rem; }

/* ── markdown split view ── */
body.md-layout { display: flex; flex-direction: column; height: 100vh; overflow: hidden; }
.md-split { display: grid; grid-template-columns: 1fr 1fr; gap: 2px; background: #cbd5e1; flex: 1; overflow: hidden; }
.md-pane  { background: #fff; display: flex; flex-direction: column; overflow: hidden; }
.md-pane-title { padding: .4rem .75rem; font-size: .75rem; font-weight: 600; text-transform: uppercase; letter-spacing: .05em; color: #64748b; background: #f8fafc; border-bottom: 1px solid #e2e8f0; flex-shrink: 0; }
.md-pane form { display: flex; flex-direction: column; flex: 1; overflow: hidden; }
#md-input { flex: 1; width: 100%; padding: 1rem; border: none; outline: none; font-family: monospace; font-size: .875rem; line-height: 1.7; resize: none; }
.md-toolbar { padding: .5rem .75rem; display: flex; gap: .5rem; align-items: center; border-top: 1px solid #e2e8f0; background: #f8fafc; flex-shrink: 0; }
.md-preview-body { flex: 1; overflow-y: auto; padding: 1.5rem 2rem; }
.md-server-preview { max-width: 800px; margin: 2rem auto; background: #fff; border-radius: 8px; padding: 2rem 2.5rem; box-shadow: 0 1px 4px rgba(0,0,0,.1); }

/* ── markdown content ── */
.markdown-body { line-height: 1.8; }
.markdown-body h1,.markdown-body h2,.markdown-body h3,.markdown-body h4 { margin: 1.4em 0 .6em; font-weight: 700; line-height: 1.3; }
.markdown-body h1 { font-size: 1.9rem; border-bottom: 2px solid #e2e8f0; padding-bottom: .3em; }
.markdown-body h2 { font-size: 1.5rem; border-bottom: 1px solid #e2e8f0; padding-bottom: .3em; }
.markdown-body h3 { font-size: 1.2rem; }
.markdown-body p  { margin: .8em 0; }
.markdown-body a  { color: #4f46e5; }
.markdown-body ul,.markdown-body ol { margin: .8em 0 .8em 1.5rem; }
.markdown-body li { margin: .3em 0; }
.markdown-body blockquote { border-left: 4px solid #cbd5e1; padding: .4em .8em; margin: .8em 0; color: #64748b; background: #f8fafc; border-radius: 0 4px 4px 0; }
.markdown-body code { background: #f1f5f9; padding: .15em .4em; border-radius: 4px; font-family: monospace; font-size: .875em; }
.markdown-body pre { background: #1e293b; color: #e2e8f0; padding: 1rem; border-radius: 6px; overflow-x: auto; margin: .8em 0; }
.markdown-body pre code { background: none; padding: 0; color: inherit; }
.markdown-body table { border-collapse: collapse; width: 100%; margin: .8em 0; }
.markdown-body th,.markdown-body td { border: 1px solid #e2e8f0; padding: .5rem .75rem; }
.markdown-body th { background: #f8fafc; font-weight: 600; }
.markdown-body img { max-width: 100%; border-radius: 4px; }
.markdown-body hr  { border: none; border-top: 1px solid #e2e8f0; margin: 1.5em 0; }

@media (max-width: 640px) {
  .split-2,.md-split { grid-template-columns: 1fr; }
  body.md-layout { height: auto; overflow: auto; }
}