/* kagamiX — desktop app shell: fixed side nav + split work/preview panes.
   One accent variable, tinted dark mode. Desktop-only (1280×720+), no media queries. */
:root {
  --accent: light-dark(#475569, #94a3b8);
  --bg: light-dark(#ffffff, #0c0c0f);
  --surface: light-dark(#ffffff, #141418);
  --elevated: light-dark(#fafafa, #1b1b21);
  --ink: light-dark(#333333, #ededf0);
  --muted: light-dark(#6b7280, #9ca3af);
  --line: light-dark(#e7e7ea, #2a2a31);
  color-scheme: light dark;
}
[data-accent="nihongo"] { --accent: #ff4081; --bg: light-dark(#ffffff, #130410); }
[data-accent="vn"] { --accent: #e84a4a; --bg: light-dark(#ffffff, #130404); }
[data-accent="blog"] { --accent: light-dark(#4f46e5, #818cf8); --bg: light-dark(#ffffff, #0a0a18); }

/* Manual theme override; no data-theme = follow system */
:root[data-theme="light"] { color-scheme: light; }
:root[data-theme="dark"] { color-scheme: dark; }

* { box-sizing: border-box; margin: 0; }

html, body { height: 100%; }
body {
  font-family: "Noto Sans", "Noto Sans Thai Looped", "Noto Sans JP", system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
  display: grid;
  grid-template-columns: 232px minmax(0, 1fr);
  overflow: hidden;
}

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* Side nav */
.side-nav {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  padding: 1.1rem 0.9rem;
  background: var(--surface);
  border-right: 1px solid var(--line);
  overflow-y: auto;
}
.brand {
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: none;
  padding: 0.2rem 0.6rem;
}
.brand span { color: var(--accent); }
.nav-group { display: grid; gap: 2px; }
.nav-group .group-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--muted);
  padding: 0 0.6rem 0.3rem;
}
.nav-group a {
  display: block;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.35rem 0.6rem;
  border-radius: 8px;
}
.nav-group a:hover { color: var(--ink); background: var(--elevated); }
.nav-group a.active {
  color: var(--accent);
  font-weight: 700;
  background: color-mix(in srgb, var(--accent) 10%, transparent);
}
.nav-foot { margin-top: auto; display: grid; gap: 0.6rem; padding: 0 0.6rem; }
.nav-foot .theme-btn { width: 100%; text-align: center; }

/* Workspace (second body column) */
.workspace { height: 100%; min-width: 0; overflow-y: auto; }
.workspace.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 420px;
  overflow: hidden;
}
.workspace.editor-split {
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr);
  overflow: hidden;
}
/* Tools on the right: editor takes the wide left column, snippet rail moves right. */
.workspace.editor-split.tools-right { grid-template-columns: minmax(0, 1fr) 340px; }
.tools-right .pane-editor { order: -1; }
.tools-right .pane-snippets { border-right: 0; border-left: 1px solid var(--line); }
.pane { min-width: 0; overflow-y: auto; }

/* Form pane: flat sections divided by hairlines */
.pane-form { padding-bottom: 4rem; }
.pane-form .card { padding: 1.4rem 2rem 1.6rem; border-bottom: 1px solid var(--line); }
.card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}
.card-head h2 { font-size: 0.95rem; font-weight: 800; letter-spacing: -0.01em; }
.stack > * + * { margin-top: 1rem; }

/* Snippet rail (VN editor) */
.pane-snippets { background: var(--surface); border-right: 1px solid var(--line); }
.pane-snippets .card { padding: 1.25rem 1.25rem 1.5rem; border-bottom: 1px solid var(--line); }

/* Preview / editor panes: pinned head + foot, scrolling middle */
.pane-preview, .pane-editor {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.pane-preview { background: var(--surface); border-left: 1px solid var(--line); }
.pane-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--line);
}
.pane-head h2 { font-size: 0.95rem; font-weight: 800; letter-spacing: -0.01em; }
.pane-foot {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  padding: 0.85rem 1.25rem;
  border-top: 1px solid var(--line);
}
#preview {
  font: inherit;
  white-space: pre-wrap;
  word-break: break-word;
  flex: 1;
  overflow-y: auto;
  padding: 1.25rem;
}
.pane-editor textarea.bare {
  flex: 1;
  border: 0;
  border-radius: 0;
  background: transparent;
  resize: none;
  padding: 1.5rem 2rem;
  font-size: 1.05rem;
}
.char-count { color: var(--muted); font-size: 0.875rem; }

/* Forms */
.field label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--muted);
  margin-bottom: 0.25rem;
}
input[type="text"], input[type="date"], select, textarea {
  width: 100%;
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--elevated);
  color: var(--ink);
  font: inherit;
}
input[type="text"]:focus, input[type="date"]:focus, select:focus, textarea:focus {
  border-color: var(--accent);
  background: var(--surface);
  outline: none;
}
input:disabled, select:disabled { opacity: 0.45; }
::placeholder { color: var(--muted); opacity: 1; }
textarea { resize: vertical; display: block; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.75rem; }
.grid-2-1 { display: grid; grid-template-columns: 2fr 1fr; gap: 0.75rem; }
.row { display: flex; gap: 0.75rem; align-items: stretch; }
.row select { flex: 1; min-width: 0; }
.row .btn { flex: none; }

.checks { border: 0; padding: 0; display: grid; gap: 0.2rem; }
.checks label, .check {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
}
.checks.cols-3 { grid-template-columns: repeat(3, 1fr); }
.props-row { display: flex; gap: 0.75rem; align-items: flex-end; flex-wrap: wrap; }
.props-row .field { flex: 1; min-width: 110px; }
.props-row .check { padding-bottom: 0.6rem; white-space: nowrap; }
input[type="checkbox"], input[type="radio"] { accent-color: var(--accent); }

/* Buttons */
.btn, .btn-outline, .btn-quiet, .btn-danger {
  font: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 8px;
  cursor: pointer;
  text-align: left;
}
.btn { background: var(--accent); color: #fff; border: 1px solid var(--accent); text-align: center; }
.btn:hover { opacity: 0.85; }
.btn-outline { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.btn-outline:hover { background: color-mix(in srgb, var(--accent) 10%, transparent); }
.btn-quiet { background: transparent; color: var(--muted); border: 1px solid var(--line); text-decoration: none; }
.btn-quiet:hover { color: var(--ink); background: var(--elevated); }
.btn-danger { background: transparent; color: #dc2626; border: 1px solid #dc2626; text-align: center; }
.btn-danger:hover { background: color-mix(in srgb, #dc2626 10%, transparent); }
button:disabled { opacity: 0.6; cursor: default; }

.snippet-list { display: grid; gap: 0.5rem; }

/* Home */
.home-pane { padding: 3.5rem 4rem; }
.home-pane h1 { font-weight: 800; letter-spacing: -0.02em; font-size: 2rem; line-height: 1.15; margin-bottom: 2.5rem; }
.home-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 320px)); gap: 2.5rem; }
.home-grid h2 { font-size: 1rem; font-weight: 800; letter-spacing: -0.02em; margin-bottom: 0.75rem; }
.home-grid .links { display: grid; gap: 0.5rem; }
.home-grid .vn h2 { color: #e84a4a; }
.home-grid .nihongo h2 { color: #ff4081; }
.home-grid .blog h2 { color: light-dark(#4f46e5, #818cf8); }

/* Doc pane: plain scrolling article of cards (guides, reference) */
.doc-pane { padding: 3.5rem 4rem 5rem; max-width: 840px; }
.doc-pane h1 { font-weight: 800; letter-spacing: -0.02em; font-size: 2rem; line-height: 1.15; }
.doc-pane .sub { color: var(--muted); margin-bottom: 2.5rem; }
.doc-pane .card { border: 1px solid var(--line); border-radius: 10px; padding: 1.4rem 1.6rem; margin-bottom: 1.5rem; }
.doc-pane .card-head { margin-bottom: 0.9rem; }
.doc-pane p { margin-bottom: 0.75rem; }
.doc-pane p:last-child { margin-bottom: 0; }
.doc-pane ul { padding-left: 1.25rem; }
.doc-pane ul li + li { margin-top: 0.4rem; }
.doc-pane .step-label { color: var(--muted); font-size: 0.8rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; margin: 1rem 0 0.4rem; }
.doc-pane .step-label:first-child { margin-top: 0; }
.code-block + .code-block, .code-block + p, p + .code-block { margin-top: 0.75rem; }
.code-block pre {
  background: var(--elevated);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  overflow-x: auto;
  font-size: 0.85rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  white-space: pre;
}
.doc-table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
.doc-table th, .doc-table td { text-align: left; padding: 0.5rem 0.6rem; border-bottom: 1px solid var(--line); }
.doc-table th { color: var(--muted); font-weight: 600; }
.doc-table td:first-child, .doc-table th:first-child { padding-left: 0; }