:root {
  --bg: #F1F5F9;
  --card: #FFFFFF;
  --border: #E2E8F0;
  --border-strong: #CBD5E1;
  --text: #0F172A;
  --text-dim: #64748B;
  --text-faint: #94A3B8;
  --blue: #3B82F6;
  --blue-hover: #2563EB;
  --blue-soft: #EFF6FF;
  --danger: #EF4444;
  --success: #16A34A;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(15,23,42,0.04), 0 12px 32px rgba(15,23,42,0.08);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

* { box-sizing: border-box; }

html, body { height: 100%; margin: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------------- Layout ---------------- */

.page-shell {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 20px;
}

.card {
  width: 100%;
  max-width: 1040px;
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 40px 44px;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
}

.logo {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.logo .logo-html { color: var(--text); }
.logo .logo-publisher { color: var(--blue); }

.card-nav {
  display: flex;
  align-items: center;
  gap: 16px;
}
.card-nav a {
  font-size: 14px;
  color: var(--text-dim);
}
.card-nav a:hover { color: var(--text); text-decoration: none; }

.btn-small {
  padding: 6px 12px;
  font-size: 12.5px;
  font-weight: 500;
}

/* ---------------- Двухколоночная раскладка: редактор + примеры ---------------- */

.layout {
  display: grid;
  grid-template-columns: 1fr 200px;
  gap: 28px;
  align-items: start;
}

.main-col { min-width: 0; }

.examples-col {
  border-left: 1px solid var(--border);
  padding-left: 24px;
}

.examples-head {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-dim);
  margin-bottom: 10px;
}

.examples-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.example-btn {
  appearance: none;
  width: 100%;
  text-align: left;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 9px 12px;
  font: inherit;
  font-size: 13px;
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}
.example-btn:hover { border-color: var(--blue); color: var(--blue); background: var(--blue-soft); }
.example-btn:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }

@media (max-width: 780px) {
  .layout { grid-template-columns: 1fr; }
  .examples-col {
    border-left: none;
    border-top: 1px solid var(--border);
    padding-left: 0;
    padding-top: 20px;
  }
  .examples-list { flex-direction: row; flex-wrap: wrap; }
  .example-btn { width: auto; }
}

/* ---------------- Editor ---------------- */

.field-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.field-label .size-counter {
  float: right;
  font-weight: 400;
  color: var(--text-faint);
  font-variant-numeric: tabular-nums;
}
.field-label .size-counter.over-limit { color: var(--danger); }

.editor-shell {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: #FAFBFC;
}

.CodeMirror {
  height: 340px !important;
  font-family: var(--mono);
  font-size: 13.5px;
  background: #FAFBFC !important;
  color: #1E293B !important;
  padding: 4px 0;
}
.CodeMirror-gutters { background: #F8FAFC !important; border-right: 1px solid var(--border) !important; }
.CodeMirror-cursor { border-left: 1.5px solid var(--blue) !important; }
.CodeMirror-selected { background: var(--blue-soft) !important; }
.CodeMirror-focused { outline: none; }
.editor-shell:focus-within { border-color: var(--blue); box-shadow: 0 0 0 3px var(--blue-soft); }

/* ---------------- Actions ---------------- */

.actions-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 18px;
  flex-wrap: wrap;
}

.btn {
  appearance: none;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s, transform 0.05s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid transparent;
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
}
.btn-primary:hover { background: var(--blue-hover); border-color: var(--blue-hover); }
.btn-primary:disabled { background: var(--text-faint); border-color: var(--text-faint); cursor: not-allowed; }

.btn-outline {
  background: transparent;
  color: var(--text);
  border-color: var(--border-strong);
}
.btn-outline:hover { border-color: var(--blue); color: var(--blue); }

.btn:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

.status-msg {
  font-size: 13.5px;
  color: var(--text-dim);
  margin-left: 4px;
}
.status-success { color: var(--success); }
.status-error { color: var(--danger); }

/* ---------------- Preview ---------------- */

.preview-shell {
  margin-top: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.preview-shell.hidden { display: none; }

.preview-shell-head {
  padding: 8px 14px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-dim);
  background: #F8FAFC;
  border-bottom: 1px solid var(--border);
}

.preview-frame {
  width: 100%;
  height: 320px;
  border: none;
  background: #fff;
  display: block;
}

/* ---------------- Result ---------------- */

.result-box {
  margin-top: 20px;
  padding: 16px 18px;
  border-radius: var(--radius-sm);
  background: var(--blue-soft);
  border: 1px solid #BFDBFE;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.result-box.hidden { display: none; }

.result-url {
  flex: 1;
  min-width: 220px;
  background: #fff;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 9px 12px;
  font-family: var(--mono);
  font-size: 13px;
}
.result-url:focus-visible { outline: 2px solid var(--blue); outline-offset: 1px; }

/* ---------------- Служебные страницы ---------------- */

.doc {
  max-width: 640px;
  margin: 0 auto;
}
.doc h1 {
  font-size: 24px;
  font-weight: 700;
  margin: 0 0 4px;
}
.doc .subtitle { color: var(--text-dim); margin-bottom: 26px; font-size: 14.5px; }
.doc h2 { font-size: 15px; font-weight: 600; margin-top: 26px; color: var(--text); }
.doc p, .doc li { color: #334155; line-height: 1.65; font-size: 15px; }
.doc ul { padding-left: 20px; }
.doc code {
  font-family: var(--mono);
  background: #F1F5F9;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 13px;
}
.back-link { display: inline-block; margin-top: 32px; font-size: 14px; }

.notfound { text-align: center; padding: 20px 0; }
.notfound .code { font-size: 56px; font-weight: 700; color: var(--text); line-height: 1; }
.notfound p { color: var(--text-dim); margin: 14px 0 26px; font-size: 15px; }

@media (max-width: 640px) {
  .card { padding: 28px 22px; }
  .CodeMirror { height: 260px !important; }
}