:root {
  color-scheme: dark;
  --bg: #060b18;
  --panel: #101b33;
  --panel-soft: #0c1528;
  --line: #274168;
  --line-soft: #213653;
  --text: #e8eeff;
  --text-soft: #98acd0;
  --accent: #60a5fa;
  --ok: #34d399;
  --danger: #f87171;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  min-height: 100vh;
  background:
    radial-gradient(1000px 460px at 50% -10%, rgba(96, 165, 250, .22), transparent 70%),
    radial-gradient(900px 500px at 100% 100%, rgba(167, 139, 250, .13), transparent 65%),
    var(--bg);
  color: var(--text);
}

.app {
  max-width: 1100px;
  margin: 26px auto;
  padding: 22px 16px 34px;
}

.header,
header {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: linear-gradient(165deg, rgba(16, 28, 52, .95), rgba(10, 18, 35, .98));
  padding: 18px 18px 16px;
  box-shadow: 0 12px 30px rgba(0,0,0,.32);
}

.header h1,
h1 {
  margin: 0;
  font-size: clamp(1.45rem, 1.2rem + 1.2vw, 1.95rem);
  line-height: 1.15;
  letter-spacing: -.02em;
}

.header p,
header p,
p {
  margin-top: 9px;
  color: var(--text-soft);
  line-height: 1.6;
}

.toolbar {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

button {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, #22385d, #192947);
  color: var(--text);
  padding: 9px 12px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  transition: border-color .2s ease, transform .2s ease, background .2s ease;
}

button:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
  background: linear-gradient(180deg, #294470, #1c3154);
}

.grid {
  margin-top: 16px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.grid-1 {
  margin-top: 14px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.layout {
  margin-top: 14px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.controls {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.options {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 12px;
}

.field label {
  display: block;
  color: var(--text-soft);
  margin-bottom: 6px;
}

.panel {
  border: 1px solid var(--line-soft);
  border-radius: 12px;
  background: linear-gradient(170deg, var(--panel), var(--panel-soft));
  padding: 12px;
}

label {
  display: block;
  color: var(--text-soft);
  margin-bottom: 8px;
}

textarea,
input,
select {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--line-soft);
  background: #0a1324;
  color: var(--text);
  padding: 10px;
  font-size: 0.94rem;
}

.toolbar input {
  min-width: 280px;
}

textarea {
  min-height: 360px;
  resize: vertical;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

textarea.short {
  min-height: 160px;
}

textarea:focus,
input:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(96,165,250,.2);
}

.status-wrap {
  margin-top: 12px;
  border: 1px solid var(--line-soft);
  border-radius: 12px;
  padding: 10px 12px;
  background: linear-gradient(170deg, #111d36, #0c1528);
}

.status { margin: 0; font-weight: 600; color: var(--text-soft); }
.status.ok { color: var(--ok); }
.status.error { color: var(--danger); }

.note {
  margin-top: 10px;
  font-size: .9rem;
  color: var(--text-soft);
}

.back-link { margin-top: 12px; }

a,
.back-link a {
  color: #93c5fd;
  text-decoration: none;
}

a:hover,
.back-link a:hover {
  text-decoration: underline;
}

.seo-content {
  margin-top: 14px;
  padding: 14px;
  border: 1px solid var(--line-soft);
  border-radius: 12px;
  background: linear-gradient(170deg, #101b32, #0b1426);
}

.seo-content h2 { margin: 0 0 8px; font-size: 1rem; color: #c9d9fb; }
.seo-content h3 { margin: 12px 0 6px; font-size: .95rem; color: #b7caee; }
.seo-content p { margin: 6px 0; color: var(--text-soft); line-height: 1.6; }
.seo-content code { background: #1b2a44; padding: 1px 5px; border-radius: 5px; color: #93c5fd; }

.stats {
  margin-top: 12px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
}

.stats article {
  border: 1px solid var(--line-soft);
  background: linear-gradient(170deg, #101c34, #0b1528);
  border-radius: 12px;
  padding: 10px;
}

.stats h3 {
  margin: 0;
  color: #c9d9fb;
  font-size: .9rem;
}

.stats p {
  margin: 6px 0 0;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
}

.preview {
  min-height: 420px;
  border: 1px solid var(--line-soft);
  border-radius: 12px;
  background: linear-gradient(170deg, #101b32, #0b1426);
  padding: 14px;
  overflow: auto;
}

.preview h1, .preview h2, .preview h3 { margin-top: .9em; }
.preview code { background: #1b2a44; padding: 2px 6px; border-radius: 4px; }
.preview pre { background: #0f172a; padding: 10px; border-radius: 8px; overflow: auto; }
.preview a { color: #93c5fd; }
.preview blockquote { border-left: 3px solid #475569; padding-left: 10px; color: #cbd5e1; }

@media (max-width: 900px) {
  .grid, .layout { grid-template-columns: 1fr; }
  textarea { min-height: 240px; }
  .preview { min-height: 320px; }
}

@media (max-width: 640px) {
  .app { margin: 16px auto; padding: 14px 12px 26px; }
  .header, header { padding: 14px; }
  .toolbar > button { flex: 1 1 100%; }
}