:root {
  color-scheme: dark;
  --bg: #06101d;
  --panel: rgba(15, 23, 42, 0.82);
  --panel-strong: rgba(15, 23, 42, 0.95);
  --line: rgba(148, 163, 184, 0.18);
  --text: #edf5ff;
  --muted: #94a9c3;
  --heading: #ffffff;
  --primary: #2dd4bf;
  --primary-strong: #38bdf8;
  --success: #34d399;
  --danger: #fb7185;
  --editor: #07111f;
  --shadow: 0 24px 72px rgba(0, 0, 0, 0.32);
}

html[data-theme="light"] {
  color-scheme: light;
  --bg: #f5f8fc;
  --panel: rgba(255, 255, 255, 0.92);
  --panel-strong: #ffffff;
  --line: rgba(15, 23, 42, 0.1);
  --text: #162033;
  --muted: #64748b;
  --heading: #07111f;
  --primary: #0f766e;
  --primary-strong: #0284c7;
  --success: #047857;
  --danger: #be123c;
  --editor: #ffffff;
  --shadow: 0 20px 50px rgba(15, 23, 42, 0.1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 12% 10%, rgba(45, 212, 191, 0.16), transparent 28rem),
    radial-gradient(circle at 88% 6%, rgba(56, 189, 248, 0.16), transparent 24rem),
    linear-gradient(180deg, rgba(15, 23, 42, 0.22), transparent 45%),
    var(--bg);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(to bottom, black, transparent 72%);
}

button, textarea, select { font: inherit; }
textarea, code, pre { font-family: "JetBrains Mono", Consolas, "Courier New", monospace; }
a { color: inherit; text-decoration: none; }
p, h1, h2, h3 { margin-top: 0; }

.page-shell {
  position: relative;
  width: min(1320px, calc(100% - 28px));
  margin: 0 auto;
  padding: 14px 0 32px;
}

main { display: grid; gap: 16px; }

.card {
  border: 1px solid var(--line);
  border-radius: 24px;
  background: linear-gradient(180deg, var(--panel-strong), var(--panel));
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.nav, .nav-links, .hero-row, .toolbar, .toolbar-actions, .editor-head, .status-bar, .advanced-bar, .advanced-options, .note-panel {
  display: flex;
  align-items: center;
}

.nav {
  justify-content: space-between;
  gap: 16px;
  padding: 8px 0 14px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 15px;
  color: #04111f;
  background: linear-gradient(135deg, #2dd4bf, #38bdf8);
  font-size: 0.68rem;
  font-weight: 900;
  letter-spacing: 0.04em;
}

.brand small {
  display: block;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 700;
}

.nav-links {
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-links a, .theme-toggle, .btn, .advanced-toggle {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  cursor: pointer;
  font-weight: 800;
}

.nav-links a, .theme-toggle {
  padding: 9px 13px;
  font-size: 0.84rem;
}

.hero { padding-bottom: 6px; }
.hero-row {
  justify-content: space-between;
  gap: 16px;
  padding: 8px 0 10px;
}

.eyebrow, .section-kicker {
  margin-bottom: 8px;
  color: var(--primary);
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.72rem;
}

h1 {
  margin-bottom: 8px;
  color: var(--heading);
  font-size: clamp(1.18rem, 2.2vw, 1.66rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.hero-subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.workspace, .seo-panel {
  margin-top: 16px;
  overflow: hidden;
}

.toolbar {
  justify-content: space-between;
  gap: 16px;
  padding: 16px;
  border-bottom: 1px solid var(--line);
}

.toolbar h2 {
  margin-bottom: 0;
  font-size: 1.02rem;
}

.toolbar-actions {
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 14px;
}

.btn-small {
  min-height: 34px;
  padding: 0 12px;
  font-size: 0.82rem;
}

.btn-primary {
  border: 0;
  color: #04111f;
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
}

.btn-secondary:hover, .theme-toggle:hover, .nav-links a:hover, .advanced-toggle:hover {
  border-color: rgba(56, 189, 248, 0.38);
}

.status-bar, .advanced-bar, .advanced-options, .note-panel {
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 900;
  border: 1px solid var(--line);
}

.status-pill.idle { color: var(--muted); }
.status-pill.success {
  color: var(--success);
  border-color: color-mix(in srgb, var(--success) 45%, transparent);
  background: color-mix(in srgb, var(--success) 14%, transparent);
}
.status-pill.error {
  color: var(--danger);
  border-color: color-mix(in srgb, var(--danger) 45%, transparent);
  background: color-mix(in srgb, var(--danger) 12%, transparent);
}

.status-message {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.advanced-options {
  justify-content: flex-start;
  flex-wrap: wrap;
}

.advanced-options label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.advanced-options select {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: color-mix(in srgb, var(--panel-strong) 72%, transparent);
  color: var(--text);
  padding: 6px 10px;
}

.advanced-options input { accent-color: var(--primary); }

.editor-grid, .content-columns, .seo-grid {
  display: grid;
  gap: 16px;
}

.editor-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  padding: 16px;
}

.editor-panel {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: color-mix(in srgb, var(--panel-strong) 72%, transparent);
  overflow: hidden;
}

.editor-head {
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
}

.editor-head h3 {
  margin-bottom: 4px;
  font-size: 0.94rem;
}

.editor-head p {
  margin: 0;
  color: var(--muted);
  font-size: 0.76rem;
}

textarea {
  width: 100%;
  min-height: 430px;
  resize: vertical;
  border: 0;
  outline: 0;
  padding: 16px;
  color: var(--text);
  background: var(--editor);
  font-size: 0.84rem;
  line-height: 1.68;
}

textarea::placeholder {
  color: color-mix(in srgb, var(--muted) 88%, transparent);
}

.note-panel {
  color: var(--muted);
  font-size: 0.84rem;
}

.note-panel strong { color: var(--heading); }

.seo-panel { padding: 22px; }

.seo-intro p, .content-columns p, .seo-grid p, .faq-list p {
  color: var(--muted);
  font-size: 0.93rem;
  line-height: 1.72;
}

.seo-panel h2 {
  margin-bottom: 10px;
  font-size: clamp(1.12rem, 2vw, 1.46rem);
  letter-spacing: -0.03em;
}

.seo-panel h3 {
  margin-bottom: 8px;
  font-size: 0.98rem;
}

.content-columns {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 18px;
}

.seo-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 18px;
}

.faq-list {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.faq-list details {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: color-mix(in srgb, var(--panel-strong) 70%, transparent);
  padding: 14px 16px;
}

.faq-list summary {
  cursor: pointer;
  color: var(--heading);
  font-weight: 800;
  list-style: none;
}

.faq-list summary::-webkit-details-marker { display: none; }

.toast-stack {
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 20;
  display: grid;
  gap: 10px;
}

.toast {
  min-width: 220px;
  max-width: min(360px, calc(100vw - 32px));
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel-strong) 88%, transparent);
  box-shadow: var(--shadow);
  font-size: 0.84rem;
  font-weight: 700;
}

.toast.success { color: var(--success); }
.toast.error { color: var(--danger); }

@media (max-width: 980px) {
  .editor-grid, .content-columns, .seo-grid { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .nav, .hero-row, .toolbar, .status-bar, .advanced-bar, .note-panel {
    align-items: flex-start;
    flex-direction: column;
  }
  .nav-links, .toolbar-actions { justify-content: flex-start; }
  textarea { min-height: 320px; }
}