:root {
  --bg: #07111d;
  --bg-soft: #0d1c2e;
  --panel: rgba(16, 31, 50, 0.9);
  --panel-alt: #0f1d2d;
  --border: rgba(128, 163, 196, 0.24);
  --text: #eaf3ff;
  --muted: #afc3d9;
  --primary: #7bd7ff;
  --primary-strong: #4ec1ff;
  --accent: #84f0b5;
  --warning: #ffd166;
  --danger: #ff6b6b;
  --shadow: 0 18px 50px rgba(2, 6, 12, 0.42);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  background:
    radial-gradient(circle at top, rgba(33, 112, 185, 0.22), transparent 20%),
    linear-gradient(180deg, #050d18 0%, #0a1422 100%);
  color: var(--text);
  line-height: 1.6;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

p {
  margin: 0 0 1rem;
  color: var(--muted);
}

h1,
h2,
h3,
h4 {
  margin: 0 0 0.75rem;
  color: var(--text);
  line-height: 1.2;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4.2rem);
  letter-spacing: -0.06em;
}

h2 {
  font-size: clamp(1.9rem, 2vw, 3rem);
  letter-spacing: -0.04em;
}

h3 {
  font-size: 1.2rem;
}

code,
pre {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}

.container {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(16px);
  background: rgba(8, 16, 25, 0.8);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 1.8rem;
  height: 1.8rem;
  border-radius: 0.5rem;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: #062033;
  font-weight: 800;
}

nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.96rem;
}

nav a {
  color: var(--muted);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.2rem;
  border-radius: 0.8rem;
  background: linear-gradient(135deg, var(--primary-strong), var(--accent));
  color: #041721;
  font-weight: 700;
  box-shadow: var(--shadow);
}

.button:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.button-secondary {
  background: rgba(125, 162, 193, 0.12);
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: none;
}

.hero {
  padding: 5rem 0 3rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2rem;
  align-items: center;
}

.eyebrow {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 1rem;
}

.lead {
  font-size: 1.12rem;
  max-width: 60ch;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 1.5rem 0 1.2rem;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1.2rem;
  list-style: none;
  padding: 0;
  margin: 0;
  color: var(--muted);
  font-size: 0.96rem;
}

.terminal-panel,
.card,
.check-item {
  background: rgba(9, 17, 27, 0.85);
  border: 1px solid var(--border);
  border-radius: 1rem;
  box-shadow: var(--shadow);
}

.terminal-panel {
  overflow: hidden;
}

.terminal-header {
  display: flex;
  gap: 0.5rem;
  padding: 1rem 1rem 0.75rem;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.02);
}

.terminal-header span {
  width: 0.78rem;
  height: 0.78rem;
  border-radius: 50%;
  display: inline-block;
}

.terminal-header span:nth-child(1) {
  background: #ff5f57;
}
.terminal-header span:nth-child(2) {
  background: #febc2e;
}
.terminal-header span:nth-child(3) {
  background: #28c840;
}

.terminal-panel pre {
  margin: 0;
  padding: 1.25rem 1rem 1rem;
  font-size: 0.83rem;
  color: #dfeeff;
  white-space: pre-wrap;
}

.content-section {
  padding: 2rem 0 3rem;
}

.content-section.alt {
  background: rgba(9, 17, 27, 0.5);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.playground-section {
  background: rgba(9, 17, 27, 0.5);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.playground-toolbar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.playground-toolbar label,
.pane-heading {
  color: var(--text);
  font-weight: 600;
}

.playground-toolbar select {
  min-height: 2.6rem;
  padding: 0.45rem 2rem 0.45rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  background: var(--panel-alt);
  color: var(--text);
  font: inherit;
}

.diagnostic-counts {
  display: flex;
  gap: 0.55rem;
  margin-left: auto;
}

.count-pill,
.severity-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.55rem;
  border: 1px solid currentColor;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
}

.error-count,
.severity-error {
  color: #ff9a9a;
}

.warning-count,
.severity-warning {
  color: var(--warning);
}

.severity-info {
  color: var(--primary);
}

.playground-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  min-height: 26rem;
  border: 1px solid var(--border);
  border-radius: 0.65rem;
  overflow: hidden;
  background: rgba(9, 17, 27, 0.85);
}

.editor-pane,
.diagnostics-pane {
  min-width: 0;
  padding: 1rem;
}

.editor-pane {
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
}

#toml-editor {
  flex: 1;
  width: 100%;
  min-height: 21rem;
  margin-top: 0.75rem;
  padding: 0.85rem;
  resize: vertical;
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  background: #06111a;
  color: #dfeeff;
  font:
    0.88rem/1.55 'SFMono-Regular',
    Consolas,
    'Liberation Mono',
    Menlo,
    monospace;
  tab-size: 2;
}

.editor-note {
  margin: 0.55rem 0 0;
  font-size: 0.82rem;
}

.diagnostics-pane h3 {
  margin-bottom: 0.75rem;
}

.diagnostic-list {
  display: grid;
  gap: 0.65rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.diagnostic-item,
.diagnostic-clean {
  padding: 0.8rem;
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  background: rgba(255, 255, 255, 0.025);
}

.diagnostic-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 0.4rem;
  color: var(--muted);
  font-size: 0.82rem;
}

.diagnostic-rule {
  color: var(--primary);
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}

.diagnostic-message,
.diagnostic-suggestion {
  margin: 0;
  overflow-wrap: anywhere;
}

.diagnostic-suggestion {
  margin-top: 0.45rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.diagnostic-clean {
  color: var(--accent);
}

:is(#toml-editor, #playground-sample):focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.section-heading {
  margin-bottom: 1.5rem;
}

.section-heading.left {
  margin-bottom: 1rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
}

.card {
  padding: 1.25rem;
}

.comparison {
  margin-top: 1.5rem;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  color: var(--text);
}

th,
td {
  padding: 0.9rem 0.8rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  color: var(--text);
  font-weight: 600;
}

td {
  color: var(--muted);
}

.check-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.check-item {
  padding: 1.25rem;
}

.check-item.full-width {
  grid-column: 1 / -1;
}

.two-column {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1.5rem;
  align-items: start;
}

.code-block,
.mini-code {
  display: block;
  padding: 1rem 1.1rem;
  border-radius: 0.9rem;
  background: #09161f;
  border: 1px solid var(--border);
  color: #dfeeff;
  overflow-x: auto;
}

.code-block {
  margin: 0;
}

.mini-code {
  margin: 0;
  font-size: 0.85rem;
}

.feature-list {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
}

.feature-list li + li {
  margin-top: 0.5rem;
}

.footer {
  padding: 2.5rem 0;
  border-top: 1px solid var(--border);
  background: rgba(6, 11, 18, 0.9);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 0.8fr;
  gap: 1.5rem;
}

.footer-brand {
  margin-bottom: 0.8rem;
}

.footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer li + li {
  margin-top: 0.45rem;
}

@media (max-width: 820px) {
  nav {
    display: none;
  }

  .hero-grid,
  .two-column,
  .playground-grid,
  .feature-grid,
  .check-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 3.5rem;
  }

  .playground-toolbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .diagnostic-counts {
    margin-left: 0;
  }

  .editor-pane {
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }
}