/* ============================================================
   SQLMASTERS · ATLAS NOIR · v1
   Site estático: HTML + CSS + JS + curso-sql.json
   ============================================================ */

:root {
  color-scheme: dark;

  --color-noir-950: #050506;
  --color-noir-925: #08080a;
  --color-noir-900: #0b0b0d;
  --color-noir-850: #121216;
  --color-noir-800: #1b1b21;
  --color-ivory-50: #f6f1e8;
  --color-ivory-100: #ece4d6;
  --color-stone-300: #b8b3a8;
  --color-stone-500: #77736a;
  --color-white: #ffffff;
  --color-black: #000000;
  --color-automation-500: #4c7dff;
  --color-gold-500: #c9a86a;
  --color-crimson-500: #c94f4f;
  --color-violet-500: #8b5cf6;

  --background: var(--color-noir-950);
  --surface: var(--color-noir-850);
  --surface-2: var(--color-noir-800);
  --surface-soft: rgba(246, 241, 232, 0.045);
  --text-primary: var(--color-ivory-50);
  --text-secondary: var(--color-stone-300);
  --text-muted: var(--color-stone-500);
  --border: rgba(246, 241, 232, 0.12);
  --border-strong: rgba(246, 241, 232, 0.24);
  --accent: var(--color-gold-500);
  --accent-technical: var(--color-automation-500);

  --font-ui: "Manrope", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-editorial: "Instrument Serif", Georgia, serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
  --font-dense: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --container: min(1440px, calc(100% - 96px));
}

html[data-theme="light"] {
  color-scheme: light;
  --background: #ffffff;
  --surface: #ffffff;
  --surface-2: #fbfbfb;
  --surface-soft: rgba(0, 0, 0, 0.02);
  --text-primary: #050506;
  --text-secondary: rgba(5, 5, 6, 0.74);
  --text-muted: rgba(5, 5, 6, 0.50);
  --border: rgba(5, 5, 6, 0.10);
  --border-strong: rgba(5, 5, 6, 0.18);
  --accent: var(--color-automation-500);
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  text-rendering: geometricPrecision;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(rgba(246, 241, 232, 0.032) 1px, transparent 1px),
    linear-gradient(90deg, rgba(246, 241, 232, 0.032) 1px, transparent 1px),
    radial-gradient(circle at 82% 12%, rgba(76, 125, 255, 0.18), transparent 28%),
    radial-gradient(circle at 12% 72%, rgba(201, 168, 106, 0.11), transparent 30%),
    var(--background);
  background-size: 64px 64px, 64px 64px, auto, auto, auto;
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
}

html[data-theme="light"] body {
  background: var(--background);
}

a { color: inherit; text-decoration: none; }
button, input, select { font: inherit; }
p, h1, h2, h3, h4 { margin-top: 0; }
p { color: var(--text-secondary); }

::selection {
  background: rgba(76, 125, 255, 0.36);
  color: var(--color-white);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 2px solid var(--accent-technical);
  outline-offset: 4px;
}

.container {
  width: var(--container);
  margin: 0 auto;
}

.skip-link {
  position: fixed;
  left: 16px;
  top: 16px;
  z-index: 999;
  transform: translateY(-160%);
  border-radius: 999px;
  background: var(--color-ivory-50);
  color: var(--color-noir-950);
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  transition: transform 180ms var(--ease);
}

.skip-link:focus { transform: translateY(0); }

.progress-bar {
  position: fixed;
  inset: 0 auto auto 0;
  z-index: 100;
  width: 100%;
  height: 2px;
  background: transparent;
}

.progress-bar span {
  display: block;
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--accent-technical), var(--accent));
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  border-bottom: 1px solid var(--border);
  background: rgba(5, 5, 6, 0.78);
  backdrop-filter: blur(20px);
}

html[data-theme="light"] .site-header {
  background: rgba(255, 255, 255, 0.92);
}

.nav {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-6);
  min-height: 78px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  min-width: max-content;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.brand-mark {
  display: grid;
  place-items: center;
  min-width: 42px;
  height: 42px;
  border: 1px solid rgba(76, 125, 255, 0.40);
  border-radius: 999px;
  background: rgba(76, 125, 255, 0.10);
  color: var(--accent-technical);
  letter-spacing: 0.04em;
}

.nav-links {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.nav-links a {
  position: relative;
  padding: 10px 11px;
  transition: color 180ms var(--ease);
  white-space: nowrap;
}

.nav-links a::after {
  content: "";
  position: absolute;
  right: 11px;
  bottom: 7px;
  left: 11px;
  height: 1px;
  background: var(--accent-technical);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms var(--ease);
}

.nav-links a:hover,
.nav-links a.is-active { color: var(--text-primary); }

.nav-links a:hover::after,
.nav-links a.is-active::after { transform: scaleX(1); }

.nav-actions {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.theme-toggle,
.menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  height: 42px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(246, 241, 232, 0.04);
  color: var(--text-secondary);
  cursor: pointer;
  transition: transform 180ms var(--ease), border-color 180ms var(--ease), color 180ms var(--ease);
}

.theme-toggle:hover,
.menu-toggle:hover {
  transform: translateY(-1px);
  border-color: var(--border-strong);
  color: var(--text-primary);
}

.menu-toggle { display: none; }

main {
  min-height: 70vh;
  padding-bottom: var(--space-16);
}

section {
  position: relative;
  border-top: 1px solid var(--border);
  padding: var(--space-24) 0;
}

section:first-child { border-top: 0; }

.eyebrow,
.coordinate,
.meta,
.badge,
.tag,
.button,
.lesson-number,
.footer,
.site-footer,
.input-label {
  font-family: var(--font-mono);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
  color: var(--accent-technical);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 42px;
  height: 1px;
  background: currentColor;
}

h1 {
  max-width: 1120px;
  margin-bottom: var(--space-8);
  font-size: clamp(3.2rem, 8vw, 8.1rem);
  font-weight: 800;
  letter-spacing: -0.064em;
  line-height: 0.90;
}

h2 {
  margin-bottom: var(--space-6);
  font-size: clamp(2rem, 4vw, 4.2rem);
  font-weight: 800;
  letter-spacing: -0.052em;
  line-height: 1.02;
}

h3 {
  margin-bottom: var(--space-3);
  font-size: 1.18rem;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

h1 em,
h2 em {
  color: var(--accent);
  font-family: var(--font-editorial);
  font-style: italic;
  font-weight: 400;
  letter-spacing: -0.035em;
}

.lead {
  max-width: 900px;
  margin-bottom: var(--space-8);
  color: var(--color-ivory-100);
  font-size: clamp(1.10rem, 2vw, 1.48rem);
  line-height: 1.5;
}

html[data-theme="light"] .lead { color: var(--text-secondary); }

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(320px, 4fr);
  gap: var(--space-12);
  align-items: center;
  min-height: calc(100vh - 78px);
  padding-top: var(--space-16);
  
}

.hero-grid:focus,
.container,
.hero-grid:focus-visible {
  outline: none;
}

.hero-panel,
.card,
.content-shell,
.sidebar,
.lesson-card,
.notice {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(180deg, rgba(246, 241, 232, 0.045), transparent 45%),
    rgba(18, 18, 22, 0.76);
}

html[data-theme="light"] .hero-panel,
html[data-theme="light"] .card,
html[data-theme="light"] .content-shell,
html[data-theme="light"] .sidebar,
html[data-theme="light"] .lesson-card,
html[data-theme="light"] .notice {
  background: #ffffff;
}

.hero-panel {
  padding: var(--space-6);
  min-height: 520px;
  overflow: hidden;
}

.panel-line {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  border-bottom: 1px solid var(--border);
  padding-bottom: var(--space-4);
  margin-bottom: var(--space-6);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.70rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.kpi-grid {
  display: grid;
  gap: var(--space-3);
}

.kpi {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  background: rgba(5, 5, 6, 0.24);
}

html[data-theme="light"] .kpi { background: #ffffff; }

.kpi strong {
  display: block;
  color: var(--text-primary);
  font-size: clamp(2.2rem, 4vw, 4.4rem);
  font-weight: 800;
  letter-spacing: -0.06em;
  line-height: 1;
}

.kpi span {
  display: block;
  margin-top: var(--space-2);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-8);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 50px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  padding: 0 20px;
  background: rgba(246, 241, 232, 0.03);
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.045em;
  text-transform: uppercase;
  cursor: pointer;
  transition: transform 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease), color 180ms var(--ease);
}

.button:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  color: var(--text-primary);
}

.button.primary {
  border-color: var(--color-ivory-50);
  background: var(--color-ivory-50);
  color: var(--color-noir-950);
}

html[data-theme="light"] .button.primary {
  border-color: var(--color-automation-500);
  background: var(--color-automation-500);
  color: #ffffff;
}

.button.technical {
  border-color: rgba(76, 125, 255, 0.44);
  border-radius: 10px;
  background: rgba(76, 125, 255, 0.10);
  color: var(--accent-technical);
}

.grid-2,
.grid-3 {
  display: grid;
  gap: var(--space-6);
}

.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.card {
  min-height: 250px;
  padding: var(--space-6);
}

.card.compact { min-height: auto; }

.card:hover,
.lesson-card:hover {
  border-color: var(--border-strong);
}

.badges,
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-5);
}

.badge,
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 10px;
  color: var(--text-secondary);
  font-size: 0.70rem;
  letter-spacing: 0.045em;
  text-transform: uppercase;
  white-space: nowrap;
}

.badge.blue,
.tag.blue {
  border-color: rgba(76, 125, 255, 0.35);
  background: rgba(76, 125, 255, 0.08);
  color: var(--accent-technical);
}

.badge.gold,
.tag.gold {
  border-color: rgba(201, 168, 106, 0.32);
  background: rgba(201, 168, 106, 0.08);
  color: var(--accent);
}

.toolbar {
  display: grid;
  grid-template-columns: minmax(250px, 1fr) 240px;
  gap: var(--space-3);
  margin: var(--space-8) 0;
}

.input,
.select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: rgba(5, 5, 6, 0.28);
  color: var(--text-primary);
  padding: 13px 14px;
}

html[data-theme="light"] .input,
html[data-theme="light"] .select {
  background: #ffffff;
}

.input::placeholder { color: var(--text-muted); }

.lesson-list {
  display: grid;
  gap: var(--space-4);
}

.lesson-card {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr) auto;
  gap: var(--space-6);
  align-items: start;
  padding: var(--space-5);
  transition: border-color 180ms var(--ease), transform 180ms var(--ease);
}

.lesson-card:hover { transform: translateY(-1px); }

.lesson-number {
  color: var(--accent-technical);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lesson-card h3 { margin-bottom: 4px; }

.lesson-card p {
  margin-bottom: 0;
  font-size: 0.94rem;
}

.lesson-actions {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  justify-content: flex-end;
}

.lesson-actions a {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 10px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.lesson-actions a:hover {
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.study-layout {
  display: grid;
  grid-template-columns: minmax(0, 8fr) minmax(280px, 3fr);
  gap: var(--space-6);
  align-items: start;
  padding-top: var(--space-16);
}

.content-shell {
  padding: var(--space-8);
  overflow: hidden;
}

.sidebar {
  position: sticky;
  top: 100px;
  padding: var(--space-5);
}

.sidebar h3 {
  font-size: 1rem;
}

.sidebar-nav {
  display: grid;
  gap: var(--space-2);
}

.sidebar-nav a,
.sidebar-nav button {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  padding: 10px 12px;
  text-align: left;
  cursor: pointer;
}

.sidebar-nav a:hover,
.sidebar-nav button:hover {
  border-color: var(--border-strong);
  color: var(--text-primary);
}

.content-title {
  margin-bottom: var(--space-4);
  font-size: clamp(2.3rem, 5vw, 5.2rem);
}

.markdown {
  color: var(--text-secondary);
}

.markdown > *:first-child { margin-top: 0; }

.markdown h1,
.markdown h2,
.markdown h3,
.markdown h4 {
  color: var(--text-primary);
  margin-top: var(--space-8);
}

.markdown h2 {
  padding-top: var(--space-4);
  border-top: 1px solid var(--border);
  font-size: clamp(1.5rem, 2.4vw, 2.2rem);
  line-height: 1.15;
}

.markdown h3 {
  font-size: 1.25rem;
}

.markdown a {
  color: var(--accent-technical);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.markdown ul,
.markdown ol {
  padding-left: 1.3rem;
  color: var(--text-secondary);
}

.markdown li { margin: 6px 0; }

.markdown blockquote {
  margin: var(--space-6) 0;
  border-left: 3px solid var(--accent-technical);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: var(--space-4) var(--space-5);
  background: rgba(76, 125, 255, 0.08);
  color: var(--text-primary);
}

.markdown table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-6) 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 0.94rem;
}

.markdown th,
.markdown td {
  border: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
}

.markdown th {
  color: var(--text-primary);
  background: rgba(76, 125, 255, 0.08);
}

pre {
  position: relative;
  overflow-x: auto;
  border: 1px solid rgba(76, 125, 255, 0.26);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  background: #07080c;
  color: var(--color-ivory-50);
  line-height: 1.55;
}

html[data-theme="light"] pre {
  background: #050506;
}

code {
  font-family: var(--font-mono);
  font-size: 0.92em;
}

:not(pre) > code {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.1em 0.35em;
  background: rgba(76, 125, 255, 0.08);
  color: var(--accent-technical);
}

pre code {
  white-space: pre;
}

.copy-code {
  position: absolute;
  top: 10px;
  right: 10px;
  border: 1px solid rgba(246, 241, 232, 0.16);
  border-radius: 999px;
  background: rgba(246, 241, 232, 0.08);
  color: var(--color-ivory-50);
  padding: 5px 8px;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
}

.notice {
  padding: var(--space-5);
  margin: var(--space-6) 0;
}

.notice strong {
  display: block;
  margin-bottom: var(--space-2);
  color: var(--text-primary);
}

.nav-prev-next {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  margin-top: var(--space-8);
}

.nav-prev-next a {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  color: var(--text-secondary);
}

.nav-prev-next a:hover {
  border-color: var(--border-strong);
  color: var(--text-primary);
}

.loading {
  min-height: 60vh;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: var(--space-6);
  border-top: 1px solid var(--border);
  padding: var(--space-6) 0 var(--space-12);
  color: var(--text-muted);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

@media (max-width: 1180px) {
  :root { --container: min(100% - 56px, 980px); }

  .hero-grid,
  .grid-2,
  .grid-3,
  .study-layout {
    grid-template-columns: 1fr;
  }

  .hero-grid { min-height: auto; }
  .sidebar { position: static; }
}

@media (max-width: 900px) {
  .nav {
    grid-template-columns: auto auto;
    justify-content: space-between;
  }

  .brand-text { display: none; }

  .nav-links {
    position: fixed;
    top: 78px;
    right: 20px;
    left: 20px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-3);
    background: rgba(5, 5, 6, 0.94);
    backdrop-filter: blur(18px);
  }

  html[data-theme="light"] .nav-links { background: rgba(255, 255, 255, 0.98); }

  .nav-links.is-open { display: flex; }
  .nav-links a { padding: 14px 12px; }

  .menu-toggle { display: inline-flex; }

  .toolbar,
  .lesson-card,
  .nav-prev-next {
    grid-template-columns: 1fr;
  }

  .lesson-actions {
    justify-content: flex-start;
  }

  .content-shell {
    padding: var(--space-5);
  }

  .site-footer {
    flex-direction: column;
  }
}

@media (max-width: 560px) {
  :root { --container: min(100% - 28px, 520px); }

  section { padding: var(--space-16) 0; }
  h1 { font-size: clamp(2.75rem, 16vw, 4.75rem); }
  .lead { font-size: 1.05rem; }
}

/* ============================================================
   v1.1 · Playground seguro e setup SQL dos exercícios
   ============================================================ */
.playground-links {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.playground-links.compact-links {
  margin: var(--space-5) 0;
}

.playground-link {
  display: grid;
  gap: 4px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  background: rgba(76, 125, 255, 0.055);
  transition: transform 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}

.playground-link:hover {
  transform: translateY(-2px);
  border-color: rgba(76, 125, 255, 0.42);
  background: rgba(76, 125, 255, 0.10);
}

.playground-link span {
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.playground-link small {
  color: var(--text-muted);
  font-size: 0.86rem;
  line-height: 1.45;
}

.practice-callout,
.setup-panel {
  border: 1px solid rgba(76, 125, 255, 0.24);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at 8% 10%, rgba(76, 125, 255, 0.14), transparent 32%),
    rgba(18, 18, 22, 0.66);
  margin: 0 0 var(--space-8);
}

.practice-callout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5);
}

.practice-callout strong,
.setup-head h2 {
  color: var(--text-primary);
}

.practice-callout p,
.setup-head p {
  margin-bottom: 0;
}

.setup-panel {
  padding: var(--space-6);
}

.setup-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: start;
  gap: var(--space-6);
}

.setup-head h2 {
  margin-bottom: var(--space-3);
  font-size: clamp(1.45rem, 2.4vw, 2.35rem);
}

.setup-code {
  margin-top: var(--space-5);
  max-height: 430px;
  overflow: auto;
}

.notice.slim {
  margin-top: var(--space-4);
  padding: var(--space-4);
}

.notice.slim p {
  margin-bottom: 0;
}

html[data-theme="light"] .practice-callout,
html[data-theme="light"] .setup-panel,
html[data-theme="light"] .playground-link {
  background: #ffffff;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.045);
}

@media (max-width: 900px) {
  .playground-links,
  .setup-head,
  .practice-callout {
    grid-template-columns: 1fr;
  }
}