:root {
  --bg: #0f1722;
  --bg-soft: #162435;
  --panel: #0d1b2a;
  --border: #d7a15f;
  --text: #f7f4ee;
  --text-soft: #e8ddd0;
  --focus: #9ee8ff;
  --ok: #5ce3a8;
  --warn: #ffd166;
  --danger: #ff9080;
  --info: #9ec8ff;
}

.playground-v3 {
  margin: 0;
  color: var(--text);
  background: linear-gradient(160deg, var(--bg) 0%, var(--bg-soft) 100%);
  font-family: Cambria, "Palatino Linotype", "Book Antiqua", serif;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  background: #fff;
  color: #000;
  padding: 0.45rem 0.6rem;
  z-index: 100;
}

.skip-link:focus {
  left: 0.6rem;
  top: 0.6rem;
}

.playground-v3 .container {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 1rem 2.4rem;
}

.playground-v3 .page-topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  margin: 0 -1rem;
  padding: 0.8rem 1rem;
  background: rgba(9, 16, 25, 0.92);
  border-bottom: 1px solid #4f6c8a;
}

.main-v3 {
  padding-top: 1rem;
  display: grid;
  gap: 0.8rem;
}

.panel {
  border: 2px solid var(--border);
  border-radius: 14px;
  background: var(--panel);
  padding: 0.9rem;
}

.kicker {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.72rem;
  color: #ffd7aa;
  font-weight: 700;
}

.hero h1 {
  margin: 0.6rem 0 0.7rem;
  font-size: clamp(1.8rem, 4.2vw, 2.7rem);
  color: #fff6ea;
}

.hero p,
.alert p,
.callout p,
.checklist li,
.acc-inner {
  color: var(--text-soft);
  line-height: 1.6;
}

h2 {
  margin: 0 0 0.7rem;
  color: #ffe9cc;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.badge {
  border-radius: 999px;
  padding: 0.16rem 0.52rem;
  font-size: 0.74rem;
  font-weight: 700;
  border: 1px solid #ffffff33;
}

.neutral { background: #5f6c7a33; color: #ecf4ff; }
.success { background: #5ce3a833; color: var(--ok); }
.warning { background: #ffd16633; color: var(--warn); }
.danger { background: #ff908033; color: var(--danger); }
.info { background: #9ec8ff33; color: var(--info); }

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.6rem;
}

.alerts {
  display: grid;
  gap: 0.5rem;
}

.alert {
  border: 1px solid #7ea0c266;
  border-radius: 10px;
  padding: 0.58rem 0.68rem;
  background: #1a2a3d;
}

.alert strong {
  display: block;
  margin-bottom: 0.2rem;
}

.alert.info { border-left: 4px solid var(--info); }
.alert.warning { border-left: 4px solid var(--warn); }
.alert.danger { border-left: 4px solid var(--danger); }

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 0.6rem;
}

.tab-btn,
.acc-trigger,
.mini-btn,
.back-btn,
.hamburger-btn,
input,
select,
a {
  outline: none;
}

.tab-btn,
.mini-btn {
  border: 1px solid #8fb0d1;
  border-radius: 999px;
  background: #1a2a3d;
  color: #f7f2ea;
  padding: 0.36rem 0.7rem;
  font-family: inherit;
  font-weight: 700;
  cursor: pointer;
}

.tab-btn.active {
  background: #f7c78e;
  color: #1f1206;
  border-color: #ffe4bf;
}

.tab-content { display: none; }
.tab-content.active { display: block; }

.callout {
  border: 2px solid #8cd6ef;
  border-left-width: 5px;
  border-radius: 10px;
  padding: 0.6rem 0.7rem;
  background: #172b3d;
}

.callout h3 {
  margin: 0 0 0.25rem;
  color: #d5f4ff;
}

.snippet {
  margin: 0;
  border: 1px solid #8fb0d1;
  border-radius: 10px;
  background: #0f1a28;
  padding: 0.65rem;
  color: #dff4ff;
  overflow: auto;
}

.checklist {
  margin: 0;
  padding-left: 1.05rem;
  display: grid;
  gap: 0.35rem;
}

.accordion {
  display: grid;
  gap: 0.45rem;
}

.acc-item {
  border: 1px solid #8fb0d166;
  border-radius: 10px;
  overflow: hidden;
  background: #1a2a3d;
}

.acc-item h3 {
  margin: 0;
}

.acc-trigger {
  width: 100%;
  border: 0;
  background: transparent;
  color: #f8efdf;
  cursor: pointer;
  padding: 0.58rem 0.68rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: inherit;
  font-weight: 700;
}

.acc-icon {
  display: inline-grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 999px;
  color: #231306;
  background: #f7c78e;
}

.acc-content {
  height: 0;
  overflow: hidden;
  transition: height 0.22s ease;
}

.acc-inner {
  padding: 0 0.68rem 0.68rem;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

@media (max-width: 720px) {
  .playground-v3 .container {
    padding: 0 0.75rem 2rem;
  }

  .playground-v3 .page-topbar {
    margin: 0 -0.75rem;
    padding: 0.75rem;
  }
}