:root {
  --bg0: #12110f;
  --bg1: #1c1916;
  --bg2: #26221d;
  --ink: #f2ebe1;
  --muted: #a89b8c;
  --accent: #d9773a;
  --accent2: #7eb89a;
  --danger: #e06c75;
  --line: rgba(242, 235, 225, 0.12);
  --code: #0e0d0b;
  --radius: 14px;
  --font-display: "Fraunces", "Iowan Old Style", Georgia, serif;
  --font-body: "IBM Plex Sans", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "ui-monospace", Menlo, Consolas, monospace;
  --nav-h: 64px;
  --side-w: 280px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(217, 119, 58, 0.18), transparent 55%),
    radial-gradient(900px 500px at 90% 0%, rgba(126, 184, 154, 0.12), transparent 50%),
    linear-gradient(180deg, #171512 0%, var(--bg0) 40%, #0f0e0c 100%);
  line-height: 1.55;
}

a { color: var(--accent2); text-decoration: none; }
a:hover { text-decoration: underline; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0 clamp(1rem, 3vw, 2rem);
  background: rgba(18, 17, 15, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--ink);
  text-decoration: none;
}
.brand span { color: var(--accent); }
.brand small {
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: wrap;
}
.nav a {
  color: var(--muted);
  padding: 0.45rem 0.75rem;
  border-radius: 999px;
  text-decoration: none;
  font-size: 0.92rem;
}
.nav a:hover, .nav a.active {
  color: var(--ink);
  background: rgba(242, 235, 225, 0.08);
  text-decoration: none;
}

.btn {
  appearance: none;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.65rem 1.1rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: transform .15s ease, background .15s ease, border-color .15s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--accent);
  color: #1a120c;
}
.btn-primary:hover { filter: brightness(1.05); }
.btn-ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--ink);
}
.btn-ghost:hover { background: rgba(242, 235, 225, 0.06); }

.hero {
  padding: clamp(2rem, 6vw, 4.5rem) clamp(1rem, 3vw, 2rem) 1.5rem;
  max-width: 1100px;
  margin: 0 auto;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 7vw, 4.4rem);
  line-height: 1.05;
  margin: 0 0 0.75rem;
  letter-spacing: -0.02em;
}
.hero h1 em {
  font-style: italic;
  color: var(--accent);
}
.hero p {
  max-width: 42rem;
  color: var(--muted);
  font-size: clamp(1rem, 2.4vw, 1.15rem);
  margin: 0 0 1.4rem;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.7rem; }

.playground {
  display: grid;
  grid-template-columns: 1.2fr 0.9fr;
  gap: 1rem;
  max-width: 1200px;
  margin: 0 auto 2.5rem;
  padding: 0 clamp(1rem, 3vw, 2rem);
}
.panel {
  background: rgba(28, 25, 22, 0.92);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  min-width: 0;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.28);
}
.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.18);
}
.panel-head h2 {
  margin: 0;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.panel-tools { display: flex; gap: 0.4rem; flex-wrap: wrap; align-items: center; }
.panel-tools select, .panel-tools label {
  font-size: 0.85rem;
  color: var(--muted);
}
.panel-tools select {
  background: var(--bg2);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.35rem 0.5rem;
}

#editor, #output {
  width: 100%;
  min-height: min(52vh, 480px);
  margin: 0;
  padding: 1rem;
  border: 0;
  resize: vertical;
  background: var(--code);
  color: #efe6d8;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  line-height: 1.5;
  outline: none;
}
#output {
  white-space: pre-wrap;
  overflow: auto;
  color: #c8f0d8;
}
#output.error { color: #ffb4b4; }

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  max-width: 1200px;
  margin: 0 auto 3rem;
  padding: 0 clamp(1rem, 3vw, 2rem);
}
.chip {
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.03);
  color: var(--muted);
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
  font-size: 0.82rem;
}

.footer {
  padding: 2rem clamp(1rem, 3vw, 2rem) 3rem;
  color: var(--muted);
  font-size: 0.88rem;
  text-align: center;
  border-top: 1px solid var(--line);
}

/* Docs layout */
.docs-shell {
  display: grid;
  grid-template-columns: var(--side-w) 1fr;
  min-height: calc(100vh - var(--nav-h));
}
.sidebar {
  position: sticky;
  top: var(--nav-h);
  height: calc(100vh - var(--nav-h));
  overflow: auto;
  border-right: 1px solid var(--line);
  background: rgba(14, 13, 11, 0.72);
  padding: 1.1rem 0.9rem 2rem;
}
.sidebar h3 {
  margin: 1.1rem 0.55rem 0.4rem;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}
.sidebar a {
  display: block;
  color: var(--muted);
  padding: 0.38rem 0.7rem;
  border-radius: 8px;
  text-decoration: none;
  font-size: 0.92rem;
}
.sidebar a:hover, .sidebar a.active {
  background: rgba(217, 119, 58, 0.12);
  color: var(--ink);
  text-decoration: none;
}
.docs-main {
  max-width: 820px;
  padding: clamp(1.2rem, 3vw, 2.5rem);
}
.docs-main h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  margin: 0 0 0.6rem;
}
.docs-main h2 {
  font-family: var(--font-display);
  font-size: 1.55rem;
  margin: 2.4rem 0 0.7rem;
  scroll-margin-top: calc(var(--nav-h) + 16px);
}
.docs-main h3 {
  margin: 1.5rem 0 0.5rem;
  scroll-margin-top: calc(var(--nav-h) + 16px);
}
.docs-main p, .docs-main li { color: #d8cfc3; }
.docs-main code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: rgba(255,255,255,0.06);
  padding: 0.1em 0.35em;
  border-radius: 5px;
}
.docs-main pre {
  background: var(--code);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem 1.1rem;
  overflow: auto;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.5;
}
.docs-main pre code { background: none; padding: 0; }
.callout {
  border-left: 3px solid var(--accent);
  background: rgba(217, 119, 58, 0.08);
  padding: 0.85rem 1rem;
  border-radius: 0 10px 10px 0;
  margin: 1rem 0;
  color: #eadfd2;
}
.menu-btn {
  display: none;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink);
  border-radius: 10px;
  padding: 0.45rem 0.7rem;
  cursor: pointer;
}
.sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  z-index: 45;
}

@media (max-width: 920px) {
  .playground { grid-template-columns: 1fr; }
  #editor, #output { min-height: 38vh; }
  .docs-shell { grid-template-columns: 1fr; }
  .menu-btn { display: inline-flex; }
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: min(86vw, 320px);
    height: 100vh;
    z-index: 50;
    transform: translateX(-105%);
    transition: transform .2s ease;
    padding-top: 1.2rem;
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar-backdrop.open { display: block; }
}

@media (max-width: 560px) {
  .brand small { display: none; }
  .nav a { padding: 0.4rem 0.55rem; font-size: 0.85rem; }
  .panel-head { flex-direction: column; align-items: flex-start; }
}