:root {
  --bg: #0d1117;
  --bg2: #161b22;
  --bg3: #1c2333;
  --border: #30363d;
  --text: #e6edf3;
  --text2: #8b949e;
  --accent: #58a6ff;
  --accent2: #3fb950;
  --accent3: #d29922;
  --accent4: #f78166;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* Header */
header {
  border-bottom: 1px solid var(--border);
  background: var(--bg2);
  position: sticky; top: 0; z-index: 100;
}
header .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 56px;
}
header .logo { font-size: 20px; font-weight: 700; color: var(--text); }
header .logo span { color: var(--accent2); }
header nav { display: flex; gap: 24px; }
header nav a { color: var(--text2); font-size: 14px; }
header nav a:hover { color: var(--text); }

/* Hero */
.hero {
  padding: 80px 0 60px;
  text-align: center;
  background: linear-gradient(180deg, var(--bg2) 0%, var(--bg) 100%);
}
.hero h1 { font-size: 48px; font-weight: 800; margin-bottom: 16px; }
.hero h1 span { color: var(--accent2); }
.hero p { font-size: 18px; color: var(--text2); max-width: 640px; margin: 0 auto 32px; }
.hero .btns { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px; border-radius: 8px; font-weight: 600; font-size: 15px;
  border: 1px solid var(--border); cursor: pointer; transition: all .15s;
  background: var(--bg3); color: var(--text);
}
.btn:hover { text-decoration: none; border-color: var(--text2); }
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: #4c9aff; border-color: #4c9aff; }
.btn-green { background: var(--accent2); color: #fff; border-color: var(--accent2); }
.btn-green:hover { background: #4cda6a; border-color: #4cda6a; }

/* Sections */
section { padding: 64px 0; border-bottom: 1px solid var(--border); }
section:last-child { border-bottom: none; }
.section-title { font-size: 28px; font-weight: 700; margin-bottom: 8px; }
.section-desc { color: var(--text2); font-size: 16px; margin-bottom: 40px; }

/* Pain points */
.pain-points { padding: 64px 0; }
.pain-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 16px; }
.pain-card { background: var(--bg2); border: 1px solid var(--border); border-radius: 10px; padding: 20px; }
.pain-card h3 { font-size: 14px; font-weight: 600; color: var(--accent2); margin-bottom: 6px; }
.pain-card p { font-size: 14px; color: var(--text2); line-height: 1.6; }

/* Code */
pre, code { font-family: var(--font-mono); }
pre {
  background: var(--bg3); border: 1px solid var(--border); border-radius: 8px;
  padding: 16px; overflow-x: auto; font-size: 13px; line-height: 1.5; margin: 16px 0;
}
code { font-size: .9em; }
pre code { font-size: 13px; color: var(--text); }
.token-keyword { color: #ff7b72; }
.token-string { color: #a5d6ff; }
.token-comment { color: #8b949e; }
.token-variable { color: #d2a8ff; }
.token-builtin { color: #58a6ff; }
.token-operator { color: #79c0ff; }
.token-number { color: #79c0ff; }
.token-fn { color: #d2a8ff; }

/* Tables */
table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 14px; }
th, td { padding: 10px 16px; text-align: left; border-bottom: 1px solid var(--border); }
th { background: var(--bg2); font-weight: 600; color: var(--text2); }
td { color: var(--text2); }
td:first-child { color: var(--text); font-family: var(--font-mono); font-size: 13px; }

/* Compare section */
.compare { padding: 64px 0; border-bottom: 1px solid var(--border); }
.compare-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
.compare-card { background: var(--bg2); border: 1px solid var(--border); border-radius: 10px; padding: 24px; }
.compare-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 4px; }
.compare-card .cmp-label { font-size: 13px; color: var(--text2); margin-bottom: 12px; font-style: italic; }
.compare-card p { font-size: 14px; color: var(--text2); line-height: 1.6; }
.compare-card.mid { border-color: var(--accent3); }
.compare-card.highlight { border-color: var(--accent2); background: linear-gradient(135deg, var(--bg2) 0%, #1a2e1a 100%); }
.compare-card.highlight h3 { color: var(--accent2); }
.code-compare { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 20px; }
.code-compare-card { display: flex; flex-direction: column; background: var(--bg2); border: 1px solid var(--border); border-radius: 10px; padding: 20px; }
.code-compare-card.highlight { border-color: var(--accent2); background: linear-gradient(135deg, var(--bg2) 0%, #1a2e1a 100%); }
.code-compare-card h3 { font-size: 15px; font-weight: 700; margin-bottom: 2px; }
.code-compare-card .cmp-badge { font-size: 12px; color: var(--text2); margin-bottom: 12px; }
.code-compare-card pre { flex: 1; margin: 0; background: var(--bg); border: 1px solid var(--border); border-radius: 6px; padding: 16px; font-size: 13px; line-height: 1.5; overflow-x: auto; }
.code-compare-card code { font-size: 13px; color: var(--text); white-space: pre; }

/* Syntax reference */
.syntax-ref { padding: 64px 0; border-bottom: 1px solid var(--border); }
.syntax-ref .section-title { margin-bottom: 24px; }
.ref-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.ref-card { background: var(--bg2); border: 1px solid var(--border); border-radius: 10px; padding: 20px; display: flex; flex-direction: column; }
.ref-card h3 { font-size: 14px; font-weight: 600; color: var(--text2); margin-bottom: 10px; text-transform: uppercase; letter-spacing: .05em; }
.ref-card pre { margin: 0; background: var(--bg); border: 1px solid var(--border); border-radius: 6px; padding: 16px; font-size: 14px; line-height: 1.6; overflow-x: auto; flex: 1; }
.ref-card pre code { font-size: 14px; }

/* Playground */
.playground-layout {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
  min-height: 500px;
}
.playground-layout .panel {
  background: var(--bg2); border: 1px solid var(--border); border-radius: 8px;
  overflow: hidden; display: flex; flex-direction: column;
}
.panel-header {
  padding: 10px 16px; border-bottom: 1px solid var(--border);
  font-size: 12px; font-weight: 600; color: var(--text2);
  text-transform: uppercase; letter-spacing: .05em;
  display: flex; justify-content: space-between; align-items: center;
}
.panel-body { flex: 1; overflow: auto; padding: 0; }
.editor-wrap {
  position: relative;
  overflow: hidden !important;
  min-height: 400px;
}
.editor-highlight, .editor-wrap textarea {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  width: 100%; height: 100%;
  min-height: 400px;
  font-family: var(--font-mono); font-size: 13px; line-height: 1.5;
  padding: 16px; margin: 0; border: none; outline: none;
  white-space: pre-wrap; overflow-wrap: break-word;
  tab-size: 2;
}
.editor-highlight {
  pointer-events: none;
  color: var(--text);
  overflow: hidden;
  background: var(--bg);
  z-index: 0;
}
.editor-wrap textarea {
  background: transparent;
  color: transparent;
  caret-color: var(--text);
  resize: none;
  z-index: 1;
}
.panel-body .output {
  padding: 16px; font-family: var(--font-mono); font-size: 13px; line-height: 1.5;
  white-space: pre-wrap; min-height: 400px; color: var(--text2);
}
.playground-toolbar {
  display: flex; gap: 8px; padding: 12px 16px;
  border-top: 1px solid var(--border); align-items: center;
  flex-wrap: wrap;
}
.playground-toolbar .btn { padding: 8px 16px; font-size: 13px; }

/* Responsive */
@media (max-width: 768px) {
  .hero h1 { font-size: 32px; }
  .playground-layout { grid-template-columns: 1fr; }
  .playground-layout .panel { min-height: 350px; }
  .editor-wrap { min-height: 350px; }
  .editor-highlight, .editor-wrap textarea { min-height: 350px; }
  .panel-body .output { min-height: 200px; }
  .pain-grid { grid-template-columns: 1fr; }
  .compare-grid { grid-template-columns: 1fr; }
  .ref-grid { grid-template-columns: 1fr; }
  .code-compare { grid-template-columns: 1fr; }
}

/* Toast notification */
.toast {
  position: fixed; bottom: 24px; right: 24px;
  background: var(--accent2); color: #000; padding: 12px 20px;
  border-radius: 8px; font-weight: 600; font-size: 14px;
  transform: translateY(100px); opacity: 0; transition: all .3s;
  z-index: 200;
}
.toast.show { transform: translateY(0); opacity: 1; }
.toast.error { background: var(--accent4); }