:root {
  --paper: #fffdf8;
  --surface: #ffffff;
  --surface-soft: #f6f2ea;
  --ink: #1f211d;
  --muted: #746e63;
  --faint: #a39c8f;
  --line: #e3dccd;
  --line-strong: #d3cbbc;
  --green: #2f6d4f;
  --green-strong: #285c43;
  --green-soft: #eaf1ec;
  --on-green: #fffdf8;

  /* document preview (mirrors the reader's real content theme) */
  --doc-bg: #ffffff;
  --doc-ink: #444444;
  --doc-accent: #1874d3;
  --doc-mark: #d3ffa4;
  --doc-code-bg: #f3f5f7;

  --radius: 12px;
  --radius-sm: 8px;
  --shell: 1080px;
  --shadow: 0 1px 2px rgba(31, 33, 29, .04), 0 8px 28px -18px rgba(31, 33, 29, .22);
  --shadow-soft: 0 1px 2px rgba(31, 33, 29, .04);
  --ease: cubic-bezier(.2, .7, .3, 1);
}

:root[data-theme="dark"] {
  --paper: #1a1714;
  --surface: #221d19;
  --surface-soft: #2a241f;
  --ink: #ece7df;
  --muted: #a89f92;
  --faint: #7c7264;
  --line: #352d26;
  --line-strong: #443a31;
  --green: #6bbf8e;
  --green-strong: #7fc99e;
  --green-soft: #232c26;
  --on-green: #14241b;

  --doc-bg: #1d1e1f;
  --doc-ink: #dfe0e0;
  --doc-accent: #44a2e5;
  --doc-mark: #3175a8;
  --doc-code-bg: #2e2f30;

  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 12px 32px -18px rgba(0, 0, 0, .6);
  --shadow-soft: 0 1px 2px rgba(0, 0, 0, .3);
}

@media (prefers-color-scheme: dark) {
  :root[data-theme="system"] {
    --paper: #1a1714;
    --surface: #221d19;
    --surface-soft: #2a241f;
    --ink: #ece7df;
    --muted: #a89f92;
    --faint: #7c7264;
    --line: #352d26;
    --line-strong: #443a31;
    --green: #6bbf8e;
    --green-strong: #7fc99e;
    --green-soft: #232c26;
    --on-green: #14241b;
    --doc-bg: #1d1e1f;
    --doc-ink: #dfe0e0;
    --doc-accent: #44a2e5;
    --doc-mark: #3175a8;
    --doc-code-bg: #2e2f30;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 12px 32px -18px rgba(0, 0, 0, .6);
    --shadow-soft: 0 1px 2px rgba(0, 0, 0, .3);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }

code, kbd, pre { font-family: "SFMono-Regular", Menlo, Consolas, monospace; }

.shell {
  width: min(var(--shell), 100% - 48px);
  margin-inline: auto;
}

.skip {
  position: absolute;
  left: -999px;
  top: 8px;
  background: var(--green);
  color: var(--on-green);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  z-index: 20;
}
.skip:focus { left: 16px; }

.micro {
  margin: 0 0 10px;
  color: var(--green);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
}

/* Masthead */
.masthead {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: saturate(1.1) blur(10px);
  border-bottom: 1px solid var(--line);
}
.masthead-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  height: 60px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-weight: 650;
  font-size: 17px;
  text-decoration: none;
  letter-spacing: -.01em;
}
.nav {
  display: flex;
  gap: 22px;
  margin-left: auto;
}
.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14.5px;
  transition: color .15s var(--ease);
}
.nav a:hover { color: var(--ink); }
.masthead-actions { margin-left: 8px; }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 34px;
  padding: 0 12px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: border-color .15s var(--ease), color .15s var(--ease);
}
.theme-toggle:hover { border-color: var(--green); color: var(--ink); }
.theme-toggle-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: inset 0 0 0 2px var(--surface);
  outline: 1px solid var(--green);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 20px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 550;
  text-decoration: none;
  cursor: pointer;
  transition: transform .12s var(--ease), background .15s var(--ease), border-color .15s var(--ease);
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--green);
  color: var(--on-green);
}
.btn-primary:hover { background: var(--green-strong); }
.btn-ghost {
  background: var(--surface);
  border-color: var(--line-strong);
  color: var(--ink);
}
.btn-ghost:hover { border-color: var(--green); }
.btn[aria-disabled="true"] {
  background: var(--surface-soft);
  color: var(--faint);
  border-color: var(--line);
  cursor: not-allowed;
  pointer-events: none;
}

/* Hero */
.hero {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 56px;
  align-items: center;
  padding: clamp(48px, 8vw, 96px) 0 clamp(40px, 6vw, 72px);
}
.hero-brand {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 0 0 24px;
}
.hero-icon { display: block; }
.hero-name {
  font-size: clamp(28px, 4.2vw, 40px);
  font-weight: 700;
  letter-spacing: -.025em;
}
.eyebrow {
  margin: 0 0 18px;
  color: var(--green);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.hero h1 {
  margin: 0 0 20px;
  font-size: clamp(34px, 5vw, 52px);
  line-height: 1.05;
  letter-spacing: -.025em;
  font-weight: 700;
}
.lead {
  margin: 0 0 28px;
  max-width: 30em;
  font-size: 17px;
  color: var(--muted);
}
.lead code, .card code, .section-lead code {
  background: var(--surface-soft);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 1px 6px;
  font-size: .85em;
  color: var(--ink);
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-note {
  margin: 22px 0 0;
  color: var(--faint);
  font-size: 13.5px;
}

/* Preview window */
.preview-window {
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--doc-bg);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.preview-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 11px 14px;
  background: var(--surface-soft);
  border-bottom: 1px solid var(--line);
}
.preview-bar .dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--line-strong);
}
.preview-title {
  margin-left: 10px;
  color: var(--muted);
  font-size: 12.5px;
  font-family: "SFMono-Regular", Menlo, monospace;
}
.preview-body {
  display: grid;
  grid-template-columns: 1fr 132px;
  min-height: 300px;
}
.doc {
  padding: 22px 24px;
  color: var(--doc-ink);
  font-size: 14px;
  line-height: 1.55;
}
.doc > * { margin: 0 0 13px; }
.doc-h1 {
  font-size: 21px;
  color: var(--doc-ink);
  letter-spacing: -.01em;
}
.doc a { color: var(--doc-accent); text-decoration: none; }
.doc mark { background: var(--doc-mark); color: inherit; border-radius: 3px; padding: 0 2px; }
.callout {
  border-left: 3px solid var(--doc-accent);
  background: color-mix(in srgb, var(--doc-accent) 9%, transparent);
  border-radius: 0 6px 6px 0;
  padding: 10px 14px;
}
.callout p { margin: 0; }
.callout-head {
  color: var(--doc-accent);
  font-weight: 650;
  font-size: 12px;
  margin-bottom: 4px;
}
.todo { list-style: none; padding: 0; }
.todo li { display: flex; align-items: center; gap: 9px; margin: 0 0 6px; }
.todo .box {
  width: 15px; height: 15px;
  border: 1.6px solid var(--faint);
  border-radius: 4px;
  flex: none;
}
.todo .done { color: var(--faint); text-decoration: line-through; }
.todo .done .box {
  background: var(--doc-accent);
  border-color: var(--doc-accent);
  position: relative;
}
.todo .done .box::after {
  content: "";
  position: absolute;
  left: 4px; top: 1px;
  width: 4px; height: 8px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(42deg);
}
.code {
  background: var(--doc-code-bg);
  border-radius: 6px;
  padding: 12px 14px;
  font-size: 12.5px;
  overflow-x: auto;
}
.code .k { color: #ad3da4; }
.code .fn { color: #4a838b; }
.code .s { color: #d12f1b; }
:root[data-theme="dark"] .code .k,
:root[data-theme="dark"] .code .fn { color: #70b8d7; }
:root[data-theme="dark"] .code .s { color: #e6945e; }
@media (prefers-color-scheme: dark) {
  :root[data-theme="system"] .code .k,
  :root[data-theme="system"] .code .fn { color: #70b8d7; }
  :root[data-theme="system"] .code .s { color: #e6945e; }
}
.preview-outline {
  border-left: 1px solid var(--line);
  background: var(--surface-soft);
  padding: 18px 14px;
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.preview-outline .micro { margin-bottom: 4px; }
.preview-outline a {
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
}
.preview-outline a.on { color: var(--green); font-weight: 600; }

/* Sections */
.section { padding: clamp(48px, 7vw, 84px) 0; }
.section-title {
  margin: 0 0 14px;
  font-size: clamp(26px, 3.4vw, 34px);
  letter-spacing: -.02em;
  font-weight: 680;
}
.section-lead {
  margin: 0 0 26px;
  max-width: 56ch;
  color: var(--muted);
  font-size: 16.5px;
}
.band {
  background: var(--surface-soft);
  border-block: 1px solid var(--line);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 26px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow-soft);
}
.card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  letter-spacing: -.01em;
}
.card p { margin: 0; color: var(--muted); font-size: 14.5px; }
kbd {
  display: inline-block;
  min-width: 18px;
  padding: 1px 6px;
  border: 1px solid var(--line-strong);
  border-bottom-width: 2px;
  border-radius: 5px;
  background: var(--surface-soft);
  color: var(--ink);
  font-size: 12px;
  text-align: center;
}

.checklist {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 11px;
  max-width: 56ch;
}
.checklist li {
  position: relative;
  padding-left: 28px;
  color: var(--ink);
}
.checklist li::before {
  content: "";
  position: absolute;
  left: 0; top: 7px;
  width: 8px; height: 13px;
  border: solid var(--green);
  border-width: 0 2.4px 2.4px 0;
  transform: rotate(42deg);
}

/* Downloads */
.downloads .download-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
}
.download-card p { flex: 1; }
.download-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px; height: 46px;
  border-radius: 12px;
  background: var(--green-soft);
  color: var(--green);
  margin-bottom: 4px;
}
.download-cli {
  width: 100%;
  margin: 0;
  padding: 9px 12px;
  background: var(--surface-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--ink);
  overflow-x: auto;
}
.download-cli code::before { content: "$ "; color: var(--green); }
.download-card .btn { width: 100%; }
.download-meta {
  flex: none;
  color: var(--faint);
  font-size: 12.5px;
  font-variant-numeric: tabular-nums;
}
.download-foot {
  margin: 22px 0 0;
  color: var(--faint);
  font-size: 13.5px;
  max-width: 58ch;
}

/* Footer */
.footer {
  border-top: 1px solid var(--line);
  background: var(--surface-soft);
  padding: 30px 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.footer .brand { font-size: 15px; }
.footer-note {
  margin: 0;
  color: var(--muted);
  font-size: 13.5px;
  font-variant-numeric: tabular-nums;
}

/* Responsive */
@media (max-width: 880px) {
  .hero { grid-template-columns: 1fr; gap: 40px; }
  .grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 620px) {
  .nav { display: none; }
  .grid { grid-template-columns: 1fr; }
  .preview-body { grid-template-columns: 1fr; }
  .preview-outline { display: none; }
  .hero-actions .btn { flex: 1; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto; transition: none !important; }
}