:root {
  --ink: #1f2933;
  --muted: #5f6c78;
  --paper: #fffdf9;
  --wash: #f3f7f6;
  --line: #d9e2e1;
  --deep-sea: #173f4a;
  --sea: #2d6b72;
  --coral: #e44e20;
  --periwinkle: #545fbd;
  --code: #17232b;
  --code-ink: #e8f2f1;
  --shadow: 0 16px 42px rgba(23, 63, 74, 0.10);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 2rem;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.68;
}

a { color: var(--sea); }
a:hover { color: var(--coral); }

.hero {
  position: relative;
  overflow: hidden;
  color: white;
  background: url("header_background.png") center / cover no-repeat;
}

.hero::after {
  display: none;
}

.hero__inner {
  position: relative;
  z-index: 1;
  width: min(1120px, calc(100% - 2.5rem));
  margin: 0 auto;
  padding: 5rem 0 4.5rem;
}

.eyebrow,
.sidebar__label {
  margin: 0 0 0.65rem;
  color: #cde5df;
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 780px;
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
font-size: clamp(2.375rem, 5.7vw, 4.56rem);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.02;
}

.hero h1 code {
  padding: 0;
  color: #d9efb6;
  background: transparent;
  font-family: inherit;
}

.hero__summary {
  max-width: 760px;
  margin: 1.35rem 0 0;
  color: #e4f0ed;
  font-size: 1.12rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.8rem;
}

.button {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.65rem 1rem;
  border: 1px solid rgba(255,255,255,0.45);
  border-radius: 999px;
  color: white;
  font-size: 0.9rem;
  font-weight: 750;
  text-decoration: none;
}

.button:hover { color: white; transform: translateY(-1px); }
.button--primary { border-color: var(--coral); background: var(--coral); }
.button--secondary { background: rgba(255,255,255,0.08); }

.page-shell {
  display: grid;
  grid-template-columns: 255px minmax(0, 780px);
  gap: 4.25rem;
  width: min(1120px, calc(100% - 2.5rem));
  margin: 0 auto;
  padding: 3.5rem 0 6rem;
}

.sidebar { position: relative; }

.sidebar__card {
  position: sticky;
  top: 1.5rem;
  max-height: calc(100vh - 3rem);
  overflow-y: auto;
  padding: 1.15rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--wash);
}

.sidebar__label { color: var(--sea); }

.sidebar ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.sidebar ul ul {
  margin: 0.2rem 0 0.45rem 0.85rem;
  padding-left: 0.7rem;
  border-left: 1px solid #cbd8d6;
}

.sidebar a {
  display: block;
  padding: 0.24rem 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.32;
  text-decoration: none;
}

.sidebar a:hover,
.sidebar a.is-active { color: var(--coral); }

.tutorial { min-width: 0; }

.tutorial > section,
.tutorial > h1 {
  scroll-margin-top: 1.5rem;
}

.tutorial h1,
.tutorial h2,
.tutorial h3 {
  color: var(--deep-sea);
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.18;
}

.tutorial h1 {
  margin: 4.5rem 0 1rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--line);
  font-size: 2.15rem;
}

.tutorial h1:first-of-type { margin-top: 1.5rem; }

.tutorial h2 {
  margin: 2.75rem 0 0.85rem;
  font-size: 1.48rem;
}

.tutorial h3 { margin-top: 2rem; }

.tutorial code:not(pre code) {
  padding: 0.12em 0.38em;
  border-radius: 5px;
  color: #9d3519;
  background: #f8ece7;
  font-size: 0.88em;
}

.tutorial pre {
  position: relative;
  margin: 1.25rem 0 1.8rem;
  padding: 1.25rem 1.25rem 1.2rem;
  overflow-x: auto;
  border: 1px solid #31434d;
  border-radius: 12px;
  color: var(--code-ink);
  background: var(--code);
  box-shadow: var(--shadow);
  font-size: 0.83rem;
  line-height: 1.58;
  tab-size: 2;
}

.tutorial pre code { font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; }

.copy-button {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  z-index: 2;
  padding: 0.38rem 0.65rem;
  border: 1px solid rgba(255,255,255,0.24);
  border-radius: 7px;
  color: #eaf4f1;
  background: rgba(255,255,255,0.10);
  font: inherit;
  font-size: 0.72rem;
  font-weight: 750;
  cursor: pointer;
}

.copy-button:hover { background: rgba(255,255,255,0.18); }
.copy-button.is-copied { border-color: #92d050; color: #ccefaa; }

.callout {
  margin-bottom: 2rem;
  padding: 1.1rem 1.2rem;
  border: 1px solid #c7dcda;
  border-left: 5px solid var(--coral);
  border-radius: 10px;
  background: #f4f9f8;
}

.callout strong { color: var(--deep-sea); }
.callout p { margin: 0.35rem 0 0; }

.tutorial table {
  width: 100%;
  margin: 1.4rem 0;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.tutorial th,
.tutorial td {
  padding: 0.65rem 0.75rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

.tutorial th { color: var(--deep-sea); background: var(--wash); }

footer {
  padding: 1.6rem;
  color: #dce9e7;
  background: var(--deep-sea);
  text-align: center;
  font-size: 0.85rem;
}

footer a { color: white; }

@media (max-width: 900px) {
  .page-shell { grid-template-columns: 1fr; gap: 1.5rem; }
  .sidebar__card { position: static; max-height: none; }
  .sidebar ul ul { display: none; }
  .hero__inner { padding: 4rem 0 3.5rem; }
}

@media (max-width: 560px) {
  body { font-size: 16px; }
  .hero__inner,
  .page-shell { width: min(100% - 1.4rem, 1120px); }
  .tutorial pre { margin-left: -0.2rem; margin-right: -0.2rem; padding: 1rem; }
  .copy-button { position: sticky; float: right; }
}

.tutorial .expected-result pre,
.tutorial .expected-result pre code {
  font-size: 11px !important;
  font-weight: 300 !important;
  line-height: 1.4;
  color: #656D6D;
}

.hero__inner {
  padding-top: 10rem;
}

.example-file-button {
  display: inline-block;
  margin: 0.25rem 0;
  padding: 0.4rem 0.75rem;
  color: white;
  background-color: #e44e20;
  border-radius: 0.4rem;
  font-family: monospace;
  font-size: 0.9rem;
  font-weight: normal;
  line-height: 1.3;
  text-decoration: none;
}

.example-file-button:hover {
  color: white;
  background-color: #c93d16;
  text-decoration: none;
}

.reference-list {
  padding-left: 1.5rem;
}

.reference-list li {
  margin-bottom: 1.25rem;
  padding-left: 0.35rem;
  line-height: 1.6;
}

.reference-list a {
  color: #e44e20;
  overflow-wrap: anywhere;
}

.citation-box {
  margin: 1rem 0;
  padding: 1rem 1.25rem;
  background: #f7f3ef;
  border-left: 4px solid #e44e20;
  line-height: 1.6;
}

.citation-box a {
  color: #e44e20;
  overflow-wrap: anywhere;
}