/* HT Letterspacer — shared styles for landing + tutorial */

:root {
  --bg: #f5f1e8;
  --bg-alt: #ffffff;
  --bg-deep: #14110d;
  --ink: #1a1612;
  --ink-soft: #3a3530;
  --muted: #6e655c;
  --line: #d9d2c2;
  --line-soft: #ebe5d8;
  --accent: #b8442b;
  --accent-soft: #f3e2dc;
  --max: 1280px;
  --gutter: clamp(1.25rem, 4vw, 2.5rem);
  --serif: 'Alegreya', Georgia, 'Times New Roman', serif;
  --sc: 'Alegreya SC', Georgia, serif;
  --sans: 'Sarala', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'JetBrains Mono', 'SF Mono', Menlo, Consolas, monospace;
  --t: 320ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
  margin: 0;
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
h1, h2, h3, h4, h5, h6, p, ul, ol, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
::selection { background: var(--accent); color: var(--bg); }

/* Layout */
.container {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}
.section { padding: clamp(2.5rem, 5vw, 5rem) 0; }
.section--alt { background: var(--bg-alt); }
.section__head { margin-bottom: clamp(3rem, 6vw, 5rem); max-width: 60ch; }

/* Typography */
h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.1;
  color: var(--ink);
}
h1 { font-size: clamp(3rem, 9vw, 6.5rem); line-height: 1; }
h2 { font-size: clamp(2.25rem, 5.5vw, 4rem); }
h3 { font-size: clamp(1.35rem, 2.2vw, 1.625rem); line-height: 1.25; }
h4 { font-size: 1.125rem; line-height: 1.3; }
p { font-size: 1.0625rem; }
strong, b { color: var(--ink); font-weight: 700; }

.lead {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 500;
  font-size: clamp(1.375rem, 2.6vw, 1.75rem);
  line-height: 1.45;
  color: var(--ink-soft);
}
.eyebrow {
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.25rem;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}
.eyebrow::before { content: ''; width: 28px; height: 1px; background: var(--accent); }

/* Site header */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  background: rgba(245, 241, 232, 0.78);
  border-bottom: 1px solid transparent;
  transition: border-color var(--t);
}
.site-header.is-scrolled { border-bottom-color: var(--line-soft); }
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding-top: 1.1rem;
  padding-bottom: 1.1rem;
}
.brand { display: inline-flex; align-items: center; color: var(--ink); }
.brand img { height: 22px; width: auto; }

.site-nav { display: none; }
.site-nav ul { display: flex; gap: 2.25rem; }
.site-nav a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--ink-soft);
  position: relative;
  padding-bottom: 2px;
  transition: color var(--t);
}
.site-nav a::after {
  content: '';
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t);
}
.site-nav a:hover { color: var(--accent); }
.site-nav a:hover::after { transform: scaleX(1); }
@media (min-width: 820px) { .site-nav { display: flex; } }

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--ink-soft);
  transition: color var(--t);
}
.back-link:hover { color: var(--accent); }
.back-link .arrow { transition: transform var(--t); }
.back-link:hover .arrow { transform: translateX(-3px); }

/* Lang switcher */
.lang-switch {
  display: inline-flex;
  gap: 0.2rem;
  padding: 3px;
  background: var(--line-soft);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}
.lang-switch a {
  padding: 0.3rem 0.65rem;
  border-radius: 999px;
  color: var(--muted);
  transition: background var(--t), color var(--t);
}
.lang-switch a.is-active { background: var(--ink); color: var(--bg); }
.lang-switch a:not(.is-active):hover { color: var(--ink); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.95rem 1.5rem;
  border-radius: 999px;
  font-family: var(--sans);
  font-weight: 700;
  font-size: 0.9375rem;
  border: 1px solid transparent;
  transition: transform var(--t), background var(--t), color var(--t), border-color var(--t);
}
.btn:hover { transform: translateY(-1px); }
.btn--sm { padding: 0.55rem 1.1rem; font-size: 0.8125rem; }
.btn--primary { background: var(--ink); color: var(--bg); }
.btn--primary:hover { background: var(--accent); }
.btn--ghost { color: var(--ink); border-color: var(--ink); }
.btn--ghost:hover { background: var(--ink); color: var(--bg); }
.btn--light { background: var(--bg); color: var(--ink); }
.btn--light:hover { background: var(--accent); color: var(--bg); }
.btn--outline-light { color: var(--bg); border-color: rgba(245, 241, 232, 0.4); }
.btn--outline-light:hover { background: var(--bg); color: var(--ink); border-color: var(--bg); }
.btn .arrow { transition: transform var(--t); }
.btn:hover .arrow { transform: translateX(3px); }

/* Inline prose links */
.prose a, .accordion__body a, figcaption a, .content a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 4px;
  text-decoration-thickness: 1.5px;
  transition: color var(--t);
}
.prose a:hover, .accordion__body a:hover, figcaption a:hover, .content a:hover { color: var(--accent); }

/* Hero (landing) */
.hero {
  position: relative;
  padding: clamp(4rem, 8vh, 6rem) 0 clamp(3rem, 5vw, 4rem);
  text-align: center;
  overflow: hidden;
}
.hero__logo { max-width: min(720px, 86vw); margin: 0 auto 2.25rem; }
.hero__sub {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(1.25rem, 2.4vw, 1.625rem);
  color: var(--muted);
  max-width: 36ch;
  margin: 0 auto;
}
.hero__ctas {
  margin-top: 2.75rem;
  display: flex;
  gap: 0.85rem;
  justify-content: center;
  flex-wrap: wrap;
}
/* Tutorial hero */
.tut-hero {
  padding: clamp(4rem, 8vh, 6rem) 0 clamp(3rem, 6vw, 5rem);
  text-align: center;
}
.tut-hero__logo {
  max-width: min(420px, 70vw);
  margin: 0 auto 1.5rem;
  opacity: 0.95;
}
.tut-hero h1 {
  font-style: italic;
  max-width: 18ch;
  margin: 0 auto;
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  letter-spacing: 0.01em;
}
.tut-hero__sub {
  margin-top: 1.5rem;
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  color: var(--muted);
}
.tut-hero__meta {
  margin-top: 2rem;
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}
.tut-hero__meta span + span { margin-left: 1rem; padding-left: 1rem; border-left: 1px solid var(--line); }

/* Quotes */
.quotes {
  padding: clamp(1.5rem, 3vw, 2.5rem) 0 clamp(2.5rem, 5vw, 4rem);
  border-top: 1px solid var(--line-soft);
}
.quotes__grid {
  display: grid;
  gap: clamp(2rem, 4vw, 3.5rem);
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  align-items: start;
}
.quote { font-family: var(--serif); }
.quote__mark {
  font-size: 3rem;
  line-height: 1;
  font-style: italic;
  color: var(--accent);
  margin-bottom: 0.5rem;
  display: block;
}
.quote__body {
  font-size: 1.1875rem;
  font-style: italic;
  line-height: 1.5;
  color: var(--ink-soft);
  margin-bottom: 1rem;
}
.quote cite {
  font-family: var(--sans);
  font-style: normal;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

/* Concepts grid (landing) */
.concepts__grid {
  display: grid;
  gap: clamp(2.5rem, 5vw, 5rem);
  align-items: start;
}
@media (min-width: 900px) { .concepts__grid { grid-template-columns: 1.1fr 1fr; } }
.concepts__sidenotes p + p { margin-top: 1rem; }
.concepts__sidenotes p { color: var(--ink-soft); }

/* Accordion */
.accordion { margin-top: clamp(3rem, 6vw, 5rem); }
.accordion details {
  border-top: 1px solid var(--line);
  padding: 1.5rem 0;
}
.accordion details:last-of-type { border-bottom: 1px solid var(--line); }
.accordion summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1.5rem;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.25rem, 2.2vw, 1.5rem);
  color: var(--ink);
  transition: color var(--t);
}
.accordion summary::-webkit-details-marker { display: none; }
.accordion summary:hover { color: var(--accent); }
.accordion summary .toggle {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--ink-soft);
  position: relative;
  transition: background var(--t), border-color var(--t);
}
.accordion summary .toggle::before,
.accordion summary .toggle::after {
  content: '';
  position: absolute;
  background: var(--ink);
  transition: background var(--t), transform var(--t);
}
.accordion summary .toggle::before {
  top: 50%; left: 25%; right: 25%; height: 1.5px;
  transform: translateY(-50%);
}
.accordion summary .toggle::after {
  top: 25%; bottom: 25%; left: 50%; width: 1.5px;
  transform: translateX(-50%);
}
.accordion details[open] summary { color: var(--accent); }
.accordion details[open] summary .toggle {
  background: var(--accent);
  border-color: var(--accent);
}
.accordion details[open] summary .toggle::before { background: var(--bg); }
.accordion details[open] summary .toggle::after { transform: translateX(-50%) scaleY(0); }
.accordion__body {
  padding-top: 1.25rem;
  max-width: 72ch;
  color: var(--ink-soft);
}
.accordion__body p + p { margin-top: 0.85rem; }
.accordion__body ol { padding-left: 1.25rem; list-style: decimal; }
.accordion__body ol li { margin-bottom: 0.65rem; }
.accordion__body ol li::marker { color: var(--accent); font-weight: 700; }
.accordion__body figure { margin: 1.25rem 0 0; }

/* Code */
code {
  font-family: var(--mono);
  font-size: 0.875em;
  background: var(--line-soft);
  padding: 0.12em 0.42em;
  border-radius: 4px;
  color: var(--ink);
}
.section--alt code { background: var(--bg); }
pre {
  background: var(--bg-deep);
  color: #f5f1e8;
  padding: 1.25rem 1.5rem;
  border-radius: 10px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.875rem;
  line-height: 1.4;
  margin: 1.5rem 0;
}
pre code, .section--alt pre code { background: transparent; padding: 0; color: inherit; font-size: inherit; border-radius: 0; }

.codeblock {
  background: var(--bg-deep);
  color: #f5f1e8;
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
  font-family: var(--mono);
  font-size: 0.8125rem;
  line-height: 1.4;
  margin: 1.5rem 0;
  overflow-x: auto;
}
.content .codeblock p, .codeblock p { color: #f5f1e8; margin: 0; padding: 0; line-height: 1.35; }
.cb-comment { color: var(--accent); }

/* Tabs (landing usage) */
.tabs__list {
  display: inline-flex;
  padding: 4px;
  background: var(--line-soft);
  border-radius: 999px;
  margin-bottom: 1.75rem;
}
.section--alt .tabs__list { background: var(--bg); }
.tabs__list button {
  padding: 0.5rem 1.1rem;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--muted);
  border-radius: 999px;
  transition: background var(--t), color var(--t);
}
.tabs__list button[aria-selected="true"] { background: var(--ink); color: var(--bg); }
.tabs__panel { display: none; }
.tabs__panel.is-active { display: block; animation: fade 320ms ease both; }
@keyframes fade {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: none; }
}
.tabs__panel img {
  margin: 1rem 0;
  border-radius: 8px;
  border: 1px solid var(--line-soft);
}

/* Callout */
.callout {
  background: var(--accent-soft);
  border-radius: 12px;
  padding: 1.5rem 1.75rem;
  margin: 2rem 0;
}
.callout__label {
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}
.callout p, .callout li { color: var(--ink); font-size: 1rem; }
.callout p + p { margin-top: 0.5rem; }

/* Aside card */
.aside-card {
  background: var(--bg-alt);
  border-radius: 14px;
  padding: 1.75rem 2rem;
  margin: 2.5rem 0;
  border: 1px solid var(--line-soft);
}
.aside-card h4 {
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}
.aside-card p, .aside-card li { color: var(--ink-soft); }
.aside-card ul, .aside-card ol { margin: 0.5rem 0; padding-left: 1.5rem; }
.aside-card ul { list-style: disc; }
.aside-card ol { list-style: decimal; }

/* Summary block */
.summary-block {
  background: var(--bg-alt);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--accent);
  border-radius: 12px;
  padding: 1.75rem 2rem;
  margin: 2.5rem 0;
}
.summary-block h3 {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.375rem;
  margin-bottom: 1rem;
  color: var(--ink);
}
.summary-block ul, .summary-block ol { margin: 0; padding-left: 1.5rem; }
.summary-block ul { list-style: disc; }
.summary-block ol { list-style: decimal; }
.summary-block li { color: var(--ink-soft); margin-bottom: 0.5rem; }

/* Params (landing) */
.param {
  padding: clamp(2rem, 4vw, 3rem) 0;
  border-top: 1px solid var(--line);
}
.param:first-of-type { border-top: none; padding-top: 1rem; }
.param__num {
  font-family: var(--sc);
  font-size: 0.875rem;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin-bottom: 0.4rem;
}
.param__name {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 600;
  margin-bottom: 0.8rem;
}
.param__name code {
  background: transparent;
  padding: 0;
  font-family: var(--mono);
  font-size: 0.7em;
  color: var(--accent);
}
.param__title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.375rem;
  color: var(--ink);
  margin-bottom: 0.5rem;
}
.param__title em {
  font-family: var(--mono);
  font-style: normal;
  color: var(--accent);
  font-size: 0.85em;
}
.param p { color: var(--ink-soft); }
.param p + p { margin-top: 0.75rem; }

.gallery {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin-top: 1.75rem;
}
.gallery a {
  display: block;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  transition: transform var(--t), box-shadow var(--t), border-color var(--t);
}
.gallery a:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 38px -22px rgba(0,0,0,0.25);
  border-color: var(--line);
}

/* Data table */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.75rem 0;
  font-size: 0.9375rem;
}
.data-table th, .data-table td {
  text-align: left;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line-soft);
  vertical-align: top;
}
.data-table th {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
}
.data-table td:first-child {
  font-weight: 700;
  padding-right: 1.5rem;
  white-space: nowrap;
  color: var(--ink);
}
.data-table td { color: var(--ink-soft); }

/* Contribute card */
.contribute-card {
  background: var(--bg-deep);
  color: var(--bg);
  border-radius: 24px;
  padding: clamp(3rem, 7vw, 6rem) clamp(2rem, 6vw, 5rem);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.contribute-card::before {
  content: '{ }';
  font-family: var(--serif);
  font-style: italic;
  position: absolute;
  font-size: 22rem;
  line-height: 1;
  top: -3rem;
  right: -2rem;
  color: rgba(184, 68, 43, 0.15);
  pointer-events: none;
}
.contribute-card h2 { color: var(--bg); position: relative; }
.contribute-card .eyebrow { color: var(--accent-soft); }
.contribute-card .eyebrow::before { background: var(--accent-soft); }
.contribute-card p {
  max-width: 50ch;
  margin: 1.25rem auto 2.25rem;
  color: rgba(245, 241, 232, 0.72);
  font-size: 1.125rem;
  position: relative;
}
.contribute-card__ctas {
  display: flex;
  gap: 0.85rem;
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
}

/* Tutorial two-column layout */
.layout {
  display: grid;
  gap: clamp(2rem, 4vw, 4rem);
  padding-bottom: clamp(4rem, 8vw, 7rem);
}
@media (min-width: 980px) { .layout { grid-template-columns: 240px 1fr; } }

/* Table of contents */
.toc { font-size: 0.875rem; }
.toc__inner { position: sticky; top: 90px; padding-top: 1rem; }
.toc__title {
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.25rem;
}
.toc ol { counter-reset: tocnum; list-style: none; }
.toc ol > li {
  counter-increment: tocnum;
  padding: 0.4rem 0;
  border-top: 1px solid var(--line-soft);
  position: relative;
  padding-left: 2rem;
}
.toc ol > li:first-child { border-top: none; }
.toc ol > li::before {
  content: counter(tocnum, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.4rem;
  font-family: var(--sc);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}
.toc ol ol {
  margin-top: 0.4rem;
  padding-left: 0;
  list-style: none;
}
.toc ol ol li {
  border: none;
  padding: 0.2rem 0;
  font-size: 0.8125rem;
}
.toc ol ol li::before { content: '·'; left: -0.5rem; top: 0.2rem; }
.toc a {
  color: var(--ink-soft);
  transition: color var(--t);
  display: block;
  line-height: 1.35;
}
.toc a:hover { color: var(--accent); }
@media (max-width: 979px) { .toc__inner { position: static; padding: 0; } }

/* Tutorial content area */
.content { max-width: 72ch; }
.content p, .content ul li, .content ol li { color: var(--ink-soft); }
.content p { margin-bottom: 1.1rem; }
.content p:last-child { margin-bottom: 0; }
.content ul, .content ol { margin: 1rem 0 1.25rem; padding-left: 1.5rem; }
.content ul { list-style: disc; }
.content ol { list-style: decimal; }
.content ul li::marker, .content ol li::marker { color: var(--accent); }
.content li { margin-bottom: 0.4rem; }

.step {
  padding: clamp(3rem, 6vw, 5rem) 0;
  border-top: 1px solid var(--line);
}
.step:first-of-type { border-top: none; padding-top: 0; }
.step__num {
  font-family: var(--sc);
  font-size: 0.875rem;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin-bottom: 0.5rem;
}
.step h2 { margin-bottom: 1.25rem; }

.subhead {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 600;
  font-size: 1.375rem;
  color: var(--ink);
  margin: 2.5rem 0 1rem;
}
.subhead-eyebrow {
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 2.5rem 0 0.4rem;
}
.subhead-eyebrow + .subhead { margin-top: 0; }

/* Figures */
figure { margin: 2rem 0; }
figure img {
  border-radius: 10px;
  border: 1px solid var(--line-soft);
  width: 100%;
}
figure a { display: block; }
figcaption {
  margin-top: 0.85rem;
  font-size: 0.9375rem;
  color: var(--muted);
  line-height: 1.55;
}
figcaption p { color: var(--muted); margin-bottom: 0.5rem; }
figcaption p:last-child { margin-bottom: 0; }
figcaption ol, figcaption ul { margin: 0.5rem 0; padding-left: 1.25rem; }
figcaption ol { list-style: decimal; }
figcaption ul { list-style: disc; }
figcaption li { color: var(--muted); margin-bottom: 0.35rem; }
figcaption strong { color: var(--ink-soft); }

/* kbd */
kbd {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.78em;
  font-weight: 500;
  background: var(--line-soft);
  color: var(--ink);
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  padding: 0.05em 0.45em;
  border-radius: 5px;
  line-height: 1.3;
  vertical-align: 0.05em;
  white-space: nowrap;
}

/* Reference list */
.ref-list { display: grid; gap: 0; margin-top: 1.5rem; }
.ref-list li {
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--line-soft);
  color: var(--ink-soft);
  font-size: 0.9375rem;
  line-height: 1.5;
}
.ref-list li:last-child { border-bottom: none; }

/* Credit card (tutorial bottom) */
.credit-card {
  background: var(--bg-deep);
  color: var(--bg);
  border-radius: 24px;
  padding: clamp(2.5rem, 5vw, 4rem) clamp(1.5rem, 3vw, 2.5rem);
  margin: 4rem 0 2rem;
  text-align: center;
}
.credit-card .eyebrow { color: var(--accent-soft); }
.credit-card .eyebrow::before { background: var(--accent-soft); }
.credit-card h3 {
  color: var(--bg);
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: 1rem;
}
.credit-card p {
  color: rgba(245, 241, 232, 0.72);
  max-width: 56ch;
  margin: 0 auto 1.5rem;
}
.credit-card a {
  color: var(--bg);
  text-decoration: underline;
  text-decoration-color: var(--accent);
}

.to-top {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 2rem;
  transition: color var(--t);
}
.to-top:hover { color: var(--accent); }

/* Site footer */
.site-footer {
  padding: 2.5rem 0;
  border-top: 1px solid var(--line-soft);
  font-size: 0.875rem;
  color: var(--muted);
}
.site-footer__row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.site-footer ul { display: flex; gap: 1.75rem; flex-wrap: wrap; }
.site-footer a { transition: color var(--t); }
.site-footer a:hover { color: var(--ink); }
.site-footer__licence {
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line-soft);
  font-size: 0.6875rem;
  line-height: 1.5;
  color: var(--muted);
  max-width: 70ch;
}
.site-footer__licence a { text-decoration: underline; text-decoration-color: var(--line); }
.site-footer__licence a:hover { color: var(--ink); }

/* Lightbox */
.content img, .section img { cursor: zoom-in; }
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(20, 17, 13, 0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  z-index: 9999;
  cursor: zoom-out;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}
.lightbox.is-open {
  opacity: 1;
  pointer-events: auto;
}
.lightbox__img {
  max-width: min(95vw, 1600px);
  max-height: 92vh;
  width: auto;
  height: auto;
  border-radius: 6px;
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.5);
  transform: scale(0.96);
  transition: transform 0.25s ease;
}
.lightbox.is-open .lightbox__img { transform: scale(1); }
.lightbox__close {
  position: absolute;
  top: 1rem;
  right: 1.25rem;
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 0;
  color: var(--bg);
  font-size: 1.75rem;
  line-height: 1;
  cursor: pointer;
  border-radius: 999px;
  transition: background var(--t);
}
.lightbox__close:hover { background: rgba(255, 255, 255, 0.1); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}