/* OCULINE — a warm dark boutique design for an eyewear range.
   A deep espresso ground with cream text, thin gold rules and wide-tracked uppercase headings.
   Distinct from the cool dark machining family, and from the four light designs.

   The shared motion layer makes the sticky header take the body's background colour, so the
   masthead is designed as part of the body surface: the same colours apply whether or not the
   script runs. */

:root {
  color-scheme: dark;
  --ground: #17130f;
  --surface: #1f1a15;
  --surface-2: #262019;
  --ink: #f2ece2;
  --ink-2: #bdb2a2;
  --ink-3: #8a8072;
  --rule: #3a3229;
  --accent: #c9a15a;
  --accent-ink: #17130f;
  --sans: "Helvetica Neue", Helvetica, Arial, system-ui, sans-serif;
  --shell: 1130px;
}

*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover, a:focus-visible { text-decoration: underline; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.shell { width: min(100% - 2.4rem, var(--shell)); margin-inline: auto; }

/* ---------------------------------------------------------------- masthead */

.masthead { background: var(--ground); color: var(--ink); border-bottom: 1px solid var(--accent); }
.masthead-inner { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem 2rem; padding: 1.1rem 0; }
.brand { display: flex; align-items: baseline; gap: 0.75rem; margin: 0; }
.brand strong { font-size: 1.16rem; font-weight: 400; letter-spacing: 0.34em; text-transform: uppercase; color: var(--ink); }
.brand span { font-size: 0.66rem; letter-spacing: 0.24em; text-transform: uppercase; color: var(--ink-3); }

.site-nav { display: flex; flex-wrap: wrap; gap: 0.3rem 1.25rem; margin-inline-start: auto; }
.site-nav a { color: var(--ink-2); font-size: 0.78rem; font-weight: 400; letter-spacing: 0.13em; text-transform: uppercase; padding: 0.25rem 0; border-bottom: 1px solid transparent; }
.site-nav a:hover { color: var(--ink); text-decoration: none; border-bottom-color: var(--rule); }
.site-nav a[aria-current="page"] { color: var(--accent); border-bottom-color: var(--accent); }

/* ---------------------------------------------------------------- headings */

h1, h2, h3 { font-weight: 400; line-height: 1.14; margin: 0 0 0.7rem; }
h1 { font-size: clamp(1.8rem, 1.1rem + 2.7vw, 3rem); letter-spacing: 0.05em; text-transform: uppercase; }
h2 { font-size: clamp(1.2rem, 0.98rem + 1.1vw, 1.6rem); letter-spacing: 0.07em; text-transform: uppercase; }
h3 { font-size: 1rem; letter-spacing: 0.04em; }

p { margin: 0 0 1rem; color: var(--ink-2); }
p.lead { font-size: 1.06rem; color: var(--ink); max-width: 58ch; }

.eyebrow { font-size: 0.68rem; letter-spacing: 0.28em; text-transform: uppercase; color: var(--accent); margin: 0 0 0.8rem; }

.breadcrumb { font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-3); margin: 0 0 1.2rem; }
.breadcrumb a { color: var(--ink-3); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { margin-inline: 0.45rem; }

/* ---------------------------------------------------------------- sections */

.section { padding: clamp(2.3rem, 1.4rem + 3vw, 3.8rem) 0; }
.section + .section { border-top: 1px solid var(--rule); }
.section-head { max-width: 60ch; margin-bottom: 1.7rem; }
.section-head.spaced { margin-top: 2.3rem; }

.hero { padding: clamp(2.4rem, 1.5rem + 3.6vw, 4.3rem) 0 clamp(1.7rem, 1rem + 2vw, 2.6rem); }
.hero-grid { display: grid; gap: clamp(1.5rem, 1rem + 2vw, 3rem); grid-template-columns: minmax(0, 1fr); }
@media (min-width: 940px) { .hero-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); align-items: center; } }

.hero-figure { margin: 0; background: var(--surface); border: 1px solid var(--rule); }
.hero-figure img { width: 100%; }
.hero-figure figcaption { font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-3); padding: 0.7rem 1rem; border-top: 1px solid var(--rule); }

/* ---------------------------------------------------------------- grids */

.grid { display: grid; gap: 1.3rem; grid-template-columns: repeat(auto-fit, minmax(min(100%, 255px), 1fr)); }
.grid.two { grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); }

.card { background: var(--surface); border: 1px solid var(--rule); padding: 1.3rem 1.35rem 1.5rem; display: flex; flex-direction: column; gap: 0.5rem; }
.card h3 { margin: 0; }
.card p { margin: 0; font-size: 0.93rem; }
.card .tag { font-size: 0.65rem; letter-spacing: 0.22em; text-transform: uppercase; color: var(--accent); }
.card a.more { font-size: 0.75rem; letter-spacing: 0.14em; text-transform: uppercase; margin-top: auto; }

.product-card { background: var(--surface); border: 1px solid var(--rule); display: flex; flex-direction: column; }
.product-card img { border-bottom: 1px solid var(--rule); }
.product-card .body { padding: 1.1rem 1.25rem 1.4rem; display: flex; flex-direction: column; gap: 0.45rem; }
.product-card h3 { margin: 0; }
.product-card .body p { margin: 0; font-size: 0.92rem; }
.product-card .body a.more { margin-top: 0.5rem; font-size: 0.75rem; letter-spacing: 0.14em; text-transform: uppercase; }

/* ---------------------------------------------------------------- data */

.spec-list { margin: 0 0 1.4rem; }
.spec-list > div { padding: 0.85rem 0; border-bottom: 1px solid var(--rule); display: grid; gap: 0.25rem 1.5rem; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 720px) { .spec-list > div { grid-template-columns: minmax(0, 13rem) minmax(0, 1fr); } }
.spec-list dt { font-size: 0.68rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--accent); margin: 0; }
.spec-list dd { margin: 0; color: var(--ink); font-size: 0.95rem; }

.table-scroll { overflow-x: auto; margin: 0 0 1.4rem; border: 1px solid var(--rule); background: var(--surface); }
table { border-collapse: collapse; width: 100%; min-width: 32rem; }
caption { text-align: left; font-size: 0.66rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--ink-3); padding: 0.8rem 1rem; border-bottom: 1px solid var(--rule); }
th, td { text-align: left; padding: 0.75rem 1rem; border-bottom: 1px solid var(--rule); font-size: 0.92rem; }
thead th { font-size: 0.66rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-3); font-weight: 400; }
tbody th { color: var(--ink); font-weight: 400; }
tbody td { color: var(--ink-2); }
tbody tr:last-child th, tbody tr:last-child td { border-bottom: 0; }

/* ---------------------------------------------------------------- notes */

details { background: var(--surface); border: 1px solid var(--rule); padding: 1rem 1.2rem; margin: 0 0 0.8rem; }
summary { cursor: pointer; font-size: 0.92rem; letter-spacing: 0.04em; color: var(--ink); }
summary::marker { color: var(--accent); }
details p { margin: 0.7rem 0 0; font-size: 0.93rem; }

.note { font-size: 0.84rem; color: var(--ink-2); border-left: 2px solid var(--accent); padding: 0.35rem 0 0.35rem 1rem; margin: 0 0 1.4rem; }

.demo-band { background: var(--surface-2); border: 1px solid var(--rule); padding: 0.8rem 1.1rem; font-size: 0.78rem; letter-spacing: 0.06em; color: var(--ink-2); margin: 0 0 1.5rem; }
.demo-band strong { color: var(--accent); letter-spacing: 0.14em; }

/* ---------------------------------------------------------------- links */

.link-row { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-top: 1.4rem; }
.link-row a { font-size: 0.75rem; letter-spacing: 0.16em; text-transform: uppercase; border: 1px solid var(--rule); padding: 0.65rem 1.2rem; color: var(--ink); background: transparent; }
.link-row a:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.link-row a.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.link-row a.primary:hover { background: #dcb672; border-color: #dcb672; color: var(--accent-ink); }

.next-links { display: grid; gap: 0.8rem; grid-template-columns: repeat(auto-fit, minmax(min(100%, 245px), 1fr)); margin-top: 1.4rem; }
.next-links a { background: var(--surface); border: 1px solid var(--rule); padding: 0.95rem 1.1rem; display: flex; flex-direction: column; gap: 0.25rem; }
.next-links a span { font-size: 0.65rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--ink-3); }
.next-links a b { font-weight: 400; font-size: 0.98rem; letter-spacing: 0.04em; color: var(--ink); }
.next-links a:hover { border-color: var(--accent); text-decoration: none; }
.next-links a:hover b { color: var(--accent); }

/* ---------------------------------------------------------------- footer */

.site-foot { border-top: 1px solid var(--rule); background: var(--surface-2); margin-top: 2.3rem; padding: 1.9rem 0 3rem; }
.site-foot p { font-size: 0.84rem; color: var(--ink-3); }
.site-foot .links { display: flex; flex-wrap: wrap; gap: 0.5rem 1.4rem; margin-bottom: 1rem; }
.site-foot .links a { font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-2); }

/* ---------------------------------------------------------------- utilities */

.visually-hidden { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.skip { position: absolute; left: -9999px; top: 0; background: var(--accent); color: var(--accent-ink); padding: 0.7rem 1.1rem; z-index: 40; letter-spacing: 0.12em; text-transform: uppercase; font-size: 0.75rem; }
.skip:focus { left: 0.5rem; top: 0.5rem; }
main:focus { outline: none; }