/* =========================================================================
   natureimages.space — skin "grid"

   Bright, systematic and fast. Everything sits on a visible 8px rhythm, edges
   are hard, corners are square and the only motion is a 120ms state change.
   The signature is a hairline grid that the layout actually uses: cards butt
   against each other with shared 1px rules instead of floating in gaps.

   HAND-MAINTAINED. The forge never overwrites this file.
   ========================================================================= */

:root {
  --bg: #f5f7f6;
  --bg-deep: #eaeeec;
  --surface: #ffffff;
  --surface-2: #f9fbfa;
  --text: #16211c;
  --muted: #5d6c65;
  --indigo: #2f6f4e;
  --indigo-soft: #7fb069;
  --indigo-deep: #22543a;
  --glow: rgba(47, 111, 78, 0.12);
  --glow-soft: rgba(127, 176, 105, 0.14);
  --line: rgba(22, 33, 28, 0.13);
  --line-strong: rgba(22, 33, 28, 0.28);

  --r-sm: 0px;
  --r: 0px;
  --r-lg: 0px;

  --shadow-sm: none;
  --shadow: none;
  --shadow-lift: none;

  --grad-wash: none;
  --unit: 8px;
}

body.style-grid {
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* ---------- type: tight, systematic --------------------------------------- */

body.style-grid h1,
body.style-grid h2,
body.style-grid h3 {
  font-weight: 700;
  letter-spacing: -0.028em;
  line-height: 1.08;
}

body.style-grid h1 { font-size: clamp(2rem, 5.2vw, 4rem); }

body.style-grid .eyebrow {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: 0.66rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--indigo);
}

body.style-grid .lede,
body.style-grid .hero-lead {
  color: var(--muted);
  font-size: clamp(1rem, 1.35vw, 1.15rem);
  max-width: 58ch;
}

/* ---------- header: a hard rule, no blur ---------------------------------- */

body.style-grid .site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line-strong);
  backdrop-filter: none;
}

body.style-grid .brand-name { font-weight: 700; letter-spacing: -0.03em; }
body.style-grid .brand-name em { font-style: normal; color: var(--indigo); }
body.style-grid .brand-dot { background: var(--indigo); border-radius: 0; }

body.style-grid .site-nav a {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--muted);
  padding: 4px 6px;
  transition: background-color 0.12s linear, color 0.12s linear;
}

body.style-grid .site-nav a:hover {
  background: var(--indigo);
  color: #fff;
}

body.style-grid .header-search input,
body.style-grid .hero-search input {
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: 0;
  color: var(--text);
}

body.style-grid .header-search button,
body.style-grid .hero-search button {
  background: var(--indigo);
  color: #fff;
  border: 1px solid var(--indigo);
  border-radius: 0;
  font-weight: 600;
}

/* ---------- hero: graph paper --------------------------------------------- */

body.style-grid .hero {
  background:
    repeating-linear-gradient(0deg, var(--line) 0 1px, transparent 1px calc(var(--unit) * 6)),
    repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px calc(var(--unit) * 6)),
    var(--bg);
  padding-block: clamp(4rem, 10vw, 7.5rem);
  border-bottom: 1px solid var(--line-strong);
}

body.style-grid .hero::before,
body.style-grid .hero::after { display: none; }

/* ---------- buttons: solid rectangles ------------------------------------- */

body.style-grid .btn {
  border-radius: 0;
  font-weight: 600;
  font-size: 0.86rem;
  padding: 0.8rem 1.4rem;
  box-shadow: none;
  transition: background-color 0.12s linear, color 0.12s linear, border-color 0.12s linear;
}

body.style-grid .btn-primary {
  background: var(--indigo);
  color: #fff;
  border: 1px solid var(--indigo);
}

body.style-grid .btn-primary:hover { background: var(--indigo-deep); border-color: var(--indigo-deep); }

body.style-grid .btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line-strong);
}

body.style-grid .btn-ghost:hover { border-color: var(--indigo); color: var(--indigo); }

/* ---------- cards: a shared 1px grid, not floating tiles ------------------ */

body.style-grid .grid {
  gap: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  background: var(--surface);
}

body.style-grid .card {
  background: var(--surface);
  border: 0;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  padding: calc(var(--unit) * 1.5);
  transition: background-color 0.12s linear;
}

body.style-grid .card:hover { background: var(--surface-2); }

body.style-grid .card-media {
  position: relative;
  outline: 1px solid transparent;
  outline-offset: -1px;
  transition: outline-color 0.12s linear;
}

body.style-grid .card:hover .card-media { outline-color: var(--indigo); }

body.style-grid .card img { border-radius: 0; }

body.style-grid .card-badge {
  background: var(--text);
  color: #fff;
  border-radius: 0;
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  padding: 2px 6px;
}

body.style-grid .card-price {
  position: absolute;
  right: 0;
  bottom: 0;
  background: var(--indigo);
  color: #fff;
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 7px;
}

body.style-grid .card-body { padding: calc(var(--unit) * 1.25) 0 0; }

body.style-grid .card-title { font-size: 0.94rem; font-weight: 600; letter-spacing: -0.01em; }
body.style-grid .card-title a { color: var(--text); }
body.style-grid .card-title a:hover { color: var(--indigo); }

body.style-grid .card-download {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: 0.7rem;
  color: var(--muted);
  background: none;
  border: 0;
  padding: 0;
}

/* ---------- chips: square, monospaced ------------------------------------- */

body.style-grid .tag-chips a,
body.style-grid .tag-index a {
  background: var(--bg-deep);
  border: 1px solid transparent;
  border-radius: 0;
  color: var(--muted);
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: 0.7rem;
  padding: 2px 7px;
}

body.style-grid .tag-chips a:hover,
body.style-grid .tag-index a:hover { border-color: var(--indigo); color: var(--indigo); }

/* ---------- detail + purchase --------------------------------------------- */

body.style-grid .detail-frame {
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: 0;
  padding: var(--unit);
}

body.style-grid .specs {
  border-top: 1px solid var(--line-strong);
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: 0.82rem;
}

body.style-grid .specs > div {
  border-bottom: 1px solid var(--line);
  padding-block: 0.55rem;
}

body.style-grid .specs dt {
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

body.style-grid .purchase {
  border: 1px solid var(--line-strong);
  border-left: 4px solid var(--indigo);
  padding: 1.4rem;
  margin-block: 1.4rem;
  background: var(--surface);
}

body.style-grid .purchase-price { display: flex; align-items: baseline; gap: 0.5rem; margin: 0 0 0.9rem; }

body.style-grid .purchase-amount {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: clamp(2.2rem, 4.4vw, 3rem);
  font-weight: 400;
  line-height: 1;
  color: var(--indigo);
}

body.style-grid .purchase-unit {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

body.style-grid .purchase-note { font-size: 0.84rem; color: var(--muted); }

body.style-grid .purchase-benefits { list-style: none; margin: 0.9rem 0 0; padding: 0; }

body.style-grid .purchase-benefits li {
  border-top: 1px solid var(--line);
  padding: 0.45rem 0 0.45rem 1.1rem;
  font-size: 0.86rem;
  position: relative;
}

body.style-grid .purchase-benefits li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.95rem;
  width: 5px;
  height: 5px;
  background: var(--indigo-soft);
}

body.style-grid .paypal-modal {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--line-strong);
  border-radius: 0;
  padding: 0;
  max-width: 29rem;
}

body.style-grid .paypal-modal::backdrop { background: rgba(22, 33, 28, 0.45); }
body.style-grid .paypal-modal-card { padding: 1.8rem; }
body.style-grid .paypal-modal-price {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: 2rem;
  color: var(--indigo);
}

/* ---------- collections and journal --------------------------------------- */

body.style-grid .collection-strip,
body.style-grid .journal-teasers {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

body.style-grid .collection-strip li,
body.style-grid .journal-teaser {
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

body.style-grid .collection-strip a {
  display: block;
  padding: calc(var(--unit) * 2.5);
  color: var(--text);
  background: var(--surface);
  transition: background-color 0.12s linear;
}

body.style-grid .collection-strip a:hover { background: var(--indigo); color: #fff; }
body.style-grid .collection-strip a:hover .collection-price,
body.style-grid .collection-strip a:hover .collection-count { color: #fff; }

body.style-grid .collection-name { display: block; font-weight: 600; }
body.style-grid .collection-price {
  display: block;
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: 1.6rem;
  color: var(--indigo);
  margin-top: 0.2rem;
}
body.style-grid .collection-count { display: block; font-size: 0.76rem; color: var(--muted); }

body.style-grid .journal-teaser article { padding: calc(var(--unit) * 2.5); background: var(--surface); }

body.style-grid .journal-date {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--indigo);
  margin: 0 0 0.4rem;
}

body.style-grid .journal-teaser h3,
body.style-grid .journal-item h2 { font-size: 1.15rem; font-weight: 600; margin: 0 0 0.4rem; }
body.style-grid .journal-teaser h3 a,
body.style-grid .journal-item h2 a { color: var(--text); }
body.style-grid .journal-teaser h3 a:hover,
body.style-grid .journal-item h2 a:hover { color: var(--indigo); }

body.style-grid .journal-list { list-style: none; padding: 0; margin: 0; max-width: 46rem; }
body.style-grid .journal-item article { border-bottom: 1px solid var(--line); padding-block: 1.5rem; }
body.style-grid .journal-article { max-width: 40rem; margin-inline: auto; }
body.style-grid .journal-article h2 { font-size: 1.3rem; margin-top: 2rem; }

body.style-grid .journal-cta,
body.style-grid .journal-siblings {
  max-width: 40rem;
  margin: 2.2rem auto 0;
  border-top: 1px solid var(--line-strong);
  padding-top: 1.1rem;
}

body.style-grid .journal-siblings ul { list-style: none; padding: 0; margin: 0; }

/* ---------- sitemap: dense by design -------------------------------------- */

body.style-grid .sitemap-grid {
  display: grid;
  gap: calc(var(--unit) * 3);
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
}

body.style-grid .sitemap-col-wide { grid-column: 1 / -1; }

body.style-grid .sitemap-col h2 {
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--indigo);
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 0.4rem;
}

body.style-grid .sitemap-col ul { list-style: none; padding: 0; margin: 0.6rem 0 0; }
body.style-grid .sitemap-col-wide ul { columns: 4 12rem; column-gap: calc(var(--unit) * 3); }
body.style-grid .sitemap-col li { padding-block: 0.15rem; font-size: 0.86rem; break-inside: avoid; }

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

body.style-grid .site-footer {
  background: var(--surface);
  border-top: 1px solid var(--line-strong);
  color: var(--muted);
}

body.style-grid .footer-cols span {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
  font-size: 0.64rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text);
}

body.style-grid .footer-cols a { color: var(--muted); font-size: 0.88rem; }
body.style-grid .footer-cols a:hover { color: var(--indigo); }
body.style-grid .footer-base { border-top: 1px solid var(--line); font-size: 0.78rem; }