/* retinaoct.com — placeholder landing page */

:root {
  --bg:            #fbfaf8;
  --bg-elev:       #ffffff;
  --bg-sunken:     #f3f1ed;
  --text:          #16181d;
  --text-muted:    #5b6270;
  --text-faint:    #8b929e;
  --border:        #e3e0da;
  --border-strong: #cfcbc2;
  --accent:        #b4530a;
  --accent-soft:   #fdf2e6;
  --accent-text:   #8f4208;
  --radius:        10px;
  --maxw:          64rem;
  --font: ui-sans-serif, -apple-system, "SF Pro Text", "Segoe UI", Inter,
          system-ui, sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:            #0e1013;
    --bg-elev:       #16191e;
    --bg-sunken:     #121418;
    --text:          #eceef2;
    --text-muted:    #9aa2b0;
    --text-faint:    #6b7382;
    --border:        #262b33;
    --border-strong: #363c46;
    --accent:        #f0913d;
    --accent-soft:   #241a11;
    --accent-text:   #f4a55e;
  }
}
:root[data-theme="dark"] {
  --bg:            #0e1013;
  --bg-elev:       #16191e;
  --bg-sunken:     #121418;
  --text:          #eceef2;
  --text-muted:    #9aa2b0;
  --text-faint:    #6b7382;
  --border:        #262b33;
  --border-strong: #363c46;
  --accent:        #f0913d;
  --accent-soft:   #241a11;
  --accent-text:   #f4a55e;
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.wrap {
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 24px;
}

/* ── header ─────────────────────────────────────────── */

header {
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(160%) blur(10px);
}

.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  letter-spacing: -0.015em;
  font-size: 1.0625rem;
}

.brand svg { display: block; flex: none; }

.tag {
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-text);
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 24%, transparent);
  padding: 3px 9px;
  border-radius: 999px;
  white-space: nowrap;
}

/* ── hero ───────────────────────────────────────────── */

.hero { padding-block: clamp(48px, 9vw, 96px) clamp(32px, 5vw, 56px); }

h1 {
  margin: 0 0 20px;
  font-size: clamp(2rem, 6.2vw, 3.5rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  font-weight: 640;
  max-width: 19ch;
}

.lede {
  margin: 0;
  font-size: clamp(1.0625rem, 2.4vw, 1.25rem);
  line-height: 1.55;
  color: var(--text-muted);
  max-width: 54ch;
}

/* ── OCT scan motif ─────────────────────────────────── */

.scan {
  margin-block: clamp(36px, 6vw, 60px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-sunken);
  overflow: hidden;
  position: relative;
}

.scan svg { display: block; width: 100%; height: auto; }

.scan figcaption {
  position: absolute;
  left: 14px;
  bottom: 12px;
  font-family: var(--mono);
  font-size: 0.6875rem;
  color: var(--text-faint);
  letter-spacing: 0.03em;
}

/* ── feature cards ──────────────────────────────────── */

.grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr));
  padding-bottom: clamp(40px, 7vw, 72px);
}

.card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.card h2 {
  margin: 0;
  font-size: 1rem;
  font-weight: 620;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 9px;
}

.card h2 svg { color: var(--accent); flex: none; }

.card p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.55;
}

.soon {
  margin-top: auto;
  padding-top: 12px;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-faint);
  display: flex;
  align-items: center;
  gap: 7px;
}

.dot {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--accent);
  flex: none;
}

/* ── preview search (non-functional) ────────────────── */

.preview {
  border-top: 1px solid var(--border);
  padding-block: clamp(40px, 7vw, 64px);
}

.preview h2 {
  margin: 0 0 6px;
  font-size: 1.0625rem;
  font-weight: 620;
  letter-spacing: -0.012em;
}

.preview > p {
  margin: 0 0 22px;
  color: var(--text-muted);
  font-size: 0.9375rem;
  max-width: 56ch;
}

.mock {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev);
  overflow: hidden;
}

.mock-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 15px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-sunken);
  color: var(--text-faint);
  font-size: 0.9375rem;
}

.mock-bar svg { flex: none; }

.mock-body {
  display: grid;
  gap: 1px;
  background: var(--border);
}

.row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
  padding: 13px 15px;
  background: var(--bg-elev);
  font-size: 0.875rem;
}

.row-id {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--text-faint);
}

.chip {
  font-family: var(--mono);
  font-size: 0.6875rem;
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  color: var(--text-muted);
  white-space: nowrap;
}

.skel {
  height: 9px;
  border-radius: 3px;
  background: linear-gradient(
    90deg,
    var(--bg-sunken) 0%,
    color-mix(in srgb, var(--border) 70%, transparent) 50%,
    var(--bg-sunken) 100%
  );
  background-size: 200% 100%;
  animation: shim 2.4s ease-in-out infinite;
}
.skel.w70 { width: 70%; }
.skel.w52 { width: 52%; }
.skel.w61 { width: 61%; }

@keyframes shim {
  0%   { background-position: 140% 0; }
  100% { background-position: -40% 0; }
}

@media (prefers-reduced-motion: reduce) {
  .skel { animation: none; }
  .sweep { display: none; }
}

/* ── footer ─────────────────────────────────────────── */

footer {
  border-top: 1px solid var(--border);
  padding-block: 28px 40px;
  color: var(--text-faint);
  font-size: 0.8125rem;
}

.note {
  margin: 0 0 14px;
  padding: 13px 15px;
  border-left: 2px solid color-mix(in srgb, var(--accent) 45%, transparent);
  background: var(--accent-soft);
  color: var(--text-muted);
  border-radius: 0 6px 6px 0;
  font-size: 0.8125rem;
  line-height: 1.55;
  max-width: 68ch;
}

.foot-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  align-items: center;
  justify-content: space-between;
}

footer a { color: var(--text-muted); text-decoration: none; }
footer a:hover { color: var(--text); text-decoration: underline; }