/* ============================================================
   DepthWeaver — design system
   Editorial dark canvas. Ink + bone + vermillion.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=Fraunces:opsz,wght,SOFT@9..144,300..700,0..100&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  /* palette */
  --ink:           #0B0E14;
  --ink-soft:      #10141C;
  --surface:       #13171F;
  --surface-2:     #1B202B;
  --bone:          #EAE5D6;
  --bone-muted:    #8E8878;
  --bone-faint:    #4A4538;
  --vermillion:    #FF4D2E;
  --vermillion-hi: #FF7A5C;

  --rule:          rgba(234, 229, 214, 0.08);
  --rule-strong:   rgba(234, 229, 214, 0.18);

  /* type */
  --font-display:  'Instrument Serif', 'Times New Roman', Georgia, serif;
  --font-body:     'Fraunces', Georgia, 'Times New Roman', serif;
  --font-mono:     'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;

  --fs-display:    clamp(3.25rem, 9vw, 7.5rem);
  --fs-h1:         clamp(2rem, 4.6vw, 3.25rem);
  --fs-h2:         clamp(1.5rem, 2.6vw, 2rem);
  --fs-h3:         1.25rem;
  --fs-body:       1.0625rem;
  --fs-small:      0.9375rem;
  --fs-label:      0.7rem;

  /* spacing */
  --s-1: 0.25rem;
  --s-2: 0.5rem;
  --s-3: 0.75rem;
  --s-4: 1rem;
  --s-5: 1.5rem;
  --s-6: 2rem;
  --s-7: 2.5rem;
  --s-8: 3rem;
  --s-10: 4.5rem;
  --s-12: 6rem;
  --s-16: 9rem;

  /* layout */
  --content-width: 38rem;
  --wide-width:    66rem;

  color-scheme: dark;
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
img, svg, canvas { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; padding: 0; }
a { color: inherit; }

/* ---------- base ---------- */
html {
  background: var(--ink);
  color: var(--bone);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.55;
  font-feature-settings: "ss01", "ss02";
  font-variation-settings: "opsz" 14, "SOFT" 30;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(255, 77, 46, 0.08), transparent 60%),
    var(--ink);
}

::selection {
  background: var(--vermillion);
  color: var(--ink);
}

/* ---------- typography ---------- */
.display {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 0.92;
  letter-spacing: -0.02em;
  font-size: var(--fs-display);
}
.display em {
  font-style: italic;
  color: var(--vermillion);
  font-feature-settings: "ss01";
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.015em;
  margin: 0 0 var(--s-4);
}
h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); margin-top: var(--s-10); }
h3 {
  font-size: var(--fs-h3);
  font-family: var(--font-body);
  font-variation-settings: "opsz" 14, "wght" 600, "SOFT" 0;
  letter-spacing: -0.005em;
  margin-top: var(--s-6);
  margin-bottom: var(--s-2);
}

p {
  margin: 0 0 var(--s-4);
  max-width: 38rem;
  font-variation-settings: "opsz" 14, "wght" 380, "SOFT" 30;
}
p.lead {
  font-size: 1.25rem;
  color: var(--bone);
  font-variation-settings: "opsz" 18, "wght" 360, "SOFT" 50;
  max-width: 36rem;
}

ul, ol { padding-left: 1.25em; margin: 0 0 var(--s-5); }
li { margin-bottom: var(--s-2); }
li::marker { color: var(--vermillion); }

a {
  color: var(--bone);
  text-decoration: underline;
  text-decoration-color: var(--bone-faint);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  transition: text-decoration-color 160ms ease, color 160ms ease;
}
a:hover {
  color: var(--vermillion);
  text-decoration-color: var(--vermillion);
}

code, kbd {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--surface);
  padding: 0.1em 0.35em;
  border-radius: 3px;
  color: var(--bone);
}

hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: var(--s-10) 0;
}

/* ---------- shared eyebrow / label ---------- */
.label {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--bone-muted);
  font-weight: 500;
}
.label-accent { color: var(--vermillion); }

/* ---------- layout ---------- */
.container {
  width: 100%;
  max-width: var(--wide-width);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 2.5rem);
}
.container-narrow {
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 2.5rem);
}

main { flex: 1 0 auto; }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(11, 14, 20, 0.78);
  backdrop-filter: saturate(140%) blur(8px);
  -webkit-backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--rule);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--s-3);
}
.wordmark {
  font-family: var(--font-display);
  font-size: 1.45rem;
  letter-spacing: -0.01em;
  text-decoration: none;
  display: inline-flex;
  align-items: baseline;
  gap: 0.35rem;
  color: var(--bone);
}
.wordmark__dot {
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: var(--vermillion);
  display: inline-block;
  transform: translateY(-0.05em);
}
.wordmark:hover { color: var(--bone); }

.site-nav {
  display: flex;
  gap: var(--s-5);
  align-items: center;
}
.site-nav a {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--bone-muted);
  font-weight: 500;
}
.site-nav a:hover { color: var(--bone); }
.site-nav a[aria-current="page"] {
  color: var(--bone);
  border-bottom: 1px solid var(--vermillion);
  padding-bottom: 2px;
}

/* ---------- hero ---------- */
.hero {
  padding-top: var(--s-12);
  padding-bottom: var(--s-12);
  position: relative;
}
.hero__head {
  max-width: 44rem;
}
.hero__head .label {
  display: inline-flex;
  gap: 0.6em;
  align-items: center;
  margin-bottom: var(--s-5);
}
.hero__head .label::before {
  content: "";
  width: 1.6rem;
  height: 1px;
  background: var(--vermillion);
  display: inline-block;
}
.hero__sub {
  margin-top: var(--s-6);
  max-width: 32rem;
}
.hero__meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, max-content);
  gap: var(--s-6);
  margin-top: var(--s-7);
  padding-top: var(--s-5);
  border-top: 1px solid var(--rule-strong);
  max-width: max-content;
}
.hero__meta dt {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--bone-muted);
  margin-bottom: var(--s-1);
}
.hero__meta dd {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.5rem;
}

/* ---------- section heading ---------- */
.section {
  padding-block: var(--s-12);
  border-top: 1px solid var(--rule);
}
.section__head {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: var(--s-6);
  align-items: baseline;
  margin-bottom: var(--s-8);
}
.section__num {
  font-family: var(--font-mono);
  color: var(--vermillion);
  font-size: var(--fs-label);
  letter-spacing: 0.18em;
}
.section__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.4vw, 2.5rem);
  margin: 0;
  line-height: 1;
}

/* ---------- features grid ---------- */
.features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border-top: 1px solid var(--rule);
}
@media (max-width: 720px) {
  .features { grid-template-columns: 1fr; }
}
.feature {
  padding: var(--s-7) var(--s-6);
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.feature:nth-child(2n) { border-right: 0; }
@media (max-width: 720px) {
  .feature { border-right: 0; }
}
.feature__num {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.18em;
  color: var(--bone-muted);
  margin-bottom: var(--s-4);
}
.feature__title {
  font-family: var(--font-display);
  font-size: 1.6rem;
  line-height: 1.05;
  margin: 0 0 var(--s-3);
}
.feature p { color: var(--bone-muted); margin: 0; font-size: var(--fs-small); }

/* ---------- privacy callout ---------- */
.callout {
  padding: var(--s-8);
  border: 1px solid var(--rule-strong);
  background:
    linear-gradient(135deg, rgba(255, 77, 46, 0.04), transparent 70%),
    var(--ink-soft);
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: var(--s-6);
  align-items: center;
}
@media (max-width: 600px) {
  .callout { grid-template-columns: 1fr; gap: var(--s-4); }
}
.callout__mark {
  font-family: var(--font-display);
  font-size: 4rem;
  line-height: 0.9;
  color: var(--vermillion);
}
.callout p { margin: 0; max-width: 32rem; }

/* ---------- CTA ---------- */
.cta-row { display: flex; gap: var(--s-4); flex-wrap: wrap; margin-top: var(--s-6); }
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  padding: var(--s-3) var(--s-5);
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  text-decoration: none;
  font-weight: 500;
  border: 1px solid var(--rule-strong);
  color: var(--bone);
  transition: all 160ms ease;
}
.btn:hover { border-color: var(--vermillion); color: var(--vermillion); }
.btn--primary {
  background: var(--bone);
  color: var(--ink);
  border-color: var(--bone);
}
.btn--primary:hover { background: var(--vermillion); border-color: var(--vermillion); color: var(--ink); }

.btn__hint {
  color: var(--bone-faint);
  letter-spacing: 0.1em;
  font-size: 0.65rem;
}

/* ---------- prose pages ---------- */
.prose {
  padding-block: var(--s-10) var(--s-12);
}
.prose__header {
  margin-bottom: var(--s-10);
  padding-bottom: var(--s-6);
  border-bottom: 1px solid var(--rule);
}
.prose__header .label { display: block; margin-bottom: var(--s-3); }
.prose__header h1 { font-family: var(--font-display); font-size: clamp(2.5rem, 6vw, 4rem); margin: 0; }
.prose__header .meta {
  margin-top: var(--s-4);
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--bone-muted);
}
.prose section + section { margin-top: var(--s-8); }
.prose h2 {
  font-size: 1.625rem;
  margin-top: var(--s-10);
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: var(--s-4);
  align-items: baseline;
}
.prose h2::before {
  content: attr(data-num);
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.18em;
  color: var(--vermillion);
  font-weight: 500;
  transform: translateY(-0.2em);
}

/* FAQ */
.faq details {
  border-bottom: 1px solid var(--rule);
  padding-block: var(--s-4);
}
.faq details:first-of-type { border-top: 1px solid var(--rule); }
.faq summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--s-4);
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--bone);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  font-family: var(--font-mono);
  color: var(--vermillion);
  transition: transform 200ms ease;
}
.faq details[open] summary::after { content: "−"; }
.faq details > p, .faq details > ul { margin-top: var(--s-3); color: var(--bone-muted); }

/* contact card */
.contact {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: var(--s-4) var(--s-6);
  padding: var(--s-6);
  border: 1px solid var(--rule-strong);
  margin-top: var(--s-8);
}
.contact dt {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--bone-muted);
}
.contact dd { margin: 0; font-family: var(--font-display); font-size: 1.25rem; }
.contact a { text-decoration-color: var(--vermillion); }

/* ---------- footer ---------- */
.site-footer {
  margin-top: var(--s-16);
  border-top: 1px solid var(--rule);
  padding-block: var(--s-8);
}
.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-6);
  justify-content: space-between;
  align-items: baseline;
}
.site-footer .wordmark { font-size: 1.15rem; }
.site-footer__nav {
  display: flex;
  gap: var(--s-5);
  flex-wrap: wrap;
}
.site-footer__nav a {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--bone-muted);
  text-decoration: none;
}
.site-footer__nav a:hover { color: var(--bone); }
.site-footer__meta {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--bone-faint);
  margin-top: var(--s-4);
  flex-basis: 100%;
}

/* ---------- accessibility ---------- */
:focus-visible {
  outline: 2px solid var(--vermillion);
  outline-offset: 3px;
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}