/* ============================================================================
   XN Systems — Editorial Engineering Review
   Typography-first, single-column editorial with asymmetric grids.
   Fraunces for body + display voice (opsz variable), DM Serif for the XN mark,
   JetBrains Mono only for the XN-OS signal. Warm paper, warm ink, one blue.
   ============================================================================ */

:root {
  /* Warm monochrome. Never pure white, never pure black. */
  --paper:    #FAF8F3;
  --paper-2:  #F1EDE4;
  --ink-1:    #141311;
  --ink-2:    #2A2724;
  --ink-3:    #55504A;
  --ink-4:    #8A8379;
  --ink-5:    #BDB6A9;
  --rule:     #141311;

  /* Single accent. CANTERA blue carried forward for brand continuity. */
  --accent:   #1E40AF;
  --accent-2: #16308C;

  /* Type */
  --serif:    'Fraunces', 'Caslon', 'Times New Roman', serif;
  --display:  'DM Serif Display', 'Fraunces', serif;
  --mono:     'JetBrains Mono', ui-monospace, monospace;

  /* Grid & rhythm */
  --col-max:  1240px;
  --gutter-lg: 72px;
  --gutter-md: 44px;
  --gutter-sm: 24px;
  --baseline: 8px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scrollbar-gutter: stable; }
html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink-1);
  font-family: var(--serif);
  font-feature-settings: "ss01", "ss02", "liga", "kern", "onum";
  font-variation-settings: "opsz" 14, "wght" 380;
  font-size: 18px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    radial-gradient(rgba(20,19,17,0.025) 1px, transparent 1px),
    radial-gradient(rgba(20,19,17,0.018) 1px, transparent 1px);
  background-size: 3px 3px, 7px 7px;
  background-position: 0 0, 1px 2px;
}
main, header, footer, section, hr { position: relative; z-index: 1; }

a { color: inherit; text-decoration: none; }
::selection { background: var(--accent); color: var(--paper); }

/* Rules */
.rule { border: 0; border-top: 1px solid var(--rule); margin: 0; height: 1px; }
.rule-heavy { border-top-width: 3px; }

/* Masthead */
.masthead {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: baseline;
  padding: 22px var(--gutter-lg) 18px;
  gap: 32px;
  font-variation-settings: "opsz" 10, "wght" 420;
}
.masthead-l {
  justify-self: start;
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--display);
  font-size: 30px;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--ink-1);
}
.mk-xn { font-weight: 400; }
.mk-sys {
  font-family: var(--serif);
  font-variation-settings: "opsz" 144, "wght" 500;
  font-size: 16px;
  font-style: italic;
  color: var(--ink-3);
  letter-spacing: 0.01em;
  transform: translateY(-3px);
}
.masthead-c {
  justify-self: center;
  font-family: var(--serif);
  font-variation-settings: "opsz" 9, "wght" 380;
  font-style: italic;
  font-size: 13px;
  color: var(--ink-3);
  white-space: nowrap;
}
.masthead-r {
  justify-self: end;
  display: flex;
  align-items: baseline;
  gap: 26px;
  font-size: 14px;
  font-variation-settings: "opsz" 10, "wght" 500;
}
.masthead-r a {
  color: var(--ink-2);
  position: relative;
  padding-bottom: 2px;
}
.masthead-r a:not(.mh-cta)::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--ink-1);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}
.masthead-r a:hover::after { transform: scaleX(1); }
.mh-cta {
  background: var(--ink-1);
  color: var(--paper) !important;
  padding: 8px 14px;
  border-radius: 0;
  font-variation-settings: "opsz" 10, "wght" 500;
  font-style: italic;
  transition: background 0.15s ease;
}
.mh-cta:hover { background: var(--accent); }
@media (max-width: 960px) {
  .masthead { grid-template-columns: 1fr auto; padding: 18px var(--gutter-md) 14px; }
  .masthead-c { display: none; }
  .masthead-r { gap: 16px; font-size: 13px; }
  .masthead-r a:not(.mh-cta) { display: none; }
}

/* Scaffold */
.hero, .spread, .case, .xnos-note, .contact {
  max-width: var(--col-max);
  margin: 0 auto;
  padding: 72px var(--gutter-lg) 84px;
}
@media (max-width: 720px) {
  .hero, .spread, .case, .xnos-note, .contact {
    padding: 56px var(--gutter-sm) 64px;
  }
}

/* Kicker */
.kick {
  font-family: var(--serif);
  font-variation-settings: "opsz" 9, "wght" 500;
  font-style: italic;
  font-size: 13px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
  margin-bottom: 14px;
}

/* Drop-cap */
.drop {
  font-family: var(--display);
  float: left;
  font-size: 78px;
  line-height: 0.86;
  padding: 6px 10px 0 0;
  margin-top: 4px;
  color: var(--ink-1);
}

/* Hero */
.hero { padding-top: 96px; padding-bottom: 72px; }
@keyframes rise {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}
.hero-grid {
  display: grid;
  grid-template-columns: 3fr 8fr;
  gap: 56px;
  align-items: start;
}
.hero-meta {
  border-right: 1px solid var(--ink-5);
  padding-right: 44px;
  padding-top: 16px;
}
.dateline {
  font-family: var(--serif);
  font-variation-settings: "opsz" 72, "wght" 400;
  font-style: italic;
  font-size: 20px;
  line-height: 1.3;
  color: var(--ink-2);
}
.hero-head {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(56px, 9vw, 128px);
  line-height: 0.93;
  letter-spacing: -0.028em;
  color: var(--ink-1);
  margin: 0 0 36px;
}
.hero-head em {
  font-family: var(--serif);
  font-style: italic;
  font-variation-settings: "opsz" 144, "wght" 350;
  color: var(--accent);
  font-size: 0.95em;
}
.hh-line {
  display: block;
  opacity: 0;
  animation: rise 0.9s cubic-bezier(0.2, 0.7, 0.2, 1) forwards;
}
.hh-line:nth-child(1) { animation-delay: 0.05s; }
.hh-line:nth-child(2) { animation-delay: 0.18s; }
.hh-line:nth-child(3) { animation-delay: 0.31s; }

.hero-lede {
  font-family: var(--serif);
  font-variation-settings: "opsz" 18, "wght" 380;
  font-size: 20px;
  line-height: 1.55;
  color: var(--ink-2);
  max-width: 58ch;
  margin: 0 0 36px;
  opacity: 0;
  animation: rise 0.9s 0.48s cubic-bezier(0.2, 0.7, 0.2, 1) forwards;
}
.mk-xnos {
  font-family: var(--mono);
  font-size: 0.86em;
  font-weight: 500;
  color: var(--ink-1);
  padding: 1px 6px;
  border: 1px solid var(--ink-1);
  white-space: nowrap;
}

.hero-ctas {
  display: flex;
  align-items: baseline;
  gap: 32px;
  flex-wrap: wrap;
  opacity: 0;
  animation: rise 0.9s 0.6s cubic-bezier(0.2, 0.7, 0.2, 1) forwards;
}
.btn {
  display: inline-block;
  padding: 13px 24px;
  background: var(--ink-1);
  color: var(--paper);
  font-family: var(--serif);
  font-variation-settings: "opsz" 14, "wght" 500;
  font-style: italic;
  font-size: 17px;
  letter-spacing: 0.005em;
  border: 1px solid var(--ink-1);
  transition: background 0.2s ease, color 0.2s ease;
}
.btn:hover { background: var(--accent); border-color: var(--accent); }
.link-u {
  font-family: var(--serif);
  font-variation-settings: "opsz" 14, "wght" 400;
  font-style: italic;
  font-size: 16px;
  color: var(--ink-2);
  border-bottom: 1px solid var(--ink-3);
  padding-bottom: 2px;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.link-u:hover { color: var(--accent); border-color: var(--accent); }

.hero-foot {
  margin-top: 56px;
  padding-top: 20px;
  border-top: 1px solid var(--ink-5);
  display: grid;
  grid-template-columns: auto 32px 1fr;
  gap: 0;
  align-items: baseline;
}
.hf-k {
  font-family: var(--serif);
  font-variation-settings: "opsz" 9, "wght" 600;
  font-style: italic;
  font-size: 12.5px;
  color: var(--ink-3);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.hf-sep { height: 1px; background: var(--ink-4); margin: 0 10px; }
.hf-v {
  font-family: var(--serif);
  font-variation-settings: "opsz" 14, "wght" 380;
  font-size: 15.5px;
  line-height: 1.5;
  color: var(--ink-2);
}
.hf-v strong { font-variation-settings: "opsz" 14, "wght" 700; color: var(--ink-1); }
.hf-v em { font-style: italic; color: var(--ink-1); }

@media (max-width: 880px) {
  .hero-grid { grid-template-columns: 1fr; gap: 0; }
  .hero-meta { border-right: 0; border-bottom: 1px solid var(--ink-5); padding: 0 0 24px; margin-bottom: 32px; }
  .hero-foot { grid-template-columns: 1fr; gap: 8px; }
  .hf-sep { display: none; }
}

/* Spread (signal / practice / operator) */
.spread {
  display: grid;
  grid-template-columns: 3fr 8fr;
  gap: 56px;
  padding-top: 88px;
  padding-bottom: 88px;
}
.spread-head {
  position: sticky;
  top: 24px;
  align-self: start;
  padding-right: 28px;
  border-right: 1px solid var(--ink-5);
}
.spread-h {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(36px, 4.4vw, 58px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--ink-1);
  margin: 0;
}
.spread-h em {
  font-family: var(--serif);
  font-style: italic;
  font-variation-settings: "opsz" 144, "wght" 350;
  color: var(--accent);
}
.spread-lede {
  font-family: var(--serif);
  font-variation-settings: "opsz" 18, "wght" 400;
  font-size: 19px;
  line-height: 1.6;
  color: var(--ink-1);
  margin: 0 0 36px;
  max-width: 62ch;
}

.tenets {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--ink-5);
}
.tenet {
  padding: 26px 0;
  border-bottom: 1px solid var(--ink-5);
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 44px;
  align-items: baseline;
}
.tenet-h {
  font-family: var(--serif);
  font-variation-settings: "opsz" 28, "wght" 500;
  font-style: italic;
  font-size: 21px;
  line-height: 1.25;
  color: var(--ink-1);
  margin: 0;
}
.tenet p {
  font-family: var(--serif);
  font-variation-settings: "opsz" 14, "wght" 380;
  font-size: 16.5px;
  line-height: 1.6;
  color: var(--ink-2);
  margin: 0;
  max-width: 54ch;
}
@media (max-width: 860px) {
  .spread { grid-template-columns: 1fr; gap: 28px; padding-top: 64px; padding-bottom: 64px; }
  .spread-head { position: static; border-right: 0; border-bottom: 1px solid var(--ink-5); padding: 0 0 20px; }
  .tenet { grid-template-columns: 1fr; gap: 10px; }
}

/* What-we-build definition list */
.what { margin: 0; padding: 0; border-top: 1px solid var(--ink-5); }
.what-h {
  font-family: var(--serif);
  font-variation-settings: "opsz" 28, "wght" 500;
  font-style: italic;
  font-size: 22px;
  line-height: 1.25;
  color: var(--ink-1);
  padding: 28px 0 8px;
  margin: 0;
}
.what-b {
  font-family: var(--serif);
  font-variation-settings: "opsz" 14, "wght" 380;
  font-size: 16.5px;
  line-height: 1.65;
  color: var(--ink-2);
  margin: 0 0 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--ink-5);
  max-width: 62ch;
}

/* Case file */
.case { padding-top: 96px; padding-bottom: 96px; }
.case-head { margin-bottom: 44px; }
.case-h {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(64px, 11vw, 160px);
  line-height: 0.9;
  letter-spacing: -0.035em;
  color: var(--ink-1);
  margin: 0 0 12px;
}
.case-h em {
  font-family: var(--serif);
  font-style: italic;
  font-variation-settings: "opsz" 144, "wght" 300;
  color: var(--ink-1);
  font-size: 1em;
}
.case-sub {
  font-family: var(--serif);
  font-variation-settings: "opsz" 14, "wght" 400;
  font-size: 18px;
  color: var(--ink-2);
  margin: 0;
}
.case-sub strong { font-variation-settings: "opsz" 14, "wght" 600; color: var(--ink-1); }

.case-pull {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(26px, 3vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.012em;
  color: var(--ink-1);
  margin: 44px 0;
  padding: 28px 0 28px 36px;
  border-left: 3px solid var(--accent);
  max-width: 22ch;
  quotes: "\201C" "\201D";
}

.case-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 64px;
  align-items: start;
}
.case-body p {
  font-family: var(--serif);
  font-variation-settings: "opsz" 18, "wght" 400;
  font-size: 18px;
  line-height: 1.65;
  color: var(--ink-2);
  margin: 0;
  max-width: 58ch;
}
.case-meta {
  border-top: 1px solid var(--ink-1);
  padding-top: 20px;
}
.cm-row {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 14px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--ink-5);
}
.cm-row:last-child { border-bottom: 0; }
.cm-k {
  font-family: var(--serif);
  font-variation-settings: "opsz" 9, "wght" 600;
  font-style: italic;
  font-size: 12px;
  color: var(--ink-3);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.cm-v {
  font-family: var(--serif);
  font-variation-settings: "opsz" 14, "wght" 400;
  font-size: 15px;
  line-height: 1.45;
  color: var(--ink-1);
}
.cm-v em { color: var(--accent); font-weight: 500; }
@media (max-width: 860px) {
  .case-grid { grid-template-columns: 1fr; gap: 36px; }
  .case-pull { max-width: none; font-size: 26px; }
}

/* Operator */
.operator-role {
  font-family: var(--serif);
  font-variation-settings: "opsz" 14, "wght" 400;
  font-style: italic;
  font-size: 17px;
  color: var(--ink-3);
  margin: 8px 0 0;
}
.operator-body p {
  font-family: var(--serif);
  font-variation-settings: "opsz" 18, "wght" 400;
  font-size: 18px;
  line-height: 1.65;
  color: var(--ink-2);
  margin: 0 0 24px;
  max-width: 62ch;
}
.op-lede { color: var(--ink-1); }
.op-link { margin-top: 12px; }
.op-link a {
  font-family: var(--serif);
  font-variation-settings: "opsz" 14, "wght" 500;
  font-style: italic;
  font-size: 16px;
  color: var(--ink-1);
  border-bottom: 1px solid var(--ink-2);
  padding-bottom: 2px;
}
.op-link a:hover { color: var(--accent); border-color: var(--accent); }

/* XN-OS note */
.xnos-note {
  display: grid;
  grid-template-columns: 3fr 8fr;
  gap: 56px;
  align-items: start;
  padding-top: 72px;
  padding-bottom: 72px;
}
.xn-mark {
  font-family: var(--mono);
  font-size: 24px;
  font-weight: 500;
  color: var(--ink-1);
  letter-spacing: 0.02em;
  padding-top: 6px;
  padding-right: 24px;
  border-right: 1px solid var(--ink-5);
}
.xnm-bracket { color: var(--ink-4); }
.xnos-body {
  font-family: var(--serif);
  font-variation-settings: "opsz" 18, "wght" 400;
  font-size: 19px;
  line-height: 1.65;
  color: var(--ink-2);
  margin: 0;
  max-width: 62ch;
}
@media (max-width: 860px) {
  .xnos-note { grid-template-columns: 1fr; gap: 24px; }
  .xn-mark { border-right: 0; border-bottom: 1px solid var(--ink-5); padding: 0 0 16px; }
}

/* Contact */
.contact { padding-top: 96px; padding-bottom: 96px; }
.contact-head { max-width: 60ch; margin-bottom: 40px; }
.contact-h {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(44px, 6vw, 78px);
  line-height: 0.98;
  letter-spacing: -0.025em;
  color: var(--ink-1);
  margin: 0 0 20px;
}
.contact-sub {
  font-family: var(--serif);
  font-variation-settings: "opsz" 18, "wght" 400;
  font-size: 19px;
  line-height: 1.6;
  color: var(--ink-2);
  margin: 0;
}
.contact-sub a {
  color: var(--accent);
  border-bottom: 1px solid var(--accent);
}
.cal-wrap {
  min-height: 680px;
  background: var(--paper);
  border: 1px solid var(--ink-1);
}
#my-cal-inline-secret { width: 100%; min-height: 680px; overflow: auto; }

/* Colophon */
.colophon {
  max-width: var(--col-max);
  margin: 0 auto;
  padding: 32px var(--gutter-lg) 48px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 40px;
  align-items: baseline;
  font-family: var(--serif);
  font-variation-settings: "opsz" 12, "wght" 400;
  font-size: 14px;
  color: var(--ink-3);
}
.col-l { justify-self: start; }
.col-c { justify-self: center; display: flex; gap: 18px; }
.col-r { justify-self: end; font-style: italic; }
.col-mark {
  font-family: var(--display);
  font-size: 22px;
  color: var(--ink-1);
  line-height: 1;
  margin-bottom: 6px;
}
.col-meta { font-style: italic; font-size: 13px; }
.colophon a { color: var(--ink-2); border-bottom: 1px solid var(--ink-5); padding-bottom: 1px; }
.colophon a:hover { color: var(--accent); border-color: var(--accent); }
@media (max-width: 860px) {
  .colophon { grid-template-columns: 1fr; gap: 16px; padding: 28px var(--gutter-sm) 40px; }
  .col-l, .col-c, .col-r { justify-self: start; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}