/* ─────────────────────────────────────────────────────────────
   Cleveris Research — Graphite Atelier
   A pencil-sketch / art-research editorial aesthetic.
   ───────────────────────────────────────────────────────────── */

:root {
  /* Paper & graphite */
  --paper:        #f3efe6;   /* warm off-white paper */
  --paper-2:      #ece7db;
  --paper-3:      #e2dccd;
  --ink:          #1c1a16;   /* warm graphite black */
  --ink-2:        #3a362e;
  --ink-3:        #6b6557;
  --ink-4:        #9a9384;
  --rule:         #c9c1b0;
  --rule-soft:    #d8d1c0;

  /* Accents — used with great restraint */
  --pencil-blue:  #3a5a7a;   /* construction-line blue, faint */
  --ink-red:      #9a3b2e;   /* red-pencil annotation, rare */

  /* Type */
  --serif:  "EB Garamond", "Big Caslon", "Hoefler Text", Baskerville, Georgia, serif;
  --sans:   "Inter", -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  --mono:   "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --maxw:   1240px;
  --gut:    48px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  /* faint paper grain via repeating gradient */
  background-image:
    radial-gradient(rgba(28,26,22,0.018) 1px, transparent 1px),
    radial-gradient(rgba(28,26,22,0.012) 1px, transparent 1px);
  background-size: 3px 3px, 7px 7px;
  background-position: 0 0, 1px 2px;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
em { font-style: italic; }

.filter-defs { position: absolute; width: 0; height: 0; overflow: hidden; }

/* ── Top bar ── */
.topbar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 28px;
  padding: 16px var(--gut);
  background: rgba(243,239,230,0.86);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}
.wordmark { display: inline-flex; align-items: center; gap: 10px; }
.wm-mark {
  font-family: var(--serif); font-weight: 600; font-size: 15px;
  letter-spacing: 0.5px;
  border: 1.5px solid var(--ink); border-radius: 2px;
  padding: 2px 7px 3px; line-height: 1;
}
.wm-mark.big { font-size: 30px; padding: 6px 13px 8px; }
.wm-text { font-family: var(--serif); font-size: 18px; font-weight: 500; letter-spacing: 0.2px; }
.topnav { display: flex; gap: 26px; margin-left: 8px; }
.topnav a {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.6px;
  text-transform: uppercase; color: var(--ink-3);
  transition: color 0.2s;
}
.topnav a:hover { color: var(--ink); }
.topbar-meta {
  margin-left: auto; font-family: var(--mono); font-size: 10.5px;
  letter-spacing: 0.8px; color: var(--ink-4); text-transform: uppercase;
}

@media (max-width: 820px) {
  .topbar { gap: 14px; padding: 14px 20px; }
  .topnav { display: none; }
  .topbar-meta { display: none; }
}

/* ── Banner ── */
.banner {
  position: relative;
  min-height: 92vh;
  display: flex; flex-direction: column; justify-content: flex-end;
  overflow: hidden;
  border-bottom: 1px solid var(--ink);
}
.banner-frame { position: absolute; inset: 0; }
.banner-img {
  width: 100%; height: 100%; object-fit: cover;
  object-position: 64% 76%;          /* crop to hands & the divine */
  filter: url(#pencil) contrast(1.05) brightness(1.02);
  transform: scale(1.04);
}
.banner-veil {
  position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(243,239,230,0.55) 0%, rgba(243,239,230,0.05) 26%, rgba(243,239,230,0.0) 50%, rgba(243,239,230,0.0) 62%, rgba(243,239,230,0.78) 100%),
    linear-gradient(90deg, rgba(243,239,230,0.30) 0%, rgba(243,239,230,0.0) 40%);
}
.banner-grain {
  position: absolute; inset: 0; opacity: 0.5; mix-blend-mode: multiply;
  background-image: radial-gradient(rgba(28,26,22,0.05) 1px, transparent 1px);
  background-size: 4px 4px;
}
.banner-overlay {
  position: relative; z-index: 2;
  padding: 0 var(--gut) 64px;
  max-width: var(--maxw); width: 100%; margin: 0 auto;
}
.banner-label {
  display: flex; align-items: center; gap: 14px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 1.2px;
  text-transform: uppercase; color: var(--ink-2);
  margin-bottom: 26px;
}
.label-rule { width: 56px; height: 1px; background: var(--ink-2); }
.banner-title {
  font-family: var(--serif); font-weight: 500;
  font-size: clamp(40px, 7.2vw, 92px);
  line-height: 1.02; letter-spacing: -0.5px;
  color: var(--ink); max-width: 14ch;
  text-shadow: 0 1px 0 rgba(243,239,230,0.4);
}
.banner-title em { font-style: italic; font-weight: 400; color: var(--ink-red); }
.banner-sub {
  margin-top: 26px; max-width: 46ch;
  font-size: clamp(15px, 1.6vw, 19px); line-height: 1.55; color: var(--ink-2);
}
.banner-caption {
  position: relative; z-index: 2;
  display: flex; align-items: center; gap: 10px;
  padding: 14px var(--gut); border-top: 1px solid var(--rule);
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.6px;
  text-transform: uppercase; color: var(--ink-3);
  background: rgba(243,239,230,0.7);
}
.banner-caption .dot { color: var(--ink-4); }

@media (max-width: 820px) {
  .banner { min-height: 86vh; }
  .banner-overlay { padding: 0 20px 44px; }
  .banner-caption { padding: 12px 20px; flex-wrap: wrap; }
}

/* ── Section heads ── */
.section-head {
  display: flex; align-items: baseline; gap: 18px;
  padding: 0 var(--gut); max-width: var(--maxw); margin: 0 auto;
  margin-bottom: 36px;
}
.section-num {
  font-family: var(--mono); font-size: 12px; color: var(--ink-red);
  letter-spacing: 0.5px;
}
.section-label {
  font-family: var(--mono); font-size: 12px; letter-spacing: 2px;
  text-transform: uppercase; color: var(--ink);
  padding-bottom: 4px; border-bottom: 1px solid var(--ink);
}
.section-tail {
  margin-left: auto; font-family: var(--serif); font-style: italic;
  font-size: 15px; color: var(--ink-3);
}

/* ── Manifesto ── */
.manifesto { padding: 120px 0 110px; border-bottom: 1px solid var(--rule); }
.manifesto-body {
  max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gut);
  display: flex; align-items: center; gap: 56px;
}
.manifesto-text { flex: 1; max-width: 62ch; }
.manifesto-img {
  flex: 0 0 320px; width: 320px; height: auto; aspect-ratio: 1;
  object-fit: cover; border: 1px solid var(--rule-soft);
  filter: url(#pencil-soft) contrast(0.95);
}
.lede {
  font-family: var(--serif); font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.28; letter-spacing: -0.3px; color: var(--ink);
  margin-bottom: 36px;
}
.lede em { color: var(--ink-red); }
.body { font-size: 17px; line-height: 1.7; color: var(--ink-2); }
.body em { color: var(--ink); }
@media (max-width: 820px) {
  .manifesto-body { flex-direction: column; gap: 32px; }
  .manifesto-img { flex: none; width: 100%; max-width: 360px; }
  .manifesto-text { max-width: none; }
}

/* ── Studies grid ── */
.studies { padding: 110px 0 120px; border-bottom: 1px solid var(--rule); }
.study-grid {
  max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gut);
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 56px 48px;
}
.study { display: flex; flex-direction: column; }
.study-img-wrap {
  position: relative; aspect-ratio: 4 / 5; overflow: hidden;
  background: var(--paper-2); border: 1px solid var(--rule-soft);
}
.study-img {
  width: 100%; height: 100%; object-fit: cover;
  filter: url(#pencil) contrast(1.04);
  transform: scale(1.03);
  transition: transform 0.7s cubic-bezier(.2,.7,.2,1), filter 0.5s;
}
.study-img.soft { filter: url(#pencil-soft) contrast(1.02) brightness(1.03); }
.study:hover .study-img { transform: scale(1.06); }
.study-img-wrap::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  box-shadow: inset 0 0 60px rgba(28,26,22,0.10);
}
figcaption {
  margin-top: 16px; display: flex; gap: 12px; align-items: baseline;
  font-family: var(--serif); font-size: 15.5px; line-height: 1.5; color: var(--ink-2);
  font-style: italic; max-width: 38ch;
}
.fig-tag {
  font-family: var(--mono); font-style: normal; font-size: 10.5px;
  letter-spacing: 1px; color: var(--ink-red); white-space: nowrap;
}

@media (max-width: 820px) {
  .study-grid { grid-template-columns: 1fr; gap: 44px; padding: 0 20px; }
}

/* ── Practice ── */
.practice { padding: 110px 0 120px; border-bottom: 1px solid var(--rule); }
.practice-list {
  list-style: none; max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gut);
}
.practice-item {
  display: grid; grid-template-columns: 80px 1fr 110px; align-items: baseline; gap: 28px;
  padding: 34px 0; border-top: 1px solid var(--rule-soft);
  transition: background 0.3s;
}
.practice-item:last-child { border-bottom: 1px solid var(--rule-soft); }
.practice-item:hover { background: linear-gradient(90deg, rgba(154,59,46,0.04), transparent 70%); }
.pr-num { font-family: var(--mono); font-size: 13px; color: var(--ink-4); letter-spacing: 1px; }
.pr-body h3 {
  font-family: var(--serif); font-weight: 500; font-size: 26px; letter-spacing: -0.2px;
  margin-bottom: 6px; color: var(--ink);
}
.pr-body p { font-size: 16px; line-height: 1.6; color: var(--ink-3); max-width: 56ch; }
.pr-tag {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 1.4px;
  text-transform: uppercase; color: var(--ink-4); text-align: right;
  border: 1px solid var(--rule); border-radius: 2px; padding: 3px 8px; justify-self: end;
}

@media (max-width: 820px) {
  .practice-item { grid-template-columns: 50px 1fr; gap: 16px; }
  .pr-tag { grid-column: 2; justify-self: start; margin-top: 8px; }
}

/* ── Note / pull quote ── */
.note {
  position: relative;
  padding: 130px var(--gut); border-bottom: 1px solid var(--rule);
  background:
    repeating-linear-gradient(135deg, rgba(58,90,122,0.045) 0 1px, transparent 1px 26px);
  overflow: hidden;
}
.note-bg {
  position: absolute; right: 0; top: 50%; transform: translateY(-50%);
  height: 90%; width: auto; max-width: 45%; opacity: 0.22;
  filter: url(#pencil-soft) contrast(0.9); pointer-events: none;
}
.note-veil {
  position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(90deg, var(--paper) 30%, rgba(243,239,230,0.3) 60%, transparent 100%);
}
.note blockquote {
  position: relative; z-index: 2;
  max-width: 1000px; margin: 0 auto;
  font-family: var(--serif); font-style: italic; font-weight: 400;
  font-size: clamp(26px, 4.4vw, 54px); line-height: 1.3; letter-spacing: -0.3px;
  color: var(--ink); text-align: center;
}
.quote-mark {
  font-family: var(--serif); font-style: normal; font-size: 1.4em; line-height: 0;
  color: var(--ink-red); vertical-align: -0.2em; margin-right: 0.08em;
}
.note cite {
  display: block; margin-top: 28px; font-style: normal;
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 1px;
  text-transform: uppercase; color: var(--ink-4);
}

/* ── Colophon ── */
.colophon { padding: 90px var(--gut) 40px; }
.colo-top {
  max-width: var(--maxw); margin: 0 auto;
  display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap;
}
.colo-mark { display: flex; align-items: center; gap: 16px; }
.colo-name { font-family: var(--serif); font-size: 22px; font-weight: 500; }
.colo-sub { font-family: var(--mono); font-size: 11px; color: var(--ink-4); letter-spacing: 0.5px; margin-top: 2px; }
.colo-cols { display: flex; gap: 56px; }
.colo-col { display: flex; flex-direction: column; gap: 8px; min-width: 150px; }
.colo-h {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 1.4px;
  text-transform: uppercase; color: var(--ink-4); margin-bottom: 6px;
}
.colo-col a, .colo-col span { font-size: 14.5px; color: var(--ink-2); }
.colo-col a:hover { color: var(--ink-red); }
.colo-rule { max-width: var(--maxw); margin: 48px auto 0; height: 1px; background: var(--rule); }
.colo-bottom {
  max-width: var(--maxw); margin: 22px auto 0;
  display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap;
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.5px; color: var(--ink-4);
}
.signature { font-family: var(--serif); font-size: 14px; letter-spacing: 0.3px; color: var(--ink-3); }

@media (max-width: 820px) {
  .colo-cols { gap: 28px; flex-wrap: wrap; }
  .section-head { padding: 0 20px; margin-bottom: 28px; }
  .section-tail { display: none; }
  .manifesto-body { padding: 0 20px; }
  .practice-list { padding: 0 20px; }
  .manifesto, .studies, .practice { padding-top: 80px; padding-bottom: 80px; }
  .note { padding: 90px 20px; }
}

/* ── Banner CTA buttons ── */
.banner-cta { margin-top: 34px; display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.8px;
  text-transform: uppercase; padding: 13px 22px; border-radius: 2px;
  transition: background 0.25s, color 0.25s, border-color 0.25s, transform 0.15s;
  border: 1.5px solid var(--ink);
}
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: var(--ink-red); border-color: var(--ink-red); transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: var(--paper); transform: translateY(-1px); }

/* ── Features grid ── */
.features { padding: 110px 0 120px; border-bottom: 1px solid var(--rule); }
.feature-grid {
  max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gut);
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 56px 48px;
}
.feature { display: flex; flex-direction: column; }
.feat-img-wrap {
  position: relative; aspect-ratio: 16 / 10; overflow: hidden;
  background: var(--paper-2); border: 1px solid var(--rule-soft); margin-bottom: 22px;
}
.feat-body { display: flex; flex-direction: column; gap: 6px; }
.feat-body h3 {
  font-family: var(--serif); font-weight: 500; font-size: 27px; letter-spacing: -0.2px;
  color: var(--ink); margin-top: 4px;
}
.feat-body p { font-size: 16px; line-height: 1.6; color: var(--ink-3); max-width: 44ch; }
.feat-points {
  list-style: none; margin-top: 12px; display: flex; flex-direction: column; gap: 6px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.4px; color: var(--ink-4);
}
.feat-points li { padding-left: 14px; position: relative; }
.feat-points li::before { content: "·"; position: absolute; left: 4px; color: var(--ink-red); }
@media (max-width: 820px) {
  .feature-grid { grid-template-columns: 1fr; gap: 44px; padding: 0 20px; }
  .features { padding-top: 80px; padding-bottom: 80px; }
}

/* ── Commands ── */
.commands { padding: 110px 0 120px; border-bottom: 1px solid var(--rule); }
.cmd-table {
  max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gut);
  display: flex; flex-direction: column;
}
.cmd-row {
  display: grid; grid-template-columns: 200px 1fr; gap: 28px; align-items: baseline;
  padding: 16px 0; border-top: 1px solid var(--rule-soft);
  font-size: 15.5px; color: var(--ink-2);
}
.cmd-row:last-of-type { border-bottom: 1px solid var(--rule-soft); }
.cmd-row code {
  font-family: var(--mono); font-size: 14px; color: var(--ink-red);
  background: var(--paper-2); padding: 3px 8px; border-radius: 2px; justify-self: start;
}
.cmd-head {
  border-top: none; padding: 8px 0;
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 1.4px;
  text-transform: uppercase; color: var(--ink-4);
}
.cmd-head span { color: var(--ink-4); }
.cmd-keys {
  max-width: var(--maxw); margin: 28px auto 0; padding: 0 var(--gut);
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  font-family: var(--mono); font-size: 12px; color: var(--ink-3);
}
.key-label { letter-spacing: 1.4px; text-transform: uppercase; color: var(--ink-4); margin-right: 6px; }
.cmd-keys kbd {
  font-family: var(--mono); font-size: 11.5px; color: var(--ink);
  border: 1px solid var(--ink); border-radius: 3px; padding: 3px 8px; background: var(--paper-2);
}
.cmd-keys span { color: var(--ink-3); }
@media (max-width: 820px) {
  .cmd-row { grid-template-columns: 130px 1fr; gap: 16px; }
  .cmd-table, .cmd-keys { padding: 0 20px; }
  .commands { padding-top: 80px; padding-bottom: 80px; }
}

/* ── Download ── */
.download { position: relative; padding: 110px 0 120px; border-bottom: 1px solid var(--rule); overflow: hidden; }
.download-bg {
  position: absolute; left: 0; top: 50%; transform: translateY(-50%);
  height: 85%; width: auto; max-width: 40%; opacity: 0.15;
  filter: url(#pencil-soft) contrast(0.9); pointer-events: none;
}
.download-veil {
  position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(90deg, transparent 0%, rgba(243,239,230,0.3) 40%, var(--paper) 70%);
}
.download .section-head, .download .dl-grid, .download .dl-note { position: relative; z-index: 2; }
.dl-grid {
  max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gut);
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px;
}
.dl-card {
  display: flex; flex-direction: column; gap: 10px;
  padding: 26px 22px; border: 1px solid var(--rule); border-radius: 3px;
  background: var(--paper-2); transition: border-color 0.25s, transform 0.2s, box-shadow 0.25s;
}
.dl-card:hover {
  border-color: var(--ink); transform: translateY(-3px);
  box-shadow: 0 10px 28px rgba(28,26,22,0.10);
}
.dl-card.alt { background: transparent; }
.dl-head { display: flex; justify-content: space-between; align-items: center; }
.dl-tag {
  font-family: var(--mono); font-size: 9.5px; letter-spacing: 1.4px;
  text-transform: uppercase; color: var(--paper); background: var(--ink-red);
  padding: 3px 7px; border-radius: 2px;
}
.dl-tag.ghost { background: transparent; color: var(--ink-4); border: 1px solid var(--rule); }
.dl-arch { font-family: var(--mono); font-size: 11px; color: var(--ink-3); letter-spacing: 0.5px; }
.dl-card h3 { font-family: var(--serif); font-weight: 500; font-size: 22px; color: var(--ink); }
.dl-meta { font-family: var(--mono); font-size: 11.5px; color: var(--ink-4); letter-spacing: 0.4px; }
.dl-cta {
  margin-top: 10px; font-family: var(--mono); font-size: 12px; letter-spacing: 0.8px;
  text-transform: uppercase; color: var(--ink-red);
}
.dl-card:hover .dl-cta { color: var(--ink); }
.dl-note {
  max-width: var(--maxw); margin: 30px auto 0; padding: 0 var(--gut);
  font-size: 14.5px; line-height: 1.7; color: var(--ink-3);
}
.dl-note code {
  font-family: var(--mono); font-size: 12.5px; color: var(--ink);
  background: var(--paper-2); padding: 2px 6px; border-radius: 2px;
}
@media (max-width: 1080px) { .dl-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) {
  .dl-grid { grid-template-columns: 1fr; padding: 0 20px; }
  .dl-note { padding: 0 20px; }
  .download { padding-top: 80px; padding-bottom: 80px; }
}

/* ── Reveal animation ── */
.reveal {
  opacity: 0; transform: translateY(22px);
  transition: opacity 0.9s cubic-bezier(.2,.7,.2,1), transform 0.9s cubic-bezier(.2,.7,.2,1);
}
.reveal.in-view { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
  .study:hover .study-img { transform: scale(1.03); }
}