/* ============================================================
   nosaagbogun.com — design system
   Cool document-grade neutrals, deep pine accent.
   Archivo (display) / Source Serif 4 (body) / IBM Plex Mono (utility)
   ============================================================ */

:root {
  --bg:        #EDF0F2;
  --surface:   #FBFCFC;
  --raise:     #F3F6F7;
  --ink:       #12181B;
  --ink-2:     #4B575E;
  --ink-3:     #737F86;
  --rule:      #CFD7DB;
  --rule-soft: #E1E7EA;
  --accent:    #17564A;
  --accent-2:  #2C7C6B;
  --accent-bg: #E4EDEA;
  --shadow:    0 1px 2px rgba(18,24,27,.05), 0 8px 28px rgba(18,24,27,.07);

  --f-display: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --f-body:    "Source Serif 4", Georgia, "Times New Roman", serif;
  --f-mono:    "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --measure: 63ch;
  --pad: clamp(1.25rem, 4vw, 3.5rem);
  --shell: 1120px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:        #0D1214;
    --surface:   #141B1E;
    --raise:     #1A2427;
    --ink:       #E8EDEF;
    --ink-2:     #A5B2B7;
    --ink-3:     #7A888E;
    --rule:      #2A363A;
    --rule-soft: #1E282B;
    --accent:    #6FC3AC;
    --accent-2:  #4FA894;
    --accent-bg: #16302A;
    --shadow:    0 1px 2px rgba(0,0,0,.3), 0 8px 28px rgba(0,0,0,.4);
  }
}

:root[data-theme="dark"] {
  --bg:        #0D1214;
  --surface:   #141B1E;
  --raise:     #1A2427;
  --ink:       #E8EDEF;
  --ink-2:     #A5B2B7;
  --ink-3:     #7A888E;
  --rule:      #2A363A;
  --rule-soft: #1E282B;
  --accent:    #6FC3AC;
  --accent-2:  #4FA894;
  --accent-bg: #16302A;
  --shadow:    0 1px 2px rgba(0,0,0,.3), 0 8px 28px rgba(0,0,0,.4);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 5.5rem; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 17px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; }
[hidden] { display: none !important; }

a { color: var(--accent); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip {
  position: absolute; left: 0; top: 0; z-index: 200;
  transform: translateY(-130%);
  background: var(--accent); color: var(--surface);
  padding: .6rem 1rem; font-family: var(--f-mono); font-size: .8rem;
}
.skip:focus { transform: none; }

.shell {
  max-width: var(--shell);
  margin: 0 auto;
  background: var(--surface);
  border-left: 1px solid var(--rule-soft);
  border-right: 1px solid var(--rule-soft);
  min-height: 100vh;
}

/* ---------- nav ---------- */

.nav {
  position: sticky; top: 0; z-index: 60;
  display: flex; align-items: center; gap: 1rem;
  padding: .85rem var(--pad);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule-soft);
}

.brand {
  font-family: var(--f-display); font-weight: 700; font-size: 1rem;
  letter-spacing: -.02em; color: var(--ink); text-decoration: none;
  margin-right: auto; white-space: nowrap;
}
.brand span { color: var(--accent); }

.nav-links { display: flex; gap: .2rem; align-items: center; }

.nav-links a {
  font-family: var(--f-mono); font-size: .74rem; letter-spacing: .07em;
  text-transform: uppercase; color: var(--ink-2); text-decoration: none;
  padding: .42rem .6rem; border-radius: 3px;
}
.nav-links a:hover { color: var(--ink); background: var(--raise); }
.nav-links a[aria-current="page"] { color: var(--accent); background: var(--accent-bg); }

.nav-tools { display: flex; gap: .35rem; align-items: center; }

.icon-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  height: 30px; padding: 0 .55rem;
  background: none; border: 1px solid var(--rule); border-radius: 3px;
  color: var(--ink-2); cursor: pointer;
  font-family: var(--f-mono); font-size: .7rem; letter-spacing: .04em;
}
.icon-btn:hover { color: var(--ink); border-color: var(--ink-3); }
.icon-btn svg { width: 14px; height: 14px; }

.kbd {
  font-family: var(--f-mono); font-size: .62rem;
  border: 1px solid var(--rule); border-radius: 2px;
  padding: .05rem .25rem; color: var(--ink-3);
}

@media (max-width: 860px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--surface); border-bottom: 1px solid var(--rule);
    padding: .4rem var(--pad) .8rem;
  }
  .nav-links.open a { padding: .6rem 0; font-size: .8rem; }
}
.menu-btn { display: none; }
@media (max-width: 860px) { .menu-btn { display: inline-flex; } }

/* ---------- generic layout ---------- */

.wrap { padding: clamp(2rem, 5vw, 3.4rem) var(--pad); }
.narrow { max-width: var(--measure); }

.split { display: grid; grid-template-columns: 14.5rem 1fr; gap: 0 3rem; }
.split > .lbl {
  font-family: var(--f-mono); font-size: .68rem; letter-spacing: .1em;
  text-transform: uppercase; color: var(--ink-3); padding-top: .55rem;
  border-top: 1px solid var(--rule); align-self: start;
}
.split > .col { max-width: var(--measure); }
.split > .col > :last-child { margin-bottom: 0; }
@media (max-width: 820px) {
  .split { grid-template-columns: 1fr; gap: .7rem; }
  .split > .lbl { padding-top: .5rem; }
}

.eyebrow {
  font-family: var(--f-mono); font-size: .72rem; font-weight: 500;
  letter-spacing: .16em; text-transform: uppercase; color: var(--accent);
  margin: 0 0 .8rem;
}

h1, h2, h3, h4 { font-family: var(--f-display); letter-spacing: -.018em; text-wrap: balance; }

h1 { font-size: clamp(2.1rem, 5.4vw, 3.3rem); line-height: 1.04; font-weight: 700; margin: 0 0 1.1rem; }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); line-height: 1.14; font-weight: 600; margin: 0 0 1rem; }
h3 { font-size: clamp(1.24rem, 2.4vw, 1.55rem); line-height: 1.18; font-weight: 600; margin: 0 0 .85rem; }
h4 { font-size: 1.02rem; line-height: 1.3; font-weight: 600; margin: 0 0 .5rem; }

p { margin: 0 0 1rem; }
.lede { font-size: clamp(1.08rem, 2vw, 1.24rem); color: var(--ink); }
.sub { color: var(--ink-2); }
.small { font-size: .95rem; color: var(--ink-2); }

.section-head {
  display: flex; align-items: baseline; gap: 1rem;
  padding: clamp(2rem, 4vw, 2.9rem) var(--pad) 0;
}
.section-head h2 {
  font-family: var(--f-mono); font-size: .74rem; font-weight: 500;
  letter-spacing: .16em; text-transform: uppercase; color: var(--ink-3);
  margin: 0; white-space: nowrap;
}
.section-head .fill { flex: 1; height: 1px; background: var(--rule); }

hr.rule { border: none; border-top: 1px solid var(--rule-soft); margin: 0; }

/* ---------- home hero ---------- */

.hero {
  padding: clamp(3rem, 8vw, 6rem) var(--pad) clamp(2rem, 4vw, 3rem);
  border-bottom: 2px solid var(--ink);
}
.hero h1 { max-width: 19ch; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero .lede { max-width: var(--measure); margin-bottom: 1.6rem; }

.hero-actions { display: flex; flex-wrap: wrap; gap: .6rem; align-items: center; }

.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--f-mono); font-size: .76rem; letter-spacing: .06em;
  text-transform: uppercase; text-decoration: none;
  padding: .68rem 1.1rem; border-radius: 3px; border: 1px solid var(--accent);
  background: var(--accent); color: var(--surface);
  transition: transform .12s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn.ghost { background: none; color: var(--accent); }
.btn.ghost:hover { background: var(--accent-bg); }

/* proof strip */
.proof {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  gap: 0; border-bottom: 1px solid var(--rule-soft);
}
.proof div {
  padding: 1.4rem var(--pad);
  border-right: 1px solid var(--rule-soft);
}
.proof div:last-child { border-right: none; }
.proof .n {
  display: block; font-family: var(--f-display); font-weight: 700;
  font-size: clamp(1.5rem, 3vw, 1.95rem); line-height: 1; color: var(--accent);
  letter-spacing: -.02em; font-variant-numeric: tabular-nums;
}
.proof .l {
  display: block; margin-top: .45rem;
  font-family: var(--f-mono); font-size: .66rem; line-height: 1.4;
  letter-spacing: .06em; text-transform: uppercase; color: var(--ink-3);
}

/* ---------- cards / grids ---------- */

.grid { display: grid; gap: 1px; background: var(--rule-soft); }
.grid.two { grid-template-columns: repeat(auto-fit, minmax(19rem, 1fr)); }
.grid.three { grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); }
.grid > * { background: var(--surface); padding: clamp(1.3rem, 3vw, 2rem) var(--pad); }

.tile-link { text-decoration: none; color: inherit; display: block; transition: background .14s ease; }
.tile-link:hover { background: var(--raise); }
.tile-link .go {
  font-family: var(--f-mono); font-size: .7rem; letter-spacing: .08em;
  text-transform: uppercase; color: var(--accent);
}

/* ---------- case studies ---------- */

.case {
  display: grid; grid-template-columns: 14.5rem 1fr; gap: 0 3rem;
  padding: clamp(1.75rem, 3.5vw, 2.6rem) var(--pad);
  border-bottom: 1px solid var(--rule-soft);
}
.case:last-of-type { border-bottom: none; }

.rail {
  display: flex; flex-direction: column; gap: 1rem;
  font-family: var(--f-mono); font-size: .73rem; line-height: 1.5;
  padding-top: .5rem;
}
.rail-block { display: flex; flex-direction: column; gap: .2rem; }
.rail-key {
  color: var(--ink-3); letter-spacing: .1em; text-transform: uppercase; font-size: .65rem;
}
.rail-val { color: var(--ink-2); }
.rail-val strong { color: var(--ink); font-weight: 500; }

.tags { display: flex; flex-wrap: wrap; gap: .3rem; list-style: none; padding: 0; margin: 0; }
.tags li {
  font-family: var(--f-mono); font-size: .67rem; color: var(--accent);
  border: 1px solid var(--rule); padding: .1rem .4rem; white-space: nowrap;
}

.case .body { max-width: var(--measure); }

.figures {
  display: flex; flex-wrap: wrap; gap: 0 2.2rem; list-style: none;
  margin: 0 0 1rem; padding: .9rem 0;
  border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule);
}
.figures li { display: flex; flex-direction: column; gap: .1rem; padding: .3rem 0; }
.fig-val {
  font-family: var(--f-display); font-weight: 600; font-size: 1.32rem; line-height: 1.1;
  letter-spacing: -.015em; color: var(--accent); font-variant-numeric: tabular-nums;
}
.fig-lab {
  font-family: var(--f-mono); font-size: .66rem; line-height: 1.35;
  letter-spacing: .06em; text-transform: uppercase; color: var(--ink-3);
}

.note {
  border-left: 2px solid var(--accent); padding-left: 1rem;
  color: var(--ink-2); font-size: .97rem;
}

.reflect {
  margin: 1.1rem 0 0; padding: .85rem 0 0;
  border-top: 1px solid var(--rule); font-size: .97rem; color: var(--ink-2);
}
.reflect b {
  font-family: var(--f-mono); display: block; font-size: .65rem; font-weight: 500;
  letter-spacing: .11em; text-transform: uppercase; color: var(--accent); margin-bottom: .3rem;
}

/* progressive disclosure */
.more { display: none; }
.more.open { display: block; }
.disclose {
  margin-top: .3rem;
  background: none; border: none; cursor: pointer; padding: .35rem 0;
  font-family: var(--f-mono); font-size: .7rem; letter-spacing: .08em;
  text-transform: uppercase; color: var(--accent);
  display: inline-flex; align-items: center; gap: .4rem;
}
.disclose::after { content: "+"; font-size: .9rem; line-height: 1; }
.disclose[aria-expanded="true"]::after { content: "\2212"; }

/* ---------- filters ---------- */

.filters {
  display: flex; flex-wrap: wrap; gap: .4rem; align-items: center;
  padding: 1rem var(--pad) 1.3rem;
  border-bottom: 1px solid var(--rule-soft);
}
.filters .flabel {
  font-family: var(--f-mono); font-size: .66rem; letter-spacing: .1em;
  text-transform: uppercase; color: var(--ink-3); margin-right: .4rem;
}
.chip {
  font-family: var(--f-mono); font-size: .7rem; letter-spacing: .04em;
  padding: .34rem .7rem; border: 1px solid var(--rule); border-radius: 100px;
  background: none; color: var(--ink-2); cursor: pointer;
}
.chip:hover { border-color: var(--ink-3); color: var(--ink); }
.chip[aria-pressed="true"] {
  background: var(--accent); border-color: var(--accent); color: var(--surface);
}
.filter-count {
  font-family: var(--f-mono); font-size: .68rem; color: var(--ink-3); margin-left: auto;
}

/* ---------- diagram ---------- */

figure.diagram { margin: 0 0 1.1rem; padding: 1.1rem 0 0; border-top: 1px solid var(--rule); }
figure.diagram svg { width: 100%; height: auto; display: block; color: var(--ink-2); }
figure.diagram figcaption {
  font-family: var(--f-mono); font-size: .67rem; line-height: 1.5;
  letter-spacing: .04em; color: var(--ink-3); padding-top: .7rem;
}
.diagram-toggle { display: flex; gap: .35rem; margin-bottom: .9rem; }
.diagram-toggle .chip { border-radius: 3px; }

.dg-state { transition: opacity .28s ease; }
.dg-state[data-off="1"] { opacity: 0; pointer-events: none; }

/* ---------- command palette ---------- */

.palette {
  position: fixed; inset: 0; z-index: 200;
  display: flex; align-items: flex-start; justify-content: center;
  padding: 12vh 1rem 1rem;
  background: color-mix(in srgb, var(--ink) 34%, transparent);
  backdrop-filter: blur(3px);
}
.palette[hidden] { display: none !important; }
.palette-box {
  width: min(560px, 100%);
  background: var(--surface); border: 1px solid var(--rule);
  border-radius: 6px; box-shadow: var(--shadow); overflow: hidden;
}
.palette input {
  width: 100%; border: none; outline: none; background: none;
  padding: 1rem 1.1rem; color: var(--ink);
  font-family: var(--f-body); font-size: 1.02rem;
  border-bottom: 1px solid var(--rule-soft);
}
.palette input::placeholder { color: var(--ink-3); }
.palette ul { list-style: none; margin: 0; padding: .35rem; max-height: 46vh; overflow-y: auto; }
.palette li a, .palette li button {
  display: flex; align-items: baseline; gap: .7rem; width: 100%;
  padding: .55rem .75rem; border-radius: 4px; text-decoration: none;
  color: var(--ink); background: none; border: none; cursor: pointer;
  font-family: var(--f-body); font-size: .95rem; text-align: left;
}
.palette li[data-active="1"] a, .palette li[data-active="1"] button { background: var(--accent-bg); }
.palette .p-kind {
  font-family: var(--f-mono); font-size: .62rem; letter-spacing: .08em;
  text-transform: uppercase; color: var(--ink-3); margin-left: auto; white-space: nowrap;
}
.palette-foot {
  padding: .5rem .9rem; border-top: 1px solid var(--rule-soft);
  font-family: var(--f-mono); font-size: .64rem; color: var(--ink-3);
  display: flex; gap: 1rem;
}
.palette .empty { padding: 1rem .75rem; color: var(--ink-3); font-size: .95rem; }

/* ---------- timeline (about) ---------- */

.timeline { list-style: none; margin: 0; padding: 0; }
.timeline li {
  display: grid; grid-template-columns: 11rem 1fr; gap: 0 2rem;
  padding: 1rem 0; border-top: 1px solid var(--rule-soft);
}
.timeline li:first-child { border-top: none; }
.timeline .when {
  font-family: var(--f-mono); font-size: .72rem; letter-spacing: .04em;
  color: var(--ink-3); padding-top: .2rem;
}
.timeline .role { font-family: var(--f-display); font-weight: 600; font-size: 1rem; }
.timeline .org { color: var(--ink-2); font-size: .95rem; }

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

.foot {
  border-top: 2px solid var(--ink);
  padding: clamp(1.8rem, 3vw, 2.4rem) var(--pad) clamp(2.4rem, 5vw, 3.4rem);
  display: flex; flex-wrap: wrap; gap: 1.2rem 2.5rem;
  justify-content: space-between; align-items: flex-end;
}
.foot p { margin: 0; max-width: 42ch; font-size: .95rem; color: var(--ink-2); }
.foot-links { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; font-family: var(--f-mono); font-size: .78rem; }
.foot-links a { color: var(--accent); text-decoration: none; border-bottom: 1px solid var(--rule); }
.foot-links a:hover { border-bottom-color: var(--accent); }

/* ---------- load sequence ---------- */

@media (prefers-reduced-motion: no-preference) {
  .rise { animation: rise .5s cubic-bezier(.22,.8,.3,1) both; }
  .rise:nth-child(2) { animation-delay: .06s; }
  .rise:nth-child(3) { animation-delay: .12s; }
  .rise:nth-child(4) { animation-delay: .18s; }
}
@keyframes rise { from { opacity: 0; transform: translateY(9px); } to { opacity: 1; transform: none; } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* ---------- responsive ---------- */

@media (max-width: 820px) {
  .case { grid-template-columns: 1fr; gap: 1.15rem; }
  .rail { padding-top: 0; flex-direction: row; flex-wrap: wrap; gap: .8rem 1.7rem; }
  .rail .tags { flex-basis: 100%; }
  .timeline li { grid-template-columns: 1fr; gap: .25rem; }
  .proof div { border-right: none; border-bottom: 1px solid var(--rule-soft); }
}


/* ---------- 2026: native view transitions between pages ---------- */
@view-transition { navigation: auto; }
@media (prefers-reduced-motion: reduce) { @view-transition { navigation: none; } }

/* ---------- 2026: scroll-driven reveal, no JS, no observer ---------- */
@supports (animation-timeline: view()) {
  @media (prefers-reduced-motion: no-preference) {
    .case, .grid > *, .timeline li, .proof div {
      animation: enter linear both;
      animation-timeline: view();
      animation-range: entry 0% entry 46%;
    }
    @keyframes enter { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
  }
}

/* ---------- 2026: variable-weight kinetic heading ---------- */
@supports (font-variation-settings: normal) {
  .hero h1 { font-variation-settings: "wght" 700; transition: font-variation-settings .5s ease; }
}

/* reading progress on long pages */
.progress {
  position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: 90;
  background: var(--accent); transform-origin: 0 50%; transform: scaleX(0);
}
@supports (animation-timeline: scroll()) {
  .progress { animation: grow linear both; animation-timeline: scroll(root block); }
  @keyframes grow { to { transform: scaleX(1); } }
}

/* copy-to-clipboard micro-interaction */
.copy {
  display: inline-flex; align-items: center; gap: .4rem;
  background: none; border: 1px solid var(--rule); border-radius: 3px;
  padding: .3rem .55rem; cursor: pointer; color: var(--ink-2);
  font-family: var(--f-mono); font-size: .68rem; letter-spacing: .05em;
  text-transform: uppercase; transition: color .15s ease, border-color .15s ease;
}
.copy:hover { color: var(--ink); border-color: var(--ink-3); }
.copy[data-done="1"] { color: var(--accent); border-color: var(--accent); }

/* offset accent slab — one deliberate grid break */
.slab {
  position: relative;
  padding: clamp(1.6rem, 3.4vw, 2.3rem) var(--pad);
  background: var(--accent-bg);
  border-top: 1px solid var(--rule-soft); border-bottom: 1px solid var(--rule-soft);
}
.slab .narrow, .slab .col { max-width: 68ch; }
.slab p:last-child { margin-bottom: 0; }

/* capability list */
.caps { list-style: none; margin: 0; padding: 0; display: grid; gap: 1px; background: var(--rule-soft); }
.caps > li { background: var(--surface); padding: clamp(1.2rem, 2.6vw, 1.7rem) var(--pad); }
.caps .cap-k {
  font-family: var(--f-mono); font-size: .68rem; letter-spacing: .1em;
  text-transform: uppercase; color: var(--accent); display: block; margin-bottom: .45rem;
}
.caps h3 { margin-bottom: .5rem; }
.caps p { margin-bottom: 0; max-width: var(--measure); }
.caps p + p { margin-top: .7rem; }

/* inline metric run */
.runs { display: flex; flex-wrap: wrap; gap: .45rem; margin: .9rem 0 0; padding: 0; list-style: none; }
.runs li {
  font-family: var(--f-mono); font-size: .7rem; letter-spacing: .03em;
  border: 1px solid var(--rule); border-radius: 100px; padding: .3rem .7rem; color: var(--ink-2);
}
.runs li b { color: var(--accent); font-weight: 500; }

@media print { .progress, .copy { display: none !important; } }

/* ---------- print ---------- */

@media print {
  :root {
    --bg:#fff; --surface:#fff; --raise:#fff; --ink:#000; --ink-2:#333; --ink-3:#555;
    --rule:#999; --rule-soft:#ccc; --accent:#14483E; --accent-bg:#fff;
  }
  body { font-size: 10.5pt; line-height: 1.45; }
  .shell { max-width: none; border: none; min-height: 0; }
  .nav, .filters, .palette, .disclose, .diagram-toggle, .hero-actions, .skip { display: none !important; }
  .more { display: block !important; }
  .case, figure.diagram, .figures { page-break-inside: avoid; break-inside: avoid; }
}