/* Arvelos Software — clickarvelos.com
   Design system: "technical almanac / editorial utility"
   Warm paper ground, warm-black ink, one blue accent (from the A/V logo).
   Type: Fraunces (display) · IBM Plex Sans (body) · IBM Plex Mono (metadata). */

:root {
  --paper:      #f7f4ef;
  --paper-2:    #f0ece3;   /* slightly recessed panels */
  --ink:        #1c1b17;
  --ink-2:      #45433b;   /* secondary text */
  --ink-3:      #6f6c60;   /* muted / captions */
  --rule:       #d9d3c6;   /* hairline rules */
  --rule-2:     #c7c0b0;
  --accent:     #0046db;   /* Arvelos blue (from the A/V logo) */
  --accent-ink: #00329e;   /* accent, darker for text on paper */
  --ok:         #3f6b34;   /* restrained green for positive status */

  --measure: 66ch;
  --gutter: clamp(1.25rem, 5vw, 4rem);
  --maxw: 1120px;

  --font-display: "Fraunces", Georgia, "Times New Roman", serif;
  --font-body: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:   #16150f;
    --paper-2: #1e1c15;
    --ink:     #efe9dc;
    --ink-2:   #c4bdac;
    --ink-3:   #8f897a;
    --rule:    #322f25;
    --rule-2:  #423e30;
    --accent:  #3d8bff;
    --accent-ink: #5c9dff;
    --ok:      #86b06f;
  }
}

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

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

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  font-feature-settings: "kern" 1;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* subtle paper grain via a single tiled radial — no external asset */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: .5;
  background-image: radial-gradient(var(--rule) 0.5px, transparent 0.5px);
  background-size: 22px 22px;
  mix-blend-mode: multiply;
}
@media (prefers-color-scheme: dark) { body::before { mix-blend-mode: screen; opacity: .25; } }

a { color: inherit; text-decoration: none; }

::selection { background: var(--accent); color: var(--paper); }

/* ---------- layout ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); position: relative; z-index: 1; }
.site { flex: 1 0 auto; }

/* ---------- masthead ---------- */
.masthead {
  border-bottom: 1px solid var(--rule);
}
.masthead .wrap {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
  padding-block: 1.15rem;
  flex-wrap: wrap;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.28rem;
  letter-spacing: .01em;
}
.brand .mark { display: inline-block; width: auto; }
.brand b { font-weight: 600; }
.brand span { color: var(--ink-3); font-weight: 400; }

.nav {
  display: flex;
  gap: 1.4rem;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.nav a { color: var(--ink-2); padding-bottom: 2px; border-bottom: 1px solid transparent; transition: border-color .15s, color .15s; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); border-color: var(--accent); }

/* ---------- meta label ---------- */
.meta {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.meta .dot { color: var(--accent); }

/* ---------- hero / section ---------- */
.lede {
  padding-block: clamp(3rem, 9vw, 6.5rem) clamp(2.5rem, 6vw, 4rem);
  border-bottom: 1px solid var(--rule);
}
h1.headline {
  font-family: var(--font-display);
  font-weight: 400;
  font-optical-sizing: auto;
  font-size: clamp(2.3rem, 6.4vw, 4.4rem);
  line-height: 1.04;
  letter-spacing: -0.015em;
  max-width: 18ch;
  text-wrap: balance;
}
h1.headline em { font-style: italic; color: var(--accent-ink); }
.lede p.sub {
  margin-top: 1.6rem;
  max-width: var(--measure);
  font-size: clamp(1.05rem, 2.2vw, 1.22rem);
  color: var(--ink-2);
}
.lede .meta { margin-bottom: 1.4rem; }

section { padding-block: clamp(2.75rem, 6vw, 4.25rem); }
section + section { border-top: 1px solid var(--rule); }

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}
h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.5rem, 3.2vw, 2.05rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
}
h3 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.28rem;
  line-height: 1.2;
}
p { max-width: var(--measure); }
p + p { margin-top: 1rem; }
.prose p, .prose li { color: var(--ink-2); }
.prose h2, .prose h3 { color: var(--ink); margin-top: 2.4rem; margin-bottom: .8rem; }
.prose h2:first-child, .prose h3:first-child { margin-top: 0; }
.prose ul { margin: 1rem 0; padding-left: 1.1rem; max-width: var(--measure); }
.prose li { margin: .4rem 0; }
.prose strong { color: var(--ink); font-weight: 600; }
.prose a { color: var(--accent-ink); border-bottom: 1px solid var(--rule-2); }
.prose a:hover { border-color: var(--accent); }

/* ---------- catalog (products index) ---------- */
.catalog { border-top: 1px solid var(--ink); }
.entry {
  display: grid;
  grid-template-columns: 3.5rem 1fr auto;
  gap: 1.5rem;
  align-items: start;
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--rule);
  transition: background .15s;
}
.entry:hover { background: var(--paper-2); }
.entry .idx { font-family: var(--font-mono); font-size: .8rem; color: var(--ink-3); padding-top: .35rem; }
.entry .body h3 { display: inline-flex; align-items: center; gap: .55rem; }
.entry .body h3 .arrow { color: var(--accent); transition: transform .15s; }
.entry:hover .body h3 .arrow { transform: translateX(3px); }
.entry .body p { margin-top: .4rem; color: var(--ink-2); font-size: .98rem; max-width: 52ch; }
.entry .status {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-3);
  white-space: nowrap;
  padding-top: .4rem;
}
.entry .status .pip { display: inline-block; width: .5rem; height: .5rem; background: var(--accent); margin-right: .45rem; vertical-align: middle; }
.entry .status.ok .pip { background: var(--ok); }

/* ---------- principles / numbered steps ---------- */
.cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 2rem 2.5rem;
}
.col .meta { margin-bottom: .7rem; }
.col h3 { margin-bottom: .5rem; }
.col p { color: var(--ink-2); font-size: .96rem; }

.steps { counter-reset: step; display: grid; gap: 0; max-width: 760px; }
.step {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 1.25rem;
  padding: 1.25rem 0;
  border-top: 1px solid var(--rule);
}
.step:last-child { border-bottom: 1px solid var(--rule); }
.step::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: .8rem;
  color: var(--accent);
  padding-top: .2rem;
}
.step h3 { font-size: 1.1rem; margin-bottom: .3rem; }
.step p { color: var(--ink-2); font-size: .96rem; margin: 0; }

/* ---------- honesty panel ---------- */
.panel {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  padding: clamp(1.5rem, 4vw, 2.25rem);
}
.panel h3 { margin-bottom: 1rem; }
.panel .grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem 2.5rem; }
@media (max-width: 620px) { .panel .grid2 { grid-template-columns: 1fr; } }
.panel .grid2 > div > .meta { margin-bottom: .6rem; }
.panel ul { list-style: none; padding: 0; }
.panel li { padding: .3rem 0 .3rem 1.4rem; position: relative; color: var(--ink-2); font-size: .95rem; }
.panel li::before { content: ""; position: absolute; left: 0; top: .8em; width: .7rem; height: 1px; background: var(--accent); }
.panel li.no::before { background: var(--ink-3); }

/* ---------- CTA row ---------- */
.cta { display: flex; align-items: center; gap: 1.5rem 2rem; flex-wrap: wrap; margin-top: 2rem; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  padding: .8rem 1.2rem;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  transition: background .15s, color .15s;
}
.btn:hover { background: var(--accent); border-color: var(--accent); color: #fff; }
.link-arrow { color: var(--accent-ink); border-bottom: 1px solid var(--rule-2); padding-bottom: 2px; font-weight: 500; }
.link-arrow:hover { border-color: var(--accent); }

/* ---------- footer ---------- */
.foot {
  flex-shrink: 0;
  border-top: 1px solid var(--ink);
  padding-block: 2.5rem 3rem;
  margin-top: clamp(3rem, 8vw, 6rem);
}
.foot .wrap { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 2rem; }
@media (max-width: 640px) { .foot .wrap { grid-template-columns: 1fr 1fr; } }
.foot .about { max-width: 34ch; }
.foot .about p { color: var(--ink-3); font-size: .9rem; margin-top: .8rem; }
.foot nav { display: flex; flex-direction: column; gap: .55rem; }
.foot nav .meta { margin-bottom: .4rem; }
.foot nav a { color: var(--ink-2); font-size: .95rem; width: fit-content; border-bottom: 1px solid transparent; }
.foot nav a:hover { color: var(--ink); border-color: var(--accent); }
.foot .colophon { grid-column: 1 / -1; margin-top: 1.5rem; padding-top: 1.5rem; border-top: 1px solid var(--rule); color: var(--ink-3); font-family: var(--font-mono); font-size: .72rem; letter-spacing: .04em; display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }

/* ---------- breadcrumb ---------- */
.crumb { padding-top: 1.5rem; }
.crumb a { color: var(--ink-3); font-family: var(--font-mono); font-size: .74rem; letter-spacing: .06em; text-transform: uppercase; }
.crumb a:hover { color: var(--accent-ink); }

/* ---------- load animation ---------- */
@media (prefers-reduced-motion: no-preference) {
  .reveal > * { opacity: 0; transform: translateY(10px); animation: rise .7s cubic-bezier(.2,.7,.2,1) forwards; }
  .reveal > *:nth-child(1) { animation-delay: .05s; }
  .reveal > *:nth-child(2) { animation-delay: .16s; }
  .reveal > *:nth-child(3) { animation-delay: .27s; }
  .reveal > *:nth-child(4) { animation-delay: .38s; }
  @keyframes rise { to { opacity: 1; transform: none; } }
}

/* ---------- responsive ---------- */
@media (max-width: 560px) {
  body { font-size: 16px; }
  .entry { grid-template-columns: 1fr; gap: .5rem; }
  .entry .idx { padding-top: 0; }
  .entry .status { padding-top: 0; }
  .masthead .wrap { padding-block: 1rem; }
  .nav { gap: 1rem; }
}