/* ============================================================
   ZACHLUKE.COM: CORE DESIGN SYSTEM
   Black / white. Disciplined. No ornament without function.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Archivo+Black&family=Arial&display=swap');

:root {
  /* color */
  --black: #000000;
  --white: #ffffff;
  --grey-1: #b3b3b3;   /* body copy on black */
  --grey-2: #808080;   /* tertiary / meta */
  --grey-3: #4d4d4d;   /* hairlines, disabled */
  --grey-border: #2a2a2a;

  /* type */
  --font-display: 'Archivo Black', 'Arial Black', Arial, sans-serif;
  --font-body: Arial, Helvetica, sans-serif;

  /* layout */
  --frame-margin: 32px;
  --frame-border: 5px;
  --sidebar-width: 220px;
  --content-max: 1180px;
  --gap: 24px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--black);
  color: var(--white);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }

/* ---------- outer frame ---------- */
.zl-frame {
  margin: var(--frame-margin);
  border: var(--frame-border) solid var(--white);
  min-height: calc(100vh - (var(--frame-margin) * 2));
  display: grid;
  grid-template-columns: var(--sidebar-width) var(--frame-border) 1fr;
}

@media (max-width: 860px) {
  :root { --frame-margin: 12px; --frame-border: 3px; }
  .zl-frame {
    grid-template-columns: 1fr;
  }
}

/* ---------- sidebar ---------- */
.zl-sidebar {
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
}

.zl-mark {
  font-family: var(--font-display);
  font-size: 28px;
  letter-spacing: 0.02em;
  margin-bottom: 56px;
}

.zl-nav {
  display: flex;
  flex-direction: column;
  gap: 22px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.zl-nav a {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--grey-1);
  transition: color 0.15s ease;
}

.zl-nav a:hover,
.zl-nav a:focus-visible {
  color: var(--white);
}

.zl-nav a.is-active {
  color: var(--white);
  position: relative;
}

.zl-nav a.is-active::before {
  content: '';
  position: absolute;
  left: -16px;
  top: 50%;
  width: 6px;
  height: 6px;
  background: var(--white);
  transform: translateY(-50%);
}

.zl-sidebar-divider {
  background: var(--white);
}

@media (max-width: 860px) {
  .zl-sidebar-divider { display: none; }
  .zl-sidebar {
    border-bottom: var(--frame-border) solid var(--white);
    padding: 24px 24px;
  }
  .zl-mark { margin-bottom: 24px; }
  .zl-nav { flex-direction: row; flex-wrap: wrap; gap: 16px 20px; }
  .zl-nav a.is-active::before {
    left: 0;
    top: auto;
    bottom: -8px;
    width: 100%;
    height: 2px;
    transform: none;
  }
}

/* ---------- main content column ---------- */
.zl-main {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.zl-section {
  padding: 64px 56px;
  border-bottom: var(--frame-border) solid var(--white);
}

.zl-section:last-child { border-bottom: none; }

@media (max-width: 860px) {
  .zl-section { padding: 40px 24px; }
}

/* ---------- page header block (used on every subpage) ---------- */
.zl-page-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 32px;
  flex-wrap: wrap;
}

.zl-page-crest {
  width: 44px;
  height: 44px;
  color: var(--grey-1);
  fill: currentColor;
  margin: 0 0 22px;
}

.zl-page-eyebrow {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--grey-2);
  margin: 0 0 16px;
}

.zl-page-title {
  font-family: var(--font-display);
  font-size: clamp(40px, 6vw, 72px);
  line-height: 1.02;
  margin: 0;
  letter-spacing: -0.01em;
}

.zl-page-sub {
  font-size: 15px;
  line-height: 1.6;
  color: var(--grey-1);
  max-width: 60ch;
  margin: 20px 0 0;
}

.zl-page-italic {
  font-style: italic;
  font-size: 14px;
  color: var(--grey-2);
  margin: 8px 0 0;
}

/* ---------- rule / divider ---------- */
.zl-rule {
  width: 64px;
  height: 3px;
  background: var(--white);
  margin: 24px 0;
  border: none;
}

/* ---------- typography helpers ---------- */
.zl-h1 {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 56px);
  line-height: 1.05;
  margin: 0;
}

.zl-h2 {
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.1;
  margin: 0 0 20px;
}

.zl-h3 {
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--grey-1);
  margin: 0 0 16px;
  text-transform: uppercase;
}

.zl-body {
  font-size: 15px;
  line-height: 1.7;
  color: var(--grey-1);
  max-width: 68ch;
  margin: 0 0 20px;
}

.zl-body:last-child { margin-bottom: 0; }

.zl-lede {
  font-size: 18px;
  line-height: 1.6;
  color: var(--white);
  max-width: 62ch;
  margin: 0 0 20px;
}

.zl-pullquote {
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.25;
  margin: 32px 0;
  max-width: 56ch;
  text-transform: uppercase;
}

.zl-meta {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--grey-2);
}

/* ---------- numbered list / discipline rows ---------- */
.zl-row-list {
  display: flex;
  flex-direction: column;
}

.zl-row {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 24px;
  padding: 22px 0;
  border-top: 1px solid var(--grey-border);
}

.zl-row:first-child { border-top: none; }

.zl-row-label {
  font-family: var(--font-display);
  font-size: 16px;
  letter-spacing: 0.02em;
}

.zl-row-body {
  font-size: 15px;
  line-height: 1.6;
  color: var(--grey-1);
  margin: 0;
}

@media (max-width: 600px) {
  .zl-row { grid-template-columns: 1fr; gap: 8px; }
}

/* ---------- card grid (section grid pattern from homepage) ---------- */
.zl-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.zl-card {
  padding: 28px 24px;
  border-right: var(--frame-border) solid var(--white);
  border-bottom: var(--frame-border) solid var(--white);
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: background 0.15s ease;
}

.zl-card:hover { background: #0a0a0a; }
.zl-card:last-child { border-right: none; }

.zl-card-num {
  font-size: 13px;
  color: var(--grey-2);
}

.zl-card-title {
  font-family: var(--font-display);
  font-size: 17px;
}

.zl-card-desc {
  font-size: 13px;
  line-height: 1.5;
  color: var(--grey-1);
  margin: 0;
}

/* ---------- tag filter pills (Creative spaces of activation) ---------- */
.zl-tag-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  border: var(--frame-border) solid var(--white);
  border-right: none;
  border-bottom: none;
}

.zl-tag {
  background: var(--black);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  border-right: var(--frame-border) solid var(--white);
  border-bottom: var(--frame-border) solid var(--white);
}

.zl-tag-name {
  font-size: 14px;
  font-weight: bold;
  letter-spacing: 0.02em;
}

.zl-tag-desc {
  font-size: 12.5px;
  color: var(--grey-2);
  line-height: 1.5;
}

/* ---------- buttons / CTA ---------- */
.zl-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--grey-2);
  padding: 16px 28px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--grey-1);
  align-self: flex-start;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.zl-btn:hover,
.zl-btn:focus-visible {
  border-color: var(--white);
  color: var(--white);
}

.zl-link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--white);
  border-bottom: 1px solid var(--grey-3);
  padding-bottom: 4px;
  align-self: flex-start;
  transition: border-color 0.15s ease;
}

.zl-link-arrow:hover { border-color: var(--white); }

/* ---------- list feed (writing / archive list rows) ---------- */
.zl-feed {
  display: flex;
  flex-direction: column;
}

.zl-feed-item {
  display: grid;
  grid-template-columns: 100px 1fr auto;
  align-items: baseline;
  gap: 24px;
  padding: 24px 0;
  border-top: 1px solid var(--grey-border);
}

.zl-feed-item:first-child { border-top: none; }

.zl-feed-date {
  font-size: 12px;
  color: var(--grey-2);
}

.zl-feed-title {
  font-family: var(--font-display);
  font-size: 18px;
  margin: 0 0 6px;
}

.zl-feed-sub {
  font-size: 13px;
  color: var(--grey-1);
  margin: 0;
}

.zl-feed-arrow {
  color: var(--grey-2);
  font-size: 18px;
}

.zl-feed-item:hover .zl-feed-title,
.zl-feed-item:hover .zl-feed-arrow {
  color: var(--white);
}

@media (max-width: 700px) {
  .zl-feed-item { grid-template-columns: 1fr; gap: 6px; }
  .zl-feed-arrow { display: none; }
}

/* ---------- footer (shared, matches homepage exactly) ---------- */
.zl-footer {
  padding: 40px 56px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 32px;
  flex-wrap: wrap;
}

.zl-footer-mark {
  font-family: var(--font-display);
  font-size: 22px;
}

.zl-footer-coords {
  font-size: 13px;
  color: var(--grey-1);
  line-height: 1.5;
}

.zl-footer-coords strong { display: block; color: var(--white); }

.zl-footer-mission {
  font-size: 13px;
  color: var(--grey-1);
  line-height: 1.6;
  max-width: 32ch;
}

.zl-footer-social {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 13px;
  font-weight: bold;
  letter-spacing: 0.04em;
}

.zl-footer-social a:hover { color: var(--grey-1); }

.zl-footer-legal {
  width: 100%;
  border-top: 1px solid var(--grey-border);
  margin-top: 24px;
  padding-top: 20px;
  font-size: 11px;
  color: var(--grey-3);
  letter-spacing: 0.04em;
}

@media (max-width: 860px) {
  .zl-footer { padding: 32px 24px; }
}

/* ---------- breadcrumb / back link ---------- */
.zl-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--grey-2);
  margin-bottom: 32px;
}

.zl-back:hover { color: var(--white); }

/* ---------- closing statement block ---------- */
.zl-closing {
  font-family: var(--font-display);
  font-size: clamp(22px, 3.2vw, 36px);
  line-height: 1.3;
  text-align: center;
  padding: 24px 0;
  text-transform: uppercase;
}

/* ---------- archive case study disclaimer ---------- */
.zl-disclaimer {
  border-left: 2px solid var(--grey-3);
  padding: 16px 20px;
  margin: 24px 0 0;
  background: #0a0a0a;
}

.zl-disclaimer p {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--grey-2);
  margin: 0;
  max-width: 70ch;
}

.zl-disclaimer p strong {
  color: var(--grey-1);
}

/* ---------- placeholder / coming soon ---------- */
.zl-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px;
  gap: 20px;
}