/* K-AI Lab — LP Stylesheet */

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

:root {
  --ink: #1a1a18;
  --paper: #f7f5f0;
  --rule: #c8c4bc;
  --muted: #7a7870;
  --warm: #eeece7;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: 'Libre Baskerville', serif;
  line-height: 1.7;
}

/* ── Header ── */
header {
  border-top: 5px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  padding: 1.4rem 2.5rem 1rem;
  max-width: 860px;
  margin: 0 auto;
  text-align: center;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  justify-content: center;
}

.masthead {
  font-family: 'Shippori Mincho', serif;
  font-weight: 700;
  font-size: 2.2rem;
  letter-spacing: 0.04em;
  color: var(--ink);
}

.logo {
  height: 52px;
  width: auto;
  display: block;
}

.header-right {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.issue {
  font-family: 'DM Mono', monospace;
  font-size: 0.63rem;
  color: var(--muted);
  letter-spacing: 0.08em;
  border-top: 0.5px solid var(--rule);
  padding-top: 0.6rem;
}

.lang-btn {
  font-family: 'DM Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  padding: 0.25rem 0.65rem;
  cursor: pointer;
  text-transform: uppercase;
  transition: background 0.15s, color 0.15s;
}

.lang-btn:hover {
  background: var(--ink);
  color: var(--paper);
}

/* ── Rules ── */
.rule2 {
  border: none;
  border-top: 2px solid var(--ink);
  margin: 0 2.5rem;
}

.rule1 {
  border: none;
  border-top: 0.5px solid var(--rule);
  margin: 0 2.5rem;
}

/* ── Hero ── */
.hero {
  padding: 3.5rem 2.5rem 2.5rem;
  max-width: 860px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 3rem;
  align-items: start;
}

.kicker {
  font-family: 'DM Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  border-top: 2px solid var(--ink);
  padding-top: 0.6rem;
  margin-bottom: 1rem;
  display: inline-block;
}

.hero h1 {
  font-family: 'Shippori Mincho', serif;
  font-weight: 700;
  font-size: 4.5rem;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 1.5rem;
}

.hero-deck {
  font-size: 0.92rem;
  line-height: 1.9;
  color: var(--muted);
  font-style: italic;
}

/* ── Sidebar ── */
.sidebar {
  border-left: 2px solid var(--ink);
  padding-left: 1.5rem;
}

.sl {
  font-family: 'DM Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1rem;
}

.si {
  padding: 0.75rem 0;
  border-bottom: 0.5px solid var(--rule);
}

.si:last-child {
  border-bottom: none;
}

.si h3 {
  font-family: 'Shippori Mincho', serif;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 0.2rem;
  color: var(--ink);
}

.si p {
  font-size: 0.78rem;
  color: var(--muted);
  line-height: 1.6;
  font-style: italic;
}

/* ── Byline bar — inverted ── */
.byline {
  background: var(--ink);
  padding: 1.4rem 2.5rem;
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  gap: 3rem;
  flex-wrap: wrap;
}

.bi .bn {
  font-family: 'Shippori Mincho', serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--paper);
}

.bi .bl {
  font-family: 'DM Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--rule);
}

/* ── Pull quote ── */
.pq {
  padding: 3rem 2.5rem;
  max-width: 860px;
  margin: 0 auto;
  text-align: center;
  border-top: 3px solid var(--ink);
  border-bottom: 3px solid var(--ink);
  background: var(--warm);
}

.pq p {
  font-family: 'Shippori Mincho', serif;
  font-size: 2rem;
  line-height: 1.55;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.pq cite {
  display: block;
  font-family: 'DM Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 1.2rem;
  font-style: normal;
}

/* ── Body sections ── */
.bs {
  padding: 2.2rem 2.5rem;
  max-width: 860px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 2.5rem;
  align-items: start;
}

.bn2 {
  font-family: 'DM Mono', monospace;
  font-size: 2.5rem;
  color: var(--rule);
  line-height: 1;
  font-weight: 500;
}

.bc h2 {
  font-family: 'Shippori Mincho', serif;
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  color: var(--ink);
  padding-bottom: 0.5rem;
  border-bottom: 0.5px solid var(--rule);
}

.bc p {
  font-size: 0.87rem;
  line-height: 1.95;
  color: var(--muted);
}

.tags {
  margin-top: 1rem;
}

.tag {
  display: inline-block;
  font-family: 'DM Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid var(--ink);
  padding: 0.2rem 0.6rem;
  margin-right: 0.4rem;
  margin-bottom: 0.6rem;
  color: var(--ink);
}

/* ── Contact strip ── */
.cs {
  padding: 3rem 2.5rem;
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.ct h2 {
  font-family: 'Shippori Mincho', serif;
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
  color: var(--ink);
}

.ct p {
  font-size: 0.82rem;
  color: var(--muted);
  font-style: italic;
}

.ct a {
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
  color: var(--ink);
  text-decoration: underline;
  display: block;
  margin-top: 0.4rem;
}

.ca {
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  border: 2px solid var(--ink);
  padding: 0.9rem 2rem;
  background: var(--ink);
  color: var(--paper);
  cursor: pointer;
  text-transform: uppercase;
  text-decoration: none;
  white-space: nowrap;
}

.ca:hover {
  background: var(--paper);
  color: var(--ink);
}

/* ── Footer ── */
footer {
  border-top: 2px solid var(--ink);
  border-bottom: 5px solid var(--ink);
  padding: 1.2rem 2.5rem;
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

footer .logo {
  height: 36px;
}

footer .masthead {
  font-size: 1rem;
}

footer p {
  font-family: 'DM Mono', monospace;
  font-size: 0.65rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}

/* ── Label variant for bn2 ── */
.bn-label {
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  padding-top: 0.4rem;
  font-weight: 400;
}

/* ── Problem list ── */
.problem-list {
  list-style: none;
  margin-top: 1rem;
}

.problem-list li {
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--ink);
  padding: 0.65rem 0 0.65rem 1.4rem;
  border-bottom: 0.5px solid var(--rule);
  position: relative;
}

.problem-list li:last-child {
  border-bottom: none;
}

.problem-list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--rule);
}

/* ── Section label ── */
.section-label {
  padding: 2rem 2.5rem 0;
  max-width: 860px;
  margin: 0 auto;
}

.section-label .kicker {
  border-top: none;
  padding-top: 0;
}

/* ── Vision / Flowchart ── */
.vision {
  padding: 2.5rem 2.5rem;
  max-width: 860px;
  margin: 0 auto;
}

.vision-header {
  margin-bottom: 2rem;
}

.vision-header .kicker {
  border-top: none;
  padding-top: 0;
}

.vision-header h2 {
  font-family: 'Shippori Mincho', serif;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--ink);
  margin-top: 0.5rem;
}

.flow {
  display: flex;
  align-items: stretch;
  gap: 0;
}

.flow-step {
  flex: 1;
  border: 2px solid var(--ink);
  padding: 1.8rem 1rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.flow-step + .flow-step {
  border-left: none;
}

.flow-step--goal {
  background: var(--ink);
}

.flow-step--goal .flow-place,
.flow-step--goal .flow-desc {
  color: var(--paper);
}

.flow-place {
  font-family: 'Shippori Mincho', serif;
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--ink);
  line-height: 1;
}

.flow-desc {
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  line-height: 1.5;
}

.flow-arrow {
  display: none;
}

/* ── Responsive ── */
@media (max-width: 640px) {
  header {
    padding: 1rem 1.2rem 0.8rem;
  }

  .masthead {
    font-size: 1.6rem;
  }

  .logo {
    height: 40px;
  }

  .issue {
    font-size: 0.58rem;
  }

  .hero {
    grid-template-columns: 1fr;
    padding: 2rem 1.2rem 1.5rem;
  }

  .hero h1 {
    font-size: 2.8rem;
  }

  .sidebar {
    border-left: none;
    border-top: 2px solid var(--ink);
    padding-left: 0;
    padding-top: 1rem;
    margin-top: 1rem;
  }

  .rule1, .rule2 {
    margin: 0 1.2rem;
  }

  .byline {
    padding: 1rem 1.2rem;
    gap: 1.5rem;
  }

  .bi .bn {
    font-size: 1.2rem;
  }

  .pq {
    padding: 2rem 1.2rem;
  }

  .pq p {
    font-size: 1.4rem;
  }

  .bs {
    grid-template-columns: 1fr;
    padding: 1.5rem 1.2rem;
    gap: 0.5rem;
  }

  .bn2 {
    font-size: 1.4rem;
  }

  .section-label {
    padding: 1.5rem 1.2rem 0;
  }

  .vision {
    padding: 2rem 1.2rem;
  }

  .vision-header h2 {
    font-size: 1.3rem;
  }

  .flow {
    flex-direction: column;
  }

  .flow-step + .flow-step {
    border-left: 2px solid var(--ink);
    border-top: none;
  }

  .cs {
    padding: 2rem 1.2rem;
    flex-direction: column;
    align-items: flex-start;
  }

  .ca {
    width: 100%;
    text-align: center;
  }

  footer {
    padding: 1rem 1.2rem;
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
  }

  footer .logo {
    height: 32px;
  }
}