/* ============================================================
   CATLAXY AI — Site CSS (Brutalist-Modern)
   Design System v1.0 — derived from Practice Notes #1
   Namespace: .pn-* (won't collide with legacy site styles)
   ============================================================ */

:root {
  /* color */
  --pn-brand-blue: #0078FC;
  --pn-brand-blue-50: #E6F0FF;
  --pn-brand-blue-strong: #0064D4;
  --pn-brand-yellow: #FBBF24;
  --pn-brand-rose: #E8175D;
  --pn-text-primary: #111827;
  --pn-text-secondary: #4B5563;
  --pn-text-tertiary: #6B7280;
  --pn-text-inverse: #FFFFFF;
  --pn-bg-page: #FFFFFF;
  --pn-bg-soft: #F9FAFB;
  --pn-bg-soft-2: #F3F4F6;
  --pn-bg-dark: #111827;
  --pn-border-default: #E5E7EB;
  --pn-border-hard: #111827;

  /* type */
  --pn-font-sans: 'Inter','Noto Sans SC','PingFang SC',-apple-system,BlinkMacSystemFont,sans-serif;
  --pn-font-mono: 'JetBrains Mono','SF Mono',Menlo,Consolas,monospace;

  /* shadow */
  --pn-shadow-soft: 3px 3px 0 0 rgba(17, 24, 39, 0.18);
  --pn-shadow-strong: 5px 5px 0 0 #111827;
  --pn-shadow-blue: 5px 5px 0 0 var(--pn-brand-blue);

  /* shape */
  --pn-radius: 4px;
  --pn-radius-lg: 8px;
}

* , *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--pn-font-sans);
  background: var(--pn-bg-page);
  color: var(--pn-text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

.pn-container { max-width: 1200px; margin: 0 auto; padding: 0 32px; }

/* ============================================================
   01 · TOPNAV
   ============================================================ */
.pn-nav {
  background: var(--pn-bg-page);
  border-bottom: 2px solid var(--pn-border-hard);
  position: sticky; top: 0; z-index: 50;
  height: 64px;
}
.pn-nav__inner { max-width: 1200px; margin: 0 auto; padding: 0 32px; height: 100%; display: flex; align-items: center; gap: 32px; }
.pn-nav__brand { display: flex; align-items: center; gap: 8px; }
.pn-nav__logo { height: 28px; width: auto; }
.pn-nav__links { display: flex; align-items: center; gap: 28px; flex: 1; }
.pn-nav__link {
  font-family: var(--pn-font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--pn-text-primary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  position: relative;
  padding: 4px 0;
  transition: color .15s;
}
.pn-nav__link:hover { color: var(--pn-brand-blue); }
.pn-nav__link.is-active { color: var(--pn-brand-blue); }
.pn-nav__link.is-active::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: -22px;
  height: 3px; background: var(--pn-brand-blue);
}
.pn-nav__right { display: flex; align-items: center; gap: 16px; margin-left: auto; }
.pn-nav__en {
  font-family: var(--pn-font-mono); font-size: 11px; font-weight: 700; letter-spacing: 0.1em;
  color: var(--pn-text-secondary); padding: 4px 8px; border: 1px solid var(--pn-border-default); border-radius: 3px;
}
.pn-nav__en:hover { color: var(--pn-brand-blue); border-color: var(--pn-brand-blue); }

/* ============================================================
   02 · BUTTONS
   ============================================================ */
.pn-btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--pn-font-sans); font-size: 14px; font-weight: 800;
  letter-spacing: 0.01em;
  padding: 12px 22px;
  border: 2px solid var(--pn-border-hard);
  border-radius: var(--pn-radius);
  cursor: pointer;
  transition: transform .12s, box-shadow .12s;
  text-decoration: none;
}
.pn-btn--primary {
  background: var(--pn-brand-blue); color: var(--pn-text-inverse);
  box-shadow: 4px 4px 0 0 var(--pn-border-hard);
}
.pn-btn--primary:hover { transform: translate(-2px, -2px); box-shadow: 6px 6px 0 0 var(--pn-border-hard); }
.pn-btn--primary:active { transform: translate(0, 0); box-shadow: 2px 2px 0 0 var(--pn-border-hard); }
.pn-btn--ghost {
  background: var(--pn-bg-page); color: var(--pn-text-primary);
  box-shadow: 4px 4px 0 0 var(--pn-border-hard);
}
.pn-btn--ghost:hover { transform: translate(-2px, -2px); box-shadow: 6px 6px 0 0 var(--pn-border-hard); }
.pn-btn--ghost:active { transform: translate(0, 0); box-shadow: 2px 2px 0 0 var(--pn-border-hard); }
.pn-btn--inverse {
  background: var(--pn-bg-page); color: var(--pn-text-primary);
  box-shadow: 4px 4px 0 0 rgba(255,255,255,0.4);
  border-color: var(--pn-bg-page);
}
.pn-btn--small { padding: 8px 14px; font-size: 13px; }
.pn-btn__arrow { font-weight: 800; }

/* ============================================================
   03 · SECTION
   ============================================================ */
.pn-section { padding: 96px 0; }
.pn-section--soft { background: var(--pn-bg-soft); }
.pn-section--soft-2 { background: var(--pn-bg-soft-2); }
.pn-section--dark { background: var(--pn-bg-dark); color: var(--pn-text-inverse); }
.pn-section__head { margin: 0 0 48px; max-width: 820px; }
.pn-section__eyebrow {
  font-family: var(--pn-font-mono); font-size: 12px; font-weight: 700;
  color: var(--pn-brand-blue); letter-spacing: 0.16em; text-transform: uppercase;
  margin: 0 0 16px;
  display: inline-flex; align-items: center; gap: 10px;
}
.pn-section__eyebrow::before { content: ''; display: inline-block; width: 24px; height: 2px; background: var(--pn-brand-blue); }
.pn-section__title { font-size: 44px; font-weight: 900; color: var(--pn-text-primary); line-height: 1.15; letter-spacing: -0.025em; margin: 0 0 16px; }
.pn-section--dark .pn-section__title { color: var(--pn-text-inverse); }
.pn-section__sub { font-size: 17px; color: var(--pn-text-secondary); line-height: 1.7; margin: 0; }
.pn-section--dark .pn-section__sub { color: rgba(255,255,255,0.72); }

/* ============================================================
   04 · HERO
   ============================================================ */
.pn-hero { padding: 96px 0 80px; border-bottom: 2px solid var(--pn-border-hard); position: relative; overflow: hidden; }
.pn-hero__inner { max-width: 1200px; margin: 0 auto; padding: 0 32px; position: relative; z-index: 1; }
.pn-hero__eyebrow {
  font-family: var(--pn-font-mono); font-size: 12px; font-weight: 700;
  color: var(--pn-brand-blue); letter-spacing: 0.2em; text-transform: uppercase;
  margin: 0 0 28px;
  display: inline-flex; align-items: center; gap: 10px;
}
.pn-hero__eyebrow::before { content: ''; display: inline-block; width: 32px; height: 2px; background: var(--pn-brand-blue); }
.pn-hero__title {
  font-size: 72px; font-weight: 900; line-height: 1.05; color: var(--pn-text-primary);
  letter-spacing: -0.035em; margin: 0 0 24px; max-width: 1000px;
}
.pn-hero__title em { font-style: normal; color: var(--pn-brand-blue); }
.pn-hero__lead { font-size: 19px; line-height: 1.65; color: var(--pn-text-secondary); margin: 0 0 40px; max-width: 720px; }
.pn-hero__ctas { display: flex; gap: 16px; flex-wrap: wrap; margin: 0 0 64px; }

.pn-hero__metrics {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 0;
  border: 2px solid var(--pn-border-hard); border-radius: var(--pn-radius);
  background: var(--pn-bg-page); box-shadow: var(--pn-shadow-strong);
  max-width: 920px;
}
.pn-metric { padding: 28px 32px; border-right: 2px solid var(--pn-border-hard); }
.pn-metric:last-child { border-right: 0; }
.pn-metric__num {
  font-family: var(--pn-font-mono); font-size: 40px; font-weight: 900;
  color: var(--pn-brand-blue); line-height: 1; letter-spacing: -0.03em;
}
.pn-metric__num .unit { font-size: 22px; margin-left: 4px; }
.pn-metric__label {
  font-family: var(--pn-font-mono); font-size: 11px; font-weight: 700;
  color: var(--pn-text-tertiary); letter-spacing: 0.12em; text-transform: uppercase;
  margin-top: 10px;
}

/* hero ornament — subtle grid background */
.pn-hero__grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, rgba(0,120,252,0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0,120,252,0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

/* ============================================================
   04.5 · THESIS BANNER (Featured Practice Notes)
   ============================================================ */
.pn-thesis { padding: 64px 0; background: var(--pn-bg-page); border-bottom: 2px solid var(--pn-border-hard); }
.pn-thesis-card {
  display: grid; grid-template-columns: 2fr 1fr; gap: 0;
  border: 2px solid var(--pn-border-hard); border-radius: var(--pn-radius);
  background: var(--pn-bg-page); box-shadow: var(--pn-shadow-strong);
  overflow: hidden;
}
.pn-thesis-card__left { padding: 48px 52px; }
.pn-thesis-card__chip {
  font-family: var(--pn-font-mono); font-size: 11px; font-weight: 700;
  color: var(--pn-brand-blue); letter-spacing: 0.18em; text-transform: uppercase;
  margin: 0 0 20px;
  display: inline-flex; align-items: center; gap: 10px;
}
.pn-thesis-card__chip::before { content: ''; width: 24px; height: 2px; background: var(--pn-brand-blue); display: inline-block; }
.pn-thesis-card__chip-new {
  background: var(--pn-brand-yellow); color: var(--pn-text-primary);
  padding: 2px 8px; border-radius: 3px; letter-spacing: 0.12em;
}
.pn-thesis-card__title {
  font-size: 40px; font-weight: 900; line-height: 1.15; color: var(--pn-text-primary);
  letter-spacing: -0.02em; margin: 0 0 20px;
}
.pn-thesis-card__title em { font-style: normal; color: var(--pn-brand-blue); border-bottom: 4px solid var(--pn-brand-yellow); padding-bottom: 1px; }
.pn-thesis-card__lead { font-size: 16px; color: var(--pn-text-secondary); line-height: 1.7; margin: 0 0 28px; max-width: 580px; }
.pn-thesis-card__right {
  background: var(--pn-brand-blue); color: var(--pn-text-inverse);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 48px 32px; border-left: 2px solid var(--pn-border-hard);
  position: relative; overflow: hidden;
}
.pn-thesis-card__right::before {
  content: ''; position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.08) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.08) 1px, transparent 1px);
  background-size: 32px 32px;
}
.pn-thesis-card__num {
  font-family: var(--pn-font-mono); font-size: 140px; font-weight: 900;
  color: var(--pn-text-inverse); line-height: 0.9; letter-spacing: -0.05em;
  position: relative; z-index: 1;
  -webkit-text-stroke: 2px var(--pn-brand-yellow);
  -webkit-text-fill-color: transparent;
}
.pn-thesis-card__series {
  font-family: var(--pn-font-mono); font-size: 13px; font-weight: 700;
  color: var(--pn-brand-yellow); letter-spacing: 0.2em; text-transform: uppercase;
  margin-top: 16px; text-align: center; line-height: 1.4;
  position: relative; z-index: 1;
}
.pn-thesis-card__more {
  font-family: var(--pn-font-mono); font-size: 11px; font-weight: 700;
  color: rgba(255,255,255,0.7); letter-spacing: 0.16em; text-transform: uppercase;
  margin-top: 24px; position: relative; z-index: 1;
}

/* ============================================================
   05 · PRODUCT CARDS (large 2-col)
   ============================================================ */
.pn-product-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.pn-product {
  border: 2px solid var(--pn-border-hard);
  border-radius: var(--pn-radius);
  padding: 40px 36px;
  box-shadow: var(--pn-shadow-strong);
  background: var(--pn-bg-page);
  display: flex; flex-direction: column;
}
.pn-product--brand { background: var(--pn-brand-blue); color: var(--pn-text-inverse); border-color: var(--pn-border-hard); }
.pn-product--brand .pn-product__title { color: var(--pn-text-inverse); }
.pn-product--brand .pn-product__desc { color: rgba(255,255,255,0.85); }
.pn-product--brand .pn-product__check { color: var(--pn-brand-yellow); }
.pn-product--brand .pn-product__list li { color: rgba(255,255,255,0.95); }
.pn-product__tag {
  font-family: var(--pn-font-mono); font-size: 12px; font-weight: 700;
  color: var(--pn-brand-blue); letter-spacing: 0.16em; text-transform: uppercase;
  margin: 0 0 16px;
  display: inline-flex; align-items: center; gap: 10px;
}
.pn-product__tag::before { content: ''; display: inline-block; width: 24px; height: 2px; background: currentColor; }
.pn-product--brand .pn-product__tag { color: var(--pn-brand-yellow); }
.pn-product__title { font-size: 30px; font-weight: 900; line-height: 1.2; letter-spacing: -0.02em; margin: 0 0 14px; }
.pn-product__desc { font-size: 16px; color: var(--pn-text-secondary); line-height: 1.7; margin: 0 0 24px; }
.pn-product__list { list-style: none; padding: 0; margin: 0 0 32px; }
.pn-product__list li {
  font-size: 15px; color: var(--pn-text-primary); line-height: 1.6;
  padding: 10px 0; border-top: 1px solid var(--pn-border-default);
  display: flex; align-items: flex-start; gap: 10px;
}
.pn-product__list li:first-child { border-top: 0; }
.pn-product--brand .pn-product__list li { border-top-color: rgba(255,255,255,0.12); }
.pn-product__check {
  font-family: var(--pn-font-mono); font-size: 12px; font-weight: 800;
  color: var(--pn-brand-blue); flex-shrink: 0; padding-top: 1px; letter-spacing: 0.04em;
}
.pn-product__cta { margin-top: auto; }

/* ============================================================
   06 · VS PAIR (Generic vs Custom)
   ============================================================ */
.pn-vs { display: grid; grid-template-columns: 1fr 1fr; gap: 0; border: 2px solid var(--pn-border-hard); border-radius: var(--pn-radius); overflow: hidden; box-shadow: var(--pn-shadow-strong); }
.pn-vs__col { padding: 32px 28px; }
.pn-vs__col--muted { background: var(--pn-bg-soft); border-right: 2px solid var(--pn-border-hard); }
.pn-vs__col--brand { background: var(--pn-brand-blue); color: var(--pn-text-inverse); }
.pn-vs__tag {
  font-family: var(--pn-font-mono); font-size: 11px; font-weight: 700;
  letter-spacing: 0.16em; text-transform: uppercase; margin: 0 0 12px;
}
.pn-vs__col--muted .pn-vs__tag { color: var(--pn-text-tertiary); }
.pn-vs__col--brand .pn-vs__tag { color: rgba(255,255,255,0.72); }
.pn-vs__head { font-size: 22px; font-weight: 900; line-height: 1.25; margin: 0 0 20px; letter-spacing: -0.015em; }
.pn-vs__rows { display: grid; grid-template-columns: 80px 1fr; gap: 10px 16px; font-size: 14px; line-height: 1.5; }
.pn-vs__rows > div:nth-child(odd) {
  font-family: var(--pn-font-mono); font-size: 11px; font-weight: 700;
  letter-spacing: 0.1em; text-transform: uppercase; padding-top: 2px;
}
.pn-vs__col--muted .pn-vs__rows > div:nth-child(odd) { color: var(--pn-text-tertiary); }
.pn-vs__col--brand .pn-vs__rows > div:nth-child(odd) { color: rgba(255,255,255,0.6); }
.pn-vs__col--brand .pn-vs__rows > div:nth-child(even) { color: var(--pn-text-inverse); font-weight: 600; }

/* ============================================================
   07 · FEATURE GRID (Agent capabilities)
   ============================================================ */
.pn-feat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 32px; }
.pn-feat {
  border: 2px solid var(--pn-border-hard);
  border-radius: var(--pn-radius);
  padding: 24px 22px;
  background: var(--pn-bg-page);
  box-shadow: var(--pn-shadow-soft);
}
.pn-feat__num {
  font-family: var(--pn-font-mono); font-size: 11px; font-weight: 700;
  color: var(--pn-brand-blue); letter-spacing: 0.16em; margin: 0 0 10px;
}
.pn-feat__title { font-size: 17px; font-weight: 800; color: var(--pn-text-primary); margin: 0 0 6px; letter-spacing: -0.01em; }
.pn-feat__desc { font-size: 13.5px; color: var(--pn-text-secondary); line-height: 1.6; margin: 0; }

/* ============================================================
   08 · KOS COMPARISON TABLE
   ============================================================ */
.pn-table {
  width: 100%; border-collapse: collapse;
  border: 2px solid var(--pn-border-hard); border-radius: var(--pn-radius);
  background: var(--pn-bg-page); box-shadow: var(--pn-shadow-strong);
  overflow: hidden;
}
.pn-table thead th {
  background: var(--pn-bg-dark); color: var(--pn-text-inverse);
  font-family: var(--pn-font-mono); font-size: 11px; font-weight: 700;
  letter-spacing: 0.16em; text-transform: uppercase;
  padding: 14px 20px; text-align: left;
  border-right: 1px solid rgba(255,255,255,0.18);
}
.pn-table thead th:last-child { border-right: 0; }
.pn-table thead th.is-emph { background: var(--pn-brand-blue); }
.pn-table tbody td {
  padding: 18px 20px; vertical-align: top;
  border-top: 2px solid var(--pn-border-hard);
  border-right: 1px solid var(--pn-border-default);
  font-size: 14px; line-height: 1.65;
}
.pn-table tbody td:last-child { border-right: 0; }
.pn-table tbody td.dim {
  font-family: var(--pn-font-mono); font-size: 11px; font-weight: 700;
  color: var(--pn-text-tertiary); letter-spacing: 0.12em; text-transform: uppercase;
  background: var(--pn-bg-soft); width: 180px;
}
.pn-table tbody td.col-a { color: var(--pn-text-tertiary); }
.pn-table tbody td.col-b { background: var(--pn-brand-blue-50); }
.pn-table tbody td.col-b strong { display: block; font-weight: 800; color: var(--pn-text-primary); margin-bottom: 4px; }
.pn-table tbody td.col-b em { display: block; font-style: normal; font-size: 12px; color: var(--pn-brand-blue); font-weight: 700; }

/* ============================================================
   09 · CASE GRID
   ============================================================ */
.pn-case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.pn-case {
  border: 2px solid var(--pn-border-hard);
  border-radius: var(--pn-radius);
  padding: 28px 26px;
  background: var(--pn-bg-page);
  box-shadow: var(--pn-shadow-soft);
  display: flex; flex-direction: column;
  transition: transform .15s, box-shadow .15s;
}
.pn-case:hover { transform: translate(-2px, -2px); box-shadow: var(--pn-shadow-strong); }
.pn-case__kicker {
  font-family: var(--pn-font-mono); font-size: 10.5px; font-weight: 700;
  color: var(--pn-text-tertiary); letter-spacing: 0.14em; text-transform: uppercase;
  margin: 0 0 18px;
}
.pn-case__metric {
  font-family: var(--pn-font-mono); font-size: 56px; font-weight: 900;
  color: var(--pn-brand-blue); line-height: 1; letter-spacing: -0.04em;
  margin: 0 0 18px;
}
.pn-case__metric .unit { font-size: 28px; margin-left: 4px; }
.pn-case__metric--rose { color: var(--pn-brand-rose); }
.pn-case__metric--amber { color: var(--pn-brand-yellow); }
.pn-case__title { font-size: 18px; font-weight: 800; color: var(--pn-text-primary); margin: 0 0 10px; letter-spacing: -0.01em; }
.pn-case__desc { font-size: 14px; color: var(--pn-text-secondary); line-height: 1.65; margin: 0 0 18px; flex: 1; }
.pn-case__tags { display: flex; gap: 6px; flex-wrap: wrap; }
.pn-case__tag {
  font-family: var(--pn-font-mono); font-size: 10.5px; font-weight: 700;
  color: var(--pn-brand-blue); letter-spacing: 0.08em; text-transform: uppercase;
  padding: 4px 8px; border: 1px solid var(--pn-brand-blue); border-radius: 3px;
}

/* ============================================================
   10 · QUOTE / CALLOUT
   ============================================================ */
.pn-quote {
  border: 2px solid var(--pn-border-hard); border-radius: var(--pn-radius);
  padding: 36px 32px; margin: 48px 0; box-shadow: var(--pn-shadow-strong);
}
.pn-quote--brand { background: var(--pn-brand-blue); color: var(--pn-text-inverse); }
.pn-quote--brand .pn-quote__tag { color: rgba(255,255,255,0.75); }
.pn-quote--brand .pn-underline { border-bottom: 3px solid var(--pn-brand-yellow); padding-bottom: 1px; }
.pn-quote--white { background: var(--pn-bg-page); }
.pn-quote--white .pn-quote__tag { color: var(--pn-brand-blue); }
.pn-quote__tag {
  font-family: var(--pn-font-mono); font-size: 12px; font-weight: 700;
  letter-spacing: 0.16em; text-transform: uppercase; margin: 0 0 16px;
}
.pn-quote__main { font-size: 24px; font-weight: 800; line-height: 1.4; letter-spacing: -0.015em; margin: 0; }
.pn-quote__sub { font-size: 14px; color: var(--pn-text-secondary); margin-top: 10px; }
.pn-quote--brand .pn-quote__sub { color: rgba(255,255,255,0.72); }

/* ============================================================
   11 · CONTACT
   ============================================================ */
.pn-contact-wrap {
  display: grid; grid-template-columns: 1.6fr 1fr; gap: 0;
  border: 2px solid var(--pn-border-hard); border-radius: var(--pn-radius);
  background: var(--pn-bg-page); box-shadow: var(--pn-shadow-strong);
  overflow: hidden;
}
.pn-contact-left {
  background: var(--pn-brand-blue); color: var(--pn-text-inverse);
  padding: 56px 48px;
  border-right: 2px solid var(--pn-border-hard);
}
.pn-contact-left .pn-section__eyebrow { color: var(--pn-brand-yellow); }
.pn-contact-left .pn-section__eyebrow::before { background: var(--pn-brand-yellow); }
.pn-contact-left .pn-section__title { color: var(--pn-text-inverse); font-size: 36px; }
.pn-contact-left .pn-section__sub { color: rgba(255,255,255,0.85); margin-bottom: 32px; }
.pn-contact__items { display: flex; flex-direction: column; gap: 16px; margin: 0 0 32px; }
.pn-contact__item { display: flex; gap: 14px; align-items: flex-start; }
.pn-contact__item-label {
  font-family: var(--pn-font-mono); font-size: 10.5px; font-weight: 700;
  color: var(--pn-brand-yellow); letter-spacing: 0.14em; text-transform: uppercase;
  margin-bottom: 4px;
}
.pn-contact__item-value { font-size: 15px; font-weight: 600; color: var(--pn-text-inverse); }
.pn-contact__item-value a { color: inherit; border-bottom: 1px solid rgba(255,255,255,0.4); padding-bottom: 1px; }
.pn-contact-right {
  background: var(--pn-bg-page);
  padding: 48px 32px;
  display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center;
}
.pn-qr-tag {
  font-family: var(--pn-font-mono); font-size: 11px; font-weight: 700;
  color: var(--pn-brand-blue); letter-spacing: 0.16em; text-transform: uppercase;
  margin: 0 0 16px;
}
.pn-qr { width: 160px; height: 160px; border: 2px solid var(--pn-border-hard); border-radius: var(--pn-radius); }
.pn-qr-foot { font-size: 13px; color: var(--pn-text-secondary); margin-top: 12px; }

/* ============================================================
   12 · FOOTER
   ============================================================ */
.pn-footer {
  background: var(--pn-bg-dark); color: rgba(255,255,255,0.72);
  padding: 64px 0 40px;
  border-top: 2px solid var(--pn-border-hard);
}
.pn-footer__grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; padding-bottom: 32px; border-bottom: 1px solid rgba(255,255,255,0.12); }
.pn-footer__brand img { height: 28px; margin-bottom: 16px; filter: brightness(0) invert(1); }
.pn-footer__brand p { font-size: 13.5px; line-height: 1.7; max-width: 320px; margin: 0; }
.pn-footer h4 {
  font-family: var(--pn-font-mono); font-size: 11px; font-weight: 700;
  color: var(--pn-brand-yellow); letter-spacing: 0.16em; text-transform: uppercase;
  margin: 0 0 16px;
}
.pn-footer a { display: block; font-size: 13.5px; color: rgba(255,255,255,0.72); padding: 4px 0; transition: color .15s; }
.pn-footer a:hover { color: var(--pn-text-inverse); }
.pn-footer__bottom {
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap;
  gap: 16px; padding-top: 24px; font-size: 12px; color: rgba(255,255,255,0.5);
}
.pn-footer__bottom a { display: inline; color: rgba(255,255,255,0.5); }
.pn-footer__bottom .links { display: flex; gap: 20px; flex-wrap: wrap; }

/* ============================================================
   13 · INSIGHTS LIST PAGE
   ============================================================ */
.pn-list-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.pn-list-card {
  border: 2px solid var(--pn-border-hard); border-radius: var(--pn-radius);
  background: var(--pn-bg-page); box-shadow: var(--pn-shadow-soft);
  padding: 32px 28px; display: flex; flex-direction: column; gap: 12px;
  transition: transform .15s, box-shadow .15s;
}
.pn-list-card:hover { transform: translate(-3px, -3px); box-shadow: var(--pn-shadow-strong); }
.pn-list-card__chip {
  font-family: var(--pn-font-mono); font-size: 11px; font-weight: 700;
  color: var(--pn-brand-blue); letter-spacing: 0.14em; text-transform: uppercase;
}
.pn-list-card__title { font-size: 22px; font-weight: 900; line-height: 1.3; letter-spacing: -0.015em; color: var(--pn-text-primary); margin: 0; }
.pn-list-card__desc { font-size: 14px; line-height: 1.7; color: var(--pn-text-secondary); margin: 0; flex: 1; }
.pn-list-card__meta {
  display: flex; gap: 16px; padding-top: 14px; margin-top: 4px;
  border-top: 1px solid var(--pn-border-default);
  font-family: var(--pn-font-mono); font-size: 11px; font-weight: 700;
  color: var(--pn-text-tertiary); letter-spacing: 0.1em; text-transform: uppercase;
}
.pn-empty {
  border: 2px dashed var(--pn-border-default); border-radius: var(--pn-radius);
  padding: 56px 32px; text-align: center; color: var(--pn-text-tertiary);
  font-size: 14px;
}

/* ============================================================
   14 · UTILITIES
   ============================================================ */
.pn-mt-0 { margin-top: 0 !important; }
.pn-mt-32 { margin-top: 32px; }
.pn-mt-48 { margin-top: 48px; }
.pn-mt-64 { margin-top: 64px; }
.pn-text-mono { font-family: var(--pn-font-mono); }
.pn-text-blue { color: var(--pn-brand-blue); }
.pn-underline-yellow { border-bottom: 3px solid var(--pn-brand-yellow); padding-bottom: 1px; }

/* ============================================================
   15 · RESPONSIVE
   ============================================================ */
/* ============================================================
   TABLET (≤ 960px)
   ============================================================ */
@media (max-width: 960px) {
  .pn-hero__title { font-size: 48px; }
  .pn-section__title { font-size: 32px; }
  .pn-hero__metrics { grid-template-columns: repeat(2, 1fr); }
  .pn-metric:nth-child(2) { border-right: 0; }
  .pn-metric:nth-child(1), .pn-metric:nth-child(2) { border-bottom: 2px solid var(--pn-border-hard); }
  .pn-product-grid { grid-template-columns: 1fr; }
  .pn-thesis-card { grid-template-columns: 1fr; }
  .pn-thesis-card__right { border-left: 0; border-top: 2px solid var(--pn-border-hard); padding: 32px 24px; }
  .pn-thesis-card__num { font-size: 88px; }
  .pn-thesis-card__title { font-size: 28px; }
  .pn-thesis-card__left { padding: 32px 28px; }
  .pn-vs { grid-template-columns: 1fr; }
  .pn-vs__col--muted { border-right: 0; border-bottom: 2px solid var(--pn-border-hard); }
  .pn-feat-grid { grid-template-columns: 1fr 1fr; }
  .pn-case-grid { grid-template-columns: 1fr; }
  .pn-list-grid { grid-template-columns: 1fr; }
  .pn-contact-wrap { grid-template-columns: 1fr; }
  .pn-contact-left { border-right: 0; border-bottom: 2px solid var(--pn-border-hard); padding: 40px 32px; }
  .pn-contact-right { padding: 40px 32px; }
  .pn-footer__grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .pn-nav__links { display: none; }
  .pn-section { padding: 64px 0; }
  .pn-hero { padding: 64px 0 48px; }
}

/* ============================================================
   MOBILE (≤ 560px) — full optimization
   ============================================================ */
@media (max-width: 560px) {
  /* Container padding */
  .pn-container, .pn-hero__inner, .pn-nav__inner { padding: 0 16px; }

  /* Top nav: tighten everything, hide EN, shrink CTA */
  .pn-nav { height: 56px; }
  .pn-nav__inner { gap: 12px; }
  .pn-nav__logo { height: 22px; }
  .pn-nav__en { display: none; }
  .pn-nav__right { gap: 8px; }
  .pn-nav__right .pn-btn--small { padding: 6px 10px; font-size: 11px; box-shadow: 2px 2px 0 0 var(--pn-border-hard); }
  .pn-nav__right .pn-btn__arrow { display: none; }

  /* Hero */
  .pn-hero { padding: 40px 0 32px; }
  .pn-hero__eyebrow { margin: 0 0 14px; font-size: 10.5px; letter-spacing: 0.16em; }
  .pn-hero__title { font-size: 30px; line-height: 1.15; margin: 0 0 18px; letter-spacing: -0.025em; }
  .pn-hero__lead { font-size: 15px; line-height: 1.6; margin: 0 0 28px; }
  .pn-hero__ctas { gap: 10px; margin: 0 0 32px; }
  .pn-hero__ctas .pn-btn { padding: 10px 14px; font-size: 13px; flex: 1; min-width: 140px; box-shadow: 3px 3px 0 0 var(--pn-border-hard); }

  /* Hero metrics: stack to single column */
  .pn-hero__metrics { grid-template-columns: 1fr; max-width: 100%; }
  .pn-metric { border-right: 0; border-bottom: 2px solid var(--pn-border-hard); padding: 16px 20px; }
  .pn-metric:last-child { border-bottom: 0; }
  .pn-metric__num { font-size: 28px; }
  .pn-metric__num .unit { font-size: 16px; }
  .pn-metric__label { font-size: 10px; }

  /* Section general */
  .pn-section { padding: 48px 0; }
  .pn-section__head { margin: 0 0 28px; }
  .pn-section__eyebrow { font-size: 10.5px; margin: 0 0 12px; }
  .pn-section__title { font-size: 24px; line-height: 1.2; }
  .pn-section__sub { font-size: 14px; line-height: 1.65; }

  /* Thesis card (Featured Practice Notes) */
  .pn-thesis { padding: 40px 0; }
  .pn-thesis-card__left { padding: 24px 20px; }
  .pn-thesis-card__chip { font-size: 10.5px; margin: 0 0 16px; }
  .pn-thesis-card__title { font-size: 20px; line-height: 1.2; margin: 0 0 14px; }
  .pn-thesis-card__lead { font-size: 14px; line-height: 1.6; margin: 0 0 20px; }
  .pn-thesis-card__right { padding: 28px 20px; }
  .pn-thesis-card__num { font-size: 64px; }
  .pn-thesis-card__series { font-size: 11px; margin-top: 12px; }

  /* Products */
  .pn-product { padding: 28px 22px; }
  .pn-product__tag { font-size: 10.5px; margin: 0 0 12px; }
  .pn-product__title { font-size: 22px; line-height: 1.25; margin: 0 0 12px; }
  .pn-product__desc { font-size: 14px; line-height: 1.65; margin: 0 0 18px; }
  .pn-product__list li { font-size: 14px; padding: 8px 0; }

  /* VS pair */
  .pn-vs__col { padding: 24px 20px; }
  .pn-vs__tag { font-size: 10px; }
  .pn-vs__head { font-size: 18px; margin: 0 0 16px; }
  .pn-vs__rows { grid-template-columns: 64px 1fr; gap: 8px 12px; font-size: 13px; }
  .pn-vs__rows > div:nth-child(odd) { font-size: 10px; }

  /* Feature grid */
  .pn-feat-grid { grid-template-columns: 1fr; gap: 12px; margin-top: 24px; }
  .pn-feat { padding: 18px 18px; }
  .pn-feat__num { font-size: 10px; }
  .pn-feat__title { font-size: 15px; }
  .pn-feat__desc { font-size: 13px; }

  /* KOS table */
  .pn-table thead th { padding: 10px 12px; font-size: 10px; }
  .pn-table tbody td { padding: 12px; font-size: 13px; }
  .pn-table tbody td.dim { width: 88px; font-size: 10px; }

  /* Cases */
  .pn-case { padding: 22px 20px; }
  .pn-case__kicker { font-size: 9.5px; margin: 0 0 14px; }
  .pn-case__metric { font-size: 44px; margin: 0 0 14px; }
  .pn-case__metric .unit { font-size: 22px; }
  .pn-case__title { font-size: 16px; margin: 0 0 8px; }
  .pn-case__desc { font-size: 13px; line-height: 1.6; }
  .pn-case__tag { font-size: 9.5px; padding: 3px 6px; }

  /* Quote */
  .pn-quote { padding: 28px 22px; margin: 32px 0; }
  .pn-quote__main { font-size: 19px; line-height: 1.4; }
  .pn-quote__sub { font-size: 13px; }

  /* Contact */
  .pn-contact-left { padding: 32px 24px; }
  .pn-contact-left .pn-section__title { font-size: 24px; }
  .pn-contact-right { padding: 28px 24px; }
  .pn-qr { width: 140px; height: 140px; }
  .pn-contact__items { gap: 12px; margin: 0 0 24px; }
  .pn-contact__item-value { font-size: 14px; }

  /* Insights list */
  .pn-list-card { padding: 24px 22px; }
  .pn-list-card__chip { font-size: 10.5px; }
  .pn-list-card__title { font-size: 18px; line-height: 1.3; }
  .pn-list-card__desc { font-size: 13px; line-height: 1.6; }
  .pn-list-card__meta { flex-wrap: wrap; gap: 6px 12px; font-size: 10px; }

  /* Footer */
  .pn-footer { padding: 40px 0 28px; }
  .pn-footer__grid { grid-template-columns: 1fr; gap: 24px; padding-bottom: 24px; }
  .pn-footer__brand p { font-size: 13px; }
  .pn-footer h4 { font-size: 10px; margin: 0 0 12px; }
  .pn-footer a { font-size: 13px; padding: 3px 0; }
  .pn-footer__bottom { font-size: 11px; }

  /* General buttons */
  .pn-btn { padding: 10px 16px; font-size: 13px; box-shadow: 3px 3px 0 0 var(--pn-border-hard); }
  .pn-btn--small { padding: 6px 10px; font-size: 11px; }
}

/* ============================================================
   ULTRA-NARROW (≤ 380px) — iPhone SE / very tight devices
   ============================================================ */
@media (max-width: 380px) {
  .pn-hero__title { font-size: 26px; }
  .pn-section__title { font-size: 22px; }
  .pn-thesis-card__title { font-size: 18px; }
  .pn-thesis-card__num { font-size: 56px; }
  .pn-product__title { font-size: 20px; }
  .pn-case__metric { font-size: 38px; }
  .pn-hero__ctas .pn-btn { min-width: 120px; }
}