/* ============================================================
   NEXUS — Base / Reset / Typography / Header / Footer
   ============================================================ */

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

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

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 300;
  line-height: 1.7;
  color: var(--color-ink);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img,
svg,
video {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

ul,
ol {
  list-style: none;
}

input {
  font: inherit;
  color: inherit;
}

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

/* --- Accessibility helpers --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--sp-4);
  z-index: 100;
  padding: var(--sp-2) var(--sp-4);
  background: var(--color-ink);
  color: var(--color-bg);
  font-size: var(--text-sm);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--sp-2);
}

.noscript-message {
  padding: var(--sp-7);
  text-align: center;
  font-size: var(--text-md);
}

/* --- Page shell --- */
.page-shell {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--container-pad);
  padding-right: var(--container-pad);
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--color-ink);
}

h1 em, h2 em, h3 em {
  font-style: italic;
  font-weight: 300;
}

h1 { font-size: var(--text-2xl); }
h2 { font-size: var(--text-xl); }
h3 { font-size: var(--text-lg); }

p {
  margin-bottom: var(--sp-4);
}

p:last-child {
  margin-bottom: 0;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-ink-faint);
  margin-bottom: var(--sp-4);
}

/* --- Text link (inline with arrow) --- */
.text-link {
  display: inline-flex;
  align-items: baseline;
  gap: var(--sp-2);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--color-line-strong);
  padding-bottom: 2px;
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.text-link:hover {
  border-color: var(--color-accent);
}

/* --- Round link (large CTA) --- */
.round-link {
  display: inline-flex;
  flex-direction: column;
  gap: var(--sp-1);
  padding: var(--sp-5) var(--sp-7);
  border: 1px solid var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-md);
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.round-link span:first-child {
  font-weight: 400;
}

.round-link span:nth-child(2) {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  opacity: 0.6;
}

.round-link i {
  font-style: normal;
  margin-top: var(--sp-2);
}

.round-link:hover {
  background: var(--color-ink);
  color: var(--color-bg);
  border-color: var(--color-ink);
}

/* ============================================================
   HEADER / NAVIGATION
   ============================================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  padding: 0 var(--container-pad);
  background: rgba(232, 228, 218, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}

.site-header.is-scrolled {
  border-bottom-color: var(--color-line);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.brand-mark {
  display: inline-flex;
  gap: 2px;
  align-items: flex-end;
  height: 18px;
}

.brand-mark i {
  display: block;
  width: 3px;
  background: var(--color-ink);
}

.brand-mark i:nth-child(1) { height: 8px; }
.brand-mark i:nth-child(2) { height: 14px; }
.brand-mark i:nth-child(3) { height: 11px; }
.brand-mark i:nth-child(4) { height: 16px; }

.brand-word {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0.08em;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-faint);
  padding-left: var(--sp-3);
  border-left: 1px solid var(--color-line-strong);
}

.primary-navigation {
  display: flex;
  gap: var(--sp-7);
}

.primary-navigation a {
  font-size: var(--text-base);
  font-weight: 400;
  letter-spacing: 0.04em;
  padding: var(--sp-2) 0;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.primary-navigation a:hover,
.primary-navigation a[aria-current="page"] {
  border-bottom-color: var(--color-ink);
}

.header-index {
  display: flex;
  gap: var(--sp-5);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-faint);
}

.menu-toggle {
  display: none;
}

/* ============================================================
   FOOTER
   ============================================================ */

.site-footer {
  margin-top: var(--sp-10);
  padding: var(--sp-9) var(--container-pad) var(--sp-5);
  border-top: 1px solid var(--color-line);
}

.footer-lead {
  max-width: var(--container-max);
  margin: 0 auto var(--sp-8);
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
}

.footer-lead p {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  line-height: 1.2;
}

.footer-return {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  border-bottom: 1px solid var(--color-line-strong);
  padding-bottom: 2px;
}

.footer-grid {
  max-width: var(--container-max);
  margin: 0 auto var(--sp-7);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-5);
  padding-top: var(--sp-5);
  border-top: 1px solid var(--color-line);
}

.footer-label {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-faint);
  margin-bottom: var(--sp-2);
}

.footer-grid p {
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--color-ink-soft);
}

.footer-grid a:hover {
  text-decoration: underline;
}

.footer-base {
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-faint);
  padding-top: var(--sp-4);
  border-top: 1px solid var(--color-line);
}

/* ============================================================
   MAIN CONTENT OFFSET (fixed header)
   ============================================================ */

#main-content {
  padding-top: var(--header-h);
  outline: none;
}

/* ============================================================
   RESPONSIVE — Tablet
   ============================================================ */
@media (max-width: 1024px) {
  :root {
    --container-pad: 24px;
  }

  .brand-sub {
    display: none;
  }

  .header-index {
    display: none;
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============================================================
   RESPONSIVE — Mobile
   ============================================================ */
@media (max-width: 768px) {
  :root {
    --container-pad: 18px;
    --header-h: 56px;
  }

  .primary-navigation {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-line);
    padding: var(--sp-4) 0;
    transform: translateY(-120%);
    transition: transform var(--transition);
    z-index: 40;
  }

  .site-header.menu-is-open .primary-navigation {
    transform: translateY(0);
  }

  .primary-navigation a {
    padding: var(--sp-4) var(--container-pad);
    font-size: var(--text-lg);
    border-bottom: none;
    border-left: 2px solid transparent;
  }

  .primary-navigation a[aria-current="page"] {
    border-left-color: var(--color-accent);
  }

  .menu-toggle {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    letter-spacing: 0.1em;
  }

  .menu-toggle-lines {
    position: relative;
    width: 20px;
    height: 10px;
  }

  .menu-toggle-lines i {
    position: absolute;
    left: 0;
    width: 100%;
    height: 1px;
    background: var(--color-ink);
    transition: transform var(--transition-fast), top var(--transition-fast);
  }

  .menu-toggle-lines i:first-child { top: 2px; }
  .menu-toggle-lines i:last-child { top: 8px; }

  .site-header.menu-is-open .menu-toggle-lines i:first-child {
    top: 5px;
    transform: rotate(45deg);
  }

  .site-header.menu-is-open .menu-toggle-lines i:last-child {
    top: 5px;
    transform: rotate(-45deg);
  }

  body.menu-open {
    overflow: hidden;
  }

  .footer-lead {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--sp-4);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-4);
  }

  .footer-base {
    flex-direction: column;
    gap: var(--sp-2);
  }
}

/* --- Reduced motion --- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html {
    scroll-behavior: auto;
  }
}

/* --- Brand plaque (official SVG mark, unmodified) --- */
.brand-plaque {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  background: var(--color-ink);
  flex: none;
}
.brand-plaque img { width: 16px; height: auto; display: block; }
.brand-plaque--small {
  width: 22px;
  height: 22px;
  background: none;
}
.brand-plaque--small img { width: 15px; }

.nav-enter {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-left: var(--sp-4);
  border-left: 1px solid var(--color-line);
  color: var(--color-accent) !important;
}
.nav-enter span { transition: transform var(--transition-fast); }
.nav-enter:hover span { transform: translateX(3px); }