/* Shell: pinned spec-sheet head, numbered tab nav, footer */

/* ============ SITE HEAD — the document title block ============ */
.site-head {
  padding-top: calc(var(--nav-h) + var(--safe-top) + 26px);
  padding-bottom: 26px;
}

.head {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 12px 24px;
  align-items: end;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--ink);
}

.head h1 {
  grid-column: 1 / 3;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 4.4vw, 52px);
  line-height: 1.02;
  letter-spacing: -0.005em;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  color: var(--ink);
}

.head h1 em {
  font-style: italic;
}

/* The little red "WIREFRAME v0.9" pin chip */
.pin {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1;
  padding: 6px 10px;
  border: 1.5px dashed var(--accent);
  color: var(--accent);
  transform: rotate(-2.2deg);
  letter-spacing: 0.18em;
  background: var(--paper);
  white-space: nowrap;
}

.pin .x {
  width: 6px;
  height: 6px;
  background: var(--accent);
  transform: rotate(45deg);
  flex-shrink: 0;
}

.head .sub {
  font-family: var(--font-hand);
  font-size: clamp(16px, 1.8vw, 20px);
  line-height: 1.35;
  color: var(--pencil);
  margin: 0;
  max-width: 60ch;
  min-width: 0;
}

.head .meta {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
  color: var(--pencil);
  letter-spacing: 0.14em;
  text-align: right;
  text-transform: uppercase;
  white-space: nowrap;
}

.head .meta b {
  color: var(--ink);
  font-weight: 600;
}

/* ============ NAV — numbered sketch tabs ============ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: calc(var(--nav-h) + var(--safe-top));
  padding-top: var(--safe-top);
  transition:
    background var(--dur-fast) var(--ease-out),
    box-shadow var(--dur-fast) var(--ease-out);
}

.nav.is-scrolled {
  background: rgba(251, 246, 236, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 2px 0 var(--ink);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  height: var(--nav-h);
}

.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.nav-logo-text {
  font-family: var(--font-display);
  font-weight: 800;
  font-style: italic;
  font-size: 22px;
  line-height: 1;
  color: var(--ink);
  padding: 4px 6px 3px;
  border-bottom: 2px solid var(--ink);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: auto;
}

.nav-links a {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 12px;
  min-height: 40px;
  font-family: var(--font-hand);
  font-size: 16px;
  color: var(--pencil);
  text-decoration: none;
  transform: rotate(-0.4deg);
  transition: color var(--dur-fast) var(--ease-out);
}

.nav-links a .num {
  font-family: var(--font-mono);
  font-size: 10.5px;
  line-height: 1;
  color: var(--pencil);
  padding: 4px 6px;
  border: 1.5px solid var(--pencil);
  border-radius: 3px;
  letter-spacing: 0.06em;
}

.nav-links a:hover {
  color: var(--ink);
}

/* highlighter swipe behind the active tab (reference .tab.active::before) */
.nav-links a.is-active {
  color: var(--ink);
}

.nav-links a.is-active::before {
  content: "";
  position: absolute;
  left: -2px;
  right: -2px;
  top: 5px;
  bottom: 5px;
  background: var(--highlight);
  transform: skew(-8deg) rotate(0.4deg);
  z-index: -1;
  opacity: 0.85;
  border-radius: 2px;
}

.nav-links a.is-active .num {
  border-color: var(--ink);
  color: var(--ink);
}

.nav-tools {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Language toggle — sketchy pill pair */
.lang-toggle {
  display: inline-flex;
  border: 2px solid var(--pencil);
  border-radius: 999px;
  overflow: hidden;
  background: var(--paper);
  box-shadow: var(--shadow-btn-sm);
  transform: rotate(-0.8deg);
}

.lang-toggle button {
  appearance: none;
  background: transparent;
  border: 0;
  cursor: pointer;
  padding: 7px 12px;
  min-height: 32px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--pencil);
  transition:
    background var(--dur-fast) var(--ease-out),
    color var(--dur-fast) var(--ease-out);
}

.lang-toggle button + button {
  border-left: 2px solid var(--pencil);
}

.lang-toggle button:hover {
  color: var(--ink);
}

.lang-toggle button.is-active {
  background: var(--highlight);
  color: var(--ink);
}

/* Login link in nav */
.nav-login {
  font-family: var(--font-hand);
  font-size: 16px;
  color: var(--pencil);
  text-decoration: none;
  padding: 8px 10px;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  border: 1.5px dashed var(--pencil);
  border-radius: var(--radius-s);
  transform: rotate(0.5deg);
  transition:
    background var(--dur-fast) var(--ease-out),
    border-color var(--dur-fast) var(--ease-out),
    color var(--dur-fast) var(--ease-out);
}

.nav-login:hover {
  background: var(--paper-tint);
  border-style: solid;
  color: var(--ink);
}

/* Burger (mobile) */
.nav-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 11px;
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: var(--radius-s);
  cursor: pointer;
  box-shadow: var(--shadow-btn-sm);
}

.nav-burger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition:
    transform var(--dur-fast) var(--ease-out),
    opacity var(--dur-fast) var(--ease-out);
}

.nav-burger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(3.5px) rotate(45deg);
}

.nav-burger[aria-expanded="true"] span:nth-child(2) {
  transform: translateY(-3.5px) rotate(-45deg);
}

/* ============ FOOTER — thick ink rule, back on the desk ============ */
.footer {
  background: var(--paper);
  border-top: 3px solid var(--ink);
  padding: 36px 0 calc(40px + var(--safe-bottom));
  margin-top: var(--section-pad);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.footer-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-style: italic;
  font-size: 22px;
  line-height: 1;
  color: var(--ink);
  padding: 3px 6px 2px;
  border-bottom: 2px solid var(--ink);
}

.footer-tag {
  font-family: var(--font-hand);
  color: var(--pencil);
  font-size: 17px;
  margin-top: 6px;
}

.footer-note {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--pencil);
  text-transform: uppercase;
}

.footer-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-links a {
  font-family: var(--font-hand);
  font-size: 16px;
  color: var(--pencil);
  text-decoration: none;
  border-bottom: 1.5px dashed var(--rule);
  padding-bottom: 1px;
  transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}

.footer-links a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.footer-rights {
  font-family: var(--font-hand);
  color: var(--pencil);
  font-size: 15px;
  width: 100%;
  order: 10;
  margin-top: 8px;
  opacity: 0.8;
}

/* ============ MOBILE ============ */
@media (max-width: 1080px) {
  .nav-links a {
    font-size: 15px;
    padding: 8px 8px;
  }

  .nav-links a .num {
    display: none;
  }

  .head .meta {
    white-space: normal;
  }
}

@media (max-width: 960px) {
  .nav-burger {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: calc(var(--nav-h) + var(--safe-top));
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    margin: 0;
    padding: 14px 16px calc(16px + var(--safe-bottom));
    background: rgba(251, 246, 236, 0.98);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 3px 0 var(--ink);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition:
      transform var(--dur-fast) var(--ease-out),
      opacity var(--dur-fast) var(--ease-out),
      visibility 0s linear var(--dur-fast);
  }

  .nav.is-menu-open .nav-links {
    transform: none;
    opacity: 1;
    visibility: visible;
    transition:
      transform var(--dur-fast) var(--ease-out),
      opacity var(--dur-fast) var(--ease-out);
  }

  .nav-links a {
    font-size: 17px;
    padding: 12px 12px;
    min-height: 44px;
  }

  .head {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .head h1 {
    grid-column: 1;
  }

  .head .meta {
    text-align: left;
    white-space: normal;
  }
}

@media (max-width: 480px) {
  .nav-logo-text {
    display: none;
  }

  .btn-nav {
    display: none;
  }
}