/* ==========================================================================
   Fine Kilter — site layout layer (v1 build, 16 July 2026)
   References semantic tokens only. Load after fonts.css, tokens.css,
   components.css. Layout/decisions record: ../../design-build-spec.md
   ========================================================================== */

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--surface-ground);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: var(--type-body);
  line-height: var(--line-body);
  -webkit-font-smoothing: antialiased;
}

/* --- Skip link ------------------------------------------------------------ */
.skip {
  position: absolute;
  left: -9999px;
  top: var(--s-2);
  background: var(--surface-mount);
  color: var(--text-primary);
  padding: var(--s-2) var(--s-4);
  border: 1px solid var(--border-mount);
  z-index: 10;
}
.skip:focus { left: var(--s-2); outline: 2px solid var(--focus); outline-offset: 2px; }

/* --- Shell ----------------------------------------------------------------- */
.wrap { max-width: 880px; margin-inline: auto; padding-inline: var(--s-5); }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-4);
  flex-wrap: wrap;
  padding-block: var(--s-5);
}
.brand { display: inline-flex; color: var(--text-primary); }
.brand svg { height: 36px; width: auto; display: block; }

.site-nav { display: flex; align-items: center; gap: var(--s-4); flex-wrap: wrap; }
.site-nav a:not(.btn) {
  color: var(--text-primary);
  text-decoration: none;
  font-size: var(--type-1);
  padding: var(--s-1) 0;
}
.site-nav a:not(.btn):hover { text-decoration: underline; text-underline-offset: 3px; }
.site-nav a[aria-current="page"] {
  text-decoration: underline;
  text-underline-offset: 6px;
  text-decoration-thickness: 2px;
}
.site-nav a:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }

/* --- Type ------------------------------------------------------------------ */
h1 { font-size: var(--type-6); font-weight: 500; line-height: 1.15; letter-spacing: -0.01em; margin: 0 0 var(--s-4); }
h2 { font-size: var(--type-4); font-weight: 500; line-height: 1.25; margin: var(--s-8) 0 var(--s-4); }
h3 { font-size: var(--type-3); font-weight: 500; margin: var(--s-5) 0 var(--s-2); }
p, ul, ol { margin: 0 0 var(--s-4); }
main p, main li { max-width: var(--measure); }
.lede { font-size: var(--type-3); color: var(--text-secondary); }
main a { color: inherit; text-underline-offset: 3px; }
main a:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
strong { font-weight: 500; }

.figure-label {
  font-family: var(--font-mono);
  font-size: var(--type-0);
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text-figure-label);
  margin: 0 0 var(--s-3);
}

/* --- Sections and panels ---------------------------------------------------- */
.section { padding-block: var(--s-7); }
.hero { padding-block: var(--s-8) var(--s-7); }
.hero .actions { margin-top: var(--s-6); }

.panel {
  background: var(--surface-mount);
  border: 1px solid var(--border-mount);
  border-radius: var(--radius-0);
  padding: var(--s-6);
}

.plain-list { padding-left: 1.2em; }
.plain-list li { margin-bottom: var(--s-2); }

.diff-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s-4); }
.diff-grid .panel h3 { margin-top: 0; }

/* --- Exhibit ---------------------------------------------------------------- */
.exhibit { border: 1px solid var(--border-mount); background: var(--surface-mount); padding: var(--s-5); }
.exhibit-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-5); }
.exhibit-cell { border: 1px solid var(--border-mount); padding: var(--s-4); background: var(--surface-ground); }
.exhibit-cell p { font-size: var(--type-1); margin-bottom: var(--s-3); }
.exhibit-caption { font-size: var(--type-1); color: var(--text-caption); margin: var(--s-4) 0 0; }

/* --- Steps ------------------------------------------------------------------ */
.steps { counter-reset: step; padding: 0; margin: 0 0 var(--s-4); list-style: none; }
.steps li { counter-increment: step; display: flex; gap: var(--s-4); margin-bottom: var(--s-4); max-width: var(--measure); }
.steps li::before {
  content: counter(step);
  font-family: var(--font-mono);
  font-size: var(--type-1);
  border: 1px solid var(--border-mount);
  width: 28px; height: 28px;
  display: inline-flex; align-items: center; justify-content: center;
  flex: none;
}

/* --- Actions ----------------------------------------------------------------- */
.actions { display: flex; gap: var(--s-4); align-items: center; flex-wrap: wrap; }
.action-block { margin-block: var(--s-7); }
a.btn { text-decoration: none; }

/* --- Form ---------------------------------------------------------------------- */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-4); }
.form-grid .field-wide { grid-column: 1 / -1; }
.field { margin-bottom: var(--s-2); }
textarea.inp { min-height: 120px; resize: vertical; font-family: var(--font-sans); line-height: 1.5; }
.form-note { font-size: var(--type-1); color: var(--text-secondary); margin-top: var(--s-4); }
.form-status[data-kind="error"] { color: var(--state-attention); }
.form-confirmation { color: var(--state-ok); }
.hp-field { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* --- FAQ (Straight answers) ------------------------------------------------------ */
.qa h2 { font-size: var(--type-3); margin: var(--s-6) 0 var(--s-2); }

/* --- Footer ------------------------------------------------------------------ */
.site-footer {
  margin-top: var(--s-8);
  border-top: 1px solid var(--border-mount);
  padding-block: var(--s-6);
  font-size: var(--type-1);
  color: var(--text-secondary);
}
.site-footer nav { display: flex; gap: var(--s-4); flex-wrap: wrap; margin-top: var(--s-2); }
.site-footer a { color: var(--text-secondary); text-underline-offset: 3px; }
.site-footer a:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }

/* --- Responsive ----------------------------------------------------------------- */
@media (max-width: 720px) {
  h1 { font-size: var(--type-5); }
  h2 { font-size: var(--type-3); }
  .exhibit-grid, .diff-grid, .form-grid { grid-template-columns: 1fr; }
  .section { padding-block: var(--s-6); }
  .hero { padding-block: var(--s-7) var(--s-6); }
  .panel { padding: var(--s-5); }
}