/* ==========================================================================
   Base: reset, typography, primitives, utilities
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 12px);
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-body);
  line-height: 1.7;
  font-feature-settings: "kern" 1, "liga" 1;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

body.is-locked { overflow: hidden; }

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.06;
  letter-spacing: var(--tracking-tight);
  margin: 0;
  text-wrap: balance;
}

h1 { font-size: var(--step-display); }
h2 { font-size: var(--step-h2); }
h3 { font-size: var(--step-h3); line-height: 1.25; }

p { margin: 0 0 1.1em; max-width: var(--measure); }
p:last-child { margin-bottom: 0; }

a { color: inherit; text-decoration: none; }

ul, ol { margin: 0; padding: 0; list-style: none; }

strong { font-weight: 600; }

::selection { background: var(--navy-800); color: var(--white); }

:focus-visible {
  outline: 2px solid var(--bronze);
  outline-offset: 3px;
}

/* --------------------------------------------------------------------------
   Layout primitives
   -------------------------------------------------------------------------- */

.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: var(--section-y); position: relative; }
.section--tight { padding-block: clamp(3.5rem, 2.5rem + 4vw, 6rem); }

.section--dark {
  background: var(--navy-800);
  color: rgba(255, 255, 255, 0.82);
}
.section--dark h2, .section--dark h3 { color: var(--white); }

.section--paper { background: var(--paper); }
.section--white { background: var(--white); }
.section--concrete { background: var(--concrete); }

.skip-link {
  position: absolute;
  left: 1rem;
  top: -120px;
  z-index: 200;
  background: var(--navy-800);
  color: var(--white);
  padding: 0.75rem 1.25rem;
  font-size: var(--step-small);
  transition: top var(--dur-fast) var(--ease-out);
}
.skip-link:focus { top: 1rem; }

/* --------------------------------------------------------------------------
   Section headings
   -------------------------------------------------------------------------- */

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--step-label);
  font-weight: 500;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--steel-700);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0 0 1.5rem;
  line-height: 1.4;
}
.eyebrow::before {
  content: "";
  width: 34px;
  height: 1px;
  background: var(--bronze);
  flex: none;
}
.section--dark .eyebrow { color: var(--bronze-light); }

.section-head { margin-bottom: clamp(2.5rem, 1.5rem + 3vw, 4.5rem); }
.section-head__title { max-width: 20ch; }
.section-head__lead {
  margin-top: 1.5rem;
  font-size: var(--step-lead);
  color: var(--ink-soft);
  max-width: 54ch;
  line-height: 1.65;
}
.section--dark .section-head__lead { color: rgba(255, 255, 255, 0.7); }

.section-head--split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.8fr);
  gap: clamp(1.5rem, 4vw, 5rem);
  align-items: end;
}
@media (max-width: 860px) {
  .section-head--split { grid-template-columns: minmax(0, 1fr); align-items: start; }
  .section-head__title { max-width: 100%; }
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */

.btn {
  --btn-bg: var(--navy-800);
  --btn-fg: var(--white);
  --btn-border: var(--navy-800);
  --btn-hover: var(--steel-700);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.85rem;
  padding: 1rem 1.6rem;
  background: var(--btn-bg);
  color: var(--btn-fg);
  border: 1px solid var(--btn-border);
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  line-height: 1;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  isolation: isolate;
  transition: color var(--dur) var(--ease-out), border-color var(--dur) var(--ease-out),
              background-color var(--dur) var(--ease-out);
}
.btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--btn-hover);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease-inout);
  z-index: -1;
}
.btn:hover::after, .btn:focus-visible::after { transform: scaleX(1); }
.btn:hover, .btn:focus-visible { border-color: var(--btn-hover); color: var(--white); }

.btn__arrow {
  width: 18px;
  height: 8px;
  flex: none;
  transition: transform var(--dur) var(--ease-out);
}
.btn:hover .btn__arrow, .btn:focus-visible .btn__arrow { transform: translateX(5px); }

.btn--ghost {
  --btn-bg: transparent;
  --btn-fg: var(--ink);
  --btn-border: var(--line);
  --btn-hover: var(--navy-800);
}

.btn--on-dark {
  --btn-bg: transparent;
  --btn-fg: rgba(255, 255, 255, 0.92);
  --btn-border: rgba(255, 255, 255, 0.4);
  --btn-hover: var(--white);
}
.btn--on-dark:hover, .btn--on-dark:focus-visible { color: var(--navy-800); border-color: var(--white); }

.btn--light {
  --btn-bg: var(--white);
  --btn-fg: var(--navy-800);
  --btn-border: var(--white);
  --btn-hover: var(--bronze);
}
.btn--light:hover, .btn--light:focus-visible { color: var(--navy-900); border-color: var(--bronze); }

.btn[disabled], .btn[aria-disabled="true"] { opacity: 0.6; cursor: not-allowed; }
.btn[disabled]::after { transform: scaleX(0); }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--navy-800);
  padding-bottom: 5px;
  border-bottom: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease-out), color var(--dur) var(--ease-out);
}
.link-arrow:hover { border-color: var(--bronze); color: var(--steel-700); }
@media (pointer: coarse) {
  .link-arrow { padding-block: 0.65rem 0.6rem; }
}
.link-arrow svg { transition: transform var(--dur) var(--ease-out); }
.link-arrow:hover svg { transform: translateX(4px); }
.section--dark .link-arrow { color: var(--white); border-color: rgba(255, 255, 255, 0.25); }
.section--dark .link-arrow:hover { border-color: var(--bronze-light); color: var(--bronze-light); }

/* --------------------------------------------------------------------------
   Blueprint decoration
   -------------------------------------------------------------------------- */

.grid-lines {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 96px 96px;
  -webkit-mask-image: radial-gradient(ellipse 78% 68% at 50% 42%, #000 25%, transparent 100%);
  mask-image: radial-gradient(ellipse 78% 68% at 50% 42%, #000 25%, transparent 100%);
}
.section--dark .grid-lines {
  background-image:
    linear-gradient(to right, var(--grid-line-dark) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line-dark) 1px, transparent 1px);
}

.rule {
  height: 1px;
  background: var(--line);
  border: 0;
  margin: 0;
}
.section--dark .rule { background: rgba(255, 255, 255, 0.14); }

/* --------------------------------------------------------------------------
   Media frames
   -------------------------------------------------------------------------- */

.frame {
  position: relative;
  overflow: hidden;
  background: var(--concrete);
}
.frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.frame--4x5 { aspect-ratio: 4 / 5; }
.frame--3x2 { aspect-ratio: 3 / 2; }
.frame--3x4 { aspect-ratio: 3 / 4; }
.frame--21x9 { aspect-ratio: 21 / 9; }

/* --------------------------------------------------------------------------
   Forms
   -------------------------------------------------------------------------- */

.field { position: relative; display: flex; flex-direction: column; gap: 0.5rem; }

.field__label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
}
.field__label .req { color: var(--bronze-text); }

.field input,
.field select,
.field textarea {
  width: 100%;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 0;
  padding: 0.9rem 1rem;
  transition: border-color var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);
  appearance: none;
  -webkit-appearance: none;
}
.field textarea { resize: vertical; min-height: 140px; line-height: 1.6; }

.field input::placeholder,
.field textarea::placeholder { color: #6b7683; opacity: 1; }

.field select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns=%22http://www.w3.org/2000/svg%22 width=%2212%22 height=%228%22 viewBox=%220 0 12 8%22%3E%3Cpath d=%22M1 1l5 5 5-5%22 fill=%22none%22 stroke=%22%235c6976%22 stroke-width=%221.4%22/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.75rem;
  cursor: pointer;
}

.field input:hover, .field select:hover, .field textarea:hover { border-color: var(--steel-300); }

.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--steel-700);
  box-shadow: 0 0 0 3px rgba(29, 78, 119, 0.14);
}

.field input[aria-invalid="true"],
.field select[aria-invalid="true"],
.field textarea[aria-invalid="true"] { border-color: var(--danger); }

.field__error {
  font-size: 0.8125rem;
  line-height: 1.4;
  color: var(--danger);
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}
.field__error:not(:empty) { opacity: 1; transform: none; }

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* --------------------------------------------------------------------------
   Scroll reveal
   -------------------------------------------------------------------------- */

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 900ms var(--ease-out), transform 900ms var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}
.reveal.is-visible { opacity: 1; transform: none; }

.reveal-mask { overflow: hidden; }
.reveal-mask > * {
  display: block;
  transform: translateY(103%);
  transition: transform 1000ms var(--ease-inout);
  transition-delay: var(--reveal-delay, 0ms);
}
.reveal-mask.is-visible > * { transform: none; }

.reveal-img img {
  clip-path: inset(0 0 100% 0);
  transform: scale(1.07);
  transition: clip-path 1200ms var(--ease-inout), transform 1500ms var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}
.reveal-img.is-visible img { clip-path: inset(0 0 0 0); transform: scale(1); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .reveal, .reveal-mask > * { opacity: 1; transform: none; }
  .reveal-img img { clip-path: none; transform: none; }
}