/* ============================================================================
   Nitamur Ad Caelum Ltd — site.css
   Custom properties, brand type rules, chevron dividers, keyframes, motion.
   Tailwind (CDN) handles layout/colour utilities; this file carries everything
   Tailwind config cannot express and every piece of motion.
   ========================================================================== */

:root {
  --nac-forest:      #25453A;
  --nac-forest-deep: #152A22;
  --nac-sage:        #8FB79A;
  --nac-sage-bright: #A9CDB6;
  --nac-tint:        #F4F6F3;
  --nac-offwhite:    #EEF3EE;
  --nac-tagline:     #7FA98B;

  /* Chevron geometry — 28 across, 22 down, exactly as the logo mark.
     --ch is the apex height; --cw is the matching horizontal run
     (--ch * 28 / 22) so the divider slope equals the logo slope. */
  --ch: 46px;
  --cw: 58.5px;
}

/* ---------------------------------------------------------------------------
   Base
   ------------------------------------------------------------------------- */
* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: 'Sora', system-ui, sans-serif;
  font-weight: 400;
  line-height: 1.65;
  color: var(--nac-forest);
  background: var(--nac-forest-deep);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Reserve the metrics of Sora so swapping the webfont in causes no shift. */
h1, h2, h3, h4 { line-height: 1.12; margin: 0; }
p { margin: 0; }

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

a { color: inherit; }

/* ---------------------------------------------------------------------------
   Brand type rules (non-negotiable)
   ------------------------------------------------------------------------- */
.brand-nac      { font-weight: 800; letter-spacing: -0.02em; }
.brand-limited  { font-weight: 400; opacity: 0.5; }

.eyebrow {
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-size: 0.72rem;
}

/* ---------------------------------------------------------------------------
   Focus — visible sage ring on every interactive element
   ------------------------------------------------------------------------- */
:focus-visible {
  outline: 3px solid var(--nac-sage-bright);
  outline-offset: 2px;
  border-radius: 2px;
}
/* Keep the default ring off when focus is driven by mouse, on browsers that
   support :focus-visible; the fallback below covers the rest. */
:focus:not(:focus-visible) { outline: none; }

.skip-link {
  position: fixed;
  top: -100px;
  left: 1rem;
  z-index: 100;
  background: var(--nac-sage-bright);
  color: var(--nac-forest-deep);
  font-weight: 600;
  padding: 0.75rem 1.25rem;
  border-radius: 6px;
  transition: top 0.18s ease;
}
.skip-link:focus { top: 1rem; }

/* ---------------------------------------------------------------------------
   Chevron section dividers
   The section gets an upward chevron cut into its top edge; a negative top
   margin overlaps the previous section so its colour shows through the cut.
   Slope run/rise = --cw / --ch = 28 / 22 — identical to the logo mark.
   ------------------------------------------------------------------------- */
.chevron-top {
  margin-top: calc(var(--ch) * -1);
  padding-top: calc(var(--ch) + 4rem);
  clip-path: polygon(
    0 var(--ch),
    calc(50% - var(--cw)) var(--ch),
    50% 0,
    calc(50% + var(--cw)) var(--ch),
    100% var(--ch),
    100% 100%,
    0 100%
  );
}

/* A thin sage seam that traces the same apex, drawn just above the cut. */
.chevron-seam {
  position: relative;
  height: var(--ch);
  margin-bottom: calc(var(--ch) * -1);
  z-index: 2;
  pointer-events: none;
}
.chevron-seam::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--nac-sage);
  opacity: 0.5;
  clip-path: polygon(
    0 var(--ch),
    calc(50% - var(--cw)) var(--ch),
    50% 0,
    calc(50% + var(--cw)) var(--ch),
    100% var(--ch),
    100% calc(var(--ch) + 2px),
    calc(50% + var(--cw)) calc(var(--ch) + 2px),
    50% 2px,
    calc(50% - var(--cw)) calc(var(--ch) + 2px),
    0 calc(var(--ch) + 2px)
  );
}

/* ---------------------------------------------------------------------------
   Progress rail — fixed right edge, one chevron tick per sector
   ------------------------------------------------------------------------- */
.rail {
  position: fixed;
  top: 50%;
  right: clamp(0.5rem, 1.5vw, 1.5rem);
  transform: translateY(-50%);
  z-index: 40;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  align-items: center;
}
.rail::before {
  content: "";
  position: absolute;
  top: -0.6rem;
  bottom: -0.6rem;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
  background: linear-gradient(
    to bottom,
    var(--nac-sage) 0 var(--rail-fill, 0%),
    rgba(143, 183, 154, 0.22) var(--rail-fill, 0%) 100%
  );
  transition: none;
}
.rail-tick {
  position: relative;
  z-index: 1;
  width: 26px;
  height: 26px;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  display: grid;
  place-items: center;
  color: var(--nac-sage);
  opacity: 0.55;
  transition: opacity 0.25s ease, transform 0.25s ease;
}
.rail-tick svg { width: 15px; height: 15px; display: block; transition: width 0.25s ease, height 0.25s ease; }
.rail-tick:hover { opacity: 0.85; }
.rail-tick[aria-current="true"] { opacity: 1; transform: scale(1.15); }
.rail-tick[aria-current="true"] svg { width: 22px; height: 22px; }
.rail-tick .rail-label {
  position: absolute;
  right: 130%;
  top: 50%;
  transform: translateY(-50%) translateX(6px);
  white-space: nowrap;
  font-size: 0.62rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--nac-offwhite);
  background: rgba(21, 42, 34, 0.92);
  padding: 0.25rem 0.55rem;
  border-radius: 4px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}
.rail-tick:hover .rail-label,
.rail-tick:focus-visible .rail-label { opacity: 1; transform: translateY(-50%) translateX(0); }

@media (max-width: 640px) { .rail { display: none; } }

/* ---------------------------------------------------------------------------
   Header
   ------------------------------------------------------------------------- */
.site-header {
  transition: background-color 0.3s ease, backdrop-filter 0.3s ease, box-shadow 0.3s ease;
}
.site-header.scrolled {
  background: rgba(21, 42, 34, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(143, 183, 154, 0.16);
}

/* Mobile nav overlay */
.mobile-nav {
  position: fixed;
  inset: 0;
  z-index: 60;
  background: var(--nac-forest-deep);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.35rem;
  padding: 2rem;
  transform: translateY(-100%);
  visibility: hidden;
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), visibility 0s linear 0.35s;
}
.mobile-nav.open {
  transform: translateY(0);
  visibility: visible;
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}
.mobile-nav a {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  color: var(--nac-offwhite);
  font-size: 1.5rem;
  font-weight: 600;
  padding: 0.6rem 0;
  text-decoration: none;
}
.mobile-nav a .tick { color: var(--nac-sage); flex: 0 0 auto; display: inline-flex; }
.mobile-nav a .tick svg { width: 28px; height: 10px; display: block; }

/* ---------------------------------------------------------------------------
   Placeholder styling — must be impossible to mistake for finished content
   ------------------------------------------------------------------------- */
.placeholder {
  display: inline-block;
  border: 1px dashed currentColor;
  border-radius: 6px;
  padding: 0.15em 0.6em;
  opacity: 0.6;
  font-style: italic;
  font-weight: 400;
  letter-spacing: 0.01em;
}
.placeholder-block {
  border: 1px dashed rgba(37, 69, 58, 0.45);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  color: rgba(37, 69, 58, 0.7);
  background: repeating-linear-gradient(
    45deg,
    transparent 0 10px,
    rgba(37, 69, 58, 0.04) 10px 20px
  );
  font-style: italic;
}

/* ---------------------------------------------------------------------------
   Status badges
   ------------------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  white-space: nowrap;
}
.badge::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
.badge-operating { color: #1f6b4a; background: rgba(143, 183, 154, 0.24); }
.badge-dev       { color: #8a6d1a; background: rgba(214, 178, 92, 0.22); }

/* Capability chips */
.chip {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 400;
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  border: 1px solid rgba(37, 69, 58, 0.18);
  color: var(--nac-forest);
  background: #fff;
}

/* ---------------------------------------------------------------------------
   Hero chevron draw-in
   Three chevrons rise into place bottom-to-top; sage arrives last at the apex.
   One orchestrated moment (~1.2s), settles, never repeats.
   ------------------------------------------------------------------------- */
@keyframes chevron-rise {
  from { opacity: 0; transform: translateY(26px); }
  to   { opacity: var(--to-opacity, 1); transform: translateY(0); }
}

.hero-mark path { opacity: 0; }
.hero-animate .hero-mark .cv-bottom {
  animation: chevron-rise 0.55s cubic-bezier(0.22, 1, 0.36, 1) 0.15s forwards;
}
.hero-animate .hero-mark .cv-mid {
  animation: chevron-rise 0.55s cubic-bezier(0.22, 1, 0.36, 1) 0.5s forwards;
}
.hero-animate .hero-mark .cv-top {
  animation: chevron-rise 0.6s cubic-bezier(0.22, 1, 0.36, 1) 0.9s forwards;
}

/* Static (no-JS / reduced motion) — mark shows in final state immediately. */
.hero-mark .cv-bottom { --to-opacity: 0.35; }
.hero-mark .cv-mid    { --to-opacity: 0.9; }
.hero-mark .cv-top    { --to-opacity: 1; }
.no-anim .hero-mark .cv-bottom { opacity: 0.35; }
.no-anim .hero-mark .cv-mid    { opacity: 0.9; }
.no-anim .hero-mark .cv-top    { opacity: 1; }

/* Scroll cue */
@keyframes cue-bob { 0%,100% { transform: translateY(0); opacity: 0.6; } 50% { transform: translateY(6px); opacity: 1; } }
.scroll-cue svg { animation: cue-bob 1.8s ease-in-out infinite; }

/* ---------------------------------------------------------------------------
   Scroll reveals
   ------------------------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ---------------------------------------------------------------------------
   Subsidiary card
   ------------------------------------------------------------------------- */
.subsidiary-logo-fallback {
  font-weight: 800;
  letter-spacing: -0.02em;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  color: var(--nac-forest);
  line-height: 1.05;
}
.card-tick-count { display: inline-flex; gap: 3px; align-items: flex-end; }
.card-tick-count svg { width: 13px; height: 13px; color: var(--nac-sage); }

/* Form */
.field-error { color: #a12b2b; font-size: 0.8rem; font-weight: 600; margin-top: 0.35rem; display: none; }
.field-error.show { display: block; }
.field-error::before { content: "⚠ "; }
input:where([aria-invalid="true"]), select:where([aria-invalid="true"]), textarea:where([aria-invalid="true"]) {
  border-color: #a12b2b !important;
  box-shadow: 0 0 0 1px #a12b2b;
}

.spinner {
  width: 18px; height: 18px;
  border: 2px solid rgba(238, 243, 238, 0.35);
  border-top-color: var(--nac-offwhite);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------------------------------------------------------------------------
   Reduced motion — kill the hero sequence, count-ups and every reveal.
   Content renders in its final state immediately.
   ------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .hero-mark .cv-bottom { opacity: 0.35 !important; transform: none !important; }
  .hero-mark .cv-mid    { opacity: 0.9 !important; transform: none !important; }
  .hero-mark .cv-top    { opacity: 1 !important; transform: none !important; }
  .reveal { opacity: 1 !important; transform: none !important; }
  .scroll-cue svg { animation: none !important; }
}