/* =============================================================
   PlusBIT Systems — Components (reusable UI)
   ============================================================= */

/* ---- Icons (centralized registry injects the <svg>) ---- */
.icon { display: inline-flex; align-items: center; justify-content: center; flex: none; }
.icon__svg { width: 100%; height: 100%; display: block; }

/* ---- Eyebrow label (mono, the clinical "instrument" texture) ---- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: var(--fz-eyebrow);
  font-weight: 500;
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--primary-700);
}
.eyebrow::before {
  content: "+";
  font-weight: 600;
  font-size: 1em;
  color: var(--primary);
  transform: translateY(-0.04em);
}
.eyebrow--signal { color: var(--signal-700); }
.eyebrow--signal::before { color: var(--signal); }
.eyebrow--on-deep { color: var(--primary-bright); }
.eyebrow--on-deep::before { color: var(--primary-bright); }

/* ---- Buttons ---- */
.btn {
  --btn-bg: var(--ink);
  --btn-fg: #fff;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.85rem 1.4rem;
  background: var(--btn-bg);
  color: var(--btn-fg);
  border-radius: var(--r-sm);
  font-size: var(--fz-small);
  font-weight: 600;
  letter-spacing: -0.005em;
  border: 1px solid transparent;
  transition: transform var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease),
              background var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
  will-change: transform;
}
.btn .icon { width: 1.05em; height: 1.05em; }
.btn__arrow { transition: transform var(--dur) var(--ease); }
.btn:hover .btn__arrow { transform: translateX(3px); }

.btn--primary { --btn-bg: var(--primary); --btn-fg: #fff; }
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px -12px rgba(11, 125, 110, 0.6);
  background: var(--primary-700);
}
.btn--dark:hover {
  transform: translateY(-2px);
  background: var(--primary);
  box-shadow: 0 14px 30px -12px rgba(11, 125, 110, 0.55);
}
.btn--ghost {
  --btn-bg: transparent;
  --btn-fg: var(--ink);
  border-color: var(--line-strong);
}
.btn--ghost:hover { border-color: var(--ink); transform: translateY(-2px); }
.btn--light {
  --btn-bg: var(--on-deep);
  --btn-fg: var(--deep);
}
.btn--light:hover { transform: translateY(-2px); background: #fff; }
.btn--ghost-light {
  --btn-bg: transparent;
  --btn-fg: var(--on-deep);
  border-color: var(--deep-line);
}
.btn--ghost-light:hover { border-color: var(--primary-bright); color: #fff; transform: translateY(-2px); }
.btn--lg { padding: 1.05rem 1.8rem; font-size: var(--fz-body); }

/* ---- Text link with animated underline ---- */
.tlink {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--primary-700);
  font-weight: 600;
  font-size: var(--fz-small);
  background-image: linear-gradient(var(--primary), var(--primary));
  background-size: 0% 1.5px;
  background-repeat: no-repeat;
  background-position: 0 100%;
  transition: background-size var(--dur) var(--ease);
}
.tlink:hover { background-size: 100% 1.5px; }
.tlink .icon { width: 1em; height: 1em; transition: transform var(--dur) var(--ease); }
.tlink:hover .icon { transform: translateX(3px); }

/* ---- Tags / pills ---- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.02em;
  font-weight: 500;
  color: var(--primary-700);
  background: var(--primary-tint);
  border: 1px solid var(--primary-line);
  border-radius: var(--r-sm);
  padding: 0.28rem 0.6rem;
}

/* ---- Plus divider rule (signature device) ---- */
.rule {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin: 1.3rem 0;
}
.rule::before {
  content: "";
  width: 38px;
  height: 1.5px;
  background: var(--primary);
}
.rule::after {
  content: "+";
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--primary);
  line-height: 0;
  transform: translateY(0.02em);
}
.rule--center { justify-content: center; }

/* ---- Generic tile/card ---- */
.tile {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: clamp(1.4rem, 2.4vw, 2rem);
  transition: transform var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}
.tile:hover {
  transform: translateY(-4px);
  border-color: var(--primary-line);
  box-shadow: var(--shadow);
}
.tile__icon {
  width: 46px; height: 46px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 12px;
  color: var(--primary-700);
  background: var(--primary-tint);
  border: 1px solid var(--primary-line);
  margin-bottom: 1.15rem;
}
.tile__icon .icon { width: 22px; height: 22px; }
.tile__title { color: var(--ink); margin-bottom: 0.5rem; }
.tile__text { color: var(--muted); font-size: var(--fz-small); line-height: 1.62; }
.tile__tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 1.1rem; }

/* A clean top-accent that animates in on hover — replaces the
   generic "rounded card with a colored bar" cliché with restraint */
.tile--accent::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 2px;
  border-radius: var(--r) var(--r) 0 0;
  background: linear-gradient(90deg, var(--primary), var(--primary-300));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-2) var(--ease);
}
.tile--accent:hover::before { transform: scaleX(1); }

/* ---- Mono data readout row ---- */
.readout { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; }
.readout__label { font-size: var(--fz-small); color: var(--muted); }
.readout__value {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: var(--fz-small);
  color: var(--primary-700);
  letter-spacing: -0.01em;
}

/* =============================================================
   Site header / navigation
   ============================================================= */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: rgba(245, 243, 238, 0.82); /* fallback */
  background: color-mix(in srgb, var(--paper) 80%, transparent);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: color-mix(in srgb, var(--paper) 90%, transparent);
}
.nav { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; }

/* Brand mark — a precise "+" built from two bars inside a token */
.brand { display: inline-flex; align-items: center; gap: 0.7rem; }
.brand__mark { width: 38px; height: 38px; flex: none; }
.brand__name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.18rem;
  letter-spacing: -0.02em;
  color: var(--ink);
  line-height: 1;
}
.brand__name b { color: var(--primary-700); font-weight: 600; }
.brand__sub {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--faint);
  margin-top: 3px;
}

.nav__links { display: flex; align-items: center; gap: 1.6rem; }
.nav__link {
  font-size: var(--fz-small);
  font-weight: 500;
  color: var(--ink-soft);
  position: relative;
  padding-block: 0.3rem;
  transition: color var(--dur) var(--ease);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0; bottom: -1px;
  width: 100%; height: 1.5px;
  background: var(--primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}
.nav__link:hover { color: var(--ink); }
.nav__link:hover::after { transform: scaleX(1); }

.nav__right { display: flex; align-items: center; gap: 1rem; }

.nav__toggle {
  display: none;
  width: 44px; height: 44px;
  align-items: center; justify-content: center;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-sm);
  color: var(--ink);
}
.nav__toggle .icon { width: 22px; height: 22px; }
.nav__toggle .icon[data-icon="x-mark"] { display: none; }
.nav__toggle[aria-expanded="true"] .icon[data-icon="bars-3"] { display: none; }
.nav__toggle[aria-expanded="true"] .icon[data-icon="x-mark"] { display: inline-flex; }

/* Mobile menu sheet */
.mobile-menu {
  position: fixed;
  inset: var(--nav-h) 0 auto 0;
  z-index: 99;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  padding: 1.2rem var(--gutter) 1.6rem;
  display: grid;
  gap: 0.2rem;
  transform: translateY(-12px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur);
  box-shadow: var(--shadow);
}
.mobile-menu.is-open { opacity: 1; visibility: visible; transform: translateY(0); pointer-events: auto; }
.mobile-menu__link {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--ink);
  padding: 0.8rem 0.2rem;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.mobile-menu__link .icon { width: 16px; height: 16px; color: var(--faint); }
.mobile-menu__cta { margin-top: 1rem; justify-content: center; }

/* =============================================================
   Form fields (contact)
   ============================================================= */
.field { display: grid; gap: 0.4rem; }
.field__label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--on-deep-soft);
}
.field__input {
  width: 100%;
  padding: 0.8rem 0.95rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--deep-line);
  border-radius: var(--r-sm);
  color: var(--on-deep);
  font-size: var(--fz-small);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.field__input::placeholder { color: var(--on-deep-faint); }
.field__input:focus {
  outline: none;
  border-color: var(--primary-bright);
  background: rgba(255, 255, 255, 0.07);
}
textarea.field__input { resize: vertical; min-height: 120px; }