/**
 * button.css — Novagroup Button Component
 * Variants: .btn--primary (copper fill), .btn--ghost (navy outline), .btn--link
 * ALL values reference tokens from css/tokens.css.
 */

/* ============================================================
 * BASE BUTTON
 * ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  font-family: var(--font-sans);
  font-size: var(--fs-nav);
  font-weight: 600;
  line-height: 1;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  padding: 0.875rem 2rem;
  border-radius: var(--radius-pill);
  border: 2px solid transparent;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition:
    background-color var(--dur-short) var(--ease-out),
    color           var(--dur-short) var(--ease-out),
    border-color    var(--dur-short) var(--ease-out),
    transform       var(--dur-short) var(--ease-out),
    box-shadow      var(--dur-short) var(--ease-out);
  text-decoration: none;
  white-space: nowrap;
}

.btn:focus-visible {
  outline: var(--focus-ring-width) var(--focus-ring-style) var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.45;
  pointer-events: none;
  cursor: not-allowed;
}

/* ============================================================
 * PRIMARY — copper fill, navy text
 * ============================================================ */
.btn--primary {
  background-color: var(--c-copper);
  color: var(--c-navy);
  border-color: var(--c-copper);
}

.btn--primary:hover {
  background-color: var(--c-copper-bright);
  color: var(--c-navy);
  border-color: var(--c-copper-bright);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn--primary:active {
  background-color: var(--c-copper-deep);
  border-color: var(--c-copper-deep);
  transform: translateY(0);
  box-shadow: none;
}

/* Rotating copper ring on hover — desktop only */
.btn--primary::before {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--c-copper-bright);
  opacity: 0;
  transform: rotate(0deg);
  transition: opacity var(--dur-short) var(--ease-out);
}

.btn--primary:hover::before {
  opacity: 0.4;
  animation: btn-ring-rotate 2s var(--ease-linear) infinite;
}

@keyframes btn-ring-rotate {
  to { transform: rotate(360deg); }
}

/* Diagonal copper-light sheen — a single-pass light sweep on hover. CSS-only,
 * clipped by the button's overflow:hidden. (#30 sheen only) */
.btn--primary::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    105deg,
    transparent 30%,
    rgba(255, 255, 255, 0.35) 50%,
    transparent 70%
  );
  transform: translateX(-120%);
  pointer-events: none;
}

.btn--primary:hover::after {
  transform: translateX(120%);
  transition: transform var(--dur-long) var(--ease-out);
}

@media (prefers-reduced-motion: reduce) {
  .btn--primary:hover::before {
    animation: none;
  }

  /* No sweep under reduced motion — reset, no transition */
  .btn--primary::after,
  .btn--primary:hover::after {
    transform: translateX(-120%);
    transition: none;
  }
}

/* ============================================================
 * GHOST — navy outline, transparent fill
 * ============================================================ */
.btn--ghost {
  background-color: transparent;
  color: var(--c-navy);
  border-color: var(--c-navy);
}

.btn--ghost:hover {
  background-color: var(--c-navy);
  color: var(--c-bone);
  border-color: var(--c-navy);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.btn--ghost:focus-visible {
  outline: 2px solid var(--c-copper);
  outline-offset: 2px;
}

.btn--ghost:active {
  background-color: var(--c-navy-deep);
  color: var(--c-bone);
  transform: translateY(0);
}

/* Ghost on dark backgrounds (e.g. the hero secondary CTA): white text, faint
 * light border at rest, brightening to a copper outline + copper-bright text on
 * hover so it reads as on-brand over the dark hero rather than inverting to a
 * solid white fill. (#15 / id:single-cta-funnel) */
.on-dark .btn--ghost,
.btn--ghost-light {
  background-color: transparent;
  color: var(--c-white);
  border-color: rgba(247, 248, 250, 0.4);
}

.on-dark .btn--ghost:hover,
.btn--ghost-light:hover {
  background-color: rgba(184, 115, 51, 0.08);
  color: var(--c-copper-bright);
  border-color: var(--c-copper);
}


/* ============================================================
 * LINK — underline draw, no background
 * ============================================================ */
.btn--link {
  background-color: transparent;
  border-color: transparent;
  color: var(--c-copper);
  padding-inline: 0;
  border-radius: 0;
  position: relative;
  text-transform: none;
  letter-spacing: var(--tracking-normal);
  font-weight: 500;
}

.btn--link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--c-copper);
  transition: width var(--dur-short) var(--ease-out);
}

.btn--link:hover {
  color: var(--c-copper-bright);
  transform: none;
  box-shadow: none;
}

.btn--link:hover::after {
  width: 100%;
}

/* Arrow icon included inline */
.btn--link .btn__arrow {
  display: inline-block;
  margin-left: var(--sp-2);
  transition: transform var(--dur-short) var(--ease-out);
}

.btn--link:hover .btn__arrow {
  transform: translateX(4px);
}

/* ============================================================
 * SIZE VARIANTS
 * ============================================================ */
.btn--sm {
  font-size: var(--fs-small);
  padding: 0.6rem 1.25rem;
}

.btn--lg {
  font-size: var(--fs-body);
  padding: 1.125rem 2.5rem;
}