/* ── Base button ──────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-weight: 600;
  border: none;
  border-radius: 0;
  position: relative;
  overflow: hidden;
  transition: transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
  cursor: pointer;
  white-space: nowrap;
}

/* Gloss overlay */
.btn::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    105deg,
    transparent 30%,
    rgba(255, 255, 255, 0.25) 50%,
    transparent 70%
  );
  transition: left 0.4s cubic-bezier(0.22, 1, 0.36, 1);
  pointer-events: none;
}

.btn:hover::after {
  left: 100%;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0) scale(0.98);
}

.btn:active::after {
  left: 100%;
  transition: none;
}

/* ── Sizes ───────────────────────────────────── */

.btn-lg {
  font-size: var(--text-base);
  padding: 16px 36px;
}

.btn-md {
  font-size: var(--text-sm);
  padding: 12px 28px;
}

.btn-sm {
  font-size: var(--text-sm);
  padding: 8px 20px;
}

/* ── Variants ────────────────────────────────── */

.btn-primary {
  background: var(--decoded-orange);
  color: white;
}

.btn-primary:hover {
  background: var(--decoded-orange-hover);
  box-shadow: 0 4px 24px var(--decoded-orange-glow);
}

/* ── Ghost buttons ───────────────────────────── */

.btn-ghost {
  background: transparent;
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.4);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.6);
}

.btn-ghost::after {
  background: linear-gradient(
    105deg,
    transparent 30%,
    rgba(255, 255, 255, 0.08) 50%,
    transparent 70%
  );
}

/* Light surface ghost */
.btn-ghost-light {
  background: transparent;
  color: var(--light-text);
  border: 1px solid rgba(0, 0, 0, 0.15);
}

.btn-ghost-light:hover {
  background: rgba(0, 0, 0, 0.03);
  border-color: rgba(0, 0, 0, 0.25);
}

.btn-ghost-light::after {
  background: linear-gradient(
    105deg,
    transparent 30%,
    rgba(0, 0, 0, 0.04) 50%,
    transparent 70%
  );
}

/* Orange outline */
.btn-outline-orange {
  background: transparent;
  color: var(--decoded-orange);
  border: 1px solid var(--decoded-orange);
}

.btn-outline-orange:hover {
  background: var(--decoded-orange-light);
}

/* ── Icon button ─────────────────────────────── */

.btn-icon {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}