/* ============================================================
   BUTTONS COMPONENT
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-6);
  font-family: var(--f-primary);
  font-size: var(--sz-sm);
  font-weight: var(--fw-semibold);
  line-height: 1;
  border-radius: var(--r-full);
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--dur-normal) var(--ease-out);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  letter-spacing: 0.02em;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.15);
  transform: translateX(-100%);
  transition: transform var(--dur-normal) var(--ease-out);
}

.btn:hover::before { transform: translateX(0); }

/* Primary */
.btn-primary {
  background: var(--g-brand);
  color: var(--c-text-inv);
  border-color: transparent;
  box-shadow: var(--sh-brand);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(21,101,192,0.4);
  color: var(--c-text-inv);
}
.btn-primary:active { transform: translateY(0); }

/* Accent / CTA */
.btn-accent {
  background: var(--c-accent);
  color: var(--c-primary);
  border-color: transparent;
  box-shadow: var(--sh-accent);
  font-weight: var(--fw-bold);
}
.btn-accent:hover {
  background: #00DCFF;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0,201,224,0.45);
  color: var(--c-primary);
}

/* Outline (for dark backgrounds) */
.btn-outline {
  background: transparent;
  color: var(--c-text-inv);
  border-color: rgba(255,255,255,0.5);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.9);
  color: var(--c-text-inv);
  transform: translateY(-2px);
}

/* Outline dark (for light backgrounds) */
.btn-outline-dark {
  background: transparent;
  color: var(--c-primary);
  border-color: var(--c-border-mid);
}
.btn-outline-dark:hover {
  background: var(--c-primary);
  border-color: var(--c-primary);
  color: var(--c-text-inv);
  transform: translateY(-2px);
}

/* Ghost */
.btn-ghost {
  background: transparent;
  color: var(--c-secondary);
  border-color: transparent;
  padding-left: var(--sp-2);
  padding-right: var(--sp-2);
}
.btn-ghost:hover {
  color: var(--c-accent);
  background: var(--c-surface-3);
}
.btn-ghost::before { display: none; }

/* Glass (for hero sections) */
.btn-glass {
  background: rgba(255,255,255,0.12);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: white;
  border-color: rgba(255,255,255,0.25);
}
.btn-glass:hover {
  background: rgba(255,255,255,0.22);
  border-color: rgba(255,255,255,0.5);
  color: white;
  transform: translateY(-2px);
}

/* Sizes */
.btn-sm { padding: var(--sp-2) var(--sp-4); font-size: var(--sz-xs); }
.btn-lg { padding: var(--sp-4) var(--sp-8); font-size: var(--sz-base); }
.btn-xl { padding: var(--sp-5) var(--sp-10); font-size: var(--sz-lg); }

/* Icon only */
.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--r-full);
}
.btn-icon.btn-sm { width: 32px; height: 32px; }
.btn-icon.btn-lg { width: 48px; height: 48px; }

/* Full width */
.btn-block { width: 100%; }

/* Loading state */
.btn.loading {
  pointer-events: none;
  opacity: 0.7;
}
.btn.loading::after {
  content: '';
  width: 14px;
  height: 14px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

/* Link button */
.btn-link {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--sz-sm);
  font-weight: var(--fw-semibold);
  color: var(--c-secondary);
  position: relative;
  padding: 0;
}
.btn-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-normal) var(--ease-out);
}
.btn-link:hover { color: var(--c-accent); }
.btn-link:hover::after { transform: scaleX(1); }
.btn-link i { transition: transform var(--dur-fast) var(--ease-out); }
.btn-link:hover i { transform: translateX(3px); }

@keyframes spin { to { transform: rotate(360deg); } }