/* ============================================================
   ÁTOMO — Buttons — Glass System
   Depende de: tokens.css
   ============================================================ */

.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  line-height: var(--leading-tight);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
}

/* Botones con tooltip necesitan overflow visible para que el ::after escape */
.btn[data-tooltip] {
  overflow: visible;
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    box-shadow var(--transition-fast),
    transform var(--transition-fast);
  min-height: 44px;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

/* Grain overlay — se aplica vía ::after en todas las variantes glass */
.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23noise)' opacity='1'/%3E%3C/svg%3E");
  opacity: 0.035;
  pointer-events: none;
  mix-blend-mode: overlay;
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.45;
  pointer-events: none;
}

/* ── btn-brand — glass primary (CTA principal) ── */
.btn-brand {
  background-color: var(--glass-primary-bg);
  color: var(--color-primary);
  border-color: var(--glass-primary-border);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.40);
}
.btn-brand:hover {
  background-color: rgba(62, 95, 230, 0.18);
  border-color: rgba(62, 95, 230, 0.45);
  color: var(--color-primary);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.40),
              0 0 0 3px rgba(62, 95, 230, 0.12);
  transform: translateY(-1px);
}
.btn-brand:active {
  background-color: rgba(62, 95, 230, 0.22);
  transform: translateY(0);
}

/* ── btn-primary — glass accent (teal) ── */
.btn-primary {
  background-color: var(--glass-white-bg);
  color: var(--color-accent-strong);
  border-color: var(--glass-accent-border);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.40);
}
.btn-primary:hover {
  background-color: rgba(61, 92, 232, 0.16);
  border-color: rgba(61, 92, 232, 0.42);
  color: var(--color-accent-strong);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.40),
              0 0 0 3px rgba(61, 92, 232, 0.10);
  transform: translateY(-1px);
}
.btn-primary:active {
  transform: translateY(0);
}

/* ── btn-secondary — glass neutral ── */
.btn-secondary {
  background-color: var(--glass-secondary-bg);
  color: var(--color-text-muted);
  border-color: var(--glass-secondary-border);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.50);
}
.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.35);
  border-color: rgba(62, 95, 230, 0.20);
  color: var(--color-text);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.50),
              0 0 0 3px rgba(0, 0, 0, 0.04);
  transform: translateY(-1px);
}
.btn-secondary:active {
  transform: translateY(0);
}

/* ── btn-danger — glass danger ── */
.btn-danger {
  background-color: var(--glass-danger-bg);
  color: var(--color-error);
  border-color: var(--glass-danger-border);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.30);
}
.btn-danger:hover {
  background-color: rgba(217, 83, 79, 0.16);
  border-color: rgba(217, 83, 79, 0.42);
  color: var(--color-error);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.30),
              0 0 0 3px rgba(217, 83, 79, 0.10);
  transform: translateY(-1px);
}
.btn-danger:active {
  transform: translateY(0);
}

/* ── btn-ghost — sutil, sin fondo en reposo ── */
.btn-ghost {
  background-color: transparent;
  color: var(--color-text-muted);
  border-color: transparent;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}
.btn-ghost::after { display: none; }
.btn-ghost:hover {
  background-color: rgba(0, 0, 0, 0.05);
  color: var(--color-text);
  border-color: transparent;
}
[data-theme="dark"] .btn-ghost:hover {
  background-color: rgba(255, 255, 255, 0.07);
}

/* ── Tamaños ── */
.btn-sm {
  font-size: var(--text-xs);
  padding: var(--space-1) var(--space-3);
  min-height: 32px;
  border-radius: var(--radius-sm);
}
.btn-lg {
  font-size: var(--text-base);
  padding: var(--space-3) var(--space-6);
  min-height: 52px;
  border-radius: var(--radius-lg);
}
.btn-icon      { padding: var(--space-2); min-width: 44px; }
.btn-icon.btn-sm { padding: var(--space-1); min-width: 32px; min-height: 32px; }
.btn-block { width: 100%; }

/* ── Dark mode ajustes ── */
[data-theme="dark"] .btn-brand {
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.10);
}
[data-theme="dark"] .btn-secondary {
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}