/* ============================================================
 *  ClassWeaver Button System v1 (2026-05-08 #3 polish)
 *  Depends on tokens.css (--cw-color-*, --cw-space-*)
 *  Strategy: Ant Design 5 inspired 5 levels + HTMX-safe shims
 *  Reference: pet-care-app + 3-LLM converged design (UX + CSS impl)
 * ============================================================ */

/* ---------- Base ---------- */
.btn,
.header-link,
.header-link-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 32px;
  padding: 4px 16px;
  border-radius: 6px;
  border: 1px solid transparent;
  font-family: inherit;
  font-size: 14px;
  font-weight: 400;
  line-height: 1.4;
  cursor: pointer;
  text-decoration: none;
  transition: background-color .2s, border-color .2s, color .2s, box-shadow .2s;
  user-select: none;
  white-space: nowrap;
  background: transparent;
  color: inherit;
}

.btn:focus-visible,
.header-link:focus-visible,
.header-link-primary:focus-visible {
  outline: 2px solid var(--cw-color-primary, #1677ff);
  outline-offset: 2px;
}

.btn:disabled,
.btn[disabled],
.btn[aria-disabled="true"] {
  background: #f5f5f5;
  color: rgba(0, 0, 0, .25);
  border-color: #d9d9d9;
  cursor: not-allowed;
  pointer-events: none;
  box-shadow: none;
}

/* ---------- Variants ---------- */

/* Primary — 1 page 1 main action (保存 / 生成 / 適用 等) */
.btn--primary,
.header-link-primary {
  background: var(--cw-color-primary, #1677ff);
  border-color: var(--cw-color-primary, #1677ff);
  color: #fff;
  font-weight: 600;
}
.btn--primary:hover,
.header-link-primary:hover {
  background: #4096ff;
  border-color: #4096ff;
  color: #fff;
  box-shadow: 0 2px 4px rgba(22, 119, 255, .2);
}
.btn--primary:active,
.header-link-primary:active {
  background: #0958d9;
  border-color: #0958d9;
  box-shadow: none;
}

/* Secondary — outlined 副 action */
.btn--secondary {
  background: #fff;
  color: rgba(0, 0, 0, .88);
  border-color: #d9d9d9;
}
.btn--secondary:hover {
  color: #4096ff;
  border-color: #4096ff;
}
.btn--secondary:active {
  color: #0958d9;
  border-color: #0958d9;
}

/* Ghost — toolbar / nav default (.header-link 互換) */
.btn--ghost,
.header-link {
  background: transparent;
  color: rgba(0, 0, 0, .65);
  border-color: transparent;
}
.btn--ghost:hover,
.header-link:hover {
  background: rgba(0, 0, 0, .04);
  color: rgba(0, 0, 0, .88);
}
.btn--ghost:active,
.header-link:active {
  background: rgba(0, 0, 0, .06);
}

/* Danger — outlined default + solid variant for destructive */
.btn--danger {
  background: #fff;
  color: var(--cw-color-danger, #ef4444);
  border-color: var(--cw-color-danger, #ef4444);
}
.btn--danger:hover {
  background: var(--cw-color-danger, #ef4444);
  color: #fff;
}
.btn--danger.btn--solid {
  background: var(--cw-color-danger, #ef4444);
  color: #fff;
}
.btn--danger.btn--solid:hover {
  background: #dc2626;
  border-color: #dc2626;
}

/* Link — text-style inline */
.btn--link {
  height: auto;
  padding: 0;
  background: transparent;
  border-color: transparent;
  color: var(--cw-color-primary, #1677ff);
}
.btn--link:hover {
  color: #4096ff;
  text-decoration: underline;
}

/* ---------- Sizes ---------- */
.btn--sm {
  height: 28px;
  padding: 0 12px;
  font-size: 12px;
}
.btn--md {
  /* default 32px */
}
.btn--lg {
  height: 40px;
  padding: 8px 20px;
  font-size: 16px;
}

/* ---------- Icon-only ---------- */
.btn--icon {
  width: 32px;
  padding: 0;
}
.btn--icon.btn--sm { width: 28px; }
.btn--icon.btn--lg { width: 40px; }

/* ---------- Icon spacing helper ---------- */
.btn__icon {
  display: inline-flex;
  flex: 0 0 auto;
  width: 1em;
  height: 1em;
  line-height: 1;
}
.btn__icon svg { width: 100%; height: 100%; display: block; }

/* ---------- HTMX in-flight feedback (non-breaking) ---------- */
.btn.htmx-request,
.header-link.htmx-request,
.header-link-primary.htmx-request {
  opacity: .7;
  cursor: progress;
}