/* ════════════════════════════════════════════════════════════════════════
   DS Button primitive  (DS primitives phase — primitive 3 of 3)
   Refines the .btn system IN PLACE (class names unchanged → app-wide upgrade).
   Consumes tokens.css. No JS.

   Variants:  primary (cognac) · outline (secondary) · ghost (tertiary) · danger
   Sizes:     .btn-sm (32) · default md (38) · .btn-lg (46)
   States:    hover/active/focus-visible/disabled · loading = consumer text-swap
              + disabled + aria-busy (no spinner — reduced-motion friendly).
   Retired:   .btn-navy (mapped to .btn-primary).
   ════════════════════════════════════════════════════════════════════════ */

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  min-height: 40px; padding: 0 16px;                 /* md (default, DS h40) */
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: var(--text-base); font-weight: 600; letter-spacing: -.01em; line-height: 1;
  cursor: pointer; text-decoration: none; white-space: nowrap;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease),
              color var(--dur) var(--ease), transform var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}
/* DS focus = cognac ring (3px @ .35). Transparent outline kept for Windows High Contrast Mode. */
.btn:focus-visible { outline: 2px solid transparent; outline-offset: 2px; box-shadow: 0 0 0 3px var(--cf-ring); }

/* ── Variants ───────────────────────────────────────────── */
/* primary — the single dominant CTA. Hover is the one tactile micro-moment. */
.btn-primary { background: var(--accent); color: var(--cf-on-accent); }
.btn-primary:hover { background: var(--accent-soft); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-primary:active { background: var(--cf-accent-pressed); transform: translateY(0); box-shadow: none; }

/* outline — secondary action (flat hover, no lift) */
.btn-outline { background: transparent; border-color: var(--border); color: var(--text); }
.btn-outline:hover { background: var(--accent-bg); border-color: var(--accent-soft); }

/* ghost — tertiary / inline (Cancel, row actions) */
.btn-ghost { background: transparent; border-color: transparent; color: var(--text); }
.btn-ghost:hover { background: var(--gray-100); }

/* danger — destructive confirm */
.btn-danger { background: var(--error); color: var(--cf-on-accent); }
.btn-danger:hover { background: color-mix(in srgb, var(--error) 88%, var(--cf-black)); }

/* ── Sizes ──────────────────────────────────────────────── */
.btn-sm { min-height: 32px; padding: 0 12px; font-size: var(--text-sm); gap: 5px; }
.btn-lg { min-height: 46px; padding: 0 22px; font-size: var(--text-md); }

/* ── Icon-only (REQUIRES aria-label on the element) ─────── */
.btn--icon { width: 44px; min-height: 44px; padding: 0; }   /* 44×44 tap target */

/* ── Disabled — muted + legible (not bare opacity) ──────── */
.btn:disabled, .btn[disabled], .btn[aria-disabled="true"] {
  background: var(--gray-100); border-color: var(--gray-100); color: var(--gray-400);
  cursor: not-allowed; transform: none; box-shadow: none; pointer-events: none;
}
.btn-outline:disabled, .btn-outline[disabled] { background: transparent; border-color: var(--border); color: var(--gray-400); }
.btn-ghost:disabled, .btn-ghost[disabled]     { background: transparent; border-color: transparent; color: var(--gray-400); }

/* ── Loading — consumer swaps label (e.g. "Save"→"Saving…"), sets disabled + aria-busy="true" ── */
.btn[aria-busy="true"] { cursor: progress; }

/* ── HUB Deploy 7e-0a button variants ────────────────────────────────
   Backing CSS for ds_button macro variants:
     ghost-link        anchor styled as a low-weight inline link button
     ghost-secondary   ghost with muted text + softer hover
     saved-state       cognac check-icon + "Saved" indicator (read-only state) */

.btn-ghost-link {
  padding-left: 0;
  padding-right: 0;
  background: transparent;
  border: 0;
  color: var(--accent);
  font-weight: 500;
  text-decoration: none;
}
.btn-ghost-link:hover {
  text-decoration: underline;
  background: transparent;
}
.btn-ghost-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn-ghost-secondary {
  color: var(--muted);
  border-color: var(--border);
}
.btn-ghost-secondary:hover {
  color: var(--text);
  border-color: color-mix(in srgb, var(--text) 30%, var(--border));
}

/* Saved state (7e-1: stronger button affordance, not text-like) */
.btn-saved-state {
  background: color-mix(in srgb, var(--accent) 6%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 20%, var(--border));
  color: var(--text);
  cursor: default;
  padding: 6px 12px;
  font-weight: 500;
  font-size: 13px;
}
.btn-saved-state:hover {
  background: color-mix(in srgb, var(--accent) 6%, transparent);
  color: var(--text);
}
.btn-saved-state svg {
  color: var(--accent);
  margin-right: 6px;
  flex-shrink: 0;
}
.btn-saved-state .cf-saved-meta {
  color: var(--muted);
  margin-left: 4px;
  font-weight: 400;
}

/* ── HUB Deploy 7e-1 .btn-disabled (visible disabled state) ─────────
   Dedicated variant for "disabled by design" placeholders (Stripe portal,
   2FA Coming Soon). Different from .btn[disabled] (transparent dim text).
   Clear button affordance: visible border + soft accent-tinted fill +
   muted text + cursor:not-allowed. Tooltip rendered via title attr. */
.btn-disabled {
  background: color-mix(in srgb, var(--accent) 4%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 25%, var(--border));
  color: var(--muted);
  cursor: not-allowed;
  opacity: 0.85;
  pointer-events: auto;
}
.btn-disabled:hover {
  background: color-mix(in srgb, var(--accent) 6%, transparent);
  border-color: color-mix(in srgb, var(--accent) 30%, var(--border));
  color: var(--muted);
}