/* ============================================================
   KELD — Reusable UI components
   Built entirely on tokens from keld-brand.css.
   Buttons · Cards · Inputs · Skeletons · States
   ============================================================ */

/* ---------- Buttons ---------- */
.kc-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--keld-space-2);
  padding: var(--keld-space-3) var(--keld-space-5);
  font-family: var(--keld-font-sans);
  font-size: var(--keld-fs-body);
  font-weight: var(--keld-fw-semibold);
  line-height: 1;
  border-radius: var(--keld-radius-pill);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--keld-dur-fast) var(--keld-ease),
              box-shadow var(--keld-dur-base) var(--keld-ease),
              background var(--keld-dur-base) var(--keld-ease);
}
.kc-btn:hover { transform: translateY(-1px); }
.kc-btn:active { transform: translateY(0); }
.kc-btn:focus-visible {
  outline: 2px solid var(--keld-bright);
  outline-offset: 2px;
}

.kc-btn--primary {
  background: linear-gradient(135deg, var(--keld) 0%, var(--keld-deep) 100%);
  color: #fff;
  box-shadow: var(--keld-glow);
}
.kc-btn--primary:hover { box-shadow: 0 0 34px rgba(108, 92, 231, 0.5); }

.kc-btn--ghost {
  background: transparent;
  color: var(--keld-text);
  border-color: var(--keld-hairline);
}
.kc-btn--ghost:hover {
  border-color: var(--keld-bright);
  background: rgba(162, 155, 254, 0.06);
}

.kc-btn--subtle {
  background: var(--keld-ink-3);
  color: var(--keld-text);
}
.kc-btn--subtle:hover { background: #222838; }

.kc-btn[disabled], .kc-btn--loading {
  opacity: 0.55;
  pointer-events: none;
}

/* ---------- Cards ---------- */
.kc-card {
  background: var(--keld-ink-2);
  border: 1px solid var(--keld-hairline);
  border-radius: var(--keld-radius-lg);
  padding: var(--keld-space-5);
  box-shadow: var(--keld-shadow-md);
}

.kc-card--glass {
  background: var(--keld-glass-bg);
  -webkit-backdrop-filter: blur(var(--keld-glass-blur));
  backdrop-filter: blur(var(--keld-glass-blur));
  border: 1px solid var(--keld-glass-border);
}

.kc-card__title {
  font-size: var(--keld-fs-h3);
  font-weight: var(--keld-fw-semibold);
  color: var(--keld-text);
  margin: 0 0 var(--keld-space-2);
}
.kc-card__sub {
  font-size: var(--keld-fs-body);
  color: var(--keld-muted);
  margin: 0;
}

/* ---------- Inputs ---------- */
.kc-field { display: flex; flex-direction: column; gap: var(--keld-space-2); }
.kc-label {
  font-size: var(--keld-fs-caption);
  font-weight: var(--keld-fw-medium);
  color: var(--keld-muted);
  letter-spacing: 0.02em;
}
.kc-input {
  width: 100%;
  padding: var(--keld-space-3) var(--keld-space-4);
  font-family: var(--keld-font-sans);
  font-size: var(--keld-fs-body);
  color: var(--keld-text);
  background: var(--keld-ink);
  border: 1px solid var(--keld-hairline);
  border-radius: var(--keld-radius-md);
  transition: border-color var(--keld-dur-base) var(--keld-ease),
              box-shadow var(--keld-dur-base) var(--keld-ease);
}
.kc-input::placeholder { color: rgba(148, 163, 184, 0.6); }
.kc-input:focus {
  outline: none;
  border-color: var(--keld);
  box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.22);
}
.kc-input[aria-invalid="true"] {
  border-color: #F87171;
  box-shadow: 0 0 0 3px rgba(248, 113, 113, 0.18);
}

/* ---------- Skeleton loaders ---------- */
.kc-skeleton {
  position: relative;
  overflow: hidden;
  background: var(--keld-ink-3);
  border-radius: var(--keld-radius-sm);
}
.kc-skeleton::after {
  content: "";
  position: absolute;
  inset: 0;
  transform: translateX(-100%);
  background: linear-gradient(90deg,
    rgba(162, 155, 254, 0) 0%,
    rgba(162, 155, 254, 0.10) 50%,
    rgba(162, 155, 254, 0) 100%);
  animation: kc-shimmer 1.3s var(--keld-ease) infinite;
}
.kc-skeleton--text { height: 12px; margin: 6px 0; }
.kc-skeleton--title { height: 20px; width: 45%; }
.kc-skeleton--line { height: 12px; width: 100%; }
.kc-skeleton--pill { height: 36px; border-radius: var(--keld-radius-pill); }
.kc-skeleton--avatar { height: 44px; width: 44px; border-radius: 50%; }

@keyframes kc-shimmer { 100% { transform: translateX(100%); } }

/* ---------- States (empty / success / error / loading) ---------- */
.kc-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--keld-space-3);
  padding: var(--keld-space-7) var(--keld-space-5);
  color: var(--keld-muted);
}
.kc-state__icon {
  width: 56px; height: 56px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--keld-ink-3);
  border: 1px solid var(--keld-hairline);
  color: var(--keld-bright);
  font-size: 22px;
}
.kc-state__title {
  font-size: var(--keld-fs-lg);
  font-weight: var(--keld-fw-semibold);
  color: var(--keld-text);
  margin: 0;
}
.kc-state--success .kc-state__icon { color: #34D399; border-color: rgba(52, 211, 153, 0.4); }
.kc-state--error   .kc-state__icon { color: #F87171; border-color: rgba(248, 113, 113, 0.4); }

/* Inline toast/alert */
.kc-alert {
  display: flex; align-items: center; gap: var(--keld-space-3);
  padding: var(--keld-space-3) var(--keld-space-4);
  border-radius: var(--keld-radius-md);
  font-size: var(--keld-fs-body);
  border: 1px solid var(--keld-hairline);
  background: var(--keld-ink-2);
  color: var(--keld-text);
  animation: kc-rise var(--keld-dur-slow) var(--keld-ease);
}
.kc-alert--success { border-color: rgba(52, 211, 153, 0.4); }
.kc-alert--error   { border-color: rgba(248, 113, 113, 0.4); }

@keyframes kc-rise {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  .kc-btn, .kc-input, .kc-alert { transition: none; }
  .kc-btn:hover { transform: none; }
  .kc-skeleton::after { animation: none; }
  .kc-alert { animation: none; }
}