/* ═══════════════════════════════════════════════════════════════
   OmicsLab — Shared Component Library (Prompt 1)
   Reusable atoms using design tokens from tokens.css.
   ═══════════════════════════════════════════════════════════════ */

/* ═════ BUTTONS ═════ */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: var(--space-2); padding: 0.42rem 0.9rem;
  border-radius: var(--radius-md); font-size: var(--text-sm);
  font-weight: 600; font-family: var(--font-sans);
  cursor: pointer; border: 1px solid transparent;
  text-decoration: none; white-space: nowrap;
  transition: background var(--dur-fast), border-color var(--dur-fast), opacity var(--dur-fast);
  line-height: 1.4;
}
.btn:disabled { opacity: .45; cursor: not-allowed; pointer-events: none; }

.btn-primary  { background: var(--green-dim); border-color: var(--green); color: #fff; }
.btn-primary:hover  { background: #2ea043; }
.btn-secondary{ background: var(--bg-overlay); border-color: var(--border-muted); color: var(--text-secondary); }
.btn-secondary:hover{ background: #2d333b; }
.btn-ghost    { background: transparent; border-color: transparent; color: var(--text-muted); }
.btn-ghost:hover    { background: var(--bg-overlay); color: var(--text-secondary); border-color: var(--border-muted); }
.btn-danger   { background: var(--red-bg); border-color: rgba(255,107,107,.3); color: var(--red); }
.btn-danger:hover   { background: rgba(255,107,107,.16); }

.btn-sm { padding: 0.28rem 0.65rem; font-size: var(--text-xs); border-radius: var(--radius-sm); }
.btn-lg { padding: 0.55rem 1.25rem; font-size: var(--text-md); }
.btn-icon { padding: 0.38rem; border-radius: var(--radius-md); }
.btn-pill { border-radius: var(--radius-pill); }

/* ═════ BADGES ═════ */
.badge {
  display: inline-flex; align-items: center; gap: 0.2rem;
  padding: 0.1rem 0.45rem; border-radius: var(--radius-pill);
  font-size: 0.67rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em;
}
.badge-green  { background: var(--green-bg); color: var(--green); border: 1px solid rgba(63,185,80,.2); }
.badge-blue   { background: var(--blue-bg); color: var(--blue); border: 1px solid rgba(88,166,255,.2); }
.badge-red    { background: var(--red-bg); color: var(--red); border: 1px solid rgba(255,107,107,.2); }
.badge-yellow { background: var(--yellow-bg); color: var(--yellow); border: 1px solid rgba(227,179,65,.2); }
.badge-purple { background: var(--purple-bg); color: var(--purple); border: 1px solid rgba(188,140,255,.2); }
.badge-orange { background: var(--orange-bg); color: var(--orange); border: 1px solid rgba(249,115,22,.2); }
.badge-muted  { background: var(--bg-overlay); color: var(--text-muted); border: 1px solid var(--border-default); }

/* ═════ CARD ═════ */
.card {
  background: var(--bg-surface); border: 1px solid var(--border-default);
  border-radius: var(--radius-lg); padding: var(--space-5);
}
.card-sm { padding: var(--space-3) var(--space-4); border-radius: var(--radius-md); }
.card:hover { border-color: var(--border-muted); }

/* ═════ TAG ═════ */
.tag {
  display: inline-block; background: var(--bg-overlay);
  border: 1px solid var(--border-default); border-radius: var(--radius-sm);
  padding: 0.1rem 0.42rem; font-size: 0.67rem; color: var(--text-muted);
}

/* ═════ FORM CONTROLS ═════ */
.input, .select, .textarea {
  background: var(--bg-canvas); border: 1px solid var(--border-muted);
  border-radius: var(--radius-md); padding: 0.42rem 0.65rem;
  font-size: var(--text-sm); color: var(--text-primary);
  font-family: var(--font-sans); outline: none; width: 100%; box-sizing: border-box;
  transition: border-color var(--dur-fast);
}
.input:focus, .select:focus, .textarea:focus { border-color: var(--blue); }
.input::placeholder { color: var(--text-faint); }
.textarea { min-height: 80px; resize: vertical; }

/* ═════ DIVIDER ═════ */
.divider {
  height: 1px; background: var(--border-default);
  border: none; margin: var(--space-4) 0;
}
.divider-label {
  display: flex; align-items: center; gap: var(--space-3);
  font-size: var(--text-xs); color: var(--text-faint); margin: var(--space-4) 0;
}
.divider-label::before, .divider-label::after {
  content: ''; flex: 1; height: 1px; background: var(--border-default);
}

/* ═════ AVATAR ═════ */
.avatar {
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 50%; background: var(--bg-overlay); color: var(--text-muted);
  font-weight: 700; font-size: var(--text-sm); overflow: hidden; flex-shrink: 0;
}
.avatar-sm { width: 24px; height: 24px; font-size: 0.65rem; }
.avatar-md { width: 36px; height: 36px; }
.avatar-lg { width: 52px; height: 52px; font-size: var(--text-lg); }
.avatar img { width: 100%; height: 100%; object-fit: cover; }

/* ═════ SPINNER ═════ */
.spinner {
  width: 18px; height: 18px; border-radius: 50%;
  border: 2px solid var(--border-muted);
  border-top-color: var(--green);
  animation: spin 0.7s linear infinite;
  display: inline-block; flex-shrink: 0;
}
.spinner-sm { width: 13px; height: 13px; border-width: 2px; }
.spinner-lg { width: 28px; height: 28px; border-width: 3px; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ═════ SKELETON ═════ */
.sk-shimmer {
  background: linear-gradient(
    90deg,
    var(--bg-overlay) 25%,
    var(--border-muted) 50%,
    var(--bg-overlay) 75%
  );
  background-size: 200% 100%;
  animation: sk-shimmer 1.4s ease-in-out infinite;
  border-radius: var(--radius-md);
}
@keyframes sk-shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.sk-line  { height: 12px; border-radius: var(--radius-pill); margin-bottom: var(--space-2); }
.sk-block { border-radius: var(--radius-md); }
.sk-h-sm  { height: 8px; }
.sk-h-md  { height: 12px; }
.sk-h-lg  { height: 18px; }
.sk-h-xl  { height: 24px; }
.sk-h-300 { height: 300px; }
.sk-w-20  { width: 20%; }
.sk-w-40  { width: 40%; }
.sk-w-60  { width: 60%; }
.sk-w-80  { width: 80%; }
.sk-w-full{ width: 100%; }

/* Skeleton page layout helpers */
.skeleton-page { padding: var(--space-5) var(--space-4); }
.skeleton-header { margin-bottom: var(--space-6); }
.skeleton-two-col { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4); }
.skeleton-row { display: flex; gap: var(--space-3); align-items: flex-start; margin-bottom: var(--space-3); }

/* ═════ NAV PROGRESS BAR ═════ */
#nav-progress {
  position: fixed; top: 0; left: 0; height: 2px;
  background: var(--green);
  box-shadow: 0 0 8px var(--green);
  z-index: var(--z-topmost);
  width: 0;
  pointer-events: none;
  opacity: 0;
  transition: width var(--dur-normal) var(--ease-out), opacity var(--dur-fast);
}
#nav-progress.np-active { opacity: 1; }

/* ═════ ARIA LIVE REGION ═════ */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
#a11y-announcer {
  position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden;
}