/* ============================================================
   OMZE ACADEMY OS — Botões
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  line-height: 1;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  text-decoration: none;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  user-select: none;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn svg {
  width: 16px; height: 16px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}

/* Sizes */
.btn-xs { padding: 6px 12px; font-size: var(--text-xs); border-radius: var(--radius-sm); }
.btn-sm { padding: 8px 16px; }
.btn-lg { padding: 14px 28px; font-size: var(--text-base); border-radius: var(--radius-lg); }
.btn-xl { padding: 18px 36px; font-size: var(--text-lg); border-radius: var(--radius-lg); }
.btn-block { width: 100%; }

/* Primary — Accent */
.btn-primary {
  background: linear-gradient(135deg, var(--accent-dark), var(--accent));
  color: var(--bg-primary);
  border-color: transparent;
  font-weight: var(--font-semi);
  box-shadow: 0 4px 16px rgba(0, 212, 170, 0.25);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  box-shadow: 0 6px 24px rgba(0, 212, 170, 0.35);
  transform: translateY(-1px);
  color: var(--bg-primary);
}

.btn-primary:active { transform: translateY(0); }

/* Secondary — Outline */
.btn-secondary {
  background: transparent;
  color: var(--accent);
  border-color: var(--accent-border);
}

.btn-secondary:hover {
  background: var(--accent-muted);
  border-color: var(--accent);
  color: var(--accent);
}

/* Ghost */
.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: transparent;
}

.btn-ghost:hover {
  background: var(--bg-card);
  color: var(--text-primary);
}

/* Dark */
.btn-dark {
  background: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--border);
}

.btn-dark:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-light);
}

/* Danger */
.btn-danger {
  background: var(--danger-muted);
  color: var(--danger);
  border-color: rgba(239,68,68,0.2);
}

.btn-danger:hover {
  background: var(--danger);
  color: white;
  border-color: var(--danger);
}

/* Success */
.btn-success {
  background: var(--success-muted);
  color: var(--success);
  border-color: rgba(16,185,129,0.2);
}

.btn-success:hover {
  background: var(--success);
  color: white;
}

/* Gold / Elite */
.btn-gold {
  background: linear-gradient(135deg, var(--gold-dark), var(--gold));
  color: var(--bg-primary);
  font-weight: var(--font-semi);
  box-shadow: 0 4px 16px rgba(201,168,76,0.25);
}

.btn-gold:hover {
  box-shadow: 0 6px 24px rgba(201,168,76,0.4);
  transform: translateY(-1px);
  color: var(--bg-primary);
}

/* Icon only */
.btn-icon {
  padding: 8px;
  border-radius: var(--radius-sm);
  aspect-ratio: 1;
}

.btn-icon.btn-sm { padding: 6px; }
.btn-icon.btn-lg { padding: 12px; }

/* Loading state */
.btn.loading {
  pointer-events: none;
}

.btn.loading::before {
  content: '';
  width: 14px; height: 14px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 600ms linear infinite;
  margin-right: 6px;
}

/* ============================================================
   FORM ELEMENTS
   ============================================================ */

.form-group { margin-bottom: var(--space-5); }

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.form-label.required::after {
  content: ' *';
  color: var(--danger);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--text-primary);
  transition: var(--transition);
  outline: none;
  appearance: none;
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-muted);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-muted);
}

.form-input:invalid,
.form-input.error {
  border-color: var(--danger);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238A9BB0' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
  cursor: pointer;
}

.form-hint {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-top: var(--space-1);
}

.form-error {
  font-size: var(--text-xs);
  color: var(--danger);
  margin-top: var(--space-1);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Checkbox / Radio */
.form-check {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  cursor: pointer;
  user-select: none;
}

.form-check input[type="checkbox"],
.form-check input[type="radio"] {
  width: 16px; height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
  margin-top: 2px;
}

.form-check-label {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

/* Input with icon */
.input-group {
  position: relative;
}

.input-group .input-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  width: 16px; height: 16px;
}

.input-group .form-input { padding-left: 38px; }

.input-group .input-action {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0;
  display: flex;
}

.input-group .input-action:hover { color: var(--text-primary); }