/* ============================================
   COMPONENTS.CSS — Reusable UI Components
   ============================================ */

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-weight: 600;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration) var(--ease);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15) 0%, transparent 50%);
  opacity: 0;
  transition: opacity var(--duration) var(--ease);
}

.btn:hover::after {
  opacity: 1;
}

.btn:active {
  transform: scale(0.97);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--fs-sm);
  border-radius: var(--radius);
}

.btn-md {
  padding: var(--space-3) var(--space-6);
  font-size: var(--fs-base);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--fs-lg);
}

.btn-block {
  width: 100%;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: #FFFFFF;
  box-shadow: 0 4px 16px rgba(30,64,175,0.3);
}

.btn-primary:hover {
  box-shadow: 0 8px 24px rgba(30,64,175,0.4);
  transform: translateY(-2px);
}

.btn-primary:active {
  transform: translateY(0) scale(0.97);
}

.btn-outline {
  background: transparent;
  border-color: var(--primary);
  color: var(--primary);
}

.btn-outline:hover {
  background: var(--primary);
  color: #FFFFFF;
  box-shadow: 0 4px 16px rgba(30,64,175,0.3);
  transform: translateY(-2px);
}

.btn-success {
  background: linear-gradient(135deg, #25D366 0%, #128C7E 100%);
  color: #FFFFFF;
  box-shadow: 0 4px 16px rgba(37,211,102,0.3);
}

.btn-success:hover {
  box-shadow: 0 8px 24px rgba(37,211,102,0.4);
  transform: translateY(-2px);
}

.btn .btn-loading {
  display: none;
}

.btn.loading .btn-text {
  opacity: 0;
}

.btn.loading .btn-loading {
  display: flex;
}

.btn.loading .btn-loading svg {
  animation: spin 1s linear infinite;
}

/* --- Cards --- */
.card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  transition: all var(--duration) var(--ease);
}

.card:hover {
  border-color: var(--primary-100);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

/* --- Form Elements --- */
.form-group {
  margin-bottom: var(--space-5);
  position: relative;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}

.form-label {
  display: block;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--fs-base);
  color: var(--text-primary);
  background: var(--bg-primary);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  transition: all var(--duration) var(--ease);
  outline: none;
}

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

.form-input:focus {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 4px rgba(59,130,246,0.1);
}

.form-input.error {
  border-color: var(--error);
  box-shadow: 0 0 0 4px rgba(239,68,68,0.1);
}

.form-input.success {
  border-color: var(--success);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.form-error {
  display: none;
  font-size: var(--fs-xs);
  color: var(--error);
  margin-top: var(--space-1);
}

.form-group.has-error .form-error {
  display: block;
}

.char-counter {
  text-align: right;
  font-size: var(--fs-xs);
  color: var(--text-muted);
  margin-top: var(--space-1);
}

/* --- Badge --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  font-size: var(--fs-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  background: var(--accent-light);
  color: var(--accent-hover);
}

/* --- Modal --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration) var(--ease);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px) scale(0.95);
  transition: transform var(--duration-slow) var(--ease-bounce);
  position: relative;
}

.modal-overlay.active .modal {
  transform: translateY(0) scale(1);
}

.modal-close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--text-muted);
  border-radius: var(--radius);
  transition: all var(--duration) var(--ease);
  z-index: 1;
}

.modal-close:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.modal-header {
  padding: var(--space-8) var(--space-8) var(--space-4);
}

.modal-title {
  font-size: var(--fs-2xl);
}

.modal-body {
  padding: 0 var(--space-8) var(--space-6);
  color: var(--text-secondary);
  line-height: 1.7;
}

.modal-footer {
  padding: 0 var(--space-8) var(--space-8);
  display: flex;
  gap: var(--space-3);
  justify-content: flex-end;
}

/* --- Toast Notifications --- */
.toast-container {
  position: fixed;
  top: calc(var(--navbar-height) + var(--space-4));
  right: var(--space-4);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  min-width: 320px;
  max-width: 420px;
  pointer-events: auto;
  transform: translateX(120%);
  transition: transform var(--duration-slow) var(--ease-bounce);
  position: relative;
  overflow: hidden;
}

.toast.show {
  transform: translateX(0);
}

.toast-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.toast-content {
  flex: 1;
}

.toast-message {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text-primary);
}

.toast-close {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  transition: all var(--duration-fast) var(--ease);
}

.toast-close:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.toast-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 3px;
  background: var(--primary);
  transition: width linear;
}

.toast.success { border-left: 4px solid var(--success); }
.toast.success .toast-icon { color: var(--success); }
.toast.success .toast-progress { background: var(--success); }

.toast.error { border-left: 4px solid var(--error); }
.toast.error .toast-icon { color: var(--error); }
.toast.error .toast-progress { background: var(--error); }

.toast.warning { border-left: 4px solid var(--warning); }
.toast.warning .toast-icon { color: var(--warning); }
.toast.warning .toast-progress { background: var(--warning); }

.toast.info { border-left: 4px solid var(--primary); }
.toast.info .toast-icon { color: var(--primary); }
.toast.info .toast-progress { background: var(--primary); }

/* --- Accordion --- */
.accordion-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-3);
  overflow: hidden;
  transition: all var(--duration) var(--ease);
}

.accordion-item:hover {
  border-color: var(--primary-100);
}

.accordion-item.active {
  border-color: var(--primary-light);
  box-shadow: 0 2px 12px rgba(30,64,175,0.08);
}

.accordion-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  text-align: left;
  font-weight: 600;
  color: var(--text-primary);
  gap: var(--space-4);
  transition: color var(--duration) var(--ease);
}

.accordion-trigger:hover {
  color: var(--primary);
}

.accordion-icon {
  flex-shrink: 0;
  color: var(--primary);
  transition: transform var(--duration) var(--ease);
}

.accordion-item.active .accordion-icon {
  transform: rotate(45deg);
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--duration-slow) var(--ease);
}

.accordion-body {
  padding: 0 var(--space-6) var(--space-6);
  color: var(--text-secondary);
  line-height: 1.8;
}

.accordion-body ul {
  list-style: disc;
  padding-left: var(--space-6);
  margin-top: var(--space-3);
}

.accordion-body ul li {
  margin-bottom: var(--space-2);
}

.accordion-body p {
  margin-bottom: var(--space-3);
}

/* --- Preloader --- */
.preloader {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity var(--duration-slow) var(--ease);
}

.preloader.hidden {
  opacity: 0;
  pointer-events: none;
}

.preloader-inner {
  text-align: center;
}

.preloader-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto var(--space-4);
}

.preloader-text {
  font-size: var(--fs-sm);
  color: var(--text-muted);
  font-weight: 500;
}

/* --- Back to Top --- */
.back-to-top {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: #FFFFFF;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--duration) var(--ease);
  z-index: 100;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* --- Spin Animation (for loading) --- */
@keyframes spin {
  to { transform: rotate(360deg); }
}