/* ============================================================
 * Pukdee Design System — Components v1.0
 * 
 * Button, Card, Form, Stat, Modal, Toast, Toggle, Step
 * Load หลัง base.css ทุกครั้ง
 * ============================================================ */

/* ============================================================
 * 1. BUTTON
 * ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: 38px;
  padding: 0 var(--space-4);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  line-height: 1;
  border-radius: var(--radius-md);
  border: 0.5px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  user-select: none;
  transition: background var(--transition-fast),
              border-color var(--transition-fast),
              color var(--transition-fast),
              box-shadow var(--transition-fast),
              transform var(--transition-fast);
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

/* Sizes */
.btn-sm { height: 32px; padding: 0 var(--space-3); font-size: 13px; }
.btn-lg { height: 46px; padding: 0 var(--space-6); font-size: var(--text-body); }
.btn-block { width: 100%; }

/* Variants */
.btn-primary {
  background: var(--brand-500);
  color: #fff;
}
.btn-primary:hover {
  background: var(--brand-700);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--brand-700);
  border-color: var(--brand-500);
}
.btn-secondary:hover {
  background: var(--brand-50);
}

.btn-ghost {
  background: transparent;
  color: var(--text-sub);
  border-color: var(--border);
}
.btn-ghost:hover {
  background: var(--bg-muted);
  color: var(--text-body);
}

.btn-danger {
  background: var(--danger-bg);
  color: var(--danger-text);
  border-color: var(--danger-border);
}
.btn-danger:hover {
  background: var(--danger-strong);
  color: #fff;
  border-color: var(--danger-strong);
}

.btn-link {
  height: auto;
  padding: 0;
  background: transparent;
  color: var(--brand-500);
  border: none;
}
.btn-link:hover {
  color: var(--brand-700);
  text-decoration: underline;
}

/* Loading state */
.btn-loading {
  pointer-events: none;
  position: relative;
  color: transparent !important;
}
.btn-loading::after {
  content: '';
  position: absolute;
  width: 14px;
  height: 14px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: btn-spin 0.6s linear infinite;
  color: var(--brand-500);
}
.btn-primary.btn-loading::after,
.btn-danger.btn-loading::after { color: #fff; }

@keyframes btn-spin {
  to { transform: rotate(360deg); }
}

/* ============================================================
 * 2. CARD
 * ============================================================ */
.card {
  background: var(--bg-surface);
  border: 0.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}

.card-elevated {
  box-shadow: var(--shadow-sm);
}

.card-hover {
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}
.card-hover:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

.card-header {
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-4);
  border-bottom: 0.5px solid var(--border);
}

.card-title {
  font-size: var(--text-h3);
  font-weight: var(--weight-medium);
  color: var(--text-heading);
  margin-bottom: var(--space-1);
}

.card-subtitle {
  font-size: var(--text-cap);
  color: var(--text-sub);
}

.card-footer {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 0.5px solid var(--border);
}

@media (max-width: 640px) {
  .card { padding: var(--space-4); }
}

/* ============================================================
 * 3. STAT CARD (Dashboard KPIs)
 * ============================================================ */
.stat-card {
  background: var(--bg-subtle);
  border: 0.5px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  transition: border-color var(--transition-fast);
}
.stat-card:hover {
  border-color: var(--border-strong);
}

.stat-label {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-mini);
  font-weight: var(--weight-medium);
  color: var(--text-sub);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: var(--space-2);
}

.stat-label .ti {
  font-size: 13px;
}

.stat-value {
  font-size: 22px;
  font-weight: var(--weight-medium);
  color: var(--text-heading);
  line-height: 1.1;
  font-feature-settings: 'tnum'; /* tabular numbers */
}

.stat-value-sub {
  font-size: var(--text-h3);
  color: var(--text-mute);
  font-weight: var(--weight-regular);
}

.stat-delta {
  font-size: var(--text-mini);
  margin-top: var(--space-1);
  display: flex;
  align-items: center;
  gap: 3px;
}

.stat-delta-up    { color: var(--success-text); }
.stat-delta-down  { color: var(--danger-text); }
.stat-delta-neutral { color: var(--text-mute); }

/* Stat — variant with accent stripe */
.stat-card-accent {
  position: relative;
  overflow: hidden;
}
.stat-card-accent::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--brand-500);
}
.stat-card-accent.is-warning::before { background: var(--accent-400); }
.stat-card-accent.is-danger::before  { background: var(--danger-strong); }
.stat-card-accent.is-info::before    { background: var(--info-strong); }

/* ============================================================
 * 4. FORM FIELDS
 * ============================================================ */
.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin-bottom: var(--space-3);
}

.field-label {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-cap);
  font-weight: var(--weight-medium);
  color: var(--text-body);
}

.field-label .required {
  color: var(--danger-strong);
  font-size: 14px;
}

.field-hint {
  font-size: var(--text-mini);
  color: var(--text-mute);
  font-weight: var(--weight-regular);
  text-transform: none;
  letter-spacing: 0;
}

.field-error {
  font-size: var(--text-cap);
  color: var(--danger-text);
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-top: 2px;
}

.field-success {
  font-size: var(--text-cap);
  color: var(--success-text);
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

/* Input — base */
.input {
  height: 38px;
  padding: 0 var(--space-3);
  font-family: var(--font-sans);
  font-size: var(--text-body);
  color: var(--text-body);
  background: var(--bg-surface);
  border: 0.5px solid var(--border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast),
              box-shadow var(--transition-fast);
  width: 100%;
}

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

.input:hover:not(:disabled):not(:focus) {
  border-color: var(--border-strong);
}

.input:focus {
  outline: none;
  border-color: var(--brand-500);
  border-width: 1.5px;
  box-shadow: var(--shadow-focus);
}

.input:disabled {
  background: var(--bg-muted);
  cursor: not-allowed;
  opacity: 0.6;
}

.input[aria-invalid="true"],
.input.is-error {
  border-color: var(--danger-strong);
}
.input[aria-invalid="true"]:focus,
.input.is-error:focus {
  box-shadow: 0 0 0 3px rgba(226, 75, 74, 0.15);
}

/* Textarea */
.textarea {
  min-height: 96px;
  padding: var(--space-3);
  line-height: var(--leading-normal);
  resize: vertical;
}

/* Select */
.select {
  appearance: none;
  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='%235F5E5A' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  padding-right: var(--space-8);
}

/* Input with icon */
.input-group {
  position: relative;
}
.input-group .input {
  padding-left: 38px;
}
.input-group-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-mute);
  pointer-events: none;
}

/* Checkbox & Radio */
.check {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  font-size: var(--text-sm);
  color: var(--text-body);
  user-select: none;
}

.check input[type="checkbox"],
.check input[type="radio"] {
  width: 18px;
  height: 18px;
  accent-color: var(--brand-500);
  cursor: pointer;
}

/* ============================================================
 * 5. TOGGLE SWITCH
 * ============================================================ */
.toggle {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}

.toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--border-strong);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background var(--transition-base);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background: #fff;
  border-radius: 50%;
  box-shadow: var(--shadow-xs);
  transition: transform var(--transition-base);
}

.toggle input:checked + .toggle-slider {
  background: var(--brand-500);
}

.toggle input:checked + .toggle-slider::before {
  transform: translateX(20px);
}

.toggle input:focus-visible + .toggle-slider {
  box-shadow: var(--shadow-focus);
}

/* Toggle group with label */
.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-3) 0;
}

.toggle-row-label {
  font-size: var(--text-sm);
  color: var(--text-body);
  font-weight: var(--weight-medium);
}

.toggle-row-hint {
  font-size: var(--text-cap);
  color: var(--text-mute);
  margin-top: 2px;
}

/* ============================================================
 * 6. STEP INDICATOR (Multi-step Wizard)
 * ============================================================ */
.steps {
  display: flex;
  align-items: flex-start;
  gap: 0;
  margin-bottom: var(--space-5);
}

.step {
  flex: 1;
  text-align: center;
  position: relative;
}

.step-dot {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  font-size: 13px;
  font-weight: var(--weight-medium);
  margin-bottom: var(--space-1);
  transition: background var(--transition-base), color var(--transition-base);
}

.step-label {
  display: block;
  font-size: var(--text-cap);
  color: var(--text-mute);
  font-weight: var(--weight-regular);
}

.step.is-active .step-dot  { background: var(--brand-500); color: #fff; }
.step.is-active .step-label { color: var(--brand-700); font-weight: var(--weight-medium); }

.step.is-done .step-dot    { background: var(--brand-700); color: #fff; }
.step.is-done .step-label  { color: var(--text-body); }

.step.is-todo .step-dot    { background: var(--bg-muted); color: var(--text-mute); }

.step-line {
  flex: 0 0 auto;
  width: 24px;
  height: 1.5px;
  background: var(--border);
  margin: 14px 0 0;
}
.step-line.is-active { background: var(--brand-500); }

@media (max-width: 640px) {
  .step-label { display: none; }
  .step-line { width: 16px; }
}

/* ============================================================
 * 7. BADGE & TAG
 * ============================================================ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px var(--space-2);
  font-size: var(--text-mini);
  font-weight: var(--weight-medium);
  border-radius: var(--radius-sm);
  background: var(--bg-muted);
  color: var(--text-sub);
}

.badge-success { background: var(--success-bg); color: var(--success-text); }
.badge-warning { background: var(--warning-bg); color: var(--warning-text); }
.badge-danger  { background: var(--danger-bg); color: var(--danger-text); }
.badge-info    { background: var(--info-bg); color: var(--info-text); }
.badge-brand   { background: var(--brand-50); color: var(--brand-700); }

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

/* ============================================================
 * 8. TOAST / ALERT (inline)
 * ============================================================ */
.toast,
.alert {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  border: 0.5px solid;
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
}

.toast .ti,
.alert .ti {
  font-size: 18px;
  flex-shrink: 0;
  margin-top: 1px;
}

.toast-success, .alert-success {
  background: var(--success-bg);
  color: var(--success-text);
  border-color: var(--success-border);
}
.toast-warning, .alert-warning {
  background: var(--warning-bg);
  color: var(--warning-text);
  border-color: var(--warning-border);
}
.toast-danger, .alert-danger {
  background: var(--danger-bg);
  color: var(--danger-text);
  border-color: var(--danger-border);
}
.toast-info, .alert-info {
  background: var(--info-bg);
  color: var(--info-text);
  border-color: var(--info-border);
}

/* Toast container (top-right floating) */
.toast-container {
  position: fixed;
  top: var(--space-4);
  right: var(--space-4);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-width: 380px;
  pointer-events: none;
}

.toast-container .toast {
  pointer-events: auto;
  box-shadow: var(--shadow-lg);
  animation: toast-in 0.25s ease;
}

@keyframes toast-in {
  from { opacity: 0; transform: translateX(20px); }
  to { opacity: 1; transform: translateX(0); }
}

@media (max-width: 640px) {
  .toast-container {
    left: var(--space-4);
    right: var(--space-4);
    max-width: none;
  }
}

/* ============================================================
 * 9. MODAL
 * ============================================================ */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: var(--z-modal-bg);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}
.modal-backdrop.is-open {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.95);
  width: calc(100% - var(--space-8));
  max-width: 480px;
  max-height: calc(100vh - var(--space-8));
  background: var(--bg-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  z-index: var(--z-modal);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base), transform var(--transition-base);
  display: flex;
  flex-direction: column;
}

.modal.is-open {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, -50%) scale(1);
}

.modal-lg { max-width: 720px; }
.modal-sm { max-width: 360px; }

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6) var(--space-3);
  border-bottom: 0.5px solid var(--border);
}

.modal-title {
  font-size: var(--text-h2);
  font-weight: var(--weight-medium);
  color: var(--text-heading);
}

.modal-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--text-sub);
  transition: background var(--transition-fast);
}
.modal-close:hover {
  background: var(--bg-muted);
  color: var(--text-body);
}

.modal-body {
  padding: var(--space-5) var(--space-6);
  overflow-y: auto;
  flex: 1;
}

.modal-footer {
  display: flex;
  gap: var(--space-2);
  justify-content: flex-end;
  padding: var(--space-3) var(--space-6) var(--space-5);
  border-top: 0.5px solid var(--border);
}

/* Mobile: fullscreen sheet from bottom */
@media (max-width: 640px) {
  .modal {
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    transform: translateY(100%);
    width: 100%;
    max-width: none;
    max-height: 90vh;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  }
  .modal.is-open {
    transform: translateY(0);
  }
  .modal-footer {
    flex-direction: column-reverse;
  }
  .modal-footer .btn { width: 100%; }
}

/* ============================================================
 * 10. TABS
 * ============================================================ */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--space-5);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.tab {
  flex-shrink: 0;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--text-sub);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.tab:hover {
  color: var(--text-body);
}
.tab.is-active {
  color: var(--brand-700);
  border-bottom-color: var(--brand-500);
}

/* Vertical tabs (settings sidebar style) */
.tabs-vertical {
  flex-direction: column;
  border-bottom: none;
  border-right: 1px solid var(--border);
  margin-right: var(--space-5);
}
.tabs-vertical .tab {
  border-bottom: none;
  border-right: 2px solid transparent;
  justify-content: flex-start;
  width: 100%;
}
.tabs-vertical .tab.is-active {
  border-right-color: var(--brand-500);
  background: var(--brand-50);
}

/* ============================================================
 * 11. STICKY SAVE BAR (สำหรับ Settings form)
 * ============================================================ */
.save-bar {
  position: sticky;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  padding: var(--space-3) var(--space-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.04);
  margin-top: var(--space-6);
}

.save-bar-status {
  font-size: var(--text-cap);
  color: var(--text-sub);
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.save-bar-actions {
  display: flex;
  gap: var(--space-2);
}

.save-bar.has-unsaved {
  background: var(--warning-bg);
  border-top-color: var(--warning-border);
}
.save-bar.has-unsaved .save-bar-status {
  color: var(--warning-text);
}

/* ============================================================
 * 12. EMPTY STATE
 * ============================================================ */
.empty {
  text-align: center;
  padding: var(--space-10) var(--space-5);
  color: var(--text-sub);
}

.empty-icon {
  font-size: 48px;
  color: var(--text-mute);
  margin-bottom: var(--space-3);
  display: inline-block;
}

.empty-title {
  font-size: var(--text-h3);
  font-weight: var(--weight-medium);
  color: var(--text-body);
  margin-bottom: var(--space-1);
}

.empty-desc {
  font-size: var(--text-sm);
  color: var(--text-mute);
  margin-bottom: var(--space-4);
}

/* ============================================================
 * 13. SKELETON LOADER
 * ============================================================ */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-muted) 25%,
    var(--bg-subtle) 50%,
    var(--bg-muted) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-pulse 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeleton-pulse {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-text { height: 14px; margin-bottom: 6px; }
.skeleton-title { height: 22px; width: 60%; margin-bottom: var(--space-2); }
.skeleton-box { height: 80px; border-radius: var(--radius-md); }

/* ============================================================
 * 14. DIVIDER
 * ============================================================ */
.divider {
  height: 1px;
  background: var(--border);
  margin: var(--space-5) 0;
  border: none;
}

.divider-vertical {
  width: 1px;
  height: 100%;
  background: var(--border);
  margin: 0 var(--space-3);
}

/* ============================================================
 * 15. AVATAR
 * ============================================================ */
.avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--brand-100);
  color: var(--brand-800);
  font-weight: var(--weight-medium);
  font-size: var(--text-sm);
  overflow: hidden;
  flex-shrink: 0;
}

.avatar img { width: 100%; height: 100%; object-fit: cover; }

.avatar-sm { width: 28px; height: 28px; font-size: var(--text-cap); }
.avatar-lg { width: 56px; height: 56px; font-size: var(--text-h2); }