/* ==========================================================================
   REUSABLE UI COMPONENTS
   Buttons, cards, inputs, dropdowns, checkboxes/radios, tables, tabs,
   modals, toasts, progress, loading, breadcrumbs, search, badges.
   ========================================================================== */

/* ---------------- Buttons ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: 40px;
  padding: 0 var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  white-space: nowrap;
  transition: background var(--duration-fast) var(--ease-standard),
              border-color var(--duration-fast) var(--ease-standard),
              transform var(--duration-fast) var(--ease-standard),
              box-shadow var(--duration-fast) var(--ease-standard);
}
.btn:active { transform: translateY(1px); }
.btn svg { width: 16px; height: 16px; }

.btn-primary {
  background: var(--color-accent);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover { background: var(--color-accent-hover); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-secondary {
  background: var(--color-bg-surface);
  color: var(--color-text-primary);
  border-color: var(--color-border-strong);
}
.btn-secondary:hover { background: var(--color-bg-hover); }

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

.btn-danger {
  background: var(--color-danger);
  color: #fff;
}
.btn-danger:hover { filter: brightness(1.06); }

.btn-sm { height: 32px; padding: 0 var(--space-4); font-size: var(--fs-xs); }
.btn-lg { height: 48px; padding: 0 var(--space-6); font-size: var(--fs-base); }
.btn-block { width: 100%; }
.btn-icon-only { width: 40px; padding: 0; }

/* ---------------- Cards ---------------- */
.card {
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
  transition: box-shadow var(--duration-base) var(--ease-standard), transform var(--duration-base) var(--ease-standard);
}

.card-interactive:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card__body { padding: var(--space-6); }
.card__header {
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}
.card__footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
}

/* KPI card */
.kpi-card {
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.kpi-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.kpi-card__icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-soft);
  color: var(--color-accent);
}
.kpi-card__icon svg { width: 18px; height: 18px; }
.kpi-card__label {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  font-weight: var(--fw-medium);
}
.kpi-card__value {
  font-size: var(--fs-2xl);
  font-weight: var(--fw-semibold);
  letter-spacing: -0.02em;
}
.kpi-card__delta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
}
.kpi-card__delta.is-positive { color: var(--color-success); }
.kpi-card__delta.is-negative { color: var(--color-danger); }

/* Placeholder / empty state card */
.placeholder-card {
  border: 1.5px dashed var(--color-border-strong);
  border-radius: var(--radius-lg);
  background: var(--color-bg-surface-2);
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: var(--space-3);
  color: var(--color-text-secondary);
}
.placeholder-card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--color-bg-sunken);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-2);
}
.placeholder-card__icon svg { width: 22px; height: 22px; }
.placeholder-card__title {
  font-size: var(--fs-md);
  font-weight: var(--fw-semibold);
  color: var(--color-text-primary);
}
.placeholder-card__desc {
  font-size: var(--fs-sm);
  max-width: 360px;
}

/* ---------------- Inputs ---------------- */
.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.field__label {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-primary);
}
.field__hint {
  font-size: var(--fs-xs);
  color: var(--color-text-tertiary);
}

.input, .select, .textarea {
  width: 100%;
  height: 42px;
  padding: 0 var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-strong);
  background: var(--color-bg-surface);
  color: var(--color-text-primary);
  font-size: var(--fs-sm);
  transition: border-color var(--duration-fast) var(--ease-standard), box-shadow var(--duration-fast) var(--ease-standard);
}
.textarea {
  height: auto;
  min-height: 96px;
  padding: var(--space-3) var(--space-4);
  resize: vertical;
}
.input::placeholder, .textarea::placeholder { color: var(--color-text-tertiary); }

.input:focus, .select:focus, .textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-soft);
}

.input-with-icon {
  position: relative;
}
.input-with-icon svg {
  position: absolute;
  left: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--color-text-tertiary);
}
.input-with-icon .input {
  padding-left: calc(var(--space-3) * 2 + 16px);
}

.select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%239aa4ac' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  padding-right: var(--space-8);
}

/* Checkbox */
.checkbox {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  font-size: var(--fs-sm);
  user-select: none;
}
.checkbox input {
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 5px;
  border: 1.5px solid var(--color-border-strong);
  background: var(--color-bg-surface);
  position: relative;
  flex-shrink: 0;
  transition: background var(--duration-fast) var(--ease-standard), border-color var(--duration-fast) var(--ease-standard);
}
.checkbox input:checked {
  background: var(--color-accent);
  border-color: var(--color-accent);
}
.checkbox input:checked::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 1px;
  width: 5px;
  height: 9px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

/* Radio */
.radio {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  font-size: var(--fs-sm);
  user-select: none;
}
.radio input {
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: var(--radius-full);
  border: 1.5px solid var(--color-border-strong);
  background: var(--color-bg-surface);
  position: relative;
  flex-shrink: 0;
  transition: border-color var(--duration-fast) var(--ease-standard);
}
.radio input:checked {
  border-color: var(--color-accent);
  border-width: 5px;
}

/* Radio / selectable option card (used in wizard) */
.option-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--color-border);
  background: var(--color-bg-surface);
  cursor: pointer;
  transition: border-color var(--duration-fast) var(--ease-standard), background var(--duration-fast) var(--ease-standard), transform var(--duration-fast) var(--ease-standard);
}
.option-card:hover { border-color: var(--color-border-strong); transform: translateY(-1px); }
.option-card.is-selected {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}
.option-card__icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--color-bg-sunken);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  flex-shrink: 0;
}
.option-card.is-selected .option-card__icon {
  background: var(--color-accent);
  color: #fff;
}
.option-card__title { font-weight: var(--fw-semibold); font-size: var(--fs-base); }
.option-card__desc { font-size: var(--fs-xs); color: var(--color-text-secondary); }

/* ---------------- Dropdown / menu ---------------- */
.dropdown {
  position: relative;
  display: inline-block;
}
.dropdown__menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 220px;
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2);
  z-index: var(--z-dropdown);
  opacity: 0;
  transform: translateY(-4px) scale(0.98);
  pointer-events: none;
  transition: opacity var(--duration-fast) var(--ease-standard), transform var(--duration-fast) var(--ease-standard);
}
.dropdown__menu.is-open {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}
.dropdown__item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
  color: var(--color-text-primary);
}
.dropdown__item:hover { background: var(--color-bg-hover); }
.dropdown__item svg { width: 16px; height: 16px; color: var(--color-text-secondary); }
.dropdown__divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-2) 0;
}

/* ---------------- Tables ---------------- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--fs-sm);
}
.table th {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-surface-2);
  color: var(--color-text-secondary);
  font-weight: var(--fw-medium);
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}
.table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-primary);
}
.table tbody tr:last-child td { border-bottom: none; }
.table tbody tr {
  transition: background var(--duration-fast) var(--ease-standard);
}
.table tbody tr:hover { background: var(--color-bg-hover); }

/* ---------------- Badges ---------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  white-space: nowrap;
}
.badge-success { background: var(--color-success-soft); color: var(--color-success); }
.badge-warning { background: var(--color-warning-soft); color: var(--color-warning); }
.badge-danger  { background: var(--color-danger-soft); color: var(--color-danger); }
.badge-info    { background: var(--color-info-soft); color: var(--color-info); }
.badge-neutral { background: var(--color-bg-sunken); color: var(--color-text-secondary); }

/* ---------------- Tabs ---------------- */
.tabs {
  display: flex;
  gap: var(--space-1);
  border-bottom: 1px solid var(--color-border);
}
.tab {
  padding: var(--space-3) var(--space-4);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color var(--duration-fast) var(--ease-standard), border-color var(--duration-fast) var(--ease-standard);
}
.tab:hover { color: var(--color-text-primary); }
.tab.is-active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* ---------------- Breadcrumbs ---------------- */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--fs-sm);
  color: var(--color-text-tertiary);
}
.breadcrumbs a:hover { color: var(--color-text-primary); }
.breadcrumbs .is-current { color: var(--color-text-primary); font-weight: var(--fw-medium); }

/* ---------------- Search ---------------- */
.search-box {
  position: relative;
  display: flex;
  align-items: center;
}
.search-box svg {
  position: absolute;
  left: var(--space-3);
  width: 16px;
  height: 16px;
  color: var(--color-text-tertiary);
}
.search-box input {
  width: 100%;
  height: 38px;
  padding: 0 var(--space-3) 0 calc(var(--space-3) * 2 + 16px);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-bg-sunken);
  font-size: var(--fs-sm);
}
.search-box input:focus {
  outline: none;
  border-color: var(--color-accent);
  background: var(--color-bg-surface);
}
.search-box kbd {
  position: absolute;
  right: var(--space-2);
  font-size: 10px;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-tertiary);
}

/* ---------------- Modal ---------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--color-bg-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-base) var(--ease-standard);
}
.modal-overlay.is-open {
  opacity: 1;
  pointer-events: auto;
}
.modal {
  width: 480px;
  max-width: calc(100vw - 40px);
  max-height: calc(100vh - 80px);
  background: var(--color-bg-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  display: flex;
  flex-direction: column;
  transform: translateY(12px) scale(0.98);
  transition: transform var(--duration-base) var(--ease-emphasized);
}
.modal-overlay.is-open .modal {
  transform: translateY(0) scale(1);
}
.modal__header {
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.modal__body {
  padding: var(--space-6);
  overflow-y: auto;
}
.modal__footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
}

/* ---------------- Toasts ---------------- */
.toast-region {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  z-index: var(--z-toast);
}
.toast {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  min-width: 320px;
  max-width: 380px;
  padding: var(--space-4);
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  animation: toastIn var(--duration-base) var(--ease-emphasized);
}
.toast.is-leaving {
  animation: toastOut var(--duration-base) var(--ease-standard) forwards;
}
@keyframes toastIn {
  from { opacity: 0; transform: translateX(24px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes toastOut {
  to { opacity: 0; transform: translateX(24px); }
}
.toast__icon {
  width: 20px; height: 20px; flex-shrink: 0; margin-top: 1px;
}
.toast-success .toast__icon { color: var(--color-success); }
.toast-danger .toast__icon { color: var(--color-danger); }
.toast-info .toast__icon { color: var(--color-info); }
.toast__title { font-size: var(--fs-sm); font-weight: var(--fw-semibold); }
.toast__desc { font-size: var(--fs-xs); color: var(--color-text-secondary); margin-top: 2px; }
.toast__close {
  margin-left: auto;
  color: var(--color-text-tertiary);
  flex-shrink: 0;
}

/* ---------------- Progress bar ---------------- */
.progress-track {
  width: 100%;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--color-bg-sunken);
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: var(--color-accent);
  border-radius: var(--radius-full);
  transition: width var(--duration-slow) var(--ease-emphasized);
}

/* ---------------- Loading / spinner ---------------- */
.spinner {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2.5px solid var(--color-border);
  border-top-color: var(--color-accent);
  animation: spin 0.7s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
.loading-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-8);
  color: var(--color-text-secondary);
  font-size: var(--fs-sm);
}

.skeleton {
  background: linear-gradient(90deg, var(--color-bg-sunken) 25%, var(--color-bg-hover) 37%, var(--color-bg-sunken) 63%);
  background-size: 400% 100%;
  animation: skeletonShimmer 1.4s ease infinite;
  border-radius: var(--radius-sm);
}
@keyframes skeletonShimmer {
  0% { background-position: 100% 50%; }
  100% { background-position: 0 50%; }
}

/* ---------------- Theme toggle ---------------- */
.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  background: transparent;
  border: none;
}
.theme-toggle:hover { background: var(--color-bg-hover); color: var(--color-text-primary); }
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }