/* ============================================
   UI Library — Configurable via CSS Custom Properties
   ============================================

   To customize, override any of these in your own stylesheet:

   For Shadow DOM components, use :host instead of :root:

   :host {
     --ui-primary:   #2095f3;
     --ui-secondary: #8590a2;
   }

   :root {
     --ui-primary:   #2095f3;
     --ui-secondary: #8590a2;
     --ui-success:   #34c379;
     --ui-danger:    #f06272;
     --ui-warning:   #f5a623;

     --ui-bg:        #ffffff;
     --ui-text:      #1a1d26;
     --ui-border:    #e8ecf1;

     --ui-radius:    6px;
     --ui-font:      system-ui, sans-serif;
   }

   Hover, active, and light variants are derived automatically
   via color-mix() — no need to set them manually.
   ============================================ */

/* Use :root for document-level themes, or :host inside a Shadow DOM component. */
:root {
  /* --- Color palette --- */
  --ui-primary: #2095f3;
  --ui-primary-hover: color-mix(in srgb, var(--ui-primary) 80%, #000);
  --ui-primary-active: color-mix(in srgb, var(--ui-primary) 65%, #000);
  --ui-primary-light: color-mix(in srgb, var(--ui-primary) 15%, #fff);
  --ui-primary-text: #ffffff;

  --ui-secondary: #8590a2;
  --ui-secondary-hover: color-mix(in srgb, var(--ui-secondary) 80%, #000);
  --ui-secondary-active: color-mix(in srgb, var(--ui-secondary) 65%, #000);
  --ui-secondary-light: color-mix(in srgb, var(--ui-secondary) 12%, #fff);
  --ui-secondary-text: #ffffff;

  --ui-success: #34c379;
  --ui-success-hover: color-mix(in srgb, var(--ui-success) 80%, #000);
  --ui-success-active: color-mix(in srgb, var(--ui-success) 65%, #000);
  --ui-success-light: color-mix(in srgb, var(--ui-success) 12%, #fff);
  --ui-success-text: #ffffff;

  --ui-danger: #f06272;
  --ui-danger-hover: color-mix(in srgb, var(--ui-danger) 80%, #000);
  --ui-danger-active: color-mix(in srgb, var(--ui-danger) 65%, #000);
  --ui-danger-light: color-mix(in srgb, var(--ui-danger) 12%, #fff);
  --ui-danger-text: #ffffff;

  --ui-warning: #f5a623;
  --ui-warning-hover: color-mix(in srgb, var(--ui-warning) 80%, #000);
  --ui-warning-active: color-mix(in srgb, var(--ui-warning) 65%, #000);
  --ui-warning-light: color-mix(in srgb, var(--ui-warning) 12%, #fff);
  --ui-warning-text: #1a1d26;

  /* --- Neutrals --- */
  --ui-bg: #ffffff;
  --ui-bg-subtle: #f7f8fb;
  --ui-surface: #ffffff;
  --ui-border: #e8ecf1;
  --ui-border-focus: var(--ui-primary);
  --ui-text: #1a1d26;
  --ui-text-muted: #8590a2;
  --ui-text-inverse: #ffffff;
  --ui-overlay: rgba(16, 20, 34, 0.4);

  /* --- Sizing / Radius / Shadows --- */
  --ui-radius-sm: 4px;
  --ui-radius: 6px;
  --ui-radius-lg: 10px;
  --ui-radius-full: 9999px;
  --ui-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --ui-shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --ui-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --ui-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

  /* --- Tooltip --- */
  --ui-tooltip-bg: #4b5563;
  --ui-tooltip-text: #fff;

  /* --- Typography --- */
  --ui-font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --ui-font-mono: ui-monospace, "Cascadia Code", "Fira Code", monospace;
  --ui-font-size: 0.875rem;
  --ui-line-height: 1.5;

  /* --- Transitions --- */
  --ui-transition: 150ms ease;
}

/* ============================================
   Dark mode
   ============================================ */

[data-theme="dark"] {
  --ui-primary: #4dabf7;
  --ui-primary-hover: color-mix(in srgb, var(--ui-primary) 80%, #fff);
  --ui-primary-active: color-mix(in srgb, var(--ui-primary) 65%, #fff);
  --ui-primary-light: color-mix(in srgb, var(--ui-primary) 15%, #000);
  --ui-primary-text: #ffffff;

  --ui-secondary: #8590a2;
  --ui-secondary-hover: color-mix(in srgb, var(--ui-secondary) 80%, #fff);
  --ui-secondary-active: color-mix(in srgb, var(--ui-secondary) 65%, #fff);
  --ui-secondary-light: color-mix(in srgb, var(--ui-secondary) 12%, #000);
  --ui-secondary-text: #ffffff;

  --ui-success: #51cf96;
  --ui-success-hover: color-mix(in srgb, var(--ui-success) 80%, #fff);
  --ui-success-active: color-mix(in srgb, var(--ui-success) 65%, #fff);
  --ui-success-light: color-mix(in srgb, var(--ui-success) 12%, #000);
  --ui-success-text: #ffffff;

  --ui-danger: #ff7b8a;
  --ui-danger-hover: color-mix(in srgb, var(--ui-danger) 80%, #fff);
  --ui-danger-active: color-mix(in srgb, var(--ui-danger) 65%, #fff);
  --ui-danger-light: color-mix(in srgb, var(--ui-danger) 12%, #000);
  --ui-danger-text: #ffffff;

  --ui-warning: #ffc048;
  --ui-warning-hover: color-mix(in srgb, var(--ui-warning) 80%, #fff);
  --ui-warning-active: color-mix(in srgb, var(--ui-warning) 65%, #fff);
  --ui-warning-light: color-mix(in srgb, var(--ui-warning) 12%, #000);
  --ui-warning-text: #1a1d26;

  --ui-bg: #1a1d26;
  --ui-bg-subtle: #12141a;
  --ui-surface: #22252e;
  --ui-border: #333842;
  --ui-border-focus: var(--ui-primary);
  --ui-text: #e4e6eb;
  --ui-text-muted: #8590a2;
  --ui-text-inverse: #1a1d26;
  --ui-overlay: rgba(0, 0, 0, 0.6);

  --ui-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --ui-shadow: 0 1px 3px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);
  --ui-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
  --ui-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.4);

  --ui-tooltip-bg: #e4e6eb;
  --ui-tooltip-text: #1a1d26;
}

/* ============================================
   Base reset for library elements
   ============================================ */

.ui-btn,
.ui-input,
.ui-select,
.ui-textarea {
  font-family: var(--ui-font);
  font-size: var(--ui-font-size);
  line-height: var(--ui-line-height);
  box-sizing: border-box;
}

/* ============================================
   Buttons
   ============================================ */

.ui-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 0.5rem 1rem;
  border: 1px solid transparent;
  border-radius: var(--ui-radius);
  font-weight: 500;
  cursor: pointer;
  transition: background var(--ui-transition), border-color var(--ui-transition),
    box-shadow var(--ui-transition), opacity var(--ui-transition);
  user-select: none;
  white-space: nowrap;
  text-decoration: none;

  /* Default: primary solid */
  background: var(--ui-primary);
  color: var(--ui-primary-text);

  &:hover {
    background: var(--ui-primary-hover);
  }

  &:active {
    background: var(--ui-primary-active);
  }

  &:focus-visible {
    outline: 2px solid var(--ui-primary);
    outline-offset: 2px;
  }

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

  /* --- Variants --- */

  &.secondary {
    background: var(--ui-secondary);
    color: var(--ui-secondary-text);

    &:hover {
      background: var(--ui-secondary-hover);
    }

    &:active {
      background: var(--ui-secondary-active);
    }

    &:focus-visible {
      outline-color: var(--ui-secondary);
    }
  }

  &.success {
    background: var(--ui-success);
    color: var(--ui-success-text);

    &:hover {
      background: var(--ui-success-hover);
    }

    &:active {
      background: var(--ui-success-active);
    }

    &:focus-visible {
      outline-color: var(--ui-success);
    }
  }

  &.danger {
    background: var(--ui-danger);
    color: var(--ui-danger-text);

    &:hover {
      background: var(--ui-danger-hover);
    }

    &:active {
      background: var(--ui-danger-active);
    }

    &:focus-visible {
      outline-color: var(--ui-danger);
    }
  }

  &.warning {
    background: var(--ui-warning);
    color: var(--ui-warning-text);

    &:hover {
      background: var(--ui-warning-hover);
    }

    &:active {
      background: var(--ui-warning-active);
    }

    &:focus-visible {
      outline-color: var(--ui-warning);
    }
  }

  /* --- Outline style --- */

  &.outline {
    background: transparent;
    border-color: var(--ui-primary);
    color: var(--ui-primary);

    &:hover {
      background: color-mix(in srgb, var(--ui-primary) 8%, transparent);
    }

    &:active {
      background: color-mix(in srgb, var(--ui-primary) 15%, transparent);
    }

    &.secondary {
      border-color: var(--ui-secondary);
      color: var(--ui-secondary);

      &:hover {
        background: var(--ui-secondary-light);
      }

      &:active {
        background: color-mix(in srgb, var(--ui-secondary) 20%, transparent);
      }
    }

    &.danger {
      border-color: var(--ui-danger);
      color: var(--ui-danger);

      &:hover {
        background: var(--ui-danger-light);
      }

      &:active {
        background: color-mix(in srgb, var(--ui-danger) 20%, transparent);
      }
    }

    &.success {
      border-color: var(--ui-success);
      color: var(--ui-success);

      &:hover {
        background: var(--ui-success-light);
      }

      &:active {
        background: color-mix(in srgb, var(--ui-success) 20%, transparent);
      }
    }
  }

  /* --- Ghost style --- */

  &.ghost {
    background: transparent;
    color: var(--ui-primary);

    &:hover {
      background: var(--ui-primary-light);
    }

    &:active {
      background: color-mix(in srgb, var(--ui-primary) 25%, transparent);
    }

    &.secondary {
      color: var(--ui-secondary);

      &:hover {
        background: var(--ui-secondary-light);
      }

      &:active {
        background: color-mix(in srgb, var(--ui-secondary) 30%, transparent);
      }
    }

    &.danger {
      color: var(--ui-danger);

      &:hover {
        background: var(--ui-danger-light);
      }

      &:active {
        background: color-mix(in srgb, var(--ui-danger) 30%, transparent);
      }
    }
  }

  /* --- Sizes --- */

  &.sm {
    padding: 0.25rem 0.75rem;
    font-size: 0.8125rem;
    border-radius: var(--ui-radius-sm);
  }

  &.lg {
    padding: 0.625rem 1.5rem;
    font-size: 1rem;
    border-radius: var(--ui-radius);
  }

  /* --- Pill shape --- */

  &.pill {
    border-radius: var(--ui-radius-full);
  }

  /* --- Full width --- */

  &.block {
    width: 100%;
  }

  /* --- Icon-only --- */

  &.icon {
    line-height: 1;
    padding: 0.71875rem;
    aspect-ratio: 1;

    &.sm { padding: 0.453125rem; }
    &.lg { padding: 0.875rem; }
  }

  /* --- Icons inside buttons --- */
  &.sm .bi {
    font-size: 0.875em;
  }

  &.lg .bi {
    font-size: 1em;
  }

  /* --- Loading state --- */

  &.loading {
    pointer-events: none;
    opacity: 0.65;

    &::after {
      content: "";
      width: 0.875em;
      height: 0.875em;
      background: conic-gradient(transparent 90deg, currentColor 90deg);
      mask: radial-gradient(farthest-side, transparent calc(100% - 2px), #000 calc(100% - 2px));
      -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 2px), #000 calc(100% - 2px));
      border-radius: 50%;
      animation: ui-spin 0.6s linear infinite;
      flex-shrink: 0;
    }
  }
}

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

/* ============================================
   Button group
   ============================================ */

.ui-btn-group {
  display: inline-flex;

  & > .ui-btn {
    border-radius: 0;

    &:first-child {
      border-radius: var(--ui-radius) 0 0 var(--ui-radius);
    }

    &:last-child {
      border-radius: 0 var(--ui-radius) var(--ui-radius) 0;
    }

    & + .ui-btn {
      margin-left: -1px;
    }
  }
}

/* ============================================
   Toggle button
   ============================================ */

.ui-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  user-select: none;
  font-family: var(--ui-font);
  font-size: var(--ui-font-size);

  & input[type="checkbox"] {
    display: none;
  }

  & .ui-toggle-track {
    position: relative;
    width: 2.5rem;
    height: 1.375rem;
    background: var(--ui-border);
    border-radius: var(--ui-radius-full);
    transition: background var(--ui-transition);
    flex-shrink: 0;

    &::after {
      content: "";
      position: absolute;
      top: 0.1875rem;
      left: 0.1875rem;
      width: 1rem;
      height: 1rem;
      background: #fff;
      border-radius: 50%;
      box-shadow: var(--ui-shadow-sm);
      transition: transform var(--ui-transition), background var(--ui-transition);
    }
  }

  & input:checked + .ui-toggle-track {
    background: var(--ui-primary);

    &::after {
      transform: translateX(1.125rem);
    }
  }

  &:hover .ui-toggle-track {
    filter: brightness(0.95);
  }

  /* Variants */
  &.success input:checked + .ui-toggle-track { background: var(--ui-success); }
  &.danger  input:checked + .ui-toggle-track { background: var(--ui-danger); }
  &.warning input:checked + .ui-toggle-track { background: var(--ui-warning); }

  /* Sizes */
  &.sm {
    font-size: 0.8125rem;

    & .ui-toggle-track {
      width: 1.875rem;
      height: 1.0625rem;

      &::after {
        width: 0.6875rem;
        height: 0.6875rem;
        top: 0.1875rem;
        left: 0.1875rem;
      }
    }

    & input:checked + .ui-toggle-track::after {
      transform: translateX(0.8125rem);
    }
  }

  &.lg {
    font-size: 1rem;

    & .ui-toggle-track {
      width: 3.25rem;
      height: 1.75rem;

      &::after {
        width: 1.25rem;
        height: 1.25rem;
        top: 0.25rem;
        left: 0.25rem;
      }
    }

    & input:checked + .ui-toggle-track::after {
      transform: translateX(1.5rem);
    }
  }

  /* Disabled */
  &:has(input:disabled) {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
  }
}

/* ============================================
   Inputs
   ============================================ */

.ui-input,
.ui-select,
.ui-textarea {
  display: block;
  width: 100%;
  padding: 0.5rem 0.75rem;
  background: var(--ui-bg);
  border: 1px solid var(--ui-border);
  border-radius: var(--ui-radius);
  color: var(--ui-text);
  transition: border-color var(--ui-transition);

  &::placeholder {
    color: var(--ui-text-muted);
  }

  &:hover {
    border-color: var(--ui-secondary);
  }

  &:focus {
    outline: none;
    border-color: var(--ui-border-focus);
  }

  &:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: var(--ui-bg-subtle);
  }

  &.error {
    border-color: var(--ui-danger);
  }

  &.sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.8125rem;
  }

  &.lg {
    padding: 0.625rem 1rem;
    font-size: 1rem;
  }
}

.ui-textarea {
  min-height: 5rem;
  resize: vertical;
}

.ui-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 12 12'%3E%3Cpath fill='%2364748b' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2.25rem;
}

/* --- Form field wrapper --- */

.ui-field {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;

  & > label,
  & > .ui-label {
    font-family: var(--ui-font);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--ui-text);
  }

  & > .ui-hint {
    font-size: 0.75rem;
    color: var(--ui-text-muted);
  }

  & > .ui-error-text {
    font-size: 0.75rem;
    color: var(--ui-danger);
  }
}

/* --- Checkbox / Radio --- */

.ui-checkbox,
.ui-radio {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--ui-font);
  font-size: var(--ui-font-size);
  cursor: pointer;
  user-select: none;

  & input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
    pointer-events: none;
  }

  & .ui-check-box {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.125rem;
    height: 1.125rem;
    border: 1.5px solid var(--ui-border);
    border-radius: var(--ui-radius-sm);
    background: var(--ui-bg);
    flex-shrink: 0;
    transition: background var(--ui-transition), border-color var(--ui-transition);

    /* Checkmark */
    &::after {
      content: "";
      position: absolute;
      top: 50%;
      left: 50%;
      width: 0.3125rem;
      height: 0.5625rem;
      border: solid transparent;
      border-width: 0 2px 2px 0;
      transform: translate(-50%, -60%) rotate(45deg) scale(0);
      transition: transform 100ms ease, border-color 100ms ease;
    }
  }

  & input:checked + .ui-check-box {
    background: var(--ui-primary);
    border-color: var(--ui-primary);

    &::after {
      border-color: #fff;
      transform: translate(-50%, -60%) rotate(45deg) scale(1);
    }
  }

  & input:focus-visible + .ui-check-box {
    outline: 2px solid var(--ui-primary);
    outline-offset: 2px;
  }

  &:hover .ui-check-box {
    border-color: var(--ui-primary);
  }

  /* Indeterminate */
  & input:indeterminate + .ui-check-box {
    background: var(--ui-primary);
    border-color: var(--ui-primary);

    &::after {
      width: 0.5rem;
      height: 0;
      border-width: 0 0 2px 0;
      border-color: #fff;
      transform: translate(-50%, -50%) scale(1);
    }
  }

  /* Disabled */
  &:has(input:disabled) {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
  }

  /* Color variants */
  &.success {
    & input:checked + .ui-check-box { background: var(--ui-success); border-color: var(--ui-success); }
    &:hover .ui-check-box { border-color: var(--ui-success); }
  }
  &.danger {
    & input:checked + .ui-check-box { background: var(--ui-danger); border-color: var(--ui-danger); }
    &:hover .ui-check-box { border-color: var(--ui-danger); }
  }
  &.warning {
    & input:checked + .ui-check-box { background: var(--ui-warning); border-color: var(--ui-warning); }
    &:hover .ui-check-box { border-color: var(--ui-warning); }
  }

  /* Sizes */
  &.sm {
    font-size: 0.8125rem;

    & .ui-check-box {
      width: 0.9375rem;
      height: 0.9375rem;

      &::after {
        width: 0.25rem;
        height: 0.4375rem;
        border-width: 0 1.75px 1.75px 0;
      }
    }
  }

  &.lg {
    font-size: 1rem;

    & .ui-check-box {
      width: 1.375rem;
      height: 1.375rem;
      border-width: 2px;

      &::after {
        width: 0.375rem;
        height: 0.6875rem;
        border-width: 0 2.5px 2.5px 0;
      }
    }
  }
}

/* Radio: round shape, dot instead of checkmark */
.ui-radio {
  & .ui-check-box {
    border-radius: 50%;
    box-sizing: border-box;
    border-width: 2px;
  }

  &.sm .ui-check-box,
  &.lg .ui-check-box {
    border-width: 2px;
  }

  & .ui-check-box::after,
  &.sm .ui-check-box::after,
  &.lg .ui-check-box::after {
    position: static;
    border: none;
    border-radius: 50%;
    background: transparent;
    transform: scale(0);
  }

  & .ui-check-box::after { width: 0.5rem; height: 0.5rem; }
  &.sm .ui-check-box::after { width: 0.3125rem; height: 0.3125rem; }
  &.lg .ui-check-box::after { width: 0.625rem; height: 0.625rem; }

  & input:checked + .ui-check-box {
    background: var(--ui-primary);
    border-color: var(--ui-primary);

    &::after {
      background: #fff;
      transform: scale(1);
    }
  }
}

/* Legacy fallback */
.ui-check {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--ui-font);
  font-size: var(--ui-font-size);
  cursor: pointer;

  & input[type="checkbox"],
  & input[type="radio"] {
    width: 1rem;
    height: 1rem;
    accent-color: var(--ui-primary);
    cursor: pointer;
  }
}

/* ============================================
   Dropdown
   ============================================ */

.ui-dropdown {
  position: relative;
  display: inline-block;

  & .ui-dropdown-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.5em;
    padding: 0.5rem 0.75rem;
    font-family: var(--ui-font);
    font-size: var(--ui-font-size);
    font-weight: 500;
    color: var(--ui-text);
    background: var(--ui-surface);
    border: 1px solid var(--ui-border);
    border-radius: var(--ui-radius);
    cursor: pointer;
    white-space: nowrap;
    transition: border-color var(--ui-transition);

    &:hover {
      border-color: var(--ui-text-muted);
    }

    &:focus-visible {
      outline: 2px solid var(--ui-primary);
      outline-offset: 2px;
    }

    &::after {
      content: "";
      width: 0.375em;
      height: 0.375em;
      border-right: 2px solid currentColor;
      border-bottom: 2px solid currentColor;
      transform: rotate(45deg);
      margin-top: -0.125em;
      opacity: 0.6;
      transition: transform var(--ui-transition);
    }
  }

  & .ui-dropdown-menu {
    position: absolute;
    top: calc(100% + 0.25rem);
    left: 0;
    min-width: 100%;
    max-height: 20rem;
    overflow-y: auto;
    background: var(--ui-surface);
    border: 1px solid var(--ui-border);
    border-radius: var(--ui-radius);
    box-shadow: var(--ui-shadow-lg);
    padding: 0.25rem;
    z-index: 100;
    display: none;
    opacity: 0;
    transform: translateY(-0.25rem);
    transition: opacity var(--ui-transition), transform var(--ui-transition);
  }

  &.open {
    & .ui-dropdown-toggle::after {
      transform: rotate(-135deg);
      margin-top: 0.125em;
    }

    & .ui-dropdown-menu {
      display: block;
      opacity: 1;
      transform: translateY(0);
    }
  }

  &.right .ui-dropdown-menu {
    left: auto;
    right: 0;
  }

  &.sm {
    & .ui-dropdown-toggle {
      padding: 0.25rem 0.5rem;
      font-size: 0.8125rem;
    }

    & .ui-dropdown-item {
      padding: 0.3125rem 0.5rem;
      font-size: 0.8125rem;
    }
  }

  &.lg {
    & .ui-dropdown-toggle {
      padding: 0.625rem 1rem;
      font-size: 1rem;
    }

    & .ui-dropdown-item {
      padding: 0.5625rem 0.75rem;
      font-size: 1rem;
    }
  }
}

.ui-dropdown-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.4375rem 0.625rem;
  font-family: var(--ui-font);
  font-size: var(--ui-font-size);
  color: var(--ui-text);
  background: none;
  border: none;
  border-radius: var(--ui-radius-sm);
  cursor: pointer;
  text-align: left;
  white-space: nowrap;
  transition: background var(--ui-transition);

  &:hover,
  &.focused {
    background: var(--ui-bg-subtle);
  }

  &.active {
    color: var(--ui-primary);
    font-weight: 500;
  }

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

.ui-dropdown-divider {
  height: 0;
  border: none;
  border-top: 1px solid var(--ui-border);
  margin: 0.25rem 0;
}

.ui-dropdown-label {
  display: block;
  padding: 0.375rem 0.625rem 0.25rem;
  font-family: var(--ui-font);
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--ui-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ============================================
   Autocomplete / Search dropdown
   ============================================ */

.ui-autocomplete {
  position: relative;

  & .ui-autocomplete-input {
    width: 100%;
    padding: 0.5rem 0.75rem 0.5rem 2rem;
    font-family: var(--ui-font);
    font-size: var(--ui-font-size);
    line-height: var(--ui-line-height);
    color: var(--ui-text);
    background: var(--ui-surface);
    border: 1px solid var(--ui-border);
    border-radius: var(--ui-radius);
    outline: none;
    box-sizing: border-box;
    transition: border-color var(--ui-transition);

    &:focus {
      border-color: var(--ui-primary);
    }

    &::placeholder {
      color: var(--ui-text-muted);
    }
  }

  & .ui-autocomplete-icon {
    position: absolute;
    left: 0.625rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--ui-text-muted);
    font-size: 0.875rem;
    pointer-events: none;
  }

  & .ui-autocomplete-menu {
    position: absolute;
    top: calc(100% + 0.25rem);
    left: 0;
    width: 100%;
    max-height: 16rem;
    overflow-y: auto;
    background: var(--ui-surface);
    border: 1px solid var(--ui-border);
    border-radius: var(--ui-radius);
    box-shadow: var(--ui-shadow-lg);
    padding: 0.25rem;
    z-index: 100;
    display: none;
  }

  &.open .ui-autocomplete-menu {
    display: block;
  }

  &.sm {
    & .ui-autocomplete-input {
      padding: 0.25rem 0.625rem 0.25rem 1.75rem;
      font-size: 0.8125rem;
    }

    & .ui-autocomplete-icon {
      font-size: 0.75rem;
    }

    & .ui-dropdown-item {
      padding: 0.3125rem 0.5rem;
      font-size: 0.8125rem;
    }
  }

  &.lg {
    & .ui-autocomplete-input {
      padding: 0.625rem 1rem 0.625rem 2.25rem;
      font-size: 1rem;
    }

    & .ui-autocomplete-icon {
      font-size: 1rem;
    }

    & .ui-dropdown-item {
      padding: 0.5625rem 0.75rem;
      font-size: 1rem;
    }
  }
}

.ui-autocomplete-menu .ui-dropdown-item.hidden {
  display: none;
}

.ui-autocomplete-empty {
  padding: 0.75rem 0.625rem;
  font-family: var(--ui-font);
  font-size: var(--ui-font-size);
  color: var(--ui-text-muted);
  text-align: center;
  display: none;
}

/* ============================================
   Panels / Cards
   ============================================ */

.ui-panel {
  background: var(--ui-surface);
  border: 1px solid var(--ui-border);
  border-radius: var(--ui-radius-lg);
  box-shadow: var(--ui-shadow-sm);
  overflow: hidden;

  & > .ui-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--ui-border);
    font-family: var(--ui-font);

    & > .ui-panel-title {
      font-size: 1rem;
      font-weight: 600;
      color: var(--ui-text);
      margin: 0;
    }

    & > .ui-panel-actions {
      display: flex;
      gap: 0.5rem;
    }
  }

  & > .ui-panel-body {
    padding: 1.25rem;
    font-family: var(--ui-font);
    font-size: var(--ui-font-size);
    color: var(--ui-text);
    line-height: var(--ui-line-height);
  }

  & > .ui-panel-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    border-top: 1px solid var(--ui-border);
    background: var(--ui-bg-subtle);
  }

  /* --- Variants --- */

  &.flat {
    box-shadow: none;
  }

  &.raised {
    box-shadow: var(--ui-shadow-lg);
  }

  &.borderless {
    border: none;
    box-shadow: var(--ui-shadow);
  }
}

/* ============================================
   Dialog / Modal
   ============================================ */

.ui-dialog {
  background: var(--ui-surface);
  border-radius: var(--ui-radius-lg);
  box-shadow: var(--ui-shadow-xl);
  width: min(28rem, calc(100vw - 2rem));
  max-height: calc(100vh - 4rem);

  & > .ui-dialog-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--ui-border);

    & > .ui-dialog-title {
      font-family: var(--ui-font);
      font-size: 1.125rem;
      font-weight: 600;
      color: var(--ui-text);
      margin: 0;
    }

    & > .ui-dialog-close {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 2rem;
      height: 2rem;
      background: none;
      border: none;
      border-radius: var(--ui-radius);
      color: var(--ui-text-muted);
      cursor: pointer;
      font-size: 1.25rem;
      transition: background var(--ui-transition), color var(--ui-transition);

      &:hover {
        background: var(--ui-bg-subtle);
        color: var(--ui-text);
      }
    }
  }

  & > .ui-dialog-body {
    padding: 1.25rem;
    overflow-y: auto;
    font-family: var(--ui-font);
    font-size: var(--ui-font-size);
    color: var(--ui-text);
    line-height: var(--ui-line-height);
  }

  & > .ui-dialog-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    border-top: 1px solid var(--ui-border);
  }

  &.sm {
    width: min(20rem, calc(100vw - 2rem));
  }

  &.lg {
    width: min(40rem, calc(100vw - 2rem));
  }

  &.full {
    width: calc(100vw - 2rem);
    height: calc(100vh - 4rem);
  }
}

.ui-dialog-backdrop {
  position: fixed;
  inset: 0;
  background: var(--ui-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--ui-transition), visibility var(--ui-transition);

  &.open {
    opacity: 1;
    visibility: visible;
  }

  & > .ui-dialog {
    display: flex;
    flex-direction: column;
    transform: translateY(8px) scale(0.98);
    transition: transform var(--ui-transition);

    .open > & {
      transform: translateY(0) scale(1);
    }
  }
}

/* Native <dialog> support */

dialog.ui-dialog {
  border: none;
  padding: 0;

  &[open] {
    display: flex;
    flex-direction: column;
  }

  &::backdrop {
    background: var(--ui-overlay);
  }
}

/* ============================================
   Badges / Tags
   ============================================ */

.ui-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25em;
  padding: 0.125rem 0.5rem;
  font-family: var(--ui-font);
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: var(--ui-radius-full);
  background: var(--ui-primary-light);
  color: var(--ui-primary);

  &.secondary {
    background: var(--ui-secondary-light);
    color: var(--ui-secondary);
  }

  &.success {
    background: var(--ui-success-light);
    color: var(--ui-success);
  }

  &.danger {
    background: var(--ui-danger-light);
    color: var(--ui-danger);
  }

  &.warning {
    background: var(--ui-warning-light);
    color: var(--ui-warning);
  }

  /* --- Solid style --- */

  &.solid {
    background: var(--ui-primary);
    color: var(--ui-primary-text);

    &.secondary { background: var(--ui-secondary); color: var(--ui-secondary-text); }
    &.success   { background: var(--ui-success); color: var(--ui-success-text); }
    &.danger    { background: var(--ui-danger); color: var(--ui-danger-text); }
    &.warning   { background: var(--ui-warning); color: var(--ui-warning-text); }
  }

  /* --- Outline style --- */

  &.outline {
    background: transparent;
    border: 1px solid var(--ui-primary);
    color: var(--ui-primary);

    &.secondary { border-color: var(--ui-secondary); color: var(--ui-secondary); }
    &.success   { border-color: var(--ui-success); color: var(--ui-success); }
    &.danger    { border-color: var(--ui-danger); color: var(--ui-danger); }
    &.warning   { border-color: var(--ui-warning); color: var(--ui-warning); }
  }

  /* --- Sizes --- */

  &.sm {
    font-size: 0.6875rem;
    padding: 0.0625rem 0.375rem;
  }

  &.lg {
    font-size: 0.875rem;
    padding: 0.25rem 0.625rem;
  }

  /* --- Dot indicator --- */

  &.dot::before {
    content: "";
    width: 0.375rem;
    height: 0.375rem;
    border-radius: 50%;
    background: currentColor;
    flex-shrink: 0;
  }
}

/* ============================================
   Tags (dismissible)
   ============================================ */

.ui-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.25em;
  padding: 0.1875rem 0.5rem;
  font-family: var(--ui-font);
  font-size: 0.8125rem;
  font-weight: 500;
  border-radius: var(--ui-radius);
  background: var(--ui-bg-subtle);
  color: var(--ui-text);
  border: 1px solid var(--ui-border);

  & .ui-tag-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1rem;
    height: 1rem;
    margin-left: 0.125rem;
    margin-right: -0.1875rem;
    border: none;
    background: none;
    color: var(--ui-text-muted);
    font-size: 0.875rem;
    line-height: 1;
    cursor: pointer;
    border-radius: var(--ui-radius-sm);
    padding: 0;
    transition: background var(--ui-transition), color var(--ui-transition);

    &:hover {
      background: var(--ui-border);
      color: var(--ui-text);
    }
  }

  /* Color variants */
  &.primary {
    background: var(--ui-primary-light);
    border-color: color-mix(in srgb, var(--ui-primary) 25%, transparent);
    color: var(--ui-primary);

    & .ui-tag-close:hover { background: color-mix(in srgb, var(--ui-primary) 20%, transparent); }
  }

  &.success {
    background: var(--ui-success-light);
    border-color: color-mix(in srgb, var(--ui-success) 25%, transparent);
    color: var(--ui-success);

    & .ui-tag-close:hover { background: color-mix(in srgb, var(--ui-success) 20%, transparent); }
  }

  &.danger {
    background: var(--ui-danger-light);
    border-color: color-mix(in srgb, var(--ui-danger) 25%, transparent);
    color: var(--ui-danger);

    & .ui-tag-close:hover { background: color-mix(in srgb, var(--ui-danger) 20%, transparent); }
  }

  &.warning {
    background: var(--ui-warning-light);
    border-color: color-mix(in srgb, var(--ui-warning) 25%, transparent);
    color: var(--ui-warning);

    & .ui-tag-close:hover { background: color-mix(in srgb, var(--ui-warning) 20%, transparent); }
  }

  /* Sizes */
  &.sm {
    font-size: 0.75rem;
    padding: 0.0625rem 0.375rem;
  }

  &.lg {
    font-size: 0.875rem;
    padding: 0.25rem 0.625rem;
  }
}

/* ============================================
   Tabs
   ============================================ */

.ui-tabs {
  display: flex;
  flex-direction: column;
  font-family: var(--ui-font);
}

.ui-tab-list {
  display: flex;
  border-bottom: 1px solid var(--ui-border);
  gap: 0;
  overflow-x: auto;

  /* Pill variant */
  &.pills {
    border-bottom: none;
    gap: 0.25rem;
    background: var(--ui-bg-subtle);
    padding: 0.25rem;
    border-radius: var(--ui-radius);

    & .ui-tab {
      border-bottom: none;
      border-radius: var(--ui-radius-sm);
      margin-bottom: 0;

      &.active {
        background: var(--ui-surface);
        color: var(--ui-text);
        box-shadow: var(--ui-shadow-sm);
      }

      &:hover:not(.active) {
        background: color-mix(in srgb, var(--ui-border) 50%, transparent);
      }
    }
  }

  /* Boxed variant */
  &.boxed {
    gap: 0;

    & .ui-tab {
      border: 1px solid transparent;
      border-bottom: 1px solid var(--ui-border);
      margin-bottom: -1px;
      border-radius: var(--ui-radius) var(--ui-radius) 0 0;

      &.active {
        border-color: var(--ui-border);
        border-bottom-color: var(--ui-surface);
        background: var(--ui-surface);
        color: var(--ui-text);
      }
    }
  }
}

.ui-tab {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.625rem 1rem;
  font-size: var(--ui-font-size);
  font-weight: 500;
  color: var(--ui-text-muted);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  cursor: pointer;
  white-space: nowrap;
  transition: color var(--ui-transition), border-color var(--ui-transition), background var(--ui-transition);

  &:hover {
    color: var(--ui-text);
  }

  &.active {
    color: var(--ui-primary);
    border-bottom-color: var(--ui-primary);
  }

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

  /* Sizes */
  &.sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
  }

  &.lg {
    padding: 0.75rem 1.25rem;
    font-size: 1rem;
  }
}

.ui-tab-panel {
  display: none;
  padding: 1rem 0;
  font-size: var(--ui-font-size);
  color: var(--ui-text);
  line-height: var(--ui-line-height);

  &.active {
    display: block;
  }
}

/* ============================================
   Alerts
   ============================================ */

.ui-alert {
  display: flex;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  border-radius: var(--ui-radius);
  font-family: var(--ui-font);
  font-size: var(--ui-font-size);
  line-height: var(--ui-line-height);
  background: var(--ui-primary-light);
  color: var(--ui-primary-active, var(--ui-primary));
  border: 1px solid var(--ui-primary);

  &.success {
    background: var(--ui-success-light);
    color: var(--ui-success);
    border-color: var(--ui-success);
  }

  &.danger {
    background: var(--ui-danger-light);
    color: var(--ui-danger);
    border-color: var(--ui-danger);
  }

  &.warning {
    background: var(--ui-warning-light);
    color: var(--ui-warning);
    border-color: var(--ui-warning);
  }

  &.secondary {
    background: var(--ui-secondary-light);
    color: var(--ui-secondary);
    border-color: var(--ui-secondary);
  }
}

/* ============================================
   Utility: spacing helpers
   ============================================ */

.ui-stack {
  display: flex;
  flex-direction: column;
  gap: 1rem;

  &.sm { gap: 0.5rem; }
  &.lg { gap: 1.5rem; }
}

.ui-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;

  &.sm { gap: 0.5rem; }
  &.lg { gap: 1.5rem; }
}

.ui-divider {
  border: none;
  border-top: 1px solid var(--ui-border);
  margin: 1rem 0;
}

/* ============================================
   Status dots
   ============================================ */

.ui-dot {
  display: inline-block;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--ui-secondary);
  flex-shrink: 0;
  vertical-align: middle;

  &.primary   { background: var(--ui-primary); }
  &.success   { background: var(--ui-success); }
  &.danger    { background: var(--ui-danger); }
  &.warning   { background: var(--ui-warning); }

  /* Pulse animation */
  &.pulse {
    animation: ui-pulse 1.5s ease-in-out infinite;
  }

  /* Sizes */
  &.sm {
    width: 0.375rem;
    height: 0.375rem;
  }

  &.lg {
    width: 0.75rem;
    height: 0.75rem;
  }
}

@keyframes ui-pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.4; }
}

/* ============================================
   Pagination
   ============================================ */

.ui-pagination {
  display: inline-flex;
  align-items: center;
  gap: 0.125rem;
  font-family: var(--ui-font);
  font-size: var(--ui-font-size);
}

.ui-page {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2rem;
  height: 2rem;
  padding: 0 0.5rem;
  border: 1px solid transparent;
  border-radius: var(--ui-radius);
  background: none;
  color: var(--ui-text);
  font-family: var(--ui-font);
  font-size: var(--ui-font-size);
  font-weight: 500;
  cursor: pointer;
  transition: background var(--ui-transition), border-color var(--ui-transition), color var(--ui-transition);
  user-select: none;
  text-decoration: none;

  &:hover {
    background: var(--ui-bg-subtle);
  }

  &.active {
    background: var(--ui-primary);
    color: var(--ui-primary-text);
  }

  &:focus-visible {
    outline: 2px solid var(--ui-primary);
    outline-offset: 2px;
    position: relative;
    z-index: 1;
  }

  &:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
  }

  &.ellipsis {
    pointer-events: none;
    min-width: 1.5rem;
    padding: 0;
  }
}

/* Color variants */
.ui-pagination.success .ui-page.active { background: var(--ui-success); color: var(--ui-success-text); }
.ui-pagination.danger  .ui-page.active { background: var(--ui-danger); color: var(--ui-danger-text); }
.ui-pagination.secondary .ui-page.active { background: var(--ui-secondary); color: var(--ui-secondary-text); }

/* Outlined variant */
.ui-pagination.outline .ui-page {
  border-color: var(--ui-border);

  &.active {
    border-color: var(--ui-primary);
    background: var(--ui-primary);
    color: var(--ui-primary-text);
  }
}

.ui-pagination.outline.success .ui-page.active { border-color: var(--ui-success); background: var(--ui-success); color: var(--ui-success-text); }
.ui-pagination.outline.danger  .ui-page.active { border-color: var(--ui-danger); background: var(--ui-danger); color: var(--ui-danger-text); }
.ui-pagination.outline.secondary .ui-page.active { border-color: var(--ui-secondary); background: var(--ui-secondary); color: var(--ui-secondary-text); }

/* Sizes */
.ui-pagination.sm .ui-page {
  min-width: 1.625rem;
  height: 1.625rem;
  font-size: 0.8125rem;
  padding: 0 0.375rem;
}

.ui-pagination.lg .ui-page {
  min-width: 2.5rem;
  height: 2.5rem;
  font-size: 1rem;
  padding: 0 0.625rem;
}

/* ============================================
   Tooltip
   ============================================ */

.ui-tooltip {
  position: relative;

  &::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 0.375rem);
    left: 50%;
    transform: translateX(-50%) translateY(4px);
    padding: 0.3125rem 0.5rem;
    font-family: var(--ui-font);
    font-size: 0.75rem;
    font-weight: 500;
    line-height: 1.4;
    white-space: nowrap;
    color: var(--ui-tooltip-text);
    background: var(--ui-tooltip-bg);
    border-radius: var(--ui-radius-sm);
    box-shadow: var(--ui-shadow);
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--ui-transition), transform var(--ui-transition);
    z-index: 200;
  }

  &:hover::after,
  &:focus-visible::after {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }

  /* Positions */
  &.bottom::after {
    bottom: auto;
    top: calc(100% + 0.375rem);
    transform: translateX(-50%) translateY(-4px);
  }

  &.bottom:hover::after,
  &.bottom:focus-visible::after {
    transform: translateX(-50%) translateY(0);
  }

  &.left::after {
    bottom: auto;
    top: 50%;
    left: auto;
    right: calc(100% + 0.375rem);
    transform: translateY(-50%) translateX(4px);
  }

  &.left:hover::after,
  &.left:focus-visible::after {
    transform: translateY(-50%) translateX(0);
  }

  &.right::after {
    bottom: auto;
    top: 50%;
    left: calc(100% + 0.375rem);
    transform: translateY(-50%) translateX(-4px);
  }

  &.right:hover::after,
  &.right:focus-visible::after {
    transform: translateY(-50%) translateX(0);
  }
}

/* ============================================
   Numbered badge (corner badge)
   ============================================ */

.ui-badge-corner {
  position: relative;
  display: inline-flex;
}

.ui-count {
  position: absolute;
  top: -0.375rem;
  right: -0.375rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  min-width: 1.125rem;
  height: 1.125rem;
  padding: 0 0.3125rem;
  font-family: var(--ui-font);
  font-size: 0.6875rem;
  font-weight: 600;
  line-height: 1.125rem;
  color: var(--ui-danger-text);
  background: var(--ui-danger);
  border-radius: var(--ui-radius-full);
  box-shadow: 0 0 0 2px var(--ui-surface);
  z-index: 1;

  &.primary   { background: var(--ui-primary); color: var(--ui-primary-text); }
  &.secondary { background: var(--ui-secondary); color: var(--ui-secondary-text); }
  &.success   { background: var(--ui-success); color: var(--ui-success-text); }
  &.warning   { background: var(--ui-warning); color: var(--ui-warning-text); }

  /* Positions */
  &.top-left {
    right: auto;
    left: -0.375rem;
  }

  &.bottom-right {
    top: auto;
    bottom: -0.375rem;
  }

  &.bottom-left {
    top: auto;
    bottom: -0.375rem;
    right: auto;
    left: -0.375rem;
  }

  /* Sizes */
  &.sm {
    min-width: 0.875rem;
    height: 0.875rem;
    font-size: 0.5625rem;
    line-height: 0.875rem;
    padding: 0 0.25rem;
    top: -0.25rem;
    right: -0.25rem;
  }

  &.lg {
    min-width: 1.375rem;
    height: 1.375rem;
    font-size: 0.75rem;
    line-height: 1.375rem;
    padding: 0 0.375rem;
    top: -0.5rem;
    right: -0.5rem;
  }

  /* Dot-only (no number) */
  &.dot {
    min-width: 0.5rem;
    width: 0.5rem;
    height: 0.5rem;
    padding: 0;
    top: -0.125rem;
    right: -0.125rem;
  }
}

/* ============================================
   Toast / Snackbar
   ============================================ */

.ui-toast-container {
  position: fixed;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;

  /* Default: bottom-right */
  bottom: 1.5rem;
  right: 1.5rem;

  &.top-right    { bottom: auto; top: 1.5rem; right: 1.5rem; left: auto; }
  &.top-left     { bottom: auto; top: 1.5rem; left: 1.5rem; right: auto; }
  &.bottom-left  { bottom: 1.5rem; left: 1.5rem; right: auto; }
  &.top-center   { bottom: auto; top: 1.5rem; left: 50%; right: auto; transform: translateX(-50%); }
  &.bottom-center { bottom: 1.5rem; left: 50%; right: auto; transform: translateX(-50%); }
}

.ui-toast {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  min-width: 16rem;
  max-width: 24rem;
  padding: 0.75rem 1rem;
  background: var(--ui-surface);
  border: 1px solid var(--ui-border);
  border-radius: var(--ui-radius);
  box-shadow: var(--ui-shadow-lg);
  color: var(--ui-text);
  font-size: var(--ui-font-size);
  pointer-events: auto;
  animation: ui-toast-in 0.25s ease;

  &.success { border-left: 3px solid var(--ui-success); & .ui-toast-icon { color: var(--ui-success); } }
  &.danger  { border-left: 3px solid var(--ui-danger);  & .ui-toast-icon { color: var(--ui-danger); } }
  &.warning { border-left: 3px solid var(--ui-warning); & .ui-toast-icon { color: var(--ui-warning); } }
  &.info    { border-left: 3px solid var(--ui-primary); & .ui-toast-icon { color: var(--ui-primary); } }
}

.ui-toast-icon {
  flex-shrink: 0;
  font-size: 1.125rem;
}

.ui-toast-body {
  flex: 1;
  min-width: 0;
}

.ui-toast-close {
  flex-shrink: 0;
  background: none;
  border: none;
  color: var(--ui-text-muted);
  font-size: 1.125rem;
  cursor: pointer;
  padding: 0;
  line-height: 1;

  &:hover { color: var(--ui-text); }
}

@keyframes ui-toast-in {
  from { opacity: 0; transform: translateY(0.5rem); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============================================
   Progress bar
   ============================================ */

.ui-progress {
  width: 100%;
  height: 0.5rem;
  background: var(--ui-bg-subtle);
  border-radius: var(--ui-radius-full);
  overflow: hidden;

  &.sm { height: 0.25rem; }
  &.lg { height: 0.75rem; }
}

.ui-progress-bar {
  height: 100%;
  background: var(--ui-primary);
  border-radius: var(--ui-radius-full);
  transition: width 0.3s ease;

  &.success { background: var(--ui-success); }
  &.danger  { background: var(--ui-danger); }
  &.warning { background: var(--ui-warning); }

  &.striped {
    background-image: linear-gradient(
      45deg,
      rgba(255,255,255,0.15) 25%, transparent 25%,
      transparent 50%, rgba(255,255,255,0.15) 50%,
      rgba(255,255,255,0.15) 75%, transparent 75%,
      transparent
    );
    background-size: 1rem 1rem;
  }

  &.animated {
    animation: ui-progress-stripes 1s linear infinite;
  }
}

.ui-progress-labeled {
  height: 1.25rem;

  & .ui-progress-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.6875rem;
    font-weight: 600;
    color: #ffffff;
  }
}

@keyframes ui-progress-stripes {
  from { background-position: 1rem 0; }
  to   { background-position: 0 0; }
}

/* ============================================
   Skeleton / Placeholder
   ============================================ */

.ui-skeleton {
  background: var(--ui-bg-subtle);
  border-radius: var(--ui-radius);
  animation: ui-skeleton-pulse 1.5s ease-in-out infinite;

  &.text {
    height: 0.875rem;
    width: 100%;
    border-radius: var(--ui-radius-sm);
  }

  &.heading {
    height: 1.5rem;
    width: 60%;
    border-radius: var(--ui-radius-sm);
  }

  &.circle {
    border-radius: var(--ui-radius-full);
  }

  &.rounded {
    border-radius: var(--ui-radius-lg);
  }
}

@keyframes ui-skeleton-pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.4; }
}

/* ============================================
   Avatar
   ============================================ */

.ui-avatar {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--ui-radius-full);
  background: var(--ui-primary-light);
  color: var(--ui-primary);
  font-weight: 600;
  font-size: 0.875rem;
  flex-shrink: 0;
  cursor: pointer;
  user-select: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;

  &:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    background: color-mix(in srgb, var(--ui-primary) 20%, var(--ui-primary-light));
  }

  &:active {
    transform: translateY(0) scale(0.95);
    box-shadow: none;
    background: color-mix(in srgb, var(--ui-primary) 30%, var(--ui-primary-light));
  }

  & img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: inherit;
  }

  &.sm { width: 1.75rem; height: 1.75rem; font-size: 0.6875rem; }
  &.lg { width: 3.5rem; height: 3.5rem; font-size: 1.125rem; }
  &.xl { width: 5rem; height: 5rem; font-size: 1.5rem; }

  &.square { border-radius: var(--ui-radius); }
}

.ui-avatar-status {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 0.75rem;
  height: 0.75rem;
  border-radius: var(--ui-radius-full);
  border: 2px solid var(--ui-surface);
  background: var(--ui-secondary);

  &.online  { background: var(--ui-success); }
  &.offline { background: var(--ui-secondary); }
  &.busy    { background: var(--ui-danger); }
  &.away    { background: var(--ui-warning); }
}

.ui-avatar.lg .ui-avatar-status {
  width: 0.875rem;
  height: 0.875rem;
}

.ui-avatar.xl .ui-avatar-status {
  width: 1rem;
  height: 1rem;
}

.ui-avatar-group {
  display: flex;

  & .ui-avatar {
    border: 2px solid var(--ui-surface);
  }

  & .ui-avatar + .ui-avatar {
    margin-left: -0.625rem;
  }
}

/* ============================================
   Breadcrumb
   ============================================ */

.ui-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: var(--ui-font-size);
  color: var(--ui-text-muted);
  list-style: none;
  padding: 0;
  margin: 0;
  flex-wrap: wrap;

  & li {
    display: flex;
    align-items: center;
    gap: 0.25rem;
  }

  & li + li::before {
    content: '/';
    color: var(--ui-text-muted);
    opacity: 0.5;
    margin-right: 0.125rem;
  }

  & a {
    color: var(--ui-text-muted);
    text-decoration: none;
    transition: color var(--ui-transition);

    &:hover { color: var(--ui-primary); }
  }

  & li:last-child {
    color: var(--ui-text);
    font-weight: 500;
  }
}

/* ============================================
   Card
   ============================================ */

.ui-card {
  display: flex;
  flex-direction: column;
  background: var(--ui-surface);
  border: 1px solid var(--ui-border);
  border-radius: var(--ui-radius-lg);
  overflow: hidden;
}

.ui-card-img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
}

.ui-card-body {
  padding: 1rem 1.25rem;
  flex: 1;
}

.ui-card-title {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.375rem;
}

.ui-card-text {
  color: var(--ui-text-muted);
  font-size: var(--ui-font-size);
  margin: 0;
}

.ui-card-header {
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--ui-border);
  font-weight: 600;
  font-size: var(--ui-font-size);
}

.ui-card-footer {
  padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--ui-border);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.ui-card.flat {
  box-shadow: none;
}

.ui-card.elevated {
  border: none;
  box-shadow: var(--ui-shadow-lg);
}

/* ============================================
   Accordion / Collapsible
   ============================================ */

.ui-accordion {
  border: 1px solid var(--ui-border);
  border-radius: var(--ui-radius);
  overflow: hidden;
}

.ui-accordion details {
  border-bottom: 1px solid var(--ui-border);

  &:last-child { border-bottom: none; }
}

.ui-accordion summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  font-weight: 500;
  font-size: var(--ui-font-size);
  cursor: pointer;
  user-select: none;
  background: var(--ui-surface);
  transition: background var(--ui-transition);
  list-style: none;

  &::-webkit-details-marker { display: none; }
  &::marker { display: none; }

  &::after {
    content: '';
    width: 0.5rem;
    height: 0.5rem;
    border-right: 2px solid var(--ui-text-muted);
    border-bottom: 2px solid var(--ui-text-muted);
    transform: rotate(-45deg);
    transition: transform 0.2s ease;
    flex-shrink: 0;
  }

  &:hover { background: var(--ui-bg-subtle); }
}

.ui-accordion details[open] > summary::after {
  transform: rotate(45deg);
}

.ui-accordion-body {
  padding: 0.75rem 1rem;
  font-size: var(--ui-font-size);
  color: var(--ui-text-muted);
}

/* ============================================
   Slider / Range
   ============================================ */

.ui-range {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 0.375rem;
  background: var(--ui-bg-subtle);
  border-radius: var(--ui-radius-full);
  outline: none;
  cursor: pointer;

  &::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 1.125rem;
    height: 1.125rem;
    border-radius: var(--ui-radius-full);
    background: var(--ui-primary);
    border: 2px solid var(--ui-surface);
    box-shadow: var(--ui-shadow-sm);
    cursor: pointer;
    transition: transform var(--ui-transition), box-shadow var(--ui-transition);
  }

  &::-moz-range-thumb {
    width: 1.125rem;
    height: 1.125rem;
    border-radius: var(--ui-radius-full);
    background: var(--ui-primary);
    border: 2px solid var(--ui-surface);
    box-shadow: var(--ui-shadow-sm);
    cursor: pointer;
    transition: transform var(--ui-transition), box-shadow var(--ui-transition);
  }

  &:hover::-webkit-slider-thumb {
    transform: scale(1.15);
    box-shadow: var(--ui-shadow);
  }

  &:hover::-moz-range-thumb {
    transform: scale(1.15);
    box-shadow: var(--ui-shadow);
  }

  &:focus-visible::-webkit-slider-thumb {
    outline: 2px solid var(--ui-primary);
    outline-offset: 2px;
  }

  &:focus-visible::-moz-range-thumb {
    outline: 2px solid var(--ui-primary);
    outline-offset: 2px;
  }

  &.success {
    &::-webkit-slider-thumb { background: var(--ui-success); }
    &::-moz-range-thumb     { background: var(--ui-success); }
  }

  &.danger {
    &::-webkit-slider-thumb { background: var(--ui-danger); }
    &::-moz-range-thumb     { background: var(--ui-danger); }
  }

  &.sm {
    height: 0.25rem;

    &::-webkit-slider-thumb { width: 0.875rem; height: 0.875rem; }
    &::-moz-range-thumb     { width: 0.875rem; height: 0.875rem; }
  }

  &.lg {
    height: 0.5rem;

    &::-webkit-slider-thumb { width: 1.375rem; height: 1.375rem; }
    &::-moz-range-thumb     { width: 1.375rem; height: 1.375rem; }
  }

  &:disabled {
    opacity: 0.5;
    cursor: not-allowed;
  }
}