@layer iwt-base, iwt-layout, iwt-components, iwt-states;

@layer iwt-base {
  .iwt-scope {
    min-width: 320px;
    color: var(--text-primary);
    background: var(--surface-page);
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: var(--line-height-body);
  }

  .iwt-scope *,
  .iwt-scope *::before,
  .iwt-scope *::after {
    box-sizing: border-box;
  }

  .iwt-scope :where(button, input, select, textarea) {
    font: inherit;
  }

  .iwt-scope :where(button, a, input, select, textarea, summary):focus-visible {
    outline: 3px solid var(--focus-ring);
    outline-offset: 3px;
  }

  .iwt-scope :where(button, a) {
    touch-action: manipulation;
  }

  .iwt-scope :where(h1, h2, h3, p) {
    margin-block-start: 0;
  }

  .iwt-scope :where(img, svg) {
    display: block;
    max-width: 100%;
  }

  .iwt-visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
  }

  .iwt-display {
    margin-block-end: var(--space-5);
    font-family: var(--font-display);
    font-size: var(--text-display-m);
    font-weight: 500;
    line-height: var(--line-height-tight);
    letter-spacing: -.045em;
  }

  .iwt-heading {
    margin-block-end: var(--space-3);
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 2.4vw, 2.25rem);
    font-weight: 500;
    line-height: 1.08;
    letter-spacing: -.035em;
  }

  .iwt-label {
    color: var(--text-secondary);
    font-family: var(--font-utility);
    font-size: var(--text-label);
    font-weight: 500;
    letter-spacing: .08em;
    line-height: 1.3;
    text-transform: uppercase;
  }

  .iwt-copy {
    max-width: 65ch;
    color: var(--text-secondary);
  }
}

@layer iwt-components {
  .iwt-media {
    position: relative;
    display: grid;
    min-height: 18rem;
    margin: 0;
    overflow: hidden;
    border-radius: var(--media-radius);
    isolation: isolate;
    background: var(--surface-deep);
    aspect-ratio: var(--iwt-media-aspect, var(--media-aspect-product));
  }

  .iwt-media--story {
    --iwt-media-aspect: var(--media-aspect-story);
  }

  .iwt-media--detail {
    --iwt-media-aspect: var(--media-aspect-detail);
  }

  .iwt-media > :where(img, video) {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: var(--iwt-media-position, 50% 50%);
  }

  .iwt-media__content {
    position: relative;
    z-index: 1;
    display: grid;
    max-width: 44rem;
    padding: clamp(var(--space-5), 6vw, var(--space-10));
    align-content: end;
    color: var(--text-on-dark);
    background: var(--iwt-media-scrim, var(--media-scrim-soft));
  }

  .iwt-media__content--bottom {
    max-width: none;
    background: var(--media-scrim-strong);
  }

  .iwt-route {
    --iwt-route-count: 4;
    --iwt-route-progress: .5;
    position: relative;
    display: grid;
    grid-template-columns: repeat(var(--iwt-route-count), minmax(0, 1fr));
    gap: var(--space-2);
    margin: 0;
    padding: 0;
    list-style: none;
  }

  .iwt-route::before,
  .iwt-route::after {
    content: "";
    position: absolute;
    top: calc(var(--route-node-size) / 2);
    right: calc(var(--route-node-size) / 2);
    left: calc(var(--route-node-size) / 2);
    height: var(--route-line-width);
    border-radius: var(--radius-control);
    transform: translateY(-50%);
    pointer-events: none;
  }

  .iwt-route::before {
    background: var(--route-track);
  }

  .iwt-route::after {
    background: var(--route-line);
    transform: translateY(-50%) scaleX(var(--iwt-route-progress));
    transform-origin: left;
  }

  .iwt-route__item {
    position: relative;
    z-index: 1;
    display: grid;
    gap: var(--space-2);
    justify-items: start;
    color: var(--text-secondary);
    font-size: .78rem;
  }

  .iwt-route__item::before {
    content: "";
    width: var(--route-node-size);
    height: var(--route-node-size);
    border: var(--route-line-width) solid var(--route-track);
    border-radius: 50%;
    background: var(--surface-page);
  }

  .iwt-route__item[data-complete="true"]::before,
  .iwt-route__item[aria-current="step"]::before {
    border-color: var(--route-line);
    background: var(--route-line);
  }

  .iwt-route__item[aria-current="step"] {
    color: var(--text-primary);
    font-weight: 600;
  }

  .iwt-route--on-dark {
    color: var(--text-on-dark);
  }

  .iwt-route--on-dark::before {
    background: var(--route-track-on-dark);
  }

  .iwt-route--on-dark::after {
    background: var(--route-line-on-dark);
  }

  .iwt-route--on-dark .iwt-route__item {
    color: color-mix(in srgb, var(--text-on-dark) 72%, transparent);
  }

  .iwt-route--on-dark .iwt-route__item::before {
    border-color: var(--route-track-on-dark);
    background: var(--surface-deep);
  }

  .iwt-route--on-dark .iwt-route__item[data-complete="true"]::before,
  .iwt-route--on-dark .iwt-route__item[aria-current="step"]::before {
    border-color: var(--route-line-on-dark);
    background: var(--route-line-on-dark);
  }

  .iwt-route--on-dark .iwt-route__item[aria-current="step"] {
    color: var(--text-on-dark);
  }

  @media (prefers-reduced-motion: no-preference) {
    .iwt-route::after {
      animation: iwt-route-reveal var(--duration-story) var(--ease-quiet) both;
    }
  }

  @media (max-width: 480px) {
    .iwt-route {
      grid-template-columns: 1fr;
      gap: var(--space-3);
    }

    .iwt-route::before,
    .iwt-route::after {
      top: calc(var(--route-node-size) / 2);
      bottom: calc(var(--route-node-size) / 2);
      left: calc(var(--route-node-size) / 2);
      width: var(--route-line-width);
      height: auto;
      transform: translateX(-50%);
    }

    .iwt-route::after {
      transform: translateX(-50%) scaleY(var(--iwt-route-progress));
      transform-origin: top;
      animation-name: iwt-route-reveal-vertical;
    }

    .iwt-route__item {
      grid-template-columns: var(--route-node-size) 1fr;
      align-items: center;
    }
  }
}

@keyframes iwt-route-reveal {
  from {
    opacity: 0;
    transform: translateY(-50%) scaleX(0);
  }
}

@keyframes iwt-route-reveal-vertical {
  from {
    opacity: 0;
    transform: translateX(-50%) scaleY(0);
  }
}

@layer iwt-layout {
  .iwt-shell {
    width: min(calc(100% - (var(--space-5) * 2)), var(--content-max));
    margin-inline: auto;
  }

  .iwt-reading {
    max-width: var(--content-max-reading);
  }

  .iwt-stack {
    display: grid;
    gap: var(--iwt-stack-gap, var(--space-4));
  }

  .iwt-stack > *,
  .iwt-grid > *,
  .iwt-split > * {
    min-width: 0;
  }

  .iwt-cluster {
    display: flex;
    flex-wrap: wrap;
    gap: var(--iwt-cluster-gap, var(--space-3));
    align-items: center;
  }

  .iwt-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, var(--iwt-grid-min, 16rem)), 1fr));
    gap: var(--iwt-grid-gap, var(--space-4));
  }

  .iwt-split {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(17rem, .85fr);
    gap: var(--space-6);
    align-items: start;
  }
}

@layer iwt-components {
  .iwt-button {
    --iwt-button-background: var(--action-primary);
    --iwt-button-border: transparent;
    --iwt-button-color: var(--text-on-dark);
    display: inline-flex;
    min-height: var(--control-height);
    padding: var(--space-3) var(--space-5);
    border: 1px solid var(--iwt-button-border);
    border-radius: var(--radius-control);
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    color: var(--iwt-button-color);
    background: var(--iwt-button-background);
    box-shadow: none;
    font-weight: 600;
    line-height: 1;
    text-decoration: none;
    white-space: nowrap;
    cursor: pointer;
    transition: transform var(--duration-micro) var(--ease-quiet), background-color var(--duration-micro) var(--ease-quiet), border-color var(--duration-micro) var(--ease-quiet);
  }

  .iwt-button:hover {
    transform: translateY(-1px);
  }

  .iwt-button:active {
    transform: translateY(1px);
  }

  .iwt-button--secondary {
    --iwt-button-background: var(--surface-page);
    --iwt-button-border: var(--border-strong);
    --iwt-button-color: var(--text-primary);
  }

  .iwt-button--quiet {
    --iwt-button-background: transparent;
    --iwt-button-border: transparent;
    --iwt-button-color: var(--text-secondary);
  }

  .iwt-button--accent {
    --iwt-button-background: var(--action-accent);
    --iwt-button-color: var(--surface-deep);
  }

  .iwt-button--danger {
    --iwt-button-background: var(--status-danger-text);
    --iwt-button-color: var(--text-on-danger);
  }

  .iwt-button--compact {
    min-height: var(--touch-target-min);
    padding: var(--space-2) var(--space-3);
    font-size: .84rem;
  }

  .iwt-button[disabled],
  .iwt-button[aria-disabled="true"] {
    opacity: .48;
    pointer-events: none;
    cursor: not-allowed;
  }

  .iwt-panel {
    padding: var(--space-5);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-card);
    background: var(--surface-raised);
    box-shadow: var(--shadow-subtle);
  }

  .iwt-panel--muted {
    background: var(--surface-muted);
    box-shadow: none;
  }

  .iwt-panel--strong {
    border-color: var(--glass-edge-dark);
    color: var(--text-on-dark);
    background: var(--surface-strong);
    box-shadow: var(--shadow-soft);
  }

  .iwt-panel--glass-light {
    border-color: var(--glass-edge-light);
    background: var(--glass-light);
    box-shadow: var(--shadow-floating), inset 0 1px var(--glass-edge-light);
    backdrop-filter: var(--glass-blur);
  }

  .iwt-panel--glass-dark {
    border-color: var(--glass-edge-dark);
    color: var(--text-on-dark);
    background: var(--glass-dark), var(--surface-deep);
    box-shadow: inset 0 1px var(--glass-edge-light), var(--shadow-soft);
    backdrop-filter: var(--glass-blur);
  }

  .iwt-nav {
    display: flex;
    min-height: 64px;
    padding: var(--space-2) var(--space-2) var(--space-2) var(--space-4);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-control);
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    background: var(--glass-light);
    box-shadow: var(--shadow-subtle);
    backdrop-filter: var(--glass-blur);
  }

  .iwt-nav__brand {
    color: var(--text-primary);
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: -.03em;
    text-decoration: none;
  }

  .iwt-nav__links {
    display: flex;
    gap: var(--space-5);
    align-items: center;
  }

  .iwt-nav__link {
    color: var(--text-secondary);
    font-size: .88rem;
    font-weight: 500;
    text-decoration: none;
  }

  .iwt-nav__link[aria-current="page"] {
    color: var(--text-primary);
    text-decoration: underline;
    text-decoration-color: var(--action-accent);
    text-decoration-thickness: 2px;
    text-underline-offset: .35rem;
  }

  .iwt-field {
    display: grid;
    gap: var(--space-2);
  }

  .iwt-field__label {
    color: var(--text-primary);
    font-size: .84rem;
    font-weight: 600;
  }

  .iwt-field__hint,
  .iwt-field__message {
    margin: 0;
    color: var(--text-secondary);
    font-size: .8rem;
    line-height: 1.4;
  }

  .iwt-field__control {
    width: 100%;
    min-height: var(--control-height);
    padding: var(--space-3);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-small);
    color: var(--text-primary);
    background: var(--surface-page);
    transition: border-color var(--duration-micro) var(--ease-quiet), box-shadow var(--duration-micro) var(--ease-quiet);
  }

  textarea.iwt-field__control {
    min-height: 7.5rem;
    resize: vertical;
  }

  .iwt-field__control::placeholder {
    color: var(--text-tertiary);
  }

  .iwt-field__control:hover {
    border-color: var(--text-secondary);
  }

  .iwt-field__control:focus-visible {
    border-color: var(--text-primary);
    box-shadow: 0 0 0 1px var(--text-primary);
  }

  .iwt-field[data-invalid="true"] .iwt-field__control {
    border-color: var(--status-danger-text);
    background: var(--status-danger-surface);
  }

  .iwt-field[data-invalid="true"] .iwt-field__message {
    color: var(--status-danger-text);
  }

  .iwt-field__control:disabled {
    opacity: .58;
    cursor: not-allowed;
  }

  .iwt-choice {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--space-3);
    align-items: start;
    color: var(--text-secondary);
    cursor: pointer;
  }

  .iwt-choice input {
    width: 1.15rem;
    height: 1.15rem;
    margin-block-start: .2rem;
    accent-color: var(--action-primary);
  }

  .iwt-segmented {
    display: inline-flex;
    padding: var(--space-1);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-control);
    gap: var(--space-1);
    background: var(--surface-muted);
  }

  .iwt-segmented__item {
    min-height: max(var(--control-height-compact), var(--touch-target-min));
    padding: var(--space-2) var(--space-3);
    border: 0;
    border-radius: var(--radius-control);
    color: var(--text-secondary);
    background: transparent;
    font-size: .84rem;
    font-weight: 600;
    cursor: pointer;
  }

  .iwt-segmented__item[aria-pressed="true"],
  .iwt-segmented__item[aria-selected="true"] {
    color: var(--text-primary);
    background: var(--surface-page);
    box-shadow: var(--shadow-subtle);
  }

  .iwt-status {
    display: inline-flex;
    min-height: 1.75rem;
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-control);
    align-items: center;
    color: var(--status-info-text);
    background: var(--status-info-surface);
    font-family: var(--font-utility);
    font-size: .68rem;
    font-weight: 600;
    letter-spacing: .04em;
  }

  .iwt-status--success {
    color: var(--status-success-text);
    background: var(--status-success-surface);
  }

  .iwt-status--warning {
    color: var(--status-warning-text);
    background: var(--status-warning-surface);
  }

  .iwt-status--danger {
    color: var(--status-danger-text);
    background: var(--status-danger-surface);
  }

  .iwt-alert {
    display: grid;
    grid-template-columns: .35rem 1fr;
    overflow: hidden;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-medium);
    color: var(--status-info-text);
    background: var(--status-info-surface);
  }

  .iwt-alert::before {
    content: "";
    background: currentColor;
  }

  .iwt-alert__body {
    padding: var(--space-4);
  }

  .iwt-alert__body > :last-child {
    margin-block-end: 0;
  }

  .iwt-alert--success {
    color: var(--status-success-text);
    background: var(--status-success-surface);
  }

  .iwt-alert--warning {
    color: var(--status-warning-text);
    background: var(--status-warning-surface);
  }

  .iwt-alert--danger {
    color: var(--status-danger-text);
    background: var(--status-danger-surface);
  }

  .iwt-stepper {
    display: grid;
    grid-template-columns: repeat(var(--iwt-step-count, 3), minmax(0, 1fr));
    gap: var(--space-2);
    padding: 0;
    margin: 0;
    list-style: none;
  }

  .iwt-stepper__item {
    display: grid;
    gap: var(--space-2);
    color: var(--text-tertiary);
    font-size: .78rem;
  }

  .iwt-stepper__item::before {
    height: .25rem;
    border-radius: var(--radius-control);
    content: "";
    background: var(--border-strong);
  }

  .iwt-stepper__item[data-complete="true"],
  .iwt-stepper__item[aria-current="step"] {
    color: var(--text-primary);
    font-weight: 600;
  }

  .iwt-stepper__item[data-complete="true"]::before {
    background: var(--action-accent);
  }

  .iwt-stepper__item[aria-current="step"]::before {
    background: var(--action-primary);
  }

  .iwt-decision {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(14rem, .6fr);
    gap: var(--space-5);
    padding: var(--space-5);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-card);
    background: var(--surface-raised);
    box-shadow: var(--shadow-floating);
  }

  .iwt-decision__summary {
    display: grid;
    align-content: space-between;
    gap: var(--space-5);
    padding: var(--space-4);
    border-radius: var(--radius-medium);
    color: var(--text-on-dark);
    background: var(--surface-strong);
  }

  .iwt-price {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--space-4);
    font-variant-numeric: tabular-nums;
  }

  .iwt-price strong {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 500;
  }

  .iwt-summary-list {
    display: grid;
    gap: var(--space-3);
    margin: 0;
  }

  .iwt-summary-list > div {
    display: grid;
    grid-template-columns: minmax(7rem, .6fr) 1fr;
    gap: var(--space-4);
  }

  .iwt-summary-list dt {
    color: var(--text-secondary);
    font-size: .78rem;
  }

  .iwt-summary-list dd {
    margin: 0;
    font-weight: 600;
  }

  .iwt-record {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: var(--space-4);
    padding: var(--space-4);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-medium);
    background: var(--surface-page);
  }

  .iwt-record__meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2) var(--space-4);
    margin: 0;
    color: var(--text-secondary);
    font-family: var(--font-utility);
    font-size: .72rem;
  }

  .iwt-table-wrap {
    overflow-x: auto;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-medium);
    background: var(--surface-page);
  }

  .iwt-table {
    width: 100%;
    border-collapse: collapse;
    font-size: .86rem;
  }

  .iwt-table th,
  .iwt-table td {
    padding: var(--space-3) var(--space-4);
    border-block-end: 1px solid var(--border-subtle);
    text-align: left;
    vertical-align: middle;
  }

  .iwt-table th {
    color: var(--text-secondary);
    background: var(--surface-muted);
    font-family: var(--font-utility);
    font-size: .68rem;
    letter-spacing: .05em;
    text-transform: uppercase;
  }

  .iwt-table tbody tr:last-child td {
    border-block-end: 0;
  }

  .iwt-table__number {
    font-variant-numeric: tabular-nums;
  }

  .iwt-calendar {
    display: grid;
    grid-template-columns: repeat(7, minmax(3.5rem, 1fr));
    overflow-x: auto;
    border-block-start: 1px solid var(--border-subtle);
    border-inline-start: 1px solid var(--border-subtle);
  }

  .iwt-calendar__day {
    min-height: 7rem;
    padding: var(--space-2);
    border-block-end: 1px solid var(--border-subtle);
    border-inline-end: 1px solid var(--border-subtle);
    background: var(--surface-page);
  }

  .iwt-calendar__date {
    color: var(--text-secondary);
    font-family: var(--font-utility);
    font-size: .7rem;
  }

  .iwt-calendar__event {
    display: block;
    margin-block-start: var(--space-2);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-small);
    color: var(--status-info-text);
    background: var(--status-info-surface);
    font-size: .72rem;
    text-decoration: none;
  }

  .iwt-empty {
    display: grid;
    min-height: 15rem;
    padding: var(--space-6);
    border: 1px dashed var(--border-strong);
    border-radius: var(--radius-card);
    place-items: center;
    text-align: center;
    background: var(--surface-muted);
  }

  .iwt-dialog {
    width: min(calc(100% - (var(--space-5) * 2)), 34rem);
    padding: 0;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-card);
    color: var(--text-primary);
    background: var(--surface-page);
    box-shadow: var(--shadow-floating);
  }

  .iwt-dialog::backdrop {
    background: var(--surface-scrim);
    backdrop-filter: blur(4px);
  }

  .iwt-dialog__body {
    padding: var(--space-6);
  }

  .iwt-dialog__actions {
    display: flex;
    flex-wrap: wrap;
    padding: 0 var(--space-6) var(--space-6);
    justify-content: flex-end;
    gap: var(--space-2);
  }

  .iwt-toast {
    position: fixed;
    z-index: var(--z-dialog);
    right: var(--space-4);
    bottom: var(--space-4);
    display: grid;
    width: min(calc(100% - (var(--space-4) * 2)), 24rem);
    padding: var(--space-4);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-medium);
    gap: var(--space-2);
    color: var(--text-on-dark);
    background: var(--surface-deep);
    box-shadow: var(--shadow-floating);
  }

  .iwt-toast[hidden] {
    display: none;
  }

  .iwt-skeleton {
    min-height: 1rem;
    border-radius: var(--radius-small);
    background: linear-gradient(90deg, var(--surface-muted), var(--surface-page), var(--surface-muted));
    background-size: 220% 100%;
    animation: iwt-skeleton 1.5s var(--ease-quiet) infinite;
  }
}

@layer iwt-states {
  @keyframes iwt-skeleton {
    to { background-position: -220% 0; }
  }

  @media (max-width: 899px) {
    .iwt-split,
    .iwt-decision {
      grid-template-columns: 1fr;
    }

    .iwt-nav {
      align-items: flex-start;
      border-radius: var(--radius-card);
      flex-direction: column;
    }

    .iwt-nav__links {
      width: 100%;
      overflow-x: auto;
    }
  }

  @media (max-width: 480px) {
    .iwt-shell {
      width: min(calc(100% - (var(--space-4) * 2)), var(--content-max));
    }

    .iwt-record,
    .iwt-summary-list > div {
      grid-template-columns: 1fr;
    }

    .iwt-stepper {
      grid-template-columns: 1fr;
    }

    .iwt-stepper__item {
      grid-template-columns: .35rem 1fr;
      align-items: center;
    }

    .iwt-stepper__item::before {
      width: .35rem;
      height: 100%;
      min-height: 2rem;
    }
  }

  @media (prefers-reduced-motion: reduce) {
    .iwt-scope *,
    .iwt-scope *::before,
    .iwt-scope *::after {
      scroll-behavior: auto !important;
      transition-duration: .01ms !important;
      animation-duration: .01ms !important;
      animation-iteration-count: 1 !important;
    }
  }

  @media (prefers-reduced-transparency: reduce) {
    .iwt-panel--glass-light,
    .iwt-nav {
      background: var(--surface-page);
      backdrop-filter: none;
    }

    .iwt-panel--glass-dark {
      background: var(--surface-deep);
      backdrop-filter: none;
    }
  }
}