@layer reset, tokens, base, layout, bento, states, dialogs, utilities;

/* ==========================================================================
   LAYER: RESET (Element-specific reset — avoids global `*` selector per modern CSS architecture)
   ========================================================================== */
@layer reset {
  :where(
    html, body, div, span, header, nav, main, section, article, aside, footer,
    h1, h2, h3, h4, hgroup, p, ul, ol, li, dl, dt, dd, figure, figcaption,
    blockquote, pre, code, a, button, input, select, textarea, label, fieldset,
    legend, dialog, details, summary, table, caption, thead, tbody, tr, th, td,
    svg, canvas, progress
  ) {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }

  :where(ul, ol) {
    list-style: none;
  }

  :where(img, svg, canvas, video) {
    display: block;
    max-inline-size: 100%;
  }

  :where(button, input, select, textarea) {
    font: inherit;
    color: inherit;
  }

  :where(button) {
    cursor: pointer;
    background: transparent;
    border: none;
  }

  :where(a) {
    color: inherit;
    text-decoration: none;
  }

  :where(p, span, li) > :where(code) {
    font-family: var(--font-mono, ui-monospace, monospace);
    font-size: 0.9em;
    padding: 0.08rem 0.34rem;
    margin-inline: 0.1rem;
    border-radius: 5px;
    background: rgba(148, 163, 184, 0.15);
  }

  :where(table) {
    border-collapse: collapse;
  }
}

/* ==========================================================================
   LAYER: BASE (Accessibility, Focus, View Transitions & Forced Colors)
   ========================================================================== */
@layer base {
  :root {
    color-scheme: light dark;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
  }

  :root[data-theme="light"] {
    color-scheme: light;
  }

  :root[data-theme="dark"] {
    color-scheme: dark;
  }

  html,
  body {
    inline-size: 100%;
    min-block-size: 100dvh;
  }

  /* Desktop Single-Page Full-Screen Lock (gracefully unlocks on narrow/short/zoomed viewports) */
  @media (min-width: 1024px) and (min-height: 680px) {
    html,
    body.fullscreen-bento {
      block-size: 100dvh;
      overflow: clip;
    }
  }

  @media (max-width: 1023.98px), (max-height: 679.98px) {
    html,
    body.fullscreen-bento {
      block-size: auto;
      min-block-size: 100dvh;
      overflow-x: clip;
      overflow-y: auto;
    }
  }

  /* High-contrast focus indicators (WCAG 2.4.7 & 1.4.11 >= 3:1) */
  :where(a:any-link, button, input, select, textarea, summary, [tabindex="0"]):focus-visible {
    outline: 2.5px solid var(--focus-ring, #00d2ff);
    outline-offset: 2.5px;
  }

  :where([tabindex="-1"]):focus {
    outline: none;
  }

  /* Prevent typographic orphans on short headings and body copy */
  :where(h1, h2, h3) {
    text-wrap: balance;
  }

  :where(p, li) {
    text-wrap: pretty;
  }

  /* Interactive target minimum sizing (WCAG 2.5.8 >= 24x24px, coarse >= 44x44px) */
  :where(button, a.pill-btn, .interactive-chip, input[type="range"]) {
    min-block-size: 26px;
    min-inline-size: 26px;
  }

  @media (pointer: coarse) {
    :where(
      button,
      a.pill-btn,
      .modal-primary-btn,
      .modal-close-btn,
      .interactive-chip,
      select,
      input:not([type="checkbox"], [type="radio"])
    ) {
      min-block-size: 44px;
      min-inline-size: 44px;
    }

    @media (max-width: 1023.98px) {
      :where(.aurora-btn-primary, .aurora-btn-ghost, a.aurora-chip) {
        min-block-size: 44px;
        min-inline-size: 44px;
      }
    }
  }

  /* View Transitions shared group behavior */
  ::view-transition {
    pointer-events: none;
  }

  ::view-transition-group(.bento-vt) {
    animation-duration: 460ms;
    animation-timing-function: cubic-bezier(0.22, 1, 0.36, 1);
  }

  /* Respect user preference for reduced motion */
  @media (prefers-reduced-motion: reduce) {
    ::view-transition-group(*),
    ::view-transition-old(*),
    ::view-transition-new(*) {
      animation: none !important;
    }
  }

  /* Forced Colors Mode (Windows High Contrast) resilient boundaries */
  @media (forced-colors: active) {
    .bento-card,
    .card-face,
    dialog,
    .concept-dock,
    .aurora-dock,
    .aurora-footer {
      border: 1px solid CanvasText !important;
      box-shadow: none !important;
      background-image: none !important;
    }

    :where(a:any-link, button, input, select, textarea, summary, [tabindex="0"]):focus-visible {
      outline: 3px solid Highlight !important;
    }
  }
}

/* ==========================================================================
   LAYER: DIALOGS (Native <dialog closedby="any"> + Top-Layer Entry/Exit Animations)
   ========================================================================== */
@layer dialogs {
  dialog.ca-modal {
    margin: auto;
    inline-size: min(640px, calc(100% - 1.25rem));
    max-block-size: 90vh;
    max-block-size: min(90dvh, 720px);
    flex-direction: column;
    overflow: clip;
    border-radius: 20px;
    border: 1px solid var(--modal-border, rgba(140, 165, 200, 0.28));
    background: var(--modal-bg, #0d1524);
    color: var(--modal-fg, #f1f5f9);
    padding: clamp(1.05rem, 3vw, 1.85rem);
    box-shadow: 0 28px 70px rgba(0, 0, 0, 0.52);

    opacity: 0;
    transition-property: opacity, transform, display, overlay;
    transition-duration: 0.26s;
    transition-timing-function: cubic-bezier(0.22, 1, 0.36, 1);
    transition-behavior: allow-discrete;

    @media (prefers-reduced-motion: no-preference) {
      transform: translateY(10px) scale(0.96);
    }

    @media (prefers-reduced-motion: reduce) {
      transition-duration: 0.1s;
    }
  }

  dialog.ca-modal[open] {
    display: flex;
  }

  dialog.ca-modal::backdrop {
    background-color: rgba(4, 8, 18, 0);
    backdrop-filter: blur(0px);
    transition-property: background-color, backdrop-filter, display, overlay;
    transition-duration: 0.26s;
    transition-timing-function: ease-out;
    transition-behavior: allow-discrete;
  }

  :is(dialog.ca-modal[open]):where(:not([data-closing])) {
    opacity: 1;

    @starting-style {
      opacity: 0;
    }

    @media (prefers-reduced-motion: no-preference) {
      transform: translateY(0) scale(1);

      @starting-style {
        transform: translateY(10px) scale(0.96);
      }
    }

    &::backdrop {
      background-color: rgba(4, 8, 18, 0.68);
      backdrop-filter: blur(6px);

      @starting-style {
        background-color: rgba(4, 8, 18, 0);
        backdrop-filter: blur(0px);
      }
    }
  }

  .modal-header {
    flex: 0 0 auto;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 0.85rem;
    padding-block-end: 0.85rem;
    border-block-end: 1px solid var(--modal-divider, rgba(148, 163, 184, 0.2));
  }

  .modal-header > :not(button, a) {
    flex: 1 1 0%;
    min-inline-size: 0;
  }

  .modal-eyebrow {
    display: inline-flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.25rem 0.4rem;
    font-size: 0.72rem;
    font-weight: 700;
    line-height: 1.35;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--modal-accent, #38bdf8);
    margin-block-end: 0.3rem;
  }

  .modal-title {
    font-size: clamp(1.15rem, 1rem + 0.6vw, 1.5rem);
    font-weight: 700;
    line-height: 1.2;
  }

  .modal-close-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    padding: 0.4rem 0.78rem;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 600;
    white-space: nowrap;
    flex-shrink: 0;
    border: 1px solid var(--modal-divider, rgba(148, 163, 184, 0.3));
    background: var(--modal-chip-bg, rgba(255, 255, 255, 0.06));
    color: inherit;
    transition: background-color 0.18s ease, border-color 0.18s ease;
  }

  .modal-close-btn:hover:not(:disabled) {
    background: var(--modal-chip-hover, rgba(56, 189, 248, 0.16));
    border-color: var(--modal-accent, #38bdf8);
  }

  .modal-close-btn:focus-visible {
    border-color: var(--modal-accent, #047857);
    outline: 2px solid var(--modal-accent, #047857);
    outline-offset: -1px;
  }

  .modal-body {
    flex: 1 1 auto;
    min-block-size: 0;
    padding-block-start: 0.95rem;
    padding-block-end: 0.25rem;
    padding-inline: 3px;
    margin-inline: -3px;
    overflow-x: hidden;
    overflow-y: auto;
    overscroll-behavior: contain;
    scrollbar-width: thin;
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
    font-size: 0.9rem;
    line-height: 1.55;

    > * {
      flex-shrink: 0;
      min-inline-size: 0;
    }

    @media (max-width: 640px) {
      padding-inline-end: 0.35rem;
    }
  }

  .modal-lineage-box {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem 1rem;
    border-radius: 12px;
    background: var(--modal-chip-bg, rgba(255, 255, 255, 0.05));
    border: 1px solid var(--modal-divider, rgba(148, 163, 184, 0.2));
  }

  .modal-lineage-arrow {
    display: inline-grid;
    place-items: center;
    inline-size: 1.75rem;
    block-size: 1.75rem;
    border-radius: 50%;
    flex-shrink: 0;
    font-family: var(--font-mono, ui-monospace, monospace);
    font-size: 0.85rem;
    font-weight: 700;
    line-height: 1;
    background: var(--modal-chip-hover, rgba(52, 211, 153, 0.14));
    border: 1px solid var(--modal-border, rgba(52, 211, 153, 0.3));
    color: var(--modal-accent, #38bdf8);
  }

  @media (max-width: 560px) {
    .modal-lineage-box {
      grid-template-columns: minmax(0, 1fr);
      gap: 0.5rem;
    }

    .modal-lineage-arrow {
      justify-self: start;
      transform: rotate(90deg);
    }
  }

  .modal-spec-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(210px, 100%), 1fr));
    gap: 0.6rem;
  }

  .modal-spec-item {
    padding: 0.65rem 0.8rem;
    border-radius: 10px;
    background: var(--modal-chip-bg, rgba(255, 255, 255, 0.04));
    border: 1px solid var(--modal-divider, rgba(148, 163, 184, 0.16));
    font-size: 0.82rem;
  }

  .modal-spec-item strong {
    display: block;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    opacity: 0.72;
    margin-block-end: 0.2rem;
  }

  .modal-form {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;

    > * {
      flex-shrink: 0;
      min-inline-size: 0;
    }
  }

  .modal-form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(200px, 100%), 1fr));
    gap: 0.75rem;
  }

  .modal-field {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    min-inline-size: 0;
    gap: 0.3rem;
  }

  .modal-field label {
    font-size: 0.78rem;
    font-weight: 600;
  }

  .modal-field :where(input, select, textarea) {
    inline-size: 100%;
    max-inline-size: 100%;
    min-inline-size: 0;
    padding: 0.58rem 0.8rem;
    border-radius: 10px;
    border: 1px solid var(--modal-input-border, var(--modal-divider, rgba(148, 163, 184, 0.36)));
    background: var(--modal-input-bg, rgba(15, 23, 42, 0.55));
    color: inherit;
    font-size: max(1rem, 1em);
    text-overflow: ellipsis;
    transition: border-color 0.16s ease, background-color 0.16s ease;
  }

  .modal-field :where(input, select, textarea):focus-visible {
    border-color: var(--modal-accent, #047857);
    outline: 2px solid var(--modal-accent, #047857);
    outline-offset: -1px;
  }

  .modal-field :where(input, select, textarea):user-invalid {
    border-color: #dc2626;
    outline-color: #dc2626;
  }

  .modal-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: safe center;
    justify-content: flex-end;
    gap: 0.6rem;
    padding-block-start: 0.35rem;

    @media (max-width: 480px) {
      > :is(button, a) {
        flex: 1 1 100%;
        justify-content: center;
        text-align: center;
      }
    }
  }

  .modal-primary-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    padding: 0.55rem 1.05rem;
    border-radius: 999px;
    font-size: 0.84rem;
    font-weight: 700;
    white-space: nowrap;
    flex-shrink: 0;
    background: var(--modal-accent, #0ea5e9);
    color: var(--modal-accent-fg, #04111f);
    transition: filter 0.18s ease;
  }

  .modal-primary-btn:hover:not(:disabled) {
    filter: brightness(1.08);
  }

  .modal-primary-btn:focus-visible {
    outline: 2px solid var(--modal-fg, #0f172a);
    outline-offset: 2px;
  }

  .modal-status-banner {
    padding: 0.7rem 0.9rem;
    border-radius: 10px;
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid rgba(16, 185, 129, 0.42);
    font-size: 0.84rem;
    font-weight: 600;
  }
}

/* ==========================================================================
   LAYER: UTILITIES (Skip link, Visually Hidden, Concept Switcher Pill)
   ========================================================================== */
@layer utilities {
  .visually-hidden:where(:not(:focus-within, :active)) {
    position: absolute !important;
    clip-path: inset(50%) !important;
    overflow: hidden !important;
    inline-size: 1px !important;
    block-size: 1px !important;
    margin: -1px !important;
    padding: 0 !important;
    border: 0 !important;
    white-space: nowrap !important;
  }

  .skip-link:focus-visible {
    position: fixed;
    inset-block-start: 0.75rem;
    inset-inline-start: 0.75rem;
    z-index: 9999;
    padding: 0.55rem 1rem;
    border-radius: 999px;
    background: var(--modal-accent, #0ea5e9);
    color: var(--modal-accent-fg, #020617);
    font-weight: 700;
    font-size: 0.85rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.35);
  }

  /* Compact Concept Switcher Nav Pill integrated into headers */
  .concept-switcher {
    display: inline-flex;
    align-items: safe center;
    gap: 0.2rem;
    padding: 0.18rem;
    border-radius: 999px;
    border: 1px solid var(--switcher-border, rgba(148, 163, 184, 0.26));
    background: var(--switcher-bg, rgba(15, 23, 42, 0.55));
    backdrop-filter: blur(10px);
    font-size: 0.72rem;
  }

  .concept-switcher a {
    display: inline-flex;
    align-items: center;
    gap: 0.28rem;
    padding: 0.26rem 0.58rem;
    border-radius: 999px;
    font-weight: 600;
    white-space: nowrap;
    opacity: 0.78;
    transition: background-color 0.18s ease, color 0.18s ease, opacity 0.18s ease;
  }

  .concept-switcher a:hover {
    opacity: 1;
  }

  .concept-switcher a[aria-current="page"] {
    opacity: 1;
    background: var(--switcher-active-bg, #38bdf8);
    color: var(--switcher-active-fg, #041322);
    font-weight: 700;
  }
}