:root {
  --bg: #141311;
  --ink: #f6f3ec;
  --muted: rgba(246, 243, 236, 0.6);
}

* { box-sizing: border-box; margin: 0; }

html,
body {
  height: 100%;
  overflow: hidden;
  overscroll-behavior: none;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: "Open Sans", ui-sans-serif, system-ui, sans-serif;
}

.nsc-zoom {
  position: relative;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  touch-action: none;
  user-select: none;

  .stage {
    position: absolute;
    inset: 0;
  }

  /* Every frame is a full-viewport picture scaled down around the center; the next one sits inside it at 1 / ratio. */
  .frame {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    transform-origin: 50% 50%;
    will-change: transform, opacity;
    /* Feathered edges, so each picture melts into the one around it instead of sitting in a hard box.
       --feather is set on .nsc-zoom by the settings panel. */
    mask-image:
      linear-gradient(to right, transparent, #000 var(--feather, 14%), #000 calc(100% - var(--feather, 14%)), transparent),
      linear-gradient(to bottom, transparent, #000 var(--feather, 14%), #000 calc(100% - var(--feather, 14%)), transparent);
    mask-composite: intersect;
  }

  /* Settings panel, drawn like the collection's other tools (type / move-resize kits): white face, 2px ink
     edge, one solid black titlebar, a hatched offset shadow instead of a blur, mono caps, square controls. */
  .panel {
    --p-bg: #ffffff;
    --p-ink: #000000;
    --p-muted: #6b6b6b;
    --p-faint: #d4d4d4;
    --p-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 100;
    display: flex;
    flex-direction: column;
    width: 320px;
    max-height: calc(100% - 50px);
    background: var(--p-bg);
    color: var(--p-ink);
    border: 2px solid var(--p-ink);
    font-family: var(--p-mono);
    font-size: 11px;
    line-height: 1.4;
    -webkit-font-smoothing: antialiased;
    user-select: none;

    /* The lift: an L of hatch outside the border box, down the right edge and along the bottom. */
    &::before,
    &::after {
      content: "";
      position: absolute;
      pointer-events: none;
      background: url("patterns/diagonal.svg") repeat;
      background-size: 5px 5px;
    }
    &::before { top: 10px; bottom: -10px; right: -12px; width: 10px; }
    &::after { left: 10px; right: -12px; bottom: -12px; height: 10px; }

    /* Minimized: not a fade in place - it shrinks along a vector into .panel-show (--dock-x/y are measured by
       script.js when it goes), and grows back out of it on the same curve. visibility goes on a delay so a hidden
       window also leaves the tab order. */
    --dock-x: 0px;
    --dock-y: 0px;
    transition: opacity 0.2s ease, transform 0.24s cubic-bezier(0.33, 0, 0.2, 1);

    &.is-minimized {
      opacity: 0;
      transform: translate(var(--dock-x), var(--dock-y)) scale(0.12);
      pointer-events: none;
      visibility: hidden;
      transition: opacity 0.2s ease, transform 0.24s cubic-bezier(0.33, 0, 0.2, 1), visibility 0s linear 0.24s;
    }

    :focus-visible { outline: 2px solid var(--p-ink); outline-offset: 2px; }
  }

  /* The way back: a solid ink tab bottom right, shown only while the panel is minimized. */
  .panel-show {
    position: absolute;
    right: 14px;
    bottom: 14px;
    z-index: 100;
    height: 26px;
    padding: 0 12px;
    font-family: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: #ffffff;
    background: #000000;
    border: 1px solid #000000;
    border-radius: 0;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.15s ease, background-color 0.12s ease, color 0.12s ease;

    &.is-visible { opacity: 1; visibility: visible; transition-delay: 0.18s, 0s, 0s; }
    &:hover { background: #ffffff; color: #000000; }
  }

  .panel-head {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 48px;
    padding: 0 12px;
    background: var(--p-ink);
    color: var(--p-bg);
  }

  .panel-title {
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.2em;
    text-transform: uppercase;
  }

  .panel-body {
    flex: 1 1 auto;
    min-height: 0;
    overflow: hidden auto;
    overscroll-behavior: contain;
    scrollbar-width: thin;
    scrollbar-color: var(--p-faint) transparent;
  }

  /* Section headers run the full width with an ink rule above, like the kits' groups. */
  .group {
    margin: 0;
    padding: 12px 14px 6px;
    border-top: 1px solid var(--p-ink);
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;

    &:first-child { border-top: 0; }
  }

  .param,
  .check {
    display: flex;
    align-items: center;
    gap: 10px;
    min-height: 22px;
    margin: 4px 14px;
  }

  .param-name {
    flex: 0 0 96px;
    color: var(--p-muted);
  }

  .param select {
    flex: 1 1 auto;
    min-width: 0;
    height: 22px;
    padding: 0 6px;
    font: inherit;
    color: var(--p-ink);
    background: var(--p-bg);
    border: 1px solid var(--p-ink);
    border-radius: 0;
    cursor: pointer;
  }

  .param input[type="color"] {
    flex: 1 1 auto;
    height: 22px;
    padding: 0;
    border: 1px solid var(--p-ink);
    border-radius: 0;
    background: var(--p-bg);
    cursor: pointer;
  }

  .param output {
    flex: 0 0 auto;
    min-width: 52px;
    text-align: right;
    font-variant-numeric: tabular-nums;
    font-weight: 500;
  }

  /* Hairline track, square ink thumb that grows a step under the pointer. */
  .param input[type="range"] {
    flex: 1 1 auto;
    min-width: 0;
    height: 18px;
    appearance: none;
    background: transparent;
    cursor: pointer;

    &::-webkit-slider-runnable-track { height: 1px; background: var(--p-ink); }
    &::-webkit-slider-thumb { appearance: none; width: 8px; height: 14px; margin-top: -6.5px; background: var(--p-ink); border: 0; border-radius: 0; cursor: grab; }
    &:hover::-webkit-slider-thumb { width: 10px; height: 16px; margin-top: -7.5px; }
    &::-moz-range-track { height: 1px; background: var(--p-ink); }
    &::-moz-range-thumb { width: 8px; height: 14px; background: var(--p-ink); border: 0; border-radius: 0; cursor: grab; }
    &:hover::-moz-range-thumb { width: 10px; height: 16px; }
  }

  .check {
    margin-top: 8px;
    cursor: pointer;

    input { accent-color: var(--p-ink); margin: 0; }
  }

  /* Buttons: outlined at rest, inverted under the pointer. In the titlebar they are drawn in reverse. */
  .panel-toggle,
  .action {
    height: 22px;
    padding: 0 10px;
    font-family: var(--p-mono);
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    background: var(--p-bg);
    color: var(--p-ink);
    border: 1px solid var(--p-ink);
    border-radius: 0;
    cursor: pointer;
    transition: background-color 0.12s ease, color 0.12s ease;

    &:hover { background: var(--p-ink); color: var(--p-bg); }
    &:active { background: var(--p-muted); border-color: var(--p-muted); color: var(--p-bg); }
  }

  .panel-toggle {
    width: 30px;
    height: 30px;
    padding: 0;
    font-size: 14px;
    background: transparent;
    color: var(--p-bg);
    border: 2px solid var(--p-bg);

    &:hover { background: var(--p-bg); color: var(--p-ink); }
    &:focus-visible { outline-color: var(--p-bg); }
  }

  /* Photos: the loop in order, one row each - a small thumbnail, the name, and remove. */
  .photos {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin: 4px 14px 0;
    padding: 0;
    list-style: none;

    li {
      display: grid;
      grid-template-columns: 24px minmax(0, 1fr) 16px;
      align-items: center;
      gap: 8px;
      padding: 0 4px 0 0; /* the thumbnail runs right up to the border */
      border: 1px solid var(--p-faint);
      background: var(--p-bg);
      cursor: grab;
      transition: border-color 0.12s ease;

      &:hover { border-color: var(--p-ink); }
      /* lifted out while dragged; the placeholder row stands in for it */
      &.is-dragging { display: none; }
    }

    /* where the dragged row will land */
    .placeholder {
      display: block;
      border: 1px dashed var(--p-ink);
      background: repeating-linear-gradient(45deg, transparent 0 4px, rgba(0, 0, 0, 0.06) 4px 8px);
      cursor: grabbing;
    }

    img {
      width: 24px;
      height: 24px;
      object-fit: cover;
      display: block;
      pointer-events: none;
    }

    span {
      overflow: hidden;
      font-size: 11px;
      text-overflow: ellipsis;
      white-space: nowrap;
      pointer-events: none;
    }

    .remove {
      width: 16px;
      height: 16px;
      padding: 0;
      font: 400 12px/1 var(--p-mono);
      color: var(--p-ink);
      background: var(--p-bg);
      border: 1px solid var(--p-ink);
      border-radius: 0;
      cursor: pointer;
      opacity: 0;
      transition: opacity 0.12s ease;

      &:hover { background: var(--p-ink); color: var(--p-bg); }
      &:disabled { visibility: hidden; }
    }

    li:hover .remove,
    .remove:focus-visible { opacity: 1; }

    /* image files being dragged in from the desktop */
    &.is-dropping { outline: 2px dashed var(--p-ink); outline-offset: 3px; }
  }

  .photo-actions {
    display: flex;
    gap: 8px;
    padding: 8px 14px 0;
  }

  .add-photos {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .actions {
    display: flex;
    gap: 8px;
    margin-top: 12px;
    padding: 12px 14px 14px;
    border-top: 1px solid var(--p-ink);
  }

  .action { flex: 1; }

  .caption {
    position: absolute;
    left: 0;
    right: 0;
    bottom: var(--title-bottom, 28px);
    z-index: 50;
    padding: 0 16px;
    text-align: center;
    pointer-events: none;
  }

  /* Small, light and widely tracked: a quiet label rather than a headline. The --title-* values are set by the panel. */
  /* inline-block so the plate wraps the word rather than the full width; the caption row centers it. */
  .season {
    display: inline-block;
    font-family: var(--title-font, "Montserrat"), ui-sans-serif, system-ui, sans-serif;
    font-weight: var(--title-weight, 300);
    font-size: var(--title-size, 16px);
    line-height: 1;
    letter-spacing: var(--title-tracking, 0.42em);
    text-transform: uppercase;
    text-shadow: 0 1px var(--shadow-blur, 12px) rgba(0, 0, 0, var(--shadow-opacity, 0.5));
    /* The plate: a tinted box behind the word, see-through by --plate-opacity, optionally frosting what's behind. */
    padding: calc(var(--plate-padding, 0px) * 0.6) var(--plate-padding, 0px);
    /* tracking adds space after the last letter too; matching it on the left keeps the word truly centered */
    padding-left: calc(var(--plate-padding, 0px) + var(--title-tracking, 0.42em));
    border-radius: var(--plate-radius, 0px);
    background: color-mix(in srgb, var(--plate-color, #000) calc(var(--plate-opacity, 0) * 100%), transparent);
    backdrop-filter: blur(var(--plate-blur, 0px));
  }
}