/* ==========================================================================
   win31.css — Windows 3.1 widget primitives
   Palette is the true 16-colour VGA set. No colour outside it.
   ========================================================================== */

:root {
  --c-black:    #000000;
  --c-gray:     #808080;
  --c-silver:   #c0c0c0;
  --c-white:    #ffffff;
  --c-navy:     #000080;
  --c-teal:     #008080;
  --c-blue:     #0000ff;
  --c-red:      #ff0000;
  --c-maroon:   #800000;
  --c-green:    #008000;
  --c-lime:     #00ff00;
  --c-yellow:   #ffff00;
  --c-olive:    #808000;
  --c-purple:   #800080;
  --c-fuchsia:  #ff00ff;
  --c-aqua:     #00ffff;

  --face:       var(--c-silver);
  --title-h:    18px;
  --font-ui:    "MS Sans Serif", "Microsoft Sans Serif", Tahoma, Geneva, Verdana, sans-serif;
  --font-fixed: "Lucida Console", "Courier New", Courier, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  font-family: var(--font-ui);
  font-size: 12px;
  line-height: 1.25;
  color: var(--c-black);
  -webkit-font-smoothing: none;
  -moz-osx-font-smoothing: grayscale;
  cursor: default;
  -webkit-user-select: none;
  user-select: none;
}

/* --- Bevel primitives ---------------------------------------------------- */
/* Raised: 1px white top/left, 1px black bottom/right, 1px gray inner b/r.    */
.bevel-out {
  border: 1px solid;
  border-color: var(--c-white) var(--c-black) var(--c-black) var(--c-white);
  box-shadow: inset -1px -1px 0 var(--c-gray);
  background: var(--face);
}
/* Pressed / inverted raised */
.bevel-in {
  border: 1px solid;
  border-color: var(--c-black) var(--c-white) var(--c-white) var(--c-black);
  box-shadow: inset 1px 1px 0 var(--c-gray);
  background: var(--face);
}
/* Sunken well: for text fields, list boxes, client areas */
.bevel-well {
  border: 1px solid;
  border-color: var(--c-gray) var(--c-white) var(--c-white) var(--c-gray);
  box-shadow: inset 1px 1px 0 var(--c-black);
  background: var(--c-white);
}
/* Thin engraved separator line */
.rule {
  height: 2px;
  border-top: 1px solid var(--c-gray);
  border-bottom: 1px solid var(--c-white);
  margin: 4px 0;
}

/* --- Buttons ------------------------------------------------------------- */
.btn {
  font: inherit;
  min-width: 74px;
  height: 23px;
  padding: 0 10px;
  background: var(--face);
  color: var(--c-black);
  border: 1px solid;
  border-color: var(--c-white) var(--c-black) var(--c-black) var(--c-white);
  box-shadow: inset -1px -1px 0 var(--c-gray);
  position: relative;
  cursor: default;
  white-space: nowrap;
}
.btn:active:not(:disabled),
.btn.is-pressed {
  border-color: var(--c-black) var(--c-white) var(--c-white) var(--c-black);
  box-shadow: inset 1px 1px 0 var(--c-gray);
  padding: 1px 9px 0 11px;
}
.btn:disabled {
  color: var(--c-gray);
  text-shadow: 1px 1px 0 var(--c-white);
}
/* Default button: extra black ring, as 3.1 drew it */
.btn.is-default { outline: 1px solid var(--c-black); outline-offset: 1px; }
.btn:focus-visible { outline: 1px dotted var(--c-black); outline-offset: -4px; }

/* --- Text inputs --------------------------------------------------------- */
.field {
  font: inherit;
  height: 21px;
  padding: 2px 3px;
  background: var(--c-white);
  color: var(--c-black);
  border: 1px solid;
  border-color: var(--c-gray) var(--c-white) var(--c-white) var(--c-gray);
  box-shadow: inset 1px 1px 0 var(--c-black);
  outline: none;
  -webkit-user-select: text;
  user-select: text;
}
textarea.field { height: auto; resize: none; font-family: var(--font-ui); }

/* --- Checkbox / radio ---------------------------------------------------- */
.check { display: flex; align-items: center; gap: 6px; }
.check input { position: absolute; opacity: 0; pointer-events: none; }
.check .box {
  width: 13px; height: 13px; flex: none;
  background: var(--c-white);
  border: 1px solid;
  border-color: var(--c-gray) var(--c-white) var(--c-white) var(--c-gray);
  box-shadow: inset 1px 1px 0 var(--c-black);
  display: grid; place-items: center;
  font-size: 10px; line-height: 1; color: var(--c-black);
}
.check input:checked + .box::after { content: "\2713"; font-weight: bold; }

/* --- Title bar ----------------------------------------------------------- */
.titlebar {
  height: var(--title-h);
  display: flex;
  align-items: center;
  padding: 0 2px;
  background: var(--c-navy);
  color: var(--c-white);
  font-weight: bold;
  flex: none;
}
.win.is-inactive > .titlebar,
.group-window.is-inactive > .titlebar {
  background: var(--c-white);
  color: var(--c-black);
}
.titlebar .caption {
  flex: 1;
  text-align: center;          /* 3.1 centred captions — 95 moved them left */
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  padding: 0 4px;
  pointer-events: none;
}

/* Title-bar boxes: system menu (left), minimise/maximise (right) */
.tbtn {
  width: 16px; height: 14px;
  flex: none;
  background: var(--face);
  border: 1px solid;
  border-color: var(--c-white) var(--c-black) var(--c-black) var(--c-white);
  box-shadow: inset -1px -1px 0 var(--c-gray);
  display: grid; place-items: center;
  padding: 0;
}
.tbtn:active {
  border-color: var(--c-black) var(--c-white) var(--c-white) var(--c-black);
  box-shadow: inset 1px 1px 0 var(--c-gray);
}
.tbtn + .tbtn { margin-left: 2px; }
/* System menu glyph: a wide horizontal bar in a box */
.tbtn.sys::after {
  content: ""; width: 9px; height: 2px;
  background: var(--c-black);
  border-top: 1px solid var(--c-black);
}
/* Minimise: solid down triangle. Maximise: solid up triangle. */
.tbtn.min::after,
.tbtn.max::after,
.tbtn.restore::after {
  content: ""; width: 0; height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
}
.tbtn.min::after     { border-top: 4px solid var(--c-black); margin-top: 3px; }
.tbtn.max::after     { border-bottom: 4px solid var(--c-black); margin-bottom: 3px; }
.tbtn.restore::after { border-bottom: 4px solid var(--c-black); margin-bottom: 3px; opacity: .999; }

/* --- Menu bar ------------------------------------------------------------ */
.menubar {
  display: flex;
  align-items: stretch;
  height: 19px;
  background: var(--face);
  border-bottom: 1px solid var(--c-gray);
  flex: none;
  position: relative;
  z-index: 5;
}
.menubar > .menu-item {
  padding: 2px 8px 0;
  display: flex; align-items: center;
  white-space: nowrap;
}
.menubar > .menu-item.is-open { background: var(--c-navy); color: var(--c-white); }
.menu-item .hot { text-decoration: underline; }

.menu-pop {
  position: absolute;
  top: 100%; left: 0;
  min-width: 150px;
  padding: 2px;
  background: var(--face);
  border: 1px solid;
  border-color: var(--c-white) var(--c-black) var(--c-black) var(--c-white);
  box-shadow: inset -1px -1px 0 var(--c-gray), 2px 2px 0 rgba(0,0,0,.35);
  z-index: 10;
}
.menu-pop .row {
  display: flex; align-items: center; gap: 16px;
  padding: 2px 18px 2px 20px;
  white-space: nowrap;
}
.menu-pop .row .accel { margin-left: auto; color: inherit; }
.menu-pop .row:not(.is-disabled):hover { background: var(--c-navy); color: var(--c-white); }
.menu-pop .row.is-disabled { color: var(--c-gray); text-shadow: 1px 1px 0 var(--c-white); }
.menu-pop .row.is-checked::before { content: "\2713"; position: absolute; margin-left: -14px; }
.menu-pop .sep { height: 2px; margin: 3px 1px; border-top: 1px solid var(--c-gray); border-bottom: 1px solid var(--c-white); }

/* --- Scrollbars (dithered track, 3.1 style) ------------------------------ */
.scroll {
  overflow: auto;
  scrollbar-width: auto;
  scrollbar-color: var(--c-silver) var(--c-white);
}
.scroll::-webkit-scrollbar { width: 16px; height: 16px; }
.scroll::-webkit-scrollbar-track {
  background-color: var(--c-silver);
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='2' height='2'><rect width='2' height='2' fill='%23c0c0c0'/><rect width='1' height='1' fill='%23ffffff'/><rect x='1' y='1' width='1' height='1' fill='%23ffffff'/></svg>");
  background-size: 2px 2px;
}
.scroll::-webkit-scrollbar-thumb {
  background: var(--c-silver);
  border: 1px solid;
  border-color: var(--c-white) var(--c-black) var(--c-black) var(--c-white);
  box-shadow: inset -1px -1px 0 var(--c-gray);
}
.scroll::-webkit-scrollbar-corner { background: var(--c-silver); }
.scroll::-webkit-scrollbar-button:single-button {
  background-color: var(--c-silver);
  border: 1px solid;
  border-color: var(--c-white) var(--c-black) var(--c-black) var(--c-white);
  box-shadow: inset -1px -1px 0 var(--c-gray);
  display: block;
  height: 16px; width: 16px;
  background-repeat: no-repeat;
  background-position: center center;
}
.scroll::-webkit-scrollbar-button:single-button:vertical:decrement {
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='7' height='4'><polygon points='3.5,0 7,4 0,4' fill='%23000000'/></svg>");
}
.scroll::-webkit-scrollbar-button:single-button:vertical:increment {
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='7' height='4'><polygon points='0,0 7,0 3.5,4' fill='%23000000'/></svg>");
}
.scroll::-webkit-scrollbar-button:single-button:horizontal:decrement {
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='4' height='7'><polygon points='0,3.5 4,0 4,7' fill='%23000000'/></svg>");
}
.scroll::-webkit-scrollbar-button:single-button:horizontal:increment {
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='4' height='7'><polygon points='0,0 4,3.5 0,7' fill='%23000000'/></svg>");
}

/* --- Group box ----------------------------------------------------------- */
.groupbox {
  border: 1px solid var(--c-gray);
  border-right-color: var(--c-white);
  border-bottom-color: var(--c-white);
  padding: 10px 10px 8px;
  margin: 12px 0 0;
  position: relative;
}
.groupbox > legend { padding: 0 4px; }

/* --- Status bar ---------------------------------------------------------- */
.statusbar {
  height: 20px;
  flex: none;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 2px;
  background: var(--face);
  border-top: 1px solid var(--c-white);
}
.statusbar .cell {
  padding: 1px 6px;
  height: 100%;
  display: flex; align-items: center;
  border: 1px solid;
  border-color: var(--c-gray) var(--c-white) var(--c-white) var(--c-gray);
  box-shadow: inset 1px 1px 0 rgba(0,0,0,.15);
}
.statusbar .cell.grow { flex: 1; }