/* CSS is how you can add style to your website, such as colors, fonts, and positioning of your
   HTML content. To learn how to do something, just try searching Google for questions like
   "how to change link color." */

/* ============================================================
   styles.css — Windows 95 / React95 aesthetic in pure CSS
   No framework required. Add class names to your HTML elements.
   ============================================================ */

/* ── Custom Properties ─────────────────────────────────────── */
:root {
  /* System palette */
  --color-bg:               #c0c0c0;
  --color-surface:          #c0c0c0;
  --color-surface-dark:     #808080;
  --color-surface-darker:   #404040;
  --color-white:            #ffffff;
  --color-black:            #000000;

  /* Title bar */
  --color-titlebar-start:   #000080;
  --color-titlebar-end:     #1084d0;
  --color-titlebar-text:    #ffffff;
  --color-titlebar-inactive:#808080;

  /* Highlights & shadows for 3-D borders */
  --color-highlight:        #ffffff;
  --color-highlight-dark:   #dfdfdf;
  --color-shadow:           #808080;
  --color-shadow-dark:      #404040;

  /* Text */
  --color-text:             #000000;
  --color-text-disabled:    #808080;
  --color-text-shadow:      #ffffff;

  /* Selection / focus */
  --color-selection-bg:     #000080;
  --color-selection-text:   #ffffff;

  /* Scrollbar */
  --scrollbar-width:        17px;

  /* Fonts */
  --font-system:            "Pixelated MS Sans Serif", "MS Sans Serif", Arial, sans-serif;
  --font-mono:              "Perfect DOS VGA 437", "Courier New", monospace;
  --font-size-base:         11px;
  --font-size-sm:           10px;
  --font-size-title:        12px;

  /* Spacing */
  --space-xs:  2px;
  --space-sm:  4px;
  --space-md:  8px;
  --space-lg: 12px;
  --space-xl: 16px;
}

/* ── Reset & Base ───────────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--font-size-base);
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-system);
  image-rendering: pixelated;
  -webkit-font-smoothing: none;
  font-smooth: never;
}

body {
  background-color: #008080; /* classic teal desktop */
  min-height: 100vh;
  font-family: var(--font-system);
  font-size: var(--font-size-base);
}

/* ── 3-D Border Mixins (utility classes) ────────────────────── */

/* Raised — sits "above" the surface */
.raised {
  border-style: solid;
  border-width: 2px;
  border-color:
    var(--color-highlight)
    var(--color-shadow-dark)
    var(--color-shadow-dark)
    var(--color-highlight);
  box-shadow:
    inset  1px  1px 0 var(--color-highlight-dark),
    inset -1px -1px 0 var(--color-shadow);
}

/* Sunken — pressed into the surface */
.sunken {
  border-style: solid;
  border-width: 2px;
  border-color:
    var(--color-shadow-dark)
    var(--color-highlight)
    var(--color-highlight)
    var(--color-shadow-dark);
  box-shadow:
    inset  1px  1px 0 var(--color-shadow),
    inset -1px -1px 0 var(--color-highlight-dark);
}

/* Flat etched border (groupbox style) */
.etched {
  border-style: solid;
  border-width: 2px;
  border-color:
    var(--color-shadow)
    var(--color-highlight)
    var(--color-highlight)
    var(--color-shadow);
}

/* ── Window ─────────────────────────────────────────────────── */
.window {
  display: flex;
  flex-direction: column;
  background-color: var(--color-surface);
  padding: 2px;
  border-style: solid;
  border-width: 2px;
  border-color:
    var(--color-highlight)
    var(--color-shadow-dark)
    var(--color-shadow-dark)
    var(--color-highlight);
  box-shadow:
    inset  1px  1px 0 var(--color-highlight-dark),
    inset -1px -1px 0 var(--color-shadow);
  min-width: 200px;
}

/* ── Title Bar ──────────────────────────────────────────────── */
.title-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: linear-gradient(
    to right,
    var(--color-titlebar-start),
    var(--color-titlebar-end)
  );
  color: var(--color-titlebar-text);
  font-size: var(--font-size-title);
  font-weight: bold;
  padding: 3px 4px 3px 6px;
  gap: var(--space-sm);
  user-select: none;
  cursor: default;
}

.title-bar--inactive {
  background: var(--color-titlebar-inactive);
}

.title-bar__title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex: 1;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.title-bar__icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.title-bar__controls {
  display: flex;
  gap: 2px;
  flex-shrink: 0;
}

/* Title bar buttons (minimize / maximize / close) */
.title-bar-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 14px;
  background-color: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font-system);
  font-size: 9px;
  font-weight: bold;
  cursor: pointer;
  border-style: solid;
  border-width: 2px;
  border-color:
    var(--color-highlight)
    var(--color-shadow-dark)
    var(--color-shadow-dark)
    var(--color-highlight);
  box-shadow:
    inset  1px  1px 0 var(--color-highlight-dark),
    inset -1px -1px 0 var(--color-shadow);
  user-select: none;
  line-height: 1;
}

.title-bar-btn:active {
  border-color:
    var(--color-shadow-dark)
    var(--color-highlight)
    var(--color-highlight)
    var(--color-shadow-dark);
  box-shadow:
    inset  1px  1px 0 var(--color-shadow),
    inset -1px -1px 0 var(--color-highlight-dark);
  padding-top: 1px;
  padding-left: 1px;
}

/* ── Window Body ────────────────────────────────────────────── */
.window-body {
  padding: var(--space-md);
  background-color: var(--color-surface);
  flex: 1;
}

/* ── Menu Bar ───────────────────────────────────────────────── */
.menu-bar {
  display: flex;
  align-items: stretch;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-shadow);
  font-size: var(--font-size-base);
  user-select: none;
}

.menu-bar__item {
  display: flex;
  align-items: center;
  padding: 3px 8px;
  cursor: default;
  position: relative;
  white-space: nowrap;
}

.menu-bar__item:hover,
.menu-bar__item--open {
  background-color: var(--color-selection-bg);
  color: var(--color-selection-text);
}

/* Underline access key */
.menu-bar__item u,
.menu__item u {
  text-decoration: underline;
}

/* Dropdown menu */
.menu {
  position: absolute;
  top: 100%;
  left: 0;
  z-index: 1000;
  background-color: var(--color-surface);
  min-width: 160px;
  border-style: solid;
  border-width: 2px;
  border-color:
    var(--color-highlight)
    var(--color-shadow-dark)
    var(--color-shadow-dark)
    var(--color-highlight);
  box-shadow:
    inset  1px  1px 0 var(--color-highlight-dark),
    inset -1px -1px 0 var(--color-shadow);
  padding: 2px 0;
}

.menu__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 20px 4px 24px;
  cursor: default;
  white-space: nowrap;
  font-size: var(--font-size-base);
  gap: var(--space-xl);
}

.menu__item:hover {
  background-color: var(--color-selection-bg);
  color: var(--color-selection-text);
}

.menu__item--disabled {
  color: var(--color-text-disabled);
  pointer-events: none;
}

.menu__item--disabled:hover {
  background-color: transparent;
  color: var(--color-text-disabled);
}

.menu__separator {
  height: 1px;
  margin: 4px 2px;
  border-top: 1px solid var(--color-shadow);
  border-bottom: 1px solid var(--color-highlight);
}

.menu__item-shortcut {
  color: var(--color-text-disabled);
  font-size: var(--font-size-sm);
}

.menu__item--checked::before {
  content: "✓";
  position: absolute;
  left: 8px;
}

/* ── Toolbar ────────────────────────────────────────────────── */
.toolbar {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 2px 4px;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-shadow);
}

.toolbar__separator {
  width: 2px;
  height: 22px;
  margin: 0 2px;
  border-left: 1px solid var(--color-shadow);
  border-right: 1px solid var(--color-highlight);
}

/* ── Buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  min-width: 75px;
  padding: 4px 10px;
  background-color: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font-system);
  font-size: var(--font-size-base);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  border-style: solid;
  border-width: 2px;
  border-color:
    var(--color-highlight)
    var(--color-shadow-dark)
    var(--color-shadow-dark)
    var(--color-highlight);
  box-shadow:
    inset  1px  1px 0 var(--color-highlight-dark),
    inset -1px -1px 0 var(--color-shadow);
  outline: none;
  position: relative;
}

.btn:active:not(:disabled),
.btn--active {
  border-color:
    var(--color-shadow-dark)
    var(--color-highlight)
    var(--color-highlight)
    var(--color-shadow-dark);
  box-shadow:
    inset  1px  1px 0 var(--color-shadow),
    inset -1px -1px 0 var(--color-highlight-dark);
  padding-top: 5px;
  padding-left: 11px;
}

.btn:focus-visible::after {
  content: "";
  position: absolute;
  inset: 3px;
  border: 1px dotted var(--color-black);
  pointer-events: none;
}

.btn--default {
  /* Default button gets extra outer border */
  border-color:
    var(--color-black)
    var(--color-black)
    var(--color-black)
    var(--color-black);
  box-shadow:
    inset  1px  1px 0 var(--color-highlight),
    inset -1px -1px 0 var(--color-shadow-dark),
    inset  2px  2px 0 var(--color-highlight-dark),
    inset -2px -2px 0 var(--color-shadow);
  padding: 4px 10px;
}

.btn:disabled,
.btn--disabled {
  color: var(--color-text-disabled);
  text-shadow: 1px 1px 0 var(--color-highlight);
  cursor: not-allowed;
  pointer-events: none;
}

/* Small icon-sized toolbar button */
.btn--toolbar {
  min-width: 0;
  width: 24px;
  height: 24px;
  padding: 2px;
}

/* Flat toolbar button (only raised on hover) */
.btn--flat {
  border-color: transparent;
  box-shadow: none;
}
.btn--flat:hover {
  border-color:
    var(--color-highlight)
    var(--color-shadow-dark)
    var(--color-shadow-dark)
    var(--color-highlight);
  box-shadow:
    inset  1px  1px 0 var(--color-highlight-dark),
    inset -1px -1px 0 var(--color-shadow);
}

/* ── Input / Textarea ───────────────────────────────────────── */
.input,
input[type="text"],
input[type="password"],
input[type="number"],
input[type="email"],
input[type="search"],
input[type="url"],
input[type="tel"],
textarea {
  background-color: var(--color-white);
  color: var(--color-text);
  font-family: var(--font-system);
  font-size: var(--font-size-base);
  padding: 3px 4px;
  outline: none;
  border-style: solid;
  border-width: 2px;
  border-color:
    var(--color-shadow-dark)
    var(--color-highlight)
    var(--color-highlight)
    var(--color-shadow-dark);
  box-shadow:
    inset  1px  1px 0 var(--color-shadow),
    inset -1px -1px 0 var(--color-highlight-dark);
  width: 100%;
}

.input:disabled,
input:disabled,
textarea:disabled {
  background-color: var(--color-surface);
  color: var(--color-text-disabled);
  cursor: not-allowed;
}

.input::selection,
input::selection,
textarea::selection {
  background-color: var(--color-selection-bg);
  color: var(--color-selection-text);
}

textarea {
  resize: vertical;
  min-height: 80px;
}

/* ── Checkbox ───────────────────────────────────────────────── */
.checkbox {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
  user-select: none;
  font-size: var(--font-size-base);
}

.checkbox__input {
  appearance: none;
  -webkit-appearance: none;
  width: 13px;
  height: 13px;
  flex-shrink: 0;
  background-color: var(--color-white);
  border-style: solid;
  border-width: 2px;
  border-color:
    var(--color-shadow-dark)
    var(--color-highlight)
    var(--color-highlight)
    var(--color-shadow-dark);
  box-shadow:
    inset  1px  1px 0 var(--color-shadow),
    inset -1px -1px 0 var(--color-highlight-dark);
  cursor: pointer;
  position: relative;
  outline: none;
}

.checkbox__input:checked::after {
  content: "";
  position: absolute;
  inset: 1px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 9 9'%3E%3Cpath d='M1 5l2 3 5-7' stroke='%23000' stroke-width='1.5' fill='none' stroke-linecap='square'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
}

.checkbox__input:disabled {
  background-color: var(--color-surface);
  cursor: not-allowed;
}

.checkbox--disabled {
  color: var(--color-text-disabled);
  cursor: not-allowed;
}

/* ── Radio Button ───────────────────────────────────────────── */
.radio {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
  user-select: none;
  font-size: var(--font-size-base);
}

.radio__input {
  appearance: none;
  -webkit-appearance: none;
  width: 13px;
  height: 13px;
  flex-shrink: 0;
  background-color: var(--color-white);
  border-radius: 50%;
  border-style: solid;
  border-width: 2px;
  border-color:
    var(--color-shadow-dark)
    var(--color-highlight)
    var(--color-highlight)
    var(--color-shadow-dark);
  box-shadow:
    inset  1px  1px 0 var(--color-shadow),
    inset -1px -1px 0 var(--color-highlight-dark);
  cursor: pointer;
  position: relative;
  outline: none;
}

.radio__input:checked::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--color-black);
}

.radio__input:disabled {
  background-color: var(--color-surface);
  cursor: not-allowed;
}

/* ── Select / Dropdown ──────────────────────────────────────── */
.select,
select {
  appearance: none;
  -webkit-appearance: none;
  background-color: var(--color-white);
  color: var(--color-text);
  font-family: var(--font-system);
  font-size: var(--font-size-base);
  padding: 3px 24px 3px 4px;
  cursor: pointer;
  outline: none;
  border-style: solid;
  border-width: 2px;
  border-color:
    var(--color-shadow-dark)
    var(--color-highlight)
    var(--color-highlight)
    var(--color-shadow-dark);
  box-shadow:
    inset  1px  1px 0 var(--color-shadow),
    inset -1px -1px 0 var(--color-highlight-dark);
  width: 100%;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='17' height='100%25'%3E%3Crect width='17' height='100%25' fill='%23c0c0c0'/%3E%3Crect x='0' y='0' width='2' height='100%25' fill='%23ffffff'/%3E%3Cpolygon points='4,6 13,6 8.5,11' fill='%23000000'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0 center;
}

/* ── List Box ───────────────────────────────────────────────── */
.listbox {
  background-color: var(--color-white);
  font-size: var(--font-size-base);
  font-family: var(--font-system);
  overflow-y: auto;
  border-style: solid;
  border-width: 2px;
  border-color:
    var(--color-shadow-dark)
    var(--color-highlight)
    var(--color-highlight)
    var(--color-shadow-dark);
  box-shadow:
    inset  1px  1px 0 var(--color-shadow),
    inset -1px -1px 0 var(--color-highlight-dark);
  padding: 1px;
}

.listbox__item {
  display: block;
  padding: 2px 4px;
  cursor: default;
  user-select: none;
  white-space: nowrap;
}

.listbox__item--selected {
  background-color: var(--color-selection-bg);
  color: var(--color-selection-text);
}

.listbox__item:hover:not(.listbox__item--selected) {
  background-color: var(--color-highlight-dark);
}

/* ── Progress Bar ───────────────────────────────────────────── */
.progress-bar {
  border-style: solid;
  border-width: 2px;
  border-color:
    var(--color-shadow-dark)
    var(--color-highlight)
    var(--color-highlight)
    var(--color-shadow-dark);
  box-shadow:
    inset  1px  1px 0 var(--color-shadow),
    inset -1px -1px 0 var(--color-highlight-dark);
  background-color: var(--color-surface);
  height: 20px;
  padding: 2px;
  position: relative;
  overflow: hidden;
}

.progress-bar__fill {
  height: 100%;
  background-color: var(--color-selection-bg);
  background-image: repeating-linear-gradient(
    90deg,
    var(--color-selection-bg) 0px,
    var(--color-selection-bg) 14px,
    var(--color-surface)      14px,
    var(--color-surface)      16px
  );
  transition: width 0.1s step-end;
}

/* ── Slider / Range ─────────────────────────────────────────── */
.slider,
input[type="range"] {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  height: 30px;
  background: transparent;
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 4px;
  background-color: var(--color-shadow-dark);
  border-top: 1px solid var(--color-shadow-dark);
  border-bottom: 1px solid var(--color-highlight);
  border-left: 1px solid var(--color-shadow-dark);
  border-right: 1px solid var(--color-highlight);
}

input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 12px;
  height: 22px;
  margin-top: -9px;
  background-color: var(--color-surface);
  border-style: solid;
  border-width: 2px;
  border-color:
    var(--color-highlight)
    var(--color-shadow-dark)
    var(--color-shadow-dark)
    var(--color-highlight);
  box-shadow:
    inset  1px  1px 0 var(--color-highlight-dark),
    inset -1px -1px 0 var(--color-shadow);
}

input[type="range"]::-moz-range-track {
  height: 4px;
  background-color: var(--color-shadow-dark);
  border: 1px solid var(--color-shadow);
}

input[type="range"]::-moz-range-thumb {
  appearance: none;
  width: 12px;
  height: 22px;
  background-color: var(--color-surface);
  border-style: solid;
  border-width: 2px;
  border-color:
    var(--color-highlight)
    var(--color-shadow-dark)
    var(--color-shadow-dark)
    var(--color-highlight);
  border-radius: 0;
}

/* ── Group Box ──────────────────────────────────────────────── */
.group-box {
  border-style: solid;
  border-width: 2px;
  border-color:
    var(--color-shadow)
    var(--color-highlight)
    var(--color-highlight)
    var(--color-shadow);
  padding: var(--space-xl) var(--space-md) var(--space-md);
  position: relative;
  margin-top: var(--space-md);
}

.group-box__legend {
  position: absolute;
  top: -0.7em;
  left: var(--space-md);
  background-color: var(--color-surface);
  padding: 0 4px;
  font-size: var(--font-size-base);
  font-weight: normal;
  line-height: 1.2;
}

/* ── Status Bar ─────────────────────────────────────────────── */
.status-bar {
  display: flex;
  align-items: stretch;
  gap: 2px;
  padding: 2px 4px;
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-shadow);
  font-size: var(--font-size-base);
}

.status-bar__panel {
  flex: 1;
  padding: 2px 4px;
  border-style: solid;
  border-width: 1px;
  border-color:
    var(--color-shadow-dark)
    var(--color-highlight)
    var(--color-highlight)
    var(--color-shadow-dark);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.status-bar__panel--fixed {
  flex: none;
}

/* Resize grip */
.status-bar__grip {
  width: 16px;
  height: 16px;
  align-self: flex-end;
  flex-shrink: 0;
  background-image:
    repeating-linear-gradient(
      -45deg,
      var(--color-shadow-dark) 0px,
      var(--color-shadow-dark) 1px,
      transparent 1px,
      transparent 3px
    );
}

/* ── Tabs ───────────────────────────────────────────────────── */
.tab-list {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  padding: 0 4px;
  border-bottom: 2px solid var(--color-shadow-dark);
  position: relative;
}

.tab {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 4px 12px;
  background-color: var(--color-surface);
  font-family: var(--font-system);
  font-size: var(--font-size-base);
  cursor: pointer;
  user-select: none;
  position: relative;
  bottom: -2px;
  border-style: solid;
  border-width: 2px 2px 0 2px;
  border-color:
    var(--color-highlight)
    var(--color-shadow-dark)
    transparent
    var(--color-highlight);
  box-shadow:
    inset  1px  0 0 var(--color-highlight-dark);
}

.tab--active {
  z-index: 1;
  padding-top: 6px;
  bottom: -2px;
  border-color:
    var(--color-highlight)
    var(--color-shadow-dark)
    var(--color-surface)
    var(--color-highlight);
  background-color: var(--color-surface);
}

.tab-panel {
  padding: var(--space-md);
  border-style: solid;
  border-width: 0 2px 2px 2px;
  border-color:
    transparent
    var(--color-shadow-dark)
    var(--color-shadow-dark)
    var(--color-highlight);
  box-shadow:
    inset -1px -1px 0 var(--color-shadow),
    inset  1px  0  0 var(--color-highlight-dark);
  background-color: var(--color-surface);
}

/* ── Scrollbar ──────────────────────────────────────────────── */
::-webkit-scrollbar {
  width: var(--scrollbar-width);
  height: var(--scrollbar-width);
}

::-webkit-scrollbar-track {
  background-color: var(--color-surface);
  background-image:
    repeating-conic-gradient(
      var(--color-surface) 0%,
      var(--color-surface) 25%,
      var(--color-highlight-dark) 25%,
      var(--color-highlight-dark) 50%
    );
  background-size: 4px 4px;
}

::-webkit-scrollbar-thumb {
  background-color: var(--color-surface);
  border-style: solid;
  border-width: 2px;
  border-color:
    var(--color-highlight)
    var(--color-shadow-dark)
    var(--color-shadow-dark)
    var(--color-highlight);
  box-shadow:
    inset  1px  1px 0 var(--color-highlight-dark),
    inset -1px -1px 0 var(--color-shadow);
}

::-webkit-scrollbar-button {
  background-color: var(--color-surface);
  border-style: solid;
  border-width: 2px;
  border-color:
    var(--color-highlight)
    var(--color-shadow-dark)
    var(--color-shadow-dark)
    var(--color-highlight);
  box-shadow:
    inset  1px  1px 0 var(--color-highlight-dark),
    inset -1px -1px 0 var(--color-shadow);
  display: block;
}

::-webkit-scrollbar-corner {
  background-color: var(--color-surface);
}

/* ── Tooltip ────────────────────────────────────────────────── */
.tooltip {
  position: absolute;
  z-index: 9999;
  background-color: #ffffe1;
  color: var(--color-black);
  font-family: var(--font-system);
  font-size: var(--font-size-base);
  padding: 3px 6px;
  border: 1px solid var(--color-black);
  pointer-events: none;
  white-space: nowrap;
  box-shadow: 1px 1px 0 var(--color-shadow-dark);
}

/* ── Dialog / Modal Overlay ─────────────────────────────────── */
.dialog-overlay {
  position: fixed;
  inset: 0;
  z-index: 999;
  /* Classic Win95 uses no dim overlay, but this is useful */
  background-color: transparent;
}

/* ── Desktop & Taskbar ──────────────────────────────────────── */
.desktop {
  position: relative;
  background-color: #008080;
  width: 100%;
  min-height: 100vh;
  overflow: hidden;
}

.taskbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 30px;
  background-color: var(--color-surface);
  display: flex;
  align-items: stretch;
  gap: 2px;
  padding: 2px 2px;
  border-top: 2px solid var(--color-highlight);
  box-shadow: inset 0 1px 0 var(--color-highlight-dark);
  z-index: 100;
}

.taskbar__start-btn {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0 10px;
  font-weight: bold;
  font-size: var(--font-size-base);
}

.taskbar__separator {
  width: 4px;
  align-self: stretch;
  border-left: 1px solid var(--color-shadow);
  border-right: 1px solid var(--color-highlight);
  margin: 2px 2px;
}

.taskbar__window-btn {
  min-width: 120px;
  max-width: 160px;
  flex: 1;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0 8px;
  font-size: var(--font-size-base);
  text-align: left;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.taskbar__clock {
  display: flex;
  align-items: center;
  padding: 0 8px;
  font-size: var(--font-size-base);
  border-style: solid;
  border-width: 1px;
  border-color:
    var(--color-shadow)
    var(--color-highlight)
    var(--color-highlight)
    var(--color-shadow);
  white-space: nowrap;
  margin-left: auto;
}

/* ── Tree View ──────────────────────────────────────────────── */
.tree-view {
  background-color: var(--color-white);
  font-size: var(--font-size-base);
  font-family: var(--font-system);
  overflow: auto;
  border-style: solid;
  border-width: 2px;
  border-color:
    var(--color-shadow-dark)
    var(--color-highlight)
    var(--color-highlight)
    var(--color-shadow-dark);
  box-shadow:
    inset  1px  1px 0 var(--color-shadow),
    inset -1px -1px 0 var(--color-highlight-dark);
  padding: 1px;
  user-select: none;
}

.tree-view ul {
  list-style: none;
  padding-left: 16px;
}

.tree-view > ul {
  padding-left: 4px;
}

.tree-view__item {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 1px 4px;
  cursor: default;
  white-space: nowrap;
}

.tree-view__item--selected {
  background-color: var(--color-selection-bg);
  color: var(--color-selection-text);
}

.tree-view__toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 9px;
  height: 9px;
  border: 1px solid var(--color-shadow-dark);
  background-color: var(--color-white);
  flex-shrink: 0;
  font-size: 10px;
  line-height: 1;
  cursor: pointer;
}

/* ── Typography Helpers ─────────────────────────────────────── */
.text-disabled {
  color: var(--color-text-disabled);
  text-shadow: 1px 1px 0 var(--color-highlight);
}

.text-selected {
  background-color: var(--color-selection-bg);
  color: var(--color-selection-text);
}

/* ── Dividers ───────────────────────────────────────────────── */
hr,
.divider {
  border: none;
  border-top: 1px solid var(--color-shadow);
  border-bottom: 1px solid var(--color-highlight);
  margin: var(--space-sm) 0;
}

/* ── Utilities ──────────────────────────────────────────────── */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.w-full { width: 100%; }

/* ── Focus Ring ─────────────────────────────────────────────── */
:focus-visible {
  outline: 1px dotted var(--color-black);
  outline-offset: 0;
}