.system-window {
  position: absolute;
  z-index: 30;
  top: 50%;
  left: 50%;
  width: min(850px, calc(100vw - 36px));
  height: min(570px, calc(100vh - 100px));
  transform: translate(-50%, -50%);
  overflow: hidden;
  background: var(--panel-solid);
  color: var(--desktop-text);
  border: 1px solid var(--panel-border);
  border-radius: 13px;
  box-shadow: 0 25px 90px rgba(0,0,0,.4);
}

.system-window.maximized {
  top: 0;
  left: 0;
  width: 100%;
  height: calc(100% - var(--taskbar-height));
  transform: none;
  border-radius: 0;
}

.window-titlebar {
  height: 43px;
  padding: 0 10px 0 15px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(128,128,128,.08);
  border-bottom: 1px solid var(--panel-border);
  cursor: grab;
}

.window-titlebar:active { cursor: grabbing; }

.window-title {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 13px;
}

.window-controls { display: flex; height: 100%; }
.window-controls button {
  width: 42px;
  border: 0;
  background: transparent;
  color: inherit;
}

.window-controls button:hover { background: rgba(128,128,128,.2); }
.window-controls button:last-child:hover { background: #d94141; color: white; }

.settings-content {
  height: calc(100% - 43px);
  display: grid;
  grid-template-columns: 220px minmax(0,1fr);
  overflow: hidden;
}

.settings-sidebar {
  padding: 17px 12px;
  background: rgba(128,128,128,.07);
  border-right: 1px solid var(--panel-border);
}

.settings-profile {
  padding: 8px 5px 22px;
  margin-bottom: 10px;
}

.settings-profile img { width: 40px; height: 40px; }
.settings-profile div { display: flex; flex-direction: column; gap: 3px; }
.settings-profile strong { font-size: 13px; }
.settings-profile span { font-size: 11px; opacity: .65; }

.settings-nav {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 11px 10px;
  margin-bottom: 4px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: inherit;
  text-align: left;
  font-size: 13px;
}

.settings-nav:hover, .settings-nav.active {
  background: rgba(128,128,128,.18);
}

.settings-nav.active { box-shadow: inset 3px 0 var(--accent); }
.settings-nav i { font-size: 17px; }

.settings-main {
  padding: 28px;
  overflow-y: auto;
}

.settings-page { display: none; }
.settings-page.active { display: block; }

.settings-page h2 {
  margin: 0 0 8px;
  font-size: 25px;
}

.settings-page > p {
  color: var(--desktop-muted);
  font-size: 13px;
  margin-bottom: 26px;
}

.settings-page h3 {
  margin: 25px 0 12px;
  font-size: 14px;
}

.os-picker {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.os-choice {
  min-height: 82px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: rgba(128,128,128,.1);
  border: 1px solid var(--panel-border);
  border-radius: 9px;
  color: inherit;
  font-size: 12px;
}

.os-choice i { font-size: 26px; }
.os-choice.active { border: 2px solid var(--accent); }

.theme-picker { display: flex; gap: 8px; }
.theme-picker button, .primary-button {
  border: 1px solid var(--panel-border);
  border-radius: 7px;
  padding: 9px 15px;
  background: rgba(128,128,128,.12);
  color: inherit;
}

.primary-button {
  margin-top: 15px;
  background: var(--accent);
  color: white;
  border: 0;
}

.wallpaper-picker {
  display: grid;
  grid-template-columns: repeat(3, minmax(0,1fr));
  gap: 10px;
}

.wallpaper-picker button {
  padding: 5px;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  background: rgba(128,128,128,.1);
  color: inherit;
}

.wallpaper-picker img {
  display: block;
  width: 100%;
  height: 75px;
  object-fit: cover;
  border-radius: 5px;
  background: linear-gradient(135deg,#273957,#14151b);
}

.wallpaper-picker span {
  display: block;
  padding: 7px 2px 3px;
  font-size: 11px;
}

.upload-wallpaper {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  padding: 10px 14px;
  background: rgba(128,128,128,.12);
  border-radius: 8px;
  font-size: 12px;
  cursor: pointer;
}

.upload-wallpaper input { display: none; }

.settings-page label:not(.upload-wallpaper) {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 18px 0;
  font-size: 13px;
}

.settings-page label input[type="text"] {
  max-width: 400px;
  padding: 10px;
  border: 1px solid var(--panel-border);
  border-radius: 7px;
  background: rgba(128,128,128,.1);
  color: inherit;
}

.settings-page .setting-switch {
  flex-direction: row !important;
  justify-content: space-between;
  align-items: center;
  max-width: 450px;
  padding: 12px 0;
  border-bottom: 1px solid var(--panel-border);
}

.about-logo {
  width: 70px;
  height: 70px;
  display: grid;
  place-items: center;
  background: rgba(128,128,128,.15);
  border-radius: 18px;
  font-size: 38px;
}