:root {
  color-scheme: light;
  --accent: #33a1ff;
  --accent-strong: #0d72d6;
  --shadow-lg: 0 18px 45px rgba(0, 0, 0, 0.35);
  --shadow-sm: 0 6px 16px rgba(0, 0, 0, 0.2);
  --glass: rgba(255, 255, 255, 0.18);
  --glass-strong: rgba(255, 255, 255, 0.35);
  --bg-dark: rgba(0, 0, 0, 0.55);
  --terminal-bg: #12141d;
  --terminal-fg: #e0f2ff;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  height: 100%;
  width: 100%;
  font-family: "Roboto", Arial, sans-serif;
  background: #0b1d3c;
  overflow: hidden;
  user-select: none;
}

body.loading {
  overflow: hidden;
}

#boot-screen {
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at top, #123163 0%, #050b1b 60%, #03040b 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #d8ebff;
  z-index: 9999;
  transition: opacity 1s ease;
}

#boot-logo {
  font-size: 52px;
  font-weight: 300;
  letter-spacing: 12px;
  text-transform: uppercase;
}

#boot-progress {
  margin-top: 60px;
  width: 280px;
  height: 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}

.boot-bar {
  height: 100%;
  width: 0%;
  border-radius: inherit;
  background: linear-gradient(90deg, rgba(93, 200, 255, 0.85), rgba(36, 139, 255, 0.95));
  box-shadow: 0 0 18px rgba(69, 169, 255, 0.75);
  animation: boot-slide 5s ease forwards;
}

@keyframes boot-slide {
  0% { width: 0%; }
  50% { width: 64%; }
  80% { width: 88%; }
  100% { width: 100%; }
}

#boot-tip {
  margin-top: 30px;
  font-size: 14px;
  opacity: 0.65;
}

#desktop {
  position: relative;
  width: 100%;
  height: 100%;
  display: none;
  background: linear-gradient(135deg, #051937 0%, #004058 45%, #006064 100%);
  background-attachment: fixed;
}

#background-stars canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

#desktop-icons {
  position: absolute;
  top: 20px;
  left: 24px;
  display: grid;
  grid-template-columns: repeat(auto-fill, 100px);
  gap: 24px 12px;
  z-index: 2;
}

.icon {
  width: 90px;
  padding: 14px 10px 8px 10px;
  border-radius: 12px;
  background: rgba(5, 15, 35, 0.2);
  backdrop-filter: blur(6px);
  text-align: center;
  color: #f4f9ff;
  cursor: pointer;
  transition: transform 0.25s ease, background 0.25s ease, box-shadow 0.25s ease;
}

.icon:hover {
  transform: translateY(-3px) scale(1.03);
  background: rgba(28, 63, 112, 0.48);
  box-shadow: var(--shadow-sm);
}

.icon .emoji {
  font-size: 32px;
  display: block;
  margin-bottom: 10px;
}

.icon span {
  display: block;
  font-size: 13px;
  font-weight: 400;
}

#taskbar {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 56px;
  background: rgba(6, 18, 40, 0.70);
  backdrop-filter: blur(16px);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 14px;
  z-index: 999;
}

#start-button {
  width: 46px;
  height: 46px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(22, 154, 255, 0.95), rgba(12, 80, 255, 0.85));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  color: #fff;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}

#taskbar-apps {
  flex: 1;
  display: flex;
  gap: 10px;
  align-items: center;
}

.taskbar-button {
  min-width: 140px;
  padding: 10px 14px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.14);
  color: #e9f4ff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-size: 14px;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}

.taskbar-button.active {
  background: rgba(51, 161, 255, 0.55);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.25);
}

#system-tray {
  display: flex;
  align-items: center;
  gap: 18px;
  color: rgba(222, 238, 255, 0.85);
}

#clock {
  font-size: 14px;
  letter-spacing: 0.6px;
}

#start-menu {
  position: absolute;
  bottom: 68px;
  left: 18px;
  width: 340px;
  border-radius: 22px;
  background: rgba(8, 28, 60, 0.82);
  backdrop-filter: blur(22px);
  padding: 20px;
  color: #f3faff;
  display: none;
  box-shadow: var(--shadow-lg);
  z-index: 900;
}

#start-menu h2 {
  margin: 0 0 12px 0;
  font-weight: 500;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  font-size: 18px;
}

#start-menu .app-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.start-app {
  border-radius: 12px;
  padding: 12px;
  background: rgba(255, 255, 255, 0.08);
  text-align: center;
  cursor: pointer;
  font-size: 13px;
  transition: transform 0.2s ease, background 0.2s ease;
}

.start-app:hover {
  transform: translateY(-3px);
  background: rgba(51, 161, 255, 0.35);
}

.start-app .emoji {
  font-size: 22px;
  margin-bottom: 6px;
}

.window {
  position: absolute;
  width: 640px;
  min-width: 360px;
  min-height: 260px;
  height: 470px;
  border-radius: 16px;
  overflow: hidden;
  backdrop-filter: blur(16px);
  background: rgba(10, 24, 46, 0.88);
  box-shadow: var(--shadow-lg);
  display: none;
  flex-direction: column;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.window.active {
  box-shadow: 0 22px 45px rgba(0, 0, 0, 0.45);
  border: 1px solid rgba(79, 187, 255, 0.55);
}

.window-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: rgba(4, 15, 40, 0.9);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  cursor: grab;
}

.window-title {
  color: #e7f3ff;
  font-weight: 500;
  letter-spacing: 0.8px;
}

.window-controls {
  display: flex;
  gap: 8px;
}

.window-controls button {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
}

.window-controls button:nth-child(1) { background: #5cc465; }
.window-controls button:nth-child(2) { background: #f0c95c; }
.window-controls button:nth-child(3) { background: #f76f6f; }

.window-body {
  position: relative;
  flex: 1;
  background: rgba(2, 7, 16, 0.6);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.window-footer {
  padding: 6px 16px;
  background: rgba(255, 255, 255, 0.05);
  font-size: 12px;
  color: rgba(223, 239, 255, 0.75);
}

.window-resizer {
  position: absolute;
  width: 16px;
  height: 16px;
  right: 6px;
  bottom: 6px;
  cursor: nwse-resize;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 4px;
}

#text-editor-window textarea {
  flex: 1;
  resize: none;
  border: none;
  padding: 18px;
  background: rgba(1, 9, 22, 0.85);
  color: #f6fbff;
  font-size: 16px;
  font-family: "Fira Code", Consolas, monospace;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

#text-editor-toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 18px;
  background: rgba(255, 255, 255, 0.06);
  color: #cbe6ff;
  font-size: 13px;
}

#text-editor-toolbar button,
#code-editor-toolbar button,
#file-manager-toolbar button,
#paint-toolbar button {
  padding: 6px 12px;
  border-radius: 8px;
  border: none;
  background: rgba(51, 161, 255, 0.25);
  color: #e8f4ff;
  cursor: pointer;
  font-size: 13px;
}

#text-editor-toolbar button:hover,
#code-editor-toolbar button:hover,
#file-manager-toolbar button:hover,
#paint-toolbar button:hover {
  background: rgba(87, 190, 255, 0.5);
}

#text-editor-status {
  margin-left: auto;
  opacity: 0.7;
}

#terminal-output {
  flex: 1;
  background: var(--terminal-bg);
  color: var(--terminal-fg);
  padding: 16px;
  overflow-y: auto;
  font-family: "Fira Code", Consolas, monospace;
  font-size: 14px;
}

#terminal-input {
  background: rgba(14, 26, 46, 0.95);
  color: #f1f8ff;
  border: none;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 12px 16px;
  font-family: inherit;
  font-size: 14px;
  resize: none;
  min-height: 44px;
}

#terminal-status {
  display: flex;
  justify-content: space-between;
}

#code-editor {
  flex: 1;
}

#code-editor-toolbar {
  padding: 12px 18px;
  background: rgba(255, 255, 255, 0.06);
  display: flex;
  gap: 12px;
  align-items: center;
}

#code-language {
  padding: 6px 12px;
  border-radius: 8px;
  border: none;
  background: rgba(255, 255, 255, 0.1);
  color: #e3f2ff;
}

#file-manager {
  display: grid;
  grid-template-columns: 220px 1fr;
  height: 100%;
}

#file-tree {
  background: rgba(3, 13, 28, 0.75);
  padding: 16px;
  overflow-y: auto;
  border-right: 1px solid rgba(255, 255, 255, 0.06);
}

.tree-node {
  padding: 6px 8px;
  border-radius: 6px;
  cursor: pointer;
  color: #d7ecff;
  font-size: 14px;
}

.tree-node.folder {
  font-weight: 500;
}

.tree-node.active {
  background: rgba(51, 161, 255, 0.35);
}

.tree-children {
  padding-left: 14px;
}

#file-manager-panel {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#file-manager-toolbar {
  padding: 12px 18px;
  background: rgba(255, 255, 255, 0.06);
  display: flex;
  gap: 12px;
}

#file-details {
  flex: 1;
  padding: 18px;
  overflow-y: auto;
  color: #dff1ff;
}

#file-preview {
  margin-top: 14px;
  padding: 14px;
  background: rgba(0, 7, 16, 0.65);
  border-radius: 12px;
  max-height: 240px;
  overflow-y: auto;
  font-family: "Fira Code", Consolas, monospace;
  font-size: 13px;
  white-space: pre-wrap;
}

#paint-canvas {
  flex: 1;
  background: #111a2a;
  cursor: crosshair;
}

#paint-toolbar {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.06);
}

#paint-colors {
  display: flex;
  gap: 8px;
}

.paint-color {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.4);
  cursor: pointer;
}

#paint-brush,
#paint-size {
  padding: 6px 8px;
  border-radius: 8px;
  border: none;
}

#game-canvas {
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 50% 20%, #1e2c5a, #040711);
}

#game-overlay {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(5, 15, 35, 0.85);
  padding: 20px 28px;
  border-radius: 16px;
  color: #f1f8ff;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

#notification-center {
  position: absolute;
  right: 18px;
  top: 20px;
  width: 300px;
  border-radius: 22px;
  background: rgba(8, 24, 48, 0.78);
  backdrop-filter: blur(22px);
  color: #e3f0ff;
  padding: 18px;
  box-shadow: var(--shadow-lg);
  display: none;
  z-index: 700;
}

.notification {
  background: rgba(255, 255, 255, 0.08);
  padding: 12px;
  border-radius: 12px;
  margin-bottom: 10px;
}

.hidden {
  display: none !important;
}

.glass-card {
  background: rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 16px;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.06);
  margin-bottom: 14px;
}

#system-overview {
  position: absolute;
  right: 20px;
  bottom: 80px;
  width: 280px;
  background: rgba(0, 10, 26, 0.7);
  border-radius: 18px;
  padding: 16px;
  color: #d8ecff;
  box-shadow: var(--shadow-lg);
  font-size: 13px;
}

#system-overview h3 {
  margin-top: 0;
  font-weight: 500;
  letter-spacing: 0.6px;
}

#system-overview .stat {
  margin: 8px 0;
}

#system-overview .meter {
  height: 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  overflow: hidden;
}

#system-overview .meter span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, rgba(81, 210, 255, 0.85), rgba(17, 101, 255, 0.9));
  width: 55%;
}

@media (max-width: 960px) {
  #desktop-icons {
    grid-template-columns: repeat(auto-fill, 80px);
    left: 14px;
    top: 14px;
  }

  .window {
    width: 90%;
    height: 70%;
  }
}