:root {
  --bg-1: #0b1020;
  --bg-2: #111827;
  --panel: rgba(16, 24, 39, 0.92);
  --taskbar: rgba(15, 23, 42, 0.92);
  --accent: #60a5fa;
  --text: #e5ecff;
  --muted: #9fb3d9;
  --border: rgba(148, 163, 184, 0.25);
  --shadow: rgba(0, 0, 0, 0.25);
}

body.light {
  --bg-1: #ecf3ff;
  --bg-2: #dfe9ff;
  --panel: rgba(255, 255, 255, 0.88);
  --taskbar: rgba(245, 247, 255, 0.96);
  --accent: #2563eb;
  --text: #18212f;
  --muted: #45566f;
  --border: rgba(37, 99, 235, 0.2);
  --shadow: rgba(37, 99, 235, 0.15);
}

body.neon {
  --bg-1: #071b1b;
  --bg-2: #0d312f;
  --panel: rgba(10, 30, 35, 0.92);
  --taskbar: rgba(11, 32, 42, 0.94);
  --accent: #42f5d7;
  --text: #d9fff9;
  --muted: #80d9d0;
  --border: rgba(66, 245, 215, 0.25);
  --shadow: rgba(0, 0, 0, 0.25);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  height: 100%;
  font-family: "Segoe UI", Tahoma, sans-serif;
  background: linear-gradient(135deg, var(--bg-1), var(--bg-2));
  color: var(--text);
}

body {
  transition: background 0.25s ease, color 0.25s ease;
}

.screen {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--bg-1), var(--bg-2));
}

.screen.hidden,
#os.hidden {
  display: none;
}

.setup-panel,
.login-panel {
  width: min(560px, 92vw);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 22px;
  box-shadow: 0 28px 70px var(--shadow);
  padding: 26px;
}

.setup-panel h1,
.login-panel h1 {
  margin-top: 0;
  margin-bottom: 18px;
  font-size: clamp(2rem, 3vw, 3rem);
}

.setup-step {
  margin-bottom: 18px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  border-radius: 14px;
}

.setup-step h2 {
  margin: 0 0 12px;
  font-size: 1.1rem;
}

.setup-panel label,
.login-panel label,
.settings-panel label {
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: var(--muted);
  margin-bottom: 10px;
}

.setup-panel input,
.setup-panel select,
.login-panel input,
.login-panel select,
.settings-panel input,
.settings-panel select,
#devCodeEditor {
  width: 100%;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  border-radius: 10px;
  padding: 10px 12px;
}

.radio-row {
  display: flex;
  gap: 18px;
  align-items: center;
  color: var(--text);
}

.primary-btn {
  background: linear-gradient(135deg, var(--accent), #7dd3fc);
  color: #08131f;
  font-weight: 700;
}

#os {
  position: relative;
  width: 100%;
  height: 100vh;
  overflow: hidden;
}

.taskbar {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 54px;
  background: var(--taskbar);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 14px;
  gap: 14px;
  z-index: 40;
}

.start-btn {
  background: linear-gradient(135deg, var(--accent), #7dd3fc);
  color: #08131f;
  font-weight: 700;
  padding: 8px 14px;
  border-radius: 12px;
  cursor: pointer;
}

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

.taskbar-pill {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  padding: 6px 10px;
  cursor: pointer;
}

.status-area {
  color: var(--muted);
  font-weight: 600;
  min-width: 90px;
  text-align: right;
}

.desktop {
  position: absolute;
  inset: 0 0 54px 0;
  padding: 28px;
  display: flex;
  flex-direction: column;
  flex-wrap: wrap;
  align-content: flex-start;
  gap: 18px;
}

.desktop-icon {
  width: 90px;
  text-align: center;
  cursor: pointer;
  user-select: none;
}

.desktop-icon:hover {
  transform: translateY(-1px);
}

.icon {
  width: 64px;
  height: 64px;
  display: grid;
  place-items: center;
  margin: 0 auto 8px;
  border-radius: 18px;
  font-size: 2rem;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border);
  box-shadow: 0 10px 18px var(--shadow);
}

.window {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: min(920px, 74vw);
  height: min(620px, 72vh);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 24px 60px var(--shadow);
  z-index: 20;
}

.window.hidden {
  display: none;
}

.window-titlebar {
  height: 42px;
  background: rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 12px;
  gap: 12px;
}

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

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: inline-block;
}

.dot.red { background: #ff5f57; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #28c840; }

.window-title {
  flex: 1;
  text-align: center;
  color: var(--muted);
  font-weight: 600;
}

.close-btn {
  border: none;
  background: transparent;
  color: var(--text);
  font-size: 1.5rem;
  cursor: pointer;
}

.browser-toolbar,
.notes-controls,
.ai-input-row,
.file-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.02);
}

.browser-toolbar input,
.ai-input-row input,
.settings-panel input,
.settings-panel select,
#fileEditor,
#noteEditor {
  width: 100%;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  border-radius: 10px;
  padding: 10px 12px;
}

button {
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  border-radius: 10px;
  padding: 8px 12px;
  cursor: pointer;
}

#browserFrame {
  width: 100%;
  height: calc(100% - 103px);
  border: 0;
  background: white;
}

#noteEditor,
#fileEditor {
  width: 100%;
  min-height: 360px;
  resize: vertical;
  border-top: none;
  border-radius: 0;
}

.ai-panel,
.file-manager,
.settings-panel {
  display: flex;
  flex-direction: column;
  height: calc(100% - 42px);
}

.ai-history {
  flex: 1;
  padding: 14px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.message {
  max-width: 80%;
  padding: 10px 12px;
  border-radius: 12px;
  line-height: 1.4;
}

.message.user {
  align-self: flex-end;
  background: rgba(96, 165, 250, 0.22);
}

.message.bot {
  align-self: flex-start;
  background: rgba(255, 255, 255, 0.04);
}

.file-list {
  min-height: 140px;
  max-height: 180px;
  overflow-y: auto;
  padding: 12px;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.file-item {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 10px;
  cursor: pointer;
}

.file-item.active {
  border-color: var(--accent);
  box-shadow: inset 0 0 0 1px var(--accent);
}

.settings-panel {
  padding: 18px;
  gap: 16px;
}

.dev-toggle {
  flex-direction: row !important;
  align-items: center;
  justify-content: flex-start;
}

.dev-mode-box {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px;
  background: rgba(255, 255, 255, 0.03);
}

.dev-mode-box.hidden {
  display: none;
}

#devCodeEditor {
  min-height: 160px;
  resize: vertical;
  font-family: "Consolas", monospace;
}

@media (max-width: 720px) {
  .window {
    width: 92vw;
    height: 72vh;
  }

  .desktop {
    padding: 18px;
  }
}