/* os.css — desktop, windows, taskbar */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&display=swap');

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  width: 100%; height: 100%; overflow: hidden;
  font-family: var(--font-ui);
  font-size: var(--text-base);
  color: var(--color-text-primary);
  background: var(--color-desktop);
  user-select: none;
  -webkit-font-smoothing: antialiased;
}

/* ── Boot screen ── */
#boot-screen {
  position: fixed; inset: 0; z-index: 9999;
  background: #1E2E3D;
  display: flex; align-items: center; justify-content: center;
  flex-direction: column; gap: var(--sp-4);
  transition: opacity 0.4s ease;
}
#boot-screen.boot-screen--done { opacity: 0; pointer-events: none; }

.boot-logo {
  font-family: var(--font-ui);
  font-size: var(--text-xl);
  font-weight: 300;
  letter-spacing: 0.15em;
  color: #8BAFC8;
  text-transform: uppercase;
}
.boot-subtitle {
  font-size: var(--text-sm);
  color: #4A637A;
  letter-spacing: 0.08em;
}
.boot-spinner {
  width: 24px; height: 24px;
  border: 2px solid #2A4A62;
  border-top-color: #6A9ABF;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-top: var(--sp-4);
}
@keyframes spin { to { transform: rotate(360deg); } }
.boot-error { color: #E05C5C; text-align: center; }
.boot-error code { display: block; margin-top: var(--sp-2); font-size: var(--text-sm); opacity: 0.7; }

/* ── OS Header bar ── */
#os-header {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--header-height);
  background: var(--color-header-bg);
  border-bottom: 1px solid var(--color-taskbar-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex; align-items: center;
  padding: 0 var(--sp-5);
  z-index: 500;
  gap: var(--sp-4);
}
.os-header-brand {
  display: flex; flex-direction: column;
}
#os-title {
  font-size: var(--text-md);
  font-weight: 600;
  color: var(--color-text-label);
  letter-spacing: 0.02em;
}
#os-subtitle {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  font-weight: 400;
}
.os-header-divider {
  width: 1px; height: 28px;
  background: var(--color-divider);
  margin: 0 var(--sp-2);
}
.os-header-meta {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ── Desktop ── */
#os-desktop {
  position: fixed;
  top: var(--header-height);
  left: 0; right: 0;
  bottom: var(--taskbar-height);
  background:
    linear-gradient(135deg, var(--color-desktop-grad1) 0%, var(--color-desktop) 50%, var(--color-desktop-grad2) 100%);
  overflow: hidden;
}

/* Subtle grid texture */
#os-desktop::before {
  content: '';
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

#desktop-grid {
  position: absolute;
  top: var(--sp-6); left: var(--sp-6);
  display: flex; flex-direction: column;
  gap: var(--sp-2);
  z-index: 1;
}

/* ── Desktop icons ── */
.desktop-icon {
  width: 88px;
  padding: var(--sp-2);
  border-radius: var(--radius-md);
  display: flex; flex-direction: column;
  align-items: center; gap: 5px;
  cursor: default;
  border: 1px solid transparent;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}
.desktop-icon:hover {
  background: rgba(255,255,255,0.30);
  border-color: rgba(255,255,255,0.40);
}
.desktop-icon--selected {
  background: var(--color-card-selected) !important;
  border-color: var(--color-accent) !important;
}
.desktop-icon-img {
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
}
.desktop-icon-img svg { width: 48px; height: 48px; }
.desktop-icon-label {
  font-size: var(--text-xs);
  color: var(--color-text-label);
  text-align: center;
  line-height: 1.3;
  word-break: break-word;
  max-width: 84px;
  text-shadow: 0 1px 2px rgba(255,255,255,0.5);
}

/* ── OS Windows ── */
.os-window {
  position: absolute;
  background: var(--color-window-bg);
  border: 1px solid var(--color-window-border);
  border-radius: var(--radius-win);
  box-shadow: var(--shadow-window);
  display: flex; flex-direction: column;
  overflow: hidden;
  min-width: 380px; min-height: 240px;
  opacity: 0; transform: scale(0.97);
  transition: opacity var(--transition-win), transform var(--transition-win), box-shadow var(--transition-ui);
}
.os-window--visible {
  opacity: 1; transform: scale(1);
}
.os-window--focused {
  box-shadow: var(--shadow-window-focused);
  border-color: #8BAFC8;
}
.os-window--minimized {
  display: none !important;
}
.os-window--maximized {
  border-radius: 0 !important;
}
.os-window--dragging {
  opacity: 0.92;
  cursor: grabbing !important;
  transition: none !important;
}
.os-window--resizing {
  transition: none !important;
}
.os-window--closing {
  opacity: 0; transform: scale(0.96);
  pointer-events: none;
  transition: opacity 0.15s ease, transform 0.15s ease;
}

/* ── Title bar ── */
.os-window-titlebar {
  height: var(--titlebar-height);
  background: var(--color-titlebar);
  border-bottom: 1px solid var(--color-divider);
  display: flex; align-items: center;
  padding: 0 var(--sp-2);
  cursor: grab; flex-shrink: 0;
  gap: var(--sp-2);
}
.os-window--focused .os-window-titlebar {
  background: var(--color-titlebar-focused);
}
.os-window-titlebar:active { cursor: grabbing; }
.os-window-controls {
  display: flex; gap: 6px; align-items: center;
  flex-shrink: 0;
}
.os-win-btn {
  width: 14px; height: 14px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  padding: 0;
  color: transparent;
  transition: filter var(--transition-fast);
}
.os-win-btn svg { width: 8px; height: 8px; }
.os-win-btn--close { background: var(--color-btn-close); }
.os-win-btn--min   { background: var(--color-btn-min); }
.os-win-btn--max   { background: var(--color-btn-max); }
.os-win-btn:hover  { color: rgba(0,0,0,0.5); filter: brightness(0.88); }
.os-window-title {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-titlebar-text);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  flex: 1; text-align: center;
  pointer-events: none;
}
.os-window-title-spacer { width: 70px; flex-shrink: 0; }

/* ── Window body ── */
.os-window-body {
  flex: 1;
  overflow: hidden;
  position: relative;
}

/* ── Resize handles ── */
.os-resize-handle {
  position: absolute; z-index: 10;
}
.os-resize-n  { top: -3px;  left: 8px;  right: 8px; height: 6px; cursor: n-resize; }
.os-resize-s  { bottom: -3px; left: 8px; right: 8px; height: 6px; cursor: s-resize; }
.os-resize-e  { right: -3px; top: 8px; bottom: 8px; width: 6px; cursor: e-resize; }
.os-resize-w  { left: -3px;  top: 8px; bottom: 8px; width: 6px; cursor: w-resize; }
.os-resize-nw { top: -3px; left: -3px; width: 12px; height: 12px; cursor: nw-resize; }
.os-resize-ne { top: -3px; right: -3px; width: 12px; height: 12px; cursor: ne-resize; }
.os-resize-sw { bottom: -3px; left: -3px; width: 12px; height: 12px; cursor: sw-resize; }
.os-resize-se { bottom: -3px; right: -3px; width: 12px; height: 12px; cursor: se-resize; }

/* ── Taskbar ── */
#os-taskbar {
  position: fixed; bottom: 0; left: 0; right: 0;
  height: var(--taskbar-height);
  background: var(--color-taskbar);
  border-top: 1px solid var(--color-taskbar-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex; align-items: center;
  padding: 0 var(--sp-4);
  z-index: 500;
  gap: var(--sp-3);
  box-shadow: var(--shadow-taskbar);
}

.taskbar-brand {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
  padding-right: var(--sp-3);
  border-right: 1px solid var(--color-divider);
}

#taskbar-windows {
  display: flex; align-items: center;
  gap: var(--sp-1); flex: 1;
  overflow: hidden;
}

.taskbar-win-btn {
  display: flex; align-items: center; gap: 6px;
  padding: 4px var(--sp-2);
  background: rgba(255,255,255,0.5);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  max-width: 160px;
  white-space: nowrap; overflow: hidden;
  transition: background var(--transition-fast), border-color var(--transition-fast);
  font-family: var(--font-ui);
}
.taskbar-win-btn:hover { background: rgba(255,255,255,0.8); border-color: var(--color-accent); }
.taskbar-win-btn--minimized { opacity: 0.55; }
.taskbar-win-icon { width: 14px; height: 14px; display: flex; align-items: center; flex-shrink: 0; }
.taskbar-win-icon svg { width: 14px; height: 14px; }
.taskbar-win-label { overflow: hidden; text-overflow: ellipsis; }

#taskbar-clock {
  font-size: var(--text-xs);
  font-variant-numeric: tabular-nums;
  color: var(--color-text-secondary);
  padding-left: var(--sp-3);
  border-left: 1px solid var(--color-divider);
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
}