/* =========================================================
   LAYOUT.CSS — khung tổng thể của OS (không liên quan nội dung
   bên trong từng cửa sổ, xem apps.css cho phần đó)
   ========================================================= */

* { box-sizing: border-box; }

body {
  background-color: var(--bg-color);
  background-image:
    radial-gradient(circle at 50% 0%, rgba(255,255,255,0.04) 0%, transparent 60%);
  color: var(--main-color);
  font-family: var(--font-pixel-body);
  font-size: var(--base-font-size);
  line-height: 1.35;
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  user-select: none;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.pixel-title { font-family: var(--font-pixel-title); }
.readable-text {
  font-family: var(--font-mono-readable);
  font-size: 0.85em;
  line-height: 1.55;
}

/* ---------- TOP SYSTEM BAR ---------- */
#topbar {
  border-bottom: 2px solid var(--border-color);
  background-color: var(--window-bg);
  padding: 8px 12px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  position: sticky;
  top: 0;
  z-index: 500;
}

#topbar .brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
}

#topbar .sys-status {
  font-size: 10px;
  background: var(--dark-color);
  border: 1px solid var(--border-color);
  padding: 3px 6px;
}

#topbar .controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 11px;
}

#topbar select {
  background: var(--dark-color);
  color: var(--main-color);
  border: 1px solid var(--border-color);
  padding: 3px 6px;
  font-family: var(--font-mono-readable);
  cursor: pointer;
}

.topbar-btn {
  background: var(--dark-color);
  color: var(--main-color);
  border: 1px solid var(--border-color);
  padding: 4px 8px;
  font-family: var(--font-mono-readable);
  font-size: 11px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.topbar-btn:hover { background: var(--main-color); color: var(--bg-color); }

/* ---------- DESKTOP AREA: cửa sổ nổi, xếp mặc định phủ kín 16:9 ---------- */
#desktop {
  position: relative;
  width: 100%;
  min-height: calc(100vh - 110px);
  padding-bottom: 60px;
  overflow: hidden;
}

.desktop-icons {
  display: none; /* cửa sổ đã phủ kín: mở lại qua taskbar */
}

.desktop-icon {
  width: 78px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 4px;
  padding: 6px 4px;
  border: 1px solid transparent;
  cursor: pointer;
  font-size: 10px;
}
.desktop-icon:hover {
  border: 1px dashed var(--main-color);
  background: rgba(255,255,255,0.06);
}
.desktop-icon i { font-size: 20px; color: var(--main-color); }

/* ---------- TASKBAR ---------- */
#taskbar {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 600;
  background: var(--window-bg);
  border-top: 2px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 6px 10px;
  overflow-x: auto;
}

#taskbar .start-btn {
  font-family: var(--font-pixel-title);
  font-size: 10px;
  white-space: nowrap;
}

#taskbar-items {
  display: flex;
  gap: 6px;
  flex-wrap: nowrap;
}

.taskbar-btn {
  background: var(--dark-color);
  color: var(--main-color);
  border: 1px solid var(--border-color);
  font-family: var(--font-mono-readable);
  font-size: 11px;
  padding: 4px 8px;
  cursor: pointer;
  white-space: nowrap;
  max-width: 140px;
  overflow: hidden;
  text-overflow: ellipsis;
}
.taskbar-btn.active { background: var(--main-color); color: var(--bg-color); font-weight: bold; }
.taskbar-btn.minimized { opacity: 0.55; }

#clock {
  font-family: var(--font-mono-readable);
  font-size: 11px;
  background: var(--dark-color);
  border: 1px solid var(--border-color);
  padding: 4px 8px;
  white-space: nowrap;
}

#view-total {
  font-family: var(--font-mono-readable);
  font-size: 11px;
  background: var(--dark-color);
  border: 1px solid var(--border-color);
  padding: 4px 8px;
  white-space: nowrap;
}

/* Huy hiệu số người đang xem (góc trái, trên taskbar) */
#online-badge {
  position: fixed;
  left: 10px;
  bottom: 52px;
  z-index: 6000;
  background: var(--window-bg);
  border: 1px solid var(--border-color);
  box-shadow: 3px 3px 0 var(--dim-color);
  font-family: var(--font-mono-readable);
  font-size: 11px;
  padding: 4px 8px;
  white-space: nowrap;
}

/* ---------- TOAST NOTIFICATION ---------- */
#toast-root {
  position: fixed;
  bottom: 54px;
  right: 14px;
  z-index: 9998;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.toast {
  background: var(--main-color);
  color: var(--bg-color);
  border: 2px solid var(--border-color);
  font-family: var(--font-mono-readable);
  font-size: 12px;
  padding: 8px 12px;
  box-shadow: 4px 4px 0 var(--dim-color);
  animation: toastIn 0.15s ease-out;
  max-width: 260px;
}
@keyframes toastIn {
  from { transform: translateY(10px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* ---------- SCROLLBAR ---------- */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--dark-color); border: 1px solid var(--border-color); }
::-webkit-scrollbar-thumb { background: var(--main-color); }

/* ---------- RESPONSIVE ---------- */
@media (max-width: 860px) {
  .desktop-icons { display: none; }
  #topbar .brand span.sys-status { display: none; }
}