/* Windows XP Luna Theme CSS */

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

body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  /* Windows XP Bliss Background Emulation (Blue Sky + Green Rolling Hill) */
  background: linear-gradient(to bottom, #4a89dc 0%, #70a7ff 40%, #87beff 60%);
  font-family: 'Tahoma', 'Segoe UI', sans-serif;
  font-size: 11px;
  color: #000;
  padding: 1rem;
  user-select: none;
  position: relative;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Green Bliss Hill Backdrop */
body::after {
  content: '';
  position: absolute;
  bottom: -20%;
  left: -20%;
  right: -20%;
  height: 60vh;
  background: radial-gradient(ellipse at 50% 0%, #63c733 0%, #3d961a 50%, #27690f 100%);
  border-radius: 50% 50% 0 0 / 100% 100% 0 0;
  z-index: 0;
  box-shadow: 0 -20px 50px rgba(0,0,0,0.15);
}

/* Windows XP Outer Container */
.xp-window {
  width: 650px;
  max-width: 100%;
  background: #ece9d8; /* XP Dialog Gray */
  border: 3px solid #0055ea;
  border-radius: 8px 8px 0 0;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.6);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
  z-index: 10;
}

/* XP Titlebar (Luna Blue) */
.xp-titlebar {
  background: linear-gradient(to bottom, #0058e6 0%, #3a93ff 8%, #0055ea 25%, #0045d0 100%);
  padding: 3px 6px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #fff;
  font-weight: bold;
  font-size: 12px;
  text-shadow: 1px 1px 1px #00227b;
}

.xp-title {
  display: flex;
  align-items: center;
  gap: 6px;
}

.xp-icon {
  font-size: 14px;
}

/* XP Control Buttons */
.xp-controls {
  display: flex;
  gap: 2px;
}

.xp-btn-ctrl {
  width: 21px;
  height: 21px;
  border: 1px solid #fff;
  border-radius: 3px;
  font-family: inherit;
  font-size: 11px;
  font-weight: bold;
  color: #fff;
  background: linear-gradient(to bottom, #3a93ff 0%, #0055ea 100%);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.5);
}

.xp-btn-ctrl:hover { filter: brightness(1.1); }
.xp-btn-ctrl:active { filter: brightness(0.9); }

.xp-btn-ctrl.close {
  background: linear-gradient(to bottom, #f26651 0%, #e0443e 50%, #c41e17 100%);
  border-color: #fff;
}

/* XP Menubar */
.xp-menubar {
  background: #ece9d8;
  border-bottom: 1px solid #aca899;
  padding: 2px 6px;
  display: flex;
  gap: 12px;
}

.menu-item {
  font-size: 11px;
  color: #000;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 2px;
}

.menu-item:hover {
  background: #316ac5;
  color: #fff;
}

/* XP Window Body (2 Columns) */
.xp-body {
  display: grid;
  grid-template-columns: 350px 1fr;
  padding: 8px;
  gap: 8px;
  background: #ece9d8;
}

/* Left Section */
.xp-main {
  display: flex;
  flex-direction: column;
}

/* Tabs */
.xp-tabs {
  display: flex;
  gap: 2px;
  border-bottom: 1px solid #919b9c;
  padding-left: 4px;
}

.xp-tab {
  background: #e3dfc8;
  border: 1px solid #919b9c;
  border-bottom: none;
  border-radius: 4px 4px 0 0;
  padding: 4px 10px;
  font-size: 11px;
  cursor: pointer;
  color: #444;
}

.xp-tab:hover { background: #fff; }
.xp-tab.active {
  background: #ece9d8;
  border-color: #7f9db9;
  font-weight: bold;
  color: #000;
  position: relative;
  top: 1px;
}

/* Digital Display Box */
.xp-display-box {
  background: #fff;
  border: 2px inset #7f9db9;
  padding: 6px 10px;
  margin: 8px 0;
  text-align: right;
  min-height: 65px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.xp-expr {
  font-size: 11px;
  color: #7f9db9;
  min-height: 14px;
}

.xp-result {
  font-size: 24px;
  font-family: 'Consolas', 'Courier New', monospace;
  font-weight: bold;
  color: #000;
  word-break: break-all;
}

/* XP Keys Grid */
.xp-keys {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
}

.xp-key {
  background: linear-gradient(to bottom, #ffffff 0%, #ece9d8 100%);
  border: 1px solid #003c74;
  border-radius: 3px;
  padding: 10px 0;
  font-size: 13px;
  font-weight: bold;
  color: #000080;
  cursor: pointer;
  box-shadow: inset 1px 1px 0 #fff, 1px 1px 2px rgba(0,0,0,0.15);
}

.xp-key:hover { background: #fff; border-color: #e67e22; }
.xp-key:active {
  background: #dbd8c7;
  box-shadow: inset 1px 1px 2px rgba(0,0,0,0.3);
}

.xp-key.fn { color: #800000; }
.xp-key.op { color: #0000d0; background: linear-gradient(to bottom, #f9f8f2 0%, #e3dfc8 100%); }
.xp-key.equals { color: #fff; background: linear-gradient(to bottom, #3a93ff 0%, #0055ea 100%); }
.xp-key.equals:hover { background: #3a93ff; }

/* Tip Mode UI */
.mode-view.hidden { display: none !important; }

.xp-tip-container {
  padding: 8px 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.xp-field {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.xp-field label { font-size: 11px; font-weight: bold; color: #000; }

.xp-input {
  background: #fff;
  border: 2px inset #7f9db9;
  padding: 5px 8px;
  font-family: inherit;
  font-size: 13px;
  outline: none;
}

.xp-tip-btns {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
}

.xp-btn-option {
  background: linear-gradient(to bottom, #fff 0%, #ece9d8 100%);
  border: 1px solid #7f9db9;
  border-radius: 3px;
  padding: 4px;
  font-size: 11px;
  cursor: pointer;
}

.xp-btn-option.active {
  background: linear-gradient(to bottom, #3a93ff 0%, #0055ea 100%);
  color: #fff;
  font-weight: bold;
}

.xp-summary-box {
  border: 1px solid #d0d0d0;
  border-radius: 4px;
  padding: 8px 10px;
  margin-top: 4px;
  background: #f5f4ea;
}

.xp-summary-box legend { font-weight: bold; padding: 0 4px; color: #000080; }

.xp-row {
  display: flex;
  justify-content: space-between;
  padding: 2px 0;
  font-size: 11px;
}

.xp-row.highlight {
  font-size: 12px;
  border-top: 1px solid #d0d0d0;
  margin-top: 4px;
  padding-top: 4px;
  color: #000080;
}

/* Sidebar Fieldsets */
.xp-sidebar {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.xp-fieldset {
  border: 1px solid #b5b5b5;
  border-radius: 4px;
  padding: 8px;
  background: #f7f6f0;
}

.xp-fieldset legend {
  font-weight: bold;
  padding: 0 4px;
  color: #000080;
}

.xp-history-top {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 4px;
}

.xp-small-btn {
  background: linear-gradient(to bottom, #ffffff 0%, #ece9d8 100%);
  border: 1px solid #7f9db9;
  border-radius: 2px;
  padding: 2px 8px;
  font-size: 10px;
  cursor: pointer;
}
.xp-small-btn:hover { background: #fff; }

.xp-history-list {
  background: #fff;
  border: 2px inset #7f9db9;
  height: 150px;
  overflow-y: auto;
  padding: 4px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.history-item {
  display: flex;
  justify-content: space-between;
  padding: 3px 6px;
  cursor: pointer;
  border-radius: 2px;
  font-size: 11px;
}

.history-item:hover {
  background: #316ac5;
  color: #fff;
}
.history-item:hover .res { color: #fff; }
.history-item .res { color: #0000d0; font-weight: bold; }

.xp-hint-row {
  display: flex;
  justify-content: space-between;
  padding: 2px 0;
  font-size: 10px;
  color: #444;
}

/* XP Statusbar */
.xp-statusbar {
  background: #ece9d8;
  border-top: 1px solid #aca899;
  padding: 3px 8px;
  font-size: 10px;
  color: #444;
  display: flex;
  justify-content: space-between;
}

/* Windows XP Error & Info Modal */
.xp-modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.xp-modal-overlay.hidden { display: none !important; }

.xp-modal-dialog {
  width: 420px;
  max-width: 90%;
  background: #ece9d8;
  border: 3px solid #0055ea;
  border-radius: 8px 8px 0 0;
  box-shadow: 0 10px 30px rgba(0,0,0,0.6);
  display: flex;
  flex-direction: column;
}

.xp-modal-body {
  padding: 1.2rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.xp-error-icon {
  font-size: 32px;
  line-height: 1;
}

.xp-error-msg {
  font-size: 12px;
  line-height: 1.4;
  color: #000;
}

.xp-modal-footer {
  padding: 8px 12px;
  background: #ece9d8;
  border-top: 1px solid #aca899;
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.xp-dialog-btn {
  background: linear-gradient(to bottom, #ffffff 0%, #ece9d8 100%);
  border: 1px solid #003c74;
  border-radius: 3px;
  padding: 4px 14px;
  font-family: inherit;
  font-size: 11px;
  font-weight: bold;
  color: #000;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.xp-dialog-btn.default {
  border: 2px solid #0055ea;
  background: linear-gradient(to bottom, #3a93ff 0%, #0055ea 100%);
  color: #fff;
}

/* BSOD Screen Overlay */
.bsod-screen {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: #0000aa;
  color: #ffffff;
  font-family: 'Consolas', 'Courier New', monospace;
  font-size: 14px;
  padding: 3rem;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.bsod-screen.hidden { display: none !important; }

.bsod-content {
  max-width: 650px;
  line-height: 1.6;
}

.blink {
  animation: blink 1s infinite;
  color: #ffff55;
  margin-top: 1rem;
}

@keyframes blink {
  50% { opacity: 0; }
}

@media (max-width: 600px) {
  .xp-body { grid-template-columns: 1fr; }
}