/* ============================================================
   Windows 98 desktop — lightweight recreation
   ============================================================ */

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

:root {
  --teal: #008080;
  --face: #c0c0c0;
  --face-dark: #808080;
  --face-darker: #404040;
  --face-light: #ffffff;
  --title: #000080;
  --title-inactive: #808080;
  --title-text: #ffffff;
  --desktop-text: #ffffff;
  --window-bg: #c0c0c0;
  --content-bg: #ffffff;
  --link: #0000ee;
  --font: "MS Sans Serif", "Microsoft Sans Serif", Tahoma, "Segoe UI", sans-serif;
  --mono: "Fixedsys", "Courier New", Consolas, monospace;
  --taskbar-h: 28px;
  --border-out: 2px solid;
}

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  font-family: var(--font);
  font-size: 12px;
  background: #000;
  color: #000;
  user-select: none;
  -webkit-user-select: none;
  cursor: default;
}

button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  background: none;
  border: none;
  padding: 0;
  cursor: default;
}

a { color: var(--link); }

/* ---- Boot ---- */
.boot {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: #000;
  color: #c0c0c0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 28px;
  font-family: var(--mono);
}
/* author display:flex 会压过 UA 的 [hidden]，必须显式关掉 */
.boot[hidden] {
  display: none !important;
}
.boot-logo {
  font-size: 28px;
  letter-spacing: 0.04em;
}
.boot-logo span {
  display: block;
  font-size: 42px;
  color: #fff;
  margin-top: 4px;
}
.boot-logo sub {
  font-size: 0.55em;
  vertical-align: super;
  color: #ff0;
}
.boot-bar {
  width: min(280px, 70vw);
  height: 18px;
  border: 2px solid #808080;
  border-right-color: #fff;
  border-bottom-color: #fff;
  background: #000;
  padding: 2px;
}
.boot-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #000080, #1084d0);
  animation: bootFill 1.4s steps(20) forwards;
}
@keyframes bootFill {
  to { width: 100%; }
}
.boot-hint {
  margin: 0;
  font-size: 12px;
  color: #808080;
  letter-spacing: 0.04em;
}
/* 万一 JS 挂了，动画结束后自动藏启动画面 */
.boot:not([hidden]) {
  animation: bootAutoHide 0s linear 2s forwards;
}
@keyframes bootAutoHide {
  to {
    visibility: hidden;
    opacity: 0;
    pointer-events: none;
  }
}

/* ---- Desktop ---- */
.desktop {
  position: relative;
  width: 100%;
  height: 100%;
  background: var(--teal);
  overflow: hidden;
}

.icons {
  position: absolute;
  top: 8px;
  left: 8px;
  bottom: calc(var(--taskbar-h) + 8px);
  display: flex;
  flex-direction: column;
  flex-wrap: wrap;
  align-content: flex-start;
  gap: 4px 18px;
  padding: 4px;
  z-index: 1;
}

.icon {
  width: 76px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 4px 2px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--desktop-text);
  text-align: center;
}
.icon:focus,
.icon.selected {
  outline: none;
  background: rgba(0, 0, 128, 0.45);
  border-color: rgba(255, 255, 255, 0.35);
}
.icon:focus .icon-label,
.icon.selected .icon-label {
  background: var(--title);
  color: #fff;
}
.icon-glyph {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  font-size: 28px;
  line-height: 1;
  filter: drop-shadow(1px 1px 0 rgba(0,0,0,0.35));
}
.icon-label {
  font-size: 11px;
  line-height: 1.25;
  padding: 1px 3px;
  max-width: 72px;
  word-break: break-word;
  text-shadow: 1px 1px 0 rgba(0,0,0,0.55);
}

/* ---- Windows ---- */
.window-layer {
  position: absolute;
  inset: 0 0 var(--taskbar-h) 0;
  z-index: 5;
  pointer-events: none;
}

.window {
  position: absolute;
  min-width: 240px;
  min-height: 140px;
  display: flex;
  flex-direction: column;
  background: var(--face);
  border-top: 2px solid var(--face-light);
  border-left: 2px solid var(--face-light);
  border-right: 2px solid var(--face-darker);
  border-bottom: 2px solid var(--face-darker);
  box-shadow: 1px 1px 0 var(--face-darker);
  pointer-events: auto;
  z-index: 10;
}
.window::after {
  /* outer dark edge */
  content: '';
  position: absolute;
  inset: -1px;
  border: 1px solid #000;
  pointer-events: none;
}
.window.inactive .titlebar {
  background: var(--title-inactive);
}
.window.minimized {
  display: none;
}
.window.maximized {
  inset: 0 !important;
  width: auto !important;
  height: auto !important;
  resize: none;
}

.titlebar {
  display: flex;
  align-items: center;
  gap: 4px;
  height: 20px;
  padding: 2px 3px 2px 4px;
  background: linear-gradient(90deg, #000080, #1084d0);
  color: var(--title-text);
  cursor: default;
  flex-shrink: 0;
}
.titlebar-icon {
  font-size: 12px;
  line-height: 1;
  width: 14px;
  text-align: center;
}
.titlebar-text {
  flex: 1;
  font-weight: 700;
  font-size: 11px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  letter-spacing: 0.01em;
}
.titlebar-btns {
  display: flex;
  gap: 2px;
}
.tb-btn {
  width: 16px;
  height: 14px;
  display: grid;
  place-items: center;
  background: var(--face);
  border-top: 1px solid var(--face-light);
  border-left: 1px solid var(--face-light);
  border-right: 1px solid var(--face-darker);
  border-bottom: 1px solid var(--face-darker);
  color: #000;
  font-size: 10px;
  line-height: 1;
  font-weight: 700;
  padding: 0;
}
.tb-btn:active {
  border-top-color: var(--face-darker);
  border-left-color: var(--face-darker);
  border-right-color: var(--face-light);
  border-bottom-color: var(--face-light);
  padding-top: 1px;
  padding-left: 1px;
}
.tb-btn.close {
  margin-left: 2px;
}

.window-body {
  flex: 1;
  margin: 2px;
  background: var(--content-bg);
  border-top: 2px solid var(--face-darker);
  border-left: 2px solid var(--face-darker);
  border-right: 2px solid var(--face-light);
  border-bottom: 2px solid var(--face-light);
  overflow: auto;
  color: #000;
  user-select: text;
  -webkit-user-select: text;
  min-height: 0;
}

/* Notepad style */
.notepad {
  padding: 8px 10px;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.55;
  white-space: pre-wrap;
  word-break: break-word;
}
.notepad h1 {
  font-family: var(--font);
  font-size: 14px;
  margin: 0 0 10px;
  border-bottom: 1px solid #808080;
  padding-bottom: 6px;
}
.notepad p { margin: 0 0 10px; }
.notepad .muted { color: #555; }
.notepad a { color: var(--link); }

/* Explorer / app body */
.app-body {
  padding: 12px;
  font-size: 12px;
  line-height: 1.5;
}
.app-body h1 {
  font-size: 14px;
  margin: 0 0 8px;
}
.app-body p { margin: 0 0 10px; }
.app-body .field {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 4px 10px;
  margin-bottom: 6px;
  align-items: baseline;
}
.app-body .field span:first-child {
  color: #444;
}
.app-body .stats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0;
}
.app-body .stat {
  border-top: 1px solid var(--face-light);
  border-left: 1px solid var(--face-light);
  border-right: 1px solid var(--face-darker);
  border-bottom: 1px solid var(--face-darker);
  background: var(--face);
  padding: 6px 10px;
  min-width: 72px;
  text-align: center;
}
.app-body .stat b {
  display: block;
  font-size: 16px;
}
.app-body .repo-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid #808080;
}
.app-body .repo-list li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 6px 2px;
  border-bottom: 1px solid #dfdfdf;
}
.app-body .actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.win-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 75px;
  height: 23px;
  padding: 0 12px;
  background: var(--face);
  border-top: 2px solid var(--face-light);
  border-left: 2px solid var(--face-light);
  border-right: 2px solid var(--face-darker);
  border-bottom: 2px solid var(--face-darker);
  color: #000;
  text-decoration: none;
  font-family: var(--font);
  font-size: 12px;
  cursor: default;
}
.win-btn:active {
  border-top-color: var(--face-darker);
  border-left-color: var(--face-darker);
  border-right-color: var(--face-light);
  border-bottom-color: var(--face-light);
  padding-top: 1px;
  padding-left: 1px;
}
.win-btn:focus {
  outline: 1px dotted #000;
  outline-offset: -4px;
}

/* ---- Internet Explorer 风格窗口 ---- */
.ie {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 0;
  background: var(--face);
}
.ie-toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 6px;
  background: var(--face);
  border-bottom: 1px solid var(--face-dark);
  flex-shrink: 0;
}
.ie-label {
  font-size: 11px;
  color: #000;
  flex-shrink: 0;
}
.ie-address {
  flex: 1;
  min-width: 0;
  height: 20px;
  padding: 0 4px;
  font-family: var(--font);
  font-size: 11px;
  border-top: 2px solid var(--face-darker);
  border-left: 2px solid var(--face-darker);
  border-right: 2px solid var(--face-light);
  border-bottom: 2px solid var(--face-light);
  background: #fff;
  color: #000;
  outline: none;
}
.ie-go {
  min-width: 48px;
  height: 22px;
  flex-shrink: 0;
}
.ie-status {
  order: 3;
  padding: 2px 6px;
  font-size: 11px;
  background: var(--face);
  border-top: 1px solid var(--face-light);
  color: #222;
  flex-shrink: 0;
}
.ie-content {
  flex: 1;
  min-height: 0;
  overflow: auto;
  background: #fff;
  border-top: 2px solid var(--face-darker);
  border-left: 2px solid var(--face-darker);
  border-right: 2px solid var(--face-light);
  border-bottom: 2px solid var(--face-light);
  margin: 0 2px;
}
.ie-card h2 {
  margin: 0 0 8px;
  font-size: 16px;
}
.ie-card p {
  margin: 0 0 10px;
}
.ie-card .muted {
  color: #555;
  font-size: 11px;
}
.repo-list a {
  cursor: pointer;
}

/* ---- Taskbar ---- */
.taskbar {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: var(--taskbar-h);
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 2px 2px 2px 2px;
  background: var(--face);
  border-top: 2px solid var(--face-light);
  z-index: 100;
  box-shadow: inset 0 1px 0 #fff;
}

.start-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  height: 22px;
  padding: 0 6px 0 4px;
  background: var(--face);
  border-top: 2px solid var(--face-light);
  border-left: 2px solid var(--face-light);
  border-right: 2px solid var(--face-darker);
  border-bottom: 2px solid var(--face-darker);
  font-weight: 700;
  font-size: 11px;
  flex-shrink: 0;
}
.start-btn:active,
.start-btn[aria-expanded="true"] {
  border-top-color: var(--face-darker);
  border-left-color: var(--face-darker);
  border-right-color: var(--face-light);
  border-bottom-color: var(--face-light);
  padding-top: 1px;
  padding-left: 5px;
}
.start-logo {
  width: 16px;
  height: 16px;
  background:
    linear-gradient(90deg, #f44 50%, #0c0 50%) 0 0 / 100% 50% no-repeat,
    linear-gradient(90deg, #08f 50%, #ff0 50%) 0 100% / 100% 50% no-repeat;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.25);
}

.task-buttons {
  flex: 1;
  display: flex;
  gap: 3px;
  min-width: 0;
  overflow: hidden;
  padding: 0 2px;
}
.task-btn {
  max-width: 160px;
  min-width: 80px;
  height: 22px;
  padding: 0 8px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: var(--face);
  border-top: 2px solid var(--face-light);
  border-left: 2px solid var(--face-light);
  border-right: 2px solid var(--face-darker);
  border-bottom: 2px solid var(--face-darker);
  font-size: 11px;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}
.task-btn.active {
  border-top-color: var(--face-darker);
  border-left-color: var(--face-darker);
  border-right-color: var(--face-light);
  border-bottom-color: var(--face-light);
  background: #dfdfdf;
  font-weight: 700;
}
.task-btn .t-icon { font-size: 12px; flex-shrink: 0; }

.tray {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 22px;
  padding: 0 6px;
  border-top: 1px solid var(--face-dark);
  border-left: 1px solid var(--face-dark);
  border-right: 1px solid var(--face-light);
  border-bottom: 1px solid var(--face-light);
  flex-shrink: 0;
  margin-right: 2px;
}
.tray-icon { font-size: 12px; line-height: 1; }
.clock {
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  min-width: 42px;
  text-align: center;
}

/* ---- Start menu ---- */
.start-menu {
  position: absolute;
  left: 2px;
  bottom: calc(var(--taskbar-h) + 2px);
  width: 200px;
  display: flex;
  background: var(--face);
  border-top: 2px solid var(--face-light);
  border-left: 2px solid var(--face-light);
  border-right: 2px solid var(--face-darker);
  border-bottom: 2px solid var(--face-darker);
  box-shadow: 2px 2px 0 rgba(0,0,0,0.35);
  z-index: 200;
}
.start-menu[hidden] { display: none; }
.start-banner {
  width: 22px;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  background: linear-gradient(180deg, #000080, #1084d0);
  color: #fff;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.08em;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding: 8px 2px;
  gap: 4px;
}
.start-banner strong {
  color: #c0c0c0;
  font-weight: 400;
}
.start-list {
  list-style: none;
  margin: 0;
  padding: 2px 0;
  flex: 1;
}
.start-list li.sep {
  height: 0;
  margin: 3px 4px;
  border-top: 1px solid var(--face-dark);
  border-bottom: 1px solid var(--face-light);
}
.start-list button,
.start-list a {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 6px 10px;
  text-align: left;
  text-decoration: none;
  color: #000;
  font-size: 12px;
  background: transparent;
  border: none;
}
.start-list button:hover,
.start-list a:hover,
.start-list button:focus,
.start-list a:focus {
  background: var(--title);
  color: #fff;
  outline: none;
}
.sm-icon {
  width: 18px;
  text-align: center;
  font-size: 14px;
}

/* ---- Shutdown ---- */
.shutdown {
  position: fixed;
  inset: 0;
  z-index: 500;
  background: #000;
  color: #ff0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-family: var(--mono);
  font-size: 16px;
  text-align: center;
  padding: 24px;
}
.shutdown[hidden] { display: none; }
.shutdown-sub { color: #808080; font-size: 12px; margin: 0; }
.shutdown .win-btn { color: #000; margin: 4px; }

/* ---- Mobile ---- */
@media (max-width: 640px) {
  .icons {
    flex-direction: row;
    flex-wrap: wrap;
    align-content: flex-start;
    right: 8px;
    bottom: auto;
    max-height: 45%;
  }
  .window {
    min-width: 0;
  }
  .task-btn { min-width: 56px; max-width: 100px; }
  .start-menu { width: min(220px, calc(100vw - 8px)); }
}

@media (prefers-reduced-motion: reduce) {
  .boot-bar-fill { animation: none; width: 100%; }
}