/* ============================================================
   DHDMS-OS — 桌面/窗口/任务栏/开始菜单基础样式
   深色基底 + CSS 变量（主题见 themes.css）
   ============================================================ */

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

html, body {
  height: 100%;
  overflow: hidden;
  font-family: "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
}

button { font-family: inherit; cursor: pointer; }
input, textarea, select { font-family: inherit; }

/* ---------------- 登录页 ---------------- */
.login-screen[hidden] { display: none; }
.login-screen {
  position: fixed; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background:
    radial-gradient(1200px 600px at 20% 10%, rgba(0,212,255,0.12), transparent 60%),
    radial-gradient(1000px 700px at 85% 90%, rgba(123,47,247,0.14), transparent 60%),
    var(--bg);
  z-index: 10;
}
.login-grid-bg {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.045) 1px, transparent 1px);
  background-size: 42px 42px;
  -webkit-mask-image: radial-gradient(ellipse at center, #000 0%, transparent 75%);
  mask-image: radial-gradient(ellipse at center, #000 0%, transparent 75%);
}
.login-card {
  position: relative;
  width: 400px; max-width: 92vw;
  padding: 44px 40px 32px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 24px 70px rgba(0,0,0,0.45);
  text-align: center;
}
.login-logo { margin-bottom: 14px; }
.login-title {
  font-size: 28px; font-weight: 700; letter-spacing: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.login-sub { margin: 8px 0 28px; font-size: 13px; color: var(--muted); }
.login-form { display: flex; flex-direction: column; gap: 10px; text-align: left; }
.login-form label { font-size: 12px; color: var(--muted); }
.login-form input {
  width: 100%; padding: 11px 13px;
  background: var(--input-bg); color: var(--text);
  border: 1px solid var(--border); border-radius: 8px;
  outline: none; transition: border-color .2s, box-shadow .2s;
}
.login-form input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }
.login-form button {
  margin-top: 6px; padding: 11px 0;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  color: #fff; border: none; border-radius: 8px;
  font-size: 15px; font-weight: 600; letter-spacing: 6px;
  transition: filter .2s, transform .1s;
}
.login-form button:hover { filter: brightness(1.12); }
.login-form button:active { transform: scale(0.98); }
.login-error {
  padding: 8px 12px; font-size: 12px; color: var(--danger);
  background: color-mix(in srgb, var(--danger) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--danger) 45%, transparent);
  border-radius: 8px;
}
.login-hint { margin-top: 14px; font-size: 11px; color: var(--muted); line-height: 1.6; }

/* ---------------- 桌面 ---------------- */
.desktop-root {
  position: fixed; inset: 0;
  display: flex; flex-direction: column;
  background: var(--bg);
  overflow: hidden;
}
.desktop-wallpaper {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(1400px 800px at 15% 15%, rgba(0,212,255,0.10), transparent 55%),
    radial-gradient(1200px 900px at 85% 80%, rgba(123,47,247,0.12), transparent 55%),
    linear-gradient(160deg, var(--bg) 0%, color-mix(in srgb, var(--bg) 60%, #0b1026) 100%);
}
.desktop-wallpaper::after {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(ellipse at 50% 45%, #000 30%, transparent 90%);
  mask-image: radial-gradient(ellipse at 50% 45%, #000 30%, transparent 90%);
}
.desktop-icons {
  position: absolute; inset: 0; z-index: 1;
  display: grid;
  grid-template-columns: repeat(10, 92px);
  grid-template-rows: repeat(5, auto);
  justify-content: center;
  align-content: center;
  padding: 14px 10px 70px;
  gap: 8px 10px;
  overflow: auto;
}
.desktop-icon {
  width: 86px; padding: 10px 4px 8px;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  border: 1px solid transparent; border-radius: 10px;
  color: var(--text); text-decoration: none;
  user-select: none; cursor: default;
  transition: background .15s, border-color .15s;
}
.desktop-icon:hover { background: var(--hover-bg); border-color: var(--border); }
.desktop-icon.selected { background: var(--accent-glow); border-color: var(--accent); }
.desktop-icon .dicon {
  width: 46px; height: 46px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 12px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 28%, var(--panel)), color-mix(in srgb, var(--accent2) 22%, var(--panel)));
  border: 1px solid var(--border);
  box-shadow: 0 4px 14px rgba(0,0,0,0.35);
}
.desktop-icon .dicon svg { width: 26px; height: 26px; }
.desktop-icon .dlabel {
  font-size: 11px; line-height: 1.3; text-align: center;
  text-shadow: 0 1px 3px rgba(0,0,0,0.8);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}

/* ---------------- 窗口 ---------------- */
.windows-layer { position: absolute; inset: 0; z-index: 2; overflow: hidden; }
.windows-layer:empty { pointer-events: none; }

.os-window {
  position: absolute;
  min-width: 320px; min-height: 200px;
  display: flex; flex-direction: column;
  background: var(--window-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 18px 50px rgba(0,0,0,0.5);
  overflow: hidden;
  transition: box-shadow .2s;
}
.os-window.focused {
  border-color: color-mix(in srgb, var(--accent) 65%, var(--border));
  box-shadow: 0 20px 60px rgba(0,0,0,0.6), 0 0 0 1px var(--accent-glow);
}
.os-window.minimized { display: none; }
.os-window.maximized {
  border-radius: 0;
  border-left: none; border-right: none; border-bottom: none;
}
.win-titlebar {
  height: 38px; flex: 0 0 38px;
  display: flex; align-items: center;
  padding: 0 4px 0 12px;
  background: var(--titlebar-bg);
  border-bottom: 1px solid var(--border);
  user-select: none;
  cursor: default;
}
.os-window.focused .win-titlebar { background: var(--titlebar-bg-active); }
.win-title { flex: 1; font-size: 12.5px; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.win-title .win-app-icon { margin-right: 6px; vertical-align: -2px; }
.win-controls { display: flex; gap: 2px; }
.win-btn {
  width: 34px; height: 28px;
  border: none; border-radius: 6px;
  background: transparent; color: var(--text);
  font-size: 13px; line-height: 1;
  transition: background .15s;
}
.win-btn:hover { background: var(--hover-bg); }
.win-btn.win-close:hover { background: var(--danger); color: #fff; }
.win-body { flex: 1; min-height: 0; position: relative; overflow: hidden; }
.win-body iframe {
  width: 100%; height: 100%; border: none;
  background: var(--window-bg);
}
.win-placeholder {
  height: 100%; padding: 28px;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px;
  text-align: center; color: var(--muted);
}
.win-placeholder .ph-icon { font-size: 42px; opacity: .6; }
.win-placeholder .ph-title { font-size: 16px; color: var(--text); }
.win-placeholder .ph-desc { font-size: 12px; max-width: 420px; line-height: 1.7; }
.win-placeholder .ph-badge {
  margin-top: 6px; padding: 4px 12px;
  font-size: 11px; border-radius: 999px;
  background: var(--accent-glow); color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 45%, transparent);
}

.win-resize-handle {
  position: absolute; width: 12px; height: 12px; z-index: 5;
}
.rh-nw { top: -2px; left: -2px; cursor: nwse-resize; }
.rh-ne { top: -2px; right: -2px; cursor: nesw-resize; }
.rh-sw { bottom: -2px; left: -2px; cursor: nesw-resize; }
.rh-se { bottom: -2px; right: -2px; cursor: nwse-resize; }
.rh-n { top: -2px; left: 12px; right: 12px; width: auto; height: 6px; cursor: ns-resize; }
.rh-s { bottom: -2px; left: 12px; right: 12px; width: auto; height: 6px; cursor: ns-resize; }
.rh-e { right: -2px; top: 12px; bottom: 12px; height: auto; width: 6px; cursor: ew-resize; }
.rh-w { left: -2px; top: 12px; bottom: 12px; height: auto; width: 6px; cursor: ew-resize; }

/* ---------------- 任务栏 ---------------- */
.taskbar {
  position: relative; z-index: 100;
  margin-top: auto;
  height: 48px; flex: 0 0 48px;
  display: flex; align-items: center;
  padding: 0 10px; gap: 8px;
  background: var(--taskbar-bg);
  border-top: 1px solid var(--border);
  backdrop-filter: blur(10px);
}
.taskbar-start {
  height: 34px; padding: 0 16px;
  border: none; border-radius: 8px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  color: #fff; font-size: 13px; font-weight: 700; letter-spacing: 1px;
  transition: filter .2s;
}
.taskbar-start:hover { filter: brightness(1.15); }
.taskbar-start.active { filter: brightness(1.2); box-shadow: 0 0 0 2px var(--accent-glow); }
.taskbar-windows { flex: 1; display: flex; gap: 6px; overflow: hidden; }
.taskbar-item {
  height: 34px; min-width: 42px; max-width: 190px;
  display: flex; align-items: center; gap: 7px;
  padding: 0 12px;
  background: var(--hover-bg);
  border: 1px solid transparent; border-radius: 8px;
  color: var(--text); font-size: 12px;
  overflow: hidden; white-space: nowrap;
  transition: background .15s, border-color .15s;
}
.taskbar-item:hover { background: var(--titlebar-bg-active); }
.taskbar-item.active { border-color: var(--accent); background: var(--accent-glow); }
.taskbar-item .tbi-icon { flex: 0 0 auto; }
.taskbar-item .tbi-label { overflow: hidden; text-overflow: ellipsis; }
.taskbar-right { display: flex; align-items: center; gap: 12px; }
.tray-status { display: flex; gap: 6px; align-items: center; }
.tray-dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--muted);
  box-shadow: 0 0 6px transparent;
}
.tray-dot.ok { background: #2ecc71; box-shadow: 0 0 6px rgba(46,204,113,0.7); }
.tray-dot.warn { background: #f1c40f; box-shadow: 0 0 6px rgba(241,196,15,0.7); }
.tray-dot.err { background: #e74c3c; box-shadow: 0 0 6px rgba(231,76,60,0.7); }
.taskbar-clock { font-size: 12px; color: var(--text); font-variant-numeric: tabular-nums; }

/* ---------------- 开始菜单 ---------------- */
.start-menu[hidden] { display: none; }
.start-menu {
  position: absolute; left: 10px; bottom: 56px; z-index: 200;
  width: 620px; max-width: 94vw; height: 480px; max-height: 76vh;
  display: flex;
  background: var(--window-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: 0 26px 70px rgba(0,0,0,0.55);
  overflow: hidden;
}
.start-left {
  width: 68%; padding: 16px;
  display: flex; flex-direction: column; gap: 12px;
  border-right: 1px solid var(--border);
  overflow-y: auto;
}
.start-brand { display: flex; align-items: center; gap: 10px; padding: 4px 6px 10px; border-bottom: 1px solid var(--border); }
.start-brand-name { font-size: 16px; font-weight: 700; letter-spacing: 1px; }
.start-brand-sub { font-size: 11px; color: var(--muted); }
.start-apps { flex: 1; display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; align-content: start; }
.start-app-item {
  display: flex; align-items: center; gap: 9px;
  padding: 9px 10px;
  border: 1px solid transparent; border-radius: 9px;
  background: transparent; color: var(--text);
  text-align: left; font-size: 12px;
  transition: background .15s, border-color .15s;
}
.start-app-item:hover { background: var(--hover-bg); border-color: var(--border); }
.start-app-item .sai-icon {
  width: 32px; height: 32px; flex: 0 0 32px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 8px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 26%, var(--panel)), color-mix(in srgb, var(--accent2) 20%, var(--panel)));
  border: 1px solid var(--border);
}
.start-app-item .sai-icon svg { width: 18px; height: 18px; }
.start-app-item .sai-name { font-weight: 600; }
.start-app-item .sai-desc { font-size: 10px; color: var(--muted); margin-top: 2px; }
.start-right {
  width: 32%; padding: 16px;
  display: flex; flex-direction: column; gap: 14px;
  background: color-mix(in srgb, var(--bg) 55%, transparent);
}
.start-search input {
  width: 100%; padding: 9px 12px;
  background: var(--input-bg); color: var(--text);
  border: 1px solid var(--border); border-radius: 8px;
  outline: none;
}
.start-search input:focus { border-color: var(--accent); }
.start-quick { display: flex; flex-direction: column; gap: 6px; }
.start-action {
  padding: 9px 12px;
  border: 1px solid var(--border); border-radius: 8px;
  background: var(--panel); color: var(--text);
  text-align: left; font-size: 12.5px;
  transition: background .15s, border-color .15s;
}
.start-action:hover { background: var(--hover-bg); border-color: var(--accent); }
.start-meta { margin-top: auto; font-size: 10.5px; color: var(--muted); line-height: 1.7; }

/* ---------------- 右键菜单 ---------------- */
.context-menu {
  position: fixed; z-index: 300; min-width: 170px;
  padding: 5px;
  background: var(--window-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 12px 36px rgba(0,0,0,0.5);
}
.context-menu button {
  display: block; width: 100%; padding: 8px 12px;
  border: none; border-radius: 7px;
  background: transparent; color: var(--text);
  text-align: left; font-size: 12.5px;
}
.context-menu button:hover { background: var(--hover-bg); }
.context-menu hr { margin: 5px 6px; border: none; border-top: 1px solid var(--border); }

/* ---------------- 通用工具类 ---------------- */
.hidden { display: none !important; }
::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-thumb { background: color-mix(in srgb, var(--muted) 45%, transparent); border-radius: 5px; }
::-webkit-scrollbar-track { background: transparent; }

/* ---------------- 响应式（移动端/窄视口） ---------------- */
@media (max-width: 1024px) {
  .desktop-icons { grid-template-columns: repeat(6, 92px); grid-template-rows: repeat(9, auto); padding: 10px 8px 60px; gap: 6px 8px; }
}
@media (max-width: 700px) {
  .desktop-icons { grid-template-columns: repeat(4, 84px); grid-template-rows: repeat(13, auto); padding: 8px 4px 56px; gap: 4px 6px; }
  .desktop-icon { width: 80px; padding: 8px 2px 6px; }
  .desktop-icon .dicon { width: 40px; height: 40px; }
  .desktop-icon .dicon svg { width: 22px; height: 22px; }
  .taskbar { height: 44px; flex-basis: 44px; padding: 0 6px; gap: 6px; }
  .taskbar-start { padding: 0 10px; font-size: 12px; }
  .os-window { min-width: 0; width: calc(100vw - 12px) !important; }
}

/* ---------------- Desktop Folder ---------------- */
.desktop-icon.folder { border-style: dashed; }
.desktop-icon.folder .dicon {
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 42%, var(--panel)), color-mix(in srgb, var(--accent2) 32%, var(--panel)));
  border-style: dashed;
}
.desktop-icon.folder .dicon svg { width: 30px; height: 30px; }
.desktop-icon.dragging { opacity: .55; }
.desktop-icon.drop-target { border-color: var(--accent); background: var(--accent-glow); }
.folder-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(96px, 1fr));
  gap: 10px; padding: 16px; overflow: auto;
  width: 100%; height: 100%; box-sizing: border-box;
  align-content: start;
}
.folder-app {
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  padding: 12px 6px; border: 1px solid transparent; border-radius: 10px;
  cursor: default; user-select: none; text-align: center;
  transition: background .15s, border-color .15s;
}
.folder-app:hover { background: var(--hover-bg); border-color: var(--border); }
.folder-app .dicon {
  width: 46px; height: 46px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 12px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 28%, var(--panel)), color-mix(in srgb, var(--accent2) 22%, var(--panel)));
  border: 1px solid var(--border);
}
.folder-app .dicon svg { width: 30px; height: 30px; }
.folder-app .dlabel {
  font-size: 11px; line-height: 1.3; text-align: center;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
@media (max-width: 700px) {
  .folder-grid { grid-template-columns: repeat(auto-fill, minmax(80px, 1fr)); gap: 6px; padding: 10px; }
  .folder-app .dicon { width: 40px; height: 40px; }
  .folder-app .dicon svg { width: 24px; height: 24px; }
}