:root {
  --bg: #0b0f0c; --win: #0d1310; --bar: #13201a; --line: #1f3a27;
  --fg: #c9f7d4; --dim: #5f8a6a; --acc: #4dff88; --err: #ff7b72; --dir: #6cb6ff;
  --glow: rgba(77,255,136,.45); --glow-soft: rgba(77,255,136,.08);
  --mono: 'JetBrains Mono', ui-monospace, Consolas, monospace;
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.7 var(--mono);
  background-image: radial-gradient(ellipse at 50% 0, var(--glow-soft), transparent 60%); }
body::after { content: ""; position: fixed; inset: 0; pointer-events: none;
  background: repeating-linear-gradient(0deg, rgba(0,0,0,.16) 0 1px, transparent 1px 3px); }

.win { max-width: 820px; height: calc(100% - 64px); margin: 32px auto; display: flex; flex-direction: column;
  background: var(--win); border: 1px solid var(--line); border-radius: 12px; overflow: hidden;
  box-shadow: 0 0 80px var(--glow-soft), 0 30px 60px rgba(0,0,0,.5); }
.bar { background: var(--bar); padding: 10px 14px; display: flex; gap: 8px; align-items: center; color: var(--dim); font-size: 12px; }
.bar i { width: 12px; height: 12px; border-radius: 50%; }
.bar i:nth-child(1) { background: #ff5f56; } .bar i:nth-child(2) { background: #ffbd2e; } .bar i:nth-child(3) { background: #27c93f; }
.bar span { margin-left: 8px; }

.screen { flex: 1; overflow: auto; padding: 28px 32px 8px; }
.screen > div { white-space: pre-wrap; word-break: break-word; }
.logo { color: var(--acc); text-shadow: 0 0 10px var(--glow); font-size: clamp(7px, 1.9vw, 14px); line-height: 1.15; margin: 0 0 4px; }
.tag { color: var(--dim); margin-bottom: 22px; }
.cmd { color: var(--fg); margin-top: 14px; }
.cmd b { color: var(--acc); font-weight: 400; }
.out { color: #e8fff0; }
.dim { color: var(--dim); }
.err { color: var(--err); }
a { color: var(--acc); }
.cursor { display: inline-block; width: .6em; height: 1.1em; background: var(--acc); vertical-align: text-bottom; animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

.menu { display: flex; flex-wrap: wrap; gap: 10px; padding: 14px 32px; border-top: 1px solid var(--line); }
.menu button { background: transparent; border: 1px solid var(--line); color: var(--acc); font: 15px var(--mono);
  padding: 8px 16px; border-radius: 6px; cursor: pointer; transition: background .15s, border-color .15s; }
.menu button::before { content: "> "; color: var(--dim); }
.menu button:hover, .menu button:focus-visible { background: var(--glow-soft); border-color: var(--acc); outline: none; }

.input { display: flex; align-items: center; gap: 10px; padding: 0 32px 18px; cursor: text; }
.prompt { color: var(--acc); }
.input input { flex: 1; min-width: 0; background: none; border: 0; outline: 0; color: #fff; font: inherit; caret-color: var(--acc); }
.input input::placeholder { color: #2f4a37; }

.d { color: var(--dir); } .x { color: var(--acc); font-weight: 700; } .ok { color: var(--acc); }
.boot { color: var(--fg); }
.menu button:disabled { opacity: .4; cursor: default; }

/* sudo / su */
body.root {
  --bg: #110909; --win: #140c0c; --bar: #241212; --line: #4a2020;
  --fg: #ffd2cc; --dim: #9a5f5a; --acc: #ff4d4d; --glow: rgba(255,77,77,.5); --glow-soft: rgba(255,77,77,.09);
}
body, .win, .bar, .menu button { transition: background-color .4s, border-color .4s, color .4s; }

/* shutdown / halt */
body.off { background: #000; background-image: none; cursor: none; }
body.off::after { display: none; }

.noscript { position: fixed; inset: auto 0 0 0; text-align: center; color: var(--fg); }

@media (max-width: 640px) {
  body { font-size: 14px; }
  .win { margin: 0; height: 100%; border-radius: 0; border: 0; }
  .screen { padding: 18px 16px 6px; }
  .menu { padding: 12px 16px; gap: 8px; }
  .menu button { flex: 1 1 40%; padding: 10px; }
  .input { padding: 0 16px 14px; }
}
@media (prefers-reduced-motion: reduce) { .cursor { animation: none; } }