:root {
  --bg: #f5f6f8;
  --panel: #ffffff;
  --text: #1d2330;
  --muted: #5d6676;
  --border: #d8dce3;
  --accent: #2f6fdb;
  --ok: #1e8e4e;
  --err: #c0392b;
  --term-bg: #0f1420;
  --term-text: #d6dde8;
  --term-muted: #7d8aa0;
  --term-prompt: #7fd1ae;
  --term-err: #ff8a80;
  --radius: 10px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b0e14;
    --panel: #151a24;
    --text: #e6eaf2;
    --muted: #97a1b3;
    --border: #2a3142;
    --accent: #6ea8ff;
    --ok: #4cc38a;
    --err: #ff8a80;
  }
}

:root[data-theme="dark"] {
  --bg: #0b0e14;
  --panel: #151a24;
  --text: #e6eaf2;
  --muted: #97a1b3;
  --border: #2a3142;
  --accent: #6ea8ff;
  --ok: #4cc38a;
  --err: #ff8a80;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.top {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
  align-items: flex-end;
  padding: 20px 16px 12px;
  max-width: 1200px;
  margin: 0 auto;
}

.eyebrow { margin: 0; color: var(--muted); font-size: 13px; text-transform: uppercase; letter-spacing: .06em; }
h1 { margin: 2px 0 0; font-size: 24px; line-height: 1.2; }

.xp { min-width: 220px; flex: 0 1 280px; }
.xp-label { font-weight: 600; margin-bottom: 6px; font-variant-numeric: tabular-nums; }
.xp-bar { height: 10px; border-radius: 999px; background: var(--border); overflow: hidden; }
.xp-fill { height: 100%; width: 0; background: var(--ok); transition: width .3s ease; }

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 16px;
  padding: 0 16px 32px;
  max-width: 1200px;
  margin: 0 auto;
  align-items: start;
}

@media (max-width: 860px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  min-width: 0;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  font-size: 14px;
}

button {
  font: inherit;
  cursor: pointer;
  border-radius: 8px;
  padding: 8px 14px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
}
button.ghost { background: transparent; color: var(--accent); padding: 4px 10px; font-size: 13px; }
button:focus-visible, input:focus-visible, .output:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* Terminal */
.terminal-panel { display: flex; flex-direction: column; background: var(--term-bg); border-color: #222a3b; }
.terminal-panel .panel-head { color: var(--term-text); border-bottom-color: #222a3b; }
.terminal-panel .panel-head button.ghost { color: #9ec5ff; }

.output {
  margin: 0;
  padding: 14px;
  flex: 1;
  min-height: 320px;
  max-height: 60vh;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--term-text);
  font: 13.5px/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.output .cmd { color: var(--term-prompt); }
.output .err { color: var(--term-err); }
.output .sys { color: var(--term-muted); }
.output .done { color: #9be7b8; font-weight: 600; }

.prompt-line {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-top: 1px solid #222a3b;
  font: 13.5px ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.prompt-text { color: var(--term-prompt); white-space: nowrap; }
#cmd {
  flex: 1;
  min-width: 0;
  background: transparent;
  border: 0;
  color: var(--term-text);
  font: inherit;
  padding: 6px 0;
}
#cmd::placeholder { color: var(--term-muted); opacity: .7; }

/* Tasks */
.task-list { list-style: none; margin: 0; padding: 8px; display: grid; gap: 8px; }
.task {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
}
.task.done { border-color: var(--ok); }
.task-head { display: flex; justify-content: space-between; gap: 10px; align-items: baseline; }
.task-title { font-weight: 600; font-size: 15px; margin: 0; }
.task-xp { font-size: 13px; color: var(--muted); white-space: nowrap; font-variant-numeric: tabular-nums; }
.task.done .task-xp { color: var(--ok); }
.task-status { font-size: 13px; color: var(--muted); margin-top: 2px; }
.task.done .task-status { color: var(--ok); }
.task-brief { margin: 8px 0 0; color: var(--muted); font-size: 14px; }
.answer-form { display: flex; gap: 8px; margin-top: 10px; flex-wrap: wrap; }
.answer-form input {
  flex: 1;
  min-width: 140px;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font: inherit;
}
.answer-form .hint { width: 100%; margin: 0; font-size: 13px; color: var(--err); }

.foot {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px 24px;
  color: var(--muted);
  font-size: 13px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
}
.foot p { margin: 0; }

@media (max-width: 480px) {
  .output { min-height: 240px; }
  .top { padding-top: 16px; }
}