:root {
  --bg: #FBF3E4;
  --ink: #2D3142;
  --sub: #8a7f6a;
  --card: #ffffff;
  --line: #eadfc9;
  --primary: #FF8C42;
  --teal: #2EC4B6;
  --yellow: #FFC53D;
  --danger: #b02a2a;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  color: var(--ink);
  background: var(--bg);
  background-image: radial-gradient(#f0e0c0 1px, transparent 1px);
  background-size: 22px 22px;
}
.hidden { display: none !important; }

/* ---------- 顶栏 ---------- */
#topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 18px;
  background: rgba(255, 252, 246, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 2px solid var(--line);
}
.logo { font-size: 20px; font-weight: 800; cursor: pointer; user-select: none; }
.stats { display: flex; gap: 8px; flex-wrap: wrap; }
.stat {
  background: #fff; border: 1.5px solid var(--line); border-radius: 999px;
  padding: 4px 12px; font-size: 13px; white-space: nowrap;
}
.stat b { color: var(--primary); }

/* ---------- 章节地图 ---------- */
#chapterList { max-width: 1080px; margin: 0 auto; padding: 18px 14px 60px; }
.warn {
  background: #fff3e3; border: 1.5px solid #f5d9b0; border-radius: 12px;
  padding: 10px 14px; margin-bottom: 14px; font-size: 13.5px;
}
.chapter-card {
  background: var(--card); border: 2px solid #f0e4cf; border-radius: 20px;
  padding: 16px 18px; margin-bottom: 18px;
  box-shadow: 0 3px 10px rgba(120, 90, 40, 0.07);
}
.ch-head { display: flex; align-items: center; gap: 12px; }
.ch-icon { font-size: 36px; }
.ch-head h2 { margin: 0; font-size: 19px; }
.ch-sub { color: var(--sub); font-size: 13px; margin-top: 3px; }
.lv-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 10px; margin-top: 12px;
}
.lv-node {
  border-radius: 14px; border: 2px solid var(--line); background: #fffdf8;
  padding: 10px; text-align: left; cursor: pointer;
  display: flex; flex-direction: column; gap: 4px;
  transition: transform .12s ease, box-shadow .12s ease;
  font-family: inherit; color: inherit;
}
.lv-node:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 4px 10px rgba(120,90,40,.12); }
.lv-node:disabled { cursor: not-allowed; }
.lv-node.locked { opacity: .55; background: #f4f0e8; }
.lv-node.done { border-color: var(--teal); background: #effcf9; }
.lv-node.boss { border-color: var(--primary); background: #fff6ee; }
.lv-node.boss.locked { background: #f4f0e8; }
.lv-no { font-weight: 800; font-size: 15px; }
.lv-name { font-size: 13px; line-height: 1.35; }
.lv-stars { font-size: 12px; letter-spacing: 2px; }

/* ---------- 关卡页 ---------- */
.level-head {
  display: flex; align-items: center; gap: 12px;
  max-width: 1240px; margin: 0 auto; padding: 14px 16px 0;
}
.level-head h2 { margin: 0; font-size: 20px; }
#btnBack {
  border: 1.5px solid #e3d5ba; background: #fff; border-radius: 10px;
  padding: 6px 12px; cursor: pointer; font-size: 13.5px;
}
#btnBack:hover { background: #fff6ea; }
.oj-badge {
  background: #eef4ff; color: #35599c; border: 1px solid #cdd9f5;
  border-radius: 999px; padding: 3px 10px; font-size: 12px; white-space: nowrap;
}
.level-body {
  display: grid; grid-template-columns: 5fr 6fr; gap: 16px;
  max-width: 1240px; margin: 0 auto; padding: 14px 16px 60px;
}
@media (max-width: 980px) { .level-body { grid-template-columns: 1fr; } }
.card {
  background: var(--card); border: 2px solid #f0e4cf; border-radius: 18px;
  padding: 16px 18px; box-shadow: 0 3px 10px rgba(120, 90, 40, 0.07);
}
.prob-card h3 { font-size: 15px; margin: 16px 0 6px; }
.prob-card h3:first-child { margin-top: 0; }
#lvStatement { white-space: pre-wrap; line-height: 1.75; font-size: 14.5px; }
#lvSpecs div { margin: 4px 0; font-size: 14px; }
.lv-source { margin-top: 14px; color: var(--sub); font-size: 12px; }
.sample { margin: 8px 0; border: 1.5px dashed var(--line); border-radius: 12px; padding: 8px 10px; }
.s-t { font-size: 12.5px; color: var(--sub); margin-bottom: 4px; }
.s-io { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
@media (max-width: 560px) { .s-io { grid-template-columns: 1fr; } }
.s-cap { font-size: 12px; color: var(--sub); margin-bottom: 3px; }

/* 代码块（样例/错误） */
pre {
  background: #2b2b33; color: #e8e6f0; border-radius: 10px;
  padding: 9px 12px; font-size: 12.5px; line-height: 1.5;
  overflow: auto; margin: 0; white-space: pre;
}
pre.cerr { color: #ff9c9c; }
#lvTemplate { background: #f6f1e6; color: #5c5344; max-height: 220px; overflow: auto; }

/* 目标 / 提示 */
#lvGoals { margin: 4px 0 0; padding-left: 20px; font-size: 13.5px; line-height: 1.8; }
.hint-btn {
  margin: 4px 6px 4px 0; padding: 6px 14px; border-radius: 999px;
  border: 2px dashed #d9c9a8; background: #fff; cursor: pointer;
  font-size: 13px; font-family: inherit;
}
.hint-btn:hover { background: #fff9e8; border-color: #e8b94a; }
.hint.shown {
  background: #fff9e8; border: 1.5px solid #f0dfae; border-radius: 10px;
  padding: 8px 10px; margin: 6px 0; font-size: 13.5px; white-space: pre-wrap;
}

/* 编辑器 */
.editor-wrap {
  display: flex; border: 1.5px solid #e8dcc8; border-radius: 12px;
  overflow: hidden; background: #fff;
}
#gutter {
  width: 42px; flex: none; padding: 10px 6px; text-align: right;
  color: #b9a98a; background: #faf6ee;
  font: 12.5px/1.55 ui-monospace, Consolas, monospace;
  overflow: hidden; user-select: none; white-space: pre;
}
#code {
  flex: 1; min-height: 340px; border: 0; outline: 0; resize: vertical;
  padding: 10px 12px; margin: 0;
  font: 12.5px/1.55 ui-monospace, Consolas, monospace; background: #fff;
  white-space: pre; overflow: auto; tab-size: 4;
}
.btn-row { display: flex; gap: 10px; margin-top: 10px; }
button.primary {
  background: var(--primary); color: #fff; font-weight: 800;
  border-radius: 12px; padding: 10px 24px; border: 0; cursor: pointer;
  font-size: 15px; font-family: inherit;
}
button.primary:hover { filter: brightness(1.07); }
#btnReset { border: 1.5px solid #e3d5ba; background: #fff; border-radius: 12px; padding: 8px 16px; cursor: pointer; font-family: inherit; }
.console { margin-top: 12px; min-height: 30px; }

/* 判题结果 */
.verdict { border-radius: 12px; padding: 10px 14px; font-weight: 800; margin: 8px 0; font-size: 14.5px; }
.verdict.run { background: #eef1f6; color: #5a6478; font-weight: 600; }
.verdict.ac { background: #e7f8ef; color: #1d7a45; }
.verdict.wa { background: #fff3e3; color: #b25e09; }
.verdict.ce { background: #fdecec; color: var(--danger); font-weight: 600; }
.verdict.tle { background: #f0ebff; color: #6b46c1; }
.verdict.re { background: #ffe9f2; color: #c2255c; }
.ac-meta { color: var(--sub); font-size: 13.5px; margin: 6px 2px; }
.case { font-size: 13px; color: var(--sub); margin: 4px 2px 8px; }

/* 选择题 */
fieldset { border: 1.5px solid var(--line); border-radius: 12px; margin: 10px 0; padding: 10px 12px; }
legend { font-weight: 800; font-size: 13.5px; padding: 0 6px; }
.q-text { line-height: 1.65; font-size: 14px; margin-bottom: 6px; white-space: pre-wrap; }
fieldset label { display: block; margin: 5px 0; font-size: 13.5px; cursor: pointer; }
fieldset input { margin-right: 7px; }
#btnQuiz { margin-top: 8px; }
.q-res { font-size: 13px; margin: 5px 0; line-height: 1.6; white-space: pre-wrap; }
.q-res.ok { color: #1d7a45; }
.q-res.bad { color: var(--danger); }

/* 彩带 */
#confetti { pointer-events: none; }
#confetti i {
  position: fixed; top: -24px; border-radius: 2px; z-index: 99;
  animation: fall linear forwards;
}
@keyframes fall { to { transform: translateY(106vh) rotate(720deg); } }