:root {
  --bg: #e8f1e9;
  --bg-glow: #f5faf5;
  --panel: #fbfffb;
  --text: #223226;
  --branch: #4b7860;
  --accent: #3a8a62;
  --accent-soft: #d5f0df;
  --line: #c0d7c7;
  --cta-bg: #3f8b65;
  --cta-bg-hover: #337250;
  --cta-border: #2f6949;
  --neutral-btn-bg: #ebf5ee;
  --neutral-btn-hover: #ddeddf;
  --neutral-btn-border: #a1c2ac;
  --input-bg: #ffffff;
  --input-border: #9abca6;
  --suggestion-bg: #eef7f1;
  --suggestion-hover: #dfeddf;
  --suggestion-border: #a1c2ac;
  --rank-bg: #2f6b4c;
  --rank-border: #2f6b4c;
  --rank-text: #ffffff;
  --wiki-link: #2b7453;
  --wiki-image-border: #b3ccbc;
  --lang-bg: #eaf4ec;
  --lang-hover: #ddeddf;
  --lang-text: #2b3e30;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 15% 10%, var(--bg-glow), var(--bg) 45%);
  min-height: 100vh;
}

.app {
  width: min(960px, 92vw);
  margin: 0 auto;
  padding: 2rem 0 3rem;
  display: grid;
  gap: 1rem;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 2.8rem);
}

.hero-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
}

.hero-controls {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.hero p {
  margin: 0.4rem 0 0;
}

.dataset-debug {
  margin: 0.45rem 0 0;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--lang-text);
  background: var(--neutral-btn-bg);
  border: 1px solid var(--neutral-btn-border);
  border-radius: 8px;
  padding: 0.35rem 0.55rem;
  display: inline-block;
}

.new-mystery-btn {
  border: 1px solid var(--cta-border);
  background: var(--cta-bg);
  color: #fff;
  border-radius: 8px;
  padding: 0.35rem 0.6rem;
  font: inherit;
  cursor: pointer;
}

.new-mystery-btn:hover {
  background: var(--cta-bg-hover);
}

.new-mystery-btn.is-active {
  background: var(--accent);
  border-color: var(--accent);
}

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--neutral-btn-border);
  border-radius: 8px;
  overflow: hidden;
}

.lang-btn {
  border: 0;
  background: var(--lang-bg);
  color: var(--lang-text);
  padding: 0.35rem 0.6rem;
}

.lang-btn:hover {
  background: var(--lang-hover);
}

.lang-btn.is-active {
  background: var(--accent);
  color: #fff;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem;
  box-shadow: 0 10px 30px rgba(27, 64, 33, 0.16);
}

.panel h2 {
  margin-top: 0;
}

.row {
  display: flex;
  gap: 0.6rem;
}

.suggestions {
  margin-top: 0.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  min-height: 1.8rem;
}

.suggestion-btn {
  border: 1px solid var(--suggestion-border);
  background: var(--suggestion-bg);
  color: var(--text);
  border-radius: 999px;
  padding: 0.2rem 0.55rem;
  font: inherit;
  font-size: 0.9rem;
  cursor: pointer;
}

.suggestion-btn:hover {
  background: var(--suggestion-hover);
}

input,
button {
  font: inherit;
}

input {
  flex: 1;
  min-width: 0;
  padding: 0.55rem 0.65rem;
  border-radius: 8px;
  border: 1px solid var(--input-border);
  background: var(--input-bg);
  color: var(--text);
}

button {
  padding: 0.55rem 0.95rem;
  border: 1px solid var(--cta-border);
  background: var(--cta-bg);
  color: #fff;
  border-radius: 8px;
  cursor: pointer;
}

button:hover {
  background: var(--cta-bg-hover);
}

.feedback {
  min-height: 1.5rem;
  margin: 0.6rem 0 0;
}

.win-banner {
  margin: 0 0 0.6rem;
  padding: 0.45rem 0.6rem;
  border: 1px solid var(--accent);
  border-radius: 8px;
  background: var(--accent-soft);
  color: #1e4b36;
  font-weight: 700;
}

.tree-root {
  overflow-x: auto;
}

.tree,
.tree ul {
  list-style: none;
  margin: 0;
  padding-left: 1.35rem;
}

.tree li {
  margin: 0.25rem 0;
  position: relative;
  padding-left: 0.55rem;
}

.tree li::before {
  content: none;
}

.tree li::after {
  content: none;
}

.tree-row {
  position: relative;
  min-height: 1.6rem;
  display: flex;
  align-items: center;
}

.tree-row::before {
  content: "";
  position: absolute;
  left: -1.31rem;
  top: 50%;
  transform: translateY(-50%);
  width: 0.86rem;
  border-top: 2px solid var(--branch);
}

.tree li.has-prev > .tree-row::after {
  content: "";
  position: absolute;
  left: -1.31rem;
  top: 0;
  height: 50%;
  border-left: 2px solid var(--branch);
}

.tree li.has-next::before {
  content: "";
  position: absolute;
  left: -1.31rem;
  top: 50%;
  height: 1.35rem;
  border-left: 2px solid var(--branch);
}

.node {
  display: inline-block;
  padding: 0.25rem 0.55rem;
  border-radius: 8px;
  border: 1px solid var(--suggestion-border);
  background: var(--suggestion-bg);
}

.node.rank {
  background: var(--rank-bg);
  border-color: var(--rank-border);
  color: var(--rank-text);
}

.node.rank.closest {
  background: #bfe7ff;
  border-color: #7fc6ec;
  color: #12334a;
}

.node.guess {
  background: var(--input-bg);
}

.node.correct {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.guesses {
  margin: 0;
  padding-left: 1.1rem;
}

.guesses li {
  margin: 0.25rem 0;
}

.wiki-panel {
  margin-top: 0.2rem;
}

.wiki-meta {
  margin: 0.2rem 0 0.55rem;
  font-weight: 700;
}

.wiki-source {
  display: inline-block;
  margin: 0 0 0.55rem;
  padding: 0.12rem 0.5rem;
  border-radius: 999px;
  border: 1px solid #c6d6b5;
  background: #eef7e4;
  color: #264126;
  font-size: 0.78rem;
  font-weight: 700;
}

.wiki-source[data-source="live"] {
  border-color: #d8cb9a;
  background: #fff4cf;
  color: #5e4300;
}

.wiki-source[data-source="cache"] {
  border-color: #b8c9d8;
  background: #e8f1f8;
  color: #1f4057;
}

.wiki-source[data-source="local"] {
  border-color: #c6d6b5;
  background: #eef7e4;
  color: #264126;
}

.wiki-summary {
  margin: 0;
  line-height: 1.45;
}

.wiki-image {
  display: block;
  width: min(280px, 100%);
  height: auto;
  border-radius: 8px;
  margin: 0.2rem 0 0.65rem;
  border: 1px solid var(--wiki-image-border);
}

.wiki-link {
  display: inline-block;
  margin-top: 0.65rem;
  color: var(--wiki-link);
  text-decoration: underline;
}

.streaks {
  margin: 0.2rem 0 0.6rem;
}

.history {
  margin: 0;
  padding-left: 1.1rem;
}

.history li {
  margin: 0.2rem 0;
}

@media (max-width: 640px) {
  .hero-top {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero-controls {
    width: 100%;
  }

  .row {
    flex-direction: column;
  }

  .new-mystery-btn {
    width: 100%;
  }

  .lang-switch {
    width: 100%;
  }

  .lang-btn {
    flex: 1;
  }

  .row button {
    width: 100%;
  }
}