:root {
  --bg: #0b0e17;
  --bg2: #111627;
  --panel: #141b30;
  --text: #e8ecf8;
  --muted: #8b93b0;
  --accent: #8b7cf6;
  --gold: #ffd166;
  --danger: #ff6b6b;
  --border: #232c4a;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
  overflow: hidden;
}

body { display: flex; flex-direction: column; }

/* ---------- top bar ---------- */
.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 17px;
  white-space: nowrap;
}

.brand .logo { display: inline-flex; width: 26px; height: 26px; flex: none; }
.logo svg { display: block; }

.search {
  display: flex;
  flex: 1;
  max-width: 520px;
  margin-left: auto;
  gap: 8px;
  min-width: 0;
}

.searchWrap {
  position: relative;
  flex: 1;
  min-width: 0;
  display: flex;
}

.search input {
  flex: 1;
  min-width: 0;
  width: 100%;
  padding: 9px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  outline: none;
}

.search input:focus { border-color: var(--accent); }

#suggest {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  z-index: 60;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.5);
}

#suggest.hidden { display: none; }

.suggest-item {
  display: block;
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  border-radius: 0;
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  cursor: pointer;
}

.suggest-item:hover,
.suggest-item.active { background: rgba(139, 124, 246, 0.18); }

button {
  padding: 9px 16px;
  border-radius: 999px;
  border: none;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

button:hover { filter: brightness(1.12); }

button.ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  white-space: nowrap;
}

/* ---------- stage ---------- */
.stage {
  position: relative;
  flex: 1;
  min-height: 0;
}

#graph {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: grab;
}

#hint {
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 12px;
  color: var(--muted);
  background: rgba(11, 14, 23, 0.7);
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  pointer-events: none;
  white-space: nowrap;
  max-width: 94vw;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ---------- side panel ---------- */
#panel {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 320px;
  max-width: calc(100vw - 24px);
  max-height: calc(100% - 24px);
  overflow-y: auto;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
  z-index: 5;
}

#panel.hidden { display: none; }

#panelClose {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 34px;
  height: 34px;
  padding: 0;
  border-radius: 50%;
  background: rgba(13, 13, 32, 0.72);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.22);
  color: #fff;
  font-size: 15px;
  z-index: 2;
}

#panelThumb {
  width: 100%;
  border-radius: 10px;
  margin-bottom: 12px;
  display: block;
}

#panelThumb.hidden { display: none; }

#panelTitle {
  margin: 0 28px 4px 0;
  font-size: 20px;
  line-height: 1.25;
}

#panel .meta {
  color: var(--muted);
  font-size: 12px;
  margin: 0 0 10px;
}

#panelSummary {
  font-size: 14px;
  line-height: 1.55;
  color: #c9d0e8;
  margin: 0 0 14px;
}

#panelLink {
  color: var(--accent);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

#panelLink:hover { text-decoration: underline; }

/* ---------- bottom bar ---------- */
.bottombar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 16px;
  background: var(--bg2);
  border-top: 1px solid var(--border);
  min-height: 48px;
  z-index: 10;
}

#trail {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1;
  overflow-x: auto;
  scrollbar-width: none;
  font-size: 13px;
}

#trail::-webkit-scrollbar { display: none; }

.crumb {
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
}

.crumb.current {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.crumb-sep { color: var(--muted); }

#stats {
  color: var(--muted);
  font-size: 12px;
  white-space: nowrap;
}

/* ---------- toast ---------- */
#toast {
  position: fixed;
  bottom: 70px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 14px;
  z-index: 50;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
  max-width: 90vw;
  text-align: center;
}

#toast.hidden { display: none; }

@media (max-width: 640px) {
  .topbar { flex-wrap: wrap; row-gap: 10px; }
  .search { order: 2; flex-basis: 100%; max-width: none; margin-left: 0; }
  #randomBtn .btnLabel { display: none; }
  #randomBtn { padding: 9px 12px; }
  #panel {
    top: auto;
    bottom: 12px;
    right: 12px;
    left: 12px;
    width: auto;
    max-height: 45%;
  }
  #hint { display: none; }
}