:root {
  --bg: #f7f5ef;
  --panel: #ffffff;
  --ink: #26241f;
  --muted: #7a756b;
  --line: #e2ddd1;
  --accent: #3a5a8c;
  --accent-ink: #2b4467;
  --hi: #ffd24a;
}

* { box-sizing: border-box; }

/* The `hidden` attribute must win over component `display` rules below
   (.overlay/.toolbar/.viewport/.dropzone all set an explicit display). */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  height: 100%;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
}

body { display: flex; flex-direction: column; height: 100vh; }

header {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.6rem 1rem;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  z-index: 5;
}

.brand {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}
.brand span { color: var(--accent); }

.toolbar {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex: 1;
}
.toolbar .sep {
  width: 1px;
  height: 22px;
  background: var(--line);
  margin: 0 0.35rem;
}

#search {
  flex: 0 1 260px;
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 0.9rem;
  outline: none;
}
#search:focus { border-color: var(--accent); }

button {
  font: inherit;
  font-size: 0.85rem;
  padding: 0.38rem 0.7rem;
  background: var(--panel);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s;
}
button:hover { background: #f0ece2; border-color: #cfc8ba; }
#download {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
#download:hover { background: var(--accent-ink); }

main#stage { position: relative; flex: 1; overflow: hidden; }

.dropzone {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}
.dropzone.dragover .drop-inner {
  border-color: var(--accent);
  background: #eef2f8;
}
.drop-inner {
  border: 2px dashed var(--line);
  border-radius: 16px;
  padding: 3rem 4rem;
  text-align: center;
  background: var(--panel);
  transition: border-color 0.15s, background 0.15s;
}
.drop-icon { font-size: 2.4rem; color: var(--accent); }
.drop-inner h1 { font-size: 1.3rem; margin: 0.6rem 0 0.2rem; }
.drop-inner p { color: var(--muted); margin: 0 0 1.4rem; font-size: 0.9rem; }
.drop-inner p.hint { font-size: 0.78rem; opacity: 0.8; margin: -0.9rem 0 1.4rem; }

.filebtn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 0.55rem 1.1rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.92rem;
}
.filebtn:hover { background: var(--accent-ink); }

.fmtrow {
  margin-top: 1.2rem;
  font-size: 0.85rem;
  color: var(--muted);
}
.fmtrow select {
  font: inherit;
  margin-left: 0.4rem;
  padding: 0.25rem 0.4rem;
  border: 1px solid var(--line);
  border-radius: 5px;
}

.viewport { position: absolute; inset: 0; }
.viewport svg { width: 100%; height: 100%; display: block; }

/* search highlight */
.node--hit polygon,
.node--hit path { stroke: var(--accent) !important; stroke-width: 3px !important; }
.node--current polygon:first-of-type { fill: var(--hi) !important; }

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  background: rgba(247, 245, 239, 0.82);
  backdrop-filter: blur(2px);
  z-index: 10;
  color: var(--muted);
}
.spinner {
  width: 38px;
  height: 38px;
  border: 4px solid var(--line);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

footer#status {
  padding: 0.4rem 1rem;
  background: var(--panel);
  border-top: 1px solid var(--line);
  font-size: 0.8rem;
  color: var(--muted);
}
footer#status.error { color: #b3261e; }