:root {
  --bg: #f7f7f8;
  --panel: #ffffff;
  --text: #1a1a1a;
  --muted: #6b7280;
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --accent: #2563eb;
  --accent-soft: #eff6ff;
}
* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
}
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 20px 60px;
}

.topnav { margin-bottom: 16px; }
.back-link {
  display: inline-block;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
}
.back-link:hover { color: var(--accent); }

.page-header { margin-bottom: 24px; }
.page-header h1 {
  font-size: 24px;
  font-weight: 600;
  margin: 0 0 4px;
  letter-spacing: -0.01em;
  cursor: default;
  width: fit-content;
  max-width: 100%;
}
.subtitle {
  color: var(--muted);
  font-size: 14px;
  margin: 0;
  line-height: 1.6;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font: inherit;
  font-size: 14px;
  padding: 7px 12px;
  border-radius: 6px;
  border: 1px solid var(--border-strong);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  text-decoration: none;
  transition: background 0.12s, border-color 0.12s;
}
.btn:hover { background: #f3f4f6; border-color: #9ca3af; }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn-secondary span[aria-hidden] { color: var(--accent); font-size: 14px; }

.panels {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
@media (min-width: 900px) {
  .panels { flex-direction: row; }
  .panels > .panel {
    flex: 1 1 0;
    min-width: 0;
    margin-bottom: 0;
  }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px;
  margin-bottom: 16px;
}
.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
  flex-wrap: wrap;
  min-height: 34px;       /* matches button height so both panels align */
}
.field-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0;
}
.header-controls {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.textarea-wrap { position: relative; }
.textarea-wrap textarea,
.textarea-wrap .input-overlay {
  width: 100%;
  min-height: 110px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 16px;
  line-height: 1.55;
  font-weight: 400;
  resize: none;
  background: var(--bg);
  color: var(--text);
  white-space: pre-wrap;
  word-break: normal;
  overflow-wrap: break-word;
  margin: 0;
}
.textarea-wrap textarea { display: block; resize: none; overflow: hidden; }
.textarea-wrap textarea:focus {
  outline: none;
  border-color: var(--accent);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}
.textarea-wrap .input-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  color: transparent;
  background: transparent;
  border-color: transparent;
  overflow: hidden;
}
.textarea-wrap .input-overlay .word {
  /* clicks must fall through to the textarea so the caret positions normally;
     hover linking is handled in JS via mousemove + bounding rects */
  pointer-events: none;
  border-radius: 2px;
}
@media (min-width: 900px) {
  .textarea-wrap textarea,
  .textarea-wrap .input-overlay { font-size: 18px; min-height: 160px; }
  .output-box { font-size: 18px; }
}

.status-line { min-height: 18px; margin-top: 8px; }
.status { font-size: 12px; color: var(--muted); }

.output-box {
  min-height: 110px;
  padding: 12px;
  background: var(--accent-soft);
  border: 1px solid #dbeafe;
  border-radius: 8px;
  font-size: 16px;
  line-height: 1.55;
  word-break: normal;
  overflow-wrap: break-word;
  white-space: pre-wrap;
}
.output-box.empty {
  color: var(--muted);
  background: var(--bg);
  border-style: dashed;
}
@media (min-width: 900px) {
  .output-box { min-height: 160px; }
}

.word { border-radius: 2px; }
.word.swapped, .word.kept, .word.unchanged { cursor: pointer; }
.output-box .word:hover,
.textarea-wrap .word:hover { background: rgba(37, 99, 235, 0.10); }
.word.unchanged {
  border-bottom: 1px dashed var(--muted);
}
.word.pending {
  color: var(--muted);
  opacity: 0.55;
  letter-spacing: 0.05em;
}
.word.word-link-hover { background: rgba(37, 99, 235, 0.22); }

/* Synonym chooser bubble */
.word-bubble {
  position: absolute;
  z-index: 10000;
  background: #1f2937;
  color: #fff;
  padding: 8px;
  border-radius: 8px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.18);
  transform: translate(-50%, -100%);
  margin-top: -10px;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  align-items: center;
  max-width: min(360px, 90vw);
}
.word-bubble[hidden] { display: none; }
.word-bubble::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -6px;
  transform: translateX(-50%);
  width: 0; height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 6px solid #1f2937;
}
.word-bubble .syn-btn,
.word-bubble .more-btn {
  background: rgba(255,255,255,0.10);
  border: 1px solid rgba(255,255,255,0.18);
  color: #fff;
  padding: 4px 9px;
  border-radius: 4px;
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  line-height: 1.3;
}
.word-bubble .syn-btn:hover,
.word-bubble .more-btn:hover { background: rgba(255,255,255,0.22); }
.word-bubble .syn-btn.current { border-color: var(--accent); background: rgba(37,99,235,0.40); }
.word-bubble .syn-btn.original { font-style: italic; }
.word-bubble .syn-btn.original::after {
  content: "";
  position: absolute;
}
.word-bubble .divider {
  width: 1px;
  align-self: stretch;
  background: rgba(255,255,255,0.18);
  margin: 0 2px;
}
.word-bubble .more-btn { font-weight: 700; padding: 4px 8px; }
.word-bubble .bubble-msg { font-size: 13px; color: #cbd5e1; padding: 2px 4px; }