:root {
  --green: #76b900;
  --green-dark: #5a8f00;
  --black: #111;
  --text: #242424;
  --muted: #666;
  --border: #d9d9d9;
  --surface: #fff;
  --page: #f5f5f5;
  --danger: #d52b1e;
  --danger-bg: #fff0ef;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 320px;
  background: var(--page);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
}

.site-header {
  height: 68px;
  background: var(--black);
  color: #fff;
  border-bottom: 4px solid var(--green);
}

.header-inner {
  width: min(1180px, calc(100% - 40px));
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  color: #fff;
  text-decoration: none;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: .03em;
}

.brand-icon {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  background: var(--green);
  color: #fff;
  font-size: 20px;
  font-weight: 900;
  transform: skew(-7deg);
  border-radius: 3px;
}

.container { width: min(1180px, calc(100% - 40px)); margin: 48px auto 70px; }
.intro { margin-bottom: 28px; }
h1 { margin: 0; color: var(--black); font-size: clamp(32px, 4vw, 48px); line-height: 1.05; letter-spacing: -.035em; }

.editors { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.panel { overflow: hidden; background: var(--surface); border: 1px solid var(--border); border-top: 3px solid var(--black); border-radius: 5px; }
.panel:focus-within { border-top-color: var(--green); box-shadow: 0 6px 22px rgba(0,0,0,.07); }
.panel label { display: block; padding: 14px 17px; border-bottom: 1px solid var(--border); color: var(--black); font-size: 13px; font-weight: 800; text-transform: uppercase; letter-spacing: .05em; }
textarea { display: block; width: 100%; height: 300px; padding: 18px; border: 0; outline: 0; resize: vertical; color: var(--text); background: #fff; font: 14px/1.7 "SFMono-Regular", Consolas, monospace; }
textarea::placeholder { color: #aaa; }

.actions { display: flex; gap: 10px; margin-top: 18px; }
button { min-height: 44px; padding: 0 22px; border: 1px solid #bdbdbd; border-radius: 5px; background: #fff; color: #222; font-weight: 700; cursor: pointer; transition: .16s ease; }
button:hover { border-color: #777; background: #eee; }
button.primary { border-color: var(--green); background: var(--green); color: #fff; }
button.primary:hover { border-color: var(--green-dark); background: var(--green-dark); }

.result-section { width: 100%; margin-top: 42px; }
.result-heading { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-bottom: 12px; }
.result-heading h2 { margin: 0; color: var(--black); font-size: 23px; }
#summary { font-size: 13px; font-weight: 700; }
.difference-summary { color: var(--danger); }
.match-signal {
  width: 31px;
  height: 31px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--green);
  color: #fff;
  font-size: 19px;
  line-height: 1;
}
.result-layout { display: block; }
.comparison-table { width: 100%; min-width: 0; overflow: hidden; border-radius: 5px; }
.result-labels, .result-row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) 230px; }
.result-layout.match .result-labels, .result-layout.match .result-row { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
.result-layout.match .change-heading, .result-layout.match .empty-note { display: none; }
.result-labels { padding: 12px 0; background: var(--black); border: 1px solid var(--black); color: #fff; }
.result-labels strong { padding: 0 17px; font-size: 12px; text-transform: uppercase; letter-spacing: .08em; }
.result-labels strong:first-child { border-left: 4px solid var(--green); }
.result-labels strong + strong { border-left: 1px solid #555; }
.change-heading { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.change-heading span + span { border-left: 1px solid #555; padding-left: 10px; }
.results { overflow: visible; border: 1px solid var(--border); border-top: 0; background: #fff; border-radius: 0 0 5px 5px; }
.result-row { position: relative; border-top: 1px solid #e4e4e4; }
.result-row:first-child { border-top: 0; }
.line { min-height: 46px; padding: 12px 15px; white-space: pre-wrap; overflow-wrap: anywhere; color: var(--text); background: #fff; font: 13px/1.65 "SFMono-Regular", Consolas, monospace; }
.line + .line { border-left: 1px solid var(--border); }
.line::before { content: attr(data-line); display: inline-block; width: 32px; color: #999; user-select: none; font-size: 11px; }
.same .line { background: #fff; }
.different .line { background: #fff; }
.empty { color: #8a8a8a; font-style: italic; }

/* A fully missing line is called out across both columns. */
.missing-line .line { background: var(--danger-bg); color: var(--danger); }
.missing-line .line:not(.empty) { box-shadow: inset 4px 0 0 var(--danger); }

.diff-token {
  margin: 0 1px;
  padding: 1px 3px;
  border: 1px solid #ef5146;
  border-radius: 2px;
  background: #ffdcd9;
  color: #a91e15;
  font-style: normal;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}

.diff-token.placeholder { display: inline-block; width: 10px; min-height: 17px; padding: 0; vertical-align: -3px; }
.diff-token.space-diff { display: inline; margin: 0; padding: 1px 0; text-decoration: underline; text-decoration-thickness: 2px; }
.diff-token.space-placeholder { width: 7px; min-height: 15px; margin: 0; vertical-align: -2px; }

.row-note {
  min-width: 0;
  display: flex;
  align-content: flex-start;
  flex-wrap: wrap;
  gap: 5px;
  padding: 8px;
  border-left: 1px solid var(--border);
  background: #fafafa;
}
.row-change {
  width: 100%;
  min-width: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 7px;
  padding: 5px 7px;
  border-radius: 3px;
  background: var(--danger-bg);
  color: var(--danger);
  font: 10px/1.2 "SFMono-Regular", Consolas, monospace;
}
.row-change b { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 600; }
.row-change b + b { border-left: 1px solid #efb6b2; padding-left: 7px; }
.empty-note { min-height: 100%; }

@media (max-width: 700px) {
  .header-inner, .container { width: min(100% - 24px, 1180px); }
  .container { margin-top: 32px; }
  .editors { grid-template-columns: 1fr; }
  textarea { height: 220px; }
  .result-heading { align-items: center; }
  .line { padding: 9px; font-size: 12px; }
  .line::before { width: 24px; }
  .result-labels, .result-row { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .change-heading { display: none; }
  .row-note {
    position: static;
    grid-column: 1 / -1;
    width: auto;
    margin: 0;
    border-top: 1px solid var(--border);
    border-left: 0;
  }
  .empty-note { display: none; }
}