:root {
  --bg: #141615;
  --panel: #1d211f;
  --panel-strong: #262b28;
  --text: #f3f0e8;
  --muted: #bdb5a4;
  --accent: #d6a84f;
  --border: #353b37;
  --add-bg: #1f3a29;
  --add-border: #5eb16e;
  --remove-bg: #4a2325;
  --remove-border: #d06a72;
  --focus-bg: #493f17;
  --focus-border: #f1cb57;
  --code-font-size: 15px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
select {
  font: inherit;
}

.app {
  width: min(1400px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 24px 0 32px;
}

.app__header {
  display: grid;
  gap: 20px;
  align-items: end;
  margin-bottom: 20px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.9rem;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1.05;
}

.controls {
  display: grid;
  gap: 12px;
}

.control {
  display: grid;
  gap: 8px;
}

.control > span,
.control label > span {
  color: var(--muted);
  font-size: 0.95rem;
}

select,
button,
.zoom-group output {
  min-height: 42px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
}

select,
button {
  padding: 0 14px;
}

button {
  cursor: pointer;
}

button:hover,
select:hover {
  border-color: var(--accent);
}

.control--buttons {
  align-items: start;
}

.zoom-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.zoom-group button {
  min-width: 52px;
}

.zoom-group output {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 76px;
  padding: 0 14px;
}

.status-bar,
.legend,
.viewer {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.status-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  margin-bottom: 12px;
}

.status-bar p,
.status-bar strong {
  margin: 0;
}

.status-bar__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: start;
  justify-content: flex-end;
  gap: 10px;
  color: var(--muted);
}

.focus-label {
  color: var(--accent);
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  padding: 12px 18px;
  margin-bottom: 14px;
  color: var(--muted);
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.legend__chip {
  width: 14px;
  height: 14px;
  border-radius: 4px;
  border: 1px solid transparent;
}

.legend__chip--add {
  background: var(--add-bg);
  border-color: var(--add-border);
}

.legend__chip--remove {
  background: var(--remove-bg);
  border-color: var(--remove-border);
}

.legend__chip--focus {
  background: var(--focus-bg);
  border-color: var(--focus-border);
}

.viewer {
  overflow: hidden;
}

.viewer__header,
.viewer__row {
  display: grid;
  grid-template-columns: 72px 72px minmax(420px, 1.5fr) minmax(280px, 1fr);
  min-width: 980px;
}

.viewer__header {
  background: var(--panel-strong);
  color: var(--muted);
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border);
}

.viewer__header span {
  padding: 12px 14px;
}

.viewer__body {
  max-height: 72vh;
  overflow: auto;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: var(--code-font-size);
  line-height: 1.5;
}

.viewer__row {
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.viewer__row:last-child {
  border-bottom: 0;
}

.viewer__row--add {
  background: var(--add-bg);
  box-shadow: inset 3px 0 0 var(--add-border);
}

.viewer__row--remove {
  background: var(--remove-bg);
  box-shadow: inset 3px 0 0 var(--remove-border);
}

.viewer__row--focus {
  background:
    linear-gradient(0deg, rgba(241, 203, 87, 0.12), rgba(241, 203, 87, 0.12)),
    var(--focus-bg);
  box-shadow: inset 3px 0 0 var(--focus-border);
}

.viewer__line-number,
.viewer__code,
.viewer__explanation {
  padding: 6px 14px;
}

.viewer__line-number {
  color: var(--muted);
  text-align: right;
  user-select: none;
  border-right: 1px solid rgba(255, 255, 255, 0.04);
}

.viewer__code {
  white-space: pre;
  overflow-x: auto;
}

.viewer__explanation {
  color: var(--muted);
  border-left: 1px solid rgba(255, 255, 255, 0.04);
  white-space: normal;
  overflow-wrap: anywhere;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: calc(var(--code-font-size) - 1px);
}

.token-comment {
  color: #8da88f;
}

.token-keyword {
  color: #f08c5c;
}

.token-string {
  color: #e4c66c;
}

.token-number {
  color: #7fd1bf;
}

.token-preprocessor {
  color: #e18ac1;
}

@media (min-width: 960px) {
  .app__header {
    grid-template-columns: minmax(0, 1fr) minmax(360px, 520px);
  }

  .controls {
    justify-self: end;
    width: 100%;
  }
}

@media (max-width: 640px) {
  .app {
    width: min(100vw - 20px, 1400px);
    padding-top: 18px;
  }

  .viewer__header,
  .viewer__row {
    grid-template-columns: 56px 56px minmax(300px, 1.2fr) minmax(240px, 1fr);
    min-width: 700px;
  }

  .viewer__header span,
  .viewer__line-number,
  .viewer__code,
  .viewer__explanation {
    padding-left: 10px;
    padding-right: 10px;
  }
}