* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #0f1419;
  --panel: #1a2332;
  --border: #2d3a4d;
  --text: #e6edf3;
  --muted: #8b949e;
  --red: #f85149;
  --green: #3fb950;
  --yellow: #d29922;
  --input-bg: #21262d;
  --radius: 8px;
}

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  margin: 0;
  padding: 0;
}

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  width: 100%;
  max-width: none;
}

.header {
  flex-shrink: 0;
  padding: 16px 20px 0;
  margin-bottom: 12px;
}

.header h1 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.subtitle {
  color: var(--muted);
  font-size: 0.9rem;
}

.input-section {
  flex-shrink: 0;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin: 0 20px 12px;
}

.input-section label {
  display: block;
  font-size: 0.85rem;
  margin-bottom: 8px;
  color: var(--muted);
}

.input-row {
  display: flex;
  gap: 10px;
  align-items: center;
}

.input-row input {
  flex: 1;
  padding: 10px 12px;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--input-bg);
  color: var(--text);
}

.input-row input:focus {
  outline: none;
  border-color: var(--green);
}

.input-row button {
  padding: 10px 20px;
  font-size: 0.95rem;
  font-weight: 500;
  border: none;
  border-radius: 6px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  white-space: nowrap;
}

#addRed {
  background: var(--red);
  color: #0d1117;
}

#addGreen {
  background: var(--green);
  color: #0d1117;
}

#delRed {
  background: transparent;
  color: var(--red);
  border: 1px solid var(--red);
}

#delGreen {
  background: transparent;
  color: var(--green);
  border: 1px solid var(--green);
}

.input-row button:hover {
  filter: brightness(1.1);
}

.input-row button:active {
  transform: scale(0.98);
}

.hint {
  margin-top: 10px;
  font-size: 0.8rem;
  color: var(--muted);
}

.trend-section {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin: 0 20px 20px;
  overflow: hidden;
}

.trend-header {
  flex-shrink: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
  font-weight: 500;
}

.trend-header .count {
  color: var(--muted);
  font-weight: 400;
}

.trend-window {
  flex: 1;
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  align-content: flex-start;
  gap: 8px;
  padding: 16px;
  min-height: 0;
  overflow-x: hidden;
  overflow-y: auto;
}

.trend-col {
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: center;
}

.trend-col-items {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.trend-col-count {
  font-size: 0.75rem;
  color: var(--muted);
  margin-top: 4px;
}

.trend-item {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 600;
  color: transparent;
  cursor: default;
  transition: transform 0.15s;
  position: relative;
}

.trend-item:hover {
  transform: scale(1.15);
}

.trend-item::after {
  content: attr(data-value);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-6px);
  padding: 4px 8px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.75rem;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s;
  z-index: 1;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.trend-item:hover::after {
  opacity: 1;
}

.trend-item.red {
  background: var(--red);
}

.trend-item.green {
  background: var(--green);
}

.trend-item.yellow {
  background: var(--yellow);
}

.empty-trend {
  color: var(--muted);
  font-size: 0.9rem;
  padding: 24px;
  text-align: center;
  width: 100%;
}

.error-msg {
  color: var(--red);
  font-size: 0.85rem;
  margin-top: 8px;
}