/* ===== 全局样式 ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #f0f2f5;
  --panel-bg: #ffffff;
  --border: #e0e0e0;
  --text: #333333;
  --text-secondary: #666666;
  --accent: #4A90D9;
  --accent-female: #E8739E;
  --danger: #d94a4a;
  --success: #4CAF50;
  --warn: #FF9800;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --radius: 8px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
}

/* ===== 三栏布局 ===== */
.container {
  display: grid;
  grid-template-columns: 300px 1fr 340px;
  height: 100vh;
  gap: 0;
}

.panel {
  display: flex;
  flex-direction: column;
  background: var(--panel-bg);
  overflow: hidden;
}

.panel h2 {
  font-size: 16px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  color: var(--text);
}

/* ===== 左侧控制台 ===== */
.panel-left {
  border-right: 1px solid var(--border);
  overflow-y: auto;
}

.config-section {
  border: none;
  padding: 12px 16px;
  border-bottom: 1px solid #f0f0f0;
}

.config-section legend {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 0;
  margin-bottom: 8px;
}

.form-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.form-row label {
  font-size: 12px;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.form-row input[type="number"] {
  width: 70px;
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 13px;
  text-align: center;
  font-family: inherit;
}

.form-row input[type="number"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(74,144,217,0.15);
}

.input-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.input-group input {
  width: 55px !important;
}

.input-group span {
  color: var(--text-secondary);
  font-size: 12px;
}

.speed-section {
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.speed-section label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  flex-shrink: 0;
}

#speedSlider {
  flex: 1;
  accent-color: var(--accent);
}

/* 按钮组 */
.button-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding: 14px 16px;
}

.btn {
  padding: 10px 0;
  border: none;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s ease;
}

.btn:hover { opacity: 0.85; }
.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }

.btn-start { background: var(--success); color: #fff; }
.btn-pause { background: var(--warn); color: #fff; }
.btn-step { background: var(--accent); color: #fff; }
.btn-reset { background: #999; color: #fff; grid-column: 1 / -1; }

/* ===== 中间演示区 ===== */
.panel-center {
  padding: 0;
}

.canvas-wrapper {
  flex: 1;
  position: relative;
  display: flex;
  flex-direction: column;
}

#populationCanvas {
  flex: 1;
  width: 100%;
  display: block;
}

.canvas-legend {
  display: flex;
  gap: 16px;
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 5px;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.dot.male { background: #4A90D9; }
.dot.female { background: #E8739E; }
.dot.dead { background: #999; opacity: 0.5; }

.line-sample {
  color: rgba(150,150,150,0.6);
  font-size: 16px;
  letter-spacing: 0;
}

/* ===== 右侧日志区 ===== */
.panel-right {
  border-left: 1px solid var(--border);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.stats-section {
  padding: 12px 16px;
  overflow-y: auto;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border);
}

.year-display {
  font-size: 28px;
  font-weight: 700;
  text-align: center;
  padding: 8px 0;
  color: var(--accent);
  border-bottom: 2px solid #f0f0f0;
  margin-bottom: 10px;
}

.stat-block {
  margin-bottom: 12px;
}

.stat-block h4 {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 4px;
  font-weight: 600;
}

.stat-row {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  padding: 2px 0;
}

.stat-row span:first-child { color: var(--text-secondary); }
.stat-row span:last-child { font-weight: 600; }

/* 柱状图 */
.bar-chart {
  margin-top: 6px;
}

.bar-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 5px;
}

.bar-label {
  font-size: 11px;
  color: var(--text-secondary);
  width: 36px;
  text-align: right;
  flex-shrink: 0;
}

.bar-track {
  flex: 1;
  height: 14px;
  background: #f0f0f0;
  border-radius: 7px;
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  border-radius: 7px;
  transition: width 0.3s ease;
  min-width: 0;
}

.bar-0-18  { background: #81C784; }
.bar-18-30 { background: #4A90D9; }
.bar-30-50 { background: #FF9800; }
.bar-50-plus { background: #BA68C8; }

.bar-count {
  font-size: 12px;
  font-weight: 600;
  width: 28px;
  text-align: left;
  flex-shrink: 0;
}

/* 日志输出 */
.log-section {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0;
}

.log-section h4 {
  font-size: 12px;
  padding: 10px 16px 6px;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.log-output {
  flex: 1;
  overflow-y: auto;
  padding: 0 16px 12px;
  font-size: 12px;
  line-height: 1.8;
  font-family: "SF Mono", "Menlo", "Consolas", monospace;
}

.log-entry {
  padding: 2px 0;
  border-bottom: 1px solid #fafafa;
}

.log-system   { color: #999; }
.log-year     { color: var(--text); font-weight: 600; }
.log-birth    { color: var(--success); }
.log-death    { color: var(--danger); }
.log-couple   { color: var(--accent); }

/* ===== 响应式 ===== */
@media (max-width: 1200px) {
  .container {
    grid-template-columns: 260px 1fr 300px;
  }
}