/* ========= 容器布局 ========= */
.container {
  max-width: 95vw;
  margin: 0 auto;
  padding: 10px;
  width: 100%;
}

/* ========= 头部布局 ========= */
.header {
  text-align: center;
  color: #fff;
  margin-bottom: 18px;
  padding: 22px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 14px;
}

.header h1 {
  font-size: 2.1em;
  margin-bottom: 6px;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, .25);
}

.header p {
  opacity: .9;
}

/* ========= 缩略图网格 ========= */
.thumb-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 12px;
}

/* ========= 描述行 (Flex布局) ========= */
.desc-row {
  margin-top: 14px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: flex-start;
}

/* ========= 概览面板 (Grid布局) ========= */
.overview-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  align-items: stretch;
  margin-bottom: 14px;
}

/* ========= 步骤网格 (Grid布局) ========= */
.step-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.5fr 0.9fr;
  gap: 12px;
}

/* ========= 计划配对 (Grid布局) ========= */
.plan-pairs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}

/* ========= 模拟网格 (Grid布局) ========= */
.sim-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 12px;
}

/* World model content styling */
.sim-grid video,
.wm-video,
.wm-content,
.wm-content img,
.wm-content video {
  width: 100%;
  border-radius: 4px;
  object-fit: contain;
  max-height: 320px;
}

@media (max-width: 1100px) {
  .overview-panel,
  .step-grid {
    grid-template-columns: 1fr;
  }
}