/* research-directions — 新增/覆寫樣式，確保三欄平均分配且等高 */
.research-section{ margin-bottom:56px; }
.cards-grid{
  display:grid;
  grid-template-columns: repeat(3, 1fr); /* 三等分 */
  gap:20px;
  align-items:stretch;
}

/* 卡片等高、直向排版 */
.rd-card{
  display:flex;
  flex-direction:column;
  gap:12px;
  padding:20px;
  border-radius:14px;
  background: linear-gradient(180deg, rgba(255,255,255,0.015), rgba(255,255,255,0.01));
  border:1px solid rgba(255,255,255,0.03);
  box-shadow: 0 14px 40px rgba(6,8,20,0.45);
  transition: transform 200ms var(--ease), box-shadow 200ms var(--ease);
  height:100%;
}
.rd-card:hover{ transform: translateY(-6px); box-shadow: 0 30px 70px rgba(6,10,25,0.6); }

/* accent stripe */
.rd-accent{ width:8px; height:100%; border-radius:6px; flex-shrink:0; margin-bottom:0; }
.rd-accent.ai{ background: linear-gradient(180deg, var(--accent-1), #ffd07a); }
.rd-accent.chip{ background: linear-gradient(180deg, #ffd07a, #7fe0ff); }
.rd-accent.zta{ background: linear-gradient(180deg, #9ef6d8, #8a2be2); }

/* head / icon / body */
.rd-head{ display:flex; align-items:center; gap:12px; }
.rd-icon{
  width:56px; height:56px; display:flex; align-items:center; justify-content:center;
  background: linear-gradient(135deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border-radius:10px;
  border:1px solid rgba(255,255,255,0.03);
  color:var(--accent-1);
  flex-shrink:0;
}
.rd-head h3{ margin:0; font-size:18px; color:#e9f9ff; }
.rd-body{ margin-top:4px; }
.rd-list{ margin:0; padding-left:18px; color:rgba(220,235,255,0.92); line-height:1.7; font-size:15px; }
.rd-list li{ margin:8px 0; }

/* hover */
.rd-card:hover{ transform: translateY(-6px); box-shadow: 0 30px 70px rgba(6,10,25,0.6); }

/* 三張大卡三等分（桌面） */
.cards-grid{
  display: grid;
  grid-template-columns: repeat(3, 1fr); /* 左中右平均分配 */
  gap: 20px;
  align-items: stretch; /* 卡片等高 */
}

/* 讓卡片本身充滿格子高度，內部內容垂直排列 */
.rd-card{
  display:flex;
  flex-direction:column;
  justify-content:flex-start;
  gap:14px;
  padding:18px;
  border-radius:12px;
  background: linear-gradient(180deg, rgba(255,255,255,0.015), rgba(255,255,255,0.01));
  border:1px solid rgba(255,255,255,0.03);
  box-shadow: 0 12px 36px rgba(6,8,20,0.5);
  transition: transform 220ms var(--ease), box-shadow 220ms var(--ease);
  height:100%; /* 讓卡片占滿欄位高度，達成等高效果 */
}

/* 移除 large 卡的特殊佈局（若之前有） */
.cards-grid > .rd-card.large{
  grid-area: auto;
  min-height: 0;
}

/* 保持右側小卡在窄螢幕也能良好排列 */
@media (max-width:1100px){
  .cards-grid{
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width:720px){
  .cards-grid{
    grid-template-columns: 1fr;
  }
  .rd-card{ padding:14px; }
  .rd-accent{ width:6px; }
  .rd-icon{ width:48px; height:48px; }
}

/* research-directions — 新增/覆寫樣式，確保三欄平均分配且等高 */
.research-section{ margin-bottom:56px; }
.cards-grid{
  display:grid;
  grid-template-columns: repeat(3, 1fr); /* 三等分 */
  gap:20px;
  align-items:stretch;
}

/* 卡片等高、直向排版 */
.rd-card{
  display:flex;
  flex-direction:column;
  gap:12px;
  padding:20px;
  border-radius:14px;
  background: linear-gradient(180deg, rgba(255,255,255,0.015), rgba(255,255,255,0.01));
  border:1px solid rgba(255,255,255,0.03);
  box-shadow: 0 14px 40px rgba(6,8,20,0.45);
  transition: transform 200ms var(--ease), box-shadow 200ms var(--ease);
  height:100%;
}
.rd-card:hover{ transform: translateY(-6px); box-shadow: 0 30px 70px rgba(6,10,25,0.6); }

/* accent stripe */
.rd-accent{ width:8px; height:100%; border-radius:6px; flex-shrink:0; margin-bottom:0; }
.rd-accent.ai{ background: linear-gradient(180deg, var(--accent-1), #ffd07a); }
.rd-accent.chip{ background: linear-gradient(180deg, #ffd07a, #7fe0ff); }
.rd-accent.zta{ background: linear-gradient(180deg, #9ef6d8, #8a2be2); }

/* head / icon / body */
.rd-head{ display:flex; align-items:center; gap:12px; }
.rd-icon{ width:56px; height:56px; display:flex; align-items:center; justify-content:center; border-radius:10px; background: linear-gradient(135deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01)); border:1px solid rgba(255,255,255,0.03); color:var(--accent-1); flex-shrink:0; }
.rd-head h3{ margin:0; font-size:18px; color:#e9f9ff; }
.rd-body{ margin-top:4px; }
.rd-list{ margin:0; padding-left:18px; color:rgba(220,235,255,0.92); line-height:1.7; font-size:15px; }
.rd-list li{ margin:8px 0; }

/* hover */
.rd-card:hover{ transform: translateY(-6px); box-shadow: 0 30px 70px rgba(6,10,25,0.6); }

/* 三張大卡三等分（桌面） */
.cards-grid{
  display: grid;
  grid-template-columns: repeat(3, 1fr); /* 左中右平均分配 */
  gap: 20px;
  align-items: stretch; /* 卡片等高 */
}

/* 讓卡片本身充滿格子高度，內部內容垂直排列 */
.rd-card{
  display:flex;
  flex-direction:column;
  justify-content:flex-start;
  gap:14px;
  padding:18px;
  border-radius:12px;
  background: linear-gradient(180deg, rgba(255,255,255,0.015), rgba(255,255,255,0.01));
  border:1px solid rgba(255,255,255,0.03);
  box-shadow: 0 12px 36px rgba(6,8,20,0.5);
  transition: transform 220ms var(--ease), box-shadow 220ms var(--ease);
  height:100%; /* 讓卡片占滿欄位高度，達成等高效果 */
}

/* 移除 large 卡的特殊佈局（若之前有） */
.cards-grid > .rd-card.large{
  grid-area: auto;
  min-height: 0;
}

/* 保持右側小卡在窄螢幕也能良好排列 */
@media (max-width:1100px){
  .cards-grid{
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width:720px){
  .cards-grid{
    grid-template-columns: 1fr;
  }
  .rd-card{ padding:14px; }
  .rd-accent{ width:6px; }
  .rd-icon{ width:48px; height:48px; }
}