.rightint-case-list.main {
  padding: 70px 15px;
}

.rightint-case-list .app-list h3 {
  font-size: 40px;
  color: #212121;
  font-weight: 700;
  line-height: 1;
  position: relative;
  z-index: 20;
}

.rightint-case-list .app-list h3::before {
  display: block;
  content: attr(data-tit);
  white-space: nowrap;
  color: #fff;
  position: absolute;
  left: 0;
  top: -38px;
  font-size: 98px;
  line-height: 1;
  z-index: -1;
  text-shadow:
    rgba(210, 217, 221, 0.75) 1px 0 0,
    rgba(210, 217, 221, 0.75) 0 1px 0,
    rgba(210, 217, 221, 0.75) -1px 0 0,
    rgba(210, 217, 221, 0.75) 0 -1px 0;
}

.rightint-case-list .app-list h3::after {
  display: block;
  content: "";
  width: 80px;
  height: 2px;
  background: var(--color-primary);
  margin: 10px auto 0 0;
}

.rightint-case-list .app-list > p {
  margin: 40px 0 0;
  line-height: 36px;
  font-size: 17px;
  color: #666;
}


/* =========================
   卡片列表
   PC端默认：一行4个
========================= */

.rightint-case-list .app-list ul {
  margin: 37px -15px 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  list-style: none;
}

.rightint-case-list .app-list ul li {
  width: 25%;
  padding: 15px;
  box-sizing: border-box;
}

.rightint-case-list .app-list ul li > a {
  position: relative;
  overflow: hidden;
  display: block;
  width: 100%;
}

.rightint-case-list .app-list ul li img {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}


/* =========================
   卡片文字区域
========================= */

.rightint-case-list .app-list ul li .txt {
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  z-index: 10;
  padding: 0 24px 24px;
  box-sizing: border-box;

  transition:
    opacity 0.2s,
    transform 0.35s;

  display: flex;
  justify-content: flex-end;
  flex-direction: column;
}

.rightint-case-list .app-list ul li .txt::after {
  content: "";
  background: var(--color-primary);
  opacity: 0.85;
  height: 0;
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  transition: all 0.3s ease;
}

.rightint-case-list .app-list ul li .txt > * {
  position: relative;
  z-index: 10;
}

.rightint-case-list .app-list ul li .txt h6 {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  line-height: 1.35;
}

.rightint-case-list .app-list ul li .txt p {
  display: none;
  font-size: 14px;
  color: #fff;
  line-height: 24px;
  transition: all 0.5s ease;
  margin: 15px 0 0;

  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
}

.rightint-case-list .app-list ul li .txt .more {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
  color: #fff;
  margin: 20px 0 0;
}

.rightint-case-list .app-list ul li .txt .more i {
  color: #fff;
  font-size: 12px;
  border-radius: 50%;
  width: 26px;
  height: 26px;
  border: 1px solid #fff;
  line-height: 24px;
  display: inline-block;
  text-align: center;
  margin-right: 15px;
}


/* =========================
   Hover效果
========================= */

.rightint-case-list .app-list ul li:hover .txt::after {
  height: 100%;
}

.rightint-case-list .app-list ul li:hover .txt p {
  display: -webkit-box;
}

.rightint-case-list .app-list ul li:hover .more i {
  background: #fafbfb;
  color: var(--color-primary);
  border-color: #fafbfb;
}


/* =========================
   1200px以下
   一行3个
========================= */

@media screen and (max-width: 1200px) {

  .rightint-case-list .app-list ul li {
    width: 33.3333%;
  }

}


/* =========================
   992px以下
   一行3个
========================= */

@media screen and (max-width: 992px) {

  .rightint-case-list.main {
    padding: 60px 15px;
  }

  .rightint-case-list .app-list ul li {
    width: 33.3333%;
  }

  .rightint-case-list .app-list ul li .txt {
    padding: 0 18px 18px;
  }

  .rightint-case-list .app-list ul li .txt .more {
    display: none;
  }

  .rightint-case-list .app-list ul li .txt h6 {
    font-size: 17px;
  }

}


/* =========================
   768px以下
   一行2个
========================= */

@media screen and (max-width: 768px) {

  .rightint-case-list.main {
    padding: 45px 15px;
  }

  .rightint-case-list .app-list h3 {
    font-size: 30px;
    text-align: center;
  }

  .rightint-case-list .app-list h3::before {
    font-size: 52px;
    left: 0;
    right: 0;
    top: -22px;
    text-align: center;
  }

  .rightint-case-list .app-list h3::after {
    margin: 15px auto 0;
  }

  .rightint-case-list .app-list > p {
    margin: 25px 0 0;
    line-height: 28px;
    font-size: 15px;
    text-align: center;
  }

  .rightint-case-list .app-list ul {
    margin: 20px -8px 0;
  }

  .rightint-case-list .app-list ul li {
    width: 50%;
    padding: 8px;
  }

  .rightint-case-list .app-list ul li .txt {
    padding: 0 12px 12px;
  }

  .rightint-case-list .app-list ul li .txt h6 {
    font-size: 16px;
    line-height: 1.4;
  }

  .rightint-case-list .app-list ul li .txt p {
    font-size: 14px;
    line-height: 22px;
  }

}


/* =========================
   480px以下
   一行1个
========================= */

@media screen and (max-width: 480px) {

  .rightint-case-list.main {
    padding: 35px 15px;
  }

  .rightint-case-list .app-list h3 {
    font-size: 26px;
  }

  .rightint-case-list .app-list h3::before {
    font-size: 40px;
    top: -16px;
  }

  .rightint-case-list .app-list > p {
    margin-top: 20px;
    font-size: 14px;
    line-height: 25px;
  }

  .rightint-case-list .app-list ul {
    margin: 15px 0 0;
  }

  .rightint-case-list .app-list ul li {
    width: 100%;
    padding: 6px 0;
  }

  .rightint-case-list .app-list ul li .txt {
    padding: 0 15px 15px;
  }

  .rightint-case-list .app-list ul li .txt h6 {
    font-size: 17px;
  }

}