/* ========================================
   全局样式
   ======================================== */
* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  font-family: Arial, sans-serif;
  background-color: #f0f0f0;
  max-width: 110rem;
  margin: 0 auto;
}

/* 内容区域 */
#carousel,
.banner {
  flex-shrink: 0;
}

/* footer 置底 */
footer {
  margin-top: auto;
  width: 100%;
  margin-top: 2rem;
  padding: 1.5rem;
  background-color: #333;
  color: #999;
  text-align: center;
  font-size: 0.9rem;
  border-top: 1px solid #555;
  line-height: 1.8;
}

/* ========================================
   PC 端样式 (≥1024px)
   ======================================== */
#head {
  width: 100%;
}

#menu {
  display: flex;
  justify-content: space-between;
  align-items: center;
  list-style: none;
  margin: 0 5rem;
  padding: 0 5rem;
}

#menu a {
  display: block;
}

#let {
  margin-right: auto;
}

#menu>li {
  margin: 0 1rem;
}

#menu>li>img {
  max-width: 100%;
  height: auto;
  display: block;
}
#menu>li>a>img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* 轮播样式 */
#carousel {
  position: relative;
  width: 100%;
  max-width: 80rem;
  margin: 20px auto;
  overflow: hidden;
}

.carousel-container {
  position: relative;
  width: 100%;
  height: auto;
}

.slide {
  position: absolute;
  inset: 0;
  width: 100%;
  opacity: 0;
  transition: opacity 1s ease;
}

.slide.active {
  opacity: 1;
  position: relative;
}

.slide img {
  width: 100%;
  height: auto;
  display: block;
}

.prev,
.next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(0, 0, 0, 0.5);
  color: white;
  border: none;
  padding: 10px;
  cursor: pointer;
  font-size: 18px;
  z-index: 10;
}

.prev {
  left: 10px;
}

.next {
  right: 10px;
}

/* banner 样式 */
.banner {
  text-align: center;
  margin: 20px auto;
  max-width: 80rem;
  border-radius: 0.75rem;
  overflow: hidden;
}

.banner img {
  width: 100%;
  height: auto;
  display: block;
}

.dowbload_bg {
  margin: 20px auto 0;
  padding: 1.25rem;
  background-image: url("../images/dowbload_bg.jpg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  border-radius: 1rem;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  max-width: 80rem;
  min-height: 10rem;
}

#download {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  list-style: none;
  margin: 0;
  padding: 4rem;
}

#download li {
  flex: 1;
  min-width: 0;
}

#download a {
  display: inline-flex;
  width: 100%;
  justify-content: center;
  align-items: center;
  text-decoration: none;
  color: #000;
}

#download .button {
  width: 100%;
  padding: 1rem 1rem;
  background: rgba(255, 255, 255, 0.8);
  border-radius: 0.75rem;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  border: none;
  cursor: pointer;
  transition: background 0.3s ease;
}

.wenben {
  padding: 2rem 1rem;
  text-align: center;
}

.wenben .txt {
  padding: 1rem 1.5rem;
  margin: 1rem 0;
  border-bottom: 1px dashed #ccc;
  font-size: 1rem;
  color: #333;
  line-height: 1.6;
}

.wenben .letgame {
  display: inline-flex;
  align-items: center;
  padding: 1rem 1.5rem;
  margin: 1rem 0;
  line-height: 1.6;
  width: 100%;
  justify-content: center;
}

.wenben .letgame>img {
  width: 36px;
  height: 36px;
  display: inline-block;
  margin-right: 0.5rem;
}

/* ========================================
   平板端样式 (768px - 1023px)
   ======================================== */
@media (max-width: 1023px) {
  body {
    max-width: 100%;
    padding: 0;
  }

  #head {
    padding: 0.5rem 0;
  }

  #menu {
    padding: 0 0.75rem;
    margin: 0;
    gap: 0.5rem;
  }

  #menu>li {
    margin: 0;
  }

  #carousel {
    max-width: 100%;
    margin: 15px auto;
  }

  .prev,
  .next {
    padding: 8px;
    font-size: 16px;
  }

  .banner {
    max-width: 100%;
    margin: 15px auto;
  }

  .banner>img {
    max-width: 100%;
    margin: 10px auto;
  }

  .dowbload_bg {
    margin: 15px auto 0;
    padding: 1rem;
  }

  #download {
    gap: 0.75rem;
    padding: 2rem;
  }

  #download .button {
    padding: 0.9rem 0.9rem;
    font-size: 0.98rem;
  }

  .wenben {
    padding: 1.5rem 1rem;
  }

  .wenben .txt {
    padding: 0.9rem 1rem;
    margin: 0.75rem 0;
    font-size: 0.95rem;
  }

  .wenben .letgame {
    padding: 0.9rem 1rem;
    margin: 0.75rem 0;
  }

  footer {
    margin-top: 1.5rem;
    padding: 1rem;
    font-size: 0.85rem;
  }
}

/* ========================================
   手机端样式 (≤767px)
   ======================================== */
@media (max-width: 767px) {
  body {
    max-width: 100%;
    padding: 0;
  }

  #head {
    padding: 0.25rem 0;
  }

  #menu {
    padding: 0;
    margin: 0;
    gap: 0.25rem;
  }

  #menu>li {
    margin: 0;
  }

  #menu img {
    max-width: 100%;
    height: auto;
  }

  #carousel {
    max-width: 95%;
    margin: 10px auto;
  }

  .prev,
  .next {
    padding: 6px;
    font-size: 14px;
  }

  .banner {
    max-width: 95%;
    margin: 10px auto;
  }

  .banner>img {
    max-width: 100%;
    margin: 10px auto;
  }

  .dowbload_bg {
    max-width: 95%;
    margin: 10px auto 0;
    padding: 0.85rem;
    border-radius: 0.9rem;
    /* background-size: contain; */
    background-size: cover;
  }

  #download {
    flex-direction: column;
    gap: 0.75rem;
    padding: 1rem;
  }

  #download li {
    width: 100%;
  }

  #download .button {
    padding: 0.9rem 0.95rem;
    font-size: 0.95rem;
  }

  .wenben {
    padding: 1rem 0.5rem;
  }

  .wenben .txt {
    padding: 0.75rem 1rem;
    margin: 0.75rem 0;
    font-size: 0.9rem;
  }

  .wenben .letgame {
    padding: 0.75rem 1rem;
    margin: 0.75rem 0;
    justify-content: center;
  }

  footer {
    margin-top: 1rem;
    padding: 0.75rem;
    font-size: 0.8rem;
  }
}

/* ========================================
   超小屏幕 (≤480px)
   ======================================== */
@media (max-width: 480px) {
  #menu {
    padding: 0 0.5rem;
    gap: 0.2rem;
  }

  .prev,
  .next {
    padding: 5px;
    font-size: 12px;
  }

  #download {
    padding: 0.75rem;
  }

  #download .button {
    padding: 0.85rem 0.9rem;
    font-size: 0.9rem;
  }

  .wenben {
    padding: 0.75rem 0.5rem;
  }

  .wenben .txt {
    padding: 0.65rem 0.9rem;
    margin: 0.6rem 0;
    font-size: 0.85rem;
  }

  .wenben .letgame {
    padding: 0.65rem 0.9rem;
    margin: 0.6rem 0;
  }

  .wenben .letgame>img {
    width: 32px;
    height: 32px;
    margin-right: 0.4rem;
  }

  footer {
    margin-top: 0.75rem;
    padding: 0.65rem;
    font-size: 0.75rem;
  }
}