/* ===== 首页布局 ===== */
.index-page {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 60px 24px;
  background-image: url("../images/index-bg.png");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-color: #f0e9dc;
  background-attachment: fixed;
}

/* ===== 信封容器 ===== */
.letter-wrapper {
  position: relative;
  width: 100%;
  max-width: 760px;
  background-color: #faf6ef;
  border: 1px solid #d9cdb8;
  box-shadow: 0 4px 24px rgba(61, 43, 31, 0.08);
  padding: 60px 64px 48px;
}

/* 邮票装饰 - 右上角 */
.letter-stamp {
  position: absolute;
  top: 24px;
  right: 24px;
  width: 72px;
  height: 84px;
  border: 2px solid #c4a882;
  background-color: #f5f0e8;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.letter-stamp::after {
  content: "侨批";
  font-size: 0.75rem;
  color: #6b5a4c;
  letter-spacing: 4px;
  writing-mode: vertical-rl;
}

/* 邮票齿孔效果 */
.letter-stamp::before {
  content: "";
  position: absolute;
  top: -4px;
  left: -4px;
  right: -4px;
  bottom: -4px;
  border: 2px dashed #c4a882;
  border-radius: 2px;
}

/* ===== 火漆装饰 ===== */
.letter-seal {
  position: absolute;
  bottom: -20px;
  left: 50%;
  transform: translateX(-50%);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: #c4a882;
  display: flex;
  align-items: center;
  justify-content: center;
}

.letter-seal-inner {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid #d9cdb8;
}

/* ===== 家书头部 ===== */
.letter-header {
  text-align: center;
  margin-bottom: 40px;
  padding-bottom: 32px;
  border-bottom: 1px dashed #d9cdb8;
}

.letter-greeting {
  font-size: 0.95rem;
  color: #8b7355;
  letter-spacing: 3px;
  margin-bottom: 16px;
}

.letter-title {
  font-size: 2rem;
  color: #3d2b1f;
  letter-spacing: 6px;
  font-weight: normal;
  line-height: 1.5;
}

.letter-title-sub {
  display: block;
  font-size: 1rem;
  color: #8b7355;
  letter-spacing: 4px;
  margin-top: 12px;
  font-weight: normal;
}

/* ===== 家书正文 ===== */
.letter-body {
  margin-bottom: 40px;
}

.letter-body p {
  font-size: 1rem;
  color: #4a3728;
  text-indent: 2em;
  margin-bottom: 16px;
  line-height: 2;
}

.letter-body p:last-child {
  margin-bottom: 0;
}

.letter-signature {
  text-align: right;
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px dashed #d9cdb8;
}

.letter-signature p {
  text-indent: 0;
  font-size: 0.9rem;
  color: #8b7355;
  line-height: 1.8;
  margin-bottom: 0;
}

/* ===== 底部操作区 ===== */
.letter-footer {
  text-align: center;
  padding-top: 36px;
}

.letter-footer .btn-primary {
  position: relative;
}

.letter-footer .btn-primary::after {
  content: "";
  position: absolute;
  top: -4px;
  left: -4px;
  right: -4px;
  bottom: -4px;
  border: 1px solid #c4a882;
  border-radius: 6px;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.letter-footer .btn-primary:hover::after {
  opacity: 1;
}

.letter-footer-hint {
  margin-top: 14px;
  font-size: 0.8rem;
  color: #a89880;
  letter-spacing: 1px;
}

/* ===== 响应式适配 ===== */

/* 宽屏：大于 1400px */
@media screen and (min-width: 1400px) {
  .letter-wrapper {
    max-width: 840px;
    padding: 72px 80px 56px;
  }

  .letter-title {
    font-size: 2.25rem;
  }

  .letter-body p {
    font-size: 1.1rem;
  }
}

/* 小笔记本：1024px 及以下 */
@media screen and (max-width: 1024px) {
  .index-page {
    padding: 40px 20px;
  }

  .letter-wrapper {
    max-width: 680px;
    padding: 44px 40px 40px;
  }

  .letter-stamp {
    width: 60px;
    height: 72px;
    top: 16px;
    right: 16px;
  }

  .letter-stamp::after {
    font-size: 0.65rem;
  }

  .letter-title {
    font-size: 1.6rem;
    letter-spacing: 4px;
  }

  .letter-title-sub {
    font-size: 0.9rem;
  }

  .letter-body p {
    font-size: 0.95rem;
  }
}

/* 窄屏窗口：900px 及以下 */
@media screen and (max-width: 900px) {
  .index-page {
    padding: 32px 16px;
  }

  .letter-wrapper {
    max-width: 100%;
    padding: 36px 28px 36px;
  }

  .letter-stamp {
    width: 48px;
    height: 60px;
    top: 12px;
    right: 12px;
  }

  .letter-stamp::after {
    font-size: 0.55rem;
    letter-spacing: 2px;
  }

  .letter-stamp::before {
    top: -3px;
    left: -3px;
    right: -3px;
    bottom: -3px;
  }

  .letter-header {
    margin-bottom: 28px;
    padding-bottom: 24px;
  }

  .letter-greeting {
    font-size: 0.85rem;
    letter-spacing: 2px;
  }

  .letter-title {
    font-size: 1.35rem;
    letter-spacing: 3px;
  }

  .letter-title-sub {
    font-size: 0.85rem;
    margin-top: 8px;
    letter-spacing: 2px;
  }

  .letter-body p {
    font-size: 0.9rem;
    line-height: 1.9;
    margin-bottom: 14px;
  }

  .letter-signature {
    margin-top: 28px;
    padding-top: 16px;
  }

  .letter-signature p {
    font-size: 0.85rem;
  }

  .letter-footer {
    padding-top: 28px;
  }

  .btn-primary {
    padding: 10px 32px;
    font-size: 1rem;
  }

  .letter-footer-hint {
    font-size: 0.75rem;
  }
}