/* =============================================================
 * silk.css —— 绢丝族谱定制页专属样式
 * 结构与 giftbox.html 对齐：
 *   1. Banner 纯图片 1920x1072，进入页面缩放动效
 *   2. 套餐一 全男性绢丝族谱
 *      · 选择类型（两个选项，红线框选中态）
 *   3. 套餐二 全族谱定制
 *      · 选择类型
 *   4. 立即购买按钮
 * ============================================================= */

/* ---------- 整页容器 ---------- */
.page-silk {
  width: 100%;
  background: #fff;
  position: relative;
}

/* ============== Banner —— 纯图片 + 缩放动效 ============== */
.silk-banner {
  position: relative;
  width: 100%;
  height: 1072px;
  overflow: hidden;
  background: #f4ede3;
}
.silk-banner img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  animation: silkBannerZoom 1.8s cubic-bezier(.22,.61,.36,1) both;
}
@keyframes silkBannerZoom {
  0%   { transform: scale(1.12); }
  100% { transform: scale(1); }
}

/* ============== 套餐大区块 ============== */
.silk-package {
  position: relative;
  width: 100%;
  padding: 100px 0 40px;
  background: #fff;
}

/* 套餐标题：套餐X（红）+ 名称（黑），居中 */
.silk-pkg-title {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 24px;
  margin: 0 0 60px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 48px;
  line-height: 1.2;
  white-space: nowrap;
}
.silk-pkg-title .pkg-num {
  color: var(--color-accent);
}
.silk-pkg-title .pkg-name {
  color: #000;
}

/* ============== 选项行（label + 卡片组） ============== */
.silk-package .option-section {
  width: 60%;
  margin: 0 auto 60px;
  display: flex;
  flex-direction: column;
}

/* 顶部行：标题 */
.silk-package .section-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 16px;
}

/* 左侧标签："选择类型" */
.silk-package .section-label {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 28px;
  color: #000;
  text-align: left;
  line-height: 1.3;
}

/* 卡片组 */
.silk-package .section-cards {
  display: flex;
  gap: 20px;
  align-items: stretch;
}

/* ============== 选项卡片 ============== */
.silk-package .option-card {
  position: relative;
  flex: 1 1 0;
  aspect-ratio: 1 / 1;
  border: 1px solid transparent;
  padding: 18px;
  background: #fff;
  cursor: pointer;
  transition: border-color .3s ease, transform .3s ease, box-shadow .3s ease;
}
.silk-package .option-card img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .4s ease;
}
.silk-package .option-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, .12);
}
.silk-package .option-card.is-selected {
  border-color: #B81C22;
}

/* 卡片列：价格 + 卡片上下排列 */
.silk-package .card-item {
  flex: 1 1 0;
  display: flex;
  flex-direction: column;
}

/* 卡片上方价格，右对齐 */
.silk-package .card-item .card-price {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 24px;
  color: #EA0000;
  text-align: right;
  line-height: 1;
  margin-bottom: 30px;
}

/* 套餐二间距 */
.silk-package:nth-of-type(2) {
  padding-top: 60px;
}

/* ============== 立即购买按钮 ============== */
.silk-action {
  width: 100%;
  padding: 60px 0 80px;
  background: #fff;
  text-align: center;
}
.silk-buy-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 474px;
  max-width: 90%;
  height: 118px;
  background: #C30D23;
  border: 0;
  border-radius: 35px;
  color: #fff;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 48px;
  line-height: 1;
  cursor: pointer;
  transition: background .3s ease, transform .3s ease, box-shadow .3s ease;
  box-shadow: 0 8px 24px rgba(195, 13, 35, .25);
}
.silk-buy-btn:hover {
  background: #A80009;
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(195, 13, 35, .35);
}
.silk-buy-btn:active {
  transform: translateY(0);
}

/* ============== 入场动效适配 ============== */
.wow { visibility: hidden; }

/* ============== 响应式 ============== */
@media (max-width: 1200px) {
  .silk-banner { height: 700px; }
  .silk-package { padding: 60px 0 20px; }
  .silk-pkg-title { font-size: 36px; gap: 16px; margin-bottom: 40px; }
  .silk-package .option-section {
    width: 90%;
    margin-bottom: 40px;
  }
  .silk-package .section-label { font-size: 22px; }
  .silk-package .section-cards { gap: 14px; }
  .silk-action .silk-buy-btn { width: 360px; height: 90px; font-size: 36px; }
}

@media (max-width: 768px) {
  .silk-banner { height: 220px; }
  .silk-package { padding: 32px 0 16px; }
  .silk-pkg-title { font-size: 22px; gap: 10px; margin-bottom: 20px; flex-wrap: wrap; }
  .silk-package .option-section {
    width: 94%;
    margin-bottom: 24px;
  }
  .silk-package .section-header { flex-direction: column; align-items: flex-start; gap: 6px; margin-bottom: 12px; }
  .silk-package .section-label { font-size: 17px; }
  .silk-package .section-cards { flex-direction: row; gap: 12px; }
  .silk-package .card-item { flex: 1 1 0; min-width: 0; }
  .silk-package .card-item .card-price {
    font-size: 15px;
    margin-bottom: 12px;
    white-space: nowrap;
  }
  .silk-package .option-card {
    aspect-ratio: 1 / 1;
    padding: 10px;
  }
  .silk-package .option-card img { aspect-ratio: auto; }
  .silk-action { padding: 24px 0 44px; }
  .silk-action .silk-buy-btn { width: 240px; height: 60px; font-size: 22px; border-radius: 20px; }
}

@media (max-width: 480px) {
  .silk-banner { height: 170px; }
  .silk-package { padding: 26px 0 14px; }
  .silk-pkg-title { font-size: 19px; margin-bottom: 16px; }
  .silk-package .section-label { font-size: 15px; }
  .silk-package .card-item .card-price { font-size: 13px; }
  .silk-action .silk-buy-btn { width: 220px; height: 54px; font-size: 20px; }
}