/* ====== 双蓝现代系 ====== */
:root {
  --bg: #f0f0f0;
  --light: #45b4ff;
  --deep: #008bff;
  --glass: #FFFFFF;
  --txt: #111111;
  --txt2: #555555;
  --line: #E5E5E5;
  --radius: 12px;
}

/* ====== 全局重置 ====== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background: var(--bg);
  color: var(--txt);
  font-family:  Arial;
  overflow-x: hidden;
}

body::before {
  display: none;
}

/* ====== Banner ====== */
.banner {
  width: 100%;
  position: relative;
}

.banner img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
}

/* ====== 导航 ====== */
.nav {
  position: sticky;
  top: 0;
  z-index: 9;
  background: var(--glass);
  border-bottom: 1px solid var(--line);
  display: flex;
  height: 56px;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  color: var(--txt2);
  position: relative;
}

.nav a {
  display: inline-block;   /* 关键：让宽度由文字决定 */
  padding: 0;              /* 去掉左右 padding */
  margin: 0 10px;          /* 用 margin 留间距，可随意调小 */
  color: inherit;
  text-decoration: none;
  transition: color .3s;
}

.nav a.active {
  color: var(--deep);
}

.nav-line {
  position: absolute;
  bottom: 0;
  left: var(--nav-line-left, 0);
  width: var(--nav-line-width, 0);
  height: 3px;
  background: var(--deep);
  border-radius: 2px;
  transition: all .35s cubic-bezier(.4, 0, .2, 1);
}

/* ====== 板块标题 ====== */
.sec-tit {
  font-size: 22px;
  font-weight: 500;
  text-align: center;
  margin-bottom: 28px;
}

.sec-desc {
  font-size: 16px;
  color: var(--txt2);
  text-align: center;
  margin-bottom: 32px;
}

/* ========= 整区白底卡片 ========= */
.card-white {
  background: #fff;
  margin: 12px 0px 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, .04);
  padding: 24px 0;
}

/* ====== 软件下载区 ====== */
.user-card-bg {
  margin: 0 8px;
  border-radius: var(--radius);
  overflow: hidden;
  background-position: center;
  background-size: cover;
  position: relative;
}

.user-card-content {
  padding: 1px 0;
  text-align: center;
  background: rgba(255, 255, 255, .15);
  backdrop-filter: blur(4px);
}

.user-card-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
}

.user-card-icon img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  vertical-align: middle;
}

.user-card-tit {
  font-size: 32px;
  margin-top: 12px;
  margin-bottom: 10px;
  letter-spacing: 1px;
  font-weight: 700;
  color: #4d4d4d;
  font-family:  Arial;
}

.user-card-desc {
  font-size: 16px;
  color: #8c8c8c;;
  font-weight: 300;
  margin-bottom: 32px;
  font-family: "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Light", Helvetica, Arial, Verdana, sans-serif;
}

.user-card-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 30px;
  margin: 0 auto;
  width: 280px;
  padding: 12px 0;
  border-radius: 4px;
  background: #1d98dc;
  color: #fff;
  font-size: 16px;
  text-decoration: none;
  transition: filter .3s;
}

.btn-icon {
  display: flex;
  align-items: center;
  height: 22px;
}

.btn-icon img {
  height: 100%;
  width: auto;
}

/* ========= 4 个圆角正方形 ========= */
.user-card-extras {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 28px;
  padding: 0 10px;
}

.extra-item {
  flex: 0 0 68px;
  height: 68px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: #1d98dc;
  border-radius: var(--radius);
  padding: 1px;
}

.extra-icon {
  width: 28px;
  height: 28px;
  object-fit: contain;
}

.extra-item figcaption {
  margin-top: 4px;
  font-size: 12px;
  color: #fff;
}

/* ====== 视频/图集通用 ====== */
.pic-card {
  margin: 0 16px;
  border-radius: var(--radius);
  overflow: hidden;
}

.pic-card img {
  width: 100%;
  display: block;
}

/* 让控制条跟着父级一起圆角 */
.video-box {
  position: relative;
  margin: 0 16px;
  border-radius: 12px;
  overflow: hidden;
  background: #f2f2f7;
  height: 650px;
  padding-bottom: 62.5%;   /* 16:10 比例（=10/16） */
  border: 1px solid var(--line);
}
.video-box video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}


.img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.sec {
  padding: 30px 16px 40px;
}

/* 图片介绍区整体白底 */
#future {
  background: #fff;
  margin: 12px 0;
  padding: 24px 0;
}

/* 单张白卡 */
.pic-card {
  margin: 0 26px 12px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

/* 白卡下方灰色通栏分隔线 */
.gap-gray {
  width: 100%;
  height: 10px;
  margin-bottom: 36px;
  background: #f0f0f0;
}

/* 独立文字块（如需） */
.pic-txt {
  text-align: center;
  padding: 16px 16px 28px;
  font-size: 17px;
  color: #ff0000;
  font-weight: 700;
}

/* ====== 分享板块（一键复制） ====== */
.share-box {
  text-align: center;
  padding: 0 16px 20px;
}

.share-desc {
  font-size: 15px;
  color: var(--txt2);
  margin-bottom: 24px;
}

.share-link-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  margin-top: 24px;
}

.share-input {
  flex: 1 1 240px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 14px;
  background: #fff;
  color: var(--txt);
}

.share-btn {
  padding: 10px 20px;   /* 左右留足空白，一行字绝不会断 */
  border: none;
  border-radius: var(--radius);
  background: var(--deep);
  color: #fff;
  font-size: 14px;
  cursor: pointer;
  white-space: nowrap;  /* 关键：强制不换行 */
  transition: filter .3s;
}

.share-btn:hover {
  filter: brightness(1.1);
}

.qq-row{
  margin-top:32px;          /* 距上边 20px */
  line-height:32px;         /* 与图片同高，保证垂直居中 */
  font-size:16px;           /* 按需 */
  color: #000;
}
.qq-row img{
  vertical-align:middle;    /* 图片在行内垂直居中 */
  margin:0 3px;             /* 左右小间隙 */
}