/* ============ 基础 ============ */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  background: #fff;
  -webkit-font-smoothing: antialiased;
}

img { display: block; }

/* ============ 第一部分：Hero（布景图） ============ */
.hero {
  position: relative;
  background: url("assets/hero-bg.jpg") center / cover no-repeat;
}

.topbar {
  padding: 46px 9.03% 0;
}

.logo {
  font-size: clamp(17px, 1.8vw, 26px);
  font-weight: 600;
  color: #fff;
  line-height: 34px;
  text-shadow: 0 1px 6px rgba(120, 50, 0, 0.12);
}

.divider {
  width: 64.03%;
  height: 1px;
  margin: 37px auto 0;
  background: linear-gradient(
    to right,
    rgba(255, 255, 255, 0)    0%,
    rgba(255, 255, 255, 0.2)  35%,
    rgba(255, 255, 255, 0.6)  50%,   /* 中间更亮 */
    rgba(255, 255, 255, 0.2)  65%,
    rgba(255, 255, 255, 0)    100%
  );
}

.hero-content {
  text-align: center;
  padding: 0 24px;
}

.app-title {
  margin-top: 51px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(14px, 1.55vw, 22px);
}

.app-icon {
  width: clamp(44px, 4.86vw, 70px);
  height: auto;
  border-radius: 18%;
  box-shadow: 0 0 16px rgba(255, 255, 255, 0.35);
}

.app-title h1 {
  font-size: clamp(30px, 4.03vw, 58px);
  font-weight: 700;
  color: #fff;
}

.tagline {
  margin-top: 13px;
  font-size: clamp(14px, 1.67vw, 24px);
  font-weight: 400;
  color: rgba(255, 255, 255, 0.94);
}

.intro {
  margin: 23px auto 0;
  max-width: 1000px;
  font-size: clamp(18px, 2.92vw, 42px);
  line-height: 1.167;
  font-weight: 500;
  color: #fff;
  text-shadow: 0px 2px 4px 0px #8F2C0599;
}

/* 桌面端按 1440 设计稿固定高度，保证布景图构图一致 */
@media (min-width: 1024px) {
  .hero { height: 850px; }
}
@media (max-width: 1023px) {
  .hero { padding-bottom: 72px; }
  .topbar { padding-top: 24px; }
  .divider { width: 88%; margin-top: 20px; }
  .app-title { margin-top: 36px; }
}

/* ============ 第二部分：三屏静态图 ============ */
.screens img {
  width: 100%;
  height: auto;
}

/* ============ 第三部分：Footer ============ */
.footer {
  background: #fff;
  text-align: center;
  padding: 60px 24px 64px;
}

.footer h2 {
  font-size: 19px;
  font-weight: 700;
  color: #1b1b1b;
}

.mail {
  margin-top: 17px;
  font-size: 16px;
}

.mail a {
  color: #676767;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.legal {
  margin-top: 9px;
  font-size: 15px;
}

.legal a {
  color: #676767;
  text-decoration: none;
}

.legal a:hover { text-decoration: underline; }

.legal .sep { color: #676767; margin: 0 4px; }

/* 段落固定断行仅桌面端启用 */
.br-lg { display: none; }
@media (min-width: 1024px) {
  .br-lg { display: inline; }
}