:root {
	--primary: #5b8cff;
	--bg-dark: #0f1220;
	--bg-card: #161a2f;
	--text-main: #ffffff;
	--text-sub: #9aa4c7;
	--border-soft: rgba(255, 255, 255, 0.08);
}

* {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
		"PingFang SC", "Microsoft YaHei", sans-serif;
}

body {
	background: radial-gradient(1200px 600px at 20% 0%, #1b2150, var(--bg-dark));
	color: var(--text-main);
	min-height: 100vh;
}

header {
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 28px 60px;
	border-bottom: 1px solid var(--border-soft);
}

.logo {
	display: flex;
	align-items: center;
	gap: 14px;
}

.logo img {
	width: 44px;
	height: 44px;
	object-fit: contain;
}

.logo span {
	font-size: 20px;
	font-weight: 600;
	letter-spacing: 1px;
}

main {
	max-width: 1100px;
	margin: 0 auto;
	padding: 60px 40px 100px;
	text-align: center;
}

h1 {
	font-size: 48px;
	font-weight: 700;
	margin-bottom: 24px;
	line-height: 1.25;
}

h1 strong {
	color: var(--primary);
}

.desc {
	font-size: 18px;
	line-height: 1.8;
	color: var(--text-sub);
	max-width: 780px;
	margin: 0 auto 60px;
}

.features {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
	gap: 24px;
	margin-bottom: 70px;
}

.card {
	background: linear-gradient(180deg, #1b2040, var(--bg-card));
	border: 1px solid var(--border-soft);
	border-radius: 16px;
	padding: 32px 26px;
	text-align: left;
	backdrop-filter: blur(6px);
}

.card h3 {
	font-size: 18px;
	margin-bottom: 14px;
}

.card p {
	font-size: 14px;
	color: var(--text-sub);
	line-height: 1.7;
}

.download {
	display: inline-flex;
	align-items: center;
	gap: 14px;
	padding: 18px 36px;
	background: linear-gradient(135deg, var(--primary), #7aa2ff);
	color: #fff;
	border-radius: 999px;
	font-size: 18px;
	font-weight: 600;
	text-decoration: none;
	box-shadow: 0 10px 40px rgba(91, 140, 255, 0.35);
	transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.download:hover {
	transform: translateY(-2px);
	box-shadow: 0 14px 50px rgba(91, 140, 255, 0.5);
}

.platform {
	margin-top: 16px;
	font-size: 14px;
	color: var(--text-sub);
}

footer {
	text-align: center;
	padding: 40px 20px;
	font-size: 13px;
	color: var(--text-sub);
	border-top: 1px solid var(--border-soft);
}



/* Down */
/* 按钮行 */
.bmt-download {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-top: 24px;
  flex-wrap: wrap;
}

/* 按钮主体 */
.bmt-btn {
  width: 300px;
  height: 90px;
  border-radius: 26px;
  text-decoration: none;
  color: #ffffff;

  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;

  position: relative;
  overflow: hidden;

  box-shadow:
    0 14px 44px rgba(60, 110, 255, 0.28),
    inset 0 1px 0 rgba(255, 255, 255, 0.18);

  transition: transform .18s ease, box-shadow .18s ease;
}

/* 上半部分柔光 */
.bmt-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(255,255,255,0.22) 0%,
    rgba(255,255,255,0.06) 45%,
    rgba(255,255,255,0) 70%
  );
  pointer-events: none;
}

/* 标题 */
.bmt-title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 2px;
  line-height: 1;
  display: flex;
  align-items: center;
}

/* 副说明 */
.bmt-sub {
  font-size: 14px;
  font-weight: 400;
  opacity: 0.85;
}

/* 64 位（亮蓝） */
.bmt-64 {
  background: linear-gradient(
    180deg,
    #5f8dff 0%,
    #2f63ff 100%
  );
}

/* 32 位（深蓝） */
.bmt-32 {
  background: linear-gradient(
    180deg,
    #4f6fae 0%,
    #2f4b8f 100%
  );
  box-shadow:
    0 14px 44px rgba(50, 80, 150, 0.28),
    inset 0 1px 0 rgba(255, 255, 255, 0.14);
}

/* hover：只做轻微抬起（你截图里并不夸张） */
.bmt-btn:hover {
  transform: translateY(-2px);
  box-shadow:
    0 18px 56px rgba(60, 110, 255, 0.38),
    inset 0 1px 0 rgba(255, 255, 255, 0.22);
}

.bmt-32:hover {
  box-shadow:
    0 18px 56px rgba(50, 80, 150, 0.38),
    inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

/* 底部说明 */
.bmt-download-tip {
  margin-top: 22px;
  text-align: center;
  font-size: 18px;
  color: rgba(210, 225, 255, 0.85);
}