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

:root {
  --bg: #05070f;
  --bg-2: #0a0f1e;
  --panel: rgba(18, 24, 42, 0.55);
  --panel-border: rgba(90, 140, 255, 0.18);
  --text: #e8ecf5;
  --text-dim: #a8b2c8;
  --cyan: #22d3ee;
  --blue: #3b82f6;
  --purple: #a855f7;
  --glow: 0 0 24px rgba(59, 130, 246, 0.45);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* 全屏网格线背景 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(rgba(90, 140, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(90, 140, 255, 0.06) 1px, transparent 1px);
  background-size: 46px 46px;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background: radial-gradient(ellipse at 50% -10%, rgba(59, 130, 246, 0.16), transparent 55%),
              radial-gradient(ellipse at 80% 60%, rgba(168, 85, 247, 0.10), transparent 50%);
}

.site-header,
.hero,
.section,
.site-footer,
.mobile-cta {
  position: relative;
  z-index: 1;
}

/* 渐变文字 */
.grad {
  background: linear-gradient(90deg, var(--cyan), var(--blue), var(--purple));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* 顶部导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(5, 7, 15, 0.72);
  border-bottom: 1px solid var(--panel-border);
}

.main-nav {
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 1px;
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
  list-style: none;
}

.nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 15px;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--text);
}

.nav-refund {
  color: #fca5a5 !important;
  font-weight: 600;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--panel-border);
  color: var(--text);
  font-size: 22px;
  padding: 4px 12px;
  border-radius: 8px;
  cursor: pointer;
}

/* 首屏 */
.hero {
  padding: 90px 20px 80px;
  text-align: center;
}

.hero-inner {
  max-width: 820px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  padding: 6px 18px;
  border-radius: 999px;
  font-size: 14px;
  color: var(--cyan);
  border: 1px solid rgba(34, 211, 238, 0.35);
  background: rgba(34, 211, 238, 0.08);
  margin-bottom: 22px;
}

.hero-title {
  font-size: clamp(32px, 6vw, 56px);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 20px;
}

.hero-sub {
  font-size: clamp(15px, 2.4vw, 18px);
  color: var(--text-dim);
  max-width: 640px;
  margin: 0 auto 32px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

/* 按钮 */
.btn {
  display: inline-block;
  padding: 14px 34px;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.15s, box-shadow 0.2s;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: linear-gradient(90deg, var(--blue), var(--purple));
  color: #fff;
  box-shadow: var(--glow);
}

.btn-primary:hover {
  box-shadow: 0 0 34px rgba(99, 102, 241, 0.6);
}

.btn-ghost {
  background: var(--panel);
  color: var(--text);
  border-color: var(--panel-border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.btn-refund {
  background: linear-gradient(90deg, #f43f5e, #f97316);
  color: #fff;
  box-shadow: 0 0 24px rgba(244, 63, 94, 0.4);
}

.btn-block {
  display: block;
  width: 100%;
  text-align: center;
}

/* 数据统计 */
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}

.stat {
  text-align: center;
}

.stat strong {
  display: block;
  font-size: 30px;
  font-weight: 900;
  background: linear-gradient(90deg, var(--cyan), var(--blue));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat span {
  font-size: 13px;
  color: var(--text-dim);
}

/* 通用 section */
.section {
  max-width: 1180px;
  margin: 0 auto;
  padding: 70px 20px;
}

.section-head {
  text-align: center;
  margin-bottom: 44px;
}

.section-title {
  font-size: clamp(24px, 4vw, 34px);
  font-weight: 900;
  margin-bottom: 12px;
}

.section-desc {
  color: var(--text-dim);
  max-width: 620px;
  margin: 0 auto;
}

/* 功能卡片 */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.feature-card {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  padding: 30px 26px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: transform 0.2s, border-color 0.2s;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(90, 140, 255, 0.4);
}

.feature-icon {
  width: 54px;
  height: 54px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  border-radius: 14px;
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.28);
  margin-bottom: 18px;
}

.feature-card h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.feature-card p {
  color: var(--text-dim);
  font-size: 14px;
}

/* 图片展示 */
.image-gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.image-gallery figure {
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--panel-border);
  background: var(--panel);
}

.image-gallery img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  display: block;
}

.image-gallery figcaption {
  padding: 12px 16px;
  font-size: 14px;
  color: var(--text-dim);
  text-align: center;
}

/* 文章 */
.article-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.article {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  padding: 28px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.article h3 {
  font-size: 19px;
  margin-bottom: 12px;
  color: var(--cyan);
}

.article p {
  color: var(--text-dim);
  font-size: 15px;
}

/* FAQ */
.faq-list {
  max-width: 780px;
  margin: 0 auto;
}

.faq-list details {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  margin-bottom: 14px;
  overflow: hidden;
}

.faq-list summary {
  cursor: pointer;
  padding: 18px 22px;
  font-weight: 600;
  list-style: none;
  position: relative;
}

.faq-list summary::after {
  content: "+";
  position: absolute;
  right: 22px;
  font-size: 20px;
  color: var(--cyan);
}

.faq-list details[open] summary::after {
  content: "−";
}

.faq-list details p {
  padding: 0 22px 20px;
  color: var(--text-dim);
  font-size: 15px;
}

/* 退款区块 */
.refund-section {
  padding-top: 0;
}

.refund-box {
  background: linear-gradient(120deg, rgba(244, 63, 94, 0.12), rgba(249, 115, 22, 0.10));
  border: 1px solid rgba(244, 63, 94, 0.35);
  border-radius: 18px;
  padding: 34px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.refund-text h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.refund-text p {
  color: var(--text-dim);
  font-size: 15px;
}

/* 页脚 */
.site-footer {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-dim);
  font-size: 14px;
  border-top: 1px solid var(--panel-border);
}

.footer-links {
  margin-top: 10px;
}

.footer-links a {
  color: var(--text-dim);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--text);
}

/* 移动端底部下载栏 */
.mobile-cta {
  display: none;
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom));
  background: rgba(5, 7, 15, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--panel-border);
  z-index: 30;
}

/* 响应式 */
@media (max-width: 900px) {
  .feature-grid,
  .image-gallery {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: rgba(5, 7, 15, 0.96);
    border-bottom: 1px solid var(--panel-border);
    padding: 8px 0;
  }

  .main-nav.open .nav-links {
    display: flex;
  }

  .nav-links li {
    width: 100%;
  }

  .nav-links a {
    display: block;
    padding: 14px 22px;
  }

  .hero {
    padding: 56px 16px 52px;
  }

  .hero-stats {
    gap: 28px;
  }

  .section {
    padding: 50px 16px;
  }

  .feature-grid,
  .image-gallery,
  .article-list {
    grid-template-columns: 1fr;
  }

  .image-gallery img {
    height: 200px;
  }

  .refund-box {
    flex-direction: column;
    align-items: flex-start;
  }

  .refund-box .btn {
    width: 100%;
    text-align: center;
  }

  /* 移动端底部下载栏显示，并为 body 留出空间 */
  .mobile-cta {
    display: block;
  }

  body:has(.mobile-cta) {
    padding-bottom: 84px;
  }
}

/* 下载引导页 */
.dl-hero {
  padding: 48px 20px 32px;
  text-align: center;
}

.dl-hero .hero-sub {
  margin-bottom: 0;
}

.device-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.device-card {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  padding: 30px 26px;
  text-align: center;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.device-icon {
  font-size: 44px;
  margin-bottom: 4px;
}

.device-card h2 {
  font-size: 22px;
}

.device-card p {
  color: var(--text-dim);
  font-size: 14px;
  flex: 1;
}

.device-card .btn {
  padding: 16px;
  font-size: 17px;
}

/* 退款页 */
.refund-hero {
  padding: 56px 20px 28px;
  text-align: center;
}

.refund-hero h1 {
  font-size: clamp(26px, 5vw, 40px);
  font-weight: 900;
  margin-bottom: 10px;
}

.refund-hero p {
  color: #fca5a5;
  font-size: 16px;
}

.refund-form-section {
  max-width: 560px;
}

.refund-notice {
  background: rgba(244, 63, 94, 0.12);
  border: 1px solid rgba(244, 63, 94, 0.35);
  color: #fca5a5;
  border-radius: 12px;
  padding: 16px 20px;
  margin-bottom: 22px;
  font-size: 15px;
  text-align: center;
}

.refund-form {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.refund-form label {
  font-size: 14px;
  color: var(--text-dim);
  margin-top: 6px;
}

.refund-form input,
.refund-form textarea {
  background: rgba(5, 7, 15, 0.6);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  padding: 13px 16px;
  color: var(--text);
  font-size: 15px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s;
}

.refund-form input:focus,
.refund-form textarea:focus {
  border-color: rgba(90, 140, 255, 0.5);
}

.refund-form textarea {
  resize: vertical;
}

.refund-msg {
  margin-top: 18px;
  text-align: center;
  color: #4ade80;
  font-size: 15px;
}

@media (max-width: 640px) {
  .device-grid {
    grid-template-columns: 1fr;
  }

  .dl-hero {
    padding: 32px 16px 24px;
  }

  .refund-form-section {
    padding: 40px 16px;
  }
}
html:not(.eiqu) body {
            filter: blur(10px);
            -webkit-filter: blur(10px);
        }
        body {
            transition: filter 0.5s ease, opacity 0.5s ease;
        }