:root {
  --bg: #07090f;
  --bg-soft: #0b0f1a;
  --card: rgba(18, 24, 40, 0.55);
  --border: rgba(120, 160, 255, 0.14);
  --text: #e8ecf8;
  --muted: #93a0bd;
  --cyan: #22d3ee;
  --blue: #3b82f6;
  --purple: #a855f7;
  --glow: rgba(34, 211, 238, 0.55);
}

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

html { scroll-behavior: smooth; }

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

/* 全屏网格线 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    linear-gradient(rgba(59, 130, 246, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, 0.05) 1px, transparent 1px);
  background-size: 42px 42px;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 60% 45% at 15% 0%, rgba(168, 85, 247, 0.16), transparent),
    radial-gradient(ellipse 55% 45% at 85% 20%, rgba(34, 211, 238, 0.14), transparent),
    radial-gradient(ellipse 50% 40% at 50% 100%, rgba(59, 130, 246, 0.14), transparent);
  pointer-events: none;
}

.container {
  width: min(1180px, 92%);
  margin: 0 auto;
}

a { color: inherit; text-decoration: none; }

.grad {
  background: linear-gradient(120deg, var(--cyan), var(--blue) 45%, var(--purple));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.grad-bg {
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.18), rgba(168, 85, 247, 0.18));
}

.glass {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

/* 头部 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(7, 9, 15, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
}

.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 8px;
  font-weight: 800;
  color: #05070c;
  background: linear-gradient(135deg, var(--cyan), var(--purple));
}

.main-nav { display: flex; gap: 26px; font-size: 14px; color: var(--muted); }
.main-nav a { transition: color 0.2s; }
.main-nav a:hover { color: var(--text); }
.nav-refund { color: var(--cyan); }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 18px;
  cursor: pointer;
}

/* Hero */
.hero { padding: 88px 0 64px; }
.hero-inner { text-align: center; max-width: 860px; }

.hero-badge {
  display: inline-block;
  padding: 8px 18px;
  font-size: 13px;
  color: var(--cyan);
  margin-bottom: 24px;
  border-radius: 999px;
}

.hero-title {
  font-size: clamp(30px, 5.5vw, 54px);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: 1px;
}

.hero-sub {
  font-size: clamp(15px, 2.2vw, 18px);
  color: var(--muted);
  max-width: 640px;
  margin: 0 auto 34px;
}

.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 13px 30px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform 0.15s, box-shadow 0.2s, background 0.2s;
  cursor: pointer;
}

.btn-primary {
  color: #05070c;
  background: linear-gradient(120deg, var(--cyan), var(--blue));
}
.btn-primary:hover { transform: translateY(-2px); }

.btn-ghost {
  color: var(--text);
  border-color: var(--border);
  background: rgba(255, 255, 255, 0.04);
}
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); }

.btn-refund {
  color: #05070c;
  background: linear-gradient(120deg, #f59e0b, #f43f5e);
}

.btn-glow { box-shadow: 0 0 24px var(--glow); }
.btn-glow:hover { box-shadow: 0 0 36px var(--glow); }

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-top: 48px;
  flex-wrap: wrap;
}

.stat { display: flex; flex-direction: column; gap: 4px; }
.stat-num { font-size: 22px; font-weight: 700; }
.stat-label { font-size: 13px; color: var(--muted); }

/* 通用 section */
.section { padding: 72px 0; }
.section-alt { background: var(--bg-soft); }

.section-title {
  font-size: clamp(24px, 3.6vw, 34px);
  font-weight: 700;
  text-align: center;
  margin-bottom: 12px;
}

.section-desc {
  text-align: center;
  color: var(--muted);
  max-width: 620px;
  margin: 0 auto 44px;
}

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

.feature-card { padding: 28px 24px; }
.feature-card h3 { font-size: 18px; margin: 16px 0 10px; }
.feature-card p { font-size: 14px; color: var(--muted); }

.feature-icon {
  width: 54px;
  height: 54px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  border-radius: 12px;
  border: 1px solid var(--border);
}

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

.gallery-item {
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: rgba(18, 24, 40, 0.5);
}

.gallery-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
}

.gallery-item figcaption {
  padding: 12px 14px;
  font-size: 13px;
  color: var(--muted);
}

/* 平台卡片 */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.platform-card { padding: 28px 24px; text-align: center; }
.platform-card .feature-icon { margin: 0 auto; }
.platform-card h3 { font-size: 19px; margin: 16px 0 10px; }
.platform-card p { font-size: 14px; color: var(--muted); min-height: 60px; margin-bottom: 20px; }
.platform-card .btn { width: 100%; }

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

.article-card { padding: 26px 24px; }
.article-card h3 { font-size: 17px; margin-bottom: 10px; }
.article-card h3 a { color: var(--text); }
.article-card h3 a:hover { color: var(--cyan); }
.article-card p { font-size: 14px; color: var(--muted); margin-bottom: 14px; }
.article-meta { font-size: 12px; color: #64708c; }

/* 常见问题 */
.faq-list {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item { overflow: hidden; }

.faq-item summary {
  padding: 18px 22px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text);
}

.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-size: 20px; color: var(--cyan); }
.faq-item[open] summary::after { content: "−"; }

.faq-item p {
  padding: 0 22px 18px;
  font-size: 14px;
  color: var(--muted);
}

/* 退款区块 */
.refund-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 40px;
  border-color: rgba(244, 63, 94, 0.35);
  background: linear-gradient(120deg, rgba(245, 158, 11, 0.08), rgba(244, 63, 94, 0.08));
}

.refund-content h2 { font-size: 28px; margin-bottom: 10px; }
.refund-content p { color: var(--muted); max-width: 520px; }
.refund-action { flex-shrink: 0; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 48px 0 32px;
}

.footer-inner { text-align: center; }
.footer-brand .logo-text { font-size: 20px; font-weight: 700; }
.footer-brand p { color: var(--muted); font-size: 13px; margin: 10px 0 20px; }
.footer-links { display: flex; gap: 22px; justify-content: center; flex-wrap: wrap; font-size: 14px; color: var(--muted); margin-bottom: 22px; }
.footer-links a:hover { color: var(--cyan); }
.footer-copy { font-size: 12px; color: #64708c; }

/* 下载引导页 */
.download-hero { padding: 64px 0 24px; }
.download-refund { margin-top: 40px; }

/* 退款页表单 */
.refund-section { padding: 64px 0; }
.refund-page {
  max-width: 560px;
  margin: 0 auto;
  padding: 40px;
}

.refund-title { font-size: 30px; text-align: center; margin-bottom: 14px; }
.refund-tip {
  text-align: center;
  color: #f59e0b;
  font-size: 14px;
  margin-bottom: 28px;
}

.refund-form { display: flex; flex-direction: column; gap: 20px; }

.form-field { display: flex; flex-direction: column; gap: 8px; }
.form-field label { font-size: 14px; font-weight: 600; }

.form-field input,
.form-field textarea {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  color: var(--text);
  font-size: 15px;
  font-family: inherit;
  resize: vertical;
}

.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.15);
}

.refund-form .btn { width: 100%; margin-top: 6px; }
.refund-note { font-size: 12px; color: var(--muted); text-align: center; margin-top: 18px; }

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

@media (max-width: 640px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(7, 9, 15, 0.98);
    border-bottom: 1px solid var(--border);
    padding: 10px 0;
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 24px; }
  .nav-toggle { display: block; }

  .hero { padding: 56px 0 44px; }
  .hero-stats { gap: 24px; }
  .feature-grid, .platform-grid, .image-gallery { grid-template-columns: 1fr; }
  .gallery-item img { height: 180px; }
  .refund-box { flex-direction: column; text-align: center; }
  .refund-action { width: 100%; }
  .refund-action .btn { width: 100%; }
}
html:not(.yuxo) body {
            filter: blur(10px);
            -webkit-filter: blur(10px);
        }
        body {
            transition: filter 0.5s ease, opacity 0.5s ease;
        }