:root {
  --primary: #C8102E;
  --primary-dark: #8B0000;
  --primary-light: #E8445A;
  --secondary: #1A1A2E;
  --accent: #FF6B35;
  --vw-pink: #ff71ce;
  --vw-cyan: #01cdfe;
  --vw-purple: #b967ff;
  --vw-yellow: #fffb96;
  --vw-deep: #1a0033;
}

/* 蒸汽波全局背景 */
body {
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(255,113,206,.28), transparent 70%),
    radial-gradient(ellipse 70% 50% at 90% 30%, rgba(1,205,254,.22), transparent 70%),
    linear-gradient(180deg, #2b0050 0%, #3d0066 35%, #6b0f7a 65%, #1a0033 100%);
  background-attachment: fixed;
}

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: #1a0033; }
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--vw-pink), var(--vw-cyan));
  border-radius: 6px;
}
::-webkit-scrollbar-thumb:hover { background: var(--vw-pink); }

::selection { background: var(--vw-pink); color: #1a0033; }

/* 霓虹辉光文字 */
.neon-pink {
  color: var(--vw-pink);
  text-shadow: 0 0 6px var(--vw-pink), 0 0 18px rgba(255,113,206,.7), 0 0 36px rgba(255,113,206,.4);
}
.neon-cyan {
  color: var(--vw-cyan);
  text-shadow: 0 0 6px var(--vw-cyan), 0 0 18px rgba(1,205,254,.7), 0 0 36px rgba(1,205,254,.4);
}
.text-gradient {
  background: linear-gradient(90deg, var(--vw-pink), var(--vw-yellow), var(--vw-cyan));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* 复古宽体大标题 */
.vw-display {
  font-family: 'Times New Roman', 'Songti SC', serif;
  letter-spacing: .04em;
}

/* 霓虹边框卡片 */
.vw-card {
  background: rgba(26, 0, 51, .55);
  border: 1px solid rgba(255,113,206,.45);
  box-shadow: 0 0 0 1px rgba(1,205,254,.15) inset, 0 8px 30px rgba(0,0,0,.45);
  backdrop-filter: blur(6px);
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
}
.vw-card:hover {
  transform: translateY(-6px);
  border-color: var(--vw-cyan);
  box-shadow: 0 0 24px rgba(1,205,254,.35), 0 12px 40px rgba(0,0,0,.55);
}

/* 网格地平线 */
.vw-grid {
  background-image:
    linear-gradient(rgba(1,205,254,.55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,113,206,.45) 1px, transparent 1px);
  background-size: 44px 44px;
  transform: perspective(320px) rotateX(72deg);
  transform-origin: center bottom;
}

/* 复古落日 */
.vw-sun {
  background: linear-gradient(180deg, var(--vw-yellow) 0%, var(--vw-pink) 55%, var(--vw-purple) 100%);
  border-radius: 50%;
  box-shadow: 0 0 60px rgba(255,113,206,.7), 0 0 120px rgba(255,251,150,.4);
}

/* 扫描线叠层 */
.vw-scanlines {
  position: relative;
}
.vw-scanlines::after {
  content: "";
  position: absolute; inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    0deg, rgba(0,0,0,.18) 0px, rgba(0,0,0,.18) 1px, transparent 2px, transparent 4px);
}

/* 霓虹分隔线 */
.vw-rule {
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--vw-pink), var(--vw-cyan), transparent);
}

/* 闪烁动画 */
@keyframes vw-flicker {
  0%, 19%, 21%, 23%, 25%, 54%, 56%, 100% { opacity: 1; }
  20%, 24%, 55% { opacity: .55; }
}
.vw-flicker { animation: vw-flicker 4s infinite; }

@keyframes vw-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
.vw-float { animation: vw-float 6s ease-in-out infinite; }

/* 移动端抽屉导航 */
.nav { transition: transform .3s ease; }
@media (max-width: 1023px) {
  .nav {
    position: fixed; top: 0; right: 0; bottom: 0;
    width: 82%; max-width: 320px;
    flex-direction: column;
    background: linear-gradient(180deg, #2b0050, #1a0033);
    border-left: 2px solid var(--vw-pink);
    padding: 5.5rem 1.75rem 2rem;
    transform: translateX(100%);
    z-index: 60; overflow-y: auto;
  }
  .nav.active { transform: translateX(0); }
  .menu-overlay {
    position: fixed; inset: 0;
    background: rgba(26,0,51,.7);
    opacity: 0; visibility: hidden;
    transition: opacity .3s ease;
    z-index: 55;
  }
  .menu-overlay.active { opacity: 1; visibility: visible; }
  body.menu-open { overflow: hidden; }
}

/* FAQ 折叠 */
.faq-answer {
  max-height: 0; overflow: hidden; opacity: 0;
  transition: max-height .3s ease, opacity .3s ease;
}
.faq-icon { transition: transform .25s ease; }

/* 分类 Tab 激活态 */
.cat-tab.active {
  background: linear-gradient(90deg, var(--vw-pink), var(--vw-purple));
  color: #1a0033;
  box-shadow: 0 0 16px rgba(255,113,206,.6);
}

/* 回到顶部 */
.back-to-top {
  opacity: 0; visibility: hidden;
  transition: opacity .3s ease;
}
.back-to-top.visible { opacity: 1; visibility: visible; }

@media print {
  header, footer, nav, .no-print { display: none !important; }
  body { background: #fff; color: #000; }
}