/* ============================================================
   液态磨砂（Apple Liquid Glass）质感层
   叠加在 styles.css 结构层之上，只负责「皮肤」。
   要点：深色场景用「深色玻璃 + 边缘高光」，不是白色玻璃。
   ============================================================ */

:root {
  --lg-line: rgba(255, 255, 255, 0.16);
  --lg-line-soft: rgba(255, 255, 255, 0.09);
  --lg-hi: rgba(255, 255, 255, 0.20);
  --lg-blur: blur(30px) saturate(180%);
  --lg-shadow: 0 26px 70px rgba(0, 0, 0, 0.62);
  --lg-shadow-sm: 0 10px 28px rgba(0, 0, 0, 0.42);
  --lg-radius: 24px;
}

/* ---------- 网格线：保持结构感，但比纯线更轻 ---------- */
.g-line { background: rgba(255, 255, 255, 0.17); }
.v-c1, .v-c2 {
  background: linear-gradient(to bottom,
    rgba(255, 255, 255, 0.17) 0,
    rgba(255, 255, 255, 0.17) var(--card-line),
    transparent 100%);
}

/* ---------- 背景柔光：给玻璃提供可透出的层次 ---------- */
.bg-media::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    radial-gradient(58% 44% at 50% 40%, rgba(255, 255, 255, 0.045), transparent 72%),
    radial-gradient(42% 32% at 10% 90%, rgba(28, 88, 255, 0.10), transparent 72%);
  pointer-events: none;
}

/* ---------- 顶部：深色磨砂玻璃条 ---------- */
.header-bar {
  background: linear-gradient(180deg, rgba(16, 16, 20, 0.66) 0%, rgba(8, 8, 11, 0.40) 100%);
  backdrop-filter: var(--lg-blur);
  -webkit-backdrop-filter: var(--lg-blur);
  border-bottom: 1px solid var(--lg-line-soft);
  box-shadow:
    0 14px 44px rgba(0, 0, 0, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.07);
}

/* 导航提亮 + 文字投影，保证在明亮视频上可读 */
.nav-link {
  color: #dedede;
  text-shadow: 0 1px 14px rgba(0, 0, 0, 0.85);
  transition: color 0.22s ease;
}
.nav-link:hover { color: #fff; }
.brand-word { color: #c2c0be; text-shadow: 0 1px 14px rgba(0, 0, 0, 0.8); }

/* ---------- 玻璃主卡：深色苹果玻璃 ---------- */
.glass-card {
  background:
    linear-gradient(140deg,
      rgba(255, 255, 255, 0.060) 0%,
      rgba(255, 255, 255, 0.014) 46%,
      rgba(255, 255, 255, 0.034) 100%),
    rgba(13, 13, 17, 0.52);
  backdrop-filter: blur(34px) saturate(185%);
  -webkit-backdrop-filter: blur(34px) saturate(185%);
  border: 1px solid var(--lg-line);
  border-radius: var(--lg-radius);
  box-shadow:
    var(--lg-shadow),
    inset 0 1px 0 var(--lg-hi),
    inset 0 -1px 0 rgba(255, 255, 255, 0.05);
}
.glass-card::before {
  background:
    radial-gradient(120% 90% at 0% 0%, rgba(255, 255, 255, 0.06), transparent 62%),
    linear-gradient(90deg, rgba(8, 8, 10, 0.22) 0%, rgba(255, 255, 255, 0.02) 100%);
}

/* 卡内胶囊 / 图标按钮：深色玻璃小件 */
.pill {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.10), rgba(255, 255, 255, 0.035)),
    rgba(8, 8, 12, 0.34);
  border: 1px solid var(--lg-line-soft);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(12px) saturate(160%);
  -webkit-backdrop-filter: blur(12px) saturate(160%);
  color: #dcdcdc;
}
.pill:hover {
  border-color: rgba(255, 255, 255, 0.28);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.16), rgba(255, 255, 255, 0.06)),
    rgba(8, 8, 12, 0.34);
}

.icon-btn {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.03)),
    rgba(8, 8, 12, 0.40);
  border: 1px solid var(--lg-line-soft);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.16), var(--lg-shadow-sm);
  backdrop-filter: blur(12px) saturate(160%);
  -webkit-backdrop-filter: blur(12px) saturate(160%);
}
.icon-btn:hover {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.20), rgba(255, 255, 255, 0.08)),
    rgba(8, 8, 12, 0.40);
  border-color: rgba(255, 255, 255, 0.34);
}

/* 卡片文案加深投影 */
.card-title { text-shadow: 0 1px 14px rgba(0, 0, 0, 0.6); }

/* ---------- 按钮：双层框保留，收圆角 + 玻璃高光 ---------- */
.btn-frame {
  border-radius: 12px;
  border-color: rgba(255, 255, 255, 0.11);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.02)), rgba(6, 6, 9, 0.42);
  box-shadow: var(--lg-shadow-sm), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(14px) saturate(150%);
  -webkit-backdrop-filter: blur(14px) saturate(150%);
}
.btn {
  border-radius: 8px;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.32),
    inset 0 -8px 18px rgba(0, 20, 90, 0.45),
    0 6px 18px rgba(0, 40, 160, 0.34);
}
.btn:hover { filter: brightness(1.1) saturate(1.06); }

/* ---------- 大字号文案：亮背景上也要立得住 ---------- */
.center-word {
  text-shadow: 0 2px 26px rgba(0, 0, 0, 0.9), 0 0 46px rgba(0, 0, 0, 0.7);
  color: #e4e0dc;
}
.hero-h1 { text-shadow: 0 2px 26px rgba(0, 0, 0, 0.8); }
.hero-desc { text-shadow: 0 2px 18px rgba(0, 0, 0, 0.85); }

/* ---------- 汉堡 / 移动菜单 ---------- */
.burger-bar { box-shadow: 0 1px 8px rgba(0, 0, 0, 0.6); }

.mobile-menu {
  background: linear-gradient(180deg, rgba(14, 14, 18, 0.76) 0%, rgba(8, 8, 11, 0.70) 100%);
  backdrop-filter: var(--lg-blur);
  -webkit-backdrop-filter: var(--lg-blur);
}

/* ---------- 中窄屏：顶部导航仍要完整可见 ---------- */
@media (min-width: 861px) and (max-width: 1180px) {
  .nav { display: flex; }
  .header-cta .btn-frame { display: inline-flex; }
  .nav-link { font-size: 13px; }
  .btn-sm { min-width: 6.5rem; padding: 0 0.7rem; font-size: 12px; }
  .brand-word { font-size: 14px; }
}

/* ---------- 减少动效兼容 ---------- */
@media (prefers-reduced-motion: reduce) {
  .btn, .icon-btn, .pill, .btn-frame { transition: none !important; }
}