/* ============================================================
   代办锁屏 · 下载页 —— Liquid Glass (iOS 26) + 光感
   技术参考：
   - backdrop-filter blur/saturate 玻璃底
   - ::before 顶部镜面高光(模拟折射)
   - inset 内发光边缘 + feSpecularLighting
   ============================================================ */
* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --accent: #7c5cff;
  --accent2: #4fc3ff;
  --text: #f5f7ff;
  --dim: rgba(245,247,255,.64);
  --faint: rgba(245,247,255,.42);
  --stroke: rgba(255,255,255,.16);
}
html { scroll-behavior: smooth; }
body {
  background: #060912;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  min-height: 100vh;
}

/* 背景光感 */
.bg { position: fixed; inset: 0; z-index: -2; background: radial-gradient(120% 100% at 50% 0%, #141b33 0%, #0a0f1e 55%, #060912 100%); }
.blob { position: fixed; border-radius: 50%; filter: blur(90px); opacity: .4; pointer-events: none; z-index: -1; }
.blob.b1 { width: 55vmax; height: 55vmax; left: -12vmax; top: -12vmax; background: radial-gradient(circle, #4f5bd5, transparent 65%); animation: drift1 24s ease-in-out infinite; }
.blob.b2 { width: 50vmax; height: 50vmax; right: -12vmax; bottom: -12vmax; background: radial-gradient(circle, #0aa8d8, transparent 65%); animation: drift2 30s ease-in-out infinite; }
.blob.b3 { width: 36vmax; height: 36vmax; left: 55%; top: 42%; background: radial-gradient(circle, #7c5cff, transparent 65%); opacity: .28; animation: drift1 34s ease-in-out infinite reverse; }
@keyframes drift1 { 0%,100% { transform: translate(0,0) scale(1); } 50% { transform: translate(6%,8%) scale(1.14); } }
@keyframes drift2 { 0%,100% { transform: translate(0,0) scale(1); } 50% { transform: translate(-6%,-6%) scale(1.1); } }

/* ============ Liquid Glass 核心 ============ */
.liquid {
  position: relative;
  border-radius: 24px;
  background: linear-gradient(135deg, rgba(255,255,255,.14), rgba(255,255,255,.03));
  backdrop-filter: blur(28px) saturate(180%);
  -webkit-backdrop-filter: blur(28px) saturate(180%);
  border: 1px solid rgba(255,255,255,.20);
  box-shadow:
    0 20px 60px rgba(0,0,0,.40),
    inset 0 1px 0 rgba(255,255,255,.30),
    inset 0 -1px 0 rgba(255,255,255,.06),
    inset 1px 0 0 rgba(255,255,255,.10),
    inset -1px 0 0 rgba(255,255,255,.10);
}
/* 顶部镜面高光（模拟液体折射反光） */
.liquid::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(130% 70% at 50% -20%, rgba(255,255,255,.55), rgba(255,255,255,0) 50%),
    linear-gradient(180deg, rgba(255,255,255,.16), rgba(255,255,255,0) 32%);
  opacity: .55;
}
.liquid > * { position: relative; z-index: 1; }

/* SVG 图标（SF Symbols 风格，无 emoji） */
.ic { width: 1em; height: 1em; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; display: inline-block; vertical-align: -0.14em; }
.ic.filled { fill: currentColor; stroke: none; }

/* 布局 */
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

header { position: sticky; top: 0; z-index: 10; padding: 14px 0; backdrop-filter: blur(22px) saturate(160%); -webkit-backdrop-filter: blur(22px) saturate(160%); background: rgba(6,9,18,.45); border-bottom: 1px solid var(--stroke); }
.nav { display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 17px; }
.brand-logo { width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center; background: linear-gradient(135deg, var(--accent), var(--accent2)); color: #fff; box-shadow: 0 0 22px rgba(124,92,255,.6); }
.brand-logo .ic { width: 16px; height: 16px; }
.badge { font-size: 11px; padding: 3px 10px; border-radius: 999px; background: rgba(124,92,255,.2); border: 1px solid rgba(124,92,255,.5); color: #c9c2ff; }
.nav-links { display: flex; gap: 22px; font-size: 14px; color: var(--dim); }
.nav-links a { color: var(--dim); text-decoration: none; transition: color .2s; }
.nav-links a:hover { color: var(--text); }

.hero { text-align: center; padding: 90px 0 60px; }
.hero .tag { display: inline-flex; align-items: center; gap: 7px; font-size: 12.5px; padding: 7px 15px; border-radius: 999px; background: rgba(255,255,255,.07); border: 1px solid var(--stroke); color: var(--dim); margin-bottom: 24px; }
.hero h1 { font-size: clamp(44px, 7.5vw, 76px); font-weight: 800; letter-spacing: 1px; background: linear-gradient(180deg, #fff, #b9c4ff); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; filter: drop-shadow(0 0 40px rgba(124,92,255,.35)); }
.hero p { margin: 18px auto 0; font-size: 18px; color: var(--dim); max-width: 640px; line-height: 1.8; }
.hero .actions { margin-top: 36px; display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

.btn { display: inline-flex; align-items: center; gap: 9px; padding: 15px 28px; border-radius: 16px; font-size: 16px; font-weight: 700; cursor: pointer; text-decoration: none; border: none; font-family: inherit; transition: transform .15s, box-shadow .2s, filter .2s; }
.btn:active { transform: scale(.97); }
.btn .ic { width: 18px; height: 18px; }
.btn-primary { background: linear-gradient(135deg, var(--accent), var(--accent2)); color: #fff; box-shadow: 0 10px 30px rgba(124,92,255,.45), inset 0 1px 0 rgba(255,255,255,.25); }
.btn-primary:hover { filter: brightness(1.08); box-shadow: 0 14px 40px rgba(124,92,255,.6); }
.btn-ghost { background: rgba(255,255,255,.07); color: var(--text); border: 1px solid var(--stroke); backdrop-filter: blur(16px); }
.btn-ghost:hover { background: rgba(255,255,255,.13); }

section { padding: 52px 0; }
.section-title { text-align: center; font-size: 30px; font-weight: 800; margin-bottom: 8px; }
.section-sub { text-align: center; color: var(--dim); font-size: 15px; margin-bottom: 40px; }

.features { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
.feature { padding: 24px; border-radius: 20px; }
.feature .ico { width: 48px; height: 48px; border-radius: 14px; display: grid; place-items: center; margin-bottom: 14px; background: linear-gradient(135deg, rgba(124,92,255,.28), rgba(79,195,255,.18)); border: 1px solid rgba(255,255,255,.14); color: #cdd5ff; }
.feature .ico .ic { width: 24px; height: 24px; }
.feature h3 { font-size: 17px; margin-bottom: 8px; }
.feature p { font-size: 13.5px; color: var(--dim); line-height: 1.7; }

.download-card { border-radius: 28px; padding: 52px 30px; text-align: center; }
.download-card h2 { font-size: 30px; font-weight: 800; margin-bottom: 12px; }
.download-card p { color: var(--dim); font-size: 15px; margin-bottom: 28px; }
.os { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--dim); margin-top: 20px; }
.os .ic { width: 15px; height: 15px; }

.author-card { border-radius: 28px; padding: 46px 30px; display: flex; flex-direction: column; align-items: center; gap: 16px; text-align: center; }
.avatar { width: 78px; height: 78px; border-radius: 50%; display: grid; place-items: center; background: linear-gradient(135deg, var(--accent), var(--accent2)); box-shadow: 0 0 32px rgba(124,92,255,.55); }
.avatar .ic { width: 36px; height: 36px; color: #fff; }
.author-card h2 { font-size: 24px; font-weight: 800; }
.author-card .names { color: var(--dim); font-size: 14px; }
.author-card .bio { max-width: 660px; color: var(--dim); font-size: 15px; line-height: 2; }
.author-card .bio b { color: var(--text); font-weight: 700; }

footer { text-align: center; padding: 28px 0 40px; color: var(--faint); font-size: 13px; border-top: 1px solid var(--stroke); margin-top: 20px; }

/* 入场动画 */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

@media (max-width: 640px) { .nav-links { display: none; } .hero { padding: 60px 0 40px; } }