/* ============================================================
   屿现 YUXIAN · 官网设计系统 (main.css)
   唯一色调来源：_yuxian-assets/DESIGN-yuxian.md §2
   ============================================================ */
:root{
  --yx-rose:#F5319C; --yx-rose-deep:#E01A78; --yx-rose-deeper:#C41066;
  --yx-pink:#F8499C; --yx-pink-2:#FB53A4; --yx-pink-soft:#F57CCA;
  --yx-violet:#A81DAC; --yx-indigo:#3212C2; --yx-crimson:#F11771;
  --yx-mist:#FFF8FB; --yx-mist-2:#FFF1F8; --yx-mist-3:#FDE6EB; --yx-mist-4:#F9D7E4;
  --yx-card:#FFFFFF;
  --yx-line:#F5DCE8; --yx-line-2:#EDC6DA;
  --yx-ink:#222222; --yx-ink-2:#777C85; --yx-ink-3:#8E96A6; --yx-ink-4:#B4BBC7;
  --yx-gold:#FFD74D; --yx-gold-2:#FFC032; --yx-sun:#FFE8A3;
  --yx-grad-main:linear-gradient(135deg,#FB53A4 0%,#F5319C 45%,#F11771 100%);
  --yx-grad-violet:linear-gradient(135deg,#F5319C 0%,#A81DAC 55%,#3212C2 100%);
  --yx-grad-page:linear-gradient(180deg,#FFF8FB 0%,#FFF1F8 46%,#FDE6EB 100%);
  --yx-grad-mist:linear-gradient(160deg,#FFFFFF 0%,#FFF1F8 100%);
  --yx-grad-gold:linear-gradient(135deg,#FFE8A3 0%,#FFD74D 55%,#FFC032 100%);
  --yx-sh-card:0 14px 34px -14px rgba(245,49,156,.28);
  --yx-sh-btn:0 10px 24px rgba(245,49,156,.35);
  --yx-sh-glow:0 0 2.25rem rgba(245,49,156,.18);
  --r-lg:28px; --r-md:20px; --r-sm:16px; --r-pill:999px;
  --wrap:1180px;
  --font:-apple-system,BlinkMacSystemFont,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,sans-serif;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;font-family:var(--font);color:var(--yx-ink);
  background:var(--yx-grad-page);background-attachment:fixed;
  font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border:0}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0;font-weight:800;letter-spacing:-.02em;line-height:1.22}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
::selection{background:rgba(245,49,156,.18)}
:focus-visible{outline:2.5px solid var(--yx-rose);outline-offset:3px;border-radius:8px}

.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 24px}
.center{text-align:center}
.space-t{margin-top:44px}

/* ---------- 通用排版 ---------- */
.sec-head{max-width:660px;margin:0 auto 48px;text-align:center}
.kicker{
  display:inline-flex;align-items:center;gap:8px;margin-bottom:16px;
  padding:7px 16px;border-radius:var(--r-pill);
  background:var(--yx-mist-2);border:1px solid var(--yx-line);
  color:var(--yx-rose-deep);font-size:12px;font-weight:800;letter-spacing:.14em;
}
.kicker::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--yx-rose);box-shadow:0 0 0 4px rgba(245,49,156,.16)}
.sec-head h2{font-size:clamp(26px,3.4vw,40px)}
.sec-head p{margin-top:14px;color:var(--yx-ink-2);font-size:16px;line-height:1.8}
.hl{color:var(--yx-rose-deep);font-weight:700}
.grad-text{
  background:var(--yx-grad-main);-webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:transparent;
}

/* ---------- 顶栏 ---------- */
.header{
  position:sticky;top:0;z-index:60;
  background:rgba(255,248,251,.78);
  backdrop-filter:saturate(1.5) blur(18px);-webkit-backdrop-filter:saturate(1.5) blur(18px);
  border-bottom:1px solid rgba(245,49,156,.12);
}
.header .wrap{display:flex;align-items:center;gap:20px;height:74px}
.brand{display:flex;align-items:center;gap:11px;flex:0 0 auto}
.brand img{width:40px;height:40px;border-radius:13px;box-shadow:var(--yx-sh-card)}
.brand .bn{display:flex;flex-direction:column;line-height:1.2}
.brand .bn b{font-size:18px;letter-spacing:.04em}
.brand .bn small{font-size:11px;color:var(--yx-ink-3);letter-spacing:.02em}
.nav{display:flex;align-items:center;gap:4px;margin-left:auto}
.nav a{
  padding:9px 16px;border-radius:var(--r-pill);font-size:15px;font-weight:600;
  color:var(--yx-ink-2);transition:background .22s,color .22s;
}
.nav a:hover{background:var(--yx-mist-2);color:var(--yx-ink)}
.nav a.on{background:#fff;color:var(--yx-rose-deep);box-shadow:0 8px 18px -10px rgba(245,49,156,.45)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  height:52px;padding:0 26px;border-radius:var(--r-pill);
  font-size:16px;font-weight:800;letter-spacing:.01em;cursor:pointer;
  border:2px solid transparent;transition:transform .18s,box-shadow .25s,background .25s;
}
.btn svg{width:19px;height:19px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.btn:active{transform:scale(.975)}
.btn-main{background:var(--yx-grad-main);color:#fff;border-color:#fff;box-shadow:var(--yx-sh-btn)}
.btn-main:hover{box-shadow:0 14px 30px rgba(245,49,156,.45);transform:translateY(-2px)}
.btn-sub{background:#fff;color:var(--yx-rose-deep);border-color:var(--yx-line-2);box-shadow:var(--yx-sh-card)}
.btn-sub:hover{border-color:var(--yx-rose);transform:translateY(-2px)}
.btn-dark{background:#222;color:#fff}
.btn-mini{
  display:inline-flex;align-items:center;gap:7px;height:42px;padding:0 18px;
  border-radius:var(--r-pill);font-size:14px;font-weight:800;
  background:var(--yx-grad-main);color:#fff;border:2px solid #fff;
  box-shadow:var(--yx-sh-btn);transition:transform .18s,box-shadow .25s;
}
.btn-mini:hover{transform:translateY(-1px);box-shadow:0 12px 26px rgba(245,49,156,.42)}
.btn-mini svg{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}

/* ---------- 母题 ---------- */
.halo{
  position:absolute;pointer-events:none;z-index:0;filter:blur(2px);
  background:radial-gradient(circle,rgba(245,49,156,.30) 0%,rgba(245,49,156,.10) 45%,rgba(245,49,156,0) 68%);
  border-radius:50%;
}
.sparkle{
  position:absolute;z-index:2;pointer-events:none;
  width:20px;height:20px;color:#fff;opacity:.9;
  animation:yxTwinkle 2.6s ease-in-out infinite;
}
.sparkle svg{width:100%;height:100%;fill:currentColor}
.sparkle.gold{color:var(--yx-gold)}
@keyframes yxTwinkle{0%,100%{transform:scale(.75) rotate(0);opacity:.45}50%{transform:scale(1.1) rotate(12deg);opacity:1}}

.pill-dark{
  display:inline-flex;align-items:center;gap:8px;
  padding:9px 20px;border-radius:var(--r-pill);
  background:#222;color:#fff;font-size:14px;font-weight:700;letter-spacing:.04em;
}
.pill-dark i{width:5px;height:5px;border-radius:50%;background:var(--yx-gold);font-style:normal}

.glass{
  background:rgba(255,255,255,.72);
  backdrop-filter:blur(14px) saturate(1.3);-webkit-backdrop-filter:blur(14px) saturate(1.3);
  border:1px solid rgba(245,49,156,.18);
  border-radius:var(--r-pill);
}

.card{
  position:relative;background:var(--yx-card);
  border-radius:var(--r-lg);box-shadow:var(--yx-sh-card);
  border:2px solid #fff;overflow:hidden;
}
.card::before{
  content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;
  background:linear-gradient(160deg,rgba(255,255,255,.9) 0%,rgba(255,241,248,.55) 48%,rgba(253,230,235,.35) 100%);
  opacity:.9;
}
.card>*{position:relative;z-index:1}

.sticker{transform:rotate(-2.5deg);border:6px solid #fff;box-shadow:var(--yx-sh-card);border-radius:var(--r-md)}
.sticker.alt{transform:rotate(2.5deg)}

/* ---------- 页脚 ---------- */
.footer{margin-top:96px;background:#fff;border-top:1px solid var(--yx-line);position:relative;overflow:hidden}
.footer::before{
  content:"";position:absolute;top:-120px;left:50%;transform:translateX(-50%);
  width:560px;height:240px;border-radius:50%;
  background:radial-gradient(circle,rgba(245,49,156,.16),transparent 68%);
}
.footer .wrap{position:relative;z-index:1;padding-top:52px;padding-bottom:40px}
.f-brand{display:flex;align-items:center;gap:12px}
.f-brand img{width:46px;height:46px;border-radius:14px;box-shadow:var(--yx-sh-card)}
.f-brand span{display:flex;flex-direction:column;line-height:1.35}
.f-brand b{font-size:19px;letter-spacing:.04em}
.f-brand small{font-size:12px;color:var(--yx-ink-3)}
.f-nav{display:flex;flex-wrap:wrap;gap:8px;margin:26px 0 24px}
.f-nav a{padding:7px 15px;border-radius:var(--r-pill);background:var(--yx-mist-2);font-size:14px;font-weight:600;color:var(--yx-ink-2);transition:.2s}
.f-nav a:hover{background:var(--yx-mist-3);color:var(--yx-rose-deep)}
.f-line{height:1px;background:linear-gradient(90deg,transparent,rgba(245,49,156,.35),transparent);margin:8px 0 22px}
.f-meta{display:grid;gap:7px;font-size:13px;color:var(--yx-ink-3);line-height:1.85}
.f-meta a{color:var(--yx-ink-3);border-bottom:1px dashed var(--yx-line-2)}
.f-meta a:hover{color:var(--yx-rose-deep)}
.f-copy{color:var(--yx-ink-2);font-weight:700}

/* ---------- 响应 ---------- */
@media (max-width:900px){
  .header .wrap{height:auto;flex-wrap:wrap;row-gap:4px;padding-top:10px;padding-bottom:9px}
  .brand .bn small{display:none}
  .brand img{width:34px;height:34px}
  .header .btn-mini{order:2;margin-left:auto;height:38px;padding:0 15px;font-size:13px}
  .nav{
    order:3;width:100%;margin-left:0;gap:6px;padding:2px 0 0;
    overflow-x:auto;scrollbar-width:none;-ms-overflow-style:none;
  }
  .nav::-webkit-scrollbar{display:none}
  .nav a{padding:7px 13px;font-size:13.5px;white-space:nowrap;background:rgba(255,255,255,.72)}
  .nav a.on{background:#fff}
  .footer{margin-top:64px}
}
@media (max-width:520px){
  .wrap{padding:0 18px}
  .btn{height:48px;padding:0 20px;font-size:15px}
  .sec-head{margin-bottom:32px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .sparkle{animation:none}
}