/* 知月 MCTI · shared base — design tokens, fonts, base layout, header, footer */
@import url('https://fonts.googleapis.com/css2?family=Unbounded:wght@500;700;800;900&family=Manrope:wght@400;500;600;700;800&family=Noto+Sans+SC:wght@300;400;500;700;900&family=JetBrains+Mono:wght@500;700&display=swap');

:root{
  --bg:#FFF5F2; --bg-cream:#F7EDE2; --surface:#FFFFFF;
  --ink:#15121A; --ink-2:#5A535F; --ink-3:#9A929E;
  --line:rgba(21,18,26,.08); --line-strong:rgba(21,18,26,.18);
  --pink:#E91E63; --pink-2:#FF3F87; --pink-soft:#FFD6E1; --pink-wash:#FFE6EB;
  --plum:#7A2C8C; --plum-soft:#E9D5F1;
  --crimson:#C8102E;
  --font-display:"Unbounded","Noto Sans SC","PingFang SC",system-ui,sans-serif;
  --font-cn:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Manrope","Noto Sans SC","PingFang SC",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,monospace;
  --ease:cubic-bezier(.4,0,.2,1); --ease-out:cubic-bezier(.16,1,.3,1);
  --d-fast:150ms; --d-med:320ms; --d-slow:640ms;
  --maxw:1240px; --pad:clamp(20px,4vw,56px);
  --radius-sm:14px; --radius:22px; --radius-lg:32px;
}
*{box-sizing:border-box; -webkit-tap-highlight-color:transparent;}
html,body{margin:0; padding:0;}
html{scroll-behavior:smooth;}
body{
  font-family:var(--font-body); background:var(--bg); color:var(--ink);
  font-size:17px; line-height:1.6; font-weight:400;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
  overflow-x:hidden; position:relative;
}
body::before{
  content:""; position:fixed; inset:0; pointer-events:none; z-index:1;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='220' height='220'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' seed='4'/><feColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 .07 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  mix-blend-mode:multiply; opacity:.5;
}
body::after{
  content:""; position:fixed; inset:0; pointer-events:none; z-index:0;
  background:
    radial-gradient(60vmax 60vmax at 110% -10%, #FFCFE0 0%, transparent 55%),
    radial-gradient(50vmax 50vmax at -10% 110%, #F4D9EE 0%, transparent 55%),
    radial-gradient(40vmax 40vmax at 50% 50%, #FFE7D9 0%, transparent 70%);
  opacity:.85;
}
main, header, footer{position:relative; z-index:2;}
a{color:inherit; text-decoration:none;}
button{font:inherit; cursor:pointer; border:none; background:none; color:inherit;}
img,svg{display:block; max-width:100%;}
h1,h2,h3,h4,h5{font-family:var(--font-cn); font-weight:900; letter-spacing:-.02em; line-height:1.05; margin:0;}
.mono{font-family:var(--font-mono); letter-spacing:.02em;}
::selection{background:var(--pink); color:#fff;}

.shell{max-width:var(--maxw); margin:0 auto; padding-left:var(--pad); padding-right:var(--pad);}
section{padding-top:clamp(56px,7vw,100px); padding-bottom:clamp(56px,7vw,100px); position:relative;}

/* ─── header ─── */
header.site{
  position:sticky; top:0; z-index:50; padding:14px 0;
  backdrop-filter:saturate(140%) blur(18px);
  -webkit-backdrop-filter:saturate(140%) blur(18px);
  background:color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom:1px solid var(--line);
}
.nav{display:flex; align-items:center; justify-content:space-between; gap:24px;}
.brand{display:flex; align-items:center; gap:10px; font-family:var(--font-display); font-weight:800; font-size:22px; letter-spacing:-.03em;}
.brand-mark{
  width:34px; height:34px; border-radius:50%;
  background:linear-gradient(135deg,#FF3F87 0%, #E91E63 55%, #7A2C8C 100%);
  position:relative; box-shadow:0 6px 18px rgba(233,30,99,.28);
}
.brand-mark::after{
  content:""; position:absolute; left:50%; top:50%; transform:translate(-50%,-50%);
  width:14px; height:14px; border-radius:50%;
  background:radial-gradient(circle at 30% 30%, #fff 0%, #FFD6E1 60%, #E91E63 100%);
}
.brand b{font-weight:900;}
.brand span{font-family:var(--font-mono); font-weight:500; font-size:11px; padding:3px 7px; border:1px solid var(--line-strong); border-radius:99px; color:var(--ink-2); letter-spacing:.1em;}
.brand span .ver{font-style:normal; opacity:.7;}
.nav-links{display:flex; align-items:center; gap:28px;}
.nav-links a{
  font-size:14px; font-weight:600; color:var(--ink-2);
  position:relative; transition:color var(--d-fast) var(--ease);
}
.nav-links a.active{color:var(--ink);}
.nav-links a:hover{color:var(--ink);}
.nav-links a::after{
  content:""; position:absolute; left:0; right:0; bottom:-6px;
  height:2px; background:var(--pink); transform:scaleX(0); transform-origin:left;
  transition:transform var(--d-med) var(--ease);
}
.nav-links a:hover::after, .nav-links a.active::after{transform:scaleX(1);}
.nav-cta{
  background:var(--ink); color:#fff; padding:11px 18px; border-radius:99px;
  font-size:13px; font-weight:700; letter-spacing:.01em;
  display:inline-flex; align-items:center; gap:8px;
  transition:transform var(--d-fast) var(--ease), background var(--d-fast) var(--ease);
}
.nav-cta:hover{background:var(--pink); transform:translateY(-1px);}
.nav-cta::after{content:"→";}
/* keep nav-links visible on mobile but compact; hide just 隐藏款 */
@media (max-width:760px){
  .nav-links{display:flex; gap:14px;}
  .nav-links a{font-size:13px; font-weight:600;}
  .nav-links a[href*="hidden.html"]{display:none;}
}

/* ─── shared section header ─── */
.section-head{display:grid; grid-template-columns:1fr; gap:14px; margin-bottom:48px;}
.section-head h1, .section-head h2{font-size:clamp(34px,5vw,64px); letter-spacing:-.035em; line-height:1.02;}
.section-head em{font-style:italic; font-weight:700; color:var(--pink); font-family:var(--font-display);}
.section-head .desc{color:var(--ink-2); max-width:48ch; font-size:16px;}

.eyebrow{
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--font-mono); font-size:12px; font-weight:700;
  letter-spacing:.16em; text-transform:uppercase; color:var(--ink-2);
}
.eyebrow::before{content:""; width:24px; height:1px; background:currentColor; opacity:.5;}

/* back to home link */
.back-link{
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--font-mono); font-size:12px; font-weight:700; letter-spacing:.1em;
  color:var(--ink-2); text-transform:uppercase; margin-bottom:24px;
}
.back-link:hover{color:var(--pink);}

/* ─── final cta block ─── */
.try-cta{
  margin-top:56px;
  background:#15121A; color:#fff;
  border-radius:32px;
  padding:clamp(40px,6vw,80px) clamp(24px,4vw,56px);
  position:relative; isolation:isolate; overflow:hidden;
  text-align:center;
}
.try-cta::before{
  content:""; position:absolute; inset:0; z-index:-1;
  background:
    radial-gradient(50% 60% at 100% 0%, rgba(255,63,135,.6) 0%, transparent 60%),
    radial-gradient(50% 60% at 0% 100%, rgba(122,44,140,.6) 0%, transparent 60%);
}
.try-cta h2{font-size:clamp(28px,4vw,44px); margin-bottom:14px;}
.try-cta p{color:rgba(255,255,255,.72); font-size:15px; max-width:46ch; margin:0 auto;}
.try-cta a.btn{
  display:inline-flex; align-items:center; gap:12px; margin-top:24px;
  font-family:var(--font-cn); font-weight:900; font-size:17px;
  background:#fff; color:var(--ink);
  padding:18px 28px; border-radius:99px;
  transition:transform var(--d-fast) var(--ease);
  box-shadow:0 18px 40px rgba(0,0,0,.2);
}
.try-cta a.btn:hover{transform:translateY(-2px);}
.try-cta a.btn .icon{
  width:28px; height:28px; border-radius:50%;
  background:var(--pink); color:#fff; display:grid; place-items:center; font-size:14px;
  transition:transform var(--d-med) var(--ease);
}
.try-cta a.btn:hover .icon{transform:rotate(45deg) scale(1.1);}

/* ─── footer ─── */
footer.site{
  padding:56px 0 28px;
  border-top:1px solid var(--line);
  margin-top:80px;
}
.foot-grid{display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:32px;}
@media (max-width:900px){.foot-grid{grid-template-columns:1fr 1fr;}}
@media (max-width:560px){.foot-grid{grid-template-columns:1fr;}}
.foot-col h5{font-family:var(--font-mono); font-size:11px; font-weight:700; letter-spacing:.18em; text-transform:uppercase; color:var(--ink-2); margin-bottom:14px;}
.foot-col a{display:block; font-size:14.5px; color:var(--ink); padding:6px 0; transition:color var(--d-fast) var(--ease);}
.foot-col a:hover{color:var(--pink);}
.foot-col.brand-col p{color:var(--ink-2); font-size:14.5px; max-width:34ch; line-height:1.55;}
.foot-bottom{
  margin-top:36px; padding-top:20px; border-top:1px solid var(--line);
  display:flex; justify-content:space-between; gap:14px; flex-wrap:wrap;
  font-family:var(--font-mono); font-size:11.5px; color:var(--ink-3); letter-spacing:.06em;
}

/* reveal */
.reveal{opacity:0; transform:translateY(20px); transition:opacity 600ms var(--ease-out), transform 600ms var(--ease-out);}
.reveal.in{opacity:1; transform:none;}

@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{animation-duration:.001ms !important; transition-duration:.001ms !important;}
  .reveal{opacity:1; transform:none;}
}

/* ─── personality images: fill portrait area + hide placeholder labels ─── */
.h-portrait img, .std-portrait img, .sp-portrait img,
.hc-portrait img, .rh-portrait img, .sc-portrait img {
  position:absolute; inset:0;
  width:100%; height:100%;
  object-fit:cover; object-position:center;
  display:block;
}
.h-portrait:has(img)  .ptag,
.std-portrait:has(img) > span,
.sp-portrait:has(img) .ptag,
.hc-portrait:has(img) .portrait-tag,
.rh-portrait:has(img) .rh-pin,
.sc-portrait:has(img) .sc-pin{
  display:none;
}
/* ensure portrait containers are positioning contexts */
.h-portrait, .std-portrait, .sp-portrait,
.hc-portrait, .rh-portrait, .sc-portrait{ position:relative; }
/* sp-card lock badge stays above image */
.sp-portrait .lock{ z-index:2; }

/* ─── MOBILE TYPOGRAPHY RATIONALIZATION (shared) ─── */
@media (max-width:560px){
  body{font-size:16px;}
  section{padding-top:clamp(40px,7vw,72px); padding-bottom:clamp(40px,7vw,72px);}

  /* Header — single-row, no wrap. Drop ·v1.0, compact nav. */
  header.site{padding:10px 0;}
  .nav{gap:8px; flex-wrap:nowrap; align-items:center;}
  .brand{font-size:17px; gap:6px; letter-spacing:-.02em; min-width:0; flex-shrink:0; white-space:nowrap;}
  .brand b{white-space:nowrap;}
  .brand-mark{width:26px; height:26px; flex:0 0 auto;}
  .brand-mark::after{width:10px; height:10px;}
  .brand span{font-size:9px; padding:2px 5px; letter-spacing:.08em; flex:0 0 auto; white-space:nowrap;}
  .brand span .ver{display:none;}
  .nav-links{display:flex; gap:10px; flex-shrink:1; min-width:0; overflow:hidden;}
  .nav-links a{font-size:12px; font-weight:600; white-space:nowrap;}
  .nav-links a[href*="hidden.html"]{display:none;}
  .nav-cta{font-size:12px; padding:8px 11px; gap:4px; flex:0 0 auto; white-space:nowrap;}
  .nav-cta::after{display:none;}
  /* CTA tail (·又不要钱) hidden on mobile to save room */
  .cta-tail{display:none;}

  .back-link{font-size:11px; margin-bottom:18px;}
  .section-head h1, .section-head h2{font-size:clamp(24px,7vw,30px);}
  .section-head .desc{font-size:14px;}
  .eyebrow{font-size:10.5px;}

  /* Footer compact: 2-col grid, brand spans, hide 关于 col */
  .foot-grid{grid-template-columns:1fr 1fr; gap:24px 18px;}
  .foot-col.brand-col{grid-column:1 / -1;}
  .foot-col:nth-child(3){display:none;}
  .foot-col h5{font-size:10px; margin-bottom:8px;}
  .foot-col a{font-size:13.5px; padding:4px 0;}
  .foot-col.brand-col p{font-size:13.5px;}
  .foot-bottom{font-size:10px; gap:8px; flex-direction:column; align-items:flex-start;}
  footer.site{padding:36px 0 22px; margin-top:48px;}
}

@media (max-width:400px){
  /* iPhone SE / very narrow: drop FAQ link to give brand+CTA full breathing room */
  body{font-size:15.5px;}
  .nav{gap:6px;}
  .brand{font-size:16px; gap:5px;}
  .brand-mark{width:24px; height:24px;}
  .brand span{font-size:8.5px; padding:1.5px 4px;}
  .nav-links{gap:8px;}
  .nav-links a{font-size:11.5px;}
  .nav-links a[href*="faq.html"]{display:none;}
  .nav-cta{padding:7px 10px; font-size:11.5px;}
}