/* =====================================================================
   Mantou Marketing — shared design system (馒头行销)
   Direction B · 经纬 · 留白  —  editorial luxury, warm paper + ink + gold.
   Loaded on every page. Component classes are namespaced .site-* / .mm-*.
   ===================================================================== */

:root{
  --paper:#f4efe4;        /* warm paper base                 */
  --surface:#faf7f0;      /* raised surface                  */
  --surface-2:#fffdf8;    /* active / hover surface          */
  --ink:#16130c;          /* near-black ink (headings)       */
  --ink-soft:#2a261d;
  --body:#544d3b;         /* body text                       */
  --muted:#8a8470;        /* muted text                      */
  --faint:#a99a73;        /* faint labels                    */
  --gold:#a9821f;         /* signature gold (light context)  */
  --gold-soft:#c8a24a;    /* brighter gold                   */
  --line:#e2dac9;         /* warm hairline                   */
  --line-2:#ece4d4;       /* lighter hairline                */

  --font-display:"Noto Serif SC","LXGW WenKai",serif;
  --font-body:"LXGW WenKai","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-latin:"Space Grotesk","LXGW WenKai","Noto Sans SC",sans-serif;

  --radius:14px;
  --radius-sm:10px;
  --shadow-sm:0 1px 2px rgba(22,19,12,.05),0 4px 16px rgba(22,19,12,.05);
  --shadow-md:0 8px 30px rgba(22,19,12,.10);
  --maxw:1180px;
  --header-h:68px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 16px)}
body{
  /* each page owns its own background/color/font so dark tool pages stay safe */
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}

/* ---- type ---------------------------------------------------------- */
.mm h1,.mm h2,.mm h3,h1.mm,h2.mm,h3.mm{font-family:var(--font-display);color:var(--ink);font-weight:600;line-height:1.3;letter-spacing:.01em}
.mm-eyebrow{
  font-family:var(--font-latin);font-size:.74rem;font-weight:600;
  letter-spacing:.26em;text-transform:uppercase;color:var(--gold);
  display:inline-flex;align-items:center;gap:.7rem;margin-bottom:1rem;
}
.mm-eyebrow::before{content:"";width:26px;height:2px;background:var(--gold);display:inline-block}

/* ---- layout shells ------------------------------------------------- */
.mm-wrap{max-width:var(--maxw);margin:0 auto;padding:0 1.6rem;width:100%}

/* ---- buttons ------------------------------------------------------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.55rem;
  font-family:var(--font-body);font-size:.96rem;font-weight:600;cursor:pointer;
  padding:.8rem 1.6rem;border-radius:999px;border:1.5px solid transparent;
  transition:transform .15s ease,background .2s ease,color .2s ease,border-color .2s ease;
  text-align:center;line-height:1;
}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.btn-primary:hover{background:#2c2516;border-color:#2c2516}
.btn-gold{background:var(--gold);color:#fff;border-color:var(--gold)}
.btn-gold:hover{background:#8f6c16;border-color:#8f6c16}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--ink);background:rgba(22,19,12,.04)}

/* =====================================================================
   HEADER (shared, responsive, with mobile toggle)
   ===================================================================== */
.site-header{
  position:sticky;top:0;z-index:1000;background:rgba(250,247,240,.92);
  backdrop-filter:saturate(140%) blur(10px);border-bottom:1px solid var(--line);
}
.site-header__bar{display:flex;align-items:center;justify-content:space-between;height:var(--header-h);gap:1.5rem}

/* brand lockup with MM mark */
.site-logo{display:inline-flex;align-items:center;gap:.8rem}
.mm-mark{
  width:38px;height:38px;border-radius:9px;border:1.5px solid rgba(169,130,31,.6);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;flex:none;
  transition:border-color .2s ease,transform .2s ease;
}
.site-logo:hover .mm-mark{border-color:var(--gold);transform:translateY(-1px)}
.mm-mark__t{font-family:var(--font-latin);font-weight:700;font-size:13px;line-height:1;color:var(--gold)}
.mm-mark__u{width:15px;height:2px;border-radius:2px;background:var(--gold)}
.mm-lock{display:flex;flex-direction:column;line-height:1.18}
.mm-lock__cn{font-family:var(--font-display);font-size:1.05rem;font-weight:600;color:var(--ink)}
.mm-lock__en{font-family:var(--font-latin);font-size:.56rem;letter-spacing:.24em;color:var(--faint)}
@media(max-width:480px){.mm-lock__en{display:none}}

.site-nav{display:flex;align-items:center;gap:.2rem}
.site-nav a{
  font-family:var(--font-body);font-size:.95rem;font-weight:500;color:var(--body);
  padding:.5rem .85rem;border-bottom:2px solid transparent;cursor:pointer;
  display:inline-flex;align-items:center;transition:color .15s,border-color .15s;
}
.site-nav a:hover{color:var(--ink)}
.site-nav a.is-active{color:var(--gold);border-bottom-color:var(--gold)}
.site-cta{margin-left:.6rem;border-bottom:none!important;padding:0!important}
.site-burger{display:none;background:none;border:none;cursor:pointer;font-size:1.5rem;color:var(--ink);padding:.3rem}

@media(max-width:920px){
  .site-burger{display:block}
  .site-nav{
    position:fixed;inset:var(--header-h) 0 auto 0;flex-direction:column;align-items:stretch;
    gap:.2rem;background:var(--surface);border-bottom:1px solid var(--line);padding:1rem 1.6rem 1.6rem;
    box-shadow:var(--shadow-md);transform:translateY(-130%);transition:transform .25s ease;
  }
  .site-nav.is-open{transform:translateY(0)}
  .site-nav a{padding:.8rem .4rem;font-size:1rem;width:100%;border-bottom:1px solid var(--line-2)}
  .site-nav a.is-active{border-bottom-color:var(--gold)}
  .site-cta{margin:.8rem 0 0}
  .site-cta .btn{width:100%}
}

/* =====================================================================
   SHARED CARDS / GRID (used by some pages)
   ===================================================================== */
.mm-grid{display:grid;gap:1.1rem}
.mm-grid--3{grid-template-columns:repeat(3,1fr)}
.mm-grid--4{grid-template-columns:repeat(4,1fr)}
.mm-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:1.6rem 1.5rem;box-shadow:var(--shadow-sm);transition:transform .18s ease,box-shadow .18s ease,border-color .18s;height:100%;
}
.mm-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:var(--line)}
@media(max-width:900px){.mm-grid--4{grid-template-columns:repeat(2,1fr)}.mm-grid--3{grid-template-columns:1fr}}
@media(max-width:560px){.mm-grid--4{grid-template-columns:1fr}}

/* =====================================================================
   CONTACT FORM (modal fields — used across pages)
   ===================================================================== */
.mm-msg{display:none;padding:.8rem 1rem;border-radius:10px;font-size:.92rem;margin-top:1rem}
.mm-msg--ok{background:#ecfdf5;color:#065f46;border:1px solid #a7f3d0}
.mm-msg--err{background:#fef2f2;color:#991b1b;border:1px solid #fecaca}

/* =====================================================================
   FOOTER (shared) — ink anchor with gold accents
   ===================================================================== */
.site-footer{background:var(--ink);color:#b7ae9b;padding:3.5rem 0 2rem}
.site-footer__grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:2.5rem;margin-bottom:2.5rem}
.site-footer__brand .logo{font-family:var(--font-display);font-weight:600;font-size:1.3rem;color:#fff}
.site-footer__brand .logo span{color:var(--gold-soft)}
.site-footer__brand p{margin-top:.9rem;max-width:360px;font-size:.92rem;line-height:1.8}
.site-footer h4{color:#fff;font-family:var(--font-display);font-size:1rem;font-weight:600;margin-bottom:1rem}
.site-footer ul{list-style:none}
.site-footer li{margin-bottom:.6rem}
.site-footer a{font-size:.92rem;transition:color .15s}
.site-footer a:hover{color:var(--gold-soft)}
.site-footer__bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:1.6rem;display:flex;justify-content:space-between;align-items:center;gap:1rem;flex-wrap:wrap;font-size:.85rem}
.site-footer__bottom a:hover{color:var(--gold-soft)}
@media(max-width:760px){.site-footer__grid{grid-template-columns:1fr;gap:1.8rem}}

/* reveal-on-scroll (progressive; no-JS shows everything) */
.mm-reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.mm-reveal.is-in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  *{scroll-behavior:auto!important}
  .mm-reveal{opacity:1;transform:none;transition:none}
  .btn:hover,.mm-card:hover{transform:none}
}
:focus-visible{outline:3px solid rgba(169,130,31,.5);outline-offset:2px;border-radius:4px}