/* ============================================================
   HoloNails — shared design system (black / white / warm gray)
   ============================================================ */
:root{
  --ink:#111111;
  --body:#333333;
  --muted:#767676;
  --line:#ECECEC;
  --line-soft:#F4F3F1;
  --paper:#FFFFFF;
  --paper-soft:#FAF9F7;   /* warm gray */
  --paper-deep:#F4F3F1;
  --accent:#111111;       /* accent = black (monochrome) */

  --r-sm:8px;
  --r-md:12px;
  --r-lg:18px;
  --maxw:1200px;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  font-family:Inter,-apple-system,"Segoe UI","Helvetica Neue","PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--body);line-height:1.6;
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  font-size:16px;
}
img{display:block;max-width:100%}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
a{color:inherit;text-decoration:none}
::selection{background:#111;color:#fff}
:focus-visible{outline:2px solid #111;outline-offset:3px}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 clamp(20px,4vw,48px)}
@media(max-width:600px){.wrap{padding:0 16px}}

/* ---------- top nav ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.92);
  -webkit-backdrop-filter:saturate(160%) blur(12px);
  backdrop-filter:saturate(160%) blur(12px);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px;gap:24px}
.nav-brand{display:flex;align-items:center;gap:10px;font-weight:600;font-size:17px;letter-spacing:-.01em;color:var(--ink)}
.nav-brand .mark{
  width:30px;height:30px;border-radius:8px;background:var(--ink);color:#fff;
  display:grid;place-items:center;font-family:Georgia,serif;font-size:16px;font-weight:400;
}
.nav-brand small{color:var(--muted);font-weight:400;margin-left:2px}
.nav-links{display:flex;align-items:center;gap:28px;font-size:14px;color:var(--body)}
.nav-links a{color:var(--body);transition:color .15s}
.nav-links a:hover{color:var(--ink)}
.nav-links a.active{color:var(--ink);font-weight:600}
.nav-cta{
  background:var(--ink);color:#fff;font-size:13.5px;font-weight:500;
  padding:9px 18px;border-radius:999px;white-space:nowrap;
  transition:opacity .15s;
}
.nav-cta:hover{opacity:.85}
.nav-toggle{display:none;font-size:22px;color:var(--ink)}
@media(max-width:820px){
  .nav-links{
    display:none;position:absolute;left:0;right:0;top:64px;
    flex-direction:column;align-items:flex-start;gap:0;
    background:#fff;border-bottom:1px solid var(--line);padding:8px 20px 16px;
  }
  .nav-links.open{display:flex}
  .nav-links a{padding:12px 0;width:100%;border-bottom:1px solid var(--line-soft)}
  .nav-links a:last-child{border-bottom:none}
  .nav-toggle{display:block}
}

/* ---------- hero / page head ---------- */
.page-head{padding:64px 0 32px;border-bottom:1px solid var(--line)}
.page-head .eyebrow{
  font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--muted);
  margin-bottom:14px;
}
.page-head h1{
  font-size:clamp(32px,4.5vw,52px);line-height:1.05;letter-spacing:-.02em;
  color:var(--ink);font-weight:600;margin:0 0 18px;
}
.page-head p.lead{font-size:18px;color:var(--body);max-width:720px;margin:0}

/* ---------- content ---------- */
.section{padding:64px 0}
.section h2{font-size:28px;letter-spacing:-.01em;color:var(--ink);font-weight:600;margin:0 0 16px}
.section p{margin:0 0 16px;max-width:760px}
.section ul{padding-left:20px;max-width:760px}
.section ul li{margin-bottom:8px}

.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:32px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:32px;margin-top:32px}
@media(max-width:820px){.grid-3,.grid-2{grid-template-columns:1fr}}
.card{
  background:var(--paper-soft);border-radius:var(--r-md);padding:28px;
}
.card h3{font-size:18px;color:var(--ink);margin:0 0 10px;font-weight:600;letter-spacing:-.01em}
.card p{font-size:14.5px;color:var(--body);margin:0}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--ink);color:#fff;font-size:14.5px;font-weight:500;
  padding:13px 26px;border-radius:999px;
  transition:opacity .15s,transform .15s var(--ease);
}
.btn:hover{opacity:.88;transform:translateY(-1px)}
.btn-ghost{
  background:transparent;color:var(--ink);border:1px solid var(--ink);
}
.btn-ghost:hover{background:var(--ink);color:#fff;opacity:1}

/* ---------- FAQ ---------- */
.faq-item{border-bottom:1px solid var(--line);padding:20px 0}
.faq-item h3{font-size:17px;color:var(--ink);font-weight:600;margin:0 0 8px}
.faq-item p{margin:0;color:var(--body);font-size:15px}

/* ---------- footer ---------- */
.site-footer{
  background:var(--paper-soft);border-top:1px solid var(--line);
  margin-top:80px;padding:48px 0 32px;
  font-size:13.5px;color:var(--muted);
}
.site-footer .row{
  display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;
}
@media(max-width:820px){.site-footer .row{grid-template-columns:1fr 1fr}}
.site-footer h4{font-size:13px;color:var(--ink);margin:0 0 12px;letter-spacing:.05em;text-transform:uppercase;font-weight:600}
.site-footer a{display:block;padding:4px 0;color:var(--muted)}
.site-footer a:hover{color:var(--ink)}
.site-footer .copy{margin-top:32px;padding-top:20px;border-top:1px solid var(--line);display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

/* ---------- blog ---------- */
.blog-list{display:grid;grid-template-columns:repeat(2,1fr);gap:32px;margin-top:32px}
@media(max-width:720px){.blog-list{grid-template-columns:1fr}}
.blog-card{padding-bottom:16px;border-bottom:1px solid var(--line)}
.blog-card .meta{font-size:12px;color:var(--muted);letter-spacing:.08em;text-transform:uppercase;margin-bottom:10px}
.blog-card h3{font-size:22px;color:var(--ink);margin:0 0 10px;letter-spacing:-.01em;line-height:1.25}
.blog-card p{font-size:15px;color:var(--body);margin:0}
.blog-card a.readmore{display:inline-block;margin-top:14px;font-size:13.5px;font-weight:500;color:var(--ink);border-bottom:1px solid var(--ink);padding-bottom:2px}

.article{max-width:760px;margin:0 auto;padding:48px 0}
.article h1{font-size:clamp(28px,4vw,42px);line-height:1.1;letter-spacing:-.02em;color:var(--ink);margin:0 0 16px;font-weight:600}
.article .meta{font-size:13px;color:var(--muted);margin-bottom:32px;letter-spacing:.05em}
.article h2{font-size:24px;color:var(--ink);margin:36px 0 12px;font-weight:600;letter-spacing:-.01em}
.article p{font-size:16.5px;line-height:1.75;margin:0 0 18px;color:#222}
.article ul{font-size:16.5px;line-height:1.75;color:#222}
.article strong{color:var(--ink)}