@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Sora:wght@600;700;800&display=swap');

:root{
  --bg:#F3FAFF;
  --bg-2:#E7F3FF;
  --bg-3:#DCEAFA;
  --primary:#1672ED;
  --primary-dark:#0E56BE;
  --primary-soft:#DCEBFF;
  --accent:#FFE76B;
  --accent-deep:#9A7B00;
  --ink:#15273A;
  --ink-soft:#41586F;
  --line:rgba(21,39,58,.14);
  --line-strong:rgba(21,39,58,.22);
  --card:#FFFFFF;
  --nav-bg:rgba(14,18,28,.88);
  --radius:16px;
  --radius-sm:10px;
  --maxw:1160px;
  --shadow:0 1px 2px rgba(21,39,58,.04), 0 10px 26px rgba(21,39,58,.06);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:'Inter',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  background:var(--bg);
  color:var(--ink);
  font-size:16px;
  line-height:1.62;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-family:'Sora','Inter',sans-serif;line-height:1.2;color:var(--ink);margin:0 0 .55em;font-weight:700}
h1{font-size:2rem}
h2{font-size:1.5rem}
h3{font-size:1.15rem}
p{margin:0 0 1em}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
ul,ol{margin:0 0 1em;padding-left:1.2em}
li{margin:.35em 0}
img{max-width:100%;display:block}
strong{font-weight:700}
hr{border:none;border-top:1px solid var(--line);margin:28px 0}

.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 32px}
.anchor{scroll-margin-top:84px}

.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* ---------- Navbar ---------- */
.site-nav{
  position:fixed;top:0;left:0;right:0;height:64px;z-index:200;
  background:var(--nav-bg);
  -webkit-backdrop-filter:blur(16px) saturate(140%);
  backdrop-filter:blur(16px) saturate(140%);
  border-bottom:1px solid rgba(255,255,255,.09);
}
.nav-inner{
  max-width:var(--maxw);margin:0 auto;height:100%;
  display:flex;align-items:center;gap:22px;padding:0 32px;
}
.nav-logo{
  display:flex;align-items:center;gap:10px;color:#fff;font-family:'Sora',sans-serif;
  font-weight:700;font-size:1.02rem;letter-spacing:.2px;white-space:nowrap;
}
.nav-logo:hover{text-decoration:none;opacity:.92}
.nav-logo .logo-mark{
  width:30px;height:30px;border-radius:9px;flex:0 0 auto;
  background:linear-gradient(140deg,var(--primary),#39A0FF);
  display:flex;align-items:center;justify-content:center;color:#fff;font-size:16px;
}
.nav-logo small{display:block;font-family:'Inter',sans-serif;font-weight:500;font-size:11px;color:rgba(255,255,255,.6);letter-spacing:.3px}
.nav-links{display:flex;align-items:center;gap:4px;margin-left:auto}
.nav-links > a,.nav-drop > summary{
  color:rgba(255,255,255,.86);font-weight:500;font-size:14.5px;padding:9px 13px;border-radius:9px;
  white-space:nowrap;cursor:pointer;transition:.16s;list-style:none;
}
.nav-links > a:hover,.nav-drop > summary:hover{background:rgba(255,255,255,.12);text-decoration:none;color:#fff}
.nav-links > a:focus-visible,.nav-drop > summary:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.nav-drop{position:relative}
.nav-drop > summary::-webkit-details-marker{display:none}
.nav-drop > summary{display:inline-flex;align-items:center;gap:7px}
.nav-drop[open] > summary{background:rgba(255,255,255,.14);color:#fff}
.nav-drop-menu{
  position:absolute;top:calc(100% + 10px);left:0;width:300px;background:#fff;border:1px solid var(--line);
  border-radius:14px;box-shadow:0 18px 44px rgba(14,25,40,.22);padding:8px;z-index:210;
}
.nav-drop-menu a{
  display:flex;align-items:center;gap:10px;padding:9px 11px;border-radius:9px;color:var(--ink);
  font-size:14px;font-weight:500;
}
.nav-drop-menu a:hover{background:var(--primary-soft);text-decoration:none;color:var(--primary-dark)}
.nav-drop-menu .ext{font-size:11px;color:var(--ink-soft);margin-left:auto}
.nav-cta{margin-left:10px;display:flex;gap:10px;align-items:center}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 22px;border-radius:var(--radius-sm);font-weight:600;font-size:15px;
  white-space:nowrap;cursor:pointer;border:1px solid transparent;transition:.18s;font-family:'Inter',sans-serif;
}
.btn:hover{text-decoration:none}
.btn i{font-size:17px}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark);color:#fff}
.btn-accent{background:var(--accent);color:#3A3000}
.btn-accent:hover{background:#FFF0A3;color:#3A3000}
.btn-ghost{background:rgba(255,255,255,.13);color:#fff;border-color:rgba(255,255,255,.3)}
.btn-ghost:hover{background:rgba(255,255,255,.22);color:#fff}
.btn-outline{background:#fff;color:var(--ink);border-color:var(--line-strong)}
.btn-outline:hover{border-color:var(--primary);color:var(--primary-dark);background:#fff}
.btn-sm{height:40px;padding:0 16px;font-size:14px}
.btn-block{width:100%}

/* ---------- Hero ---------- */
.hero{
  position:relative;margin-top:64px;min-height:344px;display:flex;align-items:center;
  background-size:cover;background-position:center;color:#fff;overflow:hidden;
}
.hero::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(9,17,30,.5) 0%,rgba(9,17,30,.66) 55%,rgba(9,17,30,.82) 100%);
}
.hero-inner{position:relative;z-index:2;width:100%;padding:52px 0}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.15);
  border:1px solid rgba(255,255,255,.28);color:#fff;border-radius:999px;
  padding:6px 14px;font-size:12.5px;font-weight:600;letter-spacing:.4px;text-transform:uppercase;margin-bottom:16px;
}
.eyebrow i{color:var(--accent)}
.hero h1{color:#fff;font-size:2.25rem;max-width:820px;margin-bottom:14px}
.hero p.lead{color:rgba(255,255,255,.9);font-size:1.05rem;max-width:680px;margin-bottom:22px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:12px}
.hero-note{font-size:13px;color:rgba(255,255,255,.75);display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.hero-note i{color:var(--accent)}

/* ---------- Sections ---------- */
.section{padding:44px 0}
.section.tint{background:var(--bg-2)}
.section.tint2{background:linear-gradient(180deg,var(--bg) 0%,var(--bg-2) 100%)}
.section-head{max-width:760px;margin-bottom:22px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.section-kicker{
  color:var(--primary-dark);font-weight:700;font-size:13px;letter-spacing:.8px;text-transform:uppercase;margin-bottom:8px;display:block;
}
.section-head p{color:var(--ink-soft);margin-bottom:0;font-size:15.5px}

/* ---------- Category grid ---------- */
.cat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.cat-card{
  display:flex;align-items:center;gap:13px;padding:15px 16px;background:var(--card);
  border:1px solid var(--line);border-radius:14px;min-height:66px;transition:.18s;color:var(--ink);
}
.cat-card:hover{text-decoration:none;border-color:var(--primary);transform:translateY(-2px);box-shadow:var(--shadow);color:var(--ink)}
.cat-card .cat-ico{
  width:38px;height:38px;border-radius:10px;background:var(--primary-soft);color:var(--primary-dark);
  display:flex;align-items:center;justify-content:center;font-size:19px;flex:0 0 auto;
}
.cat-card .cat-name{font-weight:600;font-size:14.5px;line-height:1.25}
.cat-card .cat-go{margin-left:auto;color:var(--ink-soft);font-size:16px}
.cat-card:hover .cat-go{color:var(--primary)}
.cat-card .badge-ext{display:block;font-size:11px;color:var(--ink-soft);font-weight:500}

/* ---------- Steps ---------- */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.step{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px}
.step .num{
  width:38px;height:38px;border-radius:11px;background:var(--accent);color:#3A3000;font-weight:800;
  display:flex;align-items:center;justify-content:center;font-family:'Sora',sans-serif;margin-bottom:14px;font-size:16px;
}
.step h3{font-size:1.05rem;margin-bottom:6px}
.step p{margin:0;color:var(--ink-soft);font-size:14.5px}

/* ---------- Articles ---------- */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-bottom:26px}
.article-card{
  display:flex;flex-direction:column;background:var(--card);border:1px solid var(--line);border-radius:16px;
  overflow:hidden;transition:.18s;color:var(--ink);height:100%;
}
.article-card:hover{text-decoration:none;transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--line-strong);color:var(--ink)}
.article-card .thumb{height:158px;width:100%;object-fit:cover;object-position:center}
.article-card .card-body{padding:16px 17px 18px;display:flex;flex-direction:column;flex:1}
.tag{
  display:inline-flex;align-items:center;gap:6px;align-self:flex-start;
  background:var(--primary-soft);color:var(--primary-dark);font-size:11.5px;font-weight:700;
  padding:4px 10px;border-radius:999px;margin-bottom:10px;letter-spacing:.3px;text-transform:uppercase;
}
.tag.alt{background:#FFF7CF;color:var(--accent-deep)}
.article-card h3{font-size:1.02rem;margin-bottom:8px}
.article-card p{color:var(--ink-soft);font-size:14px;margin:0 0 12px;flex:1}
.card-more{color:var(--primary-dark);font-weight:600;font-size:14px;display:inline-flex;align-items:center;gap:6px}

.guide-index{border-top:1px solid var(--line);margin-top:6px}
.guide-group{padding:20px 0;border-bottom:1px solid var(--line)}
.guide-group h3{font-size:1.02rem;display:flex;align-items:center;gap:9px;margin-bottom:12px}
.guide-group h3 i{color:var(--primary)}
.guide-list{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(2,1fr);gap:6px 18px}
.guide-list a{display:flex;gap:9px;align-items:baseline;color:var(--ink);font-size:14.5px;padding:5px 0}
.guide-list a:hover{color:var(--primary-dark)}
.guide-list .idx{font-family:'Sora',sans-serif;font-weight:700;color:var(--primary);font-size:12.5px;min-width:22px}

/* ---------- Tips ---------- */
.tips{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:26px 28px;max-width:900px}
.tips p:last-child{margin-bottom:0}
.tips ul{margin-bottom:0}

/* ---------- FAQ ---------- */
.faq{max-width:860px;margin:0 auto}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:14px;margin-bottom:10px;overflow:hidden}
.faq summary{
  cursor:pointer;padding:16px 20px;font-weight:600;font-size:15.5px;list-style:none;
  display:flex;align-items:center;gap:12px;color:var(--ink);
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"\ea4e";font-family:"remixicon";margin-left:auto;transition:.2s;color:var(--primary);font-size:19px}
.faq details[open] summary::after{transform:rotate(180deg)}
.faq details[open] summary{color:var(--primary-dark)}
.faq .faq-body{padding:0 20px 18px;color:var(--ink-soft);font-size:14.8px}
.faq .faq-body p:last-child{margin-bottom:0}

/* ---------- Footer ---------- */
.site-footer{background:var(--bg-2);border-top:1px solid var(--line);padding:44px 0 28px;margin-top:8px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:30px}
.footer-brand .nav-logo{color:var(--ink)}
.footer-brand .nav-logo small{color:var(--ink-soft)}
.footer-brand .logo-mark{background:linear-gradient(140deg,var(--primary),#39A0FF)}
.footer-brand p{color:var(--ink-soft);font-size:14px;margin-top:12px;max-width:340px}
.footer-col h4{font-size:13px;text-transform:uppercase;letter-spacing:.7px;color:var(--ink-soft);margin-bottom:12px}
.footer-col ul{list-style:none;padding:0;margin:0}
.footer-col a{color:var(--ink);font-size:14px;display:inline-block;padding:4px 0}
.footer-col a:hover{color:var(--primary-dark)}
.footer-bottom{border-top:1px solid var(--line);margin-top:30px;padding-top:18px;display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;align-items:center}
.footer-bottom p{color:var(--ink-soft);font-size:13px;margin:0}
.to-top{display:inline-flex;align-items:center;gap:7px;font-weight:600;font-size:14px}

/* ---------- Mobile bottom nav + sheet ---------- */
.mobile-bar{display:none}
#mobile-sheet{
  border:none;padding:0;width:100%;max-width:520px;margin:auto auto 0;
  border-radius:20px 20px 0 0;background:#fff;color:var(--ink);
  max-height:80dvh;
}
#mobile-sheet::backdrop{background:rgba(9,17,30,.55);-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}
#mobile-sheet .sheet-head{
  display:flex;align-items:center;justify-content:space-between;padding:16px 20px;
  border-bottom:1px solid var(--line);position:sticky;top:0;background:#fff;border-radius:20px 20px 0 0;z-index:2;
}
#mobile-sheet .sheet-head h2{margin:0;font-size:1.1rem}
.sheet-close{background:var(--bg);border:1px solid var(--line);width:38px;height:38px;border-radius:10px;font-size:19px;cursor:pointer;color:var(--ink);display:flex;align-items:center;justify-content:center}
.sheet-body{padding:16px 20px 30px;overflow-y:auto;max-height:calc(80dvh - 64px)}
.sheet-sec{margin-bottom:22px}
.sheet-sec h3{font-size:12.5px;text-transform:uppercase;letter-spacing:.7px;color:var(--ink-soft);margin-bottom:10px}
.sheet-cats{display:grid;grid-template-columns:repeat(2,1fr);gap:9px}
.sheet-cats a,.sheet-links a{
  display:flex;align-items:center;gap:9px;padding:10px 12px;border:1px solid var(--line);border-radius:11px;
  color:var(--ink);font-size:14px;font-weight:500;
}
.sheet-cats a:hover,.sheet-links a:hover{border-color:var(--primary);text-decoration:none;color:var(--primary-dark)}
.sheet-links a{margin-bottom:8px}
.sheet-cats i{color:var(--primary)}
html.sheet-open,html.sheet-open body{overflow:hidden}

/* ---------- Article page ---------- */
.article-hero{margin-top:64px;background:var(--bg-2);border-bottom:1px solid var(--line);padding:30px 0 34px}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--ink-soft);margin-bottom:16px}
.breadcrumb a{color:var(--ink-soft)}
.breadcrumb a:hover{color:var(--primary-dark)}
.breadcrumb i{font-size:14px}
.article-hero h1{font-size:2rem;max-width:900px;margin-bottom:12px}
.article-hero .article-lead{color:var(--ink-soft);font-size:1.02rem;max-width:820px;margin-bottom:16px}
.article-meta{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-size:13px;color:var(--ink-soft)}
.article-meta .chip{background:#fff;border:1px solid var(--line);border-radius:999px;padding:5px 13px;font-weight:600;color:var(--primary-dark)}
.article-wrap{padding:34px 0 10px;display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:40px;align-items:start}
.article-body{background:#fff;border:1px solid var(--line);border-radius:18px;padding:32px 34px}
.article-body h2{font-size:1.4rem;margin-top:34px;padding-top:6px}
.article-body h2:first-of-type{margin-top:6px}
.article-body h3{font-size:1.08rem;margin-top:22px}
.article-body figure{margin:22px 0}
.article-body figure img{border-radius:14px;border:1px solid var(--line);width:100%;height:auto}
.article-body figcaption{font-size:13px;color:var(--ink-soft);margin-top:9px;text-align:center}
.answer-box{
  background:var(--primary-soft);border-left:4px solid var(--primary);border-radius:12px;padding:18px 20px;margin:0 0 24px;
}
.answer-box strong{display:block;font-size:12.5px;text-transform:uppercase;letter-spacing:.6px;color:var(--primary-dark);margin-bottom:6px}
.answer-box p{margin:0;font-size:15.3px}
.callout{background:#FFFBE6;border:1px solid #F2E39B;border-radius:12px;padding:16px 18px;margin:22px 0}
.callout p{margin:0;font-size:14.6px}
.callout strong{color:#6B5A00}
.checklist{list-style:none;padding:0;margin:16px 0}
.checklist li{position:relative;padding-left:30px;margin:.5em 0}
.checklist li::before{content:"\ea5e";font-family:"remixicon";position:absolute;left:0;top:0;color:var(--primary);font-weight:700}
table.cmp{width:100%;border-collapse:collapse;margin:20px 0;font-size:14.3px;border:1px solid var(--line);border-radius:12px;overflow:hidden}
table.cmp th,table.cmp td{text-align:left;padding:11px 13px;border-bottom:1px solid var(--line)}
table.cmp thead th{background:var(--bg-2);font-family:'Sora',sans-serif;font-size:13.5px;color:var(--ink)}
table.cmp tbody tr:last-child td{border-bottom:none}
table.cmp tbody tr:nth-child(even){background:#FAFCFF}
.table-scroll{width:100%;overflow-x:auto}
.related-inline{background:var(--bg);border:1px dashed var(--line-strong);border-radius:12px;padding:15px 18px;margin:22px 0;font-size:14.5px}
.related-inline strong{color:var(--ink)}
.article-faq details{margin-bottom:10px}
.article-nav{display:flex;justify-content:space-between;gap:12px;margin:30px 0;flex-wrap:wrap}
.article-nav a{flex:1 1 240px;display:flex;flex-direction:column;gap:4px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:15px 17px;color:var(--ink)}
.article-nav a:hover{text-decoration:none;border-color:var(--primary);color:var(--primary-dark)}
.article-nav span{font-size:12px;color:var(--ink-soft);text-transform:uppercase;letter-spacing:.5px;font-weight:600}
.article-nav .dir{flex-direction:row;justify-content:flex-end;text-align:right}
.back-home{display:flex;justify-content:center;margin:6px 0 40px}

.aside-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px;margin-bottom:18px}
.aside-card h3{font-size:1rem;margin-bottom:12px}
.aside-card ul{list-style:none;padding:0;margin:0}
.aside-card li{margin:.5em 0}
.aside-card a{font-size:14.2px;display:flex;gap:8px;align-items:baseline;color:var(--ink)}
.aside-card a:hover{color:var(--primary-dark)}
.aside-card a i{color:var(--primary);font-size:13px}
.aside-cta{background:var(--ink);color:#fff;border-radius:16px;padding:20px;margin-bottom:18px}
.aside-cta h3{color:#fff;font-size:1rem}
.aside-cta p{color:rgba(255,255,255,.8);font-size:13.5px}
.aside-cta .btn{margin-top:6px}

/* ---------- Responsive ---------- */
@media (max-width:1024px){
  .cat-grid{grid-template-columns:repeat(3,1fr)}
  .article-wrap{grid-template-columns:1fr;gap:26px}
  .aside{display:grid;grid-template-columns:1fr 1fr;gap:18px}
  .aside-card,.aside-cta{margin-bottom:0}
}
@media (max-width:860px){
  .nav-links,.nav-cta{display:none}
  .nav-inner{justify-content:space-between}
  .hero{min-height:290px}
  .hero h1{font-size:1.7rem}
  .hero p.lead{font-size:.98rem}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .mobile-bar{
    display:flex;position:fixed;left:0;right:0;bottom:0;z-index:190;
    background:var(--nav-bg);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);
    border-top:1px solid rgba(255,255,255,.1);padding-bottom:env(safe-area-inset-bottom);
  }
  .mobile-bar a{
    flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;
    padding:9px 4px 8px;color:rgba(255,255,255,.72);font-size:11px;font-weight:500;cursor:pointer;
  }
  .mobile-bar a:hover,.mobile-bar a:active{text-decoration:none;color:#fff}
  .mobile-bar a i{font-size:21px}
  body{padding-bottom:66px}
  .article-body{padding:24px 20px}
  .article-hero h1{font-size:1.55rem}
  .container{padding:0 20px}
  .nav-inner{padding:0 20px}
  .section{padding:34px 0}
}
@media (max-width:640px){
  .cat-grid{grid-template-columns:repeat(2,1fr)}
  .guide-list{grid-template-columns:1fr}
  .feature-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .hero{min-height:270px;margin-top:64px}
  .hero-inner{padding:34px 0}
  .hero h1{font-size:1.45rem}
  .btn{padding:0 16px;font-size:14.5px}
  .hero-actions .btn{flex:1 1 auto}
  .aside{grid-template-columns:1fr}
  .tips{padding:20px}
  .section-head{margin-bottom:18px}
}
@media (prefers-reduced-motion:reduce){
  *{scroll-behavior:auto!important;transition:none!important}
}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px}