*{box-sizing:border-box;margin:0;padding:0}
:root{
  --brand:#E84646;--brand-dark:#C03030;--brand-light:#FFF5F5;
  --navy:#111827;--navy2:#1F2937;
  --surf:#fff;--surf2:#F9FAFB;--surf3:#F3F4F6;
  --bdr:#E5E7EB;--bdr2:#D1D5DB;
  --t1:#111827;--t2:#374151;--t3:#6B7280;--t4:#9CA3AF;
  --green:#059669;--green-bg:#F0FAF6;--green-bdr:#D1FAE5;
  --r-md:10px;--r-lg:14px;--r-xl:18px;
  --shadow-sm:0 1px 3px rgba(0,0,0,.06);
}
html{font-size:16px;scroll-behavior:smooth}
body{font-family:'DM Sans',sans-serif;background:var(--surf3);color:var(--t1);min-height:100vh;display:flex;flex-direction:column}

/* NAV */
.nav{background:var(--surf);border-bottom:1px solid var(--bdr);position:sticky;top:0;z-index:200;box-shadow:var(--shadow-sm)}
.nav-inner{max-width:1100px;margin:0 auto;padding:0 1.5rem;height:60px;display:flex;align-items:center;justify-content:space-between}
.logo{font-size:20px;font-weight:700;color:var(--t1);text-decoration:none;letter-spacing:-.4px}
.logo span{color:var(--brand)}
.nav-back{display:flex;align-items:center;gap:5px;font-size:13px;color:var(--t3);text-decoration:none}
.nav-back:hover{color:var(--brand)}
.nav-back i{font-size:16px}

/* HERO */
.hero{background:linear-gradient(120deg,var(--navy) 0%,var(--navy2) 55%,#1e3a5f 100%);padding:2.5rem 1.5rem}
.hero-inner{max-width:1100px;margin:0 auto}
.hero-tag{font-size:11px;font-weight:700;color:rgba(255,255,255,.4);text-transform:uppercase;letter-spacing:.8px;margin-bottom:.6rem}
.hero-title{font-size:26px;font-weight:700;color:#fff;letter-spacing:-.3px;margin-bottom:.5rem}
.hero-meta{display:flex;align-items:center;gap:14px;flex-wrap:wrap;font-size:12px;color:rgba(255,255,255,.45)}
.hero-meta span{display:flex;align-items:center;gap:4px}
.hero-meta i{font-size:12px}

/* LAYOUT */
.page-wrap{max-width:1100px;margin:0 auto;padding:2rem 1.5rem 4rem;display:grid;grid-template-columns:220px 1fr;gap:2rem;align-items:start}

/* TOC */
.toc{position:sticky;top:76px;background:var(--surf);border:1px solid var(--bdr);border-radius:var(--r-xl);padding:1.1rem;box-shadow:var(--shadow-sm)}
.toc-title{font-size:10px;font-weight:700;color:var(--t4);text-transform:uppercase;letter-spacing:.7px;margin-bottom:.75rem}
.toc-link{display:block;font-size:12.5px;color:var(--t3);text-decoration:none;padding:5px 8px;border-radius:var(--r-md);transition:all .15s;line-height:1.4;margin-bottom:1px}
.toc-link:hover{background:var(--brand-light);color:var(--brand);font-weight:500}

/* DOC */
.doc{display:flex;flex-direction:column;gap:1.25rem}

.notice-box{display:flex;align-items:flex-start;gap:9px;padding:.85rem 1rem;background:#FEFCE8;border:1px solid #FEF08A;border-radius:var(--r-md);font-size:12.5px;color:#713F12;line-height:1.65}
.notice-box i{font-size:15px;color:#CA8A04;flex-shrink:0;margin-top:1px}

.meta-bar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;font-size:12px;color:var(--t3)}
.meta-bar span{display:flex;align-items:center;gap:4px;padding:4px 10px;background:var(--surf);border:1px solid var(--bdr);border-radius:20px}
.meta-bar i{font-size:12px}

/* Section */
.sec{background:var(--surf);border:1px solid var(--bdr);border-radius:var(--r-xl);overflow:hidden;box-shadow:var(--shadow-sm)}
.sec-hd{padding:1rem 1.4rem;background:var(--surf2);border-bottom:1px solid var(--bdr);display:flex;align-items:center;gap:9px}
.sec-num{width:24px;height:24px;border-radius:50%;background:var(--brand);color:#fff;font-size:10px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.sec-title{font-size:14px;font-weight:700;color:var(--t1)}
.sec-body{padding:1.25rem 1.4rem;display:flex;flex-direction:column;gap:.85rem}

/* Typography inside sections */
.sec-body p{font-size:13.5px;color:var(--t2);line-height:1.8;margin:0px;}
.sec-body ul,.sec-body ol{padding-left:1.25rem;display:flex;flex-direction:column;gap:.35rem}
.sec-body li{font-size:13.5px;color:var(--t2);line-height:1.7}
.sec-body li::marker{color:var(--brand)}
.sec-body strong{color:var(--t1);font-weight:600}
.sub-title{font-size:13px;font-weight:700;color:var(--t1);margin-top:.25rem;padding-bottom:.35rem;border-bottom:1px solid var(--bdr)}

/* Definition table */
.def-table{width:100%;border-collapse:collapse;font-size:13px}
.def-table th{font-size:10px;font-weight:700;color:var(--t4);text-transform:uppercase;letter-spacing:.5px;padding:8px 12px;text-align:left;background:var(--surf2);border-bottom:1px solid var(--bdr)}
.def-table td{padding:10px 12px;border-bottom:1px solid var(--surf3);color:var(--t2);vertical-align:top;line-height:1.6}
.def-table td:first-child{font-weight:600;color:var(--t1);white-space:nowrap;width:160px}
.def-table tr:last-child td{border-bottom:none}

/* Info callout */
.callout{display:flex;align-items:flex-start;gap:8px;padding:.75rem 1rem;border-radius:var(--r-md);font-size:12.5px;line-height:1.65}
.callout.green{background:var(--green-bg);border:1px solid var(--green-bdr);color:#065f46}
.callout.green i{color:var(--green);font-size:15px;flex-shrink:0;margin-top:1px}
.callout.red{background:var(--brand-light);border:1px solid #FECACA;color:#7f1d1d}
.callout.red i{color:var(--brand);font-size:15px;flex-shrink:0;margin-top:1px}

/* FOOTER */
footer{background:var(--navy);margin-top:auto}
.ft{max-width:1100px;margin:0 auto;padding:1.25rem 1.5rem;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:.75rem}
.ft-copy{font-size:12px;color:#6B7280}
.ft-links{display:flex;gap:1.25rem}
.ft-links a{font-size:12px;color:#6B7280;text-decoration:none}
.ft-links a:hover{color:#fff}

/* RESPONSIVE */
@media(max-width:780px){
  .page-wrap{grid-template-columns:1fr;padding:1.25rem 1rem 3rem}
  .toc{position:static;display:none}
  .hero{padding:1.75rem 1rem}
  .hero-title{font-size:21px}
  .sec-body{padding:1rem}
  .sec-hd{padding:.85rem 1rem}
  .def-table{display:block;overflow-x:auto}
.callout{display:flex;align-items:flex-start;gap:8px;padding:.75rem 1rem;border-radius:var(--r-md);font-size:12.5px;line-height:1.65;flex-direction: column;}
}