:root{
  --bg:#f5f7fb;--surface:#fff;--surface2:#f8fafc;--ink:#0f172a;--muted:#64748b;--line:#dbe4f0;
  --blue:#2563eb;--blue2:#1d4ed8;--green:#15803d;--orange:#f97316;--red:#dc2626;--purple:#9333ea;
  --white:#fff;--slate-50:#f8fafc;--slate-100:#f1f5f9;--slate-200:#e2e8f0;--slate-300:#cbd5e1;--slate-500:#64748b;--slate-600:#475569;--slate-700:#334155;--slate-900:#0f172a;
  --blue-50:#eff6ff;--blue-100:#dbeafe;--blue-200:#bfdbfe;--blue-400:#60a5fa;--blue-800:#1e40af;--blue-900:#1e3a8a;
  --green-50:#f0fdf4;--green-100:#dcfce7;--green-800:#166534;--orange-50:#fff7ed;--orange-100:#ffedd5;--orange-200:#fed7aa;--orange-800:#9a3412;--red-50:#fff1f2;--red-100:#fee2e2;--red-200:#fecaca;--red-800:#991b1b;--gray-100:#e5e7eb;--gray-700:#374151;
  --focus-ring:#60a5fa;
  --shadow:0 22px 60px rgba(15,23,42,.10);--soft-shadow:0 12px 32px rgba(15,23,42,.07);
  --radius:22px;--radius2:14px;--nav:#0f172a;
}
*{box-sizing:border-box} html{scroll-behavior:smooth} body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;line-height:1.55} a{color:inherit;text-decoration:none} code{font-family:Consolas,"SFMono-Regular",monospace;background:#eef2ff;color:var(--blue-900);border-radius:6px;padding:.12rem .38rem}.layout{display:grid;grid-template-columns:310px minmax(0,1fr);min-height:100vh}.sidebar{position:sticky;top:0;height:100vh;background:linear-gradient(180deg,var(--slate-900),#111827);color:var(--gray-100);padding:22px 18px;display:flex;flex-direction:column;border-right:1px solid rgba(255,255,255,.08)}.brand{display:flex;gap:12px;align-items:center;padding:4px 6px 18px;border-bottom:1px solid rgba(255,255,255,.08)}.mark{width:44px;height:44px;border-radius:13px;background:#1556b3;display:grid;place-items:center;font-weight:900;color:var(--white)}.brand strong{display:block;font-size:18px}.brand span{font-size:12px;color:#9ca3af}.search{padding:16px 6px 8px}.search input{width:100%;border:1px solid rgba(255,255,255,.12);background:rgba(255,255,255,.06);color:var(--white);border-radius:12px;padding:12px 14px;outline:none}.search input::placeholder{color:#94a3b8}.nav{display:flex;flex-direction:column;gap:5px;overflow:auto;padding:0 6px 16px}.nav a{display:flex;gap:10px;align-items:center;padding:11px 12px;border-radius:12px;color:var(--slate-300);font-size:14px;font-weight:650}.nav a span{font-size:11px;color:#93c5fd;background:rgba(37,99,235,.18);border:1px solid rgba(147,197,253,.13);border-radius:999px;padding:2px 6px}.nav a.active,.nav a:hover{background:rgba(37,99,235,.18);color:var(--white)}.nav a.active{box-shadow:inset 3px 0 0 var(--blue-400)}.nav a[hidden]{display:none}.side-footer{margin-top:auto;border:1px solid rgba(255,255,255,.08);background:rgba(255,255,255,.04);border-radius:16px;padding:15px 12px;color:#9ca3af;font-size:12px}.side-footer b{display:block;color:var(--white);font-size:14px}.content{min-width:0}.topbar{position:sticky;top:0;z-index:30;height:68px;background:rgba(245,247,251,.88);backdrop-filter:blur(16px);border-bottom:1px solid var(--line);display:flex;align-items:center;gap:14px;padding:0 38px}.menu{display:none;background:var(--white);border:1px solid var(--line);border-radius:12px;padding:9px 12px}.topbar strong{display:block}.topbar span{display:block;font-size:12px;color:var(--muted)}.top-actions{margin-left:auto;display:flex;gap:10px;align-items:center}.pill{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:var(--white);border-radius:999px;padding:8px 13px;font-size:13px;font-weight:800;color:var(--slate-700);box-shadow:0 8px 22px rgba(15,23,42,.04)}.section{max-width:1360px;margin:0 auto;padding:46px 38px;scroll-margin-top:86px}.hero{display:grid;grid-template-columns:1.35fr .65fr;gap:24px;min-height:calc(100vh - 68px);align-items:stretch}.panel,.card,.screen,.steps,.chapter-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.hero .panel{padding:54px;display:flex;flex-direction:column;justify-content:center;background:radial-gradient(circle at 15% 0%,rgba(37,99,235,.12),transparent 32%),linear-gradient(135deg,var(--white),#f8fbff)}.eyebrow{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--blue);font-weight:900;margin-bottom:10px}h1,h2,h3,h4,p{margin-top:0}h1{font-size:clamp(38px,5vw,66px);line-height:.98;letter-spacing:-.055em;margin-bottom:20px}h2{font-size:clamp(30px,3vw,44px);line-height:1.05;letter-spacing:-.04em;margin-bottom:10px}h3{font-size:22px;letter-spacing:-.02em;margin-bottom:9px}h4{font-size:16px;margin-bottom:6px}p{color:var(--muted)}.hero p{font-size:18px}.buttons{display:flex;gap:12px;flex-wrap:wrap;margin-top:14px}.btn{border:1px solid var(--line);background:var(--white);border-radius:14px;padding:11px 16px;font-weight:850;cursor:pointer}.btn.primary{background:var(--blue);border-color:var(--blue);color:var(--white)}.btn.primary:hover{background:var(--blue2)}.hero-card{padding:28px}.stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.stat{background:var(--slate-100);border:1px solid var(--line);border-radius:18px;padding:18px}.stat b{display:block;font-size:34px;letter-spacing:-.04em}.stat span{color:var(--muted);font-size:13px}.notice{margin-top:16px;border:1px solid var(--blue-200);background:var(--blue-50);border-radius:16px;padding:15px 16px}.notice b{display:block;color:var(--blue-900)}.notice p{margin:4px 0 0;color:var(--slate-700)}.notice.warn{border-color:var(--orange-200);background:var(--orange-50)}.notice.warn b{color:var(--orange-800)}.notice.danger{border-color:var(--red-200);background:var(--red-50)}.notice.danger b{color:var(--red-800)}.section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:18px;margin-bottom:22px}.section-head p{max-width:860px}.grid{display:grid;gap:18px}.two{grid-template-columns:repeat(2,minmax(0,1fr))}.three{grid-template-columns:repeat(3,minmax(0,1fr))}.four{grid-template-columns:repeat(4,minmax(0,1fr))}.card{padding:24px;box-shadow:var(--soft-shadow)}.card ul,.card ol{padding-left:20px;margin:10px 0 0;color:var(--slate-700)}.card li+li{margin-top:7px}.check{list-style:none;padding-left:0!important}.check li{position:relative;padding-left:28px}.check li:before{content:"✓";position:absolute;left:0;top:0;width:18px;height:18px;border-radius:50%;display:grid;place-items:center;background:var(--green-100);color:#15803d;font-weight:900;font-size:12px}.screen{margin-top:20px;overflow:hidden}.screen-head{display:flex;justify-content:space-between;gap:14px;align-items:center;padding:18px 22px;border-bottom:1px solid var(--line);background:var(--white)}.screen-head p{margin:0}.zoom{border:1px solid var(--blue-200);background:var(--blue-50);color:#1d4ed8;border-radius:12px;padding:9px 12px;font-weight:850;cursor:pointer;white-space:nowrap}.shot{position:relative;background:var(--slate-200);padding:14px}.shot img{display:block;width:100%;height:auto;border-radius:14px;border:1px solid var(--slate-300);background:var(--white)}.caption{padding:12px 22px;color:var(--slate-600);font-size:14px;background:var(--white)}.legend{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;padding:16px 22px;border-top:1px solid var(--line);background:var(--slate-50)}.legend div{display:flex;gap:9px;align-items:flex-start;color:var(--slate-600);font-size:13px}.legend b{flex:none;background:var(--blue-100);color:#1d4ed8;border-radius:999px;width:24px;height:24px;display:grid;place-items:center}.hot{position:absolute;transform:translate(-50%,-50%);width:28px;height:28px;border-radius:999px;background:var(--blue);color:var(--white);display:grid;place-items:center;font-size:13px;font-weight:900;box-shadow:0 8px 18px rgba(37,99,235,.3);border:2px solid var(--white)}.steps{padding:24px;margin-top:18px}.step-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.step{background:var(--slate-50);border:1px solid var(--line);border-radius:16px;padding:16px}.step b{display:grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--blue-100);color:#1d4ed8;margin-bottom:10px}.mini-table{width:100%;border-collapse:collapse;margin-top:12px;font-size:14px}.mini-table th,.mini-table td{border:1px solid var(--line);padding:10px;text-align:left}.mini-table th{background:var(--slate-100)}.flow{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-top:10px}.flow span{background:var(--slate-100);border:1px solid var(--line);border-radius:999px;padding:8px 11px;color:var(--slate-700);font-weight:750;font-size:13px}.flow b{color:#94a3b8}.badge-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}.badge{display:inline-flex;border-radius:999px;padding:5px 9px;font-size:12px;font-weight:900}.b-green{background:var(--green-100);color:var(--green-800)}.b-orange{background:var(--orange-100);color:var(--orange-800)}.b-blue{background:var(--blue-100);color:var(--blue-800)}.b-red{background:var(--red-100);color:var(--red-800)}.b-gray{background:var(--gray-100);color:var(--gray-700)}.callout{border-left:4px solid var(--blue);background:var(--blue-50);padding:15px 16px;border-radius:14px;margin:16px 0}.callout.orange{border-left-color:var(--orange);background:var(--orange-50)}.callout.red{border-left-color:var(--red);background:var(--red-50)}.callout.green{border-left-color:var(--green);background:var(--green-50)}.image-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-top:18px}.image-tile{background:var(--white);border:1px solid var(--line);border-radius:18px;box-shadow:var(--soft-shadow);overflow:hidden}.image-tile img{width:100%;display:block;border-bottom:1px solid var(--line)}.image-tile div{padding:13px 15px}.image-tile h4{margin-bottom:3px}.footer{max-width:1360px;margin:0 auto;padding:30px 38px 60px;color:var(--muted)}.modal{position:fixed;inset:0;z-index:100;background:rgba(15,23,42,.82);display:grid;place-items:center;padding:30px}.modal[hidden]{display:none}.modal-inner{position:relative;width:min(96vw,1500px);height:min(92vh,950px);background:#0b1220;border-radius:20px;box-shadow:0 30px 90px rgba(0,0,0,.45);padding:54px 18px 18px}.modal img{display:block;width:100%;height:100%;object-fit:contain}.close{position:absolute;right:16px;top:14px;border:0;background:var(--white);color:var(--slate-900);border-radius:999px;width:34px;height:34px;font-size:22px;cursor:pointer}.print-note{font-size:12px;color:var(--slate-500);margin-top:8px}@media (max-width:1100px){.layout{grid-template-columns:1fr}.sidebar{position:fixed;left:-320px;z-index:60;width:310px;transition:left .2s ease}.sidebar.open{left:0}.menu{display:inline-flex}.topbar{padding:0 18px}.hero,.two,.three,.four,.image-grid,.legend{grid-template-columns:1fr}.step-grid{grid-template-columns:1fr 1fr}.section{padding:34px 18px}.hero{min-height:auto}.hero .panel{padding:34px}.section-head{display:block}.top-actions{display:none}}@media(max-width:640px){.step-grid{grid-template-columns:1fr}.screen-head{display:block}.zoom{margin-top:12px}.modal{padding:12px}.modal-inner{height:90vh;padding:50px 10px 10px}.hot{display:none}}


/* Accessibility and platform polish */
:where(a,button,input,select,textarea,[tabindex]):focus-visible{outline:3px solid var(--focus-ring);outline-offset:3px}
::selection{background:var(--blue-100);color:var(--blue-900)}
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:var(--line);border-radius:999px}
::-webkit-scrollbar-thumb:hover{background:var(--muted)}
@supports (scrollbar-color:auto){*{scrollbar-width:thin;scrollbar-color:var(--line) var(--bg)}}