:root{
  --yellow:#F9C000; --yellow-soft:#FFF6D6; --navy:#121A23; --navy-2:#1B2633;
  --text:#1E2630; --muted:#5B6673; --line:#E6E9ED; --bg:#FFFFFF; --bg-2:#F6F7F9;
  --radius:12px; --side:270px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--text);background:var(--bg);line-height:1.65;font-size:16px}
a{color:#9A6F00;text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}

/* Top bar */
.topbar{position:sticky;top:0;z-index:50;background:var(--navy);color:#fff;display:flex;align-items:center;gap:16px;padding:10px 20px;height:60px}
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:18px}
.brand:hover{text-decoration:none}
.brand img{width:34px;height:34px;border-radius:9px}
.brand span b{color:var(--yellow)}
.brand small{font-weight:500;color:#AFC0D0;margin-left:4px;font-size:14px}
.top-search{flex:1;max-width:460px;margin-left:auto;position:relative}
.top-search input{width:100%;padding:9px 14px 9px 36px;border-radius:8px;border:1px solid #2C3A4A;background:var(--navy-2);color:#fff;font-size:14px}
.top-search input::placeholder{color:#8EA0B2}
.top-search svg{position:absolute;left:11px;top:50%;transform:translateY(-50%);opacity:.6}
.top-links{display:flex;gap:14px;align-items:center}
.top-links a{color:#DCE5EE;font-size:14px}
.btn{display:inline-block;background:var(--yellow);color:var(--navy)!important;font-weight:600;padding:8px 14px;border-radius:8px;font-size:14px}
.btn:hover{text-decoration:none;filter:brightness(.95)}
.menu-btn{display:none;background:none;border:0;color:#fff;font-size:24px;cursor:pointer;padding:0 4px}

/* Search results */
.results{position:absolute;top:44px;left:0;right:0;background:#fff;border-radius:10px;box-shadow:0 12px 32px rgba(0,0,0,.18);max-height:60vh;overflow:auto;display:none}
.results.show{display:block}
.results a{display:block;padding:10px 14px;border-bottom:1px solid var(--line);color:var(--text)}
.results a:hover,.results a.active{background:var(--yellow-soft);text-decoration:none}
.results a small{display:block;color:var(--muted);font-size:12px}
.results .none{padding:12px 14px;color:var(--muted);font-size:14px}

/* Layout */
.layout{display:flex;min-height:calc(100vh - 60px)}
.sidebar{width:var(--side);flex-shrink:0;border-right:1px solid var(--line);background:var(--bg-2);padding:20px 12px 40px;position:sticky;top:60px;height:calc(100vh - 60px);overflow:auto}
.sidebar h4{font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin:18px 10px 6px}
.sidebar h4:first-child{margin-top:0}
.sidebar a{display:block;padding:6px 10px;border-radius:7px;color:var(--text);font-size:14.5px}
.sidebar a:hover{background:#ECEEF1;text-decoration:none}
.sidebar a.current{background:var(--yellow-soft);font-weight:600;border-left:3px solid var(--yellow)}
.sidebar .sub a{padding-left:22px;font-size:13.5px;color:var(--muted)}
main{flex:1;min-width:0;padding:36px 48px 60px;max-width:900px}
.toc{width:220px;flex-shrink:0;padding:36px 16px;position:sticky;top:60px;height:calc(100vh - 60px);overflow:auto;font-size:13.5px}
.toc b{display:block;font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin-bottom:8px}
.toc a{display:block;color:var(--muted);padding:3px 0}
.toc a:hover{color:var(--text)}

/* Content */
.crumb{font-size:13px;color:var(--muted);margin-bottom:6px}
.crumb a{color:var(--muted)}
main h1{font-size:32px;line-height:1.25;margin:0 0 8px;color:var(--navy)}
.lead{font-size:18px;color:var(--muted);margin:0 0 28px}
main h2{font-size:23px;margin:42px 0 12px;padding-top:12px;border-top:1px solid var(--line);color:var(--navy);scroll-margin-top:76px}
main h3{font-size:18px;margin:26px 0 8px;scroll-margin-top:76px}
main p,main li{color:#2C3540}
main ul,main ol{padding-left:22px}
main li{margin:4px 0}
code{background:var(--bg-2);border:1px solid var(--line);padding:1px 6px;border-radius:5px;font-size:.92em}
.ui{background:var(--navy);color:#fff;padding:1px 8px;border-radius:5px;font-size:.88em;font-weight:500;white-space:nowrap}
.note,.tip,.warn{border-radius:var(--radius);padding:14px 16px;margin:18px 0;border-left:4px solid}
.note{background:#EEF4FB;border-color:#4A7DB8}
.tip{background:var(--yellow-soft);border-color:var(--yellow)}
.warn{background:#FDEEEE;border-color:#D64545}
.note b,.tip b,.warn b{display:block;margin-bottom:2px}
.shots{display:flex;gap:18px;flex-wrap:wrap;margin:18px 0}
.shot{margin:0;width:220px}
.shot img{width:100%;border-radius:16px;border:6px solid var(--navy);box-shadow:0 6px 18px rgba(0,0,0,.12)}
.shot figcaption{font-size:13px;color:var(--muted);text-align:center;margin-top:6px}
table{border-collapse:collapse;width:100%;margin:16px 0;font-size:15px}
th,td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
th{background:var(--bg-2)}
.steps{counter-reset:s;list-style:none;padding:0}
.steps>li{counter-increment:s;position:relative;padding-left:44px;margin:14px 0}
.steps>li::before{content:counter(s);position:absolute;left:0;top:0;width:30px;height:30px;border-radius:50%;background:var(--yellow);color:var(--navy);font-weight:700;display:flex;align-items:center;justify-content:center;font-size:14px}
details{border:1px solid var(--line);border-radius:10px;padding:12px 16px;margin:10px 0;background:#fff}
details summary{cursor:pointer;font-weight:600}
details[open] summary{margin-bottom:6px}
.pager{display:flex;justify-content:space-between;gap:12px;margin-top:48px;padding-top:20px;border-top:1px solid var(--line)}
.pager a{border:1px solid var(--line);border-radius:10px;padding:12px 16px;flex:1;color:var(--text)}
.pager a:hover{border-color:var(--yellow);text-decoration:none}
.pager small{display:block;color:var(--muted);font-size:12px}
.pager .next{text-align:right}
.help-box{margin-top:40px;background:var(--navy);color:#fff;border-radius:var(--radius);padding:20px 22px;display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between}
.help-box p{color:#C9D5E1;margin:4px 0 0}

/* Home */
.hero{background:var(--navy);color:#fff;padding:56px 20px 64px;text-align:center}
.hero h1{font-size:38px;margin:0 0 10px;color:#fff}
.hero h1 b{color:var(--yellow)}
.hero p{color:#C9D5E1;margin:0 0 26px;font-size:18px}
.hero .big-search{max-width:620px;margin:0 auto;position:relative}
.hero .big-search input{width:100%;padding:16px 18px 16px 46px;border-radius:12px;border:0;font-size:16px}
.hero .big-search svg{color:#5B6673;position:absolute;left:16px;top:50%;transform:translateY(-50%)}
.hero .big-search .results{top:58px;text-align:left}
.home{max-width:1100px;margin:0 auto;padding:40px 20px 60px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:18px}
.card{border:1px solid var(--line);border-radius:var(--radius);padding:20px;color:var(--text);background:#fff;transition:.15s}
.card:hover{border-color:var(--yellow);box-shadow:0 8px 22px rgba(0,0,0,.07);text-decoration:none;transform:translateY(-2px)}
.card .ico{width:42px;height:42px;border-radius:10px;background:var(--yellow-soft);display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:10px}
.card h3{margin:0 0 4px;font-size:17px;color:var(--navy)}
.card p{margin:0;color:var(--muted);font-size:14.5px}
.home h2{color:var(--navy);margin:44px 0 14px;font-size:22px}
.popular{columns:2;column-gap:32px;padding-left:18px}
.popular li{margin:6px 0;break-inside:avoid}
footer{border-top:1px solid var(--line);padding:22px 20px;text-align:center;color:var(--muted);font-size:13.5px;background:var(--bg-2)}

@media (max-width:1180px){.toc{display:none}}
@media (max-width:860px){
  .menu-btn{display:block}
  .top-links a:not(.btn){display:none}
  .top-search{display:none}
  .sidebar{position:fixed;left:0;top:60px;z-index:40;transform:translateX(-100%);transition:transform .2s;background:#fff;visibility:hidden}
  .sidebar.open{transform:none;visibility:visible;box-shadow:4px 0 24px rgba(0,0,0,.15)}
  main{padding:24px 16px 48px}
  main h1{font-size:26px}
  .shot{width:calc(50% - 9px)}
  .hero h1{font-size:28px}
  .popular{columns:1}
  .pager{flex-direction:column}
}

.video{margin:16px 0;width:280px;max-width:100%}
.video video{display:block;width:100%;height:auto;max-height:560px;border-radius:16px;border:5px solid var(--navy);background:#000;box-shadow:0 6px 18px rgba(0,0,0,.12)}