:root{
  --bg: #f7fbff;
  --rail: #0f2b46;
  --railText: #e6f1ff;
  --railMuted: rgba(230,241,255,.72);
  --paper: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --border: #d8e6f6;
  --accent: #2b6cb0;
  --shadow: 0 18px 46px rgba(0,0,0,.10);
}

*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;background:var(--bg);color:var(--text);font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", sans-serif;}
a{color:inherit}

.app{min-height:100vh;display:grid;grid-template-columns: 280px 1fr}

#rail{background:linear-gradient(180deg, #0f2b46, #163a5e);color:var(--railText);position:sticky;top:0;height:100vh;overflow:auto}
.rail-inner{padding:18px 16px}
#logo a{text-decoration:none;font-weight:800;letter-spacing:.4px;display:inline-block;padding:10px 12px;border-radius:12px;background:rgba(255,255,255,.08)}
.tagline{margin:14px 4px 10px 4px;color:var(--railMuted);font-size:.95rem}

.rail-nav{list-style:none;padding:0;margin:14px 0 0 0;display:flex;flex-direction:column;gap:6px}
.rail-nav a{text-decoration:none;display:block;padding:10px 12px;border-radius:12px;border:1px solid rgba(255,255,255,.12)}
.rail-nav li.active a{background:rgba(255,255,255,.14);border-color:rgba(255,255,255,.26)}

.rail-ads{margin-top:16px;padding-top:14px;border-top:1px dashed rgba(255,255,255,.22)}

.maincol{display:flex;flex-direction:column;min-width:0}
#mainhead{position:sticky;top:0;z-index:3;background:rgba(247,251,255,.86);backdrop-filter: blur(10px) saturate(1.1);border-bottom:1px solid var(--border)}
.mainhead-inner{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 18px}
.breadcrumbs{color:var(--muted);font-size:.92rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

#main{padding:22px 18px 28px 18px}
.paper{background:var(--paper);border:1px solid var(--border);border-radius:18px;box-shadow:var(--shadow);padding:18px;min-height:220px}

.container{max-width:1100px;margin:0 auto;padding:0 18px}
#footer{border-top:1px solid var(--border);background:rgba(255,255,255,.7)}
#footer .container{padding:22px 18px}
.social{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:10px}
.social a{display:inline-flex;align-items:center;gap:8px;padding:8px 10px;border:1px solid var(--border);border-radius:12px;text-decoration:none;background:#fff}
.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}

@media (max-width: 900px){
  .app{grid-template-columns: 1fr}
  #rail{position:relative;height:auto}
}