:root{
      color-scheme: light;
      --bg: #f7f7f7;
      --bg-cyan: #e0fbff;
      --ink: #0b1220;
      --ink-inv: #ffffff;
      --muted: #4b5563;
      --card: #ffffff;
      --border: #e5e7eb;
      --green: #10b981;
      --green-dark: #0ea171;
      --cyan:  #06b6d4;
      --shadow: 0 10px 30px rgba(15, 23, 42, .08);
    }
    html{scroll-behavior:smooth;}
    body{
      margin:0;
      font: 15px/1.6 system-ui,-apple-system,Segoe UI,Roboto,"Helvetica Neue",Arial,"Noto Sans";
      color:var(--ink);
      background: linear-gradient(180deg, var(--bg) 0%, var(--bg-cyan) 100%);
    }
    .wrap{max-width:1100px;margin:0 auto;padding:0 16px;}

    header.nav{
      position:sticky;top:0;z-index:20;
      background: var(--green);
      color: var(--ink-inv);
      border-bottom: 1px solid rgba(255,255,255,.2);
    }
    header .inner{height:64px;display:flex;align-items:center;justify-content:space-between;}
    .brand img{height:42px}
    .nav-links{display:none;gap:18px;align-items:center;}
    .nav-links a{color:var(--ink-inv);text-decoration:none;border-bottom:2px solid transparent;padding-bottom:2px}
    .nav-links a:hover{border-bottom-color:rgba(255,255,255,.9)}
    .burger{
      display:inline-flex;align-items:center;justify-content:center;
      width:40px;height:40px;border-radius:10px;border:1px solid rgba(255,255,255,.4);
      background: rgba(255,255,255,.08);color:#fff;cursor:pointer;
    }
    .burger svg{width:22px;height:22px}
    .mobile-menu{
      display:none;background: var(--green);color:var(--ink-inv);
      border-top:1px solid rgba(255,255,255,.25);
    }
    .mobile-menu a{
      display:block;padding:12px 16px;color:var(--ink-inv);text-decoration:none;
      border-bottom:1px solid rgba(255,255,255,.18);
    }
    .mobile-menu a:last-child{border-bottom:none;}

    @media(min-width:900px){
      .burger{display:none}
      .nav-links{display:flex}
      .mobile-menu{display:none !important}
    }

    .hero{padding:56px 0 12px}
    .h1{font-weight:800;letter-spacing:-.02em;font-size:clamp(28px,3.6vw,44px)}
    .muted{color:var(--muted)}
    .cta{display:flex;gap:12px;margin-top:18px;flex-wrap:wrap}

    .btn{display:inline-block;padding:10px 16px;border-radius:14px;border:1px solid var(--border);background:#f8fafc;color:var(--ink);transition:box-shadow .2s,transform .06s;text-decoration:none}
    .btn:hover{box-shadow:var(--shadow);transform:translateY(-1px)}
    .btn[aria-disabled="true"]{opacity:.55;cursor:not-allowed}
    .btn-green{border-color:color-mix(in oklab,var(--green) 35%,var(--border));background:linear-gradient(135deg,rgba(16,185,129,.15),#f8fafc)}
    .btn-cyan{ border-color:color-mix(in oklab,var(--cyan) 35%,var(--border)); background:linear-gradient(135deg,rgba(6,182,212,.15),#f8fafc)}

    .panel{border:1px solid var(--border);border-radius:18px;background:var(--card);padding:18px;box-shadow:0 2px 8px rgba(15,23,42,.04)}
    .grid{display:grid;gap:16px}
    @media(min-width:640px){.grid.cols-2{grid-template-columns:repeat(2,1fr)}}
    @media(min-width:960px){.grid.cols-3{grid-template-columns:repeat(3,1fr)}}
    .tag{font-size:12px;border:1px solid #d1fae5;border-radius:999px;padding:4px 8px;background:#ecfdf5;color:#065f46}
    .tag-cyan{border-color:#cffafe;background:#ecfeff;color:#0e7490}

    .app{transition:box-shadow .2s, transform .06s}
    .app:hover{box-shadow:var(--shadow);transform:translateY(-1px)}
    section{scroll-margin-top:90px;padding:36px 0}
    h2{font-size:clamp(22px,2.5vw,28px);margin:0 0 12px}
    footer{border-top:1px solid var(--border);padding:28px 0;margin-top:24px}
    input,textarea,select{width:100%;padding:12px 14px;border-radius:12px;border:1px solid var(--border);background:#fff;color:var(--ink);box-sizing:border-box}
    .list{padding-left:18px}.list li{margin:6px 0}
    .chips{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
    .app-head{display:flex;gap:12px;align-items:center}
    .brand{display:flex;align-items:center;gap:10px}
    .logo{width:44px;height:44px;border-radius:12px;background:#f0f9ff;border:1px solid var(--border);display:grid;place-items:center;overflow:hidden}
    .logo img{width:100%;height:100%;object-fit:cover;display:block}
    .logo-fallback{font-weight:700;color:#0e7490}
    .btnrow{display:flex;gap:10px;flex-wrap:wrap;margin-top:10px}
    .small{font-size:13px;color:var(--muted)}
    .form-grid{display:grid;grid-template-columns:1fr;gap:12px}
    @media(min-width:640px){ .form-grid{grid-template-columns:1fr 1fr} }
    .form-grid p{margin:0}
    
    /* Calendar Tools Styles */
    .tools-container{margin-top:24px}
    .tool-group{display:flex;gap:12px}
    .tool-result{margin-top:12px;padding:12px;background:var(--bg-cyan);border-radius:12px;font-weight:600}
    .cal-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:2px;margin-top:8px;max-width:700px;margin-left:auto;margin-right:auto}
    .cal-day{aspect-ratio:1;display:flex;flex-direction:column;align-items:center;justify-content:center;border-radius:4px;font-weight:600;cursor:pointer;transition:all 0.2s;border:1px solid var(--border);background:var(--card);padding:4px;position:relative;min-height:56px}
    .cal-day:hover{background:var(--bg-cyan);transform:scale(1.02)}
    .cal-day.today{background:#e63946;color:#fff;border-color:#e63946;font-weight:800}
    .cal-day.has-events{background:#023e8a;color:#fff;border-color:#023e8a}
    .cal-header{text-align:center;padding:6px;font-weight:700;font-size:11px;color:var(--muted);background:var(--card);border-radius:4px;margin-bottom:2px}
    .tab-btn{transition:all 0.2s}
    .tool-group{display:grid;grid-template-columns:1fr 1fr;gap:8px}
    
    /* Geez and Arabic numerals */
    .cal-geez{font-size:16px;line-height:1.2;font-weight:700}
    .cal-arabic{font-size:11px;line-height:1;opacity:0.7;margin-top:2px}
    .cal-day.today .cal-arabic,.cal-day.has-events .cal-arabic{opacity:1}
    
    /* Calendar container */
    .calendar-container{display:flex;justify-content:center;margin:16px 0}
    
    /* Submenu styles */
    #submenu a:hover{background:var(--bg-cyan)}
    .view-content{min-height:400px}
    
    /* Sidebar ad styles */
    .main-layout{display:grid;grid-template-columns:200px 1fr 200px;gap:16px;align-items:start}
    .sidebar-ad{width:200px;position:sticky;top:90px;background:var(--card);border:1px solid var(--border);border-radius:12px;padding:12px;min-height:600px;display:flex;align-items:center;justify-content:center}
    .sidebar-ad p{margin:0;color:var(--muted);font-size:13px;text-align:center}
    @media(max-width:1200px){.main-layout{grid-template-columns:150px 1fr 150px}.sidebar-ad{width:150px;min-height:500px}}
    @media(max-width:900px){.main-layout{grid-template-columns:1fr}.sidebar-ad{position:static;width:100%;min-height:100px;margin-bottom:16px}}