:root {
            --navy: #0b1e3f;
            --blue: #0057b8;
            --cyan: #00c2ff;
            --gray-bg: #f5f7fa;
            --text-dark: #1e293b;
            --text-muted: #64748b;
            --radius: 14px;
            --shadow: 0 12px 28px rgba(0,0,0,0.08);
        }

       body {
            font-family: "Anuphan", sans-serif;
			margin: 0;
            padding: 0;
            background-color: #f9fbfd;
            color: #333;
        }

		.container {
			width: 100%;
			max-width: 1200px;
			margin: 0 auto;
			padding: 0 24px;
		}

      /* ==========================================================================
   NAVIGATION
   ========================================================================== */
		header {
			width: 100%;
			left: 0; 
			padding: 0 20px;
			background-color: #047a7e; 
			backdrop-filter: blur(12px); 
			box-shadow: 0 2px 15px rgba(0, 0, 0, 0.02); 
			position: sticky; 
			top: 0; 
			z-index: 1000; 
			color: #fff;
		}
		nav {
			display: flex;
			justify-content: space-between;
			align-items: center;
			height: 80px;
		}

		.logo {
			font-size: 22px;
			font-weight: 800;
			color: #fff;
			text-decoration: none;
			letter-spacing: -0.5px;
		}

		.nav-links {
			display: flex;
			list-style: none;
			gap: 24px;
		}

		.nav-links a {
			text-decoration: none;
			color: var(--charcoal-text);
			font-weight: 500;
			font-size: 15px;
			transition: var(--transition-smooth);
		}

		.nav-links a:hover, .logo:hover {
			color: #87CEEB; /* สีฟ้าอ่อน (Sky Blue) */
		}

		/* สำหรับหน้าปัจจุบัน (Contact) ให้แสดงเป็นสีฟ้าอ่อนค้างไว้ */
		.nav-links a.active {
			color: #87CEEB;
			font-weight: bold; 
		}

        .manual-card {
            background: #fff;
            padding: 40px;
            border-radius: #047a7e;
            box-shadow: #047a7e;
            border-left: 6px solid #047a7e;
        }

       h1 {
            font-size: 32px;
            margin-bottom: 40px;
            font-weight: bold;
        }
        h2 {
            font-size: 24px;
            margin: 0 0 12px 0;
            text-align: left;
            width: 100%;
        }
        h3 {
            font-size: 18px;
			margin: 0;
            padding: 0;
            text-align: left;
            width: 100%;
        }
		 h4 {
            font-size: 14px;
            margin: 0 0 12px 0;
            text-align: left;
            width: 100%;
        }

        p {
            font-size: 16px;
            line-height: 1.6;
            color: #4a5568;
            margin: 0;
            text-align: left;
        }
		a {
			  text-decoration: none;
			}

        ol li {
            margin-bottom: 14px;
            font-size: 1.00rem;
        }

        .step-details {
            margin-left: 20px;
            list-style: none;
        }
		.img-left {
			display: block;
			margin: 10px 24px 20px 0;    /* ระยะห่างจากข้อความ */
			border-radius: 12px;         /* มุมโค้งแบบ Enterprise */
			border: 2px solid #e2e8f0;   /* กรอบบางระดับองค์กร */
			border: 1px solid #e2e8f0;
			box-shadow: 0 10px 24px rgba(0,0,0,0.08); /* เงาแบบ Premium */
			max-width: 580px;            /* ควบคุมขนาดให้สวย */
		}
        .note-bule {
            background: #E0FFFF;
            border-left: 5px solid #00BFFF;
            padding: 16px;
            border-radius: var(--radius);
            margin-top: 20px;
            color: #000080;
            font-weight: 600;
        }
		.note-red {
            background: #fff7f7;
            border-left: 5px solid #ef4444;
            padding: 16px;
            border-radius: var(--radius);
            margin-top: 20px;
            color: #b91c1c;
            font-weight: 600;
        }
        footer {
            margin-top: 60px;
            background-color: #047a7e; 
            color: #cbd5e1;
            padding: 50px 0;
            text-align: center;
        }
        footer h2 {
            color: #fff;
            margin-bottom: 10px;
        }
		 footer p {
            font-size: 16px;
            line-height: 1.6;
            color: #4a5568;
            margin: 0;
            text-align: left;
        }
        .back-top {
            position: fixed;
            bottom: 24px;
            right: 24px;
            background: var(--blue);
            color: #fff;
            padding: 12px 18px;
            border-radius: 8px;
            text-decoration: none;
            box-shadow: var(--shadow);
        }