/* ================= ROOT ================= */
:root{
--primary:#ff7a00;
--secondary:#0d1b2a;
--bg:#f4f6f9;
--text:#333;
--radius:12px;
}

/* ================= BASE ================= */
body{
margin:0;
font-family:system-ui, Arial, sans-serif;
background:var(--bg);
color:var(--text);
line-height:1.7;
}

/* ================= HEADER (LOCKED SYSTEM) ================= */
.header{
background:var(--secondary);
border-bottom:1px solid rgba(255,255,255,0.05);
}

.header-container{
max-width:1150px;
margin:auto;
padding:14px 20px;
display:flex;
justify-content:space-between;
align-items:center;
}

/* LOGO */
.brand{
font-size:26px;
font-weight:700;
letter-spacing:0.3px;
}

.brand a{
text-decoration:none;
}

.brand span:nth-child(1){color:var(--primary);}
.brand span:nth-child(2){color:#4da6ff;}
.brand span:nth-child(3){color:#fff;}

/* NAV */
.nav-menu{
display:flex;
gap:18px;
}

.nav-menu a{
color:#fff;
font-size:14px;
text-decoration:none;
position:relative;
padding:6px 2px;
}

/* HOVER */
.nav-menu a::after{
content:"";
position:absolute;
left:0;
bottom:0;
width:0;
height:2px;
background:var(--primary);
transition:0.25s;
}

.nav-menu a:hover::after{
width:100%;
}

/* ================= CONTAINER ================= */
.container{
max-width:900px;
margin:40px auto;
width:90%;
}

/* ================= ARTICLE ================= */
.article{
background:#fff;
padding:42px;
border-radius:var(--radius);
box-shadow:0 15px 45px rgba(0,0,0,0.07);
}

/* ================= TYPO ================= */
h1{font-size:32px;margin-bottom:15px;}
h2{margin-top:30px;}

p{
margin:14px 0;
text-align:justify;
}

/* ================= IMAGE ================= */
.hero{
width:100%;
height:260px;
object-fit:cover;
border-radius:var(--radius);
margin:20px 0;
}

/* ================= CTA ================= */
.cta{
display:inline-block;
padding:14px 28px;
background:var(--primary);
color:#fff;
border-radius:10px;
text-decoration:none;
font-weight:600;
}

/* ================= BOX ================= */
.box{
background:#f1f5f9;
padding:20px;
border-radius:var(--radius);
margin:25px 0;
text-align:center;
}

/* ================= CALCULATOR ================= */
.calc{
background:#fff;
padding:30px;
border-radius:var(--radius);
box-shadow:0 10px 30px rgba(0,0,0,0.06);
text-align:center;
}

.calc input,
.calc select{
width:240px;
padding:14px;
margin:10px;
border-radius:8px;
border:1px solid #ccc;
}

.calc button{
padding:14px 28px;
background:var(--primary);
color:#fff;
border:none;
border-radius:10px;
font-weight:bold;
cursor:pointer;
}

/* ================= FOOTER ================= */
.footer{
margin-top:40px;
padding:30px;
background:var(--secondary);
color:#fff;
text-align:center;
}

/* ================= STICKY ================= */
.sticky{
position:fixed;
bottom:15px;
left:50%;
transform:translateX(-50%);
}

.sticky a{
background:var(--primary);
color:#fff;
padding:12px 22px;
border-radius:30px;
text-decoration:none;
}