.houli-rd {

max-width:1200px;
margin:0 auto;
padding:30px 20px;

font-family:
"Noto Sans KR",
"Inter",
Arial,
sans-serif;

color:#333;
line-height:1.8;

}


/* Hero */

.houli-rd .rd-hero {


background:
linear-gradient(
135deg,
#0B1F33,
#163A55
);


padding:55px 45px;

border-radius:16px;

text-align:center;

color:white;

margin-bottom:70px;


}



.rd-tag {


font-size:14px;

letter-spacing:2px;

color:#F58220;

font-weight:700;

text-transform:uppercase;


}



.rd-hero h1 {


font-size:44px;

line-height:1.25;

margin:15px 0;

color:white;


}



.rd-hero p {


max-width:850px;

margin:auto;

font-size:18px;

color:#E8EEF3;


}





/* Section Title */


.rd-title {


text-align:center;

max-width:900px;

margin:0 auto 40px;


}



.rd-title span {


font-size:14px;

letter-spacing:2px;

color:#F58220;

font-weight:700;


}



.rd-title h2 {


font-size:32px;

color:#0B1F33;

margin:12px 0;


}



.rd-title p {


font-size:16px;

color:#666;


}





/* Engineering Card */


.rd-grid {


display:grid;

grid-template-columns:
repeat(4,1fr);

gap:25px;

margin-bottom:70px;


}



.rd-card {


background:#fff;

padding:30px;

border-radius:12px;


border:

1px solid #E6E9ED;


border-top:

4px solid #F58220;


box-shadow:

0 8px 25px rgba(0,0,0,.06);


}



.rd-card h3 {


font-size:21px;

color:#0B1F33;

margin-bottom:15px;


}



.rd-card p {


font-size:15px;

color:#555;


}





/* Process Image */


.rd-process {


background:#F5F7FA;

padding:45px;

border-radius:16px;

margin-bottom:70px;


}



.rd-process img {


width:100%;

border-radius:10px;


}





/* Testing */


.rd-testing {


background:#F5F7FA;

padding:55px 35px;

border-radius:16px;

margin-bottom:70px;


}



.test-grid {


display:grid;

grid-template-columns:
repeat(4,1fr);

gap:20px;


}



.test-item {


background:#fff;

padding:25px;

border-radius:10px;

text-align:center;

border:1px solid #E5E9EC;


}



.test-item strong {


display:block;

font-size:18px;

color:#0B1F33;

margin-bottom:8px;


}





/* OEM */


.rd-oem {


margin-bottom:70px;


}



.oem-grid {


display:grid;

grid-template-columns:
repeat(4,1fr);

gap:18px;


}



.oem-item {


background:#F5F7FA;

padding:22px;

border-radius:8px;

text-align:center;

font-weight:600;

color:#0B1F33;


}





/* Application */


.application {


display:grid;

grid-template-columns:
repeat(3,1fr);

gap:25px;

margin-bottom:70px;


}



.application div {


background:#fff;

padding:30px;

border-radius:12px;


box-shadow:

0 8px 25px rgba(0,0,0,.06);


border:1px solid #E6E9ED;


}



.application h3 {


color:#0B1F33;


}






/* CTA */


.rd-cta {


background:#F58220;

padding:50px 30px;

border-radius:16px;

text-align:center;

color:white;


}



.rd-cta h2 {


color:white;

font-size:32px;


}



.rd-cta p {


color:white;


}



.rd-btn {


display:inline-block;

background:white;

color:#F58220;

padding:14px 35px;

border-radius:6px;

font-weight:700;

text-decoration:none;

margin-top:20px;


}



@media(max-width:900px){


.rd-grid,
.test-grid,
.oem-grid,
.application{


grid-template-columns:
repeat(2,1fr);


}


}



@media(max-width:600px){


.rd-grid,
.test-grid,
.oem-grid,
.application{


grid-template-columns:
1fr;


}


.rd-hero h1{


font-size:32px;


}


.rd-process{


padding:20px;


}


}