.houli-rd {

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

font-family:
"Inter",
"Arial",
"Helvetica Neue",
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;

font-weight:700;

}


.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;

}





/* Cards */

.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;

}





/* Development 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;

}

}