body {
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  line-height: 1.6;
  color: #333;
}

.topbar {
  background: #1f1f1f;
  padding: 15px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.topbar a {
  color: #fff;
  margin-left: 20px;
  text-decoration: none;
}

.logo {
  height: 45px;
}

.hero {
  background: linear-gradient(rgba(0,0,0,.6),rgba(0,0,0,.6)),
              url("../images/hero.jpg") center/cover;
  color: #fff;
  padding: 120px 20px;
  text-align: center;
}

.hero button {
  padding: 14px 28px;
  background: #ff9800;
  border: none;
  font-size: 16px;
  cursor: pointer;
}

.section {
  padding: 60px 80px;
}

.section.gray {
  background: #f4f4f4;
}

.product-grid, .cert-grid {
  display: flex;
  gap: 30px;
}

.product-card, .cert-card {
  background: #fff;
  padding: 20px;
  box-shadow: 0 5px 15px rgba(0,0,0,.1);
  flex: 1;
}

.product-card img, .cert-card img {
  width: 100%;
  height: 450px;
  object-fit: cover;
}

iframe {
  width: 100%;
  height: 500px;
  border: none;
}

.download-btn {
  display: inline-block;
  margin-top: 15px;
  background: green;
  color: #fff;
  padding: 12px 20px;
  text-decoration: none;
}

footer {
  background: #1f1f1f;
  color: #fff;
  text-align: center;
  padding: 15px;
}
footer a {
  color: #ff9800;
  text-decoration: none;
}
footer a:hover {
  text-decoration: underline;
}
footer p {
  margin: 5px 0;
}
.whatsapp-float {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 999;
}

.whatsapp-float img {
  width: 55px;
  height: 55px;
}





.banner-slider {
  position: relative;
  height: 90vh;
  overflow: hidden;
}

.slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  opacity: 0;
  transition: opacity 1s ease;
}

.slide.active {
  opacity: 1;
  z-index: 1;
}

.slide::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,.55);
}

.slide-content {
  position: relative;
  z-index: 2;
  color: #fff;
  text-align: center;
  top: 50%;
  transform: translateY(-50%);
  padding: 20px;
}

.slide-content h1 {
  font-size: 48px;
  margin-bottom: 10px;
}

.slide-content p {
  font-size: 20px;
}

.nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  color: #fff;
  font-size: 40px;
  cursor: pointer;
  z-index: 3;
  padding: 10px;
  background: rgba(0,0,0,.4);
}

.nav.prev { left: 20px; }
.nav.next { right: 20px; }

/* Mobile */
@media(max-width:768px){
  .slide-content h1 { font-size: 30px; }
  .slide-content p { font-size: 16px; }
}

.banner-slider {
  position: relative;
  height: 92vh;
  overflow: hidden;
}

.slide {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0;
  transition: opacity 1.2s ease-in-out;
}

.slide.active {
  opacity: 1;
  z-index: 1;
}

.slide::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.55);
}

.slide-content {
  position: absolute;
  bottom: 18%;
  left: 8%;
  color: #fff;
  max-width: 600px;
}

.slide-content h1 {
  font-size: 44px;
  margin-bottom: 10px;
}

.slide-content p {
  font-size: 20px;
  opacity: 0.95;
}

.nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 42px;
  color: #fff;
  background: rgba(0,0,0,.4);
  padding: 10px 15px;
  cursor: pointer;
  z-index: 10;
}

.nav.prev { left: 20px; }
.nav.next { right: 20px; }

@media(max-width:768px){
  .slide-content h1 { font-size: 28px; }
  .slide-content p { font-size: 16px; }
  .slide-content { left: 5%; bottom: 15%; }
}

.nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 42px;
  color: #fff;
  background: rgba(0,0,0,.4);
  padding: 10px 15px;
  cursor: pointer;
  z-index: 10;
}

.nav.prev { left: 20px; }
.nav.next { right: 20px; }

@media(max-width:768px){
  .slide-content h1 { font-size: 28px; }
  .slide-content p { font-size: 16px; }
  .slide-content { left: 5%; bottom: 15%; }
}



.isi-badge {
  position: absolute;
  top: 25px;
  right: 30px;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(255,255,255,0.92);
  padding: 8px 14px;
  border-radius: 6px;
  box-shadow: 0 4px 12px rgba(0,0,0,.25);
}

.isi-badge img {
  height: 40px;
}

.isi-badge span {
  font-weight: 600;
  color: #000;
  font-size: 14px;
}

/* Mobile */
@media(max-width:768px){
  .isi-badge {
    top: 15px;
    right: 15px;
    padding: 6px 10px;
  }
  .isi-badge img {
    height: 32px;
  }
}


.pro-tips {
  margin-top: 30px;
  background: #f8f9fa;
  border-left: 5px solid #ff9800;
  padding: 20px 25px;
}

.pro-tips h3 {
  margin-top: 0;
  color: #222;
}

.pro-tips ul {
  margin: 0;
  padding-left: 18px;
}

.pro-tips li {
  margin-bottom: 10px;
  line-height: 1.5;
}

/* =========================
   GLOBAL RESPONSIVE FIXES
========================= */

* {
  box-sizing: border-box;
}

img {
  max-width: 100%;
  height: auto;
}

.section {
  padding: 40px 20px;
}

/* =========================
   TOP BAR / HEADER
========================= */

@media (max-width: 768px) {
  .topbar {
    flex-direction: column;
    align-items: center;
    padding: 12px;
  }

  .topbar nav {
    margin-top: 10px;
  }

  .topbar nav a {
    display: inline-block;
    margin: 6px 10px;
    font-size: 14px;
  }

  .logo {
    height: 38px;
  }
}

/* =========================
   BANNER SLIDER
========================= */

@media (max-width: 768px) {
  .banner-slider {
    height: 70vh;
  }

  .slide-content {
    left: 5%;
    right: 5%;
    bottom: 15%;
    max-width: 100%;
  }

  .slide-content h1 {
    font-size: 26px;
    line-height: 1.2;
  }

  .slide-content p {
    font-size: 15px;
  }

  .nav {
    font-size: 30px;
    padding: 6px 10px;
  }
}

/* =========================
   PRODUCT & CERT GRID
========================= */

.product-grid,
.cert-grid {
  display: flex;
  gap: 20px;
}

@media (max-width: 768px) {
  .product-grid,
  .cert-grid {
    flex-direction: column;
  }

  .product-card,
  .cert-card {
    width: 100%;
  }
}

/* =========================
   GALLERY FIX
========================= */

.gallery {
  overflow-x: auto;
}

.gallery img {
  min-width: 260px;
}

@media (max-width: 480px) {
  .gallery img {
    min-width: 220px;
    height: 160px;
  }
}

/* =========================
   ABOUT + PRO TIPS
========================= */

@media (max-width: 768px) {
  .pro-tips {
    padding: 15px;
  }

  .pro-tips h3 {
    font-size: 18px;
  }

  .pro-tips li {
    font-size: 14px;
  }
}

/* =========================
   PDF IFRAME
========================= */

@media (max-width: 768px) {
  iframe {
    height: 350px;
  }
}

/* =========================
   FOOTER
========================= */

@media (max-width: 768px) {
  footer {
    font-size: 13px;
    padding: 12px;
  }

  footer a {
    display: block;
    margin-top: 5px;
  }
}