/* =========================================
           ROOT VARIABLES & GLOBAL STYLES
           ========================================= */
:root {
  --rs-primary-red: #a51c24;
  --rs-dark-red: #7a131a;
  --rs-steel-silver: #d1d6db;
  --rs-bg-light: #ffffff;
  --rs-bg-offwhite: #f8f9fa;
  --rs-bg-luxury-dark: #121416;
  --rs-bg-card-dark: #1c1f22;
  --rs-text-light: #ffffff;
  --rs-text-dark: #1a1d20;
  --rs-text-muted: #5a6268;
  --rs-text-gray: #a0aab2;
  --rs-font-heading: "Oswald", sans-serif;
  --rs-font-body: "Poppins", sans-serif;
  --rs-transition-smooth: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

body {
  font-family: var(--rs-font-body);
  /* Set to light theme */
  background-color: var(--rs-bg-light);
  color: var(--rs-text-dark);
  overflow-x: hidden;
  margin: 0;
  padding: 0;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--rs-font-heading);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Unique Global Classes for Applications Page */
.rs-app-subtitle {
  color: var(--rs-primary-red);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 15px;
  display: inline-block;
  position: relative;
  padding-left: 45px;
}

.rs-app-subtitle::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 30px;
  height: 2px;
  background-color: var(--rs-primary-red);
}

.rs-app-title {
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 20px;
  color: var(--rs-text-dark);
}

.rs-app-title span {
  color: var(--rs-primary-red);
}

.rs-app-btn {
  background: var(--rs-primary-red);
  border: 2px solid var(--rs-primary-red);
  color: var(--rs-text-light);
  padding: 15px 40px;
  font-family: var(--rs-font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 1px;
  position: relative;
  overflow: hidden;
  z-index: 1;
  transition: var(--rs-transition-smooth);
  text-transform: uppercase;
  border-radius: 0;
  display: inline-block;
  text-decoration: none;
  cursor: pointer;
}

.rs-app-btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--rs-text-dark);
  z-index: -1;
  transition: var(--rs-transition-smooth);
}

.rs-app-btn:hover::before {
  left: 0;
}

.rs-app-btn:hover {
  color: var(--rs-text-light) !important;
  border-color: var(--rs-text-dark);
}

/* =========================================
           1. INNER PAGE HERO BANNER
           ========================================= */
.rs-app-hero {
  position: relative;
  height: 70vh;
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  /* Industrial pipeline background */
  background:
    linear-gradient(to bottom, rgba(18, 20, 22, 0.51), rgba(18, 20, 22, 0.803)),
    url("../images/banner/quality-ban.jpg") center/cover no-repeat fixed;
  text-align: center;
  color: var(--rs-text-light);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.rs-app-hero-title {
  font-size: 4.5rem;
  font-weight: 700;
  margin-bottom: 15px;
  letter-spacing: 2px;
  text-shadow: 0 5px 15px rgba(0, 0, 0, 0.5);
}

.rs-app-breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
  font-size: 1.1rem;
  font-weight: 500;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.rs-app-breadcrumb a {
  color: var(--rs-text-light);
  text-decoration: none;
  transition: var(--rs-transition-smooth);
}

.rs-app-breadcrumb a:hover {
  color: var(--rs-primary-red);
}

.rs-app-breadcrumb span {
  color: var(--rs-primary-red);
}

/* =========================================
           2. INDUSTRIES GRID SECTION
           ========================================= */
.rs-app-grid-sec {
  padding: 100px 0;
  background-color: var(--rs-bg-light);
}

.rs-app-desc {
  color: var(--rs-text-muted);
  font-size: 1.1rem;
  max-width: 800px;
  line-height: 1.6;
  margin-bottom: 50px;
  font-weight: 300;
}

.rs-app-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

/* Application Card Styles */
.rs-app-card {
  display: block;
  text-decoration: none;
  cursor: pointer;
  group: card;
}

.rs-app-img-wrap {
  width: 100%;
  aspect-ratio: 4/3; /* Keeps all images uniform */
  overflow: hidden;
  position: relative;
  background-color: var(--rs-bg-offwhite);
  margin-bottom: 15px;
  border-bottom: 3px solid transparent;
  transition: var(--rs-transition-smooth);
}

.rs-app-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  /* Slight dark filter by default for premium look */
  filter: brightness(0.8) grayscale(20%);
  transition:
    transform 0.8s cubic-bezier(0.25, 0.8, 0.25, 1),
    filter 0.5s;
}

/* Hover Effects */
.rs-app-card:hover .rs-app-img-wrap {
  border-bottom-color: var(--rs-primary-red);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.rs-app-card:hover .rs-app-img {
  transform: scale(1.1);
  filter: brightness(1) grayscale(0%);
}

.rs-app-title-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 10px;
  position: relative;
}

/* Animated Red Line on Hover */
.rs-app-title-wrap::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 1px;
  background-color: var(--rs-primary-red);
  transition: width 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.rs-app-card:hover .rs-app-title-wrap::after {
  width: 100%;
}

.rs-app-card-title {
  font-family: var(--rs-font-body);
  font-size: 1.1rem;
  color: var(--rs-text-dark);
  font-weight: 500;
  margin: 0;
  transition: var(--rs-transition-smooth);
}

.rs-app-card:hover .rs-app-card-title {
  color: var(--rs-primary-red);
}

.rs-app-icon {
  color: var(--rs-primary-red);
  font-size: 0.9rem;
  opacity: 0;
  transform: translateX(-10px);
  transition: var(--rs-transition-smooth);
}

.rs-app-card:hover .rs-app-icon {
  opacity: 1;
  transform: translateX(0);
}

/* =========================================
           3. CTA STRIP (Extra Sexy Touch)
           ========================================= */
.rs-app-cta-sec {
  padding: 80px 0;
  background:
    linear-gradient(
      90deg,
      rgba(165, 28, 36, 0.95) 0%,
      rgba(122, 19, 26, 0.95) 100%
    ),
    url("../images/backgrounds/abt-pg-bg.jpeg") center/cover fixed;
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.rs-app-cta-title {
  font-size: 2.5rem;
  margin-bottom: 20px;
  color: var(--rs-text-light);
}

.rs-app-cta-desc {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.8);
  max-width: 600px;
  margin: 0 auto 30px auto;
}

/* Responsive Adjustments */
@media (max-width: 1199px) {
  .rs-app-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }
}

@media (max-width: 991px) {
  .rs-app-hero-title {
    font-size: 3rem;
  }
  .rs-app-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .rs-app-title {
    font-size: 2.5rem;
  }
}

@media (max-width: 575px) {
  .rs-app-grid {
    grid-template-columns: 1fr;
  }
  .rs-app-cta-title {
    font-size: 2rem;
  }
}