/* ============================================
   GLOBAL LIGHT THEME
============================================ */
body {
  margin: 0;
  padding: 0;
  font-family: 'Poppins', sans-serif;
  background: #f3fcff; /* light aqua-white */
  color: #123c4c;       /* deep aqua text */
}

h1, h2, h3 {
  font-family: 'Orbitron', 'Poppins', sans-serif;
  letter-spacing: 1px;
}

.section {
  padding: 20px 20px;
}

.container {
  max-width: 1200px;
  margin: auto;
}

.container.narrow {
  max-width: 800px;
}

/* ============================================
   HERO — LIGHT GLASS + SOFT GLOW
============================================ */
.hero {
  height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
  background: url('images/Smart\ wastewater\ treatment\ plants\ with\ visible\ tanks\ and\ pipes..jpg') center/cover no-repeat;
}

/* soft white overlay instead of dark */
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    rgba(255, 255, 255, 0.35),
    rgba(240, 250, 255, 0.8)
  );
}

.hero-content {
  position: relative;
  z-index: 3;
  padding: 28px 40px;
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(0, 160, 200, 0.25);
  border-radius: 18px;
  backdrop-filter: blur(12px);
  box-shadow: 0 0 18px rgba(0,180,255,0.25);
  animation: fadeUp 1.2s ease forwards;
  margin-top: 100px; /* adjust higher or lower */

}

.hero-title {
  font-size: clamp(2.4rem, 5vw, 3.5rem);
  color: #0a4052;
  text-shadow: 0 0 10px rgba(0,180,255,0.35);
  margin-bottom: 12px;
}

.hero-subtitle {
  margin-top: 2px;
  font-size: 1.15rem;
  color: #185d6f;
  line-height: 1.6;
}

/* fade-up animation still the same */
@keyframes fadeUp {
  0% { opacity: 0; transform: translateY(40px); }
  100% { opacity: 1; transform: translateY(0); }
}

/* ============================================
   INTRO SECTION — Light & Clean
============================================ */
.intro h2 {
  text-align: center;
  font-size: 2.2rem;
  margin-bottom: 0;
  margin-top: 30px;
  color: #0d5068;
}

.intro p {
  margin-top: 10px;
  font-size: 1.1rem;
  color: #2b6a7a;
  line-height: 1.8;
  text-align: center;
}

/* ============================================
   CATEGORY CARDS — Light Glass
============================================ */
.categories h2 {
  text-align: center;
  font-size: 2.3rem;
  margin-bottom: 40px;
  color: #0d5873;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.category-card {
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid rgba(0, 180, 255, 0.25);
  padding: 30px;
  border-radius: 18px;
  box-shadow:
      0 0 18px rgba(0,180,255,0.18),
      inset 0 0 12px rgba(0,180,255,0.07);
  backdrop-filter: blur(10px);
  transition: 0.35s ease;
}

.category-card:hover {
  transform: translateY(-10px);
  box-shadow:
      0 0 20px rgba(0,180,255,0.35),
      inset 0 0 24px rgba(0,180,255,0.15);
}

.category-card h3 {
  text-align: center;
  margin-bottom: 15px;
  font-size: 1.35rem;
  color: #0e6f8c;
  text-shadow: 0 0 4px rgba(0,180,255,0.3);
}

.category-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.category-card ul li {
  padding: 6px 0;
  border-bottom: 1px solid rgba(0,0,0,0.06);
  color: #32778b;
  font-size: 0.98rem;
}

.category-card ul li:last-child {
  border-bottom: none;
}

/* ============================================
   JOIN SECTION — Light Glass Form
============================================ */
.join h2 {
  text-align: center;
  font-size: 2.3rem;
  margin-bottom: 18px;
  color: #0f5268;
}

.join p {
  text-align: center;
  color: #2b6b7c;
  font-size: 1.1rem;
  margin-bottom: 35px;
}

.partner-form {
  background: rgba(255, 255, 255, 0.6);
  padding: 40px 45px;
  border-radius: 18px;
  border: 1px solid rgba(0,180,255,0.25);
  box-shadow: 0 0 18px rgba(0,180,255,0.15);
  backdrop-filter: blur(12px);
  display: grid;
  gap: 24px;
  grid-template-columns: 1fr 1fr;
}

.form-group.full {
  grid-column: span 2;
}

label {
  display: block;
  font-size: 1.2rem;
  margin-bottom: 6px;
  color: #0d6680;
}

input, select, textarea {
  width: 100%;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(0,180,255,0.3);
  color: #145165;
  border-radius: 8px;
  font-size: 1.2rem;
  outline: none;
  transition: 0.25s ease;
}

input:focus, select:focus, textarea:focus {
  border-color: #00aaff;
  box-shadow: 0 0 12px rgba(0,180,255,0.4);
}

/* Submit Button */
.submit-btn {
  grid-column: span 2;
  padding: 14px 10px;
  background: linear-gradient(135deg, #00baff, #3ccfec);
  border: none;
  border-radius: 10px;
  font-size: 1.2rem;
  color: #ffffff;
  cursor: pointer;
  transition: 0.3s ease;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
}

.submit-btn:hover {
  background: linear-gradient(135deg, #00d9ff, #6ee8ff);
  box-shadow: 0 0 20px rgba(0,180,255,0.4);
}

/* Mobile */
@media (max-width: 700px) {
  .partner-form {
    grid-template-columns: 1fr;
  }
  .submit-btn {
    grid-column: span 1;
  }
}

/* ==============================
   Styles for screens 1400px and up
   ============================== */
   @media (min-width: 1400px) {

    /* HERO */
    .hero {
      height: 80vh;                 /* full-screen feel */
      padding: 0 5%;                /* horizontal padding */
    }
  
    .hero-content {
      max-width: 1200px;            /* wider content */
      margin: 0 auto;
      text-align: center;
    }
  
    .hero-title {
      font-size: 4rem;              /* bigger title */
      line-height: 1.1;
    }
  
    .hero-subtitle {
      font-size: 1.8rem;            /* larger subtitle */
      line-height: 1.5;
      margin-top: 1rem;
      max-width: 900px;
      margin-left: auto;
      margin-right: auto;
    }
  
    /* INTRO SECTION */
    .section.intro .container.narrow {
      max-width: 1200px;
      margin: 0 auto;
      text-align: center;
      padding: 4rem 2rem;           /* vertical spacing */
    }
  
    .section.intro h2 {
      font-size: 2.5rem;
      margin-bottom: 1.5rem;
    }
  
    .section.intro p {
      font-size: 1.3rem;
      line-height: 1.8;
      margin-bottom: 3rem;
    }
  
    /* CATEGORIES SECTION */
    .section.categories .container {
      max-width: 1400px;
      margin: 0 auto;
      padding: 4rem 2rem;
    }
  
    .section.categories h2 {
      font-size: 2.5rem;
      margin-bottom: 2rem;
      text-align: center;
    }
  
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2.5rem;
    }
  
    .category-card {
      background: #f5f9fc;
      border-radius: 12px;
      padding: 2rem;
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
  
    .category-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 12px 25px rgba(0,0,0,0.12);
    }
  
    .category-card h3 {
      font-size: 1.8rem;
      margin-bottom: 1rem;
    }
  
    .category-card ul li {
      font-size: 1.1rem;
      line-height: 1.6;
      margin-bottom: 0.6rem;
    }
  
    /* JOIN SECTION */
    .section.join .container.narrow {
      max-width: 1200px;
      margin: 0 auto;
      text-align: center;
      padding: 4rem 2rem;
    }
  
    .section.join h2 {
      font-size: 2.5rem;
      margin-bottom: 1.5rem;
    }
  
    .section.join p {
      font-size: 1.3rem;
      line-height: 1.8;
      margin-bottom: 2.5rem;
    }
  
    /* FORM FIELDS */
    .partner-form .form-group label {
      font-size: 1.1rem;
      display: block;
      margin-bottom: 0.5rem;
      font-weight: 600;
    }
  
    .partner-form .form-group input,
    .partner-form .form-group select,
    .partner-form .form-group textarea {
      font-size: 1.1rem;
      padding: 0.8rem 1rem;
      width: 100%;
      border-radius: 8px;
      border: 1px solid #ccc;
    }
  
    .partner-form .form-group.full textarea {
      min-height: 150px;
    }
  
    /* SUBMIT BUTTON */
    .partner-form .submit-btn {
      font-size: 1.2rem;
      padding: 1rem 2.5rem;
      border-radius: 25px;
      margin-top: 1rem;
      cursor: pointer;
      transition: all 0.3s ease;
    }
  
    .partner-form .submit-btn:hover {
      transform: translateY(-3px);
      box-shadow: 0 8px 20px rgba(0,0,0,0.15);
    }
  
  }
 /* ==============================
   1400px+ Screens
   ============================== */
@media (min-width: 1400px) {

  /* HERO */
  .hero {
    height: 75vh;
    padding: 0 5%;
  }

  .hero-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
  }

  .hero-title {
    font-size: 4.5rem;  /* bigger title */
    line-height: 1.1;
  }

  .hero-subtitle {
    font-size: 2.1rem;   /* bigger subtitle */
    line-height: 1.5;
    margin-top: 1rem;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
  }

  /* INTRO SECTION */
  .section.intro .container.narrow {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
    padding: 3rem 2rem;  /* closer vertical spacing */
  }

  .section.intro h2 {
    font-size: 3.3rem;
    margin-bottom: 1rem;  /* tighter spacing */
  }

  .section.intro p {
    font-size: 1.9rem;
    line-height: 1.8;
    margin-bottom: 2rem;  /* tighter bottom margin */
  }

  /* CATEGORIES SECTION */
  .section.categories .container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 3rem 2rem; /* reduce spacing */
  }

  .section.categories h2 {
    font-size: 3rem;
    margin-bottom: 2.7rem;
    text-align: center;
  }

  .grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;  /* tighter gap between cards */
  }

  .category-card {
    background: #f5f9fc;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 8px 20px rgba(0,0,0,0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .category-card h3 {
    font-size: 2rem;  /* bigger h3 */
    margin-bottom: 1rem;
  }

  .category-card ul li {
    font-size: 1.8rem;  /* bigger list text */
    line-height: 1.6;
    margin-bottom: 0.5rem;
  }

  /* JOIN SECTION */
  .section.join .container.narrow {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
    padding: 3rem 2rem;  /* reduce top/bottom spacing */
  }

  .section.join h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
  }

  .section.join p {
    font-size: 1.8rem;
    line-height: 1.8;
    margin-bottom: 2rem;
  }

  /* FORM FIELDS */
  .partner-form .form-group label {
    font-size: 1.8rem;
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
  }

  .partner-form .form-group input,
  .partner-form .form-group select,
  .partner-form .form-group textarea {
    font-size: 1.7rem;
    padding: 0.8rem 1rem;
    width: 100%;
    border-radius: 8px;
    border: 1px solid #ccc;
  }

  .partner-form .form-group.full textarea {
    min-height: 150px;
  }

  /* SUBMIT BUTTON */
  .partner-form .submit-btn {
    font-size: 1.6rem;
    padding: 1rem 3rem;
    border-radius: 25px;
    margin-top: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
  }

  .partner-form .submit-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
  }

  /* Close spacing between sections */
  .section {
    margin-top: 2rem;   /* smaller gap above */
    margin-bottom: 2rem; /* smaller gap below */
  }

}