/* ===== RESET & BASE ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.7;
  color: #1f2937;
  background: linear-gradient(-45deg, #0f172a, #1e293b, #0f766e, #022c22);
  background-size: 400% 400%;
  animation: gradientBG 15s ease infinite;
}

/* Dynamic background */
@keyframes gradientBG {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

img {
  max-width: 100%;
  display: block;
}

/* ===== HEADER ===== */
header {
  background: rgba(255, 255, 255, 0.96);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

header .logo img {
  height: 55px;
}

header nav ul {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  list-style: none;
  padding: 1rem;
}

header nav a {
  text-decoration: none;
  font-weight: 600;
  color: #0f172a;
  transition: color .3s;
}

header nav a:hover {
  color: #0f766e;
}

/* ===== SECTIONS ===== */
section {
  padding: 4rem 1.2rem;
  max-width: 1200px;
  margin: auto;
}

section h2 {
  text-align: center;
  font-size: 2.4rem;
  margin-bottom: 1rem;
  color: #ffffff;
}

.section-intro {
  max-width: 800px;
  margin: auto;
  text-align: center;
  color: #e5e7eb;
  margin-bottom: 3rem;
}

/* ===== CARDS ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.card {
  background: #ffffff;
  border-radius: 14px;
  padding: 2rem;
  box-shadow: 0 15px 35px rgba(0,0,0,0.15);
  transition: transform .3s, box-shadow .3s;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 45px rgba(0,0,0,0.2);
}

.card h3 {
  color: #0f766e;
  margin-bottom: .6rem;
}

/* ===== TESTIMONIALS ===== */
.testimonial img {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  margin-bottom: 1rem;
}

.testimonial p {
  font-style: italic;
  margin-bottom: .8rem;
}

/* ===== PROJECTS ===== */
.project img {
  border-radius: 10px;
  margin-bottom: 1rem;
}

/* ===== BUTTON ===== */
.btn {
  display: inline-block;
  margin-top: 2.5rem;
  padding: .9rem 2.2rem;
  background: #0f766e;
  color: #ffffff;
  border-radius: 30px;
  font-weight: bold;
  text-decoration: none;
  transition: background .3s;
}

.btn:hover {
  background: #115e59;
}

/* ===== FOOTER ===== */
footer {
  background: #020617;
  color: #9ca3af;
  text-align: center;
  padding: 2rem 1rem;
}

footer a {
  color: #5eead4;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  header nav ul {
    flex-wrap: wrap;
    gap: 1rem;
  }

  section h2 {
    font-size: 2rem;
  }
}

#lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.9);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

#lightbox.show {
  display: flex;
}

#lightbox img {
  max-width: 90%;
  max-height: 90%;
  border-radius: 12px;
}

.whatsapp-float {
  position: fixed;
  bottom: 90px;
  right: 20px;
  background: #25d366;
  color: #fff;
  font-size: 26px;
  padding: 14px 16px;
  border-radius: 50%;
  box-shadow: 0 8px 20px rgba(0,0,0,.3);
  z-index: 999;
}

.call-float {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: #0f766e;
  color: white;
  font-size: 26px;
  padding: 14px 16px;
  border-radius: 50%;
  z-index: 999;
}