* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", Arial, sans-serif;
}

body {
  background: #0f2027;
  color: #e0e0e0;
}

/* LOGO */
.brand-header {
  height: 38vh;
  min-height: 260px;
  background:
    linear-gradient(rgba(15,32,39,0.85), rgba(44,83,100,0.85)),
    url("LOGO.jpg") center/contain no-repeat;
}

/* NAV */
.main-nav {
  display: flex;
  justify-content: center;
  gap: 30px;
  padding: 14px 0;
  background: #000;
}

.main-nav button {
  background: none;
  border: none;
  color: #fff;
  font-size: 16px;
  cursor: pointer;
  padding-bottom: 5px;
}

.main-nav button.active {
  border-bottom: 2px solid #4fc3f7;
}

/* CONTENT */
.content-area {
  padding: 60px 10%;
  background: linear-gradient(180deg, #0f2027, #203a43);
}

.page {
  display: none;
}

.page.active {
  display: block;
}

.page h1 {
  color: #4fc3f7;
  margin-bottom: 25px;
}

/* CARDS */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 25px;
}

.card {
  background: #162c35;
  padding: 25px;
  border-radius: 14px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.4);
}

.card h3 {
  color: #4fc3f7;
  margin-bottom: 10px;
}

.highlight-card {
  border: 1px solid #4fc3f7;
}

/* POPUP */
#popup {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  justify-content: center;
  align-items: center;
}

#popup.show {
  display: flex;
}

.popup-content {
  background: linear-gradient(135deg, #4fc3f7, #1976d2);
  padding: 30px;
  border-radius: 16px;
  width: 380px;
  color: #fff;
  position: relative;
}

.popup-content input,
.popup-content select,
.popup-content textarea {
  width: 100%;
  padding: 10px;
  margin-bottom: 12px;
  border-radius: 6px;
  border: none;
}

.submit-btn {
  width: 100%;
  padding: 12px;
  background: #fff;
  color: #1976d2;
  border: none;
  border-radius: 6px;
  font-weight: bold;
  cursor: pointer;
}

.close-btn {
  position: absolute;
  top: 12px;
  right: 15px;
  cursor: pointer;
}