:root {
  --dark-grey: #1b1b32;
  --light-grey: #f1f1f1;
  --neon: #00ffcc;
  --card-bg: #1e1e1e;
}

/* -----------------------------------------
   NAVBAR  (unchanged)
----------------------------------------- */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 10vh;
  border-top: 1px solid rgb(8, 212, 248);
  border-bottom: 1px solid rgb(6, 213, 250);
  background-color: rgb(15, 49, 77);
  font-weight: bold;
  z-index: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 60px;
}

#navbar a {
  color: #e9e1f1;
  text-decoration: none;
}
#navbar a:hover {
  color: #dd78fc;
}

/* -----------------------------------------
   MAIN LAYOUT — match project grid
----------------------------------------- */

.flex-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px 20px;
  padding: 2rem;
  margin-top: 8vh; /* avoids overlap under navbar */
  margin-bottom: -5vh;
  align-items: stretch;
  background-image: linear-gradient(76deg, #1d3c5e 0%, #181719 100%);
}

/* -----------------------------------------
   CARD STYLE — match project card theme
----------------------------------------- */

.card {
  background-color: var(--card-bg);
  border: 2px solid var(--neon);
  border-radius: 10px;
  padding: 1.5rem;
  text-align: center;
  color: var(--neon);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  overflow: hidden;
  min-height: 150px; 
}

.card:hover {
  transform: scale(1.05);
  box-shadow: 0 0 12px #0ffcf0;
}

/* Card title */
.card-title {
  color: wheat;
  border-bottom: 2px solid var(--neon);
  width: fit-content;
  margin: 0 auto 0.5rem auto;
  padding-bottom: 0.3rem;
  font-weight: bold;
}

/* Card main image */
.card-img {
  width: 100%;
  max-height: 200px;
  object-fit: contain;
  border-radius: 6px;
}

/* -----------------------------------------
   TOGGLE SECTION (certificate viewer)
----------------------------------------- */
#toggle-container {
  background: rgba(0, 255, 204, 0.08);
  border: 1px solid var(--neon);
  border-radius: 10px;
  padding: 1rem;
  margin-top: 1rem;
  width: 100%;
  box-shadow: 0 0 10px rgba(0, 255, 204, 0.2);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

#toggle-container:hover {
  box-shadow: 0 0 14px rgba(0, 255, 204, 0.35);
  transform: scale(1.02);
}

#toggle-button {
  padding: 10px 20px;
  border: 2px solid var(--neon);
  background: transparent;
  color: var(--neon);
  border-radius: 6px;
  cursor: pointer;
  font-weight: bold;
  transition: background 0.3s ease, transform 0.2s ease;
}

#toggle-button:hover {
  background: var(--neon);
  color: #1e1e1e;
  transform: scale(1.05);
}

#toggle-container img {
  width: 100%;
  max-height: 350px;
  object-fit: contain;
  margin-top: 1rem;
  border-radius: 6px;
}

/* -----------------------------------------
   RESPONSIVE
----------------------------------------- */
@media (min-width: 768px) {
  .card {
    max-width: 100%;
  }
}

footer {
  text-align: center;
  padding: 2rem;
  background: #111;
  color: #eee;
  margin-top: 2rem;
}

body.dark .flex-container {
  background: #222;
}

body.dark .card {
  background: #0b2f311e;
}

body.dark #toggle-button {
  background: #22404254;
}

body.dark #toggle-container {
  background: #011c204f;
}

body.dark #toggle-button:hover {
  background: #54f8a6ee;
}