:root {
  --bg-color-1: #4b79a1;
  --bg-color-2: #283e51;
  --text-color: #f0fdfc;
  --button-color-1: #3498db;
  --button-color-2: #2c3e50;
  --sidebar-bg: rgba(255, 255, 255, 0.2);
  --chat-bg: rgba(255, 255, 255, 0.5);
  --edge-space: clamp(24px, 6vh, 80px);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Poppins', 'Montserrat', Arial, sans-serif;
  color: var(--text-color);
  background: linear-gradient(135deg, var(--bg-color-1) 0%, var(--bg-color-2) 100%);
  min-height: 100vh;
  overflow-x: hidden;
  animation: backgroundShift 20s infinite alternate;
}

#bg-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}

@keyframes backgroundShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.header {
  display: grid;
  place-items: center;
  gap: 8px;
  padding: 18px 16px 0 16px;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 5;
}

.back-btn {
  position: absolute;
  left: 22px;
  top: 22px;
  text-decoration: none;
  color: #ffffff;
  background: var(--sidebar-bg);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 10px;
  padding: 8px 14px;
  font-weight: 600;
  transition: all 0.3s ease;
}

.back-btn:hover { background: rgba(255,255,255,0.3); transform: scale(1.03); }

.title { font-size: 2.1rem; letter-spacing: 2px; text-shadow: 0 3px 15px rgba(0,0,0,0.5); }
.subtitle { margin-top: 4px; opacity: 0.95; text-align: center; }

.main {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--edge-space) 20px;
  box-sizing: border-box;
}

.glass.card {
  width: min(1000px, 92vw);
  max-height: 88vh;
  background: var(--chat-bg);
  backdrop-filter: blur(12px);
  border-radius: 22px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.35);
  padding: 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.certificate-wrap { position: relative; }
.certificate {
  width: auto;
  height: auto;
  max-width: 90%;
  max-height: 60vh;
  object-fit: contain;
  border-radius: 16px;
  border: 4px solid rgba(255,255,255,0.85);
  box-shadow: 0 16px 40px rgba(0,0,0,0.35);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  cursor: zoom-in;
}
.certificate:hover { transform: scale(1.01); box-shadow: 0 24px 60px rgba(0,0,0,0.4); }

.zoom-hint {
  position: absolute;
  bottom: 10px;
  right: 12px;
  background: rgba(0,0,0,0.35);
  color: #fff;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 0.85rem;
}

.verified-wrap { margin-top: 18px; display: flex; align-items: center; justify-content: center; gap: 10px; }
.verified-text { color: #ffffff; font-weight: 600; }
.verified-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--button-color-1), var(--button-color-2));
  box-shadow: 0 0 18px rgba(52, 152, 219, 0.8), 0 0 30px rgba(44, 62, 80, 0.6);
  color: #fff;
  text-shadow: 0 0 6px rgba(255,255,255,0.7);
  cursor: default;
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}
.verified-badge:hover { box-shadow: 0 0 25px rgba(52,152,219,1), 0 0 40px rgba(44,62,80,0.9); transform: scale(1.06); }

.footer { text-align: center; padding: 12px; color: #ffffff; opacity: 0.9; position: absolute; bottom: 8px; left: 0; width: 100%; z-index: 5; }
.disclaimer { max-width: 920px; margin: 0 auto; }

/* Overlay zoom */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  backdrop-filter: blur(6px);
}
.overlay.show { display: flex; }
.overlay-img { max-width: 94vw; max-height: 90vh; border-radius: 16px; border: 4px solid rgba(255,255,255,0.9); box-shadow: 0 20px 70px rgba(0,0,0,0.6); }

/* Animations */
.animate { opacity: 0; transform: translateY(25px); animation: fadeInUp 0.7s ease-out forwards; }
.animate:nth-child(1) { animation-delay: 0.05s; }
.animate:nth-child(2) { animation-delay: 0.15s; }
.animate:nth-child(3) { animation-delay: 0.25s; }

@keyframes fadeInUp { from { opacity: 0; transform: translateY(25px); } to { opacity: 1; transform: translateY(0); } }

/* Responsive */
@media (max-width: 768px) {
  .title { font-size: 1.6rem; }
  .verified-text { font-size: 0.95rem; }
}