/* ==========================================================
   1.  GOOGLE FONTS  (works even if one URL is unreachable)
   ========================================================== */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;700&family=Inter:wght@300;400;500;600&display=swap');

/* ==========================================================
   2.  GLOBAL / RESET
   ========================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Poppins', 'Inter', sans-serif;
  color: #444;
  line-height: 1.5;
}

/* ==========================================================
   3.  HERO SECTION (#hero)
   ========================================================== */
#hero {
  position: relative;
  height: 100vh;
  background-color: #212529;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

#particles-js {
  position: absolute;
  inset: 0;
  z-index: 0;
}

#hero .container {
  z-index: 1;
  text-align: center;
}

#hero .btn-primary {
  background-color: #0d6efd;
  border-color: #0d6efd;
  transition: background-color 0.3s, transform 0.3s;
}

#hero .btn-primary:hover {
  background-color: #0b5ed7;
  border-color: #0a58ca;
  transform: translateY(-3px);
}

/* Scroll-down arrow (no absolute positioning) */
.scroll-down {
  margin-top: 2.5rem;
}

.scroll-down a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 2rem;
  display: inline-block;
  animation: bounce 2s infinite;
  transition: color 0.3s;
}

.scroll-down a:hover {
  color: #ffffff;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
  40% { transform: translateY(-20px); }
  60% { transform: translateY(-10px); }
}

/* ==========================================================
   4.  INSTALLATION TIMELINE
   ========================================================== */
.timeline {
  position: relative;
  padding-left: 4rem;
  margin: 0;
  border-left: 3px solid #0d6efd;
  list-style: none;
}

.timeline li {
  position: relative;
  margin-bottom: 3rem;
}

.timeline li:last-child {
  margin-bottom: 0;
}

.timeline-icon {
  position: absolute;
  left: -42px;
  top: 0;
  width: 50px;
  height: 50px;
  background: #0d6efd;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  border: 3px solid #ffffff;
}

.timeline-content {
  background: #ffffff;
  padding: 1.5rem;
  border-radius: 8px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

.timeline-content h3 {
  font-weight: 600;
  margin-top: 0;
}

.timeline-content code {
  background-color: #e9ecef;
  padding: 0.2em 0.4em;
  border-radius: 3px;
  font-size: 85%;
}

/* ==========================================================
   5.  CERTIFICATE STYLES (landscape, fully-contained)
   ========================================================== */
.certificate-wrapper {
  width: 100%;
  max-width: 1050px;
  margin: auto;
  text-align: center;
}

.certificate {
  position: relative;
  width: 100%;
  aspect-ratio: 1.414 / 1;       /* A4 landscape ratio */
  max-height: 90vh;
  background: #ffffff;
  border-radius: 20px;
  padding: clamp(30px, 4vw, 60px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
  border: 3px solid transparent;
  background-clip: padding-box;
}

/* animated rainbow border */
.certificate::before {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 20px;
  background: linear-gradient(45deg, #ff6b6b, #feca57, #48dbfb, #ff9ff3, #54a0ff);
  background-size: 400% 400%;
  z-index: -1;
  animation: gradientShift 8s ease infinite;
}

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

/* dashed inner frame */
.certificate::after {
  content: '';
  position: absolute;
  inset: 20px;
  border: 2px dashed rgba(102, 126, 234, 0.3);
  border-radius: 15px;
  pointer-events: none;
}

/* header */
.cert-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.trophy {
  font-size: clamp(40px, 6vw, 70px);
  animation: bounce 2s ease-in-out infinite;
  cursor: pointer;
  user-select: none;
}

h1 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 700;
  background: linear-gradient(45deg, #667eea, #764ba2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* content */
.subtitle {
  font-size: clamp(15px, 2.5vw, 18px);
  color: #6c757d;
  font-style: italic;
  margin: 10px 0;
}

.recipient {
  font-family: 'Playfair Display', serif;
  font-size: clamp(28px, 5vw, 48px);
  font-weight: 700;
  background: linear-gradient(45deg, #ff6b6b, #feca57);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 10px 0 20px;
}

.main-text {
  font-size: clamp(14px, 2vw, 16px);
  line-height: 1.6;
  color: #495057;
  max-width: 90%;
  margin: 0 auto 20px;
}

.award-text {
  font-size: clamp(14px, 2vw, 18px);
  margin-bottom: 20px;
}
.award-text strong {
  font-family: 'Playfair Display', serif;
  color: #ffc107;
}

/* footer */
.cert-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: auto;
  padding-top: 15px;
}

.signature-block,
.seal-block {
  flex: 1 1 200px;
  max-width: 100%;
}

.signature-img {
  height: 35px;
  width: auto;
  max-width: 100%;
  object-fit: contain;
  display: block;
  margin: 0 auto 5px;
}

.signatory {
  font-weight: 600;
  font-size: clamp(14px, 2vw, 16px);
  color: #343a40;
}

.role {
  font-size: clamp(11px, 1.5vw, 13px);
  color: #6c757d;
  font-style: italic;
}

.seal-img {
  width: clamp(70px, 10vw, 100px);
  height: clamp(70px, 10vw, 100px);
  object-fit: contain;
  border-radius: 50%;
  box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
}

/* button */
.download-btn {
  margin-top: 30px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #ffffff;
  border: none;
  padding: 15px 35px;
  font-size: clamp(15px, 2.2vw, 18px);
  border-radius: 50px;
  cursor: pointer;
  transition: transform 0.3s, box-shadow 0.3s;
}

.download-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(102, 126, 234, 0.4);
}

/* easter egg rainbow */
.certificate.konami {
  animation: rainbow 2s linear infinite;
}
@keyframes rainbow {
  0% { filter: hue-rotate(0deg); }
  100% { filter: hue-rotate(360deg); }
}

/* sparkle animation (for JS) */
@keyframes sparkleFloat {
  0% { opacity: 1; transform: translateY(0) rotate(0deg); }
  100% { opacity: 0; transform: translateY(-100px) rotate(360deg); }
}

/* responsive tweak */
@media (max-width: 600px) {
  .cert-footer {
    flex-direction: column;
    gap: 30px;
  }
}