@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+Bengali:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600;700&family=Plus+Jakarta+Sans:wght@300;400;500;600;700&family=Rajdhani:wght@300;400;500;600;700&family=Hind+Siliguri:wght@300;400;500;600;700&display=swap');

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.mechalogy-header {
  position: relative;
  width: 100%;
  background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 50%, #e2e8f0 100%);
  overflow: hidden;
  font-family: 'Inter', 'Plus Jakarta Sans', sans-serif;
}

.mechalogy-header-container {
  position: relative;
  width: 100%;
  min-height: 300px;
  padding: 20px;
}

.header-grid-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.4;
  background-image: 
    linear-gradient(to right, #e2e8f0 1px, transparent 1px),
    linear-gradient(to bottom, #e2e8f0 1px, transparent 1px),
    linear-gradient(to right, #cbd5e1 1px, transparent 1px),
    linear-gradient(to bottom, #cbd5e1 1px, transparent 1px);
  background-size: 100px 100px, 100px 100px, 20px 20px, 20px 20px;
}

.header-particles {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: #94a3b8;
  border-radius: 50%;
  opacity: 0;
  animation: floatParticle 15s infinite ease-in-out;
}

@keyframes floatParticle {
  0%, 100% { opacity: 0; transform: translateY(0); }
  50% { opacity: 0.4; transform: translateY(-80px); }
}

.header-gears {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.header-gears svg {
  width: 100%;
  height: 100%;
  opacity: 0.08;
}

.gear-group-1 {
  animation: rotateGear 30s linear infinite;
  transform-origin: 10% 20%;
}

.gear-group-2 {
  animation: rotateGearReverse 40s linear infinite;
  transform-origin: 85% 70%;
}

.gear-group-3 {
  animation: rotateGear 25s linear infinite;
  transform-origin: 50% 10%;
}

@keyframes rotateGear {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes rotateGearReverse {
  from { transform: rotate(0deg); }
  to { transform: rotate(-360deg); }
}

.header-content {
  position: relative;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 20px 60px;
  max-width: 1400px;
  margin: 0 auto;
}

.header-left {
  flex: 0 0 auto;
  min-width: 280px;
}

.header-date {
  font-family: 'Noto Sans Bengali', 'Hind Siliguri', sans-serif;
  font-size: 1.1rem;
  font-weight: 500;
  color: #334155;
  margin-bottom: 4px;
  text-align: left;
}

.header-day {
  font-family: 'Noto Sans Bengali', 'Hind Siliguri', sans-serif;
  font-size: 0.9rem;
  font-weight: 400;
  color: #0ea5e9;
  margin-bottom: 20px;
  text-align: left;
}

.brand-container {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 20px;
}

.brand-logo {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  padding: 3px;
  background: linear-gradient(135deg, #f472b6, #a78bfa, #38bdf8);
  animation: logoPulse 3s ease-in-out infinite;
}

.brand-logo img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  background: white;
}

@keyframes logoPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(244, 114, 182, 0.4); }
  50% { box-shadow: 0 0 20px 5px rgba(244, 114, 182, 0.2); }
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-family: 'Noto Sans Bengali', 'Hind Siliguri', sans-serif;
  font-size: 4rem;
  font-weight: 700;
  color: #1e293b;
  line-height: 1.1;
  letter-spacing: -1px;
}

.brand-tagline {
  font-family: 'Rajdhani', 'Plus Jakarta Sans', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  color: #0369a1;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-top: 8px;
}

.header-right {
  flex: 0 0 auto;
  display: flex;
  justify-content: flex-end;
  align-items: flex-end;
}

.books-container {
  position: relative;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  perspective: 1000px;
  width: 480px;
  height: 260px;
}

.book-card {
  position: absolute;
  width: 130px;
  height: 170px;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
  transition: transform 0.4s ease, box-shadow 0.4s ease, z-index 0.1s;
}

.book-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Carrier book - leftmost, highest, 10 degrees left */
.book-card.book-carrier {
  right: 400px;
  bottom: 120px;
  transform: rotate(-10deg);
  z-index: 1;
  animation: floatBook1 6s ease-in-out infinite;
}

/* Viva book - 7 degrees left */
.book-card.book-viva {
  right: 310px;
  bottom: 90px;
  transform: rotate(-7deg);
  z-index: 2;
  animation: floatBook2 6s ease-in-out infinite 0.5s;
}

/* Job solution book - 4 degrees left */
.book-card.book-job {
  right: 220px;
  bottom: 60px;
  transform: rotate(-4deg);
  z-index: 3;
  animation: floatBook3 6s ease-in-out infinite 1s;
}

/* MCQ book - 2 degrees left */
.book-card.book-mcq {
  right: 120px;
  bottom: 30px;
  transform: rotate(-2deg);
  z-index: 4;
  animation: floatBook4 6s ease-in-out infinite 1.5s;
}

/* Written book - rightmost, front, lowest */
.book-card.book-written {
  right: 20px;
  bottom: 0;
  transform: rotate(0deg);
  z-index: 5;
  animation: floatBook5 6s ease-in-out infinite 2s;
}

.book-card:hover {
  transform: scale(1.08) translateY(-10px) !important;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.25);
  z-index: 10 !important;
}

@keyframes floatBook1 {
  0%, 100% { transform: rotate(-10deg) translateY(0); }
  50% { transform: rotate(-10deg) translateY(-6px); }
}

@keyframes floatBook2 {
  0%, 100% { transform: rotate(-7deg) translateY(0); }
  50% { transform: rotate(-7deg) translateY(-6px); }
}

@keyframes floatBook3 {
  0%, 100% { transform: rotate(-4deg) translateY(0); }
  50% { transform: rotate(-4deg) translateY(-6px); }
}

@keyframes floatBook4 {
  0%, 100% { transform: rotate(-2deg) translateY(0); }
  50% { transform: rotate(-2deg) translateY(-6px); }
}

@keyframes floatBook5 {
  0%, 100% { transform: rotate(0deg) translateY(0); }
  50% { transform: rotate(0deg) translateY(-6px); }
}

.header-nav {
  position: relative;
  z-index: 10;
  background: white;
  border-top: 1px solid #e2e8f0;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.nav-container {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 40px;
  padding: 16px 20px;
  max-width: 1200px;
  margin: 0 auto;
  flex-wrap: wrap;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: #475569;
  font-family: 'Inter', 'Plus Jakarta Sans', sans-serif;
  font-size: 1rem;
  font-weight: 500;
  padding: 10px 20px;
  border-radius: 8px;
  transition: all 0.3s ease;
}

.nav-link:hover {
  color: #0284c7;
  background: #f0f9ff;
}

.nav-link svg {
  width: 20px;
  height: 20px;
}

@media (max-width: 1024px) {
  .header-content {
    padding: 20px 30px;
    transform: scale(0.85);
    transform-origin: top center;
  }
}

@media (max-width: 768px) {
  .mechalogy-header-container {
    min-height: auto;
    padding: 10px;
  }
  
  .header-content {
    transform: scale(0.65);
    transform-origin: top center;
    padding: 15px;
    margin-bottom: -80px;
  }
  
  .nav-container {
    gap: 20px;
    padding: 12px 15px;
  }
  
  .nav-link {
    font-size: 0.9rem;
    padding: 8px 12px;
  }
}

@media (max-width: 480px) {
  .header-content {
    transform: scale(0.45);
    transform-origin: top center;
    margin-bottom: -150px;
  }
  
  .nav-container {
    gap: 10px;
    padding: 10px;
  }
  
  .nav-link {
    font-size: 0.8rem;
    padding: 6px 10px;
  }
  
  .nav-link span {
    display: none;
  }
  
  .nav-link svg {
    width: 22px;
    height: 22px;
  }
}