@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Outfit:wght@500;600;700;800&display=swap');

:root {
  /* Premium vibrant color palette */
  --color-white: #ffffff;
  --color-light-blue: #f0f8ff;
  --color-soft-grey: #f8f9fa;
  --color-dark-grey: #6b7280;
  --color-dark-blue: #111827;
  --color-accent-blue: #2563eb;
  --color-accent-blue-hover: #1d4ed8;
  --color-accent-glow: rgba(37, 99, 235, 0.4);
  
  --font-family-primary: 'Inter', system-ui, sans-serif;
  --font-family-heading: 'Outfit', sans-serif;
  
  --border-radius-sm: 8px;
  --border-radius-md: 16px;
  --border-radius-lg: 24px;
  --border-radius-xl: 32px;
  
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 10px 25px -3px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
  --shadow-glow: 0 0 25px var(--color-accent-glow);

  --transition-fast: 0.25s ease;
  --transition-smooth: 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  
  /* Glassmorphism helpers */
  --glass-bg: rgba(255, 255, 255, 0.75);
  --glass-border: 1px solid rgba(255, 255, 255, 0.5);
}

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

body {
  font-family: var(--font-family-primary);
  background-color: var(--color-soft-grey);
  
  /* Modern soft mesh gradient background */
  background-image: 
    radial-gradient(at 0% 0%, rgba(240,248,255,1) 0, transparent 40%), 
    radial-gradient(at 100% 0%, rgba(230,240,255,0.8) 0, transparent 50%),
    radial-gradient(at 100% 100%, rgba(255,255,255,1) 0, transparent 40%);
  background-attachment: fixed;
  color: var(--color-dark-blue);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-heading);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5em;
  color: var(--color-dark-blue);
}

p {
  color: var(--color-dark-grey);
  margin-bottom: 1em;
  font-size: 1.125rem;
  line-height: 1.7;
}

a {
  color: var(--color-accent-blue);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-blue-hover);
}

ul {
  list-style: none;
}

/* Layout */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 100px 0;
}

.section-light {
  background-color: transparent;
  position: relative;
  z-index: 2;
}

.section-soft {
  background-color: rgba(250, 250, 252, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: var(--glass-border);
  border-bottom: var(--glass-border);
}

.section-gradient {
  background: linear-gradient(135deg, rgba(255,255,255,0.7) 0%, rgba(240,248,255,0.85) 100%);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
}

.text-center {
  text-align: center;
}

/* Typography Enhancements */
.display-1 {
  font-size: clamp(3rem, 5vw, 4.8rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: 24px;
}

.display-2 {
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 16px 32px;
  border-radius: var(--border-radius-xl);
  font-size: 1.05rem;
  font-weight: 600;
  font-family: var(--font-family-primary);
  text-align: center;
  cursor: pointer;
  border: none;
  transition: all var(--transition-smooth);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-accent-blue), #1e40af);
  color: var(--color-white);
  box-shadow: 0 10px 20px -5px var(--color-accent-glow);
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 20px 30px -5px var(--color-accent-glow);
  color: var(--color-white);
}

.btn-secondary {
  background-color: rgba(0, 0, 0, 0.04);
  color: var(--color-dark-blue);
  border: var(--glass-border);
}

.btn-secondary:hover {
  background-color: rgba(0, 0, 0, 0.08);
  color: var(--color-dark-blue);
  transform: translateY(-2px);
}

/* Navbar (Glassmorphism) */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 70px;
  background-color: rgba(255, 255, 255, 0.65);
  backdrop-filter: saturate(180%) blur(25px);
  -webkit-backdrop-filter: saturate(180%) blur(25px);
  border-bottom: var(--glass-border);
  display: flex;
  align-items: center;
  z-index: 1000;
  transition: background-color var(--transition-fast);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar-brand {
  font-family: var(--font-family-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-dark-blue);
  display: flex;
  align-items: center;
  gap: 12px;
}

.navbar-brand img {
  height: 48px;
  border-radius: 12px;
}

.navbar-nav {
  display: flex;
  gap: 32px;
  flex-grow: 1;
  justify-content: center;
  align-items: center;
}

.nav-link {
  font-size: 0.95rem;
  color: var(--color-dark-blue);
  opacity: 0.85;
  text-decoration: none;
  font-weight: 500;
  padding: 8px 18px;
  border-radius: 20px;
  transition: all var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  background-color: var(--color-dark-blue);
  color: var(--color-white);
  opacity: 1;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
}

/* Footer */
.footer {
  background-color: rgba(245, 245, 247, 0.8);
  backdrop-filter: blur(20px);
  padding: 80px 0 40px;
  border-top: var(--glass-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 50px;
  margin-bottom: 50px;
}

.footer-col h4 {
  font-family: var(--font-family-heading);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--color-dark-blue);
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.footer-col a {
  color: var(--color-dark-grey);
  font-size: 0.95rem;
  font-weight: 500;
}

.footer-col a:hover {
  color: var(--color-accent-blue);
}

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(0, 0, 0, 0.05);
  color: var(--color-dark-grey);
  font-size: 0.9rem;
}

/* 
==============================================
   ADVANCED SCROLL ANIMATIONS
==============================================
*/

/* Base state for all animated elements */
.animate-fade-up, .animate-zoom-in, .animate-slide-left, .animate-slide-right {
  opacity: 0;
  will-change: opacity, transform;
  /* Use a nice spring-like easing */
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Specific start states */
.animate-fade-up {
  transform: translateY(40px);
}

.animate-zoom-in {
  transform: scale(0.9) translateY(20px);
}

.animate-slide-right {
  transform: translateX(-40px);
}

.animate-slide-left {
  transform: translateX(40px);
}

/* Visible (end) state triggered by JS */
.animate-fade-up.is-visible,
.animate-zoom-in.is-visible,
.animate-slide-left.is-visible,
.animate-slide-right.is-visible,
.fade-in-section.is-visible /* Fallback */ {
  opacity: 1;
  transform: translate(0) scale(1);
}

/* Fallback for old elements */
.fade-in-section {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

/* Stagger Delays */
.delay-100 { transition-delay: 100ms; }
.delay-200 { transition-delay: 200ms; }
.delay-300 { transition-delay: 300ms; }
.delay-400 { transition-delay: 400ms; }
.delay-500 { transition-delay: 500ms; }


/* Floating Buttons */
@keyframes reflective-sweep {
  0% { transform: translateX(-100%) skewX(-15deg); }
  50%, 100% { transform: translateX(200%) skewX(-15deg); }
}

.floating-btn {
  position: fixed;
  z-index: 900;
  box-shadow: var(--shadow-lg);
  padding: 16px 26px;
  border-radius: var(--border-radius-xl);
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  font-family: var(--font-family-primary);
  font-size: 1.05rem;
  transition: transform var(--transition-smooth), box-shadow var(--transition-fast);
  animation: float-base-in 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  opacity: 0;
  border: var(--glass-border);
  cursor: pointer;
  overflow: hidden;
}

.floating-btn.attractive-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 50%;
  background: linear-gradient(to right, rgba(255,255,255,0) 0%, rgba(255,255,255,0.4) 50%, rgba(255,255,255,0) 100%);
  transform: skewX(-15deg) translateX(-100%);
  animation: reflective-sweep 4s infinite;
}

@keyframes float-base-in {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.floating-btn:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
}

.collapsible-btn {
  max-width: 58px;
  padding: 16px;
  white-space: nowrap;
  transition: max-width 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

.collapsible-btn .btn-text {
  opacity: 0;
  max-width: 0;
  overflow: hidden;
  transition: opacity 0.3s ease, max-width 0.4s ease;
}

.collapsible-btn:hover {
  max-width: 220px;
}

.collapsible-btn:hover .btn-text {
  opacity: 1;
  max-width: 120px;
}

.floating-btn-student {
  bottom: 30px;
  right: 30px;
  background: linear-gradient(135deg, var(--color-accent-blue), #1e40af);
  color: var(--color-white);
}

.floating-btn-teacher {
  bottom: 30px;
  left: 30px;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  color: var(--color-dark-blue);
  box-shadow: var(--shadow-md);
}

.floating-btn-whyus {
  top: 95px;
  right: 30px;
  background: linear-gradient(135deg, #f59e0b, #ef4444);
  color: var(--color-white);
  border: none;
  box-shadow: 0 10px 30px rgba(239, 68, 68, 0.4);
}

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(17, 24, 39, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1050;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), visibility var(--transition-fast);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background-color: var(--color-white);
  padding: 50px;
  border-radius: var(--border-radius-lg);
  width: 90%;
  max-width: 550px;
  box-shadow: var(--shadow-lg);
  transform: scale(0.95) translateY(20px);
  transition: transform var(--transition-smooth);
  position: relative;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-overlay.active .modal-content {
  transform: scale(1) translateY(0);
}

.modal-close {
  position: absolute;
  top: 25px;
  right: 25px;
  background: rgba(0,0,0,0.05);
  border: none;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  color: var(--color-dark-grey);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: rgba(0,0,0,0.1);
  color: var(--color-dark-blue);
  transform: rotate(90deg);
}

/* Forms */
.form-group {
  margin-bottom: 24px;
}

.form-label {
  display: block;
  font-family: var(--font-family-primary);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--color-dark-blue);
}

.form-control {
  width: 100%;
  padding: 14px 18px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: var(--border-radius-md);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
  background-color: rgba(248, 249, 250, 0.8);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-accent-blue);
  background-color: var(--color-white);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

textarea.form-control {
  resize: vertical;
  min-height: 120px;
}

/* Cards & Grid Systems (Glassmorphism integration) */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 50px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 35px;
}

.card {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: var(--glass-border);
  border-radius: var(--border-radius-lg);
  padding: 45px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
  height: 100%;
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-md);
  border-color: rgba(255,255,255,0.8);
}

.card-icon {
  font-size: 3rem;
  margin-bottom: 24px;
  display: inline-block;
  padding: 15px;
  background: rgba(37, 99, 235, 0.05);
  border-radius: var(--border-radius-md);
  color: var(--color-accent-blue);
}

/* Accordion Styles (FAQ Page) */
.faq-accordion .accordion-item {
  background: var(--glass-bg);
  border-radius: var(--border-radius-lg);
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  border: var(--glass-border);
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.faq-accordion .accordion-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.faq-accordion .accordion-header {
  padding: 24px 30px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 700;
  font-family: var(--font-family-heading);
  font-size: 1.25rem;
  color: var(--color-dark-blue);
  background: transparent;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.faq-accordion .accordion-header:hover {
  background: rgba(0,0,0,0.02);
}

.faq-accordion .accordion-item.active .accordion-header {
  color: var(--color-accent-blue);
  background: rgba(37, 99, 235, 0.04);
}

.faq-accordion .accordion-header svg {
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  color: var(--color-dark-grey);
}

.faq-accordion .accordion-item.active .accordion-header svg {
  transform: rotate(180deg);
  color: var(--color-accent-blue);
}

.faq-accordion .accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.6s cubic-bezier(0.16, 1, 0.3, 1), padding 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  background: transparent;
}

.faq-accordion .accordion-item.active .accordion-content {
  padding: 0 30px 24px 30px;
  max-height: 800px;
}

/* Checkbox Groups */
.checkbox-group {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 14px;
  margin-top: 12px;
  padding: 18px;
  background-color: rgba(255,255,255,0.5);
  border-radius: var(--border-radius-md);
  border: 1px solid rgba(0, 0, 0, 0.05);
}

.checkbox-item {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-dark-blue);
  user-select: none;
}

.checkbox-item input[type="checkbox"] {
  width: 20px;
  height: 20px;
  cursor: pointer;
  accent-color: var(--color-accent-blue);
  border-radius: 4px;
}

/* Form Disclaimers */
.form-disclaimer {
  margin-top: 30px;
  margin-bottom: 25px;
  padding: 20px;
  background-color: rgba(37, 99, 235, 0.04);
  border-radius: var(--border-radius-md);
  border: 1px solid rgba(37, 99, 235, 0.1);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.disclaimer-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--color-dark-grey);
  line-height: 1.5;
  user-select: none;
}

.disclaimer-item input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin-top: 2px;
  cursor: pointer;
  accent-color: var(--color-accent-blue);
  flex-shrink: 0;
}

.disclaimer-item:hover {
  color: var(--color-dark-blue);
}

.btn:disabled {
  background: #e5e7eb !important;
  color: #9ca3af !important;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

/* WhatsApp Icon Enhancements */
.whatsapp-float {
  position: fixed;
  width: 64px;
  height: 64px;
  top: 50%;
  transform: translateY(-50%);
  right: 30px;
  background-color: #25d366;
  color: #FFF;
  border-radius: 50%;
  box-shadow: 0 10px 20px rgba(37, 211, 102, 0.3);
  z-index: 950;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-smooth);
}

.whatsapp-float:hover {
  background-color: #128c7e;
  transform: translateY(-50%) scale(1.1);
  box-shadow: 0 15px 30px rgba(37, 211, 102, 0.4);
}

.whatsapp-float svg {
  width: 38px;
  height: 38px;
  fill: currentColor;
}


/* Responsive */
@media (max-width: 768px) {
  .navbar-nav {
    display: none; 
  }
  
  .mobile-menu-btn {
    display: block;
  }
  
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .section {
    padding: 70px 0;
  }
  
  .floating-btn {
    bottom: 20px;
    padding: 12px 20px;
    font-size: 0.95rem;
  }
  
  .floating-btn-student {
    right: 20px;
  }

  .floating-btn-teacher {
    left: 20px;
  }
  
  .floating-btn-whyus {
    top: 80px;
    right: 20px;
    bottom: auto;
  }
  
  .whatsapp-float {
    width: 54px;
    height: 54px;
    right: 20px;
  }
  
  .whatsapp-float svg {
    width: 32px;
    height: 32px;
  }
  
  .navbar-nav.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(25px);
    padding: 25px;
    box-shadow: var(--shadow-md);
    gap: 24px;
    text-align: center;
  }
}