/* ==========================================================================
   Karsh Corporate Advisors - Global Stylesheet
   ========================================================================== */

/* Reset & Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  color: #333333;                   /* Richer text color for professional look */
  background-color: var(--color-light);
  line-height: 1.75;                /* Improved paragraph readability spacing */
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-dark);
  letter-spacing: -0.02em;          /* Modern editorial letter-spacing */
}

h1 { font-size: 3.25rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.6rem; }
h4 { font-size: 1.25rem; }

p {
  color: #495057;                   /* Premium Slate Grey instead of dull grey */
  margin-bottom: 1.25rem;
}

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Layout Containers */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.section {
  padding: var(--spacing-xxl) 0;
}

.section-dark {
  background: linear-gradient(135deg, #0d0d11 0%, #171721 100%); /* Premium dark navy/charcoal gradient */
  color: var(--color-light);
}

.section-dark h2, .section-dark h3 {
  color: var(--color-light);
}

.section-dark p {
  color: #a0aec0;
}

.section-grey {
  background: linear-gradient(180deg, #f8f9fa 0%, #f1f3f5 100%); /* Sophisticated light grey gradient */
}

/* Header & Navigation */
header.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  transition: padding var(--transition-normal), background-color var(--transition-normal);
}

header.site-header.scrolled {
  padding: 0;
  background-color: rgba(255, 255, 255, 0.96);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 84px;
  transition: height var(--transition-normal);
}

header.site-header.scrolled .nav-container {
  height: 68px;
}

/* Logo container styling */
.logo {
  display: flex;
  align-items: center;
  color: var(--color-dark);
  transition: opacity var(--transition-fast);
}

.logo:hover {
  opacity: 0.85;
}

.logo img {
  height: 60px;
  width: auto;
  display: block;
  transition: height var(--transition-normal);
}

header.site-header.scrolled .logo img {
  height: 48px;
}

.nav-menu {
  display: flex;
  list-style: none;
  align-items: center;
  gap: 2.25rem;
}

.nav-link {
  font-weight: 500;
  font-size: 0.95rem;
  color: #495057;
  position: relative;
  padding: 0.5rem 0;
  display: inline-flex;
  align-items: center;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transition: width var(--transition-normal);
}

.nav-link:hover {
  color: var(--color-accent);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-link.active {
  color: var(--color-primary);
  font-weight: 700;
}

/* Navigation CTA */
.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: var(--color-light);
  padding: 0.65rem 1.6rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9rem;
  box-shadow: 0 4px 15px rgba(222, 23, 103, 0.15);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.nav-cta:hover {
  color: var(--color-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-accent);
}

/* Hamburger Menu (Mobile) */
.hamburger {
  display: none;
  cursor: pointer;
  background: none;
  border: none;
  outline: none;
  padding: 0.5rem;
}

.hamburger span {
  display: block;
  width: 25px;
  height: 2px;
  background-color: var(--color-dark);
  margin: 5px 0;
  transition: var(--transition-normal);
}

/* Footer Styles */
.site-footer {
  background-color: #0b0b0e;
  color: var(--color-light);
  padding: var(--spacing-xxl) 0 var(--spacing-lg) 0;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xxl);
}

.footer-logo {
  color: var(--color-light);
  margin-bottom: var(--spacing-md);
  display: inline-block;
}

.footer-desc {
  color: #a0aec0;
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: var(--spacing-lg);
  max-width: 320px;
}

.footer-socials {
  display: flex;
  gap: 1rem;
}

.social-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  background-color: var(--color-dark-surface);
  border: 1px solid var(--color-grey-border-dark);
  color: var(--color-grey-light);
  transition: transform var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast);
}

.social-icon:hover {
  transform: translateY(-3px);
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-light);
}

.footer-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
  position: relative;
  padding-bottom: 0.5rem;
}

.footer-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background-color: var(--color-accent);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.75rem;
}

.footer-links a {
  color: var(--color-grey-light);
  font-size: 0.9rem;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-accent);
  padding-left: 5px;
}

.footer-contact-item {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
  font-size: 0.9rem;
  color: var(--color-grey-light);
}

.footer-contact-item svg {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: var(--color-accent);
}

.footer-bottom {
  border-top: 1px solid var(--color-grey-border-dark);
  padding-top: var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  font-size: 0.85rem;
  color: var(--color-grey-muted);
}

.footer-bottom-links {
  display: flex;
  gap: 1.5rem;
}

.footer-bottom-links a:hover {
  color: var(--color-light);
}

/* Utility Layouts */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--spacing-xl); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--spacing-xl); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--spacing-md); }
.text-center { text-align: center; }
.align-center { display: flex; align-items: center; }
.justify-between { display: flex; justify-content: space-between; }
.flex-column { display: flex; flex-direction: column; }
.mb-xs { margin-bottom: var(--spacing-xs); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

/* Responsive adjustments */
@media (max-width: 992px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  h1 { font-size: 2.25rem; }
  h2 { font-size: 1.75rem; }
  
  .section {
    padding: var(--spacing-xl) 0;
  }
  
  /* Mobile Navigation */
  .hamburger {
    display: block;
    z-index: 1001;
  }
  
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 320px;
    height: 100vh;
    background: rgba(18, 18, 18, 0.96);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-left: 1px solid rgba(255, 255, 255, 0.08);
    flex-direction: column;
    padding: 100px var(--spacing-xl) var(--spacing-xl) var(--spacing-xl);
    box-shadow: -10px 0 40px rgba(0, 0, 0, 0.5);
    transition: right 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    z-index: 999;
    overflow-y: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
  }
  
  .nav-menu::-webkit-scrollbar {
    display: none;
  }
  
  .nav-menu.active {
    right: 0;
  }
  
  .nav-link {
    font-size: 1.05rem;
    color: rgba(255, 255, 255, 0.85) !important;
    font-weight: 600;
    display: block;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  }
  
  .nav-link.active,
  .nav-link:hover {
    color: var(--color-accent) !important;
  }
  
  .nav-cta {
    margin-top: var(--spacing-lg);
    width: 100%;
  }
  
  /* Hamburger active state */
  .hamburger.active span {
    background-color: var(--color-light) !important;
  }
  
  .hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  
  .hamburger.active span:nth-child(2) {
    opacity: 0;
  }
  
  .hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* Floating WhatsApp Widget */
.whatsapp-widget {
  position: fixed;
  bottom: 24px;
  left: 24px;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background-color: #25d366;
  box-shadow: 0 4px 15px rgba(37, 211, 102, 0.3);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.whatsapp-widget:hover {
  transform: scale(1.1) translateY(-3px);
  box-shadow: 0 8px 25px rgba(37, 211, 102, 0.45);
}

.whatsapp-widget svg {
  width: 30px;
  height: 30px;
  fill: #ffffff;
}

.whatsapp-widget::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.4);
  animation: pulse-whatsapp 2s infinite;
  pointer-events: none;
}

@keyframes pulse-whatsapp {
  0% { box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.6); }
  70% { box-shadow: 0 0 0 15px rgba(37, 211, 102, 0); }
  100% { box-shadow: 0 0 0 0 rgba(37, 211, 102, 0); }
}

/* Mobile Bottom Tab Bar */
.mobile-tab-bar {
  display: none; /* Hidden on desktop */
}

@media (max-width: 768px) {
  body {
    padding-bottom: 80px; /* Ensure space for the sticky bottom bar */
  }

  .whatsapp-widget {
    display: none !important; /* Hide floating bubble on mobile since it's in bottom bar */
  }

  .mobile-tab-bar {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 68px;
    background-color: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid rgba(0, 0, 0, 0.07);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.05);
    z-index: 9999;
    justify-content: space-around;
    align-items: center;
    padding: 0 0.5rem;
  }

  .tab-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #718096;
    font-size: 0.72rem;
    font-family: var(--font-heading);
    font-weight: 600;
    gap: 0.25rem;
    transition: color var(--transition-fast);
    flex-grow: 1;
    height: 100%;
  }

  .tab-item svg {
    stroke-width: 2;
    transition: transform var(--transition-fast);
  }

  .tab-item:hover, .tab-item:focus {
    color: var(--color-primary);
  }

  .tab-item:hover svg {
    transform: translateY(-2px);
  }

  .tab-whatsapp {
    position: relative;
    top: -10px; /* Raised app-like central action button */
  }

  .whatsapp-icon-inner {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background-color: #25d366;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 14px rgba(37, 211, 102, 0.35);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  }

  .tab-whatsapp:hover .whatsapp-icon-inner {
    transform: scale(1.1);
    box-shadow: 0 6px 18px rgba(37, 211, 102, 0.45);
  }

  .tab-whatsapp span {
    position: relative;
    top: 2px;
  }
}