/* ==========================================================================
   Rumayo Consulting Group - Core Stylesheet
   Design Philosophy: Clean, Corporate, Premium (McKinsey-inspired)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Merriweather:wght@300;400;700&display=swap');

/* --- CSS Variables (Design Tokens) --- */
:root {
  /* Colors */
  --clr-brand-primary: #051c2c; /* Deep McKinsey Navy */
  --clr-brand-accent: #005eb8;  /* vibrant blue for links/accents */
  --clr-background: #ffffff;
  --clr-surface: #f4f5f6;       /* Subtle off-white for sections */
  --clr-surface-alt: #e3e6e8;
  --clr-text-main: #2b2b2b;
  --clr-text-muted: #666666;
  --clr-white: #ffffff;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-serif: 'Merriweather', Georgia, 'Times New Roman', Times, serif;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;

  /* Layout */
  --max-width: 1400px;
  --content-padding: 2rem;
  
  /* Utilities */
  --transition-fast: 0.2s ease-in-out;
  --transition-normal: 0.3s ease-out;
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 24px rgba(0,0,0,0.12);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--clr-text-main);
  background-color: var(--clr-background);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography Overrides */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 400;
  color: var(--clr-brand-primary);
  line-height: 1.2;
  margin-bottom: var(--space-sm);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2.25rem); }

p {
  margin-bottom: var(--space-sm);
  font-size: 1.125rem;
}

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

a:hover {
  color: var(--clr-brand-primary);
}

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

/* --- Layout Structure --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--content-padding);
}

section {
  padding: var(--space-xl) 0;
}

.section-title {
  font-family: var(--font-sans);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
  color: var(--clr-text-muted);
  margin-bottom: var(--space-md);
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 100%;
  width: 40px;
  height: 2px;
  background-color: var(--clr-brand-accent);
  margin-left: 15px;
}

/* --- Header / Navigation --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal);
}

.site-header.scrolled-up {
  transform: translateY(0);
}

.site-header.scrolled-down {
  transform: translateY(-100%);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo a {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--clr-brand-primary);
  text-decoration: none;
}

.logo span {
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  display: block;
  text-transform: uppercase;
  color: var(--clr-brand-accent);
  margin-top: -5px;
}

.nav-menu {
  display: flex;
  gap: var(--space-md);
  list-style: none;
}

.nav-menu li a {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 500;
  color: var(--clr-text-main);
  text-decoration: none;
  padding: 0.5rem 0;
  position: relative;
}

.nav-menu li a::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background-color: var(--clr-brand-accent);
  transition: width var(--transition-fast);
}

.nav-menu li a:hover::before,
.nav-menu li a.active::before {
  width: 100%;
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px;
}

.mobile-toggle span {
  width: 25px;
  height: 2px;
  background-color: var(--clr-brand-primary);
  transition: all var(--transition-fast);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 1rem 2rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-normal);
  font-size: 0.9rem;
}

.btn-primary {
  background-color: var(--clr-brand-primary);
  color: var(--clr-white);
}

.btn-primary:hover {
  background-color: var(--clr-brand-accent);
  color: var(--clr-white);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--clr-brand-primary);
  color: var(--clr-brand-primary);
}

.btn-outline:hover {
  background-color: var(--clr-brand-primary);
  color: var(--clr-white);
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  padding-top: 80px; /* Offset header */
  background-color: var(--clr-brand-primary);
  overflow: hidden;
}

.hero-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.6; /* Overlay effect */
}

.hero-content {
  position: relative;
  z-index: 2;
  color: var(--clr-white);
  max-width: 800px;
}

.hero-content h1 {
  color: var(--clr-white);
  margin-bottom: var(--space-md);
}

.hero-content p {
  font-size: 1.25rem;
  font-weight: 300;
  opacity: 0.9;
  margin-bottom: var(--space-md);
  font-family: var(--font-serif);
}

/* --- Grids / Cards (Our Work & Capabilities) --- */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

.card {
  background-color: var(--clr-white);
  border-top: 4px solid transparent;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.card:hover {
  border-top-color: var(--clr-brand-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-5px);
}

.card-image-wrap {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
}

.card-image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.card:hover .card-image-wrap img {
  transform: scale(1.05);
}

.card-content {
  padding: var(--space-md);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.card-meta {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  text-transform: uppercase;
  color: var(--clr-brand-accent);
  font-weight: 600;
  margin-bottom: var(--space-xs);
  display: block;
}

.card-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--clr-brand-primary);
  margin-bottom: var(--space-sm);
}

.card-excerpt {
  color: var(--clr-text-muted);
  font-size: 1rem;
  margin-bottom: var(--space-md);
  flex-grow: 1;
}

.card-link {
  font-family: var(--font-sans);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  margin-top: auto;
}

.card-link::after {
  content: '→';
  margin-left: 8px;
  transition: transform var(--transition-fast);
}

.card:hover .card-link::after {
  transform: translateX(4px);
}

/* Minimal List items for Capabilities/Industries */
.capability-list {
  list-style: none;
  border-top: 1px solid var(--clr-surface-alt);
}

.capability-list li {
  border-bottom: 1px solid var(--clr-surface-alt);
}

.capability-list a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-sm) 0;
  color: var(--clr-text-main);
  font-family: var(--font-serif);
  font-size: 1.2rem;
  transition: padding-left var(--transition-fast), color var(--transition-fast);
}

.capability-list a:hover {
  color: var(--clr-brand-accent);
  padding-left: 10px;
}

.capability-list a::after {
  content: '↗';
  font-family: var(--font-sans);
  opacity: 0;
  transform: translateX(-10px);
  transition: all var(--transition-fast);
}

.capability-list a:hover::after {
  opacity: 1;
  transform: translateX(0);
}

/* Featured Insight Layout (50/50 Split) */
.featured-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  background-color: var(--clr-surface);
}

.featured-split .content {
  padding: var(--space-xl);
}

.featured-split img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 500px;
}

/* Utility Backgrounds */
.bg-surface { background-color: var(--clr-surface); }
.bg-primary { background-color: var(--clr-brand-primary); color: var(--clr-white); }
.bg-primary h2, .bg-primary h3, .bg-primary p, .bg-primary .section-title { color: var(--clr-white); }

/* Forms */
.form-group {
  margin-bottom: var(--space-sm);
}

.form-label {
  display: block;
  font-family: var(--font-sans);
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.form-control {
  width: 100%;
  padding: 1rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  border: 1px solid var(--clr-surface-alt);
  background-color: var(--clr-surface);
  transition: border-color var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--clr-brand-accent);
  background-color: var(--clr-white);
}

textarea.form-control {
  min-height: 150px;
  resize: vertical;
}

/* --- Footer --- */
.site-footer {
  background-color: var(--clr-brand-primary);
  color: var(--clr-white);
  padding: var(--space-xl) 0 var(--space-md);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.footer-widget h4 {
  color: var(--clr-white);
  font-family: var(--font-sans);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
}

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

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

.footer-links a {
  color: rgba(255,255,255,0.7);
  font-size: 0.95rem;
}

.footer-links a:hover {
  color: var(--clr-white);
}

.footer-bottom {
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
}

.social-links {
  display: flex;
  gap: var(--space-sm);
}

.social-links a {
  color: var(--clr-white);
  font-size: 1.2rem;
}

/* --- Responsive Design --- */
@media (max-width: 992px) {
  .grid-4, .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .featured-split {
    grid-template-columns: 1fr;
  }
  .featured-split img {
    min-height: 300px;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .site-header .nav-menu {
    position: fixed;
    top: 80px;
    left: 0;
    width: 100%;
    background-color: var(--clr-white);
    flex-direction: column;
    padding: var(--space-md);
    box-shadow: var(--shadow-md);
    clip-path: polygon(0 0, 100% 0, 100% 0, 0 0); /* Hidden */
    transition: clip-path var(--transition-normal);
    gap: 0;
  }

  .site-header .nav-menu.active {
    clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%); /* Visible */
  }

  .nav-menu li a {
    display: block;
    padding: 1rem 0;
    border-bottom: 1px solid var(--clr-surface-alt);
  }

  .mobile-toggle {
    display: flex;
  }

  .mobile-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .mobile-toggle.active span:nth-child(2) { opacity: 0; }
  .mobile-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .grid-2 {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }
}