/* 
  =========================================
  DESIGN SYSTEM & BRAND CONSTANTS
  Vishakh Vittal Shendige - Personal Brand
  =========================================
*/

:root {
  /* Colors */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F5F5F3;
  --accent-navy: #0D1F4C;
  --accent-orange: #E8610A;
  --text-main: #121212;
  --text-muted: #6B7280;
  --text-light: #E5E7EB;
  
  /* Typography */
  --font-display: 'Playfair Display', Georgia, serif;
  --font-serif: 'Libre Baskerville', Georgia, serif;
  --font-sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, sans-serif;
  --font-stats: 'Bebas Neue', sans-serif;

  /* Spacing */
  --section-padding: 7.5rem 2rem;
  --section-padding-mobile: 4rem 1.5rem;
  --container-max-width: 1200px;
  
  /* Animation / Transition */
  --transition-ease: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  --transition-reveal: 0.4s cubic-bezier(0.215, 0.610, 0.355, 1.000);
}

/* Base Reset & Accessibility */
*, *::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-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  color: var(--accent-navy);
}

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

button, input, select, textarea {
  font-family: inherit;
}

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

/* Keyboard Navigation Focus States */
a:focus-visible, 
button:focus-visible, 
[role="tab"]:focus-visible {
  outline: 3px solid var(--accent-orange);
  outline-offset: 4px;
}

/* Global Grid Container */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  width: 100%;
}

/* 
  =========================================
  GLOBAL COMPONENTS & UI UTILITIES
  =========================================
*/

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 2rem;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: 0; /* Strict square corners for premium corporate feel */
  cursor: pointer;
  transition: all var(--transition-ease);
  border: 2px solid transparent;
}

.btn-primary {
  background-color: var(--accent-orange);
  color: var(--bg-primary);
}

.btn-primary:hover {
  background-color: #C24D07; /* Darker orange */
  border-color: #C24D07;
}

.btn-secondary {
  background-color: transparent;
  color: var(--accent-navy);
  border-color: var(--accent-navy);
}

.btn-secondary:hover {
  background-color: var(--accent-navy);
  color: var(--bg-primary);
}

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

.btn-outline-white:hover {
  background-color: var(--bg-primary);
  color: var(--accent-navy);
}

.btn-white {
  background-color: var(--bg-primary);
  color: var(--accent-navy);
}

.btn-white:hover {
  background-color: var(--bg-secondary);
}

/* Labels */
.section-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-weight: 700;
  color: var(--accent-orange);
  display: block;
  margin-bottom: 0.75rem;
}

/* Headers */
.section-title {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  line-height: 1.2;
  font-weight: 400;
  margin-bottom: 1rem;
}

.section-title-line {
  position: relative;
  display: inline-block;
  padding-bottom: 0.75rem;
}

.section-title-line::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 45px;
  height: 2px;
  background-color: var(--accent-orange);
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 700px;
  margin-bottom: 3rem;
}

/* Reveal Transitions */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-reveal), transform var(--transition-reveal);
  will-change: transform, opacity;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Apply stagger delay using inline style variables */
.stagger-item {
  transition-delay: calc(var(--stagger-index, 0) * 80ms);
}

/* 
  =========================================
  NAVIGATION BAR
  =========================================
*/

.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--bg-secondary);
  transition: box-shadow var(--transition-ease);
}

.navbar-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 2rem;
}

.navbar-logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--accent-navy);
  display: inline-flex;
  align-items: center;
}

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

.navbar-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent-navy);
  position: relative;
  padding: 0.5rem 0;
}

.navbar-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--accent-orange);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-ease);
}

.navbar-link:hover::after,
.navbar-link.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.navbar-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

/* Mobile Nav Toggle */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  z-index: 1100;
}

.mobile-nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--accent-navy);
  margin: 5px 0;
  transition: all var(--transition-ease);
}

.mobile-nav-toggle.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.mobile-nav-toggle.open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* 
  =========================================
  SECTION 1 - HERO
  =========================================
*/

.hero-section {
  padding: 5rem 2rem 0 2rem;
  background-color: var(--bg-primary);
}

.hero-layout {
  display: flex;
  align-items: center;
  gap: 4rem;
  margin-bottom: 5rem;
}

.hero-left {
  flex: 0 0 55%;
  max-width: 55%;
}

.hero-headline {
  font-family: var(--font-display);
  font-size: 3.5rem;
  line-height: 1.15;
  color: var(--accent-navy);
  margin-top: 0.5rem;
  margin-bottom: 1.5rem;
  font-weight: 400;
}

.hero-subheadline {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 1.25rem;
}

.hero-right {
  flex: 0 0 45%;
  max-width: 45%;
  display: flex;
  flex-direction: column; /* Stack vertically */
  justify-content: center;
  align-items: center;
  position: relative;
}

/* Geometric Node-Grid Background */
.hero-grid-bg {
  position: absolute;
  top: -10%;
  left: -10%;
  width: 120%;
  height: 120%;
  background-image: radial-gradient(var(--accent-navy) 1.5px, transparent 1.5px);
  background-size: 24px 24px;
  opacity: 0.06;
  z-index: 1;
  pointer-events: none;
}

/* Headshot Placeholder Framed */
.hero-frame {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 380px; /* perfectly sized and balanced */
  aspect-ratio: 1 / 1; /* square layout, matches the headshot profile picture perfectly */
  background-color: #EFEFED;
  border: 2px solid var(--accent-orange); /* thin orange border frame */
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(13, 31, 76, 0.08);
  border-radius: 50%; /* Make it circular rather than square */
}

.hero-profile-img {
  width: 100%;
  height: 100%;
  object-fit: cover; /* prevents stretching or distortion */
  object-position: center top; /* focuses on the face/profile */
}

/* Pullquote under Hero Profile Photo */
.hero-pullquote {
  margin-top: 1.75rem;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-style: italic;
  color: var(--accent-navy);
  border-left: 2px solid var(--accent-orange);
  padding-left: 1.25rem;
  text-align: left;
  line-height: 1.5;
  max-width: 450px;
  align-self: center;
}

/* Stats Bar */
.stats-bar {
  border-top: 1px solid var(--text-light);
  border-bottom: 1px solid var(--text-light);
  padding: 2rem 0;
  background-color: var(--bg-primary);
  width: 100%;
}

.stats-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  text-align: center;
}

.stats-item {
  position: relative;
}

.stats-item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: -1rem;
  top: 15%;
  height: 70%;
  width: 1px;
  background-color: var(--text-light);
}

.stats-number {
  font-family: var(--font-stats);
  font-size: 3.5rem;
  color: var(--accent-orange);
  line-height: 1;
  margin-bottom: 0.25rem;
}

.stats-label {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-navy);
}

/* 
  =========================================
  SECTION 2 - WHAT I DO
  =========================================
*/

.what-i-do-section {
  padding: var(--section-padding);
  background-color: var(--bg-primary);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
}

.service-card {
  background-color: var(--bg-primary);
  border-top: 4px solid var(--accent-orange);
  padding: 3rem 2.25rem;
  box-shadow: 0 10px 30px rgba(13, 31, 76, 0.03);
  transition: transform var(--transition-ease), box-shadow var(--transition-ease);
}

.service-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 40px rgba(13, 31, 76, 0.08);
}

.service-icon-box {
  width: 3.5rem;
  height: 3.5rem;
  color: var(--accent-navy);
  margin-bottom: 1.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-ease);
}

.service-icon-box svg {
  width: 2.5rem;
  height: 2.5rem;
  stroke-width: 1.5;
}

.service-card:hover .service-icon-box {
  color: var(--accent-orange);
}

.service-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--accent-navy);
}

.service-desc {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 
  =========================================
  SECTION 3 - INFINITY AI
  =========================================
*/

.infinity-section {
  padding: var(--section-padding);
  background-color: var(--accent-navy);
  color: var(--bg-primary);
  position: relative;
  overflow: hidden;
}

.infinity-container {
  display: flex;
  gap: 5rem;
  align-items: center;
}

.infinity-content {
  flex: 0 0 60%;
  max-width: 60%;
}

.infinity-content h2 {
  color: var(--bg-primary);
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 3rem;
  margin-bottom: 1.5rem;
}

.infinity-desc {
  font-size: 1.125rem;
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: 2.5rem;
}

.infinity-metrics {
  flex: 0 0 40%;
  max-width: 40%;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  border-left: 1px solid rgba(255, 255, 255, 0.15);
  padding-left: 3rem;
}

.infinity-metric-item {
  display: flex;
  flex-direction: column;
}

.infinity-metric-num {
  font-family: var(--font-stats);
  font-size: 3.5rem;
  color: var(--accent-orange);
  line-height: 1;
}

.infinity-metric-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--bg-primary);
  margin-top: 0.25rem;
}

/* 
  =========================================
  SECTION 4 - WHO I HAVE TRAINED
  =========================================
*/

.trained-section {
  padding: var(--section-padding);
  background-color: var(--bg-secondary);
}

.domains-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-bottom: 4rem;
}

.domain-card {
  background-color: var(--bg-primary);
  border-left: 4px solid var(--accent-navy);
  padding: 2rem 1.5rem;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.02);
  transition: transform var(--transition-ease), box-shadow var(--transition-ease);
}

.domain-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(13, 31, 76, 0.05);
}

.domain-icon-box {
  width: 2.25rem;
  height: 2.25rem;
  color: var(--accent-orange);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.domain-icon-box svg {
  width: 1.75rem;
  height: 1.75rem;
  stroke-width: 1.5;
}

.domain-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--accent-navy);
}

.domain-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.trained-quote {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-style: italic;
  text-align: center;
  color: var(--accent-navy);
  max-width: 800px;
  margin: 0 auto;
  line-height: 1.4;
}

/* 
  =========================================
  SECTION 5 - AI TOOLS I TEACH
  =========================================
*/

.tools-section {
  padding: var(--section-padding);
  background-color: var(--bg-primary);
}

/* Tabs */
.tabs-container {
  overflow-x: auto;
  scrollbar-width: none; /* Hide scrollbar for clean aesthetic */
  margin-bottom: 3.5rem;
  border-bottom: 1px solid var(--text-light);
  display: flex;
}

.tabs-container::-webkit-scrollbar {
  display: none;
}

.tabs-list {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  padding-bottom: 1px; /* Keeps the active indicator aligned with the bottom border */
}

.tab-btn {
  background: none;
  border: none;
  padding: 1rem 0.5rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent-navy);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  cursor: pointer;
  white-space: nowrap;
  position: relative;
  transition: color var(--transition-ease);
}

.tab-btn::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--accent-orange);
  transform: scaleX(0);
  transition: transform var(--transition-ease);
}

.tab-btn:hover {
  color: var(--accent-orange);
}

.tab-btn.active {
  color: var(--accent-navy);
}

.tab-btn.active::after {
  transform: scaleX(1);
}

/* Tool Grid Content */
.tab-content {
  display: none;
}

.tab-content.active {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1.5rem;
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.tool-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--bg-secondary);
  padding: 2rem 1.5rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-ease);
}

.tool-card:hover {
  border-color: rgba(232, 97, 10, 0.4);
  box-shadow: 0 12px 30px rgba(13, 31, 76, 0.08);
  transform: translateY(-4px); /* Sleek card elevation */
}

.tool-logo-container {
  width: 3.5rem;
  height: 3.5rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tool-logo-container svg,
.tool-logo-container img {
  width: 3rem;
  height: 3rem;
  object-fit: contain;
  transition: transform var(--transition-ease);
  /* Full color by default, no grayscale filter */
  filter: none;
}

.tool-card:hover .tool-logo-container svg,
.tool-card:hover .tool-logo-container img {
  transform: scale(1.08); /* Faint pop micro-animation */
}

.tool-name {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--accent-navy);
  letter-spacing: 0.02em;
}

.tools-note {
  margin-top: 3.5rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
  text-align: center;
}

/* 
  =========================================
  SECTION 6 - PUBLISHED BOOKS
  =========================================
*/

.books-section {
  padding: var(--section-padding);
  background-color: var(--bg-secondary);
}

.bookshelf-outer {
  width: 100%;
  position: relative;
}

/* Desktop Horizontal Scroll Shelf */
.bookshelf-scroll {
  display: flex;
  gap: 2.25rem;
  overflow-x: auto;
  padding: 1.5rem 0.5rem 3rem 0.5rem;
  scroll-snap-type: x mandatory;
  scrollbar-width: auto;
}

.bookshelf-scroll::-webkit-scrollbar {
  height: 8px;
}

.bookshelf-scroll::-webkit-scrollbar-track {
  background: var(--bg-secondary);
  border-radius: 4px;
}

.bookshelf-scroll::-webkit-scrollbar-thumb {
  background: var(--text-light);
  border-radius: 4px;
}

.bookshelf-scroll::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

.book-card {
  flex: 0 0 350px;
  background-color: var(--bg-primary);
  border-top: 4px solid var(--accent-orange);
  padding: 2.25rem;
  box-shadow: 0 12px 25px -5px rgba(13, 31, 76, 0.08);
  display: flex;
  flex-direction: column;
  scroll-snap-align: start;
  transition: transform var(--transition-ease), box-shadow var(--transition-ease);
}

.book-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 35px -5px rgba(13, 31, 76, 0.15);
}

/* Visual Rectangular Book Cover Thumbnail Placeholder */
.book-cover-image-placeholder {
  width: 100%;
  aspect-ratio: 3 / 4;
  margin-bottom: 1.75rem;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2.25rem 1.5rem;
  box-shadow: 5px 15px 25px rgba(13, 31, 76, 0.2); /* subtle navy drop shadow */
  border: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  color: #FFFFFF;
}

/* Spine overlay to make book covers feel physical */
.book-cover-image-placeholder::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 14px;
  height: 100%;
  background: linear-gradient(to right, rgba(0,0,0,0.2) 0%, rgba(0,0,0,0) 100%);
  z-index: 2;
}

.book-cover-placeholder-label {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #FFFFFF;
  line-height: 1.4;
  border: 1px solid rgba(255, 255, 255, 0.25);
  padding: 1rem 0.5rem;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Elegant Gradient schemes for a colorful library shelf */
.book-cover-1 {
  background: linear-gradient(135deg, #0d1f4c 0%, #1e3a7a 100%);
}
.book-cover-2 {
  background: linear-gradient(135deg, #1e3a7a 0%, #e8610a 100%);
}
.book-cover-3 {
  background: linear-gradient(135deg, #0d1f4c 0%, #3a4b7c 100%);
}
.book-cover-4 {
  background: linear-gradient(135deg, #e8610a 0%, #d65205 100%);
}
.book-cover-5 {
  background: linear-gradient(135deg, #1c2b54 0%, #2e3e6b 100%);
}
.book-cover-6 {
  background: linear-gradient(135deg, #2b3e6c 0%, #0d1f4c 100%);
}

.book-info-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.75rem;
}

.book-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent-navy);
  line-height: 1.3;
}

.book-year {
  background-color: rgba(232, 97, 10, 0.1);
  color: var(--accent-orange);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.625rem;
  border-radius: 0;
  line-height: 1;
}

.book-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.book-link {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--accent-orange);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.book-link:hover {
  color: #C24D07;
}

/* 
  =========================================
  SECTION 7 - PHILOSOPHY QUOTE BLOCK
  =========================================
*/

.philosophy-section {
  padding: 8.5rem 2rem;
  background-color: var(--accent-navy);
  color: var(--bg-primary);
  text-align: center;
}

.philosophy-container {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.philosophy-divider {
  width: 80px;
  height: 2px;
  background-color: var(--accent-orange);
  border: none;
}

.philosophy-quote {
  font-family: var(--font-display);
  font-size: 2.25rem;
  font-style: italic;
  line-height: 1.5;
  font-weight: 400;
  margin: 3.5rem 0;
  color: var(--bg-primary);
}

.philosophy-author {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-orange);
  margin-bottom: 3.5rem;
}

/* 
  =========================================
  SECTION 8 - CREDENTIALS
  =========================================
*/

.credentials-section {
  padding: var(--section-padding);
  background-color: var(--bg-primary);
}

.credentials-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
}

.credentials-left {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.credentials-left-text {
  font-size: 1.0625rem;
  color: var(--text-main);
  line-height: 1.7;
}

.credentials-right {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.credential-card {
  background-color: var(--bg-primary);
  border-left: 4px solid var(--accent-orange);
  padding: 2.25rem;
  box-shadow: 0 8px 25px rgba(13, 31, 76, 0.03);
  transition: transform var(--transition-ease), box-shadow var(--transition-ease);
}

.credential-card:hover {
  transform: translateX(5px);
  box-shadow: 0 12px 30px rgba(13, 31, 76, 0.06);
}

.credential-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--accent-navy);
  margin-bottom: 0.5rem;
}

.credential-institution {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.credential-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* 
  =========================================
  SECTION 9 - SPEAKING & TRAINING
  =========================================
*/

.speaking-section {
  padding: var(--section-padding);
  background-color: var(--bg-secondary);
}

.programs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.program-card {
  background-color: var(--bg-primary); /* white background */
  border-left: 4px solid var(--accent-orange); /* 4px orange left border */
  padding: 2.25rem 2rem;
  box-shadow: 0 8px 20px rgba(13, 31, 76, 0.02);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-ease), box-shadow var(--transition-ease);
}

.program-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(13, 31, 76, 0.06);
}

.program-title {
  font-family: var(--font-sans);
  font-weight: 500; /* IBM Plex Sans Medium */
  color: var(--accent-navy); /* navy */
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.program-desc {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--text-muted); /* slate grey */
  line-height: 1.5;
}

.speaking-cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.speaking-note {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* 
  =========================================
  SECTION 10 - CALL TO ACTION
  =========================================
*/

.cta-section {
  padding: 6rem 2rem;
  background-color: var(--accent-orange);
  color: var(--bg-primary);
  text-align: center;
}

.cta-container {
  max-width: 800px;
  margin: 0 auto;
}

.cta-headline {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 400;
  margin-bottom: 1.25rem;
  color: var(--bg-primary);
}

.cta-subcopy {
  font-size: 1.125rem;
  margin-bottom: 3rem;
  color: rgba(255, 255, 255, 0.9);
}

.cta-actions {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
}

/* 
  =========================================
  SECTION 11 - FOOTER
  =========================================
*/

.footer {
  padding: 5rem 2rem 3rem 2rem;
  background-color: var(--accent-navy);
  color: var(--bg-primary);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 2fr 1fr;
  gap: 4rem;
  margin-bottom: 4rem;
}

.footer-left {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-name {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.footer-sublabel {
  font-size: 0.8125rem;
  color: var(--text-light);
  line-height: 1.5;
}

.footer-social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--bg-primary);
  margin-top: 1rem;
  transition: all var(--transition-ease);
}

.footer-social-link:hover {
  background-color: var(--accent-orange);
  border-color: var(--accent-orange);
}

.footer-social-link svg {
  width: 1.25rem;
  height: 1.25rem;
}

.footer-centre {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.footer-title {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-orange);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  list-style: none;
}

.footer-nav-link {
  font-size: 0.875rem;
  color: var(--text-light);
}

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

.footer-right {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: flex-end;
}

.footer-copyright {
  font-size: 0.75rem;
  color: var(--text-light);
  text-align: right;
  line-height: 1.6;
}

/* 
  =========================================
  RESPONSIVE BREAKPOINTS
  =========================================
*/

/* 1280px Desktop / Laptop Adjustments */
@media (max-width: 1280px) {
  html {
    font-size: 15px; /* Scale down layouts slightly */
  }
  
  .navbar-container,
  .hero-layout,
  .stats-container,
  .services-grid,
  .infinity-container,
  .domains-grid,
  .tab-content.active,
  .bookshelf-scroll,
  .credentials-layout,
  .programs-grid,
  .footer-container {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

/* 1024px Medium Devices / Landscape Tablets */
@media (max-width: 1024px) {
  :root {
    --section-padding: 5.5rem 1.5rem;
  }
  
  .hero-layout {
    gap: 2.5rem;
  }
  
  .domains-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .tab-content.active {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .footer-container {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }
  
  .footer-right {
    grid-column: span 2;
    align-items: flex-start;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
  }
  
  .footer-copyright {
    text-align: left;
  }
}

/* 768px Portrait Tablets & Small Screens */
@media (max-width: 768px) {
  :root {
    --section-padding: 4.5rem 1rem;
  }
  
  /* Mobile Menu */
  .mobile-nav-toggle {
    display: block;
  }
  
  .navbar-links {
    position: fixed;
    top: 73px;
    left: 0;
    right: 0;
    background-color: var(--bg-primary);
    border-bottom: 2px solid var(--bg-secondary);
    flex-direction: column;
    padding: 2rem;
    gap: 1.5rem;
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
    transform: translateY(-150%);
    transition: transform var(--transition-ease);
    z-index: 999;
  }
  
  .navbar-links.open {
    transform: translateY(0);
  }
  
  .navbar-right {
    display: none; /* Hide secondary buttons on mobile or move to menu */
  }
  
  /* Hero section */
  .hero-layout {
    flex-direction: column-reverse;
    gap: 3rem;
    text-align: center;
  }
  
  .hero-left, .hero-right {
    flex: 0 0 100%;
    max-width: 100%;
  }
  
  .hero-headline {
    font-size: 2.75rem;
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  /* Stats Bar */
  .stats-container {
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
  }
  
  .stats-item:nth-child(2)::after {
    display: none;
  }
  
  /* Services */
  .services-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  /* Infinity Section */
  .infinity-container {
    flex-direction: column;
    gap: 3rem;
  }
  
  .infinity-content, .infinity-metrics {
    flex: 0 0 100%;
    max-width: 100%;
  }
  
  .infinity-metrics {
    border-left: none;
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    padding-left: 0;
    padding-top: 2rem;
    flex-direction: row;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1.5rem;
  }
  
  /* Domains */
  .domains-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  /* Tabs */
  .tab-content.active {
    grid-template-columns: repeat(2, 1fr);
  }
  
  /* Bookshelf - 2 Columns on Mobile */
  .bookshelf-scroll {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    overflow-x: visible;
  }
  
  .book-card {
    flex: initial;
    width: 100%;
    padding: 1.5rem;
  }
  
  .book-cover-image-placeholder {
    padding: 1rem;
  }
  
  .book-cover-title {
    font-size: 1.125rem;
  }
  
  /* Credentials */
  .credentials-layout {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  
  /* Offerings */
  .programs-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  /* CTA */
  .cta-headline {
    font-size: 2.25rem;
  }
  
  .cta-actions {
    flex-direction: column;
    gap: 1rem;
    max-width: 320px;
    margin: 0 auto;
  }
  
  .cta-actions .btn {
    width: 100%;
  }
}

/* 375px Mobile Breakpoint */
@media (max-width: 480px) {
  html {
    font-size: 14px;
  }
  
  .hero-headline {
    font-size: 2.25rem;
  }
  
  .hero-actions {
    flex-direction: column;
    gap: 1rem;
  }
  
  .hero-actions .btn {
    width: 100%;
  }
  
  .stats-container {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .stats-item::after {
    display: none !important;
  }
  
  .domains-grid {
    grid-template-columns: 1fr;
  }
  
  .tab-content.active {
    grid-template-columns: 1fr;
  }
  
  .bookshelf-scroll {
    grid-template-columns: 1fr;
  }
  
  .footer-container {
    grid-template-columns: 1fr;
  }
}