/* ============================================
   Chief AI Officer — Clarity-First Design System
   Reference: mix-c-clarity-first.html
   ============================================ */

/* ============= DESIGN TOKENS ============= */
:root {
  /* Colors */
  --color-black: #000;
  --color-white: #fff;
  --color-blue: #2563eb;
  --color-gray: #666;
  --color-gray-light: #f3f4f6;
  --color-gray-border: #e5e7eb;
  --color-gray-dark: #333;
  --color-gray-muted: #999;

  /* Typography */
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Spacing */
  --section-padding-desktop: 150px;
  --section-padding-mobile: 100px;
  --content-padding: 4rem;
  --content-padding-mobile: 2rem;
  --max-width: 1400px;

  /* Transitions */
  --transition-speed: 0.3s;
}

/* ============= BASE RESET & TYPOGRAPHY ============= */
html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--color-white);
  color: var(--color-black);
  line-height: 1.6;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1 {
  font-family: var(--font-display);
  font-size: clamp(3rem, 10vw, 6rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 2rem;
}

h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 8vw, 4rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 2rem;
}

h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

p {
  font-size: 1.0625rem;
  line-height: 1.7;
  margin-bottom: 1.5rem;
  color: var(--color-black);
}

a {
  color: inherit;
  text-decoration: none;
}

/* ============= TASK 2: HEADER, FOOTER, BUTTONS, MOBILE MENU, FLASH ============= */

/* ============= HEADER & NAV ============= */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem var(--content-padding);
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-black);
}

.header-logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.05em;
  color: var(--color-black);
}

.header-nav {
  display: flex;
  gap: 3rem;
  font-size: 0.95rem;
  font-weight: 500;
  align-items: center;
}

.header-nav-link {
  color: var(--color-black);
  text-decoration: none;
  position: relative;
  transition: opacity var(--transition-speed);
}

.header-nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-blue);
  transition: width var(--transition-speed);
}

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

.header-cta-button {
  background: var(--color-black);
  color: var(--color-white);
  padding: 0.75rem 1.5rem;
  font-size: 0.9rem;
  font-weight: 500;
  font-family: var(--font-body);
  border: 1px solid var(--color-black);
  transition: background var(--transition-speed);
}

.header-cta-button:hover {
  background: #1f2937;
}

/* ============= FOOTER ============= */
.footer {
  background: var(--color-black);
  color: var(--color-white);
  padding: 3rem var(--content-padding);
  border-top: 1px solid var(--color-gray-dark);
  font-size: 0.9rem;
}

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

.footer-content h4 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-white);
  margin-bottom: 0;
}

.footer-content a {
  color: var(--color-blue);
  transition: opacity var(--transition-speed);
}

.footer-content a:hover {
  opacity: 0.7;
}

.footer-content p {
  color: var(--color-gray-muted);
  margin-bottom: 0;
  font-size: 0.9rem;
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 2rem auto 0;
  padding-top: 2rem;
  border-top: 1px solid var(--color-gray-dark);
  text-align: center;
}

.footer-bottom p {
  color: var(--color-gray-muted);
  font-size: 0.85rem;
  margin: 0;
}

/* ============= BUTTONS & LINKS ============= */
.btn-primary {
  display: inline-block;
  background: var(--color-black);
  color: var(--color-white);
  padding: 1rem 2rem;
  border: 1px solid var(--color-black);
  font-size: 1rem;
  font-weight: 500;
  font-family: var(--font-body);
  cursor: pointer;
  transition: background var(--transition-speed);
}

.btn-primary:hover {
  background: #1f2937;
}

.btn-secondary {
  display: inline-block;
  background: var(--color-white);
  color: var(--color-black);
  padding: 1rem 2rem;
  border: 1px solid var(--color-black);
  font-size: 1rem;
  font-weight: 500;
  font-family: var(--font-body);
  cursor: pointer;
  transition: background var(--transition-speed);
}

.btn-secondary:hover {
  background: var(--color-gray-light);
}

.cta-link {
  display: inline-block;
  color: var(--color-blue);
  text-decoration: none;
  font-weight: 500;
  position: relative;
  transition: color var(--transition-speed);
  width: fit-content;
}

.cta-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--color-blue);
  transition: all var(--transition-speed);
}

.cta-link:hover::after {
  bottom: -8px;
}

/* ============= BURGER MENU ============= */
.burger-button {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.burger-button span {
  display: block;
  width: 24px;
  height: 1px;
  background: var(--color-black);
  transition: all var(--transition-speed);
}

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

.burger-button.open span:nth-child(2) {
  opacity: 0;
}

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

/* ============= MOBILE OVERLAY ============= */
.mobile-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 99;
  background: var(--color-white);
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 2rem;
}

.mobile-overlay.open {
  display: flex;
}

.mobile-overlay-link {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-black);
  transition: color var(--transition-speed);
}

.mobile-overlay-link:hover {
  color: var(--color-blue);
}

.mobile-overlay-cta {
  background: var(--color-black);
  color: var(--color-white);
  padding: 1rem 2rem;
  font-size: 1rem;
  font-weight: 500;
  margin-top: 1rem;
}

body.menu-open {
  overflow: hidden;
}

/* ============= FLASH MESSAGES ============= */
.flash-notice {
  position: fixed;
  top: 90px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1001;
  max-width: 600px;
  width: 90%;
}

.flash-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  background: var(--color-white);
  border: 1px solid var(--color-black);
  font-size: 0.95rem;
}

.flash-content p {
  margin: 0;
  color: var(--color-black);
}

.flash-close {
  background: none;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  padding: 0 0 0 1rem;
  color: var(--color-black);
}

.flash-notice.fade-out {
  opacity: 0;
  transition: opacity 0.3s ease;
}

/* ============= TASK 3: HERO, NUMBERS, SERVICES, TESTIMONIAL, CTA ============= */

/* ============= SECTIONS - GENERAL ============= */
.section {
  padding: var(--section-padding-desktop) var(--content-padding);
  max-width: var(--max-width);
  margin: 0 auto;
  border-bottom: 1px solid var(--color-black);
}

/* ============= HERO ============= */
.page-hero {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 100vh;
  padding: var(--content-padding);
  max-width: var(--max-width);
  margin: 0 auto;
}

.page-hero--inner {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--section-padding-desktop) var(--content-padding);
  max-width: var(--max-width);
  margin: 0 auto;
}

.page-hero h1 {
  max-width: 1200px;
}

.page-hero .hero-subtitle {
  font-size: 1.125rem;
  line-height: 1.7;
  max-width: 680px;
  margin-bottom: 3rem;
  font-weight: 400;
  color: var(--color-black);
}

.page-hero--inner .hero-subtitle {
  font-size: 1.125rem;
  line-height: 1.7;
  max-width: 680px;
  margin-bottom: 3rem;
  font-weight: 400;
  color: var(--color-black);
}

/* ============= NUMBERS ============= */
.numbers-section {
  padding: var(--section-padding-desktop) var(--content-padding);
  max-width: var(--max-width);
  margin: 0 auto;
  border-top: 1px solid var(--color-black);
  border-bottom: 1px solid var(--color-black);
}

.numbers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 4rem;
}

.number-item {
  text-align: left;
}

.number-value {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 8vw, 4rem);
  font-weight: 700;
  line-height: 1;
  margin-bottom: 1rem;
  color: var(--color-black);
}

.number-label {
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--color-black);
  max-width: 300px;
}

/* ============= SERVICES ============= */
.services-section {
  padding: var(--section-padding-desktop) var(--content-padding);
  max-width: var(--max-width);
  margin: 0 auto;
  border-bottom: 1px solid var(--color-black);
}

.services-grid {
  display: grid;
  gap: 4rem;
}

.service-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
  padding-bottom: 4rem;
  border-bottom: 1px solid var(--color-black);
}

.service-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.service-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 5vw, 2.5rem);
  font-weight: 700;
  line-height: 1.2;
}

.service-description {
  font-size: 1rem;
  line-height: 1.7;
  max-width: 600px;
  color: var(--color-black);
}

.service-description a {
  color: var(--color-blue);
}

/* ============= TESTIMONIAL ============= */
.testimonial-section {
  padding: var(--section-padding-desktop) var(--content-padding);
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
  border-bottom: 1px solid var(--color-black);
}

.quote-mark {
  font-family: var(--font-display);
  font-size: 4rem;
  color: var(--color-blue);
  line-height: 1;
  margin-bottom: 1rem;
}

.quote-text {
  font-size: 1.5rem;
  line-height: 1.8;
  margin-bottom: 2rem;
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
  font-weight: 400;
  color: var(--color-black);
}

.quote-attribution {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-gray);
}

/* ============= CTA SECTION ============= */
.cta-section {
  background: var(--color-black);
  color: var(--color-white);
  padding: var(--section-padding-desktop) var(--content-padding);
  text-align: center;
}

.cta-section h2 {
  color: var(--color-white);
}

.cta-section p {
  color: var(--color-gray-muted);
}

.cta-section .cta-link {
  color: var(--color-blue);
}

.cta-section .btn-primary {
  background: var(--color-white);
  color: var(--color-black);
  border-color: var(--color-white);
}

.cta-section .btn-primary:hover {
  background: var(--color-gray-border);
}

/* ============= TASK 4: TRAINING, CONSULTING, PERSONALIZATION, ABOUT, BLOG, CONTACT ============= */

/* ============= TRAINING — ACCORDION ============= */
.programs-section {
  padding: var(--section-padding-desktop) var(--content-padding);
  max-width: var(--max-width);
  margin: 0 auto;
  border-bottom: 1px solid var(--color-black);
}

.program-card {
  border: 1px solid var(--color-black);
  margin-bottom: -1px;
}

.program-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 2rem;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  transition: background var(--transition-speed);
}

.program-header:hover {
  background: var(--color-gray-light);
}

.program-header .toggle-icon {
  font-size: 1.5rem;
  transition: transform var(--transition-speed);
}

.program-card.open .toggle-icon {
  transform: rotate(45deg);
}

.program-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.program-body-inner {
  padding: 0 2rem 2rem;
  font-size: 1rem;
  line-height: 1.7;
}

.program-body-inner p {
  color: var(--color-black);
}

/* ============= TRAINING — TABS ============= */
.audiences-section {
  padding: var(--section-padding-desktop) var(--content-padding);
  max-width: var(--max-width);
  margin: 0 auto;
  border-bottom: 1px solid var(--color-black);
}

.tab-buttons {
  display: flex;
  gap: 0;
  margin-bottom: 3rem;
}

.tab-button {
  flex: 1;
  padding: 1rem;
  border: 1px solid var(--color-black);
  background: var(--color-white);
  color: var(--color-black);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-speed);
  margin-right: -1px;
}

.tab-button:hover {
  background: var(--color-gray-light);
}

.tab-button.active {
  background: var(--color-black);
  color: var(--color-white);
}

.tab-panel {
  display: none;
}

.tab-panel.visible {
  display: block;
}

.tab-panel.hidden {
  display: none;
}

/* ============= TRAINING — METHODOLOGY ============= */
.methodology-section {
  padding: var(--section-padding-desktop) var(--content-padding);
  max-width: var(--max-width);
  margin: 0 auto;
  border-bottom: 1px solid var(--color-black);
}

.methodology-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 3rem;
}

.methodology-step {
  padding-top: 2rem;
  border-top: 2px solid var(--color-blue);
}

.step-number {
  display: block;
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-blue);
  margin-bottom: 1rem;
}

.step-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

/* ============= CONSULTING — LADDER ============= */
.ladder-section {
  padding: var(--section-padding-desktop) var(--content-padding);
  max-width: var(--max-width);
  margin: 0 auto;
  border-bottom: 1px solid var(--color-black);
}

.ladder-grid {
  display: grid;
  gap: 4rem;
}

.ladder-step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2rem;
  padding-bottom: 4rem;
  border-bottom: 1px solid var(--color-black);
}

.ladder-step:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.ladder-marker {
  border-left: 2px solid var(--color-blue);
  padding-left: 2rem;
}

.ladder-number {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 700;
  color: var(--color-blue);
  line-height: 1;
}

.ladder-title {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 4vw, 2rem);
  font-weight: 700;
  margin-bottom: 1rem;
}

.ladder-description {
  font-size: 1rem;
  line-height: 1.7;
  max-width: 600px;
}

.ladder-price {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--color-blue);
  margin-top: 1rem;
}

/* ============= CONSULTING — UPSELL CHAIN ============= */
.upsell-chain {
  padding: var(--section-padding-desktop) var(--content-padding);
  max-width: var(--max-width);
  margin: 0 auto;
  border-bottom: 1px solid var(--color-black);
  text-align: center;
}

.upsell-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
  margin-top: 3rem;
}

.upsell-step {
  padding: 1.5rem 2rem;
  border: 1px solid var(--color-black);
  font-family: var(--font-display);
  font-weight: 600;
}

.upsell-arrow {
  font-size: 1.5rem;
  color: var(--color-blue);
}

/* ============= PERSONALIZATION — STACK ============= */
.stack-section {
  padding: var(--section-padding-desktop) var(--content-padding);
  max-width: var(--max-width);
  margin: 0 auto;
  border-bottom: 1px solid var(--color-black);
}

.stack-visualization {
  display: grid;
  gap: 0;
}

.stack-level {
  padding: 2rem;
  border: 1px solid var(--color-black);
  margin-bottom: -1px;
}

.stack-level-number {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-blue);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.stack-level-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.stack-items {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.stack-item {
  padding: 0.5rem 1rem;
  border: 1px solid var(--color-gray-border);
  font-size: 0.9rem;
}

/* ============= PERSONALIZATION — METRICS ============= */
.metrics-section {
  padding: var(--section-padding-desktop) var(--content-padding);
  max-width: var(--max-width);
  margin: 0 auto;
  border-bottom: 1px solid var(--color-black);
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 3rem;
}

.metric-item {
  text-align: left;
  border-left: 2px solid var(--color-blue);
  padding-left: 1.5rem;
}

.metric-value {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 700;
  line-height: 1;
  margin-bottom: 0.5rem;
}

.metric-label {
  font-size: 0.95rem;
  color: var(--color-gray);
}

/* ============= PERSONALIZATION — NARRATIVE ============= */
.narrative-section {
  padding: var(--section-padding-desktop) var(--content-padding);
  max-width: var(--max-width);
  margin: 0 auto;
  border-bottom: 1px solid var(--color-black);
}

.narrative-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}

.narrative-block {
  padding-top: 2rem;
  border-top: 2px solid var(--color-blue);
}

.narrative-label {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-blue);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

/* ============= ABOUT — EXPERIENCE ============= */
.experience-section {
  padding: var(--section-padding-desktop) var(--content-padding);
  max-width: var(--max-width);
  margin: 0 auto;
  border-bottom: 1px solid var(--color-black);
}

.experience-grid {
  display: grid;
  gap: 4rem;
}

.experience-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 3rem;
  padding-bottom: 4rem;
  border-bottom: 1px solid var(--color-black);
}

.experience-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.experience-period {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--color-blue);
}

.experience-role {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.experience-company {
  font-weight: 500;
  margin-bottom: 1rem;
  color: var(--color-gray);
}

/* ============= ABOUT — APPROACH ============= */
.approach-section {
  padding: var(--section-padding-desktop) var(--content-padding);
  max-width: var(--max-width);
  margin: 0 auto;
  border-bottom: 1px solid var(--color-black);
}

.approach-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 3rem;
}

.approach-card {
  padding-top: 2rem;
  border-top: 2px solid var(--color-blue);
}

.approach-card h3 {
  font-family: var(--font-display);
}

/* ============= ABOUT — EXPERTISE ============= */
.expertise-section {
  padding: var(--section-padding-desktop) var(--content-padding);
  max-width: var(--max-width);
  margin: 0 auto;
  border-bottom: 1px solid var(--color-black);
}

.expertise-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.expertise-item {
  padding: 1.5rem;
  border: 1px solid var(--color-black);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
  transition: background var(--transition-speed);
}

.expertise-item:hover {
  background: var(--color-gray-light);
}

/* ============= BLOG ============= */
.blog-section {
  padding: var(--section-padding-desktop) var(--content-padding);
  max-width: var(--max-width);
  margin: 0 auto;
}

.blog-filters {
  display: flex;
  gap: 1rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.filter-button {
  padding: 0.5rem 1.5rem;
  border: 1px solid var(--color-black);
  background: var(--color-white);
  color: var(--color-black);
  font-family: var(--font-body);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition-speed);
}

.filter-button:hover,
.filter-button.active {
  background: var(--color-black);
  color: var(--color-white);
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.blog-card {
  border: 1px solid var(--color-black);
  transition: background var(--transition-speed);
}

.blog-card:hover {
  background: var(--color-gray-light);
}

.blog-card-body {
  padding: 2rem;
}

.blog-card-category {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-blue);
  margin-bottom: 0.75rem;
}

.blog-card-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.blog-card-excerpt {
  font-size: 0.95rem;
  color: var(--color-gray);
  margin-bottom: 1rem;
  line-height: 1.6;
}

.blog-card-meta {
  font-size: 0.85rem;
  color: var(--color-gray-muted);
}

/* ============= BLOG — ARTICLE ============= */
.article-header {
  padding: var(--section-padding-desktop) var(--content-padding);
  max-width: 800px;
  margin: 0 auto;
  border-bottom: 1px solid var(--color-black);
}

.article-breadcrumb {
  font-size: 0.9rem;
  margin-bottom: 2rem;
}

.article-breadcrumb a {
  color: var(--color-blue);
}

.article-category {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-blue);
  margin-bottom: 1rem;
}

.article-meta {
  font-size: 0.9rem;
  color: var(--color-gray);
  margin-top: 1.5rem;
}

.article-body {
  padding: 4rem var(--content-padding);
  max-width: 800px;
  margin: 0 auto;
}

.article-body h2 {
  font-size: 1.75rem;
  margin-top: 3rem;
}

.article-body h3 {
  font-size: 1.25rem;
  margin-top: 2rem;
}

.article-body p {
  color: var(--color-black);
}

.article-body ul,
.article-body ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.article-body li {
  margin-bottom: 0.5rem;
  line-height: 1.7;
}

.article-body code {
  font-size: 0.9em;
  background: var(--color-gray-light);
  padding: 0.15em 0.4em;
}

.article-body pre {
  background: var(--color-black);
  color: var(--color-white);
  padding: 2rem;
  overflow-x: auto;
  margin-bottom: 1.5rem;
}

.article-body pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.article-body blockquote {
  border-left: 2px solid var(--color-blue);
  padding-left: 1.5rem;
  margin: 2rem 0;
  font-style: italic;
}

/* ============= BLOG — SERIES NAV ============= */
.series-nav {
  padding: 3rem var(--content-padding);
  max-width: 800px;
  margin: 0 auto;
  border-top: 1px solid var(--color-black);
  border-bottom: 1px solid var(--color-black);
}

.series-nav h3 {
  margin-bottom: 1.5rem;
}

.series-list {
  list-style: none;
  padding: 0;
}

.series-list li {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-gray-border);
}

.series-list li:last-child {
  border-bottom: none;
}

.series-list a {
  color: var(--color-blue);
}

.series-list .current {
  font-weight: 600;
  color: var(--color-black);
}

/* ============= RELATED POSTS ============= */
.related-posts {
  padding: var(--section-padding-desktop) var(--content-padding);
  max-width: var(--max-width);
  margin: 0 auto;
}

/* ============= CONTACT FORM ============= */
.contact-section {
  padding: var(--section-padding-desktop) var(--content-padding);
  max-width: var(--max-width);
  margin: 0 auto;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 4rem;
}

.contact-info h2 {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
}

.contact-info a {
  color: var(--color-blue);
}

.contact-form .form-group {
  margin-bottom: 1.5rem;
}

.contact-form label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.contact-form input,
.contact-form textarea,
.contact-form select {
  width: 100%;
  padding: 1rem;
  border: 1px solid var(--color-black);
  background: var(--color-white);
  font-family: var(--font-body);
  font-size: 1rem;
  transition: border-color var(--transition-speed);
}

.contact-form input:focus,
.contact-form textarea:focus,
.contact-form select:focus {
  outline: none;
  border-color: var(--color-blue);
}

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

.contact-form .form-errors {
  padding: 1rem;
  border: 1px solid var(--color-black);
  background: var(--color-gray-light);
  margin-bottom: 2rem;
}

.contact-form .form-errors p {
  color: var(--color-black);
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.contact-form .form-errors ul {
  padding-left: 1.5rem;
  margin: 0;
}

/* ============= ANIMATIONS ============= */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
}

.fade-up.in-view {
  opacity: 1;
  transform: translateY(0);
  transition: all 0.8s ease;
}

/* ============= QUIZ ============= */
.quiz-section {
  padding: var(--section-padding-desktop) var(--content-padding);
  max-width: var(--max-width);
  margin: 0 auto;
  border-bottom: 1px solid var(--color-black);
}

.quiz-section h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 8vw, 4rem);
  font-weight: 700;
  margin-bottom: 3rem;
  max-width: 680px;
}

.quiz-container {
  max-width: 680px;
}

.quiz-progress {
  height: 2px;
  background: var(--color-gray-border);
  margin-bottom: 3rem;
  overflow: hidden;
}

.quiz-progress-bar {
  height: 100%;
  background: var(--color-blue);
  transition: width 0.4s ease;
}

.quiz-step {
  display: none;
  opacity: 0;
  animation: quizFadeIn 0.5s ease forwards;
}

.quiz-step.active {
  display: block;
  opacity: 1;
}

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

.quiz-question {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 2rem;
  line-height: 1.4;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2rem;
}

.quiz-option {
  display: flex;
  align-items: center;
  padding: 1rem;
  border: 1px solid var(--color-black);
  background: var(--color-white);
  cursor: pointer;
  transition: all var(--transition-speed);
  font-size: 1rem;
}

.quiz-option:hover {
  background: var(--color-gray-light);
}

.quiz-option.selected {
  background: var(--color-black);
  color: var(--color-white);
  border-color: var(--color-black);
}

.quiz-option input {
  margin-right: 1rem;
  cursor: pointer;
  width: 18px;
  height: 18px;
}

.slider-container {
  margin-bottom: 2rem;
}

.slider-value {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--color-blue);
}

input[type="range"] {
  width: 100%;
  height: 2px;
  background: var(--color-gray-border);
  outline: none;
  -webkit-appearance: none;
  appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-black);
  cursor: pointer;
  transition: background var(--transition-speed);
}

input[type="range"]::-webkit-slider-thumb:hover {
  background: var(--color-blue);
}

.quiz-navigation {
  display: flex;
  gap: 1rem;
  margin-bottom: 3rem;
}

.quiz-button {
  flex: 1;
  padding: 1rem;
  border: 1px solid var(--color-black);
  background: var(--color-white);
  color: var(--color-black);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-speed);
  font-family: var(--font-body);
}

.quiz-button:hover {
  background: var(--color-gray-light);
}

.quiz-button.next {
  background: var(--color-black);
  color: var(--color-white);
}

.quiz-button.next:hover {
  background: #1f2937;
}

.quiz-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.quiz-result {
  display: none;
  padding: 2rem;
  border: 1px solid var(--color-black);
}

.quiz-result.show {
  display: block;
  animation: quizFadeIn 0.5s ease forwards;
}

.result-score {
  font-family: var(--font-display);
  font-size: 4rem;
  font-weight: 700;
  color: var(--color-blue);
  margin: 1rem 0;
}

.result-label {
  font-size: 1.125rem;
  font-weight: 500;
  margin-bottom: 2rem;
}

.result-bar {
  height: 8px;
  background: var(--color-gray-border);
  margin: 2rem 0;
  overflow: hidden;
}

.result-bar-fill {
  height: 100%;
  background: var(--color-blue);
  transition: width 1s ease;
}

.result-tier {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  margin: 2rem 0;
}

.result-recommendation {
  font-size: 1rem;
  line-height: 1.7;
  margin: 2rem 0;
}

.quiz-email-form {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-gray-border);
}

.quiz-email-form .form-group {
  margin-bottom: 1rem;
}

.quiz-email-form input {
  width: 100%;
  padding: 1rem;
  border: 1px solid var(--color-black);
  font-family: var(--font-body);
  font-size: 1rem;
}

.quiz-email-form input:focus {
  outline: none;
  border-color: var(--color-blue);
}

.quiz-success {
  display: none;
  text-align: center;
  padding: 2rem;
}

.quiz-success.show {
  display: block;
  animation: quizFadeIn 0.5s ease forwards;
}

/* ============= RESPONSIVE — MOBILE (max-width: 768px) ============= */
@media (max-width: 768px) {
  .header {
    padding: 1.5rem var(--content-padding-mobile);
  }

  .header-nav {
    display: none;
  }

  .burger-button {
    display: flex;
  }

  .page-hero {
    padding: var(--content-padding-mobile);
    min-height: 80vh;
  }

  .page-hero--inner {
    padding: var(--section-padding-mobile) var(--content-padding-mobile);
  }

  .section,
  .numbers-section,
  .services-section,
  .testimonial-section,
  .programs-section,
  .audiences-section,
  .methodology-section,
  .ladder-section,
  .upsell-chain,
  .stack-section,
  .metrics-section,
  .narrative-section,
  .experience-section,
  .approach-section,
  .expertise-section,
  .blog-section,
  .related-posts,
  .contact-section,
  .quiz-section {
    padding: var(--section-padding-mobile) var(--content-padding-mobile);
  }

  .cta-section {
    padding: var(--section-padding-mobile) var(--content-padding-mobile);
  }

  .article-header,
  .article-body,
  .series-nav {
    padding-left: var(--content-padding-mobile);
    padding-right: var(--content-padding-mobile);
  }

  .service-item {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

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

  .experience-item {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

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

  .ladder-step {
    grid-template-columns: 1fr;
  }

  .footer-content {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .upsell-flow {
    flex-direction: column;
  }

  .tab-buttons {
    flex-direction: column;
  }

  .tab-button {
    margin-right: 0;
    margin-bottom: -1px;
  }
}