/* ============================================
   Marathon AI — Website Design System
   Bold type, warm tones, modern consulting
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');

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

:root {
  --navy: #1B2A4A;
  --navy-dark: #0F1A2E;
  --navy-light: #243656;
  --blue: #3B82F6;
  --blue-bright: #60A5FA;
  --blue-deep: #1E40AF;
  --cream: #F5F0EB;
  --cream-dark: #EDE7E0;
  --white: #FFFFFF;
  --black: #0A0A0A;
  --gray-100: #F1F5F9;
  --gray-200: #E2E8F0;
  --gray-300: #CBD5E1;
  --gray-400: #94A3B8;
  --gray-500: #64748B;
  --gray-600: #475569;
  --gray-800: #1E293B;
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 1400px;
  --transition: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --gutter: clamp(1.5rem, 4vw, 4rem);
}

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

body {
  font-family: var(--font-main);
  color: var(--black);
  line-height: 1.5;
  background: var(--cream);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  max-width: 100vw;
}

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

a:hover { opacity: 0.7; }

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-main);
  font-weight: 900;
  line-height: 0.95;
  color: var(--navy);
  letter-spacing: -0.04em;
}

h1 {
  font-size: clamp(3rem, 8vw, 7rem);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.04em;
  text-transform: uppercase;
}

h2 {
  font-size: clamp(2rem, 5vw, 4rem);
  letter-spacing: -0.03em;
  line-height: 1;
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

h4 {
  font-size: 1.25rem;
  font-weight: 700;
}

p {
  color: var(--gray-600);
  font-size: clamp(1rem, 1.5vw, 1.25rem);
  line-height: 1.6;
  max-width: 600px;
}

p.large {
  font-size: clamp(1.125rem, 2vw, 1.5rem);
  line-height: 1.5;
}

.text-upper {
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-size: 0.8rem;
  font-weight: 700;
}

.accent {
  color: var(--blue);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 2.5rem;
  font-size: 0.9rem;
  font-weight: 700;
  border-radius: 100px;
  border: 2px solid var(--black);
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-main);
  background: transparent;
  color: var(--black);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.btn:hover {
  background: var(--navy);
  color: var(--white);
  border-color: var(--navy);
  opacity: 1;
}

.btn-light {
  border-color: var(--white);
  color: var(--white);
}

.btn-light:hover {
  background: var(--white);
  color: var(--navy);
  border-color: var(--white);
}

.btn-filled {
  background: var(--navy);
  color: var(--white);
  border-color: var(--navy);
}

.btn-filled:hover {
  background: var(--blue-deep);
  border-color: var(--blue-deep);
}

.btn-blue {
  background: var(--blue);
  color: var(--white);
  border-color: var(--blue);
}

.btn-blue:hover {
  background: var(--blue-deep);
  border-color: var(--blue-deep);
}

.btn .arrow {
  transition: transform var(--transition);
  font-size: 1.2em;
}
.btn:hover .arrow {
  transform: translateX(4px);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1.5rem 0;
  transition: all 0.3s ease;
}

.nav.scrolled {
  background: var(--navy-dark);
  padding: 1rem 0;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  z-index: 1001;
}

.nav-logo img {
  height: 36px;
  width: auto;
  background: #fff;
  border-radius: 6px;
  padding: 2px;
}

.nav-logo span {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  color: var(--white);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--white);
  transition: width var(--transition);
}

.nav-links a:hover { opacity: 1; }
.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-diagnostic {
  background: rgba(59,130,246,0.15);
  padding: 0.5rem 1.25rem;
  border-radius: 100px;
  border: 1px solid rgba(59,130,246,0.3);
  color: var(--blue-bright) !important;
}

.nav-diagnostic:hover {
  background: rgba(59,130,246,0.25);
  opacity: 1;
}

.nav-cta {
  background: rgba(255,255,255,0.1);
  padding: 0.5rem 1.25rem;
  border-radius: 100px;
  border: 1px solid rgba(255,255,255,0.2);
}

.nav-cta:hover {
  background: rgba(255,255,255,0.2);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
  flex-direction: column;
  gap: 5px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  transition: all 0.3s ease;
}

/* --- Hero Section --- */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 8rem 0 6rem;
  background: var(--navy);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 80%;
  height: 150%;
  background: radial-gradient(ellipse, rgba(59, 130, 246, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--blue-bright);
  margin-bottom: 2rem;
}

.hero h1 {
  color: var(--white);
  margin-bottom: 2rem;
}

.hero p {
  color: rgba(255,255,255,0.6);
  font-size: clamp(1.125rem, 2vw, 1.5rem);
  line-height: 1.5;
  max-width: 560px;
  margin-bottom: 3rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* --- Block Sections --- */
.block {
  padding: clamp(5rem, 12vh, 10rem) 0;
}

.block-navy {
  background: var(--navy);
  color: var(--white);
}

.block-navy h2,
.block-navy h3,
.block-navy h4,
.block-navy p {
  color: var(--white);
}

.block-navy p {
  color: rgba(255,255,255,0.7);
}

.block-blue {
  background: var(--blue);
  color: var(--white);
}

.block-blue h2,
.block-blue h3,
.block-blue p {
  color: var(--white);
}

.block-blue p {
  color: rgba(255,255,255,0.85);
}

.block-cream {
  background: var(--cream);
}

.block-white {
  background: var(--white);
}

/* --- Section Label --- */
.section-label {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--gray-500);
  margin-bottom: 3rem;
}

.block-navy .section-label,
.block-blue .section-label {
  color: rgba(255,255,255,0.5);
}

/* --- Diagnostic CTA Banner --- */
.diagnostic-banner {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  padding: clamp(2.5rem, 5vw, 4rem);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 3rem;
  align-items: center;
}

.diagnostic-banner h3 {
  margin-bottom: 1rem;
}

.diagnostic-banner p {
  font-size: 1rem;
  max-width: 500px;
}

.diagnostic-stats {
  display: flex;
  gap: 2rem;
  margin-top: 1.5rem;
}

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

.diagnostic-stat .number {
  font-size: 2rem;
  font-weight: 900;
  color: var(--navy);
  line-height: 1;
}

.diagnostic-stat .label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--gray-500);
  margin-top: 0.25rem;
}

/* --- Services Grid --- */
.services-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

.service-item {
  padding: clamp(2.5rem, 5vw, 4rem);
  border-bottom: 1px solid rgba(255,255,255,0.1);
  transition: background var(--transition);
  position: relative;
}

.service-item:nth-child(odd) {
  border-right: 1px solid rgba(255,255,255,0.1);
}

.service-item:last-child:nth-child(odd) {
  border-right: none;
}

.service-item:hover {
  background: rgba(255,255,255,0.05);
}

.service-number {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--blue-bright);
  letter-spacing: 0.1em;
  margin-bottom: 1.5rem;
  display: block;
}

.service-item h3 {
  margin-bottom: 1.25rem;
  color: var(--white);
}

.service-item p {
  font-size: 1rem;
  color: rgba(255,255,255,0.6);
  max-width: 380px;
}

/* --- Services List (homepage compact layout) --- */
.services-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.services-list-item {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 0.25rem 2rem;
  padding: clamp(1.5rem, 3vw, 2.25rem) 0;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  align-items: baseline;
}

.services-list-item .service-number {
  margin-bottom: 0;
  grid-row: 1 / 3;
}

.services-list-item h3 {
  color: var(--white);
  margin-bottom: 0;
}

.services-list-item p {
  color: rgba(255,255,255,0.6);
  font-size: 1rem;
  margin: 0;
  max-width: 560px;
}

/* --- Process / Approach --- */
.process-row {
  display: flex;
  gap: 0;
  border-top: 2px solid var(--navy);
}

.process-item {
  flex: 1;
  padding: 2.5rem 2rem;
  border-right: 1px solid rgba(27, 42, 74, 0.15);
}

.process-item:last-child {
  border-right: none;
}

.process-number {
  font-size: 3rem;
  font-weight: 900;
  color: var(--navy);
  opacity: 0.15;
  line-height: 1;
  margin-bottom: 1rem;
}

.process-item h4 {
  margin-bottom: 0.75rem;
  color: var(--navy);
}

.process-item p {
  font-size: 0.95rem;
}

/* --- Statement / Big Text --- */
.statement {
  padding: clamp(6rem, 15vh, 12rem) 0;
}

.statement-text {
  font-size: clamp(2rem, 4.5vw, 4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--navy);
  max-width: 900px;
}

.statement-text .accent {
  color: var(--blue);
}

/* --- About / Team --- */
.about-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(3rem, 6vw, 8rem);
  align-items: center;
}

.about-split h3 {
  margin-bottom: 1.5rem;
}

.about-split p {
  margin-bottom: 1.25rem;
}

.team-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 4vw, 4rem);
}

.team-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  padding: clamp(2rem, 3vw, 3rem);
  transition: all var(--transition);
}

.team-card:hover {
  border-color: var(--blue);
  box-shadow: 0 8px 30px rgba(27, 42, 74, 0.08);
}

.team-photo {
  width: 100%;
  height: 300px;
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: 1.5rem;
  background: var(--gray-100);
}

.team-photo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.team-card .role {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--blue);
  margin-bottom: 0.75rem;
}

.team-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.team-card p {
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
}

.team-quote {
  font-size: 0.9rem;
  font-style: italic;
  color: var(--gray-600);
  border-left: 3px solid var(--blue-bright);
  margin: 1.25rem 0 0.5rem;
  padding: 0.5rem 0 0.5rem 1rem;
  line-height: 1.6;
}

.team-card .credentials {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.25rem;
}

.team-card .credentials span {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  background: var(--gray-100);
  border-radius: 100px;
  color: var(--gray-600);
  white-space: nowrap;
}

/* --- Values --- */
.values-item {
  padding: 1.5rem 0;
  border-bottom: 1px solid rgba(27, 42, 74, 0.12);
}

.values-item:first-child {
  border-top: 1px solid rgba(27, 42, 74, 0.12);
}

.values-item h4 {
  margin-bottom: 0.5rem;
}

.values-item p {
  font-size: 1rem;
}

.values-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1rem;
}

.values-list li {
  display: flex;
  gap: 0.75rem;
  font-size: 1rem;
  color: var(--gray-600);
  line-height: 1.6;
}

.values-list .icon {
  color: var(--blue);
  font-weight: 700;
  flex-shrink: 0;
}

/* --- Case Study / Work --- */
.case-hero {
  background: var(--navy);
  padding: clamp(10rem, 20vh, 16rem) 0 clamp(4rem, 8vh, 6rem);
}

.case-hero h1 {
  color: var(--white);
  font-size: clamp(2.5rem, 6vw, 5rem);
}

.case-meta {
  display: flex;
  gap: 3rem;
  margin-top: 2rem;
}

.case-meta-item .label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: rgba(255,255,255,0.4);
}

.case-meta-item .value {
  font-size: 1rem;
  font-weight: 600;
  color: var(--white);
  margin-top: 0.25rem;
}

.case-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  margin-top: 3rem;
  padding-top: 3rem;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.case-stat .number {
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 900;
  color: var(--blue-bright);
  line-height: 1;
}

.case-stat .label {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
  margin-top: 0.5rem;
  line-height: 1.4;
}

.case-body {
  padding: clamp(4rem, 8vh, 6rem) 0;
}

.case-section {
  margin-bottom: 4rem;
}

.case-section h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  margin-bottom: 1.5rem;
}

.case-section p {
  margin-bottom: 1.25rem;
  max-width: 720px;
}

.deliverables-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.deliverable-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 8px;
  padding: 2rem;
}

.deliverable-card h4 {
  margin-bottom: 0.75rem;
  font-size: 1.1rem;
}

.deliverable-card p {
  font-size: 0.95rem;
  max-width: none;
}

/* --- Contact --- */
.contact-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(3rem, 6vw, 8rem);
}

.contact-info h3 {
  margin-bottom: 1.5rem;
}

.contact-info p {
  margin-bottom: 2.5rem;
}

.contact-detail {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: 2rem;
}

.contact-detail .label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-weight: 700;
  color: var(--gray-500);
}

.contact-detail .value {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--navy);
}

.contact-detail .value a { color: var(--navy); }

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--navy);
}

.form-group input,
.form-group textarea,
.form-group select {
  padding: 1rem 0;
  border: none;
  border-bottom: 2px solid rgba(27, 42, 74, 0.15);
  font-size: 1.125rem;
  font-family: var(--font-main);
  background: transparent;
  color: var(--navy);
  transition: border-color var(--transition);
  border-radius: 0;
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--blue);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--gray-400);
}

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

.form-group select {
  -webkit-appearance: none;
  cursor: pointer;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

/* --- Page Header (inner pages) --- */
.page-hero {
  background: var(--navy);
  padding: clamp(10rem, 20vh, 14rem) 0 clamp(4rem, 8vh, 6rem);
}

.page-hero h1 {
  color: var(--white);
  font-size: clamp(2.5rem, 6vw, 5rem);
}

.page-hero p {
  color: rgba(255,255,255,0.6);
  margin-top: 2rem;
  max-width: 500px;
}

/* --- Service Detail Blocks --- */
.service-detail-block {
  padding: clamp(4rem, 8vh, 6rem) 0;
  border-bottom: 1px solid rgba(27, 42, 74, 0.1);
}

.service-detail-block:last-of-type {
  border-bottom: none;
}

.service-detail-split {
  display: grid;
  grid-template-columns: clamp(3rem, 5vw, 5rem) 1fr;
  gap: 0 clamp(1.5rem, 3vw, 2.5rem);
}

.service-detail-split > .service-number {
  padding-top: 0.35rem;
}

.service-detail-split h3 {
  margin-bottom: 1.5rem;
  font-size: clamp(1.75rem, 3vw, 2.25rem);
}

.service-detail-split .service-number {
  color: var(--blue);
}

.service-detail-split p {
  margin-bottom: 1rem;
  max-width: 680px;
}

.deliverables {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.deliverables li {
  font-size: 1rem;
  color: var(--gray-600);
  padding-left: 1.25rem;
  position: relative;
}

.deliverables li::before {
  content: '\2192';
  position: absolute;
  left: 0;
  color: var(--blue);
  font-weight: 700;
}

.case-spotlight {
  margin-top: 2rem;
  padding: 1.5rem 1.75rem;
  background: var(--gray-50, #f9fafb);
  border-left: 3px solid var(--blue-bright);
  border-radius: 0 8px 8px 0;
}

.case-spotlight-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--blue-bright);
  margin-bottom: 0.75rem;
}

.case-spotlight p {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--gray-600);
  margin: 0;
}

/* --- CTA Block --- */
.cta-block {
  text-align: center;
  padding: clamp(6rem, 15vh, 10rem) 0;
}

.cta-block h2 {
  margin-bottom: 1.5rem;
}

.cta-block p {
  margin: 0 auto 2.5rem;
}

/* --- Diagnostic Page --- */
.diagnostic-page {
  background: var(--cream);
  min-height: 100vh;
}

.diagnostic-embed {
  max-width: 760px;
  margin: 0 auto;
  padding: 2rem var(--gutter) 6rem;
}

/* --- Footer --- */
.footer {
  background: var(--navy-dark);
  padding: clamp(4rem, 8vh, 6rem) 0 2rem;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 4rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.footer-logo img {
  height: 32px;
  background: #fff;
  border-radius: 6px;
  padding: 2px;
}

.footer-logo span {
  color: var(--white);
  font-weight: 800;
  font-size: 1.1rem;
}

.footer-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.footer-links a {
  color: rgba(255,255,255,0.5);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--white);
  opacity: 1;
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(255,255,255,0.08);
  color: rgba(255,255,255,0.3);
  font-size: 0.8rem;
}

/* --- Fade in animation --- */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 900px) {
  .services-grid {
    grid-template-columns: 1fr;
  }
  .service-item:nth-child(odd) {
    border-right: none;
  }
  .services-list-item {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
  .process-row {
    flex-direction: column;
  }
  .process-item {
    border-right: none;
    border-bottom: 1px solid rgba(27, 42, 74, 0.15);
  }
  .process-item:last-child {
    border-bottom: none;
  }
  .team-grid {
    grid-template-columns: 1fr;
  }
  .case-stats {
    grid-template-columns: 1fr 1fr;
  }
  .diagnostic-banner {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav {
    background: var(--navy-dark);
    padding: 1rem 0;
  }
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--navy-dark);
    padding: 6rem var(--gutter) 2rem;
    gap: 1.5rem;
    z-index: 1000;
  }
  .nav-links.open a {
    font-size: 2rem;
    font-weight: 800;
  }
  .nav-toggle { display: flex; }

  .about-split,
  .contact-split {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .footer-top {
    flex-direction: column;
    gap: 2rem;
  }

  .hero {
    padding: 6rem 0 4rem;
    min-height: 80vh;
  }

  .case-meta {
    flex-direction: column;
    gap: 1.5rem;
  }

  .case-stats {
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }

  .diagnostic-stats {
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
  }
}

/* --- Hero Name (Marathon AI — Critical Mass style massive headline) --- */
.hero-name {
  display: block;
  font-family: var(--font-main);
  font-weight: 900;
  font-size: clamp(4rem, 11.5vw, 14rem);
  line-height: 0.85;
  letter-spacing: -0.05em;
  text-transform: uppercase;
  color: var(--white);
  margin-bottom: 2rem;
  overflow-wrap: break-word;
  word-break: break-word;
}

.hero-tagline {
  font-size: clamp(1.5rem, 3.5vw, 3rem);
  color: var(--white);
  text-transform: uppercase;
  margin-bottom: 2rem;
}

/* --- Work Page Cards --- */
.work-card {
  background: var(--white);
  border-radius: 12px;
  padding: 3rem;
  margin-bottom: 2.5rem;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

.work-card .section-label {
  margin-bottom: 0.5rem;
}

.work-card h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 1.25rem;
}

.work-card > p {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--gray-600);
  max-width: 640px;
}

.work-results {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--gray-200);
}

.work-results h4 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--navy);
  margin-bottom: 1rem;
}

.work-results ul {
  list-style: none;
  padding: 0;
}

.work-results li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.65rem;
  font-size: 0.95rem;
  color: var(--gray-600);
  line-height: 1.6;
}

.work-results li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--blue);
}

@media (max-width: 768px) {
  .work-card {
    padding: 2rem 1.5rem;
  }

  .hero-name {
    font-size: clamp(3rem, 10vw, 5rem);
  }

  .hero-tagline {
    font-size: clamp(1.25rem, 4vw, 2rem);
  }

  .page-hero h1 {
    word-break: break-word;
  }

  .nav-inner {
    padding: 0;
  }

  section, .block, .service-detail-block {
    overflow-x: hidden;
  }
}