/* ============================================================
   GTR AI — styles.css
   Pure black & white. Syne + Inter. Refined, editorial.
   ============================================================ */

/* ----------------------------------------------------------
   CSS Custom Properties
   ---------------------------------------------------------- */
:root {
  --color-bg:        #000000;
  --color-surface:   #0D0D0D;
  --color-border:    #1F1F1F;
  --color-text:      #FFFFFF;
  --color-muted:     #666666;
  --color-accent:    #FFFFFF;
  --color-accent-dim:#FFFFFF14;

  --font-display: 'Syne', sans-serif;
  --font-body:    'Inter', sans-serif;

  --nav-h: 110px;
  --container: 1120px;
  --section-pad: clamp(80px, 10vw, 140px);

  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --transition: 0.2s ease;
}

/* ----------------------------------------------------------
   Light mode overrides
   ---------------------------------------------------------- */
[data-theme="light"] {
  --color-bg:        #FFFFFF;
  --color-surface:   #F5F5F5;
  --color-border:    #E4E4E4;
  --color-text:      #000000;
  --color-muted:     #777777;
  --color-accent:    #000000;
  --color-accent-dim:#00000010;
}

/* Invert logo (white → black) in light mode */
[data-theme="light"] .nav-logo img,
[data-theme="light"] .footer-logo img,
[data-theme="light"] .hero-bg-logo img,
[data-theme="light"] .about-monogram img {
  filter: invert(1);
}

/* Blend out any compositing artefacts on nav/footer logos */
[data-theme="light"] .nav-logo img,
[data-theme="light"] .footer-logo img {
  mix-blend-mode: multiply;
}

/* Hero ghosted logo blend mode */
[data-theme="light"] .hero-bg-logo img {
  mix-blend-mode: multiply;
}

[data-theme="light"] .about-monogram img {
  mix-blend-mode: multiply;
}

/* Nav scrolled */
[data-theme="light"] .nav-wrapper.scrolled {
  background: rgba(255, 255, 255, 0.9);
}

/* Mobile menu */
[data-theme="light"] .mobile-menu {
  background: rgba(255, 255, 255, 0.98);
}

/* Ghost button border */
[data-theme="light"] .btn-ghost {
  border-color: rgba(0, 0, 0, 0.2);
}

/* Hamburger border in light mode */
[data-theme="light"] .hamburger {
  border-color: rgba(0, 0, 0, 0.2);
}

/* Service card hover border */
[data-theme="light"] .service-card:hover::after {
  border-color: rgba(0, 0, 0, 0.12);
}

/* For-card hover */
[data-theme="light"] .for-card:hover {
  border-color: rgba(0, 0, 0, 0.15);
  background: rgba(0, 0, 0, 0.02);
}

/* Form inputs */
[data-theme="light"] .form-group input::placeholder,
[data-theme="light"] .form-group textarea::placeholder {
  color: #bbb;
}

[data-theme="light"] .form-group input:focus,
[data-theme="light"] .form-group textarea:focus {
  border-color: rgba(0, 0, 0, 0.35);
}

[data-theme="light"] .form-group input:invalid:not(:placeholder-shown),
[data-theme="light"] .form-group textarea:invalid:not(:placeholder-shown) {
  border-color: rgba(180, 0, 0, 0.4);
}

/* Case study outcome text */
[data-theme="light"] .example-outcome {
  color: rgba(0, 0, 0, 0.8);
}

/* Form messages */
[data-theme="light"] .form-success {
  border-color: rgba(0, 0, 0, 0.15);
}

[data-theme="light"] .form-error {
  color: rgba(160, 0, 0, 1);
  border-color: rgba(180, 0, 0, 0.25);
  background: rgba(180, 0, 0, 0.04);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

ul {
  list-style: none;
}

button {
  font-family: var(--font-body);
  cursor: pointer;
  border: none;
  background: none;
}

/* ----------------------------------------------------------
   Skip link
   ---------------------------------------------------------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 9999;
  padding: 8px 16px;
  background: var(--color-text);
  color: var(--color-bg);
  font-weight: 500;
  font-size: 0.875rem;
  border-radius: 2px;
  transition: top var(--transition);
}

.skip-link:focus {
  top: 16px;
}

/* ----------------------------------------------------------
   Container
   ---------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 60px);
}

/* ----------------------------------------------------------
   Buttons
   ---------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  border-radius: 2px;
  transition: background var(--transition), color var(--transition), border-color var(--transition), opacity var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-text);
  color: var(--color-bg);
  border: 1px solid var(--color-text);
}

.btn-primary:hover {
  background: transparent;
  color: var(--color-text);
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-text);
  background: var(--color-accent-dim);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border: 1px solid rgba(255,255,255,0.2);
}

.btn-ghost:hover {
  border-color: var(--color-text);
  background: var(--color-accent-dim);
}

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

/* ----------------------------------------------------------
   Navigation
   ---------------------------------------------------------- */
.nav-wrapper {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  transition: background var(--transition), backdrop-filter var(--transition), border-color var(--transition);
  border-bottom: 1px solid transparent;
}

.nav-wrapper.scrolled {
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom-color: var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  height: var(--nav-h);
  gap: 40px;
}

.nav-logo img {
  width: 100px;
  height: 100px;
  object-fit: contain;
}

.nav-links {
  display: flex;
  gap: 32px;
  margin-left: auto;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--color-muted);
  letter-spacing: 0.02em;
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--color-text);
}

.nav-cta {
  padding: 9px 22px;
  font-size: 0.875rem;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 2px;
  color: var(--color-muted);
  transition: color var(--transition), background var(--transition);
  flex-shrink: 0;
}

.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-accent-dim);
}

.icon-moon {
  display: none;
}

[data-theme="light"] .icon-sun {
  display: none;
}

[data-theme="light"] .icon-moon {
  display: block;
}

.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  margin-left: auto;
  padding: 8px;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  color: var(--color-text);
  flex-shrink: 0;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  border-radius: 1px;
  background: currentColor;
  transition: transform var(--transition), opacity var(--transition);
}

.hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Mobile menu */
.mobile-menu {
  background: rgba(0,0,0,0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  padding: 24px clamp(20px, 5vw, 60px) 32px;
}

.mobile-menu ul {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.mobile-menu a {
  font-size: 1.125rem;
  font-weight: 400;
  color: var(--color-muted);
  transition: color var(--transition);
}

.mobile-menu a:hover {
  color: var(--color-text);
}

.mobile-menu .btn {
  display: inline-flex;
  margin-top: 8px;
}

/* ----------------------------------------------------------
   Sections
   ---------------------------------------------------------- */
.section {
  padding-block: var(--section-pad);
}

.section-alt {
  background: var(--color-surface);
}

.section-header {
  margin-bottom: clamp(48px, 6vw, 80px);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.875rem, 4vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

/* ----------------------------------------------------------
   Hero
   ---------------------------------------------------------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-block: calc(var(--nav-h) + 60px) 80px;
  overflow: hidden;
}

.hero-bg-logo {
  position: absolute;
  right: -80px;
  top: 50%;
  transform: translateY(-50%);
  opacity: 0.12;
  pointer-events: none;
  user-select: none;
}

.hero-bg-logo img {
  width: 600px;
  height: 600px;
  object-fit: contain;
  mix-blend-mode: screen;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero-eyebrow {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 400;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: 24px;
}

.hero-heading {
  font-family: var(--font-display);
  font-size: clamp(3rem, 8vw, 6.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.0;
  margin-bottom: 28px;
}

.hero-sub {
  font-size: clamp(1rem, 2vw, 1.1875rem);
  font-weight: 300;
  color: var(--color-muted);
  max-width: 580px;
  line-height: 1.65;
  margin-bottom: 44px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ----------------------------------------------------------
   Services Grid
   ---------------------------------------------------------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
}

.service-card {
  background: var(--color-bg);
  padding: clamp(32px, 4vw, 52px);
  display: flex;
  flex-direction: column;
  gap: 20px;
  transition: background var(--transition);
  position: relative;
}

.service-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 1px solid transparent;
  transition: border-color var(--transition);
  pointer-events: none;
}

.service-card:hover {
  background: var(--color-surface);
}

.service-card:hover::after {
  border-color: rgba(255, 255, 255, 0.12);
}

.service-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: 2px;
  flex-shrink: 0;
  color: var(--color-text);
}

.service-title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.service-desc {
  font-size: 0.9375rem;
  color: var(--color-muted);
  line-height: 1.65;
  flex: 1;
}

/* ----------------------------------------------------------
   Why Grid
   ---------------------------------------------------------- */
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(32px, 5vw, 64px);
}

.why-item {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.why-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  flex-shrink: 0;
  color: var(--color-text);
}

.why-title {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

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

/* ----------------------------------------------------------
   About
   ---------------------------------------------------------- */
.about-layout {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: clamp(48px, 8vw, 100px);
  align-items: center;
}

.about-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.about-content .section-title {
  margin-bottom: 8px;
}

.about-text {
  font-size: 1rem;
  color: var(--color-muted);
  line-height: 1.75;
}

.about-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-monogram {
  opacity: 0.25;
}

.about-monogram img {
  width: 240px;
  height: 240px;
  object-fit: contain;
  mix-blend-mode: screen;
}

/* ----------------------------------------------------------
   Contact
   ---------------------------------------------------------- */
.contact-intro {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding-top: 8px;
  max-width: 560px;
}

.contact-intro .section-title {
  margin-bottom: 0;
}

.contact-book-btn {
  padding: 16px 40px;
  font-size: 1rem;
  align-self: flex-start;
  margin-top: 12px;
}

.contact-sub {
  font-size: 1rem;
  color: var(--color-muted);
  line-height: 1.7;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 8px;
}

.contact-email {
  font-weight: 400;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 2px;
  display: inline-block;
  transition: border-color var(--transition);
}

.contact-email:hover {
  border-color: var(--color-text);
}

.contact-location {
  font-size: 0.875rem;
  color: var(--color-muted);
}

/* Form */
.contact-form-wrap form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-size: 0.8125rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.required {
  color: var(--color-muted);
}

.form-group input,
.form-group textarea {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 2px;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 300;
  padding: 12px 16px;
  transition: border-color var(--transition);
  width: 100%;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: #333;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: rgba(255,255,255,0.4);
}

.form-group input:invalid:not(:placeholder-shown),
.form-group textarea:invalid:not(:placeholder-shown) {
  border-color: rgba(255,80,80,0.4);
}

.form-group textarea {
  resize: vertical;
  min-height: 140px;
}

.form-message {
  font-size: 0.9rem;
  padding: 14px 16px;
  border-radius: 2px;
}

.form-success {
  border: 1px solid rgba(255,255,255,0.15);
  color: var(--color-text);
  background: var(--color-accent-dim);
}

.form-error {
  border: 1px solid rgba(255,80,80,0.25);
  color: rgba(255,150,150,1);
  background: rgba(255,0,0,0.05);
}

.form-error a {
  text-decoration: underline;
  color: inherit;
}

/* ----------------------------------------------------------
   Footer
   ---------------------------------------------------------- */
.footer {
  border-top: 1px solid var(--color-border);
  padding-top: clamp(48px, 6vw, 72px);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 48px;
  align-items: start;
  padding-bottom: 48px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-logo img {
  width: 36px;
  height: 36px;
  object-fit: contain;
  border-radius: 3px;
}

.footer-wordmark {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.footer-tagline {
  font-size: 0.8125rem;
  color: var(--color-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.footer-nav ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-nav a {
  font-size: 0.875rem;
  color: var(--color-muted);
  transition: color var(--transition);
}

.footer-nav a:hover {
  color: var(--color-text);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-align: right;
}

.footer-contact a {
  font-size: 0.875rem;
  color: var(--color-muted);
  transition: color var(--transition);
}

.footer-contact a:hover {
  color: var(--color-text);
}

.footer-contact p {
  font-size: 0.8125rem;
  color: var(--color-muted);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-block: 20px;
}

.footer-bottom p {
  font-size: 0.8125rem;
  color: var(--color-muted);
}

/* ----------------------------------------------------------
   Section sub-heading
   ---------------------------------------------------------- */
.section-sub {
  font-size: 1rem;
  color: var(--color-muted);
  margin-top: 16px;
  max-width: 580px;
  line-height: 1.7;
}

/* ----------------------------------------------------------
   Who This Is For Grid
   ---------------------------------------------------------- */
.for-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(16px, 2vw, 24px);
}

.for-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: clamp(28px, 4vw, 44px);
  border: 1px solid var(--color-border);
  border-radius: 2px;
  transition: border-color var(--transition), background var(--transition);
}

.for-card:hover {
  border-color: rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.03);
}

.for-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: 2px;
  flex-shrink: 0;
  color: var(--color-text);
}

.for-title {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.for-desc {
  font-size: 0.9375rem;
  color: var(--color-muted);
  line-height: 1.65;
}

/* ----------------------------------------------------------
   Our Approach Steps
   ---------------------------------------------------------- */
.approach-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
}

.approach-step {
  background: var(--color-bg);
  padding: clamp(32px, 4vw, 52px);
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.approach-num {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.approach-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.approach-desc {
  font-size: 0.9375rem;
  color: var(--color-muted);
  line-height: 1.65;
}

/* ----------------------------------------------------------
   Stats / Results Grid
   ---------------------------------------------------------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  margin-bottom: 24px;
}

.stat-item {
  background: var(--color-bg);
  padding: clamp(28px, 3vw, 40px);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stat-number {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: 6px;
}

.stat-label {
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.stat-note {
  font-size: 0.8125rem;
  color: var(--color-muted);
  line-height: 1.5;
}

.stats-disclaimer {
  font-size: 0.8125rem;
  color: var(--color-muted);
  opacity: 0.6;
  line-height: 1.6;
  max-width: 620px;
}

/* ----------------------------------------------------------
   Case Studies / Examples Grid
   ---------------------------------------------------------- */
.examples-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
}

.example-card {
  background: var(--color-bg);
  padding: clamp(28px, 4vw, 52px);
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: background var(--transition);
}

.example-card:hover {
  background: var(--color-surface);
}

.example-tag {
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.example-title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.example-challenge {
  font-size: 0.9375rem;
  color: var(--color-muted);
  line-height: 1.65;
}

.example-outcome {
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.65;
  padding-top: 14px;
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}

/* ----------------------------------------------------------
   Products sub-section
   ---------------------------------------------------------- */
.products-sub {
  margin-top: clamp(64px, 8vw, 100px);
  padding-top: clamp(48px, 6vw, 72px);
  border-top: 1px solid var(--color-border);
}

.products-sub-header {
  margin-bottom: clamp(40px, 5vw, 64px);
}

.products-eyebrow {
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: 16px;
}

.products-heading {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(16px, 2vw, 24px);
}

.product-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: clamp(28px, 4vw, 44px);
  border: 1px solid var(--color-border);
  border-radius: 2px;
  transition: border-color var(--transition), background var(--transition);
}

.product-card:hover {
  border-color: rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.02);
}

.product-card--future {
  opacity: 0.45;
}

.product-card--future:hover {
  opacity: 0.6;
  border-color: var(--color-border);
  background: transparent;
}

.product-badge {
  font-size: 0.6875rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.product-name {
  font-family: var(--font-display);
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.product-desc {
  font-size: 0.9375rem;
  color: var(--color-muted);
  line-height: 1.65;
  flex: 1;
}

.product-hint {
  font-size: 0.8125rem;
  color: var(--color-muted);
  opacity: 0.55;
  font-style: italic;
}

.product-cta {
  align-self: flex-start;
  margin-top: 8px;
}

/* ----------------------------------------------------------
   Scroll reveal animations
   ---------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

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

/* Stagger children inside a grid/flex */
.services-grid .reveal:nth-child(2) { transition-delay: 0.1s; }
.services-grid .reveal:nth-child(3) { transition-delay: 0.15s; }
.services-grid .reveal:nth-child(4) { transition-delay: 0.25s; }
.why-grid .reveal:nth-child(2)      { transition-delay: 0.1s; }
.why-grid .reveal:nth-child(3)      { transition-delay: 0.2s; }
.for-grid .reveal:nth-child(2)      { transition-delay: 0.1s; }
.for-grid .reveal:nth-child(3)      { transition-delay: 0.15s; }
.for-grid .reveal:nth-child(4)      { transition-delay: 0.25s; }
.approach-steps .reveal:nth-child(2){ transition-delay: 0.1s; }
.approach-steps .reveal:nth-child(3){ transition-delay: 0.2s; }
.stats-grid .reveal:nth-child(2)    { transition-delay: 0.1s; }
.stats-grid .reveal:nth-child(3)    { transition-delay: 0.2s; }
.stats-grid .reveal:nth-child(4)    { transition-delay: 0.3s; }
.examples-grid .reveal:nth-child(2) { transition-delay: 0.1s; }
.examples-grid .reveal:nth-child(3) { transition-delay: 0.15s; }
.examples-grid .reveal:nth-child(4) { transition-delay: 0.25s; }
.products-grid .reveal:nth-child(2) { transition-delay: 0.1s; }

/* ----------------------------------------------------------
   Responsive
   ---------------------------------------------------------- */
@media (max-width: 960px) {
  .for-grid {
    grid-template-columns: 1fr;
  }

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

  .approach-steps {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .why-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-layout {
    grid-template-columns: 1fr;
  }

  .about-visual {
    display: none;
  }

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

  .footer-brand {
    grid-column: 1 / -1;
  }

  .footer-contact {
    text-align: left;
  }
}

/* Mobile theme toggle (inside hamburger menu) */
.mobile-menu-theme {
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
  margin-top: 4px;
}

.mobile-theme-toggle {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-muted);
  font-size: 0.875rem;
  font-family: var(--font-body);
  transition: color var(--transition);
  cursor: pointer;
}

.mobile-theme-toggle:hover {
  color: var(--color-text);
}

.mobile-theme-label {
  flex: 1;
}

@media (max-width: 680px) {
  :root {
    --nav-h: 72px;
  }

  .nav-links,
  .nav-cta {
    display: none;
  }

  /* Move theme toggle into hamburger menu on mobile */
  #theme-toggle {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .hero-heading {
    font-size: clamp(2.5rem, 12vw, 3.5rem);
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-contact {
    text-align: left;
  }
}

/* ----------------------------------------------------------
   Focus styles — accessibility
   ---------------------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--color-text);
  outline-offset: 3px;
  border-radius: 2px;
}