/* ============================================================
   NEXORA LABS — Design System V2
   Conversion-focused. Dark theme. Gradient accents.
   ============================================================ */

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

/* ============================================================
   1. DESIGN TOKENS
   ============================================================ */
:root {
  /* Colors */
  --color-bg:          #0A0A0F;
  --color-surface:     #12121A;
  --color-surface-alt: #161622;
  --color-surface-hover: #1A1A28;
  --color-border:      #1E1E2E;
  --color-border-light:#2A2A3A;
  --color-text:        #F0F0F5;
  --color-text-muted:  #8888A0;
  --color-text-dim:    #55556A;
  --color-accent:      #6C5CE7;
  --color-accent-hover:#7B6EF6;
  --color-accent-glow: rgba(108, 92, 231, 0.15);
  --color-accent-2:    #A855F7;
  --color-success:     #00D68F;
  --color-cyan:        #22D3EE;

  /* Gradients */
  --gradient-accent:   linear-gradient(135deg, #6C5CE7, #A855F7);
  --gradient-accent-hover: linear-gradient(135deg, #7B6EF6, #B66FF8);
  --gradient-glow:     linear-gradient(135deg, rgba(108,92,231,0.2), rgba(168,85,247,0.2));
  --gradient-text:     linear-gradient(135deg, #F0F0F5, #A855F7);
  --gradient-subtle:   linear-gradient(180deg, rgba(108,92,231,0.06) 0%, transparent 100%);

  /* Typography */
  --font-family:    'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-h1:   clamp(2.5rem, 5.5vw, 3.75rem);
  --font-size-h2:   clamp(1.75rem, 3.5vw, 2.5rem);
  --font-size-h3:   clamp(1.125rem, 2vw, 1.5rem);
  --font-size-body:  1.0625rem;
  --font-size-small: 0.875rem;
  --font-size-label: 0.75rem;
  --line-height-tight:  1.1;
  --line-height-snug:   1.25;
  --line-height-normal: 1.7;

  /* Spacing (8px base) */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  1rem;
  --space-4:  1.5rem;
  --space-5:  2rem;
  --space-6:  3rem;
  --space-7:  4rem;
  --space-8:  6rem;
  --space-9:  7.5rem;

  /* Layout */
  --max-width:   1200px;
  --grid-gutter: 1.5rem;
  --page-margin: 5rem;
  --page-margin-mobile: 1.25rem;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-medium: 250ms ease;
  --transition-slow:   400ms ease-out;
}

/* ============================================================
   2. RESET & BASE
   ============================================================ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-body);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

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

a:hover { color: var(--color-accent-hover); }

img { max-width: 100%; display: block; }
ul, ol { list-style: none; }

::selection {
  background: rgba(108, 92, 231, 0.3);
  color: var(--color-text);
}

/* ============================================================
   3. TYPOGRAPHY
   ============================================================ */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text);
  font-weight: 600;
}

h1 {
  font-size: var(--font-size-h1);
  font-weight: 800;
  line-height: var(--line-height-tight);
  letter-spacing: -0.03em;
}

h2 {
  font-size: var(--font-size-h2);
  line-height: var(--line-height-snug);
  letter-spacing: -0.02em;
}

h3 {
  font-size: var(--font-size-h3);
  line-height: var(--line-height-snug);
}

p {
  color: var(--color-text-muted);
  max-width: 640px;
}

.text-gradient {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.eyebrow {
  font-size: var(--font-size-label);
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-3);
  display: block;
}

/* ============================================================
   4. LAYOUT
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--page-margin);
}

.section {
  padding: var(--space-9) 0;
  position: relative;
}

.section--tight {
  padding: var(--space-7) 0;
}

.section--glow {
  background: var(--gradient-subtle);
}

.grid {
  display: grid;
  gap: var(--grid-gutter);
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* ============================================================
   5. NAVIGATION
   ============================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 15, 0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-medium);
}

.nav.is-scrolled {
  background: rgba(10, 10, 15, 0.95);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--page-margin);
}

.nav__logo {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.nav__logo span {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.nav__link {
  font-size: var(--font-size-small);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  position: relative;
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-text);
}

.nav__link--active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-accent);
  border-radius: 1px;
}

.nav__cta {
  font-size: var(--font-size-small);
  font-weight: 600;
  padding: 8px 20px;
  background: var(--gradient-accent);
  color: #fff;
  border-radius: var(--radius-sm);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.nav__cta:hover {
  color: #fff;
  opacity: 0.9;
  transform: translateY(-1px);
}

/* Mobile Nav Toggle */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

.nav__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition-medium), opacity var(--transition-medium);
}

.nav__toggle.is-active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav__toggle.is-active span:nth-child(2) { opacity: 0; }
.nav__toggle.is-active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ============================================================
   6. HERO
   ============================================================ */
.hero {
  padding: calc(72px + var(--space-9)) 0 var(--space-8);
  min-height: 90vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(108,92,231,0.08) 0%, transparent 70%);
  pointer-events: none;
}

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

.hero__headline {
  margin-bottom: var(--space-4);
}

.hero__sub {
  font-size: 1.25rem;
  line-height: 1.6;
  margin-bottom: var(--space-5);
  max-width: 580px;
  color: var(--color-text-muted);
}

.hero__benefits {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.hero__benefit {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
}

.hero__benefit-icon {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  color: #fff;
  flex-shrink: 0;
}

.hero__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* ============================================================
   7. BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-family);
  font-size: var(--font-size-small);
  font-weight: 600;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn--primary {
  background: var(--gradient-accent);
  color: #fff;
  box-shadow: 0 4px 16px rgba(108, 92, 231, 0.25);
}

.btn--primary:hover {
  color: #fff;
  box-shadow: 0 8px 32px rgba(108, 92, 231, 0.35);
  transform: translateY(-2px);
}

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

.btn--outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: rgba(108, 92, 231, 0.05);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-muted);
  padding: 14px 0;
}

.btn--ghost:hover {
  color: var(--color-text);
}

.btn__arrow {
  transition: transform var(--transition-fast);
}

.btn:hover .btn__arrow {
  transform: translateX(3px);
}

/* ============================================================
   8. CARDS
   ============================================================ */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  transition: border-color var(--transition-medium), box-shadow var(--transition-medium), transform var(--transition-medium);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-accent);
  opacity: 0;
  transition: opacity var(--transition-medium);
}

.card:hover {
  border-color: var(--color-border-light);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  transform: translateY(-2px);
}

.card:hover::before {
  opacity: 1;
}

.card__icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--gradient-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
  font-size: 1.25rem;
}

.card__number {
  font-size: var(--font-size-label);
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.05em;
  margin-bottom: var(--space-3);
}

.card__title {
  font-size: var(--font-size-h3);
  margin-bottom: var(--space-2);
}

.card__text {
  font-size: var(--font-size-body);
  color: var(--color-text-muted);
  line-height: var(--line-height-normal);
}

.card__meta {
  margin-top: var(--space-4);
  font-size: var(--font-size-small);
  color: var(--color-text-dim);
}

.card__result {
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border);
  font-size: var(--font-size-small);
  font-weight: 600;
  color: var(--color-accent);
}

/* ============================================================
   9. METRICS
   ============================================================ */
.metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}

.metric {
  text-align: center;
  padding: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.metric__value {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
}

.metric__label {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  margin-top: var(--space-2);
}

/* ============================================================
   10. AUTOMATION GRID
   ============================================================ */
.auto-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  transition: border-color var(--transition-medium), background var(--transition-medium);
}

.auto-card:hover {
  border-color: var(--color-border-light);
  background: var(--color-surface-hover);
}

.auto-card__icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--gradient-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  flex-shrink: 0;
}

.auto-card__title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.auto-card__text {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* ============================================================
   11. SOCIAL PROOF / TRUST
   ============================================================ */
.trust-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.trust-tag {
  font-size: var(--font-size-label);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 6px 14px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  transition: border-color var(--transition-fast);
}

.trust-tag:hover {
  border-color: var(--color-border-light);
}

.trust-tag--accent {
  border-color: rgba(108, 92, 231, 0.3);
  color: var(--color-accent);
}

.tech-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
}

.tech-item {
  font-size: var(--font-size-small);
  font-weight: 500;
  color: var(--color-text-dim);
  padding: 10px 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.tech-item:hover {
  color: var(--color-text-muted);
  border-color: var(--color-border-light);
}

/* ============================================================
   12. CASE STUDY V2
   ============================================================ */
.case-study-v2 {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.case-study-v2__header {
  padding: var(--space-6) var(--space-6) var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.case-study-v2__eyebrow {
  font-size: var(--font-size-label);
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-3);
}

.case-study-v2__title {
  font-size: var(--font-size-h2);
  letter-spacing: -0.02em;
}

.case-study-v2__body {
  padding: var(--space-5) var(--space-6);
}

.case-study-v2__section {
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border);
}

.case-study-v2__section:last-child {
  border-bottom: none;
}

.case-study-v2__label {
  font-size: var(--font-size-label);
  font-weight: 600;
  color: var(--color-text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
}

.case-study-v2__text {
  color: var(--color-text-muted);
  line-height: var(--line-height-normal);
}

.case-study-v2__metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  padding: var(--space-5) var(--space-6);
  background: var(--color-surface-alt);
}

.case-study-v2__metric {
  text-align: center;
}

.case-study-v2__metric-value {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.case-study-v2__metric-label {
  font-size: var(--font-size-label);
  color: var(--color-text-dim);
  margin-top: var(--space-1);
}

/* ============================================================
   13. PROCESS
   ============================================================ */
.process {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.process__step {
  font-size: var(--font-size-small);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 8px 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.process__arrow {
  color: var(--color-text-dim);
  font-size: var(--font-size-small);
}

/* ============================================================
   14. FORMS
   ============================================================ */
.form {
  max-width: 560px;
}

.form__group {
  margin-bottom: var(--space-4);
}

.form__label {
  display: block;
  font-size: var(--font-size-small);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.form__input,
.form__select,
.form__textarea {
  width: 100%;
  font-family: var(--font-family);
  font-size: var(--font-size-body);
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

.form__input:focus,
.form__select:focus,
.form__textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.form__input::placeholder,
.form__textarea::placeholder {
  color: var(--color-text-dim);
}

.form__textarea {
  min-height: 140px;
  resize: vertical;
}

.form__select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%238888A0' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 44px;
}

.form__error {
  font-size: var(--font-size-label);
  color: #E74C3C;
  margin-top: var(--space-1);
  display: none;
}

.form__group--error .form__input,
.form__group--error .form__select,
.form__group--error .form__textarea {
  border-color: #E74C3C;
}

.form__group--error .form__error {
  display: block;
}

/* ============================================================
   15. CTA BANNER
   ============================================================ */
.cta-banner {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-7) var(--space-6);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-accent);
}

.cta-banner__title {
  font-size: var(--font-size-h2);
  margin-bottom: var(--space-3);
}

.cta-banner__sub {
  color: var(--color-text-muted);
  margin: 0 auto var(--space-5);
}

/* ============================================================
   16. PAGE HEADER
   ============================================================ */
.page-header {
  padding: calc(72px + var(--space-8)) 0 var(--space-7);
}

.page-header__title {
  margin-bottom: var(--space-3);
}

.page-header__sub {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  max-width: 520px;
}

/* ============================================================
   17. FOOTER
   ============================================================ */
.footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-7) 0;
}

.footer__inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-7);
}

.footer__brand {
  max-width: 320px;
}

.footer__logo {
  font-size: 1.125rem;
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.footer__logo span {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer__desc {
  font-size: var(--font-size-small);
  color: var(--color-text-dim);
  line-height: 1.6;
}

.footer__links {
  display: flex;
  gap: var(--space-7);
}

.footer__col-title {
  font-size: var(--font-size-label);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-3);
}

.footer__col a {
  display: block;
  font-size: var(--font-size-small);
  color: var(--color-text-dim);
  padding: 4px 0;
  transition: color var(--transition-fast);
}

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

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--space-6);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
}

.footer__copy {
  font-size: var(--font-size-small);
  color: var(--color-text-dim);
}

.footer__email {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
}

.footer__email:hover {
  color: var(--color-accent);
}

/* ============================================================
   18. SECTION HEADERS
   ============================================================ */
.section-header {
  margin-bottom: var(--space-7);
}

.section-header--center {
  text-align: center;
}

.section-header--center p {
  margin-left: auto;
  margin-right: auto;
}

.section-header__title {
  margin-bottom: var(--space-3);
}

.section-header__sub {
  color: var(--color-text-muted);
  max-width: 520px;
}

/* ============================================================
   19. STEPS
   ============================================================ */
.steps { counter-reset: step; }

.step {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: var(--space-4);
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--color-border);
}

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

.step__number {
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  opacity: 0.5;
}

.step__title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.step__text {
  font-size: var(--font-size-body);
  color: var(--color-text-muted);
  line-height: var(--line-height-normal);
  max-width: 560px;
}

/* ============================================================
   20. DISCIPLINE
   ============================================================ */
.discipline {
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-8) 0;
}

.discipline__header { margin-bottom: var(--space-7); }

.discipline__item-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.discipline__item-text {
  font-size: var(--font-size-body);
  color: var(--color-text-muted);
  line-height: var(--line-height-normal);
}

/* ============================================================
   21. SCROLL ANIMATIONS
   ============================================================ */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 500ms ease-out, transform 500ms ease-out;
}

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

.stagger > .fade-in:nth-child(1) { transition-delay: 0ms; }
.stagger > .fade-in:nth-child(2) { transition-delay: 100ms; }
.stagger > .fade-in:nth-child(3) { transition-delay: 200ms; }
.stagger > .fade-in:nth-child(4) { transition-delay: 300ms; }
.stagger > .fade-in:nth-child(5) { transition-delay: 400ms; }
.stagger > .fade-in:nth-child(6) { transition-delay: 500ms; }

/* ============================================================
   22. UTILITIES
   ============================================================ */
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); }
.mt-6 { margin-top: var(--space-6); }
.mt-7 { margin-top: var(--space-7); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-5 { margin-bottom: var(--space-5); }
.mb-7 { margin-bottom: var(--space-7); }
.text-center { text-align: center; }

/* ============================================================
   23. RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .container { padding: 0 var(--space-5); }
  .nav__inner { padding: 0 var(--space-5); }
  .hero { min-height: 75vh; }
  .case-study-v2__header { padding: var(--space-5); }
  .case-study-v2__body { padding: var(--space-4) var(--space-5); }
  .case-study-v2__metrics { padding: var(--space-4) var(--space-5); }
}

@media (max-width: 768px) {
  :root { --page-margin: var(--page-margin-mobile); }

  .container { padding: 0 var(--page-margin-mobile); }
  .nav__inner { padding: 0 var(--page-margin-mobile); }

  .nav__toggle { display: flex; }

  .nav__links {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--color-bg);
    padding: var(--space-4) var(--page-margin-mobile);
    transform: translateX(100%);
    transition: transform var(--transition-medium);
    border-top: 1px solid var(--color-border);
  }

  .nav__links.is-open { transform: translateX(0); }

  .nav__link {
    font-size: var(--font-size-body);
    padding: var(--space-3) 0;
    width: 100%;
    border-bottom: 1px solid var(--color-border);
  }

  .nav__link--active::after { display: none; }

  .nav__cta {
    width: 100%;
    text-align: center;
    margin-top: var(--space-3);
  }

  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: 1fr; }

  .hero {
    min-height: auto;
    padding: calc(72px + var(--space-7)) 0 var(--space-7);
  }

  .hero__sub { font-size: var(--font-size-body); }

  .hero__benefits { flex-direction: column; gap: var(--space-2); }

  .section { padding: var(--space-7) 0; }
  .section--tight { padding: var(--space-6) 0; }

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

  .step {
    grid-template-columns: 50px 1fr;
    gap: var(--space-3);
  }

  .step__number { font-size: 1.75rem; }

  .case-study-v2__metrics { grid-template-columns: 1fr; }
  .case-study-v2__header { padding: var(--space-4); }
  .case-study-v2__body { padding: var(--space-3) var(--space-4); }
  .case-study-v2__metrics { padding: var(--space-4); }

  .footer__inner { flex-direction: column; gap: var(--space-5); }
  .footer__links { flex-direction: column; gap: var(--space-5); }
  .footer__bottom { flex-direction: column; gap: var(--space-3); text-align: center; }

  .cta-banner { padding: var(--space-5) var(--space-4); }

  .process { flex-direction: column; align-items: flex-start; }
  .process__arrow { transform: rotate(90deg); }

  .page-header { padding: calc(72px + var(--space-6)) 0 var(--space-6); }
  .discipline { padding: var(--space-6) 0; }
  .discipline__header { margin-bottom: var(--space-5); }
}

@media (max-width: 400px) {
  .btn { width: 100%; justify-content: center; }
  .hero__actions { flex-direction: column; width: 100%; }
  .hero__actions .btn { width: 100%; }
}