/* ============================================================
   UXResearcher.com — Main Stylesheet
   Design tokens, reset, components, layouts
   ============================================================ */

/* ============================================================
   1. DESIGN TOKENS
   ============================================================ */

:root {
  /* Colors */
  --color-bg:           #211B32;
  --color-bg-elevated:  #2A2145;
  --color-bg-card:      #2D2547;
  --color-bg-light:     #FEFDEA;
  --color-purple:       #8A47FB;
  --color-purple-hover: #7535F0;
  --color-purple-light: rgba(138, 71, 251, 0.12);
  --color-purple-mid:   rgba(138, 71, 251, 0.3);
  --color-text-primary: #FEFDEA;
  --color-text-secondary: rgba(254, 253, 234, 0.65);
  --color-text-muted:   rgba(254, 253, 234, 0.4);
  --color-border:       rgba(254, 253, 234, 0.1);
  --color-border-purple: rgba(138, 71, 251, 0.35);

  /* Typography */
  --font-main: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --size-xs:   0.75rem;   /* 12px */
  --size-sm:   0.875rem;  /* 14px */
  --size-base: 1rem;      /* 16px */
  --size-md:   1.125rem;  /* 18px */
  --size-lg:   1.25rem;   /* 20px */
  --size-xl:   1.5rem;    /* 24px */
  --size-2xl:  1.875rem;  /* 30px */
  --size-3xl:  2.25rem;   /* 36px */
  --size-4xl:  3rem;      /* 48px */
  --size-5xl:  3.75rem;   /* 60px */
  --size-6xl:  4.5rem;    /* 72px */

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Layout */
  --max-width:        1200px;
  --max-width-narrow: 720px;
  --max-width-wide:   1400px;
  --nav-height:       72px;
  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  20px;
  --radius-pill: 100px;

  /* Transitions */
  --transition-base: 180ms ease;
  --transition-slow: 300ms ease;

  /* Shadows */
  --shadow-card: 0 2px 16px rgba(0,0,0,0.25);
  --shadow-elevated: 0 8px 40px rgba(0,0,0,0.35);
}

/* ============================================================
   2. RESET & BASE
   ============================================================ */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-main);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

button, input, textarea, select {
  font: inherit;
  border: none;
  outline: none;
  background: none;
}

button {
  cursor: pointer;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.02em;
}

p {
  line-height: 1.7;
}

/* ============================================================
   3. LAYOUT
   ============================================================ */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container--narrow {
  max-width: var(--max-width-narrow);
}

.container--wide {
  max-width: var(--max-width-wide);
}

section {
  padding: var(--space-20) 0;
}

.section--sm {
  padding: var(--space-12) 0;
}

.section--lg {
  padding: var(--space-32) 0;
}

/* ============================================================
   4. NAVIGATION
   ============================================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  background-color: rgba(33, 27, 50, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-base);
}

.nav__inner {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
  text-decoration: none;
}

.nav__logo-icon {
  width: 34px;
  height: auto;
  flex-shrink: 0;
}

.nav__logo-wordmark {
  font-size: var(--size-md);
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.nav__logo-byline {
  font-size: var(--size-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  margin-top: 1px;
  white-space: nowrap;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex: 1;
  justify-content: center;
}

.nav__link {
  font-size: var(--size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-pill);
  transition: color var(--transition-base), background-color var(--transition-base);
  white-space: nowrap;
}

.nav__link:hover {
  color: var(--color-text-primary);
  background-color: rgba(254, 253, 234, 0.06);
}

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

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.nav__researcher-link {
  font-size: var(--size-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-base);
  white-space: nowrap;
}

.nav__researcher-link:hover {
  color: var(--color-text-secondary);
}

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  cursor: pointer;
  background: none;
  border: none;
}

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

.nav__hamburger.is-active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__hamburger.is-active span:nth-child(2) {
  opacity: 0;
}

.nav__hamburger.is-active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile nav */
.nav__mobile {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-bg);
  padding: var(--space-8) var(--space-6);
  z-index: 99;
  overflow-y: auto;
  border-top: 1px solid var(--color-border);
}

.nav__mobile.is-open {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.nav__mobile-link {
  font-size: var(--size-lg);
  font-weight: 600;
  color: var(--color-text-secondary);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border);
  transition: color var(--transition-base);
}

.nav__mobile-link:hover {
  color: var(--color-text-primary);
}

.nav__mobile-actions {
  margin-top: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

/* ============================================================
   5. BUTTONS
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-size: var(--size-sm);
  font-weight: 600;
  line-height: 1;
  border-radius: var(--radius-pill);
  padding: var(--space-3) var(--space-6);
  transition: all var(--transition-base);
  cursor: pointer;
  white-space: nowrap;
  letter-spacing: -0.01em;
}

.btn--primary {
  background-color: var(--color-purple);
  color: #fff;
  border: 2px solid var(--color-purple);
}

.btn--primary:hover {
  background-color: var(--color-purple-hover);
  border-color: var(--color-purple-hover);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(138, 71, 251, 0.35);
}

.btn--outline {
  background-color: transparent;
  color: var(--color-text-primary);
  border: 2px solid var(--color-border);
}

.btn--outline:hover {
  border-color: rgba(254, 253, 234, 0.3);
  background-color: rgba(254, 253, 234, 0.05);
}

.btn--outline-purple {
  background-color: transparent;
  color: var(--color-purple);
  border: 2px solid var(--color-purple);
}

.btn--outline-purple:hover {
  background-color: var(--color-purple-light);
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-text-secondary);
  border: 2px solid transparent;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

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

.btn--sm {
  font-size: var(--size-xs);
  padding: var(--space-2) var(--space-4);
}

.btn--lg {
  font-size: var(--size-base);
  padding: var(--space-4) var(--space-8);
}

.btn--xl {
  font-size: var(--size-md);
  padding: var(--space-5) var(--space-10);
}

.btn--full {
  width: 100%;
}

/* ============================================================
   6. HERO
   ============================================================ */

.hero {
  padding-top: calc(var(--nav-height) + var(--space-20));
  padding-bottom: var(--space-24);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(138, 71, 251, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--size-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-purple);
  background-color: var(--color-purple-light);
  border: 1px solid var(--color-border-purple);
  border-radius: var(--radius-pill);
  padding: var(--space-2) var(--space-4);
  margin-bottom: var(--space-6);
}

.hero__heading {
  font-size: var(--size-5xl);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-6);
  color: var(--color-text-primary);
}

.hero__heading em {
  font-style: normal;
  color: var(--color-purple);
}

.hero__body {
  font-size: var(--size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-10);
  max-width: 480px;
  line-height: 1.65;
}

.hero__actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.hero__trust {
  margin-top: var(--space-10);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.hero__trust-label {
  font-size: var(--size-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.hero__trust-clients {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.hero__trust-client {
  font-size: var(--size-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  transition: color var(--transition-base);
}

.hero__trust-client:hover {
  color: var(--color-text-secondary);
}

.hero__image {
  position: relative;
}

.hero__image img {
  width: 100%;
  border-radius: var(--radius-lg);
  object-fit: cover;
}

/* Interior page hero (narrower) */
.hero--page {
  padding-top: calc(var(--nav-height) + var(--space-16));
  padding-bottom: var(--space-16);
}

.hero--page .hero__inner {
  grid-template-columns: 1fr;
  max-width: 760px;
}

.hero--page .hero__heading {
  font-size: var(--size-4xl);
}

/* ============================================================
   7. SECTION HEADERS
   ============================================================ */

.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
}

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

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--size-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-purple);
  margin-bottom: var(--space-4);
}

.section-heading {
  font-size: var(--size-4xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-text-primary);
  margin-bottom: var(--space-5);
}

.section-body {
  font-size: var(--size-lg);
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-width: 600px;
  margin: 0 auto;
}

.section-header--left .section-body {
  margin: 0;
}

/* ============================================================
   8. CARDS
   ============================================================ */

.card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  transition: border-color var(--transition-base), transform var(--transition-base);
}

.card:hover {
  border-color: var(--color-border-purple);
  transform: translateY(-2px);
}

.card__icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-5);
  display: flex;
  align-items: center;
  justify-content: center;
}

.card__kicker {
  font-size: var(--size-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-purple);
  margin-bottom: var(--space-3);
}

.card__title {
  font-size: var(--size-xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}

.card__body {
  font-size: var(--size-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-6);
}

.card__link {
  font-size: var(--size-sm);
  font-weight: 600;
  color: var(--color-purple);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  transition: gap var(--transition-base);
}

.card__link:hover {
  gap: var(--space-3);
}

.card__link::after {
  content: '→';
}

/* ============================================================
   9. GRIDS
   ============================================================ */

.grid {
  display: grid;
  gap: var(--space-6);
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--auto { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }

/* ============================================================
   10. PROOF / TRUST SECTIONS
   ============================================================ */

.proof-section {
  background-color: var(--color-bg-elevated);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-12) 0;
}

.proof-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.proof-bar__label {
  font-size: var(--size-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  flex-shrink: 0;
}

.proof-bar__divider {
  width: 1px;
  height: 16px;
  background: var(--color-border);
  flex-shrink: 0;
}

.proof-bar__clients {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  flex-wrap: wrap;
  justify-content: center;
}

.proof-bar__client {
  font-size: var(--size-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: -0.01em;
}

/* Stat blocks */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-8);
}

.stat {
  text-align: center;
}

.stat__number {
  font-size: var(--size-4xl);
  font-weight: 800;
  color: var(--color-purple);
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: var(--space-2);
}

.stat__label {
  font-size: var(--size-sm);
  color: var(--color-text-secondary);
  font-weight: 500;
  line-height: 1.4;
}

/* ============================================================
   11. CTA BLOCKS
   ============================================================ */

.cta-block {
  background: linear-gradient(135deg, var(--color-bg-card) 0%, var(--color-bg-elevated) 100%);
  border: 1px solid var(--color-border-purple);
  border-radius: var(--radius-lg);
  padding: var(--space-16) var(--space-12);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-block::before {
  content: '';
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(138, 71, 251, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.cta-block__kicker {
  font-size: var(--size-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-purple);
  margin-bottom: var(--space-4);
}

.cta-block__heading {
  font-size: var(--size-3xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-5);
}

.cta-block__body {
  font-size: var(--size-lg);
  color: var(--color-text-secondary);
  max-width: 520px;
  margin: 0 auto var(--space-10);
  line-height: 1.65;
}

.cta-block__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

/* ============================================================
   12. CONTENT / PROSE
   ============================================================ */

.prose {
  color: var(--color-text-secondary);
  line-height: 1.75;
}

.prose h2 {
  font-size: var(--size-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-top: var(--space-12);
  margin-bottom: var(--space-5);
  letter-spacing: -0.025em;
}

.prose h3 {
  font-size: var(--size-xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-top: var(--space-10);
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}

.prose p {
  margin-bottom: var(--space-5);
  font-size: var(--size-md);
}

.prose ul, .prose ol {
  margin-bottom: var(--space-5);
  padding-left: var(--space-6);
}

.prose ul li, .prose ol li {
  list-style: disc;
  margin-bottom: var(--space-3);
  font-size: var(--size-md);
}

.prose ol li {
  list-style: decimal;
}

.prose strong {
  color: var(--color-text-primary);
  font-weight: 600;
}

.prose blockquote {
  border-left: 3px solid var(--color-purple);
  padding-left: var(--space-6);
  margin: var(--space-8) 0;
  font-size: var(--size-lg);
  font-style: italic;
  color: var(--color-text-primary);
}

/* ============================================================
   13. TAGS / CHIPS
   ============================================================ */

.tag {
  display: inline-flex;
  align-items: center;
  font-size: var(--size-xs);
  font-weight: 600;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-pill);
  background-color: var(--color-bg-elevated);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  letter-spacing: 0.02em;
}

.tag--purple {
  background-color: var(--color-purple-light);
  color: var(--color-purple);
  border-color: var(--color-border-purple);
}

/* ============================================================
   14. BREADCRUMBS
   ============================================================ */

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-bottom: var(--space-6);
}

.breadcrumb__item {
  font-size: var(--size-sm);
  color: var(--color-text-muted);
}

.breadcrumb__item a {
  color: var(--color-text-muted);
  transition: color var(--transition-base);
}

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

.breadcrumb__separator {
  color: var(--color-text-muted);
  font-size: var(--size-xs);
}

/* ============================================================
   15. DIVIDERS & DECORATIVE
   ============================================================ */

.divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-16) 0;
}

.purple-bar {
  width: 48px;
  height: 3px;
  background-color: var(--color-purple);
  border-radius: 2px;
  margin-bottom: var(--space-5);
}

/* ============================================================
   16. LIST WITH CHECKS
   ============================================================ */

.check-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.check-list__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
}

.check-list__icon {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  background-color: var(--color-purple-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

.check-list__icon::after {
  content: '✓';
  font-size: 12px;
  color: var(--color-purple);
  font-weight: 700;
}

.check-list__text {
  font-size: var(--size-base);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.check-list__text strong {
  color: var(--color-text-primary);
}

/* ============================================================
   17. FORMS
   ============================================================ */

.form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: var(--size-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
}

.form-input,
.form-textarea,
.form-select {
  background-color: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  font-size: var(--size-base);
  color: var(--color-text-primary);
  transition: border-color var(--transition-base);
  width: 100%;
}

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

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-muted);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
  line-height: 1.6;
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23FEFDEA' stroke-opacity='0.4' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-4) center;
  padding-right: var(--space-10);
}

/* ============================================================
   18. FOOTER
   ============================================================ */

.footer {
  background-color: var(--color-bg-elevated);
  border-top: 1px solid var(--color-border);
  padding: var(--space-16) 0 var(--space-10);
}

.footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.footer__brand {
  max-width: 280px;
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.footer__logo-icon {
  width: 28px;
  height: auto;
}

.footer__logo-name {
  font-size: var(--size-md);
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.footer__tagline {
  font-size: var(--size-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
  margin-bottom: var(--space-6);
}

.footer__col-title {
  font-size: var(--size-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-5);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__link {
  font-size: var(--size-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-base);
}

.footer__link:hover {
  color: var(--color-text-primary);
}

.footer__bottom {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-8);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer__copyright {
  font-size: var(--size-sm);
  color: var(--color-text-muted);
}

.footer__bottom-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.footer__bottom-link {
  font-size: var(--size-sm);
  color: var(--color-text-muted);
  transition: color var(--transition-base);
}

.footer__bottom-link:hover {
  color: var(--color-text-secondary);
}

/* ============================================================
   19. UTILITY CLASSES
   ============================================================ */

.text-purple { color: var(--color-purple); }
.text-muted  { color: var(--color-text-muted); }
.text-secondary { color: var(--color-text-secondary); }

.text-center { text-align: center; }
.text-left   { text-align: left; }

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border-width: 0;
}

.visually-hidden {
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  height: 1px;
  overflow: hidden;
  position: absolute;
  white-space: nowrap;
  width: 1px;
}

/* ============================================================
   20. SPECIFIC COMPONENT: TWO-COLUMN SPLIT
   ============================================================ */

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.split--reverse .split__media {
  order: -1;
}

.split__content {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.split__media {
  position: relative;
}

/* ============================================================
   21. PROCESS STEPS
   ============================================================ */

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-6);
  counter-reset: step-counter;
}

.step {
  position: relative;
  padding: var(--space-6);
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  counter-increment: step-counter;
}

.step::before {
  content: counter(step-counter, decimal-leading-zero);
  font-size: var(--size-xs);
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--color-purple);
  display: block;
  margin-bottom: var(--space-4);
}

.step__title {
  font-size: var(--size-lg);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
  letter-spacing: -0.02em;
}

.step__body {
  font-size: var(--size-sm);
  color: var(--color-text-secondary);
  line-height: 1.65;
}

/* ============================================================
   22. HIGHLIGHT BOX
   ============================================================ */

.highlight-box {
  background-color: var(--color-purple-light);
  border: 1px solid var(--color-border-purple);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
}

.highlight-box__heading {
  font-size: var(--size-lg);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
}

.highlight-box__body {
  font-size: var(--size-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ============================================================
   23. TESTIMONIALS (placeholder layout for future)
   ============================================================ */

.testimonial {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
}

.testimonial__quote {
  font-size: var(--size-lg);
  color: var(--color-text-primary);
  line-height: 1.65;
  margin-bottom: var(--space-6);
  font-style: italic;
}

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

.testimonial__name {
  font-size: var(--size-sm);
  font-weight: 700;
  color: var(--color-text-primary);
}

.testimonial__role {
  font-size: var(--size-xs);
  color: var(--color-text-muted);
}

/* ============================================================
   24. ENGAGEMENT MODELS TABLE (hire page)
   ============================================================ */

.engagement-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-8) 0;
}

.engagement-table th,
.engagement-table td {
  text-align: left;
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-border);
  font-size: var(--size-sm);
}

.engagement-table th {
  font-weight: 700;
  font-size: var(--size-xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  background-color: var(--color-bg-elevated);
}

.engagement-table td {
  color: var(--color-text-secondary);
  vertical-align: top;
}

.engagement-table td:first-child {
  font-weight: 600;
  color: var(--color-text-primary);
}

.engagement-table tr:hover td {
  background-color: rgba(254, 253, 234, 0.02);
}

/* ============================================================
   25. RESPONSIVE
   ============================================================ */

@media (max-width: 1024px) {
  .hero__heading {
    font-size: var(--size-4xl);
  }

  .hero__inner {
    gap: var(--space-12);
  }

  .footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 64px;
  }

  .container {
    padding: 0 var(--space-5);
  }

  section {
    padding: var(--space-16) 0;
  }

  /* Nav */
  .nav__links,
  .nav__researcher-link {
    display: none;
  }

  .nav__hamburger {
    display: flex;
  }

  /* Hero */
  .hero {
    padding-top: calc(var(--nav-height) + var(--space-12));
    padding-bottom: var(--space-16);
  }

  .hero__inner {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }

  .hero__image {
    order: -1;
  }

  .hero__heading {
    font-size: var(--size-3xl);
  }

  .hero__body {
    font-size: var(--size-base);
  }

  .hero--page .hero__heading {
    font-size: var(--size-3xl);
  }

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

  .split {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }

  .split--reverse .split__media {
    order: 0;
  }

  /* Section headers */
  .section-heading {
    font-size: var(--size-2xl);
  }

  /* CTA block */
  .cta-block {
    padding: var(--space-12) var(--space-6);
  }

  .cta-block__heading {
    font-size: var(--size-2xl);
  }

  /* Footer */
  .footer__inner {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .footer__brand {
    max-width: 100%;
  }

  .footer__bottom {
    flex-direction: column;
    text-align: center;
  }

  /* Steps */
  .steps {
    grid-template-columns: 1fr;
  }

  /* Buttons */
  .btn--xl {
    font-size: var(--size-base);
    padding: var(--space-4) var(--space-8);
  }

  /* Engagement table */
  .engagement-table {
    font-size: var(--size-xs);
  }

  .engagement-table th,
  .engagement-table td {
    padding: var(--space-3) var(--space-4);
  }
}

@media (max-width: 480px) {
  .hero__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero__actions .btn {
    text-align: center;
  }

  .hero__heading {
    font-size: var(--size-2xl);
  }

  .cta-block__actions {
    flex-direction: column;
    align-items: stretch;
  }
}

/* ============================================================
   26. PRINT
   ============================================================ */

@media print {
  .nav,
  .nav__mobile,
  .cta-block {
    display: none;
  }

  body {
    background: white;
    color: black;
  }
}

/* ============================================================
   27. FOCUS / ACCESSIBILITY
   ============================================================ */

:focus-visible {
  outline: 2px solid var(--color-purple);
  outline-offset: 3px;
  border-radius: 3px;
}

/* ============================================================
   28. SCROLLBAR (subtle dark)
   ============================================================ */

::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--color-bg-card);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(138, 71, 251, 0.3);
}