/* ============================================================
   LOGOS — Design System
   Dark, premium, restrained research-lab visual language.
   System font stack — no external dependencies.
   ============================================================ */

/* -------------------------------------------------------
   1. CSS Custom Properties (Design Tokens)
   ------------------------------------------------------- */
:root {
  /* --- Surface --- */
  --color-canvas:         #0a0b0d;
  --color-surface:        #111317;
  --color-surface-raised: #181b20;
  --color-surface-high:   #1e2128;

  /* --- Text --- */
  --color-text-primary:   #e6e6ec;
  --color-text-secondary: #9a9faa;
  --color-text-tertiary:  #7e8490;
  --color-text-disabled:  #5a606b;

  /* --- Accent (muted gold / bronze) --- */
  --color-accent:          #c4a46c;
  --color-accent-hover:    #d4b87a;
  --color-accent-subtle:   rgba(196, 164, 108, 0.08);
  --color-accent-glow:     rgba(196, 164, 108, 0.15);

  /* --- Borders --- */
  --color-border-subtle:   rgba(255, 255, 255, 0.06);
  --color-border-default:  rgba(255, 255, 255, 0.09);
  --color-border-visible:  rgba(255, 255, 255, 0.14);

  /* --- Status (used sparingly) --- */
  --color-success:         #3b8c5a;
  --color-warning:         #c4a46c;
  --color-danger:          #8c4b3b;

  /* --- Typography --- */
  --font-stack:            -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;

  /* --- Spacing --- */
  --space-unit:            8px;
  --space-xs:              4px;
  --space-sm:              8px;
  --space-md:              16px;
  --space-lg:              24px;
  --space-xl:              32px;
  --space-2xl:             48px;
  --space-3xl:             64px;
  --space-4xl:             96px;
  --space-5xl:             128px;

  /* --- Section --- */
  --section-padding-y:     120px;
  --section-padding-y-mobile: 80px;

  /* --- Layout --- */
  --content-max-width:     1100px;
  --content-narrow:        780px;

  /* --- Radii --- */
  --radius-sm:             4px;
  --radius-md:             6px;
  --radius-lg:             8px;
  --radius-xl:             12px;

  /* --- Shadows (on dark: subtle light halos, not dark drops) --- */
  --shadow-card:           0 1px 0 rgba(255, 255, 255, 0.04),
                           0 0 0 1px rgba(255, 255, 255, 0.03);
  --shadow-elevated:       0 2px 8px rgba(0, 0, 0, 0.4),
                           0 0 0 1px rgba(255, 255, 255, 0.05);

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


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

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

body {
  font-family: var(--font-stack);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text-secondary);
  background: var(--color-canvas);
  overflow-x: hidden;
}

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

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

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

::selection {
  background: var(--color-accent-subtle);
  color: var(--color-text-primary);
}


/* -------------------------------------------------------
   3. Typography
   ------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text-primary);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.25rem, 5vw, 3.75rem);
  font-weight: 400;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 400;
  letter-spacing: -0.025em;
  margin-bottom: var(--space-lg);
}

h3 {
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: -0.015em;
  margin-bottom: var(--space-sm);
}

p {
  margin-bottom: var(--space-md);
}

p:last-child {
  margin-bottom: 0;
}

.text-large {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

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

.text-small {
  font-size: 0.8125rem;
  line-height: 1.55;
}

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


/* -------------------------------------------------------
   4. Layout Utilities
   ------------------------------------------------------- */

/* Skip-to-content link (visually hidden, focusable) */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 200;
  padding: 10px 20px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-canvas);
  background: var(--color-accent);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 10px;
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

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

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

.section {
  padding: var(--section-padding-y) 0;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

/* -------------------------------------------------------
   5. Navigation
   ------------------------------------------------------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 11, 13, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border-subtle);
  transition: background var(--transition-base);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.nav-brand {
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-text-primary);
  text-decoration: none;
}

.nav-brand span {
  color: var(--color-accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  list-style: none;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 450;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
  letter-spacing: -0.01em;
}

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

.nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 7px 18px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-canvas);
  background: var(--color-accent);
  border-radius: var(--radius-md);
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.nav-cta:hover {
  background: var(--color-accent-hover);
  color: var(--color-canvas);
  transform: translateY(-1px);
}

/* Mobile menu toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  cursor: pointer;
  padding: 0;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--color-text-secondary);
  border-radius: 1px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* Mobile menu */
.nav-mobile {
  display: none;
  position: fixed;
  top: 60px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-canvas);
  padding: var(--space-xl) var(--space-lg);
  z-index: 99;
  overflow-y: auto;
}

.nav-mobile.open {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.nav-mobile a {
  display: block;
  padding: 14px 0;
  font-size: 1.125rem;
  font-weight: 450;
  color: var(--color-text-secondary);
  text-decoration: none;
  border-bottom: 1px solid var(--color-border-subtle);
  transition: color var(--transition-fast);
}

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

.nav-mobile .nav-cta {
  display: inline-flex;
  justify-content: center;
  margin-top: var(--space-lg);
  padding: 14px 28px;
  font-size: 1rem;
}


/* -------------------------------------------------------
   6. Hero Section
   ------------------------------------------------------- */
.hero {
  position: relative;
  padding: 200px 0 140px;
  text-align: center;
  overflow: hidden;
}

/* Subtle radial glow behind hero */
.hero::before {
  content: "";
  position: absolute;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 700px;
  background: radial-gradient(ellipse at center, rgba(196, 164, 108, 0.04) 0%, transparent 70%);
  pointer-events: none;
}

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

.hero h1 {
  max-width: 800px;
  margin: 0 auto var(--space-lg);
}

.hero-subtitle {
  max-width: 600px;
  margin: 0 auto var(--space-2xl);
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 26px;
  font-family: var(--font-stack);
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition-fast),
              color var(--transition-fast),
              border-color var(--transition-fast),
              transform var(--transition-fast),
              box-shadow var(--transition-fast);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-canvas);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  color: var(--color-canvas);
  box-shadow: 0 4px 20px rgba(196, 164, 108, 0.2);
}

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

.btn-ghost:hover {
  border-color: var(--color-text-secondary);
  color: var(--color-text-primary);
  background: rgba(255, 255, 255, 0.02);
}


/* -------------------------------------------------------
   7. Section: Positioning
   ------------------------------------------------------- */
.positioning {
  border-top: 1px solid var(--color-border-subtle);
}

.positioning .text-large {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
}

.positioning-pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  margin-top: var(--space-3xl);
}

.pillar {
  text-align: center;
  padding: var(--space-lg);
}

.pillar-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-lg);
  background: var(--color-accent-subtle);
  color: var(--color-accent);
  font-size: 1.25rem;
  margin-bottom: var(--space-md);
}

.pillar h3 {
  margin-bottom: var(--space-sm);
}

.pillar p {
  font-size: 0.9375rem;
  color: var(--color-text-tertiary);
  line-height: 1.6;
}


/* -------------------------------------------------------
   8. Section: Method
   ------------------------------------------------------- */
.method {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border-subtle);
  border-bottom: 1px solid var(--color-border-subtle);
}

.method-intro {
  text-align: center;
  max-width: 620px;
  margin: 0 auto var(--space-4xl);
}

.method-flow {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
  flex-wrap: nowrap;
  position: relative;
}

.method-step {
  flex: 1;
  max-width: 180px;
  text-align: center;
  position: relative;
  padding: 0 var(--space-sm);
}

/* Connecting line between steps */
.method-step::after {
  content: "";
  position: absolute;
  top: 28px;
  left: calc(50% + 40px);
  width: calc(100% - 80px);
  height: 1px;
  background: var(--color-border-subtle);
}

.method-step:last-child::after {
  display: none;
}

.method-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--color-surface-high);
  border: 1px solid var(--color-border-default);
  color: var(--color-accent);
  font-size: 1.125rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-md);
  position: relative;
  z-index: 1;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.method-step:hover .method-step-num {
  border-color: var(--color-accent);
  background: var(--color-accent-subtle);
}

.method-step-label {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
}

.method-step-desc {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
  line-height: 1.5;
}

/* Arrow between steps (invisible on desktop, the line suffices) */
.method-arrow {
  display: none;
}

/* Expanded method step detail (used on method.html) */
.method-step-detail {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: var(--space-xl);
  align-items: start;
  max-width: 780px;
  margin: 0 auto;
}

.method-step-detail + .method-step-detail {
  margin-top: var(--space-3xl);
}

.method-step-detail .method-step-num {
  margin: 0;
}

.method-step-detail .text-large {
  color: var(--color-text-tertiary);
}

.method-step-detail .text-small {
  font-size: 0.9375rem;
  color: var(--color-text-tertiary);
  margin-top: var(--space-md);
}


/* -------------------------------------------------------
   9. Section: Research Intelligence (Cards)
   ------------------------------------------------------- */
.research-intro {
  text-align: center;
  max-width: 620px;
  margin: 0 auto var(--space-4xl);
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

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

.research-card:hover {
  border-color: var(--color-border-default);
  background: var(--color-surface-raised);
  transform: translateY(-2px);
}

.research-card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--color-accent-subtle);
  color: var(--color-accent);
  font-size: 1.125rem;
  margin-bottom: var(--space-md);
}

.research-card h3 {
  font-size: 1.0625rem;
  margin-bottom: var(--space-sm);
}

.research-card p {
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
  line-height: 1.6;
}

.research-card-tag {
  display: inline-block;
  margin-top: var(--space-md);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
}


/* -------------------------------------------------------
   10. Section: System Discipline
   ------------------------------------------------------- */
.discipline {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border-subtle);
  border-bottom: 1px solid var(--color-border-subtle);
}

.discipline-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}

.discipline-item {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
}

.discipline-marker {
  flex-shrink: 0;
  width: 3px;
  height: 100%;
  min-height: 48px;
  background: var(--color-accent);
  border-radius: 2px;
  opacity: 0.6;
  margin-top: 4px;
}

.discipline-item h3 {
  margin-bottom: var(--space-xs);
}

.discipline-item p {
  font-size: 0.9375rem;
  color: var(--color-text-tertiary);
  line-height: 1.6;
}


/* -------------------------------------------------------
   11. Section: LOGOS Organization
   ------------------------------------------------------- */
.org-intro {
  text-align: center;
  max-width: 620px;
  margin: 0 auto var(--space-4xl);
}

.org-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

.org-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  text-align: center;
  transition: border-color var(--transition-base),
              background var(--transition-base);
}

.org-card:hover {
  border-color: var(--color-border-default);
  background: var(--color-surface-raised);
}

.org-card-role {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.org-card-name {
  font-size: 1.0625rem;
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
}

.org-card-desc {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
  line-height: 1.5;
}


/* -------------------------------------------------------
   12. Section: Trust & Risk
   ------------------------------------------------------- */
.trust-risk {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border-subtle);
  border-bottom: 1px solid var(--color-border-subtle);
}

.risk-banner {
  max-width: 780px;
  margin: 0 auto;
  text-align: center;
  padding: var(--space-2xl);
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
}

.risk-banner h3 {
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

.risk-list {
  list-style: none;
  text-align: left;
  max-width: 520px;
  margin: 0 auto;
}

.risk-list li {
  position: relative;
  padding: var(--space-sm) 0 var(--space-sm) 24px;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
  border-bottom: 1px solid var(--color-border-subtle);
}

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

.risk-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  opacity: 0.5;
}


/* -------------------------------------------------------
   13. Section: Contact / Private Access
   ------------------------------------------------------- */
.contact {
  text-align: center;
}

.contact-intro {
  max-width: 560px;
  margin: 0 auto var(--space-2xl);
}

.contact-placeholder {
  max-width: 480px;
  margin: 0 auto;
  padding: var(--space-2xl);
  background: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
}

.contact-placeholder p {
  font-size: 0.9375rem;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-xl);
}

.contact-status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-tertiary);
  letter-spacing: 0.02em;
  margin-bottom: var(--space-xl);
}

.contact-status-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-text-disabled);
  flex-shrink: 0;
}

/* Visually hidden but screen-reader accessible */
.contact-label {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.contact-field {
  display: block;
  width: 100%;
  padding: 12px 16px;
  margin-bottom: var(--space-md);
  font-family: var(--font-stack);
  font-size: 0.9375rem;
  color: var(--color-text-primary);
  background: var(--color-canvas);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--transition-fast);
}

.contact-field::placeholder {
  color: var(--color-text-disabled);
}

.contact-field:focus {
  border-color: var(--color-accent);
}

.contact-placeholder .btn {
  width: 100%;
  margin-top: var(--space-sm);
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.contact-note {
  margin-top: var(--space-md);
  font-size: 0.75rem;
  color: var(--color-text-disabled);
  font-style: italic;
}


/* -------------------------------------------------------
   14. Footer
   ------------------------------------------------------- */
.footer {
  padding: var(--space-3xl) 0 var(--space-xl);
  border-top: 1px solid var(--color-border-subtle);
  text-align: center;
}

.footer-brand {
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.footer-brand span {
  color: var(--color-accent);
}

.footer-tagline {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-lg);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  list-style: none;
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
}

.footer-links a {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.footer-disclaimer {
  max-width: 600px;
  margin: 0 auto;
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  line-height: 1.6;
}


/* -------------------------------------------------------
   15. Subtle Section-Reveal Animation
   ------------------------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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


/* -------------------------------------------------------
   16. Responsive: Tablet (≤1024px)
   ------------------------------------------------------- */
@media (max-width: 1024px) {

  .method-flow {
    flex-wrap: wrap;
    gap: var(--space-lg);
    justify-content: center;
  }

  .method-step {
    flex: 0 0 calc(33.33% - var(--space-lg));
    max-width: calc(33.33% - var(--space-lg));
  }

  .method-step::after {
    display: none; /* connecting line too tight at this width */
  }

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

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

  .positioning-pillars {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
  }
}


/* -------------------------------------------------------
   17. Responsive: Mobile (≤768px)
   ------------------------------------------------------- */
@media (max-width: 768px) {

  .section {
    padding: var(--section-padding-y-mobile) 0;
  }

  /* Navigation */
  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  /* Hero */
  .hero {
    padding: 160px 0 100px;
  }

  .hero h1 {
    font-size: clamp(1.75rem, 7vw, 2.5rem);
    letter-spacing: -0.02em;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .hero-actions {
    flex-direction: column;
    gap: var(--space-sm);
  }

  .btn {
    width: 100%;
    max-width: 320px;
  }

  /* Positioning */
  .positioning-pillars {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .pillar {
    padding: var(--space-md) 0;
  }

  /* Method */
  .method-flow {
    flex-direction: column;
    align-items: center;
    gap: var(--space-lg);
  }

  .method-step {
    flex: 1;
    max-width: 240px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .method-step::after {
    display: none;
  }

  /* Vertical connector between stacked steps */
  .method-step:not(:last-child) .method-step-num::after {
    content: "";
    position: absolute;
    top: 56px;
    left: 50%;
    transform: translateX(-50%);
    width: 1px;
    height: 24px;
    background: var(--color-border-subtle);
  }

  /* Research */
  .research-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  /* Discipline */
  .discipline-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  /* Organization */
  .org-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-sm);
  }

  .org-card {
    padding: var(--space-md);
  }

  /* Trust */
  .risk-banner {
    padding: var(--space-xl);
  }

  /* Contact */
  .contact-placeholder {
    padding: var(--space-xl);
  }
}


/* -------------------------------------------------------
   18. Responsive: Small Mobile (≤480px)
   ------------------------------------------------------- */
@media (max-width: 480px) {

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

  .hero {
    padding: 140px 0 80px;
  }

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

  .research-card {
    padding: var(--space-lg);
  }

  .footer-links {
    flex-direction: column;
    gap: var(--space-sm);
  }
}