/* PHI Solutions — Design Tokens & Component Styles */

/* ========================================
   DESIGN TOKENS
   ======================================== */

:root {
  /* Type Scale */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);

  /* Spacing (4px system) */
  --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;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
  --content-full: 100%;

  /* Font Families */
  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body: 'DM Sans', 'Helvetica Neue', sans-serif;
}

/* ========================================
   COLOR PALETTE — PHI Solutions Brand
   Navy + Steel Blue, Authoritative & Modern
   ======================================== */

:root, [data-theme="light"] {
  /* Surfaces */
  --color-bg:             #f5f7fa;
  --color-surface:        #ffffff;
  --color-surface-2:      #f0f4f8;
  --color-surface-offset: #e8edf3;
  --color-surface-offset-2: #dce3ed;
  --color-surface-dynamic: #d0d9e5;
  --color-divider:        #c8d1dc;
  --color-border:         #b8c4d2;

  /* Text */
  --color-text:           #1a2332;
  --color-text-muted:     #546478;
  --color-text-faint:     #8a96a6;
  --color-text-inverse:   #f5f7fa;

  /* Primary — Navy */
  --color-primary:        #1b3a5c;
  --color-primary-hover:  #142d48;
  --color-primary-active: #0f2136;
  --color-primary-highlight: #dce3ed;

  /* Accent — Steel Blue */
  --color-accent:         #3378bd;
  --color-accent-hover:   #2a6298;
  --color-accent-active:  #1f4e7d;
  --color-accent-light:   #e8f0f9;

  /* Secondary accent — Light blue */
  --color-secondary:      #68ade4;
  --color-secondary-hover: #4f9ad6;

  /* Success */
  --color-success:        #2e7d5b;
  --color-success-highlight: #d4e8df;

  /* Warning */
  --color-warning:        #b8860b;
  --color-warning-highlight: #f5ecd4;

  /* Error */
  --color-error:          #b03a3a;
  --color-error-highlight: #f5d8d8;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(27, 58, 92, 0.06);
  --shadow-md: 0 4px 12px rgba(27, 58, 92, 0.08);
  --shadow-lg: 0 12px 32px rgba(27, 58, 92, 0.12);
}

/* DARK MODE */
[data-theme="dark"] {
  --color-bg:             #0f1620;
  --color-surface:        #162030;
  --color-surface-2:      #1a2638;
  --color-surface-offset: #1e2c40;
  --color-surface-offset-2: #243448;
  --color-surface-dynamic: #2a3a50;
  --color-divider:        #2a3a50;
  --color-border:         #344860;

  --color-text:           #d0d8e4;
  --color-text-muted:     #8a96a8;
  --color-text-faint:     #5a6878;
  --color-text-inverse:   #1a2332;

  --color-primary:        #5a9ad4;
  --color-primary-hover:  #4888c4;
  --color-primary-active: #3a78b4;
  --color-primary-highlight: #1e2c40;

  --color-accent:         #68ade4;
  --color-accent-hover:   #4f9ad6;
  --color-accent-active:  #3a88c8;
  --color-accent-light:   #1e2c40;

  --color-secondary:      #7dbce8;
  --color-secondary-hover: #5aa8e0;

  --color-success:        #4aad7e;
  --color-warning:        #d4a832;
  --color-error:          #d45a5a;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:             #0f1620;
    --color-surface:        #162030;
    --color-surface-2:      #1a2638;
    --color-surface-offset: #1e2c40;
    --color-surface-offset-2: #243448;
    --color-surface-dynamic: #2a3a50;
    --color-divider:        #2a3a50;
    --color-border:         #344860;
    --color-text:           #d0d8e4;
    --color-text-muted:     #8a96a8;
    --color-text-faint:     #5a6878;
    --color-text-inverse:   #1a2332;
    --color-primary:        #5a9ad4;
    --color-primary-hover:  #4888c4;
    --color-primary-active: #3a78b4;
    --color-primary-highlight: #1e2c40;
    --color-accent:         #68ade4;
    --color-accent-hover:   #4f9ad6;
    --color-accent-active:  #3a88c8;
    --color-accent-light:   #1e2c40;
    --color-secondary:      #7dbce8;
    --color-secondary-hover: #5aa8e0;
    --color-success:        #4aad7e;
    --color-warning:        #d4a832;
    --color-error:          #d45a5a;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
  }
}

/* ========================================
   GLOBAL COMPONENTS
   ======================================== */

/* Container */
.container {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

@media (min-width: 768px) {
  .container { padding-inline: var(--space-8); }
}

/* ========================================
   SITE BANNER — Full-width identity strip
   ======================================== */

.site-banner {
  display: block;
  width: 100%;
  background: #ffffff;
  position: relative;
}

.site-banner a {
  display: block;
}

.site-banner__img {
  display: block;
  width: 100%;
  max-width: 800px;
  height: auto;
  margin: 0 auto;
  padding: var(--space-4) var(--space-4);
}

@media (min-width: 768px) {
  .site-banner__img {
    padding: var(--space-6) var(--space-8);
  }
}

[data-theme="dark"] .site-banner {
  background: var(--color-surface);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .site-banner {
    background: var(--color-surface);
  }
}

/* ========================================
   HEADER & NAVIGATION
   ======================================== */

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: oklch(from var(--color-bg) l c h / 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid oklch(from var(--color-text) l c h / 0.08);
  transition: box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.header--scrolled {
  box-shadow: var(--shadow-sm);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: center;
  padding-block: var(--space-2);
}

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

.header__logo img {
  height: 44px;
  width: auto;
}

.header__logo-text {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: var(--text-lg);
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

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

.nav__link {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: color var(--transition-interactive), background var(--transition-interactive);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-primary);
  background: var(--color-primary-highlight);
}

.nav__cta {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-5);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-inverse);
  background: var(--color-primary);
  text-decoration: none;
  border-radius: var(--radius-md);
  margin-left: var(--space-2);
}

.nav__cta:hover {
  background: var(--color-primary-hover);
}

/* Mobile nav toggle — positioned in top-right of banner */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-3);
  cursor: pointer;
  position: absolute;
  top: var(--space-3);
  right: var(--space-4);
  z-index: 110;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: var(--radius-md);
  border: 1px solid oklch(from var(--color-text) l c h / 0.1);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

.theme-toggle {
  padding: var(--space-2);
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-surface-offset);
}

@media (max-width: 1023px) {
  .nav-toggle { display: flex; }

  [data-theme="dark"] .nav-toggle {
    background: rgba(22, 32, 48, 0.85);
    border-color: var(--color-border);
  }

  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-4);
    box-shadow: var(--shadow-lg);
    gap: var(--space-1);
  }
  
  .nav--open { display: flex; }
  
  .nav__link {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
  }
  
  .nav__cta {
    width: 100%;
    justify-content: center;
    margin-left: 0;
    margin-top: var(--space-2);
    padding: var(--space-3) var(--space-4);
  }
}

/* ========================================
   HERO SECTIONS
   ======================================== */

.hero {
  padding: clamp(var(--space-16), 10vw, var(--space-32)) 0;
  position: relative;
  overflow: hidden;
}

.hero--home {
  background: linear-gradient(135deg, var(--color-primary) 0%, #0f2136 60%, #0a1828 100%);
  color: #ffffff;
  padding: clamp(var(--space-20), 12vw, var(--space-32)) 0;
}

.hero--home .hero__subtitle,
.hero--home .hero__description {
  color: rgba(255, 255, 255, 0.85);
}

.hero--page {
  background: var(--color-surface-2);
  padding: clamp(var(--space-12), 6vw, var(--space-20)) 0;
}



.hero__content {
  max-width: 720px;
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 400;
  line-height: 1.1;
  margin-bottom: var(--space-4);
  letter-spacing: -0.01em;
}

.hero--home .hero__title {
  font-size: var(--text-3xl);
}

.hero__subtitle {
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.hero__description {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 60ch;
  margin-bottom: var(--space-8);
}

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

/* ========================================
   BUTTONS
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  border: none;
  transition: all var(--transition-interactive);
}

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

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

.btn--secondary {
  background: transparent;
  color: var(--color-text-inverse);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn--secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
}

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

.btn--outline:hover {
  background: var(--color-primary-highlight);
  border-color: var(--color-primary);
}

/* ========================================
   SECTION STYLES
   ======================================== */

.section {
  padding: clamp(var(--space-12), 6vw, var(--space-24)) 0;
}

.section--alt {
  background: var(--color-surface-2);
}

.section__header {
  margin-bottom: clamp(var(--space-8), 4vw, var(--space-16));
}

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

.section__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.section__description {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 56ch;
  line-height: 1.7;
}

/* ========================================
   CARDS
   ======================================== */

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

.card-grid--2 { grid-template-columns: repeat(auto-fill, minmax(min(420px, 100%), 1fr)); }
.card-grid--3 { grid-template-columns: repeat(auto-fill, minmax(min(300px, 100%), 1fr)); }
.card-grid--4 { grid-template-columns: repeat(auto-fill, minmax(min(260px, 100%), 1fr)); }

.card {
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: box-shadow var(--transition-interactive), transform var(--transition-interactive);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card__icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-4);
  color: var(--color-accent);
}

.card__title {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.card__text {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.6;
}

.card__list {
  list-style: none;
  padding: 0;
  margin-top: var(--space-3);
}

.card__list li {
  padding: var(--space-1) 0;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  position: relative;
  padding-left: var(--space-5);
}

.card__list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
}

/* ========================================
   ABOUT / MISSION-VISION
   ======================================== */

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

@media (min-width: 768px) {
  .mission-grid { grid-template-columns: 1fr 1fr; }
}

.mission-card {
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
}

.mission-card__label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.mission-card__text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-text);
  line-height: 1.5;
  font-weight: 400;
}

/* Leader bio */
.leader {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  align-items: start;
}

@media (min-width: 768px) {
  .leader { grid-template-columns: 200px 1fr; }
}

.leader__photo {
  width: 200px;
  height: 200px;
  border-radius: var(--radius-xl);
  background: var(--color-surface-offset);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.leader__photo svg {
  width: 80px;
  height: 80px;
  color: var(--color-text-faint);
}

.leader__name {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.leader__title-role {
  font-size: var(--text-sm);
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: var(--space-4);
}

.leader__bio {
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ========================================
   PLAYBOOK
   ======================================== */

.playbook-phases {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-top: var(--space-8);
}

@media (min-width: 768px) {
  .playbook-phases { grid-template-columns: repeat(3, 1fr); }
}

.phase-card {
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.phase-card__label {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.phase-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.phase-card__plays {
  list-style: none;
  padding: 0;
}

.phase-card__plays li {
  padding: var(--space-2) 0;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  border-bottom: 1px solid oklch(from var(--color-text) l c h / 0.06);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.phase-card__plays li:last-child { border-bottom: none; }

.play-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: var(--color-accent-light);
  color: var(--color-accent);
  font-size: var(--text-xs);
  font-weight: 700;
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

/* Tools list */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(280px, 100%), 1fr));
  gap: var(--space-4);
  margin-top: var(--space-8);
}

.tool-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-md);
}

.tool-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-size: var(--text-xs);
  font-weight: 700;
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.tool-item__title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

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

/* Infographic */
.infographic-wrapper {
  margin-top: var(--space-8);
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-xl);
  overflow: hidden;
  padding: var(--space-4);
}

.infographic-wrapper img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

/* ========================================
   CASE STUDIES
   ======================================== */

.case-study {
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
}

.case-study__number {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}

.case-study__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.case-study__text {
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ========================================
   INSIGHTS
   ======================================== */

.insight-item {
  padding: var(--space-6) 0;
  border-bottom: 1px solid oklch(from var(--color-text) l c h / 0.08);
}

.insight-item:last-child { border-bottom: none; }

.insight-item__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.insight-item__meta {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ========================================
   CONTACT
   ======================================== */

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

@media (min-width: 768px) {
  .contact-grid { grid-template-columns: 1fr 1fr; }
}

.contact-info__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4) 0;
}

.contact-info__item svg {
  width: 24px;
  height: 24px;
  color: var(--color-accent);
  flex-shrink: 0;
  margin-top: 2px;
}

.contact-info__label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-1);
}

.contact-info__value {
  font-size: var(--text-base);
  color: var(--color-text);
}

.contact-info__value a {
  color: var(--color-accent);
  text-decoration: none;
}

.contact-info__value a:hover {
  text-decoration: underline;
}

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

.form-group label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  color: var(--color-text);
  transition: border-color var(--transition-interactive);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px oklch(from var(--color-accent) l c h / 0.12);
}

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

/* ========================================
   FOOTER
   ======================================== */

.footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.85);
  padding: var(--space-12) 0 var(--space-6);
}

.footer a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: color var(--transition-interactive);
}

.footer a:hover {
  color: #ffffff;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

@media (min-width: 768px) {
  .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
}

.footer__brand {
  max-width: 360px;
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.footer__logo img {
  height: 36px;
  width: auto;
  filter: brightness(0) invert(1);
}

.footer__logo-text {
  font-weight: 700;
  font-size: var(--text-lg);
  color: #ffffff;
}

.footer__description {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.6;
}

.footer__heading {
  font-size: var(--text-sm);
  font-weight: 700;
  color: #ffffff;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-4);
}

.footer__links {
  list-style: none;
  padding: 0;
}

.footer__links li {
  margin-bottom: var(--space-2);
}

.footer__links a {
  font-size: var(--text-sm);
}

.footer__bottom {
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--text-xs);
  color: rgba(255, 255, 255, 0.5);
}

/* ========================================
   CTA BANNER
   ======================================== */

.cta-banner {
  background: linear-gradient(135deg, var(--color-primary) 0%, #0f2136 100%);
  color: #ffffff;
  padding: clamp(var(--space-12), 6vw, var(--space-20)) 0;
  text-align: center;
}

.cta-banner__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  margin-bottom: var(--space-4);
}

.cta-banner__text {
  font-size: var(--text-base);
  color: rgba(255, 255, 255, 0.75);
  max-width: 48ch;
  margin: 0 auto var(--space-6);
}

.cta-banner .btn--primary {
  background: var(--color-accent);
  color: #ffffff;
}

.cta-banner .btn--primary:hover {
  background: var(--color-accent-hover);
}

/* ========================================
   AI FOR PUBLIC HEALTH PAGE
   ======================================== */

.ai-types-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .ai-types-grid { grid-template-columns: 1fr 1fr; }
}

.ai-type-card {
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.ai-type-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.ai-type-card__text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: var(--space-3);
}

.ai-type-card__examples {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-style: italic;
}

/* ========================================
   AI PAGE — In-Page Section Navigation
   ======================================== */

.ai-page-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: var(--space-4) 0;
  border-bottom: 1px solid oklch(from var(--color-text) l c h / 0.08);
}

.ai-page-nav__link {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  text-decoration: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  transition: all var(--transition-interactive);
}

.ai-page-nav__link:hover {
  color: var(--color-primary);
  background: var(--color-primary-highlight);
  border-color: var(--color-primary);
}

@media (max-width: 480px) {
  .ai-page-nav {
    gap: var(--space-2);
  }
  .ai-page-nav__link {
    font-size: var(--text-xs);
    padding: var(--space-2) var(--space-3);
  }
}

/* ========================================
   UTILITY CLASSES
   ======================================== */

.text-center { text-align: center; }
.text-left { text-align: left; }
.mx-auto { margin-inline: auto; }

/* ========================================
   WHITE PAPER PAGE
   ======================================== */

/* TOC + Key Findings grid */
.wp-toc-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .wp-toc-grid { grid-template-columns: 1fr 1fr; align-items: start; }
}

.wp-toc__nav { margin-top: var(--space-4); }

.wp-toc__list {
  padding: 0;
  margin: 0;
  list-style: none;
  counter-reset: toc;
}

.wp-toc__list li {
  counter-increment: toc;
  border-bottom: 1px solid oklch(from var(--color-text) l c h / 0.06);
}

.wp-toc__list li a {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: var(--text-sm);
  transition: color var(--transition-interactive);
}

.wp-toc__list li a::before {
  content: counter(toc, decimal-leading-zero);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-accent);
  min-width: 1.75em;
}

.wp-toc__list li a:hover {
  color: var(--color-primary);
}

/* Callout boxes */
.wp-callout {
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.wp-callout--inline {
  margin-top: var(--space-8);
}

.wp-callout__title {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.wp-callout__text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
}

.wp-callout__list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.wp-callout__list li {
  position: relative;
  padding: var(--space-2) 0 var(--space-2) var(--space-5);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

.wp-callout__list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.85em;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
}

.wp-callout__list li strong {
  color: var(--color-text);
}

/* Prose blocks */
.wp-prose {
  max-width: 72ch;
}

.wp-prose p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: var(--space-4);
}

.wp-prose p:last-child { margin-bottom: 0; }

.wp-prose__list {
  list-style: none;
  padding: 0;
  margin: var(--space-4) 0 0;
}

.wp-prose__list li {
  position: relative;
  padding: var(--space-3) 0 var(--space-3) var(--space-5);
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  border-bottom: 1px solid oklch(from var(--color-text) l c h / 0.06);
}

.wp-prose__list li:last-child { border-bottom: none; }

.wp-prose__list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 1.2em;
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 50%;
}

.wp-prose__list li strong {
  color: var(--color-text);
}

/* Tables */
.wp-table-wrapper {
  margin-top: var(--space-6);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-lg);
}

.wp-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.wp-table thead {
  background: var(--color-primary);
}

.wp-table th {
  color: #ffffff;
  font-weight: 600;
  text-align: left;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
}

.wp-table td {
  padding: var(--space-3) var(--space-4);
  color: var(--color-text-muted);
  border-bottom: 1px solid oklch(from var(--color-text) l c h / 0.06);
  line-height: 1.5;
  vertical-align: top;
}

.wp-table tr:last-child td { border-bottom: none; }

.wp-table tbody tr:hover {
  background: oklch(from var(--color-accent) l c h / 0.04);
}

.wp-table td:first-child {
  font-weight: 500;
  color: var(--color-text);
  white-space: nowrap;
}

@media (max-width: 640px) {
  .wp-table td:first-child { white-space: normal; }
}

/* Domain sections */
.wp-domain {
  padding: var(--space-8) 0;
  border-bottom: 1px solid oklch(from var(--color-text) l c h / 0.08);
}

.wp-domain:first-of-type { padding-top: var(--space-4); }
.wp-domain:last-of-type { border-bottom: none; }

.wp-domain__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

/* Evidence list */
.wp-evidence-list {
  margin-top: var(--space-6);
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}

.wp-evidence-list__title {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-3);
}

.wp-evidence-list ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.wp-evidence-list ul li {
  position: relative;
  padding: var(--space-2) 0 var(--space-2) var(--space-5);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}

.wp-evidence-list ul li::before {
  content: '\2713';
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: 700;
}

/* Subsection title */
.wp-subsection-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text);
  margin: var(--space-8) 0 var(--space-4);
}

/* Tier cards */
.wp-tiers {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .wp-tiers { grid-template-columns: repeat(3, 1fr); }
}

.wp-tier {
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.wp-tier__header {
  padding: var(--space-5) var(--space-5) var(--space-4);
  border-bottom: 1px solid oklch(from var(--color-text) l c h / 0.06);
}

.wp-tier__header--1 { background: oklch(from var(--color-success) l c h / 0.08); }
.wp-tier__header--2 { background: oklch(from var(--color-accent) l c h / 0.08); }
.wp-tier__header--3 { background: oklch(from var(--color-primary) l c h / 0.08); }

.wp-tier__badge {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--space-1);
}

.wp-tier__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.wp-tier__meta {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.wp-tier__list {
  list-style: none;
  padding: var(--space-4) var(--space-5);
  margin: 0;
}

.wp-tier__list li {
  position: relative;
  padding: var(--space-2) 0 var(--space-2) var(--space-5);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
  border-bottom: 1px solid oklch(from var(--color-text) l c h / 0.04);
}

.wp-tier__list li:last-child { border-bottom: none; }

.wp-tier__list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.9em;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
}

/* Key Findings card */
.wp-key-findings .wp-callout {
  height: 100%;
}

/* ========================================
   UTILITY CLASSES
   ======================================== */

/* Scroll reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  background: var(--color-primary);
  color: #ffffff;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  z-index: 200;
  text-decoration: none;
}

.skip-link:focus {
  top: var(--space-2);
}