/* ==========================================================================
   MMDT-RISE — Clean Foundation Design System
   Precision-Engineered from Raspberry Pi Foundation Design Tokens & Live DOM
   Primary Brand Accent: MMDT Gold (#FFC100)
   Grounding Contrast: Deep Midnight Slate (#0F172A)
   ========================================================================== */

:root {
  /* Brand Identity */
  --color-primary: #FFC100;
  --color-primary-hover: #E5AC00;
  --color-on-primary: #0F172A;

  /* Action & Link Layer (Grounding High-Contrast) */
  --color-action: #0F172A;
  --color-action-hover: #1E293B;
  --color-link: #0284C7;

  /* Neutrals & Surfaces (Light Mode) */
  --color-canvas: #FFFFFF;
  --color-subsurface: #F8FAFC;
  --color-surface: #FFFFFF;
  --color-surface-hover: #F1F5F9;
  --color-border: #E2E8F0;
  --color-border-subtle: #F1F5F9;

  /* Typography Colors */
  --color-text-main: #0F172A;
  --color-text-muted: #475569;
  --color-text-subtle: #94A3B8;

  /* Typography Stack */
  --font-sans: 'Inter', 'Noto Sans Myanmar', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-myanmar: 'Noto Sans Myanmar', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'Space Mono', SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --container-width: 1160px;

  /* Radii (Extracted from raspberrypi.org-design.md) */
  --radius-xs: 4px;
  --radius-sm: 6px;   /* Buttons (matching Raspberry Pi rounded.md: 5px) */
  --radius-md: 8px;   /* Cards (matching Raspberry Pi rounded.lg: 8px) */
  --radius-lg: 16px;  /* Enclosed split blocks */
  --radius-full: 9999px; /* Chips / Tags only */

  /* Spacing Rhythm (8px, 16px, 30px, 48px, 64px) */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 30px;
  --space-lg: 48px;
  --space-xl: 64px;

  /* Elevation (Subtle & Flat) */
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 8px -2px rgba(0, 0, 0, 0.05);

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

/* Dark Mode Tokens */
[data-theme="dark"] {
  --color-canvas: #0B0F17;
  --color-subsurface: #111827;
  --color-surface: #161F2E;
  --color-surface-hover: #1E293B;
  --color-border: #1E293B;
  --color-border-subtle: #161F2E;

  --color-text-main: #F8FAFC;
  --color-text-muted: #94A3B8;
  --color-text-subtle: #64748B;
  --color-action: #F8FAFC;
  --color-action-hover: #FFFFFF;
  --color-link: #38BDF8;

  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 10px -2px rgba(0, 0, 0, 0.5);
}

/* ==========================================================================
   Base & Reset
   ========================================================================== */
*, *::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-sans);
  background-color: var(--color-canvas);
  color: var(--color-text-main);
  line-height: 1.6;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Myanmar Unicode Typography Optimization (Noto Sans Myanmar) */
html[lang="my"],
html[lang="my"] body,
html[lang="my"] button,
html[lang="my"] input,
html[lang="my"] select,
html[lang="my"] textarea {
  font-family: var(--font-myanmar);
  letter-spacing: normal;
}

html[lang="my"] body {
  line-height: 1.8;
}

html[lang="my"] h1,
html[lang="my"] h2,
html[lang="my"] h3,
html[lang="my"] h4,
html[lang="my"] .hero-title,
html[lang="my"] .section-title,
html[lang="my"] .article-master-title,
html[lang="my"] .rpf-card-title,
html[lang="my"] .action-title {
  line-height: 1.65 !important;
  letter-spacing: normal;
}

html[lang="my"] .hero-subtitle,
html[lang="my"] .section-subtitle,
html[lang="my"] .hero-description,
html[lang="my"] .action-subtitle,
html[lang="my"] .action-card-text,
html[lang="my"] .team-bio,
html[lang="my"] .rpf-card-body {
  line-height: 1.85 !important;
}

/* Accessibility Focus Ring (WCAG 2.4.7 AA) */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

main {
  flex: 1 0 auto;
}

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

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

.skip-link {
  position: absolute;
  top: -100px;
  left: 20px;
  background: var(--color-primary);
  color: var(--color-on-primary);
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  z-index: 1000;
  font-weight: 700;
}

.skip-link:focus {
  top: 15px;
}

/* ==========================================================================
   Layout Containers
   ========================================================================== */
.container {
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
  width: 100%;
}

.section {
  padding-top: var(--space-xl);
  padding-bottom: var(--space-xl);
}

/* ==========================================================================
   Navigation Header
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition);
}

[data-theme="dark"] .site-header {
  background-color: rgba(11, 15, 23, 0.94);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.site-header__main {
  display: flex;
  align-items: center;
  gap: 36px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif !important;
}

.logo-img {
  height: 38px;
  width: auto;
}

.logo-title {
  font-weight: 800;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif !important;
  letter-spacing: -0.02em;
}

.brand-mmdt {
  color: var(--color-text-main);
  font-weight: 800;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif !important;
}

.brand-rise {
  color: var(--color-primary);
  font-weight: 800;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif !important;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 26px;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-muted);
  position: relative;
  padding: 6px 0;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text-main);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: var(--radius-full);
}

/* Nav Dropdown */
.nav-item-dropdown {
  position: relative;
}

.nav-dropdown-toggle {
  background: none;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: inherit;
}

.dropdown-caret {
  font-size: 0.75rem;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: 8px 0;
  min-width: 210px;
  list-style: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: var(--transition);
  z-index: 100;
}

.nav-item-dropdown:hover .dropdown-menu,
.nav-item-dropdown:focus-within .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-menu li a {
  display: block;
  padding: 8px 18px;
  font-size: 0.88rem;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.dropdown-menu li a:hover {
  background-color: var(--color-subsurface);
  color: var(--color-text-main);
}

.dropdown-menu-divider {
  border-top: 1px solid var(--color-border);
  margin-top: 6px;
  padding-top: 6px;
}

/* Header Utilities (Theme & Language placed smartly on the far right) */
.header-utilities {
  display: flex;
  align-items: center;
  gap: 10px;
}

.theme-toggle-btn {
  background: var(--color-subsurface);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

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

.lang-dropdown-container {
  position: relative;
}

.lang-dropdown-btn {
  background: var(--color-subsurface);
  border: 1px solid var(--color-border);
  color: var(--color-text-main);
  height: 36px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 0 10px 0 9px;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1;
}

.lang-dropdown-btn:hover,
.lang-dropdown-container.open .lang-dropdown-btn {
  background-color: var(--color-surface);
  border-color: var(--color-border-hover);
  color: var(--color-text-main);
}

.lang-globe-icon {
  color: var(--color-text-muted);
  flex-shrink: 0;
}

.lang-caret-icon {
  color: var(--color-text-subtle);
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  margin-left: 2px;
}

.lang-dropdown-container.open .lang-caret-icon {
  transform: rotate(180deg);
}

.lang-dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  min-width: 140px;
  padding: 4px;
  z-index: 120;
}

.lang-dropdown-container.open .lang-dropdown-menu {
  display: block;
}

.lang-option-form {
  margin: 0;
  padding: 0;
}

.lang-dropdown-item {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background: none;
  border: none;
  border-radius: var(--radius-xs);
  color: var(--color-text-main);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  transition: var(--transition);
}

.lang-dropdown-item:hover {
  background-color: var(--color-subsurface);
  color: var(--color-primary-hover);
}

.lang-dropdown-item.active {
  font-weight: 700;
  color: var(--color-primary-hover);
  background-color: rgba(255, 193, 0, 0.08);
}

.lang-check {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--color-primary-hover);
}

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

/* ==========================================================================
   Buttons (Raspberry Pi Foundation Spec: 6px radius, sturdy, bold 700)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-sm); /* 6px radius - NOT pill! */
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
  min-height: 44px;
}

/* Gold Primary CTA */
.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  transform: translateY(-1px);
}

/* Deep Slate Action CTA (Matching RPi blue role) */
.btn-action {
  background-color: var(--color-action);
  color: #FFFFFF;
  border-color: var(--color-action);
}

.btn-action:hover {
  background-color: var(--color-action-hover);
  border-color: var(--color-action-hover);
  transform: translateY(-1px);
}

[data-theme="dark"] .btn-action {
  background-color: var(--color-surface-hover);
  color: var(--color-text-main);
  border-color: var(--color-border);
}

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

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

.btn-text {
  background: none;
  border: none;
  padding: 0;
  color: var(--color-text-main);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

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

/* Raspberry Pi Editorial Card Kicker (Pure typography, no bubbles/pills) */
.rpf-card-kicker {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-primary-hover);
  margin-bottom: 12px;
  line-height: 1.3;
}

[data-theme="dark"] .rpf-card-kicker {
  color: var(--color-primary);
}

.rpf-card-kicker-dot {
  opacity: 0.4;
  color: var(--color-text-subtle);
  font-weight: 900;
  font-size: 0.85rem;
}

.rpf-card-kicker-secondary {
  color: var(--color-text-muted);
  font-weight: 600;
}

/* Minimalist Rectangular Tag (Option 3: 4px corners, sentence-case, neutral flat) */
.rpf-rect-tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-text-muted);
  background-color: var(--color-subsurface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  line-height: 1.4;
  margin-bottom: 12px;
  width: fit-content;
  text-transform: none;
  letter-spacing: 0;
}

[data-theme="dark"] .rpf-rect-tag {
  background-color: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.1);
  color: var(--color-text-muted);
}

/* Badges & Chips */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-radius: var(--radius-full);
  background-color: var(--color-subsurface);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

.badge-gold {
  background-color: rgba(255, 193, 0, 0.15);
  color: #996F00;
  border-color: rgba(255, 193, 0, 0.35);
}

[data-theme="dark"] .badge-gold {
  color: var(--color-primary);
  border-color: rgba(255, 193, 0, 0.4);
}

/* Breadcrumbs */
.breadcrumbs,
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--color-text-subtle);
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.breadcrumbs a,
.breadcrumb a {
  color: var(--color-text-muted);
}

.breadcrumbs a:hover,
.breadcrumb a:hover {
  color: var(--color-text-main);
}

/* ==========================================================================
   Page Hero (.c-hero Style from RPi)
   ========================================================================== */
.page-hero,
.page-header {
  padding-top: 56px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-canvas);
}

.hero-title {
  font-size: clamp(2.15rem, 3.4vw, 3.15rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin-bottom: 18px;
  color: var(--color-text-main);
}

.section-title {
  font-size: clamp(1.6rem, 2.2vw, 2.15rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  color: var(--color-text-main);
}

.hero-subtitle,
.section-subtitle {
  font-size: clamp(1.05rem, 1.8vw, 1.22rem);
  color: var(--color-text-muted);
  max-width: 100%;
  line-height: 1.65;
  text-wrap: pretty;
}

/* ==========================================================================
   Editorial Vertical Stack & Focus Layout Utilities
   ========================================================================== */
.editorial-stack {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.focus-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.focus-card-icon {
  color: var(--color-primary-hover);
  margin-bottom: 16px;
}

.focus-grid .rpf-card-title {
  margin-bottom: 12px;
}

.focus-grid .rpf-card-body {
  margin-bottom: 0;
}

/* ==========================================================================
   Two-Column Editorial Stack (RPi Publications Standard)
   As verified in screenshots 4 & 5
   ========================================================================== */
.rpf-editorial-stack {
  display: flex;
  flex-direction: column;
  gap: 48px;
  margin-top: 36px;
}

.rpf-editorial-group {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 40px;
  padding: 40px;
  background-color: var(--color-subsurface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.rpf-editorial-label {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-text-main);
  letter-spacing: -0.02em;
}

.rpf-editorial-label-sub {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  margin-top: 6px;
  font-weight: 500;
}

.rpf-editorial-items {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Clean White Card (rounded: 8px, padding: 24px-28px) */
.rpf-card,
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md); /* 8px radius */
  padding: 26px 28px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.rpf-card:hover,
.card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.rpf-card-header,
.card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.rpf-card-title,
.card-title {
  font-size: 1.18rem;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.015em;
  margin-bottom: 10px;
  color: var(--color-text-main);
}

.rpf-card-title a:hover,
.card-title a:hover {
  color: var(--color-link);
}

.rpf-card-body,
.card-text {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  margin-bottom: 20px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
}

.rpf-card-footer,
.card-footer {
  padding-top: 14px;
  border-top: 1px solid var(--color-border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.rpf-card-category-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-text-subtle);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  line-height: 1.3;
}

[data-theme="dark"] .rpf-card-category-label {
  color: var(--color-text-muted);
}

/* Cards Grid (Clean 2-Column Layout) */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

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

/* ==========================================================================
   Filter Tabs (Quiet Single-Row)
   ========================================================================== */
.filter-tabs {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 36px;
  overflow-x: auto;
  padding-bottom: 6px;
}

.filter-tab {
  padding: 7px 16px;
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: var(--radius-sm); /* 6px radius */
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  color: var(--color-text-muted);
  white-space: nowrap;
  transition: var(--transition);
}

.filter-tab:hover {
  border-color: var(--color-text-subtle);
  color: var(--color-text-main);
}

.filter-tab.active {
  background-color: var(--color-action);
  border-color: var(--color-action);
  color: #FFFFFF;
}

[data-theme="dark"] .filter-tab.active {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-on-primary);
}

/* ==========================================================================
   Article & Publication Reading Layout (Academic Standard)
   ========================================================================== */
.article-meta-row {
  display: flex;
  gap: 14px;
  align-items: center;
  flex-wrap: wrap;
  font-size: 0.92rem;
  color: var(--color-text-muted);
}

.article-meta-row a {
  color: var(--color-primary-hover);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.meta-dot {
  color: var(--color-text-subtle);
  font-size: 0.8rem;
}

.meta-badge-open {
  color: var(--color-primary-hover);
  font-weight: 700;
}

.article-master-card {
  padding: 44px;
  margin-bottom: 48px;
  border-radius: var(--radius-lg);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
}

@media (max-width: 768px) {
  .article-master-card {
    padding: 24px;
  }
}

.article-master-title {
  font-size: clamp(1.35rem, 2.2vw, 1.75rem);
  font-weight: 800;
  line-height: 1.35;
  color: var(--color-text-main);
  margin-bottom: 22px;
  letter-spacing: -0.015em;
}

.article-reading-body {
  width: 100%;
}

.article-abstract-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-text-main);
  margin-bottom: 18px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-primary);
  display: inline-block;
}

.article-abstract-text {
  color: var(--color-text-main);
  line-height: 1.85;
  font-size: 1.05rem;
  opacity: 0.92;
}

/* ==========================================================================
   Footer (Raspberry Pi Foundation Architecture: .c-footer standard)
/* ==========================================================================
   Raspberry Pi Foundation Design Language Footer
   ========================================================================== */
.site-footer {
  background-color: var(--color-subsurface);
  border-top: 1px solid var(--color-border);
  padding-top: 56px;
  padding-bottom: 40px;
  margin-top: auto;
}

/* Tier 1: 3 Spacious Link Columns */
.footer-nav-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 60px;
  margin-bottom: 48px;
}

.footer-column-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 22px;
  display: inline-block;
  border-bottom: 2px solid var(--color-primary);
  padding-bottom: 5px;
  letter-spacing: normal;
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.footer-links-list a {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  transition: var(--transition);
}

.footer-links-list a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
  text-underline-offset: 3px;
}

[data-theme="dark"] .footer-links-list a:hover {
  color: var(--color-primary);
}

/* Tier 2: Raspberry Pi Sub-Footer Row (Logo, Mission & Copyright, Socials) */
.footer-subfooter {
  border-top: 1px solid var(--color-border);
  padding-top: 36px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: start;
  gap: 36px;
}

.footer-subfooter-brand .logo {
  margin-bottom: 0;
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-subfooter-mission {
  max-width: 680px;
}

.footer-mission-text {
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--color-text-muted);
  margin-bottom: 6px;
  margin-top: 2px;
}

.footer-copyright-text {
  font-size: 0.82rem;
  color: var(--color-text-subtle);
}

.footer-subfooter-social {
  display: flex;
  align-items: flex-start;
}

.footer-social-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.footer-social-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  transition: var(--transition);
}

.footer-social-btn:hover {
  background-color: var(--color-surface-hover);
  color: var(--color-primary-hover);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

[data-theme="dark"] .footer-social-btn:hover {
  color: var(--color-primary);
}

@media (max-width: 992px) {
  .footer-subfooter {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

@media (max-width: 768px) {
  .footer-nav-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

/* ==========================================================================
   Home & About Components
   ========================================================================== */
.hero {
  padding: 72px 0 54px;
  background-color: var(--color-canvas);
  border-bottom: 1px solid var(--color-border);
}

.hero-content {
  width: 100%;
}

.hero .hero-title {
  font-size: clamp(2.15rem, 3.4vw, 3.15rem);
  letter-spacing: -0.025em;
  margin-bottom: 18px;
  line-height: 1.15;
}

.hero-description {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  margin-bottom: 32px;
  max-width: 100%;
  text-wrap: pretty;
}

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

.mission-statement-section {
  padding: 44px 0;
  background-color: var(--color-subsurface);
  border-bottom: 1px solid var(--color-border);
}

.mission-statement-text {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-text-main);
  text-align: center;
  max-width: 860px;
  margin: 0 auto;
  line-height: 1.6;
}


.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 28px;
  flex-wrap: wrap;
  gap: 16px;
}

.action-section {
  padding: 48px 0;
}

.action-heading {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--color-text-main);
}

.action-subtitle {
  color: var(--color-text-muted);
  font-size: 1rem;
  margin-bottom: 32px;
}

.action-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.action-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.action-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.action-icon {
  color: var(--color-primary-hover);
}

.action-step-num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-text-subtle);
}

.action-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text-main);
}

.action-card-text {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 28px;
}

.team-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

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

.team-photo-wrap {
  aspect-ratio: 1 / 1;
  background-color: var(--color-subsurface);
  overflow: hidden;
}

.team-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.team-info {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.team-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 4px;
}

.team-role {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary-hover);
  margin-bottom: 12px;
}

.team-bio {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  flex: 1;
}

@media (max-width: 1100px) {
  .team-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
}

@media (max-width: 580px) {
  .team-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 960px) {
  .rpf-editorial-group {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 28px;
  }
}

@media (max-width: 640px) {
  .header-inner {
    height: 64px;
  }

  .nav-menu {
    gap: 16px;
  }
}

@media (max-width: 480px) {
  .site-header__main {
    gap: 14px;
  }

  .nav-menu {
    gap: 12px;
  }

  .nav-link {
    font-size: 0.88rem;
  }

  .logo {
    gap: 8px;
    font-size: 1.05rem;
  }

  .logo-img {
    height: 32px;
  }
}