/* -------------------------------------------------------------
   SDKA PRIME LLC — CORPORATE SITE STYLESHEET
   Follows design/DESIGN-SPEC.md · Zero external dependencies
   Native system fonts · WCAG 2.1 AA
   ------------------------------------------------------------- */
:root {
  /* Color Palette */
  --color-bg: #F8FAFC;
  --color-surface: #FFFFFF;
  --color-surface-subtle: #F1F5F9;
  --color-text-primary: #0F172A;
  --color-text-secondary: #475569;
  --color-text-muted: #64748B;
  --color-border: #E2E8F0;
  --color-border-hover: #CBD5E1;
  --color-accent: #1D4ED8;
  --color-accent-hover: #1E40AF;
  --color-accent-surface: #EFF6FF;
  --color-focus: #2563EB;

  /* Status Badges */
  --badge-ready-bg: #ECFDF5;
  --badge-ready-text: #065F46;
  --badge-ready-border: #A7F3D0;
  --badge-ready-dot: #059669;

  --badge-dev-bg: #F1F5F9;
  --badge-dev-text: #334155;
  --badge-dev-border: #CBD5E1;
  --badge-dev-dot: #64748B;

  --badge-beta-bg: #EFF6FF;
  --badge-beta-text: #1E40AF;
  --badge-beta-border: #BFDBFE;
  --badge-beta-dot: #2563EB;

  /* Typography */
  --font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  /* Spacing (8pt grid) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 9999px;

  /* Layout */
  --container-max-width: 1080px;
  --header-height: 70px;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + var(--space-4));
}

body {
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-system);
  font-size: 0.9375rem;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-wrap: break-word;
}

@media (min-width: 640px) {
  body {
    font-size: 1rem;
  }
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

/* Accessibility: Visible Focus Indicators */
:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
  z-index: 100;
  padding: var(--space-2) var(--space-4);
  background-color: var(--color-surface);
  color: var(--color-accent);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-weight: 600;
  transform: translateY(-200%);
}

.skip-link:focus {
  transform: translateY(0);
}

/* Layout Container */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

@media (min-width: 640px) {
  .container {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(248, 250, 252, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  height: var(--header-height);
}

/* Brand Wordmark */
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
  color: var(--color-text-primary);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
}

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

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 34px;
  height: 34px;
  background-color: var(--color-accent);
  color: var(--color-surface);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  border-radius: var(--radius-sm);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  white-space: nowrap;
}

.brand-title {
  font-weight: 700;
  color: var(--color-text-primary);
}

.brand-subtitle {
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
}

@media (max-width: 359px) {
  .brand-subtitle {
    display: none;
  }
}

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

@media (min-width: 768px) {
  .nav-group {
    gap: var(--space-6);
  }
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  list-style: none;
}

.nav-link {
  display: inline-block;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: var(--space-2) 0;
  position: relative;
}

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

.nav-link.active {
  color: var(--color-text-primary);
  font-weight: 600;
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-accent);
  border-radius: var(--radius-full);
}

/* Language Switcher */
.lang-switcher {
  display: inline-flex;
  align-items: center;
  list-style: none;
  background-color: var(--color-surface-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 2px;
  font-size: 0.8125rem;
  font-weight: 600;
}

.lang-btn {
  display: inline-block;
  padding: 6px 9px;
  border-radius: 4px;
  color: var(--color-text-secondary);
  line-height: 1;
  transition: color 0.15s ease, background-color 0.15s ease;
}

.lang-btn.active {
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  box-shadow: 0 0 0 1px var(--color-border), 0 1px 2px rgba(15, 23, 42, 0.06);
}

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

/* Mobile Menu Toggle Button */
.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  cursor: pointer;
}

.menu-toggle:hover {
  border-color: var(--color-border-hover);
}

.menu-toggle .icon-close {
  display: none;
}

.menu-toggle[aria-expanded="true"] .icon-open {
  display: none;
}

.menu-toggle[aria-expanded="true"] .icon-close {
  display: block;
}

/* Mobile Navigation Drawer */
.mobile-menu {
  display: none;
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.mobile-menu.open {
  display: block;
}

.mobile-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  padding-top: var(--space-2);
  padding-bottom: var(--space-3);
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: var(--space-2) 0;
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

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

.mobile-nav-link.active {
  color: var(--color-text-primary);
  font-weight: 600;
  box-shadow: inset 3px 0 0 var(--color-accent);
  padding-left: var(--space-3);
}

@media (min-width: 768px) {
  .site-nav {
    display: block;
  }

  .menu-toggle,
  .mobile-menu,
  .mobile-menu.open {
    display: none;
  }
}

/* Hero Section */
.hero-section {
  padding-top: var(--space-12);
  padding-bottom: var(--space-10);
}

@media (min-width: 768px) {
  .hero-section {
    padding-top: var(--space-16);
    padding-bottom: var(--space-12);
  }
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1.3;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
  background-color: var(--color-surface-subtle);
  border: 1px solid var(--color-border);
  padding: 4px 10px;
  border-radius: var(--radius-full);
}

@media (min-width: 768px) {
  .eyebrow {
    font-size: 0.8125rem;
  }
}

.eyebrow-dot {
  flex-shrink: 0;
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: var(--radius-full);
}

.hero-title,
.page-title {
  font-size: 1.875rem;
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.025em;
  color: var(--color-text-primary);
  max-width: 820px;
}

@media (min-width: 768px) {
  .hero-title,
  .page-title {
    font-size: 2.5rem;
  }
}

.hero-title {
  margin-bottom: var(--space-5);
}

.hero-subtitle,
.page-intro {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  max-width: 740px;
}

@media (min-width: 768px) {
  .hero-subtitle,
  .page-intro {
    font-size: 1.125rem;
  }
}

/* Inner Page Header */
.page-header {
  padding-top: var(--space-12);
  padding-bottom: var(--space-8);
}

@media (min-width: 768px) {
  .page-header {
    padding-top: var(--space-16);
  }
}

.page-intro {
  margin-top: var(--space-4);
}

.page-body {
  padding-bottom: var(--space-16);
}

/* Sections */
.section-apps {
  padding-top: var(--space-4);
  padding-bottom: var(--space-16);
}

.section-header {
  margin-bottom: var(--space-8);
}

.section-title {
  font-size: 1.375rem;
  font-weight: 650;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

@media (min-width: 768px) {
  .section-title {
    font-size: 1.625rem;
  }
}

.section-intro {
  color: var(--color-text-secondary);
  max-width: 680px;
}

/* App Cards Grid (1 column mobile, 2x2 desktop) */
.apps-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .apps-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-8);
  }
}

/* Apps page: stacked detailed cards */
.apps-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
  max-width: 860px;
}

/* App Card Component */
.app-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-width: 0;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

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

.app-card-top {
  min-width: 0;
}

.app-card-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.app-identity {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
}

.app-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-weight: 700;
  font-size: 0.9375rem;
  letter-spacing: 0.02em;
  border: 1px solid var(--color-border);
  background-color: var(--color-surface-subtle);
  color: var(--color-text-primary);
}

.app-title {
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
}

@media (min-width: 768px) {
  .app-title {
    font-size: 1.1875rem;
  }
}

.app-description {
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--color-text-secondary);
}

.app-tagline {
  font-size: 1rem;
  font-style: italic;
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
}

.app-features {
  list-style: none;
  display: grid;
  gap: var(--space-3);
  margin-top: var(--space-5);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-surface-subtle);
}

.app-features li {
  position: relative;
  padding-left: var(--space-5);
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

.app-features li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.62em;
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background-color: var(--color-accent);
}

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

/* Status Badges */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  max-width: 100%;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: 0.01em;
  border: 1px solid transparent;
}

@media (min-width: 768px) {
  .status-badge {
    font-size: 0.8125rem;
  }
}

.status-dot {
  flex-shrink: 0;
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
}

/* Badge Variant: Prepared / In preparation for publication (green) */
.badge-ready {
  background-color: var(--badge-ready-bg);
  color: var(--badge-ready-text);
  border-color: var(--badge-ready-border);
}

.badge-ready .status-dot {
  background-color: var(--badge-ready-dot);
}

/* Badge Variant: In development (gray) */
.badge-dev {
  background-color: var(--badge-dev-bg);
  color: var(--badge-dev-text);
  border-color: var(--badge-dev-border);
}

.badge-dev .status-dot {
  background-color: var(--badge-dev-dot);
}

/* Badge Variant: Closed beta (blue) */
.badge-beta {
  background-color: var(--badge-beta-bg);
  color: var(--badge-beta-text);
  border-color: var(--badge-beta-border);
}

.badge-beta .status-dot {
  background-color: var(--badge-beta-dot);
}

/* Card Footer / Action Link */
.app-card-footer {
  padding-top: var(--space-4);
  margin-top: var(--space-5);
  border-top: 1px solid var(--color-surface-subtle);
  display: flex;
  align-items: center;
  justify-content: flex-start;
}

.app-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  min-height: 24px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-accent);
}

.app-link:hover {
  text-decoration: underline;
}

.app-link-arrow {
  font-size: 0.8125rem;
  transition: transform 0.15s ease;
}

.app-link:hover .app-link-arrow {
  transform: translate(2px, -2px);
}

/* Fix vs. mockup: placeholder captions use secondary text (#475569, ≥ 7:1 on white) */
.app-link-placeholder {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

/* Info / Text Cards (About, Contact, Privacy) */
.info-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  max-width: 860px;
}

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

.info-block-text {
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.info-block-text + .info-block-text {
  margin-top: var(--space-4);
}

.contact-email-link {
  font-family: var(--font-mono);
  font-size: 0.9375em;
  font-weight: 500;
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.contact-email-link:hover {
  color: var(--color-accent-hover);
}

/* 404 */
.notfound-lang + .notfound-lang {
  margin-top: var(--space-6);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-surface-subtle);
}

.notfound-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
  list-style: none;
  margin-top: var(--space-3);
  font-weight: 500;
}

/* Footer */
.site-footer {
  margin-top: auto;
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-10);
  padding-bottom: var(--space-10);
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--color-text-muted);
}

.footer-top {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

@media (min-width: 768px) {
  .footer-top {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }
}

.footer-legal-name {
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-1);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
  list-style: none;
}

.footer-nav .footer-link {
  display: inline-block;
  padding: var(--space-1) 0;
}

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

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

.footer-link[aria-current="page"] {
  color: var(--color-text-primary);
  font-weight: 600;
}

.footer-bottom {
  border-top: 1px solid var(--color-surface-subtle);
  padding-top: var(--space-6);
}

/* Respect reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition: none !important;
  }

  .app-card:hover {
    transform: none;
  }
}