/* ==========================================================================
   Rhizent Technologies — Corporate Design System
   Minimalist, spacious, Signal-inspired.
   Zero external dependencies. Self-hosted font.
   ========================================================================== */

@font-face {
  font-family: 'Roboto Flex';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url('../fonts/roboto-flex.woff2') format('woff2');
}

:root {
  /* Core brand colors */
  --accent-green: #94F990;
  --accent-green-hover: #7ce878;
  --accent-text: #0E1012;

  /* Light Theme (Default) */
  --bg-primary: #FFFFFF;
  --bg-surface: #F8F9FA;
  --bg-surface-elevated: #FFFFFF;
  --bg-code: #F1F3F5;
  --text-primary: #111315;
  --text-secondary: #555D67;
  --text-muted: #76808D;
  --border-subtle: #E6E8EB;
  --border-strong: #D0D4DA;
  --focus-ring: #111315;
  --shadow-subtle: 0 1px 3px rgba(0, 0, 0, 0.04);
  --header-bg: rgba(255, 255, 255, 0.94);
  --badge-bg: #EEF0F2;
  --badge-text: #24292E;

  /* Spacing system */
  --space-xxs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4.5rem;
  --space-4xl: 6rem;

  /* Typography */
  --font-sans: 'Roboto Flex', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, 'SFMono-Regular', Menlo, Monaco, Consolas, monospace;
  --max-width: 1120px;
  --content-width: 760px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 9999px;
  --transition-fast: 0.15s ease;
}

[data-theme="dark"] {
  --bg-primary: #0E1012;
  --bg-surface: #16181B;
  --bg-surface-elevated: #1D2024;
  --bg-code: #1A1D21;
  --text-primary: #F4F5F7;
  --text-secondary: #9DA6B2;
  --text-muted: #6C7582;
  --border-subtle: #252930;
  --border-strong: #383E48;
  --focus-ring: #94F990;
  --shadow-subtle: 0 1px 3px rgba(0, 0, 0, 0.3);
  --header-bg: rgba(14, 16, 18, 0.94);
  --badge-bg: #1E2227;
  --badge-text: #DCE0E5;
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Accessibility: Skip to Content */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--accent-green);
  color: var(--accent-text);
  padding: 0.75rem 1.25rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-sm);
  z-index: 1000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 1rem;
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

/* Focus styles */
:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

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

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

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--header-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
}

.brand-logo-img {
  width: 32px;
  height: 32px;
  object-fit: contain;
  display: block;
}

/* In dark mode, show light logo variant */
[data-theme="dark"] .brand-logo-img.logo-light-mode {
  display: none;
}
[data-theme="dark"] .brand-logo-img.logo-dark-mode {
  display: block;
}
:root:not([data-theme="dark"]) .brand-logo-img.logo-dark-mode {
  display: none;
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 1.5rem;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  padding: 0.25rem 0;
  position: relative;
}

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

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

.nav-link[aria-current="page"]::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--accent-green);
  border-radius: 2px;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.theme-icon-sun,
.theme-icon-moon {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

[data-theme="dark"] .theme-icon-moon {
  display: none;
}
[data-theme="dark"] .theme-icon-sun {
  display: block;
}
:root:not([data-theme="dark"]) .theme-icon-sun {
  display: none;
}
:root:not([data-theme="dark"]) .theme-icon-moon {
  display: block;
}

/* Mobile Menu Button */
.menu-toggle-btn {
  display: none;
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.menu-toggle-btn svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

/* Mobile Drawer */
.mobile-drawer {
  display: none;
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--bg-surface-elevated);
  padding: var(--space-lg);
}

.mobile-drawer.is-open {
  display: block;
}

.mobile-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.mobile-nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 1.1rem;
  font-weight: 500;
  display: block;
  padding: var(--space-xs) 0;
}

.mobile-nav-link[aria-current="page"] {
  color: var(--text-primary);
  font-weight: 700;
}

.mobile-drawer-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-md);
  border-top: 1px solid var(--border-subtle);
}

/* Main content wrapper */
main {
  flex: 1;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.75rem 1.35rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--accent-green);
  color: var(--accent-text);
  border-color: var(--accent-green);
}

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

.btn-secondary {
  background-color: transparent;
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.btn-secondary:hover {
  background-color: var(--bg-surface);
  border-color: var(--text-primary);
}

/* Badge */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  border-radius: var(--radius-full);
  background-color: var(--badge-bg);
  color: var(--badge-text);
  border: 1px solid var(--border-subtle);
}

.badge-accent {
  background-color: var(--accent-green);
  color: var(--accent-text);
  border-color: var(--accent-green);
}

/* Section styling */
.section {
  padding-top: var(--space-3xl);
  padding-bottom: var(--space-3xl);
}

.section-hero {
  padding-top: var(--space-4xl);
  padding-bottom: var(--space-3xl);
}

.section-header {
  margin-bottom: var(--space-2xl);
}

.section-label {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: var(--space-xs);
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  line-height: 1.25;
}

.section-description {
  margin-top: var(--space-xs);
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 640px;
}

/* Typography styles */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 700;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  line-height: 1.15;
}

h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.25rem);
  line-height: 1.25;
}

h3 {
  font-size: 1.35rem;
  line-height: 1.35;
}

p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.7;
}

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

a {
  color: var(--text-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

/* Hero Component */
.hero-content {
  max-width: 780px;
}

.hero-tagline {
  display: inline-block;
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

.hero-headline {
  margin-bottom: var(--space-lg);
  font-size: clamp(2.5rem, 5.5vw, 3.75rem);
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.hero-subhead {
  font-size: clamp(1.15rem, 2vw, 1.35rem);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-2xl);
  max-width: 660px;
}

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

/* Cards & Grid */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

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

.card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.card:hover {
  border-color: var(--border-strong);
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: var(--space-xs);
}

.card-text {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* Product Spotlight Card */
.product-card {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  position: relative;
}

.product-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.product-card-title {
  font-size: 1.75rem;
}

.product-card-tagline {
  font-size: 1.05rem;
  color: var(--text-secondary);
}

.product-feature-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  margin-top: var(--space-sm);
  margin-bottom: var(--space-md);
}

.product-feature-item {
  font-size: 0.95rem;
  color: var(--text-secondary);
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.product-feature-item strong {
  color: var(--text-primary);
}

.product-feature-bullet {
  color: var(--accent-text);
  background-color: var(--accent-green);
  width: 18px;
  height: 18px;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  flex-shrink: 0;
  margin-top: 2px;
}

/* Callout Box */
.callout {
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.callout-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
  color: var(--text-primary);
}

.callout p {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* Legal Banner Notice */
.legal-notice-banner {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-left: 4px solid var(--accent-green);
  border-radius: var(--radius-sm);
  padding: var(--space-md) var(--space-lg);
  margin-bottom: var(--space-2xl);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.legal-notice-banner strong {
  color: var(--text-primary);
}

/* Legal Documents Layout */
.legal-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.legal-toc {
  position: sticky;
  top: 6rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  max-height: calc(100vh - 8rem);
  overflow-y: auto;
}

.legal-toc-title {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}

.legal-toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.legal-toc-link {
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-decoration: none;
  display: block;
  padding: 0.2rem 0;
  transition: color var(--transition-fast);
}

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

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

.legal-content h2 {
  font-size: 1.5rem;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-sm);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border-subtle);
}

.legal-content h3 {
  font-size: 1.15rem;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-xs);
}

.legal-content ul,
.legal-content ol {
  margin-left: 1.5rem;
  margin-top: var(--space-sm);
  margin-bottom: var(--space-md);
  color: var(--text-secondary);
}

.legal-content li {
  margin-bottom: 0.4rem;
  font-size: 1rem;
  line-height: 1.65;
}

/* Accordion Component */
.accordion {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.accordion-item {
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background-color: var(--bg-surface);
  overflow: hidden;
}

.accordion-summary {
  padding: var(--space-lg);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  user-select: none;
}

.accordion-summary::-webkit-details-marker {
  display: none;
}

.accordion-icon {
  width: 18px;
  height: 18px;
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

details[open] .accordion-icon {
  transform: rotate(180deg);
}

.accordion-body {
  padding: 0 var(--space-lg) var(--space-lg) var(--space-lg);
  color: var(--text-secondary);
  border-top: 1px solid var(--border-subtle);
  padding-top: var(--space-md);
}

/* Forms */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.form-input,
.form-textarea {
  width: 100%;
  font-family: inherit;
  font-size: 1rem;
  padding: 0.75rem 1rem;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--text-primary);
}

.form-textarea {
  min-height: 140px;
  resize: vertical;
}

/* Footer */
.site-footer {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  padding-top: var(--space-3xl);
  padding-bottom: var(--space-2xl);
  margin-top: auto;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer-brand-blurb {
  max-width: 320px;
}

.footer-brand-blurb p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-top: var(--space-sm);
}

.footer-col-title {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

.footer-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-nav-link {
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Responsive Breakpoints */
@media (max-width: 900px) {
  .grid-3 {
    grid-template-columns: 1fr;
  }
  .grid-2 {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
  .legal-layout {
    grid-template-columns: 1fr;
  }
  .legal-toc {
    position: static;
  }
  .product-feature-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .nav-desktop {
    display: none;
  }
  .menu-toggle-btn {
    display: inline-flex;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Print Styles */
@media print {
  .site-header,
  .site-footer,
  .theme-toggle-btn,
  .menu-toggle-btn,
  .legal-toc,
  .btn,
  .skip-link {
    display: none !important;
  }
  body {
    background: #FFF !important;
    color: #000 !important;
    font-size: 11pt !important;
  }
  .container {
    max-width: 100% !important;
    padding: 0 !important;
  }
  .legal-layout {
    display: block !important;
  }
  a {
    text-decoration: underline !important;
    color: #000 !important;
  }
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}