/* ===========================
   Design System: CSS Custom Properties
   =========================== */

:root {
  color-scheme: light;

  /* Colors — Open Innova brand palette (light theme) */
  --color-primary: #1a2647;          /* navy — logo background */
  --color-primary-dark: #0f1830;
  --color-primary-light: #e8ecf5;
  --color-secondary: #2d7a5f;        /* teal/emerald — logo accent */
  --color-secondary-dark: #1f5641;
  --color-secondary-light: #4ca37f;
  --color-accent: #4ca37f;           /* lighter green for highlights */
  --color-heading: #1a2647;          /* titles, strong UI text */
  --color-text: #1a2647;             /* body text */
  --color-text-light: #5a6580;
  --color-text-lighter: #9099ad;
  --color-surface: #ffffff;          /* page background */
  --color-surface-light: #f4f6fa;    /* alt rows, form bg, TOC bg */
  --color-surface-elevated: #ffffff; /* cards, modals */
  --color-border: #d9deea;
  --color-link: #2d7a5f;             /* in-content links */
  --color-link-hover: #1f5641;
  --color-overlay: rgba(26, 38, 71, 0.55);
  --color-input-bg: #ffffff;
  --color-error: #d32f2f;
  --color-success: #2d7a5f;
  --color-warning: #f57c00;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "Courier New", monospace;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Spacing (8px base unit) */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);

  /* Animations */
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 500ms;
  --timing-function: cubic-bezier(0.4, 0, 0.2, 1);

  /* Z-index layers */
  --z-dropdown: 100;
  --z-modal: 1000;
  --z-tooltip: 1100;
}

/* ===========================
   Dark theme (follows OS preference — no toggle, no storage)
   =========================== */

@media (prefers-color-scheme: dark) {
  /* Buttons: navy fill on dark bg has weak contrast — promote secondary green */
  .btn-primary {
    background-color: var(--color-secondary);
    border-color: var(--color-secondary);
  }
  .btn-primary:hover,
  .btn-primary:focus-visible {
    background-color: var(--color-secondary-light);
    border-color: var(--color-secondary-light);
  }
  .btn-primary:active {
    background-color: var(--color-secondary-dark);
    border-color: var(--color-secondary-dark);
  }

  /* Outline button hover/active: navy on dark is invisible — use green instead */
  .btn-outline:hover,
  .btn-outline:focus-visible {
    background-color: var(--color-secondary);
    border-color: var(--color-secondary);
  }
  .btn-outline:active {
    background-color: var(--color-secondary-dark);
    border-color: var(--color-secondary-dark);
  }

  /* Table header looks better with the same brand-green treatment in dark */
  .page-body thead {
    background-color: var(--color-secondary-dark);
  }

  :root {
    color-scheme: dark;

    /* Brand stays — we shift surrounding surfaces and text instead */
    --color-primary: #1a2647;
    --color-primary-dark: #0f1830;
    --color-primary-light: #232f50;
    --color-secondary: #4ca37f;
    --color-secondary-dark: #2d7a5f;
    --color-secondary-light: #6dc4a0;
    --color-accent: #6dc4a0;
    --color-heading: #f0f3fa;
    --color-text: #e1e6f1;
    --color-text-light: #a8b0c4;
    --color-text-lighter: #6b7796;
    --color-surface: #0e1530;
    --color-surface-light: #161e3d;
    --color-surface-elevated: #1c2547;
    --color-border: #2a3458;
    --color-link: #6dc4a0;
    --color-link-hover: #8fdab8;
    --color-overlay: rgba(2, 6, 18, 0.7);
    --color-input-bg: #0e1530;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.45);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.55);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.6);
  }
}

/* ===========================
   CSS Reset & Base Styles
   =========================== */

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

html {
  scroll-behavior: smooth;
  /* Leave room for the sticky header (70px) + a little breathing space */
  scroll-padding-top: calc(70px + var(--space-md));
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-surface);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===========================
   Typography
   =========================== */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

h1 {
  font-size: var(--font-size-4xl);
}

h2 {
  font-size: var(--font-size-3xl);
}

h3 {
  font-size: var(--font-size-2xl);
}

h4 {
  font-size: var(--font-size-xl);
}

h5 {
  font-size: var(--font-size-lg);
}

h6 {
  font-size: var(--font-size-base);
}

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

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color var(--duration-fast) var(--timing-function);
}

a:hover,
a:focus {
  color: var(--color-link-hover);
  text-decoration: underline;
}

a:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: var(--space-xs) var(--space-sm);
  background-color: var(--color-surface-light);
  border-radius: var(--radius-md);
}

pre {
  background-color: var(--color-primary);
  color: #fff;
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  margin-bottom: var(--space-lg);
}

pre code {
  background: none;
  color: inherit;
  padding: 0;
}

/* ===========================
   Layout
   =========================== */

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

main {
  min-height: 60vh;
}

/* ===========================
   Header & Navigation
   =========================== */

header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: var(--z-dropdown);
  box-shadow: var(--shadow-sm);
}

.navbar {
  display: flex;
  align-items: center;
  height: 70px;
}

.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.navbar-logo {
  display: flex;
  align-items: center;
  color: var(--color-heading);
  text-decoration: none;
  transition: opacity var(--duration-fast) var(--timing-function);
}

.navbar-logo:hover,
.navbar-logo:focus {
  opacity: 0.85;
}

.navbar-logo svg {
  height: 38px;
  width: auto;
  display: block;
}

.navbar-menu {
  display: flex;
  list-style: none;
  gap: var(--space-lg);
}

.navbar-link {
  color: var(--color-text);
  font-weight: var(--font-weight-normal);
  text-decoration: none;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--timing-function);
}

.navbar-link:hover {
  color: var(--color-heading);
  background-color: var(--color-primary-light);
}

.navbar-link.active {
  color: var(--color-secondary);
  font-weight: var(--font-weight-semibold);
  background-color: var(--color-primary-light);
  box-shadow: inset 0 -2px 0 var(--color-secondary);
}

.navbar-link.active:hover,
.navbar-link.active:focus {
  color: var(--color-link-hover);
  background-color: var(--color-primary-light);
}

.navbar-languages {
  display: flex;
  gap: var(--space-sm);
}

.lang-switcher {
  display: flex;
  gap: var(--space-sm);
}

.lang-link {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--timing-function);
}

.lang-link:hover {
  color: var(--color-heading);
  background-color: var(--color-primary-light);
}

.lang-link.active {
  color: var(--color-heading);
  font-weight: var(--font-weight-semibold);
}

/* ===========================
   Mobile navigation (hamburger + full-screen dialog)
   =========================== */

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--color-heading);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--timing-function),
              color var(--duration-fast) var(--timing-function);
}

.nav-toggle:hover {
  background-color: var(--color-primary-light);
  color: var(--color-secondary);
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
}

.nav-menu {
  width: 100vw;
  max-width: 100vw;
  height: 100vh;
  max-height: 100vh;
  padding: 0;
  margin: 0;
  border: none;
  background-color: var(--color-surface-elevated);
  color: var(--color-text);
}

.nav-menu::backdrop {
  background-color: var(--color-overlay);
}

.nav-menu[open] {
  display: flex;
  flex-direction: column;
}

.nav-menu__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}

.nav-menu__logo {
  display: flex;
  align-items: center;
  color: var(--color-heading);
  text-decoration: none;
}

.nav-menu__logo svg {
  height: 36px;
  width: auto;
  display: block;
}

.nav-menu__close {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--color-heading);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--timing-function),
              color var(--duration-fast) var(--timing-function);
}

.nav-menu__close:hover {
  background-color: var(--color-primary-light);
  color: var(--color-secondary);
}

.nav-menu__close:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
}

.nav-menu__list {
  flex: 1 1 auto;
  list-style: none;
  margin: 0;
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  overflow-y: auto;
}

.nav-menu__link {
  display: block;
  padding: var(--space-md) var(--space-lg);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-heading);
  text-decoration: none;
  border-radius: var(--radius-md);
  min-height: 48px;
  transition: background-color var(--duration-fast) var(--timing-function),
              color var(--duration-fast) var(--timing-function);
}

.nav-menu__link:hover,
.nav-menu__link:focus {
  background-color: var(--color-primary-light);
  color: var(--color-secondary);
  text-decoration: none;
}

.nav-menu__link:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
}

.nav-menu__link.active {
  color: var(--color-secondary);
  background-color: var(--color-primary-light);
  box-shadow: inset 4px 0 0 var(--color-secondary);
}

.nav-menu__lang {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-xl);
  border-top: 1px solid var(--color-border);
}

.nav-menu__lang-link {
  flex: 1;
  text-align: center;
  padding: var(--space-md);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-light);
  text-decoration: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  min-height: 48px;
  transition: all var(--duration-fast) var(--timing-function);
}

.nav-menu__lang-link:hover {
  color: var(--color-heading);
  border-color: var(--color-heading);
  text-decoration: none;
}

.nav-menu__lang-link.active {
  color: var(--color-secondary);
  border-color: var(--color-secondary);
  background-color: var(--color-primary-light);
}

@media (max-width: 900px) {
  .navbar-menu,
  .navbar-languages {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }
}

/* ===========================
   Hero Section
   =========================== */

.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary-dark) 100%);
  color: white;
  padding: var(--space-4xl) var(--space-lg);
  text-align: center;
}

.hero-container {
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  color: white;
  font-size: var(--font-size-5xl);
  margin-bottom: var(--space-lg);
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--space-2xl);
}

.hero-cta {
  display: flex;
  gap: var(--space-lg);
  justify-content: center;
  flex-wrap: wrap;
}

/* ===========================
   Buttons
   =========================== */

.btn {
  display: inline-block;
  padding: var(--space-md) var(--space-xl);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--duration-normal) var(--timing-function);
  text-align: center;
  white-space: nowrap;
}

.btn:focus {
  outline: none;
}

.btn:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 3px;
}

/* Primary: navy fill on light backgrounds */
.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
  border: 2px solid var(--color-primary);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background-color: var(--color-secondary);
  border-color: var(--color-secondary);
  color: #ffffff;
}

.btn-primary:active {
  background-color: var(--color-secondary-dark);
  border-color: var(--color-secondary-dark);
  color: #ffffff;
}

/* Secondary: green fill */
.btn-secondary {
  background-color: var(--color-secondary);
  color: #ffffff;
  border: 2px solid var(--color-secondary);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  background-color: var(--color-secondary-dark);
  border-color: var(--color-secondary-dark);
  color: #ffffff;
}

.btn-secondary:active {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff;
}

/* Outline: navy on light backgrounds (text/border share --color-heading so they stay consistent in dark mode) */
.btn-outline {
  background-color: transparent;
  color: var(--color-heading);
  border: 2px solid var(--color-heading);
}

.btn-outline:hover,
.btn-outline:focus-visible {
  background-color: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
}

.btn-outline:active {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: #ffffff;
}

/* Hero buttons: light text on dark gradient background */
.hero .btn-primary {
  background-color: var(--color-secondary);
  color: #ffffff;
  border-color: var(--color-secondary);
}

.hero .btn-primary:hover,
.hero .btn-primary:focus-visible {
  background-color: var(--color-secondary-light);
  border-color: var(--color-secondary-light);
  color: #ffffff;
}

.hero .btn-primary:active {
  background-color: var(--color-secondary-dark);
  border-color: var(--color-secondary-dark);
}

.hero .btn-outline {
  background-color: transparent;
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.75);
}

.hero .btn-outline:hover,
.hero .btn-outline:focus-visible {
  background-color: rgba(255, 255, 255, 0.12);
  color: #ffffff;
  border-color: #ffffff;
}

.hero .btn-outline:active {
  background-color: rgba(255, 255, 255, 0.22);
  color: #ffffff;
  border-color: #ffffff;
}

/* Disabled CTA (page is draft / work in progress) */
.btn-disabled,
.btn.is-disabled {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: auto;
  position: relative;
}

.btn-disabled::after,
.btn.is-disabled::after {
  content: "WIP";
  display: inline-block;
  margin-left: var(--space-sm);
  padding: 0 0.4em;
  font-size: 0.7em;
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.06em;
  border-radius: var(--radius-sm);
  background-color: rgba(0, 0, 0, 0.15);
  vertical-align: middle;
}

/* Disabled nav link (page is draft) */
.navbar-link.is-disabled,
.nav-menu__link.is-disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: auto;
}

.navbar-link.is-disabled::after,
.nav-menu__link.is-disabled::after {
  content: "WIP";
  display: inline-block;
  margin-left: var(--space-xs);
  padding: 0 0.4em;
  font-size: 0.65em;
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.06em;
  vertical-align: middle;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary-light);
  color: var(--color-text);
}

/* ===========================
   Cards
   =========================== */

.card {
  background-color: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--duration-normal) var(--timing-function);
}

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

.card-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-md);
}

.card-text {
  color: var(--color-text-light);
  margin-bottom: var(--space-md);
}

/* ===========================
   Content Sections
   =========================== */

.content-section {
  padding: var(--space-4xl) var(--space-lg);
  background-color: var(--color-surface);
}

.content-section:nth-child(even) {
  background-color: var(--color-surface-light);
}

.page-content {
  padding: var(--space-2xl) var(--space-lg);
}

.page-title {
  text-align: center;
  margin-bottom: var(--space-xl);
  color: var(--color-heading);
}

.page-subtitle {
  text-align: center;
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  margin-bottom: var(--space-2xl);
}

.page-body {
  max-width: 800px;
  margin: 0 auto var(--space-2xl);
}

.page-body h2 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.015em;
  line-height: 1.15;
  color: var(--color-heading);
  margin-top: var(--space-4xl);
  margin-bottom: var(--space-lg);
  margin-left: calc(-1 * var(--space-xl));
  padding-left: var(--space-md);
  border-left: 4px solid var(--color-secondary);
}

.page-body h2:first-child {
  margin-top: 0;
}

@media (max-width: 900px) {
  .page-body h2 {
    margin-left: 0;
    font-size: var(--font-size-3xl);
  }
}

.page-body h3 {
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
}

.page-body h4 {
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}

.page-body ul,
.page-body ol {
  margin-left: var(--space-lg);
  margin-bottom: var(--space-md);
}

.page-body li {
  margin-bottom: var(--space-sm);
}

.page-body hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-4xl) auto;
  max-width: 200px;
}

/* ===========================
   Tables inside page body
   =========================== */

.page-body .table-wrapper {
  overflow-x: auto;
  margin: var(--space-xl) 0;
}

.page-body table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: var(--font-size-base);
  background-color: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin: var(--space-xl) 0;
}

.page-body thead {
  background-color: var(--color-primary);
  color: #ffffff;
}

.page-body thead th {
  padding: var(--space-md) var(--space-lg);
  text-align: left;
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: #ffffff;
  border-bottom: none;
}

.page-body thead th + th {
  text-align: right;
}

.page-body tbody td {
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--color-border);
  vertical-align: middle;
  color: var(--color-text);
}

.page-body tbody td + td {
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-weight: var(--font-weight-semibold);
  color: var(--color-heading);
}

.page-body tbody tr:nth-child(even) td {
  background-color: var(--color-surface-light);
}

.page-body tbody tr:hover td {
  background-color: rgba(76, 163, 127, 0.08);
}

/* Highlight a row when both cells are wrapped in <strong> (markdown **bold**) */
.page-body tbody tr:has(td:first-child strong):has(td:last-child strong) td {
  background-color: rgba(45, 122, 95, 0.12);
  color: var(--color-heading);
  font-weight: var(--font-weight-semibold);
  border-top-color: var(--color-secondary);
  border-bottom-color: var(--color-secondary);
}

.page-body tbody tr:has(td:first-child strong):has(td:last-child strong) td:first-child {
  border-left: 4px solid var(--color-secondary);
  padding-left: calc(var(--space-lg) - 4px);
}

@media (max-width: 600px) {
  .page-body thead th,
  .page-body tbody td {
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-sm);
  }
}

/* ===========================
   Contact form
   =========================== */

.contact-form {
  display: grid;
  gap: var(--space-lg);
  width: 100%;
  margin: var(--space-xl) 0;
  padding: var(--space-2xl);
  background-color: var(--color-surface-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.contact-form .form-row {
  display: grid;
  gap: var(--space-sm);
}

.contact-form label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-heading);
  letter-spacing: 0.01em;
}

.contact-form .form-required {
  color: var(--color-secondary);
  margin-left: 2px;
}

.contact-form .form-optional {
  color: var(--color-text-lighter);
  font-weight: var(--font-weight-normal);
  font-size: var(--font-size-xs);
  margin-left: var(--space-xs);
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-input-bg);
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--duration-fast) var(--timing-function),
              box-shadow var(--duration-fast) var(--timing-function);
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: var(--color-text-lighter);
}

.contact-form input:hover,
.contact-form textarea:hover {
  border-color: var(--color-text-lighter);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(45, 122, 95, 0.18);
}

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

.contact-form .form-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-top: var(--space-sm);
}

.contact-form button[type="submit"] {
  align-self: flex-start;
}

.form-note {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  line-height: var(--line-height-normal);
  margin: 0;
}

@media (max-width: 600px) {
  .contact-form {
    padding: var(--space-lg);
  }
}

/* ===========================
   Back-to-top button
   =========================== */

.back-to-top {
  position: fixed;
  right: var(--space-xl);
  bottom: var(--space-xl);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-primary);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  transition: opacity var(--duration-normal) var(--timing-function),
              transform var(--duration-normal) var(--timing-function),
              background-color var(--duration-fast) var(--timing-function);
  z-index: var(--z-dropdown);
}

.back-to-top--visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover,
.back-to-top:focus {
  background-color: var(--color-secondary);
  outline: none;
}

.back-to-top:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  .back-to-top {
    transition: opacity var(--duration-fast) linear;
    transform: none;
  }
}

/* ===========================
   Cookie-free badge & modal
   =========================== */

.cookie-badge {
  position: fixed;
  left: var(--space-xl);
  bottom: var(--space-xl);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-secondary);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--timing-function),
              transform var(--duration-fast) var(--timing-function);
  z-index: var(--z-dropdown);
}

.cookie-badge:hover,
.cookie-badge:focus {
  background-color: var(--color-secondary-dark);
  transform: translateY(-2px);
  outline: none;
}

.cookie-badge:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

.cookie-modal {
  max-width: 480px;
  width: calc(100% - 2 * var(--space-lg));
  padding: var(--space-2xl);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface-elevated);
  color: var(--color-text);
  box-shadow: var(--shadow-xl);
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.cookie-modal::backdrop {
  background-color: var(--color-overlay);
}

.cookie-modal__close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--color-text-light);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--timing-function),
              color var(--duration-fast) var(--timing-function);
}

.cookie-modal__close:hover,
.cookie-modal__close:focus {
  background-color: var(--color-surface-light);
  color: var(--color-heading);
  outline: none;
}

.cookie-modal__title {
  font-size: var(--font-size-2xl);
  line-height: var(--line-height-tight);
  color: var(--color-heading);
  margin: 0 var(--space-2xl) var(--space-md) 0;
}

.cookie-modal__body {
  font-size: var(--font-size-base);
  color: var(--color-text);
  margin-bottom: var(--space-md);
  line-height: var(--line-height-normal);
}

.cookie-modal__body:last-child {
  margin-bottom: 0;
}

.cookie-modal__body a {
  color: var(--color-link);
  text-decoration: underline;
}

.cookie-modal__body a:hover {
  color: var(--color-link-hover);
}

@media (max-width: 768px) {
  .cookie-badge {
    left: var(--space-lg);
    bottom: var(--space-lg);
  }
  .back-to-top {
    right: var(--space-lg);
    bottom: var(--space-lg);
  }
}

@media (prefers-reduced-motion: reduce) {
  .cookie-badge {
    transition: background-color var(--duration-fast) linear;
  }
  .cookie-badge:hover,
  .cookie-badge:focus {
    transform: none;
  }
}

/* ===========================
   Table of Contents
   =========================== */

.toc {
  background-color: var(--color-surface-light);
  border-left: 3px solid var(--color-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-lg) var(--space-xl);
  margin-bottom: var(--space-3xl);
}

.toc-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
}

.toc nav#TableOfContents > ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.toc nav#TableOfContents ul ul {
  list-style: none;
  margin: var(--space-xs) 0 var(--space-xs) var(--space-lg);
  padding: 0;
  border-left: 1px solid var(--color-border);
  padding-left: var(--space-md);
}

.toc nav#TableOfContents li {
  margin-bottom: var(--space-xs);
  line-height: var(--line-height-normal);
}

.toc nav#TableOfContents a {
  color: var(--color-text);
  font-size: var(--font-size-sm);
  text-decoration: none;
  display: inline-block;
  padding: var(--space-xs) 0;
  border-bottom: 1px solid transparent;
  transition: color var(--duration-fast) var(--timing-function),
              border-color var(--duration-fast) var(--timing-function);
}

.toc nav#TableOfContents a:hover,
.toc nav#TableOfContents a:focus {
  color: var(--color-secondary);
  border-bottom-color: var(--color-secondary);
  text-decoration: none;
}

.page-cta {
  text-align: center;
  padding-top: var(--space-2xl);
}

/* ===========================
   Footer
   =========================== */

footer {
  background-color: var(--color-primary);
  color: white;
  padding: var(--space-3xl) var(--space-lg) var(--space-lg);
  margin-top: var(--space-4xl);
}

.footer-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer-section h3,
.footer-section h4 {
  color: white;
  margin-bottom: var(--space-md);
}

.footer-section a {
  color: rgba(255, 255, 255, 0.7);
}

.footer-section a:hover {
  color: white;
  text-decoration: underline;
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: var(--space-sm);
}

.footer-contact {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.7);
}

.footer-contact p {
  margin-bottom: var(--space-sm);
}

.social-links {
  display: flex;
  gap: var(--space-md);
  list-style: none;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--space-lg);
  text-align: center;
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.6);
}

.footer-copyright {
  margin-bottom: var(--space-sm);
}

.footer-legal-info code {
  background-color: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.9);
}

/* ===========================
   Responsive Design
   =========================== */

@media (max-width: 768px) {
  .hero-title {
    font-size: var(--font-size-3xl);
  }

  .hero-subtitle {
    font-size: var(--font-size-base);
  }

  .hero-cta {
    flex-direction: column;
    gap: var(--space-md);
  }

  .btn {
    width: 100%;
  }

  .footer-container {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-md);
  }

  h1 {
    font-size: var(--font-size-2xl);
  }

  h2 {
    font-size: var(--font-size-xl);
  }

  .hero {
    padding: var(--space-2xl) var(--space-md);
  }

  .hero-title {
    font-size: var(--font-size-2xl);
  }

  .navbar-logo {
    font-size: var(--font-size-sm);
  }
}

/* ===========================
   Utility Classes
   =========================== */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.text-center {
  text-align: center;
}

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

.mt-lg {
  margin-top: var(--space-lg);
}

.mb-lg {
  margin-bottom: var(--space-lg);
}

.py-lg {
  padding-top: var(--space-lg);
  padding-bottom: var(--space-lg);
}

.print {
  display: none;
}

@media print {
  .print {
    display: block;
  }

  header,
  footer {
    display: none;
  }
}