/* ============================================
   CrossData — Design System & Styles
   Version: 0.1.0
   ============================================ */

/* --- Custom Properties --- */
:root {
  /* Colors */
  --color-primary: #0F2B5B;
  --color-primary-dark: #091D3E;
  --color-primary-light: #1A3F7A;
  --color-accent: #2E7CF6;
  --color-accent-hover: #1B6AE0;
  --color-accent-light: #E8F1FE;
  --color-surface: #F7F9FC;
  --color-surface-alt: #EEF2F7;
  --color-text: #1A2332;
  --color-text-secondary: #4A5568;
  --color-text-muted: #718096;
  --color-border: #E2E8F0;
  --color-white: #FFFFFF;
  --color-success: #059669;
  --color-error: #DC2626;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    'Helvetica Neue', Arial, sans-serif;
  --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;
  --line-height-tight: 1.2;
  --line-height-base: 1.6;
  --line-height-relaxed: 1.75;

  /* Spacing */
  --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;

  /* Layout */
  --container-max: 1200px;
  --container-narrow: 800px;
  --header-height: 72px;

  /* Borders & Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07),
    0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08),
    0 4px 6px -2px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08),
    0 10px 10px -5px rgba(0, 0, 0, 0.03);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
}

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

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

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

img,
svg {
  display: block;
  max-width: 100%;
}

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

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

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
}

/* --- Skip Link (Accessibility) --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  background: var(--color-accent);
  color: var(--color-white);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  z-index: 1000;
  font-weight: 600;
  font-size: var(--font-size-sm);
}

.skip-link:focus {
  top: var(--space-md);
  color: var(--color-white);
  outline: 3px solid var(--color-accent-hover);
  outline-offset: 2px;
}

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

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

main {
  flex: 1;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  line-height: var(--line-height-tight);
  color: var(--color-primary);
  font-weight: 700;
}

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); }

@media (min-width: 1024px) {
  h1 { font-size: var(--font-size-5xl); }
  h2 { font-size: var(--font-size-4xl); }
}

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

p:last-child {
  margin-bottom: 0;
}

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

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

.section--lg {
  padding-block: var(--space-4xl);
}

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

.section-header {
  text-align: center;
  max-width: 700px;
  margin-inline: auto;
  margin-bottom: var(--space-2xl);
}

.section-header h2 {
  margin-bottom: var(--space-md);
}

.section-header p {
  font-size: var(--font-size-lg);
}

@media (min-width: 1024px) {
  .section {
    padding-block: var(--space-4xl);
  }
  .section--lg {
    padding-block: 5rem;
  }
  .section-header {
    margin-bottom: var(--space-3xl);
  }
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.75rem;
  font-size: var(--font-size-base);
  font-weight: 600;
  line-height: 1;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
  border: 2px solid transparent;
}

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

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

.btn--primary:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn--outline:hover {
  background-color: var(--color-accent);
  color: var(--color-white);
  transform: translateY(-1px);
}

.btn--white {
  background-color: var(--color-white);
  color: var(--color-primary);
  border-color: var(--color-white);
}

.btn--white:hover {
  background-color: var(--color-surface);
  border-color: var(--color-surface);
  color: var(--color-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--sm {
  padding: 0.5rem 1.25rem;
  font-size: var(--font-size-sm);
}

.btn--lg {
  padding: 1rem 2.25rem;
  font-size: var(--font-size-lg);
}

/* --- Header --- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
  transition: box-shadow var(--transition-base);
}

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

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.header__logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.header__logo img {
  height: 38px;
  width: auto;
}

.header__nav {
  display: none;
  align-items: center;
  gap: var(--space-xl);
}

.nav-link {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  padding: var(--space-sm) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width var(--transition-base);
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  color: var(--color-accent);
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  width: 100%;
}

.header__cta {
  display: none;
}

.header__toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: var(--color-text);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.header__toggle:hover {
  background-color: var(--color-surface);
}

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

.header__toggle svg {
  width: 24px;
  height: 24px;
}

.header__toggle .icon-close {
  display: none;
}

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

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

@media (min-width: 1024px) {
  .header__nav {
    display: flex;
  }
  .header__cta {
    display: inline-flex;
  }
  .header__toggle {
    display: none;
  }
}

/* --- Mobile Menu --- */
.mobile-menu {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-white);
  z-index: 99;
  padding: var(--space-xl) var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  transform: translateX(100%);
  transition: transform var(--transition-base);
  overflow-y: auto;
}

.mobile-menu.is-open {
  transform: translateX(0);
}

.mobile-menu__link {
  display: block;
  padding: var(--space-md);
  color: var(--color-text);
  font-size: var(--font-size-lg);
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.mobile-menu__link:hover,
.mobile-menu__link[aria-current="page"] {
  background-color: var(--color-accent-light);
  color: var(--color-accent);
}

.mobile-menu__cta {
  margin-top: var(--space-md);
}

@media (min-width: 1024px) {
  .mobile-menu {
    display: none;
  }
}

/* --- Hero --- */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 50%, #1E4D8C 100%);
  color: var(--color-white);
  padding-block: var(--space-3xl);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: rgba(46, 124, 246, 0.08);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: rgba(46, 124, 246, 0.06);
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

.hero h1 {
  color: var(--color-white);
  margin-bottom: var(--space-lg);
  letter-spacing: -0.02em;
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: var(--space-xl);
  max-width: 560px;
}

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

@media (min-width: 1024px) {
  .hero {
    padding-block: 5rem;
  }
  .hero__subtitle {
    font-size: var(--font-size-xl);
  }
}

/* --- Page Hero (inner pages) --- */
.page-hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: var(--color-white);
  padding-block: var(--space-2xl);
  text-align: center;
}

.page-hero h1 {
  color: var(--color-white);
  margin-bottom: var(--space-sm);
}

.page-hero p {
  color: rgba(255, 255, 255, 0.85);
  font-size: var(--font-size-lg);
}

@media (min-width: 1024px) {
  .page-hero {
    padding-block: var(--space-3xl);
  }
}

/* --- Cards --- */
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

@media (min-width: 640px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .card-grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: transform var(--transition-base),
    box-shadow var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-lg);
  background-color: var(--color-accent-light);
  color: var(--color-accent);
}

.card__icon svg {
  width: 24px;
  height: 24px;
}

.card h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-sm);
}

.card p {
  font-size: var(--font-size-sm);
}

.card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  margin-top: var(--space-md);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.card__link svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}

.card__link:hover svg {
  transform: translateX(4px);
}

/* --- Features / Why Section --- */
.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

@media (min-width: 640px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.feature {
  display: flex;
  gap: var(--space-lg);
}

.feature__icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-accent-light);
  color: var(--color-accent);
}

.feature__icon svg {
  width: 20px;
  height: 20px;
}

.feature h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-xs);
}

.feature p {
  font-size: var(--font-size-sm);
}

/* --- Process Steps --- */
.process {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  counter-reset: step;
}

@media (min-width: 640px) {
  .process {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .process {
    grid-template-columns: repeat(4, 1fr);
  }
}

.process__step {
  text-align: center;
  counter-increment: step;
  position: relative;
}

.process__number {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-inline: auto;
  margin-bottom: var(--space-lg);
}

.process__step h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-sm);
}

.process__step p {
  font-size: var(--font-size-sm);
}

@media (min-width: 1024px) {
  .process__step:not(:last-child)::after {
    content: '';
    position: absolute;
    top: 28px;
    left: calc(50% + 36px);
    width: calc(100% - 72px);
    height: 2px;
    background: linear-gradient(to right, var(--color-accent), var(--color-border));
  }
}

/* --- CTA Section --- */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: var(--color-white);
  text-align: center;
  padding-block: var(--space-3xl);
}

.cta-section h2 {
  color: var(--color-white);
  margin-bottom: var(--space-md);
}

.cta-section p {
  color: rgba(255, 255, 255, 0.85);
  font-size: var(--font-size-lg);
  max-width: 560px;
  margin-inline: auto;
  margin-bottom: var(--space-xl);
}

/* --- Service Detail (services page) --- */
.service-detail {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  align-items: start;
}

@media (min-width: 768px) {
  .service-detail {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
  }
}

.service-detail__content h2 {
  margin-bottom: var(--space-md);
  font-size: var(--font-size-2xl);
}

.service-detail__content h3 {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
  margin-top: var(--space-lg);
}

.service-detail__content h3:first-of-type {
  margin-top: 0;
}

.service-detail__sidebar {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  border: 1px solid var(--color-border);
}

.service-detail__sidebar h4 {
  font-size: var(--font-size-base);
  margin-bottom: var(--space-md);
}

.outcome-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.outcome-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.outcome-list li svg {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  color: var(--color-success);
  margin-top: 2px;
}

.service-divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin-block: 0;
}

.service-note {
  background-color: var(--color-accent-light);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-sm);
  padding: var(--space-md) var(--space-lg);
  margin-top: var(--space-lg);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-style: italic;
}

/* --- About Page --- */
.about-mission {
  font-size: var(--font-size-lg);
  max-width: 700px;
}

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

@media (min-width: 640px) {
  .values-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.value-card {
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
}

.value-card__icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-accent-light);
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.value-card__icon svg {
  width: 20px;
  height: 20px;
}

.value-card h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-sm);
}

.value-card p {
  font-size: var(--font-size-sm);
}

.tech-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.tech-tag {
  display: inline-block;
  padding: var(--space-sm) var(--space-md);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* --- Contact Page --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
}

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

.contact-info__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.contact-info__icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-accent-light);
  color: var(--color-accent);
}

.contact-info__icon svg {
  width: 20px;
  height: 20px;
}

.contact-info__item h3 {
  font-size: var(--font-size-base);
  margin-bottom: var(--space-xs);
}

.contact-info__item p {
  font-size: var(--font-size-sm);
}

.contact-info__item a {
  font-weight: 500;
}

/* Form */
.form {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}

.form__notice {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-xl);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  text-align: center;
}

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

.form__label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.form__label .required {
  color: var(--color-error);
  margin-left: 2px;
}

.form__input,
.form__textarea {
  width: 100%;
  padding: 0.75rem var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  color: var(--color-text);
  transition: border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.form__input:focus,
.form__textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(46, 124, 246, 0.15);
}

.form__input.is-invalid,
.form__textarea.is-invalid {
  border-color: var(--color-error);
}

.form__error {
  display: none;
  font-size: var(--font-size-xs);
  color: var(--color-error);
  margin-top: var(--space-xs);
}

.form__input.is-invalid ~ .form__error,
.form__textarea.is-invalid ~ .form__error {
  display: block;
}

.form__textarea {
  min-height: 120px;
  resize: vertical;
}

.form__submit-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.form__success {
  display: none;
  padding: var(--space-md);
  background-color: #ecfdf5;
  border: 1px solid #a7f3d0;
  border-radius: var(--radius-md);
  color: var(--color-success);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-align: center;
}

.form__success.is-visible {
  display: block;
}

/* --- Footer --- */
.footer {
  background-color: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.75);
  padding-block: var(--space-3xl) var(--space-xl);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

@media (min-width: 640px) {
  .footer__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer__grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

.footer__brand img {
  height: 32px;
  width: auto;
  margin-bottom: var(--space-md);
  filter: brightness(0) invert(1);
}

.footer__brand p {
  color: rgba(255, 255, 255, 0.6);
  font-size: var(--font-size-sm);
  max-width: 280px;
}

.footer h4 {
  color: var(--color-white);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-md);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer__links a {
  color: rgba(255, 255, 255, 0.6);
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
}

.footer__links a:hover {
  color: var(--color-white);
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--space-xl);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-md);
}

.footer__bottom p {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.4);
}

/* --- 404 Page --- */
.error-page {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-block: var(--space-4xl);
  flex: 1;
}

.error-page__code {
  font-size: 6rem;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: var(--space-md);
}

.error-page h1 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-md);
}

.error-page p {
  font-size: var(--font-size-lg);
  max-width: 480px;
  margin-inline: auto;
  margin-bottom: var(--space-xl);
}

/* --- Scroll Reveal Animation --- */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }

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

  .reveal-delay-1 { transition-delay: 100ms; }
  .reveal-delay-2 { transition-delay: 200ms; }
  .reveal-delay-3 { transition-delay: 300ms; }
  .reveal-delay-4 { transition-delay: 400ms; }
}

/* Users who prefer reduced motion: no animation, just show */
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* --- Focus Visible --- */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* --- Utility --- */
.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;
}

.mb-0 { margin-bottom: 0; }
.text-xs { font-size: var(--font-size-xs); }

.container--centered {
  margin-inline: auto;
}

.btn--outline-light {
  background-color: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.4);
}

.btn--outline-light:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.7);
  color: var(--color-white);
  transform: translateY(-1px);
}

.tech-list--centered {
  justify-content: center;
}

.text-note {
  margin-top: var(--space-lg);
  font-size: var(--font-size-sm);
}

.contact-intro {
  margin-bottom: var(--space-2xl);
}

.contact-cta {
  margin-top: var(--space-xl);
}

.form__notice-icon {
  display: inline-block;
  vertical-align: middle;
  margin-right: 4px;
}

/* --- Print --- */
@media print {
  .header,
  .footer,
  .mobile-menu,
  .cta-section {
    display: none;
  }

  body {
    font-size: 12pt;
    color: #000;
  }

  a {
    color: #000;
    text-decoration: underline;
  }
}