/* ==========================================================================
   MTagent — Main Stylesheet
   Mobile-first, dark theme, fully responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   Custom Properties
   -------------------------------------------------------------------------- */
:root {
  /* Colors — Dark theme */
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #1a1a2e;
  --bg-card-hover: #22223a;
  --text-primary: #f0f0f5;
  --text-secondary: #a0a0b5;
  --text-muted: #6b6b80;
  --accent-blue: #00d4ff;
  --accent-purple: #7c3aed;
  --accent-gradient: linear-gradient(135deg, #00d4ff, #7c3aed);
  --border-color: rgba(255, 255, 255, 0.08);
  --success: #10b981;
  --error: #ef4444;

  /* Fluid Typography */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-hero: clamp(2.5rem, 0.5rem + 7vw, 6rem);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Layout */
  --content-narrow: 42rem;
  --content-default: 60rem;
  --content-wide: 75rem;
  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

/* Light theme overrides */
[data-theme="light"] {
  --bg-primary: #f5f5fa;
  --bg-secondary: #eeeef5;
  --bg-card: #ffffff;
  --bg-card-hover: #f0f0f8;
  --text-primary: #1a1a2e;
  --text-secondary: #4a4a60;
  --text-muted: #8888a0;
  --accent-blue: #0099cc;
  --accent-purple: #6d28d9;
  --accent-gradient: linear-gradient(135deg, #0099cc, #6d28d9);
  --border-color: rgba(0, 0, 0, 0.08);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg-primary: #f5f5fa;
    --bg-secondary: #eeeef5;
    --bg-card: #ffffff;
    --bg-card-hover: #f0f0f8;
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a60;
    --text-muted: #8888a0;
    --accent-blue: #0099cc;
    --accent-purple: #6d28d9;
    --accent-gradient: linear-gradient(135deg, #0099cc, #6d28d9);
    --border-color: rgba(0, 0, 0, 0.08);
  }
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body.nav-open {
  overflow: hidden;
}

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

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

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

ul,
ol {
  list-style: none;
}

button,
input,
textarea {
  font: inherit;
  color: inherit;
  border: none;
  background: none;
}

button {
  cursor: pointer;
}

/* --------------------------------------------------------------------------
   Skip Link
   -------------------------------------------------------------------------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 1000;
  padding: var(--space-3) var(--space-4);
  background: var(--accent-blue);
  color: var(--bg-primary);
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-4);
}

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--content-default);
  margin-inline: auto;
  padding-inline: clamp(var(--space-4), 5vw, var(--space-8));
}

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

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

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 15, 0.8);
  backdrop-filter: blur(1rem);
  -webkit-backdrop-filter: blur(1rem);
  border-bottom: 0.0625rem solid var(--border-color);
  transition: background var(--transition-base);
}

[data-theme="light"] .nav {
  background: rgba(245, 245, 250, 0.85);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 3.5rem;
  gap: var(--space-4);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--text-primary);
  font-weight: 700;
  font-size: var(--text-lg);
  text-decoration: none;
  flex-shrink: 0;
}

.nav__logo:hover {
  color: var(--accent-blue);
}

.nav__logo-icon {
  font-size: 1.5em;
  line-height: 1;
}

.nav__toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.3125rem;
  width: 2.75rem;
  height: 2.75rem;
  align-items: center;
  z-index: 110;
}

.nav__toggle-bar {
  display: block;
  width: 1.375rem;
  height: 0.125rem;
  background: var(--text-primary);
  border-radius: 0.125rem;
  transition: transform var(--transition-base), opacity var(--transition-fast);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(1) {
  transform: translateY(0.4375rem) rotate(45deg);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(3) {
  transform: translateY(-0.4375rem) rotate(-45deg);
}

.nav__menu {
  position: fixed;
  inset: 0;
  z-index: 105;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  background: var(--bg-primary);
  transform: translateX(100%);
  transition: transform var(--transition-slow);
}

.nav__menu--open {
  transform: translateX(0);
}

.nav__list {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
}

.nav__link {
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--text-secondary);
  padding: var(--space-2) var(--space-4);
  min-height: 2.75rem;
  display: flex;
  align-items: center;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav__link:hover,
.nav__link--active {
  color: var(--accent-blue);
}

.nav__link:focus-visible {
  outline: 0.125rem solid var(--accent-blue);
  outline-offset: 0.125rem;
}

/* Desktop nav */
@media (min-width: 48em) {
  .nav__toggle {
    display: none;
  }

  .nav__menu {
    position: static;
    transform: none;
    flex-direction: row;
    background: transparent;
    gap: var(--space-2);
  }

  .nav__list {
    flex-direction: row;
    gap: var(--space-1);
  }

  .nav__link {
    font-size: var(--text-sm);
    padding: var(--space-2) var(--space-3);
  }
}

/* --------------------------------------------------------------------------
   Theme Toggle
   -------------------------------------------------------------------------- */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  background: var(--bg-card);
  border: 0.0625rem solid var(--border-color);
  transition: background var(--transition-fast), transform var(--transition-fast);
  flex-shrink: 0;
}

.theme-toggle:hover {
  background: var(--bg-card-hover);
  transform: rotate(15deg);
}

.theme-toggle:focus-visible {
  outline: 0.125rem solid var(--accent-blue);
  outline-offset: 0.125rem;
}

.theme-toggle__icon--light {
  display: none;
}

[data-theme="light"] .theme-toggle__icon--dark {
  display: none;
}

[data-theme="light"] .theme-toggle__icon--light {
  display: inline;
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: var(--space-16) 0;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(0, 212, 255, 0.12) 0%, transparent 60%),
    radial-gradient(ellipse 60% 80% at 80% 50%, rgba(124, 58, 237, 0.1) 0%, transparent 60%),
    radial-gradient(ellipse 50% 50% at 20% 80%, rgba(0, 212, 255, 0.06) 0%, transparent 60%);
  animation: heroPulse 8s ease-in-out infinite alternate;
}

@keyframes heroPulse {
  0% {
    opacity: 0.7;
    transform: scale(1);
  }
  100% {
    opacity: 1;
    transform: scale(1.05);
  }
}

.hero__glow {
  position: absolute;
  top: 50%;
  left: 50%;
  width: min(40rem, 80vw);
  aspect-ratio: 1;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(0, 212, 255, 0.08) 0%, transparent 70%);
  animation: glowFloat 6s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes glowFloat {
  0% {
    transform: translate(-50%, -50%) scale(1);
  }
  100% {
    transform: translate(-50%, -52%) scale(1.1);
  }
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero__title {
  font-size: var(--text-hero);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-4);
}

.hero__title-accent {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero__subtitle {
  font-size: var(--text-xl);
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
  font-weight: 300;
}

.hero__desc {
  font-size: var(--text-base);
  color: var(--text-muted);
  max-width: var(--content-narrow);
  margin-inline: auto;
  margin-bottom: var(--space-8);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  justify-content: center;
}

.hero__scroll {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
}

.hero__scroll-indicator {
  display: block;
  width: 1.5rem;
  height: 2.5rem;
  border: 0.125rem solid var(--text-muted);
  border-radius: 1rem;
  position: relative;
}

.hero__scroll-indicator::before {
  content: '';
  position: absolute;
  top: 0.375rem;
  left: 50%;
  transform: translateX(-50%);
  width: 0.25rem;
  height: 0.5rem;
  background: var(--accent-blue);
  border-radius: 0.25rem;
  animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {
  0%, 100% { transform: translateX(-50%) translateY(0); opacity: 1; }
  50% { transform: translateX(-50%) translateY(0.625rem); opacity: 0.3; }
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  min-height: 2.75rem;
  min-width: 2.75rem;
  transition: all var(--transition-base);
  text-decoration: none;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.btn:focus-visible {
  outline: 0.125rem solid var(--accent-blue);
  outline-offset: 0.125rem;
}

.btn--primary {
  background: var(--accent-gradient);
  color: #fff;
  border: none;
}

.btn--primary:hover {
  transform: translateY(-0.125rem);
  box-shadow:
    0 0.5rem 1.5rem rgba(0, 212, 255, 0.25),
    0 0.25rem 0.5rem rgba(124, 58, 237, 0.2);
  color: #fff;
}

.btn--outline {
  background: transparent;
  color: var(--text-primary);
  border: 0.0625rem solid var(--border-color);
}

.btn--outline:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  background: rgba(0, 212, 255, 0.05);
}

.btn--full {
  width: 100%;
}

.btn--loading .btn__text {
  opacity: 0;
}

.btn--loading .btn__loader {
  position: absolute;
  width: 1.25rem;
  height: 1.25rem;
  border: 0.125rem solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* --------------------------------------------------------------------------
   Sections
   -------------------------------------------------------------------------- */
.section {
  padding: clamp(var(--space-12), 8vw, var(--space-24)) 0;
}

.section--alt {
  background: var(--bg-secondary);
}

.section__header {
  text-align: center;
  margin-bottom: clamp(var(--space-8), 5vw, var(--space-16));
}

.section__eyebrow {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent-blue);
  margin-bottom: var(--space-3);
}

.section__title {
  font-size: var(--text-2xl);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-4);
}

.section__lead {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-width: var(--content-narrow);
  margin-inline: auto;
  line-height: 1.5;
}

/* --------------------------------------------------------------------------
   Problem Cards
   -------------------------------------------------------------------------- */
.problem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(18rem, 100%), 1fr));
  gap: var(--space-6);
}

.problem-card {
  padding: var(--space-6);
  background: var(--bg-card);
  border: 0.0625rem solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.problem-card:hover {
  transform: translateY(-0.25rem);
  box-shadow: 0 0.5rem 2rem rgba(0, 0, 0, 0.2);
}

.problem-card__icon {
  font-size: var(--text-2xl);
  display: block;
  margin-bottom: var(--space-4);
}

.problem-card__title {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.problem-card__text {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   Solution Cards
   -------------------------------------------------------------------------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(18rem, 100%), 1fr));
  gap: var(--space-6);
}

.card {
  position: relative;
  padding: var(--space-8) var(--space-6);
  background: var(--bg-card);
  border: 0.0625rem solid var(--border-color);
  border-radius: var(--radius-xl);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  outline: none;
}

.card:hover,
.card:focus-visible {
  transform: translateY(-0.375rem);
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow:
    0 0.5rem 2rem rgba(0, 0, 0, 0.25),
    0 0 2.5rem rgba(0, 212, 255, 0.08);
}

.card:focus-visible {
  outline: 0.125rem solid var(--accent-blue);
  outline-offset: 0.125rem;
}

.card__icon-wrapper {
  width: 3.5rem;
  height: 3.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 212, 255, 0.08);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
}

.card__icon {
  font-size: 1.75rem;
  line-height: 1;
}

.card__title {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-3);
}

.card__text {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.65;
}

.card__tag {
  display: inline-block;
  margin-top: var(--space-4);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 600;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  border: 0.0625rem solid rgba(0, 212, 255, 0.2);
  border-radius: var(--radius-sm);
}

/* --------------------------------------------------------------------------
   Flow Diagram
   -------------------------------------------------------------------------- */
.flow-diagram {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
}

@media (min-width: 48em) {
  .flow-diagram {
    flex-direction: row;
    justify-content: center;
    gap: var(--space-6);
  }
}

.flow-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  text-align: center;
}

.flow-step__circle {
  width: 4.5rem;
  height: 4.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  background: var(--bg-card);
  border: 0.125rem solid var(--border-color);
  border-radius: 50%;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.flow-step:hover .flow-step__circle {
  border-color: var(--accent-blue);
  box-shadow: 0 0 1.5rem rgba(0, 212, 255, 0.15);
}

.flow-step__label {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--text-primary);
}

.flow-step__desc {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.flow-arrow {
  width: 0.125rem;
  height: 2rem;
  position: relative;
  background: var(--accent-gradient);
}

.flow-arrow::after {
  content: '';
  position: absolute;
  bottom: -0.375rem;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 0.375rem solid transparent;
  border-right: 0.375rem solid transparent;
  border-top: 0.5rem solid var(--accent-purple);
}

@media (min-width: 48em) {
  .flow-arrow {
    width: 3rem;
    height: 0.125rem;
  }

  .flow-arrow::after {
    bottom: auto;
    top: 50%;
    left: auto;
    right: -0.375rem;
    transform: translateY(-50%);
    border-left: 0.5rem solid var(--accent-purple);
    border-right: none;
    border-top: 0.375rem solid transparent;
    border-bottom: 0.375rem solid transparent;
  }
}

/* --------------------------------------------------------------------------
   Tech Grid
   -------------------------------------------------------------------------- */
.tech-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-4);
}

.tech-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-6) var(--space-4);
  background: var(--bg-card);
  border: 0.0625rem solid var(--border-color);
  border-radius: var(--radius-lg);
  min-width: 8rem;
  flex: 0 1 auto;
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.tech-badge:hover {
  transform: translateY(-0.25rem);
  border-color: var(--accent-blue);
}

.tech-badge__icon {
  font-size: 2rem;
  line-height: 1;
}

.tech-badge__name {
  font-size: var(--text-sm);
  font-weight: 700;
}

.tech-badge__desc {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   Contact Form
   -------------------------------------------------------------------------- */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-primary);
}

.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  background: var(--bg-card);
  border: 0.0625rem solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  min-height: 2.75rem;
}

.form-input::placeholder {
  color: var(--text-muted);
}

.form-input:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 0.1875rem rgba(0, 212, 255, 0.15);
}

.form-input:focus-visible {
  outline: 0.125rem solid var(--accent-blue);
  outline-offset: 0.0625rem;
}

.form-input--textarea {
  resize: vertical;
  min-height: 8rem;
}

.form-input--valid {
  border-color: var(--success);
}

.form-input--valid:focus {
  box-shadow: 0 0 0 0.1875rem rgba(16, 185, 129, 0.15);
}

.form-input--invalid {
  border-color: var(--error);
}

.form-input--invalid:focus {
  box-shadow: 0 0 0 0.1875rem rgba(239, 68, 68, 0.15);
}

.form-error {
  font-size: var(--text-xs);
  color: var(--error);
  min-height: 1.25rem;
}

.form-status {
  text-align: center;
  padding: var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
}

.form-status--success {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
  border: 0.0625rem solid rgba(16, 185, 129, 0.3);
}

.form-status--error {
  background: rgba(239, 68, 68, 0.1);
  color: var(--error);
  border: 0.0625rem solid rgba(239, 68, 68, 0.3);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  padding: var(--space-8) 0;
  border-top: 0.0625rem solid var(--border-color);
  background: var(--bg-secondary);
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  text-align: center;
}

@media (min-width: 48em) {
  .footer__inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  font-size: var(--text-lg);
}

.footer__copy {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.footer__links {
  display: flex;
  gap: var(--space-4);
}

.footer__link {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  padding: var(--space-1) var(--space-2);
  min-height: 2.75rem;
  display: flex;
  align-items: center;
}

.footer__link:hover {
  color: var(--accent-blue);
}

.footer__link:focus-visible {
  outline: 0.125rem solid var(--accent-blue);
  outline-offset: 0.125rem;
  border-radius: var(--radius-sm);
}

/* --------------------------------------------------------------------------
   Scroll Animations
   -------------------------------------------------------------------------- */
.animate-in {
  opacity: 0;
  transform: translateY(1.5rem);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.animate-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children */
.card-grid .animate-in:nth-child(2) { transition-delay: 100ms; }
.card-grid .animate-in:nth-child(3) { transition-delay: 200ms; }
.card-grid .animate-in:nth-child(4) { transition-delay: 300ms; }
.problem-grid .animate-in:nth-child(2) { transition-delay: 100ms; }
.problem-grid .animate-in:nth-child(3) { transition-delay: 200ms; }

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

  html {
    scroll-behavior: auto;
  }

  .animate-in {
    opacity: 1;
    transform: none;
  }
}

/* --------------------------------------------------------------------------
   Focus Visible Global
   -------------------------------------------------------------------------- */
:focus-visible {
  outline: 0.125rem solid var(--accent-blue);
  outline-offset: 0.125rem;
}

:focus:not(:focus-visible) {
  outline: none;
}

/* --------------------------------------------------------------------------
   Selection
   -------------------------------------------------------------------------- */
::selection {
  background: rgba(0, 212, 255, 0.3);
  color: var(--text-primary);
}