/* ================================================
   CSS Custom Properties (CSS Variables)
   ================================================ */
:root {
  /* Colors */
  --color-primary: #1a365d;
  --color-primary-light: #2c5282;
  --color-primary-dark: #153050;
  --color-secondary: #ffffff;
  --color-accent: #3182ce;
  --color-accent-light: #4299e1;
  --color-text: #2d3748;
  --color-text-light: #4a5568;
  --color-background: #f7fafc;
  --color-border: #e2e8f0;
  --color-shadow: rgba(0, 0, 0, 0.1);
  
  /* Typography */
  --font-primary: 'Inter', 'Noto Sans JP', sans-serif;
  --font-size-base: 16px;
  --font-size-small: 0.875rem;
  --font-size-medium: 1.125rem;
  --font-size-large: 1.5rem;
  --font-size-xlarge: 2rem;
  --font-size-xxlarge: 3rem;
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-xxl: 3rem;
  --spacing-xxxl: 4rem;
  
  /* Layout */
  --container-max-width: 1200px;
  --header-height: 80px;
  
  /* Transitions */
  --transition-base: all 0.3s ease;
  --transition-fast: all 0.2s ease;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-full: 9999px;
}

/* ================================================
   Common Utility Classes
   ================================================ */
/* Container */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

/* Section Titles */
.section-title {
  font-size: var(--font-size-xlarge);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  text-align: center;
  margin-bottom: var(--spacing-md);
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xxl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* Grid Layouts */
.grid-3col {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

/* Card Components */
.card {
  background-color: var(--color-background);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  transition: var(--transition-base);
  border: 1px solid var(--color-border);
}

.card--secondary {
  background-color: var(--color-secondary);
  box-shadow: 0 4px 16px var(--color-shadow);
}

.card--hover-lift:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--color-shadow);
}

/* Icon Titles */
.icon-title {
  font-size: var(--font-size-medium);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.icon-title__icon {
  font-size: var(--font-size-large);
}

/* Button Hover Effects */
.hover-lift-small:hover {
  transform: translateY(-2px);
}

/* Form States */
.is-error {
  border-color: #e53e3e !important;
}

.contact__error {
  color: #e53e3e;
  font-size: 0.875rem;
  margin-top: 0.25rem;
  display: block;
}

.contact__success {
  background-color: #48bb78;
  color: white;
  padding: 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  text-align: center;
  animation: slideIn 0.3s ease-out;
}

.contact__success--fade-out {
  animation: slideOut 0.3s ease-out;
}

/* Animations */
@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideOut {
  from {
    opacity: 1;
    transform: translateY(0);
  }
  to {
    opacity: 0;
    transform: translateY(-10px);
  }
}

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

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  color: var(--color-text);
  line-height: 1.6;
  background-color: var(--color-secondary);
  overflow-x: hidden;
}

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

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

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

ul,
ol {
  list-style: none;
}

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

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

/* ================================================
   Header Styles
   ================================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: var(--color-secondary);
  box-shadow: 0 2px 10px var(--color-shadow);
  z-index: 1000;
}

.header__nav {
  height: 100%;
}

.header__container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo-link {
  font-size: var(--font-size-large);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  letter-spacing: 0.5px;
}

.header__menu {
  display: flex;
  gap: var(--spacing-xl);
}

.header__menu-link {
  color: var(--color-text);
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  transition: var(--transition-base);
}

.header__menu-link:hover {
  background-color: var(--color-background);
  color: var(--color-primary);
}

.header__mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: var(--spacing-sm);
}

.header__mobile-toggle-line {
  width: 24px;
  height: 2px;
  background-color: var(--color-primary);
  transition: var(--transition-base);
}

/* ================================================
   Hero Section
   ================================================ */
.hero {
  padding-top: calc(var(--header-height) + var(--spacing-xxxl));
  padding-bottom: var(--spacing-xxxl);
  background: linear-gradient(135deg, var(--color-background) 0%, var(--color-secondary) 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero__container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
  text-align: center;
}

.hero__title {
  font-size: var(--font-size-xxlarge);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.2;
}

.hero__title-accent {
  color: var(--color-accent);
  display: inline-block;
  position: relative;
}

.hero__description {
  font-size: var(--font-size-medium);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xxl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

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

.hero__cta {
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-semibold);
  transition: var(--transition-base);
  display: inline-block;
  text-decoration: none;
  outline: none;
  position: relative;
}

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

.hero__cta--primary {
  background-color: var(--color-accent);
  color: var(--color-secondary);
}

.hero__cta--primary:hover,
.hero__cta--primary:focus {
  background-color: var(--color-accent-light);
  color: var(--color-secondary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(49, 130, 206, 0.3);
}

.hero__cta--primary:active {
  transform: translateY(0);
}

.hero__cta--secondary {
  border: 2px solid var(--color-accent);
  color: var(--color-accent);
}

.hero__cta--secondary:hover,
.hero__cta--secondary:focus {
  background-color: var(--color-accent);
  color: var(--color-secondary);
}

.hero__cta--secondary:active {
  transform: translateY(0);
}

/* Hero Features */
.hero__features {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xxl);
  flex-wrap: wrap;
}

.hero__feature {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: rgba(26, 54, 93, 0.1);
  border-radius: var(--radius-full);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(26, 54, 93, 0.2);
  color: var(--color-primary);
}

.hero__feature-icon {
  font-size: var(--font-size-large);
}

.hero__feature-text {
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
}


/* ================================================
   Services Section
   ================================================ */
.services {
  padding: var(--spacing-xxxl) 0;
  background-color: var(--color-secondary);
}

.services__grid {
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
}

.service-card {
  padding: var(--spacing-xxl);
}

.service-card__icon {
  color: var(--color-accent);
  margin-bottom: var(--spacing-lg);
}

.service-card__title {
  font-size: var(--font-size-large);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.service-card__description {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-lg);
  line-height: 1.8;
}

.service-card__features {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.service-card__features li {
  padding-left: var(--spacing-lg);
  position: relative;
  color: var(--color-text);
}

.service-card__features li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: var(--font-weight-bold);
}

/* ================================================
   About Section
   ================================================ */
.about {
  padding: var(--spacing-xxxl) 0;
  background-color: var(--color-background);
}

/* Mission & Vision */
.about__mission-vision {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xxxl);
}

.about__mission,
.about__vision {
  padding: var(--spacing-xxl);
}

.about__mission-title,
.about__vision-title {
  font-size: var(--font-size-large);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.about__mission-headline,
.about__vision-headline {
  font-size: var(--font-size-medium);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--spacing-lg);
}

.about__mission-description {
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: var(--spacing-lg);
}

.about__mission-benefits,
.about__vision-goals {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.about__mission-benefits li,
.about__vision-goals li {
  padding-left: var(--spacing-lg);
  position: relative;
  color: var(--color-text);
}

.about__mission-benefits li::before,
.about__vision-goals li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: var(--font-weight-bold);
}


/* ================================================
   Portfolio Section
   ================================================ */
.portfolio {
  padding: var(--spacing-xxxl) 0;
  background-color: var(--color-background);
}

.portfolio__container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.portfolio__title {
  font-size: var(--font-size-xlarge);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  text-align: center;
  margin-bottom: var(--spacing-md);
}

.portfolio__subtitle {
  text-align: center;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xxl);
}

.portfolio__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-xl);
}

.portfolio__item {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: var(--transition-base);
}

.portfolio__item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.portfolio__image {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.portfolio__overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(26, 54, 93, 0.95), transparent);
  color: var(--color-secondary);
  padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-lg);
  transform: translateY(100%);
  transition: var(--transition-base);
}

.portfolio__item:hover .portfolio__overlay {
  transform: translateY(0);
}

.portfolio__item-title {
  font-size: var(--font-size-medium);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-sm);
}

.portfolio__item-description {
  font-size: var(--font-size-small);
  opacity: 0.9;
}

/* ================================================
   Technology Section
   ================================================ */
.technology {
  padding: var(--spacing-xxxl) 0;
  background-color: var(--color-background);
}

.technology__container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.technology__title {
  font-size: var(--font-size-xlarge);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  text-align: center;
  margin-bottom: var(--spacing-md);
}

.technology__subtitle {
  text-align: center;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xxl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.technology__content {
  max-width: 1000px;
  margin: 0 auto;
}

.technology__intro {
  text-align: center;
  font-size: var(--font-size-medium);
  color: var(--color-text);
  margin-bottom: var(--spacing-xxl);
  line-height: 1.8;
}

.technology__features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xxl);
}

.technology__feature {
  background-color: var(--color-secondary);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 16px var(--color-shadow);
  transition: var(--transition-base);
}

.technology__feature:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--color-shadow);
}

.technology__feature-title {
  font-size: var(--font-size-medium);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.technology__feature-icon {
  font-size: var(--font-size-large);
}

.technology__feature-description {
  color: var(--color-text-light);
  line-height: 1.8;
}

.technology__commitment {
  background-color: var(--color-primary);
  color: var(--color-secondary);
  padding: var(--spacing-xxl);
  border-radius: var(--radius-lg);
  text-align: center;
}

.technology__commitment-title {
  font-size: var(--font-size-large);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-lg);
}

.technology__commitment-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  max-width: 600px;
  margin: 0 auto;
  text-align: left;
}

.technology__commitment-list li {
  padding-left: var(--spacing-xl);
  position: relative;
}

.technology__commitment-list li::before {
  content: "✅";
  position: absolute;
  left: 0;
  font-size: var(--font-size-medium);
}

/* ================================================
   Contact Section
   ================================================ */
.contact {
  padding: var(--spacing-xxxl) 0;
  background-color: var(--color-secondary);
}

.contact__intro {
  text-align: center;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xxl);
  font-size: var(--font-size-medium);
}

/* Contact Methods */
.contact__methods {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xxl);
}

.contact__method {
  background-color: var(--color-background);
  padding: var(--spacing-xxl);
  border-radius: var(--radius-lg);
  text-align: center;
  border: 1px solid var(--color-border);
  transition: var(--transition-base);
}

.contact__method:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.contact__method--line {
  border-left: 4px solid #00B900;
}

.contact__method--email {
  border-left: 4px solid var(--color-accent);
}

.contact__method-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-lg);
}

.contact__method-title {
  font-size: var(--font-size-large);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.contact__method-description {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-lg);
  line-height: 1.6;
}

/* LINE Button */
.contact__line-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  background: #00B900;
  color: white;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: var(--font-weight-semibold);
  transition: var(--transition-base);
  margin-bottom: var(--spacing-md);
}

.contact__line-btn:hover {
  background: #009900;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 185, 0, 0.3);
}

.contact__line-icon {
  font-size: var(--font-size-medium);
}

/* Email Button */
.contact__email-btn {
  background: var(--color-accent);
  color: white;
  padding: var(--spacing-md) var(--spacing-xl);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-weight: var(--font-weight-semibold);
  transition: var(--transition-base);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-base);
}

.contact__email-btn:hover {
  background: var(--color-accent-light);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(49, 130, 206, 0.3);
}

.contact__response-time {
  color: var(--color-text-light);
  font-size: var(--font-size-small);
  font-style: italic;
}

/* Email Form Container */
.contact__email-form-container {
  background-color: var(--color-background);
  padding: var(--spacing-xxl);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-xxl);
  border: 1px solid var(--color-border);
}

.contact__form {
  max-width: 600px;
  margin: 0 auto;
}

.contact__form-group {
  margin-bottom: var(--spacing-lg);
}

.contact__label {
  display: block;
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.contact__input,
.contact__select,
.contact__textarea {
  width: 100%;
  padding: var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: var(--color-secondary);
  transition: var(--transition-base);
  font-family: var(--font-primary);
}

.contact__input:focus,
.contact__select:focus,
.contact__textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(49, 130, 206, 0.1);
}

.contact__textarea {
  resize: vertical;
  min-height: 120px;
  font-family: var(--font-primary);
}

.contact__submit {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-xl);
  background-color: var(--color-accent);
  color: var(--color-secondary);
  font-weight: var(--font-weight-semibold);
  border: none;
  border-radius: var(--radius-md);
  transition: var(--transition-base);
  font-size: var(--font-size-medium);
  cursor: pointer;
}

.contact__submit:hover {
  background-color: var(--color-accent-light);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(49, 130, 206, 0.3);
}

/* Response Info */
.contact__response-info {
  background-color: var(--color-background);
  padding: var(--spacing-xl);
  border-radius: var(--radius-md);
  text-align: center;
  border: 1px solid var(--color-border);
}

.contact__response-info-title {
  font-size: var(--font-size-medium);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  margin-bottom: var(--spacing-md);
}

.contact__response-info-text {
  color: var(--color-text-light);
  line-height: 1.6;
}

.contact__response-info-text small {
  display: block;
  margin-top: var(--spacing-sm);
  color: var(--color-text);
}

/* ================================================
   Footer Styles
   ================================================ */
.footer {
  background-color: var(--color-primary);
  color: var(--color-secondary);
  padding: var(--spacing-xxl) 0 var(--spacing-lg);
}

.footer__container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.footer__content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--spacing-xxl);
  margin-bottom: var(--spacing-xxl);
}

.footer__logo {
  font-size: var(--font-size-large);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
}

.footer__tagline {
  color: rgba(255, 255, 255, 0.8);
  font-size: var(--font-size-small);
}

.footer__nav-title,
.footer__social-title {
  font-size: var(--font-size-medium);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-md);
}

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

.footer__nav-link {
  color: rgba(255, 255, 255, 0.8);
  transition: var(--transition-fast);
}

.footer__nav-link:hover {
  color: var(--color-secondary);
}

.footer__social-links {
  display: flex;
  gap: var(--spacing-md);
}

.footer__social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  color: var(--color-secondary);
  transition: var(--transition-base);
}

.footer__social-link:hover {
  background-color: var(--color-accent);
  transform: translateY(-2px);
}

.footer__bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer__copyright {
  color: rgba(255, 255, 255, 0.8);
  font-size: var(--font-size-small);
}

/* ================================================
   Footer
   ================================================ */
.footer {
  background-color: var(--color-primary);
  color: var(--color-secondary);
  padding: var(--spacing-xxl) 0 var(--spacing-xl);
}

.footer__container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.footer__content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xxl);
  margin-bottom: var(--spacing-xxl);
}

.footer__brand-name {
  font-size: var(--font-size-large);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
}

.footer__brand-tagline {
  opacity: 0.8;
}

.footer__nav-title {
  font-size: var(--font-size-medium);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-md);
}

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

.footer__nav-link {
  color: var(--color-secondary);
  opacity: 0.8;
  transition: var(--transition-fast);
}

.footer__nav-link:hover {
  opacity: 1;
  color: var(--color-secondary);
}

.footer__social {
  display: flex;
  gap: var(--spacing-md);
}

.footer__social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--color-secondary);
  transition: var(--transition-base);
}

.footer__social-link:hover {
  background-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-xl);
  text-align: center;
}

.footer__copyright {
  opacity: 0.8;
}

/* ================================================
   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;
}