/* ==========================================================================
   Footer Styles
   ========================================================================== 
   
   Architecture:
   - Glassmorphism matching navigation
   - Rounded top edges
   - 4-column responsive grid
   - Brand with "Portfolio." (red dot)
   - Smooth hover animations using transform/opacity
   
   ========================================================================== */

.footer {
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border-top-left-radius: var(--radius-3xl);
  border-top-right-radius: var(--radius-3xl);
  margin-top: var(--space-20);
  padding: var(--space-12) 0 var(--space-6);
  border-top: var(--glass-border);

  /* Theme transitions */
  transition:
    background var(--duration-slow) var(--ease-in-out),
    border-color var(--duration-slow) var(--ease-in-out);
}

.footer__container {
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

/* ==========================================================================
   BRAND SECTION - "Portfolio." with red dot
   ========================================================================== */

.footer__brand {
  max-width: 320px;
}

.footer__logo {
  display: flex;
  align-items: baseline;
  margin-bottom: var(--space-3);
}

.footer__logo-text {
  font-family: var(--font-family-sans);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  letter-spacing: var(--letter-spacing-tight);
}

.footer__logo-dot {
  font-family: var(--font-family-serif);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  font-style: italic;
  color: var(--color-tertiary); /* Red dot */
  margin-left: -2px;
}

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

/* ==========================================================================
   SECTION TITLES
   ========================================================================== */

.footer__title {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wide);
  margin-bottom: var(--space-4);
  color: var(--color-text);
}

/* ==========================================================================
   QUICK LINKS
   ========================================================================== */

.footer__links ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer__links a {
  display: inline-block;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-decoration: none;

  transition:
    color var(--duration-normal) var(--ease-in-out),
    transform var(--duration-fast) var(--ease-out);
}

.footer__links a:hover {
  color: var(--color-primary);
  transform: translateX(4px);
}

.footer__links a:focus-visible {
  outline: var(--focus-ring-width) solid var(--color-focus-ring);
  outline-offset: var(--focus-ring-offset);
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   SOCIAL LINKS
   ========================================================================== */

.footer__social-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.footer__social-links a {
  width: var(--space-10); /* 40px */
  height: var(--space-10);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background-color: var(--color-surface-secondary);
  color: var(--color-text-secondary);
  text-decoration: none;

  /* Performance-optimized transitions */
  transition:
    background-color var(--duration-normal) var(--ease-in-out),
    color var(--duration-normal) var(--ease-in-out),
    transform var(--duration-fast) var(--ease-out);
}

.footer__social-links a:hover {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  transform: translateY(-2px);
}

.footer__social-links a:focus-visible {
  outline: var(--focus-ring-width) solid var(--color-focus-ring);
  outline-offset: var(--focus-ring-offset);
}

.footer__social-links svg,
.footer__social-links i,
.footer__social-links img {
  width: var(--icon-size-sm); /* 18px */
  height: var(--icon-size-sm);
  stroke-width: var(--icon-stroke-default);
}

/* ==========================================================================
   CONTACT
   ========================================================================== */

.footer__contact {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__contact a {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-decoration: none;

  transition:
    color var(--duration-normal) var(--ease-in-out),
    transform var(--duration-fast) var(--ease-out);
}

.footer__contact a:hover {
  color: var(--color-primary);
  transform: translateX(4px);
}

.footer__contact a:focus-visible {
  outline: var(--focus-ring-width) solid var(--color-focus-ring);
  outline-offset: var(--focus-ring-offset);
  border-radius: var(--radius-sm);
}

.footer__contact svg,
.footer__contact i {
  width: var(--icon-size-sm);
  height: var(--icon-size-sm);
  flex-shrink: 0;
  stroke-width: var(--icon-stroke-default);
}

/* ==========================================================================
   BOTTOM BAR
   ========================================================================== */

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border-subtle);
}

.footer__bottom p {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  margin: 0;
}

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

.footer__legal a {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  text-decoration: none;

  transition: color var(--duration-normal) var(--ease-in-out);
}

.footer__legal a:hover {
  color: var(--color-primary);
}

.footer__legal a:focus-visible {
  outline: var(--focus-ring-width) solid var(--color-focus-ring);
  outline-offset: var(--focus-ring-offset);
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   RESPONSIVE - Tablet (< 1024px)
   ========================================================================== */

@media (max-width: 1023px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer__brand {
    grid-column: 1 / -1;
    max-width: none;
    text-align: center;
    margin-bottom: var(--space-4);
  }

  .footer__logo {
    justify-content: center;
  }
}

/* ==========================================================================
   RESPONSIVE - Mobile (< 768px)
   ========================================================================== */

@media (max-width: 767px) {
  .footer {
    padding: var(--space-8) 0 var(--space-4);
    border-top-left-radius: var(--radius-2xl);
    border-top-right-radius: var(--radius-2xl);
  }

  .footer__container {
    padding: 0 var(--space-4);
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
    text-align: center;
  }

  .footer__brand {
    margin-bottom: var(--space-2);
  }

  .footer__links ul {
    align-items: center;
  }

  .footer__social-links {
    justify-content: center;
  }

  .footer__contact {
    align-items: center;
  }

  .footer__contact a:hover {
    transform: none;
  }

  .footer__bottom {
    flex-direction: column;
    text-align: center;
    gap: var(--space-3);
  }

  .footer__legal {
    justify-content: center;
  }
}

/* Visually hidden helper for screen readers */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}