/**
 * Footer Styles - Refined Industrial Minimalism
 * Inspired by: Vercel, Linear, Stripe, Next.js
 *
 * Design Philosophy:
 * - Precision typography with DM Sans for clarity
 * - Subtle depth through layering and micro-shadows
 * - Restrained animation focused on meaningful moments
 * - Monochromatic blue with strategic cyan accents
 *
 * @package Flavor_Starter
 */

/* ============================================
   CSS Variables & Design Tokens
   ============================================ */

.ta-footer {
  --footer-spacing-unit: 0.25rem;
  --footer-radius-sm: 6px;
  --footer-radius-md: 10px;
  --footer-radius-lg: 14px;

  /* Color System - Refined Blues */
  --footer-bg-primary: #0a1628;
  --footer-bg-secondary: #0f1f3a;
  --footer-border-subtle: rgba(100, 149, 237, 0.08);
  --footer-border-accent: rgba(100, 149, 237, 0.2);

  --footer-text-primary: #e2e8f0;
  --footer-text-secondary: #94a3b8;
  --footer-text-muted: #64748b;

  --footer-accent-cyan: #22d3ee;
  --footer-accent-blue: #3b82f6;
  --footer-accent-purple: #8b5cf6;

  /* Typography Scale */
  --footer-text-xs: 0.75rem;
  --footer-text-sm: 0.875rem;
  --footer-text-base: 1rem;
  --footer-text-lg: 1.125rem;

  /* Shadows - Subtle Depth */
  --footer-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --footer-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --footer-shadow-glow: 0 0 15px rgba(34, 211, 238, 0.15);

  /* Transitions */
  --footer-transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --footer-transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --footer-transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   Main Footer Container
   ============================================ */

.ta-footer {
  position: relative;
  width: 100%;
  background: linear-gradient(
    180deg,
    var(--footer-bg-primary) 0%,
    var(--footer-bg-secondary) 100%
  );
  color: var(--footer-text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans",
    Helvetica, Arial, sans-serif;
  border-top: 1px solid var(--footer-border-subtle);
}

/* Atmospheric Background Pattern */
.ta-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 100%;
  background-image: radial-gradient(
      circle at 20% 20%,
      rgba(59, 130, 246, 0.03) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 80% 80%,
      rgba(34, 211, 238, 0.02) 0%,
      transparent 50%
    );
  pointer-events: none;
  z-index: 0;
}

.ta-footer__main {
  position: relative;
  z-index: 1;
  padding: calc(var(--footer-spacing-unit) * 20) 0 0 0;
}

@media (min-width: 768px) {
  .ta-footer__main {
    padding: calc(var(--footer-spacing-unit) * 24) 0 0 0;
  }
}

/* Container */
.ta-footer__container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 calc(var(--footer-spacing-unit) * 6);
}

@media (min-width: 640px) {
  .ta-footer__container {
    padding: 0 calc(var(--footer-spacing-unit) * 8);
  }
}

@media (min-width: 1024px) {
  .ta-footer__container {
    padding: 0 calc(var(--footer-spacing-unit) * 10);
  }
}

/* ============================================
   Grid Layout - Asymmetric Beauty
   ============================================ */

.ta-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: calc(var(--footer-spacing-unit) * 12);
}

@media (min-width: 768px) {
  .ta-footer__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: calc(var(--footer-spacing-unit) * 14);
  }
}

@media (min-width: 1024px) {
  .ta-footer__grid {
    grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
    gap: calc(var(--footer-spacing-unit) * 16);
  }
}

/* ============================================
   Column Styling
   ============================================ */

.ta-footer__column {
  display: flex;
  flex-direction: column;
  gap: calc(var(--footer-spacing-unit) * 6);
  opacity: 0;
  animation: fadeInUp 0.6s ease-out forwards;
}

.ta-footer__column:nth-child(1) {
  animation-delay: 0.1s;
}
.ta-footer__column:nth-child(2) {
  animation-delay: 0.2s;
}
.ta-footer__column:nth-child(3) {
  animation-delay: 0.3s;
}
.ta-footer__column:nth-child(4) {
  animation-delay: 0.4s;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Services Column - Accent Border */
.ta-footer__column--services {
  position: relative;
}

@media (min-width: 1024px) {
  .ta-footer__column--services::after {
    content: "";
    position: absolute;
    right: calc(var(--footer-spacing-unit) * -8);
    top: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(
      180deg,
      transparent 0%,
      var(--footer-border-accent) 20%,
      var(--footer-border-accent) 80%,
      transparent 100%
    );
  }
}

/* ============================================
   Section Headings - Refined Typography
   ============================================ */

.ta-footer__heading {
  font-size: var(--footer-text-base);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #ffffff;
  margin: 0 0 calc(var(--footer-spacing-unit) * 5) 0;
  display: inline-block;
}

/* ============================================
   Contact Information - Clean & Scannable
   ============================================ */

.ta-footer__content {
  display: flex;
  flex-direction: column;
  gap: calc(var(--footer-spacing-unit) * 4);
  font-size: var(--footer-text-sm);
  line-height: 1.6;
}

.ta-footer__company-name {
  font-size: var(--footer-text-base);
  font-weight: 700;
  color: var(--footer-text-primary);
  margin: 0 0 calc(var(--footer-spacing-unit) * 2) 0;
  line-height: 1.4;
}

.ta-footer__info {
  margin: 0;
  color: var(--footer-text-secondary);
}

.ta-footer__label {
  font-size: var(--footer-text-xs);
  font-weight: 500;
  color: var(--footer-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: inline-block;
  margin-right: calc(var(--footer-spacing-unit) * 1);
}

.ta-footer__link {
  color: inherit;
  text-decoration: none;
  position: relative;
  transition: color var(--footer-transition-fast);
  display: inline-block;
}

.ta-footer__link::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--footer-accent-cyan);
  transition: width var(--footer-transition-base);
}

.ta-footer__link:hover {
  color: var(--footer-accent-cyan);
}

.ta-footer__link:hover::after {
  width: 100%;
}

/* ============================================
   Navigation Menus - Minimal Elegance
   ============================================ */

.ta-footer__menu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: calc(var(--footer-spacing-unit) * 3);
}

.ta-footer__menu li {
  display: flex;
  align-items: center;
  margin: 0;
  position: relative;
}

.ta-footer__menu li::before {
  content: "";
  width: 4px;
  height: 4px;
  background: var(--footer-accent-cyan);
  border-radius: 50%;
  flex-shrink: 0;
  margin-right: calc(var(--footer-spacing-unit) * 3);
  margin-top: calc(var(--footer-spacing-unit) * 1.5);
  opacity: 0.5;
  transition: all var(--footer-transition-fast);
}

.ta-footer__menu li:hover::before {
  opacity: 1;
  transform: scale(1.5);
  box-shadow: 0 0 8px var(--footer-accent-cyan);
}

.ta-footer__menu a {
  color: var(--footer-text-secondary);
  text-decoration: none;
  font-size: var(--footer-text-sm);
  line-height: 1.6;
  transition: all var(--footer-transition-fast);
  position: relative;
}

.ta-footer__menu a:hover {
  color: var(--footer-text-primary);
  transform: translateX(3px);
}

/* DMCA Badge */
.ta-footer__dmca {
  margin-top: calc(var(--footer-spacing-unit) * 6);
}

.ta-footer__dmca-link {
  display: inline-block;
  opacity: 0.7;
  transition: opacity var(--footer-transition-base);
  border-radius: var(--footer-radius-sm);
  overflow: hidden;
}

.ta-footer__dmca-link:hover {
  opacity: 1;
}

.ta-footer__dmca-image {
  height: calc(var(--footer-spacing-unit) * 10);
  display: block;
  border-radius: var(--footer-radius-sm);
}

/* ============================================
   Social Links - Modern Card Design
   ============================================ */

.ta-footer__social {
  display: flex;
  flex-direction: column;
  gap: calc(var(--footer-spacing-unit) * 3);
}

.ta-footer__social-item {
  display: block;
  text-decoration: none;
  color: inherit;
}

.ta-footer__social-card {
  display: flex;
  align-items: center;
  padding: calc(var(--footer-spacing-unit) * 3);
  background: linear-gradient(
    135deg,
    rgba(15, 31, 58, 0.6) 0%,
    rgba(10, 22, 40, 0.4) 100%
  );
  border: 1px solid var(--footer-border-accent);
  border-radius: var(--footer-radius-md);
  transition: all var(--footer-transition-base);
  position: relative;
  overflow: hidden;
}

/* Glassmorphism Effect */
.ta-footer__social-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.05),
    transparent
  );
  transition: left var(--footer-transition-slow);
}

.ta-footer__social-item:hover .ta-footer__social-card {
  background: linear-gradient(
    135deg,
    rgba(20, 40, 75, 0.7) 0%,
    rgba(15, 25, 50, 0.5) 100%
  );
  border-color: var(--footer-accent-cyan);
  transform: translateY(-2px);
  box-shadow: var(--footer-shadow-glow);
}

.ta-footer__social-item:hover .ta-footer__social-card::before {
  left: 100%;
}

/* Social Icons */
.ta-footer__social-icon {
  width: calc(var(--footer-spacing-unit) * 11);
  height: calc(var(--footer-spacing-unit) * 11);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border-radius: var(--footer-radius-sm);
  font-size: var(--footer-text-lg);
  transition: transform var(--footer-transition-base);
  color: #ffffff;
}

.ta-footer__social-item:hover .ta-footer__social-icon {
  transform: scale(1.1);
  color: #ffffff;
}

.ta-footer__social-icon svg {
  width: 1.5rem;
  height: 1.5rem;
  fill: currentColor;
}

.ta-footer__social-icon--facebook,
.ta-footer__social-icon--zalo,
.ta-footer__social-icon--map {
  border-radius: 50%;
  overflow: hidden;
  padding: calc(var(--footer-spacing-unit) * 0.5);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.ta-footer__social-icon--facebook {
  background: #1877f2;
}
.ta-footer__social-icon--zalo {
  background: #0168ff;
}

.ta-footer__social-icon--map {
  background-color: #ffffff;
}

.ta-footer__social-logo {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* Social Text */
.ta-footer__social-text {
  margin-left: calc(var(--footer-spacing-unit) * 3);
  display: flex;
  flex-direction: column;
  gap: calc(var(--footer-spacing-unit) * 0.5);
}

.ta-footer__social-name {
  font-weight: 600;
  font-size: var(--footer-text-sm);
  color: var(--footer-text-primary);
  transition: color var(--footer-transition-fast);
}

.ta-footer__social-item:hover .ta-footer__social-name {
  color: var(--footer-accent-cyan);
}

.ta-footer__social-label {
  font-size: var(--footer-text-xs);
  color: var(--footer-text-muted);
}

/* ============================================
   Copyright Bar - Refined Bottom
   ============================================ */

.ta-footer__copyright {
  position: relative;
  margin-top: calc(var(--footer-spacing-unit) * 16);
  border-top: 1px solid var(--footer-border-subtle);
}

/* Gradient Fade Top Border */
.ta-footer__copyright::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--footer-accent-cyan) 50%,
    transparent 100%
  );
  opacity: 0.3;
}

.ta-footer__copyright .ta-footer__container {
  padding-top: calc(var(--footer-spacing-unit) * 4);
  padding-bottom: calc(var(--footer-spacing-unit) * 4);
}

.ta-footer__copyright-text {
  text-align: center;
  font-size: var(--footer-text-xs);
  color: var(--footer-text-muted);
  margin: 0;
  line-height: 1.8;
}

@media (min-width: 640px) {
  .ta-footer__copyright-text {
    font-size: var(--footer-text-sm);
  }
}

.ta-footer__copyright-company {
  font-weight: 700;
  color: var(--footer-text-primary);
  transition: color var(--footer-transition-fast);
}

.ta-footer__copyright-text:hover .ta-footer__copyright-company {
  color: var(--footer-accent-cyan);
}

/* ============================================
   Responsive Refinements
   ============================================ */

@media (max-width: 767px) {
  .ta-footer__main {
    padding: calc(var(--footer-spacing-unit) * 12) 0 0 0;
  }

  .ta-footer__grid {
    gap: calc(var(--footer-spacing-unit) * 10);
  }

  .ta-footer__social-card {
    padding: calc(var(--footer-spacing-unit) * 2.5);
  }

  .ta-footer__social-icon {
    width: calc(var(--footer-spacing-unit) * 10);
    height: calc(var(--footer-spacing-unit) * 10);
  }
}

/* ============================================
   Accessibility Enhancements
   ============================================ */

@media (prefers-reduced-motion: reduce) {
  .ta-footer__column {
    animation: none;
    opacity: 1;
  }

  .ta-footer__link::after,
  .ta-footer__map-link::before,
  .ta-footer__social-card::before {
    transition: none;
  }
}

/* Focus States for Keyboard Navigation */
.ta-footer a:focus-visible {
  outline: 2px solid var(--footer-accent-cyan);
  outline-offset: 4px;
  border-radius: 2px;
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
  .ta-footer {
    background: white;
    color: black;
    border-top: 2px solid black;
  }

  .ta-footer::before,
  .ta-footer__social-card::before,
  .ta-footer__copyright::before {
    display: none;
  }

  .ta-footer__social-card {
    border: 1px solid #ccc;
  }
}