/**
 * LinguaPods - Main Styles
 * AI Translation Earbuds B2B Website
 */

/* ====== Base Styles ====== */

html {
  scroll-behavior: smooth;
}

body {
  overflow-x: hidden;
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: var(--leading-relaxed);
}

/* ====== Navigation ====== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  height: var(--nav-height);
  background: var(--bg-glass);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--color-border-light);
  transition: all var(--duration-normal) var(--ease-out);
}

.nav.scrolled {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-md);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text-primary);
  font-weight: var(--font-bold);
  font-size: var(--text-xl);
}

.logo-icon {
  width: 40px;
  height: 40px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: var(--font-medium);
  font-size: var(--text-sm);
  transition: color var(--duration-fast) var(--ease-in-out);
  position: relative;
}

.nav-links a:not(.nav-cta):hover {
  color: var(--color-primary);
}

.nav-links a:not(.nav-cta)::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--duration-normal) var(--ease-out);
}

.nav-links a:not(.nav-cta):hover::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text-primary);
  transition: all var(--duration-fast) var(--ease-in-out);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }
  
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg-primary);
    flex-direction: column;
    justify-content: flex-start;
    padding: var(--space-8);
    gap: var(--space-6);
    transform: translateX(100%);
    transition: transform var(--duration-normal) var(--ease-out);
  }
  
  .nav-links.active {
    transform: translateX(0);
  }
  
  .nav-links a {
    font-size: var(--text-lg);
  }
}

/* ====== Buttons ====== */

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-lg);
  font-weight: var(--font-semibold);
  font-size: var(--text-sm);
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all var(--duration-fast) var(--ease-in-out);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-primary-lg);
}

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

.btn-secondary {
  background: var(--glass-bg);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
}

.btn-secondary:hover {
  background: var(--color-bg-secondary);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-large {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
}

.btn-full {
  width: 100%;
}

/* ====== Hero Section ====== */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-height) + var(--space-16)) 0 var(--space-16);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero-gradient {
  position: absolute;
  inset: 0;
  background: var(--gradient-bg-hero);
}

.hero-mesh {
  position: absolute;
  inset: 0;
  background: var(--gradient-bg-mesh);
  opacity: 0.5;
}

.hero-particles {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: var(--color-primary);
  border-radius: 50%;
  opacity: 0.3;
  animation: floatParticle 20s infinite;
}

@keyframes floatParticle {
  0%, 100% { transform: translateY(0) translateX(0); opacity: 0; }
  10% { opacity: 0.3; }
  90% { opacity: 0.3; }
  100% { transform: translateY(-100vh) translateX(100px); opacity: 0; }
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-visual {
    order: -1;
  }
}

.hero-content {
  max-width: 640px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--glass-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}

.badge-dot {
  width: 8px;
  height: 8px;
  background: var(--color-success);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

.hero-title {
  font-size: clamp(var(--text-4xl), 5vw, var(--text-6xl));
  font-weight: var(--font-extrabold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-6);
}

.hero-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-8);
  max-width: 540px;
}

@media (max-width: 1024px) {
  .hero-subtitle {
    max-width: none;
  }
}

.highlight {
  color: var(--color-primary);
  font-weight: var(--font-semibold);
}

.hero-stats {
  display: flex;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

@media (max-width: 768px) {
  .hero-stats {
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--space-4);
  }
}

.stat {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: var(--text-3xl);
  font-weight: var(--font-extrabold);
  color: var(--color-primary);
  line-height: 1;
}

.stat-label {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  margin-top: var(--space-2);
}

.hero-cta {
  display: flex;
  gap: var(--space-4);
  margin-bottom: var(--space-10);
}

@media (max-width: 768px) {
  .hero-cta {
    flex-direction: column;
    align-items: center;
  }
}

.hero-trust {
  p {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-4);
  }
}

.logo-wall {
  display: flex;
  gap: var(--space-6);
  flex-wrap: wrap;
}

.logo-item {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-2);
  transition: all var(--duration-fast) var(--ease-in-out);
}

.logo-item:hover {
  transform: translateY(-2px);
  background: var(--color-bg-tertiary);
}

.logo-item svg {
  width: 100%;
  height: 100%;
  color: var(--color-text-tertiary);
}

.hero-visual {
  position: relative;
}

.hero-product-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--color-primary-glow) 0%, transparent 70%);
  filter: blur(40px);
  animation: pulse 4s ease-in-out infinite;
}

.hero-product-float {
  position: relative;
  z-index: 1;
  animation: float 6s ease-in-out infinite;
}

.hero-product-img {
  width: 100%;
  max-width: 500px;
  height: auto;
  filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.15));
}

/* ====== Section Headers ====== */

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--space-16);
}

.section-label {
  display: inline-block;
  padding: var(--space-2) var(--space-4);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  margin-bottom: var(--space-4);
}

.section-header h2 {
  font-size: clamp(var(--text-3xl), 4vw, var(--text-5xl));
  font-weight: var(--font-extrabold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-4);
}

.section-header p {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

/* ====== Features Section ====== */

.features {
  padding: var(--space-32) 0;
  background: var(--color-bg-secondary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-8);
}

.feature-card {
  padding: var(--space-8);
  text-align: center;
  transition: all var(--duration-normal) var(--ease-out);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-6);
}

.feature-icon svg {
  width: 100%;
  height: 100%;
}

.feature-card h3 {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  margin-bottom: var(--space-3);
}

.feature-card p {
  color: var(--color-text-secondary);
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
}

/* ====== Technology Section ====== */

.technology {
  padding: var(--space-32) 0;
}

.tech-showcase {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

@media (max-width: 1024px) {
  .tech-showcase {
    grid-template-columns: 1fr;
  }
}

.tech-visual {
  position: relative;
  border-radius: var(--radius-2xl);
  overflow: hidden;
}

.tech-visual img {
  width: 100%;
  height: auto;
  display: block;
}

.tech-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--color-primary-glow), var(--color-accent-glow));
  opacity: 0.3;
}

.tech-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.tech-feature {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-6);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-xl);
  transition: all var(--duration-normal) var(--ease-out);
}

.tech-feature:hover {
  background: var(--color-bg-tertiary);
  transform: translateX(8px);
}

.tech-feature-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  color: white;
}

.tech-feature-icon svg {
  width: 24px;
  height: 24px;
}

.tech-feature-text h4 {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  margin-bottom: var(--space-2);
}

.tech-feature-text p {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

/* ====== Use Cases Section ====== */

.use-cases {
  padding: var(--space-32) 0;
  background: var(--color-bg-secondary);
}

.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-8);
}

.use-case-card {
  padding: var(--space-8);
  transition: all var(--duration-normal) var(--ease-out);
}

.use-case-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.use-case-icon {
  width: 56px;
  height: 56px;
  margin-bottom: var(--space-6);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-primary);
  border-radius: var(--radius-lg);
}

.use-case-icon svg {
  width: 32px;
  height: 32px;
  color: var(--color-primary);
}

.use-case-card h3 {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  margin-bottom: var(--space-3);
}

.use-case-card p {
  color: var(--color-text-secondary);
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-4);
}

.use-case-card ul {
  list-style: none;
  padding: 0;
}

.use-case-card li {
  position: relative;
  padding-left: var(--space-5);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.use-case-card li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: var(--font-bold);
}

/* ====== Testimonials Section ====== */

.testimonials {
  padding: var(--space-32) 0;
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-8);
}

.testimonial-card {
  padding: var(--space-8);
}

.testimonial-content {
  margin-bottom: var(--space-6);
}

.testimonial-content p {
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  color: var(--color-text-primary);
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.author-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  overflow: hidden;
}

.author-avatar img,
.author-avatar svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.author-info strong {
  display: block;
  font-size: var(--text-base);
  margin-bottom: var(--space-1);
}

.author-info span {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}

/* ====== CTA Section ====== */

.cta-section {
  padding: var(--space-32) 0;
  background: var(--color-bg-secondary);
}

.cta-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  padding: var(--space-12);
  align-items: center;
}

@media (max-width: 1024px) {
  .cta-card {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }
}

.cta-content h2 {
  font-size: var(--text-4xl);
  font-weight: var(--font-extrabold);
  margin-bottom: var(--space-4);
}

.cta-content p {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-8);
}

.cta-buttons {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.cta-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.cta-product-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, var(--color-primary-glow) 0%, transparent 70%);
  filter: blur(40px);
}

.cta-visual img {
  max-width: 300px;
  height: auto;
  position: relative;
  z-index: 1;
}

/* ====== Contact Section ====== */

.contact {
  padding: var(--space-32) 0;
}

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
}

@media (max-width: 1024px) {
  .contact-layout {
    grid-template-columns: 1fr;
  }
}

.contact-info h2 {
  font-size: var(--text-4xl);
  font-weight: var(--font-extrabold);
  margin-bottom: var(--space-4);
}

.contact-info > p {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-8);
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text-secondary);
}

.contact-item svg {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.contact-form {
  padding: var(--space-8);
}

.form-group {
  margin-bottom: var(--space-6);
}

.form-group label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  margin-bottom: var(--space-2);
  color: var(--color-text-primary);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: var(--text-base);
  font-family: var(--font-sans);
  transition: all var(--duration-fast) var(--ease-in-out);
  background: var(--color-bg-primary);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-glow);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* ====== Footer ====== */

.footer {
  background: var(--color-dark);
  color: var(--color-text-inverse);
  padding: var(--space-24) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-16);
}

@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

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

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text-inverse);
  text-decoration: none;
  font-weight: var(--font-bold);
  font-size: var(--text-xl);
  margin-bottom: var(--space-4);
}

.footer-brand p {
  color: var(--color-text-tertiary);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

.footer-links h4 {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  margin-bottom: var(--space-4);
  color: var(--color-text-inverse);
}

.footer-links ul {
  list-style: none;
  padding: 0;
}

.footer-links li {
  margin-bottom: var(--space-3);
}

.footer-links a {
  color: var(--color-text-tertiary);
  text-decoration: none;
  font-size: var(--text-sm);
  transition: color var(--duration-fast) var(--ease-in-out);
}

.footer-links a:hover {
  color: var(--color-text-inverse);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-dark-lighter);
}

@media (max-width: 768px) {
  .footer-bottom {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }
}

.footer-bottom p {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}

.footer-legal {
  display: flex;
  gap: var(--space-6);
}

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

.footer-legal a:hover {
  color: var(--color-text-inverse);
}

/* ====== Reveal Animation ====== */

.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ====== Utility Classes ====== */

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

.glass-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--glass-shadow);
}