/* 랜딩 페이지 - 다크 테마 */
.landing-page {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #0a0a0b;
  min-height: 100vh;
  color: #e5e7eb;
}

.landing-page * {
  box-sizing: border-box;
}

/* 네비게이션 */
.landing-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(10, 10, 11, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #27272a;
}

.landing-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: #ffffff;
  text-decoration: none;
  letter-spacing: -0.02em;
}

.landing-logo span {
  color: #f43f5e;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-signin {
  padding: 10px 20px;
  color: #a1a1aa;
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s ease;
}

.nav-signin:hover {
  color: #ffffff;
}

.nav-cta {
  padding: 10px 20px;
  background: #ffffff;
  color: #0a0a0b;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 8px;
  transition: all 0.2s ease;
}

.nav-cta:hover {
  background: #e5e7eb;
}

/* 히어로 섹션 */
.hero-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  padding: 140px 40px 80px;
  max-width: 1200px;
  margin: 0 auto;
}

.hero-content {
  max-width: 540px;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 800;
  color: #ffffff;
  line-height: 1.15;
  margin-bottom: 24px;
  letter-spacing: -0.03em;
}

.hero-title .highlight {
  color: #f43f5e;
}

.hero-description {
  font-size: 1.125rem;
  color: #a1a1aa;
  line-height: 1.7;
  margin-bottom: 32px;
}

/* CTA 버튼 */
.cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.cta-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 28px;
  background: linear-gradient(135deg, #f43f5e 0%, #ec4899 100%);
  color: #ffffff;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 50px;
  text-decoration: none;
  transition: all 0.3s ease;
  box-shadow: 0 4px 20px rgba(244, 63, 94, 0.35);
}

.cta-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(244, 63, 94, 0.45);
}

.cta-primary i {
  font-size: 0.85rem;
}

.cta-large {
  padding: 18px 36px;
  font-size: 1.1rem;
}

.cta-note {
  color: #71717a;
  font-size: 0.875rem;
}

/* 소셜 프루프 */
.social-proof {
  display: flex;
  align-items: center;
  gap: 14px;
}

.avatar-stack {
  display: flex;
  align-items: center;
}

.avatar-item {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 2px solid #0a0a0b;
  margin-left: -10px;
  overflow: hidden;
  background: linear-gradient(135deg, #3f3f46 0%, #52525b 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #a1a1aa;
  font-size: 0.75rem;
  font-weight: 600;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.avatar-item:first-child {
  margin-left: 0;
}

.avatar-item.count {
  background: linear-gradient(135deg, #f43f5e 0%, #ec4899 100%);
  color: #ffffff;
}

.social-text {
  color: #a1a1aa;
  font-size: 0.9rem;
}

.social-text strong {
  color: #ffffff;
  font-weight: 600;
}

/* Invitation Request Form */
.invite-request-form {
  margin: 32px 0;
  max-width: 480px;
}

.invite-form-group {
  display: flex;
  gap: 12px;
}

.invite-email-input {
  flex: 1;
  padding: 14px 18px;
  background: #18181b;
  border: 1px solid #3f3f46;
  border-radius: 10px;
  color: #ffffff;
  font-size: 1rem;
  transition: all 0.2s ease;
}

.invite-email-input::placeholder {
  color: #71717a;
}

.invite-email-input:focus {
  outline: none;
  border-color: #f43f5e;
  box-shadow: 0 0 0 3px rgba(244, 63, 94, 0.1);
}

.invite-submit-btn {
  padding: 14px 24px;
  background: linear-gradient(135deg, #f43f5e 0%, #ec4899 100%);
  color: #ffffff;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.invite-submit-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(244, 63, 94, 0.4);
}

.invite-form-note {
  margin-top: 12px;
  color: #71717a;
  font-size: 0.85rem;
}

.invite-form-error {
  margin-top: 12px;
  color: #f43f5e;
  font-size: 0.85rem;
}

/* Invitation Success Message */
.invitation-success-message {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 24px;
  background: linear-gradient(135deg, rgba(34, 197, 94, 0.15) 0%, rgba(16, 185, 129, 0.15) 100%);
  border: 1px solid rgba(34, 197, 94, 0.3);
  border-radius: 12px;
  animation: fadeInUp 0.4s ease-out;
}

.invitation-success-message i {
  color: #22c55e;
  font-size: 1.25rem;
}

.invitation-success-message span {
  color: #ffffff;
  font-size: 0.95rem;
  font-weight: 500;
}

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

/* 히어로 프리뷰 */
.hero-preview {
  display: flex;
  justify-content: center;
  align-items: center;
}

.preview-wrapper {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  background: #18181b;
  border: 1px solid #27272a;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  max-width: 360px;
  width: 100%;
}

.preview-post-wrapper {
  pointer-events: none;
  user-select: none;
}

.preview-placeholder {
  width: 320px;
  height: 500px;
  background: #18181b;
  border-radius: 16px;
  border: 1px solid #27272a;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #71717a;
}

.preview-placeholder i {
  font-size: 3rem;
  margin-bottom: 12px;
}

/* How It Works 섹션 */
.how-section {
  padding: 80px 40px;
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 1.125rem;
  color: #a1a1aa;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.step-card {
  text-align: center;
  padding: 32px 24px;
}

.step-number {
  width: 48px;
  height: 48px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, #f43f5e 0%, #ec4899 100%);
  color: #ffffff;
  font-size: 1.25rem;
  font-weight: 700;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 12px;
}

.step-desc {
  font-size: 1rem;
  color: #a1a1aa;
  line-height: 1.6;
}

/* Features 섹션 */
.features-section {
  padding: 80px 40px;
  max-width: 1200px;
  margin: 0 auto;
  background: #18181b;
  border-radius: 24px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.feature-card {
  background: #0a0a0b;
  border: 1px solid #27272a;
  border-radius: 16px;
  padding: 32px;
  transition: all 0.3s ease;
}

.feature-card:hover {
  border-color: #f43f5e;
  box-shadow: 0 8px 30px rgba(244, 63, 94, 0.15);
  transform: translateY(-4px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(244, 63, 94, 0.2) 0%, rgba(236, 72, 153, 0.2) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: #f43f5e;
  font-size: 1.25rem;
}

.feature-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 10px;
}

.feature-desc {
  font-size: 0.95rem;
  color: #a1a1aa;
  line-height: 1.6;
}

/* Testimonial 섹션 */
.testimonial-section {
  padding: 80px 40px;
  max-width: 800px;
  margin: 0 auto;
}

.testimonial-card {
  text-align: center;
  padding: 48px;
  background: #18181b;
  border: 1px solid #27272a;
  border-radius: 24px;
}

.testimonial-quote {
  color: #f43f5e;
  font-size: 2rem;
  margin-bottom: 24px;
  opacity: 0.5;
}

.testimonial-text {
  font-size: 1.25rem;
  color: #e5e7eb;
  line-height: 1.7;
  margin-bottom: 32px;
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
}

.author-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, #f43f5e 0%, #ec4899 100%);
  color: #ffffff;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
}

.author-info {
  text-align: left;
}

.author-name {
  display: block;
  font-weight: 600;
  color: #ffffff;
}

.author-title {
  display: block;
  font-size: 0.875rem;
  color: #a1a1aa;
}

/* Final CTA 섹션 */
.final-cta-section {
  padding: 100px 40px;
  text-align: center;
  background: linear-gradient(180deg, #0a0a0b 0%, #18181b 100%);
}

.final-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.final-subtitle {
  font-size: 1.125rem;
  color: #a1a1aa;
  margin-bottom: 32px;
}

/* Invite Notice */
.invite-notice {
  margin-top: 24px;
  margin-bottom: 26px;
  padding: 16px 24px;
  background: rgba(244, 63, 94, 0.1);
  border: 1px solid rgba(244, 63, 94, 0.3);
  border-radius: 12px;
  text-align: center;
}

.invite-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: linear-gradient(135deg, #f43f5e, #ec4899);
  border-radius: 20px;
  color: #ffffff;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.invite-badge i {
  font-size: 0.75rem;
}

.invite-text {
  font-size: 0.9rem;
  color: #a1a1aa;
  line-height: 1.5;
  margin: 0;
}

/* App Store Section */
.app-store-section {
  margin-top: 48px;
  padding-top: 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.app-store-label {
  font-size: 0.875rem;
  color: #71717a;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 20px;
}

.app-store-badges {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.store-badge {
  position: relative;
  opacity: 0.6;
  transition: opacity 0.2s;
}

.store-badge:hover {
  opacity: 0.8;
}

.store-badge img {
  height: 44px;
  width: auto;
  filter: grayscale(30%);
}

.store-badge img[alt*="Google Play"] {
  height: 64px;
  margin: -10px 0;
}

.coming-soon-badge {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(0, 0, 0, 0.85);
  color: #f43f5e;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 4px;
  white-space: nowrap;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Footer - Dark Style */
.landing-footer {
  background: #18181b;
  padding: 60px 40px 40px;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid #27272a;
}

.footer-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: #ffffff;
  text-decoration: none;
}

.footer-logo span {
  color: #f43f5e;
}

.footer-youtube {
  display: flex;
  align-items: center;
  gap: 16px;
}

.footer-avatars {
  display: flex;
}

.footer-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #374151 0%, #4b5563 100%);
  border: 2px solid #18181b;
  margin-left: -12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #9ca3af;
  font-size: 0.75rem;
  font-weight: 600;
}

.footer-avatar:first-child {
  margin-left: 0;
}

.footer-youtube-text {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.youtube-label {
  font-size: 0.8rem;
  color: #71717a;
}

.youtube-handle {
  color: #ffffff;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 6px;
}

.youtube-handle:hover {
  color: #f43f5e;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 2fr;
  gap: 60px;
  margin-bottom: 48px;
}

.footer-column {
  min-width: 0;
}

.footer-heading {
  color: #ffffff;
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.footer-social {
  display: flex;
  gap: 16px;
}

.social-link {
  color: #71717a;
  font-size: 1.25rem;
  transition: color 0.2s ease;
}

.social-link:hover {
  color: #ffffff;
}

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

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  color: #a1a1aa;
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-articles {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-articles li {
  margin-bottom: 16px;
}

.footer-articles a {
  color: #a1a1aa;
  text-decoration: none;
  font-size: 0.9rem;
  line-height: 1.5;
  transition: color 0.2s ease;
}

.footer-articles a:hover {
  color: #ffffff;
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid #27272a;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-copyright {
  color: #52525b;
  font-size: 0.8rem;
}

/* Language Selector */
.footer-language {
  display: flex;
  align-items: center;
}

.language-selector-landing {
  position: relative;
}

.language-select {
  background: #18181b;
  border: 1px solid #3f3f46;
  color: #a1a1aa;
  padding: 8px 32px 8px 12px;
  border-radius: 8px;
  font-size: 0.85rem;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%23a1a1aa'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
  background-size: 16px;
  transition: all 0.2s ease;
}

.language-select:hover {
  border-color: #52525b;
  color: #e5e7eb;
}

.language-select:focus {
  outline: none;
  border-color: #f43f5e;
}

.language-select option {
  background: #18181b;
  color: #e5e7eb;
  padding: 8px;
}

/* Legal Pages (Terms, Privacy) */
.legal-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 120px 40px 80px;
}

.legal-content h1 {
  font-size: 2.5rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.legal-date {
  color: #71717a;
  font-size: 0.9rem;
  margin-bottom: 48px;
}

.legal-content section {
  margin-bottom: 32px;
}

.legal-content h2 {
  font-size: 1.25rem;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 12px;
}

.legal-content h3 {
  font-size: 1rem;
  font-weight: 600;
  color: #e5e7eb;
  margin: 16px 0 8px;
}

.legal-content p {
  color: #a1a1aa;
  line-height: 1.7;
  margin-bottom: 12px;
}

.legal-content ul {
  color: #a1a1aa;
  line-height: 1.7;
  margin: 12px 0;
  padding-left: 24px;
}

.legal-content li {
  margin-bottom: 8px;
}

.legal-content a {
  color: #f43f5e;
  text-decoration: none;
}

.legal-content a:hover {
  text-decoration: underline;
}

@media (max-width: 640px) {
  .legal-content {
    padding: 100px 20px 60px;
  }

  .legal-content h1 {
    font-size: 1.75rem;
  }
}

/* Screenshots Slider */
.screenshots-disclaimer {
  text-align: center;
  color: #f43f5e;
  font-size: 1rem;
  font-weight: 500;
  margin: 40px 0 0;
}

.screenshots-section {
  padding: 60px 0 80px;
  max-width: 1200px;
  margin: 0 auto;
  overflow: hidden;
}

.screenshots-container {
  overflow: hidden;
  width: 100%;
  padding: 0 40px;
}

.screenshots-track {
  display: flex;
  gap: 24px;
  transition: transform 0.5s ease;
}

.screenshot-card {
  flex-shrink: 0;
  width: auto;
  height: 500px;
  background: #18181b;
  border-radius: 16px;
  border: 1px solid #27272a;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
}

.screenshot-card img {
  height: 100%;
  width: auto;
  display: block;
  object-fit: contain;
  border: 1px solid #8b5cf6;
  border-radius: 16px;
}

.screenshots-nav {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 32px;
  position: relative;
  z-index: 10;
}

.screenshots-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: #27272a;
  border: 1px solid #3f3f46;
  color: #e5e7eb;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.screenshots-btn:hover {
  background: #3f3f46;
  color: #ffffff;
}

.screenshots-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

/* 반응형 */
@media (max-width: 968px) {
  .hero-section {
    grid-template-columns: 1fr;
    gap: 48px;
    padding: 120px 24px 60px;
    text-align: center;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero-preview {
    order: -1;
  }

  .cta-group {
    justify-content: center;
  }

  .social-proof {
    justify-content: center;
  }

  .steps-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .screenshot-card {
    height: 400px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }

  .footer-column-wide {
    grid-column: span 2;
  }
}

@media (max-width: 640px) {
  .landing-nav {
    padding: 12px 20px;
  }

  .nav-cta {
    display: none;
  }

  .hero-section {
    padding: 100px 20px 40px;
  }

  .how-section,
  .features-section,
  .testimonial-section {
    padding: 60px 20px;
  }

  .final-cta-section {
    padding: 80px 20px;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .cta-group {
    flex-direction: column;
    align-items: center;
  }

  .invite-form-group {
    flex-direction: column;
  }

  .invite-email-input {
    width: 100%;
  }

  .invite-submit-btn {
    width: 100%;
  }

  .social-proof {
    flex-direction: column;
    gap: 12px;
  }

  .landing-footer {
    padding: 40px 20px 32px;
  }

  .footer-top {
    flex-direction: column;
    gap: 32px;
    align-items: flex-start;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-column-wide {
    grid-column: span 1;
  }

  .screenshots-container {
    padding: 0 20px;
  }

  .screenshots-track {
    gap: 16px;
  }

  .screenshot-card {
    height: 320px;
  }

  .screenshots-btn {
    width: 40px;
    height: 40px;
  }
}