@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Noto+Sans+SC:wght@300;400;500;700&family=Noto+Sans+JP:wght@300;400;500;700&family=Noto+Sans+KR:wght@300;400;500;700&display=swap');

:root {
  --color-primary: #161414;
  --color-secondary: #191616;
  --color-accent: #d9877d;
  --color-accent2: #6aa7b4;
  --color-accent3: #77818c;
  --color-bg: #0e0c0c;
  --color-surface: #1e1b1b;
  --color-surface-hover: #2a2626;
  --color-text: #f0eaea;
  --color-text-secondary: #a8a0a0;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-light: rgba(255, 255, 255, 0.12);
  --gradient-accent: linear-gradient(135deg, #d9877d 0%, #6aa7b4 100%);
  --gradient-hero: linear-gradient(180deg, #161414 0%, #0e0c0c 100%);
  --gradient-cta: linear-gradient(135deg, #d9877d 0%, #c47068 100%);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --font-main: 'Inter', 'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR', sans-serif;
  --transition: 0.3s ease;
}

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-main);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

ul {
  list-style: none;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==================== HEADER ==================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 16px 0;
  transition: background var(--transition), box-shadow var(--transition), padding var(--transition);
}

.header.scrolled {
  background: rgba(22, 20, 20, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
  padding: 10px 0;
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-text);
}

.logo img {
  width: 32px;
  height: 32px;
  border-radius: 6px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--color-accent);
}

.nav-links a i {
  font-size: 0.85rem;
}

/* Language Switcher */
.lang-switcher {
  position: relative;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: 1px solid var(--color-border-light);
  color: var(--color-text-secondary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.85rem;
  font-family: var(--font-main);
  transition: all var(--transition);
}

.lang-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-text);
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 8px 0;
  min-width: 160px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition);
  box-shadow: var(--shadow-lg);
  z-index: 100;
}

.lang-dropdown.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-dropdown a {
  display: block;
  padding: 8px 16px;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  transition: all var(--transition);
}

.lang-dropdown a:hover,
.lang-dropdown a.current {
  background: var(--color-surface-hover);
  color: var(--color-accent);
}

.btn-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--gradient-cta);
  color: #fff;
  padding: 10px 24px;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: 0 4px 15px rgba(217, 135, 125, 0.3);
}

.btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(217, 135, 125, 0.4);
}

.btn-cta-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--color-accent);
  padding: 10px 24px;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 600;
  border: 2px solid var(--color-accent);
  cursor: pointer;
  transition: all var(--transition);
}

.btn-cta-outline:hover {
  background: var(--color-accent);
  color: #fff;
  transform: translateY(-2px);
}

/* Mobile Menu */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px;
}

/* ==================== HERO ==================== */
.hero {
  padding: 140px 0 80px;
  background: var(--gradient-hero);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at center, rgba(217, 135, 125, 0.06) 0%, transparent 60%);
  pointer-events: none;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  position: relative;
}

.hero h1 .highlight {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .subtitle {
  font-size: 1.2rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero .btn-cta {
  padding: 14px 36px;
  font-size: 1rem;
}

/* ==================== SECTIONS COMMON ==================== */
.section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 50px;
}

.section-title h2 {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.section-title p {
  color: var(--color-text-secondary);
  font-size: 1.05rem;
  max-width: 560px;
  margin: 0 auto;
}

/* ==================== FEATURES ==================== */
.features {
  background: var(--color-secondary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all var(--transition);
}

.feature-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  width: 52px;
  height: 52px;
  background: rgba(217, 135, 125, 0.12);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.feature-icon i {
  font-size: 1.3rem;
  color: var(--color-accent);
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.feature-card p {
  color: var(--color-text-secondary);
  font-size: 0.92rem;
  line-height: 1.6;
}

.features-cta {
  text-align: center;
  margin-top: 40px;
}

/* ==================== USE CASES ==================== */
.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.use-case-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  transition: all var(--transition);
}

.use-case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.use-case-card:nth-child(1) .use-case-icon { background: rgba(217, 135, 125, 0.12); }
.use-case-card:nth-child(1) .use-case-icon i { color: var(--color-accent); }
.use-case-card:nth-child(2) .use-case-icon { background: rgba(106, 167, 180, 0.12); }
.use-case-card:nth-child(2) .use-case-icon i { color: var(--color-accent2); }
.use-case-card:nth-child(3) .use-case-icon { background: rgba(119, 129, 140, 0.12); }
.use-case-card:nth-child(3) .use-case-icon i { color: var(--color-accent3); }
.use-case-card:nth-child(4) .use-case-icon { background: rgba(217, 135, 125, 0.12); }
.use-case-card:nth-child(4) .use-case-icon i { color: var(--color-accent); }

.use-case-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 18px;
}

.use-case-icon i {
  font-size: 1.4rem;
}

.use-case-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.use-case-card p {
  color: var(--color-text-secondary);
  font-size: 0.88rem;
  line-height: 1.6;
}

/* ==================== PRICING ==================== */
.pricing {
  background: var(--color-secondary);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: start;
}

.pricing-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 36px 28px;
  text-align: center;
  transition: all var(--transition);
  position: relative;
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.pricing-card.popular {
  border-color: var(--color-accent);
  box-shadow: 0 0 40px rgba(217, 135, 125, 0.15);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-cta);
  color: #fff;
  padding: 4px 20px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
}

.pricing-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 8px;
  margin-top: 8px;
}

.pricing-price {
  font-size: 2.8rem;
  font-weight: 800;
  margin: 16px 0;
}

.pricing-price span {
  font-size: 1rem;
  font-weight: 400;
  color: var(--color-text-secondary);
}

.pricing-features {
  text-align: left;
  margin: 24px 0;
}

.pricing-features li {
  padding: 8px 0;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.pricing-features li i.fa-check {
  color: var(--color-accent);
}

.pricing-features li i.fa-xmark {
  color: #555;
}

.pricing-card .btn-cta {
  width: 100%;
  justify-content: center;
  margin-top: 8px;
}

.pricing-card .btn-cta-outline {
  width: 100%;
  justify-content: center;
  margin-top: 8px;
}

/* ==================== TESTIMONIALS ==================== */
.testimonials-header {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.testimonial-stat {
  text-align: center;
}

.testimonial-stat .number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-accent);
}

.testimonial-stat .label {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-top: 4px;
}

.stars {
  color: #f5a623;
  font-size: 1rem;
  margin-bottom: 4px;
}

.testimonials-carousel {
  position: relative;
  overflow: hidden;
}

.testimonials-track {
  display: flex;
  transition: transform 0.5s ease;
}

.testimonial-card {
  flex: 0 0 calc(33.333% - 16px);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin: 0 8px;
}

.testimonial-card .stars {
  margin-bottom: 14px;
}

.testimonial-card blockquote {
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 18px;
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.testimonial-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  color: #fff;
}

.testimonial-author-info .name {
  font-weight: 600;
  font-size: 0.9rem;
}

.testimonial-author-info .role {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.testimonial-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 32px;
}

.testimonial-tag {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.82rem;
  color: var(--color-text-secondary);
}

/* ==================== COMPARISON ==================== */
.comparison {
  background: var(--color-secondary);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.comparison-table thead th {
  padding: 18px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  text-align: center;
  background: rgba(217, 135, 125, 0.06);
  border-bottom: 1px solid var(--color-border);
}

.comparison-table thead th:first-child {
  text-align: left;
}

.comparison-table thead th.highlight-col {
  color: var(--color-accent);
  background: rgba(217, 135, 125, 0.12);
}

.comparison-table tbody td {
  padding: 16px 20px;
  font-size: 0.9rem;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

.comparison-table tbody td:first-child {
  text-align: left;
  font-weight: 500;
  color: var(--color-text);
}

.comparison-table tbody td.highlight-col {
  background: rgba(217, 135, 125, 0.04);
}

.comparison-table tbody td i.fa-check {
  color: var(--color-accent);
  font-size: 1.1rem;
}

.comparison-table tbody td i.fa-xmark {
  color: #555;
  font-size: 1.1rem;
}

.comparison-table tbody tr:last-child td {
  border-bottom: none;
}

/* ==================== FAQ ==================== */
.faq-list {
  max-width: 780px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color var(--transition);
}

.faq-item.active {
  border-color: var(--color-accent);
}

.faq-question {
  width: 100%;
  background: var(--color-surface);
  border: none;
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-family: var(--font-main);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  transition: background var(--transition);
  text-align: left;
}

.faq-question:hover {
  background: var(--color-surface-hover);
}

.faq-question i {
  font-size: 0.85rem;
  color: var(--color-accent);
  transition: transform var(--transition);
}

.faq-item.active .faq-question i {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.faq-answer-inner {
  padding: 0 24px 20px;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ==================== FINAL CTA ==================== */
.final-cta {
  padding: 80px 0;
  background: linear-gradient(135deg, rgba(217, 135, 125, 0.15) 0%, rgba(106, 167, 180, 0.1) 100%);
  text-align: center;
  position: relative;
}

.final-cta h2 {
  font-size: 2.4rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.final-cta p {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
}

.final-cta .btn-cta {
  padding: 16px 48px;
  font-size: 1.1rem;
}

/* ==================== FOOTER ==================== */
.footer {
  padding: 48px 0 24px;
  background: var(--color-primary);
  border-top: 1px solid var(--color-border);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: start;
  margin-bottom: 32px;
  flex-wrap: wrap;
  gap: 32px;
}

.footer-brand {
  max-width: 300px;
}

.footer-brand .logo {
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.footer-links-group {
  display: flex;
  gap: 64px;
}

.footer-links h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--color-text);
}

.footer-links a {
  display: block;
  padding: 4px 0;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  transition: color var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  flex-wrap: wrap;
  gap: 12px;
}

.footer-legal a {
  margin-left: 20px;
}

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

/* ==================== BACK TO TOP ==================== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  background: var(--gradient-cta);
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 1.1rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition);
  box-shadow: var(--shadow-md);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

/* ==================== ANIMATIONS ==================== */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.animated {
  opacity: 1;
  transform: translateY(0);
}

/* ==================== MOBILE NAV OVERLAY ==================== */
.mobile-nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(14, 12, 12, 0.97);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
}

.mobile-nav-overlay.active {
  display: flex;
}

.mobile-nav-overlay a {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-text);
  transition: color var(--transition);
}

.mobile-nav-overlay a:hover {
  color: var(--color-accent);
}

.mobile-nav-close {
  position: absolute;
  top: 20px;
  right: 24px;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 2rem;
  cursor: pointer;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .use-cases-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .testimonial-card {
    flex: 0 0 calc(50% - 16px);
  }
}

@media (max-width: 768px) {
  .nav-links,
  .header .btn-cta,
  .header .lang-switcher {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .hero {
    padding: 120px 0 60px;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero .subtitle {
    font-size: 1rem;
  }

  .section {
    padding: 60px 0;
  }

  .section-title h2 {
    font-size: 1.7rem;
  }

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

  .use-cases-grid {
    grid-template-columns: 1fr;
  }

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }

  .testimonial-card {
    flex: 0 0 calc(100% - 16px);
  }

  .comparison-table {
    font-size: 0.82rem;
  }

  .comparison-table thead th,
  .comparison-table tbody td {
    padding: 12px 10px;
  }

  .final-cta h2 {
    font-size: 1.8rem;
  }

  .footer-content {
    flex-direction: column;
  }

  .footer-links-group {
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .footer-legal a {
    margin-left: 0;
    margin-right: 16px;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.7rem;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .pricing-price {
    font-size: 2.2rem;
  }

  .testimonials-header {
    gap: 24px;
  }

  .footer-links-group {
    flex-direction: column;
    gap: 24px;
  }
}