/* ===== CSS Variables ===== */
:root {
  --color-primary: #2a1e28;
  --color-secondary: #2e202c;
  --color-accent: #c4c29e;
  --color-green: #87ea9b;
  --color-purple: #8a60ad;
  --color-text: #e8e6e3;
  --color-text-muted: #a8a5a0;
  --color-card-bg: rgba(46, 32, 44, 0.6);
  --color-card-border: rgba(138, 96, 173, 0.2);
  --color-overlay: rgba(42, 30, 40, 0.85);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --shadow-card: 0 4px 24px rgba(0,0,0,0.25);
  --shadow-glow: 0 0 40px rgba(138, 96, 173, 0.15);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-main: 'Inter', 'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR', sans-serif;
  --max-width: 1200px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-main);
  background: var(--color-primary);
  color: var(--color-text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

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

img {
  max-width: 100%;
  display: block;
}

ul {
  list-style: none;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Utility: Animations ===== */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Header / Navbar ===== */
.navbar {
  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);
}

.navbar.scrolled {
  background: var(--color-overlay);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 2px 20px rgba(0,0,0,0.3);
  padding: 10px 0;
}

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

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-text);
}

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

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

.nav-links a {
  color: var(--color-text-muted);
  font-size: 0.92rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: color var(--transition);
}

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

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

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

.lang-btn {
  background: none;
  border: 1px solid var(--color-card-border);
  color: var(--color-text-muted);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.88rem;
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-main);
  transition: all var(--transition);
}

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

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--color-secondary);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-sm);
  min-width: 160px;
  display: none;
  box-shadow: var(--shadow-card);
  overflow: hidden;
  z-index: 100;
}

.lang-dropdown.open {
  display: block;
}

.lang-dropdown a {
  display: block;
  padding: 10px 16px;
  color: var(--color-text-muted);
  font-size: 0.88rem;
  transition: all var(--transition);
}

.lang-dropdown a:hover,
.lang-dropdown a.active {
  background: rgba(138, 96, 173, 0.15);
  color: var(--color-green);
}

/* CTA Button */
.btn-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  background: linear-gradient(135deg, var(--color-purple), #6b3fa0);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(138, 96, 173, 0.4);
  color: #fff;
}

.btn-cta-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  background: transparent;
  color: var(--color-green);
  border: 2px solid var(--color-green);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.btn-cta-outline:hover {
  background: var(--color-green);
  color: var(--color-primary);
  transform: translateY(-2px);
}

/* Hamburger Menu */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Nav */
.mobile-nav {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: var(--color-primary);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
  opacity: 0;
  transition: opacity var(--transition);
}

.mobile-nav.open {
  display: flex;
  opacity: 1;
}

.mobile-nav a {
  color: var(--color-text);
  font-size: 1.4rem;
  font-weight: 600;
}

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

/* ===== Hero Section ===== */
.hero {
  padding: 140px 0 80px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(138,96,173,0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--color-text), var(--color-green));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero h1 span {
  color: var(--color-green);
  -webkit-text-fill-color: var(--color-green);
}

.hero p {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto 36px;
}

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

.hero .btn-cta {
  padding: 14px 36px;
  font-size: 1.05rem;
}

/* ===== Section Shared ===== */
section {
  padding: 90px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 56px;
}

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

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

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

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

.feature-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  transition: all var(--transition);
}

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

.feature-card .icon {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, rgba(138,96,173,0.2), rgba(135,234,155,0.1));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.3rem;
  color: var(--color-purple);
}

.feature-card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
  font-weight: 600;
}

.feature-card p {
  color: var(--color-text-muted);
  font-size: 0.93rem;
  line-height: 1.6;
}

.features .section-cta {
  text-align: center;
  margin-top: 48px;
}

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

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

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

.use-case-card .icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 18px;
  font-size: 1.4rem;
}

.use-case-card:nth-child(1) .icon {
  background: rgba(138, 96, 173, 0.2);
  color: var(--color-purple);
}

.use-case-card:nth-child(2) .icon {
  background: rgba(135, 234, 155, 0.2);
  color: var(--color-green);
}

.use-case-card:nth-child(3) .icon {
  background: rgba(196, 194, 158, 0.2);
  color: var(--color-accent);
}

.use-case-card:nth-child(4) .icon {
  background: rgba(138, 96, 173, 0.2);
  color: var(--color-purple);
}

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

.use-case-card p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* ===== Pricing Section ===== */
.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-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-md);
  padding: 40px 32px;
  text-align: center;
  transition: all var(--transition);
  position: relative;
}

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

.pricing-card.popular {
  border-color: var(--color-purple);
  box-shadow: var(--shadow-glow);
  transform: scale(1.03);
}

.pricing-card.popular:hover {
  transform: scale(1.03) translateY(-4px);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--color-purple), #6b3fa0);
  color: #fff;
  padding: 4px 20px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 600;
  white-space: nowrap;
}

.pricing-card h3 {
  font-size: 1.3rem;
  margin-bottom: 8px;
  font-weight: 700;
}

.pricing-card .price {
  font-size: 2.6rem;
  font-weight: 800;
  margin-bottom: 6px;
}

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

.pricing-card .price-desc {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: 28px;
}

.pricing-card ul {
  text-align: left;
  margin-bottom: 32px;
}

.pricing-card ul li {
  padding: 8px 0;
  font-size: 0.93rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 10px;
}

.pricing-card ul li i.fa-check {
  color: var(--color-green);
}

.pricing-card ul li i.fa-xmark {
  color: #666;
}

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

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

/* ===== Testimonials Section ===== */
.testimonials-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.rating-overview {
  text-align: center;
}

.rating-overview .score {
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-green);
}

.rating-overview .stars {
  color: #f5a623;
  font-size: 1.2rem;
  margin: 4px 0;
}

.rating-overview .count {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.rating-bars {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 220px;
}

.rating-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.rating-bar .bar {
  flex: 1;
  height: 8px;
  background: rgba(255,255,255,0.1);
  border-radius: 4px;
  overflow: hidden;
}

.rating-bar .bar .fill {
  height: 100%;
  background: #f5a623;
  border-radius: 4px;
}

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

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

.testimonial-card {
  flex: 0 0 100%;
  max-width: 100%;
  padding: 0 12px;
}

@media (min-width: 768px) {
  .testimonial-card {
    flex: 0 0 50%;
    max-width: 50%;
  }
}

@media (min-width: 1024px) {
  .testimonial-card {
    flex: 0 0 33.333%;
    max-width: 33.333%;
  }
}

.testimonial-card-inner {
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  height: 100%;
}

.testimonial-card-inner .stars {
  color: #f5a623;
  margin-bottom: 14px;
  font-size: 0.95rem;
}

.testimonial-card-inner blockquote {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 18px;
  font-style: italic;
}

.testimonial-card-inner .author {
  font-weight: 600;
  font-size: 0.9rem;
}

.testimonial-card-inner .role {
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.carousel-controls {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 32px;
}

.carousel-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--color-card-border);
  background: var(--color-card-bg);
  color: var(--color-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  font-size: 1rem;
}

.carousel-btn:hover {
  border-color: var(--color-purple);
  background: rgba(138,96,173,0.15);
}

.testimonial-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 36px;
}

.testimonial-tags span {
  background: rgba(138, 96, 173, 0.12);
  color: var(--color-accent);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
}

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

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

.comparison-table th,
.comparison-table td {
  padding: 16px 24px;
  text-align: center;
  font-size: 0.93rem;
}

.comparison-table thead th {
  background: rgba(138, 96, 173, 0.15);
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-text);
}

.comparison-table thead th.highlight {
  background: rgba(138, 96, 173, 0.3);
  color: var(--color-green);
}

.comparison-table tbody tr {
  border-top: 1px solid var(--color-card-border);
}

.comparison-table tbody tr:hover {
  background: rgba(138, 96, 173, 0.05);
}

.comparison-table tbody td:first-child {
  text-align: left;
  font-weight: 600;
}

.comparison-table tbody td.highlight {
  background: rgba(138, 96, 173, 0.08);
}

.comparison-table .check {
  color: var(--color-green);
  font-weight: 700;
}

.comparison-table .cross {
  color: #666;
}

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

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

.faq-item:hover {
  border-color: var(--color-purple);
}

.faq-question {
  width: 100%;
  background: var(--color-card-bg);
  border: none;
  color: var(--color-text);
  padding: 20px 24px;
  font-size: 1rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-family: var(--font-main);
  transition: background var(--transition);
}

.faq-question:hover {
  background: rgba(138, 96, 173, 0.1);
}

.faq-question i {
  transition: transform var(--transition);
  color: var(--color-purple);
  font-size: 0.9rem;
  flex-shrink: 0;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
}

.faq-item.active .faq-answer {
  max-height: 300px;
}

.faq-answer p {
  padding: 0 24px 20px;
  color: var(--color-text-muted);
  font-size: 0.93rem;
  line-height: 1.7;
}

/* ===== Final CTA Section ===== */
.final-cta {
  padding: 100px 0;
  text-align: center;
  background: linear-gradient(135deg, var(--color-secondary), var(--color-primary), rgba(138,96,173,0.15));
  position: relative;
  overflow: hidden;
}

.final-cta::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(138,96,173,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.final-cta h2 {
  font-size: 2.6rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.final-cta p {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  margin-bottom: 40px;
}

.final-cta .btn-cta {
  padding: 16px 48px;
  font-size: 1.15rem;
  border-radius: var(--radius-sm);
}

/* ===== Footer ===== */
.footer {
  background: rgba(30, 20, 28, 0.8);
  padding: 48px 0 24px;
  border-top: 1px solid var(--color-card-border);
}

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

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text);
}

.footer-brand img {
  width: 28px;
  height: 28px;
  border-radius: 6px;
}

.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  transition: color var(--transition);
}

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

.footer-bottom {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid var(--color-card-border);
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

/* ===== Back To Top ===== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-purple), #6b3fa0);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition);
  z-index: 900;
  box-shadow: 0 4px 16px rgba(138, 96, 173, 0.3);
}

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

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(138, 96, 173, 0.5);
}

/* ===== 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);
  }

  .pricing-card.popular {
    transform: none;
  }

  .pricing-card.popular:hover {
    transform: translateY(-4px);
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .hamburger {
    display: flex;
  }

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

  .hero h1 {
    font-size: 2.2rem;
  }

  .hero p {
    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;
  }

  .comparison-table th,
  .comparison-table td {
    padding: 12px 10px;
    font-size: 0.82rem;
  }

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

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

  .testimonials-header {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.8rem;
  }

  .container {
    padding: 0 16px;
  }

  .pricing-card {
    padding: 28px 20px;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
  }
}