/* ===== CSS Variables ===== */
:root {
  --color-primary: #0E0A1E;
  --color-secondary: #0E0A1E;
  --color-accent: #7C3AED;
  --color-accent2: #E91E8C;
  --color-bg-dark: #1A1040;
  --color-text: #E2E0EA;
  --color-text-muted: #9B97AD;
  --color-white: #FFFFFF;
  --color-card: rgba(124, 58, 237, 0.08);
  --color-card-border: rgba(124, 58, 237, 0.18);
  --gradient-accent: linear-gradient(135deg, #7C3AED 0%, #E91E8C 100%);
  --gradient-hero: radial-gradient(ellipse at 60% 0%, rgba(124,58,237,0.25) 0%, transparent 60%),
                   radial-gradient(ellipse at 20% 100%, rgba(233,30,140,0.15) 0%, transparent 50%);
  --shadow-card: 0 4px 24px rgba(124, 58, 237, 0.10);
  --shadow-btn: 0 4px 20px rgba(124, 58, 237, 0.35);
  --radius: 14px;
  --radius-sm: 8px;
  --transition: 0.3s cubic-bezier(.4,0,.2,1);
  --font-heading: 'Inter', 'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR', sans-serif;
}

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

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

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

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

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

/* ===== Section Common ===== */
section {
  padding: 100px 0;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.4rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 16px;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto 56px;
}

/* ===== Scroll Reveal ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s var(--transition), transform 0.7s var(--transition);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Header / Nav ===== */
.site-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);
}

.site-header.scrolled {
  background: rgba(14, 10, 30, 0.92);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow: 0 2px 24px rgba(0,0,0,0.3);
  padding: 10px 0;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.35rem;
  color: var(--color-white);
}

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

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

.nav-links a {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
}

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

.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: 0.9rem;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition);
  font-family: var(--font-body);
}

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

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: rgba(26, 16, 64, 0.97);
  backdrop-filter: blur(18px);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-sm);
  min-width: 160px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition);
  overflow: hidden;
  z-index: 100;
}

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

.lang-dropdown a {
  display: block;
  padding: 10px 18px;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  transition: all var(--transition);
}

.lang-dropdown a:hover,
.lang-dropdown a.active {
  background: rgba(124, 58, 237, 0.15);
  color: var(--color-white);
}

/* CTA Button */
.btn-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: var(--gradient-accent);
  color: var(--color-white);
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: var(--shadow-btn);
  font-family: var(--font-body);
}

.btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(124, 58, 237, 0.5);
}

.btn-cta-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: transparent;
  color: var(--color-accent);
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: 50px;
  border: 2px solid var(--color-accent);
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-body);
}

.btn-cta-outline:hover {
  background: rgba(124, 58, 237, 0.1);
  transform: translateY(-2px);
}

.btn-cta-sm {
  padding: 10px 22px;
  font-size: 0.9rem;
}

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

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-white);
  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); }

/* ===== Hero ===== */
.hero {
  min-height: 92vh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: 100px;
  background: var(--gradient-hero);
}

.hero::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(124,58,237,0.12) 0%, transparent 70%);
  transform: translate(-50%,-50%);
  pointer-events: none;
}

.hero-content {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-family: var(--font-heading);
  font-size: 3.6rem;
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 24px;
  color: var(--color-white);
}

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

.hero p {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  max-width: 620px;
  margin: 0 auto 40px;
  line-height: 1.8;
}

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

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-top: 56px;
  flex-wrap: wrap;
}

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

.hero-stat .number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-white);
  display: block;
}

.hero-stat .label {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

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

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

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

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
  border-color: rgba(124, 58, 237, 0.35);
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  background: rgba(124, 58, 237, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.4rem;
  color: var(--color-accent);
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 10px;
}

.feature-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

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

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

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

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

.use-case-card:nth-child(1) .use-case-icon { color: #7C3AED; background: rgba(124,58,237,0.12); }
.use-case-card:nth-child(2) .use-case-icon { color: #E91E8C; background: rgba(233,30,140,0.12); }
.use-case-card:nth-child(3) .use-case-icon { color: #3AEDE9; background: rgba(58,237,233,0.12); }
.use-case-card:nth-child(4) .use-case-icon { color: #EDC93A; background: rgba(237,201,58,0.12); }

.use-case-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 h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 10px;
}

.use-case-card p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ===== Pricing ===== */
.pricing {
  background: var(--color-bg-dark);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: start;
}

.pricing-card {
  background: var(--color-card);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius);
  padding: 40px 32px;
  text-align: center;
  position: relative;
  transition: all var(--transition);
}

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

.pricing-card.popular {
  border-color: var(--color-accent);
  box-shadow: 0 0 40px rgba(124, 58, 237, 0.2);
  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: var(--gradient-accent);
  color: var(--color-white);
  padding: 4px 20px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 700;
  white-space: nowrap;
}

.pricing-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 8px;
}

.pricing-price {
  font-size: 2.8rem;
  font-weight: 900;
  color: var(--color-white);
  margin-bottom: 4px;
}

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

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

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

.pricing-features li {
  padding: 8px 0;
  color: var(--color-text);
  font-size: 0.92rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.pricing-features li i {
  font-size: 0.85rem;
}

.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;
}

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

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

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

.rating-score {
  font-size: 3.2rem;
  font-weight: 900;
  color: var(--color-white);
  line-height: 1;
}

.rating-stars {
  color: #FBBF24;
  font-size: 1.1rem;
  margin: 8px 0 4px;
  letter-spacing: 2px;
}

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

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

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

.testimonial-card:hover {
  box-shadow: var(--shadow-card);
}

.testimonial-stars {
  color: #FBBF24;
  font-size: 0.9rem;
  margin-bottom: 14px;
  letter-spacing: 2px;
}

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

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

.testimonial-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-weight: 700;
  font-size: 1rem;
}

.testimonial-name {
  font-weight: 600;
  color: var(--color-white);
  font-size: 0.95rem;
}

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

.testimonials-tags {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 40px;
  flex-wrap: wrap;
}

.testimonials-tags span {
  padding: 6px 18px;
  background: rgba(124, 58, 237, 0.1);
  border: 1px solid var(--color-card-border);
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

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

.comparison-table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--color-card-border);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 600px;
}

.comparison-table th,
.comparison-table td {
  padding: 18px 24px;
  text-align: center;
  font-size: 0.95rem;
  border-bottom: 1px solid rgba(124, 58, 237, 0.1);
}

.comparison-table th {
  background: rgba(124, 58, 237, 0.08);
  color: var(--color-white);
  font-weight: 700;
  font-size: 0.95rem;
}

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

.comparison-table td {
  color: var(--color-text-muted);
}

.comparison-table .highlight {
  background: rgba(124, 58, 237, 0.06);
  color: var(--color-white);
}

.comparison-table .highlight .fa-check {
  color: var(--color-accent);
}

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

.comparison-table .fa-check { color: var(--color-accent); font-size: 1rem; }
.comparison-table .fa-xmark { color: #555; font-size: 1rem; }

/* ===== FAQ ===== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

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

.faq-item:hover {
  border-color: rgba(124, 58, 237, 0.35);
}

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

.faq-question:hover {
  background: rgba(124, 58, 237, 0.1);
}

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

.faq-answer p {
  padding: 0 24px 20px;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.8;
}

/* ===== Final CTA ===== */
.final-cta {
  background: var(--gradient-accent);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.final-cta::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(255,255,255,0.05) 0%, transparent 50%);
  pointer-events: none;
}

.final-cta h2 {
  font-family: var(--font-heading);
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--color-white);
  margin-bottom: 16px;
  position: relative;
}

.final-cta p {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.85);
  margin-bottom: 36px;
  position: relative;
}

.final-cta .btn-cta {
  background: var(--color-white);
  color: var(--color-accent);
  font-size: 1.1rem;
  padding: 16px 40px;
  box-shadow: 0 6px 30px rgba(0,0,0,0.2);
  position: relative;
}

.final-cta .btn-cta:hover {
  box-shadow: 0 8px 40px rgba(0,0,0,0.3);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--color-primary);
  padding: 60px 0 30px;
  border-top: 1px solid var(--color-card-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand .logo {
  margin-bottom: 16px;
}

.footer-brand p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
  max-width: 300px;
}

.footer-col h4 {
  color: var(--color-white);
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.footer-col a {
  display: block;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  padding: 5px 0;
  transition: color var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid var(--color-card-border);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p {
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.footer-bottom-links {
  display: flex;
  gap: 20px;
}

.footer-bottom-links a {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  transition: color var(--transition);
}

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

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 46px;
  height: 46px;
  background: var(--gradient-accent);
  color: var(--color-white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition);
  box-shadow: var(--shadow-btn);
  z-index: 999;
}

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

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

/* ===== Mobile Nav Overlay ===== */
.mobile-nav {
  position: fixed;
  inset: 0;
  background: rgba(14, 10, 30, 0.97);
  backdrop-filter: blur(20px);
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 28px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
}

.mobile-nav.open {
  opacity: 1;
  visibility: visible;
}

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

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

.mobile-nav .btn-cta {
  margin-top: 12px;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .use-cases-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  section { padding: 70px 0; }

  .section-title { font-size: 1.9rem; }

  .hero h1 { font-size: 2.4rem; }
  .hero p { font-size: 1.05rem; }
  .hero { min-height: 80vh; }
  .hero-stats { gap: 28px; }
  .hero-stat .number { font-size: 1.6rem; }

  .nav-links { display: none; }
  .hamburger { display: flex; }

  .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; }
  .pricing-card.popular { transform: none; }
  .pricing-card.popular:hover { transform: translateY(-4px); }
  .testimonials-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }

  .final-cta h2 { font-size: 2rem; }

  .lang-switcher { display: none; }
  .mobile-nav .lang-mobile { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
  .mobile-nav .lang-mobile a { font-size: 0.95rem; padding: 6px 14px; border: 1px solid var(--color-card-border); border-radius: var(--radius-sm); }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 1.9rem; }
  .section-title { font-size: 1.6rem; }
  .container { padding: 0 16px; }
  .final-cta h2 { font-size: 1.7rem; }
}