@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: #130c1a;
  --color-secondary: #130d1a;
  --color-accent: #d55bb5;
  --color-muted: #847594;
  --color-text-light: #848c94;
  --color-white: #ffffff;
  --color-bg-dark: #0e0813;
  --color-bg-card: rgba(255, 255, 255, 0.04);
  --color-bg-card-hover: rgba(255, 255, 255, 0.08);
  --color-border: rgba(255, 255, 255, 0.08);
  --color-accent-gradient: linear-gradient(135deg, #d55bb5, #a855f7);
  --color-hero-gradient: linear-gradient(180deg, #1a0f24 0%, #0e0813 100%);
  --color-cta-gradient: linear-gradient(135deg, #d55bb5 0%, #9b30a0 50%, #6a1b9a 100%);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 40px rgba(213, 91, 181, 0.15);
  --font-primary: 'Inter', 'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR', sans-serif;
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-primary);
  background-color: var(--color-bg-dark);
  color: var(--color-white);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

ul {
  list-style: none;
}

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

.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-base), box-shadow var(--transition-base), padding var(--transition-base);
}

.header.scrolled {
  background: rgba(14, 8, 19, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.4);
  padding: 10px 0;
}

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

.header__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-white);
}

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

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

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

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

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

.header__nav-links a i {
  font-size: 0.8rem;
}

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

.lang-switcher__btn {
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-text-light);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-family: var(--font-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-base);
}

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

.lang-switcher__dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: rgba(20, 12, 28, 0.98);
  backdrop-filter: blur(20px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  min-width: 160px;
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-card);
}

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

.lang-switcher__dropdown a {
  display: block;
  padding: 8px 14px;
  font-size: 0.85rem;
  color: var(--color-text-light);
  border-radius: 6px;
  transition: all var(--transition-base);
}

.lang-switcher__dropdown a:hover,
.lang-switcher__dropdown a.active {
  background: rgba(213, 91, 181, 0.1);
  color: var(--color-accent);
}

/* CTA Button */
.btn-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  background: var(--color-accent-gradient);
  color: var(--color-white);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-xl);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  box-shadow: 0 4px 20px rgba(213, 91, 181, 0.3);
  white-space: nowrap;
}

.btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 30px rgba(213, 91, 181, 0.45);
}

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

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

/* Mobile Menu (hidden by default on all viewports; revealed on mobile when .active) */
.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: rgba(14, 8, 19, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.mobile-menu.active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.mobile-menu a {
  font-size: 1.3rem;
  font-weight: 500;
  color: var(--color-white);
  padding: 12px 0;
}

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

.mobile-menu__close {
  position: absolute;
  top: 20px;
  right: 24px;
  background: none;
  border: none;
  color: var(--color-white);
  font-size: 1.8rem;
  cursor: pointer;
}

/* ==================== HERO ==================== */
.hero {
  padding: 140px 0 80px;
  background: var(--color-hero-gradient);
  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(213, 91, 181, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero__title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

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

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

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

/* ==================== SECTIONS COMMON ==================== */
section {
  padding: 100px 0;
}

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

.section-header h2 {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

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

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

.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

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

.feature-card:hover {
  background: var(--color-bg-card-hover);
  border-color: rgba(213, 91, 181, 0.2);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.feature-card__icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(213, 91, 181, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.3rem;
  color: var(--color-accent);
}

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

.feature-card p {
  font-size: 0.92rem;
  color: var(--color-text-light);
  line-height: 1.65;
}

.features__cta {
  text-align: center;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: transparent;
  color: var(--color-accent);
  font-size: 0.95rem;
  font-weight: 600;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: all var(--transition-base);
}

.btn-secondary:hover {
  background: rgba(213, 91, 181, 0.1);
  transform: translateY(-2px);
}

/* ==================== USE CASES ==================== */
.use-cases {
  background: var(--color-secondary);
}

.use-cases__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

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

.use-case-card:hover {
  background: var(--color-bg-card-hover);
  transform: translateY(-4px);
}

.use-case-card__icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 18px;
  font-size: 1.5rem;
}

.use-case-card:nth-child(1) .use-case-card__icon {
  background: rgba(213, 91, 181, 0.12);
  color: #d55bb5;
}

.use-case-card:nth-child(2) .use-case-card__icon {
  background: rgba(168, 85, 247, 0.12);
  color: #a855f7;
}

.use-case-card:nth-child(3) .use-case-card__icon {
  background: rgba(132, 117, 148, 0.15);
  color: #847594;
}

.use-case-card:nth-child(4) .use-case-card__icon {
  background: rgba(132, 140, 148, 0.15);
  color: #848c94;
}

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

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

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

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

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

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

.pricing-card--popular {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-glow);
}

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

.pricing-card__name {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-muted);
}

.pricing-card__price {
  font-size: 2.8rem;
  font-weight: 800;
  margin-bottom: 4px;
}

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

.pricing-card__desc {
  font-size: 0.88rem;
  color: var(--color-text-light);
  margin-bottom: 28px;
}

.pricing-card__features {
  margin-bottom: 32px;
}

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

.pricing-card__features li i {
  font-size: 0.8rem;
  width: 20px;
  text-align: center;
}

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

.pricing-card__features li i.fa-xmark {
  color: rgba(132, 140, 148, 0.4);
}

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

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

/* ==================== TESTIMONIALS ==================== */
.testimonials {
  background: var(--color-secondary);
}

.testimonials__summary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.testimonials__rating {
  text-align: center;
}

.testimonials__stars {
  color: #f59e0b;
  font-size: 1.4rem;
  margin-bottom: 6px;
}

.testimonials__score {
  font-size: 2rem;
  font-weight: 700;
}

.testimonials__count {
  font-size: 0.88rem;
  color: var(--color-text-light);
}

.testimonials__tags {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.testimonials__tags span {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.82rem;
  color: var(--color-text-light);
}

.testimonials__carousel {
  position: relative;
  overflow: hidden;
}

.testimonials__track {
  display: flex;
  transition: transform 0.5s ease;
}

.testimonial-card {
  min-width: 100%;
  padding: 0 24px;
}

.testimonial-card__inner {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px;
  max-width: 700px;
  margin: 0 auto;
}

.testimonial-card__stars {
  color: #f59e0b;
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.testimonial-card__text {
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 20px;
  font-style: italic;
  color: rgba(255, 255, 255, 0.85);
}

.testimonial-card__author {
  font-size: 0.9rem;
  font-weight: 600;
}

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

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

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

.testimonials__controls button:hover {
  background: rgba(213, 91, 181, 0.15);
  border-color: var(--color-accent);
}

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

.comparison__table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

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

.comparison__table th,
.comparison__table td {
  padding: 16px 24px;
  text-align: center;
  font-size: 0.92rem;
  border-bottom: 1px solid var(--color-border);
}

.comparison__table thead th {
  background: rgba(255, 255, 255, 0.04);
  font-weight: 600;
  font-size: 0.95rem;
}

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

.comparison__table tbody td:first-child {
  text-align: left;
  font-weight: 500;
}

.comparison__table .highlight {
  background: rgba(213, 91, 181, 0.06);
}

.comparison__table .highlight th,
.comparison__table thead .highlight {
  color: var(--color-accent);
}

.comparison__table i.fa-check {
  color: var(--color-accent);
}

.comparison__table i.fa-xmark {
  color: rgba(132, 140, 148, 0.4);
}

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

/* ==================== FAQ ==================== */
.faq {
  background: var(--color-secondary);
}

.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-base);
}

.faq__item.active {
  border-color: rgba(213, 91, 181, 0.3);
}

.faq__question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  background: none;
  border: none;
  color: var(--color-white);
  font-size: 1rem;
  font-weight: 500;
  font-family: var(--font-primary);
  cursor: pointer;
  text-align: left;
  gap: 16px;
  transition: color var(--transition-base);
}

.faq__question:hover {
  color: var(--color-accent);
}

.faq__question i {
  font-size: 0.8rem;
  transition: transform var(--transition-base);
  flex-shrink: 0;
}

.faq__item.active .faq__question i {
  transform: rotate(180deg);
}

.faq__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
}

.faq__answer-inner {
  padding: 0 24px 20px;
  font-size: 0.92rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ==================== FINAL CTA ==================== */
.final-cta {
  padding: 100px 0;
  background: var(--color-cta-gradient);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.final-cta::before {
  content: '';
  position: absolute;
  top: -100px;
  right: -100px;
  width: 400px;
  height: 400px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 50%;
  pointer-events: none;
}

.final-cta h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.final-cta p {
  font-size: 1.15rem;
  opacity: 0.9;
  margin-bottom: 36px;
}

.final-cta .btn-cta {
  background: var(--color-white);
  color: var(--color-primary);
  font-size: 1.1rem;
  padding: 16px 40px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
}

.final-cta .btn-cta:hover {
  box-shadow: 0 8px 36px rgba(0, 0, 0, 0.35);
}

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

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer__brand p {
  font-size: 0.88rem;
  color: var(--color-text-light);
  line-height: 1.65;
  margin-top: 12px;
}

.footer__col h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.footer__col ul li {
  margin-bottom: 10px;
}

.footer__col ul li a {
  font-size: 0.85rem;
  color: var(--color-text-light);
  transition: color var(--transition-base);
}

.footer__col ul li a:hover {
  color: var(--color-accent);
}

.footer__bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--color-text-light);
}

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

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

/* ==================== BACK TO TOP ==================== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-accent-gradient);
  color: var(--color-white);
  border: none;
  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-base);
  box-shadow: 0 4px 16px rgba(213, 91, 181, 0.35);
  z-index: 999;
}

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

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(213, 91, 181, 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);
  }

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

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

  .header__nav .btn-cta {
    display: none;
  }

  .header__menu-toggle {
    display: block;
  }

  .header__nav {
    gap: 16px;
  }

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

  .hero__title {
    font-size: 2.2rem;
  }

  .hero__subtitle {
    font-size: 1rem;
  }

  section {
    padding: 70px 0;
  }

  .section-header 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;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer__bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

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

  .testimonials__summary {
    flex-direction: column;
    gap: 20px;
  }
}

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

  .container {
    padding: 0 16px;
  }
}