/* ===== CSS Variables ===== */
:root {
  --color-primary: #041424;
  --color-secondary: #041424;
  --color-accent: #cbcfd2;
  --color-muted: #7c848c;
  --color-muted-alt: #747c84;
  --color-white: #ffffff;
  --color-bg: #f5f7f9;
  --color-bg-alt: #eef1f4;
  --color-card: #ffffff;
  --color-border: #e2e6ea;
  --color-gradient-start: #041424;
  --color-gradient-end: #0c2d4a;
  --color-highlight: #1a6fb5;
  --color-highlight-light: #e8f2fb;
  --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;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(4,20,36,.08);
  --shadow-md: 0 4px 12px rgba(4,20,36,.1);
  --shadow-lg: 0 8px 30px rgba(4,20,36,.12);
  --transition: .3s ease;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-body);
  color: var(--color-primary);
  background: var(--color-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ===== Utility ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section-title {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: .6em;
}
.section-subtitle {
  text-align: center;
  color: var(--color-muted);
  font-size: 1.1rem;
  max-width: 640px;
  margin: 0 auto 3rem;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: .95rem;
  transition: var(--transition);
}
.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
}
.btn-primary:hover {
  background: var(--color-gradient-end);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.btn-outline {
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-2px);
}
.btn-white {
  background: var(--color-white);
  color: var(--color-primary);
}
.btn-white:hover {
  background: var(--color-bg);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.btn-lg { padding: 16px 40px; font-size: 1.1rem; border-radius: var(--radius-md); }

/* ===== Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .6s ease, transform .6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
  background: transparent;
}
.header.scrolled {
  background: rgba(4,20,36,.95);
  backdrop-filter: blur(12px);
  padding: 10px 0;
  box-shadow: 0 2px 20px rgba(0,0,0,.15);
}
.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-white);
}
.logo img { width: 32px; height: 32px; border-radius: 6px; }
.nav { display: flex; align-items: center; gap: 8px; }
.nav a {
  color: rgba(255,255,255,.85);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: .9rem;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav a:hover { color: var(--color-white); background: rgba(255,255,255,.1); }
.header-actions { display: flex; align-items: center; gap: 12px; }
.header .btn-primary {
  background: var(--color-white);
  color: var(--color-primary);
  padding: 8px 20px;
  font-size: .85rem;
}
.header .btn-primary:hover {
  background: var(--color-accent);
  transform: translateY(-1px);
}

/* Language Switcher */
.lang-switcher {
  position: relative;
}
.lang-btn {
  color: rgba(255,255,255,.85);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: .85rem;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}
.lang-btn:hover { color: var(--color-white); background: rgba(255,255,255,.1); }
.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 160px;
  padding: 8px 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: var(--transition);
  z-index: 100;
}
.lang-switcher:hover .lang-dropdown,
.lang-dropdown.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.lang-dropdown a {
  display: block;
  padding: 8px 20px;
  color: var(--color-primary);
  font-size: .85rem;
  transition: var(--transition);
}
.lang-dropdown a:hover { background: var(--color-bg); }
.lang-dropdown a.active { font-weight: 600; color: var(--color-highlight); }

/* Mobile Menu */
.menu-toggle {
  display: none;
  color: var(--color-white);
  font-size: 1.4rem;
  padding: 8px;
}
.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(4,20,36,.98);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
}
.mobile-nav.active { display: flex; }
.mobile-nav a {
  color: var(--color-white);
  font-size: 1.3rem;
  padding: 12px 24px;
}
.mobile-nav .close-btn {
  position: absolute;
  top: 20px;
  right: 24px;
  color: var(--color-white);
  font-size: 1.6rem;
}
.mobile-nav .lang-mobile { display: flex; flex-direction: column; gap: 8px; margin-top: 16px; }
.mobile-nav .lang-mobile a { font-size: 1rem; }

/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, var(--color-gradient-start) 0%, var(--color-gradient-end) 100%);
  padding: 140px 0 80px;
  text-align: center;
  color: var(--color-white);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(26,111,181,.25) 0%, transparent 70%);
  top: -100px;
  right: -100px;
  border-radius: 50%;
}
.hero::after {
  content: '';
  position: absolute;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(203,207,210,.1) 0%, transparent 70%);
  bottom: -100px;
  left: -100px;
  border-radius: 50%;
}
.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  position: relative;
  z-index: 1;
}
.hero h1 span { display: block; font-weight: 400; font-size: 1.3rem; margin-top: 12px; color: rgba(255,255,255,.8); }
.hero p {
  font-size: 1.15rem;
  color: rgba(255,255,255,.75);
  max-width: 600px;
  margin: 0 auto 32px;
  position: relative;
  z-index: 1;
}
.hero-btns {
  display: flex;
  gap: 16px;
  justify-content: center;
  position: relative;
  z-index: 1;
}

/* ===== Features ===== */
.features { padding: 80px 0; background: var(--color-bg); }
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}
.feature-card {
  background: var(--color-card);
  padding: 32px 28px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--color-highlight-light);
  color: var(--color-highlight);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  margin-bottom: 16px;
}
.feature-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.feature-card p { color: var(--color-muted); font-size: .9rem; line-height: 1.6; }
.features .center { text-align: center; }

/* ===== Use Cases ===== */
.use-cases { padding: 80px 0; }
.cases-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.case-card {
  text-align: center;
  padding: 36px 24px;
  border-radius: var(--radius-md);
  transition: var(--transition);
  border: 1px solid var(--color-border);
}
.case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}
.case-card:nth-child(1) .case-icon { background: #fef3e2; color: #e8850a; }
.case-card:nth-child(2) .case-icon { background: #e8f2fb; color: #1a6fb5; }
.case-card:nth-child(3) .case-icon { background: #f0e8fb; color: #7c3aed; }
.case-card:nth-child(4) .case-icon { background: #e8fbf0; color: #0a9e5c; }
.case-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin: 0 auto 16px;
}
.case-card h3 { font-size: 1.05rem; margin-bottom: 8px; }
.case-card p { color: var(--color-muted); font-size: .88rem; line-height: 1.6; }

/* ===== Pricing ===== */
.pricing { padding: 80px 0; background: var(--color-bg); }
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: start;
}
.price-card {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
  border: 2px solid transparent;
}
.price-card:hover { box-shadow: var(--shadow-lg); }
.price-card.popular {
  border-color: var(--color-highlight);
  transform: scale(1.03);
}
.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-highlight);
  color: var(--color-white);
  font-size: .75rem;
  font-weight: 600;
  padding: 4px 16px;
  border-radius: 20px;
  white-space: nowrap;
}
.price-card h3 { font-size: 1.2rem; margin-bottom: 4px; }
.price-card .price-desc { color: var(--color-muted); font-size: .85rem; margin-bottom: 20px; }
.price-amount { font-size: 2.6rem; font-weight: 800; margin-bottom: 4px; }
.price-amount span { font-size: .9rem; font-weight: 400; color: var(--color-muted); }
.price-period { color: var(--color-muted); font-size: .85rem; margin-bottom: 24px; }
.price-features { margin-bottom: 28px; }
.price-features li {
  padding: 8px 0;
  font-size: .9rem;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-muted-alt);
}
.price-features li i { font-size: .8rem; }
.price-features li i.fa-check { color: #0a9e5c; }
.price-features li i.fa-xmark { color: #dc3545; }
.price-card .btn { width: 100%; justify-content: center; }

/* ===== Testimonials ===== */
.testimonials { padding: 80px 0; }
.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: 3rem; font-weight: 800; }
.rating-stars { color: #f0a500; font-size: 1.1rem; margin: 4px 0; }
.rating-count { color: var(--color-muted); font-size: .85rem; }
.rating-bars { display: flex; flex-direction: column; gap: 4px; }
.rating-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .8rem;
  color: var(--color-muted);
}
.rating-bar .bar {
  width: 120px;
  height: 6px;
  background: var(--color-bg);
  border-radius: 3px;
  overflow: hidden;
}
.rating-bar .bar-fill {
  height: 100%;
  background: #f0a500;
  border-radius: 3px;
}
.testimonials-carousel {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}
.testimonial-card {
  background: var(--color-bg);
  padding: 28px;
  border-radius: var(--radius-md);
  transition: var(--transition);
}
.testimonial-card:hover { box-shadow: var(--shadow-md); }
.testimonial-stars { color: #f0a500; font-size: .9rem; margin-bottom: 12px; }
.testimonial-card p { font-size: .92rem; line-height: 1.7; margin-bottom: 16px; color: var(--color-muted-alt); }
.testimonial-author { display: flex; align-items: center; gap: 12px; }
.testimonial-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-highlight-light);
  color: var(--color-highlight);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: .85rem;
}
.testimonial-name { font-weight: 600; font-size: .88rem; }
.testimonial-role { font-size: .78rem; color: var(--color-muted); }
.testimonial-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}
.testimonial-tags span {
  background: var(--color-bg);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: .8rem;
  color: var(--color-muted-alt);
}

/* ===== Comparison ===== */
.comparison { padding: 80px 0; background: var(--color-bg); }
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.comparison-table th,
.comparison-table td {
  padding: 16px 20px;
  text-align: center;
  font-size: .9rem;
  border-bottom: 1px solid var(--color-border);
}
.comparison-table thead th {
  background: var(--color-primary);
  color: var(--color-white);
  font-weight: 600;
}
.comparison-table .highlight-col {
  background: var(--color-highlight-light);
  font-weight: 600;
}
.comparison-table thead .highlight-col {
  background: var(--color-highlight);
}
.comparison-table td:first-child { text-align: left; font-weight: 500; }
.comparison-table .check { color: #0a9e5c; font-weight: 700; }
.comparison-table .cross { color: #dc3545; }

/* ===== FAQ ===== */
.faq { padding: 80px 0; }
.faq-list { max-width: 760px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.active { border-color: var(--color-highlight); }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  width: 100%;
  font-size: .95rem;
  font-weight: 600;
  text-align: left;
  transition: var(--transition);
}
.faq-question:hover { color: var(--color-highlight); }
.faq-question i { transition: transform .3s ease; font-size: .85rem; color: var(--color-muted); }
.faq-item.active .faq-question i { transform: rotate(180deg); color: var(--color-highlight); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s ease;
}
.faq-answer-inner {
  padding: 0 24px 20px;
  color: var(--color-muted-alt);
  font-size: .9rem;
  line-height: 1.7;
}

/* ===== CTA ===== */
.cta-section {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--color-gradient-start) 0%, var(--color-gradient-end) 100%);
  text-align: center;
  color: var(--color-white);
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255,255,255,.05) 0%, transparent 70%);
  top: -200px;
  left: -200px;
  border-radius: 50%;
}
.cta-section h2 { font-size: 2.2rem; font-weight: 700; margin-bottom: 12px; position: relative; z-index: 1; }
.cta-section p {
  font-size: 1.1rem;
  color: rgba(255,255,255,.75);
  margin-bottom: 32px;
  position: relative;
  z-index: 1;
}

/* ===== Footer ===== */
.footer {
  background: var(--color-primary);
  color: rgba(255,255,255,.6);
  padding: 48px 0 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 36px;
}
.footer-brand .logo { margin-bottom: 12px; }
.footer-brand p { font-size: .85rem; line-height: 1.7; max-width: 280px; }
.footer h4 {
  color: var(--color-white);
  font-size: .9rem;
  margin-bottom: 16px;
}
.footer ul li { margin-bottom: 8px; }
.footer ul a {
  font-size: .85rem;
  transition: var(--transition);
}
.footer ul a:hover { color: var(--color-white); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: .8rem;
}
.footer-bottom-links { display: flex; gap: 20px; }
.footer-bottom-links a:hover { color: var(--color-white); }

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: var(--transition);
  z-index: 900;
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  background: var(--color-gradient-end);
  transform: translateY(-2px);
}

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

@media (max-width: 768px) {
  .nav { display: none; }
  .menu-toggle { display: block; }
  .header .btn-primary { display: none; }
  .hero { padding: 120px 0 60px; }
  .hero h1 { font-size: 2rem; }
  .hero h1 span { font-size: 1.05rem; }
  .hero p { font-size: 1rem; }
  .hero-btns { flex-direction: column; align-items: center; }
  .section-title { font-size: 1.6rem; }
  .features-grid,
  .cases-grid,
  .pricing-grid,
  .testimonials-carousel { grid-template-columns: 1fr; }
  .price-card.popular { transform: none; }
  .testimonials-header { flex-direction: column; }
  .comparison-table { font-size: .8rem; }
  .comparison-table th, .comparison-table td { padding: 10px 8px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
  .cta-section h2 { font-size: 1.6rem; }
  .lang-switcher { display: none; }
}