/* ===== CSS Variables ===== */
:root {
  --color-primary: #606163;
  --color-secondary: #57585a;
  --color-accent: #c9aa9e;
  --color-accent2: #738db4;
  --color-accent3: #abb4ae;
  --color-bg: #0e0e10;
  --color-bg-alt: #16161a;
  --color-bg-card: #1c1c21;
  --color-text: #e8e8ea;
  --color-text-muted: #9a9aa0;
  --color-border: rgba(255,255,255,0.08);
  --color-glass: rgba(22,22,26,0.75);
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,0.35);
  --shadow-lg: 0 12px 48px rgba(0,0,0,0.5);
  --transition: 0.3s ease;
  --max-width: 1200px;
}

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

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

body {
  font-family: 'Inter', 'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR', sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

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

/* ===== Animations ===== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes pulse {
  0%,100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}
.animate { opacity: 0; transform: translateY(30px); transition: opacity 0.7s ease, transform 0.7s ease; }
.animate.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: var(--color-glass);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--color-border);
  padding: 10px 0;
}
header .container {
  display: flex; align-items: center; justify-content: space-between;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 1rem; color: var(--color-text);
}
.logo img { width: 32px; height: 32px; border-radius: 6px; }

nav { display: flex; align-items: center; gap: 8px; }
nav a {
  display: flex; align-items: center; gap: 6px;
  padding: 8px 14px; border-radius: var(--radius-sm);
  font-size: 0.9rem; color: var(--color-text-muted);
  transition: var(--transition);
}
nav a:hover { color: var(--color-text); background: rgba(255,255,255,0.06); }
nav a i { font-size: 0.85rem; }

.header-right { display: flex; align-items: center; gap: 12px; }

/* Language Switcher */
.lang-switch {
  position: relative;
}
.lang-switch-btn {
  display: flex; align-items: center; gap: 6px;
  padding: 8px 12px; border-radius: var(--radius-sm);
  font-size: 0.85rem; color: var(--color-text-muted);
  cursor: pointer; background: transparent; border: 1px solid var(--color-border);
  transition: var(--transition);
}
.lang-switch-btn:hover { color: var(--color-text); border-color: rgba(255,255,255,0.18); }
.lang-dropdown {
  display: none; position: absolute; top: calc(100% + 8px); right: 0;
  background: var(--color-bg-card); border: 1px solid var(--color-border);
  border-radius: var(--radius-sm); min-width: 160px;
  box-shadow: var(--shadow-lg); overflow: hidden; z-index: 100;
}
.lang-switch.open .lang-dropdown { display: block; }
.lang-dropdown a {
  display: block; padding: 10px 16px; font-size: 0.85rem;
  color: var(--color-text-muted); transition: var(--transition);
}
.lang-dropdown a:hover { background: rgba(255,255,255,0.06); color: var(--color-text); }
.lang-dropdown a.active { color: var(--color-accent); font-weight: 600; }

/* CTA Button */
.btn-cta {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 22px; border-radius: 50px;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent2));
  color: #fff; font-weight: 600; font-size: 0.9rem;
  border: none; cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(201,170,158,0.3);
}
.btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(201,170,158,0.45);
}

.btn-cta-outline {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 22px; border-radius: 50px;
  background: transparent;
  color: var(--color-accent);
  font-weight: 600; font-size: 0.9rem;
  border: 1.5px solid var(--color-accent);
  cursor: pointer; transition: var(--transition);
}
.btn-cta-outline:hover {
  background: rgba(201,170,158,0.1);
  transform: translateY(-2px);
}

/* Hamburger */
.hamburger {
  display: none; flex-direction: column; gap: 5px; cursor: pointer;
  background: none; border: none; padding: 8px;
}
.hamburger span {
  width: 24px; height: 2px; background: var(--color-text);
  border-radius: 2px; transition: var(--transition);
}

/* Mobile Nav */
.mobile-nav {
  display: none; position: fixed; inset: 0; z-index: 999;
  background: rgba(14,14,16,0.97);
  backdrop-filter: blur(20px);
  flex-direction: column; align-items: center; justify-content: center; gap: 12px;
}
.mobile-nav.open { display: flex; }
.mobile-nav a {
  font-size: 1.25rem; padding: 14px 24px; color: var(--color-text-muted);
  transition: var(--transition);
}
.mobile-nav a:hover { color: var(--color-text); }
.mobile-nav .btn-cta { margin-top: 16px; font-size: 1.1rem; padding: 14px 32px; }
.mobile-nav-close {
  position: absolute; top: 20px; right: 24px;
  background: none; border: none; color: var(--color-text);
  font-size: 2rem; cursor: pointer;
}
.mobile-nav .lang-mobile { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; justify-content: center; }
.mobile-nav .lang-mobile a { font-size: 0.9rem; padding: 8px 16px; border: 1px solid var(--color-border); border-radius: var(--radius-sm); }

/* ===== Hero ===== */
.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(201,170,158,0.12) 0%, transparent 60%);
  pointer-events: none;
}
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 800; line-height: 1.2;
  margin-bottom: 20px; position: relative;
}
.hero h1 span {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p {
  font-size: 1.15rem; color: var(--color-text-muted);
  max-width: 620px; margin: 0 auto 36px; position: relative;
}
.hero .btn-cta {
  font-size: 1.05rem; padding: 14px 32px;
  position: relative;
}

/* ===== Section Title ===== */
.section-title {
  text-align: center; margin-bottom: 56px;
}
.section-title h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700; margin-bottom: 14px;
}
.section-title p {
  color: var(--color-text-muted); max-width: 560px; margin: 0 auto;
}

/* ===== Features ===== */
.features { padding: 100px 0; }
.features-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.feature-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius); padding: 36px 28px;
  transition: var(--transition);
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(201,170,158,0.25);
  box-shadow: var(--shadow);
}
.feature-card .icon {
  width: 52px; height: 52px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, rgba(201,170,158,0.15), rgba(115,141,180,0.15));
  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-muted); line-height: 1.6; }

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

/* ===== Use Cases ===== */
.use-cases { padding: 100px 0; background: var(--color-bg-alt); }
.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); padding: 32px 24px;
  text-align: center; transition: var(--transition);
}
.use-case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.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(201,170,158,0.15); color: var(--color-accent); }
.use-case-card:nth-child(2) .icon { background: rgba(115,141,180,0.15); color: var(--color-accent2); }
.use-case-card:nth-child(3) .icon { background: rgba(171,180,174,0.15); color: var(--color-accent3); }
.use-case-card:nth-child(4) .icon { background: rgba(201,170,158,0.15); color: var(--color-accent); }
.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-muted); }

/* ===== Pricing ===== */
.pricing { padding: 100px 0; }
.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); padding: 40px 32px;
  position: relative; transition: var(--transition);
}
.pricing-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.pricing-card.popular {
  border-color: var(--color-accent);
  box-shadow: 0 0 40px rgba(201,170,158,0.15);
}
.pricing-card .badge {
  position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent2));
  color: #fff; font-size: 0.78rem; font-weight: 600;
  padding: 5px 18px; border-radius: 50px;
  white-space: nowrap;
}
.pricing-card .plan-name { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; color: var(--color-text-muted); }
.pricing-card .price {
  font-size: 2.8rem; font-weight: 800; margin-bottom: 6px;
}
.pricing-card .price span { font-size: 0.95rem; font-weight: 400; color: var(--color-text-muted); }
.pricing-card .price-note { font-size: 0.85rem; color: var(--color-text-muted); margin-bottom: 28px; }
.pricing-card ul { margin-bottom: 32px; }
.pricing-card li {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 0; font-size: 0.9rem; color: var(--color-text-muted);
}
.pricing-card li i.fa-check { color: var(--color-accent); }
.pricing-card li i.fa-xmark { color: #555; }
.pricing-card li.disabled { opacity: 0.45; }
.pricing-card .btn-cta { width: 100%; justify-content: center; }
.pricing-card .btn-cta-outline { width: 100%; justify-content: center; }

/* ===== Testimonials ===== */
.testimonials { padding: 100px 0; background: var(--color-bg-alt); }
.testimonials-stats {
  display: flex; align-items: center; justify-content: center; gap: 40px;
  margin-bottom: 52px; flex-wrap: wrap;
}
.stat-item { text-align: center; }
.stat-item .number { font-size: 2.2rem; font-weight: 800; color: var(--color-accent); }
.stat-item .label { font-size: 0.85rem; color: var(--color-text-muted); }
.stars { color: #f5a623; font-size: 1.1rem; margin-bottom: 4px; }

.testimonials-carousel {
  position: relative; overflow: hidden;
}
.testimonials-track {
  display: flex; transition: transform 0.5s ease;
}
.testimonial-card {
  min-width: 100%;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
  padding: 0 24px;
}
.testimonial-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius); padding: 28px;
}
.testimonial-item .stars { margin-bottom: 14px; }
.testimonial-item blockquote {
  font-size: 0.92rem; color: var(--color-text-muted);
  line-height: 1.7; margin-bottom: 18px; font-style: italic;
}
.testimonial-item .author {
  display: flex; align-items: center; gap: 12px;
}
.testimonial-item .avatar {
  width: 40px; height: 40px; border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent2));
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.9rem; color: #fff;
}
.testimonial-item .author-info .name { font-size: 0.88rem; font-weight: 600; }
.testimonial-item .author-info .role { font-size: 0.78rem; color: var(--color-text-muted); }

.carousel-dots {
  display: flex; justify-content: center; gap: 10px; margin-top: 36px;
}
.carousel-dots .dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--color-border); cursor: pointer;
  transition: var(--transition); border: none;
}
.carousel-dots .dot.active {
  background: var(--color-accent); width: 28px; border-radius: 5px;
}

.testimonial-tags {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 36px;
}
.testimonial-tags span {
  padding: 6px 16px; border-radius: 50px;
  background: rgba(201,170,158,0.1); color: var(--color-accent);
  font-size: 0.82rem; border: 1px solid rgba(201,170,158,0.2);
}

/* ===== Comparison ===== */
.comparison { padding: 100px 0; }
.comparison-table-wrap {
  overflow-x: auto; -webkit-overflow-scrolling: touch;
  border-radius: var(--radius);
}
.comparison-table {
  width: 100%; min-width: 560px; border-collapse: separate; border-spacing: 0;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius); overflow: hidden;
}
.comparison-table th,
.comparison-table td {
  padding: 18px 24px; text-align: center;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.9rem;
}
.comparison-table thead th {
  background: rgba(255,255,255,0.03);
  font-weight: 600; color: var(--color-text);
}
.comparison-table thead th:first-child { text-align: left; }
.comparison-table tbody td:first-child { text-align: left; font-weight: 500; }
.comparison-table tbody tr:last-child td { border-bottom: none; }
.comparison-table .highlight {
  background: rgba(201,170,158,0.06);
}
.comparison-table .highlight th {
  color: var(--color-accent); font-weight: 700;
}
.comparison-table i.fa-check { color: var(--color-accent); font-size: 1.1rem; }
.comparison-table i.fa-xmark { color: #555; font-size: 1.1rem; }

/* ===== FAQ ===== */
.faq { padding: 100px 0; background: var(--color-bg-alt); }
.faq-list { max-width: 780px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm); margin-bottom: 12px;
  background: var(--color-bg-card); overflow: hidden;
}
.faq-question {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 24px; cursor: pointer;
  font-weight: 600; font-size: 0.95rem;
  transition: var(--transition);
  width: 100%; background: none; border: none; color: var(--color-text); text-align: left;
}
.faq-question:hover { background: rgba(255,255,255,0.03); }
.faq-question i { transition: transform 0.3s ease; color: var(--color-text-muted); }
.faq-item.open .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.open .faq-answer { max-height: 300px; }
.faq-answer p {
  padding: 0 24px 20px; font-size: 0.9rem;
  color: var(--color-text-muted); line-height: 1.7;
}

/* ===== Final CTA ===== */
.final-cta {
  padding: 100px 0; text-align: center;
  background: linear-gradient(135deg, rgba(201,170,158,0.1), rgba(115,141,180,0.1));
  position: relative; overflow: hidden;
}
.final-cta::before {
  content: '';
  position: absolute; top: -200px; left: 50%; transform: translateX(-50%);
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(201,170,158,0.12) 0%, transparent 60%);
  pointer-events: none;
}
.final-cta h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800; margin-bottom: 16px; position: relative;
}
.final-cta p {
  font-size: 1.1rem; color: var(--color-text-muted);
  margin-bottom: 36px; position: relative;
}
.final-cta .btn-cta {
  font-size: 1.1rem; padding: 16px 40px; position: relative;
}

/* ===== Footer ===== */
footer {
  padding: 48px 0 32px;
  border-top: 1px solid var(--color-border);
}
.footer-content {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 20px;
}
.footer-links { display: flex; gap: 24px; flex-wrap: wrap; }
.footer-links a {
  font-size: 0.85rem; color: var(--color-text-muted);
  transition: var(--transition);
}
.footer-links a:hover { color: var(--color-text); }
.footer-copy { font-size: 0.82rem; color: var(--color-text-muted); }

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed; bottom: 30px; right: 30px;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--color-bg-card); border: 1px solid var(--color-border);
  color: var(--color-text); font-size: 1rem;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; opacity: 0; visibility: hidden;
  transition: var(--transition); z-index: 90;
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover {
  background: var(--color-accent);
  color: #fff; border-color: var(--color-accent);
  transform: translateY(-3px);
}

/* ===== 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 { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  nav { display: none; }
  .hamburger { display: flex; }
  .lang-switch-btn span { display: none; }
  .lang-switch-btn { padding: 8px; border: none; }
  .features-grid { grid-template-columns: 1fr; }
  .use-cases-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .testimonials-stats { gap: 24px; }
  .comparison-table { font-size: 0.82rem; }
  .comparison-table th, .comparison-table td { padding: 12px 10px; }
  .hero { padding: 120px 0 60px; }
  .hero h1 { font-size: 2rem; }
  .footer-content { flex-direction: column; text-align: center; }
  .footer-links { justify-content: center; }
}

@media (max-width: 480px) {
  .pricing-card { padding: 28px 20px; }
  .testimonials-stats { flex-direction: column; }
}