/* ========================================
   Dewy Chat — Global Styles
   ======================================== */

/* CSS Variables */
:root {
  --color-primary: #111523;
  --color-secondary: #131827;
  --color-accent-light: #b1c7dd;
  --color-accent: #579fd4;
  --color-accent-muted: #5f77a6;
  --color-white: #ffffff;
  --color-text: #e0e6ed;
  --color-text-muted: #8a9bb5;
  --color-border: rgba(177, 199, 221, 0.12);
  --color-card: rgba(19, 24, 39, 0.7);
  --color-card-hover: rgba(19, 24, 39, 0.9);
  --color-gradient-start: #111523;
  --color-gradient-end: #1a2035;
  --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: 20px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.3);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.4);
  --transition: 0.3s ease;
}

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

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;
  -moz-osx-font-smoothing: grayscale;
}

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

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

img {
  max-width: 100%;
  height: auto;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-white);
}

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

/* ========================================
   Header / Navigation
   ======================================== */
.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);
}

.header.scrolled {
  background: rgba(17, 21, 35, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 2px 20px rgba(0,0,0,0.3);
  padding: 10px 0;
}

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

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

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

.nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav a:hover {
  color: var(--color-white);
  background: rgba(255,255,255,0.05);
}

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

/* Language Switcher */
.lang-switcher {
  position: relative;
  margin-left: 8px;
}

.lang-switcher-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  background: none;
  border: none;
  font-family: inherit;
}

.lang-switcher-btn:hover {
  color: var(--color-white);
  background: rgba(255,255,255,0.05);
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--color-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 8px;
  min-width: 160px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition);
  box-shadow: var(--shadow-lg);
  z-index: 100;
}

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

.lang-dropdown a {
  display: block;
  padding: 8px 14px;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.lang-dropdown a:hover,
.lang-dropdown a.active {
  color: var(--color-white);
  background: rgba(255,255,255,0.05);
}

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

.btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(87, 159, 212, 0.4);
  color: var(--color-white);
}

.btn-cta-large {
  padding: 16px 40px;
  font-size: 1.1rem;
  border-radius: var(--radius-md);
}

.btn-cta-outline {
  background: transparent;
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
}

.btn-cta-outline:hover {
  background: rgba(87, 159, 212, 0.1);
  color: var(--color-accent-light);
}

/* Mobile Menu */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-white);
  font-size: 1.4rem;
  cursor: pointer;
  padding: 8px;
}

.mobile-nav {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(17, 21, 35, 0.98);
  backdrop-filter: blur(20px);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
}

.mobile-nav.active {
  display: flex;
  opacity: 1;
  visibility: visible;
}

.mobile-nav a {
  color: var(--color-white);
  font-size: 1.3rem;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.mobile-nav .close-btn {
  position: absolute;
  top: 20px;
  right: 24px;
  background: none;
  border: none;
  color: var(--color-white);
  font-size: 1.6rem;
  cursor: pointer;
}

.mobile-nav .mobile-lang-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

.mobile-nav .mobile-lang-list a {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  padding: 6px 12px;
}

/* ========================================
   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(87, 159, 212, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero h1 {
  font-size: 3.2rem;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--color-white) 0%, var(--color-accent-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero h1 span {
  display: block;
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--color-text-muted);
  margin-top: 8px;
  -webkit-text-fill-color: var(--color-text-muted);
}

.hero .subtitle {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto 32px;
  line-height: 1.8;
}

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

/* ========================================
   Section Common
   ======================================== */
.section {
  padding: 80px 0;
}

.section-alt {
  background: var(--color-secondary);
}

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

.section-title h2 {
  font-size: 2.2rem;
  margin-bottom: 12px;
}

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

/* ========================================
   Features Grid
   ======================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.feature-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  transition: all var(--transition);
}

.feature-card:hover {
  background: var(--color-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(87, 159, 212, 0.2);
}

.feature-card .icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, rgba(87, 159, 212, 0.15), rgba(95, 119, 166, 0.1));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.2rem;
  color: var(--color-accent);
}

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

.feature-card p {
  color: var(--color-text-muted);
  font-size: 0.92rem;
  line-height: 1.7;
}

.features-cta {
  text-align: center;
}

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

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

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

.usecase-card .icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 1.4rem;
}

.usecase-card:nth-child(1) .icon {
  background: rgba(87, 159, 212, 0.15);
  color: #579fd4;
}
.usecase-card:nth-child(2) .icon {
  background: rgba(177, 199, 221, 0.15);
  color: #b1c7dd;
}
.usecase-card:nth-child(3) .icon {
  background: rgba(95, 119, 166, 0.15);
  color: #5f77a6;
}
.usecase-card:nth-child(4) .icon {
  background: rgba(87, 159, 212, 0.15);
  color: #579fd4;
}

.usecase-card h3 {
  font-size: 1.05rem;
  margin-bottom: 10px;
}

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

/* ========================================
   Pricing
   ======================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: start;
}

.pricing-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  position: relative;
  transition: all var(--transition);
}

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

.pricing-card.popular {
  border-color: var(--color-accent);
  background: linear-gradient(180deg, rgba(87,159,212,0.08) 0%, var(--color-card) 100%);
}

.pricing-card .badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-muted));
  color: var(--color-white);
  padding: 4px 16px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
}

.pricing-card h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.pricing-card .price {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 4px;
}

.pricing-card .price span {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--color-text-muted);
}

.pricing-card .price-desc {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  margin-bottom: 24px;
}

.pricing-card ul {
  list-style: none;
  margin-bottom: 28px;
}

.pricing-card ul li {
  padding: 8px 0;
  font-size: 0.9rem;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid var(--color-border);
}

.pricing-card ul li:last-child {
  border-bottom: none;
}

.pricing-card ul li i {
  font-size: 0.8rem;
}

.pricing-card ul li i.fa-check {
  color: #4ade80;
}

.pricing-card ul li i.fa-xmark {
  color: #f87171;
}

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

/* ========================================
   Testimonials
   ======================================== */
.testimonials-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

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

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

.rating-overview .stars {
  color: #fbbf24;
  font-size: 1.1rem;
  margin: 4px 0;
}

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

.star-bars {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

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

.star-bar .bar {
  width: 120px;
  height: 6px;
  background: rgba(255,255,255,0.08);
  border-radius: 3px;
  overflow: hidden;
}

.star-bar .bar .fill {
  height: 100%;
  background: #fbbf24;
  border-radius: 3px;
}

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

.testimonials-track {
  display: flex;
  gap: 24px;
  transition: transform 0.5s ease;
}

.testimonial-card {
  min-width: calc(33.333% - 16px);
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  flex-shrink: 0;
}

.testimonial-card .stars {
  color: #fbbf24;
  font-size: 0.9rem;
  margin-bottom: 12px;
}

.testimonial-card .text {
  color: var(--color-text);
  font-size: 0.92rem;
  line-height: 1.7;
  margin-bottom: 16px;
}

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

.testimonial-card .author .avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-muted));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-weight: 700;
  font-size: 0.9rem;
}

.testimonial-card .author .info .name {
  color: var(--color-white);
  font-weight: 600;
  font-size: 0.9rem;
}

.testimonial-card .author .info .role {
  color: var(--color-text-muted);
  font-size: 0.8rem;
}

.carousel-controls {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 28px;
}

.carousel-controls button {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-card);
  color: var(--color-white);
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.carousel-controls button:hover {
  background: rgba(87, 159, 212, 0.2);
  border-color: var(--color-accent);
}

.testimonial-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: 28px;
}

.testimonial-tags span {
  padding: 6px 16px;
  background: rgba(87, 159, 212, 0.1);
  border: 1px solid rgba(87, 159, 212, 0.2);
  border-radius: 20px;
  color: var(--color-accent-light);
  font-size: 0.82rem;
}

/* ========================================
   Comparison Table
   ======================================== */
.comparison-wrapper {
  overflow-x: auto;
}

.comparison-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

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

.comparison-table th {
  background: var(--color-secondary);
  color: var(--color-white);
  font-weight: 600;
  font-size: 0.95rem;
}

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

.comparison-table .highlight {
  background: rgba(87, 159, 212, 0.05);
}

.comparison-table .highlight th,
.comparison-table td.highlight {
  background: rgba(87, 159, 212, 0.08);
}

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

.comparison-table i.fa-check {
  color: #4ade80;
}

.comparison-table i.fa-xmark {
  color: #f87171;
}

/* ========================================
   FAQ
   ======================================== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition);
}

.faq-item:hover {
  border-color: rgba(87, 159, 212, 0.2);
}

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

.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, padding 0.3s ease;
}

.faq-item.active .faq-answer {
  max-height: 400px;
}

.faq-answer-inner {
  padding: 0 24px 20px;
  color: var(--color-text-muted);
  font-size: 0.92rem;
  line-height: 1.8;
}

/* ========================================
   Final CTA
   ======================================== */
.final-cta {
  padding: 80px 0;
  text-align: center;
  position: relative;
  background: linear-gradient(135deg, rgba(87, 159, 212, 0.1) 0%, rgba(95, 119, 166, 0.05) 100%);
}

.final-cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(87, 159, 212, 0.06) 0%, transparent 70%);
}

.final-cta .container {
  position: relative;
}

.final-cta h2 {
  font-size: 2.4rem;
  margin-bottom: 12px;
}

.final-cta p {
  color: var(--color-text-muted);
  font-size: 1.1rem;
  margin-bottom: 32px;
}

/* ========================================
   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-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-white);
  font-weight: 600;
}

.footer-logo img {
  width: 24px;
  height: 24px;
  border-radius: 4px;
}

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

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

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

.footer-bottom {
  text-align: center;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.82rem;
}

/* ========================================
   Back to Top
   ======================================== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-accent);
  color: var(--color-white);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition);
  box-shadow: var(--shadow-md);
  z-index: 900;
}

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

.back-to-top:hover {
  background: var(--color-accent-light);
  transform: translateY(-2px);
}

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

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

.animate-on-scroll:nth-child(2) { transition-delay: 0.1s; }
.animate-on-scroll:nth-child(3) { transition-delay: 0.2s; }
.animate-on-scroll:nth-child(4) { transition-delay: 0.3s; }
.animate-on-scroll:nth-child(5) { transition-delay: 0.4s; }
.animate-on-scroll:nth-child(6) { transition-delay: 0.5s; }

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .usecases-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card:last-child {
    grid-column: 1 / -1;
    max-width: 400px;
    margin: 0 auto;
  }
  .testimonial-card {
    min-width: calc(50% - 12px);
  }
}

@media (max-width: 768px) {
  .nav {
    display: none;
  }
  .lang-switcher {
    display: none;
  }
  .header .btn-cta {
    display: none;
  }
  .menu-toggle {
    display: block;
  }

  .hero {
    padding: 120px 0 60px;
  }
  .hero h1 {
    font-size: 2.2rem;
  }
  .hero .subtitle {
    font-size: 1rem;
  }

  .section {
    padding: 60px 0;
  }
  .section-title h2 {
    font-size: 1.7rem;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }
  .usecases-grid {
    grid-template-columns: 1fr 1fr;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .pricing-card:last-child {
    max-width: none;
  }

  .testimonial-card {
    min-width: calc(100% - 0px);
  }

  .comparison-table th,
  .comparison-table td {
    padding: 12px 14px;
    font-size: 0.82rem;
  }

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

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

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.8rem;
  }
  .usecases-grid {
    grid-template-columns: 1fr;
  }
  .testimonials-header {
    flex-direction: column;
  }
}