/* ========================================
   ChaChahome - Landing Page Styles
   ======================================== */

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

:root {
  --color-primary: #6366F1;
  --color-primary-dark: #4F46E5;
  --color-primary-light: #818CF8;
  --color-secondary: #8B5CF6;
  --color-bg: #FAFAFA;
  --color-surface: #FFFFFF;
  --color-text: #111827;
  --color-text-secondary: #6B7280;
  --color-text-tertiary: #9CA3AF;
  --color-border: #E5E7EB;
  --color-border-light: #F3F4F6;
  --font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);
  --transition: 0.2s ease;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

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

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

.desktop-only {
  display: none;
}

@media (min-width: 768px) {
  .desktop-only {
    display: inline;
  }
}

/* --- Components: Badge --- */
.badge {
  display: inline-block;
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.15);
  border-radius: 100px;
  letter-spacing: -0.01em;
}

/* --- Components: Button --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-family);
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  text-decoration: none;
}

.btn-sm {
  padding: 8px 20px;
  font-size: 14px;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 15px;
  border-radius: var(--radius-md);
}

.btn-primary {
  color: #fff;
  background: var(--color-primary);
  box-shadow: 0 1px 2px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.35);
  transform: translateY(-1px);
}

.btn-outline {
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-text-tertiary);
  background: var(--color-border-light);
}

.btn-white {
  color: var(--color-primary);
  background: #fff;
  box-shadow: var(--shadow-md);
}

.btn-white:hover {
  background: #F5F3FF;
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

/* --- Text Gradient --- */
.text-gradient {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --- Navbar --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(250, 250, 250, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  transition: box-shadow var(--transition);
}

.navbar.scrolled {
  box-shadow: var(--shadow-sm);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  flex-shrink: 0;
}

.logo-text {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.nav-links {
  display: none;
  gap: 8px;
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }
}

.nav-link {
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.nav-link:hover {
  color: var(--color-text);
  background: var(--color-border-light);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* --- Mobile Menu Button --- */
.mobile-menu-btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  background: none;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.mobile-menu-btn:hover {
  background: var(--color-border-light);
}

@media (min-width: 768px) {
  .mobile-menu-btn {
    display: none;
  }
}

.mobile-menu-btn span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.mobile-menu-btn.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- Mobile Nav --- */
.nav-links.mobile-open {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: 64px;
  left: 0;
  right: 0;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 12px 24px 20px;
  box-shadow: var(--shadow-lg);
  animation: slideDown 0.2s ease;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.nav-links.mobile-open .nav-link {
  padding: 12px 16px;
  font-size: 15px;
}

/* --- Hero --- */
.hero {
  position: relative;
  padding: 120px 0 80px;
  overflow: hidden;
}

@media (min-width: 768px) {
  .hero {
    padding: 160px 0 100px;
  }
}

.hero-content {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
}

.hero-title {
  margin-top: 20px;
  font-size: 40px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--color-text);
}

@media (min-width: 768px) {
  .hero-title {
    font-size: 56px;
  }
}

.hero-desc {
  margin-top: 20px;
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

@media (min-width: 768px) {
  .hero-desc {
    font-size: 18px;
  }
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 36px;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  margin-top: 56px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

@media (min-width: 768px) {
  .hero-stats {
    gap: 40px;
  }
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.stat-number {
  font-size: 24px;
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

@media (min-width: 768px) {
  .stat-number {
    font-size: 28px;
  }
}

.stat-label {
  font-size: 13px;
  color: var(--color-text-tertiary);
  font-weight: 500;
}

.stat-divider {
  width: 1px;
  height: 32px;
  background: var(--color-border);
}

.hero-bg-glow {
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(ellipse, rgba(99, 102, 241, 0.08) 0%, transparent 70%);
  pointer-events: none;
  z-index: -1;
}

/* --- Section Shared --- */
.section-header {
  text-align: center;
  max-width: 560px;
  margin: 0 auto 56px;
}

.section-title {
  margin-top: 16px;
  font-size: 32px;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

@media (min-width: 768px) {
  .section-title {
    font-size: 40px;
  }
}

.section-desc {
  margin-top: 12px;
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* --- Features --- */
.features {
  padding: 80px 0;
}

@media (min-width: 768px) {
  .features {
    padding: 100px 0;
  }
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 640px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature-card {
  padding: 28px;
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  transition: all 0.3s ease;
}

.feature-card:hover {
  border-color: var(--color-border);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.feature-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  color: var(--icon-color, var(--color-primary));
  background: var(--icon-bg, rgba(99,102,241,0.1));
}

.feature-title {
  margin-top: 18px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.feature-desc {
  margin-top: 8px;
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

/* --- Stats Section --- */
.stats-section {
  padding: 80px 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
}

@media (min-width: 768px) {
  .stats-section {
    padding: 100px 0;
  }
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
}

@media (min-width: 768px) {
  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 64px;
  }
}

.stats-content .section-title {
  text-align: left;
}

.stats-content .section-desc {
  text-align: left;
}

.stats-numbers {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.stat-card {
  padding: 28px 24px;
  background: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: all 0.3s ease;
}

.stat-card:hover {
  border-color: rgba(99, 102, 241, 0.2);
  box-shadow: var(--shadow-md);
}

.stat-card-number {
  display: block;
  font-size: 28px;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

@media (min-width: 768px) {
  .stat-card-number {
    font-size: 32px;
  }
}

.stat-card-label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-secondary);
}

/* --- Testimonials --- */
.testimonials {
  padding: 80px 0;
}

@media (min-width: 768px) {
  .testimonials {
    padding: 100px 0;
  }
}

.testimonials-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 768px) {
  .testimonials-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.testimonial-card {
  padding: 28px;
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  transition: all 0.3s ease;
}

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

.testimonial-stars {
  display: flex;
  gap: 2px;
  margin-bottom: 16px;
}

.testimonial-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

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

.testimonial-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  flex-shrink: 0;
}

.testimonial-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.testimonial-role {
  font-size: 13px;
  color: var(--color-text-tertiary);
}

/* --- CTA --- */
.cta {
  padding: 0 0 80px;
}

@media (min-width: 768px) {
  .cta {
    padding: 0 0 100px;
  }
}

.cta-card {
  padding: 56px 32px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border-radius: var(--radius-xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}

@media (min-width: 768px) {
  .cta-card {
    padding: 72px 48px;
  }
}

.cta-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
  pointer-events: none;
}

.cta-title {
  font-size: 28px;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.02em;
}

@media (min-width: 768px) {
  .cta-title {
    font-size: 36px;
  }
}

.cta-desc {
  margin-top: 12px;
  font-size: 15px;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.6;
}

@media (min-width: 768px) {
  .cta-desc {
    font-size: 16px;
  }
}

.cta-actions {
  margin-top: 32px;
}

/* --- Footer --- */
.footer {
  padding: 48px 0 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border-light);
}

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

@media (min-width: 768px) {
  .footer-inner {
    grid-template-columns: 1.5fr 2fr;
  }
}

.footer-tagline {
  margin-top: 12px;
  font-size: 14px;
  color: var(--color-text-tertiary);
}

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

.footer-heading {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link {
  font-size: 14px;
  color: var(--color-text-secondary);
  transition: color var(--transition);
}

.footer-link:hover {
  color: var(--color-primary);
}

.footer-bottom {
  padding: 20px 0;
  border-top: 1px solid var(--color-border-light);
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: var(--color-text-tertiary);
}