/* 빌드 ID: v24-npd20-L24C15 */
/* CSS 접두사: npd20_ */

/* Reset & Base */
* {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --primary: #15803D;
  --bg: #BBF7D0;
  --text: #14532D;
  --accent: #4ADE80;
  --heading: var(--text);
  --link: var(--text);
  --border: #86EFAC;
  --shadow: rgba(21, 128, 61, 0.15);
  --white: #FFFFFF;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard", "Malgun Gothic", sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 1.05rem;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Skip Link */
.npd20_skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background-color: var(--primary);
  color: var(--white);
  padding: 8px 16px;
  z-index: 100;
  -webkit-border-radius: 0 0 4px 0;
  -moz-border-radius: 0 0 4px 0;
  border-radius: 0 0 4px 0;
}

.npd20_skip-link:focus {
  top: 0;
}

/* Header & Navigation (N15 스타일) */
header {
  background-color: var(--white);
  border-bottom: 2px solid var(--border);
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  z-index: 50;
  -webkit-box-shadow: 0 2px 12px var(--shadow);
  -moz-box-shadow: 0 2px 12px var(--shadow);
  box-shadow: 0 2px 12px var(--shadow);
}

.npd20_header-container {
  max-width: 1350px;
  margin: 0 auto;
  padding: 1.2rem 1.5rem;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: justify;
  -ms-flex-pack: justify;
  justify-content: space-between;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  gap: 2rem;
}

.npd20_logo {
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--primary);
  white-space: nowrap;
}

nav ul {
  list-style: none;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  gap: 0.5rem;
  -ms-flex-wrap: wrap;
  flex-wrap: wrap;
}

nav a {
  display: block;
  padding: 0.75rem 1.25rem;
  color: var(--text);
  font-weight: 600;
  -webkit-border-radius: 0;
  -moz-border-radius: 0;
  border-radius: 0;
  -webkit-transition: all 0.2s;
  -o-transition: all 0.2s;
  -moz-transition: all 0.2s;
  transition: all 0.2s;
  font-size: 0.95rem;
  background-color: var(--white);
  border: 2px solid var(--border);
}

nav a:hover,
nav a:focus {
  background-color: var(--accent);
  color: var(--text);
  border-color: var(--primary);
  -webkit-transform: translateY(-2px);
  -ms-transform: translateY(-2px);
  -moz-transform: translateY(-2px);
  transform: translateY(-2px);
}

nav a[aria-current="page"] {
  background-color: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}

/* Main Content */
main {
  min-height: 60vh;
}

.npd20_container {
  max-width: 1350px;
  margin: 0 auto;
  padding: 5.75rem 1.5rem;
}

/* Hero Section (L24 테크 히어로) */
.npd20_hero {
  background: -webkit-linear-gradient(315deg, var(--primary) 0%, var(--accent) 100%);
  background: -o-linear-gradient(315deg, var(--primary) 0%, var(--accent) 100%);
  background: -moz-linear-gradient(315deg, var(--primary) 0%, var(--accent) 100%);
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: var(--text);
  padding: 6rem 1.5rem;
  text-align: center;
  margin-bottom: 5.75rem;
}

.npd20_hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.01em;
  color: var(--white);
  margin-bottom: 1.5rem;
}

.npd20_hero p {
  font-size: 1.2rem;
  max-width: 750px;
  margin: 0 auto 2.5rem;
  color: var(--white);
  opacity: 0.95;
}

/* Buttons (B07 스타일) */
.npd20_btn {
  display: inline-block;
  padding: 1.5rem 3.5rem;
  background-color: var(--white);
  color: var(--primary);
  font-weight: 800;
  -webkit-border-radius: 0;
  -moz-border-radius: 0;
  border-radius: 0;
  -webkit-transition: all 0.3s;
  -o-transition: all 0.3s;
  -moz-transition: all 0.3s;
  transition: all 0.3s;
  border: 3px solid var(--white);
  font-size: 1rem;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.npd20_btn:hover,
.npd20_btn:focus {
  background-color: var(--text);
  color: var(--white);
  border-color: var(--white);
  -webkit-transform: translateY(-3px);
  -ms-transform: translateY(-3px);
  -moz-transform: translateY(-3px);
  transform: translateY(-3px);
  -webkit-box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
  -moz-box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
}

.npd20_btn-secondary {
  background-color: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}

.npd20_btn-secondary:hover,
.npd20_btn-secondary:focus {
  background-color: var(--accent);
  color: var(--text);
  border-color: var(--accent);
}

/* 6열 로고 그리드 (L24 구조) */
.npd20_logo-grid {
  display: -ms-grid;
  display: grid;
  -ms-grid-columns: 1fr 3.75rem 1fr 3.75rem 1fr 3.75rem 1fr 3.75rem 1fr 3.75rem 1fr;
  grid-template-columns: repeat(6, 1fr);
  gap: 3.75rem;
  margin: 5.75rem 0;
  padding: 3rem 0;
}

.npd20_logo-item {
  text-align: center;
  padding: 2rem;
  background-color: var(--white);
  border: 3px solid var(--text);
  -webkit-border-radius: 0;
  -moz-border-radius: 0;
  border-radius: 0;
}

/* Cards (K07 스타일) */
.npd20_card-grid {
  display: -ms-grid;
  display: grid;
  -ms-grid-columns: 1fr 3.75rem 1fr 3.75rem 1fr;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 3.75rem;
  margin: 3.75rem 0;
}

.npd20_card {
  background-color: var(--white);
  padding: 2rem;
  border: 3px solid var(--text);
  -webkit-border-radius: 0;
  -moz-border-radius: 0;
  border-radius: 0;
  -webkit-transition: all 0.3s;
  -o-transition: all 0.3s;
  -moz-transition: all 0.3s;
  transition: all 0.3s;
}

.npd20_card:hover,
.npd20_card:focus-within {
  -webkit-transform: translateY(-4px);
  -ms-transform: translateY(-4px);
  -moz-transform: translateY(-4px);
  transform: translateY(-4px);
  -webkit-box-shadow: 8px 8px 0 var(--primary);
  -moz-box-shadow: 8px 8px 0 var(--primary);
  box-shadow: 8px 8px 0 var(--primary);
}

.npd20_card-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  display: block;
}

.npd20_card h3 {
  color: var(--primary);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

/* Sections (S11 여백) */
.npd20_section {
  padding: 5.75rem 0;
  border-bottom: 2px solid var(--border);
}

.npd20_section:last-child {
  border-bottom: none;
}

.npd20_section-header {
  text-align: center;
  margin-bottom: 3.75rem;
}

.npd20_section-header h2 {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.01em;
  color: var(--primary);
  margin-bottom: 1rem;
}

.npd20_section-header p {
  font-size: 1.15rem;
  color: var(--text);
  max-width: 750px;
  margin: 0 auto;
}

/* 타임라인 구조 (CS07) */
.npd20_timeline {
  position: relative;
  padding: 3rem 0;
}

.npd20_timeline::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 4px;
  background-color: var(--primary);
  -webkit-transform: translateX(-50%);
  -ms-transform: translateX(-50%);
  -moz-transform: translateX(-50%);
  transform: translateX(-50%);
}

.npd20_timeline-item {
  position: relative;
  margin-bottom: 3.75rem;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
}

.npd20_timeline-content {
  background-color: var(--white);
  padding: 2rem;
  border: 3px solid var(--text);
  -webkit-border-radius: 0;
  -moz-border-radius: 0;
  border-radius: 0;
  width: 45%;
  position: relative;
}

.npd20_timeline-marker {
  width: 40px;
  height: 40px;
  background-color: var(--primary);
  border: 4px solid var(--white);
  -webkit-border-radius: 50%;
  -moz-border-radius: 50%;
  border-radius: 50%;
  position: absolute;
  left: 50%;
  -webkit-transform: translateX(-50%);
  -ms-transform: translateX(-50%);
  -moz-transform: translateX(-50%);
  transform: translateX(-50%);
  z-index: 2;
  -webkit-box-shadow: 0 0 0 4px var(--accent);
  -moz-box-shadow: 0 0 0 4px var(--accent);
  box-shadow: 0 0 0 4px var(--accent);
}

.npd20_timeline-time {
  font-weight: 800;
  color: var(--primary);
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}

/* Content Blocks */
.npd20_content-block {
  background-color: var(--white);
  padding: 2.5rem;
  -webkit-border-radius: 0;
  -moz-border-radius: 0;
  border-radius: 0;
  margin-bottom: 3.75rem;
  border-left: 6px solid var(--primary);
  -webkit-box-shadow: 0 2px 12px var(--shadow);
  -moz-box-shadow: 0 2px 12px var(--shadow);
  box-shadow: 0 2px 12px var(--shadow);
}

.npd20_content-block h3 {
  color: var(--primary);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

/* Lists */
.npd20_feature-list {
  list-style: none;
  display: -ms-grid;
  display: grid;
  gap: 2rem;
  margin: 3.75rem 0;
}

.npd20_feature-list li {
  padding: 1.75rem;
  background-color: var(--white);
  -webkit-border-radius: 0;
  -moz-border-radius: 0;
  border-radius: 0;
  border: 3px solid var(--text);
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: start;
  -ms-flex-align: start;
  align-items: flex-start;
  gap: 1rem;
}

.npd20_feature-list li::before {
  content: "✓";
  font-size: 1.5rem;
  color: var(--primary);
  font-weight: bold;
  -ms-flex-negative: 0;
  flex-shrink: 0;
}

/* FAQ */
.npd20_faq-item {
  background-color: var(--white);
  padding: 2rem;
  -webkit-border-radius: 0;
  -moz-border-radius: 0;
  border-radius: 0;
  margin-bottom: 2rem;
  border: 3px solid var(--text);
  -webkit-transition: all 0.3s;
  -o-transition: all 0.3s;
  -moz-transition: all 0.3s;
  transition: all 0.3s;
}

.npd20_faq-item:hover {
  border-color: var(--primary);
  -webkit-box-shadow: 6px 6px 0 var(--accent);
  -moz-box-shadow: 6px 6px 0 var(--accent);
  box-shadow: 6px 6px 0 var(--accent);
}

.npd20_faq-question {
  font-weight: 700;
  color: var(--primary);
  font-size: 1.2rem;
  margin-bottom: 1rem;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  gap: 0.75rem;
}

.npd20_faq-question::before {
  content: "Q";
  background-color: var(--primary);
  color: var(--white);
  width: 32px;
  height: 32px;
  -webkit-border-radius: 0;
  -moz-border-radius: 0;
  border-radius: 0;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
  font-weight: 800;
  -ms-flex-negative: 0;
  flex-shrink: 0;
}

.npd20_faq-answer {
  color: var(--text);
  line-height: 1.7;
}

/* Reviews */
.npd20_review-card {
  background-color: var(--white);
  padding: 2rem;
  -webkit-border-radius: 0;
  -moz-border-radius: 0;
  border-radius: 0;
  border: 3px solid var(--text);
  margin-bottom: 3.75rem;
  -webkit-box-shadow: 0 2px 12px var(--shadow);
  -moz-box-shadow: 0 2px 12px var(--shadow);
  box-shadow: 0 2px 12px var(--shadow);
}

.npd20_review-header {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: justify;
  -ms-flex-pack: justify;
  justify-content: space-between;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  margin-bottom: 1rem;
  -ms-flex-wrap: wrap;
  flex-wrap: wrap;
  gap: 1rem;
}

.npd20_reviewer-name {
  font-weight: 700;
  color: var(--primary);
  font-size: 1.15rem;
}

.npd20_review-rating {
  color: var(--primary);
  font-size: 1.3rem;
  font-weight: 800;
}

.npd20_review-text {
  color: var(--text);
  line-height: 1.7;
}

/* Contact Info */
.npd20_contact-info {
  background-color: var(--white);
  padding: 2.5rem;
  -webkit-border-radius: 0;
  -moz-border-radius: 0;
  border-radius: 0;
  border: 3px solid var(--text);
  margin: 3.75rem 0;
  -webkit-box-shadow: 0 2px 12px var(--shadow);
  -moz-box-shadow: 0 2px 12px var(--shadow);
  box-shadow: 0 2px 12px var(--shadow);
}

.npd20_contact-item {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  gap: 1.5rem;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  background-color: var(--bg);
  -webkit-border-radius: 0;
  -moz-border-radius: 0;
  border-radius: 0;
  border-left: 6px solid var(--primary);
}

.npd20_contact-icon {
  font-size: 2rem;
  color: var(--primary);
}

.npd20_contact-details strong {
  display: block;
  color: var(--primary);
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
  font-weight: 700;
}

.npd20_contact-details a {
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: var(--primary);
  text-underline-offset: 3px;
}

.npd20_contact-details a:hover,
.npd20_contact-details a:focus {
  color: var(--primary);
  text-decoration-thickness: 3px;
}

/* Footer */
footer {
  background-color: var(--primary);
  color: var(--white);
  padding: 4rem 1.5rem 2rem;
  margin-top: 5.75rem;
}

.npd20_footer-content {
  max-width: 1350px;
  margin: 0 auto;
  display: -ms-grid;
  display: grid;
  -ms-grid-columns: 1fr 3rem 1fr 3rem 1fr;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 3rem;
  margin-bottom: 2rem;
}

.npd20_footer-section h3 {
  color: var(--white);
  margin-bottom: 1.5rem;
  font-size: 1.3rem;
  font-weight: 700;
}

.npd20_footer-links {
  list-style: none;
}

.npd20_footer-links li {
  margin-bottom: 0.8rem;
}

.npd20_footer-links a {
  color: rgba(255, 255, 255, 0.9);
  -webkit-transition: all 0.2s;
  -o-transition: all 0.2s;
  -moz-transition: all 0.2s;
  transition: all 0.2s;
  display: inline-block;
}

.npd20_footer-links a:hover,
.npd20_footer-links a:focus {
  color: var(--accent);
  -webkit-transform: translateX(6px);
  -ms-transform: translateX(6px);
  -moz-transform: translateX(6px);
  transform: translateX(6px);
}

.npd20_footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 2px solid rgba(255, 255, 255, 0.3);
  color: rgba(255, 255, 255, 0.9);
}

/* Legal Pages */
.npd20_legal-content {
  max-width: 950px;
  margin: 0 auto;
  background-color: var(--white);
  padding: 3rem;
  -webkit-border-radius: 0;
  -moz-border-radius: 0;
  border-radius: 0;
  -webkit-box-shadow: 0 2px 12px var(--shadow);
  -moz-box-shadow: 0 2px 12px var(--shadow);
  box-shadow: 0 2px 12px var(--shadow);
  border: 3px solid var(--text);
}

.npd20_legal-content h2 {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-top: 2rem;
  border-top: 3px solid var(--border);
}

.npd20_legal-content h2:first-of-type {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.npd20_legal-content ul,
.npd20_legal-content ol {
  margin-left: 2rem;
  margin-bottom: 1.5rem;
}

.npd20_legal-content li {
  margin-bottom: 0.8rem;
  line-height: 1.7;
}

/* Responsive */
@media (max-width: 768px) {
  .npd20_header-container {
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -ms-flex-direction: column;
    flex-direction: column;
    gap: 1.5rem;
  }

  nav ul {
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
  }

  .npd20_hero {
    padding: 4rem 1.5rem;
  }

  .npd20_hero h1 {
    font-size: 2rem;
  }

  .npd20_logo-grid {
    -ms-grid-columns: 1fr 2rem 1fr 2rem 1fr;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }

  .npd20_card-grid {
    -ms-grid-columns: 1fr;
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .npd20_timeline::before {
    left: 20px;
  }

  .npd20_timeline-content {
    width: calc(100% - 60px);
    margin-left: 60px;
  }

  .npd20_timeline-marker {
    left: 20px;
  }

  .npd20_footer-content {
    -ms-grid-columns: 1fr;
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .npd20_legal-content {
    padding: 2rem 1.5rem;
  }

  .npd20_btn {
    padding: 1.25rem 2.5rem;
    font-size: 0.9rem;
  }
}

@media (max-width: 480px) {
  .npd20_logo-grid {
    -ms-grid-columns: 1fr 1.5rem 1fr;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
}

/* Focus Styles */
*:focus {
  outline: 3px solid var(--primary);
  outline-offset: 3px;
}

button:focus,
a:focus {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

/* Accessibility */
.npd20_sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}