:root {
  /* Modern Monochrome Design System */
  --primary-gradient: linear-gradient(135deg, #0f0f0f 0%, #383838 100%);
  --secondary-gradient: linear-gradient(135deg, #2b2b2b 0%, #525252 100%);
  --accent-gradient: linear-gradient(135deg, #404040 0%, #666666 100%);
  --light-gradient: linear-gradient(135deg, #f8f8f8 0%, #f5f5f5 100%);
  --glass-gradient: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.05) 100%);
  
  /* Text Colors */
  --text-primary: #0f0f0f;
  --text-secondary: #2b2b2b;
  --text-muted: #4a4a4a;
  --text-light: #707070;
  --text-white: #ffffff;
  
  /* Background Colors */
  --bg-white: #ffffff;
  --bg-light: #f8f8f8;
  --bg-medium: #f0f0f0;
  --bg-dark: #1a1a1a;
  
  /* Shadows - Modern Layered System */
  --shadow-xs: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-md: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 20px 25px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 25px 50px rgba(0, 0, 0, 0.2);
  
  /* Border Radius System */
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  /* Spacing System */
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 32px;
  --space-xl: 48px;
  --space-2xl: 64px;
  
  /* Typography Scale - 18% 증가 기준 (home.css와 통일) */
  --text-xs: 0.885rem;    /* 0.75rem * 1.18 */
  --text-sm: 1.5rem;    /* 0.875rem * 1.18 */
  --text-base: 1.4rem;   /* 1rem * 1.18 */
  --text-lg: 1.8rem;    /* 1.125rem * 1.18 */
  --text-xl: 2rem;    /* 1.25rem * 1.18 */
  --text-2xl: 2rem;    /* 1.5rem * 1.18 */
  --text-3xl: 2.213rem;   /* 1.875rem * 1.18 */
  --text-4xl: 2.655rem;   /* 2.25rem * 1.18 */
  --text-5xl: 3.54rem;    /* 3rem * 1.18 */
  
  /* Font Weight Scale */
  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;
  
  /* Transitions */
  --transition-fast: all 0.15s ease;
  --transition-normal: all 0.25s ease;
  --transition-slow: all 0.4s ease;
}

/* Base Styles */
.solution-section {
  background: var(--primary-gradient);
  min-height: 80px;
  display: flex;
  align-items: center;
}

.solution-detail-container {
  max-width: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
}

/* Hero Section - Modern Glass Morphism */
.solution-hero {
  position: relative;
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-gradient);
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  color: var(--text-white);
  overflow: hidden;
}

.solution-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 20% 50%, rgba(120, 120, 120, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(120, 120, 120, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 40% 80%, rgba(120, 120, 120, 0.1) 0%, transparent 50%);
  animation: heroGlow 20s ease-in-out infinite;
}

@keyframes heroGlow {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.6; }
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(1px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
}

.hero-content {
  text-align: center;
  max-width: 900px;
  padding: 0 var(--space-md);
  z-index: 3;
}

.solution-name {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  margin-bottom: var(--space-sm);
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  color: var(--text-white);
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.solution-subtitle {
  font-size: var(--text-xl);
  margin-bottom: var(--space-lg);
  opacity: 0.9;
  color: var(--text-white);
  font-weight: 400;
}

.solution-category {
  display: inline-block;
  font-size: var(--text-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  background: var(--glass-gradient);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: var(--shadow-md);
}

/* Section Base Styles */
.solution-description-section,
.solution-tags-section,
.main-features-section,
.architecture-section,
.characteristics-section,
.benefits-section,
.contact-section {
  padding: var(--space-lg) 0;
}

.solution-description-section {
  background: var(--bg-light);
}

.solution-description {
  font-size: var(--text-lg);
  line-height: 1.8;
  color: var(--text-muted);
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  font-weight: 400;
}

/* Tags Section */
.solution-tags-section {
  background: var(--bg-white);
  text-align: center;
}

.solution-tags {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
}

.solution-tag {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  background: var(--light-gradient);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  font-weight: 600;
  border: 1px solid rgba(0, 0, 0, 0.08);
  transition: var(--transition-fast);
  box-shadow: var(--shadow-xs);
}

.solution-tag:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
  background: var(--bg-white);
}

/* Modern Section Titles */
.section-title {
  text-align: center;
  font-size: clamp(2rem, 4vw, 2.5rem);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: var(--space-2xl);
  position: relative;
  letter-spacing: -0.02em;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: calc(-1 * var(--space-sm));
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: var(--primary-gradient);
  border-radius: var(--radius-full);
}

/* Unified Card System */
.card-base {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
  border: 1px solid rgba(0, 0, 0, 0.06);
  overflow: hidden;
  position: relative;
}

.card-base::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--primary-gradient);
  opacity: 0;
  transition: var(--transition-normal);
}

.card-base:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0, 0, 0, 0.1);
}

.card-base:hover::before {
  opacity: 1;
}

/* Unified Grid System for Features, Characteristics, Benefits */
.content-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

/* Unified Content Card */
.content-card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
  border: 1px solid rgba(0, 0, 0, 0.06);
  overflow: hidden;
  position: relative;
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
}

.content-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--primary-gradient);
  opacity: 0;
  transition: var(--transition-normal);
}

.content-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0, 0, 0, 0.1);
}

.content-card:hover::before {
  opacity: 1;
}

/* Card Icon System - 제거됨 - 아이콘 없는 디자인 */

/* Card Text System */
.content-title {
  font-size: var(--text-4xl);
  font-weight: var(--font-extrabold);
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
  letter-spacing: -0.02em;
  line-height: 1.3;
  position: relative;
  padding-bottom: var(--space-sm);
}

.content-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 2px;
  background: var(--primary-gradient);
  border-radius: var(--radius-full);
}

.content-description {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: 1.8;
  font-weight: var(--font-normal);
  max-width: 90%;
  margin: 0 auto;
}

/* Legacy class support - Direct styling for browser compatibility */
.features-grid,
.characteristics-grid,
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

.feature-item,
.characteristic-item,
.benefit-item {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal);
  border: 1px solid rgba(0, 0, 0, 0.06);
  overflow: hidden;
  position: relative;
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
}

.feature-item::before,
.characteristic-item::before,
.benefit-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--primary-gradient);
  opacity: 0;
  transition: var(--transition-normal);
}

.feature-item:hover,
.characteristic-item:hover,
.benefit-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(0, 0, 0, 0.1);
}

.feature-item:hover::before,
.characteristic-item:hover::before,
.benefit-item:hover::before {
  opacity: 1;
}

/* Feature/Characteristic/Benefit Icon System - 제거됨 - 아이콘 없는 디자인 */

.feature-title,
.characteristic-title,
.benefit-title {
  font-size: var(--text-2xl);
  font-weight: var(--font-extrabold);
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
  letter-spacing: -0.02em;
  line-height: 1.3;
  position: relative;
  padding-bottom: var(--space-sm);
}

.feature-title::after,
.characteristic-title::after,
.benefit-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 2px;
  background: var(--primary-gradient);
  border-radius: var(--radius-full);
}

.feature-description,
.characteristic-description,
.benefit-description {
  font-size: var(--text-lg);
  color: var(--text-muted);
  line-height: 1.8;
  font-weight: var(--font-normal);
  max-width: 90%;
  margin: 0 auto;
}

/* Architecture Section - Enhanced Slider */
.architecture-section {
  background: var(--bg-light);
}

.architecture-slider-container {
  margin-top: var(--space-xl);
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

/* 메인 슬라이더 */
.architecture-slider {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: var(--bg-white);
}

.slider-wrapper {
  position: relative;
  width: 100%;
  overflow: hidden;
}

.slide {
  display: none;
  position: relative;
  opacity: 0;
  transform: translateX(30px);
  transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.slide.active {
  display: block;
  opacity: 1;
  transform: translateX(0);
}

.slide-content {
  position: relative;
}

.architecture-image {
  width: 100%;
  height: auto;
  max-height: 600px;
  object-fit: contain;
  display: block;
  background: var(--bg-white);
}

/* 슬라이드 정보 스타일 제거됨 - 깔끔한 이미지만 표시 */

/* 네비게이션 버튼 */
.slider-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(0, 0, 0, 0.7);
  color: var(--text-white);
  border: none;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-normal);
  z-index: 10;
  backdrop-filter: blur(10px);
}

.slider-nav:hover {
  background: rgba(0, 0, 0, 0.9);
  transform: translateY(-50%) scale(1.1);
}

.slider-nav:active {
  transform: translateY(-50%) scale(0.95);
}

.slider-prev {
  left: var(--space-md);
}

.slider-next {
  right: var(--space-md);
}

.slider-nav i {
  font-size: var(--text-lg);
}

/* 썸네일 네비게이션 */
.thumbnail-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow-x: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(0, 0, 0, 0.2) transparent;
  max-width: fit-content;
  margin-left: auto;
  margin-right: auto;
}

.thumbnail-nav::-webkit-scrollbar {
  height: 4px;
}

.thumbnail-nav::-webkit-scrollbar-track {
  background: transparent;
}

.thumbnail-nav::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.2);
  border-radius: 2px;
}

.thumbnail {
  flex-shrink: 0;
  background: none;
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition-normal);
  overflow: hidden;
  width: 80px;
  text-align: center;
  padding: 4px;
}

.thumbnail.active {
  border-color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.thumbnail:hover {
  border-color: rgba(0, 0, 0, 0.3);
  transform: translateY(-2px);
}

.thumbnail img {
  width: 100%;
  height: 40px;
  object-fit: cover;
  border-radius: 4px;
}

/* 진행 상황 표시 */
.slider-progress {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  max-width: 300px;
  margin-left: auto;
  margin-right: auto;
}

.progress-bar {
  flex: 1;
  height: 4px;
  background: rgba(0, 0, 0, 0.1);
  border-radius: 2px;
  overflow: hidden;
  margin-right: var(--space-md);
}

.progress-fill {
  height: 100%;
  background: var(--primary-gradient);
  transition: width 0.5s ease;
  border-radius: 2px;
}

.slide-counter {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-muted);
  white-space: nowrap;
}

.current-slide {
  color: var(--text-primary);
  font-weight: var(--font-bold);
}

/* 키보드 접근성 */
.slider-nav:focus,
.thumbnail:focus {
  outline: 2px solid var(--text-primary);
  outline-offset: 2px;
}

/* 로딩 상태 */
.architecture-image {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
}

.architecture-image[src] {
  animation: none;
  background: transparent;
}

@keyframes loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* 전체화면 모드 지원 */
.architecture-slider.fullscreen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 9999;
  background: rgba(0, 0, 0, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
}

.fullscreen .architecture-image {
  max-height: 90vh;
  max-width: 90vw;
}

/* 반응형 디자인 */
@media (max-width: 768px) {
  .architecture-slider-container {
    margin-top: var(--space-lg);
  }
  
  .slider-nav {
    width: 40px;
    height: 40px;
  }
  
  .slider-prev {
    left: var(--space-sm);
  }
  
  .slider-next {
    right: var(--space-sm);
  }
  
  .slide-info {
    padding: var(--space-lg) var(--space-md) var(--space-sm);
  }
  
  .slide-title {
    font-size: var(--text-lg);
  }
  
  .slide-description {
    font-size: var(--text-sm);
  }
  
  .thumbnail {
    width: 90px;
  }
  
  .thumbnail img {
    height: 45px;
  }
  
  .thumbnail-title {
    font-size: 10px;
  }
}

@media (max-width: 480px) {
  .thumbnail-nav {
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-sm);
    margin-top: var(--space-sm);
    max-width: 100%;
    justify-content: flex-start;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  
  .thumbnail {
    width: 80px;
    padding: 4px;
    flex-shrink: 0;
  }
  
  .thumbnail img {
    height: 40px;
  }
  
  .slider-progress {
    margin-top: var(--space-sm);
    max-width: 250px;
  }
  
  .slide-info {
    position: static;
    background: var(--bg-white);
    color: var(--text-primary);
    transform: none;
    padding: var(--space-md);
  }
  
  .slide-title {
    color: var(--text-primary);
  }
  
  .slide-description {
    color: var(--text-muted);
  }
}


/* Contact Section - Clean White Design */
.contact-section {
  background: var(--bg-white);
  color: var(--text-primary);
  text-align: center;
  position: relative;
  border-top: 1px solid rgba(0, 0, 0, 0.08);
}

.contact-content {
  position: relative;
  z-index: 2;
}

.contact-content h2 {
  font-size: clamp(2rem, 4vw, 2.5rem);
  font-weight: var(--font-extrabold);
  margin-bottom: var(--space-md);
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.contact-content p {
  font-size: var(--text-lg);
  margin-bottom: var(--space-xl);
  color: var(--text-muted);
  font-weight: var(--font-normal);
}

.contact-actions {
  margin-bottom: var(--space-xl);
}

.btn-contact {
  display: inline-block;
  background: var(--primary-gradient);
  color: var(--text-white);
  text-decoration: none;
  padding: var(--space-md) var(--space-2xl);
  border-radius: var(--radius-full);
  font-weight: var(--font-bold);
  font-size: var(--text-lg);
  transition: var(--transition-normal);
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
  border: 2px solid transparent;
}

.btn-contact::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.1) 50%, transparent 100%);
  transition: var(--transition-slow);
}

.btn-contact:hover {
  color: var(--text-white);
  text-decoration: none;
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  background: var(--secondary-gradient);
}

.btn-contact:hover::before {
  left: 100%;
}

.contact-info-section {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  flex-wrap: wrap;
  position: relative;
  z-index: 2;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-base);
  color: var(--text-muted);
  font-weight: var(--font-medium);
}

.contact-item i {
  font-size: var(--text-lg);
  color: var(--text-light);
}

/* Back to Solutions */
.back-to-solutions {
  background: var(--bg-light);
  padding: var(--space-xl) 0;
  text-align: center;
}

.btn-back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 600;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  transition: var(--transition-normal);
  background: var(--bg-white);
  box-shadow: var(--shadow-sm);
}

.btn-back:hover {
  color: var(--text-primary);
  text-decoration: none;
  background: var(--bg-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .features-grid,
  .characteristics-grid,
  .benefits-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-md);
  }
}

@media (max-width: 768px) {
  .solution-hero {
    background-attachment: scroll;
    min-height: 50vh;
  }
  
  .hero-content {
    padding: 0 var(--space-sm);
  }
  
  .section-title {
    margin-bottom: var(--space-lg);
  }
  
  .features-grid,
  .characteristics-grid,
  .benefits-grid {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }
  
  .contact-info {
    flex-direction: column;
    gap: var(--space-md);
  }
  
  .solution-description-section,
  .solution-tags-section,
  .main-features-section,
  .architecture-section,
  .characteristics-section,
  .benefits-section,
  .contact-section {
    padding: var(--space-xl) 0;
  }
}

@media (max-width: 480px) {
  .feature-item,
  .benefit-item {
    padding: var(--space-lg) var(--space-md);
  }
  
  .characteristic-item {
    padding: var(--space-md);
  }
  
  .solution-tags {
    gap: var(--space-xs);
  }
}

/* Enhanced Focus States for Accessibility */
.btn-contact:focus,
.btn-back:focus {
  outline: 2px solid var(--text-primary);
  outline-offset: 2px;
}

/* Print Styles */
@media print {
  .solution-hero,
  .contact-section {
    background: var(--bg-white) !important;
    color: var(--text-primary) !important;
  }
  
  .card-base {
    box-shadow: none !important;
    border: 1px solid var(--text-light) !important;
  }
}