/* ========================================
   FEATURES SECTION - 특징 섹션
   ======================================== */

.features {
  padding: var(--space-24) 0;
  background: linear-gradient(135deg, var(--color-primary-50) 0%, var(--color-primary-100) 100%);
  position: relative;
}

.features::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="%23ffffff" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
  opacity: 0.5;
  pointer-events: none;
}

.features__container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  position: relative;
  z-index: 2;
}

.features__header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.features__title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  color: #0F172A;
  margin-bottom: var(--space-4);
  line-height: 1.2;
  letter-spacing: -0.02em;
  text-shadow: 0 2px 4px rgba(15, 23, 42, 0.15);
}

.features__subtitle {
  font-size: var(--font-size-xl);
  color: #475569;
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
  font-weight: var(--font-weight-medium);
  text-shadow: 0 1px 2px rgba(71, 85, 105, 0.1);
}

/* ========================================
   FEATURES SCROLL CONTAINER - 스크롤 컨테이너
   ======================================== */

.features__scroll-container {
  margin-top: var(--space-12);
  padding-bottom: var(--space-4);
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  position: relative;
}

.features__scroll-container::-webkit-scrollbar {
  display: none;
}

.features__scroll-container:active {
  cursor: grabbing;
}

.features__scroll-container * {
  user-select: none;
}

.features__scroll-container .feature-card {
  cursor: grab;
}

.features__scroll-container.can-scroll::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 60px;
  background: linear-gradient(90deg, transparent 0%, var(--color-primary-50) 100%);
  pointer-events: none;
  z-index: 1;
}

/* ========================================
   FEATURES GRID - 특징 그리드
   ======================================== */

.features__grid {
  display: flex;
  gap: var(--space-6);
  padding: var(--space-2) 0;
  min-width: max-content;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
}

/* ========================================
   FEATURE CARD - 특징 카드
   ======================================== */

.feature-card {
  background: white;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--border-radius-2xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-duration-300) var(--transition-timing-function-ease);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 320px;
  min-width: 280px;
  max-width: 320px;
  flex-shrink: 0;
  scroll-snap-align: start;
  -webkit-scroll-snap-align: start;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-accent) 100%);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.1), 0 3px 12px rgba(29, 136, 177, 0.1);
  border-color: rgba(29, 136, 177, 0.2);
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-card__icon {
  width: 2.5rem;
  height: 2.5rem;
  background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-dark) 100%);
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-3);
  color: #ffffff;
  font-size: var(--font-size-lg);
  box-shadow: 0 3px 8px rgba(29, 136, 177, 0.3);
  transition: transform 0.3s ease;
  flex-shrink: 0;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.feature-card:hover .feature-card__icon {
  transform: scale(1.1);
}

.feature-card__title {
  font-size: 1rem; /* 16px - SEO 최적 크기 */
  font-weight: var(--font-weight-bold);
  color: var(--brand-primary);
  margin-bottom: var(--space-2);
  text-align: center;
  line-height: 1.3;
  flex-shrink: 0;
  padding: 0 var(--space-2);
}

.feature-card__title .keyword-emphasis {
  color: var(--brand-primary);
  font-weight: var(--font-weight-extrabold);
  position: relative;
  display: inline-block;
  padding: 0 2px;
  transition: all 0.2s ease;
}

.feature-card:hover .feature-card__title .keyword-emphasis {
  animation: keyword-glow 2s ease-in-out infinite;
  transform: scale(1.02);
}

.feature-card__title .keyword-emphasis::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(29, 136, 177, 0.1) 0%, rgba(29, 136, 177, 0.05) 100%);
  border-radius: var(--border-radius-sm);
  z-index: -1;
  transform: scaleX(0);
  transition: transform 0.2s ease;
}

.feature-card:hover .feature-card__title .keyword-emphasis::before {
  transform: scaleX(1);
}

.feature-card__description {
  color: #475569;
  line-height: 1.4;
  margin-bottom: var(--space-3);
  font-weight: var(--font-weight-normal);
  font-size: 0.875rem; /* 14px - SEO 최적 크기 */
  text-align: center;
  flex-shrink: 0;
  padding: 0 var(--space-2);
}

.feature-card__features {
  list-style: none;
  margin: 0;
  padding: 0 var(--space-2);
  margin-bottom: var(--space-3);
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
}

.feature-card__feature {
  display: flex;
  align-items: flex-start;
  gap: var(--space-1);
  margin-bottom: var(--space-1);
  font-size: 0.875rem; /* 14px - SEO 최적 크기 */
  color: #64748B;
  font-weight: var(--font-weight-medium);
  line-height: 1.3;
  text-align: left;
  padding: 0;
}

.feature-card__feature-icon {
  width: 0.875rem;
  height: 0.875rem;
  fill: var(--color-success-500);
  flex-shrink: 0;
  margin-top: 2px;
}

.feature-card__cta {
  margin-top: auto;
  flex-shrink: 0;
  text-align: center;
  padding: 0 var(--space-2);
}

/* ========================================
   RESPONSIVE DESIGN - 반응형 디자인
   ======================================== */

/* 데스크톱 최적화 (769px 이상) */
@media (min-width: 769px) {
  .features {
    padding: var(--space-20) 0;
  }
  
  .features__title {
    font-size: var(--font-size-3xl);
  }
  
  .features__subtitle {
    font-size: var(--font-size-lg);
  }
  
  .features__scroll-container {
    margin-top: var(--space-16);
  }
  
  .features__grid {
    gap: var(--space-8);
  }
  
  .feature-card {
    padding: var(--space-8);
    min-height: 360px;
    min-width: 320px;
    max-width: 360px;
  }
  
  .feature-card__icon {
    width: 3rem;
    height: 3rem;
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-4);
  }
  
  .feature-card__title {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-3);
  }
  
  .feature-card__description {
    font-size: var(--font-size-base);
    margin-bottom: var(--space-4);
  }
  
  .feature-card__feature {
    font-size: var(--font-size-base);
    margin-bottom: var(--space-2);
  }
  
  .feature-card__feature-icon {
    width: 1rem;
    height: 1rem;
  }
}

/* 태블릿 (768px 이하) */
@media (max-width: 768px) {
  .features__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
  }
  
  .features {
    padding: var(--space-12) 0;
  }
  
  .features__title {
    font-size: var(--font-size-xl);
  }
  
  .features__subtitle {
    font-size: var(--font-size-sm);
  }
  
  .feature-item {
    padding: var(--space-3);
  }
  
  .feature-item__icon {
    width: 2.5rem;
    height: 2.5rem;
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-2);
  }
  
  .feature-item__title {
    font-size: var(--font-size-xs);
    margin-bottom: var(--space-1);
  }
  
  .feature-item__description {
    font-size: 0.75rem; /* 12px - SEO 최소 크기 */
    line-height: 1.4;
  }
}

/* 모바일 (480px 이하) */
@media (max-width: 480px) {
  .features__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-2);
  }
  
  .features {
    padding: var(--space-10) 0;
  }
  
  .features__title {
    font-size: 1.25rem; /* 20px - SEO 최적 크기 */
  }
  
  .features__subtitle {
    font-size: 0.875rem; /* 14px - SEO 최적 크기 */
  }
  
  .feature-item {
    padding: var(--space-3);
  }
  
  .feature-item__icon {
    width: 2.5rem;
    height: 2.5rem;
    font-size: 1.25rem; /* 20px - 아이콘 크기 증가 */
    margin-bottom: var(--space-2);
  }
  
  .feature-item__title {
    font-size: 0.75rem; /* 12px - SEO 최소 크기 */
    margin-bottom: var(--space-0-5);
    line-height: 1.3;
  }
  
  .feature-item__description {
    font-size: 0.75rem; /* 12px - SEO 최소 크기 */
    line-height: 1.4;
  }
}

/* ========================================
   ANIMATIONS - 애니메이션
   ======================================== */

@keyframes keyword-glow {
  0%, 100% {
    box-shadow: 0 0 5px rgba(29, 136, 177, 0.3);
  }
  50% {
    box-shadow: 0 0 15px rgba(29, 136, 177, 0.6);
  }
}