/* 밀도 계산기 CSS - 네오브루탈리즘 디자인 + 다크모드 */

/* 🌞 라이트 모드 (기본) CSS 변수 */
.density-calculator-container {
  /* 배경색 */
  --bg-primary: #f5f5f0;
  --bg-secondary: #fff;
  --bg-section: #fff;
  
  /* 테두리 */
  --border-color: #333;
  
  /* 텍스트 */
  --text-primary: #222;
  --text-secondary: #555;
  --text-light: #666;
  
  /* 브랜드 색상 */
  --color-accent: #3498db;
  --color-success: #27ae60;
  --color-warning: #f39c12;
  --color-danger: #e74c3c;
  --color-purple: #9b59b6;
  --color-teal: #1abc9c;
  
  /* 그림자 (네오브루탈리즘) */
  --shadow-sm: 2px 2px 0 rgba(0,0,0,0.1);
  --shadow-md: 4px 4px 0 rgba(0,0,0,0.15);
  --shadow-lg: 8px 8px 0 rgba(0,0,0,0.15);
  
  /* 입력 포커스 */
  --input-focus-bg: #fffacd;
  
  /* 헤더 타이틀 */
  --title-color: #2c3e50;
  --title-shadow: 2px 2px 0 rgba(255,255,255,0.5);
  
  /* 버튼 호버 배경 */
  --btn-hover-overlay: rgba(0,0,0,0.1);
  
  /* 간격 */
  --spacing-xs: 4px;
  --spacing-sm: 6px;
  --spacing-md: 8px;
  --spacing-lg: 10px;
  
  /* 폰트 */
  --font-size-base: 14px;
  --font-size-small: 13px;
  --font-size-large: 17px;
  --font-size-title: 24px;
  
  /* 레이아웃 */
  --max-width: 1000px;
  --border-radius: 0;
  --border-width: 1.5px;
  --border-width-thin: 1px;
}

/* 🌙 수동 다크 모드 */
.density-calculator-container.dark {
  /* 배경색 - 다크 그레이 톤 */
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --bg-section: #2d2d2d;
  
  /* 테두리 - 밝은 그레이로 대비 */
  --border-color: #e0e0e0;
  
  /* 텍스트 - 밝은 색상으로 가독성 확보 */
  --text-primary: #e8e8e8;
  --text-secondary: #b0b0b0;
  --text-light: #909090;
  
  /* 브랜드 색상 - 다크 배경에서 더 밝게 조정 */
  --color-accent: #5dade2;
  --color-success: #52c77a;
  --color-warning: #f5b041;
  --color-danger: #ec7063;
  --color-purple: #af7ac5;
  --color-teal: #48d1cc;
  
  /* 그림자 - 밝은 색으로 변경 (네오브루탈리즘) */
  --shadow-sm: 2px 2px 0 rgba(255,255,255,0.08);
  --shadow-md: 4px 4px 0 rgba(255,255,255,0.12);
  --shadow-lg: 8px 8px 0 rgba(255,255,255,0.12);
  
  /* 입력 포커스 - 약간 밝은 다크 그레이 */
  --input-focus-bg: #3a3a3a;
  
  /* 헤더 타이틀 - 밝은 파란색 계열 */
  --title-color: #7fb3d5;
  --title-shadow: 2px 2px 0 rgba(0,0,0,0.5);
  
  /* 버튼 호버 배경 */
  --btn-hover-overlay: rgba(255,255,255,0.1);
}

/* 🌙 시스템 다크모드 자동 감지 (prefers-color-scheme) */
@media (prefers-color-scheme: dark) {
  /* 시스템이 다크모드일 때 자동 적용 (수동 설정 없을 시) */
  .density-calculator-container:not(.dark):not(.light) {
    /* 배경색 */
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-section: #2d2d2d;
    
    /* 테두리 */
    --border-color: #e0e0e0;
    
    /* 텍스트 */
    --text-primary: #e8e8e8;
    --text-secondary: #b0b0b0;
    --text-light: #909090;
    
    /* 브랜드 색상 */
    --color-accent: #5dade2;
    --color-success: #52c77a;
    --color-warning: #f5b041;
    --color-danger: #ec7063;
    --color-purple: #af7ac5;
    --color-teal: #48d1cc;
    
    /* 그림자 */
    --shadow-sm: 2px 2px 0 rgba(255,255,255,0.08);
    --shadow-md: 4px 4px 0 rgba(255,255,255,0.12);
    --shadow-lg: 8px 8px 0 rgba(255,255,255,0.12);
    
    /* 입력 포커스 */
    --input-focus-bg: #3a3a3a;
    
    /* 헤더 타이틀 */
    --title-color: #7fb3d5;
    --title-shadow: 2px 2px 0 rgba(0,0,0,0.5);
    
    /* 버튼 호버 배경 */
    --btn-hover-overlay: rgba(255,255,255,0.1);
  }
}

/* 기본 리셋 */
.density-calculator-container,
.density-calculator-container *,
.density-calculator-container *::before,
.density-calculator-container *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* 메인 컨테이너 */
.density-calculator-container {
  position: relative;
  max-width: var(--max-width);
  width: 100%;
  margin: 15px auto;
  padding: 12px;
  background: var(--bg-primary);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  font-family: 'Noto Sans KR', 'Malgun Gothic', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text-primary);
  line-height: 1.5;
  transition: background 0.3s ease, border-color 0.3s ease;
}

/* 다크모드 토글 버튼 */
.density-calculator-container .dark-mode-toggle {
  position: absolute;
  top: 12px;
  right: 12px;
  padding: 8px 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: var(--shadow-sm);
  font-size: 18px;
  z-index: 10;
  line-height: 1;
}

.density-calculator-container .dark-mode-toggle:hover {
  transform: translate(0.5px, 0.5px);
  box-shadow: 1.5px 1.5px 0 rgba(0,0,0,0.15);
}

.density-calculator-container .dark-mode-toggle:active {
  transform: translate(2px, 2px);
  box-shadow: none;
}

.density-calculator-container .theme-icon {
  display: block;
}

/* 헤더 */
.density-calculator-container .calculator-header {
  text-align: center;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 3px double var(--border-color);
}

.density-calculator-container .calculator-title {
  font-size: var(--font-size-title);
  font-weight: 700;
  color: var(--title-color);
  text-shadow: var(--title-shadow);
  line-height: 1.2;
  margin: 0 0 6px 0;
}

.density-calculator-container .calculator-subtitle {
  font-size: var(--font-size-base);
  color: var(--text-light);
  font-weight: 500;
  margin: 0;
  line-height: 1.4;
}

/* 메인 그리드 (2열 레이아웃) */
.density-calculator-container .calculator-main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}

/* 섹션 공통 스타일 */
.density-calculator-container .input-section,
.density-calculator-container .result-section {
  padding: 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.density-calculator-container .section-title {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: var(--font-size-large);
  font-weight: 700;
  margin: 0 0 10px 0;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border-color);
  color: var(--text-primary);
}

.density-calculator-container .section-title svg {
  flex-shrink: 0;
}

/* 입력 그룹 */
.density-calculator-container .input-group {
  margin-bottom: var(--spacing-md);
}

.density-calculator-container .input-label {
  display: block;
  font-size: var(--font-size-small);
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
}

.density-calculator-container .input-with-unit {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--spacing-sm);
}

/* 입력 필드 */
.density-calculator-container .number-input,
.density-calculator-container .unit-select {
  padding: 10px;
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: var(--font-size-base);
  font-weight: 600;
  background: var(--bg-section);
  color: var(--text-primary);
  transition: all 0.15s ease;
  font-family: 'Courier New', monospace;
}

.density-calculator-container .number-input {
  width: 100%;
  max-width: 100%;
}

.density-calculator-container .unit-select {
  min-width: 140px;
  cursor: pointer;
  max-width: 100%;
  font-family: 'Noto Sans KR', 'Malgun Gothic', -apple-system, BlinkMacSystemFont, sans-serif;
}

.density-calculator-container .number-input:focus,
.density-calculator-container .unit-select:focus {
  outline: none;
  border-color: var(--color-accent);
  background: var(--input-focus-bg);
  box-shadow: 2px 2px 0 rgba(52, 152, 219, 0.3);
}

/* 계산하기 버튼 */
.density-calculator-container .calculate-btn {
  width: 100%;
  padding: 12px;
  background: var(--color-accent);
  color: #fff;
  border: 1.5px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: all 0.15s ease;
  margin-top: var(--spacing-md);
}

.density-calculator-container .calculate-btn:hover {
  filter: brightness(0.9);
  transform: translate(1px, 1px);
  box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.15);
}

.density-calculator-container .calculate-btn:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 rgba(0, 0, 0, 0.15);
}

/* 버튼 그룹 (샘플/초기화) */
.density-calculator-container .button-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-sm);
}

.density-calculator-container .sample-btn,
.density-calculator-container .reset-btn {
  padding: 10px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: var(--font-size-small);
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
  box-shadow: var(--shadow-sm);
}

.density-calculator-container .sample-btn {
  background: var(--color-success);
  color: #fff;
}

.density-calculator-container .reset-btn {
  background: var(--color-warning);
  color: #fff;
}

.density-calculator-container .sample-btn:hover,
.density-calculator-container .reset-btn:hover {
  filter: brightness(0.9);
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0 rgba(0, 0, 0, 0.1);
}

.density-calculator-container .sample-btn:active,
.density-calculator-container .reset-btn:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 rgba(0, 0, 0, 0.1);
}

/* 결과 영역 */
.density-calculator-container .result-content {
  min-height: 200px;
}

.density-calculator-container .result-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  color: var(--text-light);
  text-align: center;
}

.density-calculator-container .placeholder-icon {
  font-size: 48px;
  margin-bottom: 10px;
  opacity: 0.3;
}

.density-calculator-container .result-placeholder p {
  font-size: var(--font-size-base);
}

/* 결과 상세 */
.density-calculator-container .result-details {
  animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 주요 결과 카드 */
.density-calculator-container .result-card {
  padding: 12px;
  background: var(--color-accent);
  color: #fff;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-md);
  text-align: center;
}

.density-calculator-container .result-label {
  font-size: var(--font-size-base);
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  opacity: 0.9;
}

.density-calculator-container .result-value {
  font-size: 32px;
  font-weight: 900;
  font-family: 'Courier New', monospace;
}

/* 결과 그리드 (다양한 단위) */
.density-calculator-container .result-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.density-calculator-container .result-item {
  padding: 10px;
  background: var(--bg-section);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: background 0.3s ease;
}

.density-calculator-container .result-item-label {
  display: block;
  font-size: 12px;
  color: var(--text-light);
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.density-calculator-container .result-item-value {
  display: block;
  font-size: 16px;
  font-weight: 800;
  color: var(--text-primary);
  font-family: 'Courier New', monospace;
}

/* 정보 카드 */
.density-calculator-container .info-card {
  padding: 12px;
  background: var(--bg-section);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--spacing-md);
  transition: background 0.3s ease;
}

.density-calculator-container .info-title {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: var(--font-size-base);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.density-calculator-container .info-title svg {
  flex-shrink: 0;
}

.density-calculator-container .info-content {
  font-size: var(--font-size-small);
  line-height: 1.6;
  color: var(--text-secondary);
}

.density-calculator-container .info-content p {
  margin-bottom: var(--spacing-sm);
}

.density-calculator-container .info-content p:last-child {
  margin-bottom: 0;
}

.density-calculator-container .info-content strong {
  font-weight: 700;
  color: var(--text-primary);
}

/* 복사 버튼 */
.density-calculator-container .copy-btn {
  width: 100%;
  padding: 12px;
  background: var(--color-success);
  color: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: var(--font-size-base);
  font-weight: 700;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: all 0.15s ease;
}

.density-calculator-container .copy-btn:hover {
  filter: brightness(0.9);
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0 rgba(0, 0, 0, 0.15);
}

.density-calculator-container .copy-btn:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 rgba(0, 0, 0, 0.15);
}

/* 반응형 - 태블릿 (768px 이하) */
@media (max-width: 768px) {
  .density-calculator-container {
    margin: 8px 5px;
    padding: 10px;
    width: calc(100% - 10px);
    max-width: 100%;
  }
  
  .density-calculator-container .calculator-main {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  
  .density-calculator-container .calculator-title {
    font-size: 22px;
  }
  
  .density-calculator-container .result-value {
    font-size: 28px;
  }
  
  .density-calculator-container .dark-mode-toggle {
    top: 10px;
    right: 10px;
    padding: 6px 10px;
  }
}

/* 반응형 - 모바일 (480px 이하) */
@media (max-width: 480px) {
  .density-calculator-container {
    margin: 8px 5px;
    padding: 8px;
    width: calc(100% - 10px);
    border-width: var(--border-width-thin);
  }
  
  .density-calculator-container .calculator-header {
    padding-bottom: 6px;
    margin-bottom: 8px;
  }
  
  .density-calculator-container .calculator-title {
    font-size: 20px;
  }
  
  .density-calculator-container .section-title {
    font-size: 16px;
  }
  
  .density-calculator-container .input-section,
  .density-calculator-container .result-section {
    padding: 10px;
  }
  
  .density-calculator-container .input-group {
    margin-bottom: 8px;
  }
  
  .density-calculator-container .input-with-unit {
    grid-template-columns: 1fr;
  }
  
  .density-calculator-container .unit-select {
    width: 100%;
    min-width: auto;
  }
  
  .density-calculator-container .result-grid {
    grid-template-columns: 1fr;
  }
  
  .density-calculator-container .result-value {
    font-size: 24px;
  }
  
  .density-calculator-container .button-group {
    grid-template-columns: 1fr;
    gap: 6px;
  }
  
  .density-calculator-container .dark-mode-toggle {
    top: 8px;
    right: 8px;
    padding: 6px 10px;
    font-size: 16px;
  }
}