/* ===========================
   전역 box-sizing 설정
   =========================== */
.percent-calculator-container,
.percent-calculator-container *,
.percent-calculator-container *::before,
.percent-calculator-container *::after {
  box-sizing: border-box;
}

/* ===========================
   CSS 변수 정의 - 라이트 모드 (기본)
   =========================== */
.percent-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);
  
  /* 복사 버튼 배경 */
  --copy-btn-bg: #fff;
  --copy-btn-hover-bg: #f0f0f0;
  
  /* 탭 버튼 */
  --tab-inactive-bg: #e8e8e8;
  --tab-hover-bg: #d8d8d8;
}

/* ===========================
   다크 모드 - 수동 토글
   =========================== */
.percent-calculator-container.dark {
  /* 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);
  
  /* 복사 버튼 배경 */
  --copy-btn-bg: #3a3a3a;
  --copy-btn-hover-bg: #4a4a4a;
  
  /* 탭 버튼 */
  --tab-inactive-bg: #3a3a3a;
  --tab-hover-bg: #4a4a4a;
}

/* ===========================
   시스템 다크모드 자동 감지
   =========================== */
@media (prefers-color-scheme: dark) {
  .percent-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);
    
    /* 복사 버튼 배경 */
    --copy-btn-bg: #3a3a3a;
    --copy-btn-hover-bg: #4a4a4a;
    
    /* 탭 버튼 */
    --tab-inactive-bg: #3a3a3a;
    --tab-hover-bg: #4a4a4a;
  }
}

/* ===========================
   메인 컨테이너
   =========================== */
.percent-calculator-container {
  position: relative;
  max-width: 1180px;
  width: 100%;
  margin: 15px auto;
  padding: 12px;
  background: var(--bg-primary);
  border: 2px solid var(--border-color);
  font-family: 'Noto Sans KR', 'Malgun Gothic', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text-primary);
  box-shadow: var(--shadow-lg);
  line-height: 1.5;
}

/* ===========================
   다크모드 토글 버튼
   =========================== */
.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: 2px 2px 0 rgba(0,0,0,0.15);
  font-size: 18px;
  z-index: 10;
}

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

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

.theme-icon {
  display: inline-block;
  line-height: 1;
}

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

.calculator-header h2 {
  margin: 0 0 6px 0;
  font-size: 28px;
  font-weight: 700;
  color: var(--title-color);
  text-shadow: var(--title-shadow);
  line-height: 1.2;
}

.subtitle {
  margin: 0;
  font-size: 15px;
  color: var(--text-light);
  line-height: 1.4;
}

/* ===========================
   계산 유형 탭
   =========================== */
.calc-tabs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 6px;
  margin-bottom: 12px;
}

.calc-tab-btn {
  padding: 10px 8px;
  border: 1px solid var(--border-color);
  background: var(--tab-inactive-bg);
  color: var(--text-primary);
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  font-size: 14px;
  transition: all 0.2s;
  box-shadow: var(--shadow-sm);
}

.calc-tab-btn:hover {
  background: var(--tab-hover-bg);
  transform: translate(0.5px, 0.5px);
  box-shadow: 1px 1px 0 rgba(0,0,0,0.1);
}

.calc-tab-btn:active {
  transform: translate(2px, 2px);
  box-shadow: none;
}

.calc-tab-btn.active {
  background: var(--color-accent);
  color: white;
  border-color: var(--border-color);
  box-shadow: var(--shadow-md);
}

.calc-tab-btn small {
  display: block;
  font-size: 12px;
  font-weight: normal;
  margin-top: 3px;
  opacity: 0.85;
}

/* ===========================
   메인 그리드
   =========================== */
.calculator-main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}

/* ===========================
   섹션 공통 스타일
   =========================== */
.input-section,
.result-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 12px;
  box-shadow: var(--shadow-md);
}

.section-title {
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 0 0 10px 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.2;
}

.input-section .section-title {
  color: var(--color-accent);
}

.result-section .section-title {
  color: var(--color-success);
}

.current-mode {
  display: inline-block;
  margin-left: auto;
  background: var(--bg-primary);
  padding: 3px 8px;
  border: 1px solid var(--border-color);
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ===========================
   입력 그룹
   =========================== */
.calc-form {
  display: block;
}

.calc-form.hidden {
  display: none;
}

.input-group {
  margin-bottom: 12px;
}

.input-group label {
  display: block;
  margin-bottom: 5px;
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 14px;
}

.input-group input,
.input-group select {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--border-color);
  font-size: 15px;
  color: var(--text-primary);
  background: var(--bg-section);
  transition: all 0.2s;
  font-family: 'Courier New', monospace;
}

.input-group input:focus,
.input-group select:focus {
  outline: none;
  background: var(--input-focus-bg);
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

.input-group .hint {
  font-size: 13px;
  color: var(--text-light);
  margin-top: 4px;
}

.input-addon {
  position: relative;
}

.input-addon input {
  padding-right: 35px;
}

.input-addon .addon {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 15px;
  pointer-events: none;
}

/* ===========================
   빠른 퍼센트 버튼
   =========================== */
.quick-percent-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
  margin-top: 6px;
}

.quick-percent-btn {
  padding: 6px 8px;
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  transition: all 0.2s;
  box-shadow: 1px 1px 0 rgba(0,0,0,0.1);
}

.quick-percent-btn:hover {
  background: var(--color-teal);
  color: white;
  transform: translate(0.5px, 0.5px);
  box-shadow: 0.5px 0.5px 0 rgba(0,0,0,0.1);
}

.quick-percent-btn:active {
  transform: translate(1px, 1px);
  box-shadow: none;
}

/* ===========================
   버튼 스타일 (네오브루탈리즘)
   =========================== */
.btn-calculate {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 12px 16px;
  margin-top: 12px;
  background: var(--color-accent);
  color: white;
  border: 1.5px solid var(--border-color);
  cursor: pointer;
  font-weight: 700;
  font-size: 16px;
  transition: all 0.2s;
  box-shadow: var(--shadow-md);
}

.btn-calculate:hover {
  background: var(--color-accent);
  filter: brightness(1.1);
  transform: translate(1px, 1px);
  box-shadow: 3px 3px 0 rgba(0,0,0,0.15);
}

.btn-calculate:active {
  transform: translate(4px, 4px);
  box-shadow: none;
}

.btn-reset {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 14px;
  margin-top: 6px;
  background: var(--color-warning);
  color: white;
  border: 1px solid var(--border-color);
  cursor: pointer;
  font-weight: 600;
  font-size: 15px;
  transition: all 0.2s;
  box-shadow: var(--shadow-sm);
}

.btn-reset:hover {
  background: var(--color-warning);
  filter: brightness(1.1);
  transform: translate(0.5px, 0.5px);
  box-shadow: 1.5px 1.5px 0 rgba(0,0,0,0.1);
}

.btn-reset:active {
  transform: translate(2px, 2px);
  box-shadow: none;
}

/* ===========================
   결과 영역
   =========================== */
.result-content {
  margin-bottom: 12px;
  min-height: 100px;
}

.no-result {
  text-align: center;
  color: var(--text-light);
  font-size: 15px;
  padding: 30px 20px;
  background: var(--bg-primary);
  border: 1px dashed var(--border-color);
}

.result-row {
  margin-bottom: 8px;
  font-size: 15px;
  color: var(--text-primary);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 6px 0;
  border-bottom: 1px dotted var(--border-color);
}

.result-row:last-child {
  border-bottom: none;
}

.result-row .label {
  font-weight: 600;
  color: var(--text-secondary);
}

.result-row .value {
  font-weight: 700;
  color: var(--color-accent);
  font-family: 'Courier New', monospace;
}

.result-row.highlight {
  margin-top: 10px;
  padding: 12px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--color-success);
  box-shadow: var(--shadow-sm);
}

.result-row.highlight .value {
  font-size: 18px;
  color: var(--color-success);
}

.calculation-process {
  margin-top: 10px;
  padding: 10px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.6;
}

/* ===========================
   퍼센트 바
   =========================== */
.percent-bar {
  margin: 15px 0;
  position: relative;
}

.percent-bar.hidden {
  display: none;
}

.percent-bar-labels {
  display: flex;
  justify-content: space-between;
  margin-bottom: 6px;
  font-size: 13px;
  color: var(--text-light);
  font-weight: 600;
}

.percent-bar-track {
  height: 14px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  position: relative;
  box-shadow: inset 1px 1px 3px rgba(0,0,0,0.1);
}

.percent-bar-pointer {
  position: absolute;
  height: 20px;
  width: 3px;
  background: var(--color-accent);
  border: 1px solid var(--border-color);
  top: -3px;
  transform: translateX(-2px);
  transition: left 0.3s ease;
  box-shadow: var(--shadow-sm);
}

.percent-bar-value {
  position: absolute;
  top: -30px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-accent);
  color: white;
  padding: 3px 8px;
  border: 1px solid var(--border-color);
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
}

/* ===========================
   복사 버튼
   =========================== */
.copy-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 14px;
  margin-top: 12px;
  background: var(--copy-btn-bg);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  cursor: pointer;
  font-weight: 600;
  font-size: 15px;
  transition: all 0.2s;
  box-shadow: var(--shadow-sm);
}

.copy-btn:hover {
  background: var(--copy-btn-hover-bg);
  transform: translate(0.5px, 0.5px);
  box-shadow: 1.5px 1.5px 0 rgba(0,0,0,0.1);
}

.copy-btn:active {
  transform: translate(2px, 2px);
  box-shadow: none;
}

.copy-btn.hidden {
  display: none;
}

/* ===========================
   안내 메시지
   =========================== */
.notice {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  text-align: center;
  font-size: 13px;
  color: var(--text-secondary);
  padding: 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

/* ===========================
   토스트 알림
   =========================== */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 350px;
}

.toast {
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  animation: slideIn 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toast.success {
  border-left: 4px solid var(--color-success);
}

.toast.error {
  border-left: 4px solid var(--color-danger);
}

.toast.info {
  border-left: 4px solid var(--color-accent);
}

@keyframes slideIn {
  from {
    transform: translateX(400px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes slideOut {
  from {
    transform: translateX(0);
    opacity: 1;
  }
  to {
    transform: translateX(400px);
    opacity: 0;
  }
}

.toast.removing {
  animation: slideOut 0.3s ease;
}

/* ===========================
   반응형 디자인 - 768px
   =========================== */
@media screen and (max-width: 768px) {
  .percent-calculator-container {
    margin: 8px 5px;
    width: calc(100% - 10px);
    padding: 10px;
  }
  
  .dark-mode-toggle {
    top: 10px;
    right: 10px;
    padding: 6px 10px;
    font-size: 16px;
  }
  
  .calculator-header h2 {
    font-size: 24px;
  }
  
  .subtitle {
    font-size: 14px;
  }
  
  .calc-tabs {
    grid-template-columns: repeat(2, 1fr);
    gap: 4px;
  }
  
  .calc-tab-btn {
    padding: 8px 6px;
    font-size: 13px;
  }
  
  .calc-tab-btn small {
    font-size: 11px;
  }
  
  .calculator-main {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  
  .input-section,
  .result-section {
    padding: 10px;
  }
  
  .section-title {
    font-size: 16px;
  }
  
  .current-mode {
    font-size: 12px;
    padding: 2px 6px;
  }
  
  .input-group label {
    font-size: 13px;
  }
  
  .input-group input,
  .input-group select {
    font-size: 14px;
    padding: 9px;
  }
  
  .btn-calculate {
    font-size: 15px;
    padding: 11px 14px;
  }
  
  .btn-reset {
    font-size: 14px;
    padding: 9px 12px;
  }
  
  .result-row {
    font-size: 14px;
  }
  
  .result-row.highlight .value {
    font-size: 17px;
  }
  
  .notice {
    font-size: 12px;
    padding: 8px;
  }
  
  .toast-container {
    top: 10px;
    right: 10px;
    max-width: calc(100% - 20px);
  }
}

/* ===========================
   반응형 디자인 - 480px
   =========================== */
@media screen and (max-width: 480px) {
  .percent-calculator-container {
    padding: 8px;
    border-width: 1px;
  }
  
  .dark-mode-toggle {
    top: 8px;
    right: 8px;
    padding: 5px 8px;
    font-size: 14px;
  }
  
  .calculator-header {
    padding-bottom: 8px;
  }
  
  .calculator-header h2 {
    font-size: 22px;
  }
  
  .subtitle {
    font-size: 13px;
  }
  
  .calc-tabs {
    grid-template-columns: 1fr;
    gap: 3px;
  }
  
  .calc-tab-btn {
    padding: 8px;
    font-size: 14px;
  }
  
  .calc-tab-btn small {
    display: none;
  }
  
  .input-section,
  .result-section {
    padding: 8px;
  }
  
  .section-title {
    font-size: 15px;
    gap: 4px;
  }
  
  .section-title svg {
    width: 16px;
    height: 16px;
  }
  
  .current-mode {
    font-size: 11px;
    padding: 2px 5px;
  }
  
  .input-group {
    margin-bottom: 10px;
  }
  
  .input-group label {
    font-size: 12px;
    margin-bottom: 4px;
  }
  
  .input-group input,
  .input-group select {
    font-size: 13px;
    padding: 8px;
  }
  
  .input-group .hint {
    font-size: 12px;
  }
  
  .quick-percent-buttons {
    grid-template-columns: repeat(2, 1fr);
    gap: 3px;
  }
  
  .quick-percent-btn {
    padding: 5px 6px;
    font-size: 12px;
  }
  
  .btn-calculate {
    font-size: 14px;
    padding: 10px 12px;
  }
  
  .btn-reset {
    font-size: 13px;
    padding: 8px 10px;
  }
  
  .result-row {
    font-size: 13px;
  }
  
  .result-row.highlight {
    padding: 10px;
  }
  
  .result-row.highlight .value {
    font-size: 16px;
  }
  
  .calculation-process {
    font-size: 13px;
    padding: 8px;
  }
  
  .copy-btn {
    font-size: 14px;
    padding: 9px 12px;
  }
  
  .notice {
    font-size: 11px;
    padding: 8px;
  }
  
  .toast {
    font-size: 13px;
    padding: 10px 12px;
  }
}