/* Heat Index Calculator Styles */

/* Global box-sizing */
.heat-index-calculator-container,
.heat-index-calculator-container *,
.heat-index-calculator-container *::before,
.heat-index-calculator-container *::after {
  box-sizing: border-box;
}

/* ========== CSS Variables ========== */

/* 🌞 Light Mode (Default) */
.heat-index-calculator-container {
  /* Background colors */
  --bg-primary: #f5f5f0;
  --bg-secondary: #fff;
  --bg-section: #fff;
  
  /* Borders */
  --border-color: #333;
  
  /* Text colors */
  --text-primary: #222;
  --text-secondary: #555;
  --text-light: #666;
  
  /* Brand colors */
  --color-accent: #3498db;
  --color-success: #27ae60;
  --color-warning: #f39c12;
  --color-danger: #e74c3c;
  --color-purple: #9b59b6;
  --color-teal: #1abc9c;
  
  /* Shadows (neobrutalism) */
  --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);
  
  /* Border radius */
  --radius-container: 8px;
  --radius-section: 6px;
  --radius-button: 4px;
  --radius-input: 4px;
  
  /* Input focus */
  --input-focus-bg: #fffacd;
  
  /* Header title */
  --title-color: #2c3e50;
  --title-shadow: 2px 2px 0 rgba(255,255,255,0.5);
  
  /* Button hover background */
  --btn-hover-overlay: rgba(0,0,0,0.1);
  
  /* Copy button background */
  --copy-btn-bg: #fff;
  --copy-btn-hover-bg: #f0f0f0;
}

/* 🌙 Dark Mode (Manual Toggle) */
.heat-index-calculator-container.dark {
  /* Background colors */
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --bg-section: #2d2d2d;
  
  /* Borders */
  --border-color: #e0e0e0;
  
  /* Text colors */
  --text-primary: #e8e8e8;
  --text-secondary: #b0b0b0;
  --text-light: #909090;
  
  /* Brand colors */
  --color-accent: #5dade2;
  --color-success: #52c77a;
  --color-warning: #f5b041;
  --color-danger: #ec7063;
  --color-purple: #af7ac5;
  --color-teal: #48d1cc;
  
  /* Shadows */
  --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);
  
  /* Input focus */
  --input-focus-bg: #3a3a3a;
  
  /* Header title */
  --title-color: #7fb3d5;
  --title-shadow: 2px 2px 0 rgba(0,0,0,0.5);
  
  /* Button hover background */
  --btn-hover-overlay: rgba(255,255,255,0.1);
  
  /* Copy button background */
  --copy-btn-bg: #3a3a3a;
  --copy-btn-hover-bg: #4a4a4a;
}

/* 🌙 System Dark Mode (Auto Detection) */
@media (prefers-color-scheme: dark) {
  .heat-index-calculator-container:not(.dark):not(.light) {
    /* Background colors */
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-section: #2d2d2d;
    
    /* Borders */
    --border-color: #e0e0e0;
    
    /* Text colors */
    --text-primary: #e8e8e8;
    --text-secondary: #b0b0b0;
    --text-light: #909090;
    
    /* Brand colors */
    --color-accent: #5dade2;
    --color-success: #52c77a;
    --color-warning: #f5b041;
    --color-danger: #ec7063;
    --color-purple: #af7ac5;
    --color-teal: #48d1cc;
    
    /* Shadows */
    --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);
    
    /* Input focus */
    --input-focus-bg: #3a3a3a;
    
    /* Header title */
    --title-color: #7fb3d5;
    --title-shadow: 2px 2px 0 rgba(0,0,0,0.5);
    
    /* Button hover background */
    --btn-hover-overlay: rgba(255,255,255,0.1);
    
    /* Copy button background */
    --copy-btn-bg: #3a3a3a;
    --copy-btn-hover-bg: #4a4a4a;
  }
}

/* ========== Main Container ========== */

.heat-index-calculator-container {
  position: relative;
  max-width: 700px;
  width: 100%;
  margin: 10px auto;
  padding: 10px;
  background: var(--bg-primary);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-container);
  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;
}

/* ========== Dark Mode Toggle ========== */

.dark-mode-toggle {
  position: absolute;
  top: 10px;
  right: 10px;
  padding: 6px 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-button);
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 2px 2px 0 rgba(0,0,0,0.15);
  font-size: 15.5px;
  font-weight: 600;
  color: var(--text-primary);
  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);
  background: var(--copy-btn-hover-bg);
}

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

/* ========== Header ========== */

.calculator-header {
  text-align: center;
  margin-bottom: 8px;
  padding-bottom: 6px;
  border-bottom: 3px double var(--border-color);
}

.calculator-header h2 {
  margin: 0 0 4px 0;
  font-size: 28px;
  font-weight: 700;
  color: var(--title-color);
  text-shadow: var(--title-shadow);
}

.calculator-subtitle {
  margin: 0;
  font-size: 14px;
  color: var(--text-secondary);
}

/* ========== Main Content ========== */

.main-content {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* ========== Sections ========== */

.input-section,
.result-section {
  background: var(--bg-section);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-section);
  padding: 12px;
  box-shadow: var(--shadow-md);
}

.section-header {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 12px;
  font-weight: 600;
  font-size: 16px;
  color: var(--text-primary);
}

.section-header svg {
  flex-shrink: 0;
}

/* ========== Unit Toggle ========== */

.unit-toggle {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
  padding: 8px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-input);
}

.unit-toggle label {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6px 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-button);
  cursor: pointer;
  transition: all 0.2s;
  font-size: 14px;
  font-weight: 500;
}

.unit-toggle label:hover {
  background: var(--copy-btn-hover-bg);
}

.unit-toggle input[type="radio"] {
  display: none;
}

.unit-toggle input[type="radio"]:checked + span {
  font-weight: 700;
  color: var(--color-accent);
}

/* ========== Input Groups ========== */

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

.input-group:last-of-type {
  margin-bottom: 0;
}

.input-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.label-text {
  margin-right: 4px;
}

.label-unit {
  color: var(--text-secondary);
  font-weight: 400;
  font-size: 13px;
}

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

.input-group input:focus {
  outline: none;
  background: var(--input-focus-bg);
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.1);
}

.input-group input::placeholder {
  color: var(--text-light);
  opacity: 0.6;
}

/* ========== Buttons ========== */

.btn-calculate {
  width: 100%;
  padding: 12px 20px;
  margin-top: 12px;
  background: var(--color-accent);
  color: white;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-button);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

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

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

.button-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 8px;
}

.btn-sample,
.btn-reset {
  padding: 10px 16px;
  color: white;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-button);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.btn-sample {
  background: var(--color-success);
}

.btn-reset {
  background: var(--color-warning);
}

.btn-sample:hover,
.btn-reset:hover {
  transform: translate(0.5px, 0.5px);
  box-shadow: 1.5px 1.5px 0 rgba(0,0,0,0.15);
}

.btn-sample:hover {
  background: linear-gradient(var(--btn-hover-overlay), var(--btn-hover-overlay)), var(--color-success);
}

.btn-reset:hover {
  background: linear-gradient(var(--btn-hover-overlay), var(--btn-hover-overlay)), var(--color-warning);
}

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

/* ========== Result Display ========== */

.heat-index-display {
  text-align: center;
  padding: 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-section);
  margin-bottom: 12px;
}

.result-label {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 8px;
  font-weight: 500;
}

.result-value {
  font-size: 36px;
  font-weight: 700;
  font-family: 'Courier New', monospace;
  color: var(--color-accent);
  text-shadow: 2px 2px 0 rgba(0,0,0,0.1);
}

/* ========== Warning Level ========== */

.warning-level {
  display: flex;
  gap: 12px;
  padding: 12px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-section);
  margin-bottom: 12px;
  align-items: flex-start;
}

.warning-icon {
  font-size: 32px;
  flex-shrink: 0;
  line-height: 1;
}

.warning-content {
  flex: 1;
}

.warning-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 4px;
}

.warning-description {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* Warning Level Colors */
.warning-level.safe {
  border-left: 4px solid var(--color-success);
}

.warning-level.caution {
  border-left: 4px solid var(--color-warning);
}

.warning-level.extreme-caution {
  border-left: 4px solid #ff8c00;
}

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

.warning-level.extreme-danger {
  border-left: 4px solid #8b0000;
}

/* ========== Info Box ========== */

.info-box {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-section);
  padding: 12px;
}

.info-header {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.info-content {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.level-guide {
  padding: 8px;
  border-left: 3px solid;
  background: var(--bg-secondary);
  border-radius: 3px;
  font-size: 13px;
  line-height: 1.4;
}

.level-guide strong {
  color: var(--text-primary);
}

.level-caution {
  border-left-color: var(--color-warning);
}

.level-extreme-caution {
  border-left-color: #ff8c00;
}

.level-danger {
  border-left-color: var(--color-danger);
}

.level-extreme-danger {
  border-left-color: #8b0000;
}

/* ========== Toast Notification ========== */

.toast {
  position: fixed;
  bottom: -100px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-button);
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  transition: bottom 0.3s ease;
  min-width: 280px;
  max-width: 90%;
}

.toast.show {
  bottom: 20px;
}

.toast-icon {
  font-size: 24px;
  flex-shrink: 0;
}

.toast-content {
  flex: 1;
}

.toast-title {
  font-weight: 700;
  font-size: 14px;
  margin-bottom: 2px;
  color: var(--text-primary);
}

.toast-message {
  font-size: 13px;
  color: var(--text-secondary);
}

/* Toast Types */
.toast.success .toast-icon {
  color: var(--color-success);
}

.toast.error .toast-icon {
  color: var(--color-danger);
}

.toast.warning .toast-icon {
  color: var(--color-warning);
}

.toast.info .toast-icon {
  color: var(--color-accent);
}

/* ========== Responsive Design ========== */

@media (max-width: 768px) {
  .heat-index-calculator-container {
    margin: 8px 5px;
    width: calc(100% - 10px);
    padding: 10px;
  }
  
  .calculator-header h2 {
    font-size: 24px;
  }
  
  .result-value {
    font-size: 32px;
  }
}

@media (max-width: 480px) {
  .heat-index-calculator-container {
    padding: 8px;
    border-width: 1px;
  }
  
  .calculator-header h2 {
    font-size: 22px;
  }
  
  .calculator-subtitle {
    font-size: 13px;
  }
  
  .result-value {
    font-size: 28px;
  }
  
  .button-group {
    grid-template-columns: 1fr;
  }
  
  .dark-mode-toggle {
    padding: 5px 8px;
    font-size: 14px;
  }
}