/* ═══════════════════════════════════════════════════════════════
   BLOOD GAS GENERATOR - STYLES
   A modern, clinical-inspired design
   ═══════════════════════════════════════════════════════════════ */

:root {
  /* Color Palette - Clinical/Medical Theme */
  --bg-primary: #0a0e14;
  --bg-secondary: #131920;
  --bg-tertiary: #1a2129;
  --bg-elevated: #1f2832;
  
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  
  --accent-blue: #58a6ff;
  --accent-green: #3fb950;
  --accent-yellow: #d29922;
  --accent-orange: #db6d28;
  --accent-red: #f85149;
  --accent-purple: #a371f7;
  
  --border-color: #30363d;
  --border-subtle: #21262d;
  
  /* Severity Colors */
  --severity-normal: var(--accent-green);
  --severity-mild: var(--accent-yellow);
  --severity-moderate: var(--accent-orange);
  --severity-severe: var(--accent-red);
  --severity-critical: #ff4757;
  
  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  
  /* Typography */
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
}

/* ═══════════════════════════════════════════════════════════════
   BASE STYLES
   ═══════════════════════════════════════════════════════════════ */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ═══════════════════════════════════════════════════════════════
   LAYOUT
   ═══════════════════════════════════════════════════════════════ */

.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.header {
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  border-bottom: 1px solid var(--border-subtle);
  padding: var(--space-lg) var(--space-xl);
}

.header-content {
  max-width: 1400px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  color: var(--accent-blue);
  font-size: 1.5rem;
  font-weight: 700;
}

.logo svg {
  opacity: 0.9;
}

.tagline {
  color: var(--text-secondary);
  margin-top: var(--space-xs);
  font-size: 0.9rem;
}

.main {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(380px, 1fr) minmax(500px, 1.5fr);
  gap: var(--space-lg);
  padding: var(--space-lg) var(--space-xl);
  max-width: 1600px;
  margin: 0 auto;
  width: 100%;
}

@media (max-width: 1024px) {
  .main {
    grid-template-columns: 1fr;
  }
}

.footer {
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-md) var(--space-xl);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ═══════════════════════════════════════════════════════════════
   PANELS
   ═══════════════════════════════════════════════════════════════ */

.panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-subtle);
}

.panel-header h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.panel-content {
  padding: var(--space-lg);
}

/* ═══════════════════════════════════════════════════════════════
   CONTROLS
   ═══════════════════════════════════════════════════════════════ */

.control-group {
  margin-bottom: var(--space-lg);
}

.control-label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--space-sm);
  font-weight: 500;
  color: var(--text-primary);
}

.control-label .hint {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-muted);
}

/* Condition Selector */
.condition-selector {
  max-height: 250px;
  overflow-y: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
}

.condition-category {
  border-bottom: 1px solid var(--border-subtle);
}

.condition-category:last-child {
  border-bottom: none;
}

.category-header {
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-tertiary);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.condition-list {
  padding: var(--space-xs);
}

.condition-option {
  display: flex;
  align-items: center;
  padding: var(--space-sm) var(--space-md);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background 0.15s;
}

.condition-option:hover {
  background: var(--bg-elevated);
}

.condition-option input {
  margin-right: var(--space-sm);
  accent-color: var(--accent-blue);
}

.condition-option span {
  font-size: 0.9rem;
}

/* Selected Conditions */
.selected-conditions {
  margin-top: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.selected-condition {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.selected-condition .condition-name {
  flex: 1;
  font-size: 0.9rem;
  font-weight: 500;
}

.selected-condition .severity-slider {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.selected-condition .severity-slider label {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.selected-condition .severity-slider select {
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.8rem;
  cursor: pointer;
}

.selected-condition .remove-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: var(--space-xs);
  border-radius: var(--radius-sm);
  transition: all 0.15s;
}

.selected-condition .remove-btn:hover {
  color: var(--accent-red);
  background: rgba(248, 81, 73, 0.1);
}

/* Patient Factors */
.patient-factors {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.factor {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.factor label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  min-width: 40px;
}

.factor input[type="number"] {
  width: 70px;
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.factor input[type="range"] {
  flex: 1;
  accent-color: var(--accent-blue);
}

.factor .unit,
.factor .value {
  font-size: 0.8rem;
  color: var(--text-secondary);
  min-width: 35px;
}

/* Checkbox Group */
.checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.15s;
}

.checkbox-label:hover {
  border-color: var(--accent-blue);
}

.checkbox-label input {
  accent-color: var(--accent-blue);
}

/* Generate Button */
.generate-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  border: none;
  border-radius: var(--radius-md);
  color: white;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 4px 12px rgba(88, 166, 255, 0.3);
}

.generate-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(88, 166, 255, 0.4);
}

.generate-btn:active {
  transform: translateY(0);
}

/* ═══════════════════════════════════════════════════════════════
   RESULTS PANEL
   ═══════════════════════════════════════════════════════════════ */

.result-actions {
  display: flex;
  gap: var(--space-sm);
}

.action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s;
}

.action-btn:hover {
  color: var(--accent-blue);
  border-color: var(--accent-blue);
  background: rgba(88, 166, 255, 0.1);
}

/* Results Placeholder */
.results-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl);
  color: var(--text-muted);
  text-align: center;
}

.results-placeholder svg {
  margin-bottom: var(--space-md);
  opacity: 0.5;
}

/* Results Container */
.results-container {
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Severity Badge */
.severity-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-xs) var(--space-md);
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-lg);
}

.severity-badge.normal {
  background: rgba(63, 185, 80, 0.15);
  color: var(--severity-normal);
  border: 1px solid var(--severity-normal);
}

.severity-badge.mild {
  background: rgba(210, 153, 34, 0.15);
  color: var(--severity-mild);
  border: 1px solid var(--severity-mild);
}

.severity-badge.moderate {
  background: rgba(219, 109, 40, 0.15);
  color: var(--severity-moderate);
  border: 1px solid var(--severity-moderate);
}

.severity-badge.severe {
  background: rgba(248, 81, 73, 0.15);
  color: var(--severity-severe);
  border: 1px solid var(--severity-severe);
}

.severity-badge.critical {
  background: rgba(255, 71, 87, 0.2);
  color: var(--severity-critical);
  border: 1px solid var(--severity-critical);
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

/* Result Sections */
.result-section {
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--border-subtle);
}

.result-section:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.result-section h3 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

/* Result Grid */
.result-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.result-grid.abg-grid {
  grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 600px) {
  .result-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.result-item {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  transition: all 0.2s;
}

.result-item:hover {
  border-color: var(--accent-blue);
  background: var(--bg-elevated);
}

.result-item.highlight {
  border-color: var(--accent-purple);
  background: rgba(163, 113, 247, 0.1);
}

.result-item.abnormal-low {
  border-color: var(--accent-blue);
  background: rgba(88, 166, 255, 0.1);
}

.result-item.abnormal-high {
  border-color: var(--accent-red);
  background: rgba(248, 81, 73, 0.1);
}

.result-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

.result-value {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

.result-unit {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-left: var(--space-xs);
}

.result-normal {
  display: block;
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: var(--space-xs);
}

/* Interpretation */
.interpretation-content {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

.interpretation-item {
  margin-bottom: var(--space-md);
}

.interpretation-item:last-child {
  margin-bottom: 0;
}

.interpretation-item .label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-blue);
  margin-bottom: var(--space-xs);
}

.interpretation-item .value {
  color: var(--text-primary);
  line-height: 1.6;
}

/* Teaching Points */
.teaching-points {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.teaching-points li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  line-height: 1.5;
}

.teaching-points li::before {
  content: '💡';
  flex-shrink: 0;
}

/* ═══════════════════════════════════════════════════════════════
   MEASURED VALUES SECTION
   ═══════════════════════════════════════════════════════════════ */

.result-section h3 {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.result-section h3 svg {
  opacity: 0.7;
}

.measured-subsection {
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--border-subtle);
}

.measured-subsection:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.measured-subsection h4 {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-md);
  font-weight: 600;
}

/* ═══════════════════════════════════════════════════════════════
   WORKING OUT SECTION
   ═══════════════════════════════════════════════════════════════ */

.working-out-section {
  background: linear-gradient(135deg, 
    rgba(88, 166, 255, 0.05) 0%, 
    rgba(163, 113, 247, 0.05) 100%);
}

.working-out-section h3 {
  color: var(--accent-blue);
}

.working-out-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.working-step {
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  border-left: 4px solid var(--accent-purple);
  position: relative;
  transition: all 0.2s;
}

.working-step:hover {
  background: var(--bg-elevated);
}

/* Step Type Indicators */
.working-step.step-acidemia { border-left-color: var(--accent-red); }
.working-step.step-alkalemia { border-left-color: var(--accent-blue); }
.working-step.step-normal { border-left-color: var(--accent-green); }
.working-step.step-warning { border-left-color: var(--accent-yellow); }
.working-step.step-info { border-left-color: var(--accent-purple); }

.step-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.step-number {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  color: white;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}

.step-title {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.step-content {
  margin-left: calc(26px + var(--space-sm));
}

.step-calculation {
  font-family: var(--font-mono);
  background: var(--bg-primary);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--accent-blue);
  margin: var(--space-sm) 0;
  overflow-x: auto;
  border: 1px solid var(--border-subtle);
}

.step-calculation .highlight-value {
  color: var(--accent-purple);
  font-weight: 600;
}

.step-calculation .operator {
  color: var(--text-muted);
}

.step-result {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}

.step-result .result-indicator {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
}

.result-indicator.abnormal-low {
  background: rgba(88, 166, 255, 0.15);
  color: var(--accent-blue);
  border: 1px solid var(--accent-blue);
}

.result-indicator.abnormal-high {
  background: rgba(248, 81, 73, 0.15);
  color: var(--accent-red);
  border: 1px solid var(--accent-red);
}

.result-indicator.normal {
  background: rgba(63, 185, 80, 0.15);
  color: var(--accent-green);
  border: 1px solid var(--accent-green);
}

.result-indicator.elevated {
  background: rgba(210, 153, 34, 0.15);
  color: var(--accent-yellow);
  border: 1px solid var(--accent-yellow);
}

.step-explanation {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: var(--space-sm);
  line-height: 1.6;
}

.step-arrow {
  color: var(--accent-blue);
  font-weight: bold;
  margin: 0 var(--space-xs);
}

/* Interpretation Section Enhanced */
.interpretation-section {
  background: linear-gradient(135deg, 
    rgba(163, 113, 247, 0.05) 0%, 
    rgba(63, 185, 80, 0.05) 100%);
}

.interpretation-section h3 {
  color: var(--accent-purple);
}

.final-diagnosis {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.diagnosis-primary {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.5;
}

.diagnosis-secondary {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Teaching Section Enhanced */
.teaching-section {
  background: linear-gradient(135deg, 
    rgba(210, 153, 34, 0.05) 0%, 
    rgba(219, 109, 40, 0.05) 100%);
}

.teaching-section h3 {
  color: var(--accent-yellow);
}

/* ═══════════════════════════════════════════════════════════════
   SCROLLBAR
   ═══════════════════════════════════════════════════════════════ */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ═══════════════════════════════════════════════════════════════
   TOAST NOTIFICATIONS
   ═══════════════════════════════════════════════════════════════ */

.toast {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  color: var(--text-primary);
  font-size: 0.9rem;
  z-index: 1000;
  animation: slideIn 0.3s ease;
}

.toast.success {
  border-color: var(--accent-green);
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ═══════════════════════════════════════════════════════════════
   LANDING PAGE
   ═══════════════════════════════════════════════════════════════ */

.landing-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.landing-header {
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  border-bottom: 1px solid var(--border-subtle);
  padding: var(--space-2xl) var(--space-xl);
  text-align: center;
}

.landing-header-content {
  max-width: 800px;
  margin: 0 auto;
}

.logo-large {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  color: var(--accent-blue);
  margin-bottom: var(--space-md);
}

.logo-large svg {
  opacity: 0.9;
}

.logo-large h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin: 0;
}

.landing-tagline {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin: 0;
}

.landing-main {
  flex: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-xl);
  width: 100%;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}

@media (max-width: 900px) {
  .tools-grid {
    grid-template-columns: 1fr;
  }
}

.tool-card {
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  text-decoration: none;
  color: inherit;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}

.tool-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
  opacity: 0;
  transition: opacity 0.3s;
}

.tool-card:hover {
  border-color: var(--accent-blue);
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(88, 166, 255, 0.2);
}

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

.tool-card-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(88, 166, 255, 0.1), rgba(163, 113, 247, 0.1));
  border-radius: var(--radius-lg);
  color: var(--accent-blue);
}

.tool-card-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.tool-description {
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

.tool-features {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.feature-tag {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.tool-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-sm);
  border-top: 1px solid var(--border-subtle);
  margin-top: auto;
}

.tool-link {
  font-weight: 600;
  color: var(--accent-blue);
}

.tool-card:hover .tool-link {
  color: var(--accent-purple);
}

/* Landing Features Section */
.landing-features {
  margin-top: var(--space-2xl);
  text-align: center;
}

.landing-features h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-xl);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-lg);
}

.feature-item {
  padding: var(--space-lg);
}

.feature-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(88, 166, 255, 0.1), rgba(163, 113, 247, 0.1));
  border-radius: 50%;
  color: var(--accent-blue);
}

.feature-item h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.feature-item p {
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

.landing-footer {
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-lg) var(--space-xl);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-links {
  margin-top: var(--space-sm);
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--accent-blue);
}

.footer-links span {
  margin: 0 var(--space-sm);
  color: var(--text-muted);
}

/* ═══════════════════════════════════════════════════════════════
   EXPLORER PAGE
   ═══════════════════════════════════════════════════════════════ */

.explorer-app {
  min-height: 100vh;
}

.explorer-main {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(300px, 400px) minmax(500px, 1fr);
  gap: var(--space-lg);
  padding: var(--space-lg) var(--space-xl);
  max-width: 1600px;
  margin: 0 auto;
  width: 100%;
}

@media (max-width: 1024px) {
  .explorer-main {
    grid-template-columns: 1fr;
  }
}

/* Instructions Panel */
.instructions-panel {
  height: fit-content;
}

.instructions {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.instruction-item {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
}

.instruction-number {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.instruction-text strong {
  display: block;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
  font-size: 0.95rem;
}

.instruction-text p {
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.5;
  margin: 0;
}

.explorer-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.action-btn-primary {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  border: none;
  border-radius: var(--radius-md);
  color: white;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.action-btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(88, 166, 255, 0.4);
}

.action-btn-secondary {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.action-btn-secondary:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  background: rgba(88, 166, 255, 0.1);
}

/* Explorer Panel */
.explorer-panel .panel-content {
  padding: var(--space-lg);
}

.explorer-section {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--border-subtle);
}

.explorer-section:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.explorer-section h3 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

.explorer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-md);
}

.explorer-item {
  background: var(--bg-tertiary);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  transition: all 0.2s;
}

.explorer-item.unlocked {
  border-color: var(--accent-blue);
  background: rgba(88, 166, 255, 0.05);
}

.explorer-item.readonly {
  opacity: 0.85;
  background: var(--bg-secondary);
}

.explorer-item.readonly .explorer-input {
  background: var(--bg-secondary);
  cursor: not-allowed;
}

.explorer-item.abnormal-low {
  border-color: rgba(88, 166, 255, 0.5);
  background: rgba(88, 166, 255, 0.08);
}

.explorer-item.abnormal-high {
  border-color: rgba(248, 81, 73, 0.5);
  background: rgba(248, 81, 73, 0.08);
}

.explorer-item.normal {
  border-color: rgba(63, 185, 80, 0.3);
}

.explorer-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-sm);
}

.explorer-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.lock-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: var(--space-xs);
  border-radius: var(--radius-sm);
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lock-btn:hover {
  background: rgba(88, 166, 255, 0.1);
  color: var(--accent-blue);
}

.lock-btn.locked {
  color: var(--text-muted);
}

.lock-btn.unlocked {
  color: var(--accent-blue);
}

.explorer-input {
  width: 100%;
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: var(--space-sm);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: var(--space-xs);
  transition: all 0.2s;
}

.explorer-input:focus {
  outline: none;
  border-color: var(--accent-blue);
  background: rgba(88, 166, 255, 0.05);
}

.explorer-input[readonly] {
  cursor: default;
  opacity: 0.7;
}

.explorer-item.unlocked .explorer-input {
  border-color: var(--accent-blue);
  background: rgba(88, 166, 255, 0.05);
}

.explorer-range {
  display: block;
  font-size: 0.7rem;
  color: var(--text-muted);
  text-align: center;
}

/* Calculated Values Section */
.calculated-section {
  background: linear-gradient(135deg, 
    rgba(88, 166, 255, 0.05) 0%, 
    rgba(163, 113, 247, 0.05) 100%);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  border: none;
}

.calculated-section h3 {
  color: var(--accent-purple);
}

.calculated-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: var(--space-md);
}

.calculated-item {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  text-align: center;
  transition: all 0.2s;
}

.calculated-item.abnormal-low {
  border-color: var(--accent-blue);
  background: rgba(88, 166, 255, 0.1);
}

.calculated-item.abnormal-high {
  border-color: var(--accent-red);
  background: rgba(248, 81, 73, 0.1);
}

.calculated-item.normal {
  border-color: rgba(63, 185, 80, 0.3);
}

.calculated-label {
  display: block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

.calculated-value {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.calculated-unit {
  display: block;
  font-size: 0.7rem;
  color: var(--text-muted);
}