/* Lat Long Distance Calculator - Modern Geodesy Calculator Styles */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #1a1a25;
  --bg-card-hover: #22222f;
  --text-primary: #f0f0f5;
  --text-secondary: #a0a0b0;
  --text-muted: #606070;
  --accent-primary: #60a5fa;
  --accent-secondary: #a78bfa;
  --accent-gradient: var(--accent-primary);
  --success: #34d399;
  --warning: #fbbf24;
  --error: #f87171;
  --border-color: rgba(255, 255, 255, 0.08);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
[data-theme="light"] {
  --bg-primary: #f5f7fa;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f0f4f8;
  --text-primary: #1a1a2e;
  --text-secondary: #4a4a5a;
  --text-muted: #8a8a9a;
  --border-color: rgba(0, 0, 0, 0.1);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.1);
}
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  font-size: 16px;
  scroll-behavior: smooth;
}
body {
  font-family:
    "Inter",
    -apple-system,
    BlinkMacSystemFont,
    sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}
/* Background removed for cleaner interface */
/* App Container */
.app-container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-rows: auto 1fr auto;
  grid-template-columns: 1fr auto;
  min-height: 100vh;
  max-width: 1600px;
  margin: 0 auto;
  padding: 1rem;
  gap: 1rem;
}
/* Header */
.header {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 1rem 1.5rem;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
}
.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.logo-icon {
  font-size: 2.5rem;
}
.logo-text h1 {
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.tagline {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.nav-tabs {
  display: flex;
  gap: 0.5rem;
  flex: 1;
  flex-wrap: wrap;
  justify-content: center;
}
.nav-tab {
  padding: 0.6rem 1.2rem;
  border: none;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}
.nav-tab:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
}
.nav-tab.active {
  background: var(--accent-gradient);
  color: white;
  box-shadow: none;
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.settings-dropdown {
  position: relative;
}
.settings-toggle,
.theme-toggle {
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background: var(--bg-card-hover);
  font-size: 1.25rem;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}
.settings-toggle:hover,
.theme-toggle:hover {
  transform: scale(1.1);
  background: var(--bg-secondary);
}
.settings-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  width: 220px;
  box-shadow: var(--shadow-lg);
  display: none;
  z-index: 1001;
}
.settings-menu.show {
  display: block;
  animation: slideDown 0.2s ease-out;
}
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}
.setting-item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.setting-item label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
}
.setting-item select {
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  font-family: inherit;
}
/* Main Content */
.main-content {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  padding: 2rem;
  overflow-y: auto;
}
.section-header {
  margin-bottom: 2rem;
  text-align: center;
}
.section-header h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  background: var(--accent-gradient);
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.section-description {
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}
/* Calculator Grid */
.calculator-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}
.input-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  padding: 1.5rem;
  transition: var(--transition);
}
.input-card:hover {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-md);
}
.card-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}
.card-icon {
  font-size: 1.5rem;
}
.card-header h3 {
  font-size: 1.1rem;
  font-weight: 600;
}
.loc-btn {
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: var(--transition);
  margin-left: auto;
}
.loc-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--accent-primary);
}
.input-group {
  margin-bottom: 1rem;
}
.input-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}
.input-group input,
.input-group select {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: "JetBrains Mono", monospace;
  transition: var(--transition);
}
.input-group input:focus,
.input-group select:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: none;
}
input.invalid {
  border-color: #ef4444 !important;
  background-color: rgba(239, 68, 68, 0.05);
}
input.invalid:focus {
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.2);
}
.input-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
  display: block;
}
.input-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.input-with-unit {
  display: flex;
  gap: 0.5rem;
}
.input-with-unit input {
  flex: 1;
}
.input-with-unit select {
  width: 90px;
}
/* Action Bar */
.action-bar {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 2rem;
}
.btn-primary,
.btn-secondary {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.9rem 1.8rem;
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.btn-primary {
  background: var(--accent-gradient);
  color: white;
  box-shadow: none;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: none;
}
.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}
.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-primary);
}
/* Results Panel */
.results-panel {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}
.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}
.results-header h3 {
  font-size: 1.1rem;
  font-weight: 600;
}
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}
.result-item {
  background: var(--bg-primary);
  padding: 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}
.result-item.highlight {
  border-color: var(--accent-primary);
  background: rgba(96, 165, 250, 0.05);
}
.result-label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}
.result-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  font-family: "JetBrains Mono", monospace;
}
.unit-toggles {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}
.toggle-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.toggle-group {
  display: flex;
  gap: 0.25rem;
}
.unit-btn {
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition);
}
.unit-btn.active,
.unit-btn:hover {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
}
/* Slider */
.intermediate-slider {
  background: var(--bg-card);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  margin-bottom: 1.5rem;
}
.intermediate-slider label {
  display: block;
  margin-bottom: 1rem;
  font-weight: 500;
}
.intermediate-slider input[type="range"] {
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: var(--bg-primary);
  appearance: none;
  cursor: pointer;
}
.intermediate-slider input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent-gradient);
  cursor: pointer;
  box-shadow: none;
}
.slider-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}
/* Info Banner */
.info-banner {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  background: rgba(96, 165, 250, 0.1);
  border: 1px solid rgba(96, 165, 250, 0.3);
  border-radius: var(--radius-md);
  padding: 1rem;
  margin-bottom: 1.5rem;
}
.info-icon {
  font-size: 1.25rem;
}
.info-banner p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}
/* Comparison Bar */
.comparison-bar {
  margin-top: 1rem;
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  background: rgba(251, 191, 36, 0.1);
  border: 1px solid rgba(251, 191, 36, 0.3);
  text-align: center;
}
.comparison-label {
  font-size: 0.9rem;
  color: var(--warning);
}
/* Compass */
.compass-display {
  display: flex;
  justify-content: center;
  margin-top: 1.5rem;
}
.compass {
  position: relative;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 3px solid var(--border-color);
}
.compass-ring {
  position: absolute;
  inset: 10px;
  border-radius: 50%;
  border: 2px dashed var(--border-color);
}
.compass-needle {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 4px;
  height: 70px;
  margin-left: -2px;
  margin-top: -60px;
  background: linear-gradient(
    to bottom,
    var(--error) 50%,
    var(--text-muted) 50%
  );
  border-radius: 2px;
  transform-origin: center 60px;
  transition: transform 0.5s ease-out;
}
.compass-center {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 12px;
  height: 12px;
  margin: -6px;
  background: var(--text-primary);
  border-radius: 50%;
}
.compass-n,
.compass-e,
.compass-s,
.compass-w {
  position: absolute;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text-secondary);
}
.compass-n {
  top: 5px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--error);
}
.compass-s {
  bottom: 5px;
  left: 50%;
  transform: translateX(-50%);
}
.compass-e {
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
}
.compass-w {
  left: 8px;
  top: 50%;
  transform: translateY(-50%);
}
/* Formula Panel */
.formula-panel {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  padding: 1rem;
  width: 300px;
  transition: var(--transition);
}
.formula-panel.collapsed {
  width: 50px;
}
.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}
.panel-toggle {
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 50%;
  background: var(--bg-card);
  cursor: pointer;
  color: var(--text-secondary);
  transition: var(--transition);
}
.panel-toggle:hover {
  background: var(--bg-card-hover);
}
.formula-card {
  background: var(--bg-card);
  padding: 1rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
  border: 1px solid var(--border-color);
}
.formula-card h4 {
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
  color: var(--accent-primary);
}
.formula {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.8rem;
  color: var(--text-primary);
  line-height: 1.8;
}
.formula-note {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}
/* Footer */
.footer {
  grid-column: 1 / -1;
  text-align: center;
  padding: 1rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}
.footer a {
  color: var(--accent-primary);
  text-decoration: none;
}
.footer a:hover {
  text-decoration: underline;
}
.disclaimer {
  font-size: 0.75rem;
  margin-top: 0.25rem;
}
/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--success);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 500;
  transition: transform 0.3s ease;
  z-index: 1000;
}
.toast.show {
  transform: translateX(-50%) translateY(0);
}
/* Responsive */
@media (max-width: 1200px) {
  .formula-panel {
    display: none;
  }
  .app-container {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .app-container {
    padding: 0.5rem;
    gap: 0.5rem;
  }
  
  .header {
    flex-direction: column;
    padding: 1rem;
    gap: 1rem;
    border-radius: var(--radius-md);
  }

  .logo {
    flex-direction: row;
    justify-content: center;
    width: 100%;
  }

  .nav-tabs {
    width: 100%;
    overflow-x: auto;
    justify-content: flex-start;
    padding-bottom: 5px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none; /* Hide scrollbar for Firefox */
  }

  .nav-tabs::-webkit-scrollbar {
    display: none; /* Hide scrollbar for Chrome/Safari */
  }

  .nav-tab {
    white-space: nowrap;
    padding: 0.5rem 0.8rem;
    flex-shrink: 0;
  }

  .main-content {
    padding: 1.25rem 1rem;
    border-radius: var(--radius-md);
  }

  .section-header h2 {
    font-size: 1.5rem;
  }

  .calculator-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .input-row {
    grid-template-columns: 1fr;
  }

  .results-grid {
    grid-template-columns: 1fr;
  }

  .action-bar {
    flex-direction: column;
    width: 100%;
  }

  .btn-primary, .btn-secondary {
    width: 100%;
    justify-content: center;
  }
}