/* ======================================
   ERPL Testing Analysis App - Web Version
   Global Styles with Modern Dark Theme
   ====================================== */

/* CSS Variables for Consistent Theming */
:root {
  /* Colors */
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: #16162a;
  --bg-hover: #252545;

  --accent-primary: #667eea;
  --accent-secondary: #764ba2;
  --accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --accent-glow: rgba(102, 126, 234, 0.3);

  --text-primary: #ffffff;
  --text-secondary: #b8b8d4;
  --text-muted: #6b6b8a;

  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --info: #3b82f6;

  --border-color: rgba(255, 255, 255, 0.1);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 4px 20px var(--accent-glow);

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;
}

/* ========== Reset & Base ========== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: 'Inter', 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Background Animation */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(ellipse at 20% 30%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 70%, rgba(118, 75, 162, 0.15) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

/* ========== Typography ========== */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

h5 {
  font-size: 1rem;
}

p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-secondary);
}

/* ========== Layout ========== */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

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

.main-content {
  flex: 1;
  padding: var(--spacing-xl) 0;
}

/* ========== Navigation ========== */
.nav-header {
  background: rgba(22, 22, 42, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  height: 40px;
  width: auto;
}

.nav-home-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-hover);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.nav-home-btn:hover {
  background: var(--accent-gradient);
  border-color: transparent;
  transform: translateY(-2px);
}

/* ========== Cards & Panels ========== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow);
  transition: all var(--transition-normal);
}

.card:hover {
  border-color: rgba(102, 126, 234, 0.3);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.panel-header {
  background: linear-gradient(135deg, var(--bg-hover) 0%, var(--bg-secondary) 100%);
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
}

.panel-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0;
}

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

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--accent-gradient);
  color: white;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px var(--accent-glow);
}

.btn-secondary {
  background: var(--bg-hover);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-card);
  border-color: var(--accent-primary);
}

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

.btn-success:hover:not(:disabled) {
  background: #0ea572;
  transform: translateY(-2px);
}

.btn-large {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1.1rem;
  border-radius: var(--radius-lg);
}

.btn-icon {
  font-size: 1.2rem;
}

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
}

/* ========== Forms ========== */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-xs);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
}

.form-input,
.form-select {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-input::placeholder {
  color: var(--text-muted);
}

.form-select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23b8b8d4' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

/* Range Slider */
.form-range {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--bg-primary);
  border-radius: 3px;
  cursor: pointer;
}

.form-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  background: var(--accent-gradient);
  border-radius: 50%;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.form-range::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.form-range::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: var(--accent-primary);
  border-radius: 50%;
  cursor: pointer;
  border: none;
}

.range-value {
  display: inline-block;
  min-width: 40px;
  text-align: center;
  font-weight: 600;
  color: var(--accent-primary);
}

/* File Input */
.file-input-wrapper {
  position: relative;
  display: inline-block;
}

.file-input {
  position: absolute;
  opacity: 0;
  width: 100%;
  height: 100%;
  cursor: pointer;
}

.file-input-label {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  background: var(--bg-hover);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.file-input-label:hover {
  border-color: var(--accent-primary);
  color: var(--text-primary);
}

.file-name {
  color: var(--success);
  font-size: 0.9rem;
  margin-left: var(--spacing-md);
}

/* Checkbox */
.checkbox-wrapper {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
}

.checkbox-input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent-primary);
  cursor: pointer;
}

/* ========== Chart Container ========== */
.chart-container {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  position: relative;
  min-height: 400px;
}

.chart-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--bg-hover);
  border-radius: var(--radius-md);
}

.chart-info {
  padding: var(--spacing-md);
  background: var(--bg-hover);
  border-radius: var(--radius-md);
  margin-top: var(--spacing-md);
  text-align: center;
}

.chart-avg-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-primary);
}

/* ========== Modals ========== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  max-width: 90%;
  max-height: 90vh;
  overflow: auto;
  box-shadow: var(--shadow);
  transform: scale(0.9);
  transition: transform var(--transition-normal);
}

.modal-overlay.active .modal {
  transform: scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.modal-close:hover {
  color: var(--text-primary);
}

.modal-body {
  padding: var(--spacing-lg);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
}

/* ========== Metrics Display ========== */
.metrics-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.metric-card {
  background: var(--bg-hover);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  text-align: center;
}

.metric-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: var(--spacing-xs);
}

.metric-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--success);
}

/* ========== Grid Layouts ========== */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-md);
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.flex-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

/* ========== Launcher Page Specific ========== */
.launcher-hero {
  text-align: center;
  padding: var(--spacing-2xl) 0;
}

.launcher-logo {
  width: 240px;
  max-width: 80%;
  margin-bottom: var(--spacing-xl);
}

.launcher-title {
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-sm);
}

.launcher-subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
  margin-bottom: var(--spacing-2xl);
}

.launcher-buttons {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  max-width: 400px;
  margin: 0 auto;
}

.launcher-btn {
  width: 100%;
  padding: var(--spacing-lg) var(--spacing-xl);
  font-size: 1.1rem;
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.launcher-btn:hover {
  background: var(--accent-gradient);
  border-color: transparent;
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.launcher-btn-icon {
  font-size: 1.5rem;
}

.launcher-footer {
  text-align: center;
  padding: var(--spacing-xl) 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ========== Quick Plots Section ========== */
.quick-plots-section {
  margin-top: var(--spacing-xl);
}

.quick-plots-title {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.quick-plots-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-sm);
}

.plot-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.9rem;
}

/* ========== Two Column Layout ========== */
.two-column-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
}

/* ========== Section Styling ========== */
.section {
  margin-bottom: var(--spacing-xl);
}

.section-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.section-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: var(--accent-gradient);
  border-radius: 50%;
  font-size: 0.8rem;
  font-weight: 700;
}

/* ========== Result Display ========== */
.result-display {
  text-align: center;
  padding: var(--spacing-lg);
  background: linear-gradient(135deg, var(--bg-hover) 0%, var(--bg-card) 100%);
  border-radius: var(--radius-lg);
  margin-top: var(--spacing-md);
}

.result-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: var(--spacing-xs);
}

.result-value {
  font-size: 2rem;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.result-unit {
  font-size: 1rem;
  color: var(--text-secondary);
}

/* ========== Equation Box ========== */
.equation-box {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  text-align: center;
  margin-bottom: var(--spacing-md);
}

.equation-main {
  font-size: 1.3rem;
  font-family: 'Times New Roman', serif;
  font-style: italic;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.equation-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ========== Placeholder/Coming Soon ========== */
.coming-soon {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 400px;
  text-align: center;
}

.coming-soon-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-lg);
}

.coming-soon-title {
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
}

.coming-soon-text {
  color: var(--text-muted);
  font-size: 1.1rem;
}

/* ========== Responsive ========== */
@media (max-width: 1024px) {
  .two-column-layout {
    grid-template-columns: 1fr;
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .launcher-title {
    font-size: 1.8rem;
  }

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }

  .chart-controls {
    flex-direction: column;
    align-items: stretch;
  }

  .modal {
    max-width: 95%;
    margin: var(--spacing-md);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .launcher-logo {
    width: 180px;
  }

  .btn-large {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 1rem;
  }
}

/* ========== Animations ========== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.5;
  }
}

.fade-in {
  animation: fadeIn 0.5s ease forwards;
}

.loading {
  animation: pulse 1.5s infinite;
}

/* ========== Scrollbar Styling ========== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

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

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-primary);
}

/* ========== Instructions Content ========== */
.instructions-content {
  max-width: 700px;
  margin: 0 auto;
}

.instructions-content ol {
  padding-left: var(--spacing-lg);
}

.instructions-content li {
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

/* ========== Toast Notifications ========== */
.toast-container {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.toast {
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  animation: fadeIn 0.3s ease;
}

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

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

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

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

/* ========== Constant Line Items ========== */
.constant-line-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-xs);
  font-size: 0.9rem;
}

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

.btn-small {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
}