/* ==========================================================================
   AeroPID Pro - Google-Esque Calm Aesthetic Design System
   Clean, minimal, high-legibility interface inspired by Google Cloud & Workspace
   ========================================================================== */

:root {
  --bg-page: #f8fafd;
  --bg-surface: #ffffff;
  --bg-subtle: #f0f4f9;
  --bg-hover: #e8ecf2;
  --bg-input: #ffffff;

  --border-color: #e0e3e7;
  --border-subtle: #edeef0;
  --border-focus: #1a73e8;

  --text-primary: #1f1f1f;
  --text-secondary: #444746;
  --text-muted: #747775;

  /* Google Palette */
  --google-blue: #0b57d0;
  --google-blue-light: #1a73e8;
  --google-blue-container: #e8f0fe;
  --google-blue-text: #174ea6;

  --google-green: #137333;
  --google-green-container: #e6f4ea;
  --google-green-text: #0d652d;

  --google-amber: #b06000;
  --google-amber-container: #fef7e0;
  --google-amber-text: #8c4d00;

  --google-red: #c5221f;
  --google-red-container: #fce8e6;
  --google-red-text: #a51d24;

  --google-purple: #8430ce;
  --google-purple-container: #f3e8fd;
  --google-purple-text: #621b96;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 9999px;

  --shadow-sm: 0 1px 2px 0 rgba(60, 64, 67, 0.08), 0 1px 3px 1px rgba(60, 64, 67, 0.04);
  --shadow-card: 0 1px 3px 0 rgba(60, 64, 67, 0.1), 0 2px 8px 1px rgba(60, 64, 67, 0.04);
  --shadow-hover: 0 2px 6px 0 rgba(60, 64, 67, 0.12), 0 4px 12px 2px rgba(60, 64, 67, 0.06);

  --font-sans: 'Google Sans', 'Roboto', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Roboto Mono', 'SF Mono', Menlo, Consolas, monospace;
}

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

body {
  background-color: var(--bg-page);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Header */
.app-header {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 0.85rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 2px rgba(60, 64, 67, 0.03);
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.brand-icon {
  width: 38px;
  height: 38px;
  background: var(--google-blue-container);
  border: 1px solid rgba(11, 87, 208, 0.15);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-title {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.2px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand-title .badge {
  font-size: 0.7rem;
  font-weight: 500;
  font-family: var(--font-sans);
  background: var(--bg-subtle);
  color: var(--text-secondary);
  padding: 0.15rem 0.55rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-color);
}

.brand-subtitle {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.header-status-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.status-pill {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  background: var(--bg-subtle);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-subtle);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--google-green);
}

.status-dot.idle {
  background: var(--text-muted);
}

.status-dot.warning {
  background: var(--google-amber);
}

.header-actions {
  display: flex;
  gap: 0.65rem;
}

/* Google Material Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  font-family: var(--font-sans);
  text-decoration: none;
}

.btn-primary {
  background: var(--google-blue);
  color: #ffffff;
  box-shadow: 0 1px 2px rgba(11, 87, 208, 0.2);
}

.btn-primary:hover {
  background: #0842a0;
  box-shadow: 0 2px 4px rgba(11, 87, 208, 0.3);
}

.btn-outline {
  background: var(--bg-surface);
  border-color: var(--border-color);
  color: var(--text-secondary);
}

.btn-outline:hover {
  background: var(--bg-subtle);
  color: var(--text-primary);
  border-color: #c4c7c5;
}

.btn-sm {
  padding: 0.35rem 0.85rem;
  font-size: 0.8rem;
}

/* Layout */
.app-container {
  max-width: 1440px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem 2rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Top Upload & Scenario Bar */
.top-action-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.drop-zone {
  border: 2px dashed #c4c7c5;
  border-radius: var(--radius-md);
  padding: 1.5rem 1.25rem;
  text-align: center;
  background: #fafcff;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
}

.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--google-blue);
  background: var(--google-blue-container);
}

.drop-zone-icon {
  width: 36px;
  height: 36px;
  color: var(--google-blue);
}

.drop-zone-title {
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--text-primary);
}

.drop-zone-subtitle {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.scenario-picker {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.75rem;
}

.scenario-header {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.scenario-buttons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 0.55rem;
}

.scenario-btn {
  background: var(--bg-subtle);
  border: 1px solid transparent;
  color: var(--text-primary);
  border-radius: var(--radius-pill);
  padding: 0.6rem 1rem;
  text-align: left;
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.scenario-btn:hover {
  background: var(--bg-hover);
}

.scenario-btn.active {
  background: var(--google-blue-container);
  border-color: rgba(11, 87, 208, 0.3);
  color: var(--google-blue-text);
}

.scenario-btn-title {
  font-size: 0.82rem;
  font-weight: 600;
}

.scenario-btn-desc {
  font-size: 0.72rem;
  color: var(--text-secondary);
}

.scenario-btn.active .scenario-btn-desc {
  color: var(--google-blue-text);
  opacity: 0.85;
}

/* Material Tab Navigation */
.nav-tabs {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0;
  overflow-x: auto;
}

.tab-btn {
  background: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 500;
  padding: 0.75rem 1.25rem;
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
  border-radius: 4px 4px 0 0;
}

.tab-btn:hover {
  color: var(--text-primary);
  background: rgba(0, 0, 0, 0.02);
}

.tab-btn.active {
  color: var(--google-blue);
  border-bottom-color: var(--google-blue);
  font-weight: 600;
}

/* Tab Panes */
.tab-content {
  display: none;
  animation: fadeIn 0.2s ease forwards;
}

.tab-content.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(2px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Diagnostics & Recommender Dashboard */
.diag-dashboard {
  display: grid;
  grid-template-columns: 310px 1fr;
  gap: 1.5rem;
}

.scorecard-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
}

.overall-score-box {
  text-align: center;
  padding: 1.75rem 1.25rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
}

.score-circle {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  border: 5px solid var(--google-blue);
  background: #fafcff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.5rem;
}

.score-num {
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
}

.score-max {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.score-title {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text-primary);
}

.score-desc {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.submetric-list {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.submetric-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border-subtle);
}

.submetric-item:last-child {
  border-bottom: none;
}

.submetric-label {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.submetric-value {
  font-size: 0.85rem;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--text-primary);
}

/* Findings & Diagnosis Cards */
.diag-main {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.findings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 0.85rem;
}

.finding-card {
  border-radius: var(--radius-md);
  padding: 1rem 1.2rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--google-blue);
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.finding-card.danger {
  border-left-color: var(--google-red);
  background: var(--google-red-container);
  border-color: rgba(197, 34, 31, 0.2);
}

.finding-card.warning {
  border-left-color: var(--google-amber);
  background: var(--google-amber-container);
  border-color: rgba(176, 96, 0, 0.2);
}

.finding-card.success {
  border-left-color: var(--google-green);
  background: var(--google-green-container);
  border-color: rgba(19, 115, 51, 0.2);
}

.finding-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
}

.finding-card.danger .finding-title { color: var(--google-red-text); }
.finding-card.warning .finding-title { color: var(--google-amber-text); }
.finding-card.success .finding-title { color: var(--google-green-text); }

.finding-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.finding-card.danger .finding-desc { color: #5f1515; }
.finding-card.warning .finding-desc { color: #523000; }
.finding-card.success .finding-desc { color: #0a441e; }

/* Diff Table */
.diff-table-card {
  overflow: hidden;
}

.card-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.diff-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.85rem;
}

.diff-table th {
  background: var(--bg-subtle);
  color: var(--text-secondary);
  font-weight: 600;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.diff-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-primary);
}

.diff-table tr:hover td {
  background: #f8fafd;
}

.val-current {
  font-family: var(--font-mono);
  color: var(--text-secondary);
}

.val-rec {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-primary);
}

.delta-badge {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-pill);
  display: inline-block;
}

.delta-badge.increase {
  background: var(--google-green-container);
  color: var(--google-green-text);
  border: 1px solid rgba(19, 115, 51, 0.2);
}

.delta-badge.decrease {
  background: var(--google-red-container);
  color: var(--google-red-text);
  border: 1px solid rgba(197, 34, 31, 0.2);
}

.delta-badge.unchanged {
  color: var(--text-muted);
}

/* CLI Export Box */
.cli-box {
  background: #202124;
  border: 1px solid #303134;
  border-radius: var(--radius-md);
  padding: 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: #e8eaed;
  line-height: 1.5;
  max-height: 220px;
  overflow-y: auto;
  white-space: pre-wrap;
  user-select: all;
}

/* Chart Canvas Grid */
.charts-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.charts-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.chart-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  box-shadow: var(--shadow-card);
}

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

.chart-canvas-container {
  width: 100%;
  height: 260px;
  position: relative;
  background: #ffffff;
  border-radius: var(--radius-sm);
}

.chart-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.chart-stat-bar {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  background: var(--bg-subtle);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.85rem;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
}

.chart-stat-bar span strong {
  color: var(--text-primary);
}

/* Simulator Controls */
.sim-container {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 1.5rem;
}

.sim-controls-card {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.slider-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.slider-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--text-primary);
}

.slider-val-badge {
  font-family: var(--font-mono);
  color: var(--google-blue-text);
  background: var(--google-blue-container);
  padding: 0.12rem 0.45rem;
  border-radius: var(--radius-sm);
  font-size: 0.76rem;
  font-weight: 600;
}

.slider-input {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: var(--radius-pill);
  background: #dadce0;
  outline: none;
  border: none;
}

.slider-input::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--google-blue);
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
  transition: transform 0.1s ease;
}

.slider-input::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

/* Config & Diff Parser Tab */
.config-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1.1rem;
}

.form-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-input, .form-select, .form-textarea {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.85rem;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-textarea {
  font-family: var(--font-mono);
  resize: vertical;
  min-height: 140px;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--google-blue);
  box-shadow: 0 0 0 2px rgba(11, 87, 208, 0.15);
}

/* Symptoms Checkboxes */
.symptoms-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
  margin-top: 0.5rem;
}

.checkbox-card {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.85rem;
  cursor: pointer;
  font-size: 0.82rem;
  color: var(--text-primary);
  transition: all 0.15s ease;
}

.checkbox-card:hover {
  background: var(--bg-hover);
  border-color: var(--border-color);
}

.checkbox-card input[type="checkbox"] {
  accent-color: var(--google-blue);
  width: 16px;
  height: 16px;
}

/* Toast notification */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: #323232;
  color: #ffffff;
  padding: 0.85rem 1.4rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.25);
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1000;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

/* Footer */
.app-footer {
  border-top: 1px solid var(--border-color);
  padding: 1.25rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.78rem;
  color: var(--text-muted);
  background: var(--bg-surface);
}

/* Drone Hardware Specifications & Physics Model Card */
.drone-specs-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.15rem 1.4rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease;
}

.drone-specs-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.9rem;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.drone-specs-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.drone-specs-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.drone-specs-badge {
  font-size: 0.72rem;
  font-weight: 500;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-pill);
  background: var(--google-blue-container);
  color: var(--google-blue-text);
  border: 1px solid rgba(11, 87, 208, 0.18);
}

.drone-specs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.spec-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.spec-field-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--text-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.spec-field-hint {
  font-size: 0.7rem;
  font-weight: 400;
  color: var(--text-muted);
}

.spec-input-group {
  position: relative;
  display: flex;
  align-items: center;
}

.spec-input {
  width: 100%;
  padding: 0.55rem 0.85rem;
  padding-right: 2.2rem;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-primary);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.spec-input:focus {
  outline: none;
  border-color: var(--google-blue);
  box-shadow: 0 0 0 2px var(--google-blue-container);
}

.spec-unit {
  position: absolute;
  right: 0.75rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
  pointer-events: none;
}

.prop-chips {
  display: flex;
  gap: 0.35rem;
  margin-top: 0.4rem;
  flex-wrap: wrap;
}

.chip-btn {
  padding: 0.2rem 0.55rem;
  font-size: 0.72rem;
  font-weight: 500;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-pill);
  background: var(--bg-subtle);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
}

.chip-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: #c4c7c5;
}

.chip-btn.active {
  background: var(--google-blue-container);
  color: var(--google-blue-text);
  border-color: rgba(11, 87, 208, 0.3);
  font-weight: 600;
}

/* Responsive */
@media (max-width: 1024px) {
  .top-action-card, .diag-dashboard, .charts-grid-2, .charts-grid-3, .sim-container, .config-layout {
    grid-template-columns: 1fr;
  }
}