@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:ital,wght@0,400;0,500;0,600;0,700;1,400&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap");

:root {
  --primary-teal: #0f7e9b;
  --primary-teal-dark: #095f76;
  --primary-teal-light: #e6f4f8;
  --primary-teal-border: #a9c4cf;

  --accent-amber: #d67b19;
  --accent-amber-dark: #b06210;
  --accent-amber-light: #fdf3e8;
  --accent-amber-border: #f2cca1;

  --bg-950: #e9f4fb;
  --bg-900: #fff4dd;
  --bg-800: #ffffff;
  --surface: rgba(255, 255, 255, 0.96);
  --surface-alt: rgba(247, 252, 255, 0.98);

  --ink: #123140;
  --muted: #4b6570;
  --subtle: #7a94a0;
  --border: #c8dbe3;
  --border-light: #e2eef3;

  --success: #1a7f4e;
  --success-bg: #ecfdf5;
  --success-border: #a7f3d0;

  --error: #dc2626;
  --error-bg: #fef2f2;
  --error-border: #fecaca;

  --shadow-sm: 0 2px 6px rgba(12, 54, 68, 0.05);
  --shadow-md: 0 6px 16px rgba(12, 54, 68, 0.08);
  --shadow-lg: 0 12px 24px rgba(12, 54, 68, 0.12);

  --app-bg:
    radial-gradient(1200px 700px at 8% 2%, rgba(19, 143, 176, 0.18), transparent 62%),
    radial-gradient(900px 600px at 92% 98%, rgba(220, 132, 32, 0.18), transparent 66%),
    linear-gradient(165deg, #e9f4fb, #fff4dd);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
}

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

html, body {
  min-height: 100%;
}

body {
  font-family: "Inter", "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--app-bg);
  color: var(--ink);
  line-height: 1.45;
  padding-bottom: 3rem;
  overflow-x: hidden;
}

/* Background blueprint grid matching Hub */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(15, 126, 155, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(214, 123, 25, 0.06) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(circle at center, black 42%, transparent 95%);
}

.math-expr {
  font-family: "IBM Plex Sans", "Cambria Math", "Times New Roman", serif;
  font-style: italic;
  letter-spacing: 0.02em;
}

.shell {
  width: min(1440px, calc(100% - 2rem));
  margin-inline: auto;
  padding-top: 1rem;
}

/* Header matching Hub Card Hero */
.hero {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.2rem 1.4rem;
  background: linear-gradient(160deg, #ffffff, #f7fbfd);
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
  margin-bottom: 1rem;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 12px;
  background: var(--primary-teal);
  border-radius: 14px 0 0 14px;
}

.hero-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1rem;
  padding-left: 0.4rem;
}

.brand-badge {
  display: inline-block;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  color: var(--primary-teal-dark);
  padding: 0.2rem 0.65rem;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.25rem;
  text-decoration: none;
}

.lab-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-amber-dark);
  background: var(--accent-amber-light);
  border: 1px solid var(--accent-amber-border);
  padding: 0.2rem 0.65rem;
  border-radius: 6px;
  letter-spacing: 0.05em;
  margin-left: 0.4rem;
}

.hero h1 {
  font-size: clamp(1.4rem, 2.2vw, 1.9rem);
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-top: 0.2rem;
}

.hero-subtitle {
  color: var(--muted);
  font-size: 0.92rem;
  margin-top: 0.25rem;
  max-width: 90ch;
}

.meta-badge {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 600;
}

/* Scenario Selector Nav Tabs */
.scenario-nav {
  display: flex;
  gap: 0.4rem;
  overflow-x: auto;
  padding: 0.4rem;
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  margin-bottom: 1rem;
  scrollbar-width: thin;
}

.scenario-tab {
  flex: 1;
  min-width: 170px;
  background: transparent;
  border: 1px solid transparent;
  color: var(--muted);
  padding: 0.65rem 0.9rem;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.scenario-tab:hover {
  background: var(--primary-teal-light);
  color: var(--primary-teal-dark);
}

.scenario-tab.active {
  background: var(--primary-teal);
  color: #ffffff;
  border-color: var(--primary-teal-dark);
  box-shadow: 0 2px 8px rgba(15, 126, 155, 0.25);
}

/* Scenario Banner / Description Panel */
.scenario-banner {
  background: #ffffff;
  border: 1px solid var(--border);
  border-left: 6px solid var(--primary-teal);
  border-radius: var(--radius-md);
  padding: 1rem 1.4rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.scenario-banner-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 0.2rem;
}

.scenario-banner-desc {
  font-size: 0.92rem;
  color: var(--muted);
}

/* Grid Layout */
.main-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 1.25rem;
  align-items: start;
}

@media (max-width: 1100px) {
  .main-grid {
    grid-template-columns: 1fr;
  }
}

/* Panels and Cards */
.panel {
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.2rem;
  box-shadow: var(--shadow-md);
  margin-bottom: 1.25rem;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.85rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.panel-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Canvas Wrappers */
.canvas-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  position: relative;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.02);
}

canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* Controls Bar */
.controls-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-top: 0.75rem;
}

.playback-buttons {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.84rem;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.18s ease;
  user-select: none;
  font-family: inherit;
}

.btn-primary {
  background: var(--primary-teal);
  color: #ffffff;
  border-color: var(--primary-teal-dark);
}

.btn-primary:hover {
  background: var(--primary-teal-dark);
  box-shadow: 0 2px 6px rgba(15, 126, 155, 0.3);
}

.btn-accent {
  background: var(--accent-amber);
  color: #ffffff;
  border-color: var(--accent-amber-dark);
}

.btn-accent:hover {
  background: var(--accent-amber-dark);
  box-shadow: 0 2px 6px rgba(214, 123, 25, 0.3);
}

.btn-ghost {
  background: var(--surface-alt);
  border-color: var(--border);
  color: var(--muted);
}

.btn-ghost:hover {
  background: #ffffff;
  color: var(--ink);
  border-color: var(--primary-teal);
}

.btn-sm {
  padding: 0.3rem 0.6rem;
  font-size: 0.78rem;
}

/* Data Tables */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: #ffffff;
}

table.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.84rem;
}

table.data-table th {
  background: var(--primary-teal-light);
  color: var(--primary-teal-dark);
  font-weight: 700;
  padding: 8px 12px;
  border-bottom: 2px solid var(--border);
  white-space: nowrap;
}

table.data-table td {
  padding: 6px 12px;
  border-bottom: 1px solid var(--border-light);
  color: var(--ink);
  vertical-align: middle;
}

table.data-table tr:nth-child(even) {
  background: var(--surface-alt);
}

table.data-table tr:hover {
  background: rgba(15, 126, 155, 0.04);
}

table.data-table input[type="number"],
table.data-table input[type="text"] {
  width: 100%;
  padding: 4px 6px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.82rem;
  color: var(--ink);
  background: #ffffff;
}

table.data-table input:focus {
  outline: none;
  border-color: var(--accent-amber);
  box-shadow: 0 0 0 2px rgba(214, 123, 25, 0.15);
}

/* Callout Boxes */
.callout {
  border-left: 4px solid var(--primary-teal);
  background: var(--primary-teal-light);
  padding: 12px 16px;
  border-radius: 0 8px 8px 0;
  margin-bottom: 1rem;
  font-size: 0.88rem;
  color: var(--ink);
}

.callout strong {
  color: var(--primary-teal-dark);
  display: block;
  margin-bottom: 4px;
  font-size: 0.92rem;
}

.callout-amber {
  border-left-color: var(--accent-amber);
  background: var(--accent-amber-light);
}

.callout-amber strong {
  color: var(--accent-amber-dark);
}

/* Uncertainty pill checkbox */
.uncertainty-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 16px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
}

.uncertainty-pill input[type="checkbox"] {
  accent-color: var(--accent-amber);
}

/* Tab Panels */
.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
  animation: fadeIn 0.2s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(3px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Lab Report Styling (3 Pages matching student PDF) */
.report-page-card {
  background: #ffffff;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  padding: 36px;
  margin-bottom: 24px;
  border-radius: var(--radius-md);
}

.report-header {
  border-bottom: 2px solid var(--primary-teal);
  padding-bottom: 10px;
  margin-bottom: 20px;
}

.report-header h2 {
  font-size: 1.45rem;
  color: var(--primary-teal);
}

.graph-paste-box {
  border: 2px dashed var(--border);
  border-radius: 8px;
  min-height: 400px;
  background: var(--surface-alt);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 16px 0;
  position: relative;
  overflow: hidden;
  padding: 12px;
}

.graph-paste-box.has-graph {
  border-style: solid;
  border-color: var(--primary-teal-border);
  background: #ffffff;
}

.analysis-comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
}

.analysis-comparison-table th,
.analysis-comparison-table td {
  border: 1px solid var(--border);
  padding: 10px 16px;
  text-align: left;
}

.analysis-comparison-table th {
  background: var(--primary-teal-light);
  color: var(--primary-teal-dark);
  font-weight: 700;
}

/* Mode Switcher Pills */
.workflow-pill-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--border);
  color: var(--muted);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.workflow-pill-btn:hover {
  background: #ffffff;
  color: var(--ink);
  border-color: var(--primary-teal);
}

.workflow-pill-btn.active {
  background: var(--primary-teal);
  color: #ffffff;
  border-color: var(--primary-teal-dark);
  box-shadow: 0 2px 6px rgba(15, 126, 155, 0.25);
}

.graph-paste-box.has-graph {
  border: 1.5px solid var(--primary-teal-border);
  background: #ffffff;
}

/* Print Mode */
@media print {
  body {
    background: #ffffff !important;
    background-image: none !important;
    color: #000000 !important;
  }

  .bg-grid,
  .hero,
  .scenario-nav,
  .scenario-banner,
  .no-print,
  .btn {
    display: none !important;
  }

  .shell {
    width: 100% !important;
    margin: 0 !important;
    padding: 0 !important;
  }

  .tab-panel {
    display: block !important;
  }

  #panelApparatus,
  #panelPhotogates,
  #panelTicker,
  #panelGraphs {
    display: none !important;
  }

  #panelReport {
    display: block !important;
  }

  .report-page-card {
    box-shadow: none !important;
    border: none !important;
    padding: 0 !important;
    page-break-after: always;
  }

  .graph-paste-box {
    border: 1px solid #333 !important;
  }
}