/* 
  index.css
  Executive English Interactive Mini-Magazines — Design System & Custom Stylesheet

  This file implements a fully responsive, single-theme editorial layout
  styled like a premium print publication (e.g., Harvard Business Review).
  All style tokens are mapped to CSS custom properties to allow live, seamless rebranding.
*/

/* ==========================================================================
   1. Typography & Web Font Imports
   ========================================================================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Lora:ital,wght@0,400;0,500;0,600;0,700;1,400&family=Playfair+Display:ital,wght@0,600;0,700;0,800;1,600&family=Outfit:wght@400;500;600;700&display=swap');

/* ==========================================================================
   2. Design Token Variables (Themes)
   ========================================================================== */

/* Brand Identity (Independent Portfolio Branding) */
body.theme-whitelabel {
  --color-primary: #064E3B;       /* Forest Emerald */
  --color-accent: #D97706;        /* Warm Amber */
  --color-accent-hover: #B45309;  /* Darker Amber */
  --color-accent-text: #B45309;   /* High-contrast Amber Ochre for AA text (5.43:1 on Sand) */
  --color-bg-paper: #FAFAF9;      /* Off-White Sand */
  --color-bg-card: #FFFFFF;
  --color-text-main: #292524;     /* Stone 800 */
  --color-text-muted: #78716C;    /* Stone 500 */
  --color-border: #E7E5E4;        /* Stone 200 */
  --color-footer-bg: #022C22;     /* Deep Emerald */
  
  --font-serif: 'Lora', Georgia, serif;
  --font-sans: 'Inter', system-ui, sans-serif;
  --font-display: 'Inter', sans-serif;
  
  --branding-title: "ELITE";
  --branding-subtitle: "Advanced English Strategic Insights";
  --branding-logo-url: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 30" width="100" height="30"><text x="10" y="22" font-family="Lora" font-weight="700" font-size="18" fill="%23D97706">E<tspan fill="%23FFFFFF">LITE</tspan></text></svg>');
}

/* ==========================================================================
   3. Global Resets & Base Styles
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  background-color: var(--color-bg-paper);
  color: var(--color-text-main);
  font-family: var(--font-sans);
  line-height: 1.7;
  overflow-x: hidden;
  transition: background-color 0.4s ease, color 0.4s ease;
}

/* Typography Scale */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  color: var(--color-primary);
  font-weight: 700;
  line-height: 1.25;
  transition: color 0.4s ease;
}

h1 { font-size: 2.75rem; }
h2 { font-size: 2rem; border-bottom: 2px solid var(--color-accent); padding-bottom: 0.5rem; margin-bottom: 1.5rem; }
h3 { font-size: 1.5rem; margin-bottom: 1rem; }
p {
  margin-bottom: 1.5rem;
  font-size: 1.08rem;
  font-weight: 400;
  line-height: 1.8;
  max-width: 68ch;
}

/* Accessibility Skip Link styling */
.skip-link {
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-accent-text);
  color: #FFFFFF;
  padding: 0.8rem 1.75rem;
  border-radius: 0 0 12px 12px;
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  z-index: 99999;
  transition: top 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
  border: 2px solid var(--color-bg-paper);
  border-top: none;
}

.skip-link:focus {
  top: 0;
  outline: 3px solid var(--color-primary);
  outline-offset: -3px;
  text-decoration: none;
  color: #FFFFFF;
}

/* Custom premium keyboard focus-visible outlines */
:focus-visible {
  outline: 3px solid var(--color-accent-text);
  outline-offset: 3px;
}

/* Specific overrides for cleaner custom outlines */
.switch input:focus-visible + .slider {
  outline: 3px solid #FFFFFF;
  outline-offset: 3px;
}

.vocab-word:focus-visible {
  outline: 2px solid var(--color-accent-text);
  outline-offset: 2px;
  border-radius: 2px;
}

.footnote-ref:focus-visible {
  outline: 2px solid var(--color-accent-text);
  outline-offset: 1px;
  border-radius: 2px;
}

a {
  color: var(--color-accent-text);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

/* ==========================================================================
   4. Layout Structure
   ========================================================================== */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Sticky Main Navigation Header */
.main-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 70px;
  background-color: var(--color-primary);
  color: #FFFFFF;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 2rem;
  z-index: 1000;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  transition: background-color 0.4s ease;
}

.logo-block {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-graphic {
  width: 100px;
  height: 30px;
  background-image: var(--branding-logo-url);
  background-repeat: no-repeat;
  background-position: left center;
  transition: background-image 0.4s ease;
}

.logo-text-holder {
  display: flex;
  flex-direction: column;
  border-left: 1px solid rgba(255, 255, 255, 0.2);
  padding-left: 0.75rem;
}

.logo-title {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.logo-subtitle {
  font-size: 0.65rem;
  color: rgba(255, 255, 255, 0.6);
  letter-spacing: 0.5px;
}

/* Interactive Controls in Header */
.header-controls {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

/* Custom Theme Switcher Toggle */
.theme-switch-wrapper {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.08);
  padding: 0.35rem 0.75rem;
  border-radius: 30px;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.theme-switch-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.8);
  letter-spacing: 0.5px;
}

.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(255, 255, 255, 0.2);
  transition: 0.4s;
  border-radius: 34px;
}

.slider::before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: var(--color-accent);
  transition: 0.4s;
  border-radius: 50%;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

input:checked + .slider {
  background-color: rgba(255, 255, 255, 0.3);
}

input:checked + .slider::before {
  transform: translateX(20px);
  background-color: #10B981; /* Success Green for Whitelabel active visual */
}

/* Layout Wrapper for Main Column and Sidebar */
.layout-wrapper {
  display: flex;
  margin-top: 70px; /* Offset for sticky header */
  position: relative;
}

/* Sticky Sidebar Navigation */
.sidebar-nav {
  width: 320px;
  position: fixed;
  top: 70px;
  bottom: 0;
  left: 0;
  background: var(--color-bg-card);
  border-right: 1px solid var(--color-border);
  padding: 2.5rem 2rem;
  overflow-y: auto;
  z-index: 100;
  transition: background-color 0.4s ease, border-color 0.4s ease;
}

.sidebar-title {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-text-muted);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.toc-list {
  list-style: none;
}

.toc-item {
  margin-bottom: 0.75rem;
}

.toc-link {
  display: block;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  color: var(--color-text-main);
  font-weight: 500;
  font-size: 0.95rem;
  border-left: 3px solid transparent;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.toc-link:hover {
  background: rgba(0, 0, 0, 0.02);
  border-left-color: var(--color-accent);
  color: var(--color-primary);
  text-decoration: none;
  padding-left: 1.25rem;
}

.toc-item.active .toc-link {
  background: rgba(var(--color-primary), 0.05); /* Managed dynamically */
  border-left-color: var(--color-accent);
  color: var(--color-accent-text);
  font-weight: 700;
}

/* Active Highlight classes controlled via JavaScript styling fallback */
.toc-link-active {
  background: rgba(12, 30, 54, 0.03) !important;
  border-left-color: var(--color-accent) !important;
  color: var(--color-accent-text) !important;
  font-weight: 700 !important;
}
body.theme-whitelabel .toc-link-active {
  background: rgba(6, 78, 59, 0.03) !important;
}

/* Main Content Area */
.main-content {
  margin-left: 320px; /* Leave space for sidebar */
  flex: 1;
  padding: 4rem 5%;
  max-width: 1200px;
}

/* ==========================================================================
   5. Cover/Masthead Hero Page
   ========================================================================== */
.cover-hero {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 70vh;
  padding: 4rem 0;
  border-bottom: 2px solid var(--color-primary);
  margin-bottom: 6rem;
  position: relative;
}

.cover-image-container {
  width: 100%;
  max-width: 850px;
  margin: 2rem 0 3rem 0;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(12, 30, 54, 0.08);
  border: 1px solid var(--color-border);
  transition: border-color 0.4s ease;
}
body.theme-whitelabel .cover-image-container {
  box-shadow: 0 20px 40px rgba(6, 78, 59, 0.08);
}

.cover-image {
  width: 100%;
  height: 420px;
  object-fit: cover;
  display: block;
}


.cover-badge {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 4px;
  margin-bottom: 1.5rem;
}

.cover-title {
  font-size: 4rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  color: var(--color-primary);
}

.cover-subtitle {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.75rem;
  color: var(--color-text-muted);
  max-width: 800px;
  margin-bottom: 3rem;
  line-height: 1.4;
}

.cover-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 3rem;
  border-top: 1px solid var(--color-border);
  padding-top: 2rem;
}

.meta-item {
  display: flex;
  flex-direction: column;
}

.meta-label {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 0.25rem;
}

.meta-value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-primary);
}

/* ==========================================================================
   6. Editorial Article Layout
   ========================================================================== */
.article-section {
  scroll-margin-top: 100px;
  margin-bottom: 8rem;
  max-width: 850px;
}

.article-header {
  margin-bottom: 2.5rem;
}

.article-tag {
  display: inline-block;
  background: var(--color-accent);
  color: #FFFFFF;
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.3rem 0.8rem;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 1rem;
}

.article-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.article-lead {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 2rem;
  font-style: italic;
  border-left: 4px solid var(--color-accent);
  padding-left: 1.5rem;
}

/* First letter drop-cap for high-end look */
.article-body > p:first-of-type::first-letter {
  font-family: var(--font-serif);
  font-size: 4.5rem;
  float: left;
  line-height: 0.8;
  padding-right: 0.75rem;
  padding-top: 0.25rem;
  color: var(--color-primary);
  font-weight: 700;
}

/* Dynamic CSS Resource Allocation breakdown chart for Module 1 */
.data-chart-container {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem;
  margin: 2.5rem 0;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.02);
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 1.5rem;
}

.chart-title {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.chart-total {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-accent);
}

.bar-wrapper {
  display: flex;
  height: 40px;
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 1.5rem;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
}

.bar-segment {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  font-weight: 700;
  font-size: 0.75rem;
  font-family: var(--font-display);
  transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.bar-gasoline { background-color: var(--color-primary); }
.bar-software { background-color: var(--color-accent); }
.bar-ev { background-color: #64748B; }

.chart-legend {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1.5rem;
}

.legend-item {
  display: flex;
  flex-direction: column;
}

.legend-color-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.color-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.legend-value {
  font-size: 1.15rem;
  font-weight: 700;
  padding-left: 1.25rem;
}

/* Callout & Pull Quotes */
.pullquote {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-style: italic;
  color: var(--color-accent);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 1.5rem 0;
  margin: 2.5rem 0;
  text-align: center;
}

/* Editorial Images */
.image-wrapper {
  margin: 3rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.article-image {
  width: 100%;
  max-height: 400px;
  object-fit: cover;
  border-radius: 12px;
  border: 1px solid var(--color-border);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.03);
  transition: border-color 0.4s ease, border-width 0.4s ease;
}

.image-caption {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  border-left: 2px solid var(--color-accent);
  padding-left: 0.75rem;
  font-style: italic;
}


/* ==========================================================================
   7. Vocabulary Interactive Tooltips
   ========================================================================== */
.vocab-word {
  cursor: help;
  border-bottom: 2px dotted var(--color-accent);
  padding-bottom: 1px;
  font-weight: 600;
  color: var(--color-accent-text);
  transition: background-color 0.2s ease, border-color 0.2s ease;
  position: relative;
}

.vocab-word:hover {
  background-color: rgba(212, 83, 39, 0.08); /* Transparent tint of accent */
  border-bottom-style: solid;
}

body.theme-whitelabel .vocab-word:hover {
  background-color: rgba(217, 119, 6, 0.08);
}

/* Custom Tooltip Styling */
.vocab-tooltip {
  position: absolute;
  width: 280px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.25rem;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 16px -8px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
  pointer-events: none;
}

.vocab-tooltip.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.tooltip-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.5rem;
  margin-bottom: 0.5rem;
}

.tooltip-term {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-primary);
}

.tooltip-level {
  font-size: 0.7rem;
  font-weight: 700;
  background: var(--color-accent);
  color: #FFFFFF;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
}

.tooltip-definition {
  font-size: 0.85rem;
  color: var(--color-text-main);
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.tooltip-example {
  font-size: 0.8rem;
  font-style: italic;
  color: var(--color-text-muted);
  line-height: 1.4;
  border-left: 2px solid var(--color-accent);
  padding-left: 0.5rem;
}

/* ==========================================================================
   8. 3D CSS Flip Cards ("Manager's Action Cards")
   ========================================================================== */
.card-section-title {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--color-text-muted);
  margin-top: 3.5rem;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card-section-title::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

.card-container {
  perspective: 1200px;
  width: 100%;
  height: 430px; /* Taller height for absolute breathing room and pristine presentation */
  margin-bottom: 2.5rem;
}

.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  text-align: left;
  transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
  box-shadow: 0 15px 35px rgba(12, 30, 54, 0.05);
  border-radius: 16px;
}

.card-inner.is-flipped {
  transform: rotateY(180deg);
}

.card-front, .card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  border-radius: 16px;
  padding: 2rem 2.25rem; /* Reduced top/bottom padding to gain 16px vertical space */
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border: 1px solid var(--color-border);
}

/* Ensure inner wrappers stretch correctly so content does not overflow or push buttons off the card */
.card-front > div, .card-back > div {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.card-front {
  background-color: var(--color-bg-card);
  color: var(--color-text-main);
}

.card-back {
  background-color: var(--color-primary);
  color: #FFFFFF;
  transform: rotateY(180deg);
  border-color: transparent;
}

/* Front Card Elements */
.card-tag {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-accent);
  letter-spacing: 2px;
  margin-bottom: 0.5rem;
}

.card-dilemma-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.75rem; /* Slightly reduced margin to gain space */
}

.card-description {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--color-text-main);
  overflow-y: auto;
  max-height: 170px;
  margin-bottom: 1rem; /* Reduced margin to gain space */
  
  /* Hide standard scrollbars to preserve premium, print-like layout aesthetics */
  -ms-overflow-style: none; /* IE and Edge */
  scrollbar-width: none; /* Firefox */
}

.card-description::-webkit-scrollbar {
  display: none; /* Chrome, Safari, Opera */
}

.card-btn {
  align-self: flex-start;
  background-color: var(--color-accent);
  color: #FFFFFF;
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 0.8rem 1.75rem;
  border: none;
  border-radius: 30px;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(212, 83, 39, 0.2);
  transition: all 0.3s ease;
}

.card-btn:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(212, 83, 39, 0.3);
}

body.theme-whitelabel .card-btn {
  box-shadow: 0 4px 10px rgba(217, 119, 6, 0.2);
}
body.theme-whitelabel .card-btn:hover {
  box-shadow: 0 6px 15px rgba(217, 119, 6, 0.3);
}

/* Back Card Elements */
.card-back-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 0.5rem; /* Reduced margin to gain space */
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  padding-bottom: 0.5rem;
}

.card-task-body {
  font-size: 0.9rem;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.9);
  overflow-y: auto;
  flex: 1;
  margin-bottom: 1rem; /* Reduced margin from 1.5rem to gain space */
  padding-right: 0.25rem;
  
  /* Hide standard scrollbars to preserve premium, print-like layout aesthetics */
  -ms-overflow-style: none; /* IE and Edge */
  scrollbar-width: none; /* Firefox */
}

.card-task-body::-webkit-scrollbar {
  display: none; /* Chrome, Safari, Opera */
}

.card-task-body strong {
  color: #FFFFFF;
}

.target-vocab-list {
  background: rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  margin-top: 0.75rem;
}

.target-vocab-title {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 0.35rem;
}

.target-vocab-words {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  color: #FFFFFF;
}

.card-btn-back {
  background-color: transparent;
  color: #FFFFFF;
  border: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow: none;
}

.card-btn-back:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: #FFFFFF;
  box-shadow: none;
}

/* ==========================================================================
   8b. Interactive Scale (Opportunity Cost Balancing Board)
   ========================================================================== */
.interactive-scale-container {
  margin: 3.5rem 0;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 2.5rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.02);
  transition: all 0.4s ease;
}

.scale-header-block {
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 1.5rem;
}

.scale-badge {
  display: inline-block;
  background: var(--color-primary);
  color: #FFFFFF;
  font-family: var(--font-display);
  font-size: 0.65rem;
  font-weight: 700;
  padding: 0.25rem 0.75rem;
  border-radius: 30px;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 0.75rem;
  transition: background-color 0.4s ease;
}

body.theme-whitelabel .scale-badge {
  background: var(--color-primary);
}

.scale-widget-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
  transition: color 0.4s ease;
}

.scale-instruction {
  font-size: 0.95rem !important;
  font-weight: 400 !important;
  color: var(--color-text-muted) !important;
  line-height: 1.5;
  margin-bottom: 0;
}

.scale-widget {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3rem;
  padding: 1.5rem 0;
}

.scale-beam-wrapper {
  position: relative;
  width: 100%;
  max-width: 600px;
  height: 240px;
  display: flex;
  justify-content: center;
  align-items: flex-end;
}

.scale-pillar {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 10px;
  height: 85px;
  background: var(--color-primary);
  border-radius: 4px 4px 0 0;
  z-index: 1;
  transition: background-color 0.4s ease;
}

.scale-pivot {
  position: absolute;
  bottom: 85px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 25px solid transparent;
  border-right: 25px solid transparent;
  border-bottom: 50px solid var(--color-primary);
  z-index: 2;
  transition: border-bottom-color 0.4s ease;
}

.scale-beam {
  position: absolute;
  bottom: 130px;
  left: 0;
  right: 0;
  height: 10px;
  background: var(--color-primary);
  border-radius: 5px;
  transform-origin: center bottom;
  transform: rotate(0deg);
  transition: transform 0.4s cubic-bezier(0.25, 0.8, 0.25, 1), background-color 0.4s ease;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  z-index: 1;
}

.scale-pan {
  position: absolute;
  top: 10px;
  width: 180px;
  background: var(--color-bg-paper);
  border: 2px solid var(--color-primary);
  border-radius: 12px;
  padding: 1rem;
  text-align: center;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
  transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1), border-color 0.4s ease, background-color 0.4s ease;
}

.scale-pan-left {
  left: 10px;
  transform-origin: center top;
}

.scale-pan-right {
  right: 10px;
  transform-origin: center top;
}

/* Adjust hanging strings visual using CSS pseudo elements */
.scale-pan::before {
  content: "";
  position: absolute;
  top: -30px;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: 30px;
  background: var(--color-primary);
  transition: background-color 0.4s ease;
}

.pan-label {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-primary);
  margin-bottom: 0.25rem;
  transition: color 0.4s ease;
}

.pan-value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-accent);
  margin-bottom: 0.15rem;
  transition: color 0.4s ease;
}

.pan-subtext {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.scale-controls {
  width: 100%;
  max-width: 500px;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  align-items: center;
}

.slider-wrapper {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.slider-hint {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
  width: 110px;
}

.slider-hint:last-child {
  text-align: right;
}

.scale-slider {
  -webkit-appearance: none;
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: var(--color-border);
  outline: none;
  cursor: grab;
  transition: background 0.4s ease;
}

.scale-slider:active {
  cursor: grabbing;
}

.scale-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-accent);
  cursor: grab;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
  transition: background-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
  animation: pulse-glow 2s infinite;
}

.scale-slider::-webkit-slider-thumb:active {
  cursor: grabbing;
}

.scale-slider:hover::-webkit-slider-thumb,
.scale-slider:active::-webkit-slider-thumb,
.scale-slider:focus-visible::-webkit-slider-thumb {
  animation: none;
  background: var(--color-accent-hover);
  transform: scale(1.15);
  box-shadow: 0 4px 12px rgba(212, 83, 39, 0.4);
}

body.theme-whitelabel .scale-slider::-webkit-slider-thumb {
  animation: pulse-glow-whitelabel 2s infinite;
}

body.theme-whitelabel .scale-slider:hover::-webkit-slider-thumb,
body.theme-whitelabel .scale-slider:active::-webkit-slider-thumb,
body.theme-whitelabel .scale-slider:focus-visible::-webkit-slider-thumb {
  box-shadow: 0 4px 12px rgba(217, 119, 6, 0.4);
}

.scale-slider::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-accent);
  cursor: grab;
  border: none;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
  transition: background-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
  animation: pulse-glow 2s infinite;
}

.scale-slider::-moz-range-thumb:active {
  cursor: grabbing;
}

.scale-slider:hover::-moz-range-thumb,
.scale-slider:active::-moz-range-thumb,
.scale-slider:focus-visible::-moz-range-thumb {
  animation: none;
  background: var(--color-accent-hover);
  transform: scale(1.15);
  box-shadow: 0 4px 12px rgba(212, 83, 39, 0.4);
}

body.theme-whitelabel .scale-slider::-moz-range-thumb {
  animation: pulse-glow-whitelabel 2s infinite;
}

body.theme-whitelabel .scale-slider:hover::-moz-range-thumb,
body.theme-whitelabel .scale-slider:active::-moz-range-thumb,
body.theme-whitelabel .scale-slider:focus-visible::-moz-range-thumb {
  box-shadow: 0 4px 12px rgba(217, 119, 6, 0.4);
}

@keyframes pulse-glow {
  0% {
    box-shadow: 0 0 0 0 rgba(212, 83, 39, 0.5), 0 2px 8px rgba(0, 0, 0, 0.25);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(212, 83, 39, 0), 0 2px 8px rgba(0, 0, 0, 0.25);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(212, 83, 39, 0), 0 2px 8px rgba(0, 0, 0, 0.25);
  }
}

@keyframes pulse-glow-whitelabel {
  0% {
    box-shadow: 0 0 0 0 rgba(217, 119, 6, 0.5), 0 2px 8px rgba(0, 0, 0, 0.25);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(217, 119, 6, 0), 0 2px 8px rgba(0, 0, 0, 0.25);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(217, 119, 6, 0), 0 2px 8px rgba(0, 0, 0, 0.25);
  }
}

.scale-feedback {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--color-text-main);
  text-align: center;
  min-height: 54px;
  padding: 0.75rem 1.25rem;
  background: var(--color-bg-paper);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  transition: all 0.4s ease;
}

/* Responsiveness for Scale */
@media (max-width: 600px) {
  .scale-beam-wrapper {
    height: 260px;
  }
  .scale-pan {
    width: 120px;
    padding: 0.5rem;
  }
  .pan-value {
    font-size: 1.1rem;
  }
  .pan-label {
    font-size: 0.7rem;
  }
  .slider-wrapper {
    flex-direction: column;
    gap: 0.5rem;
  }
  .slider-hint {
    width: 100%;
    text-align: center !important;
  }
}

/* ==========================================================================
   9. Reference Accordion (Expandable Footnotes)
   ========================================================================== */
.references-wrapper {
  margin-top: 8rem;
  border-top: 1px solid var(--color-border);
  padding-top: 4rem;
  max-width: 850px;
}

.ref-accordion-trigger {
  width: 100%;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.25rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  transition: all 0.3s ease;
}

.ref-accordion-trigger:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.02);
}

.ref-title-holder {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-primary);
}

.ref-chevron {
  width: 24px;
  height: 24px;
  transition: transform 0.3s ease;
  fill: var(--color-text-muted);
}

.ref-accordion-trigger.active .ref-chevron {
  transform: rotate(180deg);
}

.ref-content-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.ref-list {
  list-style: none;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-top: none;
  border-bottom-left-radius: 12px;
  border-bottom-right-radius: 12px;
  padding: 2rem;
}

.ref-item {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
  text-indent: -1.5rem;
  line-height: 1.5;
}

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

.ref-citation-marker {
  font-weight: 600;
  color: var(--color-accent-text);
  margin-right: 0.5rem;
}

/* Footnote Superscript markers in articles */
.footnote-ref {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent-text);
  vertical-align: super;
  padding: 4px 6px;
  margin: -4px -4px;
  cursor: pointer;
}

.footnote-ref:hover {
  text-decoration: underline;
}

/* ==========================================================================
   10. Footer Section
   ========================================================================== */
.main-footer {
  background: var(--color-footer-bg);
  color: rgba(255, 255, 255, 0.6);
  padding: 4rem 2rem;
  margin-top: auto;
  border-top: 4px solid var(--color-accent);
  font-size: 0.85rem;
  text-align: center;
  transition: background-color 0.4s ease, border-color 0.4s ease;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: 3px;
  text-transform: uppercase;
}

.footer-tagline {
  font-family: var(--font-serif);
  font-style: italic;
  max-width: 600px;
}

.footer-copyright {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1.5rem;
  width: 100%;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.4);
}

/* ==========================================================================
   11. Responsiveness (Media Queries)
   ========================================================================== */

/* Tablet Layout (Hide static sidebar navigation and make it hamburger/scrollable wrapper if needed) */
@media (max-width: 1024px) {
  .sidebar-nav {
    display: none; /* Hide for cleaner mobile reading flow */
  }
  
  .main-content {
    margin-left: 0;
    padding: 3rem 1.5rem;
  }
  
  h1 { font-size: 3rem; }
  .cover-title { font-size: 3rem; }
}

@media (max-width: 768px) {
  .main-header {
    padding: 0 1rem;
  }
  
  .header-controls {
    gap: 0.75rem;
  }
  
  .logo-text-holder {
    display: none; /* Strip text on small phone views for layout space */
  }
  
  .cover-hero {
    min-height: 50vh;
    padding: 2rem 0;
  }
  
  .cover-title {
    font-size: 2.25rem;
  }
  
  .cover-subtitle {
    font-size: 1.25rem;
  }
  
  .article-title {
    font-size: 2rem;
  }
  
  .card-container {
    height: 480px; /* Expand card height on mobile to support wrapping text */
  }
  
  .card-front, .card-back {
    padding: 1.5rem;
  }
  
  .card-description {
    max-height: 240px;
  }
  
  .ref-accordion-trigger {
    padding: 1rem 1.25rem;
  }
  
  .ref-list {
    padding: 1.5rem 1.25rem;
  }
}

/* ==========================================================================
   12. Print Stylesheet ( Crisp High-End PDF Generation )
   ========================================================================== */
@media print {
  /* Hide UI elements that aren't content */
  .main-header,
  .sidebar-nav,
  .theme-switch-wrapper,
  .card-btn,
  .ref-chevron,
  .main-footer {
    display: none !important;
  }
  
  /* Reset layout constraints */
  body {
    background-color: #FFFFFF !important;
    color: #000000 !important;
    font-size: 12pt;
    line-height: 1.5;
  }
  
  .layout-wrapper {
    margin-top: 0 !important;
  }
  
  .main-content {
    margin-left: 0 !important;
    padding: 0 !important;
    max-width: 100% !important;
  }
  
  .cover-hero {
    min-height: auto !important;
    page-break-after: always;
    border-bottom: 2px solid #000000 !important;
    padding: 2in 0 !important;
  }
  
  .cover-title {
    font-size: 36pt !important;
  }
  
  .article-section {
    page-break-after: always;
    max-width: 100% !important;
  }
  
  h2 {
    border-bottom: 1px solid #000000 !important;
  }
  
  /* Render interactive 3D cards as flat panels on print */
  .card-container {
    height: auto !important;
    page-break-inside: avoid;
    margin-top: 2rem;
  }
  
  .card-inner {
    box-shadow: none !important;
    transform: none !important;
  }
  
  .card-front {
    position: relative !important;
    border: 2px solid #000000 !important;
    height: auto !important;
    padding: 1.5rem !important;
    border-radius: 0 !important;
    margin-bottom: 1.5rem;
  }
  
  /* Print both front and back as separate flat pages or panels */
  .card-back {
    position: relative !important;
    transform: none !important;
    background-color: #FFFFFF !important;
    color: #000000 !important;
    border: 2px dashed #000000 !important;
    height: auto !important;
    padding: 1.5rem !important;
    border-radius: 0 !important;
    display: block !important;
    page-break-before: avoid;
    page-break-inside: avoid;
  }
  
  .card-back-title {
    color: #000000 !important;
    border-bottom: 1px solid #000000 !important;
  }
  
  .card-task-body {
    color: #000000 !important;
  }
  
  .target-vocab-list {
    background: #F1F5F9 !important;
    border: 1px solid #CBD5E1 !important;
  }
  
  .target-vocab-words {
    color: #000000 !important;
  }
  
  /* Expand reference accordion on print */
  .ref-content-panel {
    max-height: 100% !important;
    overflow: visible !important;
  }
  
  .ref-list {
    padding: 1.5rem 0 !important;
    border: none !important;
  }
  
  /* Ensure hyperlinks are visible on print */
  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 9pt;
    color: #555555;
  }

  /* Coach Mode Print Controls */
  #coach-console-bar,
  .coach-console-wrapper {
    display: none !important;
  }

  body.role-teacher .coach-feedback-card {
    display: block !important;
    background: #FFFFFF !important;
    border: 2px solid #000000 !important;
    padding: 1.5rem !important;
    border-radius: 0 !important;
    page-break-inside: avoid;
    margin-top: 2rem !important;
    margin-bottom: 2rem !important;
  }

  body.role-teacher .coach-card-header {
    border-bottom: 1px solid #000000 !important;
    padding-bottom: 0.75rem !important;
    margin-bottom: 1rem !important;
  }

  body.role-teacher .coach-card-grid {
    display: block !important;
  }

  body.role-teacher .coach-section {
    page-break-inside: avoid;
    margin-bottom: 1.5rem !important;
  }

  body.role-teacher .coach-section-subtitle {
    color: #000000 !important;
    border-left: 3px solid #000000 !important;
    background: transparent !important;
  }

  body.role-teacher .coach-blockquote {
    background: #F8FAFC !important;
    border-left: 4px solid #000000 !important;
    color: #000000 !important;
  }

  body.role-teacher .coach-term {
    color: #000000 !important;
  }

  body.role-teacher .coach-ipa {
    background: #F1F5F9 !important;
    color: #000000 !important;
    border: 1px solid #CBD5E1 !important;
  }

  body:not(.role-teacher) .coach-feedback-card {
    display: none !important;
  }
}

/* ==========================================================================
   13. Interactive Coach Mode & Coach Feedback Card Styles
   ========================================================================== */
:root {
  --color-coach-primary: #4F46E5;
  --color-coach-primary-text: #3730A3; /* High-contrast Indigo 800 for body text (7.7:1+ on lavender/cream) */
  --color-coach-dark: #312E81;
  --color-coach-bg: #F5F3FF;
  --color-coach-border: #C7D2FE;
  --color-coach-accent: #7C3AED;
  --color-coach-accent-text: #5B21B6; /* High-contrast Purple 800 for readable accent indicators */
  --color-coach-text: #1E1B4B;
  --color-coach-pill-bg: #EEF2F6;
  --color-coach-pill-text: #1E1B4B; /* High-contrast Indigo 900 for badge text */
}

/* Floating Coach Console */
.coach-console-wrapper {
  display: none;
  width: 100%;
  background: rgba(49, 46, 129, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 2px solid var(--color-coach-accent);
  color: #FFFFFF;
  position: sticky;
  top: 0;
  z-index: 2000;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  animation: slideDown 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.coach-console-wrapper.active {
  display: block;
}

.coach-console-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.75rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.coach-console-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.coach-console-badge {
  background: var(--color-coach-accent-text);
  color: #FFFFFF;
  font-family: var(--font-display);
  font-size: 0.65rem;
  font-weight: 700;
  padding: 0.25rem 0.75rem;
  border-radius: 4px;
  letter-spacing: 1px;
}

.coach-console-desc {
  font-size: 0.85rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.9);
}

.coach-console-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.coach-toggle-label {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.9);
}

/* Slider Overrides for Coach Toggle */
.slider-coach {
  background-color: rgba(255, 255, 255, 0.2);
}

.switch .slider-coach::before {
  background-color: #FFFFFF;
}

input:checked + .slider-coach {
  background-color: var(--color-coach-accent);
}

/* Slide Down Keyframes */
@keyframes slideDown {
  from {
    transform: translateY(-100%);
  }
  to {
    transform: translateY(0);
  }
}

/* Coach Mode Body State Indicators */
body.role-teacher .vocab-word {
  color: var(--color-coach-primary-text) !important;
  border-bottom: 2px dashed var(--color-coach-primary-text) !important;
}

body.role-teacher .vocab-word:hover {
  background-color: rgba(79, 70, 229, 0.12) !important;
  border-bottom-style: dashed !important;
}

body.role-teacher .vocab-word::after {
  content: " 💡";
  font-size: 0.7rem;
}

/* Coach Feedback Guide Card styling */
.coach-feedback-card {
  display: none;
  background: var(--color-coach-bg);
  border: 2px solid var(--color-coach-border);
  border-radius: 16px;
  padding: 2.5rem;
  margin-top: 2rem;
  margin-bottom: 3.5rem;
  box-shadow: 0 10px 25px rgba(79, 70, 229, 0.05);
  animation: fadeIn 0.5s ease-out;
}

body.role-teacher .coach-feedback-card {
  display: block;
}

.coach-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--color-coach-border);
  padding-bottom: 1.25rem;
  margin-bottom: 1.75rem;
}

.coach-icon-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-coach-dark);
}

.coach-card-icon {
  color: var(--color-coach-primary-text);
}

.coach-card-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0;
}

.coach-pill {
  font-family: var(--font-display);
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  background: var(--color-coach-pill-bg);
  color: var(--color-coach-pill-text);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  border: 1px solid var(--color-coach-border);
}

.coach-card-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
}

.coach-section {
  margin-bottom: 1.5rem;
}

.coach-section:last-child {
  margin-bottom: 0;
}

.coach-section-subtitle {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-coach-primary-text);
  letter-spacing: 1px;
  margin-top: 0;
  margin-bottom: 0.75rem;
  border-left: 3px solid var(--color-coach-accent-text);
  padding-left: 0.5rem;
}

.coach-p {
  font-size: 0.9rem !important;
  line-height: 1.6 !important;
  color: var(--color-coach-text) !important;
  margin: 0 !important;
}

.coach-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.coach-list li {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--color-coach-text);
  margin-bottom: 0.75rem;
  padding-left: 1.25rem;
  text-indent: -1.25rem;
}

.coach-list li:last-child {
  margin-bottom: 0;
}

.coach-term {
  color: var(--color-coach-dark);
}

.coach-ipa {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 500;
  background: rgba(79, 70, 229, 0.08);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  color: var(--color-coach-primary-text);
}

.coach-blockquote {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--color-coach-dark);
  background: #FFFFFF;
  border-left: 4px solid var(--color-coach-primary);
  padding: 1rem 1.25rem;
  margin: 0;
  border-radius: 0 8px 8px 0;
  box-shadow: 0 4px 10px rgba(79, 70, 229, 0.02);
}

.coach-ol, .coach-ol ol {
  padding-left: 1.25rem;
  margin: 0;
}

.coach-ol li {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--color-coach-text);
  margin-bottom: 0.75rem;
}

.coach-ol li:last-child {
  margin-bottom: 0;
}

/* Responsive Coach Grid */
@media (max-width: 768px) {
  .coach-card-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .coach-feedback-card {
    padding: 1.5rem;
  }
}

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

/* ==========================================================================
   14. Module Page CTAs (Expert Layer upgrade — module-grained pages)
   ========================================================================== */

/* Persistent sidebar CTA card */
.sidebar-cta {
  margin: 2rem 1.5rem 0;
  padding: 1.5rem;
  background: var(--color-primary);
  border-radius: 14px;
  color: #FFFFFF;
}

.sidebar-cta-eyebrow {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.sidebar-cta-copy {
  font-size: 0.9rem;
  line-height: 1.55;
  color: rgba(255, 255, 255, 0.88);
  margin-bottom: 1.1rem;
  max-width: none;
}

.sidebar-cta-btn {
  display: inline-block;
  width: 100%;
  text-align: center;
  background: var(--color-accent);
  color: #FFFFFF;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.3px;
  padding: 0.8rem 1rem;
  border-radius: 10px;
  transition: background 0.2s ease, transform 0.2s ease;
}

.sidebar-cta-btn:hover {
  background: var(--color-accent-hover);
  color: #FFFFFF;
  text-decoration: none;
  transform: translateY(-1px);
}

/* Inline upgrade block after the action card */
.expert-cta-block {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
  margin: 3rem 0 1rem;
  padding: 2.25rem 2.5rem;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-footer-bg) 100%);
  border-radius: 18px;
  color: #FFFFFF;
}

.expert-cta-text {
  flex: 1 1 320px;
}

.expert-cta-eyebrow {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.6rem;
}

.expert-cta-title {
  font-family: var(--font-serif);
  color: #FFFFFF;
  font-size: 1.5rem;
  line-height: 1.25;
  margin-bottom: 0.6rem;
}

.expert-cta-copy {
  font-size: 1rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 0;
  max-width: 60ch;
}

.expert-cta-btn {
  flex: 0 0 auto;
  display: inline-block;
  background: var(--color-accent);
  color: #FFFFFF;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.3px;
  padding: 1rem 1.75rem;
  border-radius: 12px;
  white-space: nowrap;
  transition: background 0.2s ease, transform 0.2s ease;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.18);
}

.expert-cta-btn:hover {
  background: var(--color-accent-hover);
  color: #FFFFFF;
  text-decoration: none;
  transform: translateY(-2px);
}

/* Mobile: stack the inline CTA, full-width button */
@media (max-width: 768px) {
  .expert-cta-block {
    padding: 1.75rem 1.5rem;
  }
  .expert-cta-btn {
    width: 100%;
    text-align: center;
  }
}

/* Inline abstract SVG hero (module-grained pages) */
.module-hero {
  margin-top: 0.5rem;
}

.module-hero-svg {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 16px;
}

/* ==========================================================================
   15. Expert Layer Page (dedicated gated facilitator route)
   ========================================================================== */
.expert-page-banner {
  background: var(--color-coach-bg);
  border-bottom: 2px solid var(--color-coach-border);
  padding: 1rem 5%;
  margin-top: 70px;
}

.expert-page-banner-inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  max-width: 1100px;
  margin: 0 auto;
}

.expert-page-pill {
  background: var(--color-coach-accent);
  color: #FFFFFF;
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
}

.expert-page-banner-text {
  font-size: 0.92rem;
  color: var(--color-coach-primary-text);
  font-weight: 500;
}

.expert-back-link {
  margin-left: auto;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-coach-accent-text);
}

.expert-page-main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 3rem 5% 4rem;
}

.expert-page-title {
  font-size: 2.25rem;
  margin-bottom: 0.5rem;
}

.expert-page-lead {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  margin-bottom: 2.5rem;
  max-width: 68ch;
}

/* ==========================================================================
   16. Editorial polish (module-grained pages): pull-quote, stat callout,
       hero reveal animation. All restraint-compatible — craft, not decoration.
   ========================================================================== */

/* Pull-quote: reuse .pullquote, but darken to the AA-safe accent for contrast */
.pullquote.pullquote--module {
  color: var(--color-accent-text); /* B45309 — AA on sand, vs amber's ~2.9:1 */
  font-size: 1.65rem;
  line-height: 1.4;
  max-width: 100%;
  margin: 3rem 0;
}

/* Stat callout: data as the graphic. Large numeral + label, no decoration. */
.stat-callout {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  margin: 2.5rem 0;
  padding: 1.25rem 0 1.25rem 1.75rem;
  border-left: 4px solid var(--color-accent);
}

.stat-callout-figure {
  font-family: var(--font-serif);
  font-size: 4rem;
  font-weight: 700;
  line-height: 0.95;
  color: var(--color-primary);
  letter-spacing: -1px;
  flex: 0 0 auto;
}

.stat-callout-label {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-accent-text);
  margin-bottom: 0.35rem;
}

.stat-callout-desc {
  font-size: 1rem;
  line-height: 1.55;
  color: var(--color-text-main);
  margin: 0;
  max-width: 48ch;
}

@media (max-width: 600px) {
  .stat-callout {
    gap: 1rem;
    padding-left: 1.25rem;
  }
  .stat-callout-figure {
    font-size: 3rem;
  }
}

/* Hero reveal: subtle draw-in + staggered fade. Runs by default;
   disabled only for users who ask for reduced motion (static final state). */
.hero-draw {
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  animation: heroDraw 1.4s cubic-bezier(0.65, 0, 0.35, 1) 0.3s both;
}
.hero-rise {
  opacity: 0;
  animation: heroFade 0.7s ease both;
}
.hero-rise-0 { animation-delay: 0.2s; }
.hero-rise-2 { animation-delay: 1.2s; }
.hero-rise-1 { animation-delay: 1.4s; }
.hero-rise-3 { animation-delay: 1.6s; }

@keyframes heroDraw {
  from { stroke-dashoffset: 1; }
  to   { stroke-dashoffset: 0; }
}

@keyframes heroFade {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .hero-draw { stroke-dasharray: none; stroke-dashoffset: 0; animation: none; }
  .hero-rise { opacity: 1; animation: none; }
}

/* ==========================================================================
   17. Roleplay package (expert layer). Reuses the indigo coach palette so it
       reads as one facilitator kit. Every module gets one of these.
   ========================================================================== */

.roleplay-section {
  background: var(--color-coach-bg);
  border: 2px solid var(--color-coach-border);
  border-radius: 16px;
  padding: 2.5rem;
  margin-top: 1rem;
  margin-bottom: 3.5rem;
  box-shadow: 0 10px 25px rgba(79, 70, 229, 0.05);
}

.rp-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--color-coach-border);
  padding-bottom: 1.25rem;
  margin-bottom: 1.25rem;
}

.rp-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0;
  color: var(--color-coach-dark);
}

.rp-intro {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--color-coach-text);
  margin: 0 0 2rem;
  max-width: 70ch;
}

.rp-block {
  margin-bottom: 2.5rem;
}
.rp-block:last-child { margin-bottom: 0; }

.rp-block-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-coach-dark);
  margin: 0 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-coach-border);
}

.rp-sub {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-coach-primary-text);
  margin: 1.75rem 0 0.75rem;
}

.rp-tag-mini {
  font-family: var(--font-display);
  font-size: 0.6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-coach-accent-text);
  background: rgba(91, 33, 182, 0.08);
  padding: 0.15rem 0.5rem;
  border-radius: 12px;
  vertical-align: middle;
  margin-left: 0.35rem;
}

.rp-p, .rp-note {
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--color-coach-text);
  margin: 0 0 0.85rem;
}

.rp-note {
  color: var(--color-coach-primary-text);
  font-style: italic;
}

/* Role cards: the handover-safe student slices */
.rp-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.rp-card {
  background: #FFFFFF;
  border: 1px solid var(--color-coach-border);
  border-top: 4px solid var(--color-coach-primary);
  border-radius: 10px;
  padding: 1.5rem;
}

.rp-card-a { border-top-color: var(--color-primary); }     /* emerald */
.rp-card-b { border-top-color: var(--color-accent); }      /* amber */

.rp-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.85rem;
}

.rp-card-tag {
  font-family: var(--font-display);
  font-size: 0.6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-coach-primary-text);
}

.rp-print-btn {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--color-coach-primary-text);
  background: transparent;
  border: 1px solid var(--color-coach-border);
  border-radius: 6px;
  padding: 0.25rem 0.6rem;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}
.rp-print-btn:hover {
  background: var(--color-coach-primary);
  color: #FFFFFF;
  border-color: var(--color-coach-primary);
}

.rp-card-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-coach-dark);
  margin: 0 0 0.5rem;
}

.rp-card-lead {
  font-size: 0.9rem;
  line-height: 1.55;
  font-weight: 600;
  color: var(--color-coach-text);
  margin: 0 0 0.85rem;
}

.rp-card-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.rp-card-list li {
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--color-coach-text);
  margin-bottom: 0.6rem;
  padding-left: 1rem;
  position: relative;
}
.rp-card-list li:last-child { margin-bottom: 0; }
.rp-card-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-coach-accent-text);
}
.rp-card-list strong, .rp-card-lead strong { color: var(--color-coach-dark); }

/* Phrase bank, grouped by function */
.rp-func { margin-bottom: 1.1rem; }
.rp-func-label {
  display: block;
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-coach-primary-text);
  border-left: 3px solid var(--color-coach-accent-text);
  padding-left: 0.5rem;
  margin-bottom: 0.5rem;
}
.rp-phrase-list {
  list-style: none;
  padding: 0 0 0 0.5rem;
  margin: 0;
}
.rp-phrase-list li {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--color-coach-dark);
  margin-bottom: 0.4rem;
}

/* Numbered drill lists */
.rp-ol { padding-left: 1.25rem; margin: 0 0 0.85rem; }
.rp-ol li {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--color-coach-text);
  margin-bottom: 0.5rem;
}

/* Gap-fill blanks */
.rp-blank {
  display: inline-block;
  min-width: 90px;
  border-bottom: 1.5px solid var(--color-coach-primary-text);
  margin: 0 2px;
}

/* Answer keys */
.rp-key {
  background: rgba(6, 78, 59, 0.05);
  border-left: 3px solid var(--color-primary);
  border-radius: 0 8px 8px 0;
  padding: 0.85rem 1rem;
  margin: 0.5rem 0 0.5rem;
}
.rp-key-label {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-primary);
  margin-bottom: 0.35rem;
}
.rp-key p {
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--color-coach-text);
  margin: 0;
}
.rp-key strong { color: var(--color-coach-dark); }

/* Substitution tables */
.rp-table-cap {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-coach-primary-text);
  margin: 0.85rem 0 0.4rem;
}
.rp-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 0.75rem;
  font-size: 0.88rem;
}
.rp-table th {
  text-align: left;
  font-family: var(--font-display);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-coach-primary-text);
  background: rgba(79, 70, 229, 0.06);
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-coach-border);
}
.rp-table td {
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--color-coach-border);
  color: var(--color-coach-text);
  line-height: 1.45;
  vertical-align: top;
}
.rp-table td:first-child {
  font-weight: 600;
  color: var(--color-coach-dark);
  width: 38%;
}

/* Transformation drill labels */
.rp-bad {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: #9F1239;
  background: rgba(159, 18, 57, 0.08);
  padding: 0.1rem 0.45rem;
  border-radius: 10px;
  margin-right: 0.4rem;
  vertical-align: middle;
}

/* Prompt-and-response drill */
.rp-prompt-list { list-style: none; padding: 0; margin: 0 0 0.85rem; }
.rp-prompt-list li {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--color-coach-dark);
  margin-bottom: 0.65rem;
  padding-left: 0.75rem;
  border-left: 2px solid var(--color-coach-border);
}
.rp-prompt-ceo {
  font-weight: 700;
  color: var(--color-accent-text);
  margin-right: 0.25rem;
}
.rp-prompt-cue, .rp-cue {
  display: inline-block;
  font-size: 0.75rem;
  font-style: italic;
  color: var(--color-coach-primary-text);
  background: rgba(79, 70, 229, 0.06);
  padding: 0.1rem 0.5rem;
  border-radius: 10px;
  margin-left: 0.35rem;
}

/* Model exchange dialogue */
.rp-dialogue {
  background: #FFFFFF;
  border: 1px solid var(--color-coach-border);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
}
.rp-turn {
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--color-coach-text);
  margin: 0 0 0.85rem;
  padding-left: 5.5rem;
  text-indent: -5.5rem;
}
.rp-turn:last-child { margin-bottom: 0; }
.rp-spk {
  display: inline-block;
  width: 4.75rem;
  font-family: var(--font-display);
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  text-indent: 0;
  text-align: center;
  padding: 0.15rem 0;
  border-radius: 10px;
  margin-right: 0.75rem;
  vertical-align: baseline;
}
.rp-spk-ceo { color: #FFFFFF; background: var(--color-accent-hover); } /* B45309: 5.0:1 with white, AA */
.rp-spk-hos { color: #FFFFFF; background: var(--color-primary); }       /* 064E3B: ~13:1 with white */

/* Tiering */
.rp-tiers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}
.rp-tier {
  border: 1px solid var(--color-coach-border);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
  background: #FFFFFF;
}
.rp-tier-light { border-top: 4px solid var(--color-primary); }  /* on-palette forest */
.rp-tier-heavy { border-top: 4px solid #9F1239; }               /* semantic crimson = harder */
.rp-tier-label {
  display: block;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-coach-dark);
  margin-bottom: 0.75rem;
}

/* Responsive: stack the two-column grids */
@media (max-width: 768px) {
  .roleplay-section { padding: 1.5rem; }
  .rp-cards, .rp-tiers { grid-template-columns: 1fr; }
  .rp-turn { padding-left: 0; text-indent: 0; }
  .rp-spk { display: inline-block; margin-bottom: 0.25rem; }
}

/* "Open student card" link: opens a single role's standalone page in a new tab,
   so a teacher can share that one tab on Zoom or print it. */
.rp-open-btn {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 700;
  color: #FFFFFF;                         /* on coach-primary #4F46E5 = 6.3:1, AA */
  background: var(--color-coach-primary);
  border: 1px solid var(--color-coach-primary);
  border-radius: 6px;
  padding: 0.35rem 0.7rem;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.rp-open-btn:hover {
  background: var(--color-coach-dark);
  border-color: var(--color-coach-dark);
}

/* Visible keyboard focus for both card actions (WCAG 2.4.7 / 2.4.11) */
.rp-open-btn:focus-visible,
.rp-print-btn:focus-visible {
  outline: 2px solid var(--color-coach-dark);
  outline-offset: 2px;
}

/* Screen-reader-only text (e.g. announcing a gap-fill blank) */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ==========================================================================
   18. Standalone student-card pages (expert/role-a.html, role-b.html).
       The shareable / printable single-role view a teacher opens in a new tab.
   ========================================================================== */

.rp-card-page { background: var(--color-bg-paper); }

.card-page-wrap {
  max-width: 640px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 3rem;
}

.card-page-brand {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--color-accent-text);   /* B45309 on sand = AA */
  margin: 0 0 1rem;
}

.rp-card-standalone {
  padding: 2rem;
  border-top-width: 5px;
}
.rp-card-standalone .rp-card-title { font-size: 1.35rem; }

.card-page-foot {
  font-size: 0.8rem;
  font-style: italic;
  color: var(--color-text-muted);   /* 78716C on sand = AA for the supporting note */
  margin: 1.25rem 0 0;
  text-align: center;
}

/* Printing a standalone card: drop the chrome, keep the brief. */
@media print {
  .rp-card-page { background: #FFFFFF; }
  .rp-card-page .rp-print-btn,
  .rp-card-page .card-page-brand,
  .rp-card-page .card-page-foot { display: none; }
  .card-page-wrap { padding: 0; max-width: 100%; }
  .rp-card-standalone { border: 1px solid #767676; box-shadow: none; }
}

/* Wider wrap for the student practice / model-exchange pages (tables need room) */
.card-page-wrap--wide { max-width: 820px; }

/* Block header row: a section title with an "Open for student" action beside it.
   The border moves from the title to this wrapper so it still spans full width. */
.rp-block-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  border-bottom: 2px solid var(--color-coach-border);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
}
.rp-block-title--bare {
  border-bottom: none;
  margin: 0;
  padding: 0;
}