/* CSS variables for consistent Doshi branding */
:root {
  --color-crimson: #C00808;
  --color-crimson-dark: #8E0404;
  --color-crimson-light: #FCE8E8;
  --color-crimson-glow: rgba(192, 8, 8, 0.25);
  
  --color-dark-bg: #111315;
  --color-dark-card: #1C1F22;
  --color-dark-sidebar: #17191C;
  --color-dark-border: #2B2F34;
  
  --color-light-bg: #F8F9FA;
  --color-light-card: #FFFFFF;
  --color-light-border: #E5E7EB;
  
  --color-text-dark: #1E293B;
  --color-text-muted: #64748B;
  --color-text-light: #F8FAFC;
  
  --color-gold: #D4AF37;
  --color-gold-light: #FCF8E3;
  --color-gold-dark: #8A6F27;
  
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.12);
  --shadow-red: 0 10px 25px rgba(192, 8, 8, 0.15);
  
  --font-heading: 'Plus Jakarta Sans', sans-serif;
  --font-body: 'Inter', sans-serif;
  
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--font-body);
  color: var(--color-text-dark);
  background-color: var(--color-light-bg);
  line-height: 1.6;
  overflow-x: hidden;
}

body.course-mode-active {
  height: 100vh;
  overflow: hidden;
}

/* Professional flat SVG icons styling */
.flat-icon {
  display: inline-block;
  vertical-align: middle;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
  transition: var(--transition);
}

.landing-tab-btn .flat-icon {
  margin-right: 8px;
}

.offline-card-icon .flat-icon {
  width: 24px;
  height: 24px;
  color: var(--color-gold);
}

.benefit-icon-wrapper .flat-icon {
  width: 28px;
  height: 28px;
  color: var(--color-crimson);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Utility layout components */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: 700;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  font-size: 0.95rem;
}

.btn-primary {
  background-color: var(--color-crimson);
  color: #FFFFFF;
  box-shadow: 0 4px 12px rgba(192, 8, 8, 0.3);
}

.btn-primary:hover {
  background-color: var(--color-crimson-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(192, 8, 8, 0.4);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--color-crimson);
  color: var(--color-crimson);
}

.btn-outline:hover {
  background-color: var(--color-crimson-light);
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: transparent;
  border-color: var(--color-light-border);
  color: var(--color-text-muted);
}

.btn-secondary:hover {
  background-color: rgba(0,0,0,0.03);
  color: var(--color-text-dark);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
}

.w-full {
  width: 100%;
}

.badge {
  display: inline-block;
  padding: 4px 8px;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 4px;
}

.badge-red {
  background-color: var(--color-crimson-light);
  color: var(--color-crimson);
}

.badge-dark {
  background-color: var(--color-dark-border);
  color: var(--color-text-light);
}

.badge-gold {
  background-color: var(--color-gold-light);
  color: var(--color-gold-dark);
  border: 1px solid rgba(138, 111, 39, 0.2);
}

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

/* Header & Navbar */
.navbar {
  background-color: #FFFFFF;
  border-bottom: 1px solid var(--color-light-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.navbar-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo-wrapper {
  display: flex;
  align-items: center;
  cursor: pointer;
}

.logo-img {
  height: 52px;
  width: auto;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.logo-wrapper:hover .logo-img {
  transform: scale(1.03);
}

.nav-links-wrapper {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text-dark);
}

.nav-link:hover, .nav-link.active {
  color: var(--color-crimson);
}

/* User Widget on Navbar */
.user-widget {
  display: flex;
  align-items: center;
  gap: 10px;
}

.user-avatar-circle {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background-color: var(--color-crimson);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  border: 2px solid #FFFFFF;
  box-shadow: var(--shadow-sm);
}

.user-display-name {
  font-weight: 600;
  font-size: 0.9rem;
}

/* VIEW transitions */
.view-section {
  display: none;
}

.view-active {
  animation: fadeIn 0.4s ease forwards;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   LANDING PAGE
   ========================================================================== */

/* Hero Banner */
.hero {
  position: relative;
  background: radial-gradient(circle at 80% 20%, #FFF5F5 0%, #FFFFFF 100%);
  padding: 80px 0;
  border-bottom: 1px solid var(--color-light-border);
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
}

.hero-badge-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: var(--color-crimson-light);
  color: var(--color-crimson);
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 0.85rem;
  padding: 8px 16px;
  border-radius: 50px;
  text-transform: uppercase;
  margin-bottom: 24px;
}

.hero-badge-top svg {
  animation: pulse-red 2s infinite;
}

@keyframes pulse-red {
  0% { transform: scale(1); }
  50% { transform: scale(1.15); opacity: 0.8; }
  100% { transform: scale(1); }
}

.hero-title {
  font-size: 2.8rem;
  line-height: 1.2;
  color: var(--color-text-dark);
  margin-bottom: 20px;
}

.hero-title span {
  color: var(--color-crimson);
  display: block;
  font-weight: 900;
  margin-top: 8px;
}

.hero-slogan {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text-dark);
  background-color: #1E293B;
  color: #FFFFFF;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  display: inline-block;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.hero-description {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  margin-bottom: 36px;
  max-width: 540px;
}

.hero-actions {
  display: flex;
  gap: 16px;
}

.hero-graphics-container {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

/* Machine Illustrations SVGs */
.machine-card-illustration {
  background: white;
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-light-border);
  display: flex;
  gap: 30px;
  position: relative;
  z-index: 2;
}

.machine-svg-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.machine-svg-box span {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-text-muted);
  margin-top: 10px;
}

/* Section Header Styles */
.section-header {
  text-align: center;
  max-width: 700px;
  margin: 80px auto 30px auto;
}

.section-header h2 {
  font-size: 2.2rem;
  color: var(--color-text-dark);
  position: relative;
  padding-bottom: 15px;
  margin-bottom: 15px;
}

.section-header h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background-color: var(--color-crimson);
  border-radius: 2px;
}

.section-header p {
  color: var(--color-text-muted);
  font-size: 1.05rem;
}

/* Landing Course Type Selector Tabs */
.landing-course-tabs {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 45px;
}

.landing-tab-btn {
  padding: 14px 28px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.05rem;
  border-radius: 50px;
  border: 2px solid var(--color-crimson);
  background-color: #FFFFFF;
  color: var(--color-crimson);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 8px;
}

.landing-tab-btn:hover {
  background-color: var(--color-crimson-light);
}

.landing-tab-btn.active {
  background-color: var(--color-crimson);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(192, 8, 8, 0.3);
}

.landing-tab-pane {
  display: none;
  animation: fadeIn 0.4s ease;
}

.landing-tab-pane.active {
  display: block;
}

/* 8 Modules Curriculum Grid */
.curriculum-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 80px;
}

.module-card {
  background: var(--color-light-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-light-border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  height: 100%;
}

.module-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-red);
  border-color: rgba(192, 8, 8, 0.2);
}

.module-card-number {
  position: absolute;
  top: 0;
  left: 0;
  background-color: #B31B1B;
  color: #FFFFFF;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.25rem;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom-right-radius: var(--radius-md);
  z-index: 10;
  box-shadow: 2px 2px 5px rgba(0,0,0,0.1);
}

.module-card-header {
  background-color: #900D0D;
  padding: 20px 15px 20px 48px;
  text-align: center;
  min-height: 85px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 2px solid var(--color-gold);
}

.module-card-header h3 {
  color: #FFFFFF;
  font-size: 0.92rem;
  line-height: 1.4;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.2px;
}

.module-card-body {
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.module-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.module-bullets li {
  font-size: 0.85rem;
  color: var(--color-text-dark);
  position: relative;
  padding-left: 20px;
  line-height: 1.4;
}

.module-bullets li::before {
  content: '✓';
  position: absolute;
  left: 0;
  top: 1px;
  color: #B31B1B;
  font-weight: 900;
}

/* Offline VIP Course Grid */
.offline-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
  margin-bottom: 80px;
}

.offline-card {
  background: var(--color-light-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-light-border);
  border-top: 4px solid var(--color-gold);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: var(--transition);
}

.offline-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 28px rgba(138, 111, 39, 0.15);
  border-color: rgba(138, 111, 39, 0.3);
}

.offline-card-header {
  padding: 24px 30px;
  background-color: #1E293B;
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-dark-border);
}

.offline-card-title-box {
  display: flex;
  align-items: center;
  gap: 15px;
}

.offline-card-icon {
  font-size: 2rem;
}

.offline-card-title-box h3 {
  font-size: 1.15rem;
  color: #FFFFFF;
  line-height: 1.3;
}

.offline-card-body {
  padding: 30px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.offline-card-description {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  margin-bottom: 24px;
  line-height: 1.6;
}

.offline-skills-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 30px;
  flex-grow: 1;
}

.offline-skills-list li {
  font-size: 0.88rem;
  color: var(--color-text-dark);
  position: relative;
  padding-left: 24px;
  line-height: 1.4;
}

.offline-skills-list li::before {
  content: '🛠️';
  position: absolute;
  left: 0;
  top: 1px;
  font-size: 0.85rem;
}

.offline-card-footer {
  border-top: 1px solid var(--color-light-border);
  padding: 20px 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--color-light-bg);
}

.offline-price-box {
  display: flex;
  flex-direction: column;
}

.offline-price-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.offline-price-val {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-crimson);
}

.offline-duration-badge {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

/* Modal Popup Dialog */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background-color: #FFFFFF;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-light-border);
  width: 100%;
  max-width: 500px;
  padding: 35px;
  position: relative;
  transform: translateY(20px);
  transition: transform 0.3s ease;
}

.modal-overlay.active .modal-card {
  transform: translateY(0);
}

.modal-close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: var(--transition);
}

.modal-close-btn:hover {
  color: var(--color-crimson);
}

.modal-header {
  margin-bottom: 24px;
}

.modal-header h3 {
  font-size: 1.4rem;
  color: var(--color-text-dark);
  margin-bottom: 6px;
}

.modal-header p {
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

/* Benefits Section */
.benefits-section {
  background-color: #1A1D20;
  padding: 80px 0;
  color: #FFFFFF;
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.benefit-card {
  background-color: #23272C;
  border-radius: var(--radius-md);
  padding: 30px 24px;
  text-align: center;
  border: 1px solid var(--color-dark-border);
  transition: var(--transition);
}

.benefit-card:hover {
  transform: translateY(-4px);
  background-color: #292E34;
  border-color: rgba(192, 8, 8, 0.4);
}

.benefit-icon-wrapper {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background-color: rgba(192, 8, 8, 0.15);
  border: 2px solid var(--color-crimson);
  color: var(--color-crimson);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px auto;
  font-size: 1.8rem;
}

.benefit-card h3 {
  font-size: 1.1rem;
  margin-bottom: 12px;
  color: #FFFFFF;
}

.benefit-card p {
  font-size: 0.88rem;
  color: #94A3B8;
  line-height: 1.5;
}

/* CTA Promo Box banner */
.promo-banner {
  background-color: var(--color-crimson);
  color: #FFFFFF;
  padding: 40px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.promo-banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 30% 50%, rgba(255,255,255,0.08) 0%, transparent 60%);
  pointer-events: none;
}

.promo-title {
  font-size: 1.6rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 16px;
}

.promo-actions {
  display: flex;
  justify-content: center;
  gap: 20px;
}

.btn-white {
  background-color: #FFFFFF;
  color: var(--color-crimson);
  box-shadow: var(--shadow-md);
}

.btn-white:hover {
  background-color: #F8FAFC;
  transform: translateY(-2px);
}

/* Footer style */
.footer {
  background-color: #0E1012;
  color: #94A3B8;
  padding: 60px 0 30px 0;
  border-top: 1px solid #1E293B;
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 0.8fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-about h3 {
  color: #FFFFFF;
  font-size: 1.4rem;
  margin-bottom: 16px;
}

.footer-about p {
  margin-bottom: 20px;
  line-height: 1.6;
}

.footer-links h4, .footer-contact h4 {
  color: #FFFFFF;
  font-size: 1rem;
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.footer-links ul {
  list-style: none;
}

.footer-links ul li {
  margin-bottom: 10px;
}

.footer-links ul li a:hover {
  color: var(--color-crimson);
}

.footer-contact-list {
  list-style: none;
}

.footer-contact-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 12px;
  line-height: 1.4;
}

.footer-contact-list svg {
  flex-shrink: 0;
  margin-top: 3px;
  color: var(--color-crimson);
}

.footer-bottom {
  border-top: 1px solid #1E293B;
  padding-top: 30px;
  text-align: center;
  font-size: 0.8rem;
}


/* ==========================================================================
   AUTHENTICATION PAGE
   ========================================================================== */
.auth-container {
  display: none;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 80px);
  padding: 40px 20px;
  background: radial-gradient(circle at 10% 80%, #FFF5F5 0%, #FFFFFF 80%);
}

.auth-container.view-active {
  display: flex;
}

.auth-card {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-light-border);
  width: 100%;
  max-width: 460px;
  padding: 40px;
  animation: fadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.auth-header {
  text-align: center;
  margin-bottom: 30px;
}

.auth-header svg {
  margin-bottom: 12px;
}

.auth-header h2 {
  font-size: 1.8rem;
  color: var(--color-text-dark);
  margin-bottom: 8px;
}

.auth-header p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-text-dark);
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-light-border);
  outline: none;
  transition: var(--transition);
}

.form-control:focus {
  border-color: var(--color-crimson);
  box-shadow: 0 0 0 3px var(--color-crimson-glow);
}

.form-error {
  color: var(--color-crimson);
  font-size: 0.8rem;
  font-weight: 600;
  margin-top: 8px;
  display: none;
}

.form-success {
  color: #10B981;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 16px;
  display: none;
}

.auth-switch {
  text-align: center;
  margin-top: 24px;
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

.auth-switch a {
  color: var(--color-crimson);
  font-weight: 700;
}

.auth-switch a:hover {
  text-decoration: underline;
}

/* Demo Credentials Box */
.demo-accounts-box {
  background-color: var(--color-light-bg);
  border: 1px solid var(--color-light-border);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-top: 24px;
}

.demo-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 10px;
  letter-spacing: 0.5px;
  text-align: center;
}

.demo-accounts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.demo-btn-quick {
  background: white;
  border: 1px solid var(--color-light-border);
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  font-family: var(--font-heading);
}

.demo-btn-quick:hover {
  border-color: var(--color-crimson);
  background-color: var(--color-crimson-light);
}

.demo-btn-quick span {
  font-size: 0.72rem;
  color: var(--color-text-muted);
}

.demo-btn-quick strong {
  font-size: 0.82rem;
  color: var(--color-text-dark);
}


/* ==========================================================================
   COURSE VIEWER (PROTECTED PANEL)
   ========================================================================== */
.course-layout {
  background-color: var(--color-dark-bg);
  color: var(--color-text-light);
  height: calc(100vh - 80px);
  overflow: hidden;
  display: none;
  grid-template-columns: 320px 1fr;
}

.course-layout.view-active {
  display: grid;
}

/* Sidebar playlist */
.course-sidebar {
  background-color: var(--color-dark-sidebar);
  border-right: 1px solid var(--color-dark-border);
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
}

/* Selector Tabs in Workspace Sidebar */
.course-sidebar-modes {
  display: flex;
  background-color: rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid var(--color-dark-border);
}

.sidebar-mode-btn {
  flex: 1;
  text-align: center;
  padding: 14px 4px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.78rem;
  color: #64748B;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.sidebar-mode-btn.active {
  color: #FFFFFF;
  border-bottom-color: var(--color-crimson);
  background-color: rgba(255, 255, 255, 0.02);
}

.sidebar-mode-btn:hover:not(.active) {
  color: #E2E8F0;
  background-color: rgba(255, 255, 255, 0.01);
}

.course-progress-panel {
  padding: 24px;
  border-bottom: 1px solid var(--color-dark-border);
}

.progress-header {
  font-size: 0.8rem;
  font-weight: 700;
  color: #94A3B8;
  margin-bottom: 8px;
}

.progress-bar-bg {
  width: 100%;
  height: 6px;
  background-color: var(--color-dark-border);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 8px;
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  background-color: var(--color-crimson);
  border-radius: 3px;
  transition: width 0.4s ease;
}

.progress-percentage-text {
  font-size: 0.78rem;
  font-weight: 600;
  color: #E2E8F0;
}

.playlist-container {
  overflow-y: auto;
  flex-grow: 1;
  padding: 10px 0;
}

.playlist-item {
  display: flex;
  padding: 16px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.03);
  cursor: pointer;
  transition: var(--transition);
  align-items: flex-start;
  gap: 12px;
}

.playlist-item:hover {
  background-color: rgba(255,255,255,0.02);
}

.playlist-item.active {
  background-color: rgba(192, 8, 8, 0.12);
  border-left: 4px solid var(--color-crimson);
  padding-left: 16px;
}

.playlist-checkbox-wrapper {
  margin-top: 3px;
}

.playlist-checkbox-wrapper input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--color-crimson);
  cursor: pointer;
}

.playlist-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex-grow: 1;
}

.playlist-index {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--color-crimson);
  text-transform: uppercase;
}

.playlist-item.active .playlist-index {
  color: #FF5A5A;
}

.playlist-title {
  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1.4;
  color: #E2E8F0;
}

.playlist-item.active .playlist-title {
  color: #FFFFFF;
}

.playlist-duration {
  font-size: 0.75rem;
  color: #64748B;
}

.sidebar-profile-box {
  padding: 16px 24px;
  border-top: 1px solid var(--color-dark-border);
  background-color: rgba(0,0,0,0.15);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar-profile-widget {
  display: flex;
  align-items: center;
  gap: 10px;
}

.profile-avatar-circle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--color-crimson);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
}

.profile-info {
  display: flex;
  flex-direction: column;
}

.profile-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: #F8FAFC;
}

.profile-role {
  font-size: 0.7rem;
  color: #94A3B8;
}

.btn-logout-icon {
  color: #94A3B8;
  cursor: pointer;
  padding: 5px;
  border-radius: 4px;
  transition: var(--transition);
}

.btn-logout-icon:hover {
  background-color: rgba(255,255,255,0.05);
  color: var(--color-crimson);
}

/* Learning Workspace Main Panel */
.course-main {
  padding: 30px;
  overflow-y: auto;
  height: calc(100vh - 80px);
}

/* Workspace subviews */
.workspace-subview {
  display: none;
}

.workspace-subview.active {
  display: block;
  animation: fadeIn 0.4s ease;
}

.course-player-wrapper {
  position: relative;
  background-color: #000;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-dark-border);
  margin-bottom: 24px;
}

.video-aspect-container {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
  height: 0;
}

.video-aspect-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.lesson-meta-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-dark-border);
}

.lesson-meta-title h2 {
  font-size: 1.5rem;
  margin-bottom: 4px;
  color: #FFFFFF;
}

.lesson-meta-title span {
  font-size: 0.85rem;
  color: #94A3B8;
}

.lesson-meta-check-wrapper {
  display: flex;
  align-items: center;
  gap: 10px;
  background-color: rgba(255,255,255,0.03);
  padding: 10px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-dark-border);
}

.lesson-meta-check-wrapper label {
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
}

.lesson-meta-check-wrapper input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--color-crimson);
  cursor: pointer;
}

/* Tabs Navigation for learning documents and QA */
.course-tabs {
  display: flex;
  border-bottom: 1px solid var(--color-dark-border);
  margin-bottom: 24px;
}

.tab-btn {
  background: none;
  border: none;
  color: #94A3B8;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 12px 24px;
  cursor: pointer;
  position: relative;
  transition: var(--transition);
}

.tab-btn:hover {
  color: #FFFFFF;
}

.tab-btn.active {
  color: #FFFFFF;
}

.tab-btn.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 3px;
  background-color: var(--color-crimson);
}

.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

/* Tab Pane content details */
.tab-pane-content {
  background-color: var(--color-dark-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-dark-border);
  padding: 30px;
}

/* Details bullet list */
.course-lesson-bullets {
  list-style: none;
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.course-lesson-bullets li {
  font-size: 0.92rem;
  color: #E2E8F0;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.bullet-check {
  color: var(--color-crimson);
  font-weight: 900;
}

/* Attachments Styling */
.attachments-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.attachment-item {
  display: flex;
  align-items: center;
  padding: 16px 20px;
  background-color: rgba(255,255,255,0.02);
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.attachment-item:hover {
  background-color: rgba(255,255,255,0.05);
  border-color: rgba(192,8,8,0.4);
}

.file-icon {
  color: var(--color-crimson);
  margin-right: 16px;
}

.attachment-info {
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  gap: 2px;
}

.attachment-name {
  font-weight: 600;
  font-size: 0.9rem;
  color: #E2E8F0;
}

.attachment-size {
  font-size: 0.75rem;
  color: #64748B;
}

.attachment-download-btn {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-crimson);
  background-color: rgba(192,8,8,0.1);
  padding: 6px 12px;
  border-radius: 4px;
  border: 1px solid rgba(192,8,8,0.2);
}

/* Discussion Board Q&A styles */
.discussion-board {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.comment-input-box {
  display: flex;
  gap: 16px;
  margin-bottom: 10px;
}

.comment-input-box .comment-avatar {
  background-color: var(--color-crimson);
  color: white;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
}

.comment-form-wrapper {
  flex-grow: 1;
}

.comment-textarea {
  width: 100%;
  height: 80px;
  background-color: rgba(0,0,0,0.2);
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius-md);
  padding: 12px;
  color: #FFFFFF;
  font-family: var(--font-body);
  font-size: 0.9rem;
  outline: none;
  resize: none;
  margin-bottom: 10px;
  transition: var(--transition);
}

.comment-textarea:focus {
  border-color: var(--color-crimson);
}

.comments-list-wrapper {
  max-height: 400px;
  overflow-y: auto;
  padding-right: 10px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  border-top: 1px solid var(--color-dark-border);
  padding-top: 20px;
}

.comment-item {
  display: flex;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  background-color: rgba(255,255,255,0.01);
  border: 1px solid rgba(255,255,255,0.02);
}

.comment-item.instructor-reply {
  background-color: rgba(192, 8, 8, 0.04);
  border-color: rgba(192, 8, 8, 0.15);
}

.comment-item .comment-avatar {
  background-color: #475569;
  color: white;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.8rem;
  flex-shrink: 0;
}

.comment-item.instructor-reply .comment-avatar {
  background-color: var(--color-crimson);
}

.comment-body {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex-grow: 1;
}

.comment-header {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.comment-author {
  font-weight: 600;
  font-size: 0.88rem;
  color: #FFFFFF;
}

.comment-date {
  font-size: 0.75rem;
  color: #64748B;
  margin-left: auto;
}

.comment-content {
  font-size: 0.88rem;
  color: #CBD5E1;
  line-height: 1.5;
}

/* Offline Course Details in Dashboard Workspace */
.offline-workspace-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.offline-academy-intro {
  background-color: var(--color-dark-card);
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius-lg);
  padding: 30px;
}

.offline-academy-intro h3 {
  font-size: 1.4rem;
  color: #FFFFFF;
  margin-bottom: 12px;
}

.offline-academy-intro p {
  color: #94A3B8;
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 20px;
}

.offline-academy-details-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.academy-location-card {
  background-color: rgba(255,255,255,0.02);
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.academy-location-card h4 {
  font-size: 1.05rem;
  color: var(--color-gold);
  margin-bottom: 10px;
}

.academy-location-card p {
  font-size: 0.88rem;
  color: #E2E8F0;
  margin-bottom: 8px;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.offline-registered-classes {
  background-color: var(--color-dark-card);
  border: 1px solid var(--color-dark-border);
  border-radius: var(--radius-lg);
  padding: 30px;
}

.offline-registered-classes h3 {
  font-size: 1.3rem;
  color: #FFFFFF;
  margin-bottom: 20px;
}

.registered-class-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background-color: rgba(255,255,255,0.01);
  border: 1px solid var(--color-dark-border);
  border-left: 4px solid var(--color-gold);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
}

.reg-class-info h4 {
  font-size: 0.95rem;
  color: #FFFFFF;
  margin-bottom: 4px;
}

.reg-class-info span {
  font-size: 0.8rem;
  color: #94A3B8;
}

.reg-class-status {
  padding: 6px 12px;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 4px;
  background-color: rgba(16, 185, 129, 0.15);
  color: #10B981;
}

/* Hero Real Photo & Pulsating Indicator Lights */
.hero-image-wrapper {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-light-border);
  background-color: #000;
  max-width: 480px;
  margin: 0 auto;
}

.hero-real-image {
  width: 100%;
  height: auto;
  display: block;
  opacity: 0.95;
  transition: var(--transition);
}

.hero-image-wrapper:hover .hero-real-image {
  opacity: 1;
  transform: scale(1.02);
}

.pulse-dot {
  position: absolute;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  box-shadow: 0 0 6px currentColor;
  animation: pulse-glow 1.2s infinite alternate;
}

.pulse-yellow {
  color: #EAB308;
  background-color: #EAB308;
  animation-delay: 0s;
}

.pulse-green {
  color: #22C55E;
  background-color: #22C55E;
  animation-delay: 0.4s;
}

.pulse-red {
  color: #EF4444;
  background-color: #EF4444;
  animation-delay: 0.8s;
}

@keyframes pulse-glow {
  0% {
    opacity: 0.25;
    transform: scale(0.85);
    box-shadow: 0 0 4px currentColor;
  }
  100% {
    opacity: 1;
    transform: scale(1.3);
    box-shadow: 0 0 14px 5px currentColor;
  }
}

/* ==========================================================================
   RESPONSIVENESS (MEDIA QUERIES)
   ========================================================================== */
@media (max-width: 1024px) {
  .curriculum-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .offline-grid {
    grid-template-columns: 1fr;
  }
  .benefits-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .course-layout.view-active {
    grid-template-columns: 280px 1fr;
  }
}

@media (max-width: 768px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    padding: 40px 0;
  }
  .hero-title {
    font-size: 2.2rem;
  }
  .hero-description {
    margin: 0 auto 30px auto;
  }
  .hero-actions {
    justify-content: center;
  }
  .hero-graphics-container {
    margin-top: 20px;
  }
  .machine-card-illustration {
    padding: 16px;
    gap: 16px;
  }
  .curriculum-grid {
    grid-template-columns: 1fr;
  }
  .benefits-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  body.course-mode-active {
    height: auto !important;
    overflow: visible !important;
  }
  .course-layout.view-active {
    grid-template-columns: 1fr;
    height: auto;
    overflow: visible;
    display: flex;
    flex-direction: column;
  }
  .course-main {
    order: 1;
    height: auto;
    overflow: visible;
    padding: 16px;
  }
  .course-sidebar {
    order: 2;
    height: auto;
    position: static;
    overflow: visible;
    border-right: none;
    border-top: 1px solid var(--color-dark-border);
  }
  .playlist-container {
    overflow-y: visible !important;
  }
  #sidebar-online-controls, #sidebar-offline-controls {
    overflow-y: visible !important;
  }
  .offline-academy-details-grid {
    grid-template-columns: 1fr;
  }
  
  /* Mobile menu burger button */
  .nav-mobile-toggle {
    display: block !important;
    background: none;
    border: none;
    color: var(--color-text-dark);
    cursor: pointer;
    padding: 8px;
    outline: none;
  }
  
  .nav-links-wrapper {
    display: none;
    position: absolute;
    top: 80px;
    left: 0;
    right: 0;
    background-color: #FFFFFF;
    border-bottom: 1px solid var(--color-light-border);
    flex-direction: column;
    padding: 20px;
    gap: 16px;
    box-shadow: var(--shadow-md);
    z-index: 99;
  }
  
  .nav-links-wrapper.mobile-active {
    display: flex;
  }
  
  .user-widget {
    flex-direction: column;
    align-items: center;
    width: 100%;
    gap: 10px;
  }
  
  .user-widget .btn {
    width: 100%;
    text-align: center;
  }
  
  #btn-nav-login {
    width: 100%;
    text-align: center;
  }
  
  /* Hero actions responsive wrapping */
  .hero-actions {
    flex-direction: column;
    gap: 12px;
    width: 100%;
    max-width: 320px;
    margin: 0 auto;
  }
  
  .hero-actions .btn {
    width: 100%;
    text-align: center;
  }
  
  /* Lesson meta bar details wrap */
  .lesson-meta-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }
  
  .lesson-meta-check-wrapper {
    width: 100%;
    justify-content: center;
  }
  
  .logo-slogan {
    display: none !important;
  }
}

/* Floating Contact Buttons */
.floating-contact-container {
  position: fixed;
  bottom: 30px;
  right: 30px;
  display: flex;
  flex-direction: column;
  gap: 15px;
  z-index: 9999;
}

.contact-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  color: #FFFFFF;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
  position: relative;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  cursor: pointer;
}

.contact-btn span {
  position: absolute;
  right: 65px;
  background-color: #1E293B;
  color: #FFFFFF;
  font-family: var(--font-heading);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: 4px;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-dark-border);
}

.contact-btn:hover span {
  opacity: 1;
  visibility: visible;
}

.contact-btn:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

.btn-zalo {
  background-color: #0068FF;
}

.btn-hotline {
  background-color: #C00808;
}

/* Pulse animation ring for the Hotline button */
.hotline-pulse-ring {
  position: absolute;
  top: -5px;
  left: -5px;
  right: -5px;
  bottom: -5px;
  border: 2px solid #C00808;
  border-radius: 50%;
  animation: hotline-pulse 1.8s infinite;
  pointer-events: none;
}

@keyframes hotline-pulse {
  0% {
    transform: scale(0.95);
    opacity: 1;
  }
  100% {
    transform: scale(1.35);
    opacity: 0;
  }
}

@media (max-width: 768px) {
  .floating-contact-container {
    bottom: 20px;
    right: 20px;
    gap: 12px;
  }
  .contact-btn {
    width: 48px;
    height: 48px;
  }
}