/* ==========================================
   CSS DESIGN SYSTEM - QUANTEX ACADEMY
   ========================================== */

:root {
  --bg-primary: #0b0c10;
  --bg-secondary: #12141c;
  --bg-tertiary: #1b1e2c;
  --bg-card: #151824;
  --bg-card-hover: #1c2032;
  
  --accent-cyan: #00f0ff;
  --accent-cyan-glow: rgba(0, 240, 255, 0.3);
  --accent-cyan-dim: #00b0c0;
  --accent-purple: #bf5af2;
  --accent-purple-glow: rgba(191, 90, 242, 0.3);
  --accent-pink: #ff375f;
  
  --text-white: #f5f6f8;
  --text-muted: #9ba4b4;
  --text-dark: #0f111a;
  
  --border-glow: rgba(0, 240, 255, 0.15);
  --border-muted: rgba(255, 255, 255, 0.08);
  --border-focus: #bf5af2;
  
  --font-main: 'Outfit', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  --shadow-neon: 0 0 20px rgba(0, 240, 255, 0.15);
  --shadow-neon-purple: 0 0 20px rgba(191, 90, 242, 0.15);
  
  --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  --transition-fast: all 0.15s ease-out;
}

/* ==========================================
   RESET & GLOBAL BASICS
   ========================================== */

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--text-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

a:hover {
  color: var(--text-white);
  text-shadow: 0 0 8px var(--accent-cyan-glow);
}

ul {
  list-style: none;
}

/* Scrollbars */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 5px;
  border: 2px solid var(--bg-primary);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent-cyan-dim);
}

/* ==========================================
   COMMON COMPONENT STYLES
   ========================================== */

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  color: var(--text-white);
  position: relative;
  letter-spacing: -0.02em;
}

.section-title::after {
  content: '';
  display: block;
  width: 40px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
  margin-top: 6px;
  border-radius: 2px;
}

.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.badge-primary {
  background-color: rgba(0, 240, 255, 0.12);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 240, 255, 0.3);
}

.badge-secondary {
  background-color: rgba(191, 90, 242, 0.12);
  color: var(--accent-purple);
  border: 1px solid rgba(191, 90, 242, 0.3);
}

.badge-tertiary {
  background-color: rgba(255, 55, 95, 0.12);
  color: var(--accent-pink);
  border: 1px solid rgba(255, 55, 95, 0.3);
}

.badge-curriculum {
  background-color: var(--bg-primary);
  color: var(--text-muted);
  border: 1px solid var(--border-muted);
  font-size: 0.7rem;
  font-family: var(--font-mono);
}

.content-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-muted);
  border-radius: 12px;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.2);
  transition: var(--transition-smooth);
}

.content-card:hover {
  border-color: rgba(191, 90, 242, 0.25);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.card-glow {
  background-color: var(--bg-card);
  border: 1px solid rgba(0, 240, 255, 0.2);
  border-radius: 12px;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-neon);
}

.text-btn {
  background: none;
  border: none;
  color: var(--accent-cyan);
  font-family: var(--font-main);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition-fast);
}

.text-btn:hover {
  color: var(--text-white);
  text-shadow: 0 0 8px var(--accent-cyan-glow);
}

/* ==========================================
   APP HEADER
   ========================================== */

.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 72px;
  background-color: rgba(11, 12, 16, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-muted);
}

.header-container {
  max-width: 1400px;
  height: 100%;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.header-logo-img {
  height: 52px;
  width: auto;
  display: block;
  filter: drop-shadow(0 0 8px rgba(0, 240, 255, 0.3));
  transition: var(--transition-smooth);
}

.header-logo-img:hover {
  filter: drop-shadow(0 0 12px rgba(0, 240, 255, 0.6)) brightness(1.15);
}

.nav-contact-btn {
  background-color: transparent;
  border: 1px solid var(--accent-cyan);
  color: var(--accent-cyan);
  font-family: var(--font-main);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 8px 18px;
  border-radius: 6px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition-smooth);
}

.nav-contact-btn:hover {
  background-color: var(--accent-cyan);
  color: var(--bg-primary);
  box-shadow: var(--shadow-neon);
}

.nav-contact-btn:active {
  transform: scale(0.97);
}

/* ==========================================
   HERO / BANNER SECTION
   ========================================== */

.hero-banner {
  background: linear-gradient(135deg, #0b0c10 0%, #171026 50%, #0d1e2b 100%);
  border-bottom: 1px solid var(--border-muted);
  padding: 3rem 0;
  position: relative;
  overflow: hidden;
}

.hero-banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 70% 30%, rgba(191, 90, 242, 0.08) 0%, transparent 60%);
  pointer-events: none;
}

.hero-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
}

.hero-main-content {
  width: calc(100% - 380px);
  padding-right: 3rem;
}

.breadcrumbs {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-cyan);
  margin-bottom: 1.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

.breadcrumbs a:hover {
  color: var(--accent-cyan);
}

.course-title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1rem;
  letter-spacing: -0.03em;
  background: linear-gradient(120deg, var(--text-white) 30%, var(--accent-cyan) 80%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.course-subtitle {
  font-size: 1.15rem;
  font-weight: 400;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  max-width: 800px;
}

.course-meta-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 1.5rem;
}

.course-rating {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-white);
  margin-bottom: 1.25rem;
}

.rating-num {
  color: var(--accent-cyan);
  font-weight: 800;
  font-size: 1.1rem;
}

.rating-stars {
  color: #ffb800;
  font-size: 1.2rem;
  letter-spacing: -2px;
}

.rating-count {
  color: var(--accent-purple);
  font-weight: 500;
}

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

.creator-info {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.creator-name {
  color: var(--text-white);
  font-weight: 600;
}

.hero-extra-meta {
  display: flex;
  gap: 20px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ==========================================
   PAGE CONTENT LAYOUT
   ========================================== */

.main-layout-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2.5rem 2rem;
  display: flex;
  gap: 3rem;
  position: relative;
}

.primary-content {
  flex: 1;
  min-width: 0; /* Prevents flex items from breaking layout */
}

/* ==========================================
   STATS PANEL (AT A GLANCE)
   ========================================== */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 0.5rem;
}

.stat-card {
  background-color: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-muted);
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
  transition: var(--transition-fast);
}

.stat-card:hover {
  background-color: rgba(0, 240, 255, 0.04);
  border-color: rgba(0, 240, 255, 0.25);
  transform: translateY(-2px);
}

.stat-val {
  display: block;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  margin-bottom: 4px;
}

.stat-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.05em;
}

/* ==========================================
   LEARNING OBJECTIVES (WHAT YOU'LL LEARN)
   ========================================== */

.objectives-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.obj-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.925rem;
  color: var(--text-white);
  line-height: 1.5;
}

.obj-icon {
  color: var(--accent-cyan);
  flex-shrink: 0;
  margin-top: 3px;
  filter: drop-shadow(0 0 3px var(--accent-cyan-glow));
}

/* ==========================================
   INCLUDED LIST
   ========================================== */

.included-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem 2rem;
}

.included-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.925rem;
  color: var(--text-white);
}

.inc-icon {
  color: var(--accent-purple);
  flex-shrink: 0;
  margin-top: 2px;
  filter: drop-shadow(0 0 3px var(--accent-purple-glow));
}

/* ==========================================
   5 REASONS TO STUDY
   ========================================== */

.reasons-grid {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.reason-card {
  display: flex;
  gap: 20px;
  background-color: rgba(255, 255, 255, 0.01);
  border: 1px solid var(--border-muted);
  border-radius: 8px;
  padding: 1.25rem;
  transition: var(--transition-smooth);
}

.reason-card:hover {
  background-color: rgba(191, 90, 242, 0.03);
  border-color: rgba(191, 90, 242, 0.25);
  transform: translateX(4px);
}

.reason-number {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--accent-purple);
  line-height: 1;
  text-shadow: 0 0 10px var(--accent-purple-glow);
}

.reason-body h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 4px;
}

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

/* ==========================================
   COURSE CONTENT (ACCORDIONS)
   ========================================== */

.curriculum-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.curriculum-header .section-title {
  margin-bottom: 0;
}

.curriculum-meta {
  display: flex;
  align-items: center;
  gap: 15px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.week-group {
  margin-bottom: 2rem;
}

.week-title-banner {
  background-color: var(--bg-tertiary);
  border-left: 3px solid var(--accent-cyan);
  padding: 10px 15px;
  border-radius: 0 6px 6px 0;
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  letter-spacing: -0.01em;
}

.accordion-item {
  background-color: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-muted);
  border-radius: 6px;
  margin-bottom: 8px;
  overflow: hidden;
  transition: var(--transition-fast);
}

.accordion-item:hover {
  border-color: rgba(255, 255, 255, 0.15);
}

.accordion-header {
  width: 100%;
  padding: 14px 18px;
  background: none;
  border: none;
  text-align: left;
  display: flex;
  align-items: center;
  cursor: pointer;
  font-family: var(--font-main);
  font-size: 0.925rem;
  color: var(--text-white);
  transition: var(--transition-fast);
}

.accordion-header:hover {
  background-color: rgba(255, 255, 255, 0.02);
}

.accordion-arrow {
  font-size: 0.7rem;
  margin-right: 12px;
  color: var(--accent-cyan);
  transition: transform 0.2s ease;
  width: 10px;
  display: inline-block;
}

.sect-num {
  font-weight: 700;
  color: var(--accent-cyan);
  margin-right: 8px;
}

.sect-title {
  font-weight: 500;
  flex: 1;
}

.sect-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-left: 12px;
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
  background-color: rgba(0, 0, 0, 0.15);
}

.accordion-item.active .accordion-content {
  max-height: 2000px; /* arbitrary high number */
  transition: max-height 0.3s cubic-bezier(1, 0, 1, 0);
  border-top: 1px solid var(--border-muted);
}

.accordion-item.active .accordion-header {
  background-color: rgba(255, 255, 255, 0.03);
}

.lecture-list {
  padding: 10px 18px;
}

.lecture-list li {
  display: flex;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  font-size: 0.875rem;
}

.lecture-list li:last-child {
  border-bottom: none;
}

.lecture-play {
  color: var(--text-muted);
  font-size: 0.65rem;
  margin-right: 12px;
  opacity: 0.7;
}

.lecture-title {
  flex: 1;
  color: rgba(255, 255, 255, 0.9);
}

.lecture-preview {
  color: var(--accent-cyan);
  font-size: 0.75rem;
  font-weight: 600;
  margin-right: 18px;
  cursor: pointer;
  border-bottom: 1px dashed var(--accent-cyan);
  padding-bottom: 1px;
}

.lecture-preview:hover {
  color: var(--text-white);
  border-bottom-color: var(--text-white);
}

.lecture-time {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Capstone Specifics */
.capstone-desc {
  padding: 18px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.capstone-desc p {
  margin-bottom: 12px;
  color: var(--text-white);
}

.capstone-tasks {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.capstone-tasks li {
  position: relative;
  padding-left: 18px;
  font-size: 0.85rem;
}

.capstone-tasks li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent-purple);
}

/* ==========================================
   WHY US SECTIONS
   ========================================== */

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

.why-card {
  background-color: rgba(255, 255, 255, 0.015);
  border: 1px solid var(--border-muted);
  border-radius: 8px;
  padding: 1.25rem;
  transition: var(--transition-smooth);
}

.why-card:hover {
  background-color: rgba(0, 240, 255, 0.02);
  border-color: rgba(0, 240, 255, 0.2);
  transform: translateY(-3px);
}

.why-icon {
  color: var(--accent-cyan);
  margin-bottom: 12px;
  filter: drop-shadow(0 0 4px var(--accent-cyan-glow));
}

.why-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.why-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ==========================================
   RIGHT STICKY SIDEBAR
   ========================================== */

.sidebar-aside {
  width: 340px;
  flex-shrink: 0;
  position: relative;
}

.sticky-card {
  position: sticky;
  top: 96px; /* Header height + buffer */
  background-color: var(--bg-card);
  border: 1px solid var(--border-muted);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
  transition: var(--transition-smooth);
  z-index: 10;
}

.sticky-card:hover {
  border-color: rgba(0, 240, 255, 0.25);
  box-shadow: var(--shadow-neon);
}

/* Sidebar Overlap Trick for Udemy Vibe */
@media (min-width: 1025px) {
  .sidebar-aside {
    margin-top: -240px;
  }
}

.preview-media-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  background-color: #000;
  cursor: pointer;
  overflow: hidden;
}

.course-preview-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.85;
  transition: var(--transition-smooth);
}

.preview-media-container:hover .course-preview-img {
  transform: scale(1.05);
  opacity: 0.65;
}

.play-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 12px;
}

.play-btn-circle {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background-color: var(--text-white);
  color: var(--text-dark);
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
  transition: var(--transition-smooth);
}

.play-arrow {
  font-size: 1.1rem;
  margin-left: 3px;
}

.play-text {
  font-size: 0.85rem;
  font-weight: 700;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.8);
}

.preview-media-container:hover .play-btn-circle {
  transform: scale(1.1);
  background-color: var(--accent-cyan);
  box-shadow: var(--shadow-neon);
}

.purchase-container {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-muted);
}

.price-header {
  margin-bottom: 1.25rem;
}

.price-label {
  display: block;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 4px;
}

.pricing-summary {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 4px;
}

.glowing-price {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--accent-cyan);
  text-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
}

.price-type {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-right: 6px;
}

.or-separator {
  font-size: 0.8rem;
  color: var(--accent-purple);
  margin-right: 6px;
  font-weight: 600;
}

.buy-now-btn {
  width: 100%;
  padding: 12px;
  background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-purple) 100%);
  border: none;
  border-radius: 6px;
  color: var(--bg-primary);
  font-family: var(--font-main);
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition-smooth);
  box-shadow: 0 4px 15px rgba(0, 240, 255, 0.2);
}

.buy-now-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 240, 255, 0.4), var(--shadow-neon-purple);
}

.buy-now-btn:active {
  transform: scale(0.98);
}

.guarantee-text {
  text-align: center;
  font-size: 0.725rem;
  color: var(--text-muted);
  margin-top: 10px;
}

.sidebar-highlights {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-muted);
}

.sidebar-highlights h4 {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.highlights-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.highlights-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.825rem;
  color: var(--text-white);
}

.highlights-list svg {
  color: var(--accent-cyan);
  flex-shrink: 0;
}

.sidebar-actions {
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: center;
}

/* ==========================================
   FOOTER
   ========================================== */

.app-footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-muted);
  padding: 4rem 0 2rem 0;
  margin-top: 4rem;
}

.footer-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 2rem;
}

.footer-brand {
  max-width: 450px;
}

.footer-logo {
  display: flex;
  align-items: center;
  margin-bottom: 10px;
}

.footer-logo-img {
  height: 56px;
  width: auto;
  display: block;
  filter: drop-shadow(0 0 6px rgba(0, 240, 255, 0.2));
}

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

.footer-contacts h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--accent-cyan);
  letter-spacing: -0.01em;
}

.footer-contacts p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.footer-contacts a {
  color: var(--text-white);
}

.footer-contacts a:hover {
  color: var(--accent-cyan);
}

.footer-divider {
  height: 1px;
  background-color: var(--border-muted);
  margin: 2.5rem 0 1.5rem 0;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.confidentiality-notice {
  font-family: var(--font-mono);
  color: var(--accent-pink);
  font-size: 0.75rem;
}

/* ==========================================
   MODAL WINDOWS & POPUPS
   ========================================== */

/* Overlay */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(11, 12, 16, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1000;
  transition: opacity 0.3s ease;
  opacity: 1;
}

.modal-backdrop.hidden {
  opacity: 0;
  pointer-events: none;
}

/* Base Modal Card */
.custom-modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(1);
  width: 90%;
  max-width: 600px;
  background-color: var(--bg-card);
  border: 1px solid rgba(0, 240, 255, 0.2);
  border-radius: 16px;
  box-shadow: 0 15px 50px rgba(0, 0, 0, 0.6), var(--shadow-neon);
  padding: 2.5rem;
  z-index: 1001;
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s ease;
  opacity: 1;
}

.custom-modal.hidden {
  transform: translate(-50%, -45%) scale(0.95);
  opacity: 0;
  pointer-events: none;
}

.modal-close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 2rem;
  line-height: 1;
  cursor: pointer;
  transition: var(--transition-fast);
}

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

.modal-title {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
  background: linear-gradient(125deg, var(--text-white) 40%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.modal-subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

/* Popup 1: Plan Selection */
.plans-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.plan-card {
  background-color: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-muted);
  border-radius: 12px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition-smooth);
}

.plan-card:hover {
  border-color: var(--accent-cyan);
  background-color: rgba(255, 255, 255, 0.03);
  transform: translateY(-4px);
}

.plan-card.popular {
  border-color: rgba(191, 90, 242, 0.4);
  box-shadow: 0 4px 20px rgba(191, 90, 242, 0.08);
}

.plan-card.popular:hover {
  border-color: var(--accent-purple);
  box-shadow: var(--shadow-neon-purple);
}

.plan-badge {
  position: absolute;
  top: -12px;
  left: 20px;
  font-size: 0.65rem;
  text-transform: uppercase;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 20px;
  background-color: var(--bg-tertiary);
  color: var(--text-muted);
  border: 1px solid var(--border-muted);
}

.plan-card.popular .popular-badge {
  background-color: var(--accent-purple);
  color: var(--text-white);
  border-color: var(--accent-purple);
  box-shadow: 0 0 10px rgba(191, 90, 242, 0.4);
}

.plan-name {
  font-size: 1.1rem;
  font-weight: 700;
  margin-top: 5px;
  margin-bottom: 10px;
}

.plan-price {
  margin-bottom: 1.25rem;
  display: flex;
  align-items: baseline;
}

.plan-price .currency {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-white);
}

.plan-price .value {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1;
}

.plan-card.popular .plan-price .value {
  color: var(--accent-purple);
  text-shadow: 0 0 10px rgba(191, 90, 242, 0.2);
}

.plan-card:not(.popular) .plan-price .value {
  color: var(--accent-cyan);
  text-shadow: 0 0 10px rgba(0, 240, 255, 0.2);
}

.plan-price .period {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-left: 4px;
}

.plan-features {
  margin-bottom: 2rem;
  flex: 1;
}

.plan-features li {
  font-size: 0.775rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  line-height: 1.4;
}

.plan-select-btn {
  width: 100%;
  padding: 10px;
  background-color: transparent;
  border: 1px solid var(--accent-cyan);
  color: var(--accent-cyan);
  border-radius: 6px;
  font-family: var(--font-main);
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition-fast);
}

.plan-select-btn:hover {
  background-color: var(--accent-cyan);
  color: var(--bg-primary);
  box-shadow: var(--shadow-neon);
}

.plan-select-btn.accent {
  border-color: var(--accent-purple);
  color: var(--accent-purple);
}

.plan-select-btn.accent:hover {
  background-color: var(--accent-purple);
  color: var(--text-white);
  box-shadow: var(--shadow-neon-purple);
}

/* Popup 2: Lead Capture Form */
.selected-plan-box {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-muted);
  border-radius: 8px;
  padding: 10px 15px;
  margin-bottom: 1.5rem;
  display: flex;
  justify-content: space-between;
  font-size: 0.875rem;
}

.selected-plan-box.hidden {
  display: none !important;
}

.plan-banner-label {
  color: var(--text-muted);
  font-weight: 500;
}

.plan-banner-value {
  color: var(--accent-cyan);
  font-weight: 700;
  text-shadow: 0 0 5px var(--accent-cyan-glow);
}

.lead-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.form-label .required {
  color: var(--accent-pink);
}

.form-input, .form-textarea {
  width: 100%;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-muted);
  border-radius: 6px;
  padding: 12px 16px;
  color: var(--text-white);
  font-family: var(--font-main);
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition-smooth);
}

.form-input:focus, .form-textarea:focus {
  border-color: var(--accent-cyan);
  background-color: rgba(255, 255, 255, 0.03);
  box-shadow: 0 0 10px rgba(0, 240, 255, 0.15);
}

.form-textarea {
  resize: vertical;
}

.submit-lead-btn {
  margin-top: 10px;
  padding: 12px;
  background-color: var(--accent-cyan);
  border: none;
  border-radius: 6px;
  color: var(--bg-primary);
  font-family: var(--font-main);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  transition: var(--transition-smooth);
}

.submit-lead-btn:hover {
  background-color: var(--text-white);
  box-shadow: var(--shadow-neon);
}

.submit-lead-btn:active {
  transform: scale(0.98);
}

/* Popup 3: Success Feedback */
.success-modal {
  text-align: center;
  max-width: 500px;
}

.success-icon-wrapper {
  margin-bottom: 1.5rem;
}

.success-checkmark {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  display: block;
  stroke-width: 2;
  stroke: var(--accent-cyan);
  stroke-miterlimit: 10;
  box-shadow: inset 0px 0px 0px var(--accent-cyan);
  animation: fillSuccess .4s ease-in-out .4s forwards, scaleCheckmark .3s ease-in-out .9s both;
  margin: 0 auto;
}

.success-checkmark-circle {
  stroke-dasharray: 166;
  stroke-dashoffset: 166;
  stroke-width: 2;
  stroke-miterlimit: 10;
  stroke: var(--accent-cyan);
  fill: none;
  animation: strokeCircle .6s cubic-bezier(0.65, 0, 0.45, 1) forwards;
}

.success-checkmark-check {
  transform-origin: 50% 50%;
  stroke-dasharray: 48;
  stroke-dashoffset: 48;
  animation: strokeCheck .3s cubic-bezier(0.65, 0, 0.45, 1) .8s forwards;
}

@keyframes strokeCircle {
  100% { stroke-dashoffset: 0; }
}

@keyframes strokeCheck {
  100% { stroke-dashoffset: 0; }
}

@keyframes scaleCheckmark {
  0%, 100% { transform: none; }
  50% { transform: scale3d(1.1, 1.1, 1); }
}

@keyframes fillSuccess {
  100% { box-shadow: inset 0px 0px 0px 40px rgba(0, 240, 255, 0.1); }
}

.success-body {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-muted);
  border-radius: 8px;
  padding: 1.25rem;
  margin: 1.5rem 0;
  font-size: 0.875rem;
  color: var(--text-muted);
  text-align: left;
  line-height: 1.5;
}

.success-body p {
  margin-bottom: 8px;
}

.success-body p:last-child {
  margin-bottom: 0;
}

.close-success-btn {
  width: 100%;
  padding: 10px;
  background-color: transparent;
  border: 1px solid var(--border-muted);
  color: var(--text-white);
  border-radius: 6px;
  font-family: var(--font-main);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition-fast);
}

.close-success-btn:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* ==========================================
   RESPONSIVE DESIGN (MEDIA QUERIES)
   ========================================== */

@media (max-width: 1024px) {
  .hero-main-content {
    width: 100%;
    padding-right: 0;
  }
  
  .main-layout-container {
    flex-direction: column;
    gap: 2rem;
  }
  
  .sidebar-aside {
    width: 100%;
  }
  
  .sticky-card {
    position: static;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  }
}

@media (max-width: 768px) {
  .header-container {
    padding: 0 1rem;
  }
  
  .hero-banner {
    padding: 2rem 0;
  }
  
  .course-title {
    font-size: 1.85rem;
  }
  
  .course-subtitle {
    font-size: 1rem;
  }
  
  .main-layout-container {
    padding: 1.5rem 1rem;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .objectives-grid {
    grid-template-columns: 1fr;
  }
  
  .included-list {
    grid-template-columns: 1fr;
  }
  
  .why-grid {
    grid-template-columns: 1fr;
  }
  
  .capstone-tasks {
    grid-template-columns: 1fr;
  }
  
  .plans-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .custom-modal {
    padding: 1.5rem;
    width: 95%;
  }
}

/* ==========================================
   SHARE MODAL STYLES
   ========================================== */

.share-modal {
  max-width: 500px;
}

.share-link-container {
  display: flex;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-muted);
  border-radius: 8px;
  padding: 6px 6px 6px 16px;
  align-items: center;
  gap: 10px;
  margin-bottom: 2rem;
  transition: var(--transition-smooth);
}

.share-link-container:focus-within {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 10px rgba(0, 240, 255, 0.15);
}

.share-link-input {
  background: none;
  border: none;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  flex: 1;
  outline: none;
}

.copy-link-btn {
  background-color: var(--accent-cyan);
  border: none;
  color: var(--bg-primary);
  font-family: var(--font-main);
  font-weight: 700;
  font-size: 0.85rem;
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition-fast);
  white-space: nowrap;
}

.copy-link-btn:hover {
  background-color: var(--text-white);
  box-shadow: var(--shadow-neon);
}

.copy-link-btn:active {
  transform: scale(0.97);
}

.share-social-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.social-share-btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  padding: 12px 8px;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-white);
  transition: var(--transition-smooth);
}

.social-share-btn svg {
  flex-shrink: 0;
}

.social-share-btn.whatsapp {
  background-color: #25D366;
  color: #fff;
  box-shadow: 0 4px 12px rgba(37, 211, 102, 0.25);
}

.social-share-btn.whatsapp:hover {
  background-color: #20ba5a;
  box-shadow: 0 6px 16px rgba(37, 211, 102, 0.45);
  transform: translateY(-2px);
}

.social-share-btn.twitter {
  background-color: #000000;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
}

.social-share-btn.twitter:hover {
  background-color: #111;
  border-color: rgba(255, 255, 255, 0.3);
  box-shadow: 0 6px 16px rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

.social-share-btn.linkedin {
  background-color: #0077B5;
  color: #fff;
  box-shadow: 0 4px 12px rgba(0, 119, 181, 0.25);
}

.social-share-btn.linkedin:hover {
  background-color: #00669c;
  box-shadow: 0 6px 16px rgba(0, 119, 181, 0.45);
  transform: translateY(-2px);
}

@media (max-width: 480px) {
  .share-social-grid {
    grid-template-columns: 1fr;
  }
}