/* ==========================================================================
   MASTER CODING SAAS DESIGN SYSTEM (master-saas.css)
   Theme: Crisp Clean White SaaS Background with Vibrant Light Green (#16a34a / #22c55e) Accents
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700&family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');
@import url('https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.1/css/all.min.css');

:root {
  /* Crisp White Background & Light Green Palette */
  --bg-white: #ffffff;
  --bg-subtle: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --bg-glass: rgba(255, 255, 255, 0.92);
  --bg-dark-preview: #0f172a;
  
  --accent-primary: #16a34a;        /* Vibrant Light Green */
  --accent-primary-hover: #15803d;  /* Deep Light Green */
  --accent-emerald: #22c55e;        /* Light Emerald */
  --accent-mint: #34d399;           /* Mint Green */
  --accent-light-bg: #f0fdf4;       /* Soft Light Green Tint */
  --accent-light-border: rgba(34, 197, 94, 0.3);
  
  --gradient-primary: linear-gradient(135deg, #16a34a 0%, #22c55e 50%, #4ade80 100%);
  --gradient-secondary: linear-gradient(135deg, #22c55e 0%, #059669 100%);
  --gradient-card: linear-gradient(135deg, #ffffff 0%, #f0fdf4 100%);
  
  --text-main: #0f172a;             /* Dark Slate Text for crisp contrast */
  --text-secondary: #475569;        /* Medium Slate Text */
  --text-muted: #64748b;            /* Muted Text */
  --text-light-green: #15803d;      /* Light Green Text */
  
  --border-subtle: #e2e8f0;
  --border-strong: #cbd5e1;
  --border-glow: rgba(34, 197, 94, 0.45);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  --shadow-glow: 0 4px 20px rgba(34, 197, 94, 0.25);
  --shadow-card: 0 10px 30px -5px rgba(15, 23, 42, 0.08);
  
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', Consolas, Monaco, monospace;
}

/* Base Resets */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-subtle);
  color: var(--text-main);
  line-height: 1.6;
  margin: 0;
  padding: 0;
  padding-top: 72px;
  min-height: 100vh;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 50% -10%, rgba(34, 197, 94, 0.12) 0%, transparent 50%),
    radial-gradient(circle at 90% 40%, rgba(52, 211, 153, 0.08) 0%, transparent 40%);
  background-attachment: fixed;
}

/* Typography Overrides */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-main);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.text-muted-custom {
  color: var(--text-secondary) !important;
}

.text-light-green {
  color: var(--accent-primary) !important;
}

/* Custom Light Green Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-subtle);
}
::-webkit-scrollbar-thumb {
  background: rgba(34, 197, 94, 0.35);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent-primary);
}

/* ==========================================================================
   SAAS NAVBAR (Crisp White Glass)
   ========================================================================== */
.saas-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1050;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 12px 0;
  transition: all 0.3s ease;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
}

.saas-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.saas-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-main);
}

.saas-brand:hover {
  color: var(--text-main);
  text-decoration: none;
}

.saas-logo-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-size: 1.1rem;
  box-shadow: 0 4px 15px rgba(34, 197, 94, 0.35);
}

.saas-badge-pro {
  font-size: 0.65rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 20px;
  background: var(--accent-light-bg);
  color: var(--accent-primary);
  border: 1px solid var(--accent-light-border);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.saas-nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.saas-nav-item {
  position: relative;
}

.saas-nav-link {
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.925rem;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 6px;
}

.saas-nav-link:hover, .saas-nav-link.active {
  color: var(--accent-primary);
  background: var(--accent-light-bg);
  text-decoration: none;
}

/* Multi-level Dropdown */
.saas-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 240px;
  background: #ffffff;
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 8px;
  box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.12);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 1100;
}

.saas-nav-item:hover > .saas-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(4px);
}

.saas-dropdown-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.saas-dropdown-item:hover {
  color: var(--accent-primary);
  background: var(--accent-light-bg);
  text-decoration: none;
  padding-left: 16px;
}

.saas-dropdown-item i {
  width: 20px;
  color: var(--accent-primary);
}

/* Crisp Light Green Buttons */
.btn-saas-primary {
  background: var(--gradient-primary);
  color: #ffffff !important;
  font-weight: 700;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  border: none;
  box-shadow: var(--shadow-glow);
  transition: all 0.25s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none !important;
  cursor: pointer;
}

.btn-saas-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(34, 197, 94, 0.45);
  color: #ffffff !important;
}

.btn-saas-secondary {
  background: #ffffff;
  color: var(--text-main) !important;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  transition: all 0.25s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none !important;
  cursor: pointer;
  box-shadow: 0 2px 5px rgba(0,0,0,0.03);
}

.btn-saas-secondary:hover {
  background: var(--accent-light-bg);
  border-color: var(--accent-primary);
  color: var(--accent-primary) !important;
  transform: translateY(-2px);
}

.btn-saas-outline {
  border: 1px solid var(--accent-primary);
  color: var(--accent-primary) !important;
  background: #ffffff;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-saas-outline:hover {
  background: var(--accent-primary);
  color: #ffffff !important;
}

.saas-nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ==========================================================================
   HERO & FEATURE SECTIONS
   ========================================================================== */
.saas-hero {
  padding: 80px 0 50px;
  text-align: center;
  position: relative;
}

.saas-hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 30px;
  background: var(--accent-light-bg);
  border: 1px solid var(--accent-light-border);
  color: var(--accent-primary);
  font-size: 0.875rem;
  font-weight: 700;
  margin-bottom: 24px;
}

.saas-hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.03em;
  color: #0f172a;
}

.saas-hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 36px;
  font-weight: 400;
}

.saas-hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 50px;
}

/* Stats Grid */
.saas-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-top: 40px;
}

.saas-stat-card {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  box-shadow: var(--shadow-card);
  transition: all 0.3s ease;
}

.saas-stat-card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-3px);
  box-shadow: 0 10px 25px -5px rgba(34, 197, 94, 0.2);
}

.saas-stat-number {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--accent-primary);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.saas-stat-label {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 600;
  margin-top: 4px;
}

/* ==========================================================================
   WHITE CARDS & GRIDS
   ========================================================================== */
.saas-card {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-card);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.saas-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.saas-card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-4px);
  box-shadow: 0 20px 35px -10px rgba(15, 23, 42, 0.12);
}

.saas-card:hover::before {
  opacity: 1;
}

.saas-card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--accent-light-bg);
  border: 1px solid var(--accent-light-border);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  margin-bottom: 20px;
}

.saas-card-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: #0f172a;
}

.saas-card-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 20px;
}

/* Language Brand Pills */
.lang-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.lang-badge.java, .lang-badge.python, .lang-badge.cpp, 
.lang-badge.html, .lang-badge.css, .lang-badge.mysql, .lang-badge.php {
  background: var(--accent-light-bg);
  color: var(--accent-primary);
  border: 1px solid var(--accent-light-border);
}

/* ==========================================================================
   LMS MODULE & DOCUMENTATION READER LAYOUT
   ========================================================================== */
.lms-container {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 30px;
  padding: 30px 0;
}

.lms-sidebar {
  position: sticky;
  top: 92px;
  height: calc(100vh - 120px);
  overflow-y: auto;
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-card);
}

.lms-sidebar-title {
  font-size: 0.85rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-subtle);
}

.lms-menu-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  transition: all 0.2s ease;
  margin-bottom: 4px;
}

.lms-menu-item:hover, .lms-menu-item.active {
  background: var(--accent-light-bg);
  color: var(--accent-primary);
  text-decoration: none;
}

.lms-menu-item i {
  font-size: 0.85rem;
  color: var(--accent-primary);
}

.lms-content-card {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-card);
}

/* Code Snippet Container (Dark contrast for code readability) */
.code-block-wrapper {
  background: #0f172a;
  border: 1px solid #1e293b;
  border-radius: var(--radius-md);
  margin: 20px 0;
  overflow: hidden;
}

.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #1e293b;
  padding: 10px 16px;
  border-bottom: 1px solid #334155;
}

.code-block-lang {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: #4ade80;
  font-weight: 700;
}

.btn-copy-code {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #e2e8f0;
  font-size: 0.78rem;
  padding: 4px 10px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-copy-code:hover {
  background: var(--accent-primary);
  color: #ffffff;
}

.code-block-wrapper pre {
  margin: 0;
  padding: 18px 20px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: #f8fafc;
  overflow-x: auto;
  line-height: 1.6;
}

/* ==========================================================================
   QUIZZES & Q&A COMPONENTS
   ========================================================================== */
.quiz-header-card {
  background: var(--accent-light-bg);
  border: 1px solid var(--accent-light-border);
  border-radius: var(--radius-lg);
  padding: 24px 30px;
  margin-bottom: 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.quiz-timer-badge {
  background: #ffffff;
  border: 1px solid var(--accent-light-border);
  color: var(--accent-primary);
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  padding: 8px 18px;
  border-radius: 30px;
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: 0 2px 10px rgba(34, 197, 94, 0.15);
}

.quiz-option-card {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 14px;
}

.quiz-option-card:hover {
  background: var(--accent-light-bg);
  border-color: var(--accent-primary);
  transform: translateX(4px);
}

.quiz-option-card.selected {
  background: var(--accent-light-bg);
  border-color: var(--accent-primary);
}

.quiz-option-card.correct {
  background: #dcfce7 !important;
  border-color: var(--accent-primary) !important;
  color: #15803d !important;
}

/* ==========================================================================
   AUTH FORMS & INPUTS
   ========================================================================== */
.saas-auth-card {
  max-width: 440px;
  margin: 40px auto;
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 40px;
  box-shadow: 0 20px 40px -10px rgba(15, 23, 42, 0.12);
}

.form-control-saas {
  background: #f8fafc;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  color: var(--text-main) !important;
  padding: 12px 16px;
  font-size: 0.95rem;
  transition: all 0.2s ease;
  width: 100%;
}

.form-control-saas:focus {
  outline: none;
  background: #ffffff;
  border-color: var(--accent-primary);
  box-shadow: 0 0 15px rgba(34, 197, 94, 0.25);
}

.form-label-saas {
  color: var(--text-main);
  font-weight: 600;
  font-size: 0.875rem;
  margin-bottom: 8px;
  display: block;
}

/* FAQ Accordion Styling */
.saas-accordion .accordion-item {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md) !important;
  margin-bottom: 14px;
  overflow: hidden;
}

.saas-accordion .accordion-button {
  background: #ffffff;
  color: var(--text-main);
  font-weight: 700;
  font-size: 1.05rem;
  padding: 18px 24px;
  border: none;
  box-shadow: none;
}

.saas-accordion .accordion-button:not(.collapsed) {
  background: var(--accent-light-bg);
  color: var(--accent-primary);
}

.saas-accordion .accordion-body {
  color: var(--text-secondary);
  padding: 20px 24px;
  font-size: 0.95rem;
  line-height: 1.7;
}

/* FOOTER */
.saas-footer {
  background: #ffffff;
  border-top: 1px solid var(--border-subtle);
  padding: 60px 0 30px;
  margin-top: 80px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Responsive Breakpoints */
@media (max-width: 991px) {
  .saas-nav-links {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: #ffffff;
    flex-direction: column;
    padding: 24px;
    gap: 12px;
    border-bottom: 1px solid var(--border-subtle);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transform: translateY(-150%);
    transition: transform 0.3s ease;
  }
  .saas-nav-links.active {
    transform: translateY(0);
  }
  .saas-nav-toggle {
    display: block;
  }
  .lms-container {
    grid-template-columns: 1fr;
  }
  .lms-sidebar {
    position: relative;
    top: 0;
    height: auto;
  }
  .saas-hero-title {
    font-size: 2.5rem;
  }
}