/* ==========================================================================
   styles.css: Master Stylesheet for Techknowconsultant Academy
   Combined from max.css, min.css, animations.css, and responsive.css
   ========================================================================== */

/* 1. Default Light Theme Variables */
:root {
  --color-scheme: light;
  
  --bg-main: #F4F7FB;
  --bg-card: #FFFFFF;
  --bg-card-hover: #FFFFFF;
  --bg-surface: #FFFFFF;
  --bg-surface-alt: #F8FAFC;
  
  /* High-Contrast Text Colors */
  --text-main: #020617;
  --text-muted: #334155;
  --text-dark: #000000;
  
  /* Enterprise Blue Palette */
  --primary: #1E40AF;
  --primary-hover: #1D4ED8;
  --accent: #2563EB;
  --accent-glow: rgba(37, 99, 235, 0.25);
  --success: #047857;
  
  --border-color: #CBD5E1;
  --border-light: #E2E8F0;
  
  /* Standard Box Shadows & Navigation */
  --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.1);
  --shadow-hover: 0 8px 20px rgba(15, 23, 42, 0.15);
  --shadow-3d-sm: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
  --shadow-3d-hover: 0 20px 35px -5px rgba(37, 99, 235, 0.15), 0 10px 10px -5px rgba(37, 99, 235, 0.04);
  
  --nav-bg: rgba(255, 255, 255, 0.95);
  --hero-bg: radial-gradient(circle at 70% 30%, #EFF6FF 0%, #F4F7FB 70%);

  /* Typography & Layout */
  --font-heading: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --container-max: 1240px;
  --header-height: 80px;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s ease-in-out;
}

/* 2. Automatic OS/Browser Dark Mode Detection */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-scheme: dark;
    --bg-main: #0B0F17;
    --bg-card: #111827;
    --bg-card-hover: #1E293B;
    --bg-surface: #0F172A;
    --bg-surface-alt: #1E293B;
    
    --text-main: #F8FAFC;
    --text-muted: #94A3B8;
    --text-dark: #FFFFFF;
    
    --primary: #3B82F6;
    --primary-hover: #60A5FA;
    --accent: #60A5FA;
    --accent-glow: rgba(96, 165, 250, 0.3);
    --success: #10B981;
    
    --border-color: #1E293B;
    --border-light: #334155;
    
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.55);
    --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.7);
    --shadow-3d-sm: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
    --shadow-3d-hover: 0 20px 35px -5px rgba(96, 165, 250, 0.2);
    
    --nav-bg: rgba(15, 23, 42, 0.95);
    --hero-bg: radial-gradient(circle at 70% 30%, #172554 0%, #0B0F17 70%);
  }
}

/* 3. Explicit Dark Theme Override */
[data-theme="dark"] {
  --color-scheme: dark;
  --bg-main: #0B0F17;
  --bg-card: #111827;
  --bg-card-hover: #1E293B;
  --bg-surface: #0F172A;
  --bg-surface-alt: #1E293B;
  
  --text-main: #F8FAFC;
  --text-muted: #94A3B8;
  --text-dark: #FFFFFF;
  
  --primary: #3B82F6;
  --primary-hover: #60A5FA;
  --accent: #60A5FA;
  --accent-glow: rgba(96, 165, 250, 0.3);
  --success: #10B981;
  
  --border-color: #1E293B;
  --border-light: #334155;
  
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.55);
  --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.7);
  --shadow-3d-sm: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
  --shadow-3d-hover: 0 20px 35px -5px rgba(96, 165, 250, 0.2);
  
  --nav-bg: rgba(15, 23, 42, 0.95);
  --hero-bg: radial-gradient(circle at 70% 30%, #172554 0%, #0B0F17 70%);
}

/* 4. Explicit Light Theme Override */
[data-theme="light"] {
  --color-scheme: light;
  --bg-main: #F4F7FB;
  --bg-card: #FFFFFF;
  --bg-card-hover: #FFFFFF;
  --bg-surface: #FFFFFF;
  --bg-surface-alt: #F8FAFC;
  
  --text-main: #020617;
  --text-muted: #334155;
  --text-dark: #000000;
  
  --primary: #1E40AF;
  --primary-hover: #1D4ED8;
  --accent: #2563EB;
  --accent-glow: rgba(37, 99, 235, 0.25);
  --success: #047857;
  
  --border-color: #CBD5E1;
  --border-light: #E2E8F0;
  
  --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.1);
  --shadow-hover: 0 8px 20px rgba(15, 23, 42, 0.15);
  --shadow-3d-sm: 0 10px 25px -5px rgba(15, 23, 42, 0.08);
  --shadow-3d-hover: 0 20px 35px -5px rgba(37, 99, 235, 0.15);
  
  --nav-bg: rgba(255, 255, 255, 0.95);
  --hero-bg: radial-gradient(circle at 70% 30%, #EFF6FF 0%, #F4F7FB 70%);
}

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

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

body {
  font-family: var(--font-body);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

a {
  color: inherit;
  text-decoration: none;
}

ul { 
  list-style: none; 
}

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

/* Base Layout Classes */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section-padding { 
  padding: clamp(3.5rem, 8vw, 6rem) 0; 
}

.text-gradient {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 50%, var(--primary-hover) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-center { text-align: center; }

/* Margins */
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mb-6 { margin-bottom: 3rem; }

/* Layout Grids */
.grid-2 { 
  display: grid; 
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 480px), 1fr)); 
  gap: 2.5rem; 
}

.grid-3 { 
  display: grid; 
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); 
  gap: 2.5rem; 
}

.grid-4 { 
  display: grid; 
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr)); 
  gap: 2rem; 
}

/* Theme Elements & Overrides */
.hero-wrapper {
  background: var(--hero-bg) !important;
}

.card {
  background: var(--bg-card) !important;
  border-color: var(--border-color) !important;
}

.dropdown-content {
  background-color: var(--bg-card) !important;
  border-color: var(--border-color) !important;
}

.footer {
  background-color: var(--bg-surface) !important;
  border-color: var(--border-color) !important;
}

.social-icon-btn {
  background: var(--bg-surface-alt) !important;
  border-color: var(--border-color) !important;
  color: var(--text-main) !important;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

/* ==========================================================================
   3D UI Components (Cards, Buttons, Canvas & Depth Layers)
   ========================================================================== */

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--primary);
  color: #FFFFFF;
  padding: 8px 16px;
  z-index: 2000;
}

.section-header {
  max-width: 700px;
  margin: 0 auto 3.5rem auto;
  text-align: center;
  transform-style: preserve-3d;
}

.badge {
  display: inline-block;
  padding: 0.4rem 1.25rem;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.12) 0%, rgba(30, 64, 175, 0.05) 100%);
  border: 1px solid rgba(37, 99, 235, 0.3);
  color: var(--primary);
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1rem;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.08);
  transform: translateZ(10px);
}

/* 3D Interactive Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.95rem 2rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: none;
  white-space: nowrap;
  transform-style: preserve-3d;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  position: relative;
}

.btn-primary { 
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%); 
  color: #FFFFFF; 
  box-shadow: 0 8px 20px -4px rgba(37, 99, 235, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.btn-primary:active {
  transform: translateY(2px) scale(0.98);
  box-shadow: 0 4px 10px -2px rgba(37, 99, 235, 0.4);
}

.btn-secondary {
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  color: var(--text-main);
  box-shadow: 0 6px 16px -4px rgba(15, 23, 42, 0.08), inset 0 1px 0 #FFFFFF;
}

/* 3D Floating Cards */
.card {
  background: linear-gradient(145deg, #FFFFFF 0%, #F8FAFC 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: clamp(1.75rem, 4vw, 2.5rem);
  box-shadow: var(--shadow-3d-sm);
  transform-style: preserve-3d;
  transition: transform 0.15s cubic-bezier(0.2, 0, 0.2, 1), box-shadow 0.2s ease, border-color 0.2s ease;
  position: relative;
  will-change: transform;
}

/* Depth Layers inside Cards */
.card-layer-3d-icon {
  transform: translateZ(30px);
  transition: transform 0.3s ease;
}

.card-layer-3d-title {
  transform: translateZ(20px);
  transition: transform 0.3s ease;
}

.card-layer-3d-body {
  transform: translateZ(10px);
  transition: transform 0.3s ease;
}

/* Hero & Background Canvas */
.hero-wrapper {
  padding-top: calc(var(--header-height) + clamp(2rem, 5vw, 4rem));
  padding-bottom: clamp(3rem, 6vw, 6rem);
  position: relative;
  overflow: hidden;
  background: radial-gradient(circle at 70% 30%, #EFF6FF 0%, #F4F7FB 70%);
  transform-style: preserve-3d;
}

#hero-3d-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.85;
}

.hero-content-3d {
  position: relative;
  z-index: 1;
  transform-style: preserve-3d;
}

.hero-title { 
  font-size: clamp(2.25rem, 5vw, 3.5rem); 
  transform: translateZ(25px);
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0; left: 0; width: 100%;
  height: var(--header-height);
  background-color: var(--nav-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  z-index: 1000;
  display: flex;
  align-items: center;
  box-shadow: 0 4px 20px -5px rgba(15, 23, 42, 0.05);
}

.nav-container { display: flex; align-items: center; justify-content: space-between; width: 100%; }
.logo { display: flex; align-items: center; gap: 0.75rem; font-family: var(--font-heading); font-weight: 800; font-size: 1.25rem; color: var(--text-main); }
.brand-logo-img { height: 42px; width: auto; object-fit: contain; filter: drop-shadow(0 4px 6px rgba(0,0,0,0.08)); }

.nav-links { display: flex; align-items: center; gap: 1.5rem; }
.nav-link { font-weight: 500; font-size: 0.9rem; color: var(--text-muted); position: relative; }
.nav-link.active { color: var(--primary); font-weight: 700; }
.nav-link.active::after { content: ''; position: absolute; bottom: -6px; left: 0; width: 100%; height: 3px; background: linear-gradient(90deg, var(--primary), var(--accent)); border-radius: 2px; }

/* Dropdown 3D Menu */
.nav-dropdown { position: relative; display: inline-block; }
.nav-dropdown .dropdown-toggle { background: none; border: none; font: inherit; cursor: pointer; display: flex; align-items: center; padding: 0; height: 100%; }
.dropdown-content {
  display: none;
  position: absolute;
  background-color: #FFFFFF;
  min-width: 190px;
  box-shadow: 0 15px 35px rgba(15, 23, 42, 0.12);
  border: 1px solid var(--border-color);
  z-index: 100;
  border-radius: var(--radius-sm);
  top: 100%; 
  left: 0;
  padding: 0.5rem 0;
  transform-origin: top center;
  animation: dropdown3D 0.25s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.dropdown-content .dropdown-item { color: var(--text-main); padding: 10px 16px; display: block; font-size: 0.95rem; font-weight: 500; }

.nav-actions { display: flex; align-items: center; gap: 1rem; }
.mobile-toggle { display: none; background: none; border: none; color: var(--text-main); cursor: pointer; padding: 0.5rem; }

/* Footer */
.footer { background-color: #FFFFFF; border-top: 1px solid var(--border-color); padding: 5rem 0 2rem 0; margin-top: 4rem; position: relative; z-index: 1; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 3rem; margin-bottom: 4rem; }
.footer-brand p { color: var(--text-muted); margin-top: 1rem; max-width: 420px; font-size: 0.95rem; }
.footer-title { font-size: 1rem; font-weight: 700; margin-bottom: 1.25rem; color: var(--text-main); text-transform: uppercase;}
.footer-links { display: flex; flex-direction: column; gap: 0.75rem; }
.footer-links a { color: var(--text-muted); font-size: 0.9rem; }
.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-muted);
  font-size: 0.875rem;
  text-align: center;
}
.footer-bottom a { color: var(--text-muted); text-decoration: underline; }

/* Social Icons */
.social-links { display: flex; gap: 1rem; margin-top: 1.5rem; }
.social-icon-btn {
  width: 42px; height: 42px;
  background: #F8FAFC;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-main);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.04);
  transform-style: preserve-3d;
}

/* Print Handling */
@page { size: A4 landscape; margin: 0; }
@media print {
  html, body {
    width: 297mm !important;
    height: 210mm !important;
    background: #FFFFFF !important;
    color: #111827 !important;
    margin: 0 !important;
    padding: 0 !important;
    overflow: hidden !important;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }
  body * { visibility: hidden; }
  #certificateArea, #certificateArea * { visibility: visible; }
  #certificateArea {
    position: fixed;
    left: 10mm; top: 10mm;
    width: 277mm !important;
    height: 190mm !important;
    box-sizing: border-box;
    color: #111827 !important;
    background: #FFFFFF !important;
    padding: 20mm;
    border: 8px solid #0284C7;
    border-radius: 12px;
    display: flex !important;
    flex-direction: column !important;
    justify-content: space-between !important;
    text-align: center;
  }
  .no-print { display: none !important; }
}

/* ==========================================================================
   3D Keyframe Animations, Tilt Effects & Hover Dynamics
   ========================================================================== */

/* Global Smooth Transitions */
body, .navbar, .card, .btn, .social-icon-btn, .form-control {
  transition: all var(--transition-normal);
}

a, .nav-link {
  transition: color var(--transition-fast);
}

/* 3D Hover Actions */
.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-hover) 0%, var(--accent) 100%);
  box-shadow: 0 14px 28px -6px rgba(37, 99, 235, 0.45), 0 0 15px var(--accent-glow);
  transform: translateY(-3px) translateZ(10px);
}

.btn-secondary:hover {
  background: #FFFFFF;
  border-color: var(--accent);
  color: var(--primary);
  box-shadow: 0 10px 22px -6px rgba(15, 23, 42, 0.12);
  transform: translateY(-3px) translateZ(10px);
}

.card:hover {
  border-color: var(--card-depth-border);
  box-shadow: var(--shadow-3d-hover);
}

.social-icon-btn:hover { 
  background: #FFFFFF; 
  border-color: var(--accent); 
  color: var(--primary); 
  transform: translateY(-4px) translateZ(15px) rotateY(10deg); 
  box-shadow: 0 10px 20px -4px rgba(37, 99, 235, 0.2);
}

/* Focus Actions */
.form-control:focus { 
  outline: none; 
  border-color: var(--accent); 
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.15), 0 8px 16px -4px rgba(37, 99, 235, 0.1); 
  transform: translateY(-2px);
}

/* Nav Hover */
.nav-link:hover { color: var(--primary); }
.dropdown-content .dropdown-item:hover {
  background-color: rgba(37, 99, 235, 0.08); 
  color: var(--primary);
  transform: translateX(4px);
}

.nav-dropdown:hover .dropdown-content {
  display: block;
}

/* 3D Keyframe Animations */
@keyframes dropdown3D {
  0% {
    opacity: 0;
    transform: perspective(600px) rotateX(-15deg) translateY(-10px);
  }
  100% {
    opacity: 1;
    transform: perspective(600px) rotateX(0deg) translateY(0);
  }
}

@keyframes float3D {
  0%, 100% {
    transform: translateY(0px) rotateX(0deg) rotateY(0deg);
  }
  50% {
    transform: translateY(-10px) rotateX(2deg) rotateY(-2deg);
  }
}

.float-3d {
  animation: float3D 6s ease-in-out infinite;
}

/* ==========================================================================
   Media Queries & Mobile 3D Optimizations
   ========================================================================== */

/* Retina & High-DPI screens */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .card, .navbar, .btn { border-width: 0.5px; }
}

/* 4K & Ultra-Wide Monitor Scaling */
@media (min-width: 2560px) {
  html { font-size: 18px; }
  .container { max-width: 1440px; }
}

@media (min-width: 3840px) {
  html { font-size: 22px; }
  .container { max-width: 1800px; }
}

/* Tablet view */
@media (max-width: 1024px) {
  .nav-links { gap: 1rem; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

/* Mobile & Small screens */
@media (max-width: 900px) {
  .mobile-toggle { display: block; }
  
  .nav-menu {
    position: fixed;
    top: var(--header-height); 
    left: 0; 
    width: 100%;
    height: calc(100vh - var(--header-height));
    background-color: #FFFFFF;
    flex-direction: column; 
    align-items: flex-start;
    padding: 2rem; 
    gap: 1.5rem;
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
  }
  
  .nav-menu.open { transform: translateX(0); }
  .nav-links { flex-direction: column; align-items: flex-start; width: 100%; }
  .footer-grid { grid-template-columns: 1fr; }
  
  /* Disable heavy 3D transforms on mobile for performance */
  :root {
    --perspective: none;
  }
  .card {
    transform: none !important;
  }
}