/*
 * Network Admin Guide - Main Stylesheet
 * Dark theme with teal accents
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@100;200;300;400;500;600;700;800;900&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Fira+Code:wght@300;400;500;600;700&display=swap');

/* Variables */
:root {
  /* Colors */
  --primary-dark: #0a192f;
  --secondary-dark: #112240;
  --accent-teal: #64ffda;
  --accent-blue: #58a6ff;
  --text-primary: #ccd6f6;
  --text-secondary: #8892b0;
  --text-muted: #495670;
  --success: #26d0ce;
  --warning: #ffd700;
  --danger: #f85149;
  --gradient-primary: linear-gradient(135deg, #0a192f 0%, #112240 100%);
  --gradient-accent: linear-gradient(135deg, #64ffda 0%, #58a6ff 100%);
  --gradient-glow: linear-gradient(90deg, transparent, rgba(100, 255, 218, 0.1), transparent);
  
  /* Typography */
  --font-primary: 'Inter', sans-serif;
  --font-code: 'Fira Code', monospace;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4rem;
  
  /* Animation */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-medium: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Layout */
  --container-max-width: 1200px;
  --border-radius: 8px;
  --border-radius-lg: 12px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 20px rgba(100, 255, 218, 0.3);
}

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

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

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

body {
  font-family: var(--font-primary);
  background: var(--primary-dark);
  color: var(--text-primary);
    line-height: 1.6;
  overflow-x: hidden;
  cursor: none;
}

/* Custom cursor */
.cursor {
  position: fixed;
  width: 20px;
  height: 20px;
  background: var(--accent-teal);
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  mix-blend-mode: difference;
  transition: transform var(--transition-fast);
  opacity: 0;
}

.cursor-outline {
  position: fixed;
  width: 40px;
  height: 40px;
  border: 2px solid rgba(100, 255, 218, 0.5);
  border-radius: 50%;
  pointer-events: none;
  z-index: 9998;
  transition: all var(--transition-medium);
  opacity: 0;
}

.cursor-hover {
  transform: scale(1.5);
  background: var(--accent-blue);
}

.cursor-outline-hover {
  transform: scale(1.2);
  border-color: var(--accent-blue);
}

/* === LOADING SCREEN === */
.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--primary-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  opacity: 1;
  transition: opacity var(--transition-slow);
}

.loading-animation {
  width: 60px;
  height: 60px;
  border: 3px solid rgba(100, 255, 218, 0.1);
  border-top: 3px solid var(--accent-teal);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* === CONTAINER === */
.container {
  max-width: var(--container-max-width);
    margin: 0 auto;
  padding: 0 var(--spacing-md);
  position: relative;
}

/* === HERO SECTION === */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
    overflow: hidden;
  background: var(--gradient-primary);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><defs><pattern id="grid" width="50" height="50" patternUnits="userSpaceOnUse"><path d="M 50 0 L 0 0 0 50" fill="none" stroke="rgba(100,255,218,0.1)" stroke-width="1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
  animation: float 20s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(0.5deg); }
}

.hero-content {
  text-align: center;
  z-index: 2;
  position: relative;
}

.hero-title {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 800;
  margin-bottom: var(--spacing-md);
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  opacity: 0;
  transform: translateY(50px);
}

.hero-subtitle {
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  opacity: 0;
  transform: translateY(30px);
}

.hero-cta {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-xl);
  background: transparent;
  border: 2px solid var(--accent-teal);
  color: var(--accent-teal);
  text-decoration: none;
  border-radius: var(--border-radius);
  font-weight: 600;
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
  opacity: 0;
  transform: translateY(20px);
}

.hero-cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--gradient-accent);
  transition: left var(--transition-medium);
  z-index: -1;
}

.hero-cta:hover::before {
  left: 0;
}

.hero-cta:hover {
  color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

/* === FLOATING PARTICLES === */
.particles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.particle {
  position: absolute;
  background: var(--accent-teal);
  border-radius: 50%;
  opacity: 0.6;
  animation: float-particle 6s ease-in-out infinite;
}

@keyframes float-particle {
  0%, 100% { 
    transform: translateY(0px) translateX(0px) scale(1);
    opacity: 0.6;
  }
  50% { 
    transform: translateY(-20px) translateX(10px) scale(1.1);
    opacity: 0.8;
  }
}

/* === NAVIGATION === */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--spacing-md) 0;
  background: rgba(10, 25, 47, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(100, 255, 218, 0.1);
  transform: translateY(-100%);
  transition: transform var(--transition-medium);
}

.navbar.visible {
  transform: translateY(0);
}

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

.nav-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-teal);
  text-decoration: none;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-teal);
  transition: width var(--transition-fast);
}

.nav-links a:hover {
  color: var(--accent-teal);
}

.nav-links a:hover::after {
  width: 100%;
}

/* === LANGUAGE SWITCHER === */
.language-switcher {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  display: flex;
  gap: var(--spacing-sm);
  z-index: 100;
}

.lang-btn {
  padding: var(--spacing-xs) var(--spacing-sm);
  background: rgba(100, 255, 218, 0.1);
  border: 1px solid rgba(100, 255, 218, 0.3);
  border-radius: var(--border-radius);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: all var(--transition-fast);
  backdrop-filter: blur(5px);
}

.lang-btn:hover,
.lang-btn.active {
  background: var(--accent-teal);
  color: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

/* === HEADER STYLES === */
.header {
  padding: var(--spacing-xl) 0;
    text-align: center;
  position: relative;
  overflow: hidden;
}

.header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient-glow);
  opacity: 0.5;
  animation: slide 3s ease-in-out infinite;
}

@keyframes slide {
  0%, 100% { transform: translateX(-100%); }
  50% { transform: translateX(100%); }
}

.header h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  position: relative;
  z-index: 2;
}

.header p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  position: relative;
  z-index: 2;
}

/* === OSI LAYER HEADERS === */
.header-l1 { background: linear-gradient(135deg, #e74c3c, #c0392b); }
.header-l2 { background: linear-gradient(135deg, #f39c12, #e67e22); }
.header-l3 { background: linear-gradient(135deg, #f1c40f, #f39c12); }
.header-l4 { background: linear-gradient(135deg, #2ecc71, #27ae60); }
.header-l5 { background: linear-gradient(135deg, #3498db, #2980b9); }
.header-l6 { background: linear-gradient(135deg, #9b59b6, #8e44ad); }
.header-l7 { background: linear-gradient(135deg, #1abc9c, #16a085); }

/* === PROBLEM GRID === */
.problems-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-xxl) 0;
}

.problem-card {
  background: var(--secondary-dark);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  border: 1px solid rgba(100, 255, 218, 0.1);
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
  opacity: 0;
  transform: translateY(50px);
}

.problem-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-medium);
}

.problem-card:hover::before {
  transform: scaleX(1);
}

.problem-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-teal);
}

.problem-number {
  display: inline-block;
  width: 40px;
  height: 40px;
  background: var(--gradient-accent);
  color: var(--primary-dark);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.problem-title {
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.problem-description {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
}

.problem-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.osi-layer {
  background: rgba(100, 255, 218, 0.1);
  color: var(--accent-teal);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  font-size: 0.9rem;
  font-weight: 500;
}

.difficulty {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  font-size: 0.9rem;
  font-weight: 500;
}

.difficulty.easy { background: rgba(46, 204, 113, 0.2); color: var(--success); }
.difficulty.medium { background: rgba(255, 215, 0, 0.2); color: var(--warning); }
.difficulty.hard { background: rgba(248, 81, 73, 0.2); color: var(--danger); }

.problem-links {
  display: flex;
  gap: var(--spacing-sm);
}

.btn {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
    text-decoration: none;
  font-weight: 500;
  transition: all var(--transition-fast);
  border: none;
  cursor: none;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--accent-teal);
  color: var(--primary-dark);
}

.btn-secondary {
  background: transparent;
  color: var(--accent-teal);
  border: 1px solid var(--accent-teal);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  background: var(--accent-blue);
  box-shadow: var(--shadow-glow);
}

/* === CONTENT SECTIONS === */
.content {
  padding: var(--spacing-xxl) 0;
}

.section {
  margin-bottom: var(--spacing-xxl);
  opacity: 0;
  transform: translateY(30px);
}

.section h2 {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
  color: var(--text-primary);
  position: relative;
}

.section h2::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 60px;
  height: 3px;
  background: var(--gradient-accent);
  border-radius: 2px;
}

.section h3 {
  font-size: 1.5rem;
  font-weight: 500;
  margin-bottom: var(--spacing-md);
  color: var(--accent-teal);
}

.section p {
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
  line-height: 1.7;
}

/* === CODE BLOCKS === */
.code-block {
  background: var(--secondary-dark);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
  border: 1px solid rgba(100, 255, 218, 0.1);
  position: relative;
    overflow-x: auto;
}

.code-block pre {
  font-family: var(--font-code);
  color: var(--text-primary);
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 0;
}

.command { color: var(--accent-teal); }
.comment { color: var(--text-muted); font-style: italic; }
.output { color: var(--text-secondary); }

/* === INFO BOXES === */
.info-box,
.warning-box,
.danger-box,
.packet-tracer-box {
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  margin: var(--spacing-lg) 0;
  border-left: 4px solid;
  position: relative;
  backdrop-filter: blur(5px);
}

.info-box {
  background: rgba(88, 166, 255, 0.1);
  border-color: var(--accent-blue);
  color: var(--text-primary);
}

.warning-box {
  background: rgba(255, 215, 0, 0.1);
  border-color: var(--warning);
  color: var(--text-primary);
}

.danger-box {
  background: rgba(248, 81, 73, 0.1);
  border-color: var(--danger);
  color: var(--text-primary);
}

.packet-tracer-box {
  background: rgba(100, 255, 218, 0.1);
  border-color: var(--accent-teal);
  color: var(--text-primary);
}

/* === IMAGE CONTAINERS === */
.image-container {
  margin: var(--spacing-xl) 0;
  text-align: center;
    position: relative;
}

.screenshot {
  max-width: 100%;
  height: auto;
  border-radius: var(--border-radius);
  border: 1px solid rgba(100, 255, 218, 0.2);
  transition: all var(--transition-medium);
}

.screenshot:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-lg);
}

figcaption {
  margin-top: var(--spacing-sm);
  color: var(--text-muted);
  font-style: italic;
  font-size: 0.9rem;
}

/* === NAVIGATION BUTTONS === */
.navigation {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--spacing-xxl);
  padding-top: var(--spacing-xl);
  border-top: 1px solid rgba(100, 255, 218, 0.1);
}

.nav-button {
  padding: var(--spacing-lg) var(--spacing-xl);  /* 2rem 3rem - Çok daha büyük! */
  background: var(--secondary-dark);
  color: var(--text-primary);
  text-decoration: none;
  border-radius: var(--border-radius-lg);
  border: 2px solid rgba(100, 255, 218, 0.4);
  transition: all var(--transition-medium);
  font-weight: 600;
  font-size: 1.1rem;  /* Daha büyük font */
  min-width: 140px;   /* Minimum genişlik */
  text-align: center;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.nav-button::before {
  content: '';
    position: absolute;
    top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(100, 255, 218, 0.1), transparent);
  transition: left var(--transition-medium);
  z-index: 0;
}

.nav-button:hover::before {
  left: 100%;
}

.nav-button:hover {
  background: var(--accent-teal);
  color: var(--primary-dark);
  transform: translateY(-3px) scale(1.02);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-teal);
}

.nav-button:active {
  transform: translateY(-1px) scale(0.98);
}

/* === BREADCRUMB === */
.breadcrumb {
  padding: var(--spacing-lg) 0;  /* Daha büyük padding */
  color: var(--text-muted);
  font-size: 1.1rem;  /* Daha büyük font */
  font-weight: 500;
}

.breadcrumb a {
  color: var(--accent-teal);
  text-decoration: none;
  transition: all var(--transition-fast);
  padding: var(--spacing-sm) var(--spacing-md);  /* Clickable area büyütme */
  border-radius: var(--border-radius);
  border: 1px solid transparent;
  display: inline-block;
  margin: 0 var(--spacing-xs);
}

.breadcrumb a:hover {
  color: var(--primary-dark);
  background: var(--accent-teal);
  border-color: var(--accent-teal);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.breadcrumb a:first-child {
  margin-left: 0;
}

/* === STATS SECTION === */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-xxl) 0;
}

.stat-card {
  background: var(--secondary-dark);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius);
  text-align: center;
  border: 1px solid rgba(100, 255, 218, 0.1);
  transition: all var(--transition-medium);
}

.stat-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-teal);
  box-shadow: var(--shadow-md);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent-teal);
  display: block;
}

.stat-label {
  color: var(--text-secondary);
  margin-top: var(--spacing-sm);
}

/* === RESPONSIVE DESIGN === */
@media (max-width: 768px) {
  .hero-title {
    font-size: 3rem;
  }
  
  .hero-subtitle {
    font-size: 1.2rem;
  }
  
  .problems-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .nav-links {
    display: none;
  }
  
  .language-switcher {
    top: var(--spacing-sm);
    right: var(--spacing-sm);
  }
  
  .navigation {
    flex-direction: column;
    gap: var(--spacing-lg);  /* Mobilde daha büyük gap */
  }
  
  .nav-button {
    padding: var(--spacing-md) var(--spacing-lg);  /* Mobilde biraz küçült ama hala büyük */
    font-size: 1rem;
    min-width: 120px;
  }
  
  .breadcrumb {
    text-align: center;  /* Mobilde ortalayalım */
  }
  
  .breadcrumb a {
    padding: var(--spacing-xs) var(--spacing-sm);  /* Mobilde biraz küçült */
    margin: var(--spacing-xs);
    font-size: 1rem;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .problem-meta {
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: flex-start;
  }
}

/* === SCROLL ANIMATIONS UTILITIES === */
.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: all var(--transition-slow);
}

.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: all var(--transition-slow);
}

.fade-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: all var(--transition-slow);
}

.fade-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* === SVG ANIMATION CONTAINERS === */
.svg-animation-container {
  width: 100%;
  max-width: 800px;
  margin: var(--spacing-xl) auto;
  background: var(--secondary-dark);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  border: 1px solid rgba(100, 255, 218, 0.1);
}

.svg-animation-container svg {
  width: 100%;
  height: auto;
  display: block;
}

/* === LOADING STATES === */
.loading {
  opacity: 0.6;
  pointer-events: none;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid rgba(100, 255, 218, 0.2);
  border-top-color: var(--accent-teal);
    border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* === ULTIMATE WEB SERVER TESTING LABORATORY === */
/* 🔥 FINAL PROBLEM 10 - BOMBA STYLING! 🔥 */
.web-lab-container {
  background: linear-gradient(135deg, #0a192f, #1a2b4a);
  border-radius: var(--border-radius-lg);
  border: 2px solid rgba(100, 255, 218, 0.3);
  margin: var(--spacing-xl) 0;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  position: relative;
}

.web-lab-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--accent-teal), transparent);
  animation: scan 3s ease-in-out infinite;
}

@keyframes scan {
  0% { left: -100%; }
  100% { left: 100%; }
}

/* Lab Header */
.lab-header {
    display: flex;
  justify-content: space-between;
    align-items: center;
  padding: var(--spacing-lg);
  background: linear-gradient(135deg, #112240, #0a192f);
  border-bottom: 1px solid rgba(100, 255, 218, 0.2);
}

.lab-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.lab-title h4 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--accent-teal);
  margin: 0;
}

.lab-status {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.status-indicator {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 10px var(--success);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.7; transform: scale(1.1); }
}

#lab-status-text {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.lab-controls {
  display: flex;
  gap: var(--spacing-sm);
}

.lab-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  border: none;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
    overflow: hidden;
}

.lab-btn.primary {
  background: linear-gradient(135deg, var(--accent-teal), var(--accent-blue));
  color: var(--primary-dark);
}

.lab-btn.secondary {
  background: rgba(100, 255, 218, 0.1);
  color: var(--accent-teal);
  border: 1px solid var(--accent-teal);
}

.lab-btn.tertiary {
  background: rgba(88, 166, 255, 0.1);
  color: var(--accent-blue);
  border: 1px solid var(--accent-blue);
}

.lab-btn:hover {
    transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

/* Lab Workspace */
.lab-workspace {
  display: flex;
  min-height: 700px;
}

.lab-sidebar {
  width: 280px;
  background: var(--secondary-dark);
  border-right: 1px solid rgba(100, 255, 218, 0.1);
  padding: var(--spacing-lg);
}

.tool-section h5,
.server-config h5 {
  color: var(--accent-teal);
  font-size: 1rem;
  margin-bottom: var(--spacing-md);
  font-weight: 600;
}

.tool-tabs {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-xl);
}

.tool-tab {
  padding: var(--spacing-sm);
  background: transparent;
  border: 1px solid rgba(100, 255, 218, 0.2);
  border-radius: var(--border-radius);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: left;
}

.tool-tab.active,
.tool-tab:hover {
  background: rgba(100, 255, 218, 0.1);
  color: var(--accent-teal);
  border-color: var(--accent-teal);
  transform: translateX(5px);
}

.config-item {
  margin-bottom: var(--spacing-md);
}

.config-item label {
    display: block;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: var(--spacing-xs);
}

.config-item input,
.config-item select {
  width: 100%;
  padding: var(--spacing-sm);
  background: var(--primary-dark);
  border: 1px solid rgba(100, 255, 218, 0.2);
  border-radius: var(--border-radius);
  color: var(--text-primary);
  font-family: var(--font-code);
}

.config-item input:focus,
.config-item select:focus {
  outline: none;
  border-color: var(--accent-teal);
  box-shadow: 0 0 5px rgba(100, 255, 218, 0.3);
}

/* Lab Main Area */
.lab-main {
  flex: 1;
  position: relative;
  background: var(--primary-dark);
}

.tool-panel {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--spacing-lg);
  opacity: 0;
  transform: translateX(20px);
  transition: all var(--transition-medium);
  pointer-events: none;
  overflow-y: auto;
}

.tool-panel.active {
  opacity: 1;
  transform: translateX(0);
  pointer-events: all;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid rgba(100, 255, 218, 0.1);
}

.panel-header h4 {
  color: var(--accent-teal);
  font-size: 1.2rem;
  margin: 0;
}

.action-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  border: none;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.action-btn.send {
  background: linear-gradient(135deg, #26d0ce, #1abc9c);
    color: white;
}

.action-btn.analyze {
  background: linear-gradient(135deg, #f39c12, #e67e22);
  color: white;
}

.action-btn.performance {
  background: linear-gradient(135deg, #e74c3c, #c0392b);
  color: white;
}

.action-btn.diagnostic {
  background: linear-gradient(135deg, #3498db, #2980b9);
  color: white;
}

.action-btn.monitor {
  background: linear-gradient(135deg, #9b59b6, #8e44ad);
  color: white;
}

.action-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

/* HTTP Request Builder */
.request-builder {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.request-headers h6,
.request-body h6 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.header-editor textarea,
.request-body textarea {
  width: 100%;
  height: 120px;
  background: var(--secondary-dark);
  border: 1px solid rgba(100, 255, 218, 0.2);
  border-radius: var(--border-radius);
  padding: var(--spacing-sm);
  color: var(--text-primary);
  font-family: var(--font-code);
  font-size: 0.9rem;
  resize: vertical;
}

/* Response Display */
.response-display {
  background: var(--secondary-dark);
  border-radius: var(--border-radius);
  border: 1px solid rgba(100, 255, 218, 0.1);
  overflow: hidden;
}

.response-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md);
  background: rgba(100, 255, 218, 0.05);
  border-bottom: 1px solid rgba(100, 255, 218, 0.1);
}

.response-status {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
}

.status-code {
  background: var(--success);
  color: var(--primary-dark);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  font-weight: 700;
  font-family: var(--font-code);
}

.status-text {
  color: var(--success);
  font-weight: 600;
}

.response-time {
  color: var(--accent-blue);
  font-family: var(--font-code);
  font-weight: 600;
}

.response-tabs {
  display: flex;
  background: rgba(100, 255, 218, 0.02);
  border-bottom: 1px solid rgba(100, 255, 218, 0.1);
}

.response-tab {
  padding: var(--spacing-sm) var(--spacing-md);
  background: transparent;
    border: none;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  border-bottom: 2px solid transparent;
}

.response-tab.active,
.response-tab:hover {
  color: var(--accent-teal);
  border-bottom-color: var(--accent-teal);
  background: rgba(100, 255, 218, 0.05);
}

.response-content {
  position: relative;
  min-height: 300px;
}

.response-panel {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--spacing-md);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
  overflow-y: auto;
}

.response-panel.active {
  opacity: 1;
  pointer-events: all;
}

.response-panel pre {
  font-family: var(--font-code);
  color: var(--text-secondary);
  font-size: 0.9rem;
  white-space: pre-wrap;
  word-break: break-word;
}

/* Timing Chart */
.timing-chart {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.timing-bar {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.timing-bar::before {
  content: attr(data-label);
  width: 100px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.bar-fill {
  height: 20px;
  background: linear-gradient(90deg, var(--accent-teal), var(--accent-blue));
  border-radius: var(--border-radius);
  position: relative;
  transition: width var(--transition-medium);
}

.timing-value {
  color: var(--text-primary);
  font-family: var(--font-code);
  font-size: 0.8rem;
  margin-left: var(--spacing-sm);
}

/* SSL Analyzer */
.ssl-overview {
  display: flex;
  gap: var(--spacing-xl);
  align-items: center;
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-lg);
  background: var(--secondary-dark);
  border-radius: var(--border-radius);
  border: 1px solid rgba(100, 255, 218, 0.1);
}

.ssl-grade {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.grade-circle {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--success), #1abc9c);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  color: white;
  box-shadow: 0 5px 15px rgba(38, 208, 206, 0.3);
}

.grade-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.grade-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.grade-desc {
  color: var(--accent-teal);
  font-weight: 600;
}

.ssl-details {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.ssl-item {
  display: flex;
  justify-content: space-between;
  padding: var(--spacing-xs) 0;
  border-bottom: 1px solid rgba(100, 255, 218, 0.1);
}

.ssl-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.ssl-value {
  color: var(--text-primary);
  font-family: var(--font-code);
  font-size: 0.9rem;
}

/* SSL Handshake Visualization */
.ssl-handshake-viz {
  background: var(--secondary-dark);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  border: 1px solid rgba(100, 255, 218, 0.1);
}

.handshake-steps {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.handshake-step {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: rgba(100, 255, 218, 0.05);
  border-radius: var(--border-radius);
  border: 1px solid rgba(100, 255, 218, 0.1);
  transition: all var(--transition-fast);
}

.handshake-step:hover {
  background: rgba(100, 255, 218, 0.1);
  transform: translateX(5px);
}

.step-number {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--accent-teal);
  color: var(--primary-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.step-content {
  flex: 1;
}

.step-title {
  color: var(--text-primary);
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.step-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.step-arrow {
  color: var(--accent-teal);
  font-size: 1.2rem;
  font-weight: 700;
}

/* Performance Testing */
.performance-config {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-lg);
  background: var(--secondary-dark);
  border-radius: var(--border-radius);
  border: 1px solid rgba(100, 255, 218, 0.1);
}

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

.perf-setting label {
  display: block;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
  font-size: 0.9rem;
}

.perf-setting input[type="range"] {
  width: 100%;
  margin-bottom: var(--spacing-sm);
}

.perf-setting span {
  color: var(--accent-teal);
  font-weight: 600;
  font-family: var(--font-code);
}

.perf-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.metric-card {
  text-align: center;
  padding: var(--spacing-lg);
  background: var(--secondary-dark);
  border-radius: var(--border-radius);
  border: 1px solid rgba(100, 255, 218, 0.1);
  transition: all var(--transition-fast);
}

.metric-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-teal);
}

.metric-value {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent-teal);
  font-family: var(--font-code);
  margin-bottom: var(--spacing-xs);
}

.metric-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.performance-chart {
  background: var(--secondary-dark);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  border: 1px solid rgba(100, 255, 218, 0.1);
}

/* Diagnostics Tools */
.diagnostic-tools {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.diag-tool {
  background: var(--secondary-dark);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  border: 1px solid rgba(100, 255, 218, 0.1);
}

.diag-tool h6 {
  color: var(--accent-teal);
  margin-bottom: var(--spacing-md);
  font-size: 1rem;
}

.tool-output {
  background: var(--primary-dark);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  border: 1px solid rgba(100, 255, 218, 0.1);
  font-family: var(--font-code);
  font-size: 0.9rem;
  max-height: 200px;
  overflow-y: auto;
}

.ping-result,
.trace-hop {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
}

.port-result {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--spacing-xs);
  padding: var(--spacing-xs);
  border-radius: var(--border-radius);
}

.port-result.open {
  background: rgba(38, 208, 206, 0.1);
  color: var(--success);
}

.port-result.closed {
  background: rgba(248, 81, 73, 0.1);
  color: var(--danger);
}

.port-result.filtered {
  background: rgba(255, 215, 0, 0.1);
  color: var(--warning);
}

/* Monitoring Dashboard */
.monitoring-dashboard {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.monitor-widgets {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
}

.widget {
  background: var(--secondary-dark);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  border: 1px solid rgba(100, 255, 218, 0.1);
  text-align: center;
  transition: all var(--transition-fast);
}

.widget:hover {
  transform: translateY(-3px);
  border-color: var(--accent-teal);
}

.widget h6 {
  color: var(--accent-teal);
  margin-bottom: var(--spacing-md);
  font-size: 0.9rem;
}

.status-indicator.online {
  background: var(--success);
  box-shadow: 0 0 10px var(--success);
}

.status-text {
  color: var(--success);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.uptime {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.gauge {
  position: relative;
  margin-bottom: var(--spacing-sm);
}

.gauge-value {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--accent-teal);
  font-weight: 700;
  font-family: var(--font-code);
}

.response-time-chart {
  margin-bottom: var(--spacing-sm);
}

.rt-value {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.error-percentage {
  font-size: 1.5rem;
  color: var(--warning);
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
}

.error-trend {
  color: var(--success);
  font-size: 0.9rem;
}

/* Live Logs */
.live-logs {
  background: var(--secondary-dark);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  border: 1px solid rgba(100, 255, 218, 0.1);
}

.live-logs h6 {
  color: var(--accent-teal);
  margin-bottom: var(--spacing-md);
}

.log-output {
  background: var(--primary-dark);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  border: 1px solid rgba(100, 255, 218, 0.1);
  max-height: 250px;
  overflow-y: auto;
  font-family: var(--font-code);
  font-size: 0.9rem;
}

.log-entry {
  margin-bottom: var(--spacing-xs);
  padding: var(--spacing-xs);
  border-radius: var(--border-radius);
}

.log-entry.info {
  color: var(--accent-blue);
  background: rgba(88, 166, 255, 0.05);
}

.log-entry.success {
  color: var(--success);
  background: rgba(38, 208, 206, 0.05);
}

.log-entry.warning {
  color: var(--warning);
  background: rgba(255, 215, 0, 0.05);
}

/* Lab Footer */
.lab-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg);
  background: var(--secondary-dark);
  border-top: 1px solid rgba(100, 255, 218, 0.1);
}

.test-summary h6 {
  color: var(--accent-teal);
  margin-bottom: var(--spacing-sm);
}

.summary-stats {
  display: flex;
  gap: var(--spacing-lg);
  font-size: 0.9rem;
}

.summary-stats span {
  color: var(--text-secondary);
}

.summary-stats strong {
  color: var(--text-primary);
  font-family: var(--font-code);
}

.lab-actions {
  display: flex;
  gap: var(--spacing-sm);
}

.lab-btn.save {
  background: rgba(38, 208, 206, 0.1);
  color: var(--success);
  border: 1px solid var(--success);
}

.lab-btn.load {
  background: rgba(88, 166, 255, 0.1);
  color: var(--accent-blue);
  border: 1px solid var(--accent-blue);
}

.lab-btn.report {
  background: rgba(155, 89, 182, 0.1);
  color: #9b59b6;
  border: 1px solid #9b59b6;
}

/* === RESPONSIVE LAB DESIGN === */
@media (max-width: 1024px) {
  .lab-workspace {
    flex-direction: column;
  }
  
  .lab-sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid rgba(100, 255, 218, 0.1);
  }
  
  .tool-tabs {
    flex-direction: row;
    overflow-x: auto;
  }
  
  .request-builder {
    grid-template-columns: 1fr;
  }
  
  .performance-config {
    grid-template-columns: 1fr;
  }
  
  .perf-metrics {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .monitor-widgets {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .lab-header {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .lab-controls {
    flex-wrap: wrap;
  }
  
  .lab-footer {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .summary-stats {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .perf-metrics {
    grid-template-columns: 1fr;
  }
  
  .monitor-widgets {
    grid-template-columns: 1fr;
  }
  
  .diagnostic-tools {
    grid-template-columns: 1fr;
  }
}

/* === UTILITIES === */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.hidden { display: none; }
.visible { display: block; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}