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

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: #0a0a0a;
  color: #ffffff;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* Background Animation */
.background-animation {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  opacity: 0.1;
}

.code-lines {
  position: absolute;
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(90deg, transparent, transparent 98px, #00ff41 100px);
  animation: scrollCode 20s linear infinite;
}

.glitch-lines {
  position: absolute;
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(0deg, transparent, transparent 48px, #ff0080 50px);
  animation: glitchMove 15s linear infinite reverse;
}

@keyframes scrollCode {
  0% {
    transform: translateX(-100px);
  }
  100% {
    transform: translateX(0);
  }
}

@keyframes glitchMove {
  0% {
    transform: translateY(-50px);
  }
  100% {
    transform: translateY(0);
  }
}

/* Progress Tracker */
.progress-tracker {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.8);
  border: 1px solid #00ff41;
  border-radius: 12px;
  padding: 15px;
  backdrop-filter: blur(10px);
}

.progress-badge {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.progress-icon {
  font-size: 24px;
  color: #00ff41;
  animation: pulse 2s infinite;
}

.progress-info {
  text-align: right;
}

.current-level {
  font-size: 14px;
  font-weight: bold;
  color: #00ff41;
}

.progress-text {
  font-size: 12px;
  color: #888;
}

.overall-progress {
  width: 120px;
  height: 6px;
  background: #333;
  border-radius: 3px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, #00ff41, #00cc33);
  border-radius: 3px;
  transition: width 0.3s ease;
}

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

/* Header */
.header {
  text-align: center;
  padding: 60px 20px 40px;
  background: linear-gradient(135deg, #1a1a1a, #0a0a0a);
}

.title {
  font-size: 3.5rem;
  font-weight: 700;
  background: linear-gradient(45deg, #00ff41, #00cc33, #0099ff);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 10px;
  text-shadow: 0 0 30px rgba(0, 255, 65, 0.3);
}

.subtitle {
  font-size: 1.2rem;
  color: #888;
  font-weight: 300;
  margin-bottom: 20px;
}

.progression-note {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 255, 65, 0.1);
  border: 1px solid rgba(0, 255, 65, 0.3);
  padding: 10px 20px;
  border-radius: 25px;
  font-size: 0.9rem;
  color: #00ff41;
}

.note-icon {
  font-size: 1.1rem;
}

/* Main Content */
.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px 60px;
}

.level-section {
  margin-bottom: 80px;
}

.level-title {
  font-size: 2rem;
  margin-bottom: 40px;
  color: #00ff41;
  text-align: center;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
}

.level-number {
  background: linear-gradient(45deg, #00ff41, #00cc33);
  color: #000;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 1.2rem;
}

.coming-soon-badge {
  background: rgba(255, 165, 0, 0.2);
  color: #ffa500;
  padding: 5px 15px;
  border-radius: 15px;
  font-size: 0.8rem;
  border: 1px solid rgba(255, 165, 0, 0.3);
}

/* Progression Path */
.progression-path {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}

.progression-line {
  width: 4px;
  height: 40px;
  background: linear-gradient(to bottom, #333, #555, #333);
  position: relative;
  margin: 10px 0;
}

.progression-line::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 12px;
  height: 12px;
  background: #333;
  border-radius: 50%;
  border: 2px solid #555;
}

.progression-line.future {
  background: linear-gradient(to bottom, #222, #333, #222);
  opacity: 0.5;
}

.progression-line.future::before {
  background: #222;
  border-color: #333;
}

/* Topic Cards */
.topic-card {
  position: relative;
  border-radius: 16px;
  padding: 25px;
  transition: all 0.3s ease;
  cursor: pointer;
  overflow: hidden;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
}

.topic-card.available {
  border-color: #00ff41;
  box-shadow: 0 0 20px rgba(0, 255, 65, 0.2);
}

.topic-card.available:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 20px 40px rgba(0, 255, 65, 0.3);
}

.topic-card.locked {
  opacity: 0.6;
  filter: grayscale(50%);
  cursor: not-allowed;
}

.topic-card.locked:hover {
  transform: none;
}

.topic-card.future {
  opacity: 0.4;
  filter: grayscale(70%) blur(1px);
}

.card-status {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 8px;
  background: #000;
  padding: 8px 15px;
  border-radius: 20px;
  border: 2px solid #333;
  z-index: 2;
}

.topic-card.available .card-status {
  border-color: #00ff41;
  background: linear-gradient(45deg, #00ff41, #00cc33);
  color: #000;
}

.status-indicator {
  font-size: 1.2rem;
}

.status-indicator.current {
  color: #000;
  animation: pulse 1.5s infinite;
}

.course-number {
  font-weight: bold;
  font-size: 0.9rem;
}

.card-content {
  position: relative;
  z-index: 1;
  padding-top: 20px;
}

.topic-card h3 {
  font-size: 1.4rem;
  margin-bottom: 12px;
  font-weight: 600;
  text-align: center;
}

.topic-card p {
  font-size: 0.95rem;
  line-height: 1.5;
  margin-bottom: 25px;
  opacity: 0.9;
  text-align: center;
}

.start-btn {
  width: 100%;
  padding: 12px;
  background: linear-gradient(45deg, #00ff41, #00cc33);
  color: #000;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

.start-btn:hover:not(:disabled) {
  background: linear-gradient(45deg, #00cc33, #00ff41);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 255, 65, 0.3);
}

.start-btn:disabled {
  background: #333;
  color: #666;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

/* Level 1 Cards */
.c-programming {
  background: linear-gradient(135deg, #1a4d1a, #0d2d0d);
  color: #90ee90;
}

.python-basics {
  background: linear-gradient(135deg, #4d1a1a, #2d0d0d);
  color: #ff6b6b;
}

.python-hacking {
  background: linear-gradient(135deg, #1a3d4d, #0d1f2d);
  color: #00bfff;
}

/* Level 2 Cards */
.networking-fundamentals {
  background: linear-gradient(135deg, #1a3d4d, #0d2d3d);
  color: #87ceeb;
}

.osi-tcp {
  background: linear-gradient(135deg, #3d1a4d, #2d0d3d);
  color: #dda0dd;
}

.protocols {
  background: linear-gradient(135deg, #4d1a3d, #2d0d1f);
  color: #ffb6c1;
}

.subnetting {
  background: linear-gradient(135deg, #4d4d1a, #2d2d0d);
  color: #ffd700;
}

.packet-analysis {
  background: linear-gradient(135deg, #4d3d1a, #2d1f0d);
  color: #daa520;
}

.network-attacks {
  background: linear-gradient(135deg, #4d1a4d, #2d0d2d);
  color: #ff00ff;
  position: relative;
}

.network-attacks::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, transparent 30%, rgba(255, 0, 255, 0.1) 50%, transparent 70%);
  animation: glitchSweep 3s infinite;
}

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

/* Level 3 Cards */
.nmap {
  background: linear-gradient(135deg, #1a1a4d, #0d0d2d);
  color: #00bfff;
  position: relative;
}

.nmap::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100px;
  height: 100px;
  background: radial-gradient(circle, rgba(0, 191, 255, 0.3), transparent);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  animation: pulse 2s infinite;
}

.wireshark {
  background: linear-gradient(135deg, #0d2d4d, #051a2d);
  color: #4682b4;
  position: relative;
  overflow: hidden;
}

.wireshark::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at center, rgba(70, 130, 180, 0.1) 0%, transparent 70%);
  animation: ripple 4s infinite;
}

@keyframes ripple {
  0% {
    transform: scale(0.8);
    opacity: 1;
  }
  100% {
    transform: scale(1.2);
    opacity: 0;
  }
}

.burp-suite {
  background: linear-gradient(135deg, #4d1a2d, #2d0d1a);
  color: #ff69b4;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 105, 180, 0.3);
}

.netcat {
  background: linear-gradient(135deg, #2d1a4d, #1a0d2d);
  color: #9370db;
}

.netcat:hover {
  background: linear-gradient(135deg, #9370db, #2d1a4d);
  color: #000;
}

.custom-tools {
  background: linear-gradient(135deg, #1a4d1a, #0d2d0d);
  color: #00ff00;
  position: relative;
  overflow: hidden;
}

.custom-tools::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: repeating-linear-gradient(
      90deg,
      transparent,
      transparent 2px,
      rgba(0, 255, 0, 0.03) 2px,
      rgba(0, 255, 0, 0.03) 4px
    ),
    repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(0, 255, 0, 0.03) 2px, rgba(0, 255, 0, 0.03) 4px);
  animation: matrixMove 10s linear infinite;
}

@keyframes matrixMove {
  0% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(4px, 4px);
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .title {
    font-size: 2.5rem;
  }

  .subtitle {
    font-size: 1rem;
  }

  .progression-note {
    flex-direction: column;
    text-align: center;
    gap: 5px;
  }

  .level-title {
    flex-direction: column;
    gap: 10px;
  }

  .progress-tracker {
    top: 10px;
    right: 10px;
    padding: 10px;
  }

  .overall-progress {
    width: 100px;
  }

  .topic-card {
    max-width: 100%;
  }
}

@media (max-width: 480px) {
  .header {
    padding: 40px 15px 30px;
  }

  .title {
    font-size: 2rem;
  }

  .main-content {
    padding: 0 15px 40px;
  }

  .topic-card {
    padding: 20px;
  }

  .level-number {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }
}