:root {
  --bg-color: #0d1117;
  --panel-bg: #161b22;
  --terminal-bg: #010409;
  --accent-color: #238636;
  --text-main: #c9d1d9;
  --text-dim: #8b949e;
  
  /* Syntax Highlighting */
  --keyword: #ff7b72;
  --function: #d2a8ff;
  --string: #a5d6ff;
  --number: #79c0ff;
  --comment: #8b949e;
  --builtin: #ffa657;
  
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-color);
}
::-webkit-scrollbar-thumb {
  background: #30363d;
  border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
  background: #484f58;
}

header {
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 2rem;
  background: radial-gradient(circle at top right, rgba(35, 134, 54, 0.1), transparent),
              radial-gradient(circle at bottom left, rgba(110, 118, 129, 0.05), transparent);
  text-align: center;
}

.hero-title {
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 800;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #fff, #8b949e);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: fadeInDown 1s ease-out;
}

.hero-subtitle {
  font-size: 1.5rem;
  color: var(--text-dim);
  max-width: 600px;
  margin-bottom: 2rem;
  animation: fadeInUp 1s ease-out 0.2s backwards;
}

.scroll-indicator {
  position: absolute;
  bottom: 30px;
  animation: bounce 2s infinite;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

section {
  margin-bottom: 6rem;
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s ease-out;
}

section.visible {
  opacity: 1;
  transform: translateY(0);
}

h2 {
  font-size: 2.5rem;
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

h2::before {
  content: '>>>';
  color: var(--accent-color);
  font-family: var(--font-mono);
  font-size: 1.5rem;
}

p {
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
  color: var(--text-main);
}

/* Terminal Styles */
.terminal-window {
  background-color: var(--terminal-bg);
  border: 1px solid #30363d;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0,0,0,0.5);
  margin: 2rem 0;
}

.terminal-header {
  background-color: #161b22;
  padding: 0.8rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: 1px solid #30363d;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}
.red { background-color: #ff5f56; }
.yellow { background-color: #ffbd2e; }
.green { background-color: #27c93f; }

.terminal-title {
  margin-left: 1rem;
  font-size: 0.8rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

.terminal-content {
  padding: 1.5rem;
  font-family: var(--font-mono);
  font-size: 1rem;
  overflow-x: auto;
}

.code-block {
  white-space: pre;
}

/* Syntax Highlighting */
.kw { color: var(--keyword); }
.func { color: var(--function); }
.str { color: var(--string); }
.num { color: var(--number); }
.com { color: var(--comment); }
.builtin { color: var(--builtin); }
.output { color: #fff; opacity: 0.7; }

.interactive-output {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px dashed #30363d;
  color: #27c93f;
}

/* Grid Layout */
.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

@media (max-width: 850px) {
  .grid {
    grid-template-columns: 1fr;
  }
}

/* Animations */
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {transform: translateY(0);}
  40% {transform: translateY(-10px);}
  60% {transform: translateY(-5px);}
}

.pulse {
  animation: pulse-animation 2s infinite;
}

@keyframes pulse-animation {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

footer {
  text-align: center;
  padding: 4rem;
  border-top: 1px solid #30363d;
  color: var(--text-dim);
}

/* Progress Bar */
#progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-color), #58a6ff);
  z-index: 1001;
  transition: width 0.1s linear;
}

/* Navigation Bar */
.nav-bar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid #30363d;
  padding: 0 2rem;
}

.nav-links {
  list-style: none;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.25rem;
  padding: 0.8rem 0;
}

.nav-links li a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.85rem;
  padding: 0.4rem 0.9rem;
  border-radius: 6px;
  transition: all 0.25s ease;
}

.nav-links li a:hover {
  color: #fff;
  background: rgba(35, 134, 54, 0.2);
}

.menu-toggle {
  display: none;
  font-size: 1.5rem;
  color: var(--text-main);
  cursor: pointer;
  padding: 0.8rem 0;
  text-align: center;
}

/* Inline code */
code {
  font-family: var(--font-mono);
  background: rgba(110, 118, 129, 0.15);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--builtin);
}

/* Lists */
ul {
  list-style: none;
  padding: 0;
}

ul li {
  color: var(--text-main);
  font-size: 1.05rem;
  line-height: 1.7;
}

/* Resources section cards */
.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.resource-card {
  background: var(--panel-bg);
  border: 1px solid #30363d;
  border-radius: 12px;
  padding: 2rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.resource-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
  border-color: var(--accent-color);
}

.resource-card h3 {
  font-size: 1.2rem;
  margin-bottom: 0.8rem;
  color: #fff;
}

.resource-card p {
  font-size: 0.95rem;
  color: var(--text-dim);
  margin-bottom: 1rem;
}

.resource-card a {
  color: var(--accent-color);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

.resource-card a:hover {
  color: #3fb950;
}

/* Responsive */
@media (max-width: 768px) {
  h2 {
    font-size: 1.6rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  h2::before {
    font-size: 1rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

  .container {
    padding: 2rem 1rem;
  }

  section {
    margin-bottom: 3rem;
  }

  .terminal-content {
    font-size: 0.8rem;
    padding: 1rem;
  }

  .menu-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    align-items: center;
    padding-bottom: 1rem;
  }

  .nav-links.active {
    display: flex;
  }
}

/* Interactive Playground */
#console-input {
  width: 100%;
  min-height: 160px;
  background: transparent;
  border: none;
  resize: vertical;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--text-main);
  outline: none;
  caret-color: var(--accent-color);
  line-height: 1.7;
  white-space: pre;
}

#console-input::placeholder {
  color: #484f58;
}

#console-output {
  white-space: pre-wrap;
  min-height: 2rem;
  font-family: var(--font-mono);
  font-size: 0.95rem;
}

.run-button {
  background: var(--accent-color);
  color: #fff;
  border: none;
  padding: 0.5rem 1.4rem;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.15s ease;
}

.run-button:hover {
  background: #3fb950;
  transform: scale(1.04);
}

.run-button:active {
  transform: scale(0.97);
}

.run-button.copied {
  background: #1f6feb;
}