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

:root {
  /* HSL Colors inspired by classic Turbo Pascal */
  --bg-primary: hsl(220, 50%, 6%);       /* Deep space blue background */
  --bg-secondary: hsl(218, 45%, 12%);     /* Card and secondary containers */
  --bg-tertiary: hsl(222, 38%, 18%);      /* Hover states and input fields */
  
  --accent-blue: hsl(215, 95%, 45%);      /* Vibrant classic blue */
  --accent-cyan: hsl(185, 100%, 50%);     /* Electric cyan highlight */
  --accent-yellow: hsl(45, 100%, 65%);    /* Retro yellow */
  --accent-green: hsl(140, 70%, 45%);     /* Borland button green */
  --accent-red: hsl(0, 85%, 55%);         /* Delete / warning red */
  
  --text-primary: hsl(210, 20%, 98%);     /* High-contrast off-white */
  --text-secondary: hsl(215, 15%, 72%);   /* Muted gray body text */
  --text-dimmed: hsl(215, 10%, 52%);      /* Dimmed utility text */

  --border-color: hsla(215, 95%, 45%, 0.2);
  --border-glow: hsla(185, 100%, 50%, 0.15);
  --border-radius: 8px;
  
  --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'Fira Code', 'Courier New', Courier, monospace;
  
  --container-width: 1200px;
  --transition-speed: 0.3s;
}

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

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

/* Glassmorphism Header */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: rgba(8, 14, 28, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: background var(--transition-speed);
}

.header-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  text-decoration: none;
}

.logo-img {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 2px solid var(--accent-cyan);
  box-shadow: 0 0 10px var(--border-glow);
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

nav {
  display: flex;
  gap: 2rem;
  align-items: center;
}

nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-speed);
}

nav a:hover, nav a.active {
  color: var(--accent-cyan);
}

nav a.active {
  border-bottom: 2px solid var(--accent-cyan);
  padding-bottom: 4px;
}

/* Hero Section */
.hero {
  position: relative;
  padding: 10rem 2rem 6rem;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

/* Background Gradients Glows */
.hero::before {
  content: '';
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, hsla(215, 95%, 45%, 0.15) 0%, transparent 70%);
  z-index: -1;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, hsla(185, 100%, 50%, 0.08) 0%, transparent 70%);
  z-index: -2;
  pointer-events: none;
}

.hero-tag {
  display: inline-block;
  padding: 0.4rem 1rem;
  border-radius: 50px;
  background: rgba(30, 41, 59, 0.5);
  border: 1px solid var(--border-color);
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 1.5rem;
}

h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  color: var(--text-primary);
  letter-spacing: -1px;
  margin-bottom: 1.5rem;
}

h1 span {
  background: linear-gradient(135deg, var(--accent-cyan) 30%, var(--accent-yellow) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 650px;
  margin: 0 auto 2.5rem;
}

.cta-group {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 4rem;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.8rem 1.8rem;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: all var(--transition-speed);
}

.btn-primary {
  background-color: var(--accent-green);
  color: var(--text-primary);
  border: 1px solid transparent;
  box-shadow: 0 4px 15px rgba(22, 101, 52, 0.2);
}

.btn-primary:hover {
  background-color: hsl(140, 75%, 38%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(22, 101, 52, 0.3);
}

.btn-secondary {
  background-color: rgba(30, 41, 59, 0.4);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background-color: rgba(30, 41, 59, 0.8);
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
}

/* Responsive Image Showcase Frame */
.showcase-frame {
  max-width: var(--container-width);
  margin: 0 auto 6rem;
  padding: 0 2rem;
}

.terminal-mockup {
  background: var(--bg-secondary);
  border: 2px solid var(--accent-blue);
  border-radius: var(--border-radius);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5), 0 0 30px var(--border-glow);
  overflow: hidden;
  transition: transform var(--transition-speed);
}

.terminal-header {
  display: none;
}

.terminal-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-primary);
  letter-spacing: 0.5px;
}

.terminal-dots {
  display: flex;
  gap: 0.4rem;
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.terminal-dot.close { background-color: var(--accent-red); }
.terminal-dot.minimize { background-color: var(--accent-yellow); }
.terminal-dot.maximize { background-color: var(--accent-green); }

.terminal-content a {
  display: block;
  cursor: zoom-in;
}

.terminal-content img {
  width: 100%;
  display: block;
  height: auto;
  border-bottom-left-radius: var(--border-radius);
  border-bottom-right-radius: var(--border-radius);
  transition: opacity var(--transition-speed);
}

.terminal-content a:hover img {
  opacity: 0.95;
}

/* Feature Grid */
.features-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 6rem 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-title {
  font-size: 2.25rem;
  color: var(--text-primary);
  font-weight: 800;
  margin-bottom: 1rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 2.5rem 2rem;
  border-radius: var(--border-radius);
  transition: all var(--transition-speed);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
  opacity: 0;
  transition: opacity var(--transition-speed);
}

.card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-cyan);
  box-shadow: 0 10px 30px rgba(8, 14, 28, 0.5), 0 0 20px var(--border-glow);
}

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

.card-icon {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  display: inline-block;
}

.card-title {
  font-size: 1.35rem;
  color: var(--text-primary);
  font-weight: 700;
  margin-bottom: 1rem;
}

.card-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

.card-link {
  color: var(--accent-cyan);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: gap var(--transition-speed);
}

.card-link:hover {
  gap: 0.6rem;
}

/* Detail Pages Split Layout */
.content-page {
  padding: 8rem 2rem 4rem;
  max-width: var(--container-width);
  margin: 0 auto;
}

.page-header {
  margin-bottom: 4rem;
}

.page-title {
  font-size: 3rem;
  color: var(--text-primary);
  font-weight: 800;
  margin-bottom: 1rem;
}

.page-desc {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 800px;
}

.detail-split {
  display: flex;
  gap: 4rem;
  margin-bottom: 6rem;
  align-items: center;
}

.detail-split.reverse {
  flex-direction: row-reverse;
}

.detail-info {
  flex: 1;
}

.detail-visual {
  flex: 1;
}

.detail-subtitle {
  font-size: 1.75rem;
  color: var(--text-primary);
  font-weight: 700;
  margin-bottom: 1.2rem;
}

.detail-text {
  margin-bottom: 1.5rem;
  font-size: 1rem;
}

.detail-list {
  list-style: none;
  margin-bottom: 2rem;
}

.detail-list li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.8rem;
  font-size: 0.95rem;
}

.detail-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
  font-weight: bold;
}

/* Code Highlight Block */
pre {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 1.5rem;
  border-radius: var(--border-radius);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-primary);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.keyword { color: var(--accent-cyan); }
.type { color: var(--accent-yellow); }
.literal { color: var(--accent-green); }
.comment { color: var(--text-dimmed); }

/* Quick Reference Table */
.table-container {
  overflow-x: auto;
  margin-bottom: 4rem;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  background: var(--bg-secondary);
  font-size: 0.95rem;
}

th, td {
  padding: 1rem 1.5rem;
}

th {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-weight: 600;
  border-bottom: 2px solid var(--border-color);
}

td {
  border-bottom: 1px solid var(--border-color);
}

tr:last-child td {
  border-bottom: none;
}

code {
  font-family: var(--font-mono);
  background: rgba(255, 255, 255, 0.05);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-size: 0.9rem;
  color: var(--accent-yellow);
}

/* Footer */
footer {
  background: var(--bg-secondary);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding: 4rem 2rem;
  margin-top: 6rem;
}

.footer-container {
  max-width: var(--container-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 2rem;
}

.footer-text {
  font-size: 0.9rem;
  color: var(--text-dimmed);
}

.footer-links {
  display: flex;
  gap: 2rem;
}

.footer-links a {
  color: var(--text-dimmed);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--transition-speed);
}

.footer-links a:hover {
  color: var(--accent-cyan);
}

/* Responsive adjustments */
@media (max-width: 900px) {
  h1 { font-size: 2.75rem; }
  .detail-split { flex-direction: column; gap: 2rem; }
  .detail-split.reverse { flex-direction: column; }
}

@media (max-width: 600px) {
  h1 { font-size: 2.25rem; }
  .cta-group { flex-direction: column; }
  .header-container { flex-direction: column; gap: 1rem; }
  nav { gap: 1rem; }
}