:root {
  --pink-50: #fff1f5;
  --pink-100: #ffe4ef;
  --pink-200: #ffcce0;
  --pink-300: #ffa8c8;
  --pink-400: #ff69b4;
  --pink-500: #ff1493;
  --pink-600: #e91082;
  --pink-700: #d40e74;
  --pink-800: #b80c65;
  --pink-900: #9a0a55;
  --pink-neon: #ff3ec4;
  --white: #ffffff;
  --shadow: 0 1px 3px rgba(255,20,147,0.15), 0 1px 2px rgba(255,20,147,0.08);
  --shadow-lg: 0 10px 25px rgba(255,20,147,0.2), 0 4px 10px rgba(255,20,147,0.1);
}

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

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: linear-gradient(180deg, var(--pink-50) 0%, var(--pink-100) 100%);
  color: var(--pink-900);
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--pink-500); text-decoration: none; }
a:hover { color: var(--pink-700); text-decoration: underline; }

/* Navigation */
nav {
  background: linear-gradient(90deg, var(--pink-600), var(--pink-500), var(--pink-600));
  padding: 0 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 4px 20px rgba(255,20,147,0.3);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-brand {
  color: var(--white);
  font-weight: 800;
  font-size: 1.4rem;
  letter-spacing: -0.5px;
  padding: 1rem 0;
}

.nav-links { display: flex; gap: 0.25rem; flex-wrap: wrap; }

.nav-links a {
  color: var(--pink-100);
  padding: 0.6rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: background 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  background: var(--pink-800);
  color: var(--white);
  text-decoration: none;
  box-shadow: 0 0 10px rgba(255,62,196,0.3);
}

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--pink-500), var(--pink-600), var(--pink-700));
  color: var(--white);
  text-align: center;
  padding: 5rem 2rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 60%);
  animation: heroShine 8s ease-in-out infinite;
}

@keyframes heroShine {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(20%, 10%); }
}

.hero h1 { font-size: 3rem; font-weight: 800; margin-bottom: 0.5rem; position: relative; }
.hero p { font-size: 1.2rem; opacity: 0.95; max-width: 600px; margin: 0 auto; position: relative; }

/* Container */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* Cards grid */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.card {
  background: var(--white);
  border-radius: 16px;
  padding: 1.8rem;
  box-shadow: var(--shadow-lg);
  border: 2px solid var(--pink-300);
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 15px 35px rgba(255,20,147,0.25);
  border-color: var(--pink-400);
}

.card h3 {
  color: var(--pink-600);
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.card p { color: var(--pink-800); font-size: 0.95rem; }

/* Section heading */
h2.section-title {
  font-size: 1.9rem;
  color: var(--pink-700);
  margin: 2.5rem 0 0.8rem;
  border-bottom: 3px solid var(--pink-400);
  padding-bottom: 0.5rem;
}

/* Glossary table */
.glossary-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
  background: var(--white);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 2px solid var(--pink-200);
}

.glossary-table thead {
  background: linear-gradient(90deg, var(--pink-500), var(--pink-600));
  color: var(--white);
}

.glossary-table th,
.glossary-table td {
  padding: 0.9rem 1.2rem;
  text-align: left;
  font-size: 0.95rem;
}

.glossary-table tbody tr { border-bottom: 1px solid var(--pink-200); }
.glossary-table tbody tr:hover { background: var(--pink-100); }
.glossary-table td:first-child { font-weight: 700; color: var(--pink-600); white-space: nowrap; }

/* Definition card */
.def-card {
  background: var(--white);
  border-radius: 16px;
  padding: 1.5rem 2rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-lg);
  border-left: 5px solid var(--pink-500);
  border: 2px solid var(--pink-200);
  transition: border-color 0.2s;
}

.def-card:hover {
  border-color: var(--pink-400);
}

.def-card h3 {
  color: var(--pink-700);
  font-size: 1.15rem;
  margin-bottom: 0.3rem;
}

.def-card .category {
  display: inline-block;
  background: linear-gradient(135deg, var(--pink-400), var(--pink-500));
  color: var(--white);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.2rem 0.7rem;
  border-radius: 999px;
  margin-bottom: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.def-card p { color: var(--pink-900); font-size: 0.95rem; }

/* Example block */
.example {
  background: linear-gradient(135deg, var(--pink-100), var(--pink-200));
  border-radius: 10px;
  padding: 0.8rem 1rem;
  margin-top: 0.5rem;
  font-family: 'Courier New', monospace;
  font-size: 0.88rem;
  color: var(--pink-900);
  border: 1px solid var(--pink-300);
}

.example strong { font-family: 'Segoe UI', system-ui, sans-serif; color: var(--pink-700); }

/* Use-case grid */
.use-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.use-card {
  background: var(--white);
  border-radius: 16px;
  padding: 1.8rem;
  box-shadow: var(--shadow-lg);
  text-align: center;
  border: 2px solid var(--pink-200);
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}

.use-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 15px 35px rgba(255,20,147,0.25);
  border-color: var(--pink-400);
}

.use-card .icon { font-size: 2.8rem; margin-bottom: 0.5rem; }
.use-card h3 { color: var(--pink-700); margin-bottom: 0.4rem; }
.use-card p { color: var(--pink-900); font-size: 0.9rem; margin-bottom: 0.8rem; }

/* Prompt examples */
.prompt-block {
  background: var(--white);
  border-radius: 16px;
  padding: 1.5rem 2rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-lg);
  border: 2px solid var(--pink-200);
  transition: border-color 0.2s;
}

.prompt-block:hover {
  border-color: var(--pink-400);
}

.prompt-block h3 {
  color: var(--pink-700);
  margin-bottom: 0.5rem;
}

.prompt-block .label {
  font-weight: 700;
  color: var(--pink-500);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Footer */
footer {
  background: linear-gradient(90deg, var(--pink-700), var(--pink-600), var(--pink-700));
  color: var(--pink-200);
  text-align: center;
  padding: 1.8rem;
  font-size: 0.9rem;
  box-shadow: 0 -4px 20px rgba(255,20,147,0.3);
}