:root {
  --bg: #fff7f5;
  --text: #2b1e2f;
  --card: #ffffff;
  --accent: #8e44ad;
  --accent-soft: #ff6f61;
}

body.dark {
  --bg: #1a0f1f;
  --text: #f8e9ff;
  --card: #2a1530;
  --accent: #c77dff;
  --accent-soft: #ff8fa3;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: background 0.4s ease, color 0.4s ease;
  line-height:1.6;
}

/* NAVBAR */
nav {
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:1rem 2rem;
  background: var(--card);
  box-shadow:0 5px 20px rgba(142,68,173,0.08);
  position:sticky;
  top:0;
  z-index:100;
  animation: slideDown 0.6s ease-out;
}

@keyframes slideDown {
  from { transform: translateY(-100%); opacity:0; }
  to { transform: translateY(0); opacity:1; }
}

nav h1 {
  font-size:1.3rem;
}

nav ul {
  display:flex;
  list-style:none;
  gap:1.5rem;
}

nav a {
  text-decoration:none;
  color:var(--text);
  font-weight:500;
  position:relative;
}

nav a::after {
  content:"";
  position:absolute;
  width:0%;
  height:2px;
  background:linear-gradient(135deg,var(--accent),var(--accent-soft));
  left:0;
  bottom:-4px;
  transition:0.3s;
}

nav a:hover::after {
  width:100%;
}

/* BUTTON */
.toggle-btn {
  cursor:pointer;
  padding:0.5rem 1rem;
  border:none;
  background:linear-gradient(135deg,var(--accent),var(--accent-soft));
  color:white;
  border-radius:30px;
  transition:0.3s;
  font-weight:600;
}

.toggle-btn:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow:0 10px 25px rgba(142,68,173,0.4);
}

/* MAIN */
main {
  max-width:1000px;
  margin:auto;
  padding:2rem;
}

/* SECTIONS */
section {
  margin-bottom:3rem;
  background:var(--card);
  padding:2rem;
  border-radius:16px;
  box-shadow:0 5px 20px rgba(142,68,173,0.08);
  opacity:0;
  transform: translateY(40px);
  transition: all 0.8s ease;
}

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

section:hover {
  box-shadow:0 10px 30px rgba(142,68,173,0.15);
}

/* TABS */
.tab-buttons {
  display:flex;
  gap:1rem;
  margin-bottom:1rem;
}

.tab-buttons button {
  padding:0.5rem 1rem;
  border:none;
  border-radius:6px;
  cursor:pointer;
  background:#e0d0e7;
  transition:0.2s;
}

.tab-buttons button:hover {
  transform:scale(1.05);
}

.tab-buttons button.active {
  background:linear-gradient(135deg,var(--accent),var(--accent-soft));
  color:white;
}

.tab-content {
  display:none;
}

.tab-content.active {
  display:block;
}

/* CODE BLOCK */
pre {
  background:#111;
  color:#0f0;
  padding:1rem;
  border-radius:8px;
  overflow-x:auto;
}

/* FOOTER */
footer {
  text-align:center;
  padding:2rem;
  font-size:0.9rem;
  opacity:0.7;
}