/* RESET */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", sans-serif;
}

/* LIGHT MODE (DEFAULT) */
body {
  background: #f4f7fb;
  color: #1f2937;
  transition: 0.3s;
}

/* HEADER */
header {
  background: linear-gradient(90deg, #1e3a8a, #2563eb);
  color: white;
  padding: 20px;
  text-align: center;
  position: relative;
}

#darkToggle {
  position: absolute;
  left: 20px;
  top: 20px;
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
}

/* LAYOUT */
.container {
  display: flex;
  max-width: 1200px;
  margin: 30px auto;
  gap: 20px;
}

/* SIDEBAR */
nav {
  width: 220px;
  background: white;
  padding: 20px;
  border-radius: 12px;
}

nav h3 {
  margin-bottom: 10px;
}

nav ul {
  list-style: none;
}

nav button {
  width: 100%;
  margin-bottom: 8px;
  padding: 8px;
  border: none;
  border-radius: 6px;
  background: #e0e7ff;
  cursor: pointer;
}

nav button:hover {
  background: #c7d2fe;
}

/* KONTEN */
main {
  flex: 1;
}

section {
  display: none;
  background: white;
  padding: 25px;
  border-radius: 12px;
  animation: fade 0.3s;
}

section.active {
  display: block;
}

@keyframes fade {
  from { opacity: 0; transform: translateY(5px); }
  to { opacity: 1; transform: translateY(0); }
}

.download {
  display: inline-block;
  margin: 15px 0;
  padding: 10px 15px;
  background: #1e3a8a;
  color: white;
  border-radius: 6px;
  text-decoration: none;
}

.nav-control {
  display: flex;
  justify-content: space-between;
  margin-top: 10px;
}

.nav-btn {
  padding: 6px 12px;
  border: none;
  border-radius: 6px;
  background: #2563eb;
  color: white;
  cursor: pointer;
}

/* FOOTER */
footer {
  background: #1e3a8a;
  color: white;
  text-align: center;
  padding: 15px;
  margin-top: 40px;
}

/* 🌙 DARK MODE */
body.dark {
  background: #0f0a1f;
  color: #e5e7eb;
}

body.dark header {
  background: linear-gradient(90deg, #4c1d95, #6d28d9);
}

body.dark nav,
body.dark section {
  background: #1a1333;
}

body.dark nav button {
  background: #2e1065;
  color: white;
}

body.dark nav button:hover {
  background: #4c1d95;
}

body.dark .download,
body.dark .nav-btn {
  background: #6d28d9;
}

body.dark footer {
  background: #4c1d95;
}