/* CSS Variables for Light/Dark Themes */
:root {
  --bg-color: #f5f7fa;
  --text-color: #222222;
  --primary-color: #0066ff;
  --secondary-color: #555555;
  --card-bg: #ffffff;
  --card-shadow: rgba(0, 0, 0, 0.1);
  --accent-color: #ff6600;
}
[data-theme="dark"] {
  --bg-color: #121212;
  --text-color: #e0e0e0;
  --primary-color: #4a90e2;
  --secondary-color: #bbbbbb;
  --card-bg: #1e1e1e;
  --card-shadow: rgba(0, 0, 0, 0.5);
  --accent-color: #ff9500;
}

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

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.2s;
}
a:hover {
  color: var(--accent-color);
}

.top-nav, .bottom-nav {
  background: var(--card-bg);
  box-shadow: 0 2px 4px var(--card-shadow);
  padding: 0.8rem 1.5rem;
}
.top-nav ul, .bottom-nav ul {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  justify-content: center;
}
.top-nav .nav-link.active {
  font-weight: 600;
  border-bottom: 2px solid var(--primary-color);
}

.theme-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
}

main {
  flex: 1;
  max-width: 1200px;
  margin: 2rem auto;
  width: 90%;
}

.section {
  margin-bottom: 3rem;
}

.generator-container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  background: var(--card-bg);
  padding: 1.5rem;
  border-radius: 8px;
  box-shadow: 0 2px 8px var(--card-shadow);
}

.output-box {
  font-family: 'Courier New', monospace;
  font-size: 1.2rem;
  background: #e8f0fe;
  padding: 0.8rem;
  border-radius: 4px;
  word-break: break-all;
  min-height: 2.5rem;
}
[data-theme="dark"] .output-box { background: #2c3e50; }

.controls label {
  display: block;
  margin-top: 0.5rem;
}
.controls input[type="range"] {
  width: 100%;
}
.checkboxes {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 0.5rem;
}
.checkboxes label {
  flex: 1 1 45%;
}

details.advanced-options {
  margin-top: 0.8rem;
  background: #f0f4ff;
  padding: 0.8rem;
  border-radius: 4px;
}
[data-theme="dark"] details.advanced-options { background: #2a2f3a; }

.action-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 0.8rem;
}
.action-buttons button {
  flex: 1 1 auto;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}
button.primary { background: var(--primary-color); color: #fff; }
button.secondary { background: var(--secondary-color); color: #fff; }
button:disabled { opacity: 0.5; cursor: not-allowed; }
button:hover:not(:disabled) { transform: translateY(-2px); }

.strength-meter {
  margin-top: 0.8rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
#strength-meter {
  width: 150px;
  height: 12px;
}

/* Tabs */
.tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}
.tab-link {
  flex: 1;
  padding: 0.5rem;
  background: var(--secondary-color);
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}
.tab-link.active { background: var(--primary-color); }
.tab-content { padding: 0.8rem; background: var(--card-bg); border-radius: 4px; }

/* Tools Hub Grid */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}
.card {
  background: var(--card-bg);
  padding: 1rem;
  border-radius: 8px;
  text-align: center;
  box-shadow: 0 2px 6px var(--card-shadow);
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 12px var(--card-shadow);
}
.card .icon { font-size: 2rem; margin-bottom: 0.5rem; }

/* FAQ */
dl { display: grid; gap: 0.5rem; }
dt { font-weight: 600; }
dd { margin-left: 1rem; }

/* Responsive */
@media (max-width: 600px) {
  .top-nav ul, .bottom-nav ul { flex-direction: column; align-items: center; }
  .grid { grid-template-columns: 1fr; }
}