body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  padding: 30px;
  display: flex;
  justify-content: center;
  background-color: #121826;
  color: #F9FAFB;
}

.layout {
  display: flex;
  max-width: 1300px;
  width: 100%;
  gap: 20px;
}

.sidebar {
  width: 130px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ad-placeholder {
  background: #1F2937;
  border: 2px dashed #374151;
  width: 100px;
  height: 600px;
  color: #9CA3AF;
  font-size: 0.8em;
  display: flex;
  align-items: center;
  justify-content: center;
}

.container {
  flex: 1;
  background: #1F2937;
  padding: 40px;
  border-radius: 16px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.6);
}

.toggle-dark {
  text-align: right;
  margin-bottom: 20px;
  color: #9CA3AF;
}

h2 {
  text-align: center;
  font-size: 2.2em;
  margin-bottom: 25px;
  color: #F9FAFB;
}

input[type="number"] {
  width: 100%;
  padding: 12px;
  margin-top: 5px;
  border-radius: 8px;
  border: 1px solid #374151;
  background-color: #111827;
  color: #F9FAFB;
  font-size: 1em;
}

.flex-row {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: space-between;
  margin: 25px 0;
  background-color: #111827;
  padding: 20px;
  border: 1px solid #374151;
  border-radius: 12px;
}

.flex-column {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 220px;
}

input[type="checkbox"],
input[type="radio"] {
  margin-right: 8px;
  accent-color: #3B82F6;
}

button {
  width: 100%;
  padding: 15px;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1em;
  color: white;
  cursor: pointer;
  transition: background 0.3s ease;
}

button[name="generate"] {
  background: #2563EB;
}
button[name="generate"]:hover {
  background: #1D4ED8;
}
#copyBtn {
  background: #10B981;
  margin-top: 20px;
}
#copyBtn:hover {
  background: #059669;
}
#clearBtn {
  background: #EF4444;
  margin-top: 15px;
}
#clearBtn:hover {
  background: #DC2626;
}

#result {
  margin-top: 25px;
  padding: 15px;
  font-family: monospace;
  border-radius: 8px;
  font-size: 1.5em;
  font-weight: bold;
  text-align: center;
  color: #F9FAFB;
  background-color: #111827;
  border: 1px solid #374151;
}

#strength {
  text-align: center;
  font-weight: bold;
  margin-top: 12px;
  color: #3B82F6;
  font-size: 1.1em;
}

footer {
  text-align: center;
  margin-top: 40px;
  font-size: 0.9em;
  color: #9CA3AF;
}

body.ultra-dark {
  background-color: #0B0F1A;
  color: #FFFFFF;
}
body.ultra-dark .container,
body.ultra-dark .ad-placeholder {
  background-color: #111;
}
body.ultra-dark #result {
  background-color: #000;
  color: #00FFC6;
  border: 1px solid #00FFC6;
}
body.ultra-dark #strength {
  color: #00FFC6;
}
body.ultra-dark button[name="generate"] {
  background: #00ADB5;
}
body.ultra-dark button[name="generate"]:hover {
  background: #01959A;
}
body.ultra-dark #copyBtn {
  background: #00C48C;
}
body.ultra-dark #copyBtn:hover {
  background: #00A678;
}
body.ultra-dark #clearBtn {
  background: #FF4C4C;
}
body.ultra-dark #clearBtn:hover {
  background: #CC3B3B;
}