* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    background-color: #121212;
    color: #E0E0E0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    padding: 20px;
}
header {
    text-align: center;
    margin-bottom: 30px;
}
h1 {
    color: #BB86FC;
    font-size: 2.2rem;
}
h2, h3 {
    color: #03DAC6;
}
.avatar svg {
    margin: 10px auto;
    display: inline-block;
}
.subtitle {
    color: #AAAAAA;
    font-size: 1rem;
}
.container {
    max-width: 1100px;
    margin: 0 auto;
    background-color: #1E1E1E;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.5);
}
.labs-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin: 25px 0;
}
.lab-card {
    flex: 1 1 220px;
    background: #2C2C2C;
    border-radius: 12px;
    padding: 20px;
    text-decoration: none;
    color: #E0E0E0;
    transition: transform 0.2s, background 0.2s;
    border-left: 4px solid #BB86FC;
}
.lab-card:hover {
    background: #3A3A3A;
    transform: translateY(-3px);
}
.lab-num {
    font-size: 0.8rem;
    background: #BB86FC;
    color: #121212;
    padding: 3px 8px;
    border-radius: 20px;
    font-weight: bold;
}
.lab-card h3 {
    margin: 10px 0 5px;
    color: #03DAC6;
}
.lab-card p {
    font-size: 0.9rem;
    color: #AAAAAA;
}
.extra-labs {
    margin-top: 30px;
    padding-top: 15px;
    border-top: 1px solid #333;
    text-align: center;
}
.extra-labs a {
    color: #BB86FC;
    text-decoration: none;
    margin: 0 12px;
    font-size: 0.9rem;
}
.extra-labs a:hover {
    text-decoration: underline;
}
footer {
    text-align: center;
    margin-top: 30px;
    font-size: 0.8rem;
    color: #666;
}
input, textarea, select {
    background-color: #2C2C2C;
    border: 1px solid #444;
    color: #E0E0E0;
    padding: 8px 12px;
    border-radius: 6px;
    font-family: inherit;
    width: 100%;
    max-width: 300px;
}
button, .btn, input[type="submit"] {
    background-color: #BB86FC;
    color: #121212;
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: bold;
    transition: background 0.2s;
}
button:hover, .btn:hover, input[type="submit"]:hover {
    background-color: #9B5FCB;
}
.result {
    background: #2C2C2C;
    padding: 15px;
    border-radius: 8px;
    margin-top: 20px;
    white-space: pre-wrap;
    font-family: monospace;
}
.back-btn {
    display: inline-block;
    background: #BB86FC;
    color: #121212;
    padding: 5px 12px;
    text-decoration: none;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-bottom: 15px;
}
.input-field {
    margin-bottom: 15px;
}
.input-field label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}
.section-title {
    font-weight: bold;
    margin: 15px 0 10px;
}
.bits-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 15px;
}
.bit-input {
    display: flex;
    flex-direction: column;
    align-items: center;
}
.bit-input input {
    width: 60px;
    text-align: center;
}
.btn-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin: 15px 0;
}
.probs-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-bottom: 15px;
}
@media (max-width: 500px) {
    .probs-grid { grid-template-columns: repeat(2, 1fr); }
}
.groups {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin: 20px 0;
}
@media (max-width: 600px) {
    .groups { grid-template-columns: 1fr; }
}
.group-box {
    background: #2C2C2C;
    padding: 15px;
    border-radius: 10px;
}
.freq-list {
    max-height: 250px;
    overflow-y: auto;
    font-family: monospace;
}
.freq-row {
    display: flex;
    justify-content: space-between;
    padding: 4px 0;
    border-bottom: 1px solid #444;
}
.generated-text {
    background: #2C2C2C;
    padding: 12px;
    border-radius: 8px;
    word-wrap: break-word;
}
.formula {
    text-align: center;
    font-size: 28px;
    background: #2C2C2C;
    padding: 15px;
    border-radius: 10px;
    margin: 20px 0;
}