.smn-train-card {
    background: #1a1a1a;
    color: #ffffff;
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    max-width: 550px;
    margin: 20px auto;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    border: 1px solid #2d2d2d;
}
.smn-card-header h3 {
    margin: 0 0 20px 0;
    text-align: center;
    color: #00ffcc;
    font-size: 22px;
    font-weight: 700;
}
.smn-tabs {
    display: flex;
    border-bottom: 2px solid #2d2d2d;
    margin-bottom: 20px;
}
.smn-tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: #888888;
    padding: 12px;
    font-size: 16px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}
.smn-tab-btn.active, .smn-tab-btn:hover {
    color: #00ffcc;
    border-bottom: 3px solid #00ffcc;
    outline: none;
}
.smn-tab-content {
    display: none;
}
.smn-tab-content.active {
    display: block;
}
.smn-train-card input[type="number"],
.smn-train-card input[type="text"] {
    width: 100%;
    padding: 14px;
    background: #2b2b2b;
    border: 1px solid #3d3d3d;
    color: #ffffff;
    border-radius: 6px;
    margin-bottom: 15px;
    font-size: 16px;
    box-sizing: border-box;
}
.smn-train-card input:focus {
    border-color: #00ffcc;
    outline: none;
}
.smn-btn-primary {
    width: 100%;
    padding: 14px;
    background: #00ffcc;
    color: #111111;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.2s ease;
}
.smn-btn-primary:hover {
    background: #00ccaa;
}
.smn-result-box {
    margin-top: 20px;
    padding: 15px;
    background: #222222;
    border-radius: 6px;
    border-left: 4px solid #00ffcc;
    font-size: 14px;
    line-height: 1.6;
    display: none;
}
.smn-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}
.smn-table th, .smn-table td {
    padding: 8px;
    text-align: left;
    border-bottom: 1px solid #333;
}
.smn-table th {
    color: #00ffcc;
}